2 * Copyright (c) 2016-2020 Netflix, Inc.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 #include "opt_inet6.h"
32 #include "opt_ipsec.h"
33 #include "opt_tcpdebug.h"
34 #include "opt_ratelimit.h"
35 #include "opt_kern_tls.h"
36 #include <sys/param.h>
38 #include <sys/module.h>
39 #include <sys/kernel.h>
41 #include <sys/hhook.h>
44 #include <sys/malloc.h>
46 #include <sys/mutex.h>
48 #include <sys/proc.h> /* for proc0 declaration */
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/sysctl.h>
52 #include <sys/systm.h>
54 #include <sys/qmath.h>
56 #include <sys/stats.h> /* Must come after qmath.h and tree.h */
60 #include <sys/refcount.h>
61 #include <sys/queue.h>
62 #include <sys/tim_filter.h>
64 #include <sys/kthread.h>
65 #include <sys/kern_prefetch.h>
66 #include <sys/protosw.h>
68 #include <sys/sched.h>
69 #include <machine/cpu.h>
73 #include <net/route.h>
74 #include <net/route/nhop.h>
77 #define TCPSTATES /* for logging */
79 #include <netinet/in.h>
80 #include <netinet/in_kdtrace.h>
81 #include <netinet/in_pcb.h>
82 #include <netinet/ip.h>
83 #include <netinet/ip_icmp.h> /* required for icmp_var.h */
84 #include <netinet/icmp_var.h> /* for ICMP_BANDLIM */
85 #include <netinet/ip_var.h>
86 #include <netinet/ip6.h>
87 #include <netinet6/in6_pcb.h>
88 #include <netinet6/ip6_var.h>
89 #include <netinet/tcp.h>
91 #include <netinet/tcp_fsm.h>
92 #include <netinet/tcp_log_buf.h>
93 #include <netinet/tcp_seq.h>
94 #include <netinet/tcp_timer.h>
95 #include <netinet/tcp_var.h>
96 #include <netinet/tcp_syncache.h>
97 #include <netinet/tcp_hpts.h>
98 #include <netinet/tcp_ratelimit.h>
99 #include <netinet/tcp_accounting.h>
100 #include <netinet/tcpip.h>
101 #include <netinet/cc/cc.h>
102 #include <netinet/cc/cc_newreno.h>
103 #include <netinet/tcp_fastopen.h>
104 #include <netinet/tcp_lro.h>
105 #ifdef NETFLIX_SHARED_CWND
106 #include <netinet/tcp_shared_cwnd.h>
109 #include <netinet/tcp_debug.h>
110 #endif /* TCPDEBUG */
112 #include <netinet/tcp_offload.h>
115 #include <netinet6/tcp6_var.h>
117 #include <netinet/tcp_ecn.h>
119 #include <netipsec/ipsec_support.h>
121 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
122 #include <netipsec/ipsec.h>
123 #include <netipsec/ipsec6.h>
126 #include <netinet/udp.h>
127 #include <netinet/udp_var.h>
128 #include <machine/in_cksum.h>
131 #include <security/mac/mac_framework.h>
133 #include "sack_filter.h"
134 #include "tcp_rack.h"
135 #include "rack_bbr_common.h"
137 uma_zone_t rack_zone;
138 uma_zone_t rack_pcb_zone;
141 #define TICKS2SBT(__t) (tick_sbt * ((sbintime_t)(__t)))
144 VNET_DECLARE(uint32_t, newreno_beta);
145 VNET_DECLARE(uint32_t, newreno_beta_ecn);
146 #define V_newreno_beta VNET(newreno_beta)
147 #define V_newreno_beta_ecn VNET(newreno_beta_ecn)
150 MALLOC_DEFINE(M_TCPFSB, "tcp_fsb", "TCP fast send block");
151 MALLOC_DEFINE(M_TCPDO, "tcp_do", "TCP deferred options");
153 struct sysctl_ctx_list rack_sysctl_ctx;
154 struct sysctl_oid *rack_sysctl_root;
160 * The RACK module incorporates a number of
161 * TCP ideas that have been put out into the IETF
162 * over the last few years:
163 * - Matt Mathis's Rate Halving which slowly drops
164 * the congestion window so that the ack clock can
165 * be maintained during a recovery.
166 * - Yuchung Cheng's RACK TCP (for which its named) that
167 * will stop us using the number of dup acks and instead
168 * use time as the gage of when we retransmit.
169 * - Reorder Detection of RFC4737 and the Tail-Loss probe draft
170 * of Dukkipati et.al.
171 * RACK depends on SACK, so if an endpoint arrives that
172 * cannot do SACK the state machine below will shuttle the
173 * connection back to using the "default" TCP stack that is
176 * To implement RACK the original TCP stack was first decomposed
177 * into a functional state machine with individual states
178 * for each of the possible TCP connection states. The do_segment
179 * functions role in life is to mandate the connection supports SACK
180 * initially and then assure that the RACK state matches the conenction
181 * state before calling the states do_segment function. Each
182 * state is simplified due to the fact that the original do_segment
183 * has been decomposed and we *know* what state we are in (no
184 * switches on the state) and all tests for SACK are gone. This
185 * greatly simplifies what each state does.
187 * TCP output is also over-written with a new version since it
188 * must maintain the new rack scoreboard.
191 static int32_t rack_tlp_thresh = 1;
192 static int32_t rack_tlp_limit = 2; /* No more than 2 TLPs w-out new data */
193 static int32_t rack_tlp_use_greater = 1;
194 static int32_t rack_reorder_thresh = 2;
195 static int32_t rack_reorder_fade = 60000000; /* 0 - never fade, def 60,000,000
197 static uint8_t rack_req_measurements = 1;
198 /* Attack threshold detections */
199 static uint32_t rack_highest_sack_thresh_seen = 0;
200 static uint32_t rack_highest_move_thresh_seen = 0;
201 static int32_t rack_enable_hw_pacing = 0; /* Due to CCSP keep it off by default */
202 static int32_t rack_hw_pace_extra_slots = 2; /* 2 extra MSS time betweens */
203 static int32_t rack_hw_rate_caps = 1; /* 1; */
204 static int32_t rack_hw_rate_min = 0; /* 1500000;*/
205 static int32_t rack_hw_rate_to_low = 0; /* 1200000; */
206 static int32_t rack_hw_up_only = 1;
207 static int32_t rack_stats_gets_ms_rtt = 1;
208 static int32_t rack_prr_addbackmax = 2;
209 static int32_t rack_do_hystart = 0;
210 static int32_t rack_apply_rtt_with_reduced_conf = 0;
212 static int32_t rack_pkt_delay = 1000;
213 static int32_t rack_send_a_lot_in_prr = 1;
214 static int32_t rack_min_to = 1000; /* Number of microsecond min timeout */
215 static int32_t rack_verbose_logging = 0;
216 static int32_t rack_ignore_data_after_close = 1;
217 static int32_t rack_enable_shared_cwnd = 1;
218 static int32_t rack_use_cmp_acks = 1;
219 static int32_t rack_use_fsb = 1;
220 static int32_t rack_use_rfo = 1;
221 static int32_t rack_use_rsm_rfo = 1;
222 static int32_t rack_max_abc_post_recovery = 2;
223 static int32_t rack_client_low_buf = 0;
224 static int32_t rack_dsack_std_based = 0x3; /* bit field bit 1 sets rc_rack_tmr_std_based and bit 2 sets rc_rack_use_dsack */
225 #ifdef TCP_ACCOUNTING
226 static int32_t rack_tcp_accounting = 0;
228 static int32_t rack_limits_scwnd = 1;
229 static int32_t rack_enable_mqueue_for_nonpaced = 0;
230 static int32_t rack_disable_prr = 0;
231 static int32_t use_rack_rr = 1;
232 static int32_t rack_non_rxt_use_cr = 0; /* does a non-rxt in recovery use the configured rate (ss/ca)? */
233 static int32_t rack_persist_min = 250000; /* 250usec */
234 static int32_t rack_persist_max = 2000000; /* 2 Second in usec's */
235 static int32_t rack_sack_not_required = 1; /* set to one to allow non-sack to use rack */
236 static int32_t rack_default_init_window = 0; /* Use system default */
237 static int32_t rack_limit_time_with_srtt = 0;
238 static int32_t rack_autosndbuf_inc = 20; /* In percentage form */
239 static int32_t rack_enobuf_hw_boost_mult = 2; /* How many times the hw rate we boost slot using time_between */
240 static int32_t rack_enobuf_hw_max = 12000; /* 12 ms in usecs */
241 static int32_t rack_enobuf_hw_min = 10000; /* 10 ms in usecs */
242 static int32_t rack_hw_rwnd_factor = 2; /* How many max_segs the rwnd must be before we hold off sending */
245 * Currently regular tcp has a rto_min of 30ms
246 * the backoff goes 12 times so that ends up
247 * being a total of 122.850 seconds before a
248 * connection is killed.
250 static uint32_t rack_def_data_window = 20;
251 static uint32_t rack_goal_bdp = 2;
252 static uint32_t rack_min_srtts = 1;
253 static uint32_t rack_min_measure_usec = 0;
254 static int32_t rack_tlp_min = 10000; /* 10ms */
255 static int32_t rack_rto_min = 30000; /* 30,000 usec same as main freebsd */
256 static int32_t rack_rto_max = 4000000; /* 4 seconds in usec's */
257 static const int32_t rack_free_cache = 2;
258 static int32_t rack_hptsi_segments = 40;
259 static int32_t rack_rate_sample_method = USE_RTT_LOW;
260 static int32_t rack_pace_every_seg = 0;
261 static int32_t rack_delayed_ack_time = 40000; /* 40ms in usecs */
262 static int32_t rack_slot_reduction = 4;
263 static int32_t rack_wma_divisor = 8; /* For WMA calculation */
264 static int32_t rack_cwnd_block_ends_measure = 0;
265 static int32_t rack_rwnd_block_ends_measure = 0;
266 static int32_t rack_def_profile = 0;
268 static int32_t rack_lower_cwnd_at_tlp = 0;
269 static int32_t rack_limited_retran = 0;
270 static int32_t rack_always_send_oldest = 0;
271 static int32_t rack_tlp_threshold_use = TLP_USE_TWO_ONE;
273 static uint16_t rack_per_of_gp_ss = 250; /* 250 % slow-start */
274 static uint16_t rack_per_of_gp_ca = 200; /* 200 % congestion-avoidance */
275 static uint16_t rack_per_of_gp_rec = 200; /* 200 % of bw */
278 static uint16_t rack_per_of_gp_probertt = 60; /* 60% of bw */
279 static uint16_t rack_per_of_gp_lowthresh = 40; /* 40% is bottom */
280 static uint16_t rack_per_of_gp_probertt_reduce = 10; /* 10% reduction */
281 static uint16_t rack_atexit_prtt_hbp = 130; /* Clamp to 130% on exit prtt if highly buffered path */
282 static uint16_t rack_atexit_prtt = 130; /* Clamp to 100% on exit prtt if non highly buffered path */
284 static uint32_t rack_max_drain_wait = 2; /* How man gp srtt's before we give up draining */
285 static uint32_t rack_must_drain = 1; /* How many GP srtt's we *must* wait */
286 static uint32_t rack_probertt_use_min_rtt_entry = 1; /* Use the min to calculate the goal else gp_srtt */
287 static uint32_t rack_probertt_use_min_rtt_exit = 0;
288 static uint32_t rack_probe_rtt_sets_cwnd = 0;
289 static uint32_t rack_probe_rtt_safety_val = 2000000; /* No more than 2 sec in probe-rtt */
290 static uint32_t rack_time_between_probertt = 9600000; /* 9.6 sec in usecs */
291 static uint32_t rack_probertt_gpsrtt_cnt_mul = 0; /* How many srtt periods does probe-rtt last top fraction */
292 static uint32_t rack_probertt_gpsrtt_cnt_div = 0; /* How many srtt periods does probe-rtt last bottom fraction */
293 static uint32_t rack_min_probertt_hold = 40000; /* Equal to delayed ack time */
294 static uint32_t rack_probertt_filter_life = 10000000;
295 static uint32_t rack_probertt_lower_within = 10;
296 static uint32_t rack_min_rtt_movement = 250000; /* Must move at least 250ms (in microseconds) to count as a lowering */
297 static int32_t rack_pace_one_seg = 0; /* Shall we pace for less than 1.4Meg 1MSS at a time */
298 static int32_t rack_probertt_clear_is = 1;
299 static int32_t rack_max_drain_hbp = 1; /* Extra drain times gpsrtt for highly buffered paths */
300 static int32_t rack_hbp_thresh = 3; /* what is the divisor max_rtt/min_rtt to decided a hbp */
303 static int32_t rack_max_per_above = 30; /* When we go to increment stop if above 100+this% */
305 /* Timely information */
306 /* Combine these two gives the range of 'no change' to bw */
307 /* ie the up/down provide the upper and lower bound */
308 static int32_t rack_gp_per_bw_mul_up = 2; /* 2% */
309 static int32_t rack_gp_per_bw_mul_down = 4; /* 4% */
310 static int32_t rack_gp_rtt_maxmul = 3; /* 3 x maxmin */
311 static int32_t rack_gp_rtt_minmul = 1; /* minrtt + (minrtt/mindiv) is lower rtt */
312 static int32_t rack_gp_rtt_mindiv = 4; /* minrtt + (minrtt * minmul/mindiv) is lower rtt */
313 static int32_t rack_gp_decrease_per = 20; /* 20% decrease in multiplier */
314 static int32_t rack_gp_increase_per = 2; /* 2% increase in multiplier */
315 static int32_t rack_per_lower_bound = 50; /* Don't allow to drop below this multiplier */
316 static int32_t rack_per_upper_bound_ss = 0; /* Don't allow SS to grow above this */
317 static int32_t rack_per_upper_bound_ca = 0; /* Don't allow CA to grow above this */
318 static int32_t rack_do_dyn_mul = 0; /* Are the rack gp multipliers dynamic */
319 static int32_t rack_gp_no_rec_chg = 1; /* Prohibit recovery from reducing it's multiplier */
320 static int32_t rack_timely_dec_clear = 6; /* Do we clear decrement count at a value (6)? */
321 static int32_t rack_timely_max_push_rise = 3; /* One round of pushing */
322 static int32_t rack_timely_max_push_drop = 3; /* Three round of pushing */
323 static int32_t rack_timely_min_segs = 4; /* 4 segment minimum */
324 static int32_t rack_use_max_for_nobackoff = 0;
325 static int32_t rack_timely_int_timely_only = 0; /* do interim timely's only use the timely algo (no b/w changes)? */
326 static int32_t rack_timely_no_stopping = 0;
327 static int32_t rack_down_raise_thresh = 100;
328 static int32_t rack_req_segs = 1;
329 static uint64_t rack_bw_rate_cap = 0;
330 static uint32_t rack_trace_point_config = 0;
331 static uint32_t rack_trace_point_bb_mode = 4;
332 static int32_t rack_trace_point_count = 0;
335 /* Weird delayed ack mode */
336 static int32_t rack_use_imac_dack = 0;
337 /* Rack specific counters */
338 counter_u64_t rack_saw_enobuf;
339 counter_u64_t rack_saw_enobuf_hw;
340 counter_u64_t rack_saw_enetunreach;
341 counter_u64_t rack_persists_sends;
342 counter_u64_t rack_persists_acks;
343 counter_u64_t rack_persists_loss;
344 counter_u64_t rack_persists_lost_ends;
346 counter_u64_t rack_adjust_map_bw;
348 /* Tail loss probe counters */
349 counter_u64_t rack_tlp_tot;
350 counter_u64_t rack_tlp_newdata;
351 counter_u64_t rack_tlp_retran;
352 counter_u64_t rack_tlp_retran_bytes;
353 counter_u64_t rack_to_tot;
354 counter_u64_t rack_hot_alloc;
355 counter_u64_t rack_to_alloc;
356 counter_u64_t rack_to_alloc_hard;
357 counter_u64_t rack_to_alloc_emerg;
358 counter_u64_t rack_to_alloc_limited;
359 counter_u64_t rack_alloc_limited_conns;
360 counter_u64_t rack_split_limited;
362 counter_u64_t rack_multi_single_eq;
363 counter_u64_t rack_proc_non_comp_ack;
365 counter_u64_t rack_fto_send;
366 counter_u64_t rack_fto_rsm_send;
367 counter_u64_t rack_nfto_resend;
368 counter_u64_t rack_non_fto_send;
369 counter_u64_t rack_extended_rfo;
371 counter_u64_t rack_sack_proc_all;
372 counter_u64_t rack_sack_proc_short;
373 counter_u64_t rack_sack_proc_restart;
374 counter_u64_t rack_sack_attacks_detected;
375 counter_u64_t rack_sack_attacks_reversed;
376 counter_u64_t rack_sack_used_next_merge;
377 counter_u64_t rack_sack_splits;
378 counter_u64_t rack_sack_used_prev_merge;
379 counter_u64_t rack_sack_skipped_acked;
380 counter_u64_t rack_ack_total;
381 counter_u64_t rack_express_sack;
382 counter_u64_t rack_sack_total;
383 counter_u64_t rack_move_none;
384 counter_u64_t rack_move_some;
386 counter_u64_t rack_input_idle_reduces;
387 counter_u64_t rack_collapsed_win;
388 counter_u64_t rack_collapsed_win_seen;
389 counter_u64_t rack_collapsed_win_rxt;
390 counter_u64_t rack_collapsed_win_rxt_bytes;
391 counter_u64_t rack_try_scwnd;
392 counter_u64_t rack_hw_pace_init_fail;
393 counter_u64_t rack_hw_pace_lost;
395 counter_u64_t rack_out_size[TCP_MSS_ACCT_SIZE];
396 counter_u64_t rack_opts_arry[RACK_OPTS_SIZE];
399 #define RACK_REXMTVAL(tp) max(rack_rto_min, ((tp)->t_srtt + ((tp)->t_rttvar << 2)))
401 #define RACK_TCPT_RANGESET(tv, value, tvmin, tvmax, slop) do { \
402 (tv) = (value) + slop; \
403 if ((u_long)(tv) < (u_long)(tvmin)) \
405 if ((u_long)(tv) > (u_long)(tvmax)) \
410 rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, int event, int line);
413 rack_process_ack(struct mbuf *m, struct tcphdr *th,
414 struct socket *so, struct tcpcb *tp, struct tcpopt *to,
415 uint32_t tiwin, int32_t tlen, int32_t * ofia, int32_t thflags, int32_t * ret_val);
417 rack_process_data(struct mbuf *m, struct tcphdr *th,
418 struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
419 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt);
421 rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack,
422 uint32_t th_ack, uint16_t nsegs, uint16_t type, int32_t recovery);
423 static struct rack_sendmap *rack_alloc(struct tcp_rack *rack);
424 static struct rack_sendmap *rack_alloc_limit(struct tcp_rack *rack,
426 static struct rack_sendmap *
427 rack_check_recovery_mode(struct tcpcb *tp,
430 rack_cong_signal(struct tcpcb *tp,
431 uint32_t type, uint32_t ack, int );
432 static void rack_counter_destroy(void);
434 rack_ctloutput(struct inpcb *inp, struct sockopt *sopt);
435 static int32_t rack_ctor(void *mem, int32_t size, void *arg, int32_t how);
437 rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack, uint32_t line, uint64_t *fill_override);
439 rack_do_segment(struct mbuf *m, struct tcphdr *th,
440 struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
442 static void rack_dtor(void *mem, int32_t size, void *arg);
444 rack_log_alt_to_to_cancel(struct tcp_rack *rack,
445 uint32_t flex1, uint32_t flex2,
446 uint32_t flex3, uint32_t flex4,
447 uint32_t flex5, uint32_t flex6,
448 uint16_t flex7, uint8_t mod);
451 rack_log_pacing_delay_calc(struct tcp_rack *rack, uint32_t len, uint32_t slot,
452 uint64_t bw_est, uint64_t bw, uint64_t len_time, int method, int line,
453 struct rack_sendmap *rsm, uint8_t quality);
454 static struct rack_sendmap *
455 rack_find_high_nonack(struct tcp_rack *rack,
456 struct rack_sendmap *rsm);
457 static struct rack_sendmap *rack_find_lowest_rsm(struct tcp_rack *rack);
458 static void rack_free(struct tcp_rack *rack, struct rack_sendmap *rsm);
459 static void rack_fini(struct tcpcb *tp, int32_t tcb_is_purged);
460 static int rack_get_sockopt(struct inpcb *inp, struct sockopt *sopt);
462 rack_do_goodput_measurement(struct tcpcb *tp, struct tcp_rack *rack,
463 tcp_seq th_ack, int line, uint8_t quality);
465 rack_get_pacing_len(struct tcp_rack *rack, uint64_t bw, uint32_t mss);
466 static int32_t rack_handoff_ok(struct tcpcb *tp);
467 static int32_t rack_init(struct tcpcb *tp);
468 static void rack_init_sysctls(void);
470 rack_log_ack(struct tcpcb *tp, struct tcpopt *to,
471 struct tcphdr *th, int entered_rec, int dup_ack_struck);
473 rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len,
474 uint32_t seq_out, uint16_t th_flags, int32_t err, uint64_t ts,
475 struct rack_sendmap *hintrsm, uint16_t add_flags, struct mbuf *s_mb, uint32_t s_moff, int hw_tls);
478 rack_log_sack_passed(struct tcpcb *tp, struct tcp_rack *rack,
479 struct rack_sendmap *rsm);
480 static void rack_log_to_event(struct tcp_rack *rack, int32_t to_num, struct rack_sendmap *rsm);
481 static int32_t rack_output(struct tcpcb *tp);
484 rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack,
485 struct sackblk *sack, struct tcpopt *to, struct rack_sendmap **prsm,
486 uint32_t cts, int *moved_two);
487 static void rack_post_recovery(struct tcpcb *tp, uint32_t th_seq);
488 static void rack_remxt_tmr(struct tcpcb *tp);
489 static int rack_set_sockopt(struct inpcb *inp, struct sockopt *sopt);
490 static void rack_set_state(struct tcpcb *tp, struct tcp_rack *rack);
491 static int32_t rack_stopall(struct tcpcb *tp);
493 rack_timer_activate(struct tcpcb *tp, uint32_t timer_type,
495 static int32_t rack_timer_active(struct tcpcb *tp, uint32_t timer_type);
496 static void rack_timer_cancel(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int line);
497 static void rack_timer_stop(struct tcpcb *tp, uint32_t timer_type);
499 rack_update_entry(struct tcpcb *tp, struct tcp_rack *rack,
500 struct rack_sendmap *rsm, uint64_t ts, int32_t * lenp, uint16_t add_flag);
502 rack_update_rsm(struct tcpcb *tp, struct tcp_rack *rack,
503 struct rack_sendmap *rsm, uint64_t ts, uint16_t add_flag);
505 rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack,
506 struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, tcp_seq th_ack);
507 static int32_t tcp_addrack(module_t mod, int32_t type, void *data);
509 rack_do_close_wait(struct mbuf *m, struct tcphdr *th,
510 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
511 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
513 rack_do_closing(struct mbuf *m, struct tcphdr *th,
514 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
515 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
517 rack_do_established(struct mbuf *m, struct tcphdr *th,
518 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
519 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
521 rack_do_fastnewdata(struct mbuf *m, struct tcphdr *th,
522 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
523 int32_t tlen, uint32_t tiwin, int32_t nxt_pkt, uint8_t iptos);
525 rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th,
526 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
527 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
529 rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th,
530 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
531 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
533 rack_do_lastack(struct mbuf *m, struct tcphdr *th,
534 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
535 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
537 rack_do_syn_recv(struct mbuf *m, struct tcphdr *th,
538 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
539 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
541 rack_do_syn_sent(struct mbuf *m, struct tcphdr *th,
542 struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen,
543 int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos);
544 struct rack_sendmap *
545 tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack,
547 static void tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt,
548 uint32_t len, uint32_t us_tim, int confidence, struct rack_sendmap *rsm, uint16_t rtrcnt);
550 tcp_rack_partialack(struct tcpcb *tp);
552 rack_set_profile(struct tcp_rack *rack, int prof);
554 rack_apply_deferred_options(struct tcp_rack *rack);
556 int32_t rack_clear_counter=0;
559 rack_trace_point(struct tcp_rack *rack, int num)
561 if (((rack_trace_point_config == num) ||
562 (rack_trace_point_config = 0xffffffff)) &&
563 (rack_trace_point_bb_mode != 0) &&
564 (rack_trace_point_count > 0) &&
565 (rack->rc_tp->t_logstate == 0)) {
567 res = atomic_fetchadd_int(&rack_trace_point_count, -1);
569 rack->rc_tp->t_logstate = rack_trace_point_bb_mode;
571 /* Loss a race assure its zero now */
572 rack_trace_point_count = 0;
578 rack_set_cc_pacing(struct tcp_rack *rack)
581 struct cc_newreno_opts opt;
582 struct newreno old, *ptr;
586 if (rack->rc_pacing_cc_set)
590 if (tp->t_cc == NULL) {
594 rack->rc_pacing_cc_set = 1;
595 if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0) {
596 /* Not new-reno we can't play games with beta! */
599 ptr = ((struct newreno *)tp->t_ccv.cc_data);
600 if (CC_ALGO(tp)->ctl_output == NULL) {
601 /* Huh, why does new_reno no longer have a set function? */
605 /* Just the default values */
606 old.beta = V_newreno_beta_ecn;
607 old.beta_ecn = V_newreno_beta_ecn;
608 old.newreno_flags = 0;
610 old.beta = ptr->beta;
611 old.beta_ecn = ptr->beta_ecn;
612 old.newreno_flags = ptr->newreno_flags;
614 sopt.sopt_valsize = sizeof(struct cc_newreno_opts);
615 sopt.sopt_dir = SOPT_SET;
616 opt.name = CC_NEWRENO_BETA;
617 opt.val = rack->r_ctl.rc_saved_beta.beta;
618 error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
623 * Hack alert we need to set in our newreno_flags
624 * so that Abe behavior is also applied.
626 ((struct newreno *)tp->t_ccv.cc_data)->newreno_flags |= CC_NEWRENO_BETA_ECN_ENABLED;
627 opt.name = CC_NEWRENO_BETA_ECN;
628 opt.val = rack->r_ctl.rc_saved_beta.beta_ecn;
629 error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
633 /* Save off the original values for restoral */
634 memcpy(&rack->r_ctl.rc_saved_beta, &old, sizeof(struct newreno));
636 if (rack_verbose_logging && (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
637 union tcp_log_stackspecific log;
640 ptr = ((struct newreno *)tp->t_ccv.cc_data);
641 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
642 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
644 log.u_bbr.flex1 = ptr->beta;
645 log.u_bbr.flex2 = ptr->beta_ecn;
646 log.u_bbr.flex3 = ptr->newreno_flags;
648 log.u_bbr.flex4 = rack->r_ctl.rc_saved_beta.beta;
649 log.u_bbr.flex5 = rack->r_ctl.rc_saved_beta.beta_ecn;
650 log.u_bbr.flex6 = rack->r_ctl.rc_saved_beta.newreno_flags;
651 log.u_bbr.flex7 = rack->gp_ready;
652 log.u_bbr.flex7 <<= 1;
653 log.u_bbr.flex7 |= rack->use_fixed_rate;
654 log.u_bbr.flex7 <<= 1;
655 log.u_bbr.flex7 |= rack->rc_pacing_cc_set;
656 log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
658 tcp_log_event_(tp, NULL, NULL, NULL, BBR_LOG_CWND, error,
659 0, &log, false, NULL, NULL, 0, &tv);
664 rack_undo_cc_pacing(struct tcp_rack *rack)
666 struct newreno old, *ptr;
669 if (rack->rc_pacing_cc_set == 0)
672 rack->rc_pacing_cc_set = 0;
673 if (tp->t_cc == NULL)
676 if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0) {
677 /* Not new-reno nothing to do! */
680 ptr = ((struct newreno *)tp->t_ccv.cc_data);
683 * This happens at rack_fini() if the
684 * cc module gets freed on us. In that
685 * case we loose our "new" settings but
686 * thats ok, since the tcb is going away anyway.
690 /* Grab out our set values */
691 memcpy(&old, ptr, sizeof(struct newreno));
692 /* Copy back in the original values */
693 memcpy(ptr, &rack->r_ctl.rc_saved_beta, sizeof(struct newreno));
694 /* Now save back the values we had set in (for when pacing is restored) */
695 memcpy(&rack->r_ctl.rc_saved_beta, &old, sizeof(struct newreno));
696 if (rack_verbose_logging && (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
697 union tcp_log_stackspecific log;
700 ptr = ((struct newreno *)tp->t_ccv.cc_data);
701 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
702 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
703 log.u_bbr.flex1 = ptr->beta;
704 log.u_bbr.flex2 = ptr->beta_ecn;
705 log.u_bbr.flex3 = ptr->newreno_flags;
706 log.u_bbr.flex4 = rack->r_ctl.rc_saved_beta.beta;
707 log.u_bbr.flex5 = rack->r_ctl.rc_saved_beta.beta_ecn;
708 log.u_bbr.flex6 = rack->r_ctl.rc_saved_beta.newreno_flags;
709 log.u_bbr.flex7 = rack->gp_ready;
710 log.u_bbr.flex7 <<= 1;
711 log.u_bbr.flex7 |= rack->use_fixed_rate;
712 log.u_bbr.flex7 <<= 1;
713 log.u_bbr.flex7 |= rack->rc_pacing_cc_set;
714 log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
716 tcp_log_event_(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
717 0, &log, false, NULL, NULL, 0, &tv);
721 #ifdef NETFLIX_PEAKRATE
723 rack_update_peakrate_thr(struct tcpcb *tp)
725 /* Keep in mind that t_maxpeakrate is in B/s. */
727 peak = uqmax((tp->t_maxseg * 2),
728 (((uint64_t)tp->t_maxpeakrate * (uint64_t)(tp->t_srtt)) / (uint64_t)HPTS_USEC_IN_SEC));
729 tp->t_peakrate_thr = (uint32_t)uqmin(peak, UINT32_MAX);
734 sysctl_rack_clear(SYSCTL_HANDLER_ARGS)
739 error = SYSCTL_OUT(req, &rack_clear_counter, sizeof(uint32_t));
740 if (error || req->newptr == NULL)
743 error = SYSCTL_IN(req, &stat, sizeof(uint32_t));
748 printf("Clearing RACK counters\n");
750 counter_u64_zero(rack_tlp_tot);
751 counter_u64_zero(rack_tlp_newdata);
752 counter_u64_zero(rack_tlp_retran);
753 counter_u64_zero(rack_tlp_retran_bytes);
754 counter_u64_zero(rack_to_tot);
755 counter_u64_zero(rack_saw_enobuf);
756 counter_u64_zero(rack_saw_enobuf_hw);
757 counter_u64_zero(rack_saw_enetunreach);
758 counter_u64_zero(rack_persists_sends);
759 counter_u64_zero(rack_persists_acks);
760 counter_u64_zero(rack_persists_loss);
761 counter_u64_zero(rack_persists_lost_ends);
763 counter_u64_zero(rack_adjust_map_bw);
765 counter_u64_zero(rack_to_alloc_hard);
766 counter_u64_zero(rack_to_alloc_emerg);
767 counter_u64_zero(rack_sack_proc_all);
768 counter_u64_zero(rack_fto_send);
769 counter_u64_zero(rack_fto_rsm_send);
770 counter_u64_zero(rack_extended_rfo);
771 counter_u64_zero(rack_hw_pace_init_fail);
772 counter_u64_zero(rack_hw_pace_lost);
773 counter_u64_zero(rack_non_fto_send);
774 counter_u64_zero(rack_nfto_resend);
775 counter_u64_zero(rack_sack_proc_short);
776 counter_u64_zero(rack_sack_proc_restart);
777 counter_u64_zero(rack_to_alloc);
778 counter_u64_zero(rack_to_alloc_limited);
779 counter_u64_zero(rack_alloc_limited_conns);
780 counter_u64_zero(rack_split_limited);
781 counter_u64_zero(rack_multi_single_eq);
782 counter_u64_zero(rack_proc_non_comp_ack);
783 counter_u64_zero(rack_sack_attacks_detected);
784 counter_u64_zero(rack_sack_attacks_reversed);
785 counter_u64_zero(rack_sack_used_next_merge);
786 counter_u64_zero(rack_sack_used_prev_merge);
787 counter_u64_zero(rack_sack_splits);
788 counter_u64_zero(rack_sack_skipped_acked);
789 counter_u64_zero(rack_ack_total);
790 counter_u64_zero(rack_express_sack);
791 counter_u64_zero(rack_sack_total);
792 counter_u64_zero(rack_move_none);
793 counter_u64_zero(rack_move_some);
794 counter_u64_zero(rack_try_scwnd);
795 counter_u64_zero(rack_collapsed_win);
796 counter_u64_zero(rack_collapsed_win_rxt);
797 counter_u64_zero(rack_collapsed_win_seen);
798 counter_u64_zero(rack_collapsed_win_rxt_bytes);
800 rack_clear_counter = 0;
805 rack_init_sysctls(void)
807 struct sysctl_oid *rack_counters;
808 struct sysctl_oid *rack_attack;
809 struct sysctl_oid *rack_pacing;
810 struct sysctl_oid *rack_timely;
811 struct sysctl_oid *rack_timers;
812 struct sysctl_oid *rack_tlp;
813 struct sysctl_oid *rack_misc;
814 struct sysctl_oid *rack_features;
815 struct sysctl_oid *rack_measure;
816 struct sysctl_oid *rack_probertt;
817 struct sysctl_oid *rack_hw_pacing;
818 struct sysctl_oid *rack_tracepoint;
820 rack_attack = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
821 SYSCTL_CHILDREN(rack_sysctl_root),
824 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
825 "Rack Sack Attack Counters and Controls");
826 rack_counters = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
827 SYSCTL_CHILDREN(rack_sysctl_root),
830 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
832 SYSCTL_ADD_S32(&rack_sysctl_ctx,
833 SYSCTL_CHILDREN(rack_sysctl_root),
834 OID_AUTO, "rate_sample_method", CTLFLAG_RW,
835 &rack_rate_sample_method , USE_RTT_LOW,
836 "What method should we use for rate sampling 0=high, 1=low ");
837 /* Probe rtt related controls */
838 rack_probertt = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
839 SYSCTL_CHILDREN(rack_sysctl_root),
842 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
843 "ProbeRTT related Controls");
844 SYSCTL_ADD_U16(&rack_sysctl_ctx,
845 SYSCTL_CHILDREN(rack_probertt),
846 OID_AUTO, "exit_per_hpb", CTLFLAG_RW,
847 &rack_atexit_prtt_hbp, 130,
848 "What percentage above goodput do we clamp CA/SS to at exit on high-BDP path 110%");
849 SYSCTL_ADD_U16(&rack_sysctl_ctx,
850 SYSCTL_CHILDREN(rack_probertt),
851 OID_AUTO, "exit_per_nonhpb", CTLFLAG_RW,
852 &rack_atexit_prtt, 130,
853 "What percentage above goodput do we clamp CA/SS to at exit on a non high-BDP path 100%");
854 SYSCTL_ADD_U16(&rack_sysctl_ctx,
855 SYSCTL_CHILDREN(rack_probertt),
856 OID_AUTO, "gp_per_mul", CTLFLAG_RW,
857 &rack_per_of_gp_probertt, 60,
858 "What percentage of goodput do we pace at in probertt");
859 SYSCTL_ADD_U16(&rack_sysctl_ctx,
860 SYSCTL_CHILDREN(rack_probertt),
861 OID_AUTO, "gp_per_reduce", CTLFLAG_RW,
862 &rack_per_of_gp_probertt_reduce, 10,
863 "What percentage of goodput do we reduce every gp_srtt");
864 SYSCTL_ADD_U16(&rack_sysctl_ctx,
865 SYSCTL_CHILDREN(rack_probertt),
866 OID_AUTO, "gp_per_low", CTLFLAG_RW,
867 &rack_per_of_gp_lowthresh, 40,
868 "What percentage of goodput do we allow the multiplier to fall to");
869 SYSCTL_ADD_U32(&rack_sysctl_ctx,
870 SYSCTL_CHILDREN(rack_probertt),
871 OID_AUTO, "time_between", CTLFLAG_RW,
872 & rack_time_between_probertt, 96000000,
873 "How many useconds between the lowest rtt falling must past before we enter probertt");
874 SYSCTL_ADD_U32(&rack_sysctl_ctx,
875 SYSCTL_CHILDREN(rack_probertt),
876 OID_AUTO, "safety", CTLFLAG_RW,
877 &rack_probe_rtt_safety_val, 2000000,
878 "If not zero, provides a maximum usecond that you can stay in probertt (2sec = 2000000)");
879 SYSCTL_ADD_U32(&rack_sysctl_ctx,
880 SYSCTL_CHILDREN(rack_probertt),
881 OID_AUTO, "sets_cwnd", CTLFLAG_RW,
882 &rack_probe_rtt_sets_cwnd, 0,
883 "Do we set the cwnd too (if always_lower is on)");
884 SYSCTL_ADD_U32(&rack_sysctl_ctx,
885 SYSCTL_CHILDREN(rack_probertt),
886 OID_AUTO, "maxdrainsrtts", CTLFLAG_RW,
887 &rack_max_drain_wait, 2,
888 "Maximum number of gp_srtt's to hold in drain waiting for flight to reach goal");
889 SYSCTL_ADD_U32(&rack_sysctl_ctx,
890 SYSCTL_CHILDREN(rack_probertt),
891 OID_AUTO, "mustdrainsrtts", CTLFLAG_RW,
893 "We must drain this many gp_srtt's waiting for flight to reach goal");
894 SYSCTL_ADD_U32(&rack_sysctl_ctx,
895 SYSCTL_CHILDREN(rack_probertt),
896 OID_AUTO, "goal_use_min_entry", CTLFLAG_RW,
897 &rack_probertt_use_min_rtt_entry, 1,
898 "Should we use the min-rtt to calculate the goal rtt (else gp_srtt) at entry");
899 SYSCTL_ADD_U32(&rack_sysctl_ctx,
900 SYSCTL_CHILDREN(rack_probertt),
901 OID_AUTO, "goal_use_min_exit", CTLFLAG_RW,
902 &rack_probertt_use_min_rtt_exit, 0,
903 "How to set cwnd at exit, 0 - dynamic, 1 - use min-rtt, 2 - use curgprtt, 3 - entry gp-rtt");
904 SYSCTL_ADD_U32(&rack_sysctl_ctx,
905 SYSCTL_CHILDREN(rack_probertt),
906 OID_AUTO, "length_div", CTLFLAG_RW,
907 &rack_probertt_gpsrtt_cnt_div, 0,
908 "How many recent goodput srtt periods plus hold tim does probertt last (bottom of fraction)");
909 SYSCTL_ADD_U32(&rack_sysctl_ctx,
910 SYSCTL_CHILDREN(rack_probertt),
911 OID_AUTO, "length_mul", CTLFLAG_RW,
912 &rack_probertt_gpsrtt_cnt_mul, 0,
913 "How many recent goodput srtt periods plus hold tim does probertt last (top of fraction)");
914 SYSCTL_ADD_U32(&rack_sysctl_ctx,
915 SYSCTL_CHILDREN(rack_probertt),
916 OID_AUTO, "holdtim_at_target", CTLFLAG_RW,
917 &rack_min_probertt_hold, 200000,
918 "What is the minimum time we hold probertt at target");
919 SYSCTL_ADD_U32(&rack_sysctl_ctx,
920 SYSCTL_CHILDREN(rack_probertt),
921 OID_AUTO, "filter_life", CTLFLAG_RW,
922 &rack_probertt_filter_life, 10000000,
923 "What is the time for the filters life in useconds");
924 SYSCTL_ADD_U32(&rack_sysctl_ctx,
925 SYSCTL_CHILDREN(rack_probertt),
926 OID_AUTO, "lower_within", CTLFLAG_RW,
927 &rack_probertt_lower_within, 10,
928 "If the rtt goes lower within this percentage of the time, go into probe-rtt");
929 SYSCTL_ADD_U32(&rack_sysctl_ctx,
930 SYSCTL_CHILDREN(rack_probertt),
931 OID_AUTO, "must_move", CTLFLAG_RW,
932 &rack_min_rtt_movement, 250,
933 "How much is the minimum movement in rtt to count as a drop for probertt purposes");
934 SYSCTL_ADD_U32(&rack_sysctl_ctx,
935 SYSCTL_CHILDREN(rack_probertt),
936 OID_AUTO, "clear_is_cnts", CTLFLAG_RW,
937 &rack_probertt_clear_is, 1,
938 "Do we clear I/S counts on exiting probe-rtt");
939 SYSCTL_ADD_S32(&rack_sysctl_ctx,
940 SYSCTL_CHILDREN(rack_probertt),
941 OID_AUTO, "hbp_extra_drain", CTLFLAG_RW,
942 &rack_max_drain_hbp, 1,
943 "How many extra drain gpsrtt's do we get in highly buffered paths");
944 SYSCTL_ADD_S32(&rack_sysctl_ctx,
945 SYSCTL_CHILDREN(rack_probertt),
946 OID_AUTO, "hbp_threshold", CTLFLAG_RW,
948 "We are highly buffered if min_rtt_seen / max_rtt_seen > this-threshold");
950 rack_tracepoint = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
951 SYSCTL_CHILDREN(rack_sysctl_root),
954 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
955 "Rack tracepoint facility");
956 SYSCTL_ADD_U32(&rack_sysctl_ctx,
957 SYSCTL_CHILDREN(rack_tracepoint),
958 OID_AUTO, "number", CTLFLAG_RW,
959 &rack_trace_point_config, 0,
960 "What is the trace point number to activate (0=none, 0xffffffff = all)?");
961 SYSCTL_ADD_U32(&rack_sysctl_ctx,
962 SYSCTL_CHILDREN(rack_tracepoint),
963 OID_AUTO, "bbmode", CTLFLAG_RW,
964 &rack_trace_point_bb_mode, 4,
965 "What is BB logging mode that is activated?");
966 SYSCTL_ADD_S32(&rack_sysctl_ctx,
967 SYSCTL_CHILDREN(rack_tracepoint),
968 OID_AUTO, "count", CTLFLAG_RW,
969 &rack_trace_point_count, 0,
970 "How many connections will have BB logging turned on that hit the tracepoint?");
971 /* Pacing related sysctls */
972 rack_pacing = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
973 SYSCTL_CHILDREN(rack_sysctl_root),
976 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
977 "Pacing related Controls");
978 SYSCTL_ADD_S32(&rack_sysctl_ctx,
979 SYSCTL_CHILDREN(rack_pacing),
980 OID_AUTO, "max_pace_over", CTLFLAG_RW,
981 &rack_max_per_above, 30,
982 "What is the maximum allowable percentage that we can pace above (so 30 = 130% of our goal)");
983 SYSCTL_ADD_S32(&rack_sysctl_ctx,
984 SYSCTL_CHILDREN(rack_pacing),
985 OID_AUTO, "pace_to_one", CTLFLAG_RW,
986 &rack_pace_one_seg, 0,
987 "Do we allow low b/w pacing of 1MSS instead of two");
988 SYSCTL_ADD_S32(&rack_sysctl_ctx,
989 SYSCTL_CHILDREN(rack_pacing),
990 OID_AUTO, "limit_wsrtt", CTLFLAG_RW,
991 &rack_limit_time_with_srtt, 0,
992 "Do we limit pacing time based on srtt");
993 SYSCTL_ADD_S32(&rack_sysctl_ctx,
994 SYSCTL_CHILDREN(rack_pacing),
995 OID_AUTO, "init_win", CTLFLAG_RW,
996 &rack_default_init_window, 0,
997 "Do we have a rack initial window 0 = system default");
998 SYSCTL_ADD_U16(&rack_sysctl_ctx,
999 SYSCTL_CHILDREN(rack_pacing),
1000 OID_AUTO, "gp_per_ss", CTLFLAG_RW,
1001 &rack_per_of_gp_ss, 250,
1002 "If non zero, what percentage of goodput to pace at in slow start");
1003 SYSCTL_ADD_U16(&rack_sysctl_ctx,
1004 SYSCTL_CHILDREN(rack_pacing),
1005 OID_AUTO, "gp_per_ca", CTLFLAG_RW,
1006 &rack_per_of_gp_ca, 150,
1007 "If non zero, what percentage of goodput to pace at in congestion avoidance");
1008 SYSCTL_ADD_U16(&rack_sysctl_ctx,
1009 SYSCTL_CHILDREN(rack_pacing),
1010 OID_AUTO, "gp_per_rec", CTLFLAG_RW,
1011 &rack_per_of_gp_rec, 200,
1012 "If non zero, what percentage of goodput to pace at in recovery");
1013 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1014 SYSCTL_CHILDREN(rack_pacing),
1015 OID_AUTO, "pace_max_seg", CTLFLAG_RW,
1016 &rack_hptsi_segments, 40,
1017 "What size is the max for TSO segments in pacing and burst mitigation");
1018 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1019 SYSCTL_CHILDREN(rack_pacing),
1020 OID_AUTO, "burst_reduces", CTLFLAG_RW,
1021 &rack_slot_reduction, 4,
1022 "When doing only burst mitigation what is the reduce divisor");
1023 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1024 SYSCTL_CHILDREN(rack_sysctl_root),
1025 OID_AUTO, "use_pacing", CTLFLAG_RW,
1026 &rack_pace_every_seg, 0,
1027 "If set we use pacing, if clear we use only the original burst mitigation");
1028 SYSCTL_ADD_U64(&rack_sysctl_ctx,
1029 SYSCTL_CHILDREN(rack_pacing),
1030 OID_AUTO, "rate_cap", CTLFLAG_RW,
1031 &rack_bw_rate_cap, 0,
1032 "If set we apply this value to the absolute rate cap used by pacing");
1033 SYSCTL_ADD_U8(&rack_sysctl_ctx,
1034 SYSCTL_CHILDREN(rack_sysctl_root),
1035 OID_AUTO, "req_measure_cnt", CTLFLAG_RW,
1036 &rack_req_measurements, 1,
1037 "If doing dynamic pacing, how many measurements must be in before we start pacing?");
1038 /* Hardware pacing */
1039 rack_hw_pacing = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
1040 SYSCTL_CHILDREN(rack_sysctl_root),
1043 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1044 "Pacing related Controls");
1045 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1046 SYSCTL_CHILDREN(rack_hw_pacing),
1047 OID_AUTO, "rwnd_factor", CTLFLAG_RW,
1048 &rack_hw_rwnd_factor, 2,
1049 "How many times does snd_wnd need to be bigger than pace_max_seg so we will hold off and get more acks?");
1050 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1051 SYSCTL_CHILDREN(rack_hw_pacing),
1052 OID_AUTO, "pace_enobuf_mult", CTLFLAG_RW,
1053 &rack_enobuf_hw_boost_mult, 2,
1054 "By how many time_betweens should we boost the pacing time if we see a ENOBUFS?");
1055 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1056 SYSCTL_CHILDREN(rack_hw_pacing),
1057 OID_AUTO, "pace_enobuf_max", CTLFLAG_RW,
1058 &rack_enobuf_hw_max, 2,
1059 "What is the max boost the pacing time if we see a ENOBUFS?");
1060 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1061 SYSCTL_CHILDREN(rack_hw_pacing),
1062 OID_AUTO, "pace_enobuf_min", CTLFLAG_RW,
1063 &rack_enobuf_hw_min, 2,
1064 "What is the min boost the pacing time if we see a ENOBUFS?");
1065 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1066 SYSCTL_CHILDREN(rack_hw_pacing),
1067 OID_AUTO, "enable", CTLFLAG_RW,
1068 &rack_enable_hw_pacing, 0,
1069 "Should RACK attempt to use hw pacing?");
1070 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1071 SYSCTL_CHILDREN(rack_hw_pacing),
1072 OID_AUTO, "rate_cap", CTLFLAG_RW,
1073 &rack_hw_rate_caps, 1,
1074 "Does the highest hardware pacing rate cap the rate we will send at??");
1075 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1076 SYSCTL_CHILDREN(rack_hw_pacing),
1077 OID_AUTO, "rate_min", CTLFLAG_RW,
1078 &rack_hw_rate_min, 0,
1079 "Do we need a minimum estimate of this many bytes per second in order to engage hw pacing?");
1080 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1081 SYSCTL_CHILDREN(rack_hw_pacing),
1082 OID_AUTO, "rate_to_low", CTLFLAG_RW,
1083 &rack_hw_rate_to_low, 0,
1084 "If we fall below this rate, dis-engage hw pacing?");
1085 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1086 SYSCTL_CHILDREN(rack_hw_pacing),
1087 OID_AUTO, "up_only", CTLFLAG_RW,
1088 &rack_hw_up_only, 1,
1089 "Do we allow hw pacing to lower the rate selected?");
1090 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1091 SYSCTL_CHILDREN(rack_hw_pacing),
1092 OID_AUTO, "extra_mss_precise", CTLFLAG_RW,
1093 &rack_hw_pace_extra_slots, 2,
1094 "If the rates between software and hardware match precisely how many extra time_betweens do we get?");
1095 rack_timely = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
1096 SYSCTL_CHILDREN(rack_sysctl_root),
1099 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1100 "Rack Timely RTT Controls");
1101 /* Timely based GP dynmics */
1102 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1103 SYSCTL_CHILDREN(rack_timely),
1104 OID_AUTO, "upper", CTLFLAG_RW,
1105 &rack_gp_per_bw_mul_up, 2,
1106 "Rack timely upper range for equal b/w (in percentage)");
1107 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1108 SYSCTL_CHILDREN(rack_timely),
1109 OID_AUTO, "lower", CTLFLAG_RW,
1110 &rack_gp_per_bw_mul_down, 4,
1111 "Rack timely lower range for equal b/w (in percentage)");
1112 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1113 SYSCTL_CHILDREN(rack_timely),
1114 OID_AUTO, "rtt_max_mul", CTLFLAG_RW,
1115 &rack_gp_rtt_maxmul, 3,
1116 "Rack timely multiplier of lowest rtt for rtt_max");
1117 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1118 SYSCTL_CHILDREN(rack_timely),
1119 OID_AUTO, "rtt_min_div", CTLFLAG_RW,
1120 &rack_gp_rtt_mindiv, 4,
1121 "Rack timely divisor used for rtt + (rtt * mul/divisor) for check for lower rtt");
1122 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1123 SYSCTL_CHILDREN(rack_timely),
1124 OID_AUTO, "rtt_min_mul", CTLFLAG_RW,
1125 &rack_gp_rtt_minmul, 1,
1126 "Rack timely multiplier used for rtt + (rtt * mul/divisor) for check for lower rtt");
1127 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1128 SYSCTL_CHILDREN(rack_timely),
1129 OID_AUTO, "decrease", CTLFLAG_RW,
1130 &rack_gp_decrease_per, 20,
1131 "Rack timely decrease percentage of our GP multiplication factor");
1132 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1133 SYSCTL_CHILDREN(rack_timely),
1134 OID_AUTO, "increase", CTLFLAG_RW,
1135 &rack_gp_increase_per, 2,
1136 "Rack timely increase perentage of our GP multiplication factor");
1137 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1138 SYSCTL_CHILDREN(rack_timely),
1139 OID_AUTO, "lowerbound", CTLFLAG_RW,
1140 &rack_per_lower_bound, 50,
1141 "Rack timely lowest percentage we allow GP multiplier to fall to");
1142 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1143 SYSCTL_CHILDREN(rack_timely),
1144 OID_AUTO, "upperboundss", CTLFLAG_RW,
1145 &rack_per_upper_bound_ss, 0,
1146 "Rack timely highest percentage we allow GP multiplier in SS to raise to (0 is no upperbound)");
1147 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1148 SYSCTL_CHILDREN(rack_timely),
1149 OID_AUTO, "upperboundca", CTLFLAG_RW,
1150 &rack_per_upper_bound_ca, 0,
1151 "Rack timely highest percentage we allow GP multiplier to CA raise to (0 is no upperbound)");
1152 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1153 SYSCTL_CHILDREN(rack_timely),
1154 OID_AUTO, "dynamicgp", CTLFLAG_RW,
1155 &rack_do_dyn_mul, 0,
1156 "Rack timely do we enable dynmaic timely goodput by default");
1157 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1158 SYSCTL_CHILDREN(rack_timely),
1159 OID_AUTO, "no_rec_red", CTLFLAG_RW,
1160 &rack_gp_no_rec_chg, 1,
1161 "Rack timely do we prohibit the recovery multiplier from being lowered");
1162 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1163 SYSCTL_CHILDREN(rack_timely),
1164 OID_AUTO, "red_clear_cnt", CTLFLAG_RW,
1165 &rack_timely_dec_clear, 6,
1166 "Rack timely what threshold do we count to before another boost during b/w decent");
1167 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1168 SYSCTL_CHILDREN(rack_timely),
1169 OID_AUTO, "max_push_rise", CTLFLAG_RW,
1170 &rack_timely_max_push_rise, 3,
1171 "Rack timely how many times do we push up with b/w increase");
1172 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1173 SYSCTL_CHILDREN(rack_timely),
1174 OID_AUTO, "max_push_drop", CTLFLAG_RW,
1175 &rack_timely_max_push_drop, 3,
1176 "Rack timely how many times do we push back on b/w decent");
1177 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1178 SYSCTL_CHILDREN(rack_timely),
1179 OID_AUTO, "min_segs", CTLFLAG_RW,
1180 &rack_timely_min_segs, 4,
1181 "Rack timely when setting the cwnd what is the min num segments");
1182 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1183 SYSCTL_CHILDREN(rack_timely),
1184 OID_AUTO, "noback_max", CTLFLAG_RW,
1185 &rack_use_max_for_nobackoff, 0,
1186 "Rack timely when deciding if to backoff on a loss, do we use under max rtt else min");
1187 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1188 SYSCTL_CHILDREN(rack_timely),
1189 OID_AUTO, "interim_timely_only", CTLFLAG_RW,
1190 &rack_timely_int_timely_only, 0,
1191 "Rack timely when doing interim timely's do we only do timely (no b/w consideration)");
1192 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1193 SYSCTL_CHILDREN(rack_timely),
1194 OID_AUTO, "nonstop", CTLFLAG_RW,
1195 &rack_timely_no_stopping, 0,
1196 "Rack timely don't stop increase");
1197 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1198 SYSCTL_CHILDREN(rack_timely),
1199 OID_AUTO, "dec_raise_thresh", CTLFLAG_RW,
1200 &rack_down_raise_thresh, 100,
1201 "If the CA or SS is below this threshold raise on the first 3 b/w lowers (0=always)");
1202 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1203 SYSCTL_CHILDREN(rack_timely),
1204 OID_AUTO, "bottom_drag_segs", CTLFLAG_RW,
1206 "Bottom dragging if not these many segments outstanding and room");
1208 /* TLP and Rack related parameters */
1209 rack_tlp = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
1210 SYSCTL_CHILDREN(rack_sysctl_root),
1213 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1214 "TLP and Rack related Controls");
1215 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1216 SYSCTL_CHILDREN(rack_tlp),
1217 OID_AUTO, "use_rrr", CTLFLAG_RW,
1219 "Do we use Rack Rapid Recovery");
1220 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1221 SYSCTL_CHILDREN(rack_tlp),
1222 OID_AUTO, "post_rec_labc", CTLFLAG_RW,
1223 &rack_max_abc_post_recovery, 2,
1224 "Since we do early recovery, do we override the l_abc to a value, if so what?");
1225 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1226 SYSCTL_CHILDREN(rack_tlp),
1227 OID_AUTO, "nonrxt_use_cr", CTLFLAG_RW,
1228 &rack_non_rxt_use_cr, 0,
1229 "Do we use ss/ca rate if in recovery we are transmitting a new data chunk");
1230 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1231 SYSCTL_CHILDREN(rack_tlp),
1232 OID_AUTO, "tlpmethod", CTLFLAG_RW,
1233 &rack_tlp_threshold_use, TLP_USE_TWO_ONE,
1234 "What method do we do for TLP time calc 0=no-de-ack-comp, 1=ID, 2=2.1, 3=2.2");
1235 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1236 SYSCTL_CHILDREN(rack_tlp),
1237 OID_AUTO, "limit", CTLFLAG_RW,
1239 "How many TLP's can be sent without sending new data");
1240 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1241 SYSCTL_CHILDREN(rack_tlp),
1242 OID_AUTO, "use_greater", CTLFLAG_RW,
1243 &rack_tlp_use_greater, 1,
1244 "Should we use the rack_rtt time if its greater than srtt");
1245 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1246 SYSCTL_CHILDREN(rack_tlp),
1247 OID_AUTO, "tlpminto", CTLFLAG_RW,
1248 &rack_tlp_min, 10000,
1249 "TLP minimum timeout per the specification (in microseconds)");
1250 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1251 SYSCTL_CHILDREN(rack_tlp),
1252 OID_AUTO, "send_oldest", CTLFLAG_RW,
1253 &rack_always_send_oldest, 0,
1254 "Should we always send the oldest TLP and RACK-TLP");
1255 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1256 SYSCTL_CHILDREN(rack_tlp),
1257 OID_AUTO, "rack_tlimit", CTLFLAG_RW,
1258 &rack_limited_retran, 0,
1259 "How many times can a rack timeout drive out sends");
1260 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1261 SYSCTL_CHILDREN(rack_tlp),
1262 OID_AUTO, "tlp_cwnd_flag", CTLFLAG_RW,
1263 &rack_lower_cwnd_at_tlp, 0,
1264 "When a TLP completes a retran should we enter recovery");
1265 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1266 SYSCTL_CHILDREN(rack_tlp),
1267 OID_AUTO, "reorder_thresh", CTLFLAG_RW,
1268 &rack_reorder_thresh, 2,
1269 "What factor for rack will be added when seeing reordering (shift right)");
1270 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1271 SYSCTL_CHILDREN(rack_tlp),
1272 OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW,
1273 &rack_tlp_thresh, 1,
1274 "What divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)");
1275 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1276 SYSCTL_CHILDREN(rack_tlp),
1277 OID_AUTO, "reorder_fade", CTLFLAG_RW,
1278 &rack_reorder_fade, 60000000,
1279 "Does reorder detection fade, if so how many microseconds (0 means never)");
1280 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1281 SYSCTL_CHILDREN(rack_tlp),
1282 OID_AUTO, "pktdelay", CTLFLAG_RW,
1283 &rack_pkt_delay, 1000,
1284 "Extra RACK time (in microseconds) besides reordering thresh");
1286 /* Timer related controls */
1287 rack_timers = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
1288 SYSCTL_CHILDREN(rack_sysctl_root),
1291 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1292 "Timer related controls");
1293 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1294 SYSCTL_CHILDREN(rack_timers),
1295 OID_AUTO, "persmin", CTLFLAG_RW,
1296 &rack_persist_min, 250000,
1297 "What is the minimum time in microseconds between persists");
1298 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1299 SYSCTL_CHILDREN(rack_timers),
1300 OID_AUTO, "persmax", CTLFLAG_RW,
1301 &rack_persist_max, 2000000,
1302 "What is the largest delay in microseconds between persists");
1303 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1304 SYSCTL_CHILDREN(rack_timers),
1305 OID_AUTO, "delayed_ack", CTLFLAG_RW,
1306 &rack_delayed_ack_time, 40000,
1307 "Delayed ack time (40ms in microseconds)");
1308 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1309 SYSCTL_CHILDREN(rack_timers),
1310 OID_AUTO, "minrto", CTLFLAG_RW,
1311 &rack_rto_min, 30000,
1312 "Minimum RTO in microseconds -- set with caution below 1000 due to TLP");
1313 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1314 SYSCTL_CHILDREN(rack_timers),
1315 OID_AUTO, "maxrto", CTLFLAG_RW,
1316 &rack_rto_max, 4000000,
1317 "Maximum RTO in microseconds -- should be at least as large as min_rto");
1318 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1319 SYSCTL_CHILDREN(rack_timers),
1320 OID_AUTO, "minto", CTLFLAG_RW,
1322 "Minimum rack timeout in microseconds");
1323 /* Measure controls */
1324 rack_measure = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
1325 SYSCTL_CHILDREN(rack_sysctl_root),
1328 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1329 "Measure related controls");
1330 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1331 SYSCTL_CHILDREN(rack_measure),
1332 OID_AUTO, "wma_divisor", CTLFLAG_RW,
1333 &rack_wma_divisor, 8,
1334 "When doing b/w calculation what is the divisor for the WMA");
1335 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1336 SYSCTL_CHILDREN(rack_measure),
1337 OID_AUTO, "end_cwnd", CTLFLAG_RW,
1338 &rack_cwnd_block_ends_measure, 0,
1339 "Does a cwnd just-return end the measurement window (app limited)");
1340 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1341 SYSCTL_CHILDREN(rack_measure),
1342 OID_AUTO, "end_rwnd", CTLFLAG_RW,
1343 &rack_rwnd_block_ends_measure, 0,
1344 "Does an rwnd just-return end the measurement window (app limited -- not persists)");
1345 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1346 SYSCTL_CHILDREN(rack_measure),
1347 OID_AUTO, "min_target", CTLFLAG_RW,
1348 &rack_def_data_window, 20,
1349 "What is the minimum target window (in mss) for a GP measurements");
1350 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1351 SYSCTL_CHILDREN(rack_measure),
1352 OID_AUTO, "goal_bdp", CTLFLAG_RW,
1354 "What is the goal BDP to measure");
1355 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1356 SYSCTL_CHILDREN(rack_measure),
1357 OID_AUTO, "min_srtts", CTLFLAG_RW,
1359 "What is the goal BDP to measure");
1360 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1361 SYSCTL_CHILDREN(rack_measure),
1362 OID_AUTO, "min_measure_tim", CTLFLAG_RW,
1363 &rack_min_measure_usec, 0,
1364 "What is the Minimum time time for a measurement if 0, this is off");
1366 rack_features = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
1367 SYSCTL_CHILDREN(rack_sysctl_root),
1370 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1371 "Feature controls");
1372 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1373 SYSCTL_CHILDREN(rack_features),
1374 OID_AUTO, "cmpack", CTLFLAG_RW,
1375 &rack_use_cmp_acks, 1,
1376 "Should RACK have LRO send compressed acks");
1377 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1378 SYSCTL_CHILDREN(rack_features),
1379 OID_AUTO, "fsb", CTLFLAG_RW,
1381 "Should RACK use the fast send block?");
1382 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1383 SYSCTL_CHILDREN(rack_features),
1384 OID_AUTO, "rfo", CTLFLAG_RW,
1386 "Should RACK use rack_fast_output()?");
1387 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1388 SYSCTL_CHILDREN(rack_features),
1389 OID_AUTO, "rsmrfo", CTLFLAG_RW,
1390 &rack_use_rsm_rfo, 1,
1391 "Should RACK use rack_fast_rsm_output()?");
1392 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1393 SYSCTL_CHILDREN(rack_features),
1394 OID_AUTO, "non_paced_lro_queue", CTLFLAG_RW,
1395 &rack_enable_mqueue_for_nonpaced, 0,
1396 "Should RACK use mbuf queuing for non-paced connections");
1397 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1398 SYSCTL_CHILDREN(rack_features),
1399 OID_AUTO, "hystartplusplus", CTLFLAG_RW,
1400 &rack_do_hystart, 0,
1401 "Should RACK enable HyStart++ on connections?");
1402 /* Misc rack controls */
1403 rack_misc = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
1404 SYSCTL_CHILDREN(rack_sysctl_root),
1407 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1408 "Misc related controls");
1409 #ifdef TCP_ACCOUNTING
1410 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1411 SYSCTL_CHILDREN(rack_misc),
1412 OID_AUTO, "tcp_acct", CTLFLAG_RW,
1413 &rack_tcp_accounting, 0,
1414 "Should we turn on TCP accounting for all rack sessions?");
1416 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1417 SYSCTL_CHILDREN(rack_misc),
1418 OID_AUTO, "apply_rtt_with_low_conf", CTLFLAG_RW,
1419 &rack_apply_rtt_with_reduced_conf, 0,
1420 "When a persist or keep-alive probe is not answered do we calculate rtt on subsequent answers?");
1421 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1422 SYSCTL_CHILDREN(rack_misc),
1423 OID_AUTO, "rack_dsack_ctl", CTLFLAG_RW,
1424 &rack_dsack_std_based, 3,
1425 "How do we process dsack with respect to rack timers, bit field, 3 is standards based?");
1426 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1427 SYSCTL_CHILDREN(rack_misc),
1428 OID_AUTO, "prr_addback_max", CTLFLAG_RW,
1429 &rack_prr_addbackmax, 2,
1430 "What is the maximum number of MSS we allow to be added back if prr can't send all its data?");
1431 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1432 SYSCTL_CHILDREN(rack_misc),
1433 OID_AUTO, "stats_gets_ms", CTLFLAG_RW,
1434 &rack_stats_gets_ms_rtt, 1,
1435 "What do we feed the stats framework (1 = ms_rtt, 0 = us_rtt, 2 = ms_rtt from hdwr, > 2 usec rtt from hdwr)?");
1436 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1437 SYSCTL_CHILDREN(rack_misc),
1438 OID_AUTO, "clientlowbuf", CTLFLAG_RW,
1439 &rack_client_low_buf, 0,
1440 "Client low buffer level (below this we are more aggressive in DGP exiting recovery (0 = off)?");
1441 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1442 SYSCTL_CHILDREN(rack_misc),
1443 OID_AUTO, "defprofile", CTLFLAG_RW,
1444 &rack_def_profile, 0,
1445 "Should RACK use a default profile (0=no, num == profile num)?");
1446 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1447 SYSCTL_CHILDREN(rack_misc),
1448 OID_AUTO, "shared_cwnd", CTLFLAG_RW,
1449 &rack_enable_shared_cwnd, 1,
1450 "Should RACK try to use the shared cwnd on connections where allowed");
1451 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1452 SYSCTL_CHILDREN(rack_misc),
1453 OID_AUTO, "limits_on_scwnd", CTLFLAG_RW,
1454 &rack_limits_scwnd, 1,
1455 "Should RACK place low end time limits on the shared cwnd feature");
1456 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1457 SYSCTL_CHILDREN(rack_misc),
1458 OID_AUTO, "iMac_dack", CTLFLAG_RW,
1459 &rack_use_imac_dack, 0,
1460 "Should RACK try to emulate iMac delayed ack");
1461 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1462 SYSCTL_CHILDREN(rack_misc),
1463 OID_AUTO, "no_prr", CTLFLAG_RW,
1464 &rack_disable_prr, 0,
1465 "Should RACK not use prr and only pace (must have pacing on)");
1466 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1467 SYSCTL_CHILDREN(rack_misc),
1468 OID_AUTO, "bb_verbose", CTLFLAG_RW,
1469 &rack_verbose_logging, 0,
1470 "Should RACK black box logging be verbose");
1471 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1472 SYSCTL_CHILDREN(rack_misc),
1473 OID_AUTO, "data_after_close", CTLFLAG_RW,
1474 &rack_ignore_data_after_close, 1,
1475 "Do we hold off sending a RST until all pending data is ack'd");
1476 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1477 SYSCTL_CHILDREN(rack_misc),
1478 OID_AUTO, "no_sack_needed", CTLFLAG_RW,
1479 &rack_sack_not_required, 1,
1480 "Do we allow rack to run on connections not supporting SACK");
1481 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1482 SYSCTL_CHILDREN(rack_misc),
1483 OID_AUTO, "prr_sendalot", CTLFLAG_RW,
1484 &rack_send_a_lot_in_prr, 1,
1485 "Send a lot in prr");
1486 SYSCTL_ADD_S32(&rack_sysctl_ctx,
1487 SYSCTL_CHILDREN(rack_misc),
1488 OID_AUTO, "autoscale", CTLFLAG_RW,
1489 &rack_autosndbuf_inc, 20,
1490 "What percentage should rack scale up its snd buffer by?");
1491 /* Sack Attacker detection stuff */
1492 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1493 SYSCTL_CHILDREN(rack_attack),
1494 OID_AUTO, "detect_highsackratio", CTLFLAG_RW,
1495 &rack_highest_sack_thresh_seen, 0,
1496 "Highest sack to ack ratio seen");
1497 SYSCTL_ADD_U32(&rack_sysctl_ctx,
1498 SYSCTL_CHILDREN(rack_attack),
1499 OID_AUTO, "detect_highmoveratio", CTLFLAG_RW,
1500 &rack_highest_move_thresh_seen, 0,
1501 "Highest move to non-move ratio seen");
1502 rack_ack_total = counter_u64_alloc(M_WAITOK);
1503 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1504 SYSCTL_CHILDREN(rack_attack),
1505 OID_AUTO, "acktotal", CTLFLAG_RD,
1507 "Total number of Ack's");
1508 rack_express_sack = counter_u64_alloc(M_WAITOK);
1509 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1510 SYSCTL_CHILDREN(rack_attack),
1511 OID_AUTO, "exp_sacktotal", CTLFLAG_RD,
1513 "Total expresss number of Sack's");
1514 rack_sack_total = counter_u64_alloc(M_WAITOK);
1515 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1516 SYSCTL_CHILDREN(rack_attack),
1517 OID_AUTO, "sacktotal", CTLFLAG_RD,
1519 "Total number of SACKs");
1520 rack_move_none = counter_u64_alloc(M_WAITOK);
1521 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1522 SYSCTL_CHILDREN(rack_attack),
1523 OID_AUTO, "move_none", CTLFLAG_RD,
1525 "Total number of SACK index reuse of positions under threshold");
1526 rack_move_some = counter_u64_alloc(M_WAITOK);
1527 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1528 SYSCTL_CHILDREN(rack_attack),
1529 OID_AUTO, "move_some", CTLFLAG_RD,
1531 "Total number of SACK index reuse of positions over threshold");
1532 rack_sack_attacks_detected = counter_u64_alloc(M_WAITOK);
1533 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1534 SYSCTL_CHILDREN(rack_attack),
1535 OID_AUTO, "attacks", CTLFLAG_RD,
1536 &rack_sack_attacks_detected,
1537 "Total number of SACK attackers that had sack disabled");
1538 rack_sack_attacks_reversed = counter_u64_alloc(M_WAITOK);
1539 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1540 SYSCTL_CHILDREN(rack_attack),
1541 OID_AUTO, "reversed", CTLFLAG_RD,
1542 &rack_sack_attacks_reversed,
1543 "Total number of SACK attackers that were later determined false positive");
1544 rack_sack_used_next_merge = counter_u64_alloc(M_WAITOK);
1545 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1546 SYSCTL_CHILDREN(rack_attack),
1547 OID_AUTO, "nextmerge", CTLFLAG_RD,
1548 &rack_sack_used_next_merge,
1549 "Total number of times we used the next merge");
1550 rack_sack_used_prev_merge = counter_u64_alloc(M_WAITOK);
1551 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1552 SYSCTL_CHILDREN(rack_attack),
1553 OID_AUTO, "prevmerge", CTLFLAG_RD,
1554 &rack_sack_used_prev_merge,
1555 "Total number of times we used the prev merge");
1557 rack_fto_send = counter_u64_alloc(M_WAITOK);
1558 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1559 SYSCTL_CHILDREN(rack_counters),
1560 OID_AUTO, "fto_send", CTLFLAG_RD,
1561 &rack_fto_send, "Total number of rack_fast_output sends");
1562 rack_fto_rsm_send = counter_u64_alloc(M_WAITOK);
1563 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1564 SYSCTL_CHILDREN(rack_counters),
1565 OID_AUTO, "fto_rsm_send", CTLFLAG_RD,
1566 &rack_fto_rsm_send, "Total number of rack_fast_rsm_output sends");
1567 rack_nfto_resend = counter_u64_alloc(M_WAITOK);
1568 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1569 SYSCTL_CHILDREN(rack_counters),
1570 OID_AUTO, "nfto_resend", CTLFLAG_RD,
1571 &rack_nfto_resend, "Total number of rack_output retransmissions");
1572 rack_non_fto_send = counter_u64_alloc(M_WAITOK);
1573 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1574 SYSCTL_CHILDREN(rack_counters),
1575 OID_AUTO, "nfto_send", CTLFLAG_RD,
1576 &rack_non_fto_send, "Total number of rack_output first sends");
1577 rack_extended_rfo = counter_u64_alloc(M_WAITOK);
1578 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1579 SYSCTL_CHILDREN(rack_counters),
1580 OID_AUTO, "rfo_extended", CTLFLAG_RD,
1581 &rack_extended_rfo, "Total number of times we extended rfo");
1583 rack_hw_pace_init_fail = counter_u64_alloc(M_WAITOK);
1584 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1585 SYSCTL_CHILDREN(rack_counters),
1586 OID_AUTO, "hwpace_init_fail", CTLFLAG_RD,
1587 &rack_hw_pace_init_fail, "Total number of times we failed to initialize hw pacing");
1588 rack_hw_pace_lost = counter_u64_alloc(M_WAITOK);
1590 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1591 SYSCTL_CHILDREN(rack_counters),
1592 OID_AUTO, "hwpace_lost", CTLFLAG_RD,
1593 &rack_hw_pace_lost, "Total number of times we failed to initialize hw pacing");
1594 rack_tlp_tot = counter_u64_alloc(M_WAITOK);
1595 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1596 SYSCTL_CHILDREN(rack_counters),
1597 OID_AUTO, "tlp_to_total", CTLFLAG_RD,
1599 "Total number of tail loss probe expirations");
1600 rack_tlp_newdata = counter_u64_alloc(M_WAITOK);
1601 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1602 SYSCTL_CHILDREN(rack_counters),
1603 OID_AUTO, "tlp_new", CTLFLAG_RD,
1605 "Total number of tail loss probe sending new data");
1606 rack_tlp_retran = counter_u64_alloc(M_WAITOK);
1607 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1608 SYSCTL_CHILDREN(rack_counters),
1609 OID_AUTO, "tlp_retran", CTLFLAG_RD,
1611 "Total number of tail loss probe sending retransmitted data");
1612 rack_tlp_retran_bytes = counter_u64_alloc(M_WAITOK);
1613 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1614 SYSCTL_CHILDREN(rack_counters),
1615 OID_AUTO, "tlp_retran_bytes", CTLFLAG_RD,
1616 &rack_tlp_retran_bytes,
1617 "Total bytes of tail loss probe sending retransmitted data");
1618 rack_to_tot = counter_u64_alloc(M_WAITOK);
1619 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1620 SYSCTL_CHILDREN(rack_counters),
1621 OID_AUTO, "rack_to_tot", CTLFLAG_RD,
1623 "Total number of times the rack to expired");
1624 rack_saw_enobuf = counter_u64_alloc(M_WAITOK);
1625 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1626 SYSCTL_CHILDREN(rack_counters),
1627 OID_AUTO, "saw_enobufs", CTLFLAG_RD,
1629 "Total number of times a sends returned enobuf for non-hdwr paced connections");
1630 rack_saw_enobuf_hw = counter_u64_alloc(M_WAITOK);
1631 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1632 SYSCTL_CHILDREN(rack_counters),
1633 OID_AUTO, "saw_enobufs_hw", CTLFLAG_RD,
1634 &rack_saw_enobuf_hw,
1635 "Total number of times a send returned enobuf for hdwr paced connections");
1636 rack_saw_enetunreach = counter_u64_alloc(M_WAITOK);
1637 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1638 SYSCTL_CHILDREN(rack_counters),
1639 OID_AUTO, "saw_enetunreach", CTLFLAG_RD,
1640 &rack_saw_enetunreach,
1641 "Total number of times a send received a enetunreachable");
1642 rack_hot_alloc = counter_u64_alloc(M_WAITOK);
1643 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1644 SYSCTL_CHILDREN(rack_counters),
1645 OID_AUTO, "alloc_hot", CTLFLAG_RD,
1647 "Total allocations from the top of our list");
1648 rack_to_alloc = counter_u64_alloc(M_WAITOK);
1649 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1650 SYSCTL_CHILDREN(rack_counters),
1651 OID_AUTO, "allocs", CTLFLAG_RD,
1653 "Total allocations of tracking structures");
1654 rack_to_alloc_hard = counter_u64_alloc(M_WAITOK);
1655 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1656 SYSCTL_CHILDREN(rack_counters),
1657 OID_AUTO, "allochard", CTLFLAG_RD,
1658 &rack_to_alloc_hard,
1659 "Total allocations done with sleeping the hard way");
1660 rack_to_alloc_emerg = counter_u64_alloc(M_WAITOK);
1661 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1662 SYSCTL_CHILDREN(rack_counters),
1663 OID_AUTO, "allocemerg", CTLFLAG_RD,
1664 &rack_to_alloc_emerg,
1665 "Total allocations done from emergency cache");
1666 rack_to_alloc_limited = counter_u64_alloc(M_WAITOK);
1667 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1668 SYSCTL_CHILDREN(rack_counters),
1669 OID_AUTO, "alloc_limited", CTLFLAG_RD,
1670 &rack_to_alloc_limited,
1671 "Total allocations dropped due to limit");
1672 rack_alloc_limited_conns = counter_u64_alloc(M_WAITOK);
1673 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1674 SYSCTL_CHILDREN(rack_counters),
1675 OID_AUTO, "alloc_limited_conns", CTLFLAG_RD,
1676 &rack_alloc_limited_conns,
1677 "Connections with allocations dropped due to limit");
1678 rack_split_limited = counter_u64_alloc(M_WAITOK);
1679 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1680 SYSCTL_CHILDREN(rack_counters),
1681 OID_AUTO, "split_limited", CTLFLAG_RD,
1682 &rack_split_limited,
1683 "Split allocations dropped due to limit");
1684 rack_persists_sends = counter_u64_alloc(M_WAITOK);
1685 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1686 SYSCTL_CHILDREN(rack_counters),
1687 OID_AUTO, "persist_sends", CTLFLAG_RD,
1688 &rack_persists_sends,
1689 "Number of times we sent a persist probe");
1690 rack_persists_acks = counter_u64_alloc(M_WAITOK);
1691 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1692 SYSCTL_CHILDREN(rack_counters),
1693 OID_AUTO, "persist_acks", CTLFLAG_RD,
1694 &rack_persists_acks,
1695 "Number of times a persist probe was acked");
1696 rack_persists_loss = counter_u64_alloc(M_WAITOK);
1697 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1698 SYSCTL_CHILDREN(rack_counters),
1699 OID_AUTO, "persist_loss", CTLFLAG_RD,
1700 &rack_persists_loss,
1701 "Number of times we detected a lost persist probe (no ack)");
1702 rack_persists_lost_ends = counter_u64_alloc(M_WAITOK);
1703 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1704 SYSCTL_CHILDREN(rack_counters),
1705 OID_AUTO, "persist_loss_ends", CTLFLAG_RD,
1706 &rack_persists_lost_ends,
1707 "Number of lost persist probe (no ack) that the run ended with a PERSIST abort");
1709 rack_adjust_map_bw = counter_u64_alloc(M_WAITOK);
1710 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1711 SYSCTL_CHILDREN(rack_counters),
1712 OID_AUTO, "map_adjust_req", CTLFLAG_RD,
1713 &rack_adjust_map_bw,
1714 "Number of times we hit the case where the sb went up and down on a sendmap entry");
1716 rack_multi_single_eq = counter_u64_alloc(M_WAITOK);
1717 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1718 SYSCTL_CHILDREN(rack_counters),
1719 OID_AUTO, "cmp_ack_equiv", CTLFLAG_RD,
1720 &rack_multi_single_eq,
1721 "Number of compressed acks total represented");
1722 rack_proc_non_comp_ack = counter_u64_alloc(M_WAITOK);
1723 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1724 SYSCTL_CHILDREN(rack_counters),
1725 OID_AUTO, "cmp_ack_not", CTLFLAG_RD,
1726 &rack_proc_non_comp_ack,
1727 "Number of non compresseds acks that we processed");
1730 rack_sack_proc_all = counter_u64_alloc(M_WAITOK);
1731 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1732 SYSCTL_CHILDREN(rack_counters),
1733 OID_AUTO, "sack_long", CTLFLAG_RD,
1734 &rack_sack_proc_all,
1735 "Total times we had to walk whole list for sack processing");
1736 rack_sack_proc_restart = counter_u64_alloc(M_WAITOK);
1737 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1738 SYSCTL_CHILDREN(rack_counters),
1739 OID_AUTO, "sack_restart", CTLFLAG_RD,
1740 &rack_sack_proc_restart,
1741 "Total times we had to walk whole list due to a restart");
1742 rack_sack_proc_short = counter_u64_alloc(M_WAITOK);
1743 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1744 SYSCTL_CHILDREN(rack_counters),
1745 OID_AUTO, "sack_short", CTLFLAG_RD,
1746 &rack_sack_proc_short,
1747 "Total times we took shortcut for sack processing");
1748 rack_sack_skipped_acked = counter_u64_alloc(M_WAITOK);
1749 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1750 SYSCTL_CHILDREN(rack_attack),
1751 OID_AUTO, "skipacked", CTLFLAG_RD,
1752 &rack_sack_skipped_acked,
1753 "Total number of times we skipped previously sacked");
1754 rack_sack_splits = counter_u64_alloc(M_WAITOK);
1755 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1756 SYSCTL_CHILDREN(rack_attack),
1757 OID_AUTO, "ofsplit", CTLFLAG_RD,
1759 "Total number of times we did the old fashion tree split");
1760 rack_input_idle_reduces = counter_u64_alloc(M_WAITOK);
1761 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1762 SYSCTL_CHILDREN(rack_counters),
1763 OID_AUTO, "idle_reduce_oninput", CTLFLAG_RD,
1764 &rack_input_idle_reduces,
1765 "Total number of idle reductions on input");
1766 rack_collapsed_win_seen = counter_u64_alloc(M_WAITOK);
1767 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1768 SYSCTL_CHILDREN(rack_counters),
1769 OID_AUTO, "collapsed_win_seen", CTLFLAG_RD,
1770 &rack_collapsed_win_seen,
1771 "Total number of collapsed window events seen (where our window shrinks)");
1773 rack_collapsed_win = counter_u64_alloc(M_WAITOK);
1774 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1775 SYSCTL_CHILDREN(rack_counters),
1776 OID_AUTO, "collapsed_win", CTLFLAG_RD,
1777 &rack_collapsed_win,
1778 "Total number of collapsed window events where we mark packets");
1779 rack_collapsed_win_rxt = counter_u64_alloc(M_WAITOK);
1780 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1781 SYSCTL_CHILDREN(rack_counters),
1782 OID_AUTO, "collapsed_win_rxt", CTLFLAG_RD,
1783 &rack_collapsed_win_rxt,
1784 "Total number of packets that were retransmitted");
1785 rack_collapsed_win_rxt_bytes = counter_u64_alloc(M_WAITOK);
1786 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1787 SYSCTL_CHILDREN(rack_counters),
1788 OID_AUTO, "collapsed_win_bytes", CTLFLAG_RD,
1789 &rack_collapsed_win_rxt_bytes,
1790 "Total number of bytes that were retransmitted");
1791 rack_try_scwnd = counter_u64_alloc(M_WAITOK);
1792 SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx,
1793 SYSCTL_CHILDREN(rack_counters),
1794 OID_AUTO, "tried_scwnd", CTLFLAG_RD,
1796 "Total number of scwnd attempts");
1797 COUNTER_ARRAY_ALLOC(rack_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK);
1798 SYSCTL_ADD_COUNTER_U64_ARRAY(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root),
1799 OID_AUTO, "outsize", CTLFLAG_RD,
1800 rack_out_size, TCP_MSS_ACCT_SIZE, "MSS send sizes");
1801 COUNTER_ARRAY_ALLOC(rack_opts_arry, RACK_OPTS_SIZE, M_WAITOK);
1802 SYSCTL_ADD_COUNTER_U64_ARRAY(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root),
1803 OID_AUTO, "opts", CTLFLAG_RD,
1804 rack_opts_arry, RACK_OPTS_SIZE, "RACK Option Stats");
1805 SYSCTL_ADD_PROC(&rack_sysctl_ctx,
1806 SYSCTL_CHILDREN(rack_sysctl_root),
1807 OID_AUTO, "clear", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE,
1808 &rack_clear_counter, 0, sysctl_rack_clear, "IU", "Clear counters");
1812 rb_map_cmp(struct rack_sendmap *b, struct rack_sendmap *a)
1814 if (SEQ_GEQ(b->r_start, a->r_start) &&
1815 SEQ_LT(b->r_start, a->r_end)) {
1817 * The entry b is within the
1819 * a -- |-------------|
1824 * b -- |-----------|
1827 } else if (SEQ_GEQ(b->r_start, a->r_end)) {
1829 * b falls as either the next
1830 * sequence block after a so a
1831 * is said to be smaller than b.
1841 * Whats left is where a is
1842 * larger than b. i.e:
1846 * b -- |--------------|
1851 RB_PROTOTYPE(rack_rb_tree_head, rack_sendmap, r_next, rb_map_cmp);
1852 RB_GENERATE(rack_rb_tree_head, rack_sendmap, r_next, rb_map_cmp);
1855 rc_init_window(struct tcp_rack *rack)
1859 if (rack->rc_init_win == 0) {
1861 * Nothing set by the user, use the system stack
1864 return (tcp_compute_initwnd(tcp_maxseg(rack->rc_tp)));
1866 win = ctf_fixed_maxseg(rack->rc_tp) * rack->rc_init_win;
1871 rack_get_fixed_pacing_bw(struct tcp_rack *rack)
1873 if (IN_FASTRECOVERY(rack->rc_tp->t_flags))
1874 return (rack->r_ctl.rc_fixed_pacing_rate_rec);
1875 else if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh)
1876 return (rack->r_ctl.rc_fixed_pacing_rate_ss);
1878 return (rack->r_ctl.rc_fixed_pacing_rate_ca);
1882 rack_get_bw(struct tcp_rack *rack)
1884 if (rack->use_fixed_rate) {
1885 /* Return the fixed pacing rate */
1886 return (rack_get_fixed_pacing_bw(rack));
1888 if (rack->r_ctl.gp_bw == 0) {
1890 * We have yet no b/w measurement,
1891 * if we have a user set initial bw
1892 * return it. If we don't have that and
1893 * we have an srtt, use the tcp IW (10) to
1894 * calculate a fictional b/w over the SRTT
1895 * which is more or less a guess. Note
1896 * we don't use our IW from rack on purpose
1897 * so if we have like IW=30, we are not
1898 * calculating a "huge" b/w.
1901 if (rack->r_ctl.init_rate)
1902 return (rack->r_ctl.init_rate);
1904 /* Has the user set a max peak rate? */
1905 #ifdef NETFLIX_PEAKRATE
1906 if (rack->rc_tp->t_maxpeakrate)
1907 return (rack->rc_tp->t_maxpeakrate);
1909 /* Ok lets come up with the IW guess, if we have a srtt */
1910 if (rack->rc_tp->t_srtt == 0) {
1912 * Go with old pacing method
1913 * i.e. burst mitigation only.
1917 /* Ok lets get the initial TCP win (not racks) */
1918 bw = tcp_compute_initwnd(tcp_maxseg(rack->rc_tp));
1919 srtt = (uint64_t)rack->rc_tp->t_srtt;
1920 bw *= (uint64_t)USECS_IN_SECOND;
1922 if (rack->r_ctl.bw_rate_cap && (bw > rack->r_ctl.bw_rate_cap))
1923 bw = rack->r_ctl.bw_rate_cap;
1928 if (rack->r_ctl.num_measurements >= RACK_REQ_AVG) {
1929 /* Averaging is done, we can return the value */
1930 bw = rack->r_ctl.gp_bw;
1932 /* Still doing initial average must calculate */
1933 bw = rack->r_ctl.gp_bw / rack->r_ctl.num_measurements;
1935 #ifdef NETFLIX_PEAKRATE
1936 if ((rack->rc_tp->t_maxpeakrate) &&
1937 (bw > rack->rc_tp->t_maxpeakrate)) {
1938 /* The user has set a peak rate to pace at
1939 * don't allow us to pace faster than that.
1941 return (rack->rc_tp->t_maxpeakrate);
1944 if (rack->r_ctl.bw_rate_cap && (bw > rack->r_ctl.bw_rate_cap))
1945 bw = rack->r_ctl.bw_rate_cap;
1951 rack_get_output_gain(struct tcp_rack *rack, struct rack_sendmap *rsm)
1953 if (rack->use_fixed_rate) {
1955 } else if (rack->in_probe_rtt && (rsm == NULL))
1956 return (rack->r_ctl.rack_per_of_gp_probertt);
1957 else if ((IN_FASTRECOVERY(rack->rc_tp->t_flags) &&
1958 rack->r_ctl.rack_per_of_gp_rec)) {
1960 /* a retransmission always use the recovery rate */
1961 return (rack->r_ctl.rack_per_of_gp_rec);
1962 } else if (rack->rack_rec_nonrxt_use_cr) {
1963 /* Directed to use the configured rate */
1964 goto configured_rate;
1965 } else if (rack->rack_no_prr &&
1966 (rack->r_ctl.rack_per_of_gp_rec > 100)) {
1967 /* No PRR, lets just use the b/w estimate only */
1971 * Here we may have a non-retransmit but we
1972 * have no overrides, so just use the recovery
1973 * rate (prr is in effect).
1975 return (rack->r_ctl.rack_per_of_gp_rec);
1979 /* For the configured rate we look at our cwnd vs the ssthresh */
1980 if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh)
1981 return (rack->r_ctl.rack_per_of_gp_ss);
1983 return (rack->r_ctl.rack_per_of_gp_ca);
1987 rack_log_dsack_event(struct tcp_rack *rack, uint8_t mod, uint32_t flex4, uint32_t flex5, uint32_t flex6)
1990 * Types of logs (mod value)
1991 * 1 = dsack_persists reduced by 1 via T-O or fast recovery exit.
1992 * 2 = a dsack round begins, persist is reset to 16.
1993 * 3 = a dsack round ends
1994 * 4 = Dsack option increases rack rtt flex5 is the srtt input, flex6 is thresh
1995 * 5 = Socket option set changing the control flags rc_rack_tmr_std_based, rc_rack_use_dsack
1996 * 6 = Final rack rtt, flex4 is srtt and flex6 is final limited thresh.
1998 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
1999 union tcp_log_stackspecific log;
2002 memset(&log, 0, sizeof(log));
2003 log.u_bbr.flex1 = rack->rc_rack_tmr_std_based;
2004 log.u_bbr.flex1 <<= 1;
2005 log.u_bbr.flex1 |= rack->rc_rack_use_dsack;
2006 log.u_bbr.flex1 <<= 1;
2007 log.u_bbr.flex1 |= rack->rc_dsack_round_seen;
2008 log.u_bbr.flex2 = rack->r_ctl.dsack_round_end;
2009 log.u_bbr.flex3 = rack->r_ctl.num_dsack;
2010 log.u_bbr.flex4 = flex4;
2011 log.u_bbr.flex5 = flex5;
2012 log.u_bbr.flex6 = flex6;
2013 log.u_bbr.flex7 = rack->r_ctl.dsack_persist;
2014 log.u_bbr.flex8 = mod;
2015 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2016 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2017 &rack->rc_inp->inp_socket->so_rcv,
2018 &rack->rc_inp->inp_socket->so_snd,
2019 RACK_DSACK_HANDLING, 0,
2020 0, &log, false, &tv);
2025 rack_log_hdwr_pacing(struct tcp_rack *rack,
2026 uint64_t rate, uint64_t hw_rate, int line,
2027 int error, uint16_t mod)
2029 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2030 union tcp_log_stackspecific log;
2032 const struct ifnet *ifp;
2034 memset(&log, 0, sizeof(log));
2035 log.u_bbr.flex1 = ((hw_rate >> 32) & 0x00000000ffffffff);
2036 log.u_bbr.flex2 = (hw_rate & 0x00000000ffffffff);
2037 if (rack->r_ctl.crte) {
2038 ifp = rack->r_ctl.crte->ptbl->rs_ifp;
2039 } else if (rack->rc_inp->inp_route.ro_nh &&
2040 rack->rc_inp->inp_route.ro_nh->nh_ifp) {
2041 ifp = rack->rc_inp->inp_route.ro_nh->nh_ifp;
2045 log.u_bbr.flex3 = (((uint64_t)ifp >> 32) & 0x00000000ffffffff);
2046 log.u_bbr.flex4 = ((uint64_t)ifp & 0x00000000ffffffff);
2048 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2049 log.u_bbr.bw_inuse = rate;
2050 log.u_bbr.flex5 = line;
2051 log.u_bbr.flex6 = error;
2052 log.u_bbr.flex7 = mod;
2053 log.u_bbr.applimited = rack->r_ctl.rc_pace_max_segs;
2054 log.u_bbr.flex8 = rack->use_fixed_rate;
2055 log.u_bbr.flex8 <<= 1;
2056 log.u_bbr.flex8 |= rack->rack_hdrw_pacing;
2057 log.u_bbr.pkts_out = rack->rc_tp->t_maxseg;
2058 log.u_bbr.delRate = rack->r_ctl.crte_prev_rate;
2059 if (rack->r_ctl.crte)
2060 log.u_bbr.cur_del_rate = rack->r_ctl.crte->rate;
2062 log.u_bbr.cur_del_rate = 0;
2063 log.u_bbr.rttProp = rack->r_ctl.last_hw_bw_req;
2064 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2065 &rack->rc_inp->inp_socket->so_rcv,
2066 &rack->rc_inp->inp_socket->so_snd,
2067 BBR_LOG_HDWR_PACE, 0,
2068 0, &log, false, &tv);
2073 rack_get_output_bw(struct tcp_rack *rack, uint64_t bw, struct rack_sendmap *rsm, int *capped)
2076 * We allow rack_per_of_gp_xx to dictate our bw rate we want.
2078 uint64_t bw_est, high_rate;
2081 gain = (uint64_t)rack_get_output_gain(rack, rsm);
2083 bw_est /= (uint64_t)100;
2084 /* Never fall below the minimum (def 64kbps) */
2085 if (bw_est < RACK_MIN_BW)
2086 bw_est = RACK_MIN_BW;
2087 if (rack->r_rack_hw_rate_caps) {
2088 /* Rate caps are in place */
2089 if (rack->r_ctl.crte != NULL) {
2090 /* We have a hdwr rate already */
2091 high_rate = tcp_hw_highest_rate(rack->r_ctl.crte);
2092 if (bw_est >= high_rate) {
2093 /* We are capping bw at the highest rate table entry */
2094 rack_log_hdwr_pacing(rack,
2095 bw_est, high_rate, __LINE__,
2101 } else if ((rack->rack_hdrw_pacing == 0) &&
2102 (rack->rack_hdw_pace_ena) &&
2103 (rack->rack_attempt_hdwr_pace == 0) &&
2104 (rack->rc_inp->inp_route.ro_nh != NULL) &&
2105 (rack->rc_inp->inp_route.ro_nh->nh_ifp != NULL)) {
2107 * Special case, we have not yet attempted hardware
2108 * pacing, and yet we may, when we do, find out if we are
2109 * above the highest rate. We need to know the maxbw for the interface
2110 * in question (if it supports ratelimiting). We get back
2111 * a 0, if the interface is not found in the RL lists.
2113 high_rate = tcp_hw_highest_rate_ifp(rack->rc_inp->inp_route.ro_nh->nh_ifp, rack->rc_inp);
2115 /* Yep, we have a rate is it above this rate? */
2116 if (bw_est > high_rate) {
2128 rack_log_retran_reason(struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t tsused, uint32_t thresh, int mod)
2130 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2131 union tcp_log_stackspecific log;
2134 if ((mod != 1) && (rack_verbose_logging == 0)) {
2136 * We get 3 values currently for mod
2137 * 1 - We are retransmitting and this tells the reason.
2138 * 2 - We are clearing a dup-ack count.
2139 * 3 - We are incrementing a dup-ack count.
2141 * The clear/increment are only logged
2142 * if you have BBverbose on.
2146 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2147 log.u_bbr.flex1 = tsused;
2148 log.u_bbr.flex2 = thresh;
2149 log.u_bbr.flex3 = rsm->r_flags;
2150 log.u_bbr.flex4 = rsm->r_dupack;
2151 log.u_bbr.flex5 = rsm->r_start;
2152 log.u_bbr.flex6 = rsm->r_end;
2153 log.u_bbr.flex8 = mod;
2154 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2155 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2156 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2157 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2158 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2159 log.u_bbr.pacing_gain = rack->r_must_retran;
2160 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2161 &rack->rc_inp->inp_socket->so_rcv,
2162 &rack->rc_inp->inp_socket->so_snd,
2163 BBR_LOG_SETTINGS_CHG, 0,
2164 0, &log, false, &tv);
2169 rack_log_to_start(struct tcp_rack *rack, uint32_t cts, uint32_t to, int32_t slot, uint8_t which)
2171 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2172 union tcp_log_stackspecific log;
2175 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2176 log.u_bbr.flex1 = rack->rc_tp->t_srtt;
2177 log.u_bbr.flex2 = to;
2178 log.u_bbr.flex3 = rack->r_ctl.rc_hpts_flags;
2179 log.u_bbr.flex4 = slot;
2180 log.u_bbr.flex5 = rack->rc_inp->inp_hptsslot;
2181 log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
2182 log.u_bbr.flex7 = rack->rc_in_persist;
2183 log.u_bbr.flex8 = which;
2184 if (rack->rack_no_prr)
2185 log.u_bbr.pkts_out = 0;
2187 log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
2188 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2189 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2190 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2191 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2192 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2193 log.u_bbr.pacing_gain = rack->r_must_retran;
2194 log.u_bbr.cwnd_gain = rack->rc_has_collapsed;
2195 log.u_bbr.lt_epoch = rack->rc_tp->t_rxtshift;
2196 log.u_bbr.lost = rack_rto_min;
2197 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2198 &rack->rc_inp->inp_socket->so_rcv,
2199 &rack->rc_inp->inp_socket->so_snd,
2200 BBR_LOG_TIMERSTAR, 0,
2201 0, &log, false, &tv);
2206 rack_log_to_event(struct tcp_rack *rack, int32_t to_num, struct rack_sendmap *rsm)
2208 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2209 union tcp_log_stackspecific log;
2212 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2213 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2214 log.u_bbr.flex8 = to_num;
2215 log.u_bbr.flex1 = rack->r_ctl.rc_rack_min_rtt;
2216 log.u_bbr.flex2 = rack->rc_rack_rtt;
2218 log.u_bbr.flex3 = 0;
2220 log.u_bbr.flex3 = rsm->r_end - rsm->r_start;
2221 if (rack->rack_no_prr)
2222 log.u_bbr.flex5 = 0;
2224 log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
2225 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2226 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2227 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2228 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2229 log.u_bbr.pacing_gain = rack->r_must_retran;
2230 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2231 &rack->rc_inp->inp_socket->so_rcv,
2232 &rack->rc_inp->inp_socket->so_snd,
2234 0, &log, false, &tv);
2239 rack_log_map_chg(struct tcpcb *tp, struct tcp_rack *rack,
2240 struct rack_sendmap *prev,
2241 struct rack_sendmap *rsm,
2242 struct rack_sendmap *next,
2243 int flag, uint32_t th_ack, int line)
2245 if (rack_verbose_logging && (tp->t_logstate != TCP_LOG_STATE_OFF)) {
2246 union tcp_log_stackspecific log;
2249 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2250 log.u_bbr.flex8 = flag;
2251 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2252 log.u_bbr.cur_del_rate = (uint64_t)prev;
2253 log.u_bbr.delRate = (uint64_t)rsm;
2254 log.u_bbr.rttProp = (uint64_t)next;
2255 log.u_bbr.flex7 = 0;
2257 log.u_bbr.flex1 = prev->r_start;
2258 log.u_bbr.flex2 = prev->r_end;
2259 log.u_bbr.flex7 |= 0x4;
2262 log.u_bbr.flex3 = rsm->r_start;
2263 log.u_bbr.flex4 = rsm->r_end;
2264 log.u_bbr.flex7 |= 0x2;
2267 log.u_bbr.flex5 = next->r_start;
2268 log.u_bbr.flex6 = next->r_end;
2269 log.u_bbr.flex7 |= 0x1;
2271 log.u_bbr.applimited = line;
2272 log.u_bbr.pkts_out = th_ack;
2273 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2274 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2275 if (rack->rack_no_prr)
2278 log.u_bbr.lost = rack->r_ctl.rc_prr_sndcnt;
2279 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2280 &rack->rc_inp->inp_socket->so_rcv,
2281 &rack->rc_inp->inp_socket->so_snd,
2283 0, &log, false, &tv);
2288 rack_log_rtt_upd(struct tcpcb *tp, struct tcp_rack *rack, uint32_t t, uint32_t len,
2289 struct rack_sendmap *rsm, int conf)
2291 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
2292 union tcp_log_stackspecific log;
2294 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2295 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2296 log.u_bbr.flex1 = t;
2297 log.u_bbr.flex2 = len;
2298 log.u_bbr.flex3 = rack->r_ctl.rc_rack_min_rtt;
2299 log.u_bbr.flex4 = rack->r_ctl.rack_rs.rs_rtt_lowest;
2300 log.u_bbr.flex5 = rack->r_ctl.rack_rs.rs_rtt_highest;
2301 log.u_bbr.flex6 = rack->r_ctl.rack_rs.rs_us_rtrcnt;
2302 log.u_bbr.flex7 = conf;
2303 log.u_bbr.rttProp = (uint64_t)rack->r_ctl.rack_rs.rs_rtt_tot;
2304 log.u_bbr.flex8 = rack->r_ctl.rc_rate_sample_method;
2305 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2306 log.u_bbr.delivered = rack->r_ctl.rack_rs.rs_us_rtrcnt;
2307 log.u_bbr.pkts_out = rack->r_ctl.rack_rs.rs_flags;
2308 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2310 log.u_bbr.pkt_epoch = rsm->r_start;
2311 log.u_bbr.lost = rsm->r_end;
2312 log.u_bbr.cwnd_gain = rsm->r_rtr_cnt;
2313 /* We loose any upper of the 24 bits */
2314 log.u_bbr.pacing_gain = (uint16_t)rsm->r_flags;
2317 log.u_bbr.pkt_epoch = rack->rc_tp->iss;
2319 log.u_bbr.cwnd_gain = 0;
2320 log.u_bbr.pacing_gain = 0;
2322 /* Write out general bits of interest rrs here */
2323 log.u_bbr.use_lt_bw = rack->rc_highly_buffered;
2324 log.u_bbr.use_lt_bw <<= 1;
2325 log.u_bbr.use_lt_bw |= rack->forced_ack;
2326 log.u_bbr.use_lt_bw <<= 1;
2327 log.u_bbr.use_lt_bw |= rack->rc_gp_dyn_mul;
2328 log.u_bbr.use_lt_bw <<= 1;
2329 log.u_bbr.use_lt_bw |= rack->in_probe_rtt;
2330 log.u_bbr.use_lt_bw <<= 1;
2331 log.u_bbr.use_lt_bw |= rack->measure_saw_probe_rtt;
2332 log.u_bbr.use_lt_bw <<= 1;
2333 log.u_bbr.use_lt_bw |= rack->app_limited_needs_set;
2334 log.u_bbr.use_lt_bw <<= 1;
2335 log.u_bbr.use_lt_bw |= rack->rc_gp_filled;
2336 log.u_bbr.use_lt_bw <<= 1;
2337 log.u_bbr.use_lt_bw |= rack->rc_dragged_bottom;
2338 log.u_bbr.applimited = rack->r_ctl.rc_target_probertt_flight;
2339 log.u_bbr.epoch = rack->r_ctl.rc_time_probertt_starts;
2340 log.u_bbr.lt_epoch = rack->r_ctl.rc_time_probertt_entered;
2341 log.u_bbr.cur_del_rate = rack->r_ctl.rc_lower_rtt_us_cts;
2342 log.u_bbr.delRate = rack->r_ctl.rc_gp_srtt;
2343 log.u_bbr.bw_inuse = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
2344 log.u_bbr.bw_inuse <<= 32;
2346 log.u_bbr.bw_inuse |= ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]);
2347 TCP_LOG_EVENTP(tp, NULL,
2348 &rack->rc_inp->inp_socket->so_rcv,
2349 &rack->rc_inp->inp_socket->so_snd,
2351 0, &log, false, &tv);
2358 rack_log_rtt_sample(struct tcp_rack *rack, uint32_t rtt)
2361 * Log the rtt sample we are
2362 * applying to the srtt algorithm in
2365 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2366 union tcp_log_stackspecific log;
2369 /* Convert our ms to a microsecond */
2370 memset(&log, 0, sizeof(log));
2371 log.u_bbr.flex1 = rtt;
2372 log.u_bbr.flex2 = rack->r_ctl.ack_count;
2373 log.u_bbr.flex3 = rack->r_ctl.sack_count;
2374 log.u_bbr.flex4 = rack->r_ctl.sack_noextra_move;
2375 log.u_bbr.flex5 = rack->r_ctl.sack_moved_extra;
2376 log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
2377 log.u_bbr.flex7 = 1;
2378 log.u_bbr.flex8 = rack->sack_attack_disable;
2379 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2380 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2381 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2382 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2383 log.u_bbr.pacing_gain = rack->r_must_retran;
2385 * We capture in delRate the upper 32 bits as
2386 * the confidence level we had declared, and the
2387 * lower 32 bits as the actual RTT using the arrival
2390 log.u_bbr.delRate = rack->r_ctl.rack_rs.confidence;
2391 log.u_bbr.delRate <<= 32;
2392 log.u_bbr.delRate |= rack->r_ctl.rack_rs.rs_us_rtt;
2393 /* Lets capture all the things that make up t_rtxcur */
2394 log.u_bbr.applimited = rack_rto_min;
2395 log.u_bbr.epoch = rack_rto_max;
2396 log.u_bbr.lt_epoch = rack->r_ctl.timer_slop;
2397 log.u_bbr.lost = rack_rto_min;
2398 log.u_bbr.pkt_epoch = TICKS_2_USEC(tcp_rexmit_slop);
2399 log.u_bbr.rttProp = RACK_REXMTVAL(rack->rc_tp);
2400 log.u_bbr.bw_inuse = rack->r_ctl.act_rcv_time.tv_sec;
2401 log.u_bbr.bw_inuse *= HPTS_USEC_IN_SEC;
2402 log.u_bbr.bw_inuse += rack->r_ctl.act_rcv_time.tv_usec;
2403 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2404 &rack->rc_inp->inp_socket->so_rcv,
2405 &rack->rc_inp->inp_socket->so_snd,
2407 0, &log, false, &tv);
2412 rack_log_rtt_sample_calc(struct tcp_rack *rack, uint32_t rtt, uint32_t send_time, uint32_t ack_time, int where)
2414 if (rack_verbose_logging && (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
2415 union tcp_log_stackspecific log;
2418 /* Convert our ms to a microsecond */
2419 memset(&log, 0, sizeof(log));
2420 log.u_bbr.flex1 = rtt;
2421 log.u_bbr.flex2 = send_time;
2422 log.u_bbr.flex3 = ack_time;
2423 log.u_bbr.flex4 = where;
2424 log.u_bbr.flex7 = 2;
2425 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2426 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2427 &rack->rc_inp->inp_socket->so_rcv,
2428 &rack->rc_inp->inp_socket->so_snd,
2430 0, &log, false, &tv);
2437 rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, int event, int line)
2439 if (rack_verbose_logging && (tp->t_logstate != TCP_LOG_STATE_OFF)) {
2440 union tcp_log_stackspecific log;
2443 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2444 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2445 log.u_bbr.flex1 = line;
2446 log.u_bbr.flex2 = tick;
2447 log.u_bbr.flex3 = tp->t_maxunacktime;
2448 log.u_bbr.flex4 = tp->t_acktime;
2449 log.u_bbr.flex8 = event;
2450 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2451 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2452 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2453 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2454 log.u_bbr.pacing_gain = rack->r_must_retran;
2455 TCP_LOG_EVENTP(tp, NULL,
2456 &rack->rc_inp->inp_socket->so_rcv,
2457 &rack->rc_inp->inp_socket->so_snd,
2458 BBR_LOG_PROGRESS, 0,
2459 0, &log, false, &tv);
2464 rack_log_type_bbrsnd(struct tcp_rack *rack, uint32_t len, uint32_t slot, uint32_t cts, struct timeval *tv)
2466 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2467 union tcp_log_stackspecific log;
2469 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2470 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2471 log.u_bbr.flex1 = slot;
2472 if (rack->rack_no_prr)
2473 log.u_bbr.flex2 = 0;
2475 log.u_bbr.flex2 = rack->r_ctl.rc_prr_sndcnt;
2476 log.u_bbr.flex7 = (0x0000ffff & rack->r_ctl.rc_hpts_flags);
2477 log.u_bbr.flex8 = rack->rc_in_persist;
2478 log.u_bbr.timeStamp = cts;
2479 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2480 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2481 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2482 log.u_bbr.pacing_gain = rack->r_must_retran;
2483 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2484 &rack->rc_inp->inp_socket->so_rcv,
2485 &rack->rc_inp->inp_socket->so_snd,
2487 0, &log, false, tv);
2492 rack_log_doseg_done(struct tcp_rack *rack, uint32_t cts, int32_t nxt_pkt, int32_t did_out, int way_out, int nsegs)
2494 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2495 union tcp_log_stackspecific log;
2498 memset(&log, 0, sizeof(log));
2499 log.u_bbr.flex1 = did_out;
2500 log.u_bbr.flex2 = nxt_pkt;
2501 log.u_bbr.flex3 = way_out;
2502 log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
2503 if (rack->rack_no_prr)
2504 log.u_bbr.flex5 = 0;
2506 log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
2507 log.u_bbr.flex6 = nsegs;
2508 log.u_bbr.applimited = rack->r_ctl.rc_pace_min_segs;
2509 log.u_bbr.flex7 = rack->rc_ack_can_sendout_data; /* Do we have ack-can-send set */
2510 log.u_bbr.flex7 <<= 1;
2511 log.u_bbr.flex7 |= rack->r_fast_output; /* is fast output primed */
2512 log.u_bbr.flex7 <<= 1;
2513 log.u_bbr.flex7 |= rack->r_wanted_output; /* Do we want output */
2514 log.u_bbr.flex8 = rack->rc_in_persist;
2515 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2516 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2517 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2518 log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
2519 log.u_bbr.use_lt_bw <<= 1;
2520 log.u_bbr.use_lt_bw |= rack->r_might_revert;
2521 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2522 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2523 log.u_bbr.pacing_gain = rack->r_must_retran;
2524 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2525 &rack->rc_inp->inp_socket->so_rcv,
2526 &rack->rc_inp->inp_socket->so_snd,
2527 BBR_LOG_DOSEG_DONE, 0,
2528 0, &log, false, &tv);
2533 rack_log_type_pacing_sizes(struct tcpcb *tp, struct tcp_rack *rack, uint32_t arg1, uint32_t arg2, uint32_t arg3, uint8_t frm)
2535 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
2536 union tcp_log_stackspecific log;
2539 memset(&log, 0, sizeof(log));
2540 log.u_bbr.flex1 = rack->r_ctl.rc_pace_min_segs;
2541 log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
2542 log.u_bbr.flex4 = arg1;
2543 log.u_bbr.flex5 = arg2;
2544 log.u_bbr.flex6 = arg3;
2545 log.u_bbr.flex8 = frm;
2546 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2547 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2548 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2549 log.u_bbr.applimited = rack->r_ctl.rc_sacked;
2550 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2551 log.u_bbr.pacing_gain = rack->r_must_retran;
2552 TCP_LOG_EVENTP(tp, NULL, &tptosocket(tp)->so_rcv,
2553 &tptosocket(tp)->so_snd,
2554 TCP_HDWR_PACE_SIZE, 0, 0, &log, false, &tv);
2559 rack_log_type_just_return(struct tcp_rack *rack, uint32_t cts, uint32_t tlen, uint32_t slot,
2560 uint8_t hpts_calling, int reason, uint32_t cwnd_to_use)
2562 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2563 union tcp_log_stackspecific log;
2566 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2567 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2568 log.u_bbr.flex1 = slot;
2569 log.u_bbr.flex2 = rack->r_ctl.rc_hpts_flags;
2570 log.u_bbr.flex4 = reason;
2571 if (rack->rack_no_prr)
2572 log.u_bbr.flex5 = 0;
2574 log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
2575 log.u_bbr.flex7 = hpts_calling;
2576 log.u_bbr.flex8 = rack->rc_in_persist;
2577 log.u_bbr.lt_epoch = cwnd_to_use;
2578 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2579 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2580 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2581 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2582 log.u_bbr.pacing_gain = rack->r_must_retran;
2583 log.u_bbr.cwnd_gain = rack->rc_has_collapsed;
2584 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2585 &rack->rc_inp->inp_socket->so_rcv,
2586 &rack->rc_inp->inp_socket->so_snd,
2588 tlen, &log, false, &tv);
2593 rack_log_to_cancel(struct tcp_rack *rack, int32_t hpts_removed, int line, uint32_t us_cts,
2594 struct timeval *tv, uint32_t flags_on_entry)
2596 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2597 union tcp_log_stackspecific log;
2599 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2600 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
2601 log.u_bbr.flex1 = line;
2602 log.u_bbr.flex2 = rack->r_ctl.rc_last_output_to;
2603 log.u_bbr.flex3 = flags_on_entry;
2604 log.u_bbr.flex4 = us_cts;
2605 if (rack->rack_no_prr)
2606 log.u_bbr.flex5 = 0;
2608 log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt;
2609 log.u_bbr.flex6 = rack->rc_tp->t_rxtcur;
2610 log.u_bbr.flex7 = hpts_removed;
2611 log.u_bbr.flex8 = 1;
2612 log.u_bbr.applimited = rack->r_ctl.rc_hpts_flags;
2613 log.u_bbr.timeStamp = us_cts;
2614 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2615 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2616 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2617 log.u_bbr.pacing_gain = rack->r_must_retran;
2618 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2619 &rack->rc_inp->inp_socket->so_rcv,
2620 &rack->rc_inp->inp_socket->so_snd,
2621 BBR_LOG_TIMERCANC, 0,
2622 0, &log, false, tv);
2627 rack_log_alt_to_to_cancel(struct tcp_rack *rack,
2628 uint32_t flex1, uint32_t flex2,
2629 uint32_t flex3, uint32_t flex4,
2630 uint32_t flex5, uint32_t flex6,
2631 uint16_t flex7, uint8_t mod)
2633 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2634 union tcp_log_stackspecific log;
2638 /* No you can't use 1, its for the real to cancel */
2641 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2642 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2643 log.u_bbr.flex1 = flex1;
2644 log.u_bbr.flex2 = flex2;
2645 log.u_bbr.flex3 = flex3;
2646 log.u_bbr.flex4 = flex4;
2647 log.u_bbr.flex5 = flex5;
2648 log.u_bbr.flex6 = flex6;
2649 log.u_bbr.flex7 = flex7;
2650 log.u_bbr.flex8 = mod;
2651 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2652 &rack->rc_inp->inp_socket->so_rcv,
2653 &rack->rc_inp->inp_socket->so_snd,
2654 BBR_LOG_TIMERCANC, 0,
2655 0, &log, false, &tv);
2660 rack_log_to_processing(struct tcp_rack *rack, uint32_t cts, int32_t ret, int32_t timers)
2662 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2663 union tcp_log_stackspecific log;
2666 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2667 log.u_bbr.flex1 = timers;
2668 log.u_bbr.flex2 = ret;
2669 log.u_bbr.flex3 = rack->r_ctl.rc_timer_exp;
2670 log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
2671 log.u_bbr.flex5 = cts;
2672 if (rack->rack_no_prr)
2673 log.u_bbr.flex6 = 0;
2675 log.u_bbr.flex6 = rack->r_ctl.rc_prr_sndcnt;
2676 log.u_bbr.pkts_out = rack->r_ctl.rc_out_at_rto;
2677 log.u_bbr.delivered = rack->r_ctl.rc_snd_max_at_rto;
2678 log.u_bbr.pacing_gain = rack->r_must_retran;
2679 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2680 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2681 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2682 &rack->rc_inp->inp_socket->so_rcv,
2683 &rack->rc_inp->inp_socket->so_snd,
2684 BBR_LOG_TO_PROCESS, 0,
2685 0, &log, false, &tv);
2690 rack_log_to_prr(struct tcp_rack *rack, int frm, int orig_cwnd, int line)
2692 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2693 union tcp_log_stackspecific log;
2696 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2697 log.u_bbr.flex1 = rack->r_ctl.rc_prr_out;
2698 log.u_bbr.flex2 = rack->r_ctl.rc_prr_recovery_fs;
2699 if (rack->rack_no_prr)
2700 log.u_bbr.flex3 = 0;
2702 log.u_bbr.flex3 = rack->r_ctl.rc_prr_sndcnt;
2703 log.u_bbr.flex4 = rack->r_ctl.rc_prr_delivered;
2704 log.u_bbr.flex5 = rack->r_ctl.rc_sacked;
2705 log.u_bbr.flex6 = rack->r_ctl.rc_holes_rxt;
2706 log.u_bbr.flex7 = line;
2707 log.u_bbr.flex8 = frm;
2708 log.u_bbr.pkts_out = orig_cwnd;
2709 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2710 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2711 log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
2712 log.u_bbr.use_lt_bw <<= 1;
2713 log.u_bbr.use_lt_bw |= rack->r_might_revert;
2714 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2715 &rack->rc_inp->inp_socket->so_rcv,
2716 &rack->rc_inp->inp_socket->so_snd,
2718 0, &log, false, &tv);
2722 #ifdef NETFLIX_EXP_DETECTION
2724 rack_log_sad(struct tcp_rack *rack, int event)
2726 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
2727 union tcp_log_stackspecific log;
2730 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2731 log.u_bbr.flex1 = rack->r_ctl.sack_count;
2732 log.u_bbr.flex2 = rack->r_ctl.ack_count;
2733 log.u_bbr.flex3 = rack->r_ctl.sack_moved_extra;
2734 log.u_bbr.flex4 = rack->r_ctl.sack_noextra_move;
2735 log.u_bbr.flex5 = rack->r_ctl.rc_num_maps_alloced;
2736 log.u_bbr.flex6 = tcp_sack_to_ack_thresh;
2737 log.u_bbr.pkts_out = tcp_sack_to_move_thresh;
2738 log.u_bbr.lt_epoch = (tcp_force_detection << 8);
2739 log.u_bbr.lt_epoch |= rack->do_detection;
2740 log.u_bbr.applimited = tcp_map_minimum;
2741 log.u_bbr.flex7 = rack->sack_attack_disable;
2742 log.u_bbr.flex8 = event;
2743 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2744 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
2745 log.u_bbr.delivered = tcp_sad_decay_val;
2746 TCP_LOG_EVENTP(rack->rc_tp, NULL,
2747 &rack->rc_inp->inp_socket->so_rcv,
2748 &rack->rc_inp->inp_socket->so_snd,
2749 TCP_SAD_DETECTION, 0,
2750 0, &log, false, &tv);
2756 rack_counter_destroy(void)
2758 counter_u64_free(rack_fto_send);
2759 counter_u64_free(rack_fto_rsm_send);
2760 counter_u64_free(rack_nfto_resend);
2761 counter_u64_free(rack_hw_pace_init_fail);
2762 counter_u64_free(rack_hw_pace_lost);
2763 counter_u64_free(rack_non_fto_send);
2764 counter_u64_free(rack_extended_rfo);
2765 counter_u64_free(rack_ack_total);
2766 counter_u64_free(rack_express_sack);
2767 counter_u64_free(rack_sack_total);
2768 counter_u64_free(rack_move_none);
2769 counter_u64_free(rack_move_some);
2770 counter_u64_free(rack_sack_attacks_detected);
2771 counter_u64_free(rack_sack_attacks_reversed);
2772 counter_u64_free(rack_sack_used_next_merge);
2773 counter_u64_free(rack_sack_used_prev_merge);
2774 counter_u64_free(rack_tlp_tot);
2775 counter_u64_free(rack_tlp_newdata);
2776 counter_u64_free(rack_tlp_retran);
2777 counter_u64_free(rack_tlp_retran_bytes);
2778 counter_u64_free(rack_to_tot);
2779 counter_u64_free(rack_saw_enobuf);
2780 counter_u64_free(rack_saw_enobuf_hw);
2781 counter_u64_free(rack_saw_enetunreach);
2782 counter_u64_free(rack_hot_alloc);
2783 counter_u64_free(rack_to_alloc);
2784 counter_u64_free(rack_to_alloc_hard);
2785 counter_u64_free(rack_to_alloc_emerg);
2786 counter_u64_free(rack_to_alloc_limited);
2787 counter_u64_free(rack_alloc_limited_conns);
2788 counter_u64_free(rack_split_limited);
2789 counter_u64_free(rack_multi_single_eq);
2790 counter_u64_free(rack_proc_non_comp_ack);
2791 counter_u64_free(rack_sack_proc_all);
2792 counter_u64_free(rack_sack_proc_restart);
2793 counter_u64_free(rack_sack_proc_short);
2794 counter_u64_free(rack_sack_skipped_acked);
2795 counter_u64_free(rack_sack_splits);
2796 counter_u64_free(rack_input_idle_reduces);
2797 counter_u64_free(rack_collapsed_win);
2798 counter_u64_free(rack_collapsed_win_rxt);
2799 counter_u64_free(rack_collapsed_win_rxt_bytes);
2800 counter_u64_free(rack_collapsed_win_seen);
2801 counter_u64_free(rack_try_scwnd);
2802 counter_u64_free(rack_persists_sends);
2803 counter_u64_free(rack_persists_acks);
2804 counter_u64_free(rack_persists_loss);
2805 counter_u64_free(rack_persists_lost_ends);
2807 counter_u64_free(rack_adjust_map_bw);
2809 COUNTER_ARRAY_FREE(rack_out_size, TCP_MSS_ACCT_SIZE);
2810 COUNTER_ARRAY_FREE(rack_opts_arry, RACK_OPTS_SIZE);
2813 static struct rack_sendmap *
2814 rack_alloc(struct tcp_rack *rack)
2816 struct rack_sendmap *rsm;
2819 * First get the top of the list it in
2820 * theory is the "hottest" rsm we have,
2821 * possibly just freed by ack processing.
2823 if (rack->rc_free_cnt > rack_free_cache) {
2824 rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
2825 TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
2826 counter_u64_add(rack_hot_alloc, 1);
2827 rack->rc_free_cnt--;
2831 * Once we get under our free cache we probably
2832 * no longer have a "hot" one available. Lets
2835 rsm = uma_zalloc(rack_zone, M_NOWAIT);
2837 rack->r_ctl.rc_num_maps_alloced++;
2838 counter_u64_add(rack_to_alloc, 1);
2842 * Dig in to our aux rsm's (the last two) since
2843 * UMA failed to get us one.
2845 if (rack->rc_free_cnt) {
2846 counter_u64_add(rack_to_alloc_emerg, 1);
2847 rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
2848 TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
2849 rack->rc_free_cnt--;
2855 static struct rack_sendmap *
2856 rack_alloc_full_limit(struct tcp_rack *rack)
2858 if ((V_tcp_map_entries_limit > 0) &&
2859 (rack->do_detection == 0) &&
2860 (rack->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) {
2861 counter_u64_add(rack_to_alloc_limited, 1);
2862 if (!rack->alloc_limit_reported) {
2863 rack->alloc_limit_reported = 1;
2864 counter_u64_add(rack_alloc_limited_conns, 1);
2868 return (rack_alloc(rack));
2871 /* wrapper to allocate a sendmap entry, subject to a specific limit */
2872 static struct rack_sendmap *
2873 rack_alloc_limit(struct tcp_rack *rack, uint8_t limit_type)
2875 struct rack_sendmap *rsm;
2878 /* currently there is only one limit type */
2879 if (V_tcp_map_split_limit > 0 &&
2880 (rack->do_detection == 0) &&
2881 rack->r_ctl.rc_num_split_allocs >= V_tcp_map_split_limit) {
2882 counter_u64_add(rack_split_limited, 1);
2883 if (!rack->alloc_limit_reported) {
2884 rack->alloc_limit_reported = 1;
2885 counter_u64_add(rack_alloc_limited_conns, 1);
2891 /* allocate and mark in the limit type, if set */
2892 rsm = rack_alloc(rack);
2893 if (rsm != NULL && limit_type) {
2894 rsm->r_limit_type = limit_type;
2895 rack->r_ctl.rc_num_split_allocs++;
2901 rack_free(struct tcp_rack *rack, struct rack_sendmap *rsm)
2903 if (rsm->r_flags & RACK_APP_LIMITED) {
2904 if (rack->r_ctl.rc_app_limited_cnt > 0) {
2905 rack->r_ctl.rc_app_limited_cnt--;
2908 if (rsm->r_limit_type) {
2909 /* currently there is only one limit type */
2910 rack->r_ctl.rc_num_split_allocs--;
2912 if (rsm == rack->r_ctl.rc_first_appl) {
2913 if (rack->r_ctl.rc_app_limited_cnt == 0)
2914 rack->r_ctl.rc_first_appl = NULL;
2916 /* Follow the next one out */
2917 struct rack_sendmap fe;
2919 fe.r_start = rsm->r_nseq_appl;
2920 rack->r_ctl.rc_first_appl = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
2923 if (rsm == rack->r_ctl.rc_resend)
2924 rack->r_ctl.rc_resend = NULL;
2925 if (rsm == rack->r_ctl.rc_end_appl)
2926 rack->r_ctl.rc_end_appl = NULL;
2927 if (rack->r_ctl.rc_tlpsend == rsm)
2928 rack->r_ctl.rc_tlpsend = NULL;
2929 if (rack->r_ctl.rc_sacklast == rsm)
2930 rack->r_ctl.rc_sacklast = NULL;
2931 memset(rsm, 0, sizeof(struct rack_sendmap));
2932 TAILQ_INSERT_HEAD(&rack->r_ctl.rc_free, rsm, r_tnext);
2933 rack->rc_free_cnt++;
2937 rack_free_trim(struct tcp_rack *rack)
2939 struct rack_sendmap *rsm;
2942 * Free up all the tail entries until
2943 * we get our list down to the limit.
2945 while (rack->rc_free_cnt > rack_free_cache) {
2946 rsm = TAILQ_LAST(&rack->r_ctl.rc_free, rack_head);
2947 TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
2948 rack->rc_free_cnt--;
2949 uma_zfree(rack_zone, rsm);
2955 rack_get_measure_window(struct tcpcb *tp, struct tcp_rack *rack)
2957 uint64_t srtt, bw, len, tim;
2958 uint32_t segsiz, def_len, minl;
2960 segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
2961 def_len = rack_def_data_window * segsiz;
2962 if (rack->rc_gp_filled == 0) {
2964 * We have no measurement (IW is in flight?) so
2965 * we can only guess using our data_window sysctl
2966 * value (usually 20MSS).
2971 * Now we have a number of factors to consider.
2973 * 1) We have a desired BDP which is usually
2975 * 2) We have a minimum number of rtt's usually 1 SRTT
2976 * but we allow it too to be more.
2977 * 3) We want to make sure a measurement last N useconds (if
2978 * we have set rack_min_measure_usec.
2980 * We handle the first concern here by trying to create a data
2981 * window of max(rack_def_data_window, DesiredBDP). The
2982 * second concern we handle in not letting the measurement
2983 * window end normally until at least the required SRTT's
2984 * have gone by which is done further below in
2985 * rack_enough_for_measurement(). Finally the third concern
2986 * we also handle here by calculating how long that time
2987 * would take at the current BW and then return the
2988 * max of our first calculation and that length. Note
2989 * that if rack_min_measure_usec is 0, we don't deal
2990 * with concern 3. Also for both Concern 1 and 3 an
2991 * application limited period could end the measurement
2994 * So lets calculate the BDP with the "known" b/w using
2995 * the SRTT has our rtt and then multiply it by the
2998 bw = rack_get_bw(rack);
2999 srtt = (uint64_t)tp->t_srtt;
3001 len /= (uint64_t)HPTS_USEC_IN_SEC;
3002 len *= max(1, rack_goal_bdp);
3003 /* Now we need to round up to the nearest MSS */
3004 len = roundup(len, segsiz);
3005 if (rack_min_measure_usec) {
3006 /* Now calculate our min length for this b/w */
3007 tim = rack_min_measure_usec;
3008 minl = (tim * bw) / (uint64_t)HPTS_USEC_IN_SEC;
3011 minl = roundup(minl, segsiz);
3016 * Now if we have a very small window we want
3017 * to attempt to get the window that is
3018 * as small as possible. This happens on
3019 * low b/w connections and we don't want to
3020 * span huge numbers of rtt's between measurements.
3022 * We basically include 2 over our "MIN window" so
3023 * that the measurement can be shortened (possibly) by
3027 return (max((uint32_t)len, ((MIN_GP_WIN+2) * segsiz)));
3029 return (max((uint32_t)len, def_len));
3034 rack_enough_for_measurement(struct tcpcb *tp, struct tcp_rack *rack, tcp_seq th_ack, uint8_t *quality)
3036 uint32_t tim, srtts, segsiz;
3039 * Has enough time passed for the GP measurement to be valid?
3041 if ((tp->snd_max == tp->snd_una) ||
3042 (th_ack == tp->snd_max)){
3044 *quality = RACK_QUALITY_ALLACKED;
3047 if (SEQ_LT(th_ack, tp->gput_seq)) {
3048 /* Not enough bytes yet */
3051 segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
3052 if (SEQ_LT(th_ack, tp->gput_ack) &&
3053 ((th_ack - tp->gput_seq) < max(rc_init_window(rack), (MIN_GP_WIN * segsiz)))) {
3054 /* Not enough bytes yet */
3057 if (rack->r_ctl.rc_first_appl &&
3058 (SEQ_GEQ(th_ack, rack->r_ctl.rc_first_appl->r_end))) {
3060 * We are up to the app limited send point
3061 * we have to measure irrespective of the time..
3063 *quality = RACK_QUALITY_APPLIMITED;
3066 /* Now what about time? */
3067 srtts = (rack->r_ctl.rc_gp_srtt * rack_min_srtts);
3068 tim = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time) - tp->gput_ts;
3070 *quality = RACK_QUALITY_HIGH;
3073 /* Nope not even a full SRTT has passed */
3078 rack_log_timely(struct tcp_rack *rack,
3079 uint32_t logged, uint64_t cur_bw, uint64_t low_bnd,
3080 uint64_t up_bnd, int line, uint8_t method)
3082 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
3083 union tcp_log_stackspecific log;
3086 memset(&log, 0, sizeof(log));
3087 log.u_bbr.flex1 = logged;
3088 log.u_bbr.flex2 = rack->rc_gp_timely_inc_cnt;
3089 log.u_bbr.flex2 <<= 4;
3090 log.u_bbr.flex2 |= rack->rc_gp_timely_dec_cnt;
3091 log.u_bbr.flex2 <<= 4;
3092 log.u_bbr.flex2 |= rack->rc_gp_incr;
3093 log.u_bbr.flex2 <<= 4;
3094 log.u_bbr.flex2 |= rack->rc_gp_bwred;
3095 log.u_bbr.flex3 = rack->rc_gp_incr;
3096 log.u_bbr.flex4 = rack->r_ctl.rack_per_of_gp_ss;
3097 log.u_bbr.flex5 = rack->r_ctl.rack_per_of_gp_ca;
3098 log.u_bbr.flex6 = rack->r_ctl.rack_per_of_gp_rec;
3099 log.u_bbr.flex7 = rack->rc_gp_bwred;
3100 log.u_bbr.flex8 = method;
3101 log.u_bbr.cur_del_rate = cur_bw;
3102 log.u_bbr.delRate = low_bnd;
3103 log.u_bbr.bw_inuse = up_bnd;
3104 log.u_bbr.rttProp = rack_get_bw(rack);
3105 log.u_bbr.pkt_epoch = line;
3106 log.u_bbr.pkts_out = rack->r_ctl.rc_rtt_diff;
3107 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
3108 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
3109 log.u_bbr.epoch = rack->r_ctl.rc_gp_srtt;
3110 log.u_bbr.lt_epoch = rack->r_ctl.rc_prev_gp_srtt;
3111 log.u_bbr.cwnd_gain = rack->rc_dragged_bottom;
3112 log.u_bbr.cwnd_gain <<= 1;
3113 log.u_bbr.cwnd_gain |= rack->rc_gp_saw_rec;
3114 log.u_bbr.cwnd_gain <<= 1;
3115 log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ss;
3116 log.u_bbr.cwnd_gain <<= 1;
3117 log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ca;
3118 log.u_bbr.lost = rack->r_ctl.rc_loss_count;
3119 TCP_LOG_EVENTP(rack->rc_tp, NULL,
3120 &rack->rc_inp->inp_socket->so_rcv,
3121 &rack->rc_inp->inp_socket->so_snd,
3123 0, &log, false, &tv);
3128 rack_bw_can_be_raised(struct tcp_rack *rack, uint64_t cur_bw, uint64_t last_bw_est, uint16_t mult)
3131 * Before we increase we need to know if
3132 * the estimate just made was less than
3133 * our pacing goal (i.e. (cur_bw * mult) > last_bw_est)
3135 * If we already are pacing at a fast enough
3136 * rate to push us faster there is no sense of
3139 * We first caculate our actual pacing rate (ss or ca multiplier
3140 * times our cur_bw).
3142 * Then we take the last measured rate and multipy by our
3143 * maximum pacing overage to give us a max allowable rate.
3145 * If our act_rate is smaller than our max_allowable rate
3146 * then we should increase. Else we should hold steady.
3149 uint64_t act_rate, max_allow_rate;
3151 if (rack_timely_no_stopping)
3154 if ((cur_bw == 0) || (last_bw_est == 0)) {
3156 * Initial startup case or
3157 * everything is acked case.
3159 rack_log_timely(rack, mult, cur_bw, 0, 0,
3165 * We can always pace at or slightly above our rate.
3167 rack_log_timely(rack, mult, cur_bw, 0, 0,
3171 act_rate = cur_bw * (uint64_t)mult;
3173 max_allow_rate = last_bw_est * ((uint64_t)rack_max_per_above + (uint64_t)100);
3174 max_allow_rate /= 100;
3175 if (act_rate < max_allow_rate) {
3177 * Here the rate we are actually pacing at
3178 * is smaller than 10% above our last measurement.
3179 * This means we are pacing below what we would
3180 * like to try to achieve (plus some wiggle room).
3182 rack_log_timely(rack, mult, cur_bw, act_rate, max_allow_rate,
3187 * Here we are already pacing at least rack_max_per_above(10%)
3188 * what we are getting back. This indicates most likely
3189 * that we are being limited (cwnd/rwnd/app) and can't
3190 * get any more b/w. There is no sense of trying to
3191 * raise up the pacing rate its not speeding us up
3192 * and we already are pacing faster than we are getting.
3194 rack_log_timely(rack, mult, cur_bw, act_rate, max_allow_rate,
3201 rack_validate_multipliers_at_or_above100(struct tcp_rack *rack)
3204 * When we drag bottom, we want to assure
3205 * that no multiplier is below 1.0, if so
3206 * we want to restore it to at least that.
3208 if (rack->r_ctl.rack_per_of_gp_rec < 100) {
3209 /* This is unlikely we usually do not touch recovery */
3210 rack->r_ctl.rack_per_of_gp_rec = 100;
3212 if (rack->r_ctl.rack_per_of_gp_ca < 100) {
3213 rack->r_ctl.rack_per_of_gp_ca = 100;
3215 if (rack->r_ctl.rack_per_of_gp_ss < 100) {
3216 rack->r_ctl.rack_per_of_gp_ss = 100;
3221 rack_validate_multipliers_at_or_below_100(struct tcp_rack *rack)
3223 if (rack->r_ctl.rack_per_of_gp_ca > 100) {
3224 rack->r_ctl.rack_per_of_gp_ca = 100;
3226 if (rack->r_ctl.rack_per_of_gp_ss > 100) {
3227 rack->r_ctl.rack_per_of_gp_ss = 100;
3232 rack_increase_bw_mul(struct tcp_rack *rack, int timely_says, uint64_t cur_bw, uint64_t last_bw_est, int override)
3234 int32_t calc, logged, plus;
3240 * override is passed when we are
3241 * loosing b/w and making one last
3242 * gasp at trying to not loose out
3243 * to a new-reno flow.
3247 /* In classic timely we boost by 5x if we have 5 increases in a row, lets not */
3248 if (rack->rc_gp_incr &&
3249 ((rack->rc_gp_timely_inc_cnt + 1) >= RACK_TIMELY_CNT_BOOST)) {
3251 * Reset and get 5 strokes more before the boost. Note
3252 * that the count is 0 based so we have to add one.
3255 plus = (uint32_t)rack_gp_increase_per * RACK_TIMELY_CNT_BOOST;
3256 rack->rc_gp_timely_inc_cnt = 0;
3258 plus = (uint32_t)rack_gp_increase_per;
3259 /* Must be at least 1% increase for true timely increases */
3261 ((rack->r_ctl.rc_rtt_diff <= 0) || (timely_says <= 0)))
3263 if (rack->rc_gp_saw_rec &&
3264 (rack->rc_gp_no_rec_chg == 0) &&
3265 rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
3266 rack->r_ctl.rack_per_of_gp_rec)) {
3267 /* We have been in recovery ding it too */
3268 calc = rack->r_ctl.rack_per_of_gp_rec + plus;
3272 rack->r_ctl.rack_per_of_gp_rec = (uint16_t)calc;
3273 if (rack_per_upper_bound_ss &&
3274 (rack->rc_dragged_bottom == 0) &&
3275 (rack->r_ctl.rack_per_of_gp_rec > rack_per_upper_bound_ss))
3276 rack->r_ctl.rack_per_of_gp_rec = rack_per_upper_bound_ss;
3278 if (rack->rc_gp_saw_ca &&
3279 (rack->rc_gp_saw_ss == 0) &&
3280 rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
3281 rack->r_ctl.rack_per_of_gp_ca)) {
3283 calc = rack->r_ctl.rack_per_of_gp_ca + plus;
3287 rack->r_ctl.rack_per_of_gp_ca = (uint16_t)calc;
3288 if (rack_per_upper_bound_ca &&
3289 (rack->rc_dragged_bottom == 0) &&
3290 (rack->r_ctl.rack_per_of_gp_ca > rack_per_upper_bound_ca))
3291 rack->r_ctl.rack_per_of_gp_ca = rack_per_upper_bound_ca;
3293 if (rack->rc_gp_saw_ss &&
3294 rack_bw_can_be_raised(rack, cur_bw, last_bw_est,
3295 rack->r_ctl.rack_per_of_gp_ss)) {
3297 calc = rack->r_ctl.rack_per_of_gp_ss + plus;
3300 rack->r_ctl.rack_per_of_gp_ss = (uint16_t)calc;
3301 if (rack_per_upper_bound_ss &&
3302 (rack->rc_dragged_bottom == 0) &&
3303 (rack->r_ctl.rack_per_of_gp_ss > rack_per_upper_bound_ss))
3304 rack->r_ctl.rack_per_of_gp_ss = rack_per_upper_bound_ss;
3308 (rack->rc_gp_incr == 0)){
3309 /* Go into increment mode */
3310 rack->rc_gp_incr = 1;
3311 rack->rc_gp_timely_inc_cnt = 0;
3313 if (rack->rc_gp_incr &&
3315 (rack->rc_gp_timely_inc_cnt < RACK_TIMELY_CNT_BOOST)) {
3316 rack->rc_gp_timely_inc_cnt++;
3318 rack_log_timely(rack, logged, plus, 0, 0,
3323 rack_get_decrease(struct tcp_rack *rack, uint32_t curper, int32_t rtt_diff)
3326 * norm_grad = rtt_diff / minrtt;
3327 * new_per = curper * (1 - B * norm_grad)
3329 * B = rack_gp_decrease_per (default 10%)
3330 * rtt_dif = input var current rtt-diff
3331 * curper = input var current percentage
3332 * minrtt = from rack filter
3337 perf = (((uint64_t)curper * ((uint64_t)1000000 -
3338 ((uint64_t)rack_gp_decrease_per * (uint64_t)10000 *
3339 (((uint64_t)rtt_diff * (uint64_t)1000000)/
3340 (uint64_t)get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt)))/
3341 (uint64_t)1000000)) /
3343 if (perf > curper) {
3347 return ((uint32_t)perf);
3351 rack_decrease_highrtt(struct tcp_rack *rack, uint32_t curper, uint32_t rtt)
3355 * result = curper * (1 - (B * ( 1 - ------ ))
3358 * B = rack_gp_decrease_per (default 10%)
3359 * highrttthresh = filter_min * rack_gp_rtt_maxmul
3362 uint32_t highrttthresh;
3364 highrttthresh = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_maxmul;
3366 perf = (((uint64_t)curper * ((uint64_t)1000000 -
3367 ((uint64_t)rack_gp_decrease_per * ((uint64_t)1000000 -
3368 ((uint64_t)highrttthresh * (uint64_t)1000000) /
3369 (uint64_t)rtt)) / 100)) /(uint64_t)1000000);
3374 rack_decrease_bw_mul(struct tcp_rack *rack, int timely_says, uint32_t rtt, int32_t rtt_diff)
3376 uint64_t logvar, logvar2, logvar3;
3377 uint32_t logged, new_per, ss_red, ca_red, rec_red, alt, val;
3379 if (rack->rc_gp_incr) {
3380 /* Turn off increment counting */
3381 rack->rc_gp_incr = 0;
3382 rack->rc_gp_timely_inc_cnt = 0;
3384 ss_red = ca_red = rec_red = 0;
3386 /* Calculate the reduction value */
3390 /* Must be at least 1% reduction */
3391 if (rack->rc_gp_saw_rec && (rack->rc_gp_no_rec_chg == 0)) {
3392 /* We have been in recovery ding it too */
3393 if (timely_says == 2) {
3394 new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_rec, rtt);
3395 alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
3401 val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
3402 if (rack->r_ctl.rack_per_of_gp_rec > val) {
3403 rec_red = (rack->r_ctl.rack_per_of_gp_rec - val);
3404 rack->r_ctl.rack_per_of_gp_rec = (uint16_t)val;
3406 rack->r_ctl.rack_per_of_gp_rec = rack_per_lower_bound;
3409 if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_rec)
3410 rack->r_ctl.rack_per_of_gp_rec = rack_per_lower_bound;
3413 if (rack->rc_gp_saw_ss) {
3415 if (timely_says == 2) {
3416 new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_ss, rtt);
3417 alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
3423 val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ss, rtt_diff);
3424 if (rack->r_ctl.rack_per_of_gp_ss > new_per) {
3425 ss_red = rack->r_ctl.rack_per_of_gp_ss - val;
3426 rack->r_ctl.rack_per_of_gp_ss = (uint16_t)val;
3429 rack->r_ctl.rack_per_of_gp_ss = rack_per_lower_bound;
3433 logvar2 = (uint32_t)rtt;
3435 logvar2 |= (uint32_t)rtt_diff;
3436 logvar3 = rack_gp_rtt_maxmul;
3438 logvar3 |= get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
3439 rack_log_timely(rack, timely_says,
3441 logvar, __LINE__, 10);
3443 if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_ss)
3444 rack->r_ctl.rack_per_of_gp_ss = rack_per_lower_bound;
3446 } else if (rack->rc_gp_saw_ca) {
3448 if (timely_says == 2) {
3449 new_per = rack_decrease_highrtt(rack, rack->r_ctl.rack_per_of_gp_ca, rtt);
3450 alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_rec, rtt_diff);
3456 val = new_per = alt = rack_get_decrease(rack, rack->r_ctl.rack_per_of_gp_ca, rtt_diff);
3457 if (rack->r_ctl.rack_per_of_gp_ca > val) {
3458 ca_red = rack->r_ctl.rack_per_of_gp_ca - val;
3459 rack->r_ctl.rack_per_of_gp_ca = (uint16_t)val;
3461 rack->r_ctl.rack_per_of_gp_ca = rack_per_lower_bound;
3466 logvar2 = (uint32_t)rtt;
3468 logvar2 |= (uint32_t)rtt_diff;
3469 logvar3 = rack_gp_rtt_maxmul;
3471 logvar3 |= get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
3472 rack_log_timely(rack, timely_says,
3474 logvar, __LINE__, 10);
3476 if (rack_per_lower_bound > rack->r_ctl.rack_per_of_gp_ca)
3477 rack->r_ctl.rack_per_of_gp_ca = rack_per_lower_bound;
3480 if (rack->rc_gp_timely_dec_cnt < 0x7) {
3481 rack->rc_gp_timely_dec_cnt++;
3482 if (rack_timely_dec_clear &&
3483 (rack->rc_gp_timely_dec_cnt == rack_timely_dec_clear))
3484 rack->rc_gp_timely_dec_cnt = 0;
3489 rack_log_timely(rack, logged, rec_red, rack_per_lower_bound, logvar,
3494 rack_log_rtt_shrinks(struct tcp_rack *rack, uint32_t us_cts,
3495 uint32_t rtt, uint32_t line, uint8_t reas)
3497 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
3498 union tcp_log_stackspecific log;
3501 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
3502 log.u_bbr.flex1 = line;
3503 log.u_bbr.flex2 = rack->r_ctl.rc_time_probertt_starts;
3504 log.u_bbr.flex3 = rack->r_ctl.rc_lower_rtt_us_cts;
3505 log.u_bbr.flex4 = rack->r_ctl.rack_per_of_gp_ss;
3506 log.u_bbr.flex5 = rtt;
3507 log.u_bbr.flex6 = rack->rc_highly_buffered;
3508 log.u_bbr.flex6 <<= 1;
3509 log.u_bbr.flex6 |= rack->forced_ack;
3510 log.u_bbr.flex6 <<= 1;
3511 log.u_bbr.flex6 |= rack->rc_gp_dyn_mul;
3512 log.u_bbr.flex6 <<= 1;
3513 log.u_bbr.flex6 |= rack->in_probe_rtt;
3514 log.u_bbr.flex6 <<= 1;
3515 log.u_bbr.flex6 |= rack->measure_saw_probe_rtt;
3516 log.u_bbr.flex7 = rack->r_ctl.rack_per_of_gp_probertt;
3517 log.u_bbr.pacing_gain = rack->r_ctl.rack_per_of_gp_ca;
3518 log.u_bbr.cwnd_gain = rack->r_ctl.rack_per_of_gp_rec;
3519 log.u_bbr.flex8 = reas;
3520 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
3521 log.u_bbr.delRate = rack_get_bw(rack);
3522 log.u_bbr.cur_del_rate = rack->r_ctl.rc_highest_us_rtt;
3523 log.u_bbr.cur_del_rate <<= 32;
3524 log.u_bbr.cur_del_rate |= rack->r_ctl.rc_lowest_us_rtt;
3525 log.u_bbr.applimited = rack->r_ctl.rc_time_probertt_entered;
3526 log.u_bbr.pkts_out = rack->r_ctl.rc_rtt_diff;
3527 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
3528 log.u_bbr.epoch = rack->r_ctl.rc_gp_srtt;
3529 log.u_bbr.lt_epoch = rack->r_ctl.rc_prev_gp_srtt;
3530 log.u_bbr.pkt_epoch = rack->r_ctl.rc_lower_rtt_us_cts;
3531 log.u_bbr.delivered = rack->r_ctl.rc_target_probertt_flight;
3532 log.u_bbr.lost = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
3533 log.u_bbr.rttProp = us_cts;
3534 log.u_bbr.rttProp <<= 32;
3535 log.u_bbr.rttProp |= rack->r_ctl.rc_entry_gp_rtt;
3536 TCP_LOG_EVENTP(rack->rc_tp, NULL,
3537 &rack->rc_inp->inp_socket->so_rcv,
3538 &rack->rc_inp->inp_socket->so_snd,
3539 BBR_LOG_RTT_SHRINKS, 0,
3540 0, &log, false, &rack->r_ctl.act_rcv_time);
3545 rack_set_prtt_target(struct tcp_rack *rack, uint32_t segsiz, uint32_t rtt)
3549 bwdp = rack_get_bw(rack);
3550 bwdp *= (uint64_t)rtt;
3551 bwdp /= (uint64_t)HPTS_USEC_IN_SEC;
3552 rack->r_ctl.rc_target_probertt_flight = roundup((uint32_t)bwdp, segsiz);
3553 if (rack->r_ctl.rc_target_probertt_flight < (segsiz * rack_timely_min_segs)) {
3555 * A window protocol must be able to have 4 packets
3556 * outstanding as the floor in order to function
3557 * (especially considering delayed ack :D).
3559 rack->r_ctl.rc_target_probertt_flight = (segsiz * rack_timely_min_segs);
3564 rack_enter_probertt(struct tcp_rack *rack, uint32_t us_cts)
3567 * ProbeRTT is a bit different in rack_pacing than in
3568 * BBR. It is like BBR in that it uses the lowering of
3569 * the RTT as a signal that we saw something new and
3570 * counts from there for how long between. But it is
3571 * different in that its quite simple. It does not
3572 * play with the cwnd and wait until we get down
3573 * to N segments outstanding and hold that for
3574 * 200ms. Instead it just sets the pacing reduction
3575 * rate to a set percentage (70 by default) and hold
3576 * that for a number of recent GP Srtt's.
3580 if (rack->rc_gp_dyn_mul == 0)
3583 if (rack->rc_tp->snd_max == rack->rc_tp->snd_una) {
3587 if ((rack->rc_tp->t_flags & TF_GPUTINPROG) &&
3588 SEQ_GT(rack->rc_tp->snd_una, rack->rc_tp->gput_seq)) {
3590 * Stop the goodput now, the idea here is
3591 * that future measurements with in_probe_rtt
3592 * won't register if they are not greater so
3593 * we want to get what info (if any) is available
3596 rack_do_goodput_measurement(rack->rc_tp, rack,
3597 rack->rc_tp->snd_una, __LINE__,
3598 RACK_QUALITY_PROBERTT);
3600 rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
3601 rack->r_ctl.rc_time_probertt_entered = us_cts;
3602 segsiz = min(ctf_fixed_maxseg(rack->rc_tp),
3603 rack->r_ctl.rc_pace_min_segs);
3604 rack->in_probe_rtt = 1;
3605 rack->measure_saw_probe_rtt = 1;
3606 rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
3607 rack->r_ctl.rc_time_probertt_starts = 0;
3608 rack->r_ctl.rc_entry_gp_rtt = rack->r_ctl.rc_gp_srtt;
3609 if (rack_probertt_use_min_rtt_entry)
3610 rack_set_prtt_target(rack, segsiz, get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt));
3612 rack_set_prtt_target(rack, segsiz, rack->r_ctl.rc_gp_srtt);
3613 rack_log_rtt_shrinks(rack, us_cts, get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
3614 __LINE__, RACK_RTTS_ENTERPROBE);
3618 rack_exit_probertt(struct tcp_rack *rack, uint32_t us_cts)
3620 struct rack_sendmap *rsm;
3623 segsiz = min(ctf_fixed_maxseg(rack->rc_tp),
3624 rack->r_ctl.rc_pace_min_segs);
3625 rack->in_probe_rtt = 0;
3626 if ((rack->rc_tp->t_flags & TF_GPUTINPROG) &&
3627 SEQ_GT(rack->rc_tp->snd_una, rack->rc_tp->gput_seq)) {
3629 * Stop the goodput now, the idea here is
3630 * that future measurements with in_probe_rtt
3631 * won't register if they are not greater so
3632 * we want to get what info (if any) is available
3635 rack_do_goodput_measurement(rack->rc_tp, rack,
3636 rack->rc_tp->snd_una, __LINE__,
3637 RACK_QUALITY_PROBERTT);
3638 } else if (rack->rc_tp->t_flags & TF_GPUTINPROG) {
3640 * We don't have enough data to make a measurement.
3641 * So lets just stop and start here after exiting
3642 * probe-rtt. We probably are not interested in
3643 * the results anyway.
3645 rack->rc_tp->t_flags &= ~TF_GPUTINPROG;
3648 * Measurements through the current snd_max are going
3649 * to be limited by the slower pacing rate.
3651 * We need to mark these as app-limited so we
3652 * don't collapse the b/w.
3654 rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
3655 if (rsm && ((rsm->r_flags & RACK_APP_LIMITED) == 0)) {
3656 if (rack->r_ctl.rc_app_limited_cnt == 0)
3657 rack->r_ctl.rc_end_appl = rack->r_ctl.rc_first_appl = rsm;
3660 * Go out to the end app limited and mark
3661 * this new one as next and move the end_appl up
3664 if (rack->r_ctl.rc_end_appl)
3665 rack->r_ctl.rc_end_appl->r_nseq_appl = rsm->r_start;
3666 rack->r_ctl.rc_end_appl = rsm;
3668 rsm->r_flags |= RACK_APP_LIMITED;
3669 rack->r_ctl.rc_app_limited_cnt++;
3672 * Now, we need to examine our pacing rate multipliers.
3673 * If its under 100%, we need to kick it back up to
3674 * 100%. We also don't let it be over our "max" above
3675 * the actual rate i.e. 100% + rack_clamp_atexit_prtt.
3676 * Note setting clamp_atexit_prtt to 0 has the effect
3677 * of setting CA/SS to 100% always at exit (which is
3678 * the default behavior).
3680 if (rack_probertt_clear_is) {
3681 rack->rc_gp_incr = 0;
3682 rack->rc_gp_bwred = 0;
3683 rack->rc_gp_timely_inc_cnt = 0;
3684 rack->rc_gp_timely_dec_cnt = 0;
3686 /* Do we do any clamping at exit? */
3687 if (rack->rc_highly_buffered && rack_atexit_prtt_hbp) {
3688 rack->r_ctl.rack_per_of_gp_ca = rack_atexit_prtt_hbp;
3689 rack->r_ctl.rack_per_of_gp_ss = rack_atexit_prtt_hbp;
3691 if ((rack->rc_highly_buffered == 0) && rack_atexit_prtt) {
3692 rack->r_ctl.rack_per_of_gp_ca = rack_atexit_prtt;
3693 rack->r_ctl.rack_per_of_gp_ss = rack_atexit_prtt;
3696 * Lets set rtt_diff to 0, so that we will get a "boost"
3699 rack->r_ctl.rc_rtt_diff = 0;
3701 /* Clear all flags so we start fresh */
3702 rack->rc_tp->t_bytes_acked = 0;
3703 rack->rc_tp->t_ccv.flags &= ~CCF_ABC_SENTAWND;
3705 * If configured to, set the cwnd and ssthresh to
3708 if (rack_probe_rtt_sets_cwnd) {
3712 /* Set ssthresh so we get into CA once we hit our target */
3713 if (rack_probertt_use_min_rtt_exit == 1) {
3714 /* Set to min rtt */
3715 rack_set_prtt_target(rack, segsiz,
3716 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt));
3717 } else if (rack_probertt_use_min_rtt_exit == 2) {
3718 /* Set to current gp rtt */
3719 rack_set_prtt_target(rack, segsiz,
3720 rack->r_ctl.rc_gp_srtt);
3721 } else if (rack_probertt_use_min_rtt_exit == 3) {
3722 /* Set to entry gp rtt */
3723 rack_set_prtt_target(rack, segsiz,
3724 rack->r_ctl.rc_entry_gp_rtt);
3729 sum = rack->r_ctl.rc_entry_gp_rtt;
3731 sum /= (uint64_t)(max(1, rack->r_ctl.rc_gp_srtt));
3734 * A highly buffered path needs
3735 * cwnd space for timely to work.
3736 * Lets set things up as if
3737 * we are heading back here again.
3739 setval = rack->r_ctl.rc_entry_gp_rtt;
3740 } else if (sum >= 15) {
3742 * Lets take the smaller of the
3743 * two since we are just somewhat
3746 setval = rack->r_ctl.rc_gp_srtt;
3747 if (setval > rack->r_ctl.rc_entry_gp_rtt)
3748 setval = rack->r_ctl.rc_entry_gp_rtt;
3751 * Here we are not highly buffered
3752 * and should pick the min we can to
3753 * keep from causing loss.
3755 setval = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
3757 rack_set_prtt_target(rack, segsiz,
3760 if (rack_probe_rtt_sets_cwnd > 1) {
3761 /* There is a percentage here to boost */
3762 ebdp = rack->r_ctl.rc_target_probertt_flight;
3763 ebdp *= rack_probe_rtt_sets_cwnd;
3765 setto = rack->r_ctl.rc_target_probertt_flight + ebdp;
3767 setto = rack->r_ctl.rc_target_probertt_flight;
3768 rack->rc_tp->snd_cwnd = roundup(setto, segsiz);
3769 if (rack->rc_tp->snd_cwnd < (segsiz * rack_timely_min_segs)) {
3771 rack->rc_tp->snd_cwnd = segsiz * rack_timely_min_segs;
3773 /* If we set in the cwnd also set the ssthresh point so we are in CA */
3774 rack->rc_tp->snd_ssthresh = (rack->rc_tp->snd_cwnd - 1);
3776 rack_log_rtt_shrinks(rack, us_cts,
3777 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
3778 __LINE__, RACK_RTTS_EXITPROBE);
3779 /* Clear times last so log has all the info */
3780 rack->r_ctl.rc_probertt_sndmax_atexit = rack->rc_tp->snd_max;
3781 rack->r_ctl.rc_time_probertt_entered = us_cts;
3782 rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
3783 rack->r_ctl.rc_time_of_last_probertt = us_cts;
3787 rack_check_probe_rtt(struct tcp_rack *rack, uint32_t us_cts)
3789 /* Check in on probe-rtt */
3790 if (rack->rc_gp_filled == 0) {
3791 /* We do not do p-rtt unless we have gp measurements */
3794 if (rack->in_probe_rtt) {
3795 uint64_t no_overflow;
3796 uint32_t endtime, must_stay;
3798 if (rack->r_ctl.rc_went_idle_time &&
3799 ((us_cts - rack->r_ctl.rc_went_idle_time) > rack_min_probertt_hold)) {
3801 * We went idle during prtt, just exit now.
3803 rack_exit_probertt(rack, us_cts);
3804 } else if (rack_probe_rtt_safety_val &&
3805 TSTMP_GT(us_cts, rack->r_ctl.rc_time_probertt_entered) &&
3806 ((us_cts - rack->r_ctl.rc_time_probertt_entered) > rack_probe_rtt_safety_val)) {
3808 * Probe RTT safety value triggered!
3810 rack_log_rtt_shrinks(rack, us_cts,
3811 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
3812 __LINE__, RACK_RTTS_SAFETY);
3813 rack_exit_probertt(rack, us_cts);
3815 /* Calculate the max we will wait */
3816 endtime = rack->r_ctl.rc_time_probertt_entered + (rack->r_ctl.rc_gp_srtt * rack_max_drain_wait);
3817 if (rack->rc_highly_buffered)
3818 endtime += (rack->r_ctl.rc_gp_srtt * rack_max_drain_hbp);
3819 /* Calculate the min we must wait */
3820 must_stay = rack->r_ctl.rc_time_probertt_entered + (rack->r_ctl.rc_gp_srtt * rack_must_drain);
3821 if ((ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) > rack->r_ctl.rc_target_probertt_flight) &&
3822 TSTMP_LT(us_cts, endtime)) {
3824 /* Do we lower more? */
3826 if (TSTMP_GT(us_cts, rack->r_ctl.rc_time_probertt_entered))
3827 calc = us_cts - rack->r_ctl.rc_time_probertt_entered;
3830 calc /= max(rack->r_ctl.rc_gp_srtt, 1);
3833 calc *= rack_per_of_gp_probertt_reduce;
3834 rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt - calc;
3836 if (rack->r_ctl.rack_per_of_gp_probertt < rack_per_of_gp_lowthresh)
3837 rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_lowthresh;
3839 /* We must reach target or the time set */
3842 if (rack->r_ctl.rc_time_probertt_starts == 0) {
3843 if ((TSTMP_LT(us_cts, must_stay) &&
3844 rack->rc_highly_buffered) ||
3845 (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) >
3846 rack->r_ctl.rc_target_probertt_flight)) {
3847 /* We are not past the must_stay time */
3850 rack_log_rtt_shrinks(rack, us_cts,
3851 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
3852 __LINE__, RACK_RTTS_REACHTARGET);
3853 rack->r_ctl.rc_time_probertt_starts = us_cts;
3854 if (rack->r_ctl.rc_time_probertt_starts == 0)
3855 rack->r_ctl.rc_time_probertt_starts = 1;
3856 /* Restore back to our rate we want to pace at in prtt */
3857 rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
3860 * Setup our end time, some number of gp_srtts plus 200ms.
3862 no_overflow = ((uint64_t)rack->r_ctl.rc_gp_srtt *
3863 (uint64_t)rack_probertt_gpsrtt_cnt_mul);
3864 if (rack_probertt_gpsrtt_cnt_div)
3865 endtime = (uint32_t)(no_overflow / (uint64_t)rack_probertt_gpsrtt_cnt_div);
3868 endtime += rack_min_probertt_hold;
3869 endtime += rack->r_ctl.rc_time_probertt_starts;
3870 if (TSTMP_GEQ(us_cts, endtime)) {
3871 /* yes, exit probertt */
3872 rack_exit_probertt(rack, us_cts);
3875 } else if ((us_cts - rack->r_ctl.rc_lower_rtt_us_cts) >= rack_time_between_probertt) {
3876 /* Go into probertt, its been too long since we went lower */
3877 rack_enter_probertt(rack, us_cts);
3882 rack_update_multiplier(struct tcp_rack *rack, int32_t timely_says, uint64_t last_bw_est,
3883 uint32_t rtt, int32_t rtt_diff)
3885 uint64_t cur_bw, up_bnd, low_bnd, subfr;
3888 if ((rack->rc_gp_dyn_mul == 0) ||
3889 (rack->use_fixed_rate) ||
3890 (rack->in_probe_rtt) ||
3891 (rack->rc_always_pace == 0)) {
3892 /* No dynamic GP multiplier in play */
3895 losses = rack->r_ctl.rc_loss_count - rack->r_ctl.rc_loss_at_start;
3896 cur_bw = rack_get_bw(rack);
3897 /* Calculate our up and down range */
3898 up_bnd = rack->r_ctl.last_gp_comp_bw * (uint64_t)rack_gp_per_bw_mul_up;
3900 up_bnd += rack->r_ctl.last_gp_comp_bw;
3902 subfr = (uint64_t)rack->r_ctl.last_gp_comp_bw * (uint64_t)rack_gp_per_bw_mul_down;
3904 low_bnd = rack->r_ctl.last_gp_comp_bw - subfr;
3905 if ((timely_says == 2) && (rack->r_ctl.rc_no_push_at_mrtt)) {
3907 * This is the case where our RTT is above
3908 * the max target and we have been configured
3909 * to just do timely no bonus up stuff in that case.
3911 * There are two configurations, set to 1, and we
3912 * just do timely if we are over our max. If its
3913 * set above 1 then we slam the multipliers down
3914 * to 100 and then decrement per timely.
3916 rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
3918 if (rack->r_ctl.rc_no_push_at_mrtt > 1)
3919 rack_validate_multipliers_at_or_below_100(rack);
3920 rack_decrease_bw_mul(rack, timely_says, rtt, rtt_diff);
3921 } else if ((last_bw_est < low_bnd) && !losses) {
3923 * We are decreasing this is a bit complicated this
3924 * means we are loosing ground. This could be
3925 * because another flow entered and we are competing
3926 * for b/w with it. This will push the RTT up which
3927 * makes timely unusable unless we want to get shoved
3928 * into a corner and just be backed off (the age
3929 * old problem with delay based CC).
3931 * On the other hand if it was a route change we
3932 * would like to stay somewhat contained and not
3933 * blow out the buffers.
3935 rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
3937 rack->r_ctl.last_gp_comp_bw = cur_bw;
3938 if (rack->rc_gp_bwred == 0) {
3939 /* Go into reduction counting */
3940 rack->rc_gp_bwred = 1;
3941 rack->rc_gp_timely_dec_cnt = 0;
3943 if ((rack->rc_gp_timely_dec_cnt < rack_timely_max_push_drop) ||
3944 (timely_says == 0)) {
3946 * Push another time with a faster pacing
3947 * to try to gain back (we include override to
3948 * get a full raise factor).
3950 if ((rack->rc_gp_saw_ca && rack->r_ctl.rack_per_of_gp_ca <= rack_down_raise_thresh) ||
3951 (rack->rc_gp_saw_ss && rack->r_ctl.rack_per_of_gp_ss <= rack_down_raise_thresh) ||
3952 (timely_says == 0) ||
3953 (rack_down_raise_thresh == 0)) {
3955 * Do an override up in b/w if we were
3956 * below the threshold or if the threshold
3957 * is zero we always do the raise.
3959 rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 1);
3961 /* Log it stays the same */
3962 rack_log_timely(rack, 0, last_bw_est, low_bnd, 0,
3965 rack->rc_gp_timely_dec_cnt++;
3966 /* We are not incrementing really no-count */
3967 rack->rc_gp_incr = 0;
3968 rack->rc_gp_timely_inc_cnt = 0;
3971 * Lets just use the RTT
3972 * information and give up
3977 } else if ((timely_says != 2) &&
3979 (last_bw_est > up_bnd)) {
3981 * We are increasing b/w lets keep going, updating
3982 * our b/w and ignoring any timely input, unless
3983 * of course we are at our max raise (if there is one).
3986 rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
3988 rack->r_ctl.last_gp_comp_bw = cur_bw;
3989 if (rack->rc_gp_saw_ss &&
3990 rack_per_upper_bound_ss &&
3991 (rack->r_ctl.rack_per_of_gp_ss == rack_per_upper_bound_ss)) {
3993 * In cases where we can't go higher
3994 * we should just use timely.
3998 if (rack->rc_gp_saw_ca &&
3999 rack_per_upper_bound_ca &&
4000 (rack->r_ctl.rack_per_of_gp_ca == rack_per_upper_bound_ca)) {
4002 * In cases where we can't go higher
4003 * we should just use timely.
4007 rack->rc_gp_bwred = 0;
4008 rack->rc_gp_timely_dec_cnt = 0;
4009 /* You get a set number of pushes if timely is trying to reduce */
4010 if ((rack->rc_gp_incr < rack_timely_max_push_rise) || (timely_says == 0)) {
4011 rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
4013 /* Log it stays the same */
4014 rack_log_timely(rack, 0, last_bw_est, up_bnd, 0,
4020 * We are staying between the lower and upper range bounds
4021 * so use timely to decide.
4023 rack_log_timely(rack, timely_says, cur_bw, low_bnd, up_bnd,
4027 rack->rc_gp_incr = 0;
4028 rack->rc_gp_timely_inc_cnt = 0;
4029 if ((rack->rc_gp_timely_dec_cnt < rack_timely_max_push_drop) &&
4031 (last_bw_est < low_bnd)) {
4032 /* We are loosing ground */
4033 rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
4034 rack->rc_gp_timely_dec_cnt++;
4035 /* We are not incrementing really no-count */
4036 rack->rc_gp_incr = 0;
4037 rack->rc_gp_timely_inc_cnt = 0;
4039 rack_decrease_bw_mul(rack, timely_says, rtt, rtt_diff);
4041 rack->rc_gp_bwred = 0;
4042 rack->rc_gp_timely_dec_cnt = 0;
4043 rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
4049 rack_make_timely_judgement(struct tcp_rack *rack, uint32_t rtt, int32_t rtt_diff, uint32_t prev_rtt)
4051 int32_t timely_says;
4052 uint64_t log_mult, log_rtt_a_diff;
4054 log_rtt_a_diff = rtt;
4055 log_rtt_a_diff <<= 32;
4056 log_rtt_a_diff |= (uint32_t)rtt_diff;
4057 if (rtt >= (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) *
4058 rack_gp_rtt_maxmul)) {
4059 /* Reduce the b/w multiplier */
4061 log_mult = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_maxmul;
4063 log_mult |= prev_rtt;
4064 rack_log_timely(rack, timely_says, log_mult,
4065 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
4066 log_rtt_a_diff, __LINE__, 4);
4067 } else if (rtt <= (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) +
4068 ((get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_minmul) /
4069 max(rack_gp_rtt_mindiv , 1)))) {
4070 /* Increase the b/w multiplier */
4071 log_mult = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) +
4072 ((get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack_gp_rtt_minmul) /
4073 max(rack_gp_rtt_mindiv , 1));
4075 log_mult |= prev_rtt;
4077 rack_log_timely(rack, timely_says, log_mult ,
4078 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt),
4079 log_rtt_a_diff, __LINE__, 5);
4082 * Use a gradient to find it the timely gradient
4084 * grad = rc_rtt_diff / min_rtt;
4086 * anything below or equal to 0 will be
4087 * a increase indication. Anything above
4088 * zero is a decrease. Note we take care
4089 * of the actual gradient calculation
4090 * in the reduction (its not needed for
4093 log_mult = prev_rtt;
4094 if (rtt_diff <= 0) {
4096 * Rttdiff is less than zero, increase the
4097 * b/w multiplier (its 0 or negative)
4100 rack_log_timely(rack, timely_says, log_mult,
4101 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt), log_rtt_a_diff, __LINE__, 6);
4103 /* Reduce the b/w multiplier */
4105 rack_log_timely(rack, timely_says, log_mult,
4106 get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt), log_rtt_a_diff, __LINE__, 7);
4109 return (timely_says);
4113 rack_do_goodput_measurement(struct tcpcb *tp, struct tcp_rack *rack,
4114 tcp_seq th_ack, int line, uint8_t quality)
4116 uint64_t tim, bytes_ps, ltim, stim, utim;
4117 uint32_t segsiz, bytes, reqbytes, us_cts;
4118 int32_t gput, new_rtt_diff, timely_says;
4119 uint64_t resid_bw, subpart = 0, addpart = 0, srtt;
4122 us_cts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
4123 segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
4124 if (TSTMP_GEQ(us_cts, tp->gput_ts))
4125 tim = us_cts - tp->gput_ts;
4128 if (rack->r_ctl.rc_gp_cumack_ts > rack->r_ctl.rc_gp_output_ts)
4129 stim = rack->r_ctl.rc_gp_cumack_ts - rack->r_ctl.rc_gp_output_ts;
4133 * Use the larger of the send time or ack time. This prevents us
4134 * from being influenced by ack artifacts to come up with too
4135 * high of measurement. Note that since we are spanning over many more
4136 * bytes in most of our measurements hopefully that is less likely to
4142 utim = max(stim, 1);
4143 /* Lets get a msec time ltim too for the old stuff */
4144 ltim = max(1, (utim / HPTS_USEC_IN_MSEC));
4145 gput = (((uint64_t) (th_ack - tp->gput_seq)) << 3) / ltim;
4146 reqbytes = min(rc_init_window(rack), (MIN_GP_WIN * segsiz));
4147 if ((tim == 0) && (stim == 0)) {
4149 * Invalid measurement time, maybe
4150 * all on one ack/one send?
4154 rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
4155 0, 0, 0, 10, __LINE__, NULL, quality);
4156 goto skip_measurement;
4158 if (rack->r_ctl.rc_gp_lowrtt == 0xffffffff) {
4159 /* We never made a us_rtt measurement? */
4162 rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
4163 0, 0, 0, 10, __LINE__, NULL, quality);
4164 goto skip_measurement;
4167 * Calculate the maximum possible b/w this connection
4168 * could have. We base our calculation on the lowest
4169 * rtt we have seen during the measurement and the
4170 * largest rwnd the client has given us in that time. This
4171 * forms a BDP that is the maximum that we could ever
4172 * get to the client. Anything larger is not valid.
4174 * I originally had code here that rejected measurements
4175 * where the time was less than 1/2 the latest us_rtt.
4176 * But after thinking on that I realized its wrong since
4177 * say you had a 150Mbps or even 1Gbps link, and you
4178 * were a long way away.. example I am in Europe (100ms rtt)
4179 * talking to my 1Gbps link in S.C. Now measuring say 150,000
4180 * bytes my time would be 1.2ms, and yet my rtt would say
4181 * the measurement was invalid the time was < 50ms. The
4182 * same thing is true for 150Mb (8ms of time).
4184 * A better way I realized is to look at what the maximum
4185 * the connection could possibly do. This is gated on
4186 * the lowest RTT we have seen and the highest rwnd.
4187 * We should in theory never exceed that, if we are
4188 * then something on the path is storing up packets
4189 * and then feeding them all at once to our endpoint
4190 * messing up our measurement.
4192 rack->r_ctl.last_max_bw = rack->r_ctl.rc_gp_high_rwnd;
4193 rack->r_ctl.last_max_bw *= HPTS_USEC_IN_SEC;
4194 rack->r_ctl.last_max_bw /= rack->r_ctl.rc_gp_lowrtt;
4195 if (SEQ_LT(th_ack, tp->gput_seq)) {
4196 /* No measurement can be made */
4199 rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
4200 0, 0, 0, 10, __LINE__, NULL, quality);
4201 goto skip_measurement;
4203 bytes = (th_ack - tp->gput_seq);
4204 bytes_ps = (uint64_t)bytes;
4206 * Don't measure a b/w for pacing unless we have gotten at least
4207 * an initial windows worth of data in this measurement interval.
4209 * Small numbers of bytes get badly influenced by delayed ack and
4210 * other artifacts. Note we take the initial window or our
4211 * defined minimum GP (defaulting to 10 which hopefully is the
4214 if (rack->rc_gp_filled == 0) {
4216 * The initial estimate is special. We
4217 * have blasted out an IW worth of packets
4218 * without a real valid ack ts results. We
4219 * then setup the app_limited_needs_set flag,
4220 * this should get the first ack in (probably 2
4221 * MSS worth) to be recorded as the timestamp.
4222 * We thus allow a smaller number of bytes i.e.
4225 reqbytes -= (2 * segsiz);
4226 /* Also lets fill previous for our first measurement to be neutral */
4227 rack->r_ctl.rc_prev_gp_srtt = rack->r_ctl.rc_gp_srtt;
4229 if ((bytes_ps < reqbytes) || rack->app_limited_needs_set) {
4230 rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
4231 rack->r_ctl.rc_app_limited_cnt,
4232 0, 0, 10, __LINE__, NULL, quality);
4233 goto skip_measurement;
4236 * We now need to calculate the Timely like status so
4237 * we can update (possibly) the b/w multipliers.
4239 new_rtt_diff = (int32_t)rack->r_ctl.rc_gp_srtt - (int32_t)rack->r_ctl.rc_prev_gp_srtt;
4240 if (rack->rc_gp_filled == 0) {
4241 /* No previous reading */
4242 rack->r_ctl.rc_rtt_diff = new_rtt_diff;
4244 if (rack->measure_saw_probe_rtt == 0) {
4246 * We don't want a probertt to be counted
4247 * since it will be negative incorrectly. We
4248 * expect to be reducing the RTT when we
4249 * pace at a slower rate.
4251 rack->r_ctl.rc_rtt_diff -= (rack->r_ctl.rc_rtt_diff / 8);
4252 rack->r_ctl.rc_rtt_diff += (new_rtt_diff / 8);
4255 timely_says = rack_make_timely_judgement(rack,
4256 rack->r_ctl.rc_gp_srtt,
4257 rack->r_ctl.rc_rtt_diff,
4258 rack->r_ctl.rc_prev_gp_srtt
4260 bytes_ps *= HPTS_USEC_IN_SEC;
4262 if (bytes_ps > rack->r_ctl.last_max_bw) {
4264 * Something is on path playing
4265 * since this b/w is not possible based
4266 * on our BDP (highest rwnd and lowest rtt
4267 * we saw in the measurement window).
4269 * Another option here would be to
4270 * instead skip the measurement.
4272 rack_log_pacing_delay_calc(rack, bytes, reqbytes,
4273 bytes_ps, rack->r_ctl.last_max_bw, 0,
4274 11, __LINE__, NULL, quality);
4275 bytes_ps = rack->r_ctl.last_max_bw;
4277 /* We store gp for b/w in bytes per second */
4278 if (rack->rc_gp_filled == 0) {
4279 /* Initial measurement */
4281 rack->r_ctl.gp_bw = bytes_ps;
4282 rack->rc_gp_filled = 1;
4283 rack->r_ctl.num_measurements = 1;
4284 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
4286 rack_log_pacing_delay_calc(rack, bytes_ps, reqbytes,
4287 rack->r_ctl.rc_app_limited_cnt,
4288 0, 0, 10, __LINE__, NULL, quality);
4290 if (tcp_in_hpts(rack->rc_inp) &&
4291 (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
4293 * Ok we can't trust the pacer in this case
4294 * where we transition from un-paced to paced.
4295 * Or for that matter when the burst mitigation
4296 * was making a wild guess and got it wrong.
4297 * Stop the pacer and clear up all the aggregate
4300 tcp_hpts_remove(rack->rc_inp);
4301 rack->r_ctl.rc_hpts_flags = 0;
4302 rack->r_ctl.rc_last_output_to = 0;
4305 } else if (rack->r_ctl.num_measurements < RACK_REQ_AVG) {
4306 /* Still a small number run an average */
4307 rack->r_ctl.gp_bw += bytes_ps;
4308 addpart = rack->r_ctl.num_measurements;
4309 rack->r_ctl.num_measurements++;
4310 if (rack->r_ctl.num_measurements >= RACK_REQ_AVG) {
4311 /* We have collected enough to move forward */
4312 rack->r_ctl.gp_bw /= (uint64_t)rack->r_ctl.num_measurements;
4317 * We want to take 1/wma of the goodput and add in to 7/8th
4318 * of the old value weighted by the srtt. So if your measurement
4319 * period is say 2 SRTT's long you would get 1/4 as the
4320 * value, if it was like 1/2 SRTT then you would get 1/16th.
4322 * But we must be careful not to take too much i.e. if the
4323 * srtt is say 20ms and the measurement is taken over
4324 * 400ms our weight would be 400/20 i.e. 20. On the
4325 * other hand if we get a measurement over 1ms with a
4326 * 10ms rtt we only want to take a much smaller portion.
4328 if (rack->r_ctl.num_measurements < 0xff) {
4329 rack->r_ctl.num_measurements++;
4331 srtt = (uint64_t)tp->t_srtt;
4334 * Strange why did t_srtt go back to zero?
4336 if (rack->r_ctl.rc_rack_min_rtt)
4337 srtt = rack->r_ctl.rc_rack_min_rtt;
4339 srtt = HPTS_USEC_IN_MSEC;
4342 * XXXrrs: Note for reviewers, in playing with
4343 * dynamic pacing I discovered this GP calculation
4344 * as done originally leads to some undesired results.
4345 * Basically you can get longer measurements contributing
4346 * too much to the WMA. Thus I changed it if you are doing
4347 * dynamic adjustments to only do the aportioned adjustment
4348 * if we have a very small (time wise) measurement. Longer
4349 * measurements just get there weight (defaulting to 1/8)
4350 * add to the WMA. We may want to think about changing
4351 * this to always do that for both sides i.e. dynamic
4352 * and non-dynamic... but considering lots of folks
4353 * were playing with this I did not want to change the
4354 * calculation per.se. without your thoughts.. Lawerence?
4357 if (rack->rc_gp_dyn_mul == 0) {
4358 subpart = rack->r_ctl.gp_bw * utim;
4359 subpart /= (srtt * 8);
4360 if (subpart < (rack->r_ctl.gp_bw / 2)) {
4362 * The b/w update takes no more
4363 * away then 1/2 our running total
4366 addpart = bytes_ps * utim;
4367 addpart /= (srtt * 8);
4370 * Don't allow a single measurement
4371 * to account for more than 1/2 of the
4372 * WMA. This could happen on a retransmission
4373 * where utim becomes huge compared to
4374 * srtt (multiple retransmissions when using
4375 * the sending rate which factors in all the
4376 * transmissions from the first one).
4378 subpart = rack->r_ctl.gp_bw / 2;
4379 addpart = bytes_ps / 2;
4381 resid_bw = rack->r_ctl.gp_bw - subpart;
4382 rack->r_ctl.gp_bw = resid_bw + addpart;
4385 if ((utim / srtt) <= 1) {
4387 * The b/w update was over a small period
4388 * of time. The idea here is to prevent a small
4389 * measurement time period from counting
4390 * too much. So we scale it based on the
4391 * time so it attributes less than 1/rack_wma_divisor
4392 * of its measurement.
4394 subpart = rack->r_ctl.gp_bw * utim;
4395 subpart /= (srtt * rack_wma_divisor);
4396 addpart = bytes_ps * utim;
4397 addpart /= (srtt * rack_wma_divisor);
4400 * The scaled measurement was long
4401 * enough so lets just add in the
4402 * portion of the measurement i.e. 1/rack_wma_divisor
4404 subpart = rack->r_ctl.gp_bw / rack_wma_divisor;
4405 addpart = bytes_ps / rack_wma_divisor;
4407 if ((rack->measure_saw_probe_rtt == 0) ||
4408 (bytes_ps > rack->r_ctl.gp_bw)) {
4410 * For probe-rtt we only add it in
4411 * if its larger, all others we just
4415 resid_bw = rack->r_ctl.gp_bw - subpart;
4416 rack->r_ctl.gp_bw = resid_bw + addpart;
4420 if ((rack->gp_ready == 0) &&
4421 (rack->r_ctl.num_measurements >= rack->r_ctl.req_measurements)) {
4422 /* We have enough measurements now */
4424 rack_set_cc_pacing(rack);
4425 if (rack->defer_options)
4426 rack_apply_deferred_options(rack);
4428 rack_log_pacing_delay_calc(rack, subpart, addpart, bytes_ps, stim,
4429 rack_get_bw(rack), 22, did_add, NULL, quality);
4430 /* We do not update any multipliers if we are in or have seen a probe-rtt */
4431 if ((rack->measure_saw_probe_rtt == 0) && rack->rc_gp_rtt_set)
4432 rack_update_multiplier(rack, timely_says, bytes_ps,
4433 rack->r_ctl.rc_gp_srtt,
4434 rack->r_ctl.rc_rtt_diff);
4435 rack_log_pacing_delay_calc(rack, bytes, tim, bytes_ps, stim,
4436 rack_get_bw(rack), 3, line, NULL, quality);
4437 /* reset the gp srtt and setup the new prev */
4438 rack->r_ctl.rc_prev_gp_srtt = rack->r_ctl.rc_gp_srtt;
4439 /* Record the lost count for the next measurement */
4440 rack->r_ctl.rc_loss_at_start = rack->r_ctl.rc_loss_count;
4442 * We restart our diffs based on the gpsrtt in the
4443 * measurement window.
4445 rack->rc_gp_rtt_set = 0;
4446 rack->rc_gp_saw_rec = 0;
4447 rack->rc_gp_saw_ca = 0;
4448 rack->rc_gp_saw_ss = 0;
4449 rack->rc_dragged_bottom = 0;
4453 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT,
4456 * XXXLAS: This is a temporary hack, and should be
4457 * chained off VOI_TCP_GPUT when stats(9) grows an
4458 * API to deal with chained VOIs.
4460 if (tp->t_stats_gput_prev > 0)
4461 stats_voi_update_abs_s32(tp->t_stats,
4463 ((gput - tp->t_stats_gput_prev) * 100) /
4464 tp->t_stats_gput_prev);
4466 tp->t_flags &= ~TF_GPUTINPROG;
4467 tp->t_stats_gput_prev = gput;
4469 * Now are we app limited now and there is space from where we
4470 * were to where we want to go?
4472 * We don't do the other case i.e. non-applimited here since
4473 * the next send will trigger us picking up the missing data.
4475 if (rack->r_ctl.rc_first_appl &&
4476 TCPS_HAVEESTABLISHED(tp->t_state) &&
4477 rack->r_ctl.rc_app_limited_cnt &&
4478 (SEQ_GT(rack->r_ctl.rc_first_appl->r_start, th_ack)) &&
4479 ((rack->r_ctl.rc_first_appl->r_end - th_ack) >
4480 max(rc_init_window(rack), (MIN_GP_WIN * segsiz)))) {
4482 * Yep there is enough outstanding to make a measurement here.
4484 struct rack_sendmap *rsm, fe;
4486 rack->r_ctl.rc_gp_lowrtt = 0xffffffff;
4487 rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
4488 tp->gput_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
4489 rack->app_limited_needs_set = 0;
4490 tp->gput_seq = th_ack;
4491 if (rack->in_probe_rtt)
4492 rack->measure_saw_probe_rtt = 1;
4493 else if ((rack->measure_saw_probe_rtt) &&
4494 (SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
4495 rack->measure_saw_probe_rtt = 0;
4496 if ((rack->r_ctl.rc_first_appl->r_end - th_ack) >= rack_get_measure_window(tp, rack)) {
4497 /* There is a full window to gain info from */
4498 tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
4500 /* We can only measure up to the applimited point */
4501 tp->gput_ack = tp->gput_seq + (rack->r_ctl.rc_first_appl->r_end - th_ack);
4502 if ((tp->gput_ack - tp->gput_seq) < (MIN_GP_WIN * segsiz)) {
4504 * We don't have enough to make a measurement.
4506 tp->t_flags &= ~TF_GPUTINPROG;
4507 rack_log_pacing_delay_calc(rack, tp->gput_ack, tp->gput_seq,
4508 0, 0, 0, 6, __LINE__, NULL, quality);
4512 if (tp->t_state >= TCPS_FIN_WAIT_1) {
4514 * We will get no more data into the SB
4515 * this means we need to have the data available
4516 * before we start a measurement.
4518 if (sbavail(&tptosocket(tp)->so_snd) < (tp->gput_ack - tp->gput_seq)) {
4519 /* Nope not enough data. */
4523 tp->t_flags |= TF_GPUTINPROG;
4525 * Now we need to find the timestamp of the send at tp->gput_seq
4526 * for the send based measurement.
4528 fe.r_start = tp->gput_seq;
4529 rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
4531 /* Ok send-based limit is set */
4532 if (SEQ_LT(rsm->r_start, tp->gput_seq)) {
4534 * Move back to include the earlier part
4535 * so our ack time lines up right (this may
4536 * make an overlapping measurement but thats
4539 tp->gput_seq = rsm->r_start;
4541 if (rsm->r_flags & RACK_ACKED)
4542 tp->gput_ts = (uint32_t)rsm->r_ack_arrival;
4544 rack->app_limited_needs_set = 1;
4545 rack->r_ctl.rc_gp_output_ts = rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
4548 * If we don't find the rsm due to some
4549 * send-limit set the current time, which
4550 * basically disables the send-limit.
4555 rack->r_ctl.rc_gp_output_ts = rack_to_usec_ts(&tv);
4557 rack_log_pacing_delay_calc(rack,
4562 rack->r_ctl.rc_app_limited_cnt,
4564 __LINE__, NULL, quality);
4569 * CC wrapper hook functions
4572 rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack, uint32_t th_ack, uint16_t nsegs,
4573 uint16_t type, int32_t recovery)
4575 uint32_t prior_cwnd, acked;
4576 struct tcp_log_buffer *lgb = NULL;
4577 uint8_t labc_to_use, quality;
4579 INP_WLOCK_ASSERT(tptoinpcb(tp));
4580 tp->t_ccv.nsegs = nsegs;
4581 acked = tp->t_ccv.bytes_this_ack = (th_ack - tp->snd_una);
4582 if ((recovery) && (rack->r_ctl.rc_early_recovery_segs)) {
4585 max = rack->r_ctl.rc_early_recovery_segs * ctf_fixed_maxseg(tp);
4586 if (tp->t_ccv.bytes_this_ack > max) {
4587 tp->t_ccv.bytes_this_ack = max;
4591 stats_voi_update_abs_s32(tp->t_stats, VOI_TCP_CALCFRWINDIFF,
4592 ((int32_t)rack->r_ctl.cwnd_to_use) - tp->snd_wnd);
4594 quality = RACK_QUALITY_NONE;
4595 if ((tp->t_flags & TF_GPUTINPROG) &&
4596 rack_enough_for_measurement(tp, rack, th_ack, &quality)) {
4597 /* Measure the Goodput */
4598 rack_do_goodput_measurement(tp, rack, th_ack, __LINE__, quality);
4599 #ifdef NETFLIX_PEAKRATE
4600 if ((type == CC_ACK) &&
4601 (tp->t_maxpeakrate)) {
4603 * We update t_peakrate_thr. This gives us roughly
4604 * one update per round trip time. Note
4605 * it will only be used if pace_always is off i.e
4606 * we don't do this for paced flows.
4608 rack_update_peakrate_thr(tp);
4612 /* Which way our we limited, if not cwnd limited no advance in CA */
4613 if (tp->snd_cwnd <= tp->snd_wnd)
4614 tp->t_ccv.flags |= CCF_CWND_LIMITED;
4616 tp->t_ccv.flags &= ~CCF_CWND_LIMITED;
4617 if (tp->snd_cwnd > tp->snd_ssthresh) {
4618 tp->t_bytes_acked += min(tp->t_ccv.bytes_this_ack,
4619 nsegs * V_tcp_abc_l_var * ctf_fixed_maxseg(tp));
4620 /* For the setting of a window past use the actual scwnd we are using */
4621 if (tp->t_bytes_acked >= rack->r_ctl.cwnd_to_use) {
4622 tp->t_bytes_acked -= rack->r_ctl.cwnd_to_use;
4623 tp->t_ccv.flags |= CCF_ABC_SENTAWND;
4626 tp->t_ccv.flags &= ~CCF_ABC_SENTAWND;
4627 tp->t_bytes_acked = 0;
4629 prior_cwnd = tp->snd_cwnd;
4630 if ((recovery == 0) || (rack_max_abc_post_recovery == 0) || rack->r_use_labc_for_rec ||
4631 (rack_client_low_buf && (rack->client_bufferlvl < rack_client_low_buf)))
4632 labc_to_use = rack->rc_labc;
4634 labc_to_use = rack_max_abc_post_recovery;
4635 if (rack_verbose_logging && (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
4636 union tcp_log_stackspecific log;
4639 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
4640 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
4641 log.u_bbr.flex1 = th_ack;
4642 log.u_bbr.flex2 = tp->t_ccv.flags;
4643 log.u_bbr.flex3 = tp->t_ccv.bytes_this_ack;
4644 log.u_bbr.flex4 = tp->t_ccv.nsegs;
4645 log.u_bbr.flex5 = labc_to_use;
4646 log.u_bbr.flex6 = prior_cwnd;
4647 log.u_bbr.flex7 = V_tcp_do_newsack;
4648 log.u_bbr.flex8 = 1;
4649 lgb = tcp_log_event_(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
4650 0, &log, false, NULL, NULL, 0, &tv);
4652 if (CC_ALGO(tp)->ack_received != NULL) {
4653 /* XXXLAS: Find a way to live without this */
4654 tp->t_ccv.curack = th_ack;
4655 tp->t_ccv.labc = labc_to_use;
4656 tp->t_ccv.flags |= CCF_USE_LOCAL_ABC;
4657 CC_ALGO(tp)->ack_received(&tp->t_ccv, type);
4660 lgb->tlb_stackinfo.u_bbr.flex6 = tp->snd_cwnd;
4662 if (rack->r_must_retran) {
4663 if (SEQ_GEQ(th_ack, rack->r_ctl.rc_snd_max_at_rto)) {
4665 * We now are beyond the rxt point so lets disable
4668 rack->r_ctl.rc_out_at_rto = 0;
4669 rack->r_must_retran = 0;
4670 } else if ((prior_cwnd + ctf_fixed_maxseg(tp)) <= tp->snd_cwnd) {
4672 * Only decrement the rc_out_at_rto if the cwnd advances
4673 * at least a whole segment. Otherwise next time the peer
4674 * acks, we won't be able to send this generaly happens
4675 * when we are in Congestion Avoidance.
4677 if (acked <= rack->r_ctl.rc_out_at_rto){
4678 rack->r_ctl.rc_out_at_rto -= acked;
4680 rack->r_ctl.rc_out_at_rto = 0;
4685 stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_LCWIN, rack->r_ctl.cwnd_to_use);
4687 if (rack->r_ctl.rc_rack_largest_cwnd < rack->r_ctl.cwnd_to_use) {
4688 rack->r_ctl.rc_rack_largest_cwnd = rack->r_ctl.cwnd_to_use;
4690 #ifdef NETFLIX_PEAKRATE
4691 /* we enforce max peak rate if it is set and we are not pacing */
4692 if ((rack->rc_always_pace == 0) &&
4693 tp->t_peakrate_thr &&
4694 (tp->snd_cwnd > tp->t_peakrate_thr)) {
4695 tp->snd_cwnd = tp->t_peakrate_thr;
4701 tcp_rack_partialack(struct tcpcb *tp)
4703 struct tcp_rack *rack;
4705 rack = (struct tcp_rack *)tp->t_fb_ptr;
4706 INP_WLOCK_ASSERT(tptoinpcb(tp));
4708 * If we are doing PRR and have enough
4709 * room to send <or> we are pacing and prr
4710 * is disabled we will want to see if we
4711 * can send data (by setting r_wanted_output to
4714 if ((rack->r_ctl.rc_prr_sndcnt > 0) ||
4716 rack->r_wanted_output = 1;
4720 rack_post_recovery(struct tcpcb *tp, uint32_t th_ack)
4722 struct tcp_rack *rack;
4725 orig_cwnd = tp->snd_cwnd;
4726 INP_WLOCK_ASSERT(tptoinpcb(tp));
4727 rack = (struct tcp_rack *)tp->t_fb_ptr;
4728 /* only alert CC if we alerted when we entered */
4729 if (CC_ALGO(tp)->post_recovery != NULL) {
4730 tp->t_ccv.curack = th_ack;
4731 CC_ALGO(tp)->post_recovery(&tp->t_ccv);
4732 if (tp->snd_cwnd < tp->snd_ssthresh) {
4734 * Rack has burst control and pacing
4735 * so lets not set this any lower than
4736 * snd_ssthresh per RFC-6582 (option 2).
4738 tp->snd_cwnd = tp->snd_ssthresh;
4741 if (rack_verbose_logging && (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
4742 union tcp_log_stackspecific log;
4745 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
4746 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
4747 log.u_bbr.flex1 = th_ack;
4748 log.u_bbr.flex2 = tp->t_ccv.flags;
4749 log.u_bbr.flex3 = tp->t_ccv.bytes_this_ack;
4750 log.u_bbr.flex4 = tp->t_ccv.nsegs;
4751 log.u_bbr.flex5 = V_tcp_abc_l_var;
4752 log.u_bbr.flex6 = orig_cwnd;
4753 log.u_bbr.flex7 = V_tcp_do_newsack;
4754 log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt;
4755 log.u_bbr.flex8 = 2;
4756 tcp_log_event_(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
4757 0, &log, false, NULL, NULL, 0, &tv);
4759 if ((rack->rack_no_prr == 0) &&
4760 (rack->no_prr_addback == 0) &&
4761 (rack->r_ctl.rc_prr_sndcnt > 0)) {
4763 * Suck the next prr cnt back into cwnd, but
4764 * only do that if we are not application limited.
4766 if (ctf_outstanding(tp) <= sbavail(&tptosocket(tp)->so_snd)) {
4768 * We are allowed to add back to the cwnd the amount we did
4770 * a) no_prr_addback is off.
4771 * b) we are not app limited
4772 * c) we are doing prr
4774 * d) it is bounded by rack_prr_addbackmax (if addback is 0, then none).
4776 tp->snd_cwnd += min((ctf_fixed_maxseg(tp) * rack_prr_addbackmax),
4777 rack->r_ctl.rc_prr_sndcnt);
4779 rack->r_ctl.rc_prr_sndcnt = 0;
4780 rack_log_to_prr(rack, 1, 0, __LINE__);
4782 rack_log_to_prr(rack, 14, orig_cwnd, __LINE__);
4783 tp->snd_recover = tp->snd_una;
4784 if (rack->r_ctl.dsack_persist) {
4785 rack->r_ctl.dsack_persist--;
4786 if (rack->r_ctl.num_dsack && (rack->r_ctl.dsack_persist == 0)) {
4787 rack->r_ctl.num_dsack = 0;
4789 rack_log_dsack_event(rack, 1, __LINE__, 0, 0);
4791 EXIT_RECOVERY(tp->t_flags);
4795 rack_cong_signal(struct tcpcb *tp, uint32_t type, uint32_t ack, int line)
4797 struct tcp_rack *rack;
4798 uint32_t ssthresh_enter, cwnd_enter, in_rec_at_entry, orig_cwnd;
4800 INP_WLOCK_ASSERT(tptoinpcb(tp));
4802 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_CSIG, type);
4804 if (IN_RECOVERY(tp->t_flags) == 0) {
4805 in_rec_at_entry = 0;
4806 ssthresh_enter = tp->snd_ssthresh;
4807 cwnd_enter = tp->snd_cwnd;
4809 in_rec_at_entry = 1;
4810 rack = (struct tcp_rack *)tp->t_fb_ptr;
4813 tp->t_flags &= ~TF_WASFRECOVERY;
4814 tp->t_flags &= ~TF_WASCRECOVERY;
4815 if (!IN_FASTRECOVERY(tp->t_flags)) {
4816 rack->r_ctl.rc_prr_delivered = 0;
4817 rack->r_ctl.rc_prr_out = 0;
4818 if (rack->rack_no_prr == 0) {
4819 rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
4820 rack_log_to_prr(rack, 2, in_rec_at_entry, line);
4822 rack->r_ctl.rc_prr_recovery_fs = tp->snd_max - tp->snd_una;
4823 tp->snd_recover = tp->snd_max;
4824 if (tp->t_flags2 & TF2_ECN_PERMIT)
4825 tp->t_flags2 |= TF2_ECN_SND_CWR;
4829 if (!IN_CONGRECOVERY(tp->t_flags) ||
4831 * Allow ECN reaction on ACK to CWR, if
4832 * that data segment was also CE marked.
4834 SEQ_GEQ(ack, tp->snd_recover)) {
4835 EXIT_CONGRECOVERY(tp->t_flags);
4836 KMOD_TCPSTAT_INC(tcps_ecn_rcwnd);
4837 tp->snd_recover = tp->snd_max + 1;
4838 if (tp->t_flags2 & TF2_ECN_PERMIT)
4839 tp->t_flags2 |= TF2_ECN_SND_CWR;
4844 tp->t_bytes_acked = 0;
4845 EXIT_RECOVERY(tp->t_flags);
4846 tp->snd_ssthresh = max(2, min(tp->snd_wnd, rack->r_ctl.cwnd_to_use) / 2 /
4847 ctf_fixed_maxseg(tp)) * ctf_fixed_maxseg(tp);
4848 orig_cwnd = tp->snd_cwnd;
4849 tp->snd_cwnd = ctf_fixed_maxseg(tp);
4850 rack_log_to_prr(rack, 16, orig_cwnd, line);
4851 if (tp->t_flags2 & TF2_ECN_PERMIT)
4852 tp->t_flags2 |= TF2_ECN_SND_CWR;
4855 KMOD_TCPSTAT_INC(tcps_sndrexmitbad);
4856 /* RTO was unnecessary, so reset everything. */
4857 tp->snd_cwnd = tp->snd_cwnd_prev;
4858 tp->snd_ssthresh = tp->snd_ssthresh_prev;
4859 tp->snd_recover = tp->snd_recover_prev;
4860 if (tp->t_flags & TF_WASFRECOVERY) {
4861 ENTER_FASTRECOVERY(tp->t_flags);
4862 tp->t_flags &= ~TF_WASFRECOVERY;
4864 if (tp->t_flags & TF_WASCRECOVERY) {
4865 ENTER_CONGRECOVERY(tp->t_flags);
4866 tp->t_flags &= ~TF_WASCRECOVERY;
4868 tp->snd_nxt = tp->snd_max;
4869 tp->t_badrxtwin = 0;
4872 if ((CC_ALGO(tp)->cong_signal != NULL) &&
4874 tp->t_ccv.curack = ack;
4875 CC_ALGO(tp)->cong_signal(&tp->t_ccv, type);
4877 if ((in_rec_at_entry == 0) && IN_RECOVERY(tp->t_flags)) {
4878 rack_log_to_prr(rack, 15, cwnd_enter, line);
4879 rack->r_ctl.dsack_byte_cnt = 0;
4880 rack->r_ctl.retran_during_recovery = 0;
4881 rack->r_ctl.rc_cwnd_at_erec = cwnd_enter;
4882 rack->r_ctl.rc_ssthresh_at_erec = ssthresh_enter;
4883 rack->r_ent_rec_ns = 1;
4888 rack_cc_after_idle(struct tcp_rack *rack, struct tcpcb *tp)
4892 INP_WLOCK_ASSERT(tptoinpcb(tp));
4894 #ifdef NETFLIX_STATS
4895 KMOD_TCPSTAT_INC(tcps_idle_restarts);
4896 if (tp->t_state == TCPS_ESTABLISHED)
4897 KMOD_TCPSTAT_INC(tcps_idle_estrestarts);
4899 if (CC_ALGO(tp)->after_idle != NULL)
4900 CC_ALGO(tp)->after_idle(&tp->t_ccv);
4902 if (tp->snd_cwnd == 1)
4903 i_cwnd = tp->t_maxseg; /* SYN(-ACK) lost */
4905 i_cwnd = rc_init_window(rack);
4908 * Being idle is no different than the initial window. If the cc
4909 * clamps it down below the initial window raise it to the initial
4912 if (tp->snd_cwnd < i_cwnd) {
4913 tp->snd_cwnd = i_cwnd;
4918 * Indicate whether this ack should be delayed. We can delay the ack if
4919 * following conditions are met:
4920 * - There is no delayed ack timer in progress.
4921 * - Our last ack wasn't a 0-sized window. We never want to delay
4922 * the ack that opens up a 0-sized window.
4923 * - LRO wasn't used for this segment. We make sure by checking that the
4924 * segment size is not larger than the MSS.
4925 * - Delayed acks are enabled or this is a half-synchronized T/TCP
4928 #define DELAY_ACK(tp, tlen) \
4929 (((tp->t_flags & TF_RXWIN0SENT) == 0) && \
4930 ((tp->t_flags & TF_DELACK) == 0) && \
4931 (tlen <= tp->t_maxseg) && \
4932 (tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN)))
4934 static struct rack_sendmap *
4935 rack_find_lowest_rsm(struct tcp_rack *rack)
4937 struct rack_sendmap *rsm;
4940 * Walk the time-order transmitted list looking for an rsm that is
4941 * not acked. This will be the one that was sent the longest time
4942 * ago that is still outstanding.
4944 TAILQ_FOREACH(rsm, &rack->r_ctl.rc_tmap, r_tnext) {
4945 if (rsm->r_flags & RACK_ACKED) {
4954 static struct rack_sendmap *
4955 rack_find_high_nonack(struct tcp_rack *rack, struct rack_sendmap *rsm)
4957 struct rack_sendmap *prsm;
4960 * Walk the sequence order list backward until we hit and arrive at
4961 * the highest seq not acked. In theory when this is called it
4962 * should be the last segment (which it was not).
4965 RB_FOREACH_REVERSE_FROM(prsm, rack_rb_tree_head, rsm) {
4966 if (prsm->r_flags & (RACK_ACKED | RACK_HAS_FIN)) {
4975 rack_calc_thresh_rack(struct tcp_rack *rack, uint32_t srtt, uint32_t cts)
4981 * lro is the flag we use to determine if we have seen reordering.
4982 * If it gets set we have seen reordering. The reorder logic either
4983 * works in one of two ways:
4985 * If reorder-fade is configured, then we track the last time we saw
4986 * re-ordering occur. If we reach the point where enough time as
4987 * passed we no longer consider reordering has occuring.
4989 * Or if reorder-face is 0, then once we see reordering we consider
4990 * the connection to alway be subject to reordering and just set lro
4993 * In the end if lro is non-zero we add the extra time for
4998 if (rack->r_ctl.rc_reorder_ts) {
4999 if (rack->r_ctl.rc_reorder_fade) {
5000 if (SEQ_GEQ(cts, rack->r_ctl.rc_reorder_ts)) {
5001 lro = cts - rack->r_ctl.rc_reorder_ts;
5004 * No time as passed since the last
5005 * reorder, mark it as reordering.
5010 /* Negative time? */
5013 if (lro > rack->r_ctl.rc_reorder_fade) {
5014 /* Turn off reordering seen too */
5015 rack->r_ctl.rc_reorder_ts = 0;
5019 /* Reodering does not fade */
5025 if (rack->rc_rack_tmr_std_based == 0) {
5026 thresh = srtt + rack->r_ctl.rc_pkt_delay;
5028 /* Standards based pkt-delay is 1/4 srtt */
5029 thresh = srtt + (srtt >> 2);
5031 if (lro && (rack->rc_rack_tmr_std_based == 0)) {
5032 /* It must be set, if not you get 1/4 rtt */
5033 if (rack->r_ctl.rc_reorder_shift)
5034 thresh += (srtt >> rack->r_ctl.rc_reorder_shift);
5036 thresh += (srtt >> 2);
5038 if (rack->rc_rack_use_dsack &&
5040 (rack->r_ctl.num_dsack > 0)) {
5042 * We only increase the reordering window if we
5043 * have seen reordering <and> we have a DSACK count.
5045 thresh += rack->r_ctl.num_dsack * (srtt >> 2);
5046 rack_log_dsack_event(rack, 4, __LINE__, srtt, thresh);
5048 /* SRTT * 2 is the ceiling */
5049 if (thresh > (srtt * 2)) {
5052 /* And we don't want it above the RTO max either */
5053 if (thresh > rack_rto_max) {
5054 thresh = rack_rto_max;
5056 rack_log_dsack_event(rack, 6, __LINE__, srtt, thresh);
5061 rack_calc_thresh_tlp(struct tcpcb *tp, struct tcp_rack *rack,
5062 struct rack_sendmap *rsm, uint32_t srtt)
5064 struct rack_sendmap *prsm;
5065 uint32_t thresh, len;
5070 if (rack->r_ctl.rc_tlp_threshold)
5071 thresh = srtt + (srtt / rack->r_ctl.rc_tlp_threshold);
5073 thresh = (srtt * 2);
5075 /* Get the previous sent packet, if any */
5076 segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
5077 len = rsm->r_end - rsm->r_start;
5078 if (rack->rack_tlp_threshold_use == TLP_USE_ID) {
5079 /* Exactly like the ID */
5080 if (((tp->snd_max - tp->snd_una) - rack->r_ctl.rc_sacked + rack->r_ctl.rc_holes_rxt) <= segsiz) {
5081 uint32_t alt_thresh;
5083 * Compensate for delayed-ack with the d-ack time.
5085 alt_thresh = srtt + (srtt / 2) + rack_delayed_ack_time;
5086 if (alt_thresh > thresh)
5087 thresh = alt_thresh;
5089 } else if (rack->rack_tlp_threshold_use == TLP_USE_TWO_ONE) {
5091 prsm = TAILQ_PREV(rsm, rack_head, r_tnext);
5092 if (prsm && (len <= segsiz)) {
5094 * Two packets outstanding, thresh should be (2*srtt) +
5095 * possible inter-packet delay (if any).
5097 uint32_t inter_gap = 0;
5100 idx = rsm->r_rtr_cnt - 1;
5101 nidx = prsm->r_rtr_cnt - 1;
5102 if (rsm->r_tim_lastsent[nidx] >= prsm->r_tim_lastsent[idx]) {
5103 /* Yes it was sent later (or at the same time) */
5104 inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx];
5106 thresh += inter_gap;
5107 } else if (len <= segsiz) {
5109 * Possibly compensate for delayed-ack.
5111 uint32_t alt_thresh;
5113 alt_thresh = srtt + (srtt / 2) + rack_delayed_ack_time;
5114 if (alt_thresh > thresh)
5115 thresh = alt_thresh;
5117 } else if (rack->rack_tlp_threshold_use == TLP_USE_TWO_TWO) {
5119 if (len <= segsiz) {
5120 uint32_t alt_thresh;
5122 * Compensate for delayed-ack with the d-ack time.
5124 alt_thresh = srtt + (srtt / 2) + rack_delayed_ack_time;
5125 if (alt_thresh > thresh)
5126 thresh = alt_thresh;
5129 /* Not above an RTO */
5130 if (thresh > tp->t_rxtcur) {
5131 thresh = tp->t_rxtcur;
5133 /* Not above a RTO max */
5134 if (thresh > rack_rto_max) {
5135 thresh = rack_rto_max;
5137 /* Apply user supplied min TLP */
5138 if (thresh < rack_tlp_min) {
5139 thresh = rack_tlp_min;
5145 rack_grab_rtt(struct tcpcb *tp, struct tcp_rack *rack)
5148 * We want the rack_rtt which is the
5149 * last rtt we measured. However if that
5150 * does not exist we fallback to the srtt (which
5151 * we probably will never do) and then as a last
5152 * resort we use RACK_INITIAL_RTO if no srtt is
5155 if (rack->rc_rack_rtt)
5156 return (rack->rc_rack_rtt);
5157 else if (tp->t_srtt == 0)
5158 return (RACK_INITIAL_RTO);
5159 return (tp->t_srtt);
5162 static struct rack_sendmap *
5163 rack_check_recovery_mode(struct tcpcb *tp, uint32_t tsused)
5166 * Check to see that we don't need to fall into recovery. We will
5167 * need to do so if our oldest transmit is past the time we should
5170 struct tcp_rack *rack;
5171 struct rack_sendmap *rsm;
5173 uint32_t srtt, thresh;
5175 rack = (struct tcp_rack *)tp->t_fb_ptr;
5176 if (RB_EMPTY(&rack->r_ctl.rc_mtree)) {
5179 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
5184 if (rsm->r_flags & RACK_ACKED) {
5185 rsm = rack_find_lowest_rsm(rack);
5189 idx = rsm->r_rtr_cnt - 1;
5190 srtt = rack_grab_rtt(tp, rack);
5191 thresh = rack_calc_thresh_rack(rack, srtt, tsused);
5192 if (TSTMP_LT(tsused, ((uint32_t)rsm->r_tim_lastsent[idx]))) {
5195 if ((tsused - ((uint32_t)rsm->r_tim_lastsent[idx])) < thresh) {
5198 /* Ok if we reach here we are over-due and this guy can be sent */
5199 rack_cong_signal(tp, CC_NDUPACK, tp->snd_una, __LINE__);
5204 rack_get_persists_timer_val(struct tcpcb *tp, struct tcp_rack *rack)
5210 t = (tp->t_srtt + (tp->t_rttvar << 2));
5211 RACK_TCPT_RANGESET(tt, t * tcp_backoff[tp->t_rxtshift],
5212 rack_persist_min, rack_persist_max, rack->r_ctl.timer_slop);
5213 rack->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT;
5214 ret_val = (uint32_t)tt;
5219 rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int sup_rack)
5222 * Start the FR timer, we do this based on getting the first one in
5223 * the rc_tmap. Note that if its NULL we must stop the timer. in all
5224 * events we need to stop the running timer (if its running) before
5225 * starting the new one.
5227 uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse;
5230 int32_t is_tlp_timer = 0;
5231 struct rack_sendmap *rsm;
5233 if (rack->t_timers_stopped) {
5234 /* All timers have been stopped none are to run */
5237 if (rack->rc_in_persist) {
5238 /* We can't start any timer in persists */
5239 return (rack_get_persists_timer_val(tp, rack));
5241 rack->rc_on_min_to = 0;
5242 if ((tp->t_state < TCPS_ESTABLISHED) ||
5243 ((tp->t_flags & TF_SACK_PERMIT) == 0)) {
5246 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
5247 if ((rsm == NULL) || sup_rack) {
5248 /* Nothing on the send map or no rack */
5250 time_since_sent = 0;
5251 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
5254 * Should we discount the RTX timer any?
5256 * We want to discount it the smallest amount.
5257 * If a timer (Rack/TLP or RXT) has gone off more
5258 * recently thats the discount we want to use (now - timer time).
5259 * If the retransmit of the oldest packet was more recent then
5260 * we want to use that (now - oldest-packet-last_transmit_time).
5263 idx = rsm->r_rtr_cnt - 1;
5264 if (TSTMP_GEQ(rack->r_ctl.rc_tlp_rxt_last_time, ((uint32_t)rsm->r_tim_lastsent[idx])))
5265 tstmp_touse = (uint32_t)rack->r_ctl.rc_tlp_rxt_last_time;
5267 tstmp_touse = (uint32_t)rsm->r_tim_lastsent[idx];
5268 if (TSTMP_GT(cts, tstmp_touse))
5269 time_since_sent = cts - tstmp_touse;
5271 if (SEQ_LT(tp->snd_una, tp->snd_max) ||
5272 sbavail(&tptosocket(tp)->so_snd)) {
5273 rack->r_ctl.rc_hpts_flags |= PACE_TMR_RXT;
5275 if (to > time_since_sent)
5276 to -= time_since_sent;
5278 to = rack->r_ctl.rc_min_to;
5281 /* Special case for KEEPINIT */
5282 if ((TCPS_HAVEESTABLISHED(tp->t_state) == 0) &&
5283 (TP_KEEPINIT(tp) != 0) &&
5286 * We have to put a ceiling on the rxt timer
5287 * of the keep-init timeout.
5289 uint32_t max_time, red;
5291 max_time = TICKS_2_USEC(TP_KEEPINIT(tp));
5292 if (TSTMP_GT(cts, (uint32_t)rsm->r_tim_lastsent[0])) {
5293 red = (cts - (uint32_t)rsm->r_tim_lastsent[0]);
5299 /* Reduce timeout to the keep value if needed */
5307 if (rsm->r_flags & RACK_ACKED) {
5308 rsm = rack_find_lowest_rsm(rack);
5314 if (rack->sack_attack_disable) {
5316 * We don't want to do
5317 * any TLP's if you are an attacker.
5318 * Though if you are doing what
5319 * is expected you may still have
5320 * SACK-PASSED marks.
5324 /* Convert from ms to usecs */
5325 if ((rsm->r_flags & RACK_SACK_PASSED) ||
5326 (rsm->r_flags & RACK_RWND_COLLAPSED) ||
5327 (rsm->r_dupack >= DUP_ACK_THRESHOLD)) {
5328 if ((tp->t_flags & TF_SENTFIN) &&
5329 ((tp->snd_max - tp->snd_una) == 1) &&
5330 (rsm->r_flags & RACK_HAS_FIN)) {
5332 * We don't start a rack timer if all we have is a
5337 if ((rack->use_rack_rr == 0) &&
5338 (IN_FASTRECOVERY(tp->t_flags)) &&
5339 (rack->rack_no_prr == 0) &&
5340 (rack->r_ctl.rc_prr_sndcnt < ctf_fixed_maxseg(tp))) {
5342 * We are not cheating, in recovery and
5343 * not enough ack's to yet get our next
5344 * retransmission out.
5346 * Note that classified attackers do not
5347 * get to use the rack-cheat.
5351 srtt = rack_grab_rtt(tp, rack);
5352 thresh = rack_calc_thresh_rack(rack, srtt, cts);
5353 idx = rsm->r_rtr_cnt - 1;
5354 exp = ((uint32_t)rsm->r_tim_lastsent[idx]) + thresh;
5355 if (SEQ_GEQ(exp, cts)) {
5357 if (to < rack->r_ctl.rc_min_to) {
5358 to = rack->r_ctl.rc_min_to;
5359 if (rack->r_rr_config == 3)
5360 rack->rc_on_min_to = 1;
5363 to = rack->r_ctl.rc_min_to;
5364 if (rack->r_rr_config == 3)
5365 rack->rc_on_min_to = 1;
5368 /* Ok we need to do a TLP not RACK */
5370 if ((rack->rc_tlp_in_progress != 0) &&
5371 (rack->r_ctl.rc_tlp_cnt_out >= rack_tlp_limit)) {
5373 * The previous send was a TLP and we have sent
5374 * N TLP's without sending new data.
5378 rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_tmap, rack_sendmap, r_tnext);
5380 /* We found no rsm to TLP with. */
5383 if (rsm->r_flags & RACK_HAS_FIN) {
5384 /* If its a FIN we dont do TLP */
5388 idx = rsm->r_rtr_cnt - 1;
5389 time_since_sent = 0;
5390 if (TSTMP_GEQ(((uint32_t)rsm->r_tim_lastsent[idx]), rack->r_ctl.rc_tlp_rxt_last_time))
5391 tstmp_touse = (uint32_t)rsm->r_tim_lastsent[idx];
5393 tstmp_touse = (uint32_t)rack->r_ctl.rc_tlp_rxt_last_time;
5394 if (TSTMP_GT(cts, tstmp_touse))
5395 time_since_sent = cts - tstmp_touse;
5398 if ((rack->rc_srtt_measure_made == 0) &&
5399 (tp->t_srtt == 1)) {
5401 * If another stack as run and set srtt to 1,
5402 * then the srtt was 0, so lets use the initial.
5404 srtt = RACK_INITIAL_RTO;
5406 srtt_cur = tp->t_srtt;
5410 srtt = RACK_INITIAL_RTO;
5412 * If the SRTT is not keeping up and the
5413 * rack RTT has spiked we want to use
5414 * the last RTT not the smoothed one.
5416 if (rack_tlp_use_greater &&
5418 (srtt < rack_grab_rtt(tp, rack))) {
5419 srtt = rack_grab_rtt(tp, rack);
5421 thresh = rack_calc_thresh_tlp(tp, rack, rsm, srtt);
5422 if (thresh > time_since_sent) {
5423 to = thresh - time_since_sent;
5425 to = rack->r_ctl.rc_min_to;
5426 rack_log_alt_to_to_cancel(rack,
5428 time_since_sent, /* flex2 */
5429 tstmp_touse, /* flex3 */
5430 rack->r_ctl.rc_tlp_rxt_last_time, /* flex4 */
5431 (uint32_t)rsm->r_tim_lastsent[idx],
5435 if (to < rack_tlp_min) {
5438 if (to > TICKS_2_USEC(TCPTV_REXMTMAX)) {
5440 * If the TLP time works out to larger than the max
5441 * RTO lets not do TLP.. just RTO.
5446 if (is_tlp_timer == 0) {
5447 rack->r_ctl.rc_hpts_flags |= PACE_TMR_RACK;
5449 rack->r_ctl.rc_hpts_flags |= PACE_TMR_TLP;
5457 rack_enter_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
5459 if (rack->rc_in_persist == 0) {
5460 if (tp->t_flags & TF_GPUTINPROG) {
5462 * Stop the goodput now, the calling of the
5463 * measurement function clears the flag.
5465 rack_do_goodput_measurement(tp, rack, tp->snd_una, __LINE__,
5466 RACK_QUALITY_PERSIST);
5468 #ifdef NETFLIX_SHARED_CWND
5469 if (rack->r_ctl.rc_scw) {
5470 tcp_shared_cwnd_idle(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
5471 rack->rack_scwnd_is_idle = 1;
5474 rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
5475 if (rack->r_ctl.rc_went_idle_time == 0)
5476 rack->r_ctl.rc_went_idle_time = 1;
5477 rack_timer_cancel(tp, rack, cts, __LINE__);
5478 rack->r_ctl.persist_lost_ends = 0;
5479 rack->probe_not_answered = 0;
5480 rack->forced_ack = 0;
5482 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
5483 rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
5484 rack->rc_in_persist = 1;
5489 rack_exit_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
5491 if (tcp_in_hpts(rack->rc_inp)) {
5492 tcp_hpts_remove(rack->rc_inp);
5493 rack->r_ctl.rc_hpts_flags = 0;
5495 #ifdef NETFLIX_SHARED_CWND
5496 if (rack->r_ctl.rc_scw) {
5497 tcp_shared_cwnd_active(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
5498 rack->rack_scwnd_is_idle = 0;
5501 if (rack->rc_gp_dyn_mul &&
5502 (rack->use_fixed_rate == 0) &&
5503 (rack->rc_always_pace)) {
5505 * Do we count this as if a probe-rtt just
5508 uint32_t time_idle, idle_min;
5510 time_idle = tcp_get_usecs(NULL) - rack->r_ctl.rc_went_idle_time;
5511 idle_min = rack_min_probertt_hold;
5512 if (rack_probertt_gpsrtt_cnt_div) {
5514 extra = (uint64_t)rack->r_ctl.rc_gp_srtt *
5515 (uint64_t)rack_probertt_gpsrtt_cnt_mul;
5516 extra /= (uint64_t)rack_probertt_gpsrtt_cnt_div;
5517 idle_min += (uint32_t)extra;
5519 if (time_idle >= idle_min) {
5520 /* Yes, we count it as a probe-rtt. */
5523 us_cts = tcp_get_usecs(NULL);
5524 if (rack->in_probe_rtt == 0) {
5525 rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
5526 rack->r_ctl.rc_time_probertt_entered = rack->r_ctl.rc_lower_rtt_us_cts;
5527 rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts;
5528 rack->r_ctl.rc_time_of_last_probertt = rack->r_ctl.rc_lower_rtt_us_cts;
5530 rack_exit_probertt(rack, us_cts);
5534 rack->rc_in_persist = 0;
5535 rack->r_ctl.rc_went_idle_time = 0;
5537 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
5538 rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
5539 rack->r_ctl.rc_agg_delayed = 0;
5542 rack->r_ctl.rc_agg_early = 0;
5546 rack_log_hpts_diag(struct tcp_rack *rack, uint32_t cts,
5547 struct hpts_diag *diag, struct timeval *tv)
5549 if (rack_verbose_logging && rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
5550 union tcp_log_stackspecific log;
5552 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
5553 log.u_bbr.flex1 = diag->p_nxt_slot;
5554 log.u_bbr.flex2 = diag->p_cur_slot;
5555 log.u_bbr.flex3 = diag->slot_req;
5556 log.u_bbr.flex4 = diag->inp_hptsslot;
5557 log.u_bbr.flex5 = diag->slot_remaining;
5558 log.u_bbr.flex6 = diag->need_new_to;
5559 log.u_bbr.flex7 = diag->p_hpts_active;
5560 log.u_bbr.flex8 = diag->p_on_min_sleep;
5561 /* Hijack other fields as needed */
5562 log.u_bbr.epoch = diag->have_slept;
5563 log.u_bbr.lt_epoch = diag->yet_to_sleep;
5564 log.u_bbr.pkts_out = diag->co_ret;
5565 log.u_bbr.applimited = diag->hpts_sleep_time;
5566 log.u_bbr.delivered = diag->p_prev_slot;
5567 log.u_bbr.inflight = diag->p_runningslot;
5568 log.u_bbr.bw_inuse = diag->wheel_slot;
5569 log.u_bbr.rttProp = diag->wheel_cts;
5570 log.u_bbr.timeStamp = cts;
5571 log.u_bbr.delRate = diag->maxslots;
5572 log.u_bbr.cur_del_rate = diag->p_curtick;
5573 log.u_bbr.cur_del_rate <<= 32;
5574 log.u_bbr.cur_del_rate |= diag->p_lasttick;
5575 TCP_LOG_EVENTP(rack->rc_tp, NULL,
5576 &rack->rc_inp->inp_socket->so_rcv,
5577 &rack->rc_inp->inp_socket->so_snd,
5578 BBR_LOG_HPTSDIAG, 0,
5579 0, &log, false, tv);
5585 rack_log_wakeup(struct tcpcb *tp, struct tcp_rack *rack, struct sockbuf *sb, uint32_t len, int type)
5587 if (rack_verbose_logging && rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
5588 union tcp_log_stackspecific log;
5591 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
5592 log.u_bbr.flex1 = sb->sb_flags;
5593 log.u_bbr.flex2 = len;
5594 log.u_bbr.flex3 = sb->sb_state;
5595 log.u_bbr.flex8 = type;
5596 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
5597 TCP_LOG_EVENTP(rack->rc_tp, NULL,
5598 &rack->rc_inp->inp_socket->so_rcv,
5599 &rack->rc_inp->inp_socket->so_snd,
5601 len, &log, false, &tv);
5606 rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts,
5607 int32_t slot, uint32_t tot_len_this_send, int sup_rack)
5609 struct hpts_diag diag;
5610 struct inpcb *inp = tptoinpcb(tp);
5612 uint32_t delayed_ack = 0;
5613 uint32_t hpts_timeout;
5614 uint32_t entry_slot = slot;
5619 if ((tp->t_state == TCPS_CLOSED) ||
5620 (tp->t_state == TCPS_LISTEN)) {
5623 if (tcp_in_hpts(inp)) {
5624 /* Already on the pacer */
5627 stopped = rack->rc_tmr_stopped;
5628 if (stopped && TSTMP_GT(rack->r_ctl.rc_timer_exp, cts)) {
5629 left = rack->r_ctl.rc_timer_exp - cts;
5631 rack->r_ctl.rc_timer_exp = 0;
5632 rack->r_ctl.rc_hpts_flags = 0;
5633 us_cts = tcp_get_usecs(&tv);
5634 /* Now early/late accounting */
5635 rack_log_pacing_delay_calc(rack, entry_slot, slot, 0, 0, 0, 26, __LINE__, NULL, 0);
5636 if (rack->r_early && (rack->rc_ack_can_sendout_data == 0)) {
5638 * We have a early carry over set,
5639 * we can always add more time so we
5640 * can always make this compensation.
5642 * Note if ack's are allowed to wake us do not
5643 * penalize the next timer for being awoke
5644 * by an ack aka the rc_agg_early (non-paced mode).
5646 slot += rack->r_ctl.rc_agg_early;
5648 rack->r_ctl.rc_agg_early = 0;
5652 * This is harder, we can
5653 * compensate some but it
5654 * really depends on what
5655 * the current pacing time is.
5657 if (rack->r_ctl.rc_agg_delayed >= slot) {
5659 * We can't compensate for it all.
5660 * And we have to have some time
5661 * on the clock. We always have a min
5662 * 10 slots (10 x 10 i.e. 100 usecs).
5664 if (slot <= HPTS_TICKS_PER_SLOT) {
5666 rack->r_ctl.rc_agg_delayed += (HPTS_TICKS_PER_SLOT - slot);
5667 slot = HPTS_TICKS_PER_SLOT;
5669 /* We take off some */
5670 rack->r_ctl.rc_agg_delayed -= (slot - HPTS_TICKS_PER_SLOT);
5671 slot = HPTS_TICKS_PER_SLOT;
5674 slot -= rack->r_ctl.rc_agg_delayed;
5675 rack->r_ctl.rc_agg_delayed = 0;
5676 /* Make sure we have 100 useconds at minimum */
5677 if (slot < HPTS_TICKS_PER_SLOT) {
5678 rack->r_ctl.rc_agg_delayed = HPTS_TICKS_PER_SLOT - slot;
5679 slot = HPTS_TICKS_PER_SLOT;
5681 if (rack->r_ctl.rc_agg_delayed == 0)
5686 /* We are pacing too */
5687 rack->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT;
5689 hpts_timeout = rack_timer_start(tp, rack, cts, sup_rack);
5690 #ifdef NETFLIX_EXP_DETECTION
5691 if (rack->sack_attack_disable &&
5692 (slot < tcp_sad_pacing_interval)) {
5694 * We have a potential attacker on
5695 * the line. We have possibly some
5696 * (or now) pacing time set. We want to
5697 * slow down the processing of sacks by some
5698 * amount (if it is an attacker). Set the default
5699 * slot for attackers in place (unless the orginal
5700 * interval is longer). Its stored in
5701 * micro-seconds, so lets convert to msecs.
5703 slot = tcp_sad_pacing_interval;
5706 if (tp->t_flags & TF_DELACK) {
5707 delayed_ack = TICKS_2_USEC(tcp_delacktime);
5708 rack->r_ctl.rc_hpts_flags |= PACE_TMR_DELACK;
5710 if (delayed_ack && ((hpts_timeout == 0) ||
5711 (delayed_ack < hpts_timeout)))
5712 hpts_timeout = delayed_ack;
5714 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK;
5716 * If no timers are going to run and we will fall off the hptsi
5717 * wheel, we resort to a keep-alive timer if its configured.
5719 if ((hpts_timeout == 0) &&
5721 if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) &&
5722 (tp->t_state <= TCPS_CLOSING)) {
5724 * Ok we have no timer (persists, rack, tlp, rxt or
5725 * del-ack), we don't have segments being paced. So
5726 * all that is left is the keepalive timer.
5728 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
5729 /* Get the established keep-alive time */
5730 hpts_timeout = TICKS_2_USEC(TP_KEEPIDLE(tp));
5733 * Get the initial setup keep-alive time,
5734 * note that this is probably not going to
5735 * happen, since rack will be running a rxt timer
5736 * if a SYN of some sort is outstanding. It is
5737 * actually handled in rack_timeout_rxt().
5739 hpts_timeout = TICKS_2_USEC(TP_KEEPINIT(tp));
5741 rack->r_ctl.rc_hpts_flags |= PACE_TMR_KEEP;
5742 if (rack->in_probe_rtt) {
5744 * We want to instead not wake up a long time from
5745 * now but to wake up about the time we would
5746 * exit probe-rtt and initiate a keep-alive ack.
5747 * This will get us out of probe-rtt and update
5750 hpts_timeout = rack_min_probertt_hold;
5754 if (left && (stopped & (PACE_TMR_KEEP | PACE_TMR_DELACK)) ==
5755 (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK)) {
5757 * RACK, TLP, persists and RXT timers all are restartable
5758 * based on actions input .. i.e we received a packet (ack
5759 * or sack) and that changes things (rw, or snd_una etc).
5760 * Thus we can restart them with a new value. For
5761 * keep-alive, delayed_ack we keep track of what was left
5762 * and restart the timer with a smaller value.
5764 if (left < hpts_timeout)
5765 hpts_timeout = left;
5769 * Hack alert for now we can't time-out over 2,147,483
5770 * seconds (a bit more than 596 hours), which is probably ok
5773 if (hpts_timeout > 0x7ffffffe)
5774 hpts_timeout = 0x7ffffffe;
5775 rack->r_ctl.rc_timer_exp = cts + hpts_timeout;
5777 rack_log_pacing_delay_calc(rack, entry_slot, slot, hpts_timeout, 0, 0, 27, __LINE__, NULL, 0);
5778 if ((rack->gp_ready == 0) &&
5779 (rack->use_fixed_rate == 0) &&
5780 (hpts_timeout < slot) &&
5781 (rack->r_ctl.rc_hpts_flags & (PACE_TMR_TLP|PACE_TMR_RXT))) {
5783 * We have no good estimate yet for the
5784 * old clunky burst mitigation or the
5785 * real pacing. And the tlp or rxt is smaller
5786 * than the pacing calculation. Lets not
5787 * pace that long since we know the calculation
5788 * so far is not accurate.
5790 slot = hpts_timeout;
5793 * Turn off all the flags for queuing by default. The
5794 * flags have important meanings to what happens when
5795 * LRO interacts with the transport. Most likely (by default now)
5796 * mbuf_queueing and ack compression are on. So the transport
5797 * has a couple of flags that control what happens (if those
5798 * are not on then these flags won't have any effect since it
5799 * won't go through the queuing LRO path).
5801 * INP_MBUF_QUEUE_READY - This flags says that I am busy
5802 * pacing output, so don't disturb. But
5803 * it also means LRO can wake me if there
5804 * is a SACK arrival.
5806 * INP_DONT_SACK_QUEUE - This flag is used in conjunction
5807 * with the above flag (QUEUE_READY) and
5808 * when present it says don't even wake me
5809 * if a SACK arrives.
5811 * The idea behind these flags is that if we are pacing we
5812 * set the MBUF_QUEUE_READY and only get woken up if
5813 * a SACK arrives (which could change things) or if
5814 * our pacing timer expires. If, however, we have a rack
5815 * timer running, then we don't even want a sack to wake
5816 * us since the rack timer has to expire before we can send.
5818 * Other cases should usually have none of the flags set
5819 * so LRO can call into us.
5821 inp->inp_flags2 &= ~(INP_DONT_SACK_QUEUE|INP_MBUF_QUEUE_READY);
5823 rack->r_ctl.rc_last_output_to = us_cts + slot;
5825 * A pacing timer (slot) is being set, in
5826 * such a case we cannot send (we are blocked by
5827 * the timer). So lets tell LRO that it should not
5828 * wake us unless there is a SACK. Note this only
5829 * will be effective if mbuf queueing is on or
5830 * compressed acks are being processed.
5832 inp->inp_flags2 |= INP_MBUF_QUEUE_READY;
5834 * But wait if we have a Rack timer running
5835 * even a SACK should not disturb us (with
5836 * the exception of r_rr_config 3).
5838 if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK) &&
5839 (rack->r_rr_config != 3))
5840 inp->inp_flags2 |= INP_DONT_SACK_QUEUE;
5841 if (rack->rc_ack_can_sendout_data) {
5843 * Ahh but wait, this is that special case
5844 * where the pacing timer can be disturbed
5845 * backout the changes (used for non-paced
5848 inp->inp_flags2 &= ~(INP_DONT_SACK_QUEUE|INP_MBUF_QUEUE_READY);
5850 if ((rack->use_rack_rr) &&
5851 (rack->r_rr_config < 2) &&
5852 ((hpts_timeout) && (hpts_timeout < slot))) {
5854 * Arrange for the hpts to kick back in after the
5855 * t-o if the t-o does not cause a send.
5857 (void)tcp_hpts_insert_diag(inp, HPTS_USEC_TO_SLOTS(hpts_timeout),
5859 rack_log_hpts_diag(rack, us_cts, &diag, &tv);
5860 rack_log_to_start(rack, cts, hpts_timeout, slot, 0);
5862 (void)tcp_hpts_insert_diag(inp, HPTS_USEC_TO_SLOTS(slot),
5864 rack_log_hpts_diag(rack, us_cts, &diag, &tv);
5865 rack_log_to_start(rack, cts, hpts_timeout, slot, 1);
5867 } else if (hpts_timeout) {
5869 * With respect to inp_flags2 here, lets let any new acks wake
5870 * us up here. Since we are not pacing (no pacing timer), output
5871 * can happen so we should let it. If its a Rack timer, then any inbound
5872 * packet probably won't change the sending (we will be blocked)
5873 * but it may change the prr stats so letting it in (the set defaults
5874 * at the start of this block) are good enough.
5876 (void)tcp_hpts_insert_diag(inp, HPTS_USEC_TO_SLOTS(hpts_timeout),
5878 rack_log_hpts_diag(rack, us_cts, &diag, &tv);
5879 rack_log_to_start(rack, cts, hpts_timeout, slot, 0);
5881 /* No timer starting */
5883 if (SEQ_GT(tp->snd_max, tp->snd_una)) {
5884 panic("tp:%p rack:%p tlts:%d cts:%u slot:%u pto:%u -- no timer started?",
5885 tp, rack, tot_len_this_send, cts, slot, hpts_timeout);
5889 rack->rc_tmr_stopped = 0;
5891 rack_log_type_bbrsnd(rack, tot_len_this_send, slot, us_cts, &tv);
5895 * RACK Timer, here we simply do logging and house keeping.
5896 * the normal rack_output() function will call the
5897 * appropriate thing to check if we need to do a RACK retransmit.
5898 * We return 1, saying don't proceed with rack_output only
5899 * when all timers have been stopped (destroyed PCB?).
5902 rack_timeout_rack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
5905 * This timer simply provides an internal trigger to send out data.
5906 * The check_recovery_mode call will see if there are needed
5907 * retransmissions, if so we will enter fast-recovery. The output
5908 * call may or may not do the same thing depending on sysctl
5911 struct rack_sendmap *rsm;
5913 if (tp->tt_flags & TT_STOPPED) {
5916 counter_u64_add(rack_to_tot, 1);
5917 if (rack->r_state && (rack->r_state != tp->t_state))
5918 rack_set_state(tp, rack);
5919 rack->rc_on_min_to = 0;
5920 rsm = rack_check_recovery_mode(tp, cts);
5921 rack_log_to_event(rack, RACK_TO_FRM_RACK, rsm);
5923 rack->r_ctl.rc_resend = rsm;
5924 rack->r_timer_override = 1;
5925 if (rack->use_rack_rr) {
5927 * Don't accumulate extra pacing delay
5928 * we are allowing the rack timer to
5929 * over-ride pacing i.e. rrr takes precedence
5930 * if the pacing interval is longer than the rrr
5931 * time (in other words we get the min pacing
5932 * time versus rrr pacing time).
5934 rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
5937 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK;
5939 /* restart a timer and return 1 */
5940 rack_start_hpts_timer(rack, tp, cts,
5948 rack_adjust_orig_mlen(struct rack_sendmap *rsm)
5950 if (rsm->m->m_len > rsm->orig_m_len) {
5952 * Mbuf grew, caused by sbcompress, our offset does
5955 rsm->orig_m_len = rsm->m->m_len;
5956 } else if (rsm->m->m_len < rsm->orig_m_len) {
5958 * Mbuf shrank, trimmed off the top by an ack, our
5961 rsm->soff -= (rsm->orig_m_len - rsm->m->m_len);
5962 rsm->orig_m_len = rsm->m->m_len;
5967 rack_setup_offset_for_rsm(struct rack_sendmap *src_rsm, struct rack_sendmap *rsm)
5972 if (src_rsm->m && (src_rsm->orig_m_len != src_rsm->m->m_len)) {
5973 /* Fix up the orig_m_len and possibly the mbuf offset */
5974 rack_adjust_orig_mlen(src_rsm);
5977 soff = src_rsm->soff + (src_rsm->r_end - src_rsm->r_start);
5978 while (soff >= m->m_len) {
5979 /* Move out past this mbuf */
5982 KASSERT((m != NULL),
5983 ("rsm:%p nrsm:%p hit at soff:%u null m",
5984 src_rsm, rsm, soff));
5988 rsm->orig_m_len = m->m_len;
5991 static __inline void
5992 rack_clone_rsm(struct tcp_rack *rack, struct rack_sendmap *nrsm,
5993 struct rack_sendmap *rsm, uint32_t start)
5997 nrsm->r_start = start;
5998 nrsm->r_end = rsm->r_end;
5999 nrsm->r_rtr_cnt = rsm->r_rtr_cnt;
6000 nrsm->r_flags = rsm->r_flags;
6001 nrsm->r_dupack = rsm->r_dupack;
6002 nrsm->r_no_rtt_allowed = rsm->r_no_rtt_allowed;
6003 nrsm->r_rtr_bytes = 0;
6004 nrsm->r_fas = rsm->r_fas;
6005 rsm->r_end = nrsm->r_start;
6006 nrsm->r_just_ret = rsm->r_just_ret;
6007 for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) {
6008 nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx];
6010 /* Now if we have SYN flag we keep it on the left edge */
6011 if (nrsm->r_flags & RACK_HAS_SYN)
6012 nrsm->r_flags &= ~RACK_HAS_SYN;
6013 /* Now if we have a FIN flag we keep it on the right edge */
6014 if (rsm->r_flags & RACK_HAS_FIN)
6015 rsm->r_flags &= ~RACK_HAS_FIN;
6016 /* Push bit must go to the right edge as well */
6017 if (rsm->r_flags & RACK_HAD_PUSH)
6018 rsm->r_flags &= ~RACK_HAD_PUSH;
6019 /* Clone over the state of the hw_tls flag */
6020 nrsm->r_hw_tls = rsm->r_hw_tls;
6022 * Now we need to find nrsm's new location in the mbuf chain
6023 * we basically calculate a new offset, which is soff +
6024 * how much is left in original rsm. Then we walk out the mbuf
6025 * chain to find the righ position, it may be the same mbuf
6028 KASSERT(((rsm->m != NULL) ||
6029 (rsm->r_flags & (RACK_HAS_SYN|RACK_HAS_FIN))),
6030 ("rsm:%p nrsm:%p rack:%p -- rsm->m is NULL?", rsm, nrsm, rack));
6032 rack_setup_offset_for_rsm(rsm, nrsm);
6035 static struct rack_sendmap *
6036 rack_merge_rsm(struct tcp_rack *rack,
6037 struct rack_sendmap *l_rsm,
6038 struct rack_sendmap *r_rsm)
6041 * We are merging two ack'd RSM's,
6042 * the l_rsm is on the left (lower seq
6043 * values) and the r_rsm is on the right
6044 * (higher seq value). The simplest way
6045 * to merge these is to move the right
6046 * one into the left. I don't think there
6047 * is any reason we need to try to find
6048 * the oldest (or last oldest retransmitted).
6051 struct rack_sendmap *rm;
6053 rack_log_map_chg(rack->rc_tp, rack, NULL,
6054 l_rsm, r_rsm, MAP_MERGE, r_rsm->r_end, __LINE__);
6055 l_rsm->r_end = r_rsm->r_end;
6056 if (l_rsm->r_dupack < r_rsm->r_dupack)
6057 l_rsm->r_dupack = r_rsm->r_dupack;
6058 if (r_rsm->r_rtr_bytes)
6059 l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes;
6060 if (r_rsm->r_in_tmap) {
6061 /* This really should not happen */
6062 TAILQ_REMOVE(&rack->r_ctl.rc_tmap, r_rsm, r_tnext);
6063 r_rsm->r_in_tmap = 0;
6067 if (r_rsm->r_flags & RACK_HAS_FIN)
6068 l_rsm->r_flags |= RACK_HAS_FIN;
6069 if (r_rsm->r_flags & RACK_TLP)
6070 l_rsm->r_flags |= RACK_TLP;
6071 if (r_rsm->r_flags & RACK_RWND_COLLAPSED)
6072 l_rsm->r_flags |= RACK_RWND_COLLAPSED;
6073 if ((r_rsm->r_flags & RACK_APP_LIMITED) &&
6074 ((l_rsm->r_flags & RACK_APP_LIMITED) == 0)) {
6076 * If both are app-limited then let the
6077 * free lower the count. If right is app
6078 * limited and left is not, transfer.
6080 l_rsm->r_flags |= RACK_APP_LIMITED;
6081 r_rsm->r_flags &= ~RACK_APP_LIMITED;
6082 if (r_rsm == rack->r_ctl.rc_first_appl)
6083 rack->r_ctl.rc_first_appl = l_rsm;
6086 (void)RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, r_rsm);
6088 rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, r_rsm);
6090 panic("removing head in rack:%p rsm:%p rm:%p",
6094 if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) {
6095 /* Transfer the split limit to the map we free */
6096 r_rsm->r_limit_type = l_rsm->r_limit_type;
6097 l_rsm->r_limit_type = 0;
6099 rack_free(rack, r_rsm);
6104 * TLP Timer, here we simply setup what segment we want to
6105 * have the TLP expire on, the normal rack_output() will then
6108 * We return 1, saying don't proceed with rack_output only
6109 * when all timers have been stopped (destroyed PCB?).
6112 rack_timeout_tlp(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, uint8_t *doing_tlp)
6117 struct rack_sendmap *rsm = NULL;
6119 struct rack_sendmap *insret;
6121 struct socket *so = tptosocket(tp);
6123 uint32_t out, avail;
6124 int collapsed_win = 0;
6126 if (tp->tt_flags & TT_STOPPED) {
6129 if (TSTMP_LT(cts, rack->r_ctl.rc_timer_exp)) {
6130 /* Its not time yet */
6133 if (ctf_progress_timeout_check(tp, true)) {
6134 rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
6135 return (-ETIMEDOUT); /* tcp_drop() */
6138 * A TLP timer has expired. We have been idle for 2 rtts. So we now
6139 * need to figure out how to force a full MSS segment out.
6141 rack_log_to_event(rack, RACK_TO_FRM_TLP, NULL);
6142 rack->r_ctl.retran_during_recovery = 0;
6143 rack->r_ctl.dsack_byte_cnt = 0;
6144 counter_u64_add(rack_tlp_tot, 1);
6145 if (rack->r_state && (rack->r_state != tp->t_state))
6146 rack_set_state(tp, rack);
6147 avail = sbavail(&so->so_snd);
6148 out = tp->snd_max - tp->snd_una;
6149 if ((out > tp->snd_wnd) || rack->rc_has_collapsed) {
6150 /* special case, we need a retransmission */
6154 if (rack->r_ctl.dsack_persist && (rack->r_ctl.rc_tlp_cnt_out >= 1)) {
6155 rack->r_ctl.dsack_persist--;
6156 if (rack->r_ctl.num_dsack && (rack->r_ctl.dsack_persist == 0)) {
6157 rack->r_ctl.num_dsack = 0;
6159 rack_log_dsack_event(rack, 1, __LINE__, 0, 0);
6161 if ((tp->t_flags & TF_GPUTINPROG) &&
6162 (rack->r_ctl.rc_tlp_cnt_out == 1)) {
6164 * If this is the second in a row
6165 * TLP and we are doing a measurement
6166 * its time to abandon the measurement.
6167 * Something is likely broken on
6168 * the clients network and measuring a
6169 * broken network does us no good.
6171 tp->t_flags &= ~TF_GPUTINPROG;
6172 rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) /*flex2*/,
6173 rack->r_ctl.rc_gp_srtt /*flex1*/,
6175 0, 0, 18, __LINE__, NULL, 0);
6178 * Check our send oldest always settings, and if
6179 * there is an oldest to send jump to the need_retran.
6181 if (rack_always_send_oldest && (TAILQ_EMPTY(&rack->r_ctl.rc_tmap) == 0))
6185 /* New data is available */
6187 if (amm > ctf_fixed_maxseg(tp)) {
6188 amm = ctf_fixed_maxseg(tp);
6189 if ((amm + out) > tp->snd_wnd) {
6190 /* We are rwnd limited */
6193 } else if (amm < ctf_fixed_maxseg(tp)) {
6194 /* not enough to fill a MTU */
6197 if (IN_FASTRECOVERY(tp->t_flags)) {
6199 if (rack->rack_no_prr == 0) {
6200 if (out + amm <= tp->snd_wnd) {
6201 rack->r_ctl.rc_prr_sndcnt = amm;
6202 rack->r_ctl.rc_tlp_new_data = amm;
6203 rack_log_to_prr(rack, 4, 0, __LINE__);
6208 /* Set the send-new override */
6209 if (out + amm <= tp->snd_wnd)
6210 rack->r_ctl.rc_tlp_new_data = amm;
6214 rack->r_ctl.rc_tlpsend = NULL;
6215 counter_u64_add(rack_tlp_newdata, 1);
6220 * Ok we need to arrange the last un-acked segment to be re-sent, or
6221 * optionally the first un-acked segment.
6223 if (collapsed_win == 0) {
6224 if (rack_always_send_oldest)
6225 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
6227 rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
6228 if (rsm && (rsm->r_flags & (RACK_ACKED | RACK_HAS_FIN))) {
6229 rsm = rack_find_high_nonack(rack, rsm);
6234 tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true);
6240 * We must find the last segment
6241 * that was acceptable by the client.
6243 RB_FOREACH_REVERSE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
6244 if ((rsm->r_flags & RACK_RWND_COLLAPSED) == 0) {
6250 /* None? if so send the first */
6251 rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
6254 tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true);
6260 if ((rsm->r_end - rsm->r_start) > ctf_fixed_maxseg(tp)) {
6262 * We need to split this the last segment in two.
6264 struct rack_sendmap *nrsm;
6266 nrsm = rack_alloc_full_limit(rack);
6269 * No memory to split, we will just exit and punt
6270 * off to the RXT timer.
6274 rack_clone_rsm(rack, nrsm, rsm,
6275 (rsm->r_end - ctf_fixed_maxseg(tp)));
6276 rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SPLIT, 0, __LINE__);
6278 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
6280 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
6281 if (insret != NULL) {
6282 panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
6283 nrsm, insret, rack, rsm);
6286 if (rsm->r_in_tmap) {
6287 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
6288 nrsm->r_in_tmap = 1;
6292 rack->r_ctl.rc_tlpsend = rsm;
6294 /* Make sure output path knows we are doing a TLP */
6296 rack->r_timer_override = 1;
6297 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
6300 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP;
6305 * Delayed ack Timer, here we simply need to setup the
6306 * ACK_NOW flag and remove the DELACK flag. From there
6307 * the output routine will send the ack out.
6309 * We only return 1, saying don't proceed, if all timers
6310 * are stopped (destroyed PCB?).
6313 rack_timeout_delack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
6315 if (tp->tt_flags & TT_STOPPED) {
6318 rack_log_to_event(rack, RACK_TO_FRM_DELACK, NULL);
6319 tp->t_flags &= ~TF_DELACK;
6320 tp->t_flags |= TF_ACKNOW;
6321 KMOD_TCPSTAT_INC(tcps_delack);
6322 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK;
6327 * Persists timer, here we simply send the
6328 * same thing as a keepalive will.
6329 * the one byte send.
6331 * We only return 1, saying don't proceed, if all timers
6332 * are stopped (destroyed PCB?).
6335 rack_timeout_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
6337 struct tcptemp *t_template;
6340 if (tp->tt_flags & TT_STOPPED) {
6343 if (rack->rc_in_persist == 0)
6345 if (ctf_progress_timeout_check(tp, false)) {
6346 tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
6347 rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
6348 counter_u64_add(rack_persists_lost_ends, rack->r_ctl.persist_lost_ends);
6349 return (-ETIMEDOUT); /* tcp_drop() */
6352 * Persistence timer into zero window. Force a byte to be output, if
6355 KMOD_TCPSTAT_INC(tcps_persisttimeo);
6357 * Hack: if the peer is dead/unreachable, we do not time out if the
6358 * window is closed. After a full backoff, drop the connection if
6359 * the idle time (no responses to probes) reaches the maximum
6360 * backoff that we would use if retransmitting.
6362 if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
6363 (ticks - tp->t_rcvtime >= tcp_maxpersistidle ||
6364 TICKS_2_USEC(ticks - tp->t_rcvtime) >= RACK_REXMTVAL(tp) * tcp_totbackoff)) {
6365 KMOD_TCPSTAT_INC(tcps_persistdrop);
6366 tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
6367 counter_u64_add(rack_persists_lost_ends, rack->r_ctl.persist_lost_ends);
6368 retval = -ETIMEDOUT; /* tcp_drop() */
6371 if ((sbavail(&rack->rc_inp->inp_socket->so_snd) == 0) &&
6372 tp->snd_una == tp->snd_max)
6373 rack_exit_persist(tp, rack, cts);
6374 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT;
6376 * If the user has closed the socket then drop a persisting
6377 * connection after a much reduced timeout.
6379 if (tp->t_state > TCPS_CLOSE_WAIT &&
6380 (ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) {
6381 KMOD_TCPSTAT_INC(tcps_persistdrop);
6382 tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX);
6383 counter_u64_add(rack_persists_lost_ends, rack->r_ctl.persist_lost_ends);
6384 retval = -ETIMEDOUT; /* tcp_drop() */
6387 t_template = tcpip_maketemplate(rack->rc_inp);
6389 /* only set it if we were answered */
6390 if (rack->forced_ack == 0) {
6391 rack->forced_ack = 1;
6392 rack->r_ctl.forced_ack_ts = tcp_get_usecs(NULL);
6394 rack->probe_not_answered = 1;
6395 counter_u64_add(rack_persists_loss, 1);
6396 rack->r_ctl.persist_lost_ends++;
6398 counter_u64_add(rack_persists_sends, 1);
6399 tcp_respond(tp, t_template->tt_ipgen,
6400 &t_template->tt_t, (struct mbuf *)NULL,
6401 tp->rcv_nxt, tp->snd_una - 1, 0);
6402 /* This sends an ack */
6403 if (tp->t_flags & TF_DELACK)
6404 tp->t_flags &= ~TF_DELACK;
6405 free(t_template, M_TEMP);
6407 if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
6410 rack_log_to_event(rack, RACK_TO_FRM_PERSIST, NULL);
6411 rack_start_hpts_timer(rack, tp, cts,
6417 * If a keepalive goes off, we had no other timers
6418 * happening. We always return 1 here since this
6419 * routine either drops the connection or sends
6420 * out a segment with respond.
6423 rack_timeout_keepalive(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
6425 struct tcptemp *t_template;
6426 struct inpcb *inp = tptoinpcb(tp);
6428 if (tp->tt_flags & TT_STOPPED) {
6431 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP;
6432 rack_log_to_event(rack, RACK_TO_FRM_KEEP, NULL);
6434 * Keep-alive timer went off; send something or drop connection if
6435 * idle for too long.
6437 KMOD_TCPSTAT_INC(tcps_keeptimeo);
6438 if (tp->t_state < TCPS_ESTABLISHED)
6440 if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) &&
6441 tp->t_state <= TCPS_CLOSING) {
6442 if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp))
6445 * Send a packet designed to force a response if the peer is
6446 * up and reachable: either an ACK if the connection is
6447 * still alive, or an RST if the peer has closed the
6448 * connection due to timeout or reboot. Using sequence
6449 * number tp->snd_una-1 causes the transmitted zero-length
6450 * segment to lie outside the receive window; by the
6451 * protocol spec, this requires the correspondent TCP to
6454 KMOD_TCPSTAT_INC(tcps_keepprobe);
6455 t_template = tcpip_maketemplate(inp);
6457 if (rack->forced_ack == 0) {
6458 rack->forced_ack = 1;
6459 rack->r_ctl.forced_ack_ts = tcp_get_usecs(NULL);
6461 rack->probe_not_answered = 1;
6463 tcp_respond(tp, t_template->tt_ipgen,
6464 &t_template->tt_t, (struct mbuf *)NULL,
6465 tp->rcv_nxt, tp->snd_una - 1, 0);
6466 free(t_template, M_TEMP);
6469 rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
6472 KMOD_TCPSTAT_INC(tcps_keepdrops);
6473 tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX);
6474 return (-ETIMEDOUT); /* tcp_drop() */
6478 * Retransmit helper function, clear up all the ack
6479 * flags and take care of important book keeping.
6482 rack_remxt_tmr(struct tcpcb *tp)
6485 * The retransmit timer went off, all sack'd blocks must be
6488 struct rack_sendmap *rsm, *trsm = NULL;
6489 struct tcp_rack *rack;
6491 rack = (struct tcp_rack *)tp->t_fb_ptr;
6492 rack_timer_cancel(tp, rack, tcp_get_usecs(NULL), __LINE__);
6493 rack_log_to_event(rack, RACK_TO_FRM_TMR, NULL);
6494 if (rack->r_state && (rack->r_state != tp->t_state))
6495 rack_set_state(tp, rack);
6497 * Ideally we would like to be able to
6498 * mark SACK-PASS on anything not acked here.
6500 * However, if we do that we would burst out
6501 * all that data 1ms apart. This would be unwise,
6502 * so for now we will just let the normal rxt timer
6503 * and tlp timer take care of it.
6505 * Also we really need to stick them back in sequence
6506 * order. This way we send in the proper order and any
6507 * sacks that come floating in will "re-ack" the data.
6508 * To do this we zap the tmap with an INIT and then
6509 * walk through and place every rsm in the RB tree
6510 * back in its seq ordered place.
6512 TAILQ_INIT(&rack->r_ctl.rc_tmap);
6513 RB_FOREACH(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
6515 rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
6516 /* We must re-add it back to the tlist */
6518 TAILQ_INSERT_HEAD(&rack->r_ctl.rc_tmap, rsm, r_tnext);
6520 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, trsm, rsm, r_tnext);
6524 if (rsm->r_flags & RACK_ACKED)
6525 rsm->r_flags |= RACK_WAS_ACKED;
6526 rsm->r_flags &= ~(RACK_ACKED | RACK_SACK_PASSED | RACK_WAS_SACKPASS | RACK_RWND_COLLAPSED);
6527 rsm->r_flags |= RACK_MUST_RXT;
6529 /* Clear the count (we just un-acked them) */
6530 rack->r_ctl.rc_last_timeout_snduna = tp->snd_una;
6531 rack->r_ctl.rc_sacked = 0;
6532 rack->r_ctl.rc_sacklast = NULL;
6533 rack->r_ctl.rc_agg_delayed = 0;
6535 rack->r_ctl.rc_agg_early = 0;
6537 /* Clear the tlp rtx mark */
6538 rack->r_ctl.rc_resend = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
6539 if (rack->r_ctl.rc_resend != NULL)
6540 rack->r_ctl.rc_resend->r_flags |= RACK_TO_REXT;
6541 rack->r_ctl.rc_prr_sndcnt = 0;
6542 rack_log_to_prr(rack, 6, 0, __LINE__);
6543 rack->r_timer_override = 1;
6544 if ((((tp->t_flags & TF_SACK_PERMIT) == 0)
6545 #ifdef NETFLIX_EXP_DETECTION
6546 || (rack->sack_attack_disable != 0)
6548 ) && ((tp->t_flags & TF_SENTFIN) == 0)) {
6550 * For non-sack customers new data
6551 * needs to go out as retransmits until
6552 * we retransmit up to snd_max.
6554 rack->r_must_retran = 1;
6555 rack->r_ctl.rc_out_at_rto = ctf_flight_size(rack->rc_tp,
6556 rack->r_ctl.rc_sacked);
6558 rack->r_ctl.rc_snd_max_at_rto = tp->snd_max;
6562 rack_convert_rtts(struct tcpcb *tp)
6564 if (tp->t_srtt > 1) {
6567 val = tp->t_srtt >> TCP_RTT_SHIFT;
6568 frac = tp->t_srtt & 0x1f;
6569 tp->t_srtt = TICKS_2_USEC(val);
6571 * frac is the fractional part of the srtt (if any)
6572 * but its in ticks and every bit represents
6577 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE);
6579 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE));
6587 val = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
6588 frac = tp->t_rttvar & 0x1f;
6589 tp->t_rttvar = TICKS_2_USEC(val);
6591 * frac is the fractional part of the srtt (if any)
6592 * but its in ticks and every bit represents
6597 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE);
6599 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE));
6601 tp->t_rttvar += frac;
6604 tp->t_rxtcur = RACK_REXMTVAL(tp);
6605 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
6606 tp->t_rxtcur += TICKS_2_USEC(tcp_rexmit_slop);
6608 if (tp->t_rxtcur > rack_rto_max) {
6609 tp->t_rxtcur = rack_rto_max;
6614 rack_cc_conn_init(struct tcpcb *tp)
6616 struct tcp_rack *rack;
6619 rack = (struct tcp_rack *)tp->t_fb_ptr;
6623 * Now convert to rack's internal format,
6626 if ((srtt == 0) && (tp->t_srtt != 0))
6627 rack_convert_rtts(tp);
6629 * We want a chance to stay in slowstart as
6630 * we create a connection. TCP spec says that
6631 * initially ssthresh is infinite. For our
6632 * purposes that is the snd_wnd.
6634 if (tp->snd_ssthresh < tp->snd_wnd) {
6635 tp->snd_ssthresh = tp->snd_wnd;
6638 * We also want to assure a IW worth of
6639 * data can get inflight.
6641 if (rc_init_window(rack) < tp->snd_cwnd)
6642 tp->snd_cwnd = rc_init_window(rack);
6646 * Re-transmit timeout! If we drop the PCB we will return 1, otherwise
6647 * we will setup to retransmit the lowest seq number outstanding.
6650 rack_timeout_rxt(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts)
6652 struct inpcb *inp = tptoinpcb(tp);
6657 if (tp->tt_flags & TT_STOPPED) {
6660 if ((tp->t_flags & TF_GPUTINPROG) &&
6663 * We have had a second timeout
6664 * measurements on successive rxt's are not profitable.
6665 * It is unlikely to be of any use (the network is
6666 * broken or the client went away).
6668 tp->t_flags &= ~TF_GPUTINPROG;
6669 rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) /*flex2*/,
6670 rack->r_ctl.rc_gp_srtt /*flex1*/,
6672 0, 0, 18, __LINE__, NULL, 0);
6674 if (ctf_progress_timeout_check(tp, false)) {
6675 tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN);
6676 rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
6677 return (-ETIMEDOUT); /* tcp_drop() */
6679 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_RXT;
6680 rack->r_ctl.retran_during_recovery = 0;
6681 rack->rc_ack_required = 1;
6682 rack->r_ctl.dsack_byte_cnt = 0;
6683 if (IN_FASTRECOVERY(tp->t_flags))
6684 tp->t_flags |= TF_WASFRECOVERY;
6686 tp->t_flags &= ~TF_WASFRECOVERY;
6687 if (IN_CONGRECOVERY(tp->t_flags))
6688 tp->t_flags |= TF_WASCRECOVERY;
6690 tp->t_flags &= ~TF_WASCRECOVERY;
6691 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
6692 (tp->snd_una == tp->snd_max)) {
6693 /* Nothing outstanding .. nothing to do */
6696 if (rack->r_ctl.dsack_persist) {
6697 rack->r_ctl.dsack_persist--;
6698 if (rack->r_ctl.num_dsack && (rack->r_ctl.dsack_persist == 0)) {
6699 rack->r_ctl.num_dsack = 0;
6701 rack_log_dsack_event(rack, 1, __LINE__, 0, 0);
6704 * Rack can only run one timer at a time, so we cannot
6705 * run a KEEPINIT (gating SYN sending) and a retransmit
6706 * timer for the SYN. So if we are in a front state and
6707 * have a KEEPINIT timer we need to check the first transmit
6708 * against now to see if we have exceeded the KEEPINIT time
6711 if ((TCPS_HAVEESTABLISHED(tp->t_state) == 0) &&
6712 (TP_KEEPINIT(tp) != 0)) {
6713 struct rack_sendmap *rsm;
6715 rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
6717 /* Ok we have something outstanding to test keepinit with */
6718 if ((TSTMP_GT(cts, (uint32_t)rsm->r_tim_lastsent[0])) &&
6719 ((cts - (uint32_t)rsm->r_tim_lastsent[0]) >= TICKS_2_USEC(TP_KEEPINIT(tp)))) {
6720 /* We have exceeded the KEEPINIT time */
6721 tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX);
6727 * Retransmission timer went off. Message has not been acked within
6728 * retransmit interval. Back off to a longer retransmit interval
6729 * and retransmit one segment.
6732 if ((rack->r_ctl.rc_resend == NULL) ||
6733 ((rack->r_ctl.rc_resend->r_flags & RACK_RWND_COLLAPSED) == 0)) {
6735 * If the rwnd collapsed on
6736 * the one we are retransmitting
6737 * it does not count against the
6742 if (tp->t_rxtshift > TCP_MAXRXTSHIFT) {
6743 tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN);
6745 tp->t_rxtshift = TCP_MAXRXTSHIFT;
6746 KMOD_TCPSTAT_INC(tcps_timeoutdrop);
6747 /* XXXGL: previously t_softerror was casted to uint16_t */
6748 MPASS(tp->t_softerror >= 0);
6749 retval = tp->t_softerror ? -tp->t_softerror : -ETIMEDOUT;
6750 goto out; /* tcp_drop() */
6752 if (tp->t_state == TCPS_SYN_SENT) {
6754 * If the SYN was retransmitted, indicate CWND to be limited
6755 * to 1 segment in cc_conn_init().
6758 } else if (tp->t_rxtshift == 1) {
6760 * first retransmit; record ssthresh and cwnd so they can be
6761 * recovered if this turns out to be a "bad" retransmit. A
6762 * retransmit is considered "bad" if an ACK for this segment
6763 * is received within RTT/2 interval; the assumption here is
6764 * that the ACK was already in flight. See "On Estimating
6765 * End-to-End Network Path Properties" by Allman and Paxson
6768 tp->snd_cwnd_prev = tp->snd_cwnd;
6769 tp->snd_ssthresh_prev = tp->snd_ssthresh;
6770 tp->snd_recover_prev = tp->snd_recover;
6771 tp->t_badrxtwin = ticks + (USEC_2_TICKS(tp->t_srtt)/2);
6772 tp->t_flags |= TF_PREVVALID;
6773 } else if ((tp->t_flags & TF_RCVD_TSTMP) == 0)
6774 tp->t_flags &= ~TF_PREVVALID;
6775 KMOD_TCPSTAT_INC(tcps_rexmttimeo);
6776 if ((tp->t_state == TCPS_SYN_SENT) ||
6777 (tp->t_state == TCPS_SYN_RECEIVED))
6778 rexmt = RACK_INITIAL_RTO * tcp_backoff[tp->t_rxtshift];
6780 rexmt = max(rack_rto_min, (tp->t_srtt + (tp->t_rttvar << 2))) * tcp_backoff[tp->t_rxtshift];
6782 RACK_TCPT_RANGESET(tp->t_rxtcur, rexmt,
6783 max(rack_rto_min, rexmt), rack_rto_max, rack->r_ctl.timer_slop);
6785 * We enter the path for PLMTUD if connection is established or, if
6786 * connection is FIN_WAIT_1 status, reason for the last is that if
6787 * amount of data we send is very small, we could send it in couple
6788 * of packets and process straight to FIN. In that case we won't
6789 * catch ESTABLISHED state.
6792 isipv6 = (inp->inp_vflag & INP_IPV6) ? true : false;
6796 if (((V_tcp_pmtud_blackhole_detect == 1) ||
6797 (V_tcp_pmtud_blackhole_detect == 2 && !isipv6) ||
6798 (V_tcp_pmtud_blackhole_detect == 3 && isipv6)) &&
6799 ((tp->t_state == TCPS_ESTABLISHED) ||
6800 (tp->t_state == TCPS_FIN_WAIT_1))) {
6802 * Idea here is that at each stage of mtu probe (usually,
6803 * 1448 -> 1188 -> 524) should be given 2 chances to recover
6804 * before further clamping down. 'tp->t_rxtshift % 2 == 0'
6805 * should take care of that.
6807 if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) ==
6808 (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) &&
6809 (tp->t_rxtshift >= 2 && tp->t_rxtshift < 6 &&
6810 tp->t_rxtshift % 2 == 0)) {
6812 * Enter Path MTU Black-hole Detection mechanism: -
6813 * Disable Path MTU Discovery (IP "DF" bit). -
6814 * Reduce MTU to lower value than what we negotiated
6817 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) {
6818 /* Record that we may have found a black hole. */
6819 tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE;
6820 /* Keep track of previous MSS. */
6821 tp->t_pmtud_saved_maxseg = tp->t_maxseg;
6825 * Reduce the MSS to blackhole value or to the
6826 * default in an attempt to retransmit.
6830 tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) {
6831 /* Use the sysctl tuneable blackhole MSS. */
6832 tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss;
6833 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated);
6834 } else if (isipv6) {
6835 /* Use the default MSS. */
6836 tp->t_maxseg = V_tcp_v6mssdflt;
6838 * Disable Path MTU Discovery when we switch
6841 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
6842 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
6845 #if defined(INET6) && defined(INET)
6849 if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) {
6850 /* Use the sysctl tuneable blackhole MSS. */
6851 tp->t_maxseg = V_tcp_pmtud_blackhole_mss;
6852 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated);
6854 /* Use the default MSS. */
6855 tp->t_maxseg = V_tcp_mssdflt;
6857 * Disable Path MTU Discovery when we switch
6860 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
6861 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
6866 * If further retransmissions are still unsuccessful
6867 * with a lowered MTU, maybe this isn't a blackhole
6868 * and we restore the previous MSS and blackhole
6869 * detection flags. The limit '6' is determined by
6870 * giving each probe stage (1448, 1188, 524) 2
6871 * chances to recover.
6873 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) &&
6874 (tp->t_rxtshift >= 6)) {
6875 tp->t_flags2 |= TF2_PLPMTU_PMTUD;
6876 tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE;
6877 tp->t_maxseg = tp->t_pmtud_saved_maxseg;
6878 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_failed);
6883 * Disable RFC1323 and SACK if we haven't got any response to
6884 * our third SYN to work-around some broken terminal servers
6885 * (most of which have hopefully been retired) that have bad VJ
6886 * header compression code which trashes TCP segments containing
6887 * unknown-to-them TCP options.
6889 if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) &&
6890 (tp->t_rxtshift == 3))
6891 tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_SACK_PERMIT);
6893 * If we backed off this far, our srtt estimate is probably bogus.
6894 * Clobber it so we'll take the next rtt measurement as our srtt;
6895 * move the current srtt into rttvar to keep the current retransmit
6898 if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
6900 if ((inp->inp_vflag & INP_IPV6) != 0)
6905 tp->t_rttvar += tp->t_srtt;
6908 sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
6909 tp->snd_recover = tp->snd_max;
6910 tp->t_flags |= TF_ACKNOW;
6912 rack_cong_signal(tp, CC_RTO, tp->snd_una, __LINE__);
6918 rack_process_timers(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, uint8_t hpts_calling, uint8_t *doing_tlp)
6921 int32_t timers = (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK);
6923 if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
6924 (tp->t_flags & TF_GPUTINPROG)) {
6926 * We have a goodput in progress
6927 * and we have entered a late state.
6928 * Do we have enough data in the sb
6929 * to handle the GPUT request?
6933 bytes = tp->gput_ack - tp->gput_seq;
6934 if (SEQ_GT(tp->gput_seq, tp->snd_una))
6935 bytes += tp->gput_seq - tp->snd_una;
6936 if (bytes > sbavail(&tptosocket(tp)->so_snd)) {
6938 * There are not enough bytes in the socket
6939 * buffer that have been sent to cover this
6940 * measurement. Cancel it.
6942 rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) /*flex2*/,
6943 rack->r_ctl.rc_gp_srtt /*flex1*/,
6945 0, 0, 18, __LINE__, NULL, 0);
6946 tp->t_flags &= ~TF_GPUTINPROG;
6952 if (tp->t_state == TCPS_LISTEN) {
6953 /* no timers on listen sockets */
6954 if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)
6958 if ((timers & PACE_TMR_RACK) &&
6959 rack->rc_on_min_to) {
6961 * For the rack timer when we
6962 * are on a min-timeout (which means rrr_conf = 3)
6963 * we don't want to check the timer. It may
6964 * be going off for a pace and thats ok we
6965 * want to send the retransmit (if its ready).
6967 * If its on a normal rack timer (non-min) then
6968 * we will check if its expired.
6970 goto skip_time_check;
6972 if (TSTMP_LT(cts, rack->r_ctl.rc_timer_exp)) {
6975 if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
6977 rack_log_to_processing(rack, cts, ret, 0);
6980 if (hpts_calling == 0) {
6982 * A user send or queued mbuf (sack) has called us? We
6983 * return 0 and let the pacing guards
6984 * deal with it if they should or
6985 * should not cause a send.
6988 rack_log_to_processing(rack, cts, ret, 0);
6992 * Ok our timer went off early and we are not paced false
6993 * alarm, go back to sleep.
6996 left = rack->r_ctl.rc_timer_exp - cts;
6997 tcp_hpts_insert(tptoinpcb(tp), HPTS_MS_TO_SLOTS(left));
6998 rack_log_to_processing(rack, cts, ret, left);
7002 rack->rc_tmr_stopped = 0;
7003 rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK;
7004 if (timers & PACE_TMR_DELACK) {
7005 ret = rack_timeout_delack(tp, rack, cts);
7006 } else if (timers & PACE_TMR_RACK) {
7007 rack->r_ctl.rc_tlp_rxt_last_time = cts;
7008 rack->r_fast_output = 0;
7009 ret = rack_timeout_rack(tp, rack, cts);
7010 } else if (timers & PACE_TMR_TLP) {
7011 rack->r_ctl.rc_tlp_rxt_last_time = cts;
7012 ret = rack_timeout_tlp(tp, rack, cts, doing_tlp);
7013 } else if (timers & PACE_TMR_RXT) {
7014 rack->r_ctl.rc_tlp_rxt_last_time = cts;
7015 rack->r_fast_output = 0;
7016 ret = rack_timeout_rxt(tp, rack, cts);
7017 } else if (timers & PACE_TMR_PERSIT) {
7018 ret = rack_timeout_persist(tp, rack, cts);
7019 } else if (timers & PACE_TMR_KEEP) {
7020 ret = rack_timeout_keepalive(tp, rack, cts);
7022 rack_log_to_processing(rack, cts, ret, timers);
7027 rack_timer_cancel(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int line)
7030 uint32_t us_cts, flags_on_entry;
7031 uint8_t hpts_removed = 0;
7033 flags_on_entry = rack->r_ctl.rc_hpts_flags;
7034 us_cts = tcp_get_usecs(&tv);
7035 if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
7036 ((TSTMP_GEQ(us_cts, rack->r_ctl.rc_last_output_to)) ||
7037 ((tp->snd_max - tp->snd_una) == 0))) {
7038 tcp_hpts_remove(rack->rc_inp);
7040 /* If we were not delayed cancel out the flag. */
7041 if ((tp->snd_max - tp->snd_una) == 0)
7042 rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
7043 rack_log_to_cancel(rack, hpts_removed, line, us_cts, &tv, flags_on_entry);
7045 if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
7046 rack->rc_tmr_stopped = rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK;
7047 if (tcp_in_hpts(rack->rc_inp) &&
7048 ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0)) {
7050 * Canceling timer's when we have no output being
7051 * paced. We also must remove ourselves from the
7054 tcp_hpts_remove(rack->rc_inp);
7057 rack->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK);
7059 if (hpts_removed == 0)
7060 rack_log_to_cancel(rack, hpts_removed, line, us_cts, &tv, flags_on_entry);
7064 rack_timer_stop(struct tcpcb *tp, uint32_t timer_type)
7070 rack_stopall(struct tcpcb *tp)
7072 struct tcp_rack *rack;
7073 rack = (struct tcp_rack *)tp->t_fb_ptr;
7074 rack->t_timers_stopped = 1;
7079 rack_timer_activate(struct tcpcb *tp, uint32_t timer_type, uint32_t delta)
7085 rack_timer_active(struct tcpcb *tp, uint32_t timer_type)
7091 rack_stop_all_timers(struct tcpcb *tp)
7093 struct tcp_rack *rack;
7096 * Assure no timers are running.
7098 if (tcp_timer_active(tp, TT_PERSIST)) {
7099 /* We enter in persists, set the flag appropriately */
7100 rack = (struct tcp_rack *)tp->t_fb_ptr;
7101 rack->rc_in_persist = 1;
7103 tcp_timer_suspend(tp, TT_PERSIST);
7104 tcp_timer_suspend(tp, TT_REXMT);
7105 tcp_timer_suspend(tp, TT_KEEP);
7106 tcp_timer_suspend(tp, TT_DELACK);
7110 rack_update_rsm(struct tcpcb *tp, struct tcp_rack *rack,
7111 struct rack_sendmap *rsm, uint64_t ts, uint16_t add_flag)
7116 rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
7118 if (rsm->r_rtr_cnt > RACK_NUM_OF_RETRANS) {
7119 rsm->r_rtr_cnt = RACK_NUM_OF_RETRANS;
7120 rsm->r_flags |= RACK_OVERMAX;
7122 if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & RACK_TLP) == 0)) {
7123 rack->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start);
7124 rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start);
7126 idx = rsm->r_rtr_cnt - 1;
7127 rsm->r_tim_lastsent[idx] = ts;
7129 * Here we don't add in the len of send, since its already
7130 * in snduna <->snd_max.
7132 rsm->r_fas = ctf_flight_size(rack->rc_tp,
7133 rack->r_ctl.rc_sacked);
7134 if (rsm->r_flags & RACK_ACKED) {
7135 /* Problably MTU discovery messing with us */
7136 rsm->r_flags &= ~RACK_ACKED;
7137 rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
7139 if (rsm->r_in_tmap) {
7140 TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
7143 TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
7145 /* Take off the must retransmit flag, if its on */
7146 if (rsm->r_flags & RACK_MUST_RXT) {
7147 if (rack->r_must_retran)
7148 rack->r_ctl.rc_out_at_rto -= (rsm->r_end - rsm->r_start);
7149 if (SEQ_GEQ(rsm->r_end, rack->r_ctl.rc_snd_max_at_rto)) {
7151 * We have retransmitted all we need. Clear
7152 * any must retransmit flags.
7154 rack->r_must_retran = 0;
7155 rack->r_ctl.rc_out_at_rto = 0;
7157 rsm->r_flags &= ~RACK_MUST_RXT;
7159 if (rsm->r_flags & RACK_SACK_PASSED) {
7160 /* We have retransmitted due to the SACK pass */
7161 rsm->r_flags &= ~RACK_SACK_PASSED;
7162 rsm->r_flags |= RACK_WAS_SACKPASS;
7167 rack_update_entry(struct tcpcb *tp, struct tcp_rack *rack,
7168 struct rack_sendmap *rsm, uint64_t ts, int32_t *lenp, uint16_t add_flag)
7171 * We (re-)transmitted starting at rsm->r_start for some length
7172 * (possibly less than r_end.
7174 struct rack_sendmap *nrsm;
7176 struct rack_sendmap *insret;
7182 c_end = rsm->r_start + len;
7183 if (SEQ_GEQ(c_end, rsm->r_end)) {
7185 * We retransmitted the whole piece or more than the whole
7186 * slopping into the next rsm.
7188 rack_update_rsm(tp, rack, rsm, ts, add_flag);
7189 if (c_end == rsm->r_end) {
7195 /* Hangs over the end return whats left */
7196 act_len = rsm->r_end - rsm->r_start;
7197 *lenp = (len - act_len);
7198 return (rsm->r_end);
7200 /* We don't get out of this block. */
7203 * Here we retransmitted less than the whole thing which means we
7204 * have to split this into what was transmitted and what was not.
7206 nrsm = rack_alloc_full_limit(rack);
7209 * We can't get memory, so lets not proceed.
7215 * So here we are going to take the original rsm and make it what we
7216 * retransmitted. nrsm will be the tail portion we did not
7217 * retransmit. For example say the chunk was 1, 11 (10 bytes). And
7218 * we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to
7219 * 1, 6 and the new piece will be 6, 11.
7221 rack_clone_rsm(rack, nrsm, rsm, c_end);
7223 rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2);
7225 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
7227 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
7228 if (insret != NULL) {
7229 panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
7230 nrsm, insret, rack, rsm);
7233 if (rsm->r_in_tmap) {
7234 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
7235 nrsm->r_in_tmap = 1;
7237 rsm->r_flags &= (~RACK_HAS_FIN);
7238 rack_update_rsm(tp, rack, rsm, ts, add_flag);
7239 /* Log a split of rsm into rsm and nrsm */
7240 rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SPLIT, 0, __LINE__);
7246 rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len,
7247 uint32_t seq_out, uint16_t th_flags, int32_t err, uint64_t cts,
7248 struct rack_sendmap *hintrsm, uint16_t add_flag, struct mbuf *s_mb, uint32_t s_moff, int hw_tls)
7250 struct tcp_rack *rack;
7251 struct rack_sendmap *rsm, *nrsm, fe;
7253 struct rack_sendmap *insret;
7255 register uint32_t snd_max, snd_una;
7258 * Add to the RACK log of packets in flight or retransmitted. If
7259 * there is a TS option we will use the TS echoed, if not we will
7262 * Retransmissions will increment the count and move the ts to its
7263 * proper place. Note that if options do not include TS's then we
7264 * won't be able to effectively use the ACK for an RTT on a retran.
7266 * Notes about r_start and r_end. Lets consider a send starting at
7267 * sequence 1 for 10 bytes. In such an example the r_start would be
7268 * 1 (starting sequence) but the r_end would be r_start+len i.e. 11.
7269 * This means that r_end is actually the first sequence for the next
7274 * If err is set what do we do XXXrrs? should we not add the thing?
7275 * -- i.e. return if err != 0 or should we pretend we sent it? --
7276 * i.e. proceed with add ** do this for now.
7278 INP_WLOCK_ASSERT(tptoinpcb(tp));
7281 * We don't log errors -- we could but snd_max does not
7282 * advance in this case either.
7286 if (th_flags & TH_RST) {
7288 * We don't log resets and we return immediately from
7293 rack = (struct tcp_rack *)tp->t_fb_ptr;
7294 snd_una = tp->snd_una;
7295 snd_max = tp->snd_max;
7296 if (th_flags & (TH_SYN | TH_FIN)) {
7298 * The call to rack_log_output is made before bumping
7299 * snd_max. This means we can record one extra byte on a SYN
7300 * or FIN if seq_out is adding more on and a FIN is present
7301 * (and we are not resending).
7303 if ((th_flags & TH_SYN) && (seq_out == tp->iss))
7305 if (th_flags & TH_FIN)
7307 if (SEQ_LT(snd_max, tp->snd_nxt)) {
7309 * The add/update as not been done for the FIN/SYN
7312 snd_max = tp->snd_nxt;
7315 if (SEQ_LEQ((seq_out + len), snd_una)) {
7316 /* Are sending an old segment to induce an ack (keep-alive)? */
7319 if (SEQ_LT(seq_out, snd_una)) {
7320 /* huh? should we panic? */
7323 end = seq_out + len;
7325 if (SEQ_GEQ(end, seq_out))
7326 len = end - seq_out;
7331 /* We don't log zero window probes */
7334 if (IN_FASTRECOVERY(tp->t_flags)) {
7335 rack->r_ctl.rc_prr_out += len;
7337 /* First question is it a retransmission or new? */
7338 if (seq_out == snd_max) {
7341 rsm = rack_alloc(rack);
7344 * Hmm out of memory and the tcb got destroyed while
7349 if (th_flags & TH_FIN) {
7350 rsm->r_flags = RACK_HAS_FIN|add_flag;
7352 rsm->r_flags = add_flag;
7356 rsm->r_tim_lastsent[0] = cts;
7358 rsm->r_rtr_bytes = 0;
7359 if (th_flags & TH_SYN) {
7360 /* The data space is one beyond snd_una */
7361 rsm->r_flags |= RACK_HAS_SYN;
7363 rsm->r_start = seq_out;
7364 rsm->r_end = rsm->r_start + len;
7367 * save off the mbuf location that
7368 * sndmbuf_noadv returned (which is
7369 * where we started copying from)..
7374 * Here we do add in the len of send, since its not yet
7375 * reflected in in snduna <->snd_max
7377 rsm->r_fas = (ctf_flight_size(rack->rc_tp,
7378 rack->r_ctl.rc_sacked) +
7379 (rsm->r_end - rsm->r_start));
7380 /* rsm->m will be NULL if RACK_HAS_SYN or RACK_HAS_FIN is set */
7382 if (rsm->m->m_len <= rsm->soff) {
7384 * XXXrrs Question, will this happen?
7386 * If sbsndptr is set at the correct place
7387 * then s_moff should always be somewhere
7388 * within rsm->m. But if the sbsndptr was
7389 * off then that won't be true. If it occurs
7390 * we need to walkout to the correct location.
7395 while (lm->m_len <= rsm->soff) {
7396 rsm->soff -= lm->m_len;
7398 KASSERT(lm != NULL, ("%s rack:%p lm goes null orig_off:%u origmb:%p rsm->soff:%u",
7399 __func__, rack, s_moff, s_mb, rsm->soff));
7403 rsm->orig_m_len = rsm->m->m_len;
7405 rsm->orig_m_len = 0;
7406 rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
7408 rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_NEW, 0, __LINE__);
7410 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
7412 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
7413 if (insret != NULL) {
7414 panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
7415 nrsm, insret, rack, rsm);
7418 TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
7421 * Special case detection, is there just a single
7422 * packet outstanding when we are not in recovery?
7424 * If this is true mark it so.
7426 if ((IN_FASTRECOVERY(tp->t_flags) == 0) &&
7427 (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) == ctf_fixed_maxseg(tp))) {
7428 struct rack_sendmap *prsm;
7430 prsm = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
7432 prsm->r_one_out_nr = 1;
7437 * If we reach here its a retransmission and we need to find it.
7439 memset(&fe, 0, sizeof(fe));
7441 if (hintrsm && (hintrsm->r_start == seq_out)) {
7445 /* No hints sorry */
7448 if ((rsm) && (rsm->r_start == seq_out)) {
7449 seq_out = rack_update_entry(tp, rack, rsm, cts, &len, add_flag);
7456 /* Ok it was not the last pointer go through it the hard way. */
7458 fe.r_start = seq_out;
7459 rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
7461 if (rsm->r_start == seq_out) {
7462 seq_out = rack_update_entry(tp, rack, rsm, cts, &len, add_flag);
7469 if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) {
7470 /* Transmitted within this piece */
7472 * Ok we must split off the front and then let the
7473 * update do the rest
7475 nrsm = rack_alloc_full_limit(rack);
7477 rack_update_rsm(tp, rack, rsm, cts, add_flag);
7481 * copy rsm to nrsm and then trim the front of rsm
7482 * to not include this part.
7484 rack_clone_rsm(rack, nrsm, rsm, seq_out);
7485 rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SPLIT, 0, __LINE__);
7487 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
7489 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
7490 if (insret != NULL) {
7491 panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
7492 nrsm, insret, rack, rsm);
7495 if (rsm->r_in_tmap) {
7496 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
7497 nrsm->r_in_tmap = 1;
7499 rsm->r_flags &= (~RACK_HAS_FIN);
7500 seq_out = rack_update_entry(tp, rack, nrsm, cts, &len, add_flag);
7508 * Hmm not found in map did they retransmit both old and on into the
7511 if (seq_out == tp->snd_max) {
7513 } else if (SEQ_LT(seq_out, tp->snd_max)) {
7515 printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n",
7516 seq_out, len, tp->snd_una, tp->snd_max);
7517 printf("Starting Dump of all rack entries\n");
7518 RB_FOREACH(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
7519 printf("rsm:%p start:%u end:%u\n",
7520 rsm, rsm->r_start, rsm->r_end);
7522 printf("Dump complete\n");
7523 panic("seq_out not found rack:%p tp:%p",
7529 * Hmm beyond sndmax? (only if we are using the new rtt-pack
7532 panic("seq_out:%u(%d) is beyond snd_max:%u tp:%p",
7533 seq_out, len, tp->snd_max, tp);
7539 * Record one of the RTT updates from an ack into
7540 * our sample structure.
7544 tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt, uint32_t len, uint32_t us_rtt,
7545 int confidence, struct rack_sendmap *rsm, uint16_t rtrcnt)
7547 if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
7548 (rack->r_ctl.rack_rs.rs_rtt_lowest > rtt)) {
7549 rack->r_ctl.rack_rs.rs_rtt_lowest = rtt;
7551 if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
7552 (rack->r_ctl.rack_rs.rs_rtt_highest < rtt)) {
7553 rack->r_ctl.rack_rs.rs_rtt_highest = rtt;
7555 if (rack->rc_tp->t_flags & TF_GPUTINPROG) {
7556 if (us_rtt < rack->r_ctl.rc_gp_lowrtt)
7557 rack->r_ctl.rc_gp_lowrtt = us_rtt;
7558 if (rack->rc_tp->snd_wnd > rack->r_ctl.rc_gp_high_rwnd)
7559 rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
7561 if ((confidence == 1) &&
7563 (rsm->r_just_ret) ||
7564 (rsm->r_one_out_nr &&
7565 len < (ctf_fixed_maxseg(rack->rc_tp) * 2)))) {
7567 * If the rsm had a just return
7568 * hit it then we can't trust the
7569 * rtt measurement for buffer deterimination
7570 * Note that a confidence of 2, indicates
7571 * SACK'd which overrides the r_just_ret or
7572 * the r_one_out_nr. If it was a CUM-ACK and
7573 * we had only two outstanding, but get an
7574 * ack for only 1. Then that also lowers our
7579 if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY) ||
7580 (rack->r_ctl.rack_rs.rs_us_rtt > us_rtt)) {
7581 if (rack->r_ctl.rack_rs.confidence == 0) {
7583 * We take anything with no current confidence
7586 rack->r_ctl.rack_rs.rs_us_rtt = us_rtt;
7587 rack->r_ctl.rack_rs.confidence = confidence;
7588 rack->r_ctl.rack_rs.rs_us_rtrcnt = rtrcnt;
7589 } else if (confidence || rack->r_ctl.rack_rs.confidence) {
7591 * Once we have a confident number,
7592 * we can update it with a smaller
7593 * value since this confident number
7594 * may include the DSACK time until
7595 * the next segment (the second one) arrived.
7597 rack->r_ctl.rack_rs.rs_us_rtt = us_rtt;
7598 rack->r_ctl.rack_rs.confidence = confidence;
7599 rack->r_ctl.rack_rs.rs_us_rtrcnt = rtrcnt;
7602 rack_log_rtt_upd(rack->rc_tp, rack, us_rtt, len, rsm, confidence);
7603 rack->r_ctl.rack_rs.rs_flags = RACK_RTT_VALID;
7604 rack->r_ctl.rack_rs.rs_rtt_tot += rtt;
7605 rack->r_ctl.rack_rs.rs_rtt_cnt++;
7609 * Collect new round-trip time estimate
7610 * and update averages and current timeout.
7613 tcp_rack_xmit_timer_commit(struct tcp_rack *rack, struct tcpcb *tp)
7618 if (rack->r_ctl.rack_rs.rs_flags & RACK_RTT_EMPTY)
7619 /* No valid sample */
7621 if (rack->r_ctl.rc_rate_sample_method == USE_RTT_LOW) {
7622 /* We are to use the lowest RTT seen in a single ack */
7623 rtt = rack->r_ctl.rack_rs.rs_rtt_lowest;
7624 } else if (rack->r_ctl.rc_rate_sample_method == USE_RTT_HIGH) {
7625 /* We are to use the highest RTT seen in a single ack */
7626 rtt = rack->r_ctl.rack_rs.rs_rtt_highest;
7627 } else if (rack->r_ctl.rc_rate_sample_method == USE_RTT_AVG) {
7628 /* We are to use the average RTT seen in a single ack */
7629 rtt = (int32_t)(rack->r_ctl.rack_rs.rs_rtt_tot /
7630 (uint64_t)rack->r_ctl.rack_rs.rs_rtt_cnt);
7633 panic("Unknown rtt variant %d", rack->r_ctl.rc_rate_sample_method);
7639 if (rack->rc_gp_rtt_set == 0) {
7641 * With no RTT we have to accept
7642 * even one we are not confident of.
7644 rack->r_ctl.rc_gp_srtt = rack->r_ctl.rack_rs.rs_us_rtt;
7645 rack->rc_gp_rtt_set = 1;
7646 } else if (rack->r_ctl.rack_rs.confidence) {
7647 /* update the running gp srtt */
7648 rack->r_ctl.rc_gp_srtt -= (rack->r_ctl.rc_gp_srtt/8);
7649 rack->r_ctl.rc_gp_srtt += rack->r_ctl.rack_rs.rs_us_rtt / 8;
7651 if (rack->r_ctl.rack_rs.confidence) {
7653 * record the low and high for highly buffered path computation,
7654 * we only do this if we are confident (not a retransmission).
7656 if (rack->r_ctl.rc_highest_us_rtt < rack->r_ctl.rack_rs.rs_us_rtt) {
7657 rack->r_ctl.rc_highest_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
7659 if (rack->rc_highly_buffered == 0) {
7661 * Currently once we declare a path has
7662 * highly buffered there is no going
7663 * back, which may be a problem...
7665 if ((rack->r_ctl.rc_highest_us_rtt / rack->r_ctl.rc_lowest_us_rtt) > rack_hbp_thresh) {
7666 rack_log_rtt_shrinks(rack, rack->r_ctl.rack_rs.rs_us_rtt,
7667 rack->r_ctl.rc_highest_us_rtt,
7668 rack->r_ctl.rc_lowest_us_rtt,
7670 rack->rc_highly_buffered = 1;
7674 if ((rack->r_ctl.rack_rs.confidence) ||
7675 (rack->r_ctl.rack_rs.rs_us_rtrcnt == 1)) {
7677 * If we are highly confident of it <or> it was
7678 * never retransmitted we accept it as the last us_rtt.
7680 rack->r_ctl.rc_last_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
7681 /* The lowest rtt can be set if its was not retransmited */
7682 if (rack->r_ctl.rc_lowest_us_rtt > rack->r_ctl.rack_rs.rs_us_rtt) {
7683 rack->r_ctl.rc_lowest_us_rtt = rack->r_ctl.rack_rs.rs_us_rtt;
7684 if (rack->r_ctl.rc_lowest_us_rtt == 0)
7685 rack->r_ctl.rc_lowest_us_rtt = 1;
7688 rack = (struct tcp_rack *)tp->t_fb_ptr;
7689 if (tp->t_srtt != 0) {
7691 * We keep a simple srtt in microseconds, like our rtt
7692 * measurement. We don't need to do any tricks with shifting
7693 * etc. Instead we just add in 1/8th of the new measurement
7694 * and subtract out 1/8 of the old srtt. We do the same with
7695 * the variance after finding the absolute value of the
7696 * difference between this sample and the current srtt.
7698 delta = tp->t_srtt - rtt;
7699 /* Take off 1/8th of the current sRTT */
7700 tp->t_srtt -= (tp->t_srtt >> 3);
7701 /* Add in 1/8th of the new RTT just measured */
7702 tp->t_srtt += (rtt >> 3);
7703 if (tp->t_srtt <= 0)
7705 /* Now lets make the absolute value of the variance */
7708 /* Subtract out 1/8th */
7709 tp->t_rttvar -= (tp->t_rttvar >> 3);
7710 /* Add in 1/8th of the new variance we just saw */
7711 tp->t_rttvar += (delta >> 3);
7712 if (tp->t_rttvar <= 0)
7716 * No rtt measurement yet - use the unsmoothed rtt. Set the
7717 * variance to half the rtt (so our first retransmit happens
7721 tp->t_rttvar = rtt >> 1;
7723 rack->rc_srtt_measure_made = 1;
7724 KMOD_TCPSTAT_INC(tcps_rttupdated);
7727 if (rack_stats_gets_ms_rtt == 0) {
7728 /* Send in the microsecond rtt used for rxt timeout purposes */
7729 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt));
7730 } else if (rack_stats_gets_ms_rtt == 1) {
7731 /* Send in the millisecond rtt used for rxt timeout purposes */
7735 ms_rtt = (rtt + HPTS_USEC_IN_MSEC - 1) / HPTS_USEC_IN_MSEC;
7736 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, ms_rtt));
7737 } else if (rack_stats_gets_ms_rtt == 2) {
7738 /* Send in the millisecond rtt has close to the path RTT as we can get */
7742 ms_rtt = (rack->r_ctl.rack_rs.rs_us_rtt + HPTS_USEC_IN_MSEC - 1) / HPTS_USEC_IN_MSEC;
7743 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, ms_rtt));
7745 /* Send in the microsecond rtt has close to the path RTT as we can get */
7746 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rack->r_ctl.rack_rs.rs_us_rtt));
7751 * the retransmit should happen at rtt + 4 * rttvar. Because of the
7752 * way we do the smoothing, srtt and rttvar will each average +1/2
7753 * tick of bias. When we compute the retransmit timer, we want 1/2
7754 * tick of rounding and 1 extra tick because of +-1/2 tick
7755 * uncertainty in the firing of the timer. The bias will give us
7756 * exactly the 1.5 tick we need. But, because the bias is
7757 * statistical, we have to test that we don't drop below the minimum
7758 * feasible timer (which is 2 ticks).
7761 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
7762 max(rack_rto_min, rtt + 2), rack_rto_max, rack->r_ctl.timer_slop);
7763 rack_log_rtt_sample(rack, rtt);
7764 tp->t_softerror = 0;
7769 rack_apply_updated_usrtt(struct tcp_rack *rack, uint32_t us_rtt, uint32_t us_cts)
7772 * Apply to filter the inbound us-rtt at us_cts.
7776 old_rtt = get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt);
7777 apply_filter_min_small(&rack->r_ctl.rc_gp_min_rtt,
7779 if (old_rtt > us_rtt) {
7780 /* We just hit a new lower rtt time */
7781 rack_log_rtt_shrinks(rack, us_cts, old_rtt,
7782 __LINE__, RACK_RTTS_NEWRTT);
7784 * Only count it if its lower than what we saw within our
7787 if ((old_rtt - us_rtt) > rack_min_rtt_movement) {
7788 if (rack_probertt_lower_within &&
7789 rack->rc_gp_dyn_mul &&
7790 (rack->use_fixed_rate == 0) &&
7791 (rack->rc_always_pace)) {
7793 * We are seeing a new lower rtt very close
7794 * to the time that we would have entered probe-rtt.
7795 * This is probably due to the fact that a peer flow
7796 * has entered probe-rtt. Lets go in now too.
7800 val = rack_probertt_lower_within * rack_time_between_probertt;
7802 if ((rack->in_probe_rtt == 0) &&
7803 ((us_cts - rack->r_ctl.rc_lower_rtt_us_cts) >= (rack_time_between_probertt - val))) {
7804 rack_enter_probertt(rack, us_cts);
7807 rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
7813 rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack,
7814 struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, tcp_seq th_ack)
7818 uint32_t t, len_acked;
7820 if ((rsm->r_flags & RACK_ACKED) ||
7821 (rsm->r_flags & RACK_WAS_ACKED))
7824 if (rsm->r_no_rtt_allowed) {
7828 if (ack_type == CUM_ACKED) {
7829 if (SEQ_GT(th_ack, rsm->r_end)) {
7830 len_acked = rsm->r_end - rsm->r_start;
7833 len_acked = th_ack - rsm->r_start;
7837 len_acked = rsm->r_end - rsm->r_start;
7840 if (rsm->r_rtr_cnt == 1) {
7842 t = cts - (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
7845 if (!tp->t_rttlow || tp->t_rttlow > t)
7847 if (!rack->r_ctl.rc_rack_min_rtt ||
7848 SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
7849 rack->r_ctl.rc_rack_min_rtt = t;
7850 if (rack->r_ctl.rc_rack_min_rtt == 0) {
7851 rack->r_ctl.rc_rack_min_rtt = 1;
7854 if (TSTMP_GT(tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time), rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]))
7855 us_rtt = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time) - (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
7857 us_rtt = tcp_get_usecs(NULL) - (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
7860 if (CC_ALGO(tp)->rttsample != NULL) {
7861 /* Kick the RTT to the CC */
7862 CC_ALGO(tp)->rttsample(&tp->t_ccv, us_rtt, 1, rsm->r_fas);
7864 rack_apply_updated_usrtt(rack, us_rtt, tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time));
7865 if (ack_type == SACKED) {
7866 rack_log_rtt_sample_calc(rack, t, (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)], cts, 1);
7867 tcp_rack_xmit_timer(rack, t + 1, len_acked, us_rtt, 2 , rsm, rsm->r_rtr_cnt);
7870 * We need to setup what our confidence
7873 * If the rsm was app limited and it is
7874 * less than a mss in length (the end
7875 * of the send) then we have a gap. If we
7876 * were app limited but say we were sending
7877 * multiple MSS's then we are more confident
7880 * When we are not app-limited then we see if
7881 * the rsm is being included in the current
7882 * measurement, we tell this by the app_limited_needs_set
7885 * Note that being cwnd blocked is not applimited
7886 * as well as the pacing delay between packets which
7887 * are sending only 1 or 2 MSS's also will show up
7888 * in the RTT. We probably need to examine this algorithm
7889 * a bit more and enhance it to account for the delay
7890 * between rsm's. We could do that by saving off the
7891 * pacing delay of each rsm (in an rsm) and then
7892 * factoring that in somehow though for now I am
7897 if (rsm->r_flags & RACK_APP_LIMITED) {
7898 if (all && (len_acked <= ctf_fixed_maxseg(tp)))
7902 } else if (rack->app_limited_needs_set == 0) {
7907 rack_log_rtt_sample_calc(rack, t, (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)], cts, 2);
7908 tcp_rack_xmit_timer(rack, t + 1, len_acked, us_rtt,
7909 calc_conf, rsm, rsm->r_rtr_cnt);
7911 if ((rsm->r_flags & RACK_TLP) &&
7912 (!IN_FASTRECOVERY(tp->t_flags))) {
7913 /* Segment was a TLP and our retrans matched */
7914 if (rack->r_ctl.rc_tlp_cwnd_reduce) {
7915 rack_cong_signal(tp, CC_NDUPACK, tp->snd_una, __LINE__);
7918 if (SEQ_LT(rack->r_ctl.rc_rack_tmit_time, (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)])) {
7919 /* New more recent rack_tmit_time */
7920 rack->r_ctl.rc_rack_tmit_time = (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
7921 rack->rc_rack_rtt = t;
7926 * We clear the soft/rxtshift since we got an ack.
7927 * There is no assurance we will call the commit() function
7928 * so we need to clear these to avoid incorrect handling.
7931 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
7932 rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
7933 tp->t_softerror = 0;
7934 if (to && (to->to_flags & TOF_TS) &&
7935 (ack_type == CUM_ACKED) &&
7937 ((rsm->r_flags & RACK_OVERMAX) == 0)) {
7939 * Now which timestamp does it match? In this block the ACK
7940 * must be coming from a previous transmission.
7942 for (i = 0; i < rsm->r_rtr_cnt; i++) {
7943 if (rack_ts_to_msec(rsm->r_tim_lastsent[i]) == to->to_tsecr) {
7944 t = cts - (uint32_t)rsm->r_tim_lastsent[i];
7947 if (CC_ALGO(tp)->rttsample != NULL) {
7949 * Kick the RTT to the CC, here
7950 * we lie a bit in that we know the
7951 * retransmission is correct even though
7952 * we retransmitted. This is because
7953 * we match the timestamps.
7955 if (TSTMP_GT(tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time), rsm->r_tim_lastsent[i]))
7956 us_rtt = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time) - (uint32_t)rsm->r_tim_lastsent[i];
7958 us_rtt = tcp_get_usecs(NULL) - (uint32_t)rsm->r_tim_lastsent[i];
7959 CC_ALGO(tp)->rttsample(&tp->t_ccv, us_rtt, 1, rsm->r_fas);
7961 if ((i + 1) < rsm->r_rtr_cnt) {
7963 * The peer ack'd from our previous
7964 * transmission. We have a spurious
7965 * retransmission and thus we dont
7966 * want to update our rack_rtt.
7968 * Hmm should there be a CC revert here?
7973 if (!tp->t_rttlow || tp->t_rttlow > t)
7975 if (!rack->r_ctl.rc_rack_min_rtt || SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
7976 rack->r_ctl.rc_rack_min_rtt = t;
7977 if (rack->r_ctl.rc_rack_min_rtt == 0) {
7978 rack->r_ctl.rc_rack_min_rtt = 1;
7981 if (SEQ_LT(rack->r_ctl.rc_rack_tmit_time,
7982 (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)])) {
7983 /* New more recent rack_tmit_time */
7984 rack->r_ctl.rc_rack_tmit_time = (uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)];
7985 rack->rc_rack_rtt = t;
7987 rack_log_rtt_sample_calc(rack, t, (uint32_t)rsm->r_tim_lastsent[i], cts, 3);
7988 tcp_rack_xmit_timer(rack, t + 1, len_acked, t, 0, rsm,
7996 * Ok its a SACK block that we retransmitted. or a windows
7997 * machine without timestamps. We can tell nothing from the
7998 * time-stamp since its not there or the time the peer last
7999 * recieved a segment that moved forward its cum-ack point.
8002 i = rsm->r_rtr_cnt - 1;
8003 t = cts - (uint32_t)rsm->r_tim_lastsent[i];
8006 if (rack->r_ctl.rc_rack_min_rtt && SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
8008 * We retransmitted and the ack came back in less
8009 * than the smallest rtt we have observed. We most
8010 * likely did an improper retransmit as outlined in
8011 * 6.2 Step 2 point 2 in the rack-draft so we
8012 * don't want to update our rack_rtt. We in
8013 * theory (in future) might want to think about reverting our
8014 * cwnd state but we won't for now.
8017 } else if (rack->r_ctl.rc_rack_min_rtt) {
8019 * We retransmitted it and the retransmit did the
8022 if (!rack->r_ctl.rc_rack_min_rtt ||
8023 SEQ_LT(t, rack->r_ctl.rc_rack_min_rtt)) {
8024 rack->r_ctl.rc_rack_min_rtt = t;
8025 if (rack->r_ctl.rc_rack_min_rtt == 0) {
8026 rack->r_ctl.rc_rack_min_rtt = 1;
8029 if (SEQ_LT(rack->r_ctl.rc_rack_tmit_time, (uint32_t)rsm->r_tim_lastsent[i])) {
8030 /* New more recent rack_tmit_time */
8031 rack->r_ctl.rc_rack_tmit_time = (uint32_t)rsm->r_tim_lastsent[i];
8032 rack->rc_rack_rtt = t;
8041 * Mark the SACK_PASSED flag on all entries prior to rsm send wise.
8044 rack_log_sack_passed(struct tcpcb *tp,
8045 struct tcp_rack *rack, struct rack_sendmap *rsm)
8047 struct rack_sendmap *nrsm;
8050 TAILQ_FOREACH_REVERSE_FROM(nrsm, &rack->r_ctl.rc_tmap,
8051 rack_head, r_tnext) {
8053 /* Skip orginal segment he is acked */
8056 if (nrsm->r_flags & RACK_ACKED) {
8058 * Skip ack'd segments, though we
8059 * should not see these, since tmap
8060 * should not have ack'd segments.
8064 if (nrsm->r_flags & RACK_RWND_COLLAPSED) {
8066 * If the peer dropped the rwnd on
8067 * these then we don't worry about them.
8071 if (nrsm->r_flags & RACK_SACK_PASSED) {
8073 * We found one that is already marked
8074 * passed, we have been here before and
8075 * so all others below this are marked.
8079 nrsm->r_flags |= RACK_SACK_PASSED;
8080 nrsm->r_flags &= ~RACK_WAS_SACKPASS;
8085 rack_need_set_test(struct tcpcb *tp,
8086 struct tcp_rack *rack,
8087 struct rack_sendmap *rsm,
8093 if ((tp->t_flags & TF_GPUTINPROG) &&
8094 SEQ_GEQ(rsm->r_end, tp->gput_seq)) {
8096 * We were app limited, and this ack
8097 * butts up or goes beyond the point where we want
8098 * to start our next measurement. We need
8099 * to record the new gput_ts as here and
8100 * possibly update the start sequence.
8104 if (rsm->r_rtr_cnt > 1) {
8106 * This is a retransmit, can we
8107 * really make any assessment at this
8108 * point? We are not really sure of
8109 * the timestamp, is it this or the
8110 * previous transmission?
8112 * Lets wait for something better that
8113 * is not retransmitted.
8119 rack->app_limited_needs_set = 0;
8120 tp->gput_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
8121 /* Do we start at a new end? */
8122 if ((use_which == RACK_USE_BEG) &&
8123 SEQ_GEQ(rsm->r_start, tp->gput_seq)) {
8125 * When we get an ACK that just eats
8126 * up some of the rsm, we set RACK_USE_BEG
8127 * since whats at r_start (i.e. th_ack)
8128 * is left unacked and thats where the
8129 * measurement not starts.
8131 tp->gput_seq = rsm->r_start;
8132 rack->r_ctl.rc_gp_output_ts = rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
8134 if ((use_which == RACK_USE_END) &&
8135 SEQ_GEQ(rsm->r_end, tp->gput_seq)) {
8137 * We use the end when the cumack
8138 * is moving forward and completely
8139 * deleting the rsm passed so basically
8140 * r_end holds th_ack.
8142 * For SACK's we also want to use the end
8143 * since this piece just got sacked and
8144 * we want to target anything after that
8145 * in our measurement.
8147 tp->gput_seq = rsm->r_end;
8148 rack->r_ctl.rc_gp_output_ts = rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
8150 if (use_which == RACK_USE_END_OR_THACK) {
8152 * special case for ack moving forward,
8153 * not a sack, we need to move all the
8154 * way up to where this ack cum-ack moves
8157 if (SEQ_GT(th_ack, rsm->r_end))
8158 tp->gput_seq = th_ack;
8160 tp->gput_seq = rsm->r_end;
8161 rack->r_ctl.rc_gp_output_ts = rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
8163 if (SEQ_GT(tp->gput_seq, tp->gput_ack)) {
8165 * We moved beyond this guy's range, re-calculate
8166 * the new end point.
8168 if (rack->rc_gp_filled == 0) {
8169 tp->gput_ack = tp->gput_seq + max(rc_init_window(rack), (MIN_GP_WIN * ctf_fixed_maxseg(tp)));
8171 tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
8175 * We are moving the goal post, we may be able to clear the
8176 * measure_saw_probe_rtt flag.
8178 if ((rack->in_probe_rtt == 0) &&
8179 (rack->measure_saw_probe_rtt) &&
8180 (SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
8181 rack->measure_saw_probe_rtt = 0;
8182 rack_log_pacing_delay_calc(rack, ts, tp->gput_ts,
8183 seq, tp->gput_seq, 0, 5, line, NULL, 0);
8184 if (rack->rc_gp_filled &&
8185 ((tp->gput_ack - tp->gput_seq) <
8186 max(rc_init_window(rack), (MIN_GP_WIN *
8187 ctf_fixed_maxseg(tp))))) {
8188 uint32_t ideal_amount;
8190 ideal_amount = rack_get_measure_window(tp, rack);
8191 if (ideal_amount > sbavail(&tptosocket(tp)->so_snd)) {
8193 * There is no sense of continuing this measurement
8194 * because its too small to gain us anything we
8195 * trust. Skip it and that way we can start a new
8196 * measurement quicker.
8198 tp->t_flags &= ~TF_GPUTINPROG;
8199 rack_log_pacing_delay_calc(rack, tp->gput_ack, tp->gput_seq,
8200 0, 0, 0, 6, __LINE__, NULL, 0);
8203 * Reset the window further out.
8205 tp->gput_ack = tp->gput_seq + ideal_amount;
8212 is_rsm_inside_declared_tlp_block(struct tcp_rack *rack, struct rack_sendmap *rsm)
8214 if (SEQ_LT(rsm->r_end, rack->r_ctl.last_tlp_acked_start)) {
8215 /* Behind our TLP definition or right at */
8218 if (SEQ_GT(rsm->r_start, rack->r_ctl.last_tlp_acked_end)) {
8219 /* The start is beyond or right at our end of TLP definition */
8222 /* It has to be a sub-part of the original TLP recorded */
8228 rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack, struct sackblk *sack,
8229 struct tcpopt *to, struct rack_sendmap **prsm, uint32_t cts, int *moved_two)
8231 uint32_t start, end, changed = 0;
8232 struct rack_sendmap stack_map;
8233 struct rack_sendmap *rsm, *nrsm, fe, *prev, *next;
8235 struct rack_sendmap *insret;
8237 int32_t used_ref = 1;
8240 start = sack->start;
8243 memset(&fe, 0, sizeof(fe));
8245 if ((rsm == NULL) ||
8246 (SEQ_LT(end, rsm->r_start)) ||
8247 (SEQ_GEQ(start, rsm->r_end)) ||
8248 (SEQ_LT(start, rsm->r_start))) {
8250 * We are not in the right spot,
8251 * find the correct spot in the tree.
8255 rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
8262 /* Ok we have an ACK for some piece of this rsm */
8263 if (rsm->r_start != start) {
8264 if ((rsm->r_flags & RACK_ACKED) == 0) {
8266 * Before any splitting or hookery is
8267 * done is it a TLP of interest i.e. rxt?
8269 if ((rsm->r_flags & RACK_TLP) &&
8270 (rsm->r_rtr_cnt > 1)) {
8272 * We are splitting a rxt TLP, check
8273 * if we need to save off the start/end
8275 if (rack->rc_last_tlp_acked_set &&
8276 (is_rsm_inside_declared_tlp_block(rack, rsm))) {
8278 * We already turned this on since we are inside
8279 * the previous one was a partially sack now we
8280 * are getting another one (maybe all of it).
8283 rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
8285 * Lets make sure we have all of it though.
8287 if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
8288 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8289 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8290 rack->r_ctl.last_tlp_acked_end);
8292 if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
8293 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8294 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8295 rack->r_ctl.last_tlp_acked_end);
8298 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8299 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8300 rack->rc_last_tlp_past_cumack = 0;
8301 rack->rc_last_tlp_acked_set = 1;
8302 rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
8306 * Need to split this in two pieces the before and after,
8307 * the before remains in the map, the after must be
8308 * added. In other words we have:
8309 * rsm |--------------|
8313 * and nrsm will be the sacked piece
8316 * But before we start down that path lets
8317 * see if the sack spans over on top of
8318 * the next guy and it is already sacked.
8321 next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8322 if (next && (next->r_flags & RACK_ACKED) &&
8323 SEQ_GEQ(end, next->r_start)) {
8325 * So the next one is already acked, and
8326 * we can thus by hookery use our stack_map
8327 * to reflect the piece being sacked and
8328 * then adjust the two tree entries moving
8329 * the start and ends around. So we start like:
8330 * rsm |------------| (not-acked)
8331 * next |-----------| (acked)
8332 * sackblk |-------->
8333 * We want to end like so:
8334 * rsm |------| (not-acked)
8335 * next |-----------------| (acked)
8337 * Where nrsm is a temporary stack piece we
8338 * use to update all the gizmos.
8340 /* Copy up our fudge block */
8342 memcpy(nrsm, rsm, sizeof(struct rack_sendmap));
8343 /* Now adjust our tree blocks */
8345 next->r_start = start;
8346 /* Now we must adjust back where next->m is */
8347 rack_setup_offset_for_rsm(rsm, next);
8349 /* We don't need to adjust rsm, it did not change */
8350 /* Clear out the dup ack count of the remainder */
8352 rsm->r_just_ret = 0;
8353 rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
8354 /* Now lets make sure our fudge block is right */
8355 nrsm->r_start = start;
8356 /* Now lets update all the stats and such */
8357 rack_update_rtt(tp, rack, nrsm, to, cts, SACKED, 0);
8358 if (rack->app_limited_needs_set)
8359 rack_need_set_test(tp, rack, nrsm, tp->snd_una, __LINE__, RACK_USE_END);
8360 changed += (nrsm->r_end - nrsm->r_start);
8361 rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start);
8362 if (nrsm->r_flags & RACK_SACK_PASSED) {
8363 rack->r_ctl.rc_reorder_ts = cts;
8366 * Now we want to go up from rsm (the
8367 * one left un-acked) to the next one
8368 * in the tmap. We do this so when
8369 * we walk backwards we include marking
8370 * sack-passed on rsm (The one passed in
8371 * is skipped since it is generally called
8372 * on something sacked before removing it
8375 if (rsm->r_in_tmap) {
8376 nrsm = TAILQ_NEXT(rsm, r_tnext);
8378 * Now that we have the next
8379 * one walk backwards from there.
8381 if (nrsm && nrsm->r_in_tmap)
8382 rack_log_sack_passed(tp, rack, nrsm);
8384 /* Now are we done? */
8385 if (SEQ_LT(end, next->r_end) ||
8386 (end == next->r_end)) {
8387 /* Done with block */
8390 rack_log_map_chg(tp, rack, &stack_map, rsm, next, MAP_SACK_M1, end, __LINE__);
8391 counter_u64_add(rack_sack_used_next_merge, 1);
8392 /* Postion for the next block */
8393 start = next->r_end;
8394 rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, next);
8399 * We can't use any hookery here, so we
8400 * need to split the map. We enter like
8404 * We will add the new block nrsm and
8405 * that will be the new portion, and then
8406 * fall through after reseting rsm. So we
8407 * split and look like this:
8411 * We then fall through reseting
8412 * rsm to nrsm, so the next block
8415 nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
8418 * failed XXXrrs what can we do but loose the sack
8423 counter_u64_add(rack_sack_splits, 1);
8424 rack_clone_rsm(rack, nrsm, rsm, start);
8425 rsm->r_just_ret = 0;
8427 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
8429 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
8430 if (insret != NULL) {
8431 panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
8432 nrsm, insret, rack, rsm);
8435 if (rsm->r_in_tmap) {
8436 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
8437 nrsm->r_in_tmap = 1;
8439 rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SACK_M2, end, __LINE__);
8440 rsm->r_flags &= (~RACK_HAS_FIN);
8441 /* Position us to point to the new nrsm that starts the sack blk */
8445 /* Already sacked this piece */
8446 counter_u64_add(rack_sack_skipped_acked, 1);
8448 if (end == rsm->r_end) {
8449 /* Done with block */
8450 rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8452 } else if (SEQ_LT(end, rsm->r_end)) {
8453 /* A partial sack to a already sacked block */
8455 rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8459 * The end goes beyond this guy
8460 * reposition the start to the
8464 rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8470 if (SEQ_GEQ(end, rsm->r_end)) {
8472 * The end of this block is either beyond this guy or right
8473 * at this guy. I.e.:
8479 if ((rsm->r_flags & RACK_ACKED) == 0) {
8481 * Is it a TLP of interest?
8483 if ((rsm->r_flags & RACK_TLP) &&
8484 (rsm->r_rtr_cnt > 1)) {
8486 * We are splitting a rxt TLP, check
8487 * if we need to save off the start/end
8489 if (rack->rc_last_tlp_acked_set &&
8490 (is_rsm_inside_declared_tlp_block(rack, rsm))) {
8492 * We already turned this on since we are inside
8493 * the previous one was a partially sack now we
8494 * are getting another one (maybe all of it).
8496 rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
8498 * Lets make sure we have all of it though.
8500 if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
8501 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8502 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8503 rack->r_ctl.last_tlp_acked_end);
8505 if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
8506 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8507 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8508 rack->r_ctl.last_tlp_acked_end);
8511 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8512 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8513 rack->rc_last_tlp_past_cumack = 0;
8514 rack->rc_last_tlp_acked_set = 1;
8515 rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
8518 rack_update_rtt(tp, rack, rsm, to, cts, SACKED, 0);
8519 changed += (rsm->r_end - rsm->r_start);
8520 rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
8521 if (rsm->r_in_tmap) /* should be true */
8522 rack_log_sack_passed(tp, rack, rsm);
8523 /* Is Reordering occuring? */
8524 if (rsm->r_flags & RACK_SACK_PASSED) {
8525 rsm->r_flags &= ~RACK_SACK_PASSED;
8526 rack->r_ctl.rc_reorder_ts = cts;
8528 if (rack->app_limited_needs_set)
8529 rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_END);
8530 rsm->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
8531 rsm->r_flags |= RACK_ACKED;
8532 if (rsm->r_in_tmap) {
8533 TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
8536 rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_SACK_M3, end, __LINE__);
8538 counter_u64_add(rack_sack_skipped_acked, 1);
8541 if (end == rsm->r_end) {
8542 /* This block only - done, setup for next */
8546 * There is more not coverend by this rsm move on
8547 * to the next block in the RB tree.
8549 nrsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8557 * The end of this sack block is smaller than
8562 if ((rsm->r_flags & RACK_ACKED) == 0) {
8564 * Is it a TLP of interest?
8566 if ((rsm->r_flags & RACK_TLP) &&
8567 (rsm->r_rtr_cnt > 1)) {
8569 * We are splitting a rxt TLP, check
8570 * if we need to save off the start/end
8572 if (rack->rc_last_tlp_acked_set &&
8573 (is_rsm_inside_declared_tlp_block(rack, rsm))) {
8575 * We already turned this on since we are inside
8576 * the previous one was a partially sack now we
8577 * are getting another one (maybe all of it).
8579 rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
8581 * Lets make sure we have all of it though.
8583 if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
8584 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8585 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8586 rack->r_ctl.last_tlp_acked_end);
8588 if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
8589 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8590 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8591 rack->r_ctl.last_tlp_acked_end);
8594 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8595 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8596 rack->rc_last_tlp_past_cumack = 0;
8597 rack->rc_last_tlp_acked_set = 1;
8598 rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
8601 prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8603 (prev->r_flags & RACK_ACKED)) {
8605 * Goal, we want the right remainder of rsm to shrink
8606 * in place and span from (rsm->r_start = end) to rsm->r_end.
8607 * We want to expand prev to go all the way
8608 * to prev->r_end <- end.
8609 * so in the tree we have before:
8610 * prev |--------| (acked)
8611 * rsm |-------| (non-acked)
8613 * We churn it so we end up with
8614 * prev |----------| (acked)
8615 * rsm |-----| (non-acked)
8616 * nrsm |-| (temporary)
8618 * Note if either prev/rsm is a TLP we don't
8622 memcpy(nrsm, rsm, sizeof(struct rack_sendmap));
8625 /* Now adjust nrsm (stack copy) to be
8626 * the one that is the small
8627 * piece that was "sacked".
8631 rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
8633 * Now that the rsm has had its start moved forward
8634 * lets go ahead and get its new place in the world.
8636 rack_setup_offset_for_rsm(prev, rsm);
8638 * Now nrsm is our new little piece
8639 * that is acked (which was merged
8640 * to prev). Update the rtt and changed
8641 * based on that. Also check for reordering.
8643 rack_update_rtt(tp, rack, nrsm, to, cts, SACKED, 0);
8644 if (rack->app_limited_needs_set)
8645 rack_need_set_test(tp, rack, nrsm, tp->snd_una, __LINE__, RACK_USE_END);
8646 changed += (nrsm->r_end - nrsm->r_start);
8647 rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start);
8648 if (nrsm->r_flags & RACK_SACK_PASSED) {
8649 rack->r_ctl.rc_reorder_ts = cts;
8651 rack_log_map_chg(tp, rack, prev, &stack_map, rsm, MAP_SACK_M4, end, __LINE__);
8653 counter_u64_add(rack_sack_used_prev_merge, 1);
8656 * This is the case where our previous
8657 * block is not acked either, so we must
8658 * split the block in two.
8660 nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
8662 /* failed rrs what can we do but loose the sack info? */
8665 if ((rsm->r_flags & RACK_TLP) &&
8666 (rsm->r_rtr_cnt > 1)) {
8668 * We are splitting a rxt TLP, check
8669 * if we need to save off the start/end
8671 if (rack->rc_last_tlp_acked_set &&
8672 (is_rsm_inside_declared_tlp_block(rack, rsm))) {
8674 * We already turned this on since this block is inside
8675 * the previous one was a partially sack now we
8676 * are getting another one (maybe all of it).
8678 rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
8680 * Lets make sure we have all of it though.
8682 if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
8683 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8684 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8685 rack->r_ctl.last_tlp_acked_end);
8687 if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
8688 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8689 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
8690 rack->r_ctl.last_tlp_acked_end);
8693 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
8694 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
8695 rack->rc_last_tlp_acked_set = 1;
8696 rack->rc_last_tlp_past_cumack = 0;
8697 rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
8701 * In this case nrsm becomes
8702 * nrsm->r_start = end;
8703 * nrsm->r_end = rsm->r_end;
8704 * which is un-acked.
8706 * rsm->r_end = nrsm->r_start;
8707 * i.e. the remaining un-acked
8708 * piece is left on the left
8711 * So we start like this
8712 * rsm |----------| (not acked)
8714 * build it so we have
8716 * nrsm |------| (not acked)
8718 counter_u64_add(rack_sack_splits, 1);
8719 rack_clone_rsm(rack, nrsm, rsm, end);
8720 rsm->r_flags &= (~RACK_HAS_FIN);
8721 rsm->r_just_ret = 0;
8723 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
8725 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
8726 if (insret != NULL) {
8727 panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
8728 nrsm, insret, rack, rsm);
8731 if (rsm->r_in_tmap) {
8732 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
8733 nrsm->r_in_tmap = 1;
8736 rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2);
8737 rack_update_rtt(tp, rack, rsm, to, cts, SACKED, 0);
8738 changed += (rsm->r_end - rsm->r_start);
8739 rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start);
8740 if (rsm->r_in_tmap) /* should be true */
8741 rack_log_sack_passed(tp, rack, rsm);
8742 /* Is Reordering occuring? */
8743 if (rsm->r_flags & RACK_SACK_PASSED) {
8744 rsm->r_flags &= ~RACK_SACK_PASSED;
8745 rack->r_ctl.rc_reorder_ts = cts;
8747 if (rack->app_limited_needs_set)
8748 rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_END);
8749 rsm->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
8750 rsm->r_flags |= RACK_ACKED;
8751 rack_log_map_chg(tp, rack, NULL, rsm, nrsm, MAP_SACK_M5, end, __LINE__);
8752 if (rsm->r_in_tmap) {
8753 TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
8757 } else if (start != end){
8759 * The block was already acked.
8761 counter_u64_add(rack_sack_skipped_acked, 1);
8766 ((rsm->r_flags & RACK_TLP) == 0) &&
8767 (rsm->r_flags & RACK_ACKED)) {
8769 * Now can we merge where we worked
8770 * with either the previous or
8773 next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8775 if (next->r_flags & RACK_TLP)
8777 if (next->r_flags & RACK_ACKED) {
8778 /* yep this and next can be merged */
8779 rsm = rack_merge_rsm(rack, rsm, next);
8780 next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8784 /* Now what about the previous? */
8785 prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8787 if (prev->r_flags & RACK_TLP)
8789 if (prev->r_flags & RACK_ACKED) {
8790 /* yep the previous and this can be merged */
8791 rsm = rack_merge_rsm(rack, prev, rsm);
8792 prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8797 if (used_ref == 0) {
8798 counter_u64_add(rack_sack_proc_all, 1);
8800 counter_u64_add(rack_sack_proc_short, 1);
8802 /* Save off the next one for quick reference. */
8804 nrsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8807 *prsm = rack->r_ctl.rc_sacklast = nrsm;
8808 /* Pass back the moved. */
8814 rack_peer_reneges(struct tcp_rack *rack, struct rack_sendmap *rsm, tcp_seq th_ack)
8816 struct rack_sendmap *tmap;
8819 while (rsm && (rsm->r_flags & RACK_ACKED)) {
8820 /* Its no longer sacked, mark it so */
8821 rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
8823 if (rsm->r_in_tmap) {
8824 panic("rack:%p rsm:%p flags:0x%x in tmap?",
8825 rack, rsm, rsm->r_flags);
8828 rsm->r_flags &= ~(RACK_ACKED|RACK_SACK_PASSED|RACK_WAS_SACKPASS);
8829 /* Rebuild it into our tmap */
8831 TAILQ_INSERT_HEAD(&rack->r_ctl.rc_tmap, rsm, r_tnext);
8834 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, tmap, rsm, r_tnext);
8837 tmap->r_in_tmap = 1;
8838 rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
8841 * Now lets possibly clear the sack filter so we start
8842 * recognizing sacks that cover this area.
8844 sack_filter_clear(&rack->r_ctl.rack_sf, th_ack);
8849 rack_do_decay(struct tcp_rack *rack)
8853 #define timersub(tvp, uvp, vvp) \
8855 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
8856 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
8857 if ((vvp)->tv_usec < 0) { \
8859 (vvp)->tv_usec += 1000000; \
8863 timersub(&rack->r_ctl.act_rcv_time, &rack->r_ctl.rc_last_time_decay, &res);
8866 rack->r_ctl.input_pkt++;
8867 if ((rack->rc_in_persist) ||
8868 (res.tv_sec >= 1) ||
8869 (rack->rc_tp->snd_max == rack->rc_tp->snd_una)) {
8871 * Check for decay of non-SAD,
8872 * we want all SAD detection metrics to
8873 * decay 1/4 per second (or more) passed.
8875 #ifdef NETFLIX_EXP_DETECTION
8878 pkt_delta = rack->r_ctl.input_pkt - rack->r_ctl.saved_input_pkt;
8880 /* Update our saved tracking values */
8881 rack->r_ctl.saved_input_pkt = rack->r_ctl.input_pkt;
8882 rack->r_ctl.rc_last_time_decay = rack->r_ctl.act_rcv_time;
8883 /* Now do we escape without decay? */
8884 #ifdef NETFLIX_EXP_DETECTION
8885 if (rack->rc_in_persist ||
8886 (rack->rc_tp->snd_max == rack->rc_tp->snd_una) ||
8887 (pkt_delta < tcp_sad_low_pps)){
8889 * We don't decay idle connections
8890 * or ones that have a low input pps.
8894 /* Decay the counters */
8895 rack->r_ctl.ack_count = ctf_decay_count(rack->r_ctl.ack_count,
8897 rack->r_ctl.sack_count = ctf_decay_count(rack->r_ctl.sack_count,
8899 rack->r_ctl.sack_moved_extra = ctf_decay_count(rack->r_ctl.sack_moved_extra,
8901 rack->r_ctl.sack_noextra_move = ctf_decay_count(rack->r_ctl.sack_noextra_move,
8908 rack_process_to_cumack(struct tcpcb *tp, struct tcp_rack *rack, register uint32_t th_ack, uint32_t cts, struct tcpopt *to)
8910 struct rack_sendmap *rsm;
8912 struct rack_sendmap *rm;
8916 * The ACK point is advancing to th_ack, we must drop off
8917 * the packets in the rack log and calculate any eligble
8920 rack->r_wanted_output = 1;
8922 /* Tend any TLP that has been marked for 1/2 the seq space (its old) */
8923 if ((rack->rc_last_tlp_acked_set == 1)&&
8924 (rack->rc_last_tlp_past_cumack == 1) &&
8925 (SEQ_GT(rack->r_ctl.last_tlp_acked_start, th_ack))) {
8927 * We have reached the point where our last rack
8928 * tlp retransmit sequence is ahead of the cum-ack.
8929 * This can only happen when the cum-ack moves all
8930 * the way around (its been a full 2^^31+1 bytes
8931 * or more since we sent a retransmitted TLP). Lets
8932 * turn off the valid flag since its not really valid.
8934 * Note since sack's also turn on this event we have
8935 * a complication, we have to wait to age it out until
8936 * the cum-ack is by the TLP before checking which is
8937 * what the next else clause does.
8939 rack_log_dsack_event(rack, 9, __LINE__,
8940 rack->r_ctl.last_tlp_acked_start,
8941 rack->r_ctl.last_tlp_acked_end);
8942 rack->rc_last_tlp_acked_set = 0;
8943 rack->rc_last_tlp_past_cumack = 0;
8944 } else if ((rack->rc_last_tlp_acked_set == 1) &&
8945 (rack->rc_last_tlp_past_cumack == 0) &&
8946 (SEQ_GEQ(th_ack, rack->r_ctl.last_tlp_acked_end))) {
8948 * It is safe to start aging TLP's out.
8950 rack->rc_last_tlp_past_cumack = 1;
8952 /* We do the same for the tlp send seq as well */
8953 if ((rack->rc_last_sent_tlp_seq_valid == 1) &&
8954 (rack->rc_last_sent_tlp_past_cumack == 1) &&
8955 (SEQ_GT(rack->r_ctl.last_sent_tlp_seq, th_ack))) {
8956 rack_log_dsack_event(rack, 9, __LINE__,
8957 rack->r_ctl.last_sent_tlp_seq,
8958 (rack->r_ctl.last_sent_tlp_seq +
8959 rack->r_ctl.last_sent_tlp_len));
8960 rack->rc_last_sent_tlp_seq_valid = 0;
8961 rack->rc_last_sent_tlp_past_cumack = 0;
8962 } else if ((rack->rc_last_sent_tlp_seq_valid == 1) &&
8963 (rack->rc_last_sent_tlp_past_cumack == 0) &&
8964 (SEQ_GEQ(th_ack, rack->r_ctl.last_sent_tlp_seq))) {
8966 * It is safe to start aging TLP's send.
8968 rack->rc_last_sent_tlp_past_cumack = 1;
8971 rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
8973 if ((th_ack - 1) == tp->iss) {
8975 * For the SYN incoming case we will not
8976 * have called tcp_output for the sending of
8977 * the SYN, so there will be no map. All
8978 * other cases should probably be a panic.
8982 if (tp->t_flags & TF_SENTFIN) {
8983 /* if we sent a FIN we often will not have map */
8987 panic("No rack map tp:%p for state:%d ack:%u rack:%p snd_una:%u snd_max:%u snd_nxt:%u\n",
8989 tp->t_state, th_ack, rack,
8990 tp->snd_una, tp->snd_max, tp->snd_nxt);
8994 if (SEQ_LT(th_ack, rsm->r_start)) {
8995 /* Huh map is missing this */
8997 printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d\n",
8999 th_ack, tp->t_state, rack->r_state);
9003 rack_update_rtt(tp, rack, rsm, to, cts, CUM_ACKED, th_ack);
9005 /* Now was it a retransmitted TLP? */
9006 if ((rsm->r_flags & RACK_TLP) &&
9007 (rsm->r_rtr_cnt > 1)) {
9009 * Yes, this rsm was a TLP and retransmitted, remember that
9010 * since if a DSACK comes back on this we don't want
9011 * to think of it as a reordered segment. This may
9012 * get updated again with possibly even other TLPs
9013 * in flight, but thats ok. Only when we don't send
9014 * a retransmitted TLP for 1/2 the sequences space
9015 * will it get turned off (above).
9017 if (rack->rc_last_tlp_acked_set &&
9018 (is_rsm_inside_declared_tlp_block(rack, rsm))) {
9020 * We already turned this on since the end matches,
9021 * the previous one was a partially ack now we
9022 * are getting another one (maybe all of it).
9024 rack_log_dsack_event(rack, 10, __LINE__, rsm->r_start, rsm->r_end);
9026 * Lets make sure we have all of it though.
9028 if (SEQ_LT(rsm->r_start, rack->r_ctl.last_tlp_acked_start)) {
9029 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
9030 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
9031 rack->r_ctl.last_tlp_acked_end);
9033 if (SEQ_GT(rsm->r_end, rack->r_ctl.last_tlp_acked_end)) {
9034 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
9035 rack_log_dsack_event(rack, 11, __LINE__, rack->r_ctl.last_tlp_acked_start,
9036 rack->r_ctl.last_tlp_acked_end);
9039 rack->rc_last_tlp_past_cumack = 1;
9040 rack->r_ctl.last_tlp_acked_start = rsm->r_start;
9041 rack->r_ctl.last_tlp_acked_end = rsm->r_end;
9042 rack->rc_last_tlp_acked_set = 1;
9043 rack_log_dsack_event(rack, 8, __LINE__, rsm->r_start, rsm->r_end);
9046 /* Now do we consume the whole thing? */
9047 if (SEQ_GEQ(th_ack, rsm->r_end)) {
9048 /* Its all consumed. */
9050 uint8_t newly_acked;
9052 rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_FREE, rsm->r_end, __LINE__);
9053 rack->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes;
9054 rsm->r_rtr_bytes = 0;
9055 /* Record the time of highest cumack sent */
9056 rack->r_ctl.rc_gp_cumack_ts = rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
9058 (void)RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
9060 rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
9062 panic("removing head in rack:%p rsm:%p rm:%p",
9066 if (rsm->r_in_tmap) {
9067 TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext);
9071 if (rsm->r_flags & RACK_ACKED) {
9073 * It was acked on the scoreboard -- remove
9076 rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start);
9078 } else if (rsm->r_flags & RACK_SACK_PASSED) {
9080 * There are segments ACKED on the
9081 * scoreboard further up. We are seeing
9084 rsm->r_flags &= ~RACK_SACK_PASSED;
9085 rsm->r_ack_arrival = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
9086 rsm->r_flags |= RACK_ACKED;
9087 rack->r_ctl.rc_reorder_ts = cts;
9088 if (rack->r_ent_rec_ns) {
9090 * We have sent no more, and we saw an sack
9093 rack->r_might_revert = 1;
9096 if ((rsm->r_flags & RACK_TO_REXT) &&
9097 (tp->t_flags & TF_RCVD_TSTMP) &&
9098 (to->to_flags & TOF_TS) &&
9099 (to->to_tsecr != 0) &&
9100 (tp->t_flags & TF_PREVVALID)) {
9102 * We can use the timestamp to see
9103 * if this retransmission was from the
9104 * first transmit. If so we made a mistake.
9106 tp->t_flags &= ~TF_PREVVALID;
9107 if (to->to_tsecr == rack_ts_to_msec(rsm->r_tim_lastsent[0])) {
9108 /* The first transmit is what this ack is for */
9109 rack_cong_signal(tp, CC_RTO_ERR, th_ack, __LINE__);
9112 left = th_ack - rsm->r_end;
9113 if (rack->app_limited_needs_set && newly_acked)
9114 rack_need_set_test(tp, rack, rsm, th_ack, __LINE__, RACK_USE_END_OR_THACK);
9115 /* Free back to zone */
9116 rack_free(rack, rsm);
9120 /* Check for reneging */
9121 rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
9122 if (rsm && (rsm->r_flags & RACK_ACKED) && (th_ack == rsm->r_start)) {
9124 * The peer has moved snd_una up to
9125 * the edge of this send, i.e. one
9126 * that it had previously acked. The only
9127 * way that can be true if the peer threw
9128 * away data (space issues) that it had
9129 * previously sacked (else it would have
9130 * given us snd_una up to (rsm->r_end).
9131 * We need to undo the acked markings here.
9133 * Note we have to look to make sure th_ack is
9134 * our rsm->r_start in case we get an old ack
9135 * where th_ack is behind snd_una.
9137 rack_peer_reneges(rack, rsm, th_ack);
9141 if (rsm->r_flags & RACK_ACKED) {
9143 * It was acked on the scoreboard -- remove it from
9144 * total for the part being cum-acked.
9146 rack->r_ctl.rc_sacked -= (th_ack - rsm->r_start);
9149 * Clear the dup ack count for
9150 * the piece that remains.
9153 rack_log_retran_reason(rack, rsm, __LINE__, 0, 2);
9154 if (rsm->r_rtr_bytes) {
9156 * It was retransmitted adjust the
9157 * sack holes for what was acked.
9161 ack_am = (th_ack - rsm->r_start);
9162 if (ack_am >= rsm->r_rtr_bytes) {
9163 rack->r_ctl.rc_holes_rxt -= ack_am;
9164 rsm->r_rtr_bytes -= ack_am;
9168 * Update where the piece starts and record
9169 * the time of send of highest cumack sent.
9171 rack->r_ctl.rc_gp_cumack_ts = rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)];
9172 rack_log_map_chg(tp, rack, NULL, rsm, NULL, MAP_TRIM_HEAD, th_ack, __LINE__);
9173 /* Now we need to move our offset forward too */
9174 if (rsm->m && (rsm->orig_m_len != rsm->m->m_len)) {
9175 /* Fix up the orig_m_len and possibly the mbuf offset */
9176 rack_adjust_orig_mlen(rsm);
9178 rsm->soff += (th_ack - rsm->r_start);
9179 rsm->r_start = th_ack;
9180 /* Now do we need to move the mbuf fwd too? */
9182 while (rsm->soff >= rsm->m->m_len) {
9183 rsm->soff -= rsm->m->m_len;
9184 rsm->m = rsm->m->m_next;
9185 KASSERT((rsm->m != NULL),
9186 (" nrsm:%p hit at soff:%u null m",
9189 rsm->orig_m_len = rsm->m->m_len;
9191 if (rack->app_limited_needs_set)
9192 rack_need_set_test(tp, rack, rsm, tp->snd_una, __LINE__, RACK_USE_BEG);
9196 rack_handle_might_revert(struct tcpcb *tp, struct tcp_rack *rack)
9198 struct rack_sendmap *rsm;
9199 int sack_pass_fnd = 0;
9201 if (rack->r_might_revert) {
9203 * Ok we have reordering, have not sent anything, we
9204 * might want to revert the congestion state if nothing
9205 * further has SACK_PASSED on it. Lets check.
9207 * We also get here when we have DSACKs come in for
9208 * all the data that we FR'd. Note that a rxt or tlp
9209 * timer clears this from happening.
9212 TAILQ_FOREACH(rsm, &rack->r_ctl.rc_tmap, r_tnext) {
9213 if (rsm->r_flags & RACK_SACK_PASSED) {
9218 if (sack_pass_fnd == 0) {
9220 * We went into recovery
9221 * incorrectly due to reordering!
9225 rack->r_ent_rec_ns = 0;
9226 orig_cwnd = tp->snd_cwnd;
9227 tp->snd_ssthresh = rack->r_ctl.rc_ssthresh_at_erec;
9228 tp->snd_recover = tp->snd_una;
9229 rack_log_to_prr(rack, 14, orig_cwnd, __LINE__);
9230 EXIT_RECOVERY(tp->t_flags);
9232 rack->r_might_revert = 0;
9236 #ifdef NETFLIX_EXP_DETECTION
9238 rack_do_detection(struct tcpcb *tp, struct tcp_rack *rack, uint32_t bytes_this_ack, uint32_t segsiz)
9240 if ((rack->do_detection || tcp_force_detection) &&
9241 tcp_sack_to_ack_thresh &&
9242 tcp_sack_to_move_thresh &&
9243 ((rack->r_ctl.rc_num_maps_alloced > tcp_map_minimum) || rack->sack_attack_disable)) {
9245 * We have thresholds set to find
9246 * possible attackers and disable sack.
9249 uint64_t ackratio, moveratio, movetotal;
9252 rack_log_sad(rack, 1);
9253 ackratio = (uint64_t)(rack->r_ctl.sack_count);
9254 ackratio *= (uint64_t)(1000);
9255 if (rack->r_ctl.ack_count)
9256 ackratio /= (uint64_t)(rack->r_ctl.ack_count);
9258 /* We really should not hit here */
9261 if ((rack->sack_attack_disable == 0) &&
9262 (ackratio > rack_highest_sack_thresh_seen))
9263 rack_highest_sack_thresh_seen = (uint32_t)ackratio;
9264 movetotal = rack->r_ctl.sack_moved_extra;
9265 movetotal += rack->r_ctl.sack_noextra_move;
9266 moveratio = rack->r_ctl.sack_moved_extra;
9267 moveratio *= (uint64_t)1000;
9269 moveratio /= movetotal;
9271 /* No moves, thats pretty good */
9274 if ((rack->sack_attack_disable == 0) &&
9275 (moveratio > rack_highest_move_thresh_seen))
9276 rack_highest_move_thresh_seen = (uint32_t)moveratio;
9277 if (rack->sack_attack_disable == 0) {
9278 if ((ackratio > tcp_sack_to_ack_thresh) &&
9279 (moveratio > tcp_sack_to_move_thresh)) {
9280 /* Disable sack processing */
9281 rack->sack_attack_disable = 1;
9282 if (rack->r_rep_attack == 0) {
9283 rack->r_rep_attack = 1;
9284 counter_u64_add(rack_sack_attacks_detected, 1);
9286 if (tcp_attack_on_turns_on_logging) {
9288 * Turn on logging, used for debugging
9291 rack->rc_tp->t_logstate = tcp_attack_on_turns_on_logging;
9293 /* Clamp the cwnd at flight size */
9294 rack->r_ctl.rc_saved_cwnd = rack->rc_tp->snd_cwnd;
9295 rack->rc_tp->snd_cwnd = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
9296 rack_log_sad(rack, 2);
9299 /* We are sack-disabled check for false positives */
9300 if ((ackratio <= tcp_restoral_thresh) ||
9301 (rack->r_ctl.rc_num_maps_alloced < tcp_map_minimum)) {
9302 rack->sack_attack_disable = 0;
9303 rack_log_sad(rack, 3);
9304 /* Restart counting */
9305 rack->r_ctl.sack_count = 0;
9306 rack->r_ctl.sack_moved_extra = 0;
9307 rack->r_ctl.sack_noextra_move = 1;
9308 rack->r_ctl.ack_count = max(1,
9309 (bytes_this_ack / segsiz));
9311 if (rack->r_rep_reverse == 0) {
9312 rack->r_rep_reverse = 1;
9313 counter_u64_add(rack_sack_attacks_reversed, 1);
9315 /* Restore the cwnd */
9316 if (rack->r_ctl.rc_saved_cwnd > rack->rc_tp->snd_cwnd)
9317 rack->rc_tp->snd_cwnd = rack->r_ctl.rc_saved_cwnd;
9325 rack_note_dsack(struct tcp_rack *rack, tcp_seq start, tcp_seq end)
9331 if (SEQ_GT(end, start))
9335 if ((rack->rc_last_tlp_acked_set ) &&
9336 (SEQ_GEQ(start, rack->r_ctl.last_tlp_acked_start)) &&
9337 (SEQ_LEQ(end, rack->r_ctl.last_tlp_acked_end))) {
9339 * The DSACK is because of a TLP which we don't
9340 * do anything with the reordering window over since
9341 * it was not reordering that caused the DSACK but
9342 * our previous retransmit TLP.
9344 rack_log_dsack_event(rack, 7, __LINE__, start, end);
9346 goto skip_dsack_round;
9348 if (rack->rc_last_sent_tlp_seq_valid) {
9349 l_end = rack->r_ctl.last_sent_tlp_seq + rack->r_ctl.last_sent_tlp_len;
9350 if (SEQ_GEQ(start, rack->r_ctl.last_sent_tlp_seq) &&
9351 (SEQ_LEQ(end, l_end))) {
9353 * This dsack is from the last sent TLP, ignore it
9354 * for reordering purposes.
9356 rack_log_dsack_event(rack, 7, __LINE__, start, end);
9358 goto skip_dsack_round;
9361 if (rack->rc_dsack_round_seen == 0) {
9362 rack->rc_dsack_round_seen = 1;
9363 rack->r_ctl.dsack_round_end = rack->rc_tp->snd_max;
9364 rack->r_ctl.num_dsack++;
9365 rack->r_ctl.dsack_persist = 16; /* 16 is from the standard */
9366 rack_log_dsack_event(rack, 2, __LINE__, 0, 0);
9370 * We keep track of how many DSACK blocks we get
9371 * after a recovery incident.
9373 rack->r_ctl.dsack_byte_cnt += am;
9374 if (!IN_FASTRECOVERY(rack->rc_tp->t_flags) &&
9375 rack->r_ctl.retran_during_recovery &&
9376 (rack->r_ctl.dsack_byte_cnt >= rack->r_ctl.retran_during_recovery)) {
9378 * False recovery most likely culprit is reordering. If
9379 * nothing else is missing we need to revert.
9381 rack->r_might_revert = 1;
9382 rack_handle_might_revert(rack->rc_tp, rack);
9383 rack->r_might_revert = 0;
9384 rack->r_ctl.retran_during_recovery = 0;
9385 rack->r_ctl.dsack_byte_cnt = 0;
9391 do_rack_compute_pipe(struct tcpcb *tp, struct tcp_rack *rack, uint32_t snd_una)
9393 return (((tp->snd_max - snd_una) - rack->r_ctl.rc_sacked) + rack->r_ctl.rc_holes_rxt);
9397 rack_compute_pipe(struct tcpcb *tp)
9399 return ((int32_t)do_rack_compute_pipe(tp,
9400 (struct tcp_rack *)tp->t_fb_ptr,
9405 rack_update_prr(struct tcpcb *tp, struct tcp_rack *rack, uint32_t changed, tcp_seq th_ack)
9407 /* Deal with changed and PRR here (in recovery only) */
9408 uint32_t pipe, snd_una;
9410 rack->r_ctl.rc_prr_delivered += changed;
9412 if (sbavail(&rack->rc_inp->inp_socket->so_snd) <= (tp->snd_max - tp->snd_una)) {
9414 * It is all outstanding, we are application limited
9415 * and thus we don't need more room to send anything.
9416 * Note we use tp->snd_una here and not th_ack because
9417 * the data as yet not been cut from the sb.
9419 rack->r_ctl.rc_prr_sndcnt = 0;
9422 /* Compute prr_sndcnt */
9423 if (SEQ_GT(tp->snd_una, th_ack)) {
9424 snd_una = tp->snd_una;
9428 pipe = do_rack_compute_pipe(tp, rack, snd_una);
9429 if (pipe > tp->snd_ssthresh) {
9432 sndcnt = rack->r_ctl.rc_prr_delivered * tp->snd_ssthresh;
9433 if (rack->r_ctl.rc_prr_recovery_fs > 0)
9434 sndcnt /= (long)rack->r_ctl.rc_prr_recovery_fs;
9436 rack->r_ctl.rc_prr_sndcnt = 0;
9437 rack_log_to_prr(rack, 9, 0, __LINE__);
9441 if (sndcnt > (long)rack->r_ctl.rc_prr_out)
9442 sndcnt -= rack->r_ctl.rc_prr_out;
9445 rack->r_ctl.rc_prr_sndcnt = sndcnt;
9446 rack_log_to_prr(rack, 10, 0, __LINE__);
9450 if (rack->r_ctl.rc_prr_delivered > rack->r_ctl.rc_prr_out)
9451 limit = (rack->r_ctl.rc_prr_delivered - rack->r_ctl.rc_prr_out);
9454 if (changed > limit)
9456 limit += ctf_fixed_maxseg(tp);
9457 if (tp->snd_ssthresh > pipe) {
9458 rack->r_ctl.rc_prr_sndcnt = min((tp->snd_ssthresh - pipe), limit);
9459 rack_log_to_prr(rack, 11, 0, __LINE__);
9461 rack->r_ctl.rc_prr_sndcnt = min(0, limit);
9462 rack_log_to_prr(rack, 12, 0, __LINE__);
9468 rack_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th, int entered_recovery, int dup_ack_struck)
9471 struct tcp_rack *rack;
9472 struct rack_sendmap *rsm;
9473 struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1];
9474 register uint32_t th_ack;
9475 int32_t i, j, k, num_sack_blks = 0;
9476 uint32_t cts, acked, ack_point;
9477 int loop_start = 0, moved_two = 0;
9481 INP_WLOCK_ASSERT(tptoinpcb(tp));
9482 if (tcp_get_flags(th) & TH_RST) {
9483 /* We don't log resets */
9486 rack = (struct tcp_rack *)tp->t_fb_ptr;
9487 cts = tcp_get_usecs(NULL);
9488 rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
9490 th_ack = th->th_ack;
9491 if (rack->sack_attack_disable == 0)
9492 rack_do_decay(rack);
9493 if (BYTES_THIS_ACK(tp, th) >= ctf_fixed_maxseg(rack->rc_tp)) {
9495 * You only get credit for
9496 * MSS and greater (and you get extra
9497 * credit for larger cum-ack moves).
9501 ac = BYTES_THIS_ACK(tp, th) / ctf_fixed_maxseg(rack->rc_tp);
9502 rack->r_ctl.ack_count += ac;
9503 counter_u64_add(rack_ack_total, ac);
9505 if (rack->r_ctl.ack_count > 0xfff00000) {
9507 * reduce the number to keep us under
9510 rack->r_ctl.ack_count /= 2;
9511 rack->r_ctl.sack_count /= 2;
9513 if (SEQ_GT(th_ack, tp->snd_una)) {
9514 rack_log_progress_event(rack, tp, ticks, PROGRESS_UPDATE, __LINE__);
9515 tp->t_acktime = ticks;
9517 if (rsm && SEQ_GT(th_ack, rsm->r_start))
9518 changed = th_ack - rsm->r_start;
9520 rack_process_to_cumack(tp, rack, th_ack, cts, to);
9522 if ((to->to_flags & TOF_SACK) == 0) {
9523 /* We are done nothing left and no sack. */
9524 rack_handle_might_revert(tp, rack);
9526 * For cases where we struck a dup-ack
9527 * with no SACK, add to the changes so
9528 * PRR will work right.
9530 if (dup_ack_struck && (changed == 0)) {
9531 changed += ctf_fixed_maxseg(rack->rc_tp);
9535 /* Sack block processing */
9536 if (SEQ_GT(th_ack, tp->snd_una))
9539 ack_point = tp->snd_una;
9540 for (i = 0; i < to->to_nsacks; i++) {
9541 bcopy((to->to_sacks + i * TCPOLEN_SACK),
9542 &sack, sizeof(sack));
9543 sack.start = ntohl(sack.start);
9544 sack.end = ntohl(sack.end);
9545 if (SEQ_GT(sack.end, sack.start) &&
9546 SEQ_GT(sack.start, ack_point) &&
9547 SEQ_LT(sack.start, tp->snd_max) &&
9548 SEQ_GT(sack.end, ack_point) &&
9549 SEQ_LEQ(sack.end, tp->snd_max)) {
9550 sack_blocks[num_sack_blks] = sack;
9552 } else if (SEQ_LEQ(sack.start, th_ack) &&
9553 SEQ_LEQ(sack.end, th_ack)) {
9556 was_tlp = rack_note_dsack(rack, sack.start, sack.end);
9558 * Its a D-SACK block.
9560 tcp_record_dsack(tp, sack.start, sack.end, was_tlp);
9563 if (rack->rc_dsack_round_seen) {
9564 /* Is the dsack roound over? */
9565 if (SEQ_GEQ(th_ack, rack->r_ctl.dsack_round_end)) {
9567 rack->rc_dsack_round_seen = 0;
9568 rack_log_dsack_event(rack, 3, __LINE__, 0, 0);
9572 * Sort the SACK blocks so we can update the rack scoreboard with
9575 num_sack_blks = sack_filter_blks(&rack->r_ctl.rack_sf, sack_blocks,
9576 num_sack_blks, th->th_ack);
9577 ctf_log_sack_filter(rack->rc_tp, num_sack_blks, sack_blocks);
9578 if (num_sack_blks == 0) {
9579 /* Nothing to sack (DSACKs?) */
9580 goto out_with_totals;
9582 if (num_sack_blks < 2) {
9583 /* Only one, we don't need to sort */
9586 /* Sort the sacks */
9587 for (i = 0; i < num_sack_blks; i++) {
9588 for (j = i + 1; j < num_sack_blks; j++) {
9589 if (SEQ_GT(sack_blocks[i].end, sack_blocks[j].end)) {
9590 sack = sack_blocks[i];
9591 sack_blocks[i] = sack_blocks[j];
9592 sack_blocks[j] = sack;
9597 * Now are any of the sack block ends the same (yes some
9598 * implementations send these)?
9601 if (num_sack_blks == 0)
9602 goto out_with_totals;
9603 if (num_sack_blks > 1) {
9604 for (i = 0; i < num_sack_blks; i++) {
9605 for (j = i + 1; j < num_sack_blks; j++) {
9606 if (sack_blocks[i].end == sack_blocks[j].end) {
9608 * Ok these two have the same end we
9609 * want the smallest end and then
9610 * throw away the larger and start
9613 if (SEQ_LT(sack_blocks[j].start, sack_blocks[i].start)) {
9615 * The second block covers
9616 * more area use that
9618 sack_blocks[i].start = sack_blocks[j].start;
9621 * Now collapse out the dup-sack and
9624 for (k = (j + 1); k < num_sack_blks; k++) {
9625 sack_blocks[j].start = sack_blocks[k].start;
9626 sack_blocks[j].end = sack_blocks[k].end;
9637 * First lets look to see if
9638 * we have retransmitted and
9639 * can use the transmit next?
9641 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
9643 SEQ_GT(sack_blocks[0].end, rsm->r_start) &&
9644 SEQ_LT(sack_blocks[0].start, rsm->r_end)) {
9646 * We probably did the FR and the next
9647 * SACK in continues as we would expect.
9649 acked = rack_proc_sack_blk(tp, rack, &sack_blocks[0], to, &rsm, cts, &moved_two);
9651 rack->r_wanted_output = 1;
9654 if (num_sack_blks == 1) {
9656 * This is what we would expect from
9657 * a normal implementation to happen
9658 * after we have retransmitted the FR,
9659 * i.e the sack-filter pushes down
9660 * to 1 block and the next to be retransmitted
9661 * is the sequence in the sack block (has more
9662 * are acked). Count this as ACK'd data to boost
9663 * up the chances of recovering any false positives.
9665 rack->r_ctl.ack_count += (acked / ctf_fixed_maxseg(rack->rc_tp));
9666 counter_u64_add(rack_ack_total, (acked / ctf_fixed_maxseg(rack->rc_tp)));
9667 counter_u64_add(rack_express_sack, 1);
9668 if (rack->r_ctl.ack_count > 0xfff00000) {
9670 * reduce the number to keep us under
9673 rack->r_ctl.ack_count /= 2;
9674 rack->r_ctl.sack_count /= 2;
9676 goto out_with_totals;
9679 * Start the loop through the
9680 * rest of blocks, past the first block.
9686 /* Its a sack of some sort */
9687 rack->r_ctl.sack_count++;
9688 if (rack->r_ctl.sack_count > 0xfff00000) {
9690 * reduce the number to keep us under
9693 rack->r_ctl.ack_count /= 2;
9694 rack->r_ctl.sack_count /= 2;
9696 counter_u64_add(rack_sack_total, 1);
9697 if (rack->sack_attack_disable) {
9698 /* An attacker disablement is in place */
9699 if (num_sack_blks > 1) {
9700 rack->r_ctl.sack_count += (num_sack_blks - 1);
9701 rack->r_ctl.sack_moved_extra++;
9702 counter_u64_add(rack_move_some, 1);
9703 if (rack->r_ctl.sack_moved_extra > 0xfff00000) {
9704 rack->r_ctl.sack_moved_extra /= 2;
9705 rack->r_ctl.sack_noextra_move /= 2;
9710 rsm = rack->r_ctl.rc_sacklast;
9711 for (i = loop_start; i < num_sack_blks; i++) {
9712 acked = rack_proc_sack_blk(tp, rack, &sack_blocks[i], to, &rsm, cts, &moved_two);
9714 rack->r_wanted_output = 1;
9719 * If we did not get a SACK for at least a MSS and
9720 * had to move at all, or if we moved more than our
9721 * threshold, it counts against the "extra" move.
9723 rack->r_ctl.sack_moved_extra += moved_two;
9724 counter_u64_add(rack_move_some, 1);
9727 * else we did not have to move
9728 * any more than we would expect.
9730 rack->r_ctl.sack_noextra_move++;
9731 counter_u64_add(rack_move_none, 1);
9733 if (moved_two && (acked < ctf_fixed_maxseg(rack->rc_tp))) {
9735 * If the SACK was not a full MSS then
9736 * we add to sack_count the number of
9737 * MSS's (or possibly more than
9738 * a MSS if its a TSO send) we had to skip by.
9740 rack->r_ctl.sack_count += moved_two;
9741 counter_u64_add(rack_sack_total, moved_two);
9744 * Now we need to setup for the next
9745 * round. First we make sure we won't
9746 * exceed the size of our uint32_t on
9747 * the various counts, and then clear out
9750 if ((rack->r_ctl.sack_moved_extra > 0xfff00000) ||
9751 (rack->r_ctl.sack_noextra_move > 0xfff00000)) {
9752 rack->r_ctl.sack_moved_extra /= 2;
9753 rack->r_ctl.sack_noextra_move /= 2;
9755 if (rack->r_ctl.sack_count > 0xfff00000) {
9756 rack->r_ctl.ack_count /= 2;
9757 rack->r_ctl.sack_count /= 2;
9762 if (num_sack_blks > 1) {
9764 * You get an extra stroke if
9765 * you have more than one sack-blk, this
9766 * could be where we are skipping forward
9767 * and the sack-filter is still working, or
9768 * it could be an attacker constantly
9771 rack->r_ctl.sack_moved_extra++;
9772 counter_u64_add(rack_move_some, 1);
9775 #ifdef NETFLIX_EXP_DETECTION
9776 rack_do_detection(tp, rack, BYTES_THIS_ACK(tp, th), ctf_fixed_maxseg(rack->rc_tp));
9779 /* Something changed cancel the rack timer */
9780 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
9782 tsused = tcp_get_usecs(NULL);
9783 rsm = tcp_rack_output(tp, rack, tsused);
9784 if ((!IN_FASTRECOVERY(tp->t_flags)) &&
9786 ((rsm->r_flags & RACK_MUST_RXT) == 0)) {
9787 /* Enter recovery */
9788 entered_recovery = 1;
9789 rack_cong_signal(tp, CC_NDUPACK, tp->snd_una, __LINE__);
9791 * When we enter recovery we need to assure we send
9794 if (rack->rack_no_prr == 0) {
9795 rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp);
9796 rack_log_to_prr(rack, 8, 0, __LINE__);
9798 rack->r_timer_override = 1;
9800 rack->r_ctl.rc_agg_early = 0;
9801 } else if (IN_FASTRECOVERY(tp->t_flags) &&
9803 (rack->r_rr_config == 3)) {
9805 * Assure we can output and we get no
9806 * remembered pace time except the retransmit.
9808 rack->r_timer_override = 1;
9809 rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
9810 rack->r_ctl.rc_resend = rsm;
9812 if (IN_FASTRECOVERY(tp->t_flags) &&
9813 (rack->rack_no_prr == 0) &&
9814 (entered_recovery == 0)) {
9815 rack_update_prr(tp, rack, changed, th_ack);
9816 if ((rsm && (rack->r_ctl.rc_prr_sndcnt >= ctf_fixed_maxseg(tp)) &&
9817 ((tcp_in_hpts(rack->rc_inp) == 0) &&
9818 ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0)))) {
9820 * If you are pacing output you don't want
9824 rack->r_ctl.rc_agg_early = 0;
9825 rack->r_timer_override = 1;
9831 rack_strike_dupack(struct tcp_rack *rack)
9833 struct rack_sendmap *rsm;
9835 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
9836 while (rsm && (rsm->r_dupack >= DUP_ACK_THRESHOLD)) {
9837 rsm = TAILQ_NEXT(rsm, r_tnext);
9838 if (rsm->r_flags & RACK_MUST_RXT) {
9839 /* Sendmap entries that are marked to
9840 * be retransmitted do not need dupack's
9841 * struck. We get these marks for a number
9842 * of reasons (rxt timeout with no sack,
9843 * mtu change, or rwnd collapses). When
9844 * these events occur, we know we must retransmit
9845 * them and mark the sendmap entries. Dupack counting
9846 * is not needed since we are already set to retransmit
9847 * it as soon as we can.
9852 if (rsm && (rsm->r_dupack < 0xff)) {
9854 if (rsm->r_dupack >= DUP_ACK_THRESHOLD) {
9858 * Here we see if we need to retransmit. For
9859 * a SACK type connection if enough time has passed
9860 * we will get a return of the rsm. For a non-sack
9861 * connection we will get the rsm returned if the
9862 * dupack value is 3 or more.
9864 cts = tcp_get_usecs(&tv);
9865 rack->r_ctl.rc_resend = tcp_rack_output(rack->rc_tp, rack, cts);
9866 if (rack->r_ctl.rc_resend != NULL) {
9867 if (!IN_FASTRECOVERY(rack->rc_tp->t_flags)) {
9868 rack_cong_signal(rack->rc_tp, CC_NDUPACK,
9869 rack->rc_tp->snd_una, __LINE__);
9871 rack->r_wanted_output = 1;
9872 rack->r_timer_override = 1;
9873 rack_log_retran_reason(rack, rsm, __LINE__, 1, 3);
9876 rack_log_retran_reason(rack, rsm, __LINE__, 0, 3);
9882 rack_check_bottom_drag(struct tcpcb *tp,
9883 struct tcp_rack *rack,
9884 struct socket *so, int32_t acked)
9886 uint32_t segsiz, minseg;
9888 segsiz = ctf_fixed_maxseg(tp);
9891 if (tp->snd_max == tp->snd_una) {
9893 * We are doing dynamic pacing and we are way
9894 * under. Basically everything got acked while
9895 * we were still waiting on the pacer to expire.
9897 * This means we need to boost the b/w in
9898 * addition to any earlier boosting of
9901 rack->rc_dragged_bottom = 1;
9902 rack_validate_multipliers_at_or_above100(rack);
9904 * Lets use the segment bytes acked plus
9905 * the lowest RTT seen as the basis to
9906 * form a b/w estimate. This will be off
9907 * due to the fact that the true estimate
9908 * should be around 1/2 the time of the RTT
9909 * but we can settle for that.
9911 if ((rack->r_ctl.rack_rs.rs_flags & RACK_RTT_VALID) &&
9913 uint64_t bw, calc_bw, rtt;
9915 rtt = rack->r_ctl.rack_rs.rs_us_rtt;
9917 /* no us sample is there a ms one? */
9918 if (rack->r_ctl.rack_rs.rs_rtt_lowest) {
9919 rtt = rack->r_ctl.rack_rs.rs_rtt_lowest;
9921 goto no_measurement;
9925 calc_bw = bw * 1000000;
9927 if (rack->r_ctl.last_max_bw &&
9928 (rack->r_ctl.last_max_bw < calc_bw)) {
9930 * If we have a last calculated max bw
9933 calc_bw = rack->r_ctl.last_max_bw;
9935 /* now plop it in */
9936 if (rack->rc_gp_filled == 0) {
9937 if (calc_bw > ONE_POINT_TWO_MEG) {
9939 * If we have no measurement
9940 * don't let us set in more than
9941 * 1.2Mbps. If we are still too
9942 * low after pacing with this we
9943 * will hopefully have a max b/w
9944 * available to sanity check things.
9946 calc_bw = ONE_POINT_TWO_MEG;
9948 rack->r_ctl.rc_rtt_diff = 0;
9949 rack->r_ctl.gp_bw = calc_bw;
9950 rack->rc_gp_filled = 1;
9951 if (rack->r_ctl.num_measurements < RACK_REQ_AVG)
9952 rack->r_ctl.num_measurements = RACK_REQ_AVG;
9953 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
9954 } else if (calc_bw > rack->r_ctl.gp_bw) {
9955 rack->r_ctl.rc_rtt_diff = 0;
9956 if (rack->r_ctl.num_measurements < RACK_REQ_AVG)
9957 rack->r_ctl.num_measurements = RACK_REQ_AVG;
9958 rack->r_ctl.gp_bw = calc_bw;
9959 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
9961 rack_increase_bw_mul(rack, -1, 0, 0, 1);
9962 if ((rack->gp_ready == 0) &&
9963 (rack->r_ctl.num_measurements >= rack->r_ctl.req_measurements)) {
9964 /* We have enough measurements now */
9966 rack_set_cc_pacing(rack);
9967 if (rack->defer_options)
9968 rack_apply_deferred_options(rack);
9971 * For acks over 1mss we do a extra boost to simulate
9972 * where we would get 2 acks (we want 110 for the mul).
9975 rack_increase_bw_mul(rack, -1, 0, 0, 1);
9978 * zero rtt possibly?, settle for just an old increase.
9981 rack_increase_bw_mul(rack, -1, 0, 0, 1);
9983 } else if ((IN_FASTRECOVERY(tp->t_flags) == 0) &&
9984 (sbavail(&so->so_snd) > max((segsiz * (4 + rack_req_segs)),
9986 (rack->r_ctl.cwnd_to_use > max((segsiz * (rack_req_segs + 2)), minseg)) &&
9987 (tp->snd_wnd > max((segsiz * (rack_req_segs + 2)), minseg)) &&
9988 (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) <=
9989 (segsiz * rack_req_segs))) {
9991 * We are doing dynamic GP pacing and
9992 * we have everything except 1MSS or less
9993 * bytes left out. We are still pacing away.
9994 * And there is data that could be sent, This
9995 * means we are inserting delayed ack time in
9996 * our measurements because we are pacing too slow.
9998 rack_validate_multipliers_at_or_above100(rack);
9999 rack->rc_dragged_bottom = 1;
10000 rack_increase_bw_mul(rack, -1, 0, 0, 1);
10007 rack_gain_for_fastoutput(struct tcp_rack *rack, struct tcpcb *tp, struct socket *so, uint32_t acked_amount)
10010 * The fast output path is enabled and we
10011 * have moved the cumack forward. Lets see if
10012 * we can expand forward the fast path length by
10013 * that amount. What we would ideally like to
10014 * do is increase the number of bytes in the
10015 * fast path block (left_to_send) by the
10016 * acked amount. However we have to gate that
10018 * 1) The amount outstanding and the rwnd of the peer
10019 * (i.e. we don't want to exceed the rwnd of the peer).
10021 * 2) The amount of data left in the socket buffer (i.e.
10022 * we can't send beyond what is in the buffer).
10024 * Note that this does not take into account any increase
10025 * in the cwnd. We will only extend the fast path by
10028 uint32_t new_total, gating_val;
10030 new_total = acked_amount + rack->r_ctl.fsb.left_to_send;
10031 gating_val = min((sbavail(&so->so_snd) - (tp->snd_max - tp->snd_una)),
10032 (tp->snd_wnd - (tp->snd_max - tp->snd_una)));
10033 if (new_total <= gating_val) {
10034 /* We can increase left_to_send by the acked amount */
10035 counter_u64_add(rack_extended_rfo, 1);
10036 rack->r_ctl.fsb.left_to_send = new_total;
10037 KASSERT((rack->r_ctl.fsb.left_to_send <= (sbavail(&rack->rc_inp->inp_socket->so_snd) - (tp->snd_max - tp->snd_una))),
10038 ("rack:%p left_to_send:%u sbavail:%u out:%u",
10039 rack, rack->r_ctl.fsb.left_to_send,
10040 sbavail(&rack->rc_inp->inp_socket->so_snd),
10041 (tp->snd_max - tp->snd_una)));
10047 rack_adjust_sendmap(struct tcp_rack *rack, struct sockbuf *sb, tcp_seq snd_una)
10050 * Here any sendmap entry that points to the
10051 * beginning mbuf must be adjusted to the correct
10052 * offset. This must be called with:
10053 * 1) The socket buffer locked
10054 * 2) snd_una adjusted to its new postion.
10056 * Note that (2) implies rack_ack_received has also
10059 * We grab the first mbuf in the socket buffer and
10060 * then go through the front of the sendmap, recalculating
10061 * the stored offset for any sendmap entry that has
10062 * that mbuf. We must use the sb functions to do this
10063 * since its possible an add was done has well as
10064 * the subtraction we may have just completed. This should
10065 * not be a penalty though, since we just referenced the sb
10066 * to go in and trim off the mbufs that we freed (of course
10067 * there will be a penalty for the sendmap references though).
10070 struct rack_sendmap *rsm;
10072 SOCKBUF_LOCK_ASSERT(sb);
10074 rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
10075 if ((rsm == NULL) || (m == NULL)) {
10076 /* Nothing outstanding */
10079 while (rsm->m && (rsm->m == m)) {
10080 /* one to adjust */
10085 tm = sbsndmbuf(sb, (rsm->r_start - snd_una), &soff);
10086 if (rsm->orig_m_len != m->m_len) {
10087 rack_adjust_orig_mlen(rsm);
10089 if (rsm->soff != soff) {
10091 * This is not a fatal error, we anticipate it
10092 * might happen (the else code), so we count it here
10093 * so that under invariant we can see that it really
10096 counter_u64_add(rack_adjust_map_bw, 1);
10101 rsm->orig_m_len = rsm->m->m_len;
10103 rsm->orig_m_len = 0;
10105 rsm->m = sbsndmbuf(sb, (rsm->r_start - snd_una), &rsm->soff);
10107 rsm->orig_m_len = rsm->m->m_len;
10109 rsm->orig_m_len = 0;
10111 rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree,
10119 * Return value of 1, we do not need to call rack_process_data().
10120 * return value of 0, rack_process_data can be called.
10121 * For ret_val if its 0 the TCP is locked, if its non-zero
10122 * its unlocked and probably unsafe to touch the TCB.
10125 rack_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so,
10126 struct tcpcb *tp, struct tcpopt *to,
10127 uint32_t tiwin, int32_t tlen,
10128 int32_t * ofia, int32_t thflags, int32_t *ret_val)
10130 int32_t ourfinisacked = 0;
10131 int32_t nsegs, acked_amount;
10133 struct mbuf *mfree;
10134 struct tcp_rack *rack;
10135 int32_t under_pacing = 0;
10136 int32_t recovery = 0;
10138 INP_WLOCK_ASSERT(tptoinpcb(tp));
10140 rack = (struct tcp_rack *)tp->t_fb_ptr;
10141 if (SEQ_GT(th->th_ack, tp->snd_max)) {
10142 __ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val,
10143 &rack->r_ctl.challenge_ack_ts,
10144 &rack->r_ctl.challenge_ack_cnt);
10145 rack->r_wanted_output = 1;
10148 if (rack->gp_ready &&
10149 (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
10152 if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) {
10153 int in_rec, dup_ack_struck = 0;
10155 in_rec = IN_FASTRECOVERY(tp->t_flags);
10156 if (rack->rc_in_persist) {
10157 tp->t_rxtshift = 0;
10158 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
10159 rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
10161 if ((th->th_ack == tp->snd_una) &&
10162 (tiwin == tp->snd_wnd) &&
10163 ((to->to_flags & TOF_SACK) == 0)) {
10164 rack_strike_dupack(rack);
10165 dup_ack_struck = 1;
10167 rack_log_ack(tp, to, th, ((in_rec == 0) && IN_FASTRECOVERY(tp->t_flags)), dup_ack_struck);
10169 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
10171 * Old ack, behind (or duplicate to) the last one rcv'd
10172 * Note: We mark reordering is occuring if its
10173 * less than and we have not closed our window.
10175 if (SEQ_LT(th->th_ack, tp->snd_una) && (sbspace(&so->so_rcv) > ctf_fixed_maxseg(tp))) {
10176 rack->r_ctl.rc_reorder_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
10181 * If we reach this point, ACK is not a duplicate, i.e., it ACKs
10182 * something we sent.
10184 if (tp->t_flags & TF_NEEDSYN) {
10186 * T/TCP: Connection was half-synchronized, and our SYN has
10187 * been ACK'd (so connection is now fully synchronized). Go
10188 * to non-starred state, increment snd_una for ACK of SYN,
10189 * and check if we can do window scaling.
10191 tp->t_flags &= ~TF_NEEDSYN;
10193 /* Do window scaling? */
10194 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
10195 (TF_RCVD_SCALE | TF_REQ_SCALE)) {
10196 tp->rcv_scale = tp->request_r_scale;
10197 /* Send window already scaled. */
10200 nsegs = max(1, m->m_pkthdr.lro_nsegs);
10202 acked = BYTES_THIS_ACK(tp, th);
10205 * Any time we move the cum-ack forward clear
10206 * keep-alive tied probe-not-answered. The
10207 * persists clears its own on entry.
10209 rack->probe_not_answered = 0;
10211 KMOD_TCPSTAT_ADD(tcps_rcvackpack, nsegs);
10212 KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked);
10214 * If we just performed our first retransmit, and the ACK arrives
10215 * within our recovery window, then it was a mistake to do the
10216 * retransmit in the first place. Recover our original cwnd and
10217 * ssthresh, and proceed to transmit where we left off.
10219 if ((tp->t_flags & TF_PREVVALID) &&
10220 ((tp->t_flags & TF_RCVD_TSTMP) == 0)) {
10221 tp->t_flags &= ~TF_PREVVALID;
10222 if (tp->t_rxtshift == 1 &&
10223 (int)(ticks - tp->t_badrxtwin) < 0)
10224 rack_cong_signal(tp, CC_RTO_ERR, th->th_ack, __LINE__);
10227 /* assure we are not backed off */
10228 tp->t_rxtshift = 0;
10229 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
10230 rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
10231 rack->rc_tlp_in_progress = 0;
10232 rack->r_ctl.rc_tlp_cnt_out = 0;
10234 * If it is the RXT timer we want to
10235 * stop it, so we can restart a TLP.
10237 if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
10238 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
10239 #ifdef NETFLIX_HTTP_LOGGING
10240 tcp_http_check_for_comp(rack->rc_tp, th->th_ack);
10244 * If we have a timestamp reply, update smoothed round trip time. If
10245 * no timestamp is present but transmit timer is running and timed
10246 * sequence number was acked, update smoothed round trip time. Since
10247 * we now have an rtt measurement, cancel the timer backoff (cf.,
10248 * Phil Karn's retransmit alg.). Recompute the initial retransmit
10251 * Some boxes send broken timestamp replies during the SYN+ACK
10252 * phase, ignore timestamps of 0 or we could calculate a huge RTT
10253 * and blow up the retransmit timer.
10256 * If all outstanding data is acked, stop retransmit timer and
10257 * remember to restart (more output or persist). If there is more
10258 * data to be acked, restart retransmit timer, using current
10259 * (possibly backed-off) value.
10263 *ofia = ourfinisacked;
10266 if (IN_RECOVERY(tp->t_flags)) {
10267 if (SEQ_LT(th->th_ack, tp->snd_recover) &&
10268 (SEQ_LT(th->th_ack, tp->snd_max))) {
10269 tcp_rack_partialack(tp);
10271 rack_post_recovery(tp, th->th_ack);
10276 * Let the congestion control algorithm update congestion control
10277 * related information. This typically means increasing the
10278 * congestion window.
10280 rack_ack_received(tp, rack, th->th_ack, nsegs, CC_ACK, recovery);
10281 SOCKBUF_LOCK(&so->so_snd);
10282 acked_amount = min(acked, (int)sbavail(&so->so_snd));
10283 tp->snd_wnd -= acked_amount;
10284 mfree = sbcut_locked(&so->so_snd, acked_amount);
10285 if ((sbused(&so->so_snd) == 0) &&
10286 (acked > acked_amount) &&
10287 (tp->t_state >= TCPS_FIN_WAIT_1) &&
10288 (tp->t_flags & TF_SENTFIN)) {
10290 * We must be sure our fin
10291 * was sent and acked (we can be
10292 * in FIN_WAIT_1 without having
10297 tp->snd_una = th->th_ack;
10298 if (acked_amount && sbavail(&so->so_snd))
10299 rack_adjust_sendmap(rack, &so->so_snd, tp->snd_una);
10300 rack_log_wakeup(tp,rack, &so->so_snd, acked, 2);
10301 /* NB: sowwakeup_locked() does an implicit unlock. */
10302 sowwakeup_locked(so);
10304 if (SEQ_GT(tp->snd_una, tp->snd_recover))
10305 tp->snd_recover = tp->snd_una;
10307 if (SEQ_LT(tp->snd_nxt, tp->snd_una)) {
10308 tp->snd_nxt = tp->snd_una;
10310 if (under_pacing &&
10311 (rack->use_fixed_rate == 0) &&
10312 (rack->in_probe_rtt == 0) &&
10313 rack->rc_gp_dyn_mul &&
10314 rack->rc_always_pace) {
10315 /* Check if we are dragging bottom */
10316 rack_check_bottom_drag(tp, rack, so, acked);
10318 if (tp->snd_una == tp->snd_max) {
10319 /* Nothing left outstanding */
10320 tp->t_flags &= ~TF_PREVVALID;
10321 rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
10322 rack->r_ctl.retran_during_recovery = 0;
10323 rack->r_ctl.dsack_byte_cnt = 0;
10324 if (rack->r_ctl.rc_went_idle_time == 0)
10325 rack->r_ctl.rc_went_idle_time = 1;
10326 rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
10327 if (sbavail(&tptosocket(tp)->so_snd) == 0)
10329 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
10330 /* Set need output so persist might get set */
10331 rack->r_wanted_output = 1;
10332 sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
10333 if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
10334 (sbavail(&so->so_snd) == 0) &&
10335 (tp->t_flags2 & TF2_DROP_AF_DATA)) {
10337 * The socket was gone and the
10338 * peer sent data (now or in the past), time to
10342 /* tcp_close will kill the inp pre-log the Reset */
10343 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
10344 tp = tcp_close(tp);
10345 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen);
10350 *ofia = ourfinisacked;
10356 rack_log_collapse(struct tcp_rack *rack, uint32_t cnt, uint32_t split, uint32_t out, int line,
10357 int dir, uint32_t flags, struct rack_sendmap *rsm)
10359 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
10360 union tcp_log_stackspecific log;
10363 memset(&log, 0, sizeof(log));
10364 log.u_bbr.flex1 = cnt;
10365 log.u_bbr.flex2 = split;
10366 log.u_bbr.flex3 = out;
10367 log.u_bbr.flex4 = line;
10368 log.u_bbr.flex5 = rack->r_must_retran;
10369 log.u_bbr.flex6 = flags;
10370 log.u_bbr.flex7 = rack->rc_has_collapsed;
10371 log.u_bbr.flex8 = dir; /*
10372 * 1 is collapsed, 0 is uncollapsed,
10373 * 2 is log of a rsm being marked, 3 is a split.
10376 log.u_bbr.rttProp = 0;
10378 log.u_bbr.rttProp = (uint64_t)rsm;
10379 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
10380 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
10381 TCP_LOG_EVENTP(rack->rc_tp, NULL,
10382 &rack->rc_inp->inp_socket->so_rcv,
10383 &rack->rc_inp->inp_socket->so_snd,
10384 TCP_RACK_LOG_COLLAPSE, 0,
10385 0, &log, false, &tv);
10390 rack_collapsed_window(struct tcp_rack *rack, uint32_t out, int line)
10393 * Here all we do is mark the collapsed point and set the flag.
10394 * This may happen again and again, but there is no
10395 * sense splitting our map until we know where the
10396 * peer finally lands in the collapse.
10398 rack_trace_point(rack, RACK_TP_COLLAPSED_WND);
10399 if ((rack->rc_has_collapsed == 0) ||
10400 (rack->r_ctl.last_collapse_point != (rack->rc_tp->snd_una + rack->rc_tp->snd_wnd)))
10401 counter_u64_add(rack_collapsed_win_seen, 1);
10402 rack->r_ctl.last_collapse_point = rack->rc_tp->snd_una + rack->rc_tp->snd_wnd;
10403 rack->r_ctl.high_collapse_point = rack->rc_tp->snd_max;
10404 rack->rc_has_collapsed = 1;
10405 rack->r_collapse_point_valid = 1;
10406 rack_log_collapse(rack, 0, 0, rack->r_ctl.last_collapse_point, line, 1, 0, NULL);
10410 rack_un_collapse_window(struct tcp_rack *rack, int line)
10412 struct rack_sendmap *nrsm, *rsm, fe;
10413 int cnt = 0, split = 0;
10415 struct rack_sendmap *insret;
10418 memset(&fe, 0, sizeof(fe));
10419 rack->rc_has_collapsed = 0;
10420 fe.r_start = rack->r_ctl.last_collapse_point;
10421 rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
10423 /* Nothing to do maybe the peer ack'ed it all */
10424 rack_log_collapse(rack, 0, 0, ctf_outstanding(rack->rc_tp), line, 0, 0, NULL);
10427 /* Now do we need to split this one? */
10428 if (SEQ_GT(rack->r_ctl.last_collapse_point, rsm->r_start)) {
10429 rack_log_collapse(rack, rsm->r_start, rsm->r_end,
10430 rack->r_ctl.last_collapse_point, line, 3, rsm->r_flags, rsm);
10431 nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT);
10432 if (nrsm == NULL) {
10433 /* We can't get a rsm, mark all? */
10439 rack_clone_rsm(rack, nrsm, rsm, rack->r_ctl.last_collapse_point);
10441 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
10443 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm);
10444 if (insret != NULL) {
10445 panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p",
10446 nrsm, insret, rack, rsm);
10449 rack_log_map_chg(rack->rc_tp, rack, NULL, rsm, nrsm, MAP_SPLIT,
10450 rack->r_ctl.last_collapse_point, __LINE__);
10451 if (rsm->r_in_tmap) {
10452 TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext);
10453 nrsm->r_in_tmap = 1;
10456 * Set in the new RSM as the
10457 * collapsed starting point
10462 RB_FOREACH_FROM(nrsm, rack_rb_tree_head, rsm) {
10463 nrsm->r_flags |= RACK_RWND_COLLAPSED;
10464 rack_log_collapse(rack, nrsm->r_start, nrsm->r_end, 0, line, 4, nrsm->r_flags, nrsm);
10468 counter_u64_add(rack_collapsed_win, 1);
10470 rack_log_collapse(rack, cnt, split, ctf_outstanding(rack->rc_tp), line, 0, 0, NULL);
10474 rack_handle_delayed_ack(struct tcpcb *tp, struct tcp_rack *rack,
10475 int32_t tlen, int32_t tfo_syn)
10477 if (DELAY_ACK(tp, tlen) || tfo_syn) {
10478 if (rack->rc_dack_mode &&
10480 (rack->rc_dack_toggle == 1)) {
10481 goto no_delayed_ack;
10483 rack_timer_cancel(tp, rack,
10484 rack->r_ctl.rc_rcvtime, __LINE__);
10485 tp->t_flags |= TF_DELACK;
10488 rack->r_wanted_output = 1;
10489 tp->t_flags |= TF_ACKNOW;
10490 if (rack->rc_dack_mode) {
10491 if (tp->t_flags & TF_DELACK)
10492 rack->rc_dack_toggle = 1;
10494 rack->rc_dack_toggle = 0;
10500 rack_validate_fo_sendwin_up(struct tcpcb *tp, struct tcp_rack *rack)
10503 * If fast output is in progress, lets validate that
10504 * the new window did not shrink on us and make it
10505 * so fast output should end.
10507 if (rack->r_fast_output) {
10511 * Calculate what we will send if left as is
10512 * and compare that to our send window.
10514 out = ctf_outstanding(tp);
10515 if ((out + rack->r_ctl.fsb.left_to_send) > tp->snd_wnd) {
10516 /* ok we have an issue */
10517 if (out >= tp->snd_wnd) {
10518 /* Turn off fast output the window is met or collapsed */
10519 rack->r_fast_output = 0;
10521 /* we have some room left */
10522 rack->r_ctl.fsb.left_to_send = tp->snd_wnd - out;
10523 if (rack->r_ctl.fsb.left_to_send < ctf_fixed_maxseg(tp)) {
10524 /* If not at least 1 full segment never mind */
10525 rack->r_fast_output = 0;
10534 * Return value of 1, the TCB is unlocked and most
10535 * likely gone, return value of 0, the TCP is still
10539 rack_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so,
10540 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen,
10541 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt)
10544 * Update window information. Don't look at window if no ACK: TAC's
10545 * send garbage on first SYN.
10549 struct tcp_rack *rack;
10551 INP_WLOCK_ASSERT(tptoinpcb(tp));
10553 rack = (struct tcp_rack *)tp->t_fb_ptr;
10554 nsegs = max(1, m->m_pkthdr.lro_nsegs);
10555 if ((thflags & TH_ACK) &&
10556 (SEQ_LT(tp->snd_wl1, th->th_seq) ||
10557 (tp->snd_wl1 == th->th_seq && (SEQ_LT(tp->snd_wl2, th->th_ack) ||
10558 (tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))))) {
10559 /* keep track of pure window updates */
10561 tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd)
10562 KMOD_TCPSTAT_INC(tcps_rcvwinupd);
10563 tp->snd_wnd = tiwin;
10564 rack_validate_fo_sendwin_up(tp, rack);
10565 tp->snd_wl1 = th->th_seq;
10566 tp->snd_wl2 = th->th_ack;
10567 if (tp->snd_wnd > tp->max_sndwnd)
10568 tp->max_sndwnd = tp->snd_wnd;
10569 rack->r_wanted_output = 1;
10570 } else if (thflags & TH_ACK) {
10571 if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) {
10572 tp->snd_wnd = tiwin;
10573 rack_validate_fo_sendwin_up(tp, rack);
10574 tp->snd_wl1 = th->th_seq;
10575 tp->snd_wl2 = th->th_ack;
10578 if (tp->snd_wnd < ctf_outstanding(tp))
10579 /* The peer collapsed the window */
10580 rack_collapsed_window(rack, ctf_outstanding(tp), __LINE__);
10581 else if (rack->rc_has_collapsed)
10582 rack_un_collapse_window(rack, __LINE__);
10583 if ((rack->r_collapse_point_valid) &&
10584 (SEQ_GT(th->th_ack, rack->r_ctl.high_collapse_point)))
10585 rack->r_collapse_point_valid = 0;
10586 /* Was persist timer active and now we have window space? */
10587 if ((rack->rc_in_persist != 0) &&
10588 (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
10589 rack->r_ctl.rc_pace_min_segs))) {
10590 rack_exit_persist(tp, rack, rack->r_ctl.rc_rcvtime);
10591 tp->snd_nxt = tp->snd_max;
10592 /* Make sure we output to start the timer */
10593 rack->r_wanted_output = 1;
10595 /* Do we enter persists? */
10596 if ((rack->rc_in_persist == 0) &&
10597 (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
10598 TCPS_HAVEESTABLISHED(tp->t_state) &&
10599 ((tp->snd_max == tp->snd_una) || rack->rc_has_collapsed) &&
10600 sbavail(&tptosocket(tp)->so_snd) &&
10601 (sbavail(&tptosocket(tp)->so_snd) > tp->snd_wnd)) {
10603 * Here the rwnd is less than
10604 * the pacing size, we are established,
10605 * nothing is outstanding, and there is
10606 * data to send. Enter persists.
10608 rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime);
10610 if (tp->t_flags2 & TF2_DROP_AF_DATA) {
10615 * don't process the URG bit, ignore them drag
10618 tp->rcv_up = tp->rcv_nxt;
10621 * Process the segment text, merging it into the TCP sequencing
10622 * queue, and arranging for acknowledgment of receipt if necessary.
10623 * This process logically involves adjusting tp->rcv_wnd as data is
10624 * presented to the user (this happens in tcp_usrreq.c, case
10625 * PRU_RCVD). If a FIN has already been received on this connection
10626 * then we just ignore the text.
10628 tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) &&
10629 IS_FASTOPEN(tp->t_flags));
10630 if ((tlen || (thflags & TH_FIN) || (tfo_syn && tlen > 0)) &&
10631 TCPS_HAVERCVDFIN(tp->t_state) == 0) {
10632 tcp_seq save_start = th->th_seq;
10633 tcp_seq save_rnxt = tp->rcv_nxt;
10634 int save_tlen = tlen;
10636 m_adj(m, drop_hdrlen); /* delayed header drop */
10638 * Insert segment which includes th into TCP reassembly
10639 * queue with control block tp. Set thflags to whether
10640 * reassembly now includes a segment with FIN. This handles
10641 * the common case inline (segment is the next to be
10642 * received on an established connection, and the queue is
10643 * empty), avoiding linkage into and removal from the queue
10644 * and repetition of various conversions. Set DELACK for
10645 * segments received in order, but ack immediately when
10646 * segments are out of order (so fast retransmit can work).
10648 if (th->th_seq == tp->rcv_nxt &&
10650 (TCPS_HAVEESTABLISHED(tp->t_state) ||
10652 #ifdef NETFLIX_SB_LIMITS
10653 u_int mcnt, appended;
10655 if (so->so_rcv.sb_shlim) {
10656 mcnt = m_memcnt(m);
10658 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
10659 CFO_NOSLEEP, NULL) == false) {
10660 counter_u64_add(tcp_sb_shlim_fails, 1);
10666 rack_handle_delayed_ack(tp, rack, tlen, tfo_syn);
10667 tp->rcv_nxt += tlen;
10669 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
10670 (tp->t_fbyte_in == 0)) {
10671 tp->t_fbyte_in = ticks;
10672 if (tp->t_fbyte_in == 0)
10673 tp->t_fbyte_in = 1;
10674 if (tp->t_fbyte_out && tp->t_fbyte_in)
10675 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
10677 thflags = tcp_get_flags(th) & TH_FIN;
10678 KMOD_TCPSTAT_ADD(tcps_rcvpack, nsegs);
10679 KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen);
10680 SOCKBUF_LOCK(&so->so_rcv);
10681 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
10684 #ifdef NETFLIX_SB_LIMITS
10687 sbappendstream_locked(&so->so_rcv, m, 0);
10689 rack_log_wakeup(tp,rack, &so->so_rcv, tlen, 1);
10690 /* NB: sorwakeup_locked() does an implicit unlock. */
10691 sorwakeup_locked(so);
10692 #ifdef NETFLIX_SB_LIMITS
10693 if (so->so_rcv.sb_shlim && appended != mcnt)
10694 counter_fo_release(so->so_rcv.sb_shlim,
10699 * XXX: Due to the header drop above "th" is
10700 * theoretically invalid by now. Fortunately
10701 * m_adj() doesn't actually frees any mbufs when
10702 * trimming from the head.
10704 tcp_seq temp = save_start;
10706 thflags = tcp_reass(tp, th, &temp, &tlen, m);
10707 tp->t_flags |= TF_ACKNOW;
10708 if (tp->t_flags & TF_WAKESOR) {
10709 tp->t_flags &= ~TF_WAKESOR;
10710 /* NB: sorwakeup_locked() does an implicit unlock. */
10711 sorwakeup_locked(so);
10714 if ((tp->t_flags & TF_SACK_PERMIT) &&
10716 TCPS_HAVEESTABLISHED(tp->t_state)) {
10717 if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) {
10719 * DSACK actually handled in the fastpath
10722 RACK_OPTS_INC(tcp_sack_path_1);
10723 tcp_update_sack_list(tp, save_start,
10724 save_start + save_tlen);
10725 } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) {
10726 if ((tp->rcv_numsacks >= 1) &&
10727 (tp->sackblks[0].end == save_start)) {
10729 * Partial overlap, recorded at todrop
10732 RACK_OPTS_INC(tcp_sack_path_2a);
10733 tcp_update_sack_list(tp,
10734 tp->sackblks[0].start,
10735 tp->sackblks[0].end);
10737 RACK_OPTS_INC(tcp_sack_path_2b);
10738 tcp_update_dsack_list(tp, save_start,
10739 save_start + save_tlen);
10741 } else if (tlen >= save_tlen) {
10742 /* Update of sackblks. */
10743 RACK_OPTS_INC(tcp_sack_path_3);
10744 tcp_update_dsack_list(tp, save_start,
10745 save_start + save_tlen);
10746 } else if (tlen > 0) {
10747 RACK_OPTS_INC(tcp_sack_path_4);
10748 tcp_update_dsack_list(tp, save_start,
10749 save_start + tlen);
10754 thflags &= ~TH_FIN;
10758 * If FIN is received ACK the FIN and let the user know that the
10759 * connection is closing.
10761 if (thflags & TH_FIN) {
10762 if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
10763 /* The socket upcall is handled by socantrcvmore. */
10766 * If connection is half-synchronized (ie NEEDSYN
10767 * flag on) then delay ACK, so it may be piggybacked
10768 * when SYN is sent. Otherwise, since we received a
10769 * FIN then no more input can be expected, send ACK
10772 if (tp->t_flags & TF_NEEDSYN) {
10773 rack_timer_cancel(tp, rack,
10774 rack->r_ctl.rc_rcvtime, __LINE__);
10775 tp->t_flags |= TF_DELACK;
10777 tp->t_flags |= TF_ACKNOW;
10781 switch (tp->t_state) {
10783 * In SYN_RECEIVED and ESTABLISHED STATES enter the
10784 * CLOSE_WAIT state.
10786 case TCPS_SYN_RECEIVED:
10787 tp->t_starttime = ticks;
10789 case TCPS_ESTABLISHED:
10790 rack_timer_cancel(tp, rack,
10791 rack->r_ctl.rc_rcvtime, __LINE__);
10792 tcp_state_change(tp, TCPS_CLOSE_WAIT);
10796 * If still in FIN_WAIT_1 STATE FIN has not been
10797 * acked so enter the CLOSING state.
10799 case TCPS_FIN_WAIT_1:
10800 rack_timer_cancel(tp, rack,
10801 rack->r_ctl.rc_rcvtime, __LINE__);
10802 tcp_state_change(tp, TCPS_CLOSING);
10806 * In FIN_WAIT_2 state enter the TIME_WAIT state,
10807 * starting the time-wait timer, turning off the
10808 * other standard timers.
10810 case TCPS_FIN_WAIT_2:
10811 rack_timer_cancel(tp, rack,
10812 rack->r_ctl.rc_rcvtime, __LINE__);
10818 * Return any desired output.
10820 if ((tp->t_flags & TF_ACKNOW) ||
10821 (sbavail(&so->so_snd) > (tp->snd_max - tp->snd_una))) {
10822 rack->r_wanted_output = 1;
10828 * Here nothing is really faster, its just that we
10829 * have broken out the fast-data path also just like
10833 rack_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so,
10834 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
10835 uint32_t tiwin, int32_t nxt_pkt, uint8_t iptos)
10838 int32_t newsize = 0; /* automatic sockbuf scaling */
10839 struct tcp_rack *rack;
10840 #ifdef NETFLIX_SB_LIMITS
10841 u_int mcnt, appended;
10845 * The size of tcp_saveipgen must be the size of the max ip header,
10848 u_char tcp_saveipgen[IP6_HDR_LEN];
10849 struct tcphdr tcp_savetcp;
10854 * If last ACK falls within this segment's sequence numbers, record
10855 * the timestamp. NOTE that the test is modified according to the
10856 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26).
10858 if (__predict_false(th->th_seq != tp->rcv_nxt)) {
10861 if (__predict_false(tp->snd_nxt != tp->snd_max)) {
10864 if (tiwin && tiwin != tp->snd_wnd) {
10867 if (__predict_false((tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN)))) {
10870 if (__predict_false((to->to_flags & TOF_TS) &&
10871 (TSTMP_LT(to->to_tsval, tp->ts_recent)))) {
10874 if (__predict_false((th->th_ack != tp->snd_una))) {
10877 if (__predict_false(tlen > sbspace(&so->so_rcv))) {
10880 if ((to->to_flags & TOF_TS) != 0 &&
10881 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
10882 tp->ts_recent_age = tcp_ts_getticks();
10883 tp->ts_recent = to->to_tsval;
10885 rack = (struct tcp_rack *)tp->t_fb_ptr;
10887 * This is a pure, in-sequence data packet with nothing on the
10888 * reassembly queue and we have enough buffer space to take it.
10890 nsegs = max(1, m->m_pkthdr.lro_nsegs);
10892 #ifdef NETFLIX_SB_LIMITS
10893 if (so->so_rcv.sb_shlim) {
10894 mcnt = m_memcnt(m);
10896 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt,
10897 CFO_NOSLEEP, NULL) == false) {
10898 counter_u64_add(tcp_sb_shlim_fails, 1);
10904 /* Clean receiver SACK report if present */
10905 if (tp->rcv_numsacks)
10906 tcp_clean_sackreport(tp);
10907 KMOD_TCPSTAT_INC(tcps_preddat);
10908 tp->rcv_nxt += tlen;
10910 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
10911 (tp->t_fbyte_in == 0)) {
10912 tp->t_fbyte_in = ticks;
10913 if (tp->t_fbyte_in == 0)
10914 tp->t_fbyte_in = 1;
10915 if (tp->t_fbyte_out && tp->t_fbyte_in)
10916 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
10919 * Pull snd_wl1 up to prevent seq wrap relative to th_seq.
10921 tp->snd_wl1 = th->th_seq;
10923 * Pull rcv_up up to prevent seq wrap relative to rcv_nxt.
10925 tp->rcv_up = tp->rcv_nxt;
10926 KMOD_TCPSTAT_ADD(tcps_rcvpack, nsegs);
10927 KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen);
10929 if (so->so_options & SO_DEBUG)
10930 tcp_trace(TA_INPUT, ostate, tp,
10931 (void *)tcp_saveipgen, &tcp_savetcp, 0);
10933 newsize = tcp_autorcvbuf(m, th, so, tp, tlen);
10935 /* Add data to socket buffer. */
10936 SOCKBUF_LOCK(&so->so_rcv);
10937 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
10941 * Set new socket buffer size. Give up when limit is
10945 if (!sbreserve_locked(so, SO_RCV, newsize, NULL))
10946 so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
10947 m_adj(m, drop_hdrlen); /* delayed header drop */
10948 #ifdef NETFLIX_SB_LIMITS
10951 sbappendstream_locked(&so->so_rcv, m, 0);
10952 ctf_calc_rwin(so, tp);
10954 rack_log_wakeup(tp,rack, &so->so_rcv, tlen, 1);
10955 /* NB: sorwakeup_locked() does an implicit unlock. */
10956 sorwakeup_locked(so);
10957 #ifdef NETFLIX_SB_LIMITS
10958 if (so->so_rcv.sb_shlim && mcnt != appended)
10959 counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended);
10961 rack_handle_delayed_ack(tp, rack, tlen, 0);
10962 if (tp->snd_una == tp->snd_max)
10963 sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
10968 * This subfunction is used to try to highly optimize the
10969 * fast path. We again allow window updates that are
10970 * in sequence to remain in the fast-path. We also add
10971 * in the __predict's to attempt to help the compiler.
10972 * Note that if we return a 0, then we can *not* process
10973 * it and the caller should push the packet into the
10977 rack_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so,
10978 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
10979 uint32_t tiwin, int32_t nxt_pkt, uint32_t cts)
10985 * The size of tcp_saveipgen must be the size of the max ip header,
10988 u_char tcp_saveipgen[IP6_HDR_LEN];
10989 struct tcphdr tcp_savetcp;
10992 int32_t under_pacing = 0;
10993 struct tcp_rack *rack;
10995 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) {
10996 /* Old ack, behind (or duplicate to) the last one rcv'd */
10999 if (__predict_false(SEQ_GT(th->th_ack, tp->snd_max))) {
11000 /* Above what we have sent? */
11003 if (__predict_false(tp->snd_nxt != tp->snd_max)) {
11004 /* We are retransmitting */
11007 if (__predict_false(tiwin == 0)) {
11011 if (__predict_false(tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN))) {
11012 /* We need a SYN or a FIN, unlikely.. */
11015 if ((to->to_flags & TOF_TS) && __predict_false(TSTMP_LT(to->to_tsval, tp->ts_recent))) {
11016 /* Timestamp is behind .. old ack with seq wrap? */
11019 if (__predict_false(IN_RECOVERY(tp->t_flags))) {
11020 /* Still recovering */
11023 rack = (struct tcp_rack *)tp->t_fb_ptr;
11024 if (rack->r_ctl.rc_sacked) {
11025 /* We have sack holes on our scoreboard */
11028 /* Ok if we reach here, we can process a fast-ack */
11029 if (rack->gp_ready &&
11030 (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
11033 nsegs = max(1, m->m_pkthdr.lro_nsegs);
11034 rack_log_ack(tp, to, th, 0, 0);
11035 /* Did the window get updated? */
11036 if (tiwin != tp->snd_wnd) {
11037 tp->snd_wnd = tiwin;
11038 rack_validate_fo_sendwin_up(tp, rack);
11039 tp->snd_wl1 = th->th_seq;
11040 if (tp->snd_wnd > tp->max_sndwnd)
11041 tp->max_sndwnd = tp->snd_wnd;
11043 /* Do we exit persists? */
11044 if ((rack->rc_in_persist != 0) &&
11045 (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
11046 rack->r_ctl.rc_pace_min_segs))) {
11047 rack_exit_persist(tp, rack, cts);
11049 /* Do we enter persists? */
11050 if ((rack->rc_in_persist == 0) &&
11051 (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
11052 TCPS_HAVEESTABLISHED(tp->t_state) &&
11053 ((tp->snd_max == tp->snd_una) || rack->rc_has_collapsed) &&
11054 sbavail(&tptosocket(tp)->so_snd) &&
11055 (sbavail(&tptosocket(tp)->so_snd) > tp->snd_wnd)) {
11057 * Here the rwnd is less than
11058 * the pacing size, we are established,
11059 * nothing is outstanding, and there is
11060 * data to send. Enter persists.
11062 rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime);
11065 * If last ACK falls within this segment's sequence numbers, record
11066 * the timestamp. NOTE that the test is modified according to the
11067 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26).
11069 if ((to->to_flags & TOF_TS) != 0 &&
11070 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
11071 tp->ts_recent_age = tcp_ts_getticks();
11072 tp->ts_recent = to->to_tsval;
11075 * This is a pure ack for outstanding data.
11077 KMOD_TCPSTAT_INC(tcps_predack);
11080 * "bad retransmit" recovery.
11082 if ((tp->t_flags & TF_PREVVALID) &&
11083 ((tp->t_flags & TF_RCVD_TSTMP) == 0)) {
11084 tp->t_flags &= ~TF_PREVVALID;
11085 if (tp->t_rxtshift == 1 &&
11086 (int)(ticks - tp->t_badrxtwin) < 0)
11087 rack_cong_signal(tp, CC_RTO_ERR, th->th_ack, __LINE__);
11090 * Recalculate the transmit timer / rtt.
11092 * Some boxes send broken timestamp replies during the SYN+ACK
11093 * phase, ignore timestamps of 0 or we could calculate a huge RTT
11094 * and blow up the retransmit timer.
11096 acked = BYTES_THIS_ACK(tp, th);
11099 /* Run HHOOK_TCP_ESTABLISHED_IN helper hooks. */
11100 hhook_run_tcp_est_in(tp, th, to);
11102 KMOD_TCPSTAT_ADD(tcps_rcvackpack, nsegs);
11103 KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked);
11105 struct mbuf *mfree;
11107 rack_ack_received(tp, rack, th->th_ack, nsegs, CC_ACK, 0);
11108 SOCKBUF_LOCK(&so->so_snd);
11109 mfree = sbcut_locked(&so->so_snd, acked);
11110 tp->snd_una = th->th_ack;
11111 /* Note we want to hold the sb lock through the sendmap adjust */
11112 rack_adjust_sendmap(rack, &so->so_snd, tp->snd_una);
11113 /* Wake up the socket if we have room to write more */
11114 rack_log_wakeup(tp,rack, &so->so_snd, acked, 2);
11115 sowwakeup_locked(so);
11117 tp->t_rxtshift = 0;
11118 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
11119 rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
11120 rack->rc_tlp_in_progress = 0;
11121 rack->r_ctl.rc_tlp_cnt_out = 0;
11123 * If it is the RXT timer we want to
11124 * stop it, so we can restart a TLP.
11126 if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
11127 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
11128 #ifdef NETFLIX_HTTP_LOGGING
11129 tcp_http_check_for_comp(rack->rc_tp, th->th_ack);
11133 * Let the congestion control algorithm update congestion control
11134 * related information. This typically means increasing the
11135 * congestion window.
11137 if (tp->snd_wnd < ctf_outstanding(tp)) {
11138 /* The peer collapsed the window */
11139 rack_collapsed_window(rack, ctf_outstanding(tp), __LINE__);
11140 } else if (rack->rc_has_collapsed)
11141 rack_un_collapse_window(rack, __LINE__);
11142 if ((rack->r_collapse_point_valid) &&
11143 (SEQ_GT(tp->snd_una, rack->r_ctl.high_collapse_point)))
11144 rack->r_collapse_point_valid = 0;
11146 * Pull snd_wl2 up to prevent seq wrap relative to th_ack.
11148 tp->snd_wl2 = th->th_ack;
11151 /* ND6_HINT(tp); *//* Some progress has been made. */
11154 * If all outstanding data are acked, stop retransmit timer,
11155 * otherwise restart timer using current (possibly backed-off)
11156 * value. If process is waiting for space, wakeup/selwakeup/signal.
11157 * If data are ready to send, let tcp_output decide between more
11158 * output or persist.
11161 if (so->so_options & SO_DEBUG)
11162 tcp_trace(TA_INPUT, ostate, tp,
11163 (void *)tcp_saveipgen,
11166 if (under_pacing &&
11167 (rack->use_fixed_rate == 0) &&
11168 (rack->in_probe_rtt == 0) &&
11169 rack->rc_gp_dyn_mul &&
11170 rack->rc_always_pace) {
11171 /* Check if we are dragging bottom */
11172 rack_check_bottom_drag(tp, rack, so, acked);
11174 if (tp->snd_una == tp->snd_max) {
11175 tp->t_flags &= ~TF_PREVVALID;
11176 rack->r_ctl.retran_during_recovery = 0;
11177 rack->r_ctl.dsack_byte_cnt = 0;
11178 rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
11179 if (rack->r_ctl.rc_went_idle_time == 0)
11180 rack->r_ctl.rc_went_idle_time = 1;
11181 rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
11182 if (sbavail(&tptosocket(tp)->so_snd) == 0)
11184 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
11186 if (acked && rack->r_fast_output)
11187 rack_gain_for_fastoutput(rack, tp, so, (uint32_t)acked);
11188 if (sbavail(&so->so_snd)) {
11189 rack->r_wanted_output = 1;
11195 * Return value of 1, the TCB is unlocked and most
11196 * likely gone, return value of 0, the TCP is still
11200 rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so,
11201 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
11202 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
11204 int32_t ret_val = 0;
11206 int32_t ourfinisacked = 0;
11207 struct tcp_rack *rack;
11209 INP_WLOCK_ASSERT(tptoinpcb(tp));
11211 ctf_calc_rwin(so, tp);
11213 * If the state is SYN_SENT: if seg contains an ACK, but not for our
11214 * SYN, drop the input. if seg contains a RST, then drop the
11215 * connection. if seg does not contain SYN, then drop it. Otherwise
11216 * this is an acceptable SYN segment initialize tp->rcv_nxt and
11217 * tp->irs if seg contains ack then advance tp->snd_una if seg
11218 * contains an ECE and ECN support is enabled, the stream is ECN
11219 * capable. if SYN has been acked change to ESTABLISHED else
11220 * SYN_RCVD state arrange for segment to be acked (eventually)
11221 * continue processing rest of data/controls.
11223 if ((thflags & TH_ACK) &&
11224 (SEQ_LEQ(th->th_ack, tp->iss) ||
11225 SEQ_GT(th->th_ack, tp->snd_max))) {
11226 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
11227 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
11230 if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) {
11231 TCP_PROBE5(connect__refused, NULL, tp,
11232 mtod(m, const char *), tp, th);
11233 tp = tcp_drop(tp, ECONNREFUSED);
11234 ctf_do_drop(m, tp);
11237 if (thflags & TH_RST) {
11238 ctf_do_drop(m, tp);
11241 if (!(thflags & TH_SYN)) {
11242 ctf_do_drop(m, tp);
11245 tp->irs = th->th_seq;
11246 tcp_rcvseqinit(tp);
11247 rack = (struct tcp_rack *)tp->t_fb_ptr;
11248 if (thflags & TH_ACK) {
11249 int tfo_partial = 0;
11251 KMOD_TCPSTAT_INC(tcps_connects);
11254 mac_socketpeer_set_from_mbuf(m, so);
11256 /* Do window scaling on this connection? */
11257 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
11258 (TF_RCVD_SCALE | TF_REQ_SCALE)) {
11259 tp->rcv_scale = tp->request_r_scale;
11261 tp->rcv_adv += min(tp->rcv_wnd,
11262 TCP_MAXWIN << tp->rcv_scale);
11264 * If not all the data that was sent in the TFO SYN
11265 * has been acked, resend the remainder right away.
11267 if (IS_FASTOPEN(tp->t_flags) &&
11268 (tp->snd_una != tp->snd_max)) {
11269 tp->snd_nxt = th->th_ack;
11273 * If there's data, delay ACK; if there's also a FIN ACKNOW
11274 * will be turned on later.
11276 if (DELAY_ACK(tp, tlen) && tlen != 0 && !tfo_partial) {
11277 rack_timer_cancel(tp, rack,
11278 rack->r_ctl.rc_rcvtime, __LINE__);
11279 tp->t_flags |= TF_DELACK;
11281 rack->r_wanted_output = 1;
11282 tp->t_flags |= TF_ACKNOW;
11283 rack->rc_dack_toggle = 0;
11286 tcp_ecn_input_syn_sent(tp, thflags, iptos);
11288 if (SEQ_GT(th->th_ack, tp->snd_una)) {
11290 * We advance snd_una for the
11291 * fast open case. If th_ack is
11292 * acknowledging data beyond
11293 * snd_una we can't just call
11294 * ack-processing since the
11295 * data stream in our send-map
11296 * will start at snd_una + 1 (one
11297 * beyond the SYN). If its just
11298 * equal we don't need to do that
11299 * and there is no send_map.
11304 * Received <SYN,ACK> in SYN_SENT[*] state. Transitions:
11305 * SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1
11307 tp->t_starttime = ticks;
11308 if (tp->t_flags & TF_NEEDFIN) {
11309 tcp_state_change(tp, TCPS_FIN_WAIT_1);
11310 tp->t_flags &= ~TF_NEEDFIN;
11311 thflags &= ~TH_SYN;
11313 tcp_state_change(tp, TCPS_ESTABLISHED);
11314 TCP_PROBE5(connect__established, NULL, tp,
11315 mtod(m, const char *), tp, th);
11316 rack_cc_conn_init(tp);
11320 * Received initial SYN in SYN-SENT[*] state => simultaneous
11321 * open. If segment contains CC option and there is a
11322 * cached CC, apply TAO test. If it succeeds, connection is *
11323 * half-synchronized. Otherwise, do 3-way handshake:
11324 * SYN-SENT -> SYN-RECEIVED SYN-SENT* -> SYN-RECEIVED* If
11325 * there was no CC option, clear cached CC value.
11327 tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN | TF_SONOTCONN);
11328 tcp_state_change(tp, TCPS_SYN_RECEIVED);
11331 * Advance th->th_seq to correspond to first data byte. If data,
11332 * trim to stay within window, dropping FIN if necessary.
11335 if (tlen > tp->rcv_wnd) {
11336 todrop = tlen - tp->rcv_wnd;
11338 tlen = tp->rcv_wnd;
11339 thflags &= ~TH_FIN;
11340 KMOD_TCPSTAT_INC(tcps_rcvpackafterwin);
11341 KMOD_TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop);
11343 tp->snd_wl1 = th->th_seq - 1;
11344 tp->rcv_up = th->th_seq;
11346 * Client side of transaction: already sent SYN and data. If the
11347 * remote host used T/TCP to validate the SYN, our data will be
11348 * ACK'd; if so, enter normal data segment processing in the middle
11349 * of step 5, ack processing. Otherwise, goto step 6.
11351 if (thflags & TH_ACK) {
11352 /* For syn-sent we need to possibly update the rtt */
11353 if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) {
11356 mcts = tcp_ts_getticks();
11357 t = (mcts - to->to_tsecr) * HPTS_USEC_IN_MSEC;
11358 if (!tp->t_rttlow || tp->t_rttlow > t)
11360 rack_log_rtt_sample_calc(rack, t, (to->to_tsecr * 1000), (mcts * 1000), 4);
11361 tcp_rack_xmit_timer(rack, t + 1, 1, t, 0, NULL, 2);
11362 tcp_rack_xmit_timer_commit(rack, tp);
11364 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val))
11366 /* We may have changed to FIN_WAIT_1 above */
11367 if (tp->t_state == TCPS_FIN_WAIT_1) {
11369 * In FIN_WAIT_1 STATE in addition to the processing
11370 * for the ESTABLISHED state if our FIN is now
11371 * acknowledged then enter FIN_WAIT_2.
11373 if (ourfinisacked) {
11375 * If we can't receive any more data, then
11376 * closing user can proceed. Starting the
11377 * timer is contrary to the specification,
11378 * but if we don't get a FIN we'll hang
11381 * XXXjl: we should release the tp also, and
11382 * use a compressed state.
11384 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
11385 soisdisconnected(so);
11386 tcp_timer_activate(tp, TT_2MSL,
11387 (tcp_fast_finwait2_recycle ?
11388 tcp_finwait2_timeout :
11391 tcp_state_change(tp, TCPS_FIN_WAIT_2);
11395 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11396 tiwin, thflags, nxt_pkt));
11400 * Return value of 1, the TCB is unlocked and most
11401 * likely gone, return value of 0, the TCP is still
11405 rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so,
11406 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
11407 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
11409 struct tcp_rack *rack;
11410 int32_t ret_val = 0;
11411 int32_t ourfinisacked = 0;
11413 ctf_calc_rwin(so, tp);
11414 if ((thflags & TH_ACK) &&
11415 (SEQ_LEQ(th->th_ack, tp->snd_una) ||
11416 SEQ_GT(th->th_ack, tp->snd_max))) {
11417 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
11418 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
11421 rack = (struct tcp_rack *)tp->t_fb_ptr;
11422 if (IS_FASTOPEN(tp->t_flags)) {
11424 * When a TFO connection is in SYN_RECEIVED, the
11425 * only valid packets are the initial SYN, a
11426 * retransmit/copy of the initial SYN (possibly with
11427 * a subset of the original data), a valid ACK, a
11430 if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) {
11431 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
11432 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
11434 } else if (thflags & TH_SYN) {
11435 /* non-initial SYN is ignored */
11436 if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT) ||
11437 (rack->r_ctl.rc_hpts_flags & PACE_TMR_TLP) ||
11438 (rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) {
11439 ctf_do_drop(m, NULL);
11442 } else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) {
11443 ctf_do_drop(m, NULL);
11448 if ((thflags & TH_RST) ||
11449 (tp->t_fin_is_rst && (thflags & TH_FIN)))
11450 return (__ctf_process_rst(m, th, so, tp,
11451 &rack->r_ctl.challenge_ack_ts,
11452 &rack->r_ctl.challenge_ack_cnt));
11454 * RFC 1323 PAWS: If we have a timestamp reply on this segment and
11455 * it's less than ts_recent, drop it.
11457 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
11458 TSTMP_LT(to->to_tsval, tp->ts_recent)) {
11459 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
11463 * In the SYN-RECEIVED state, validate that the packet belongs to
11464 * this connection before trimming the data to fit the receive
11465 * window. Check the sequence number versus IRS since we know the
11466 * sequence numbers haven't wrapped. This is a partial fix for the
11467 * "LAND" DoS attack.
11469 if (SEQ_LT(th->th_seq, tp->irs)) {
11470 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
11471 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
11474 if (_ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val,
11475 &rack->r_ctl.challenge_ack_ts,
11476 &rack->r_ctl.challenge_ack_cnt)) {
11480 * If last ACK falls within this segment's sequence numbers, record
11481 * its timestamp. NOTE: 1) That the test incorporates suggestions
11482 * from the latest proposal of the tcplw@cray.com list (Braden
11483 * 1993/04/26). 2) That updating only on newer timestamps interferes
11484 * with our earlier PAWS tests, so this check should be solely
11485 * predicated on the sequence space of this segment. 3) That we
11486 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
11487 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
11488 * SEG.Len, This modified check allows us to overcome RFC1323's
11489 * limitations as described in Stevens TCP/IP Illustrated Vol. 2
11490 * p.869. In such cases, we can still calculate the RTT correctly
11491 * when RCV.NXT == Last.ACK.Sent.
11493 if ((to->to_flags & TOF_TS) != 0 &&
11494 SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
11495 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
11496 ((thflags & (TH_SYN | TH_FIN)) != 0))) {
11497 tp->ts_recent_age = tcp_ts_getticks();
11498 tp->ts_recent = to->to_tsval;
11500 tp->snd_wnd = tiwin;
11501 rack_validate_fo_sendwin_up(tp, rack);
11503 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
11504 * is on (half-synchronized state), then queue data for later
11505 * processing; else drop segment and return.
11507 if ((thflags & TH_ACK) == 0) {
11508 if (IS_FASTOPEN(tp->t_flags)) {
11509 rack_cc_conn_init(tp);
11511 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11512 tiwin, thflags, nxt_pkt));
11514 KMOD_TCPSTAT_INC(tcps_connects);
11515 if (tp->t_flags & TF_SONOTCONN) {
11516 tp->t_flags &= ~TF_SONOTCONN;
11519 /* Do window scaling? */
11520 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
11521 (TF_RCVD_SCALE | TF_REQ_SCALE)) {
11522 tp->rcv_scale = tp->request_r_scale;
11525 * Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* ->
11528 tp->t_starttime = ticks;
11529 if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) {
11530 tcp_fastopen_decrement_counter(tp->t_tfo_pending);
11531 tp->t_tfo_pending = NULL;
11533 if (tp->t_flags & TF_NEEDFIN) {
11534 tcp_state_change(tp, TCPS_FIN_WAIT_1);
11535 tp->t_flags &= ~TF_NEEDFIN;
11537 tcp_state_change(tp, TCPS_ESTABLISHED);
11538 TCP_PROBE5(accept__established, NULL, tp,
11539 mtod(m, const char *), tp, th);
11541 * TFO connections call cc_conn_init() during SYN
11542 * processing. Calling it again here for such connections
11543 * is not harmless as it would undo the snd_cwnd reduction
11544 * that occurs when a TFO SYN|ACK is retransmitted.
11546 if (!IS_FASTOPEN(tp->t_flags))
11547 rack_cc_conn_init(tp);
11550 * Account for the ACK of our SYN prior to
11551 * regular ACK processing below, except for
11552 * simultaneous SYN, which is handled later.
11554 if (SEQ_GT(th->th_ack, tp->snd_una) && !(tp->t_flags & TF_NEEDSYN))
11557 * If segment contains data or ACK, will call tcp_reass() later; if
11558 * not, do so now to pass queued data to user.
11560 if (tlen == 0 && (thflags & TH_FIN) == 0) {
11561 (void) tcp_reass(tp, (struct tcphdr *)0, NULL, 0,
11563 if (tp->t_flags & TF_WAKESOR) {
11564 tp->t_flags &= ~TF_WAKESOR;
11565 /* NB: sorwakeup_locked() does an implicit unlock. */
11566 sorwakeup_locked(so);
11569 tp->snd_wl1 = th->th_seq - 1;
11570 /* For syn-recv we need to possibly update the rtt */
11571 if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) {
11574 mcts = tcp_ts_getticks();
11575 t = (mcts - to->to_tsecr) * HPTS_USEC_IN_MSEC;
11576 if (!tp->t_rttlow || tp->t_rttlow > t)
11578 rack_log_rtt_sample_calc(rack, t, (to->to_tsecr * 1000), (mcts * 1000), 5);
11579 tcp_rack_xmit_timer(rack, t + 1, 1, t, 0, NULL, 2);
11580 tcp_rack_xmit_timer_commit(rack, tp);
11582 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
11585 if (tp->t_state == TCPS_FIN_WAIT_1) {
11586 /* We could have went to FIN_WAIT_1 (or EST) above */
11588 * In FIN_WAIT_1 STATE in addition to the processing for the
11589 * ESTABLISHED state if our FIN is now acknowledged then
11590 * enter FIN_WAIT_2.
11592 if (ourfinisacked) {
11594 * If we can't receive any more data, then closing
11595 * user can proceed. Starting the timer is contrary
11596 * to the specification, but if we don't get a FIN
11597 * we'll hang forever.
11599 * XXXjl: we should release the tp also, and use a
11600 * compressed state.
11602 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
11603 soisdisconnected(so);
11604 tcp_timer_activate(tp, TT_2MSL,
11605 (tcp_fast_finwait2_recycle ?
11606 tcp_finwait2_timeout :
11609 tcp_state_change(tp, TCPS_FIN_WAIT_2);
11612 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11613 tiwin, thflags, nxt_pkt));
11617 * Return value of 1, the TCB is unlocked and most
11618 * likely gone, return value of 0, the TCP is still
11622 rack_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so,
11623 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
11624 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
11626 int32_t ret_val = 0;
11627 struct tcp_rack *rack;
11630 * Header prediction: check for the two common cases of a
11631 * uni-directional data xfer. If the packet has no control flags,
11632 * is in-sequence, the window didn't change and we're not
11633 * retransmitting, it's a candidate. If the length is zero and the
11634 * ack moved forward, we're the sender side of the xfer. Just free
11635 * the data acked & wake any higher level process that was blocked
11636 * waiting for space. If the length is non-zero and the ack didn't
11637 * move, we're the receiver side. If we're getting packets in-order
11638 * (the reassembly queue is empty), add the data toc The socket
11639 * buffer and note that we need a delayed ack. Make sure that the
11640 * hidden state-flags are also off. Since we check for
11641 * TCPS_ESTABLISHED first, it can only be TH_NEEDSYN.
11643 rack = (struct tcp_rack *)tp->t_fb_ptr;
11644 if (__predict_true(((to->to_flags & TOF_SACK) == 0)) &&
11645 __predict_true((thflags & (TH_SYN | TH_FIN | TH_RST | TH_ACK)) == TH_ACK) &&
11646 __predict_true(SEGQ_EMPTY(tp)) &&
11647 __predict_true(th->th_seq == tp->rcv_nxt)) {
11649 if (rack_fastack(m, th, so, tp, to, drop_hdrlen, tlen,
11650 tiwin, nxt_pkt, rack->r_ctl.rc_rcvtime)) {
11654 if (rack_do_fastnewdata(m, th, so, tp, to, drop_hdrlen, tlen,
11655 tiwin, nxt_pkt, iptos)) {
11660 ctf_calc_rwin(so, tp);
11662 if ((thflags & TH_RST) ||
11663 (tp->t_fin_is_rst && (thflags & TH_FIN)))
11664 return (__ctf_process_rst(m, th, so, tp,
11665 &rack->r_ctl.challenge_ack_ts,
11666 &rack->r_ctl.challenge_ack_cnt));
11669 * RFC5961 Section 4.2 Send challenge ACK for any SYN in
11670 * synchronized state.
11672 if (thflags & TH_SYN) {
11673 ctf_challenge_ack(m, th, tp, iptos, &ret_val);
11677 * RFC 1323 PAWS: If we have a timestamp reply on this segment and
11678 * it's less than ts_recent, drop it.
11680 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
11681 TSTMP_LT(to->to_tsval, tp->ts_recent)) {
11682 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
11685 if (_ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val,
11686 &rack->r_ctl.challenge_ack_ts,
11687 &rack->r_ctl.challenge_ack_cnt)) {
11691 * If last ACK falls within this segment's sequence numbers, record
11692 * its timestamp. NOTE: 1) That the test incorporates suggestions
11693 * from the latest proposal of the tcplw@cray.com list (Braden
11694 * 1993/04/26). 2) That updating only on newer timestamps interferes
11695 * with our earlier PAWS tests, so this check should be solely
11696 * predicated on the sequence space of this segment. 3) That we
11697 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
11698 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
11699 * SEG.Len, This modified check allows us to overcome RFC1323's
11700 * limitations as described in Stevens TCP/IP Illustrated Vol. 2
11701 * p.869. In such cases, we can still calculate the RTT correctly
11702 * when RCV.NXT == Last.ACK.Sent.
11704 if ((to->to_flags & TOF_TS) != 0 &&
11705 SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
11706 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
11707 ((thflags & (TH_SYN | TH_FIN)) != 0))) {
11708 tp->ts_recent_age = tcp_ts_getticks();
11709 tp->ts_recent = to->to_tsval;
11712 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
11713 * is on (half-synchronized state), then queue data for later
11714 * processing; else drop segment and return.
11716 if ((thflags & TH_ACK) == 0) {
11717 if (tp->t_flags & TF_NEEDSYN) {
11718 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11719 tiwin, thflags, nxt_pkt));
11721 } else if (tp->t_flags & TF_ACKNOW) {
11722 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
11723 ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
11726 ctf_do_drop(m, NULL);
11733 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) {
11736 if (sbavail(&so->so_snd)) {
11737 if (ctf_progress_timeout_check(tp, true)) {
11738 rack_log_progress_event(rack, tp, tick, PROGRESS_DROP, __LINE__);
11739 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
11743 /* State changes only happen in rack_process_data() */
11744 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11745 tiwin, thflags, nxt_pkt));
11749 * Return value of 1, the TCB is unlocked and most
11750 * likely gone, return value of 0, the TCP is still
11754 rack_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so,
11755 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
11756 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
11758 int32_t ret_val = 0;
11759 struct tcp_rack *rack;
11761 rack = (struct tcp_rack *)tp->t_fb_ptr;
11762 ctf_calc_rwin(so, tp);
11763 if ((thflags & TH_RST) ||
11764 (tp->t_fin_is_rst && (thflags & TH_FIN)))
11765 return (__ctf_process_rst(m, th, so, tp,
11766 &rack->r_ctl.challenge_ack_ts,
11767 &rack->r_ctl.challenge_ack_cnt));
11769 * RFC5961 Section 4.2 Send challenge ACK for any SYN in
11770 * synchronized state.
11772 if (thflags & TH_SYN) {
11773 ctf_challenge_ack(m, th, tp, iptos, &ret_val);
11777 * RFC 1323 PAWS: If we have a timestamp reply on this segment and
11778 * it's less than ts_recent, drop it.
11780 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
11781 TSTMP_LT(to->to_tsval, tp->ts_recent)) {
11782 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
11785 if (_ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val,
11786 &rack->r_ctl.challenge_ack_ts,
11787 &rack->r_ctl.challenge_ack_cnt)) {
11791 * If last ACK falls within this segment's sequence numbers, record
11792 * its timestamp. NOTE: 1) That the test incorporates suggestions
11793 * from the latest proposal of the tcplw@cray.com list (Braden
11794 * 1993/04/26). 2) That updating only on newer timestamps interferes
11795 * with our earlier PAWS tests, so this check should be solely
11796 * predicated on the sequence space of this segment. 3) That we
11797 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
11798 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
11799 * SEG.Len, This modified check allows us to overcome RFC1323's
11800 * limitations as described in Stevens TCP/IP Illustrated Vol. 2
11801 * p.869. In such cases, we can still calculate the RTT correctly
11802 * when RCV.NXT == Last.ACK.Sent.
11804 if ((to->to_flags & TOF_TS) != 0 &&
11805 SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
11806 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
11807 ((thflags & (TH_SYN | TH_FIN)) != 0))) {
11808 tp->ts_recent_age = tcp_ts_getticks();
11809 tp->ts_recent = to->to_tsval;
11812 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
11813 * is on (half-synchronized state), then queue data for later
11814 * processing; else drop segment and return.
11816 if ((thflags & TH_ACK) == 0) {
11817 if (tp->t_flags & TF_NEEDSYN) {
11818 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11819 tiwin, thflags, nxt_pkt));
11821 } else if (tp->t_flags & TF_ACKNOW) {
11822 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
11823 ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
11826 ctf_do_drop(m, NULL);
11833 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) {
11836 if (sbavail(&so->so_snd)) {
11837 if (ctf_progress_timeout_check(tp, true)) {
11838 rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
11839 tp, tick, PROGRESS_DROP, __LINE__);
11840 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
11844 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11845 tiwin, thflags, nxt_pkt));
11849 rack_check_data_after_close(struct mbuf *m,
11850 struct tcpcb *tp, int32_t *tlen, struct tcphdr *th, struct socket *so)
11852 struct tcp_rack *rack;
11854 rack = (struct tcp_rack *)tp->t_fb_ptr;
11855 if (rack->rc_allow_data_af_clo == 0) {
11857 tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
11858 /* tcp_close will kill the inp pre-log the Reset */
11859 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
11860 tp = tcp_close(tp);
11861 KMOD_TCPSTAT_INC(tcps_rcvafterclose);
11862 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen));
11865 if (sbavail(&so->so_snd) == 0)
11867 /* Ok we allow data that is ignored and a followup reset */
11868 tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE);
11869 tp->rcv_nxt = th->th_seq + *tlen;
11870 tp->t_flags2 |= TF2_DROP_AF_DATA;
11871 rack->r_wanted_output = 1;
11877 * Return value of 1, the TCB is unlocked and most
11878 * likely gone, return value of 0, the TCP is still
11882 rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so,
11883 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
11884 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
11886 int32_t ret_val = 0;
11887 int32_t ourfinisacked = 0;
11888 struct tcp_rack *rack;
11890 rack = (struct tcp_rack *)tp->t_fb_ptr;
11891 ctf_calc_rwin(so, tp);
11893 if ((thflags & TH_RST) ||
11894 (tp->t_fin_is_rst && (thflags & TH_FIN)))
11895 return (__ctf_process_rst(m, th, so, tp,
11896 &rack->r_ctl.challenge_ack_ts,
11897 &rack->r_ctl.challenge_ack_cnt));
11899 * RFC5961 Section 4.2 Send challenge ACK for any SYN in
11900 * synchronized state.
11902 if (thflags & TH_SYN) {
11903 ctf_challenge_ack(m, th, tp, iptos, &ret_val);
11907 * RFC 1323 PAWS: If we have a timestamp reply on this segment and
11908 * it's less than ts_recent, drop it.
11910 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
11911 TSTMP_LT(to->to_tsval, tp->ts_recent)) {
11912 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
11915 if (_ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val,
11916 &rack->r_ctl.challenge_ack_ts,
11917 &rack->r_ctl.challenge_ack_cnt)) {
11921 * If new data are received on a connection after the user processes
11922 * are gone, then RST the other end.
11924 if ((tp->t_flags & TF_CLOSED) && tlen &&
11925 rack_check_data_after_close(m, tp, &tlen, th, so))
11928 * If last ACK falls within this segment's sequence numbers, record
11929 * its timestamp. NOTE: 1) That the test incorporates suggestions
11930 * from the latest proposal of the tcplw@cray.com list (Braden
11931 * 1993/04/26). 2) That updating only on newer timestamps interferes
11932 * with our earlier PAWS tests, so this check should be solely
11933 * predicated on the sequence space of this segment. 3) That we
11934 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
11935 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
11936 * SEG.Len, This modified check allows us to overcome RFC1323's
11937 * limitations as described in Stevens TCP/IP Illustrated Vol. 2
11938 * p.869. In such cases, we can still calculate the RTT correctly
11939 * when RCV.NXT == Last.ACK.Sent.
11941 if ((to->to_flags & TOF_TS) != 0 &&
11942 SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
11943 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
11944 ((thflags & (TH_SYN | TH_FIN)) != 0))) {
11945 tp->ts_recent_age = tcp_ts_getticks();
11946 tp->ts_recent = to->to_tsval;
11949 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
11950 * is on (half-synchronized state), then queue data for later
11951 * processing; else drop segment and return.
11953 if ((thflags & TH_ACK) == 0) {
11954 if (tp->t_flags & TF_NEEDSYN) {
11955 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
11956 tiwin, thflags, nxt_pkt));
11957 } else if (tp->t_flags & TF_ACKNOW) {
11958 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
11959 ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
11962 ctf_do_drop(m, NULL);
11969 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
11972 if (ourfinisacked) {
11974 * If we can't receive any more data, then closing user can
11975 * proceed. Starting the timer is contrary to the
11976 * specification, but if we don't get a FIN we'll hang
11979 * XXXjl: we should release the tp also, and use a
11980 * compressed state.
11982 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
11983 soisdisconnected(so);
11984 tcp_timer_activate(tp, TT_2MSL,
11985 (tcp_fast_finwait2_recycle ?
11986 tcp_finwait2_timeout :
11989 tcp_state_change(tp, TCPS_FIN_WAIT_2);
11991 if (sbavail(&so->so_snd)) {
11992 if (ctf_progress_timeout_check(tp, true)) {
11993 rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
11994 tp, tick, PROGRESS_DROP, __LINE__);
11995 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
11999 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
12000 tiwin, thflags, nxt_pkt));
12004 * Return value of 1, the TCB is unlocked and most
12005 * likely gone, return value of 0, the TCP is still
12009 rack_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so,
12010 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
12011 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
12013 int32_t ret_val = 0;
12014 int32_t ourfinisacked = 0;
12015 struct tcp_rack *rack;
12017 rack = (struct tcp_rack *)tp->t_fb_ptr;
12018 ctf_calc_rwin(so, tp);
12020 if ((thflags & TH_RST) ||
12021 (tp->t_fin_is_rst && (thflags & TH_FIN)))
12022 return (__ctf_process_rst(m, th, so, tp,
12023 &rack->r_ctl.challenge_ack_ts,
12024 &rack->r_ctl.challenge_ack_cnt));
12026 * RFC5961 Section 4.2 Send challenge ACK for any SYN in
12027 * synchronized state.
12029 if (thflags & TH_SYN) {
12030 ctf_challenge_ack(m, th, tp, iptos, &ret_val);
12034 * RFC 1323 PAWS: If we have a timestamp reply on this segment and
12035 * it's less than ts_recent, drop it.
12037 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
12038 TSTMP_LT(to->to_tsval, tp->ts_recent)) {
12039 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
12042 if (_ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val,
12043 &rack->r_ctl.challenge_ack_ts,
12044 &rack->r_ctl.challenge_ack_cnt)) {
12048 * If new data are received on a connection after the user processes
12049 * are gone, then RST the other end.
12051 if ((tp->t_flags & TF_CLOSED) && tlen &&
12052 rack_check_data_after_close(m, tp, &tlen, th, so))
12055 * If last ACK falls within this segment's sequence numbers, record
12056 * its timestamp. NOTE: 1) That the test incorporates suggestions
12057 * from the latest proposal of the tcplw@cray.com list (Braden
12058 * 1993/04/26). 2) That updating only on newer timestamps interferes
12059 * with our earlier PAWS tests, so this check should be solely
12060 * predicated on the sequence space of this segment. 3) That we
12061 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
12062 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
12063 * SEG.Len, This modified check allows us to overcome RFC1323's
12064 * limitations as described in Stevens TCP/IP Illustrated Vol. 2
12065 * p.869. In such cases, we can still calculate the RTT correctly
12066 * when RCV.NXT == Last.ACK.Sent.
12068 if ((to->to_flags & TOF_TS) != 0 &&
12069 SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
12070 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
12071 ((thflags & (TH_SYN | TH_FIN)) != 0))) {
12072 tp->ts_recent_age = tcp_ts_getticks();
12073 tp->ts_recent = to->to_tsval;
12076 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
12077 * is on (half-synchronized state), then queue data for later
12078 * processing; else drop segment and return.
12080 if ((thflags & TH_ACK) == 0) {
12081 if (tp->t_flags & TF_NEEDSYN) {
12082 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
12083 tiwin, thflags, nxt_pkt));
12084 } else if (tp->t_flags & TF_ACKNOW) {
12085 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
12086 ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
12089 ctf_do_drop(m, NULL);
12096 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
12099 if (ourfinisacked) {
12104 if (sbavail(&so->so_snd)) {
12105 if (ctf_progress_timeout_check(tp, true)) {
12106 rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
12107 tp, tick, PROGRESS_DROP, __LINE__);
12108 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
12112 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
12113 tiwin, thflags, nxt_pkt));
12117 * Return value of 1, the TCB is unlocked and most
12118 * likely gone, return value of 0, the TCP is still
12122 rack_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so,
12123 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
12124 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
12126 int32_t ret_val = 0;
12127 int32_t ourfinisacked = 0;
12128 struct tcp_rack *rack;
12130 rack = (struct tcp_rack *)tp->t_fb_ptr;
12131 ctf_calc_rwin(so, tp);
12133 if ((thflags & TH_RST) ||
12134 (tp->t_fin_is_rst && (thflags & TH_FIN)))
12135 return (__ctf_process_rst(m, th, so, tp,
12136 &rack->r_ctl.challenge_ack_ts,
12137 &rack->r_ctl.challenge_ack_cnt));
12139 * RFC5961 Section 4.2 Send challenge ACK for any SYN in
12140 * synchronized state.
12142 if (thflags & TH_SYN) {
12143 ctf_challenge_ack(m, th, tp, iptos, &ret_val);
12147 * RFC 1323 PAWS: If we have a timestamp reply on this segment and
12148 * it's less than ts_recent, drop it.
12150 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
12151 TSTMP_LT(to->to_tsval, tp->ts_recent)) {
12152 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
12155 if (_ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val,
12156 &rack->r_ctl.challenge_ack_ts,
12157 &rack->r_ctl.challenge_ack_cnt)) {
12161 * If new data are received on a connection after the user processes
12162 * are gone, then RST the other end.
12164 if ((tp->t_flags & TF_CLOSED) && tlen &&
12165 rack_check_data_after_close(m, tp, &tlen, th, so))
12168 * If last ACK falls within this segment's sequence numbers, record
12169 * its timestamp. NOTE: 1) That the test incorporates suggestions
12170 * from the latest proposal of the tcplw@cray.com list (Braden
12171 * 1993/04/26). 2) That updating only on newer timestamps interferes
12172 * with our earlier PAWS tests, so this check should be solely
12173 * predicated on the sequence space of this segment. 3) That we
12174 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
12175 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
12176 * SEG.Len, This modified check allows us to overcome RFC1323's
12177 * limitations as described in Stevens TCP/IP Illustrated Vol. 2
12178 * p.869. In such cases, we can still calculate the RTT correctly
12179 * when RCV.NXT == Last.ACK.Sent.
12181 if ((to->to_flags & TOF_TS) != 0 &&
12182 SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
12183 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
12184 ((thflags & (TH_SYN | TH_FIN)) != 0))) {
12185 tp->ts_recent_age = tcp_ts_getticks();
12186 tp->ts_recent = to->to_tsval;
12189 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
12190 * is on (half-synchronized state), then queue data for later
12191 * processing; else drop segment and return.
12193 if ((thflags & TH_ACK) == 0) {
12194 if (tp->t_flags & TF_NEEDSYN) {
12195 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
12196 tiwin, thflags, nxt_pkt));
12197 } else if (tp->t_flags & TF_ACKNOW) {
12198 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
12199 ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
12202 ctf_do_drop(m, NULL);
12207 * case TCPS_LAST_ACK: Ack processing.
12209 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
12212 if (ourfinisacked) {
12213 tp = tcp_close(tp);
12214 ctf_do_drop(m, tp);
12217 if (sbavail(&so->so_snd)) {
12218 if (ctf_progress_timeout_check(tp, true)) {
12219 rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
12220 tp, tick, PROGRESS_DROP, __LINE__);
12221 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
12225 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
12226 tiwin, thflags, nxt_pkt));
12230 * Return value of 1, the TCB is unlocked and most
12231 * likely gone, return value of 0, the TCP is still
12235 rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so,
12236 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen,
12237 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos)
12239 int32_t ret_val = 0;
12240 int32_t ourfinisacked = 0;
12241 struct tcp_rack *rack;
12243 rack = (struct tcp_rack *)tp->t_fb_ptr;
12244 ctf_calc_rwin(so, tp);
12246 /* Reset receive buffer auto scaling when not in bulk receive mode. */
12247 if ((thflags & TH_RST) ||
12248 (tp->t_fin_is_rst && (thflags & TH_FIN)))
12249 return (__ctf_process_rst(m, th, so, tp,
12250 &rack->r_ctl.challenge_ack_ts,
12251 &rack->r_ctl.challenge_ack_cnt));
12253 * RFC5961 Section 4.2 Send challenge ACK for any SYN in
12254 * synchronized state.
12256 if (thflags & TH_SYN) {
12257 ctf_challenge_ack(m, th, tp, iptos, &ret_val);
12261 * RFC 1323 PAWS: If we have a timestamp reply on this segment and
12262 * it's less than ts_recent, drop it.
12264 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent &&
12265 TSTMP_LT(to->to_tsval, tp->ts_recent)) {
12266 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val))
12269 if (_ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val,
12270 &rack->r_ctl.challenge_ack_ts,
12271 &rack->r_ctl.challenge_ack_cnt)) {
12275 * If new data are received on a connection after the user processes
12276 * are gone, then RST the other end.
12278 if ((tp->t_flags & TF_CLOSED) && tlen &&
12279 rack_check_data_after_close(m, tp, &tlen, th, so))
12282 * If last ACK falls within this segment's sequence numbers, record
12283 * its timestamp. NOTE: 1) That the test incorporates suggestions
12284 * from the latest proposal of the tcplw@cray.com list (Braden
12285 * 1993/04/26). 2) That updating only on newer timestamps interferes
12286 * with our earlier PAWS tests, so this check should be solely
12287 * predicated on the sequence space of this segment. 3) That we
12288 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ
12289 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ +
12290 * SEG.Len, This modified check allows us to overcome RFC1323's
12291 * limitations as described in Stevens TCP/IP Illustrated Vol. 2
12292 * p.869. In such cases, we can still calculate the RTT correctly
12293 * when RCV.NXT == Last.ACK.Sent.
12295 if ((to->to_flags & TOF_TS) != 0 &&
12296 SEQ_LEQ(th->th_seq, tp->last_ack_sent) &&
12297 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
12298 ((thflags & (TH_SYN | TH_FIN)) != 0))) {
12299 tp->ts_recent_age = tcp_ts_getticks();
12300 tp->ts_recent = to->to_tsval;
12303 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag
12304 * is on (half-synchronized state), then queue data for later
12305 * processing; else drop segment and return.
12307 if ((thflags & TH_ACK) == 0) {
12308 if (tp->t_flags & TF_NEEDSYN) {
12309 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
12310 tiwin, thflags, nxt_pkt));
12311 } else if (tp->t_flags & TF_ACKNOW) {
12312 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val);
12313 ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output = 1;
12316 ctf_do_drop(m, NULL);
12323 if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) {
12326 if (sbavail(&so->so_snd)) {
12327 if (ctf_progress_timeout_check(tp, true)) {
12328 rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
12329 tp, tick, PROGRESS_DROP, __LINE__);
12330 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
12334 return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen,
12335 tiwin, thflags, nxt_pkt));
12339 rack_clear_rate_sample(struct tcp_rack *rack)
12341 rack->r_ctl.rack_rs.rs_flags = RACK_RTT_EMPTY;
12342 rack->r_ctl.rack_rs.rs_rtt_cnt = 0;
12343 rack->r_ctl.rack_rs.rs_rtt_tot = 0;
12347 rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack, uint32_t line, uint64_t *fill_override)
12349 uint64_t bw_est, rate_wanted;
12351 uint32_t user_max, orig_min, orig_max;
12353 orig_min = rack->r_ctl.rc_pace_min_segs;
12354 orig_max = rack->r_ctl.rc_pace_max_segs;
12355 user_max = ctf_fixed_maxseg(tp) * rack->rc_user_set_max_segs;
12356 if (ctf_fixed_maxseg(tp) != rack->r_ctl.rc_pace_min_segs)
12358 rack->r_ctl.rc_pace_min_segs = ctf_fixed_maxseg(tp);
12359 if (rack->use_fixed_rate || rack->rc_force_max_seg) {
12360 if (user_max != rack->r_ctl.rc_pace_max_segs)
12363 if (rack->rc_force_max_seg) {
12364 rack->r_ctl.rc_pace_max_segs = user_max;
12365 } else if (rack->use_fixed_rate) {
12366 bw_est = rack_get_bw(rack);
12367 if ((rack->r_ctl.crte == NULL) ||
12368 (bw_est != rack->r_ctl.crte->rate)) {
12369 rack->r_ctl.rc_pace_max_segs = user_max;
12371 /* We are pacing right at the hardware rate */
12374 segsiz = min(ctf_fixed_maxseg(tp),
12375 rack->r_ctl.rc_pace_min_segs);
12376 rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size(
12377 tp, bw_est, segsiz, 0,
12378 rack->r_ctl.crte, NULL);
12380 } else if (rack->rc_always_pace) {
12381 if (rack->r_ctl.gp_bw ||
12382 #ifdef NETFLIX_PEAKRATE
12383 rack->rc_tp->t_maxpeakrate ||
12385 rack->r_ctl.init_rate) {
12386 /* We have a rate of some sort set */
12389 bw_est = rack_get_bw(rack);
12390 orig = rack->r_ctl.rc_pace_max_segs;
12392 rate_wanted = *fill_override;
12394 rate_wanted = rack_get_output_bw(rack, bw_est, NULL, NULL);
12396 /* We have something */
12397 rack->r_ctl.rc_pace_max_segs = rack_get_pacing_len(rack,
12399 ctf_fixed_maxseg(rack->rc_tp));
12401 rack->r_ctl.rc_pace_max_segs = rack->r_ctl.rc_pace_min_segs;
12402 if (orig != rack->r_ctl.rc_pace_max_segs)
12404 } else if ((rack->r_ctl.gp_bw == 0) &&
12405 (rack->r_ctl.rc_pace_max_segs == 0)) {
12407 * If we have nothing limit us to bursting
12408 * out IW sized pieces.
12411 rack->r_ctl.rc_pace_max_segs = rc_init_window(rack);
12414 if (rack->r_ctl.rc_pace_max_segs > PACE_MAX_IP_BYTES) {
12416 rack->r_ctl.rc_pace_max_segs = PACE_MAX_IP_BYTES;
12419 rack_log_type_pacing_sizes(tp, rack, orig_min, orig_max, line, 2);
12424 rack_init_fsb_block(struct tcpcb *tp, struct tcp_rack *rack)
12427 struct ip6_hdr *ip6 = NULL;
12430 struct ip *ip = NULL;
12432 struct udphdr *udp = NULL;
12434 /* Ok lets fill in the fast block, it can only be used with no IP options! */
12436 if (rack->r_is_v6) {
12437 rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
12438 ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
12440 rack->r_ctl.fsb.tcp_ip_hdr_len += sizeof(struct udphdr);
12441 udp = (struct udphdr *)((caddr_t)ip6 + sizeof(struct ip6_hdr));
12442 udp->uh_sport = htons(V_tcp_udp_tunneling_port);
12443 udp->uh_dport = tp->t_port;
12444 rack->r_ctl.fsb.udp = udp;
12445 rack->r_ctl.fsb.th = (struct tcphdr *)(udp + 1);
12448 rack->r_ctl.fsb.th = (struct tcphdr *)(ip6 + 1);
12449 rack->r_ctl.fsb.udp = NULL;
12451 tcpip_fillheaders(rack->rc_inp,
12453 ip6, rack->r_ctl.fsb.th);
12457 rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct tcpiphdr);
12458 ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
12460 rack->r_ctl.fsb.tcp_ip_hdr_len += sizeof(struct udphdr);
12461 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
12462 udp->uh_sport = htons(V_tcp_udp_tunneling_port);
12463 udp->uh_dport = tp->t_port;
12464 rack->r_ctl.fsb.udp = udp;
12465 rack->r_ctl.fsb.th = (struct tcphdr *)(udp + 1);
12468 rack->r_ctl.fsb.udp = NULL;
12469 rack->r_ctl.fsb.th = (struct tcphdr *)(ip + 1);
12471 tcpip_fillheaders(rack->rc_inp,
12473 ip, rack->r_ctl.fsb.th);
12475 rack->r_fsb_inited = 1;
12479 rack_init_fsb(struct tcpcb *tp, struct tcp_rack *rack)
12482 * Allocate the larger of spaces V6 if available else just
12483 * V4 and include udphdr (overbook)
12486 rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct ip6_hdr) + sizeof(struct tcphdr) + sizeof(struct udphdr);
12488 rack->r_ctl.fsb.tcp_ip_hdr_len = sizeof(struct tcpiphdr) + sizeof(struct udphdr);
12490 rack->r_ctl.fsb.tcp_ip_hdr = malloc(rack->r_ctl.fsb.tcp_ip_hdr_len,
12491 M_TCPFSB, M_NOWAIT|M_ZERO);
12492 if (rack->r_ctl.fsb.tcp_ip_hdr == NULL) {
12495 rack->r_fsb_inited = 0;
12500 rack_init(struct tcpcb *tp)
12502 struct inpcb *inp = tptoinpcb(tp);
12503 struct tcp_rack *rack = NULL;
12505 struct rack_sendmap *insret;
12507 uint32_t iwin, snt, us_cts;
12510 tp->t_fb_ptr = uma_zalloc(rack_pcb_zone, M_NOWAIT);
12511 if (tp->t_fb_ptr == NULL) {
12513 * We need to allocate memory but cant. The INP and INP_INFO
12514 * locks and they are recursive (happens during setup. So a
12515 * scheme to drop the locks fails :(
12520 memset(tp->t_fb_ptr, 0, sizeof(struct tcp_rack));
12522 rack = (struct tcp_rack *)tp->t_fb_ptr;
12523 RB_INIT(&rack->r_ctl.rc_mtree);
12524 TAILQ_INIT(&rack->r_ctl.rc_free);
12525 TAILQ_INIT(&rack->r_ctl.rc_tmap);
12527 rack->rc_inp = inp;
12529 rack->r_is_v6 = (inp->inp_vflag & INP_IPV6) != 0;
12530 /* Probably not needed but lets be sure */
12531 rack_clear_rate_sample(rack);
12533 * Save off the default values, socket options will poke
12534 * at these if pacing is not on or we have not yet
12535 * reached where pacing is on (gp_ready/fixed enabled).
12536 * When they get set into the CC module (when gp_ready
12537 * is enabled or we enable fixed) then we will set these
12538 * values into the CC and place in here the old values
12539 * so we have a restoral. Then we will set the flag
12540 * rc_pacing_cc_set. That way whenever we turn off pacing
12541 * or switch off this stack, we will know to go restore
12542 * the saved values.
12544 rack->r_ctl.rc_saved_beta.beta = V_newreno_beta_ecn;
12545 rack->r_ctl.rc_saved_beta.beta_ecn = V_newreno_beta_ecn;
12546 /* We want abe like behavior as well */
12547 rack->r_ctl.rc_saved_beta.newreno_flags |= CC_NEWRENO_BETA_ECN_ENABLED;
12548 rack->r_ctl.rc_reorder_fade = rack_reorder_fade;
12549 rack->rc_allow_data_af_clo = rack_ignore_data_after_close;
12550 rack->r_ctl.rc_tlp_threshold = rack_tlp_thresh;
12551 rack->r_ctl.roundends = tp->snd_max;
12553 rack->use_rack_rr = 1;
12554 if (V_tcp_delack_enabled)
12555 tp->t_delayed_ack = 1;
12557 tp->t_delayed_ack = 0;
12558 #ifdef TCP_ACCOUNTING
12559 if (rack_tcp_accounting) {
12560 tp->t_flags2 |= TF2_TCP_ACCOUNTING;
12563 if (rack_enable_shared_cwnd)
12564 rack->rack_enable_scwnd = 1;
12565 rack->rc_user_set_max_segs = rack_hptsi_segments;
12566 rack->rc_force_max_seg = 0;
12567 if (rack_use_imac_dack)
12568 rack->rc_dack_mode = 1;
12569 TAILQ_INIT(&rack->r_ctl.opt_list);
12570 rack->r_ctl.rc_reorder_shift = rack_reorder_thresh;
12571 rack->r_ctl.rc_pkt_delay = rack_pkt_delay;
12572 rack->r_ctl.rc_tlp_cwnd_reduce = rack_lower_cwnd_at_tlp;
12573 rack->r_ctl.rc_lowest_us_rtt = 0xffffffff;
12574 rack->r_ctl.rc_highest_us_rtt = 0;
12575 rack->r_ctl.bw_rate_cap = rack_bw_rate_cap;
12576 rack->r_ctl.timer_slop = TICKS_2_USEC(tcp_rexmit_slop);
12577 if (rack_use_cmp_acks)
12578 rack->r_use_cmp_ack = 1;
12579 if (rack_disable_prr)
12580 rack->rack_no_prr = 1;
12581 if (rack_gp_no_rec_chg)
12582 rack->rc_gp_no_rec_chg = 1;
12583 if (rack_pace_every_seg && tcp_can_enable_pacing()) {
12584 rack->rc_always_pace = 1;
12585 if (rack->use_fixed_rate || rack->gp_ready)
12586 rack_set_cc_pacing(rack);
12588 rack->rc_always_pace = 0;
12589 if (rack_enable_mqueue_for_nonpaced || rack->r_use_cmp_ack)
12590 rack->r_mbuf_queue = 1;
12592 rack->r_mbuf_queue = 0;
12593 if (rack->r_mbuf_queue || rack->rc_always_pace || rack->r_use_cmp_ack)
12594 inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
12596 inp->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
12597 rack_set_pace_segments(tp, rack, __LINE__, NULL);
12598 if (rack_limits_scwnd)
12599 rack->r_limit_scw = 1;
12601 rack->r_limit_scw = 0;
12602 rack->rc_labc = V_tcp_abc_l_var;
12603 rack->r_ctl.rc_high_rwnd = tp->snd_wnd;
12604 rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
12605 rack->r_ctl.rc_rate_sample_method = rack_rate_sample_method;
12606 rack->rack_tlp_threshold_use = rack_tlp_threshold_use;
12607 rack->r_ctl.rc_prr_sendalot = rack_send_a_lot_in_prr;
12608 rack->r_ctl.rc_min_to = rack_min_to;
12609 microuptime(&rack->r_ctl.act_rcv_time);
12610 rack->r_ctl.rc_last_time_decay = rack->r_ctl.act_rcv_time;
12611 rack->rc_init_win = rack_default_init_window;
12612 rack->r_ctl.rack_per_of_gp_ss = rack_per_of_gp_ss;
12613 if (rack_hw_up_only)
12614 rack->r_up_only = 1;
12615 if (rack_do_dyn_mul) {
12616 /* When dynamic adjustment is on CA needs to start at 100% */
12617 rack->rc_gp_dyn_mul = 1;
12618 if (rack_do_dyn_mul >= 100)
12619 rack->r_ctl.rack_per_of_gp_ca = rack_do_dyn_mul;
12621 rack->r_ctl.rack_per_of_gp_ca = rack_per_of_gp_ca;
12622 rack->r_ctl.rack_per_of_gp_rec = rack_per_of_gp_rec;
12623 rack->r_ctl.rack_per_of_gp_probertt = rack_per_of_gp_probertt;
12624 rack->r_ctl.rc_tlp_rxt_last_time = tcp_tv_to_mssectick(&rack->r_ctl.act_rcv_time);
12625 setup_time_filter_small(&rack->r_ctl.rc_gp_min_rtt, FILTER_TYPE_MIN,
12626 rack_probertt_filter_life);
12627 us_cts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
12628 rack->r_ctl.rc_lower_rtt_us_cts = us_cts;
12629 rack->r_ctl.rc_time_of_last_probertt = us_cts;
12630 rack->r_ctl.challenge_ack_ts = tcp_ts_getticks();
12631 rack->r_ctl.rc_time_probertt_starts = 0;
12632 if (rack_dsack_std_based & 0x1) {
12633 /* Basically this means all rack timers are at least (srtt + 1/4 srtt) */
12634 rack->rc_rack_tmr_std_based = 1;
12636 if (rack_dsack_std_based & 0x2) {
12637 /* Basically this means rack timers are extended based on dsack by up to (2 * srtt) */
12638 rack->rc_rack_use_dsack = 1;
12640 /* We require at least one measurement, even if the sysctl is 0 */
12641 if (rack_req_measurements)
12642 rack->r_ctl.req_measurements = rack_req_measurements;
12644 rack->r_ctl.req_measurements = 1;
12645 if (rack_enable_hw_pacing)
12646 rack->rack_hdw_pace_ena = 1;
12647 if (rack_hw_rate_caps)
12648 rack->r_rack_hw_rate_caps = 1;
12649 /* Do we force on detection? */
12650 #ifdef NETFLIX_EXP_DETECTION
12651 if (tcp_force_detection)
12652 rack->do_detection = 1;
12655 rack->do_detection = 0;
12656 if (rack_non_rxt_use_cr)
12657 rack->rack_rec_nonrxt_use_cr = 1;
12658 err = rack_init_fsb(tp, rack);
12660 uma_zfree(rack_pcb_zone, tp->t_fb_ptr);
12661 tp->t_fb_ptr = NULL;
12664 if (tp->snd_una != tp->snd_max) {
12665 /* Create a send map for the current outstanding data */
12666 struct rack_sendmap *rsm;
12668 rsm = rack_alloc(rack);
12670 uma_zfree(rack_pcb_zone, tp->t_fb_ptr);
12671 tp->t_fb_ptr = NULL;
12674 rsm->r_no_rtt_allowed = 1;
12675 rsm->r_tim_lastsent[0] = rack_to_usec_ts(&rack->r_ctl.act_rcv_time);
12676 rsm->r_rtr_cnt = 1;
12677 rsm->r_rtr_bytes = 0;
12678 if (tp->t_flags & TF_SENTFIN)
12679 rsm->r_flags |= RACK_HAS_FIN;
12680 if ((tp->snd_una == tp->iss) &&
12681 !TCPS_HAVEESTABLISHED(tp->t_state))
12682 rsm->r_flags |= RACK_HAS_SYN;
12683 rsm->r_start = tp->snd_una;
12684 rsm->r_end = tp->snd_max;
12686 if (rack->rc_inp->inp_socket->so_snd.sb_mb != NULL) {
12687 rsm->m = sbsndmbuf(&rack->rc_inp->inp_socket->so_snd, 0, &rsm->soff);
12689 rsm->orig_m_len = rsm->m->m_len;
12691 rsm->orig_m_len = 0;
12694 * This can happen if we have a stand-alone FIN or
12698 rsm->orig_m_len = 0;
12702 (void)RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
12704 insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
12705 if (insret != NULL) {
12706 panic("Insert in rb tree fails ret:%p rack:%p rsm:%p",
12707 insret, rack, rsm);
12710 TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext);
12711 rsm->r_in_tmap = 1;
12714 * Timers in Rack are kept in microseconds so lets
12715 * convert any initial incoming variables
12716 * from ticks into usecs. Note that we
12717 * also change the values of t_srtt and t_rttvar, if
12718 * they are non-zero. They are kept with a 5
12719 * bit decimal so we have to carefully convert
12720 * these to get the full precision.
12722 rack_convert_rtts(tp);
12723 tp->t_rttlow = TICKS_2_USEC(tp->t_rttlow);
12724 if (rack_do_hystart) {
12725 tp->t_ccv.flags |= CCF_HYSTART_ALLOWED;
12726 if (rack_do_hystart > 1)
12727 tp->t_ccv.flags |= CCF_HYSTART_CAN_SH_CWND;
12728 if (rack_do_hystart > 2)
12729 tp->t_ccv.flags |= CCF_HYSTART_CONS_SSTH;
12731 if (rack_def_profile)
12732 rack_set_profile(rack, rack_def_profile);
12733 /* Cancel the GP measurement in progress */
12734 tp->t_flags &= ~TF_GPUTINPROG;
12735 if (SEQ_GT(tp->snd_max, tp->iss))
12736 snt = tp->snd_max - tp->iss;
12739 iwin = rc_init_window(rack);
12741 /* We are not past the initial window
12742 * so we need to make sure cwnd is
12745 if (tp->snd_cwnd < iwin)
12746 tp->snd_cwnd = iwin;
12748 * If we are within the initial window
12749 * we want ssthresh to be unlimited. Setting
12750 * it to the rwnd (which the default stack does
12751 * and older racks) is not really a good idea
12752 * since we want to be in SS and grow both the
12753 * cwnd and the rwnd (via dynamic rwnd growth). If
12754 * we set it to the rwnd then as the peer grows its
12755 * rwnd we will be stuck in CA and never hit SS.
12757 * Its far better to raise it up high (this takes the
12758 * risk that there as been a loss already, probably
12759 * we should have an indicator in all stacks of loss
12760 * but we don't), but considering the normal use this
12761 * is a risk worth taking. The consequences of not
12762 * hitting SS are far worse than going one more time
12763 * into it early on (before we have sent even a IW).
12764 * It is highly unlikely that we will have had a loss
12765 * before getting the IW out.
12767 tp->snd_ssthresh = 0xffffffff;
12769 rack_stop_all_timers(tp);
12770 /* Lets setup the fsb block */
12771 rack_start_hpts_timer(rack, tp, tcp_get_usecs(NULL), 0, 0, 0);
12772 rack_log_rtt_shrinks(rack, us_cts, tp->t_rxtcur,
12773 __LINE__, RACK_RTTS_INIT);
12778 rack_handoff_ok(struct tcpcb *tp)
12780 if ((tp->t_state == TCPS_CLOSED) ||
12781 (tp->t_state == TCPS_LISTEN)) {
12782 /* Sure no problem though it may not stick */
12785 if ((tp->t_state == TCPS_SYN_SENT) ||
12786 (tp->t_state == TCPS_SYN_RECEIVED)) {
12788 * We really don't know if you support sack,
12789 * you have to get to ESTAB or beyond to tell.
12793 if ((tp->t_flags & TF_SENTFIN) && ((tp->snd_max - tp->snd_una) > 1)) {
12795 * Rack will only send a FIN after all data is acknowledged.
12796 * So in this case we have more data outstanding. We can't
12797 * switch stacks until either all data and only the FIN
12798 * is left (in which case rack_init() now knows how
12799 * to deal with that) <or> all is acknowledged and we
12800 * are only left with incoming data, though why you
12801 * would want to switch to rack after all data is acknowledged
12802 * I have no idea (rrs)!
12806 if ((tp->t_flags & TF_SACK_PERMIT) || rack_sack_not_required){
12810 * If we reach here we don't do SACK on this connection so we can
12818 rack_fini(struct tcpcb *tp, int32_t tcb_is_purged)
12820 struct inpcb *inp = tptoinpcb(tp);
12822 if (tp->t_fb_ptr) {
12823 struct tcp_rack *rack;
12824 struct rack_sendmap *rsm, *nrsm;
12826 struct rack_sendmap *rm;
12829 rack = (struct tcp_rack *)tp->t_fb_ptr;
12830 if (tp->t_in_pkt) {
12832 * It is unsafe to process the packets since a
12833 * reset may be lurking in them (its rare but it
12834 * can occur). If we were to find a RST, then we
12835 * would end up dropping the connection and the
12836 * INP lock, so when we return the caller (tcp_usrreq)
12837 * will blow up when it trys to unlock the inp.
12839 struct mbuf *save, *m;
12842 tp->t_in_pkt = NULL;
12843 tp->t_tail_pkt = NULL;
12845 save = m->m_nextpkt;
12846 m->m_nextpkt = NULL;
12851 tp->t_flags &= ~TF_FORCEDATA;
12852 #ifdef NETFLIX_SHARED_CWND
12853 if (rack->r_ctl.rc_scw) {
12856 if (rack->r_limit_scw)
12857 limit = max(1, rack->r_ctl.rc_lowest_us_rtt);
12860 tcp_shared_cwnd_free_full(tp, rack->r_ctl.rc_scw,
12861 rack->r_ctl.rc_scw_index,
12863 rack->r_ctl.rc_scw = NULL;
12866 if (rack->r_ctl.fsb.tcp_ip_hdr) {
12867 free(rack->r_ctl.fsb.tcp_ip_hdr, M_TCPFSB);
12868 rack->r_ctl.fsb.tcp_ip_hdr = NULL;
12869 rack->r_ctl.fsb.th = NULL;
12871 /* Convert back to ticks, with */
12872 if (tp->t_srtt > 1) {
12873 uint32_t val, frac;
12875 val = USEC_2_TICKS(tp->t_srtt);
12876 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz);
12877 tp->t_srtt = val << TCP_RTT_SHIFT;
12879 * frac is the fractional part here is left
12880 * over from converting to hz and shifting.
12881 * We need to convert this to the 5 bit
12886 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC);
12888 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC);
12890 tp->t_srtt += frac;
12893 if (tp->t_rttvar) {
12894 uint32_t val, frac;
12896 val = USEC_2_TICKS(tp->t_rttvar);
12897 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz);
12898 tp->t_rttvar = val << TCP_RTTVAR_SHIFT;
12900 * frac is the fractional part here is left
12901 * over from converting to hz and shifting.
12902 * We need to convert this to the 5 bit
12907 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC);
12909 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC);
12911 tp->t_rttvar += frac;
12914 tp->t_rxtcur = USEC_2_TICKS(tp->t_rxtcur);
12915 tp->t_rttlow = USEC_2_TICKS(tp->t_rttlow);
12916 if (rack->rc_always_pace) {
12917 tcp_decrement_paced_conn();
12918 rack_undo_cc_pacing(rack);
12919 rack->rc_always_pace = 0;
12921 /* Clean up any options if they were not applied */
12922 while (!TAILQ_EMPTY(&rack->r_ctl.opt_list)) {
12923 struct deferred_opt_list *dol;
12925 dol = TAILQ_FIRST(&rack->r_ctl.opt_list);
12926 TAILQ_REMOVE(&rack->r_ctl.opt_list, dol, next);
12927 free(dol, M_TCPDO);
12929 /* rack does not use force data but other stacks may clear it */
12930 if (rack->r_ctl.crte != NULL) {
12931 tcp_rel_pacing_rate(rack->r_ctl.crte, tp);
12932 rack->rack_hdrw_pacing = 0;
12933 rack->r_ctl.crte = NULL;
12935 #ifdef TCP_BLACKBOX
12936 tcp_log_flowend(tp);
12938 RB_FOREACH_SAFE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm) {
12940 (void)RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
12942 rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm);
12944 panic("At fini, rack:%p rsm:%p rm:%p",
12948 uma_zfree(rack_zone, rsm);
12950 rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
12952 TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext);
12953 uma_zfree(rack_zone, rsm);
12954 rsm = TAILQ_FIRST(&rack->r_ctl.rc_free);
12956 rack->rc_free_cnt = 0;
12957 uma_zfree(rack_pcb_zone, tp->t_fb_ptr);
12958 tp->t_fb_ptr = NULL;
12960 inp->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
12961 inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY;
12962 inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE;
12963 inp->inp_flags2 &= ~INP_MBUF_ACKCMP;
12964 /* Cancel the GP measurement in progress */
12965 tp->t_flags &= ~TF_GPUTINPROG;
12966 inp->inp_flags2 &= ~INP_MBUF_L_ACKS;
12967 /* Make sure snd_nxt is correctly set */
12968 tp->snd_nxt = tp->snd_max;
12972 rack_set_state(struct tcpcb *tp, struct tcp_rack *rack)
12974 if ((rack->r_state == TCPS_CLOSED) && (tp->t_state != TCPS_CLOSED)) {
12975 rack->r_is_v6 = (tptoinpcb(tp)->inp_vflag & INP_IPV6) != 0;
12977 switch (tp->t_state) {
12978 case TCPS_SYN_SENT:
12979 rack->r_state = TCPS_SYN_SENT;
12980 rack->r_substate = rack_do_syn_sent;
12982 case TCPS_SYN_RECEIVED:
12983 rack->r_state = TCPS_SYN_RECEIVED;
12984 rack->r_substate = rack_do_syn_recv;
12986 case TCPS_ESTABLISHED:
12987 rack_set_pace_segments(tp, rack, __LINE__, NULL);
12988 rack->r_state = TCPS_ESTABLISHED;
12989 rack->r_substate = rack_do_established;
12991 case TCPS_CLOSE_WAIT:
12992 rack_set_pace_segments(tp, rack, __LINE__, NULL);
12993 rack->r_state = TCPS_CLOSE_WAIT;
12994 rack->r_substate = rack_do_close_wait;
12996 case TCPS_FIN_WAIT_1:
12997 rack_set_pace_segments(tp, rack, __LINE__, NULL);
12998 rack->r_state = TCPS_FIN_WAIT_1;
12999 rack->r_substate = rack_do_fin_wait_1;
13002 rack_set_pace_segments(tp, rack, __LINE__, NULL);
13003 rack->r_state = TCPS_CLOSING;
13004 rack->r_substate = rack_do_closing;
13006 case TCPS_LAST_ACK:
13007 rack_set_pace_segments(tp, rack, __LINE__, NULL);
13008 rack->r_state = TCPS_LAST_ACK;
13009 rack->r_substate = rack_do_lastack;
13011 case TCPS_FIN_WAIT_2:
13012 rack_set_pace_segments(tp, rack, __LINE__, NULL);
13013 rack->r_state = TCPS_FIN_WAIT_2;
13014 rack->r_substate = rack_do_fin_wait_2;
13018 case TCPS_TIME_WAIT:
13022 if (rack->r_use_cmp_ack && TCPS_HAVEESTABLISHED(tp->t_state))
13023 rack->rc_inp->inp_flags2 |= INP_MBUF_ACKCMP;
13028 rack_timer_audit(struct tcpcb *tp, struct tcp_rack *rack, struct sockbuf *sb)
13031 * We received an ack, and then did not
13032 * call send or were bounced out due to the
13033 * hpts was running. Now a timer is up as well, is
13034 * it the right timer?
13036 struct rack_sendmap *rsm;
13039 tmr_up = rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK;
13040 if (rack->rc_in_persist && (tmr_up == PACE_TMR_PERSIT))
13042 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
13043 if (((rsm == NULL) || (tp->t_state < TCPS_ESTABLISHED)) &&
13044 (tmr_up == PACE_TMR_RXT)) {
13045 /* Should be an RXT */
13049 /* Nothing outstanding? */
13050 if (tp->t_flags & TF_DELACK) {
13051 if (tmr_up == PACE_TMR_DELACK)
13052 /* We are supposed to have delayed ack up and we do */
13054 } else if (sbavail(&tptosocket(tp)->so_snd) && (tmr_up == PACE_TMR_RXT)) {
13056 * if we hit enobufs then we would expect the possibility
13057 * of nothing outstanding and the RXT up (and the hptsi timer).
13060 } else if (((V_tcp_always_keepalive ||
13061 rack->rc_inp->inp_socket->so_options & SO_KEEPALIVE) &&
13062 (tp->t_state <= TCPS_CLOSING)) &&
13063 (tmr_up == PACE_TMR_KEEP) &&
13064 (tp->snd_max == tp->snd_una)) {
13065 /* We should have keep alive up and we do */
13069 if (SEQ_GT(tp->snd_max, tp->snd_una) &&
13070 ((tmr_up == PACE_TMR_TLP) ||
13071 (tmr_up == PACE_TMR_RACK) ||
13072 (tmr_up == PACE_TMR_RXT))) {
13074 * Either a Rack, TLP or RXT is fine if we
13075 * have outstanding data.
13078 } else if (tmr_up == PACE_TMR_DELACK) {
13080 * If the delayed ack was going to go off
13081 * before the rtx/tlp/rack timer were going to
13082 * expire, then that would be the timer in control.
13083 * Note we don't check the time here trusting the
13089 * Ok the timer originally started is not what we want now.
13090 * We will force the hpts to be stopped if any, and restart
13091 * with the slot set to what was in the saved slot.
13093 if (tcp_in_hpts(rack->rc_inp)) {
13094 if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
13097 us_cts = tcp_get_usecs(NULL);
13098 if (TSTMP_GT(rack->r_ctl.rc_last_output_to, us_cts)) {
13100 rack->r_ctl.rc_agg_early += (rack->r_ctl.rc_last_output_to - us_cts);
13102 rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
13104 tcp_hpts_remove(rack->rc_inp);
13106 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
13107 rack_start_hpts_timer(rack, tp, tcp_get_usecs(NULL), 0, 0, 0);
13112 rack_do_win_updates(struct tcpcb *tp, struct tcp_rack *rack, uint32_t tiwin, uint32_t seq, uint32_t ack, uint32_t cts, uint32_t high_seq)
13114 if ((SEQ_LT(tp->snd_wl1, seq) ||
13115 (tp->snd_wl1 == seq && (SEQ_LT(tp->snd_wl2, ack) ||
13116 (tp->snd_wl2 == ack && tiwin > tp->snd_wnd))))) {
13117 /* keep track of pure window updates */
13118 if ((tp->snd_wl2 == ack) && (tiwin > tp->snd_wnd))
13119 KMOD_TCPSTAT_INC(tcps_rcvwinupd);
13120 tp->snd_wnd = tiwin;
13121 rack_validate_fo_sendwin_up(tp, rack);
13124 if (tp->snd_wnd > tp->max_sndwnd)
13125 tp->max_sndwnd = tp->snd_wnd;
13126 rack->r_wanted_output = 1;
13127 } else if ((tp->snd_wl2 == ack) && (tiwin < tp->snd_wnd)) {
13128 tp->snd_wnd = tiwin;
13129 rack_validate_fo_sendwin_up(tp, rack);
13133 /* Not a valid win update */
13136 /* Do we exit persists? */
13137 if ((rack->rc_in_persist != 0) &&
13138 (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2),
13139 rack->r_ctl.rc_pace_min_segs))) {
13140 rack_exit_persist(tp, rack, cts);
13142 /* Do we enter persists? */
13143 if ((rack->rc_in_persist == 0) &&
13144 (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) &&
13145 TCPS_HAVEESTABLISHED(tp->t_state) &&
13146 ((tp->snd_max == tp->snd_una) || rack->rc_has_collapsed) &&
13147 sbavail(&tptosocket(tp)->so_snd) &&
13148 (sbavail(&tptosocket(tp)->so_snd) > tp->snd_wnd)) {
13150 * Here the rwnd is less than
13151 * the pacing size, we are established,
13152 * nothing is outstanding, and there is
13153 * data to send. Enter persists.
13155 rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime);
13160 rack_log_input_packet(struct tcpcb *tp, struct tcp_rack *rack, struct tcp_ackent *ae, int ackval, uint32_t high_seq)
13163 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
13164 struct inpcb *inp = tptoinpcb(tp);
13165 union tcp_log_stackspecific log;
13166 struct timeval ltv;
13167 char tcp_hdr_buf[60];
13169 struct timespec ts;
13170 uint32_t orig_snd_una;
13173 #ifdef NETFLIX_HTTP_LOGGING
13174 struct http_sendfile_track *http_req;
13176 if (SEQ_GT(ae->ack, tp->snd_una)) {
13177 http_req = tcp_http_find_req_for_seq(tp, (ae->ack-1));
13179 http_req = tcp_http_find_req_for_seq(tp, ae->ack);
13182 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
13183 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
13184 if (rack->rack_no_prr == 0)
13185 log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
13187 log.u_bbr.flex1 = 0;
13188 log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
13189 log.u_bbr.use_lt_bw <<= 1;
13190 log.u_bbr.use_lt_bw |= rack->r_might_revert;
13191 log.u_bbr.flex2 = rack->r_ctl.rc_num_maps_alloced;
13192 log.u_bbr.inflight = ctf_flight_size(tp, rack->r_ctl.rc_sacked);
13193 log.u_bbr.pkts_out = tp->t_maxseg;
13194 log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
13195 log.u_bbr.flex7 = 1;
13196 log.u_bbr.lost = ae->flags;
13197 log.u_bbr.cwnd_gain = ackval;
13198 log.u_bbr.pacing_gain = 0x2;
13199 if (ae->flags & TSTMP_HDWR) {
13200 /* Record the hardware timestamp if present */
13201 log.u_bbr.flex3 = M_TSTMP;
13202 ts.tv_sec = ae->timestamp / 1000000000;
13203 ts.tv_nsec = ae->timestamp % 1000000000;
13204 ltv.tv_sec = ts.tv_sec;
13205 ltv.tv_usec = ts.tv_nsec / 1000;
13206 log.u_bbr.lt_epoch = tcp_tv_to_usectick(<v);
13207 } else if (ae->flags & TSTMP_LRO) {
13208 /* Record the LRO the arrival timestamp */
13209 log.u_bbr.flex3 = M_TSTMP_LRO;
13210 ts.tv_sec = ae->timestamp / 1000000000;
13211 ts.tv_nsec = ae->timestamp % 1000000000;
13212 ltv.tv_sec = ts.tv_sec;
13213 ltv.tv_usec = ts.tv_nsec / 1000;
13214 log.u_bbr.flex5 = tcp_tv_to_usectick(<v);
13216 log.u_bbr.timeStamp = tcp_get_usecs(<v);
13217 /* Log the rcv time */
13218 log.u_bbr.delRate = ae->timestamp;
13219 #ifdef NETFLIX_HTTP_LOGGING
13220 log.u_bbr.applimited = tp->t_http_closed;
13221 log.u_bbr.applimited <<= 8;
13222 log.u_bbr.applimited |= tp->t_http_open;
13223 log.u_bbr.applimited <<= 8;
13224 log.u_bbr.applimited |= tp->t_http_req;
13226 /* Copy out any client req info */
13228 log.u_bbr.pkt_epoch = (http_req->localtime / HPTS_USEC_IN_SEC);
13230 log.u_bbr.delivered = (http_req->localtime % HPTS_USEC_IN_SEC);
13231 log.u_bbr.rttProp = http_req->timestamp;
13232 log.u_bbr.cur_del_rate = http_req->start;
13233 if (http_req->flags & TCP_HTTP_TRACK_FLG_OPEN) {
13234 log.u_bbr.flex8 |= 1;
13236 log.u_bbr.flex8 |= 2;
13237 log.u_bbr.bw_inuse = http_req->end;
13239 log.u_bbr.flex6 = http_req->start_seq;
13240 if (http_req->flags & TCP_HTTP_TRACK_FLG_COMP) {
13241 log.u_bbr.flex8 |= 4;
13242 log.u_bbr.epoch = http_req->end_seq;
13246 memset(tcp_hdr_buf, 0, sizeof(tcp_hdr_buf));
13247 th = (struct tcphdr *)tcp_hdr_buf;
13248 th->th_seq = ae->seq;
13249 th->th_ack = ae->ack;
13250 th->th_win = ae->win;
13251 /* Now fill in the ports */
13252 th->th_sport = inp->inp_fport;
13253 th->th_dport = inp->inp_lport;
13254 tcp_set_flags(th, ae->flags);
13255 /* Now do we have a timestamp option? */
13256 if (ae->flags & HAS_TSTMP) {
13260 th->th_off = ((sizeof(struct tcphdr) + TCPOLEN_TSTAMP_APPA) >> 2);
13261 cp = (u_char *)(th + 1);
13266 *cp = TCPOPT_TIMESTAMP;
13268 *cp = TCPOLEN_TIMESTAMP;
13270 val = htonl(ae->ts_value);
13271 bcopy((char *)&val,
13272 (char *)cp, sizeof(uint32_t));
13273 val = htonl(ae->ts_echo);
13274 bcopy((char *)&val,
13275 (char *)(cp + 4), sizeof(uint32_t));
13277 th->th_off = (sizeof(struct tcphdr) >> 2);
13280 * For sane logging we need to play a little trick.
13281 * If the ack were fully processed we would have moved
13282 * snd_una to high_seq, but since compressed acks are
13283 * processed in two phases, at this point (logging) snd_una
13284 * won't be advanced. So we would see multiple acks showing
13285 * the advancement. We can prevent that by "pretending" that
13286 * snd_una was advanced and then un-advancing it so that the
13287 * logging code has the right value for tlb_snd_una.
13289 if (tp->snd_una != high_seq) {
13290 orig_snd_una = tp->snd_una;
13291 tp->snd_una = high_seq;
13295 TCP_LOG_EVENTP(tp, th,
13296 &tptosocket(tp)->so_rcv,
13297 &tptosocket(tp)->so_snd, TCP_LOG_IN, 0,
13298 0, &log, true, <v);
13300 tp->snd_una = orig_snd_una;
13307 rack_handle_probe_response(struct tcp_rack *rack, uint32_t tiwin, uint32_t us_cts)
13311 * A persist or keep-alive was forced out, update our
13312 * min rtt time. Note now worry about lost responses.
13313 * When a subsequent keep-alive or persist times out
13314 * and forced_ack is still on, then the last probe
13315 * was not responded to. In such cases we have a
13316 * sysctl that controls the behavior. Either we apply
13317 * the rtt but with reduced confidence (0). Or we just
13318 * plain don't apply the rtt estimate. Having data flow
13319 * will clear the probe_not_answered flag i.e. cum-ack
13320 * move forward <or> exiting and reentering persists.
13323 rack->forced_ack = 0;
13324 rack->rc_tp->t_rxtshift = 0;
13325 if ((rack->rc_in_persist &&
13326 (tiwin == rack->rc_tp->snd_wnd)) ||
13327 (rack->rc_in_persist == 0)) {
13329 * In persists only apply the RTT update if this is
13330 * a response to our window probe. And that
13331 * means the rwnd sent must match the current
13332 * snd_wnd. If it does not, then we got a
13333 * window update ack instead. For keepalive
13334 * we allow the answer no matter what the window.
13336 * Note that if the probe_not_answered is set then
13337 * the forced_ack_ts is the oldest one i.e. the first
13338 * probe sent that might have been lost. This assures
13339 * us that if we do calculate an RTT it is longer not
13340 * some short thing.
13342 if (rack->rc_in_persist)
13343 counter_u64_add(rack_persists_acks, 1);
13344 us_rtt = us_cts - rack->r_ctl.forced_ack_ts;
13347 if (rack->probe_not_answered == 0) {
13348 rack_apply_updated_usrtt(rack, us_rtt, us_cts);
13349 tcp_rack_xmit_timer(rack, us_rtt, 0, us_rtt, 3, NULL, 1);
13351 /* We have a retransmitted probe here too */
13352 if (rack_apply_rtt_with_reduced_conf) {
13353 rack_apply_updated_usrtt(rack, us_rtt, us_cts);
13354 tcp_rack_xmit_timer(rack, us_rtt, 0, us_rtt, 0, NULL, 1);
13361 rack_do_compressed_ack_processing(struct tcpcb *tp, struct socket *so, struct mbuf *m, int nxt_pkt, struct timeval *tv)
13364 * Handle a "special" compressed ack mbuf. Each incoming
13365 * ack has only four possible dispositions:
13367 * A) It moves the cum-ack forward
13368 * B) It is behind the cum-ack.
13369 * C) It is a window-update ack.
13370 * D) It is a dup-ack.
13372 * Note that we can have between 1 -> TCP_COMP_ACK_ENTRIES
13373 * in the incoming mbuf. We also need to still pay attention
13374 * to nxt_pkt since there may be another packet after this
13377 #ifdef TCP_ACCOUNTING
13382 struct timespec ts;
13383 struct tcp_rack *rack;
13384 struct tcp_ackent *ae;
13385 uint32_t tiwin, ms_cts, cts, acked, acked_amount, high_seq, win_seq, the_win, win_upd_ack;
13386 int cnt, i, did_out, ourfinisacked = 0;
13387 struct tcpopt to_holder, *to = NULL;
13388 #ifdef TCP_ACCOUNTING
13389 int win_up_req = 0;
13392 int under_pacing = 1;
13394 #ifdef TCP_ACCOUNTING
13397 rack = (struct tcp_rack *)tp->t_fb_ptr;
13398 if (rack->gp_ready &&
13399 (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT))
13404 if (rack->r_state != tp->t_state)
13405 rack_set_state(tp, rack);
13406 if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
13407 (tp->t_flags & TF_GPUTINPROG)) {
13409 * We have a goodput in progress
13410 * and we have entered a late state.
13411 * Do we have enough data in the sb
13412 * to handle the GPUT request?
13416 bytes = tp->gput_ack - tp->gput_seq;
13417 if (SEQ_GT(tp->gput_seq, tp->snd_una))
13418 bytes += tp->gput_seq - tp->snd_una;
13419 if (bytes > sbavail(&tptosocket(tp)->so_snd)) {
13421 * There are not enough bytes in the socket
13422 * buffer that have been sent to cover this
13423 * measurement. Cancel it.
13425 rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) /*flex2*/,
13426 rack->r_ctl.rc_gp_srtt /*flex1*/,
13428 0, 0, 18, __LINE__, NULL, 0);
13429 tp->t_flags &= ~TF_GPUTINPROG;
13434 KASSERT((m->m_len >= sizeof(struct tcp_ackent)),
13435 ("tp:%p m_cmpack:%p with invalid len:%u", tp, m, m->m_len));
13436 cnt = m->m_len / sizeof(struct tcp_ackent);
13437 counter_u64_add(rack_multi_single_eq, cnt);
13438 high_seq = tp->snd_una;
13439 the_win = tp->snd_wnd;
13440 win_seq = tp->snd_wl1;
13441 win_upd_ack = tp->snd_wl2;
13442 cts = tcp_tv_to_usectick(tv);
13443 ms_cts = tcp_tv_to_mssectick(tv);
13444 rack->r_ctl.rc_rcvtime = cts;
13445 segsiz = ctf_fixed_maxseg(tp);
13446 if ((rack->rc_gp_dyn_mul) &&
13447 (rack->use_fixed_rate == 0) &&
13448 (rack->rc_always_pace)) {
13449 /* Check in on probertt */
13450 rack_check_probe_rtt(rack, cts);
13452 for (i = 0; i < cnt; i++) {
13453 #ifdef TCP_ACCOUNTING
13454 ts_val = get_cyclecount();
13456 rack_clear_rate_sample(rack);
13457 ae = ((mtod(m, struct tcp_ackent *)) + i);
13458 /* Setup the window */
13459 tiwin = ae->win << tp->snd_scale;
13460 if (tiwin > rack->r_ctl.rc_high_rwnd)
13461 rack->r_ctl.rc_high_rwnd = tiwin;
13462 /* figure out the type of ack */
13463 if (SEQ_LT(ae->ack, high_seq)) {
13465 ae->ack_val_set = ACK_BEHIND;
13466 } else if (SEQ_GT(ae->ack, high_seq)) {
13468 ae->ack_val_set = ACK_CUMACK;
13469 } else if ((tiwin == the_win) && (rack->rc_in_persist == 0)){
13471 ae->ack_val_set = ACK_DUPACK;
13474 ae->ack_val_set = ACK_RWND;
13476 rack_log_input_packet(tp, rack, ae, ae->ack_val_set, high_seq);
13477 /* Validate timestamp */
13478 if (ae->flags & HAS_TSTMP) {
13479 /* Setup for a timestamp */
13480 to->to_flags = TOF_TS;
13481 ae->ts_echo -= tp->ts_offset;
13482 to->to_tsecr = ae->ts_echo;
13483 to->to_tsval = ae->ts_value;
13485 * If echoed timestamp is later than the current time, fall back to
13486 * non RFC1323 RTT calculation. Normalize timestamp if syncookies
13487 * were used when this connection was established.
13489 if (TSTMP_GT(ae->ts_echo, ms_cts))
13491 if (tp->ts_recent &&
13492 TSTMP_LT(ae->ts_value, tp->ts_recent)) {
13493 if (ctf_ts_check_ac(tp, (ae->flags & 0xff))) {
13494 #ifdef TCP_ACCOUNTING
13495 rdstc = get_cyclecount();
13496 if (rdstc > ts_val) {
13497 counter_u64_add(tcp_proc_time[ae->ack_val_set] ,
13499 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13500 tp->tcp_proc_time[ae->ack_val_set] += (rdstc - ts_val);
13507 if (SEQ_LEQ(ae->seq, tp->last_ack_sent) &&
13508 SEQ_LEQ(tp->last_ack_sent, ae->seq)) {
13509 tp->ts_recent_age = tcp_ts_getticks();
13510 tp->ts_recent = ae->ts_value;
13513 /* Setup for a no options */
13516 /* Update the rcv time and perform idle reduction possibly */
13517 if (tp->t_idle_reduce &&
13518 (tp->snd_max == tp->snd_una) &&
13519 (TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
13520 counter_u64_add(rack_input_idle_reduces, 1);
13521 rack_cc_after_idle(rack, tp);
13523 tp->t_rcvtime = ticks;
13524 /* Now what about ECN of a chain of pure ACKs? */
13525 if (tcp_ecn_input_segment(tp, ae->flags, 0,
13526 tcp_packets_this_ack(tp, ae->ack),
13528 rack_cong_signal(tp, CC_ECN, ae->ack, __LINE__);
13529 #ifdef TCP_ACCOUNTING
13530 /* Count for the specific type of ack in */
13531 counter_u64_add(tcp_cnt_counters[ae->ack_val_set], 1);
13532 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13533 tp->tcp_cnt_counters[ae->ack_val_set]++;
13537 * Note how we could move up these in the determination
13538 * above, but we don't so that way the timestamp checks (and ECN)
13539 * is done first before we do any processing on the ACK.
13540 * The non-compressed path through the code has this
13541 * weakness (noted by @jtl) that it actually does some
13542 * processing before verifying the timestamp information.
13543 * We don't take that path here which is why we set
13544 * the ack_val_set first, do the timestamp and ecn
13545 * processing, and then look at what we have setup.
13547 if (ae->ack_val_set == ACK_BEHIND) {
13549 * Case B flag reordering, if window is not closed
13550 * or it could be a keep-alive or persists
13552 if (SEQ_LT(ae->ack, tp->snd_una) && (sbspace(&so->so_rcv) > segsiz)) {
13553 rack->r_ctl.rc_reorder_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
13555 } else if (ae->ack_val_set == ACK_DUPACK) {
13557 rack_strike_dupack(rack);
13558 } else if (ae->ack_val_set == ACK_RWND) {
13560 if ((ae->flags & TSTMP_LRO) || (ae->flags & TSTMP_HDWR)) {
13561 ts.tv_sec = ae->timestamp / 1000000000;
13562 ts.tv_nsec = ae->timestamp % 1000000000;
13563 rack->r_ctl.act_rcv_time.tv_sec = ts.tv_sec;
13564 rack->r_ctl.act_rcv_time.tv_usec = ts.tv_nsec/1000;
13566 rack->r_ctl.act_rcv_time = *tv;
13568 if (rack->forced_ack) {
13569 rack_handle_probe_response(rack, tiwin,
13570 tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time));
13572 #ifdef TCP_ACCOUNTING
13575 win_upd_ack = ae->ack;
13578 rack_do_win_updates(tp, rack, the_win, win_seq, win_upd_ack, cts, high_seq);
13581 if (SEQ_GT(ae->ack, tp->snd_max)) {
13583 * We just send an ack since the incoming
13584 * ack is beyond the largest seq we sent.
13586 if ((tp->t_flags & TF_ACKNOW) == 0) {
13587 ctf_ack_war_checks(tp, &rack->r_ctl.challenge_ack_ts, &rack->r_ctl.challenge_ack_cnt);
13588 if (tp->t_flags && TF_ACKNOW)
13589 rack->r_wanted_output = 1;
13593 /* If the window changed setup to update */
13594 if (tiwin != tp->snd_wnd) {
13595 win_upd_ack = ae->ack;
13598 rack_do_win_updates(tp, rack, the_win, win_seq, win_upd_ack, cts, high_seq);
13600 #ifdef TCP_ACCOUNTING
13601 /* Account for the acks */
13602 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13603 tp->tcp_cnt_counters[CNT_OF_ACKS_IN] += (((ae->ack - high_seq) + segsiz - 1) / segsiz);
13605 counter_u64_add(tcp_cnt_counters[CNT_OF_ACKS_IN],
13606 (((ae->ack - high_seq) + segsiz - 1) / segsiz));
13608 high_seq = ae->ack;
13609 if (rack_verbose_logging && (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
13610 union tcp_log_stackspecific log;
13613 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
13614 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
13615 log.u_bbr.flex1 = high_seq;
13616 log.u_bbr.flex2 = rack->r_ctl.roundends;
13617 log.u_bbr.flex3 = rack->r_ctl.current_round;
13618 log.u_bbr.rttProp = (uint64_t)CC_ALGO(tp)->newround;
13619 log.u_bbr.flex8 = 8;
13620 tcp_log_event_(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
13621 0, &log, false, NULL, NULL, 0, &tv);
13624 * The draft (v3) calls for us to use SEQ_GEQ, but that
13625 * causes issues when we are just going app limited. Lets
13626 * instead use SEQ_GT <or> where its equal but more data
13629 if ((SEQ_GT(high_seq, rack->r_ctl.roundends)) ||
13630 ((high_seq == rack->r_ctl.roundends) &&
13631 SEQ_GT(tp->snd_max, tp->snd_una))) {
13632 rack->r_ctl.current_round++;
13633 rack->r_ctl.roundends = tp->snd_max;
13634 if (CC_ALGO(tp)->newround != NULL) {
13635 CC_ALGO(tp)->newround(&tp->t_ccv, rack->r_ctl.current_round);
13638 /* Setup our act_rcv_time */
13639 if ((ae->flags & TSTMP_LRO) || (ae->flags & TSTMP_HDWR)) {
13640 ts.tv_sec = ae->timestamp / 1000000000;
13641 ts.tv_nsec = ae->timestamp % 1000000000;
13642 rack->r_ctl.act_rcv_time.tv_sec = ts.tv_sec;
13643 rack->r_ctl.act_rcv_time.tv_usec = ts.tv_nsec/1000;
13645 rack->r_ctl.act_rcv_time = *tv;
13647 rack_process_to_cumack(tp, rack, ae->ack, cts, to);
13648 if (rack->rc_dsack_round_seen) {
13649 /* Is the dsack round over? */
13650 if (SEQ_GEQ(ae->ack, rack->r_ctl.dsack_round_end)) {
13652 rack->rc_dsack_round_seen = 0;
13653 rack_log_dsack_event(rack, 3, __LINE__, 0, 0);
13658 /* And lets be sure to commit the rtt measurements for this ack */
13659 tcp_rack_xmit_timer_commit(rack, tp);
13660 #ifdef TCP_ACCOUNTING
13661 rdstc = get_cyclecount();
13662 if (rdstc > ts_val) {
13663 counter_u64_add(tcp_proc_time[ae->ack_val_set] , (rdstc - ts_val));
13664 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13665 tp->tcp_proc_time[ae->ack_val_set] += (rdstc - ts_val);
13666 if (ae->ack_val_set == ACK_CUMACK)
13667 tp->tcp_proc_time[CYC_HANDLE_MAP] += (rdstc - ts_val);
13672 #ifdef TCP_ACCOUNTING
13673 ts_val = get_cyclecount();
13675 /* Tend to any collapsed window */
13676 if (SEQ_GT(tp->snd_max, high_seq) && (tp->snd_wnd < (tp->snd_max - high_seq))) {
13677 /* The peer collapsed the window */
13678 rack_collapsed_window(rack, (tp->snd_max - high_seq), __LINE__);
13679 } else if (rack->rc_has_collapsed)
13680 rack_un_collapse_window(rack, __LINE__);
13681 if ((rack->r_collapse_point_valid) &&
13682 (SEQ_GT(high_seq, rack->r_ctl.high_collapse_point)))
13683 rack->r_collapse_point_valid = 0;
13684 acked_amount = acked = (high_seq - tp->snd_una);
13687 * Clear the probe not answered flag
13688 * since cum-ack moved forward.
13690 rack->probe_not_answered = 0;
13691 if (rack->sack_attack_disable == 0)
13692 rack_do_decay(rack);
13693 if (acked >= segsiz) {
13695 * You only get credit for
13696 * MSS and greater (and you get extra
13697 * credit for larger cum-ack moves).
13701 ac = acked / segsiz;
13702 rack->r_ctl.ack_count += ac;
13703 counter_u64_add(rack_ack_total, ac);
13705 if (rack->r_ctl.ack_count > 0xfff00000) {
13707 * reduce the number to keep us under
13710 rack->r_ctl.ack_count /= 2;
13711 rack->r_ctl.sack_count /= 2;
13713 if (tp->t_flags & TF_NEEDSYN) {
13715 * T/TCP: Connection was half-synchronized, and our SYN has
13716 * been ACK'd (so connection is now fully synchronized). Go
13717 * to non-starred state, increment snd_una for ACK of SYN,
13718 * and check if we can do window scaling.
13720 tp->t_flags &= ~TF_NEEDSYN;
13722 acked_amount = acked = (high_seq - tp->snd_una);
13724 if (acked > sbavail(&so->so_snd))
13725 acked_amount = sbavail(&so->so_snd);
13726 #ifdef NETFLIX_EXP_DETECTION
13728 * We only care on a cum-ack move if we are in a sack-disabled
13729 * state. We have already added in to the ack_count, and we never
13730 * would disable on a cum-ack move, so we only care to do the
13731 * detection if it may "undo" it, i.e. we were in disabled already.
13733 if (rack->sack_attack_disable)
13734 rack_do_detection(tp, rack, acked_amount, segsiz);
13736 if (IN_FASTRECOVERY(tp->t_flags) &&
13737 (rack->rack_no_prr == 0))
13738 rack_update_prr(tp, rack, acked_amount, high_seq);
13739 if (IN_RECOVERY(tp->t_flags)) {
13740 if (SEQ_LT(high_seq, tp->snd_recover) &&
13741 (SEQ_LT(high_seq, tp->snd_max))) {
13742 tcp_rack_partialack(tp);
13744 rack_post_recovery(tp, high_seq);
13748 /* Handle the rack-log-ack part (sendmap) */
13749 if ((sbused(&so->so_snd) == 0) &&
13750 (acked > acked_amount) &&
13751 (tp->t_state >= TCPS_FIN_WAIT_1) &&
13752 (tp->t_flags & TF_SENTFIN)) {
13754 * We must be sure our fin
13755 * was sent and acked (we can be
13756 * in FIN_WAIT_1 without having
13761 * Lets make sure snd_una is updated
13762 * since most likely acked_amount = 0 (it
13765 tp->snd_una = high_seq;
13767 /* Did we make a RTO error? */
13768 if ((tp->t_flags & TF_PREVVALID) &&
13769 ((tp->t_flags & TF_RCVD_TSTMP) == 0)) {
13770 tp->t_flags &= ~TF_PREVVALID;
13771 if (tp->t_rxtshift == 1 &&
13772 (int)(ticks - tp->t_badrxtwin) < 0)
13773 rack_cong_signal(tp, CC_RTO_ERR, high_seq, __LINE__);
13775 /* Handle the data in the socket buffer */
13776 KMOD_TCPSTAT_ADD(tcps_rcvackpack, 1);
13777 KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked);
13778 if (acked_amount > 0) {
13779 struct mbuf *mfree;
13781 rack_ack_received(tp, rack, high_seq, nsegs, CC_ACK, recovery);
13782 SOCKBUF_LOCK(&so->so_snd);
13783 mfree = sbcut_locked(&so->so_snd, acked_amount);
13784 tp->snd_una = high_seq;
13785 /* Note we want to hold the sb lock through the sendmap adjust */
13786 rack_adjust_sendmap(rack, &so->so_snd, tp->snd_una);
13787 /* Wake up the socket if we have room to write more */
13788 rack_log_wakeup(tp,rack, &so->so_snd, acked, 2);
13789 sowwakeup_locked(so);
13792 /* update progress */
13793 tp->t_acktime = ticks;
13794 rack_log_progress_event(rack, tp, tp->t_acktime,
13795 PROGRESS_UPDATE, __LINE__);
13796 /* Clear out shifts and such */
13797 tp->t_rxtshift = 0;
13798 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
13799 rack_rto_min, rack_rto_max, rack->r_ctl.timer_slop);
13800 rack->rc_tlp_in_progress = 0;
13801 rack->r_ctl.rc_tlp_cnt_out = 0;
13802 /* Send recover and snd_nxt must be dragged along */
13803 if (SEQ_GT(tp->snd_una, tp->snd_recover))
13804 tp->snd_recover = tp->snd_una;
13805 if (SEQ_LT(tp->snd_nxt, tp->snd_una))
13806 tp->snd_nxt = tp->snd_una;
13808 * If the RXT timer is running we want to
13809 * stop it, so we can restart a TLP (or new RXT).
13811 if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT)
13812 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
13813 #ifdef NETFLIX_HTTP_LOGGING
13814 tcp_http_check_for_comp(rack->rc_tp, high_seq);
13816 tp->snd_wl2 = high_seq;
13818 if (under_pacing &&
13819 (rack->use_fixed_rate == 0) &&
13820 (rack->in_probe_rtt == 0) &&
13821 rack->rc_gp_dyn_mul &&
13822 rack->rc_always_pace) {
13823 /* Check if we are dragging bottom */
13824 rack_check_bottom_drag(tp, rack, so, acked);
13826 if (tp->snd_una == tp->snd_max) {
13827 tp->t_flags &= ~TF_PREVVALID;
13828 rack->r_ctl.retran_during_recovery = 0;
13829 rack->r_ctl.dsack_byte_cnt = 0;
13830 rack->r_ctl.rc_went_idle_time = tcp_get_usecs(NULL);
13831 if (rack->r_ctl.rc_went_idle_time == 0)
13832 rack->r_ctl.rc_went_idle_time = 1;
13833 rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__);
13834 if (sbavail(&tptosocket(tp)->so_snd) == 0)
13836 /* Set so we might enter persists... */
13837 rack->r_wanted_output = 1;
13838 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
13839 sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
13840 if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
13841 (sbavail(&so->so_snd) == 0) &&
13842 (tp->t_flags2 & TF2_DROP_AF_DATA)) {
13844 * The socket was gone and the
13845 * peer sent data (not now in the past), time to
13848 rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__);
13849 /* tcp_close will kill the inp pre-log the Reset */
13850 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
13851 #ifdef TCP_ACCOUNTING
13852 rdstc = get_cyclecount();
13853 if (rdstc > ts_val) {
13854 counter_u64_add(tcp_proc_time[ACK_CUMACK] , (rdstc - ts_val));
13855 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13856 tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
13857 tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
13862 tp = tcp_close(tp);
13864 #ifdef TCP_ACCOUNTING
13870 * We would normally do drop-with-reset which would
13871 * send back a reset. We can't since we don't have
13872 * all the needed bits. Instead lets arrange for
13873 * a call to tcp_output(). That way since we
13874 * are in the closed state we will generate a reset.
13876 * Note if tcp_accounting is on we don't unpin since
13877 * we do that after the goto label.
13879 goto send_out_a_rst;
13881 if ((sbused(&so->so_snd) == 0) &&
13882 (tp->t_state >= TCPS_FIN_WAIT_1) &&
13883 (tp->t_flags & TF_SENTFIN)) {
13885 * If we can't receive any more data, then closing user can
13886 * proceed. Starting the timer is contrary to the
13887 * specification, but if we don't get a FIN we'll hang
13891 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
13892 soisdisconnected(so);
13893 tcp_timer_activate(tp, TT_2MSL,
13894 (tcp_fast_finwait2_recycle ?
13895 tcp_finwait2_timeout :
13898 if (ourfinisacked == 0) {
13900 * We don't change to fin-wait-2 if we have our fin acked
13901 * which means we are probably in TCPS_CLOSING.
13903 tcp_state_change(tp, TCPS_FIN_WAIT_2);
13907 /* Wake up the socket if we have room to write more */
13908 if (sbavail(&so->so_snd)) {
13909 rack->r_wanted_output = 1;
13910 if (ctf_progress_timeout_check(tp, true)) {
13911 rack_log_progress_event((struct tcp_rack *)tp->t_fb_ptr,
13912 tp, tick, PROGRESS_DROP, __LINE__);
13914 * We cheat here and don't send a RST, we should send one
13915 * when the pacer drops the connection.
13917 #ifdef TCP_ACCOUNTING
13918 rdstc = get_cyclecount();
13919 if (rdstc > ts_val) {
13920 counter_u64_add(tcp_proc_time[ACK_CUMACK] , (rdstc - ts_val));
13921 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13922 tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
13923 tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
13928 (void)tcp_drop(tp, ETIMEDOUT);
13933 if (ourfinisacked) {
13934 switch(tp->t_state) {
13936 #ifdef TCP_ACCOUNTING
13937 rdstc = get_cyclecount();
13938 if (rdstc > ts_val) {
13939 counter_u64_add(tcp_proc_time[ACK_CUMACK] ,
13941 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13942 tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
13943 tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
13952 case TCPS_LAST_ACK:
13953 #ifdef TCP_ACCOUNTING
13954 rdstc = get_cyclecount();
13955 if (rdstc > ts_val) {
13956 counter_u64_add(tcp_proc_time[ACK_CUMACK] ,
13958 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13959 tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
13960 tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
13965 tp = tcp_close(tp);
13966 ctf_do_drop(m, tp);
13969 case TCPS_FIN_WAIT_1:
13970 #ifdef TCP_ACCOUNTING
13971 rdstc = get_cyclecount();
13972 if (rdstc > ts_val) {
13973 counter_u64_add(tcp_proc_time[ACK_CUMACK] ,
13975 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
13976 tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
13977 tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
13981 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
13982 soisdisconnected(so);
13983 tcp_timer_activate(tp, TT_2MSL,
13984 (tcp_fast_finwait2_recycle ?
13985 tcp_finwait2_timeout :
13988 tcp_state_change(tp, TCPS_FIN_WAIT_2);
13994 if (rack->r_fast_output) {
13996 * We re doing fast output.. can we expand that?
13998 rack_gain_for_fastoutput(rack, tp, so, acked_amount);
14000 #ifdef TCP_ACCOUNTING
14001 rdstc = get_cyclecount();
14002 if (rdstc > ts_val) {
14003 counter_u64_add(tcp_proc_time[ACK_CUMACK] , (rdstc - ts_val));
14004 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
14005 tp->tcp_proc_time[ACK_CUMACK] += (rdstc - ts_val);
14006 tp->tcp_proc_time[CYC_HANDLE_ACK] += (rdstc - ts_val);
14010 } else if (win_up_req) {
14011 rdstc = get_cyclecount();
14012 if (rdstc > ts_val) {
14013 counter_u64_add(tcp_proc_time[ACK_RWND] , (rdstc - ts_val));
14014 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
14015 tp->tcp_proc_time[ACK_RWND] += (rdstc - ts_val);
14020 /* Now is there a next packet, if so we are done */
14024 #ifdef TCP_ACCOUNTING
14027 rack_log_doseg_done(rack, cts, nxt_pkt, did_out, 5, nsegs);
14030 rack_handle_might_revert(tp, rack);
14031 ctf_calc_rwin(so, tp);
14032 if ((rack->r_wanted_output != 0) || (rack->r_fast_output != 0)) {
14034 if (tcp_output(tp) < 0) {
14035 #ifdef TCP_ACCOUNTING
14042 rack_free_trim(rack);
14043 #ifdef TCP_ACCOUNTING
14046 rack_timer_audit(tp, rack, &so->so_snd);
14047 rack_log_doseg_done(rack, cts, nxt_pkt, did_out, 6, nsegs);
14053 rack_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so,
14054 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos,
14055 int32_t nxt_pkt, struct timeval *tv)
14057 struct inpcb *inp = tptoinpcb(tp);
14058 #ifdef TCP_ACCOUNTING
14061 int32_t thflags, retval, did_out = 0;
14062 int32_t way_out = 0;
14064 * cts - is the current time from tv (caller gets ts) in microseconds.
14065 * ms_cts - is the current time from tv in milliseconds.
14066 * us_cts - is the time that LRO or hardware actually got the packet in microseconds.
14068 uint32_t cts, us_cts, ms_cts;
14069 uint32_t tiwin, high_seq;
14070 struct timespec ts;
14072 struct tcp_rack *rack;
14073 struct rack_sendmap *rsm;
14074 int32_t prev_state = 0;
14075 #ifdef TCP_ACCOUNTING
14076 int ack_val_set = 0xf;
14080 NET_EPOCH_ASSERT();
14081 INP_WLOCK_ASSERT(inp);
14084 * tv passed from common code is from either M_TSTMP_LRO or
14085 * tcp_get_usecs() if no LRO m_pkthdr timestamp is present.
14087 rack = (struct tcp_rack *)tp->t_fb_ptr;
14088 if (m->m_flags & M_ACKCMP) {
14090 * All compressed ack's are ack's by definition so
14091 * remove any ack required flag and then do the processing.
14093 rack->rc_ack_required = 0;
14094 return (rack_do_compressed_ack_processing(tp, so, m, nxt_pkt, tv));
14096 if (m->m_flags & M_ACKCMP) {
14097 panic("Impossible reach m has ackcmp? m:%p tp:%p", m, tp);
14099 cts = tcp_tv_to_usectick(tv);
14100 ms_cts = tcp_tv_to_mssectick(tv);
14101 nsegs = m->m_pkthdr.lro_nsegs;
14102 counter_u64_add(rack_proc_non_comp_ack, 1);
14103 thflags = tcp_get_flags(th);
14104 #ifdef TCP_ACCOUNTING
14106 if (thflags & TH_ACK)
14107 ts_val = get_cyclecount();
14109 if ((m->m_flags & M_TSTMP) ||
14110 (m->m_flags & M_TSTMP_LRO)) {
14111 mbuf_tstmp2timespec(m, &ts);
14112 rack->r_ctl.act_rcv_time.tv_sec = ts.tv_sec;
14113 rack->r_ctl.act_rcv_time.tv_usec = ts.tv_nsec/1000;
14115 rack->r_ctl.act_rcv_time = *tv;
14116 kern_prefetch(rack, &prev_state);
14119 * Unscale the window into a 32-bit value. For the SYN_SENT state
14120 * the scale is zero.
14122 tiwin = th->th_win << tp->snd_scale;
14123 #ifdef TCP_ACCOUNTING
14124 if (thflags & TH_ACK) {
14126 * We have a tradeoff here. We can either do what we are
14127 * doing i.e. pinning to this CPU and then doing the accounting
14128 * <or> we could do a critical enter, setup the rdtsc and cpu
14129 * as in below, and then validate we are on the same CPU on
14130 * exit. I have choosen to not do the critical enter since
14131 * that often will gain you a context switch, and instead lock
14132 * us (line above this if) to the same CPU with sched_pin(). This
14133 * means we may be context switched out for a higher priority
14134 * interupt but we won't be moved to another CPU.
14136 * If this occurs (which it won't very often since we most likely
14137 * are running this code in interupt context and only a higher
14138 * priority will bump us ... clock?) we will falsely add in
14139 * to the time the interupt processing time plus the ack processing
14140 * time. This is ok since its a rare event.
14142 ack_val_set = tcp_do_ack_accounting(tp, th, &to, tiwin,
14143 ctf_fixed_maxseg(tp));
14147 * Parse options on any incoming segment.
14149 memset(&to, 0, sizeof(to));
14150 tcp_dooptions(&to, (u_char *)(th + 1),
14151 (th->th_off << 2) - sizeof(struct tcphdr),
14152 (thflags & TH_SYN) ? TO_SYN : 0);
14153 KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN",
14155 KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT",
14158 if ((tp->t_state >= TCPS_FIN_WAIT_1) &&
14159 (tp->t_flags & TF_GPUTINPROG)) {
14161 * We have a goodput in progress
14162 * and we have entered a late state.
14163 * Do we have enough data in the sb
14164 * to handle the GPUT request?
14168 bytes = tp->gput_ack - tp->gput_seq;
14169 if (SEQ_GT(tp->gput_seq, tp->snd_una))
14170 bytes += tp->gput_seq - tp->snd_una;
14171 if (bytes > sbavail(&tptosocket(tp)->so_snd)) {
14173 * There are not enough bytes in the socket
14174 * buffer that have been sent to cover this
14175 * measurement. Cancel it.
14177 rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) /*flex2*/,
14178 rack->r_ctl.rc_gp_srtt /*flex1*/,
14180 0, 0, 18, __LINE__, NULL, 0);
14181 tp->t_flags &= ~TF_GPUTINPROG;
14184 high_seq = th->th_ack;
14185 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
14186 union tcp_log_stackspecific log;
14187 struct timeval ltv;
14188 #ifdef NETFLIX_HTTP_LOGGING
14189 struct http_sendfile_track *http_req;
14191 if (SEQ_GT(th->th_ack, tp->snd_una)) {
14192 http_req = tcp_http_find_req_for_seq(tp, (th->th_ack-1));
14194 http_req = tcp_http_find_req_for_seq(tp, th->th_ack);
14197 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
14198 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
14199 if (rack->rack_no_prr == 0)
14200 log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
14202 log.u_bbr.flex1 = 0;
14203 log.u_bbr.use_lt_bw = rack->r_ent_rec_ns;
14204 log.u_bbr.use_lt_bw <<= 1;
14205 log.u_bbr.use_lt_bw |= rack->r_might_revert;
14206 log.u_bbr.flex2 = rack->r_ctl.rc_num_maps_alloced;
14207 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
14208 log.u_bbr.pkts_out = rack->rc_tp->t_maxseg;
14209 log.u_bbr.flex3 = m->m_flags;
14210 log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags;
14211 log.u_bbr.lost = thflags;
14212 log.u_bbr.pacing_gain = 0x1;
14213 #ifdef TCP_ACCOUNTING
14214 log.u_bbr.cwnd_gain = ack_val_set;
14216 log.u_bbr.flex7 = 2;
14217 if (m->m_flags & M_TSTMP) {
14218 /* Record the hardware timestamp if present */
14219 mbuf_tstmp2timespec(m, &ts);
14220 ltv.tv_sec = ts.tv_sec;
14221 ltv.tv_usec = ts.tv_nsec / 1000;
14222 log.u_bbr.lt_epoch = tcp_tv_to_usectick(<v);
14223 } else if (m->m_flags & M_TSTMP_LRO) {
14224 /* Record the LRO the arrival timestamp */
14225 mbuf_tstmp2timespec(m, &ts);
14226 ltv.tv_sec = ts.tv_sec;
14227 ltv.tv_usec = ts.tv_nsec / 1000;
14228 log.u_bbr.flex5 = tcp_tv_to_usectick(<v);
14230 log.u_bbr.timeStamp = tcp_get_usecs(<v);
14231 /* Log the rcv time */
14232 log.u_bbr.delRate = m->m_pkthdr.rcv_tstmp;
14233 #ifdef NETFLIX_HTTP_LOGGING
14234 log.u_bbr.applimited = tp->t_http_closed;
14235 log.u_bbr.applimited <<= 8;
14236 log.u_bbr.applimited |= tp->t_http_open;
14237 log.u_bbr.applimited <<= 8;
14238 log.u_bbr.applimited |= tp->t_http_req;
14240 /* Copy out any client req info */
14242 log.u_bbr.pkt_epoch = (http_req->localtime / HPTS_USEC_IN_SEC);
14244 log.u_bbr.delivered = (http_req->localtime % HPTS_USEC_IN_SEC);
14245 log.u_bbr.rttProp = http_req->timestamp;
14246 log.u_bbr.cur_del_rate = http_req->start;
14247 if (http_req->flags & TCP_HTTP_TRACK_FLG_OPEN) {
14248 log.u_bbr.flex8 |= 1;
14250 log.u_bbr.flex8 |= 2;
14251 log.u_bbr.bw_inuse = http_req->end;
14253 log.u_bbr.flex6 = http_req->start_seq;
14254 if (http_req->flags & TCP_HTTP_TRACK_FLG_COMP) {
14255 log.u_bbr.flex8 |= 4;
14256 log.u_bbr.epoch = http_req->end_seq;
14260 TCP_LOG_EVENTP(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0,
14261 tlen, &log, true, <v);
14263 /* Remove ack required flag if set, we have one */
14264 if (thflags & TH_ACK)
14265 rack->rc_ack_required = 0;
14266 if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) {
14270 goto done_with_input;
14273 * If a segment with the ACK-bit set arrives in the SYN-SENT state
14274 * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9.
14276 if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) &&
14277 (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) {
14278 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT);
14279 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen);
14280 #ifdef TCP_ACCOUNTING
14286 * If timestamps were negotiated during SYN/ACK and a
14287 * segment without a timestamp is received, silently drop
14288 * the segment, unless it is a RST segment or missing timestamps are
14290 * See section 3.2 of RFC 7323.
14292 if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) &&
14293 ((thflags & TH_RST) == 0) && (V_tcp_tolerate_missing_ts == 0)) {
14297 goto done_with_input;
14301 * Segment received on connection. Reset idle time and keep-alive
14302 * timer. XXX: This should be done after segment validation to
14303 * ignore broken/spoofed segs.
14305 if (tp->t_idle_reduce &&
14306 (tp->snd_max == tp->snd_una) &&
14307 (TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
14308 counter_u64_add(rack_input_idle_reduces, 1);
14309 rack_cc_after_idle(rack, tp);
14311 tp->t_rcvtime = ticks;
14313 stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin);
14315 if (tiwin > rack->r_ctl.rc_high_rwnd)
14316 rack->r_ctl.rc_high_rwnd = tiwin;
14318 * TCP ECN processing. XXXJTL: If we ever use ECN, we need to move
14319 * this to occur after we've validated the segment.
14321 if (tcp_ecn_input_segment(tp, thflags, tlen,
14322 tcp_packets_this_ack(tp, th->th_ack),
14324 rack_cong_signal(tp, CC_ECN, th->th_ack, __LINE__);
14327 * If echoed timestamp is later than the current time, fall back to
14328 * non RFC1323 RTT calculation. Normalize timestamp if syncookies
14329 * were used when this connection was established.
14331 if ((to.to_flags & TOF_TS) && (to.to_tsecr != 0)) {
14332 to.to_tsecr -= tp->ts_offset;
14333 if (TSTMP_GT(to.to_tsecr, ms_cts))
14338 * If its the first time in we need to take care of options and
14339 * verify we can do SACK for rack!
14341 if (rack->r_state == 0) {
14342 /* Should be init'd by rack_init() */
14343 KASSERT(rack->rc_inp != NULL,
14344 ("%s: rack->rc_inp unexpectedly NULL", __func__));
14345 if (rack->rc_inp == NULL) {
14346 rack->rc_inp = inp;
14350 * Process options only when we get SYN/ACK back. The SYN
14351 * case for incoming connections is handled in tcp_syncache.
14352 * According to RFC1323 the window field in a SYN (i.e., a
14353 * <SYN> or <SYN,ACK>) segment itself is never scaled. XXX
14354 * this is traditional behavior, may need to be cleaned up.
14356 if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {
14357 /* Handle parallel SYN for ECN */
14358 tcp_ecn_input_parallel_syn(tp, thflags, iptos);
14359 if ((to.to_flags & TOF_SCALE) &&
14360 (tp->t_flags & TF_REQ_SCALE)) {
14361 tp->t_flags |= TF_RCVD_SCALE;
14362 tp->snd_scale = to.to_wscale;
14364 tp->t_flags &= ~TF_REQ_SCALE;
14366 * Initial send window. It will be updated with the
14367 * next incoming segment to the scaled value.
14369 tp->snd_wnd = th->th_win;
14370 rack_validate_fo_sendwin_up(tp, rack);
14371 if ((to.to_flags & TOF_TS) &&
14372 (tp->t_flags & TF_REQ_TSTMP)) {
14373 tp->t_flags |= TF_RCVD_TSTMP;
14374 tp->ts_recent = to.to_tsval;
14375 tp->ts_recent_age = cts;
14377 tp->t_flags &= ~TF_REQ_TSTMP;
14378 if (to.to_flags & TOF_MSS) {
14379 tcp_mss(tp, to.to_mss);
14381 if ((tp->t_flags & TF_SACK_PERMIT) &&
14382 (to.to_flags & TOF_SACKPERM) == 0)
14383 tp->t_flags &= ~TF_SACK_PERMIT;
14384 if (IS_FASTOPEN(tp->t_flags)) {
14385 if (to.to_flags & TOF_FASTOPEN) {
14388 if (to.to_flags & TOF_MSS)
14391 if ((inp->inp_vflag & INP_IPV6) != 0)
14395 tcp_fastopen_update_cache(tp, mss,
14396 to.to_tfo_len, to.to_tfo_cookie);
14398 tcp_fastopen_disable_path(tp);
14402 * At this point we are at the initial call. Here we decide
14403 * if we are doing RACK or not. We do this by seeing if
14404 * TF_SACK_PERMIT is set and the sack-not-required is clear.
14405 * The code now does do dup-ack counting so if you don't
14406 * switch back you won't get rack & TLP, but you will still
14410 if ((rack_sack_not_required == 0) &&
14411 ((tp->t_flags & TF_SACK_PERMIT) == 0)) {
14412 tcp_switch_back_to_default(tp);
14413 (*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen,
14415 #ifdef TCP_ACCOUNTING
14421 sack_filter_clear(&rack->r_ctl.rack_sf, th->th_ack);
14423 if (thflags & TH_FIN)
14424 tcp_log_end_status(tp, TCP_EI_STATUS_CLIENT_FIN);
14425 us_cts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
14426 if ((rack->rc_gp_dyn_mul) &&
14427 (rack->use_fixed_rate == 0) &&
14428 (rack->rc_always_pace)) {
14429 /* Check in on probertt */
14430 rack_check_probe_rtt(rack, us_cts);
14432 rack_clear_rate_sample(rack);
14433 if ((rack->forced_ack) &&
14434 ((tcp_get_flags(th) & TH_RST) == 0)) {
14435 rack_handle_probe_response(rack, tiwin, us_cts);
14438 * This is the one exception case where we set the rack state
14439 * always. All other times (timers etc) we must have a rack-state
14440 * set (so we assure we have done the checks above for SACK).
14442 rack->r_ctl.rc_rcvtime = cts;
14443 if (rack->r_state != tp->t_state)
14444 rack_set_state(tp, rack);
14445 if (SEQ_GT(th->th_ack, tp->snd_una) &&
14446 (rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree)) != NULL)
14447 kern_prefetch(rsm, &prev_state);
14448 prev_state = rack->r_state;
14449 retval = (*rack->r_substate) (m, th, so,
14450 tp, &to, drop_hdrlen,
14451 tlen, tiwin, thflags, nxt_pkt, iptos);
14454 * If retval is 1 the tcb is unlocked and most likely the tp
14457 INP_WLOCK_ASSERT(inp);
14458 if ((rack->rc_gp_dyn_mul) &&
14459 (rack->rc_always_pace) &&
14460 (rack->use_fixed_rate == 0) &&
14461 rack->in_probe_rtt &&
14462 (rack->r_ctl.rc_time_probertt_starts == 0)) {
14464 * If we are going for target, lets recheck before
14467 rack_check_probe_rtt(rack, us_cts);
14469 if (rack->set_pacing_done_a_iw == 0) {
14470 /* How much has been acked? */
14471 if ((tp->snd_una - tp->iss) > (ctf_fixed_maxseg(tp) * 10)) {
14472 /* We have enough to set in the pacing segment size */
14473 rack->set_pacing_done_a_iw = 1;
14474 rack_set_pace_segments(tp, rack, __LINE__, NULL);
14477 tcp_rack_xmit_timer_commit(rack, tp);
14478 #ifdef TCP_ACCOUNTING
14480 * If we set the ack_val_se to what ack processing we are doing
14481 * we also want to track how many cycles we burned. Note
14482 * the bits after tcp_output we let be "free". This is because
14483 * we are also tracking the tcp_output times as well. Note the
14484 * use of 0xf here since we only have 11 counter (0 - 0xa) and
14485 * 0xf cannot be returned and is what we initialize it too to
14486 * indicate we are not doing the tabulations.
14488 if (ack_val_set != 0xf) {
14491 crtsc = get_cyclecount();
14492 counter_u64_add(tcp_proc_time[ack_val_set] , (crtsc - ts_val));
14493 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
14494 tp->tcp_proc_time[ack_val_set] += (crtsc - ts_val);
14498 if (nxt_pkt == 0) {
14499 if ((rack->r_wanted_output != 0) || (rack->r_fast_output != 0)) {
14501 if (tcp_output(tp) < 0)
14505 rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
14506 rack_free_trim(rack);
14508 /* Update any rounds needed */
14509 if (rack_verbose_logging && (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) {
14510 union tcp_log_stackspecific log;
14513 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
14514 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
14515 log.u_bbr.flex1 = high_seq;
14516 log.u_bbr.flex2 = rack->r_ctl.roundends;
14517 log.u_bbr.flex3 = rack->r_ctl.current_round;
14518 log.u_bbr.rttProp = (uint64_t)CC_ALGO(tp)->newround;
14519 log.u_bbr.flex8 = 9;
14520 tcp_log_event_(tp, NULL, NULL, NULL, BBR_LOG_CWND, 0,
14521 0, &log, false, NULL, NULL, 0, &tv);
14524 * The draft (v3) calls for us to use SEQ_GEQ, but that
14525 * causes issues when we are just going app limited. Lets
14526 * instead use SEQ_GT <or> where its equal but more data
14529 if ((SEQ_GT(tp->snd_una, rack->r_ctl.roundends)) ||
14530 ((tp->snd_una == rack->r_ctl.roundends) && SEQ_GT(tp->snd_max, tp->snd_una))) {
14531 rack->r_ctl.current_round++;
14532 rack->r_ctl.roundends = tp->snd_max;
14533 if (CC_ALGO(tp)->newround != NULL) {
14534 CC_ALGO(tp)->newround(&tp->t_ccv, rack->r_ctl.current_round);
14537 if ((nxt_pkt == 0) &&
14538 ((rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) &&
14539 (SEQ_GT(tp->snd_max, tp->snd_una) ||
14540 (tp->t_flags & TF_DELACK) ||
14541 ((V_tcp_always_keepalive || rack->rc_inp->inp_socket->so_options & SO_KEEPALIVE) &&
14542 (tp->t_state <= TCPS_CLOSING)))) {
14543 /* We could not send (probably in the hpts but stopped the timer earlier)? */
14544 if ((tp->snd_max == tp->snd_una) &&
14545 ((tp->t_flags & TF_DELACK) == 0) &&
14546 (tcp_in_hpts(rack->rc_inp)) &&
14547 (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) {
14548 /* keep alive not needed if we are hptsi output yet */
14552 if (tcp_in_hpts(inp)) {
14553 if (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) {
14554 us_cts = tcp_get_usecs(NULL);
14555 if (TSTMP_GT(rack->r_ctl.rc_last_output_to, us_cts)) {
14557 rack->r_ctl.rc_agg_early += (rack->r_ctl.rc_last_output_to - us_cts);
14560 rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
14562 tcp_hpts_remove(inp);
14564 if (late && (did_out == 0)) {
14566 * We are late in the sending
14567 * and we did not call the output
14568 * (this probably should not happen).
14570 goto do_output_now;
14572 rack_start_hpts_timer(rack, tp, tcp_get_usecs(NULL), 0, 0, 0);
14575 } else if (nxt_pkt == 0) {
14576 /* Do we have the correct timer running? */
14577 rack_timer_audit(tp, rack, &so->so_snd);
14581 rack_log_doseg_done(rack, cts, nxt_pkt, did_out, way_out, max(1, nsegs));
14583 rack->r_wanted_output = 0;
14584 #ifdef TCP_ACCOUNTING
14587 * Track the time (see above).
14589 if (ack_val_set != 0xf) {
14592 crtsc = get_cyclecount();
14593 counter_u64_add(tcp_proc_time[ack_val_set] , (crtsc - ts_val));
14595 * Note we *DO NOT* increment the per-tcb counters since
14596 * in the else the TP may be gone!!
14601 #ifdef TCP_ACCOUNTING
14608 rack_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
14609 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos)
14613 /* First lets see if we have old packets */
14614 if (tp->t_in_pkt) {
14615 if (ctf_do_queued_segments(so, tp, 1)) {
14620 if (m->m_flags & M_TSTMP_LRO) {
14621 mbuf_tstmp2timeval(m, &tv);
14623 /* Should not be should we kassert instead? */
14624 tcp_get_usecs(&tv);
14626 if (rack_do_segment_nounlock(m, th, so, tp,
14627 drop_hdrlen, tlen, iptos, 0, &tv) == 0) {
14628 INP_WUNLOCK(tptoinpcb(tp));
14632 struct rack_sendmap *
14633 tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack, uint32_t tsused)
14635 struct rack_sendmap *rsm = NULL;
14637 uint32_t srtt = 0, thresh = 0, ts_low = 0;
14639 /* Return the next guy to be re-transmitted */
14640 if (RB_EMPTY(&rack->r_ctl.rc_mtree)) {
14643 if (tp->t_flags & TF_SENTFIN) {
14644 /* retran the end FIN? */
14647 /* ok lets look at this one */
14648 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
14649 if (rack->r_must_retran && rsm && (rsm->r_flags & RACK_MUST_RXT)) {
14652 if (rsm && ((rsm->r_flags & RACK_ACKED) == 0)) {
14655 rsm = rack_find_lowest_rsm(rack);
14660 if (((rack->rc_tp->t_flags & TF_SACK_PERMIT) == 0) &&
14661 (rsm->r_dupack >= DUP_ACK_THRESHOLD)) {
14663 * No sack so we automatically do the 3 strikes and
14664 * retransmit (no rack timer would be started).
14669 if (rsm->r_flags & RACK_ACKED) {
14672 if (((rsm->r_flags & RACK_SACK_PASSED) == 0) &&
14673 (rsm->r_dupack < DUP_ACK_THRESHOLD)) {
14674 /* Its not yet ready */
14677 srtt = rack_grab_rtt(tp, rack);
14678 idx = rsm->r_rtr_cnt - 1;
14679 ts_low = (uint32_t)rsm->r_tim_lastsent[idx];
14680 thresh = rack_calc_thresh_rack(rack, srtt, tsused);
14681 if ((tsused == ts_low) ||
14682 (TSTMP_LT(tsused, ts_low))) {
14683 /* No time since sending */
14686 if ((tsused - ts_low) < thresh) {
14687 /* It has not been long enough yet */
14690 if ((rsm->r_dupack >= DUP_ACK_THRESHOLD) ||
14691 ((rsm->r_flags & RACK_SACK_PASSED) &&
14692 (rack->sack_attack_disable == 0))) {
14694 * We have passed the dup-ack threshold <or>
14695 * a SACK has indicated this is missing.
14696 * Note that if you are a declared attacker
14697 * it is only the dup-ack threshold that
14698 * will cause retransmits.
14700 /* log retransmit reason */
14701 rack_log_retran_reason(rack, rsm, (tsused - ts_low), thresh, 1);
14702 rack->r_fast_output = 0;
14709 rack_log_pacing_delay_calc(struct tcp_rack *rack, uint32_t len, uint32_t slot,
14710 uint64_t bw_est, uint64_t bw, uint64_t len_time, int method,
14711 int line, struct rack_sendmap *rsm, uint8_t quality)
14713 if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
14714 union tcp_log_stackspecific log;
14717 memset(&log, 0, sizeof(log));
14718 log.u_bbr.flex1 = slot;
14719 log.u_bbr.flex2 = len;
14720 log.u_bbr.flex3 = rack->r_ctl.rc_pace_min_segs;
14721 log.u_bbr.flex4 = rack->r_ctl.rc_pace_max_segs;
14722 log.u_bbr.flex5 = rack->r_ctl.rack_per_of_gp_ss;
14723 log.u_bbr.flex6 = rack->r_ctl.rack_per_of_gp_ca;
14724 log.u_bbr.use_lt_bw = rack->rc_ack_can_sendout_data;
14725 log.u_bbr.use_lt_bw <<= 1;
14726 log.u_bbr.use_lt_bw |= rack->r_late;
14727 log.u_bbr.use_lt_bw <<= 1;
14728 log.u_bbr.use_lt_bw |= rack->r_early;
14729 log.u_bbr.use_lt_bw <<= 1;
14730 log.u_bbr.use_lt_bw |= rack->app_limited_needs_set;
14731 log.u_bbr.use_lt_bw <<= 1;
14732 log.u_bbr.use_lt_bw |= rack->rc_gp_filled;
14733 log.u_bbr.use_lt_bw <<= 1;
14734 log.u_bbr.use_lt_bw |= rack->measure_saw_probe_rtt;
14735 log.u_bbr.use_lt_bw <<= 1;
14736 log.u_bbr.use_lt_bw |= rack->in_probe_rtt;
14737 log.u_bbr.use_lt_bw <<= 1;
14738 log.u_bbr.use_lt_bw |= rack->gp_ready;
14739 log.u_bbr.pkt_epoch = line;
14740 log.u_bbr.epoch = rack->r_ctl.rc_agg_delayed;
14741 log.u_bbr.lt_epoch = rack->r_ctl.rc_agg_early;
14742 log.u_bbr.applimited = rack->r_ctl.rack_per_of_gp_rec;
14743 log.u_bbr.bw_inuse = bw_est;
14744 log.u_bbr.delRate = bw;
14745 if (rack->r_ctl.gp_bw == 0)
14746 log.u_bbr.cur_del_rate = 0;
14748 log.u_bbr.cur_del_rate = rack_get_bw(rack);
14749 log.u_bbr.rttProp = len_time;
14750 log.u_bbr.pkts_out = rack->r_ctl.rc_rack_min_rtt;
14751 log.u_bbr.lost = rack->r_ctl.rc_probertt_sndmax_atexit;
14752 log.u_bbr.pacing_gain = rack_get_output_gain(rack, rsm);
14753 if (rack->r_ctl.cwnd_to_use < rack->rc_tp->snd_ssthresh) {
14754 /* We are in slow start */
14755 log.u_bbr.flex7 = 1;
14757 /* we are on congestion avoidance */
14758 log.u_bbr.flex7 = 0;
14760 log.u_bbr.flex8 = method;
14761 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
14762 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
14763 log.u_bbr.cwnd_gain = rack->rc_gp_saw_rec;
14764 log.u_bbr.cwnd_gain <<= 1;
14765 log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ss;
14766 log.u_bbr.cwnd_gain <<= 1;
14767 log.u_bbr.cwnd_gain |= rack->rc_gp_saw_ca;
14768 log.u_bbr.bbr_substate = quality;
14769 TCP_LOG_EVENTP(rack->rc_tp, NULL,
14770 &rack->rc_inp->inp_socket->so_rcv,
14771 &rack->rc_inp->inp_socket->so_snd,
14772 BBR_LOG_HPTSI_CALC, 0,
14773 0, &log, false, &tv);
14778 rack_get_pacing_len(struct tcp_rack *rack, uint64_t bw, uint32_t mss)
14780 uint32_t new_tso, user_max;
14782 user_max = rack->rc_user_set_max_segs * mss;
14783 if (rack->rc_force_max_seg) {
14786 if (rack->use_fixed_rate &&
14787 ((rack->r_ctl.crte == NULL) ||
14788 (bw != rack->r_ctl.crte->rate))) {
14789 /* Use the user mss since we are not exactly matched */
14792 new_tso = tcp_get_pacing_burst_size(rack->rc_tp, bw, mss, rack_pace_one_seg, rack->r_ctl.crte, NULL);
14793 if (new_tso > user_max)
14794 new_tso = user_max;
14799 pace_to_fill_cwnd(struct tcp_rack *rack, int32_t slot, uint32_t len, uint32_t segsiz, int *capped, uint64_t *rate_wanted, uint8_t non_paced)
14801 uint64_t lentim, fill_bw;
14803 /* Lets first see if we are full, if so continue with normal rate */
14804 rack->r_via_fill_cw = 0;
14805 if (ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked) > rack->r_ctl.cwnd_to_use)
14807 if ((ctf_outstanding(rack->rc_tp) + (segsiz-1)) > rack->rc_tp->snd_wnd)
14809 if (rack->r_ctl.rc_last_us_rtt == 0)
14811 if (rack->rc_pace_fill_if_rttin_range &&
14812 (rack->r_ctl.rc_last_us_rtt >=
14813 (get_filter_value_small(&rack->r_ctl.rc_gp_min_rtt) * rack->rtt_limit_mul))) {
14814 /* The rtt is huge, N * smallest, lets not fill */
14818 * first lets calculate the b/w based on the last us-rtt
14821 fill_bw = rack->r_ctl.cwnd_to_use;
14822 /* Take the rwnd if its smaller */
14823 if (fill_bw > rack->rc_tp->snd_wnd)
14824 fill_bw = rack->rc_tp->snd_wnd;
14825 if (rack->r_fill_less_agg) {
14827 * Now take away the inflight (this will reduce our
14828 * aggressiveness and yeah, if we get that much out in 1RTT
14829 * we will have had acks come back and still be behind).
14831 fill_bw -= ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
14833 /* Now lets make it into a b/w */
14834 fill_bw *= (uint64_t)HPTS_USEC_IN_SEC;
14835 fill_bw /= (uint64_t)rack->r_ctl.rc_last_us_rtt;
14836 /* We are below the min b/w */
14838 *rate_wanted = fill_bw;
14839 if ((fill_bw < RACK_MIN_BW) || (fill_bw < *rate_wanted))
14841 if (rack->r_ctl.bw_rate_cap && (fill_bw > rack->r_ctl.bw_rate_cap))
14842 fill_bw = rack->r_ctl.bw_rate_cap;
14843 rack->r_via_fill_cw = 1;
14844 if (rack->r_rack_hw_rate_caps &&
14845 (rack->r_ctl.crte != NULL)) {
14846 uint64_t high_rate;
14848 high_rate = tcp_hw_highest_rate(rack->r_ctl.crte);
14849 if (fill_bw > high_rate) {
14850 /* We are capping bw at the highest rate table entry */
14851 if (*rate_wanted > high_rate) {
14852 /* The original rate was also capped */
14853 rack->r_via_fill_cw = 0;
14855 rack_log_hdwr_pacing(rack,
14856 fill_bw, high_rate, __LINE__,
14858 fill_bw = high_rate;
14862 } else if ((rack->r_ctl.crte == NULL) &&
14863 (rack->rack_hdrw_pacing == 0) &&
14864 (rack->rack_hdw_pace_ena) &&
14865 rack->r_rack_hw_rate_caps &&
14866 (rack->rack_attempt_hdwr_pace == 0) &&
14867 (rack->rc_inp->inp_route.ro_nh != NULL) &&
14868 (rack->rc_inp->inp_route.ro_nh->nh_ifp != NULL)) {
14870 * Ok we may have a first attempt that is greater than our top rate
14873 uint64_t high_rate;
14875 high_rate = tcp_hw_highest_rate_ifp(rack->rc_inp->inp_route.ro_nh->nh_ifp, rack->rc_inp);
14877 if (fill_bw > high_rate) {
14878 fill_bw = high_rate;
14885 * Ok fill_bw holds our mythical b/w to fill the cwnd
14886 * in a rtt, what does that time wise equate too?
14888 lentim = (uint64_t)(len) * (uint64_t)HPTS_USEC_IN_SEC;
14890 *rate_wanted = fill_bw;
14891 if (non_paced || (lentim < slot)) {
14892 rack_log_pacing_delay_calc(rack, len, slot, fill_bw,
14893 0, lentim, 12, __LINE__, NULL, 0);
14894 return ((int32_t)lentim);
14900 rack_get_pacing_delay(struct tcp_rack *rack, struct tcpcb *tp, uint32_t len, struct rack_sendmap *rsm, uint32_t segsiz)
14904 int can_start_hw_pacing = 1;
14907 if (rack->rc_always_pace == 0) {
14909 * We use the most optimistic possible cwnd/srtt for
14910 * sending calculations. This will make our
14911 * calculation anticipate getting more through
14912 * quicker then possible. But thats ok we don't want
14913 * the peer to have a gap in data sending.
14915 uint64_t cwnd, tr_perms = 0;
14916 int32_t reduce = 0;
14920 * We keep no precise pacing with the old method
14921 * instead we use the pacer to mitigate bursts.
14923 if (rack->r_ctl.rc_rack_min_rtt)
14924 srtt = rack->r_ctl.rc_rack_min_rtt;
14926 srtt = max(tp->t_srtt, 1);
14927 if (rack->r_ctl.rc_rack_largest_cwnd)
14928 cwnd = rack->r_ctl.rc_rack_largest_cwnd;
14930 cwnd = rack->r_ctl.cwnd_to_use;
14931 /* Inflate cwnd by 1000 so srtt of usecs is in ms */
14932 tr_perms = (cwnd * 1000) / srtt;
14933 if (tr_perms == 0) {
14934 tr_perms = ctf_fixed_maxseg(tp);
14937 * Calculate how long this will take to drain, if
14938 * the calculation comes out to zero, thats ok we
14939 * will use send_a_lot to possibly spin around for
14940 * more increasing tot_len_this_send to the point
14941 * that its going to require a pace, or we hit the
14942 * cwnd. Which in that case we are just waiting for
14945 slot = len / tr_perms;
14946 /* Now do we reduce the time so we don't run dry? */
14947 if (slot && rack_slot_reduction) {
14948 reduce = (slot / rack_slot_reduction);
14949 if (reduce < slot) {
14954 slot *= HPTS_USEC_IN_MSEC;
14955 if (rack->rc_pace_to_cwnd) {
14956 uint64_t rate_wanted = 0;
14958 slot = pace_to_fill_cwnd(rack, slot, len, segsiz, NULL, &rate_wanted, 1);
14959 rack->rc_ack_can_sendout_data = 1;
14960 rack_log_pacing_delay_calc(rack, len, slot, rate_wanted, 0, 0, 14, __LINE__, NULL, 0);
14962 rack_log_pacing_delay_calc(rack, len, slot, tr_perms, reduce, 0, 7, __LINE__, NULL, 0);
14964 uint64_t bw_est, res, lentim, rate_wanted;
14965 uint32_t orig_val, segs, oh;
14969 if ((rack->r_rr_config == 1) && rsm) {
14970 return (rack->r_ctl.rc_min_to);
14972 if (rack->use_fixed_rate) {
14973 rate_wanted = bw_est = rack_get_fixed_pacing_bw(rack);
14974 } else if ((rack->r_ctl.init_rate == 0) &&
14975 #ifdef NETFLIX_PEAKRATE
14976 (rack->rc_tp->t_maxpeakrate == 0) &&
14978 (rack->r_ctl.gp_bw == 0)) {
14979 /* no way to yet do an estimate */
14980 bw_est = rate_wanted = 0;
14982 bw_est = rack_get_bw(rack);
14983 rate_wanted = rack_get_output_bw(rack, bw_est, rsm, &capped);
14985 if ((bw_est == 0) || (rate_wanted == 0) ||
14986 ((rack->gp_ready == 0) && (rack->use_fixed_rate == 0))) {
14988 * No way yet to make a b/w estimate or
14989 * our raise is set incorrectly.
14993 /* We need to account for all the overheads */
14994 segs = (len + segsiz - 1) / segsiz;
14996 * We need the diff between 1514 bytes (e-mtu with e-hdr)
14997 * and how much data we put in each packet. Yes this
14998 * means we may be off if we are larger than 1500 bytes
14999 * or smaller. But this just makes us more conservative.
15001 if (rack_hw_rate_min &&
15002 (bw_est < rack_hw_rate_min))
15003 can_start_hw_pacing = 0;
15004 if (ETHERNET_SEGMENT_SIZE > segsiz)
15005 oh = ETHERNET_SEGMENT_SIZE - segsiz;
15009 lentim = (uint64_t)(len + segs) * (uint64_t)HPTS_USEC_IN_SEC;
15010 res = lentim / rate_wanted;
15011 slot = (uint32_t)res;
15012 orig_val = rack->r_ctl.rc_pace_max_segs;
15013 if (rack->r_ctl.crte == NULL) {
15015 * Only do this if we are not hardware pacing
15016 * since if we are doing hw-pacing below we will
15017 * set make a call after setting up or changing
15020 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
15021 } else if (rack->rc_inp->inp_snd_tag == NULL) {
15023 * We lost our rate somehow, this can happen
15024 * if the interface changed underneath us.
15026 tcp_rel_pacing_rate(rack->r_ctl.crte, rack->rc_tp);
15027 rack->r_ctl.crte = NULL;
15028 /* Lets re-allow attempting to setup pacing */
15029 rack->rack_hdrw_pacing = 0;
15030 rack->rack_attempt_hdwr_pace = 0;
15031 rack_log_hdwr_pacing(rack,
15032 rate_wanted, bw_est, __LINE__,
15035 /* Did we change the TSO size, if so log it */
15036 if (rack->r_ctl.rc_pace_max_segs != orig_val)
15037 rack_log_pacing_delay_calc(rack, len, slot, orig_val, 0, 0, 15, __LINE__, NULL, 0);
15038 prev_fill = rack->r_via_fill_cw;
15039 if ((rack->rc_pace_to_cwnd) &&
15041 (rack->use_fixed_rate == 0) &&
15042 (rack->in_probe_rtt == 0) &&
15043 (IN_FASTRECOVERY(rack->rc_tp->t_flags) == 0)) {
15045 * We want to pace at our rate *or* faster to
15046 * fill the cwnd to the max if its not full.
15048 slot = pace_to_fill_cwnd(rack, slot, (len+segs), segsiz, &capped, &rate_wanted, 0);
15050 if ((rack->rc_inp->inp_route.ro_nh != NULL) &&
15051 (rack->rc_inp->inp_route.ro_nh->nh_ifp != NULL)) {
15052 if ((rack->rack_hdw_pace_ena) &&
15053 (can_start_hw_pacing > 0) &&
15054 (rack->rack_hdrw_pacing == 0) &&
15055 (rack->rack_attempt_hdwr_pace == 0)) {
15057 * Lets attempt to turn on hardware pacing
15060 rack->rack_attempt_hdwr_pace = 1;
15061 rack->r_ctl.crte = tcp_set_pacing_rate(rack->rc_tp,
15062 rack->rc_inp->inp_route.ro_nh->nh_ifp,
15065 &err, &rack->r_ctl.crte_prev_rate);
15066 if (rack->r_ctl.crte) {
15067 rack->rack_hdrw_pacing = 1;
15068 rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size(tp, rate_wanted, segsiz,
15069 0, rack->r_ctl.crte,
15071 rack_log_hdwr_pacing(rack,
15072 rate_wanted, rack->r_ctl.crte->rate, __LINE__,
15074 rack->r_ctl.last_hw_bw_req = rate_wanted;
15076 counter_u64_add(rack_hw_pace_init_fail, 1);
15078 } else if (rack->rack_hdrw_pacing &&
15079 (rack->r_ctl.last_hw_bw_req != rate_wanted)) {
15080 /* Do we need to adjust our rate? */
15081 const struct tcp_hwrate_limit_table *nrte;
15083 if (rack->r_up_only &&
15084 (rate_wanted < rack->r_ctl.crte->rate)) {
15086 * We have four possible states here
15087 * having to do with the previous time
15089 * previous | this-time
15090 * A) 0 | 0 -- fill_cw not in the picture
15091 * B) 1 | 0 -- we were doing a fill-cw but now are not
15092 * C) 1 | 1 -- all rates from fill_cw
15093 * D) 0 | 1 -- we were doing non-fill and now we are filling
15095 * For case A, C and D we don't allow a drop. But for
15096 * case B where we now our on our steady rate we do
15100 if (!((prev_fill == 1) && (rack->r_via_fill_cw == 0)))
15103 if ((rate_wanted > rack->r_ctl.crte->rate) ||
15104 (rate_wanted <= rack->r_ctl.crte_prev_rate)) {
15105 if (rack_hw_rate_to_low &&
15106 (bw_est < rack_hw_rate_to_low)) {
15108 * The pacing rate is too low for hardware, but
15109 * do allow hardware pacing to be restarted.
15111 rack_log_hdwr_pacing(rack,
15112 bw_est, rack->r_ctl.crte->rate, __LINE__,
15114 tcp_rel_pacing_rate(rack->r_ctl.crte, rack->rc_tp);
15115 rack->r_ctl.crte = NULL;
15116 rack->rack_attempt_hdwr_pace = 0;
15117 rack->rack_hdrw_pacing = 0;
15118 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, &rate_wanted);
15121 nrte = tcp_chg_pacing_rate(rack->r_ctl.crte,
15123 rack->rc_inp->inp_route.ro_nh->nh_ifp,
15126 &err, &rack->r_ctl.crte_prev_rate);
15127 if (nrte == NULL) {
15128 /* Lost the rate */
15129 rack->rack_hdrw_pacing = 0;
15130 rack->r_ctl.crte = NULL;
15131 rack_log_hdwr_pacing(rack,
15132 rate_wanted, 0, __LINE__,
15134 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, &rate_wanted);
15135 counter_u64_add(rack_hw_pace_lost, 1);
15136 } else if (nrte != rack->r_ctl.crte) {
15137 rack->r_ctl.crte = nrte;
15138 rack->r_ctl.rc_pace_max_segs = tcp_get_pacing_burst_size(tp, rate_wanted,
15142 rack_log_hdwr_pacing(rack,
15143 rate_wanted, rack->r_ctl.crte->rate, __LINE__,
15145 rack->r_ctl.last_hw_bw_req = rate_wanted;
15148 /* We just need to adjust the segment size */
15149 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, &rate_wanted);
15150 rack_log_hdwr_pacing(rack,
15151 rate_wanted, rack->r_ctl.crte->rate, __LINE__,
15153 rack->r_ctl.last_hw_bw_req = rate_wanted;
15157 if ((rack->r_ctl.crte != NULL) &&
15158 (rack->r_ctl.crte->rate == rate_wanted)) {
15160 * We need to add a extra if the rates
15161 * are exactly matched. The idea is
15162 * we want the software to make sure the
15163 * queue is empty before adding more, this
15164 * gives us N MSS extra pace times where
15167 slot += (rack->r_ctl.crte->time_between * rack_hw_pace_extra_slots);
15170 if (rack_limit_time_with_srtt &&
15171 (rack->use_fixed_rate == 0) &&
15172 #ifdef NETFLIX_PEAKRATE
15173 (rack->rc_tp->t_maxpeakrate == 0) &&
15175 (rack->rack_hdrw_pacing == 0)) {
15177 * Sanity check, we do not allow the pacing delay
15178 * to be longer than the SRTT of the path. If it is
15179 * a slow path, then adding a packet should increase
15180 * the RTT and compensate for this i.e. the srtt will
15181 * be greater so the allowed pacing time will be greater.
15183 * Note this restriction is not for where a peak rate
15184 * is set, we are doing fixed pacing or hardware pacing.
15186 if (rack->rc_tp->t_srtt)
15187 srtt = rack->rc_tp->t_srtt;
15189 srtt = RACK_INITIAL_RTO * HPTS_USEC_IN_MSEC; /* its in ms convert */
15190 if (srtt < (uint64_t)slot) {
15191 rack_log_pacing_delay_calc(rack, srtt, slot, rate_wanted, bw_est, lentim, 99, __LINE__, NULL, 0);
15195 rack_log_pacing_delay_calc(rack, len, slot, rate_wanted, bw_est, lentim, 2, __LINE__, rsm, 0);
15197 if (rack->r_ctl.crte && (rack->r_ctl.crte->rs_num_enobufs > 0)) {
15199 * If this rate is seeing enobufs when it
15200 * goes to send then either the nic is out
15201 * of gas or we are mis-estimating the time
15202 * somehow and not letting the queue empty
15203 * completely. Lets add to the pacing time.
15205 int hw_boost_delay;
15207 hw_boost_delay = rack->r_ctl.crte->time_between * rack_enobuf_hw_boost_mult;
15208 if (hw_boost_delay > rack_enobuf_hw_max)
15209 hw_boost_delay = rack_enobuf_hw_max;
15210 else if (hw_boost_delay < rack_enobuf_hw_min)
15211 hw_boost_delay = rack_enobuf_hw_min;
15212 slot += hw_boost_delay;
15218 rack_start_gp_measurement(struct tcpcb *tp, struct tcp_rack *rack,
15219 tcp_seq startseq, uint32_t sb_offset)
15221 struct rack_sendmap *my_rsm = NULL;
15222 struct rack_sendmap fe;
15224 if (tp->t_state < TCPS_ESTABLISHED) {
15226 * We don't start any measurements if we are
15227 * not at least established.
15231 if (tp->t_state >= TCPS_FIN_WAIT_1) {
15233 * We will get no more data into the SB
15234 * this means we need to have the data available
15235 * before we start a measurement.
15238 if (sbavail(&tptosocket(tp)->so_snd) <
15239 max(rc_init_window(rack),
15240 (MIN_GP_WIN * ctf_fixed_maxseg(tp)))) {
15241 /* Nope not enough data */
15245 tp->t_flags |= TF_GPUTINPROG;
15246 rack->r_ctl.rc_gp_lowrtt = 0xffffffff;
15247 rack->r_ctl.rc_gp_high_rwnd = rack->rc_tp->snd_wnd;
15248 tp->gput_seq = startseq;
15249 rack->app_limited_needs_set = 0;
15250 if (rack->in_probe_rtt)
15251 rack->measure_saw_probe_rtt = 1;
15252 else if ((rack->measure_saw_probe_rtt) &&
15253 (SEQ_GEQ(tp->gput_seq, rack->r_ctl.rc_probertt_sndmax_atexit)))
15254 rack->measure_saw_probe_rtt = 0;
15255 if (rack->rc_gp_filled)
15256 tp->gput_ts = tcp_tv_to_usectick(&rack->r_ctl.act_rcv_time);
15258 /* Special case initial measurement */
15261 tp->gput_ts = tcp_get_usecs(&tv);
15262 rack->r_ctl.rc_gp_output_ts = rack_to_usec_ts(&tv);
15265 * We take a guess out into the future,
15266 * if we have no measurement and no
15267 * initial rate, we measure the first
15268 * initial-windows worth of data to
15269 * speed up getting some GP measurement and
15270 * thus start pacing.
15272 if ((rack->rc_gp_filled == 0) && (rack->r_ctl.init_rate == 0)) {
15273 rack->app_limited_needs_set = 1;
15274 tp->gput_ack = startseq + max(rc_init_window(rack),
15275 (MIN_GP_WIN * ctf_fixed_maxseg(tp)));
15276 rack_log_pacing_delay_calc(rack,
15281 rack->r_ctl.rc_app_limited_cnt,
15283 __LINE__, NULL, 0);
15288 * We are out somewhere in the sb
15289 * can we use the already outstanding data?
15291 if (rack->r_ctl.rc_app_limited_cnt == 0) {
15293 * Yes first one is good and in this case
15294 * the tp->gput_ts is correctly set based on
15295 * the last ack that arrived (no need to
15296 * set things up when an ack comes in).
15298 my_rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
15299 if ((my_rsm == NULL) ||
15300 (my_rsm->r_rtr_cnt != 1)) {
15301 /* retransmission? */
15305 if (rack->r_ctl.rc_first_appl == NULL) {
15307 * If rc_first_appl is NULL
15308 * then the cnt should be 0.
15309 * This is probably an error, maybe
15310 * a KASSERT would be approprate.
15315 * If we have a marker pointer to the last one that is
15316 * app limited we can use that, but we need to set
15317 * things up so that when it gets ack'ed we record
15318 * the ack time (if its not already acked).
15320 rack->app_limited_needs_set = 1;
15322 * We want to get to the rsm that is either
15323 * next with space i.e. over 1 MSS or the one
15324 * after that (after the app-limited).
15326 my_rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree,
15327 rack->r_ctl.rc_first_appl);
15329 if ((my_rsm->r_end - my_rsm->r_start) <= ctf_fixed_maxseg(tp))
15330 /* Have to use the next one */
15331 my_rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree,
15334 /* Use after the first MSS of it is acked */
15335 tp->gput_seq = my_rsm->r_start + ctf_fixed_maxseg(tp);
15339 if ((my_rsm == NULL) ||
15340 (my_rsm->r_rtr_cnt != 1)) {
15342 * Either its a retransmit or
15343 * the last is the app-limited one.
15348 tp->gput_seq = my_rsm->r_start;
15350 if (my_rsm->r_flags & RACK_ACKED) {
15352 * This one has been acked use the arrival ack time
15354 tp->gput_ts = (uint32_t)my_rsm->r_ack_arrival;
15355 rack->app_limited_needs_set = 0;
15357 rack->r_ctl.rc_gp_output_ts = my_rsm->r_tim_lastsent[(my_rsm->r_rtr_cnt-1)];
15358 tp->gput_ack = tp->gput_seq + rack_get_measure_window(tp, rack);
15359 rack_log_pacing_delay_calc(rack,
15364 rack->r_ctl.rc_app_limited_cnt,
15366 __LINE__, NULL, 0);
15372 * We don't know how long we may have been
15373 * idle or if this is the first-send. Lets
15374 * setup the flag so we will trim off
15375 * the first ack'd data so we get a true
15378 rack->app_limited_needs_set = 1;
15379 tp->gput_ack = startseq + rack_get_measure_window(tp, rack);
15380 /* Find this guy so we can pull the send time */
15381 fe.r_start = startseq;
15382 my_rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
15384 rack->r_ctl.rc_gp_output_ts = my_rsm->r_tim_lastsent[(my_rsm->r_rtr_cnt-1)];
15385 if (my_rsm->r_flags & RACK_ACKED) {
15387 * Unlikely since its probably what was
15388 * just transmitted (but I am paranoid).
15390 tp->gput_ts = (uint32_t)my_rsm->r_ack_arrival;
15391 rack->app_limited_needs_set = 0;
15393 if (SEQ_LT(my_rsm->r_start, tp->gput_seq)) {
15394 /* This also is unlikely */
15395 tp->gput_seq = my_rsm->r_start;
15399 * TSNH unless we have some send-map limit,
15400 * and even at that it should not be hitting
15401 * that limit (we should have stopped sending).
15406 rack->r_ctl.rc_gp_output_ts = rack_to_usec_ts(&tv);
15408 rack_log_pacing_delay_calc(rack,
15413 rack->r_ctl.rc_app_limited_cnt,
15414 9, __LINE__, NULL, 0);
15417 static inline uint32_t
15418 rack_what_can_we_send(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cwnd_to_use,
15419 uint32_t avail, int32_t sb_offset)
15424 if (tp->snd_wnd > cwnd_to_use)
15425 sendwin = cwnd_to_use;
15427 sendwin = tp->snd_wnd;
15428 if (ctf_outstanding(tp) >= tp->snd_wnd) {
15429 /* We never want to go over our peers rcv-window */
15434 flight = ctf_flight_size(tp, rack->r_ctl.rc_sacked);
15435 if (flight >= sendwin) {
15437 * We have in flight what we are allowed by cwnd (if
15438 * it was rwnd blocking it would have hit above out
15443 len = sendwin - flight;
15444 if ((len + ctf_outstanding(tp)) > tp->snd_wnd) {
15445 /* We would send too much (beyond the rwnd) */
15446 len = tp->snd_wnd - ctf_outstanding(tp);
15448 if ((len + sb_offset) > avail) {
15450 * We don't have that much in the SB, how much is
15453 len = avail - sb_offset;
15460 rack_log_fsb(struct tcp_rack *rack, struct tcpcb *tp, struct socket *so, uint32_t flags,
15461 unsigned ipoptlen, int32_t orig_len, int32_t len, int error,
15462 int rsm_is_null, int optlen, int line, uint16_t mode)
15464 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
15465 union tcp_log_stackspecific log;
15468 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
15469 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
15470 log.u_bbr.flex1 = error;
15471 log.u_bbr.flex2 = flags;
15472 log.u_bbr.flex3 = rsm_is_null;
15473 log.u_bbr.flex4 = ipoptlen;
15474 log.u_bbr.flex5 = tp->rcv_numsacks;
15475 log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
15476 log.u_bbr.flex7 = optlen;
15477 log.u_bbr.flex8 = rack->r_fsb_inited;
15478 log.u_bbr.applimited = rack->r_fast_output;
15479 log.u_bbr.bw_inuse = rack_get_bw(rack);
15480 log.u_bbr.pacing_gain = rack_get_output_gain(rack, NULL);
15481 log.u_bbr.cwnd_gain = mode;
15482 log.u_bbr.pkts_out = orig_len;
15483 log.u_bbr.lt_epoch = len;
15484 log.u_bbr.delivered = line;
15485 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
15486 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
15487 tcp_log_event_(tp, NULL, &so->so_rcv, &so->so_snd, TCP_LOG_FSB, 0,
15488 len, &log, false, NULL, NULL, 0, &tv);
15493 static struct mbuf *
15494 rack_fo_base_copym(struct mbuf *the_m, uint32_t the_off, int32_t *plen,
15495 struct rack_fast_send_blk *fsb,
15496 int32_t seglimit, int32_t segsize, int hw_tls)
15499 struct ktls_session *tls, *ntls;
15501 struct mbuf *start;
15504 struct mbuf *m, *n, **np, *smb;
15507 int32_t len = *plen;
15509 int32_t len_cp = 0;
15510 uint32_t mlen, frags;
15512 soff = off = the_off;
15517 if (hw_tls && (m->m_flags & M_EXTPG))
15518 tls = m->m_epg_tls;
15532 if (m->m_flags & M_EXTPG)
15533 ntls = m->m_epg_tls;
15538 * Avoid mixing TLS records with handshake
15539 * data or TLS records from different
15549 mlen = min(len, m->m_len - off);
15552 * For M_EXTPG mbufs, add 3 segments
15553 * + 1 in case we are crossing page boundaries
15554 * + 2 in case the TLS hdr/trailer are used
15555 * It is cheaper to just add the segments
15556 * than it is to take the cache miss to look
15557 * at the mbuf ext_pgs state in detail.
15559 if (m->m_flags & M_EXTPG) {
15560 fragsize = min(segsize, PAGE_SIZE);
15563 fragsize = segsize;
15567 /* Break if we really can't fit anymore. */
15568 if ((frags + 1) >= seglimit) {
15574 * Reduce size if you can't copy the whole
15575 * mbuf. If we can't copy the whole mbuf, also
15576 * adjust len so the loop will end after this
15579 if ((frags + howmany(mlen, fragsize)) >= seglimit) {
15580 mlen = (seglimit - frags - 1) * fragsize;
15582 *plen = len_cp + len;
15584 frags += howmany(mlen, fragsize);
15588 KASSERT(seglimit > 0,
15589 ("%s: seglimit went too low", __func__));
15591 n = m_get(M_NOWAIT, m->m_type);
15597 len_cp += n->m_len;
15598 if (m->m_flags & (M_EXT|M_EXTPG)) {
15599 n->m_data = m->m_data + off;
15602 bcopy(mtod(m, caddr_t)+off, mtod(n, caddr_t),
15609 if (len || (soff == smb->m_len)) {
15611 * We have more so we move forward or
15612 * we have consumed the entire mbuf and
15613 * len has fell to 0.
15625 * Save off the size of the mbuf. We do
15626 * this so that we can recognize when it
15627 * has been trimmed by sbcut() as acks
15630 fsb->o_m_len = smb->m_len;
15633 * This is the case where the next mbuf went to NULL. This
15634 * means with this copy we have sent everything in the sb.
15635 * In theory we could clear the fast_output flag, but lets
15636 * not since its possible that we could get more added
15637 * and acks that call the extend function which would let
15652 * This is a copy of m_copym(), taking the TSO segment size/limit
15653 * constraints into account, and advancing the sndptr as it goes.
15655 static struct mbuf *
15656 rack_fo_m_copym(struct tcp_rack *rack, int32_t *plen,
15657 int32_t seglimit, int32_t segsize, struct mbuf **s_mb, int *s_soff)
15659 struct mbuf *m, *n;
15662 soff = rack->r_ctl.fsb.off;
15663 m = rack->r_ctl.fsb.m;
15664 if (rack->r_ctl.fsb.o_m_len > m->m_len) {
15666 * The mbuf had the front of it chopped off by an ack
15667 * we need to adjust the soff/off by that difference.
15671 delta = rack->r_ctl.fsb.o_m_len - m->m_len;
15673 } else if (rack->r_ctl.fsb.o_m_len < m->m_len) {
15675 * The mbuf was expanded probably by
15676 * a m_compress. Just update o_m_len.
15678 rack->r_ctl.fsb.o_m_len = m->m_len;
15680 KASSERT(soff >= 0, ("%s, negative off %d", __FUNCTION__, soff));
15681 KASSERT(*plen >= 0, ("%s, negative len %d", __FUNCTION__, *plen));
15682 KASSERT(soff < m->m_len, ("%s rack:%p len:%u m:%p m->m_len:%u < off?",
15684 rack, *plen, m, m->m_len));
15685 /* Save off the right location before we copy and advance */
15687 *s_mb = rack->r_ctl.fsb.m;
15688 n = rack_fo_base_copym(m, soff, plen,
15690 seglimit, segsize, rack->r_ctl.fsb.hw_tls);
15695 rack_fast_rsm_output(struct tcpcb *tp, struct tcp_rack *rack, struct rack_sendmap *rsm,
15696 uint64_t ts_val, uint32_t cts, uint32_t ms_cts, struct timeval *tv, int len, uint8_t doing_tlp)
15699 * Enter the fast retransmit path. We are given that a sched_pin is
15700 * in place (if accounting is compliled in) and the cycle count taken
15701 * at the entry is in the ts_val. The concept her is that the rsm
15702 * now holds the mbuf offsets and such so we can directly transmit
15703 * without a lot of overhead, the len field is already set for
15704 * us to prohibit us from sending too much (usually its 1MSS).
15706 struct ip *ip = NULL;
15707 struct udphdr *udp = NULL;
15708 struct tcphdr *th = NULL;
15709 struct mbuf *m = NULL;
15712 struct tcp_log_buffer *lgb;
15713 #ifdef TCP_ACCOUNTING
15718 u_char opt[TCP_MAXOLEN];
15719 uint32_t hdrlen, optlen;
15720 int32_t slot, segsiz, max_val, tso = 0, error, ulen = 0;
15722 uint32_t if_hw_tsomaxsegcount = 0, startseq;
15723 uint32_t if_hw_tsomaxsegsize;
15726 struct ip6_hdr *ip6 = NULL;
15728 if (rack->r_is_v6) {
15729 ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
15730 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
15734 ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
15735 hdrlen = sizeof(struct tcpiphdr);
15737 if (tp->t_port && (V_tcp_udp_tunneling_port == 0)) {
15741 /* Its a TLP add the flag, it may already be there but be sure */
15742 rsm->r_flags |= RACK_TLP;
15744 /* If it was a TLP it is not not on this retransmit */
15745 rsm->r_flags &= ~RACK_TLP;
15747 startseq = rsm->r_start;
15748 segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
15749 inp = rack->rc_inp;
15751 flags = tcp_outflags[tp->t_state];
15752 if (flags & (TH_SYN|TH_RST)) {
15755 if (rsm->r_flags & RACK_HAS_FIN) {
15756 /* We can't send a FIN here */
15759 if (flags & TH_FIN) {
15760 /* We never send a FIN */
15763 if (tp->t_flags & TF_RCVD_TSTMP) {
15764 to.to_tsval = ms_cts + tp->ts_offset;
15765 to.to_tsecr = tp->ts_recent;
15766 to.to_flags = TOF_TS;
15768 optlen = tcp_addoptions(&to, opt);
15770 udp = rack->r_ctl.fsb.udp;
15772 hdrlen += sizeof(struct udphdr);
15773 if (rack->r_ctl.rc_pace_max_segs)
15774 max_val = rack->r_ctl.rc_pace_max_segs;
15775 else if (rack->rc_user_set_max_segs)
15776 max_val = rack->rc_user_set_max_segs * segsiz;
15779 if ((tp->t_flags & TF_TSO) &&
15785 if (MHLEN < hdrlen + max_linkhdr)
15786 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
15789 m = m_gethdr(M_NOWAIT, MT_DATA);
15792 m->m_data += max_linkhdr;
15794 th = rack->r_ctl.fsb.th;
15795 /* Establish the len to send */
15798 if ((tso) && (len + optlen > tp->t_maxseg)) {
15799 uint32_t if_hw_tsomax;
15802 /* extract TSO information */
15803 if_hw_tsomax = tp->t_tsomax;
15804 if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
15805 if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
15807 * Check if we should limit by maximum payload
15810 if (if_hw_tsomax != 0) {
15811 /* compute maximum TSO length */
15812 max_len = (if_hw_tsomax - hdrlen -
15814 if (max_len <= 0) {
15816 } else if (len > max_len) {
15820 if (len <= segsiz) {
15822 * In case there are too many small fragments don't
15830 if ((tso == 0) && (len > segsiz))
15833 (len <= MHLEN - hdrlen - max_linkhdr)) {
15836 th->th_seq = htonl(rsm->r_start);
15837 th->th_ack = htonl(tp->rcv_nxt);
15839 * The PUSH bit should only be applied
15840 * if the full retransmission is made. If
15841 * we are sending less than this is the
15842 * left hand edge and should not have
15845 if ((rsm->r_flags & RACK_HAD_PUSH) &&
15846 (len == (rsm->r_end - rsm->r_start)))
15848 th->th_win = htons((u_short)(rack->r_ctl.fsb.recwin >> tp->rcv_scale));
15849 if (th->th_win == 0) {
15850 tp->t_sndzerowin++;
15851 tp->t_flags |= TF_RXWIN0SENT;
15853 tp->t_flags &= ~TF_RXWIN0SENT;
15854 if (rsm->r_flags & RACK_TLP) {
15856 * TLP should not count in retran count, but
15859 counter_u64_add(rack_tlp_retran, 1);
15860 counter_u64_add(rack_tlp_retran_bytes, len);
15862 tp->t_sndrexmitpack++;
15863 KMOD_TCPSTAT_INC(tcps_sndrexmitpack);
15864 KMOD_TCPSTAT_ADD(tcps_sndrexmitbyte, len);
15867 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB,
15870 if (rsm->m == NULL)
15872 if (rsm->orig_m_len != rsm->m->m_len) {
15873 /* Fix up the orig_m_len and possibly the mbuf offset */
15874 rack_adjust_orig_mlen(rsm);
15876 m->m_next = rack_fo_base_copym(rsm->m, rsm->soff, &len, NULL, if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, rsm->r_hw_tls);
15877 if (len <= segsiz) {
15879 * Must have ran out of mbufs for the copy
15880 * shorten it to no longer need tso. Lets
15881 * not put on sendalot since we are low on
15886 if ((m->m_next == NULL) || (len <= 0)){
15891 ulen = hdrlen + len - sizeof(struct ip6_hdr);
15893 ulen = hdrlen + len - sizeof(struct ip);
15894 udp->uh_ulen = htons(ulen);
15896 m->m_pkthdr.rcvif = (struct ifnet *)0;
15897 if (TCPS_HAVERCVDSYN(tp->t_state) &&
15898 (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
15899 int ect = tcp_ecn_output_established(tp, &flags, len, true);
15900 if ((tp->t_state == TCPS_SYN_RECEIVED) &&
15901 (tp->t_flags2 & TF2_ECN_SND_ECE))
15902 tp->t_flags2 &= ~TF2_ECN_SND_ECE;
15904 if (rack->r_is_v6) {
15905 ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << 20);
15906 ip6->ip6_flow |= htonl(ect << 20);
15911 ip->ip_tos &= ~IPTOS_ECN_MASK;
15915 tcp_set_flags(th, flags);
15916 m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */
15918 if (rack->r_is_v6) {
15920 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
15921 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
15922 udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
15923 th->th_sum = htons(0);
15924 UDPSTAT_INC(udps_opackets);
15926 m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
15927 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
15928 th->th_sum = in6_cksum_pseudo(ip6,
15929 sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
15934 #if defined(INET6) && defined(INET)
15940 m->m_pkthdr.csum_flags = CSUM_UDP;
15941 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
15942 udp->uh_sum = in_pseudo(ip->ip_src.s_addr,
15943 ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
15944 th->th_sum = htons(0);
15945 UDPSTAT_INC(udps_opackets);
15947 m->m_pkthdr.csum_flags = CSUM_TCP;
15948 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
15949 th->th_sum = in_pseudo(ip->ip_src.s_addr,
15950 ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
15951 IPPROTO_TCP + len + optlen));
15953 /* IP version must be set here for ipv4/ipv6 checking later */
15954 KASSERT(ip->ip_v == IPVERSION,
15955 ("%s: IP version incorrect: %d", __func__, ip->ip_v));
15959 KASSERT(len > tp->t_maxseg - optlen,
15960 ("%s: len <= tso_segsz tp:%p", __func__, tp));
15961 m->m_pkthdr.csum_flags |= CSUM_TSO;
15962 m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen;
15965 if (rack->r_is_v6) {
15966 ip6->ip6_hlim = rack->r_ctl.fsb.hoplimit;
15967 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
15968 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss)
15969 tp->t_flags2 |= TF2_PLPMTU_PMTUD;
15971 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
15974 #if defined(INET) && defined(INET6)
15979 ip->ip_len = htons(m->m_pkthdr.len);
15980 ip->ip_ttl = rack->r_ctl.fsb.hoplimit;
15981 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) {
15982 tp->t_flags2 |= TF2_PLPMTU_PMTUD;
15983 if (tp->t_port == 0 || len < V_tcp_minmss) {
15984 ip->ip_off |= htons(IP_DF);
15987 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
15991 /* Time to copy in our header */
15992 cpto = mtod(m, uint8_t *);
15993 memcpy(cpto, rack->r_ctl.fsb.tcp_ip_hdr, rack->r_ctl.fsb.tcp_ip_hdr_len);
15994 th = (struct tcphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.th - rack->r_ctl.fsb.tcp_ip_hdr));
15996 bcopy(opt, th + 1, optlen);
15997 th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
15999 th->th_off = sizeof(struct tcphdr) >> 2;
16001 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
16002 union tcp_log_stackspecific log;
16004 if (rsm->r_flags & RACK_RWND_COLLAPSED) {
16005 rack_log_collapse(rack, rsm->r_start, rsm->r_end, 0, __LINE__, 5, rsm->r_flags, rsm);
16006 counter_u64_add(rack_collapsed_win_rxt, 1);
16007 counter_u64_add(rack_collapsed_win_rxt_bytes, (rsm->r_end - rsm->r_start));
16009 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
16010 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
16011 if (rack->rack_no_prr)
16012 log.u_bbr.flex1 = 0;
16014 log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
16015 log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs;
16016 log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
16017 log.u_bbr.flex4 = max_val;
16018 log.u_bbr.flex5 = 0;
16019 /* Save off the early/late values */
16020 log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
16021 log.u_bbr.applimited = rack->r_ctl.rc_agg_delayed;
16022 log.u_bbr.bw_inuse = rack_get_bw(rack);
16023 if (doing_tlp == 0)
16024 log.u_bbr.flex8 = 1;
16026 log.u_bbr.flex8 = 2;
16027 log.u_bbr.pacing_gain = rack_get_output_gain(rack, NULL);
16028 log.u_bbr.flex7 = 55;
16029 log.u_bbr.pkts_out = tp->t_maxseg;
16030 log.u_bbr.timeStamp = cts;
16031 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
16032 log.u_bbr.lt_epoch = rack->r_ctl.cwnd_to_use;
16033 log.u_bbr.delivered = 0;
16034 lgb = tcp_log_event_(tp, th, NULL, NULL, TCP_LOG_OUT, ERRNO_UNK,
16035 len, &log, false, NULL, NULL, 0, tv);
16039 if (rack->r_is_v6) {
16040 error = ip6_output(m, NULL,
16042 0, NULL, NULL, inp);
16045 #if defined(INET) && defined(INET6)
16050 error = ip_output(m, NULL,
16057 lgb->tlb_errno = error;
16063 rack_log_output(tp, &to, len, rsm->r_start, flags, error, rack_to_usec_ts(tv),
16064 rsm, RACK_SENT_FP, rsm->m, rsm->soff, rsm->r_hw_tls);
16065 if (doing_tlp && (rack->fast_rsm_hack == 0)) {
16066 rack->rc_tlp_in_progress = 1;
16067 rack->r_ctl.rc_tlp_cnt_out++;
16070 tcp_account_for_send(tp, len, 1, doing_tlp, rsm->r_hw_tls);
16072 rack->rc_last_sent_tlp_past_cumack = 0;
16073 rack->rc_last_sent_tlp_seq_valid = 1;
16074 rack->r_ctl.last_sent_tlp_seq = rsm->r_start;
16075 rack->r_ctl.last_sent_tlp_len = rsm->r_end - rsm->r_start;
16078 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
16079 rack->forced_ack = 0; /* If we send something zap the FA flag */
16080 if (IN_FASTRECOVERY(tp->t_flags) && rsm)
16081 rack->r_ctl.retran_during_recovery += len;
16085 idx = (len / segsiz) + 3;
16086 if (idx >= TCP_MSS_ACCT_ATIMER)
16087 counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
16089 counter_u64_add(rack_out_size[idx], 1);
16091 if (tp->t_rtttime == 0) {
16092 tp->t_rtttime = ticks;
16093 tp->t_rtseq = startseq;
16094 KMOD_TCPSTAT_INC(tcps_segstimed);
16096 counter_u64_add(rack_fto_rsm_send, 1);
16097 if (error && (error == ENOBUFS)) {
16098 if (rack->r_ctl.crte != NULL) {
16099 rack_trace_point(rack, RACK_TP_HWENOBUF);
16101 rack_trace_point(rack, RACK_TP_ENOBUF);
16102 slot = ((1 + rack->rc_enobuf) * HPTS_USEC_IN_MSEC);
16103 if (rack->rc_enobuf < 0x7f)
16105 if (slot < (10 * HPTS_USEC_IN_MSEC))
16106 slot = 10 * HPTS_USEC_IN_MSEC;
16108 slot = rack_get_pacing_delay(rack, tp, len, NULL, segsiz);
16110 (rack->rc_always_pace == 0) ||
16111 (rack->r_rr_config == 1)) {
16113 * We have no pacing set or we
16114 * are using old-style rack or
16115 * we are overridden to use the old 1ms pacing.
16117 slot = rack->r_ctl.rc_min_to;
16119 rack_start_hpts_timer(rack, tp, cts, slot, len, 0);
16120 #ifdef TCP_ACCOUNTING
16121 crtsc = get_cyclecount();
16122 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16123 tp->tcp_cnt_counters[SND_OUT_DATA] += cnt_thru;
16125 counter_u64_add(tcp_cnt_counters[SND_OUT_DATA], cnt_thru);
16126 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16127 tp->tcp_proc_time[SND_OUT_DATA] += (crtsc - ts_val);
16129 counter_u64_add(tcp_proc_time[SND_OUT_DATA], (crtsc - ts_val));
16130 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16131 tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((len + segsiz - 1) / segsiz);
16133 counter_u64_add(tcp_cnt_counters[CNT_OF_MSS_OUT], ((len + segsiz - 1) / segsiz));
16144 rack_sndbuf_autoscale(struct tcp_rack *rack)
16147 * Automatic sizing of send socket buffer. Often the send buffer
16148 * size is not optimally adjusted to the actual network conditions
16149 * at hand (delay bandwidth product). Setting the buffer size too
16150 * small limits throughput on links with high bandwidth and high
16151 * delay (eg. trans-continental/oceanic links). Setting the
16152 * buffer size too big consumes too much real kernel memory,
16153 * especially with many connections on busy servers.
16155 * The criteria to step up the send buffer one notch are:
16156 * 1. receive window of remote host is larger than send buffer
16157 * (with a fudge factor of 5/4th);
16158 * 2. send buffer is filled to 7/8th with data (so we actually
16159 * have data to make use of it);
16160 * 3. send buffer fill has not hit maximal automatic size;
16161 * 4. our send window (slow start and cogestion controlled) is
16162 * larger than sent but unacknowledged data in send buffer.
16164 * Note that the rack version moves things much faster since
16165 * we want to avoid hitting cache lines in the rack_fast_output()
16166 * path so this is called much less often and thus moves
16167 * the SB forward by a percentage.
16171 uint32_t sendwin, scaleup;
16174 so = rack->rc_inp->inp_socket;
16175 sendwin = min(rack->r_ctl.cwnd_to_use, tp->snd_wnd);
16176 if (V_tcp_do_autosndbuf && so->so_snd.sb_flags & SB_AUTOSIZE) {
16177 if ((tp->snd_wnd / 4 * 5) >= so->so_snd.sb_hiwat &&
16178 sbused(&so->so_snd) >=
16179 (so->so_snd.sb_hiwat / 8 * 7) &&
16180 sbused(&so->so_snd) < V_tcp_autosndbuf_max &&
16181 sendwin >= (sbused(&so->so_snd) -
16182 (tp->snd_nxt - tp->snd_una))) {
16183 if (rack_autosndbuf_inc)
16184 scaleup = (rack_autosndbuf_inc * so->so_snd.sb_hiwat) / 100;
16186 scaleup = V_tcp_autosndbuf_inc;
16187 if (scaleup < V_tcp_autosndbuf_inc)
16188 scaleup = V_tcp_autosndbuf_inc;
16189 scaleup += so->so_snd.sb_hiwat;
16190 if (scaleup > V_tcp_autosndbuf_max)
16191 scaleup = V_tcp_autosndbuf_max;
16192 if (!sbreserve_locked(so, SO_SND, scaleup, curthread))
16193 so->so_snd.sb_flags &= ~SB_AUTOSIZE;
16199 rack_fast_output(struct tcpcb *tp, struct tcp_rack *rack, uint64_t ts_val,
16200 uint32_t cts, uint32_t ms_cts, struct timeval *tv, long tot_len, int *send_err)
16203 * Enter to do fast output. We are given that the sched_pin is
16204 * in place (if accounting is compiled in) and the cycle count taken
16205 * at entry is in place in ts_val. The idea here is that
16206 * we know how many more bytes needs to be sent (presumably either
16207 * during pacing or to fill the cwnd and that was greater than
16208 * the max-burst). We have how much to send and all the info we
16209 * need to just send.
16211 struct ip *ip = NULL;
16212 struct udphdr *udp = NULL;
16213 struct tcphdr *th = NULL;
16214 struct mbuf *m, *s_mb;
16217 struct tcp_log_buffer *lgb;
16218 #ifdef TCP_ACCOUNTING
16222 u_char opt[TCP_MAXOLEN];
16223 uint32_t hdrlen, optlen;
16224 #ifdef TCP_ACCOUNTING
16227 int32_t slot, segsiz, len, max_val, tso = 0, sb_offset, error, ulen = 0;
16230 uint32_t if_hw_tsomaxsegcount = 0, startseq;
16231 uint32_t if_hw_tsomaxsegsize;
16232 uint16_t add_flag = RACK_SENT_FP;
16234 struct ip6_hdr *ip6 = NULL;
16236 if (rack->r_is_v6) {
16237 ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
16238 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
16242 ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
16243 hdrlen = sizeof(struct tcpiphdr);
16245 if (tp->t_port && (V_tcp_udp_tunneling_port == 0)) {
16249 startseq = tp->snd_max;
16250 segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
16251 inp = rack->rc_inp;
16252 len = rack->r_ctl.fsb.left_to_send;
16254 flags = rack->r_ctl.fsb.tcp_flags;
16255 if (tp->t_flags & TF_RCVD_TSTMP) {
16256 to.to_tsval = ms_cts + tp->ts_offset;
16257 to.to_tsecr = tp->ts_recent;
16258 to.to_flags = TOF_TS;
16260 optlen = tcp_addoptions(&to, opt);
16262 udp = rack->r_ctl.fsb.udp;
16264 hdrlen += sizeof(struct udphdr);
16265 if (rack->r_ctl.rc_pace_max_segs)
16266 max_val = rack->r_ctl.rc_pace_max_segs;
16267 else if (rack->rc_user_set_max_segs)
16268 max_val = rack->rc_user_set_max_segs * segsiz;
16271 if ((tp->t_flags & TF_TSO) &&
16278 if (MHLEN < hdrlen + max_linkhdr)
16279 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
16282 m = m_gethdr(M_NOWAIT, MT_DATA);
16285 m->m_data += max_linkhdr;
16287 th = rack->r_ctl.fsb.th;
16288 /* Establish the len to send */
16291 if ((tso) && (len + optlen > tp->t_maxseg)) {
16292 uint32_t if_hw_tsomax;
16295 /* extract TSO information */
16296 if_hw_tsomax = tp->t_tsomax;
16297 if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
16298 if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
16300 * Check if we should limit by maximum payload
16303 if (if_hw_tsomax != 0) {
16304 /* compute maximum TSO length */
16305 max_len = (if_hw_tsomax - hdrlen -
16307 if (max_len <= 0) {
16309 } else if (len > max_len) {
16313 if (len <= segsiz) {
16315 * In case there are too many small fragments don't
16323 if ((tso == 0) && (len > segsiz))
16326 (len <= MHLEN - hdrlen - max_linkhdr)) {
16329 sb_offset = tp->snd_max - tp->snd_una;
16330 th->th_seq = htonl(tp->snd_max);
16331 th->th_ack = htonl(tp->rcv_nxt);
16332 th->th_win = htons((u_short)(rack->r_ctl.fsb.recwin >> tp->rcv_scale));
16333 if (th->th_win == 0) {
16334 tp->t_sndzerowin++;
16335 tp->t_flags |= TF_RXWIN0SENT;
16337 tp->t_flags &= ~TF_RXWIN0SENT;
16338 tp->snd_up = tp->snd_una; /* drag it along, its deprecated */
16339 KMOD_TCPSTAT_INC(tcps_sndpack);
16340 KMOD_TCPSTAT_ADD(tcps_sndbyte, len);
16342 stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB,
16345 if (rack->r_ctl.fsb.m == NULL)
16348 /* s_mb and s_soff are saved for rack_log_output */
16349 m->m_next = rack_fo_m_copym(rack, &len, if_hw_tsomaxsegcount, if_hw_tsomaxsegsize,
16351 if (len <= segsiz) {
16353 * Must have ran out of mbufs for the copy
16354 * shorten it to no longer need tso. Lets
16355 * not put on sendalot since we are low on
16360 if (rack->r_ctl.fsb.rfo_apply_push &&
16361 (len == rack->r_ctl.fsb.left_to_send)) {
16363 add_flag |= RACK_HAD_PUSH;
16365 if ((m->m_next == NULL) || (len <= 0)){
16370 ulen = hdrlen + len - sizeof(struct ip6_hdr);
16372 ulen = hdrlen + len - sizeof(struct ip);
16373 udp->uh_ulen = htons(ulen);
16375 m->m_pkthdr.rcvif = (struct ifnet *)0;
16376 if (TCPS_HAVERCVDSYN(tp->t_state) &&
16377 (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
16378 int ect = tcp_ecn_output_established(tp, &flags, len, false);
16379 if ((tp->t_state == TCPS_SYN_RECEIVED) &&
16380 (tp->t_flags2 & TF2_ECN_SND_ECE))
16381 tp->t_flags2 &= ~TF2_ECN_SND_ECE;
16383 if (rack->r_is_v6) {
16384 ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << 20);
16385 ip6->ip6_flow |= htonl(ect << 20);
16390 ip->ip_tos &= ~IPTOS_ECN_MASK;
16394 tcp_set_flags(th, flags);
16395 m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */
16397 if (rack->r_is_v6) {
16399 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
16400 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
16401 udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
16402 th->th_sum = htons(0);
16403 UDPSTAT_INC(udps_opackets);
16405 m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
16406 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
16407 th->th_sum = in6_cksum_pseudo(ip6,
16408 sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
16413 #if defined(INET6) && defined(INET)
16419 m->m_pkthdr.csum_flags = CSUM_UDP;
16420 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
16421 udp->uh_sum = in_pseudo(ip->ip_src.s_addr,
16422 ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
16423 th->th_sum = htons(0);
16424 UDPSTAT_INC(udps_opackets);
16426 m->m_pkthdr.csum_flags = CSUM_TCP;
16427 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
16428 th->th_sum = in_pseudo(ip->ip_src.s_addr,
16429 ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
16430 IPPROTO_TCP + len + optlen));
16432 /* IP version must be set here for ipv4/ipv6 checking later */
16433 KASSERT(ip->ip_v == IPVERSION,
16434 ("%s: IP version incorrect: %d", __func__, ip->ip_v));
16438 KASSERT(len > tp->t_maxseg - optlen,
16439 ("%s: len <= tso_segsz tp:%p", __func__, tp));
16440 m->m_pkthdr.csum_flags |= CSUM_TSO;
16441 m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen;
16444 if (rack->r_is_v6) {
16445 ip6->ip6_hlim = rack->r_ctl.fsb.hoplimit;
16446 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
16447 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss)
16448 tp->t_flags2 |= TF2_PLPMTU_PMTUD;
16450 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
16453 #if defined(INET) && defined(INET6)
16458 ip->ip_len = htons(m->m_pkthdr.len);
16459 ip->ip_ttl = rack->r_ctl.fsb.hoplimit;
16460 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) {
16461 tp->t_flags2 |= TF2_PLPMTU_PMTUD;
16462 if (tp->t_port == 0 || len < V_tcp_minmss) {
16463 ip->ip_off |= htons(IP_DF);
16466 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
16470 /* Time to copy in our header */
16471 cpto = mtod(m, uint8_t *);
16472 memcpy(cpto, rack->r_ctl.fsb.tcp_ip_hdr, rack->r_ctl.fsb.tcp_ip_hdr_len);
16473 th = (struct tcphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.th - rack->r_ctl.fsb.tcp_ip_hdr));
16475 bcopy(opt, th + 1, optlen);
16476 th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
16478 th->th_off = sizeof(struct tcphdr) >> 2;
16480 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
16481 union tcp_log_stackspecific log;
16483 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
16484 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
16485 if (rack->rack_no_prr)
16486 log.u_bbr.flex1 = 0;
16488 log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
16489 log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs;
16490 log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
16491 log.u_bbr.flex4 = max_val;
16492 log.u_bbr.flex5 = 0;
16493 /* Save off the early/late values */
16494 log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
16495 log.u_bbr.applimited = rack->r_ctl.rc_agg_delayed;
16496 log.u_bbr.bw_inuse = rack_get_bw(rack);
16497 log.u_bbr.flex8 = 0;
16498 log.u_bbr.pacing_gain = rack_get_output_gain(rack, NULL);
16499 log.u_bbr.flex7 = 44;
16500 log.u_bbr.pkts_out = tp->t_maxseg;
16501 log.u_bbr.timeStamp = cts;
16502 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
16503 log.u_bbr.lt_epoch = rack->r_ctl.cwnd_to_use;
16504 log.u_bbr.delivered = 0;
16505 lgb = tcp_log_event_(tp, th, NULL, NULL, TCP_LOG_OUT, ERRNO_UNK,
16506 len, &log, false, NULL, NULL, 0, tv);
16510 if (rack->r_is_v6) {
16511 error = ip6_output(m, NULL,
16513 0, NULL, NULL, inp);
16516 #if defined(INET) && defined(INET6)
16521 error = ip_output(m, NULL,
16527 lgb->tlb_errno = error;
16535 rack_log_output(tp, &to, len, tp->snd_max, flags, error, rack_to_usec_ts(tv),
16536 NULL, add_flag, s_mb, s_soff, rack->r_ctl.fsb.hw_tls);
16538 if (tp->snd_una == tp->snd_max) {
16539 rack->r_ctl.rc_tlp_rxt_last_time = cts;
16540 rack_log_progress_event(rack, tp, ticks, PROGRESS_START, __LINE__);
16541 tp->t_acktime = ticks;
16544 tcp_account_for_send(tp, len, 0, 0, rack->r_ctl.fsb.hw_tls);
16546 rack->forced_ack = 0; /* If we send something zap the FA flag */
16548 if ((tp->t_flags & TF_GPUTINPROG) == 0)
16549 rack_start_gp_measurement(tp, rack, tp->snd_max, sb_offset);
16550 tp->snd_max += len;
16551 tp->snd_nxt = tp->snd_max;
16555 idx = (len / segsiz) + 3;
16556 if (idx >= TCP_MSS_ACCT_ATIMER)
16557 counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
16559 counter_u64_add(rack_out_size[idx], 1);
16561 if (len <= rack->r_ctl.fsb.left_to_send)
16562 rack->r_ctl.fsb.left_to_send -= len;
16564 rack->r_ctl.fsb.left_to_send = 0;
16565 if (rack->r_ctl.fsb.left_to_send < segsiz) {
16566 rack->r_fast_output = 0;
16567 rack->r_ctl.fsb.left_to_send = 0;
16568 /* At the end of fast_output scale up the sb */
16569 SOCKBUF_LOCK(&rack->rc_inp->inp_socket->so_snd);
16570 rack_sndbuf_autoscale(rack);
16571 SOCKBUF_UNLOCK(&rack->rc_inp->inp_socket->so_snd);
16573 if (tp->t_rtttime == 0) {
16574 tp->t_rtttime = ticks;
16575 tp->t_rtseq = startseq;
16576 KMOD_TCPSTAT_INC(tcps_segstimed);
16578 if ((rack->r_ctl.fsb.left_to_send >= segsiz) &&
16583 th = rack->r_ctl.fsb.th;
16584 #ifdef TCP_ACCOUNTING
16589 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
16590 counter_u64_add(rack_fto_send, 1);
16591 slot = rack_get_pacing_delay(rack, tp, tot_len, NULL, segsiz);
16592 rack_start_hpts_timer(rack, tp, cts, slot, tot_len, 0);
16593 #ifdef TCP_ACCOUNTING
16594 crtsc = get_cyclecount();
16595 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16596 tp->tcp_cnt_counters[SND_OUT_DATA] += cnt_thru;
16598 counter_u64_add(tcp_cnt_counters[SND_OUT_DATA], cnt_thru);
16599 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16600 tp->tcp_proc_time[SND_OUT_DATA] += (crtsc - ts_val);
16602 counter_u64_add(tcp_proc_time[SND_OUT_DATA], (crtsc - ts_val));
16603 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16604 tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((tot_len + segsiz - 1) / segsiz);
16606 counter_u64_add(tcp_cnt_counters[CNT_OF_MSS_OUT], ((tot_len + segsiz - 1) / segsiz));
16613 rack->r_fast_output = 0;
16617 static struct rack_sendmap *
16618 rack_check_collapsed(struct tcp_rack *rack, uint32_t cts)
16620 struct rack_sendmap *rsm = NULL;
16621 struct rack_sendmap fe;
16625 fe.r_start = rack->r_ctl.last_collapse_point;
16626 rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe);
16627 if ((rsm == NULL) || ((rsm->r_flags & RACK_RWND_COLLAPSED) == 0)) {
16628 /* Nothing, strange turn off validity */
16629 rack->r_collapse_point_valid = 0;
16632 /* Can we send it yet? */
16633 if (rsm->r_end > (rack->rc_tp->snd_una + rack->rc_tp->snd_wnd)) {
16635 * Receiver window has not grown enough for
16636 * the segment to be put on the wire.
16640 if (rsm->r_flags & RACK_ACKED) {
16642 * It has been sacked, lets move to the
16643 * next one if possible.
16645 rack->r_ctl.last_collapse_point = rsm->r_end;
16647 if (SEQ_GEQ(rack->r_ctl.last_collapse_point,
16648 rack->r_ctl.high_collapse_point)) {
16649 rack->r_collapse_point_valid = 0;
16654 /* Now has it been long enough ? */
16655 thresh = rack_calc_thresh_rack(rack, rack_grab_rtt(rack->rc_tp, rack), cts);
16656 if ((cts - ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)])) > thresh) {
16657 rack_log_collapse(rack, rsm->r_start,
16658 (cts - ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)])),
16659 thresh, __LINE__, 6, rsm->r_flags, rsm);
16662 /* Not enough time */
16663 rack_log_collapse(rack, rsm->r_start,
16664 (cts - ((uint32_t)rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)])),
16665 thresh, __LINE__, 7, rsm->r_flags, rsm);
16670 rack_output(struct tcpcb *tp)
16674 uint32_t sb_offset, s_moff = 0;
16675 int32_t len, error = 0;
16677 struct mbuf *m, *s_mb = NULL;
16679 uint32_t if_hw_tsomaxsegcount = 0;
16680 uint32_t if_hw_tsomaxsegsize;
16681 int32_t segsiz, minseg;
16682 long tot_len_this_send = 0;
16684 struct ip *ip = NULL;
16686 struct udphdr *udp = NULL;
16687 struct tcp_rack *rack;
16691 uint8_t wanted_cookie = 0;
16692 u_char opt[TCP_MAXOLEN];
16693 unsigned ipoptlen, optlen, hdrlen, ulen=0;
16696 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
16697 unsigned ipsec_optlen = 0;
16700 int32_t idle, sendalot;
16701 int32_t sub_from_prr = 0;
16702 volatile int32_t sack_rxmit;
16703 struct rack_sendmap *rsm = NULL;
16707 int32_t sup_rack = 0;
16708 uint32_t cts, ms_cts, delayed, early;
16709 uint16_t add_flag = RACK_SENT_SP;
16710 /* The doing_tlp flag will be set by the actual rack_timeout_tlp() */
16711 uint8_t hpts_calling, doing_tlp = 0;
16712 uint32_t cwnd_to_use, pace_max_seg;
16713 int32_t do_a_prefetch = 0;
16714 int32_t prefetch_rsm = 0;
16715 int32_t orig_len = 0;
16717 int32_t prefetch_so_done = 0;
16718 struct tcp_log_buffer *lgb;
16719 struct inpcb *inp = tptoinpcb(tp);
16720 struct sockbuf *sb;
16721 uint64_t ts_val = 0;
16722 #ifdef TCP_ACCOUNTING
16726 struct ip6_hdr *ip6 = NULL;
16729 bool hw_tls = false;
16731 NET_EPOCH_ASSERT();
16732 INP_WLOCK_ASSERT(inp);
16734 /* setup and take the cache hits here */
16735 rack = (struct tcp_rack *)tp->t_fb_ptr;
16736 #ifdef TCP_ACCOUNTING
16738 ts_val = get_cyclecount();
16740 hpts_calling = inp->inp_hpts_calls;
16742 if (tp->t_flags & TF_TOE) {
16743 #ifdef TCP_ACCOUNTING
16746 return (tcp_offload_output(tp));
16750 * For TFO connections in SYN_RECEIVED, only allow the initial
16751 * SYN|ACK and those sent by the retransmit timer.
16753 if (IS_FASTOPEN(tp->t_flags) &&
16754 (tp->t_state == TCPS_SYN_RECEIVED) &&
16755 SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN|ACK sent */
16756 (rack->r_ctl.rc_resend == NULL)) { /* not a retransmit */
16757 #ifdef TCP_ACCOUNTING
16763 if (rack->r_state) {
16764 /* Use the cache line loaded if possible */
16765 isipv6 = rack->r_is_v6;
16767 isipv6 = (rack->rc_inp->inp_vflag & INP_IPV6) != 0;
16771 cts = tcp_get_usecs(&tv);
16772 ms_cts = tcp_tv_to_mssectick(&tv);
16773 if (((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) &&
16774 tcp_in_hpts(rack->rc_inp)) {
16776 * We are on the hpts for some timer but not hptsi output.
16777 * Remove from the hpts unconditionally.
16779 rack_timer_cancel(tp, rack, cts, __LINE__);
16781 /* Are we pacing and late? */
16782 if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
16783 TSTMP_GEQ(cts, rack->r_ctl.rc_last_output_to)) {
16784 /* We are delayed */
16785 delayed = cts - rack->r_ctl.rc_last_output_to;
16789 /* Do the timers, which may override the pacer */
16790 if (rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) {
16793 retval = rack_process_timers(tp, rack, cts, hpts_calling,
16796 counter_u64_add(rack_out_size[TCP_MSS_ACCT_ATIMER], 1);
16797 #ifdef TCP_ACCOUNTING
16801 * If timers want tcp_drop(), then pass error out,
16802 * otherwise suppress it.
16804 return (retval < 0 ? retval : 0);
16807 if (rack->rc_in_persist) {
16808 if (tcp_in_hpts(rack->rc_inp) == 0) {
16809 /* Timer is not running */
16810 rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
16812 #ifdef TCP_ACCOUNTING
16817 if ((rack->rc_ack_required == 1) &&
16818 (rack->r_timer_override == 0)){
16819 /* A timeout occurred and no ack has arrived */
16820 if (tcp_in_hpts(rack->rc_inp) == 0) {
16821 /* Timer is not running */
16822 rack_start_hpts_timer(rack, tp, cts, 0, 0, 0);
16824 #ifdef TCP_ACCOUNTING
16829 if ((rack->r_timer_override) ||
16830 (rack->rc_ack_can_sendout_data) ||
16832 (tp->t_state < TCPS_ESTABLISHED)) {
16833 rack->rc_ack_can_sendout_data = 0;
16834 if (tcp_in_hpts(rack->rc_inp))
16835 tcp_hpts_remove(rack->rc_inp);
16836 } else if (tcp_in_hpts(rack->rc_inp)) {
16838 * On the hpts you can't pass even if ACKNOW is on, we will
16839 * when the hpts fires.
16841 #ifdef TCP_ACCOUNTING
16842 crtsc = get_cyclecount();
16843 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16844 tp->tcp_proc_time[SND_BLOCKED] += (crtsc - ts_val);
16846 counter_u64_add(tcp_proc_time[SND_BLOCKED], (crtsc - ts_val));
16847 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
16848 tp->tcp_cnt_counters[SND_BLOCKED]++;
16850 counter_u64_add(tcp_cnt_counters[SND_BLOCKED], 1);
16853 counter_u64_add(rack_out_size[TCP_MSS_ACCT_INPACE], 1);
16856 rack->rc_inp->inp_hpts_calls = 0;
16857 /* Finish out both pacing early and late accounting */
16858 if ((rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
16859 TSTMP_GT(rack->r_ctl.rc_last_output_to, cts)) {
16860 early = rack->r_ctl.rc_last_output_to - cts;
16864 rack->r_ctl.rc_agg_delayed += delayed;
16866 } else if (early) {
16867 rack->r_ctl.rc_agg_early += early;
16870 /* Now that early/late accounting is done turn off the flag */
16871 rack->r_ctl.rc_hpts_flags &= ~PACE_PKT_OUTPUT;
16872 rack->r_wanted_output = 0;
16873 rack->r_timer_override = 0;
16874 if ((tp->t_state != rack->r_state) &&
16875 TCPS_HAVEESTABLISHED(tp->t_state)) {
16876 rack_set_state(tp, rack);
16878 if ((rack->r_fast_output) &&
16879 (doing_tlp == 0) &&
16880 (tp->rcv_numsacks == 0)) {
16884 ret = rack_fast_output(tp, rack, ts_val, cts, ms_cts, &tv, tot_len_this_send, &error);
16888 inp = rack->rc_inp;
16889 so = inp->inp_socket;
16894 inp = rack->rc_inp;
16896 * For TFO connections in SYN_SENT or SYN_RECEIVED,
16897 * only allow the initial SYN or SYN|ACK and those sent
16898 * by the retransmit timer.
16900 if (IS_FASTOPEN(tp->t_flags) &&
16901 ((tp->t_state == TCPS_SYN_RECEIVED) ||
16902 (tp->t_state == TCPS_SYN_SENT)) &&
16903 SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN or SYN|ACK sent */
16904 (tp->t_rxtshift == 0)) { /* not a retransmit */
16905 cwnd_to_use = rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
16906 so = inp->inp_socket;
16908 goto just_return_nolock;
16911 * Determine length of data that should be transmitted, and flags
16912 * that will be used. If there is some data or critical controls
16913 * (SYN, RST) to send, then transmit; otherwise, investigate
16916 idle = (tp->t_flags & TF_LASTIDLE) || (tp->snd_max == tp->snd_una);
16917 if (tp->t_idle_reduce) {
16918 if (idle && (TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur))
16919 rack_cc_after_idle(rack, tp);
16921 tp->t_flags &= ~TF_LASTIDLE;
16923 if (tp->t_flags & TF_MORETOCOME) {
16924 tp->t_flags |= TF_LASTIDLE;
16928 if ((tp->snd_una == tp->snd_max) &&
16929 rack->r_ctl.rc_went_idle_time &&
16930 TSTMP_GT(cts, rack->r_ctl.rc_went_idle_time)) {
16931 idle = cts - rack->r_ctl.rc_went_idle_time;
16932 if (idle > rack_min_probertt_hold) {
16933 /* Count as a probe rtt */
16934 if (rack->in_probe_rtt == 0) {
16935 rack->r_ctl.rc_lower_rtt_us_cts = cts;
16936 rack->r_ctl.rc_time_probertt_entered = rack->r_ctl.rc_lower_rtt_us_cts;
16937 rack->r_ctl.rc_time_probertt_starts = rack->r_ctl.rc_lower_rtt_us_cts;
16938 rack->r_ctl.rc_time_of_last_probertt = rack->r_ctl.rc_lower_rtt_us_cts;
16940 rack_exit_probertt(rack, cts);
16945 if (rack_use_fsb && (rack->r_fsb_inited == 0) && (rack->r_state != TCPS_CLOSED))
16946 rack_init_fsb_block(tp, rack);
16949 * If we've recently taken a timeout, snd_max will be greater than
16950 * snd_nxt. There may be SACK information that allows us to avoid
16951 * resending already delivered data. Adjust snd_nxt accordingly.
16954 cts = tcp_get_usecs(&tv);
16955 ms_cts = tcp_tv_to_mssectick(&tv);
16958 segsiz = min(ctf_fixed_maxseg(tp), rack->r_ctl.rc_pace_min_segs);
16960 if (rack->r_ctl.rc_pace_max_segs == 0)
16961 pace_max_seg = rack->rc_user_set_max_segs * segsiz;
16963 pace_max_seg = rack->r_ctl.rc_pace_max_segs;
16964 sb_offset = tp->snd_max - tp->snd_una;
16965 cwnd_to_use = rack->r_ctl.cwnd_to_use = tp->snd_cwnd;
16966 flags = tcp_outflags[tp->t_state];
16967 while (rack->rc_free_cnt < rack_free_cache) {
16968 rsm = rack_alloc(rack);
16970 if (inp->inp_hpts_calls)
16971 /* Retry in a ms */
16972 slot = (1 * HPTS_USEC_IN_MSEC);
16973 so = inp->inp_socket;
16975 goto just_return_nolock;
16977 TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_tnext);
16978 rack->rc_free_cnt++;
16981 if (inp->inp_hpts_calls)
16982 inp->inp_hpts_calls = 0;
16986 if (flags & TH_RST) {
16987 SOCKBUF_LOCK(&inp->inp_socket->so_snd);
16988 so = inp->inp_socket;
16992 if (rack->r_ctl.rc_resend) {
16993 /* Retransmit timer */
16994 rsm = rack->r_ctl.rc_resend;
16995 rack->r_ctl.rc_resend = NULL;
16996 len = rsm->r_end - rsm->r_start;
16999 KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
17000 ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
17001 __func__, __LINE__,
17002 rsm->r_start, tp->snd_una, tp, rack, rsm));
17003 sb_offset = rsm->r_start - tp->snd_una;
17006 } else if (rack->r_collapse_point_valid &&
17007 ((rsm = rack_check_collapsed(rack, cts)) != NULL)) {
17009 * If an RSM is returned then enough time has passed
17010 * for us to retransmit it. Move up the collapse point,
17011 * since this rsm has its chance to retransmit now.
17013 rack_trace_point(rack, RACK_TP_COLLAPSED_RXT);
17014 rack->r_ctl.last_collapse_point = rsm->r_end;
17016 if (SEQ_GEQ(rack->r_ctl.last_collapse_point,
17017 rack->r_ctl.high_collapse_point))
17018 rack->r_collapse_point_valid = 0;
17020 /* We are not doing a TLP */
17022 len = rsm->r_end - rsm->r_start;
17023 sb_offset = rsm->r_start - tp->snd_una;
17025 if ((rack->full_size_rxt == 0) &&
17026 (rack->shape_rxt_to_pacing_min == 0) &&
17029 } else if ((rsm = tcp_rack_output(tp, rack, cts)) != NULL) {
17030 /* We have a retransmit that takes precedence */
17031 if ((!IN_FASTRECOVERY(tp->t_flags)) &&
17032 ((rsm->r_flags & RACK_MUST_RXT) == 0) &&
17033 ((tp->t_flags & TF_WASFRECOVERY) == 0)) {
17034 /* Enter recovery if not induced by a time-out */
17035 rack_cong_signal(tp, CC_NDUPACK, tp->snd_una, __LINE__);
17038 if (SEQ_LT(rsm->r_start, tp->snd_una)) {
17039 panic("Huh, tp:%p rack:%p rsm:%p start:%u < snd_una:%u\n",
17040 tp, rack, rsm, rsm->r_start, tp->snd_una);
17043 len = rsm->r_end - rsm->r_start;
17044 KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
17045 ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
17046 __func__, __LINE__,
17047 rsm->r_start, tp->snd_una, tp, rack, rsm));
17048 sb_offset = rsm->r_start - tp->snd_una;
17054 KMOD_TCPSTAT_INC(tcps_sack_rexmits);
17055 KMOD_TCPSTAT_ADD(tcps_sack_rexmit_bytes,
17058 } else if (rack->r_ctl.rc_tlpsend) {
17059 /* Tail loss probe */
17064 * Check if we can do a TLP with a RACK'd packet
17065 * this can happen if we are not doing the rack
17066 * cheat and we skipped to a TLP and it
17069 rsm = rack->r_ctl.rc_tlpsend;
17070 /* We are doing a TLP make sure the flag is preent */
17071 rsm->r_flags |= RACK_TLP;
17072 rack->r_ctl.rc_tlpsend = NULL;
17074 tlen = rsm->r_end - rsm->r_start;
17077 KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start),
17078 ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p",
17079 __func__, __LINE__,
17080 rsm->r_start, tp->snd_una, tp, rack, rsm));
17081 sb_offset = rsm->r_start - tp->snd_una;
17082 cwin = min(tp->snd_wnd, tlen);
17085 if (rack->r_must_retran &&
17086 (doing_tlp == 0) &&
17087 (SEQ_GT(tp->snd_max, tp->snd_una)) &&
17090 * There are two different ways that we
17091 * can get into this block:
17092 * a) This is a non-sack connection, we had a time-out
17093 * and thus r_must_retran was set and everything
17094 * left outstanding as been marked for retransmit.
17095 * b) The MTU of the path shrank, so that everything
17096 * was marked to be retransmitted with the smaller
17097 * mtu and r_must_retran was set.
17099 * This means that we expect the sendmap (outstanding)
17100 * to all be marked must. We can use the tmap to
17104 int sendwin, flight;
17106 sendwin = min(tp->snd_wnd, tp->snd_cwnd);
17107 flight = ctf_flight_size(tp, rack->r_ctl.rc_out_at_rto);
17108 if (flight >= sendwin) {
17110 * We can't send yet.
17112 so = inp->inp_socket;
17114 goto just_return_nolock;
17117 * This is the case a/b mentioned above. All
17118 * outstanding/not-acked should be marked.
17119 * We can use the tmap to find them.
17121 rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap);
17124 rack->r_must_retran = 0;
17125 rack->r_ctl.rc_out_at_rto = 0;
17126 so = inp->inp_socket;
17128 goto just_return_nolock;
17130 if ((rsm->r_flags & RACK_MUST_RXT) == 0) {
17132 * The first one does not have the flag, did we collapse
17133 * further up in our list?
17135 rack->r_must_retran = 0;
17136 rack->r_ctl.rc_out_at_rto = 0;
17141 len = rsm->r_end - rsm->r_start;
17142 sb_offset = rsm->r_start - tp->snd_una;
17144 if ((rack->full_size_rxt == 0) &&
17145 (rack->shape_rxt_to_pacing_min == 0) &&
17149 * Delay removing the flag RACK_MUST_RXT so
17150 * that the fastpath for retransmit will
17151 * work with this rsm.
17156 * Enforce a connection sendmap count limit if set
17157 * as long as we are not retransmiting.
17159 if ((rsm == NULL) &&
17160 (rack->do_detection == 0) &&
17161 (V_tcp_map_entries_limit > 0) &&
17162 (rack->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) {
17163 counter_u64_add(rack_to_alloc_limited, 1);
17164 if (!rack->alloc_limit_reported) {
17165 rack->alloc_limit_reported = 1;
17166 counter_u64_add(rack_alloc_limited_conns, 1);
17168 so = inp->inp_socket;
17170 goto just_return_nolock;
17172 if (rsm && (rsm->r_flags & RACK_HAS_FIN)) {
17173 /* we are retransmitting the fin */
17177 * When retransmitting data do *not* include the
17178 * FIN. This could happen from a TLP probe.
17183 if (rsm && rack->r_fsb_inited && rack_use_rsm_rfo &&
17184 ((rsm->r_flags & RACK_HAS_FIN) == 0)) {
17187 ret = rack_fast_rsm_output(tp, rack, rsm, ts_val, cts, ms_cts, &tv, len, doing_tlp);
17191 so = inp->inp_socket;
17193 if (do_a_prefetch == 0) {
17194 kern_prefetch(sb, &do_a_prefetch);
17197 #ifdef NETFLIX_SHARED_CWND
17198 if ((tp->t_flags2 & TF2_TCP_SCWND_ALLOWED) &&
17199 rack->rack_enable_scwnd) {
17200 /* We are doing cwnd sharing */
17201 if (rack->gp_ready &&
17202 (rack->rack_attempted_scwnd == 0) &&
17203 (rack->r_ctl.rc_scw == NULL) &&
17205 /* The pcbid is in, lets make an attempt */
17206 counter_u64_add(rack_try_scwnd, 1);
17207 rack->rack_attempted_scwnd = 1;
17208 rack->r_ctl.rc_scw = tcp_shared_cwnd_alloc(tp,
17209 &rack->r_ctl.rc_scw_index,
17212 if (rack->r_ctl.rc_scw &&
17213 (rack->rack_scwnd_is_idle == 1) &&
17214 sbavail(&so->so_snd)) {
17215 /* we are no longer out of data */
17216 tcp_shared_cwnd_active(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
17217 rack->rack_scwnd_is_idle = 0;
17219 if (rack->r_ctl.rc_scw) {
17220 /* First lets update and get the cwnd */
17221 rack->r_ctl.cwnd_to_use = cwnd_to_use = tcp_shared_cwnd_update(rack->r_ctl.rc_scw,
17222 rack->r_ctl.rc_scw_index,
17223 tp->snd_cwnd, tp->snd_wnd, segsiz);
17228 * Get standard flags, and add SYN or FIN if requested by 'hidden'
17231 if (tp->t_flags & TF_NEEDFIN)
17233 if (tp->t_flags & TF_NEEDSYN)
17235 if ((sack_rxmit == 0) && (prefetch_rsm == 0)) {
17237 end_rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_tmap, rack_sendmap, r_tnext);
17239 kern_prefetch(end_rsm, &prefetch_rsm);
17244 * If snd_nxt == snd_max and we have transmitted a FIN, the
17245 * sb_offset will be > 0 even if so_snd.sb_cc is 0, resulting in a
17246 * negative length. This can also occur when TCP opens up its
17247 * congestion window while receiving additional duplicate acks after
17248 * fast-retransmit because TCP will reset snd_nxt to snd_max after
17249 * the fast-retransmit.
17251 * In the normal retransmit-FIN-only case, however, snd_nxt will be
17252 * set to snd_una, the sb_offset will be 0, and the length may wind
17255 * If sack_rxmit is true we are retransmitting from the scoreboard
17256 * in which case len is already set.
17258 if ((sack_rxmit == 0) &&
17259 (TCPS_HAVEESTABLISHED(tp->t_state) || IS_FASTOPEN(tp->t_flags))) {
17262 avail = sbavail(sb);
17263 if (SEQ_GT(tp->snd_nxt, tp->snd_una) && avail)
17264 sb_offset = tp->snd_nxt - tp->snd_una;
17267 if ((IN_FASTRECOVERY(tp->t_flags) == 0) || rack->rack_no_prr) {
17268 if (rack->r_ctl.rc_tlp_new_data) {
17269 /* TLP is forcing out new data */
17270 if (rack->r_ctl.rc_tlp_new_data > (uint32_t) (avail - sb_offset)) {
17271 rack->r_ctl.rc_tlp_new_data = (uint32_t) (avail - sb_offset);
17273 if ((rack->r_ctl.rc_tlp_new_data + sb_offset) > tp->snd_wnd) {
17274 if (tp->snd_wnd > sb_offset)
17275 len = tp->snd_wnd - sb_offset;
17279 len = rack->r_ctl.rc_tlp_new_data;
17281 rack->r_ctl.rc_tlp_new_data = 0;
17283 len = rack_what_can_we_send(tp, rack, cwnd_to_use, avail, sb_offset);
17285 if ((rack->r_ctl.crte == NULL) && IN_FASTRECOVERY(tp->t_flags) && (len > segsiz)) {
17287 * For prr=off, we need to send only 1 MSS
17288 * at a time. We do this because another sack could
17289 * be arriving that causes us to send retransmits and
17290 * we don't want to be on a long pace due to a larger send
17291 * that keeps us from sending out the retransmit.
17296 uint32_t outstanding;
17298 * We are inside of a Fast recovery episode, this
17299 * is caused by a SACK or 3 dup acks. At this point
17300 * we have sent all the retransmissions and we rely
17301 * on PRR to dictate what we will send in the form of
17305 outstanding = tp->snd_max - tp->snd_una;
17306 if ((rack->r_ctl.rc_prr_sndcnt + outstanding) > tp->snd_wnd) {
17307 if (tp->snd_wnd > outstanding) {
17308 len = tp->snd_wnd - outstanding;
17309 /* Check to see if we have the data */
17310 if ((sb_offset + len) > avail) {
17311 /* It does not all fit */
17312 if (avail > sb_offset)
17313 len = avail - sb_offset;
17320 } else if (avail > sb_offset) {
17321 len = avail - sb_offset;
17326 if (len > rack->r_ctl.rc_prr_sndcnt) {
17327 len = rack->r_ctl.rc_prr_sndcnt;
17333 if (len > segsiz) {
17335 * We should never send more than a MSS when
17336 * retransmitting or sending new data in prr
17337 * mode unless the override flag is on. Most
17338 * likely the PRR algorithm is not going to
17339 * let us send a lot as well :-)
17341 if (rack->r_ctl.rc_prr_sendalot == 0) {
17344 } else if (len < segsiz) {
17346 * Do we send any? The idea here is if the
17347 * send empty's the socket buffer we want to
17348 * do it. However if not then lets just wait
17349 * for our prr_sndcnt to get bigger.
17353 leftinsb = sbavail(sb) - sb_offset;
17354 if (leftinsb > len) {
17355 /* This send does not empty the sb */
17360 } else if (!TCPS_HAVEESTABLISHED(tp->t_state)) {
17362 * If you have not established
17363 * and are not doing FAST OPEN
17366 if ((sack_rxmit == 0) &&
17367 (!IS_FASTOPEN(tp->t_flags))){
17372 if (prefetch_so_done == 0) {
17373 kern_prefetch(so, &prefetch_so_done);
17374 prefetch_so_done = 1;
17377 * Lop off SYN bit if it has already been sent. However, if this is
17378 * SYN-SENT state and if segment contains data and if we don't know
17379 * that foreign host supports TAO, suppress sending segment.
17381 if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una) &&
17382 ((sack_rxmit == 0) && (tp->t_rxtshift == 0))) {
17384 * When sending additional segments following a TFO SYN|ACK,
17385 * do not include the SYN bit.
17387 if (IS_FASTOPEN(tp->t_flags) &&
17388 (tp->t_state == TCPS_SYN_RECEIVED))
17392 * Be careful not to send data and/or FIN on SYN segments. This
17393 * measure is needed to prevent interoperability problems with not
17394 * fully conformant TCP implementations.
17396 if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) {
17401 * On TFO sockets, ensure no data is sent in the following cases:
17403 * - When retransmitting SYN|ACK on a passively-created socket
17405 * - When retransmitting SYN on an actively created socket
17407 * - When sending a zero-length cookie (cookie request) on an
17408 * actively created socket
17410 * - When the socket is in the CLOSED state (RST is being sent)
17412 if (IS_FASTOPEN(tp->t_flags) &&
17413 (((flags & TH_SYN) && (tp->t_rxtshift > 0)) ||
17414 ((tp->t_state == TCPS_SYN_SENT) &&
17415 (tp->t_tfo_client_cookie_len == 0)) ||
17416 (flags & TH_RST))) {
17420 /* Without fast-open there should never be data sent on a SYN */
17421 if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags))) {
17422 tp->snd_nxt = tp->iss;
17425 if ((len > segsiz) && (tcp_dsack_block_exists(tp))) {
17426 /* We only send 1 MSS if we have a DSACK block */
17427 add_flag |= RACK_SENT_W_DSACK;
17433 * If FIN has been sent but not acked, but we haven't been
17434 * called to retransmit, len will be < 0. Otherwise, window
17435 * shrank after we sent into it. If window shrank to 0,
17436 * cancel pending retransmit, pull snd_nxt back to (closed)
17437 * window, and set the persist timer if it isn't already
17438 * going. If the window didn't close completely, just wait
17441 * We also do a general check here to ensure that we will
17442 * set the persist timer when we have data to send, but a
17443 * 0-byte window. This makes sure the persist timer is set
17444 * even if the packet hits one of the "goto send" lines
17448 if ((tp->snd_wnd == 0) &&
17449 (TCPS_HAVEESTABLISHED(tp->t_state)) &&
17450 (tp->snd_una == tp->snd_max) &&
17451 (sb_offset < (int)sbavail(sb))) {
17452 rack_enter_persist(tp, rack, cts);
17454 } else if ((rsm == NULL) &&
17455 (doing_tlp == 0) &&
17456 (len < pace_max_seg)) {
17458 * We are not sending a maximum sized segment for
17459 * some reason. Should we not send anything (think
17460 * sws or persists)?
17462 if ((tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), minseg)) &&
17463 (TCPS_HAVEESTABLISHED(tp->t_state)) &&
17465 (len < (int)(sbavail(sb) - sb_offset))) {
17467 * Here the rwnd is less than
17468 * the minimum pacing size, this is not a retransmit,
17469 * we are established and
17470 * the send is not the last in the socket buffer
17471 * we send nothing, and we may enter persists
17472 * if nothing is outstanding.
17475 if (tp->snd_max == tp->snd_una) {
17477 * Nothing out we can
17478 * go into persists.
17480 rack_enter_persist(tp, rack, cts);
17482 } else if ((cwnd_to_use >= max(minseg, (segsiz * 4))) &&
17483 (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * segsiz)) &&
17484 (len < (int)(sbavail(sb) - sb_offset)) &&
17487 * Here we are not retransmitting, and
17488 * the cwnd is not so small that we could
17489 * not send at least a min size (rxt timer
17490 * not having gone off), We have 2 segments or
17491 * more already in flight, its not the tail end
17492 * of the socket buffer and the cwnd is blocking
17493 * us from sending out a minimum pacing segment size.
17494 * Lets not send anything.
17497 } else if (((tp->snd_wnd - ctf_outstanding(tp)) <
17498 min((rack->r_ctl.rc_high_rwnd/2), minseg)) &&
17499 (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * segsiz)) &&
17500 (len < (int)(sbavail(sb) - sb_offset)) &&
17501 (TCPS_HAVEESTABLISHED(tp->t_state))) {
17503 * Here we have a send window but we have
17504 * filled it up and we can't send another pacing segment.
17505 * We also have in flight more than 2 segments
17506 * and we are not completing the sb i.e. we allow
17507 * the last bytes of the sb to go out even if
17508 * its not a full pacing segment.
17511 } else if ((rack->r_ctl.crte != NULL) &&
17512 (tp->snd_wnd >= (pace_max_seg * max(1, rack_hw_rwnd_factor))) &&
17513 (cwnd_to_use >= (pace_max_seg + (4 * segsiz))) &&
17514 (ctf_flight_size(tp, rack->r_ctl.rc_sacked) >= (2 * segsiz)) &&
17515 (len < (int)(sbavail(sb) - sb_offset))) {
17517 * Here we are doing hardware pacing, this is not a TLP,
17518 * we are not sending a pace max segment size, there is rwnd
17519 * room to send at least N pace_max_seg, the cwnd is greater
17520 * than or equal to a full pacing segments plus 4 mss and we have 2 or
17521 * more segments in flight and its not the tail of the socket buffer.
17523 * We don't want to send instead we need to get more ack's in to
17524 * allow us to send a full pacing segment. Normally, if we are pacing
17525 * about the right speed, we should have finished our pacing
17526 * send as most of the acks have come back if we are at the
17527 * right rate. This is a bit fuzzy since return path delay
17528 * can delay the acks, which is why we want to make sure we
17529 * have cwnd space to have a bit more than a max pace segments in flight.
17531 * If we have not gotten our acks back we are pacing at too high a
17532 * rate delaying will not hurt and will bring our GP estimate down by
17533 * injecting the delay. If we don't do this we will send
17534 * 2 MSS out in response to the acks being clocked in which
17535 * defeats the point of hw-pacing (i.e. to help us get
17536 * larger TSO's out).
17543 /* len will be >= 0 after this point. */
17544 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
17545 rack_sndbuf_autoscale(rack);
17547 * Decide if we can use TCP Segmentation Offloading (if supported by
17550 * TSO may only be used if we are in a pure bulk sending state. The
17551 * presence of TCP-MD5, SACK retransmits, SACK advertizements and IP
17552 * options prevent using TSO. With TSO the TCP header is the same
17553 * (except for the sequence number) for all generated packets. This
17554 * makes it impossible to transmit any options which vary per
17555 * generated segment or packet.
17557 * IPv4 handling has a clear separation of ip options and ip header
17558 * flags while IPv6 combines both in in6p_outputopts. ip6_optlen() does
17559 * the right thing below to provide length of just ip options and thus
17560 * checking for ipoptlen is enough to decide if ip options are present.
17563 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
17565 * Pre-calculate here as we save another lookup into the darknesses
17566 * of IPsec that way and can actually decide if TSO is ok.
17569 if (isipv6 && IPSEC_ENABLED(ipv6))
17570 ipsec_optlen = IPSEC_HDRSIZE(ipv6, inp);
17576 if (IPSEC_ENABLED(ipv4))
17577 ipsec_optlen = IPSEC_HDRSIZE(ipv4, inp);
17581 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
17582 ipoptlen += ipsec_optlen;
17584 if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > segsiz &&
17585 (tp->t_port == 0) &&
17586 ((tp->t_flags & TF_SIGNATURE) == 0) &&
17587 tp->rcv_numsacks == 0 && sack_rxmit == 0 &&
17591 uint32_t outstanding __unused;
17593 outstanding = tp->snd_max - tp->snd_una;
17594 if (tp->t_flags & TF_SENTFIN) {
17596 * If we sent a fin, snd_max is 1 higher than
17602 if ((rsm->r_flags & RACK_HAS_FIN) == 0)
17605 if (SEQ_LT(tp->snd_nxt + len, tp->snd_una +
17610 recwin = lmin(lmax(sbspace(&so->so_rcv), 0),
17611 (long)TCP_MAXWIN << tp->rcv_scale);
17614 * Sender silly window avoidance. We transmit under the following
17615 * conditions when len is non-zero:
17617 * - We have a full segment (or more with TSO) - This is the last
17618 * buffer in a write()/send() and we are either idle or running
17619 * NODELAY - we've timed out (e.g. persist timer) - we have more
17620 * then 1/2 the maximum send window's worth of data (receiver may be
17621 * limited the window size) - we need to retransmit
17624 if (len >= segsiz) {
17628 * NOTE! on localhost connections an 'ack' from the remote
17629 * end may occur synchronously with the output and cause us
17630 * to flush a buffer queued with moretocome. XXX
17633 if (!(tp->t_flags & TF_MORETOCOME) && /* normal case */
17634 (idle || (tp->t_flags & TF_NODELAY)) &&
17635 ((uint32_t)len + (uint32_t)sb_offset >= sbavail(sb)) &&
17636 (tp->t_flags & TF_NOPUSH) == 0) {
17640 if ((tp->snd_una == tp->snd_max) && len) { /* Nothing outstanding */
17644 if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
17648 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { /* retransmit case */
17656 if (((tp->snd_wnd - ctf_outstanding(tp)) < segsiz) &&
17657 (ctf_outstanding(tp) < (segsiz * 2))) {
17659 * We have less than two MSS outstanding (delayed ack)
17660 * and our rwnd will not let us send a full sized
17661 * MSS. Lets go ahead and let this small segment
17662 * out because we want to try to have at least two
17663 * packets inflight to not be caught by delayed ack.
17670 * Sending of standalone window updates.
17672 * Window updates are important when we close our window due to a
17673 * full socket buffer and are opening it again after the application
17674 * reads data from it. Once the window has opened again and the
17675 * remote end starts to send again the ACK clock takes over and
17676 * provides the most current window information.
17678 * We must avoid the silly window syndrome whereas every read from
17679 * the receive buffer, no matter how small, causes a window update
17680 * to be sent. We also should avoid sending a flurry of window
17681 * updates when the socket buffer had queued a lot of data and the
17682 * application is doing small reads.
17684 * Prevent a flurry of pointless window updates by only sending an
17685 * update when we can increase the advertized window by more than
17686 * 1/4th of the socket buffer capacity. When the buffer is getting
17687 * full or is very small be more aggressive and send an update
17688 * whenever we can increase by two mss sized segments. In all other
17689 * situations the ACK's to new incoming data will carry further
17690 * window increases.
17692 * Don't send an independent window update if a delayed ACK is
17693 * pending (it will get piggy-backed on it) or the remote side
17694 * already has done a half-close and won't send more data. Skip
17695 * this if the connection is in T/TCP half-open state.
17697 if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) &&
17698 !(tp->t_flags & TF_DELACK) &&
17699 !TCPS_HAVERCVDFIN(tp->t_state)) {
17701 * "adv" is the amount we could increase the window, taking
17702 * into account that we are limited by TCP_MAXWIN <<
17709 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) {
17710 oldwin = (tp->rcv_adv - tp->rcv_nxt);
17714 /* We can't increase the window */
17721 * If the new window size ends up being the same as or less
17722 * than the old size when it is scaled, then don't force
17725 if (oldwin >> tp->rcv_scale >= (adv + oldwin) >> tp->rcv_scale)
17728 if (adv >= (int32_t)(2 * segsiz) &&
17729 (adv >= (int32_t)(so->so_rcv.sb_hiwat / 4) ||
17730 recwin <= (int32_t)(so->so_rcv.sb_hiwat / 8) ||
17731 so->so_rcv.sb_hiwat <= 8 * segsiz)) {
17735 if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat) {
17743 * Send if we owe the peer an ACK, RST, SYN, or urgent data. ACKNOW
17744 * is also a catch-all for the retransmit timer timeout case.
17746 if (tp->t_flags & TF_ACKNOW) {
17750 if (((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0)) {
17755 * If our state indicates that FIN should be sent and we have not
17756 * yet done so, then we need to send.
17758 if ((flags & TH_FIN) &&
17759 (tp->snd_nxt == tp->snd_una)) {
17764 * No reason to send a segment, just return.
17767 SOCKBUF_UNLOCK(sb);
17768 just_return_nolock:
17770 int app_limited = CTF_JR_SENT_DATA;
17772 if (tot_len_this_send > 0) {
17773 /* Make sure snd_nxt is up to max */
17774 rack->r_ctl.fsb.recwin = recwin;
17775 slot = rack_get_pacing_delay(rack, tp, tot_len_this_send, NULL, segsiz);
17776 if ((error == 0) &&
17778 ((flags & (TH_SYN|TH_FIN)) == 0) &&
17780 (tp->snd_nxt == tp->snd_max) &&
17781 (tp->rcv_numsacks == 0) &&
17782 rack->r_fsb_inited &&
17783 TCPS_HAVEESTABLISHED(tp->t_state) &&
17784 (rack->r_must_retran == 0) &&
17785 ((tp->t_flags & TF_NEEDFIN) == 0) &&
17786 (len > 0) && (orig_len > 0) &&
17787 (orig_len > len) &&
17788 ((orig_len - len) >= segsiz) &&
17790 ((optlen == TCPOLEN_TSTAMP_APPA) && (to.to_flags & TOF_TS)))) {
17791 /* We can send at least one more MSS using our fsb */
17793 rack->r_fast_output = 1;
17794 rack->r_ctl.fsb.m = sbsndmbuf(sb, (tp->snd_max - tp->snd_una), &rack->r_ctl.fsb.off);
17795 rack->r_ctl.fsb.o_m_len = rack->r_ctl.fsb.m->m_len;
17796 rack->r_ctl.fsb.tcp_flags = flags;
17797 rack->r_ctl.fsb.left_to_send = orig_len - len;
17799 rack->r_ctl.fsb.hw_tls = 1;
17801 rack->r_ctl.fsb.hw_tls = 0;
17802 KASSERT((rack->r_ctl.fsb.left_to_send <= (sbavail(sb) - (tp->snd_max - tp->snd_una))),
17803 ("rack:%p left_to_send:%u sbavail:%u out:%u",
17804 rack, rack->r_ctl.fsb.left_to_send, sbavail(sb),
17805 (tp->snd_max - tp->snd_una)));
17806 if (rack->r_ctl.fsb.left_to_send < segsiz)
17807 rack->r_fast_output = 0;
17809 if (rack->r_ctl.fsb.left_to_send == (sbavail(sb) - (tp->snd_max - tp->snd_una)))
17810 rack->r_ctl.fsb.rfo_apply_push = 1;
17812 rack->r_ctl.fsb.rfo_apply_push = 0;
17815 rack->r_fast_output = 0;
17818 rack_log_fsb(rack, tp, so, flags,
17819 ipoptlen, orig_len, len, 0,
17820 1, optlen, __LINE__, 1);
17821 if (SEQ_GT(tp->snd_max, tp->snd_nxt))
17822 tp->snd_nxt = tp->snd_max;
17824 int end_window = 0;
17825 uint32_t seq = tp->gput_ack;
17827 rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
17830 * Mark the last sent that we just-returned (hinting
17831 * that delayed ack may play a role in any rtt measurement).
17833 rsm->r_just_ret = 1;
17835 counter_u64_add(rack_out_size[TCP_MSS_ACCT_JUSTRET], 1);
17836 rack->r_ctl.rc_agg_delayed = 0;
17839 rack->r_ctl.rc_agg_early = 0;
17840 if ((ctf_outstanding(tp) +
17841 min(max(segsiz, (rack->r_ctl.rc_high_rwnd/2)),
17842 minseg)) >= tp->snd_wnd) {
17843 /* We are limited by the rwnd */
17844 app_limited = CTF_JR_RWND_LIMITED;
17845 if (IN_FASTRECOVERY(tp->t_flags))
17846 rack->r_ctl.rc_prr_sndcnt = 0;
17847 } else if (ctf_outstanding(tp) >= sbavail(sb)) {
17848 /* We are limited by whats available -- app limited */
17849 app_limited = CTF_JR_APP_LIMITED;
17850 if (IN_FASTRECOVERY(tp->t_flags))
17851 rack->r_ctl.rc_prr_sndcnt = 0;
17852 } else if ((idle == 0) &&
17853 ((tp->t_flags & TF_NODELAY) == 0) &&
17854 ((uint32_t)len + (uint32_t)sb_offset >= sbavail(sb)) &&
17857 * No delay is not on and the
17858 * user is sending less than 1MSS. This
17859 * brings out SWS avoidance so we
17860 * don't send. Another app-limited case.
17862 app_limited = CTF_JR_APP_LIMITED;
17863 } else if (tp->t_flags & TF_NOPUSH) {
17865 * The user has requested no push of
17866 * the last segment and we are
17867 * at the last segment. Another app
17870 app_limited = CTF_JR_APP_LIMITED;
17871 } else if ((ctf_outstanding(tp) + minseg) > cwnd_to_use) {
17873 app_limited = CTF_JR_CWND_LIMITED;
17874 } else if (IN_FASTRECOVERY(tp->t_flags) &&
17875 (rack->rack_no_prr == 0) &&
17876 (rack->r_ctl.rc_prr_sndcnt < segsiz)) {
17877 app_limited = CTF_JR_PRR;
17879 /* Now why here are we not sending? */
17882 panic("rack:%p hit JR_ASSESSING case cwnd_to_use:%u?", rack, cwnd_to_use);
17885 app_limited = CTF_JR_ASSESSING;
17888 * App limited in some fashion, for our pacing GP
17889 * measurements we don't want any gap (even cwnd).
17890 * Close down the measurement window.
17892 if (rack_cwnd_block_ends_measure &&
17893 ((app_limited == CTF_JR_CWND_LIMITED) ||
17894 (app_limited == CTF_JR_PRR))) {
17896 * The reason we are not sending is
17897 * the cwnd (or prr). We have been configured
17898 * to end the measurement window in
17902 } else if (rack_rwnd_block_ends_measure &&
17903 (app_limited == CTF_JR_RWND_LIMITED)) {
17905 * We are rwnd limited and have been
17906 * configured to end the measurement
17907 * window in this case.
17910 } else if (app_limited == CTF_JR_APP_LIMITED) {
17912 * A true application limited period, we have
17916 } else if (app_limited == CTF_JR_ASSESSING) {
17918 * In the assessing case we hit the end of
17919 * the if/else and had no known reason
17920 * This will panic us under invariants..
17922 * If we get this out in logs we need to
17923 * investagate which reason we missed.
17930 /* Adjust the Gput measurement */
17931 if ((tp->t_flags & TF_GPUTINPROG) &&
17932 SEQ_GT(tp->gput_ack, tp->snd_max)) {
17933 tp->gput_ack = tp->snd_max;
17934 if ((tp->gput_ack - tp->gput_seq) < (MIN_GP_WIN * segsiz)) {
17936 * There is not enough to measure.
17938 tp->t_flags &= ~TF_GPUTINPROG;
17939 rack_log_pacing_delay_calc(rack, (tp->gput_ack - tp->gput_seq) /*flex2*/,
17940 rack->r_ctl.rc_gp_srtt /*flex1*/,
17942 0, 0, 18, __LINE__, NULL, 0);
17946 /* Mark the last packet has app limited */
17947 rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree);
17948 if (rsm && ((rsm->r_flags & RACK_APP_LIMITED) == 0)) {
17949 if (rack->r_ctl.rc_app_limited_cnt == 0)
17950 rack->r_ctl.rc_end_appl = rack->r_ctl.rc_first_appl = rsm;
17953 * Go out to the end app limited and mark
17954 * this new one as next and move the end_appl up
17957 if (rack->r_ctl.rc_end_appl)
17958 rack->r_ctl.rc_end_appl->r_nseq_appl = rsm->r_start;
17959 rack->r_ctl.rc_end_appl = rsm;
17961 rsm->r_flags |= RACK_APP_LIMITED;
17962 rack->r_ctl.rc_app_limited_cnt++;
17965 rack_log_pacing_delay_calc(rack,
17966 rack->r_ctl.rc_app_limited_cnt, seq,
17967 tp->gput_ack, 0, 0, 4, __LINE__, NULL, 0);
17970 /* Check if we need to go into persists or not */
17971 if ((tp->snd_max == tp->snd_una) &&
17972 TCPS_HAVEESTABLISHED(tp->t_state) &&
17974 (sbavail(sb) > tp->snd_wnd) &&
17975 (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), minseg))) {
17976 /* Yes lets make sure to move to persist before timer-start */
17977 rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime);
17979 rack_start_hpts_timer(rack, tp, cts, slot, tot_len_this_send, sup_rack);
17980 rack_log_type_just_return(rack, cts, tot_len_this_send, slot, hpts_calling, app_limited, cwnd_to_use);
17982 #ifdef NETFLIX_SHARED_CWND
17983 if ((sbavail(sb) == 0) &&
17984 rack->r_ctl.rc_scw) {
17985 tcp_shared_cwnd_idle(rack->r_ctl.rc_scw, rack->r_ctl.rc_scw_index);
17986 rack->rack_scwnd_is_idle = 1;
17989 #ifdef TCP_ACCOUNTING
17990 if (tot_len_this_send > 0) {
17991 crtsc = get_cyclecount();
17992 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
17993 tp->tcp_cnt_counters[SND_OUT_DATA]++;
17995 counter_u64_add(tcp_cnt_counters[SND_OUT_DATA], 1);
17996 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
17997 tp->tcp_proc_time[SND_OUT_DATA] += (crtsc - ts_val);
17999 counter_u64_add(tcp_proc_time[SND_OUT_DATA], (crtsc - ts_val));
18000 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
18001 tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((tot_len_this_send + segsiz - 1) / segsiz);
18003 counter_u64_add(tcp_cnt_counters[CNT_OF_MSS_OUT], ((tot_len_this_send + segsiz - 1) / segsiz));
18005 crtsc = get_cyclecount();
18006 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
18007 tp->tcp_cnt_counters[SND_LIMITED]++;
18009 counter_u64_add(tcp_cnt_counters[SND_LIMITED], 1);
18010 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
18011 tp->tcp_proc_time[SND_LIMITED] += (crtsc - ts_val);
18013 counter_u64_add(tcp_proc_time[SND_LIMITED], (crtsc - ts_val));
18020 if (rsm || sack_rxmit)
18021 counter_u64_add(rack_nfto_resend, 1);
18023 counter_u64_add(rack_non_fto_send, 1);
18024 if ((flags & TH_FIN) &&
18027 * We do not transmit a FIN
18028 * with data outstanding. We
18029 * need to make it so all data
18034 /* Enforce stack imposed max seg size if we have one */
18035 if (rack->r_ctl.rc_pace_max_segs &&
18036 (len > rack->r_ctl.rc_pace_max_segs)) {
18038 len = rack->r_ctl.rc_pace_max_segs;
18040 SOCKBUF_LOCK_ASSERT(sb);
18043 tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT;
18045 tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT;
18048 * Before ESTABLISHED, force sending of initial options unless TCP
18049 * set not to do any options. NOTE: we assume that the IP/TCP header
18050 * plus TCP options always fit in a single mbuf, leaving room for a
18051 * maximum link header, i.e. max_linkhdr + sizeof (struct tcpiphdr)
18052 * + optlen <= MCLBYTES
18057 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
18060 hdrlen = sizeof(struct tcpiphdr);
18063 * Compute options for segment. We only have to care about SYN and
18064 * established connection segments. Options for SYN-ACK segments
18065 * are handled in TCP syncache.
18068 if ((tp->t_flags & TF_NOOPT) == 0) {
18069 /* Maximum segment size. */
18070 if (flags & TH_SYN) {
18071 tp->snd_nxt = tp->iss;
18072 to.to_mss = tcp_mssopt(&inp->inp_inc);
18074 to.to_mss -= V_tcp_udp_tunneling_overhead;
18075 to.to_flags |= TOF_MSS;
18078 * On SYN or SYN|ACK transmits on TFO connections,
18079 * only include the TFO option if it is not a
18080 * retransmit, as the presence of the TFO option may
18081 * have caused the original SYN or SYN|ACK to have
18082 * been dropped by a middlebox.
18084 if (IS_FASTOPEN(tp->t_flags) &&
18085 (tp->t_rxtshift == 0)) {
18086 if (tp->t_state == TCPS_SYN_RECEIVED) {
18087 to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN;
18089 (u_int8_t *)&tp->t_tfo_cookie.server;
18090 to.to_flags |= TOF_FASTOPEN;
18092 } else if (tp->t_state == TCPS_SYN_SENT) {
18094 tp->t_tfo_client_cookie_len;
18096 tp->t_tfo_cookie.client;
18097 to.to_flags |= TOF_FASTOPEN;
18100 * If we wind up having more data to
18101 * send with the SYN than can fit in
18102 * one segment, don't send any more
18103 * until the SYN|ACK comes back from
18110 /* Window scaling. */
18111 if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) {
18112 to.to_wscale = tp->request_r_scale;
18113 to.to_flags |= TOF_SCALE;
18116 if ((tp->t_flags & TF_RCVD_TSTMP) ||
18117 ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) {
18118 to.to_tsval = ms_cts + tp->ts_offset;
18119 to.to_tsecr = tp->ts_recent;
18120 to.to_flags |= TOF_TS;
18122 /* Set receive buffer autosizing timestamp. */
18123 if (tp->rfbuf_ts == 0 &&
18124 (so->so_rcv.sb_flags & SB_AUTOSIZE))
18125 tp->rfbuf_ts = tcp_ts_getticks();
18126 /* Selective ACK's. */
18127 if (tp->t_flags & TF_SACK_PERMIT) {
18128 if (flags & TH_SYN)
18129 to.to_flags |= TOF_SACKPERM;
18130 else if (TCPS_HAVEESTABLISHED(tp->t_state) &&
18131 tp->rcv_numsacks > 0) {
18132 to.to_flags |= TOF_SACK;
18133 to.to_nsacks = tp->rcv_numsacks;
18134 to.to_sacks = (u_char *)tp->sackblks;
18137 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
18138 /* TCP-MD5 (RFC2385). */
18139 if (tp->t_flags & TF_SIGNATURE)
18140 to.to_flags |= TOF_SIGNATURE;
18141 #endif /* TCP_SIGNATURE */
18143 /* Processing the options. */
18144 hdrlen += optlen = tcp_addoptions(&to, opt);
18146 * If we wanted a TFO option to be added, but it was unable
18147 * to fit, ensure no data is sent.
18149 if (IS_FASTOPEN(tp->t_flags) && wanted_cookie &&
18150 !(to.to_flags & TOF_FASTOPEN))
18154 if (V_tcp_udp_tunneling_port == 0) {
18155 /* The port was removed?? */
18156 SOCKBUF_UNLOCK(&so->so_snd);
18157 #ifdef TCP_ACCOUNTING
18158 crtsc = get_cyclecount();
18159 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
18160 tp->tcp_cnt_counters[SND_OUT_FAIL]++;
18162 counter_u64_add(tcp_cnt_counters[SND_OUT_FAIL], 1);
18163 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
18164 tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
18166 counter_u64_add(tcp_proc_time[SND_OUT_FAIL], (crtsc - ts_val));
18169 return (EHOSTUNREACH);
18171 hdrlen += sizeof(struct udphdr);
18175 ipoptlen = ip6_optlen(inp);
18178 if (inp->inp_options)
18179 ipoptlen = inp->inp_options->m_len -
18180 offsetof(struct ipoption, ipopt_list);
18183 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
18184 ipoptlen += ipsec_optlen;
18188 * Adjust data length if insertion of options will bump the packet
18189 * length beyond the t_maxseg length. Clear the FIN bit because we
18190 * cut off the tail of the segment.
18192 if (len + optlen + ipoptlen > tp->t_maxseg) {
18194 uint32_t if_hw_tsomax;
18198 /* extract TSO information */
18199 if_hw_tsomax = tp->t_tsomax;
18200 if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
18201 if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
18202 KASSERT(ipoptlen == 0,
18203 ("%s: TSO can't do IP options", __func__));
18206 * Check if we should limit by maximum payload
18209 if (if_hw_tsomax != 0) {
18210 /* compute maximum TSO length */
18211 max_len = (if_hw_tsomax - hdrlen -
18213 if (max_len <= 0) {
18215 } else if (len > max_len) {
18222 * Prevent the last segment from being fractional
18223 * unless the send sockbuf can be emptied:
18225 max_len = (tp->t_maxseg - optlen);
18226 if ((sb_offset + len) < sbavail(sb)) {
18227 moff = len % (u_int)max_len;
18234 * In case there are too many small fragments don't
18237 if (len <= segsiz) {
18242 * Send the FIN in a separate segment after the bulk
18243 * sending is done. We don't trust the TSO
18244 * implementations to clear the FIN flag on all but
18245 * the last segment.
18247 if (tp->t_flags & TF_NEEDFIN) {
18252 if (optlen + ipoptlen >= tp->t_maxseg) {
18254 * Since we don't have enough space to put
18255 * the IP header chain and the TCP header in
18256 * one packet as required by RFC 7112, don't
18257 * send it. Also ensure that at least one
18258 * byte of the payload can be put into the
18261 SOCKBUF_UNLOCK(&so->so_snd);
18266 len = tp->t_maxseg - optlen - ipoptlen;
18273 KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET,
18274 ("%s: len > IP_MAXPACKET", __func__));
18277 if (max_linkhdr + hdrlen > MCLBYTES)
18279 if (max_linkhdr + hdrlen > MHLEN)
18281 panic("tcphdr too big");
18285 * This KASSERT is here to catch edge cases at a well defined place.
18286 * Before, those had triggered (random) panic conditions further
18289 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__));
18291 (flags & TH_FIN) &&
18294 * We have outstanding data, don't send a fin by itself!.
18299 * Grab a header mbuf, attaching a copy of data to be transmitted,
18300 * and initialize the header from the template for sends on this
18303 hw_tls = (sb->sb_flags & SB_TLS_IFNET) != 0;
18308 if (rack->r_ctl.rc_pace_max_segs)
18309 max_val = rack->r_ctl.rc_pace_max_segs;
18310 else if (rack->rc_user_set_max_segs)
18311 max_val = rack->rc_user_set_max_segs * segsiz;
18315 * We allow a limit on sending with hptsi.
18317 if (len > max_val) {
18322 if (MHLEN < hdrlen + max_linkhdr)
18323 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
18326 m = m_gethdr(M_NOWAIT, MT_DATA);
18329 SOCKBUF_UNLOCK(sb);
18334 m->m_data += max_linkhdr;
18338 * Start the m_copy functions from the closest mbuf to the
18339 * sb_offset in the socket buffer chain.
18341 mb = sbsndptr_noadv(sb, sb_offset, &moff);
18344 if (len <= MHLEN - hdrlen - max_linkhdr && !hw_tls) {
18345 m_copydata(mb, moff, (int)len,
18346 mtod(m, caddr_t)+hdrlen);
18347 if (SEQ_LT(tp->snd_nxt, tp->snd_max))
18348 sbsndptr_adv(sb, mb, len);
18351 struct sockbuf *msb;
18353 if (SEQ_LT(tp->snd_nxt, tp->snd_max))
18357 m->m_next = tcp_m_copym(
18359 if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb,
18360 ((rsm == NULL) ? hw_tls : 0)
18361 #ifdef NETFLIX_COPY_ARGS
18365 if (len <= (tp->t_maxseg - optlen)) {
18367 * Must have ran out of mbufs for the copy
18368 * shorten it to no longer need tso. Lets
18369 * not put on sendalot since we are low on
18374 if (m->m_next == NULL) {
18375 SOCKBUF_UNLOCK(sb);
18382 if (SEQ_LT(tp->snd_nxt, tp->snd_max) || sack_rxmit) {
18383 if (rsm && (rsm->r_flags & RACK_TLP)) {
18385 * TLP should not count in retran count, but
18388 counter_u64_add(rack_tlp_retran, 1);
18389 counter_u64_add(rack_tlp_retran_bytes, len);
18391 tp->t_sndrexmitpack++;
18392 KMOD_TCPSTAT_INC(tcps_sndrexmitpack);
18393 KMOD_TCPSTAT_ADD(tcps_sndrexmitbyte, len);
18396 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB,
18400 KMOD_TCPSTAT_INC(tcps_sndpack);
18401 KMOD_TCPSTAT_ADD(tcps_sndbyte, len);
18403 stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB,
18408 * If we're sending everything we've got, set PUSH. (This
18409 * will keep happy those implementations which only give
18410 * data to the user when a buffer fills or a PUSH comes in.)
18412 if (sb_offset + len == sbused(sb) &&
18414 !(flags & TH_SYN)) {
18416 add_flag |= RACK_HAD_PUSH;
18419 SOCKBUF_UNLOCK(sb);
18421 SOCKBUF_UNLOCK(sb);
18422 if (tp->t_flags & TF_ACKNOW)
18423 KMOD_TCPSTAT_INC(tcps_sndacks);
18424 else if (flags & (TH_SYN | TH_FIN | TH_RST))
18425 KMOD_TCPSTAT_INC(tcps_sndctrl);
18427 KMOD_TCPSTAT_INC(tcps_sndwinup);
18429 m = m_gethdr(M_NOWAIT, MT_DATA);
18436 if (isipv6 && (MHLEN < hdrlen + max_linkhdr) &&
18438 M_ALIGN(m, hdrlen);
18441 m->m_data += max_linkhdr;
18444 SOCKBUF_UNLOCK_ASSERT(sb);
18445 m->m_pkthdr.rcvif = (struct ifnet *)0;
18447 mac_inpcb_create_mbuf(inp, m);
18449 if ((ipoptlen == 0) && (rack->r_ctl.fsb.tcp_ip_hdr) && rack->r_fsb_inited) {
18452 ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
18455 ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
18456 th = rack->r_ctl.fsb.th;
18457 udp = rack->r_ctl.fsb.udp;
18461 ulen = hdrlen + len - sizeof(struct ip6_hdr);
18464 ulen = hdrlen + len - sizeof(struct ip);
18465 udp->uh_ulen = htons(ulen);
18470 ip6 = mtod(m, struct ip6_hdr *);
18472 udp = (struct udphdr *)((caddr_t)ip6 + sizeof(struct ip6_hdr));
18473 udp->uh_sport = htons(V_tcp_udp_tunneling_port);
18474 udp->uh_dport = tp->t_port;
18475 ulen = hdrlen + len - sizeof(struct ip6_hdr);
18476 udp->uh_ulen = htons(ulen);
18477 th = (struct tcphdr *)(udp + 1);
18479 th = (struct tcphdr *)(ip6 + 1);
18480 tcpip_fillheaders(inp, tp->t_port, ip6, th);
18484 ip = mtod(m, struct ip *);
18486 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
18487 udp->uh_sport = htons(V_tcp_udp_tunneling_port);
18488 udp->uh_dport = tp->t_port;
18489 ulen = hdrlen + len - sizeof(struct ip);
18490 udp->uh_ulen = htons(ulen);
18491 th = (struct tcphdr *)(udp + 1);
18493 th = (struct tcphdr *)(ip + 1);
18494 tcpip_fillheaders(inp, tp->t_port, ip, th);
18498 * Fill in fields, remembering maximum advertised window for use in
18499 * delaying messages about window sizes. If resending a FIN, be sure
18500 * not to use a new sequence number.
18502 if (flags & TH_FIN && tp->t_flags & TF_SENTFIN &&
18503 tp->snd_nxt == tp->snd_max)
18506 * If we are starting a connection, send ECN setup SYN packet. If we
18507 * are on a retransmit, we may resend those bits a number of times
18510 if (tp->t_state == TCPS_SYN_SENT && V_tcp_do_ecn) {
18511 flags |= tcp_ecn_output_syn_sent(tp);
18513 /* Also handle parallel SYN for ECN */
18514 if (TCPS_HAVERCVDSYN(tp->t_state) &&
18515 (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
18516 int ect = tcp_ecn_output_established(tp, &flags, len, sack_rxmit);
18517 if ((tp->t_state == TCPS_SYN_RECEIVED) &&
18518 (tp->t_flags2 & TF2_ECN_SND_ECE))
18519 tp->t_flags2 &= ~TF2_ECN_SND_ECE;
18522 ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << 20);
18523 ip6->ip6_flow |= htonl(ect << 20);
18528 ip->ip_tos &= ~IPTOS_ECN_MASK;
18533 * If we are doing retransmissions, then snd_nxt will not reflect
18534 * the first unsent octet. For ACK only packets, we do not want the
18535 * sequence number of the retransmitted packet, we want the sequence
18536 * number of the next unsent octet. So, if there is no data (and no
18537 * SYN or FIN), use snd_max instead of snd_nxt when filling in
18538 * ti_seq. But if we are in persist state, snd_max might reflect
18539 * one byte beyond the right edge of the window, so use snd_nxt in
18540 * that case, since we know we aren't doing a retransmission.
18541 * (retransmit and persist are mutually exclusive...)
18543 if (sack_rxmit == 0) {
18544 if (len || (flags & (TH_SYN | TH_FIN))) {
18545 th->th_seq = htonl(tp->snd_nxt);
18546 rack_seq = tp->snd_nxt;
18548 th->th_seq = htonl(tp->snd_max);
18549 rack_seq = tp->snd_max;
18552 th->th_seq = htonl(rsm->r_start);
18553 rack_seq = rsm->r_start;
18555 th->th_ack = htonl(tp->rcv_nxt);
18556 tcp_set_flags(th, flags);
18558 * Calculate receive window. Don't shrink window, but avoid silly
18560 * If a RST segment is sent, advertise a window of zero.
18562 if (flags & TH_RST) {
18565 if (recwin < (long)(so->so_rcv.sb_hiwat / 4) &&
18566 recwin < (long)segsiz) {
18569 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) &&
18570 recwin < (long)(tp->rcv_adv - tp->rcv_nxt))
18571 recwin = (long)(tp->rcv_adv - tp->rcv_nxt);
18575 * According to RFC1323 the window field in a SYN (i.e., a <SYN> or
18576 * <SYN,ACK>) segment itself is never scaled. The <SYN,ACK> case is
18577 * handled in syncache.
18579 if (flags & TH_SYN)
18580 th->th_win = htons((u_short)
18581 (min(sbspace(&so->so_rcv), TCP_MAXWIN)));
18583 /* Avoid shrinking window with window scaling. */
18584 recwin = roundup2(recwin, 1 << tp->rcv_scale);
18585 th->th_win = htons((u_short)(recwin >> tp->rcv_scale));
18588 * Adjust the RXWIN0SENT flag - indicate that we have advertised a 0
18589 * window. This may cause the remote transmitter to stall. This
18590 * flag tells soreceive() to disable delayed acknowledgements when
18591 * draining the buffer. This can occur if the receiver is
18592 * attempting to read more data than can be buffered prior to
18593 * transmitting on the connection.
18595 if (th->th_win == 0) {
18596 tp->t_sndzerowin++;
18597 tp->t_flags |= TF_RXWIN0SENT;
18599 tp->t_flags &= ~TF_RXWIN0SENT;
18600 tp->snd_up = tp->snd_una; /* drag it along, its deprecated */
18601 /* Now are we using fsb?, if so copy the template data to the mbuf */
18602 if ((ipoptlen == 0) && (rack->r_ctl.fsb.tcp_ip_hdr) && rack->r_fsb_inited) {
18605 cpto = mtod(m, uint8_t *);
18606 memcpy(cpto, rack->r_ctl.fsb.tcp_ip_hdr, rack->r_ctl.fsb.tcp_ip_hdr_len);
18608 * We have just copied in:
18610 * <optional udphdr>
18611 * tcphdr (no options)
18613 * We need to grab the correct pointers into the mbuf
18614 * for both the tcp header, and possibly the udp header (if tunneling).
18615 * We do this by using the offset in the copy buffer and adding it
18616 * to the mbuf base pointer (cpto).
18620 ip6 = mtod(m, struct ip6_hdr *);
18623 ip = mtod(m, struct ip *);
18624 th = (struct tcphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.th - rack->r_ctl.fsb.tcp_ip_hdr));
18625 /* If we have a udp header lets set it into the mbuf as well */
18627 udp = (struct udphdr *)(cpto + ((uint8_t *)rack->r_ctl.fsb.udp - rack->r_ctl.fsb.tcp_ip_hdr));
18629 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
18630 if (to.to_flags & TOF_SIGNATURE) {
18632 * Calculate MD5 signature and put it into the place
18633 * determined before.
18634 * NOTE: since TCP options buffer doesn't point into
18635 * mbuf's data, calculate offset and use it.
18637 if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th,
18638 (u_char *)(th + 1) + (to.to_signature - opt)) != 0) {
18640 * Do not send segment if the calculation of MD5
18641 * digest has failed.
18648 bcopy(opt, th + 1, optlen);
18649 th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
18652 * Put TCP length in extended header, and then checksum extended
18655 m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */
18659 * ip6_plen is not need to be filled now, and will be filled
18663 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
18664 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
18665 udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
18666 th->th_sum = htons(0);
18667 UDPSTAT_INC(udps_opackets);
18669 m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
18670 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
18671 th->th_sum = in6_cksum_pseudo(ip6,
18672 sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP,
18677 #if defined(INET6) && defined(INET)
18683 m->m_pkthdr.csum_flags = CSUM_UDP;
18684 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
18685 udp->uh_sum = in_pseudo(ip->ip_src.s_addr,
18686 ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP));
18687 th->th_sum = htons(0);
18688 UDPSTAT_INC(udps_opackets);
18690 m->m_pkthdr.csum_flags = CSUM_TCP;
18691 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
18692 th->th_sum = in_pseudo(ip->ip_src.s_addr,
18693 ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) +
18694 IPPROTO_TCP + len + optlen));
18696 /* IP version must be set here for ipv4/ipv6 checking later */
18697 KASSERT(ip->ip_v == IPVERSION,
18698 ("%s: IP version incorrect: %d", __func__, ip->ip_v));
18702 * Enable TSO and specify the size of the segments. The TCP pseudo
18703 * header checksum is always provided. XXX: Fixme: This is currently
18704 * not the case for IPv6.
18707 KASSERT(len > tp->t_maxseg - optlen,
18708 ("%s: len <= tso_segsz", __func__));
18709 m->m_pkthdr.csum_flags |= CSUM_TSO;
18710 m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen;
18712 KASSERT(len + hdrlen == m_length(m, NULL),
18713 ("%s: mbuf chain different than expected: %d + %u != %u",
18714 __func__, len, hdrlen, m_length(m, NULL)));
18717 /* Run HHOOK_TCP_ESTABLISHED_OUT helper hooks. */
18718 hhook_run_tcp_est_out(tp, th, &to, len, tso);
18720 /* We're getting ready to send; log now. */
18721 if (tp->t_logstate != TCP_LOG_STATE_OFF) {
18722 union tcp_log_stackspecific log;
18724 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
18725 log.u_bbr.inhpts = tcp_in_hpts(rack->rc_inp);
18726 if (rack->rack_no_prr)
18727 log.u_bbr.flex1 = 0;
18729 log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt;
18730 log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs;
18731 log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs;
18732 log.u_bbr.flex4 = orig_len;
18733 /* Save off the early/late values */
18734 log.u_bbr.flex6 = rack->r_ctl.rc_agg_early;
18735 log.u_bbr.applimited = rack->r_ctl.rc_agg_delayed;
18736 log.u_bbr.bw_inuse = rack_get_bw(rack);
18737 log.u_bbr.flex8 = 0;
18739 if (rsm->r_flags & RACK_RWND_COLLAPSED) {
18740 rack_log_collapse(rack, rsm->r_start, rsm->r_end, 0, __LINE__, 5, rsm->r_flags, rsm);
18741 counter_u64_add(rack_collapsed_win_rxt, 1);
18742 counter_u64_add(rack_collapsed_win_rxt_bytes, (rsm->r_end - rsm->r_start));
18745 log.u_bbr.flex8 = 2;
18747 log.u_bbr.flex8 = 1;
18750 log.u_bbr.flex8 = 3;
18752 log.u_bbr.flex8 = 0;
18754 log.u_bbr.pacing_gain = rack_get_output_gain(rack, rsm);
18755 log.u_bbr.flex7 = mark;
18756 log.u_bbr.flex7 <<= 8;
18757 log.u_bbr.flex7 |= pass;
18758 log.u_bbr.pkts_out = tp->t_maxseg;
18759 log.u_bbr.timeStamp = cts;
18760 log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
18761 log.u_bbr.lt_epoch = cwnd_to_use;
18762 log.u_bbr.delivered = sendalot;
18763 lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK,
18764 len, &log, false, NULL, NULL, 0, &tv);
18769 * Fill in IP length and desired time to live and send to IP level.
18770 * There should be a better way to handle ttl and tos; we could keep
18771 * them in the template, but need a way to checksum without them.
18774 * m->m_pkthdr.len should have been set before cksum calcuration,
18775 * because in6_cksum() need it.
18780 * we separately set hoplimit for every segment, since the
18781 * user might want to change the value via setsockopt. Also,
18782 * desired default hop limit might be changed via Neighbor
18785 rack->r_ctl.fsb.hoplimit = ip6->ip6_hlim = in6_selecthlim(inp, NULL);
18788 * Set the packet size here for the benefit of DTrace
18789 * probes. ip6_output() will set it properly; it's supposed
18790 * to include the option header lengths as well.
18792 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
18794 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss)
18795 tp->t_flags2 |= TF2_PLPMTU_PMTUD;
18797 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
18799 if (tp->t_state == TCPS_SYN_SENT)
18800 TCP_PROBE5(connect__request, NULL, tp, ip6, tp, th);
18802 TCP_PROBE5(send, NULL, tp, ip6, tp, th);
18803 /* TODO: IPv6 IP6TOS_ECT bit on */
18804 error = ip6_output(m,
18805 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
18806 inp->in6p_outputopts,
18811 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0),
18814 if (error == EMSGSIZE && inp->inp_route6.ro_nh != NULL)
18815 mtu = inp->inp_route6.ro_nh->nh_mtu;
18818 #if defined(INET) && defined(INET6)
18823 ip->ip_len = htons(m->m_pkthdr.len);
18825 if (inp->inp_vflag & INP_IPV6PROTO)
18826 ip->ip_ttl = in6_selecthlim(inp, NULL);
18828 rack->r_ctl.fsb.hoplimit = ip->ip_ttl;
18830 * If we do path MTU discovery, then we set DF on every
18831 * packet. This might not be the best thing to do according
18832 * to RFC3390 Section 2. However the tcp hostcache migitates
18833 * the problem so it affects only the first tcp connection
18836 * NB: Don't set DF on small MTU/MSS to have a safe
18839 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) {
18840 tp->t_flags2 |= TF2_PLPMTU_PMTUD;
18841 if (tp->t_port == 0 || len < V_tcp_minmss) {
18842 ip->ip_off |= htons(IP_DF);
18845 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
18848 if (tp->t_state == TCPS_SYN_SENT)
18849 TCP_PROBE5(connect__request, NULL, tp, ip, tp, th);
18851 TCP_PROBE5(send, NULL, tp, ip, tp, th);
18853 error = ip_output(m,
18854 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
18860 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 0,
18862 if (error == EMSGSIZE && inp->inp_route.ro_nh != NULL)
18863 mtu = inp->inp_route.ro_nh->nh_mtu;
18869 lgb->tlb_errno = error;
18873 * In transmit state, time the transmission and arrange for the
18874 * retransmit. In persist state, just set snd_max.
18877 tcp_account_for_send(tp, len, (rsm != NULL), doing_tlp, hw_tls);
18878 if (rsm && doing_tlp) {
18879 rack->rc_last_sent_tlp_past_cumack = 0;
18880 rack->rc_last_sent_tlp_seq_valid = 1;
18881 rack->r_ctl.last_sent_tlp_seq = rsm->r_start;
18882 rack->r_ctl.last_sent_tlp_len = rsm->r_end - rsm->r_start;
18884 rack->forced_ack = 0; /* If we send something zap the FA flag */
18885 if (rsm && (doing_tlp == 0)) {
18886 /* Set we retransmitted */
18887 rack->rc_gp_saw_rec = 1;
18889 if (cwnd_to_use > tp->snd_ssthresh) {
18890 /* Set we sent in CA */
18891 rack->rc_gp_saw_ca = 1;
18893 /* Set we sent in SS */
18894 rack->rc_gp_saw_ss = 1;
18897 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
18898 (tp->t_flags & TF_SACK_PERMIT) &&
18899 tp->rcv_numsacks > 0)
18900 tcp_clean_dsack_blocks(tp);
18901 tot_len_this_send += len;
18903 counter_u64_add(rack_out_size[TCP_MSS_ACCT_SNDACK], 1);
18904 else if (len == 1) {
18905 counter_u64_add(rack_out_size[TCP_MSS_ACCT_PERSIST], 1);
18906 } else if (len > 1) {
18909 idx = (len / segsiz) + 3;
18910 if (idx >= TCP_MSS_ACCT_ATIMER)
18911 counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1);
18913 counter_u64_add(rack_out_size[idx], 1);
18916 if ((rack->rack_no_prr == 0) &&
18919 if (rack->r_ctl.rc_prr_sndcnt >= len)
18920 rack->r_ctl.rc_prr_sndcnt -= len;
18922 rack->r_ctl.rc_prr_sndcnt = 0;
18926 /* Make sure the TLP is added */
18927 add_flag |= RACK_TLP;
18929 /* If its a resend without TLP then it must not have the flag */
18930 rsm->r_flags &= ~RACK_TLP;
18932 rack_log_output(tp, &to, len, rack_seq, (uint8_t) flags, error,
18933 rack_to_usec_ts(&tv),
18934 rsm, add_flag, s_mb, s_moff, hw_tls);
18937 if ((error == 0) &&
18939 (tp->snd_una == tp->snd_max))
18940 rack->r_ctl.rc_tlp_rxt_last_time = cts;
18942 tcp_seq startseq = tp->snd_nxt;
18944 /* Track our lost count */
18945 if (rsm && (doing_tlp == 0))
18946 rack->r_ctl.rc_loss_count += rsm->r_end - rsm->r_start;
18948 * Advance snd_nxt over sequence space of this segment.
18951 /* We don't log or do anything with errors */
18953 if (doing_tlp == 0) {
18956 * Not a retransmission of some
18957 * sort, new data is going out so
18958 * clear our TLP count and flag.
18960 rack->rc_tlp_in_progress = 0;
18961 rack->r_ctl.rc_tlp_cnt_out = 0;
18965 * We have just sent a TLP, mark that it is true
18966 * and make sure our in progress is set so we
18967 * continue to check the count.
18969 rack->rc_tlp_in_progress = 1;
18970 rack->r_ctl.rc_tlp_cnt_out++;
18972 if (flags & (TH_SYN | TH_FIN)) {
18973 if (flags & TH_SYN)
18975 if (flags & TH_FIN) {
18977 tp->t_flags |= TF_SENTFIN;
18980 /* In the ENOBUFS case we do *not* update snd_max */
18984 tp->snd_nxt += len;
18985 if (SEQ_GT(tp->snd_nxt, tp->snd_max)) {
18986 if (tp->snd_una == tp->snd_max) {
18988 * Update the time we just added data since
18989 * none was outstanding.
18991 rack_log_progress_event(rack, tp, ticks, PROGRESS_START, __LINE__);
18992 tp->t_acktime = ticks;
18994 tp->snd_max = tp->snd_nxt;
18996 * Time this transmission if not a retransmission and
18997 * not currently timing anything.
18998 * This is only relevant in case of switching back to
19001 if (tp->t_rtttime == 0) {
19002 tp->t_rtttime = ticks;
19003 tp->t_rtseq = startseq;
19004 KMOD_TCPSTAT_INC(tcps_segstimed);
19007 ((tp->t_flags & TF_GPUTINPROG) == 0))
19008 rack_start_gp_measurement(tp, rack, startseq, sb_offset);
19011 * If we are doing FO we need to update the mbuf position and subtract
19012 * this happens when the peer sends us duplicate information and
19013 * we thus want to send a DSACK.
19015 * XXXRRS: This brings to mind a ?, when we send a DSACK block is TSO
19016 * turned off? If not then we are going to echo multiple DSACK blocks
19017 * out (with the TSO), which we should not be doing.
19019 if (rack->r_fast_output && len) {
19020 if (rack->r_ctl.fsb.left_to_send > len)
19021 rack->r_ctl.fsb.left_to_send -= len;
19023 rack->r_ctl.fsb.left_to_send = 0;
19024 if (rack->r_ctl.fsb.left_to_send < segsiz)
19025 rack->r_fast_output = 0;
19026 if (rack->r_fast_output) {
19027 rack->r_ctl.fsb.m = sbsndmbuf(sb, (tp->snd_max - tp->snd_una), &rack->r_ctl.fsb.off);
19028 rack->r_ctl.fsb.o_m_len = rack->r_ctl.fsb.m->m_len;
19034 rack->r_ctl.rc_agg_delayed = 0;
19037 rack->r_ctl.rc_agg_early = 0;
19038 SOCKBUF_UNLOCK_ASSERT(sb); /* Check gotos. */
19040 * Failures do not advance the seq counter above. For the
19041 * case of ENOBUFS we will fall out and retry in 1ms with
19042 * the hpts. Everything else will just have to retransmit
19045 * In any case, we do not want to loop around for another
19046 * send without a good reason.
19051 tp->t_softerror = error;
19052 #ifdef TCP_ACCOUNTING
19053 crtsc = get_cyclecount();
19054 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19055 tp->tcp_cnt_counters[SND_OUT_FAIL]++;
19057 counter_u64_add(tcp_cnt_counters[SND_OUT_FAIL], 1);
19058 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19059 tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
19061 counter_u64_add(tcp_proc_time[SND_OUT_FAIL], (crtsc - ts_val));
19067 * Pace us right away to retry in a some
19070 if (rack->r_ctl.crte != NULL) {
19071 rack_trace_point(rack, RACK_TP_HWENOBUF);
19073 rack_trace_point(rack, RACK_TP_ENOBUF);
19074 slot = ((1 + rack->rc_enobuf) * HPTS_USEC_IN_MSEC);
19075 if (rack->rc_enobuf < 0x7f)
19077 if (slot < (10 * HPTS_USEC_IN_MSEC))
19078 slot = 10 * HPTS_USEC_IN_MSEC;
19079 if (rack->r_ctl.crte != NULL) {
19080 counter_u64_add(rack_saw_enobuf_hw, 1);
19081 tcp_rl_log_enobuf(rack->r_ctl.crte);
19083 counter_u64_add(rack_saw_enobuf, 1);
19087 * For some reason the interface we used initially
19088 * to send segments changed to another or lowered
19089 * its MTU. If TSO was active we either got an
19090 * interface without TSO capabilits or TSO was
19091 * turned off. If we obtained mtu from ip_output()
19092 * then update it and try again.
19095 tp->t_flags &= ~TF_TSO;
19097 tcp_mss_update(tp, -1, mtu, NULL, NULL);
19100 slot = 10 * HPTS_USEC_IN_MSEC;
19101 rack_start_hpts_timer(rack, tp, cts, slot, 0, 0);
19102 #ifdef TCP_ACCOUNTING
19103 crtsc = get_cyclecount();
19104 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19105 tp->tcp_cnt_counters[SND_OUT_FAIL]++;
19107 counter_u64_add(tcp_cnt_counters[SND_OUT_FAIL], 1);
19108 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19109 tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
19111 counter_u64_add(tcp_proc_time[SND_OUT_FAIL], (crtsc - ts_val));
19116 counter_u64_add(rack_saw_enetunreach, 1);
19120 if (TCPS_HAVERCVDSYN(tp->t_state)) {
19121 tp->t_softerror = error;
19125 slot = 10 * HPTS_USEC_IN_MSEC;
19126 rack_start_hpts_timer(rack, tp, cts, slot, 0, 0);
19127 #ifdef TCP_ACCOUNTING
19128 crtsc = get_cyclecount();
19129 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19130 tp->tcp_cnt_counters[SND_OUT_FAIL]++;
19132 counter_u64_add(tcp_cnt_counters[SND_OUT_FAIL], 1);
19133 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19134 tp->tcp_proc_time[SND_OUT_FAIL] += (crtsc - ts_val);
19136 counter_u64_add(tcp_proc_time[SND_OUT_FAIL], (crtsc - ts_val));
19142 rack->rc_enobuf = 0;
19143 if (IN_FASTRECOVERY(tp->t_flags) && rsm)
19144 rack->r_ctl.retran_during_recovery += len;
19146 KMOD_TCPSTAT_INC(tcps_sndtotal);
19149 * Data sent (as far as we can tell). If this advertises a larger
19150 * window than any other segment, then remember the size of the
19151 * advertised window. Any pending ACK has now been sent.
19153 if (recwin > 0 && SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv))
19154 tp->rcv_adv = tp->rcv_nxt + recwin;
19156 tp->last_ack_sent = tp->rcv_nxt;
19157 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
19160 /* Do we need to turn off sendalot? */
19161 if (rack->r_ctl.rc_pace_max_segs &&
19162 (tot_len_this_send >= rack->r_ctl.rc_pace_max_segs)) {
19163 /* We hit our max. */
19165 } else if ((rack->rc_user_set_max_segs) &&
19166 (tot_len_this_send >= (rack->rc_user_set_max_segs * segsiz))) {
19167 /* We hit the user defined max */
19171 if ((error == 0) && (flags & TH_FIN))
19172 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_FIN);
19173 if (flags & TH_RST) {
19175 * We don't send again after sending a RST.
19180 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
19181 } else if ((slot == 0) && (sendalot == 0) && tot_len_this_send) {
19183 * Get our pacing rate, if an error
19184 * occurred in sending (ENOBUF) we would
19185 * hit the else if with slot preset. Other
19188 slot = rack_get_pacing_delay(rack, tp, tot_len_this_send, rsm, segsiz);
19191 (rsm->r_flags & RACK_HAS_SYN) == 0 &&
19192 rack->use_rack_rr) {
19193 /* Its a retransmit and we use the rack cheat? */
19195 (rack->rc_always_pace == 0) ||
19196 (rack->r_rr_config == 1)) {
19198 * We have no pacing set or we
19199 * are using old-style rack or
19200 * we are overridden to use the old 1ms pacing.
19202 slot = rack->r_ctl.rc_min_to;
19205 /* We have sent clear the flag */
19206 rack->r_ent_rec_ns = 0;
19207 if (rack->r_must_retran) {
19209 rack->r_ctl.rc_out_at_rto -= (rsm->r_end - rsm->r_start);
19210 if (SEQ_GEQ(rsm->r_end, rack->r_ctl.rc_snd_max_at_rto)) {
19212 * We have retransmitted all.
19214 rack->r_must_retran = 0;
19215 rack->r_ctl.rc_out_at_rto = 0;
19217 } else if (SEQ_GEQ(tp->snd_max, rack->r_ctl.rc_snd_max_at_rto)) {
19219 * Sending new data will also kill
19222 rack->r_must_retran = 0;
19223 rack->r_ctl.rc_out_at_rto = 0;
19226 rack->r_ctl.fsb.recwin = recwin;
19227 if ((tp->t_flags & (TF_WASCRECOVERY|TF_WASFRECOVERY)) &&
19228 SEQ_GT(tp->snd_max, rack->r_ctl.rc_snd_max_at_rto)) {
19230 * We hit an RTO and now have past snd_max at the RTO
19231 * clear all the WAS flags.
19233 tp->t_flags &= ~(TF_WASCRECOVERY|TF_WASFRECOVERY);
19236 /* set the rack tcb into the slot N */
19237 if ((error == 0) &&
19239 ((flags & (TH_SYN|TH_FIN)) == 0) &&
19241 (tp->snd_nxt == tp->snd_max) &&
19243 (tp->rcv_numsacks == 0) &&
19244 rack->r_fsb_inited &&
19245 TCPS_HAVEESTABLISHED(tp->t_state) &&
19246 (rack->r_must_retran == 0) &&
19247 ((tp->t_flags & TF_NEEDFIN) == 0) &&
19248 (len > 0) && (orig_len > 0) &&
19249 (orig_len > len) &&
19250 ((orig_len - len) >= segsiz) &&
19252 ((optlen == TCPOLEN_TSTAMP_APPA) && (to.to_flags & TOF_TS)))) {
19253 /* We can send at least one more MSS using our fsb */
19255 rack->r_fast_output = 1;
19256 rack->r_ctl.fsb.m = sbsndmbuf(sb, (tp->snd_max - tp->snd_una), &rack->r_ctl.fsb.off);
19257 rack->r_ctl.fsb.o_m_len = rack->r_ctl.fsb.m->m_len;
19258 rack->r_ctl.fsb.tcp_flags = flags;
19259 rack->r_ctl.fsb.left_to_send = orig_len - len;
19261 rack->r_ctl.fsb.hw_tls = 1;
19263 rack->r_ctl.fsb.hw_tls = 0;
19264 KASSERT((rack->r_ctl.fsb.left_to_send <= (sbavail(sb) - (tp->snd_max - tp->snd_una))),
19265 ("rack:%p left_to_send:%u sbavail:%u out:%u",
19266 rack, rack->r_ctl.fsb.left_to_send, sbavail(sb),
19267 (tp->snd_max - tp->snd_una)));
19268 if (rack->r_ctl.fsb.left_to_send < segsiz)
19269 rack->r_fast_output = 0;
19271 if (rack->r_ctl.fsb.left_to_send == (sbavail(sb) - (tp->snd_max - tp->snd_una)))
19272 rack->r_ctl.fsb.rfo_apply_push = 1;
19274 rack->r_ctl.fsb.rfo_apply_push = 0;
19277 rack->r_fast_output = 0;
19278 rack_log_fsb(rack, tp, so, flags,
19279 ipoptlen, orig_len, len, error,
19280 (rsm == NULL), optlen, __LINE__, 2);
19281 } else if (sendalot) {
19285 if ((error == 0) &&
19287 ((flags & (TH_SYN|TH_FIN)) == 0) &&
19290 (tp->rcv_numsacks == 0) &&
19291 (tp->snd_nxt == tp->snd_max) &&
19292 (rack->r_must_retran == 0) &&
19293 rack->r_fsb_inited &&
19294 TCPS_HAVEESTABLISHED(tp->t_state) &&
19295 ((tp->t_flags & TF_NEEDFIN) == 0) &&
19296 (len > 0) && (orig_len > 0) &&
19297 (orig_len > len) &&
19298 ((orig_len - len) >= segsiz) &&
19300 ((optlen == TCPOLEN_TSTAMP_APPA) && (to.to_flags & TOF_TS)))) {
19301 /* we can use fast_output for more */
19303 rack->r_fast_output = 1;
19304 rack->r_ctl.fsb.m = sbsndmbuf(sb, (tp->snd_max - tp->snd_una), &rack->r_ctl.fsb.off);
19305 rack->r_ctl.fsb.o_m_len = rack->r_ctl.fsb.m->m_len;
19306 rack->r_ctl.fsb.tcp_flags = flags;
19307 rack->r_ctl.fsb.left_to_send = orig_len - len;
19309 rack->r_ctl.fsb.hw_tls = 1;
19311 rack->r_ctl.fsb.hw_tls = 0;
19312 KASSERT((rack->r_ctl.fsb.left_to_send <= (sbavail(sb) - (tp->snd_max - tp->snd_una))),
19313 ("rack:%p left_to_send:%u sbavail:%u out:%u",
19314 rack, rack->r_ctl.fsb.left_to_send, sbavail(sb),
19315 (tp->snd_max - tp->snd_una)));
19316 if (rack->r_ctl.fsb.left_to_send < segsiz) {
19317 rack->r_fast_output = 0;
19319 if (rack->r_fast_output) {
19320 if (rack->r_ctl.fsb.left_to_send == (sbavail(sb) - (tp->snd_max - tp->snd_una)))
19321 rack->r_ctl.fsb.rfo_apply_push = 1;
19323 rack->r_ctl.fsb.rfo_apply_push = 0;
19324 rack_log_fsb(rack, tp, so, flags,
19325 ipoptlen, orig_len, len, error,
19326 (rsm == NULL), optlen, __LINE__, 3);
19328 ret = rack_fast_output(tp, rack, ts_val, cts, ms_cts, &tv, tot_len_this_send, &error);
19338 /* Assure when we leave that snd_nxt will point to top */
19339 if (SEQ_GT(tp->snd_max, tp->snd_nxt))
19340 tp->snd_nxt = tp->snd_max;
19341 rack_start_hpts_timer(rack, tp, cts, slot, tot_len_this_send, 0);
19342 #ifdef TCP_ACCOUNTING
19343 crtsc = get_cyclecount() - ts_val;
19344 if (tot_len_this_send) {
19345 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19346 tp->tcp_cnt_counters[SND_OUT_DATA]++;
19348 counter_u64_add(tcp_cnt_counters[SND_OUT_DATA], 1);
19349 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19350 tp->tcp_proc_time[SND_OUT_DATA] += crtsc;
19352 counter_u64_add(tcp_proc_time[SND_OUT_DATA], crtsc);
19353 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19354 tp->tcp_cnt_counters[CNT_OF_MSS_OUT] += ((tot_len_this_send + segsiz - 1) /segsiz);
19356 counter_u64_add(tcp_cnt_counters[CNT_OF_MSS_OUT], ((tot_len_this_send + segsiz - 1) /segsiz));
19358 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19359 tp->tcp_cnt_counters[SND_OUT_ACK]++;
19361 counter_u64_add(tcp_cnt_counters[SND_OUT_ACK], 1);
19362 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
19363 tp->tcp_proc_time[SND_OUT_ACK] += crtsc;
19365 counter_u64_add(tcp_proc_time[SND_OUT_ACK], crtsc);
19369 if (error == ENOBUFS)
19375 rack_update_seg(struct tcp_rack *rack)
19379 orig_val = rack->r_ctl.rc_pace_max_segs;
19380 rack_set_pace_segments(rack->rc_tp, rack, __LINE__, NULL);
19381 if (orig_val != rack->r_ctl.rc_pace_max_segs)
19382 rack_log_pacing_delay_calc(rack, 0, 0, orig_val, 0, 0, 15, __LINE__, NULL, 0);
19386 rack_mtu_change(struct tcpcb *tp)
19389 * The MSS may have changed
19391 struct tcp_rack *rack;
19392 struct rack_sendmap *rsm;
19394 rack = (struct tcp_rack *)tp->t_fb_ptr;
19395 if (rack->r_ctl.rc_pace_min_segs != ctf_fixed_maxseg(tp)) {
19397 * The MTU has changed we need to resend everything
19398 * since all we have sent is lost. We first fix
19399 * up the mtu though.
19401 rack_set_pace_segments(tp, rack, __LINE__, NULL);
19402 /* We treat this like a full retransmit timeout without the cwnd adjustment */
19403 rack_remxt_tmr(tp);
19404 rack->r_fast_output = 0;
19405 rack->r_ctl.rc_out_at_rto = ctf_flight_size(tp,
19406 rack->r_ctl.rc_sacked);
19407 rack->r_ctl.rc_snd_max_at_rto = tp->snd_max;
19408 rack->r_must_retran = 1;
19409 /* Mark all inflight to needing to be rxt'd */
19410 TAILQ_FOREACH(rsm, &rack->r_ctl.rc_tmap, r_tnext) {
19411 rsm->r_flags |= RACK_MUST_RXT;
19414 sack_filter_clear(&rack->r_ctl.rack_sf, tp->snd_una);
19415 /* We don't use snd_nxt to retransmit */
19416 tp->snd_nxt = tp->snd_max;
19420 rack_set_profile(struct tcp_rack *rack, int prof)
19424 /* pace_always=1 */
19425 if (rack->rc_always_pace == 0) {
19426 if (tcp_can_enable_pacing() == 0)
19429 rack->rc_always_pace = 1;
19430 if (rack->use_fixed_rate || rack->gp_ready)
19431 rack_set_cc_pacing(rack);
19432 rack->rc_inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
19433 rack->rack_attempt_hdwr_pace = 0;
19435 if (rack_use_cmp_acks)
19436 rack->r_use_cmp_ack = 1;
19437 if (TCPS_HAVEESTABLISHED(rack->rc_tp->t_state) &&
19438 rack->r_use_cmp_ack)
19439 rack->rc_inp->inp_flags2 |= INP_MBUF_ACKCMP;
19441 rack->rack_enable_scwnd = 1;
19443 rack->rc_gp_dyn_mul = 1;
19445 rack->r_ctl.rack_per_of_gp_ca = 100;
19447 rack->r_rr_config = 3;
19449 rack->r_ctl.rc_no_push_at_mrtt = 2;
19451 rack->rc_pace_to_cwnd = 1;
19452 rack->rc_pace_fill_if_rttin_range = 0;
19453 rack->rtt_limit_mul = 0;
19455 rack->rack_no_prr = 1;
19457 rack->r_limit_scw = 1;
19459 rack->r_ctl.rack_per_of_gp_rec = 90;
19462 } else if (prof == 3) {
19463 /* Same as profile one execept fill_cw becomes 2 (less aggressive set) */
19464 /* pace_always=1 */
19465 if (rack->rc_always_pace == 0) {
19466 if (tcp_can_enable_pacing() == 0)
19469 rack->rc_always_pace = 1;
19470 if (rack->use_fixed_rate || rack->gp_ready)
19471 rack_set_cc_pacing(rack);
19472 rack->rc_inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
19473 rack->rack_attempt_hdwr_pace = 0;
19475 if (rack_use_cmp_acks)
19476 rack->r_use_cmp_ack = 1;
19477 if (TCPS_HAVEESTABLISHED(rack->rc_tp->t_state) &&
19478 rack->r_use_cmp_ack)
19479 rack->rc_inp->inp_flags2 |= INP_MBUF_ACKCMP;
19481 rack->rack_enable_scwnd = 1;
19483 rack->rc_gp_dyn_mul = 1;
19485 rack->r_ctl.rack_per_of_gp_ca = 100;
19487 rack->r_rr_config = 3;
19489 rack->r_ctl.rc_no_push_at_mrtt = 2;
19491 rack->rc_pace_to_cwnd = 1;
19492 rack->r_fill_less_agg = 1;
19493 rack->rc_pace_fill_if_rttin_range = 0;
19494 rack->rtt_limit_mul = 0;
19496 rack->rack_no_prr = 1;
19498 rack->r_limit_scw = 1;
19500 rack->r_ctl.rack_per_of_gp_rec = 90;
19504 } else if (prof == 2) {
19506 if (rack->rc_always_pace == 0) {
19507 if (tcp_can_enable_pacing() == 0)
19510 rack->rc_always_pace = 1;
19511 if (rack->use_fixed_rate || rack->gp_ready)
19512 rack_set_cc_pacing(rack);
19513 rack->r_use_cmp_ack = 1;
19514 if (TCPS_HAVEESTABLISHED(rack->rc_tp->t_state))
19515 rack->rc_inp->inp_flags2 |= INP_MBUF_ACKCMP;
19516 /* pace_always=1 */
19517 rack->rc_inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
19519 rack->rack_enable_scwnd = 1;
19521 rack->rc_gp_dyn_mul = 1;
19522 rack->r_ctl.rack_per_of_gp_ca = 100;
19524 rack->r_rr_config = 3;
19526 rack->r_ctl.rc_no_push_at_mrtt = 2;
19528 rack->rc_pace_to_cwnd = 1;
19529 rack->rc_pace_fill_if_rttin_range = 0;
19530 rack->rtt_limit_mul = 0;
19532 rack->rack_no_prr = 1;
19534 rack->r_limit_scw = 0;
19536 } else if (prof == 0) {
19537 /* This changes things back to the default settings */
19539 if (rack->rc_always_pace) {
19540 tcp_decrement_paced_conn();
19541 rack_undo_cc_pacing(rack);
19542 rack->rc_always_pace = 0;
19544 if (rack_pace_every_seg && tcp_can_enable_pacing()) {
19545 rack->rc_always_pace = 1;
19546 if (rack->use_fixed_rate || rack->gp_ready)
19547 rack_set_cc_pacing(rack);
19549 rack->rc_always_pace = 0;
19550 if (rack_dsack_std_based & 0x1) {
19551 /* Basically this means all rack timers are at least (srtt + 1/4 srtt) */
19552 rack->rc_rack_tmr_std_based = 1;
19554 if (rack_dsack_std_based & 0x2) {
19555 /* Basically this means rack timers are extended based on dsack by up to (2 * srtt) */
19556 rack->rc_rack_use_dsack = 1;
19558 if (rack_use_cmp_acks)
19559 rack->r_use_cmp_ack = 1;
19561 rack->r_use_cmp_ack = 0;
19562 if (rack_disable_prr)
19563 rack->rack_no_prr = 1;
19565 rack->rack_no_prr = 0;
19566 if (rack_gp_no_rec_chg)
19567 rack->rc_gp_no_rec_chg = 1;
19569 rack->rc_gp_no_rec_chg = 0;
19570 if (rack_enable_mqueue_for_nonpaced || rack->r_use_cmp_ack) {
19571 rack->r_mbuf_queue = 1;
19572 if (TCPS_HAVEESTABLISHED(rack->rc_tp->t_state))
19573 rack->rc_inp->inp_flags2 |= INP_MBUF_ACKCMP;
19574 rack->rc_inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
19576 rack->r_mbuf_queue = 0;
19577 rack->rc_inp->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
19579 if (rack_enable_shared_cwnd)
19580 rack->rack_enable_scwnd = 1;
19582 rack->rack_enable_scwnd = 0;
19583 if (rack_do_dyn_mul) {
19584 /* When dynamic adjustment is on CA needs to start at 100% */
19585 rack->rc_gp_dyn_mul = 1;
19586 if (rack_do_dyn_mul >= 100)
19587 rack->r_ctl.rack_per_of_gp_ca = rack_do_dyn_mul;
19589 rack->r_ctl.rack_per_of_gp_ca = rack_per_of_gp_ca;
19590 rack->rc_gp_dyn_mul = 0;
19592 rack->r_rr_config = 0;
19593 rack->r_ctl.rc_no_push_at_mrtt = 0;
19594 rack->rc_pace_to_cwnd = 0;
19595 rack->rc_pace_fill_if_rttin_range = 0;
19596 rack->rtt_limit_mul = 0;
19598 if (rack_enable_hw_pacing)
19599 rack->rack_hdw_pace_ena = 1;
19601 rack->rack_hdw_pace_ena = 0;
19602 if (rack_disable_prr)
19603 rack->rack_no_prr = 1;
19605 rack->rack_no_prr = 0;
19606 if (rack_limits_scwnd)
19607 rack->r_limit_scw = 1;
19609 rack->r_limit_scw = 0;
19616 rack_add_deferred_option(struct tcp_rack *rack, int sopt_name, uint64_t loptval)
19618 struct deferred_opt_list *dol;
19620 dol = malloc(sizeof(struct deferred_opt_list),
19621 M_TCPFSB, M_NOWAIT|M_ZERO);
19624 * No space yikes -- fail out..
19628 dol->optname = sopt_name;
19629 dol->optval = loptval;
19630 TAILQ_INSERT_TAIL(&rack->r_ctl.opt_list, dol, next);
19635 rack_process_option(struct tcpcb *tp, struct tcp_rack *rack, int sopt_name,
19636 uint32_t optval, uint64_t loptval)
19638 struct epoch_tracker et;
19639 struct sockopt sopt;
19640 struct cc_newreno_opts opt;
19641 struct inpcb *inp = tptoinpcb(tp);
19646 switch (sopt_name) {
19648 case TCP_RACK_DSACK_OPT:
19649 RACK_OPTS_INC(tcp_rack_dsack_opt);
19650 if (optval & 0x1) {
19651 rack->rc_rack_tmr_std_based = 1;
19653 rack->rc_rack_tmr_std_based = 0;
19655 if (optval & 0x2) {
19656 rack->rc_rack_use_dsack = 1;
19658 rack->rc_rack_use_dsack = 0;
19660 rack_log_dsack_event(rack, 5, __LINE__, 0, 0);
19662 case TCP_RACK_PACING_BETA:
19663 RACK_OPTS_INC(tcp_rack_beta);
19664 if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0) {
19665 /* This only works for newreno. */
19669 if (rack->rc_pacing_cc_set) {
19671 * Set them into the real CC module
19672 * whats in the rack pcb is the old values
19673 * to be used on restoral/
19675 sopt.sopt_dir = SOPT_SET;
19676 opt.name = CC_NEWRENO_BETA;
19678 if (CC_ALGO(tp)->ctl_output != NULL)
19679 error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
19686 * Not pacing yet so set it into our local
19687 * rack pcb storage.
19689 rack->r_ctl.rc_saved_beta.beta = optval;
19692 case TCP_RACK_TIMER_SLOP:
19693 RACK_OPTS_INC(tcp_rack_timer_slop);
19694 rack->r_ctl.timer_slop = optval;
19695 if (rack->rc_tp->t_srtt) {
19697 * If we have an SRTT lets update t_rxtcur
19698 * to have the new slop.
19700 RACK_TCPT_RANGESET(tp->t_rxtcur, RACK_REXMTVAL(tp),
19701 rack_rto_min, rack_rto_max,
19702 rack->r_ctl.timer_slop);
19705 case TCP_RACK_PACING_BETA_ECN:
19706 RACK_OPTS_INC(tcp_rack_beta_ecn);
19707 if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0) {
19708 /* This only works for newreno. */
19712 if (rack->rc_pacing_cc_set) {
19714 * Set them into the real CC module
19715 * whats in the rack pcb is the old values
19716 * to be used on restoral/
19718 sopt.sopt_dir = SOPT_SET;
19719 opt.name = CC_NEWRENO_BETA_ECN;
19721 if (CC_ALGO(tp)->ctl_output != NULL)
19722 error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, &sopt, &opt);
19727 * Not pacing yet so set it into our local
19728 * rack pcb storage.
19730 rack->r_ctl.rc_saved_beta.beta_ecn = optval;
19731 rack->r_ctl.rc_saved_beta.newreno_flags = CC_NEWRENO_BETA_ECN_ENABLED;
19734 case TCP_DEFER_OPTIONS:
19735 RACK_OPTS_INC(tcp_defer_opt);
19737 if (rack->gp_ready) {
19742 rack->defer_options = 1;
19744 rack->defer_options = 0;
19746 case TCP_RACK_MEASURE_CNT:
19747 RACK_OPTS_INC(tcp_rack_measure_cnt);
19748 if (optval && (optval <= 0xff)) {
19749 rack->r_ctl.req_measurements = optval;
19753 case TCP_REC_ABC_VAL:
19754 RACK_OPTS_INC(tcp_rec_abc_val);
19756 rack->r_use_labc_for_rec = 1;
19758 rack->r_use_labc_for_rec = 0;
19760 case TCP_RACK_ABC_VAL:
19761 RACK_OPTS_INC(tcp_rack_abc_val);
19762 if ((optval > 0) && (optval < 255))
19763 rack->rc_labc = optval;
19767 case TCP_HDWR_UP_ONLY:
19768 RACK_OPTS_INC(tcp_pacing_up_only);
19770 rack->r_up_only = 1;
19772 rack->r_up_only = 0;
19774 case TCP_PACING_RATE_CAP:
19775 RACK_OPTS_INC(tcp_pacing_rate_cap);
19776 rack->r_ctl.bw_rate_cap = loptval;
19778 case TCP_RACK_PROFILE:
19779 RACK_OPTS_INC(tcp_profile);
19780 error = rack_set_profile(rack, optval);
19782 case TCP_USE_CMP_ACKS:
19783 RACK_OPTS_INC(tcp_use_cmp_acks);
19784 if ((optval == 0) && (rack->rc_inp->inp_flags2 & INP_MBUF_ACKCMP)) {
19785 /* You can't turn it off once its on! */
19787 } else if ((optval == 1) && (rack->r_use_cmp_ack == 0)) {
19788 rack->r_use_cmp_ack = 1;
19789 rack->r_mbuf_queue = 1;
19790 inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
19792 if (rack->r_use_cmp_ack && TCPS_HAVEESTABLISHED(tp->t_state))
19793 inp->inp_flags2 |= INP_MBUF_ACKCMP;
19795 case TCP_SHARED_CWND_TIME_LIMIT:
19796 RACK_OPTS_INC(tcp_lscwnd);
19798 rack->r_limit_scw = 1;
19800 rack->r_limit_scw = 0;
19802 case TCP_RACK_PACE_TO_FILL:
19803 RACK_OPTS_INC(tcp_fillcw);
19805 rack->rc_pace_to_cwnd = 0;
19807 rack->rc_pace_to_cwnd = 1;
19809 rack->r_fill_less_agg = 1;
19811 if ((optval >= rack_gp_rtt_maxmul) &&
19812 rack_gp_rtt_maxmul &&
19814 rack->rc_pace_fill_if_rttin_range = 1;
19815 rack->rtt_limit_mul = optval;
19817 rack->rc_pace_fill_if_rttin_range = 0;
19818 rack->rtt_limit_mul = 0;
19821 case TCP_RACK_NO_PUSH_AT_MAX:
19822 RACK_OPTS_INC(tcp_npush);
19824 rack->r_ctl.rc_no_push_at_mrtt = 0;
19825 else if (optval < 0xff)
19826 rack->r_ctl.rc_no_push_at_mrtt = optval;
19830 case TCP_SHARED_CWND_ENABLE:
19831 RACK_OPTS_INC(tcp_rack_scwnd);
19833 rack->rack_enable_scwnd = 0;
19835 rack->rack_enable_scwnd = 1;
19837 case TCP_RACK_MBUF_QUEUE:
19838 /* Now do we use the LRO mbuf-queue feature */
19839 RACK_OPTS_INC(tcp_rack_mbufq);
19840 if (optval || rack->r_use_cmp_ack)
19841 rack->r_mbuf_queue = 1;
19843 rack->r_mbuf_queue = 0;
19844 if (rack->r_mbuf_queue || rack->rc_always_pace || rack->r_use_cmp_ack)
19845 inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
19847 inp->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
19849 case TCP_RACK_NONRXT_CFG_RATE:
19850 RACK_OPTS_INC(tcp_rack_cfg_rate);
19852 rack->rack_rec_nonrxt_use_cr = 0;
19854 rack->rack_rec_nonrxt_use_cr = 1;
19857 RACK_OPTS_INC(tcp_rack_noprr);
19859 rack->rack_no_prr = 0;
19860 else if (optval == 1)
19861 rack->rack_no_prr = 1;
19862 else if (optval == 2)
19863 rack->no_prr_addback = 1;
19867 case TCP_TIMELY_DYN_ADJ:
19868 RACK_OPTS_INC(tcp_timely_dyn);
19870 rack->rc_gp_dyn_mul = 0;
19872 rack->rc_gp_dyn_mul = 1;
19873 if (optval >= 100) {
19875 * If the user sets something 100 or more
19876 * its the gp_ca value.
19878 rack->r_ctl.rack_per_of_gp_ca = optval;
19882 case TCP_RACK_DO_DETECTION:
19883 RACK_OPTS_INC(tcp_rack_do_detection);
19885 rack->do_detection = 0;
19887 rack->do_detection = 1;
19889 case TCP_RACK_TLP_USE:
19890 if ((optval < TLP_USE_ID) || (optval > TLP_USE_TWO_TWO)) {
19894 RACK_OPTS_INC(tcp_tlp_use);
19895 rack->rack_tlp_threshold_use = optval;
19897 case TCP_RACK_TLP_REDUCE:
19898 /* RACK TLP cwnd reduction (bool) */
19899 RACK_OPTS_INC(tcp_rack_tlp_reduce);
19900 rack->r_ctl.rc_tlp_cwnd_reduce = optval;
19902 /* Pacing related ones */
19903 case TCP_RACK_PACE_ALWAYS:
19905 * zero is old rack method, 1 is new
19906 * method using a pacing rate.
19908 RACK_OPTS_INC(tcp_rack_pace_always);
19910 if (rack->rc_always_pace) {
19913 } else if (tcp_can_enable_pacing()) {
19914 rack->rc_always_pace = 1;
19915 if (rack->use_fixed_rate || rack->gp_ready)
19916 rack_set_cc_pacing(rack);
19923 if (rack->rc_always_pace) {
19924 tcp_decrement_paced_conn();
19925 rack->rc_always_pace = 0;
19926 rack_undo_cc_pacing(rack);
19929 if (rack->r_mbuf_queue || rack->rc_always_pace || rack->r_use_cmp_ack)
19930 inp->inp_flags2 |= INP_SUPPORTS_MBUFQ;
19932 inp->inp_flags2 &= ~INP_SUPPORTS_MBUFQ;
19933 /* A rate may be set irate or other, if so set seg size */
19934 rack_update_seg(rack);
19936 case TCP_BBR_RACK_INIT_RATE:
19937 RACK_OPTS_INC(tcp_initial_rate);
19939 /* Change from kbits per second to bytes per second */
19942 rack->r_ctl.init_rate = val;
19943 if (rack->rc_init_win != rack_default_init_window) {
19947 * Options don't always get applied
19948 * in the order you think. So in order
19949 * to assure we update a cwnd we need
19950 * to check and see if we are still
19951 * where we should raise the cwnd.
19953 win = rc_init_window(rack);
19954 if (SEQ_GT(tp->snd_max, tp->iss))
19955 snt = tp->snd_max - tp->iss;
19959 (tp->snd_cwnd < win))
19960 tp->snd_cwnd = win;
19962 if (rack->rc_always_pace)
19963 rack_update_seg(rack);
19965 case TCP_BBR_IWINTSO:
19966 RACK_OPTS_INC(tcp_initial_win);
19967 if (optval && (optval <= 0xff)) {
19970 rack->rc_init_win = optval;
19971 win = rc_init_window(rack);
19972 if (SEQ_GT(tp->snd_max, tp->iss))
19973 snt = tp->snd_max - tp->iss;
19978 #ifdef NETFLIX_PEAKRATE
19979 tp->t_maxpeakrate |
19981 rack->r_ctl.init_rate)) {
19983 * We are not past the initial window
19984 * and we have some bases for pacing,
19985 * so we need to possibly adjust up
19986 * the cwnd. Note even if we don't set
19987 * the cwnd, its still ok to raise the rc_init_win
19988 * which can be used coming out of idle when we
19989 * would have a rate.
19991 if (tp->snd_cwnd < win)
19992 tp->snd_cwnd = win;
19994 if (rack->rc_always_pace)
19995 rack_update_seg(rack);
19999 case TCP_RACK_FORCE_MSEG:
20000 RACK_OPTS_INC(tcp_rack_force_max_seg);
20002 rack->rc_force_max_seg = 1;
20004 rack->rc_force_max_seg = 0;
20006 case TCP_RACK_PACE_MAX_SEG:
20007 /* Max segments size in a pace in bytes */
20008 RACK_OPTS_INC(tcp_rack_max_seg);
20009 rack->rc_user_set_max_segs = optval;
20010 rack_set_pace_segments(tp, rack, __LINE__, NULL);
20012 case TCP_RACK_PACE_RATE_REC:
20013 /* Set the fixed pacing rate in Bytes per second ca */
20014 RACK_OPTS_INC(tcp_rack_pace_rate_rec);
20015 rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
20016 if (rack->r_ctl.rc_fixed_pacing_rate_ca == 0)
20017 rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
20018 if (rack->r_ctl.rc_fixed_pacing_rate_ss == 0)
20019 rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
20020 rack->use_fixed_rate = 1;
20021 if (rack->rc_always_pace)
20022 rack_set_cc_pacing(rack);
20023 rack_log_pacing_delay_calc(rack,
20024 rack->r_ctl.rc_fixed_pacing_rate_ss,
20025 rack->r_ctl.rc_fixed_pacing_rate_ca,
20026 rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
20030 case TCP_RACK_PACE_RATE_SS:
20031 /* Set the fixed pacing rate in Bytes per second ca */
20032 RACK_OPTS_INC(tcp_rack_pace_rate_ss);
20033 rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
20034 if (rack->r_ctl.rc_fixed_pacing_rate_ca == 0)
20035 rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
20036 if (rack->r_ctl.rc_fixed_pacing_rate_rec == 0)
20037 rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
20038 rack->use_fixed_rate = 1;
20039 if (rack->rc_always_pace)
20040 rack_set_cc_pacing(rack);
20041 rack_log_pacing_delay_calc(rack,
20042 rack->r_ctl.rc_fixed_pacing_rate_ss,
20043 rack->r_ctl.rc_fixed_pacing_rate_ca,
20044 rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
20045 __LINE__, NULL, 0);
20048 case TCP_RACK_PACE_RATE_CA:
20049 /* Set the fixed pacing rate in Bytes per second ca */
20050 RACK_OPTS_INC(tcp_rack_pace_rate_ca);
20051 rack->r_ctl.rc_fixed_pacing_rate_ca = optval;
20052 if (rack->r_ctl.rc_fixed_pacing_rate_ss == 0)
20053 rack->r_ctl.rc_fixed_pacing_rate_ss = optval;
20054 if (rack->r_ctl.rc_fixed_pacing_rate_rec == 0)
20055 rack->r_ctl.rc_fixed_pacing_rate_rec = optval;
20056 rack->use_fixed_rate = 1;
20057 if (rack->rc_always_pace)
20058 rack_set_cc_pacing(rack);
20059 rack_log_pacing_delay_calc(rack,
20060 rack->r_ctl.rc_fixed_pacing_rate_ss,
20061 rack->r_ctl.rc_fixed_pacing_rate_ca,
20062 rack->r_ctl.rc_fixed_pacing_rate_rec, 0, 0, 8,
20063 __LINE__, NULL, 0);
20065 case TCP_RACK_GP_INCREASE_REC:
20066 RACK_OPTS_INC(tcp_gp_inc_rec);
20067 rack->r_ctl.rack_per_of_gp_rec = optval;
20068 rack_log_pacing_delay_calc(rack,
20069 rack->r_ctl.rack_per_of_gp_ss,
20070 rack->r_ctl.rack_per_of_gp_ca,
20071 rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
20072 __LINE__, NULL, 0);
20074 case TCP_RACK_GP_INCREASE_CA:
20075 RACK_OPTS_INC(tcp_gp_inc_ca);
20079 * We don't allow any reduction
20085 rack->r_ctl.rack_per_of_gp_ca = ca;
20086 rack_log_pacing_delay_calc(rack,
20087 rack->r_ctl.rack_per_of_gp_ss,
20088 rack->r_ctl.rack_per_of_gp_ca,
20089 rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
20090 __LINE__, NULL, 0);
20092 case TCP_RACK_GP_INCREASE_SS:
20093 RACK_OPTS_INC(tcp_gp_inc_ss);
20097 * We don't allow any reduction
20103 rack->r_ctl.rack_per_of_gp_ss = ss;
20104 rack_log_pacing_delay_calc(rack,
20105 rack->r_ctl.rack_per_of_gp_ss,
20106 rack->r_ctl.rack_per_of_gp_ca,
20107 rack->r_ctl.rack_per_of_gp_rec, 0, 0, 1,
20108 __LINE__, NULL, 0);
20110 case TCP_RACK_RR_CONF:
20111 RACK_OPTS_INC(tcp_rack_rrr_no_conf_rate);
20112 if (optval && optval <= 3)
20113 rack->r_rr_config = optval;
20115 rack->r_rr_config = 0;
20117 case TCP_HDWR_RATE_CAP:
20118 RACK_OPTS_INC(tcp_hdwr_rate_cap);
20120 if (rack->r_rack_hw_rate_caps == 0)
20121 rack->r_rack_hw_rate_caps = 1;
20125 rack->r_rack_hw_rate_caps = 0;
20128 case TCP_BBR_HDWR_PACE:
20129 RACK_OPTS_INC(tcp_hdwr_pacing);
20131 if (rack->rack_hdrw_pacing == 0) {
20132 rack->rack_hdw_pace_ena = 1;
20133 rack->rack_attempt_hdwr_pace = 0;
20137 rack->rack_hdw_pace_ena = 0;
20139 if (rack->r_ctl.crte != NULL) {
20140 rack->rack_hdrw_pacing = 0;
20141 rack->rack_attempt_hdwr_pace = 0;
20142 tcp_rel_pacing_rate(rack->r_ctl.crte, tp);
20143 rack->r_ctl.crte = NULL;
20148 /* End Pacing related ones */
20149 case TCP_RACK_PRR_SENDALOT:
20150 /* Allow PRR to send more than one seg */
20151 RACK_OPTS_INC(tcp_rack_prr_sendalot);
20152 rack->r_ctl.rc_prr_sendalot = optval;
20154 case TCP_RACK_MIN_TO:
20155 /* Minimum time between rack t-o's in ms */
20156 RACK_OPTS_INC(tcp_rack_min_to);
20157 rack->r_ctl.rc_min_to = optval;
20159 case TCP_RACK_EARLY_SEG:
20160 /* If early recovery max segments */
20161 RACK_OPTS_INC(tcp_rack_early_seg);
20162 rack->r_ctl.rc_early_recovery_segs = optval;
20164 case TCP_RACK_ENABLE_HYSTART:
20167 tp->t_ccv.flags |= CCF_HYSTART_ALLOWED;
20168 if (rack_do_hystart > RACK_HYSTART_ON)
20169 tp->t_ccv.flags |= CCF_HYSTART_CAN_SH_CWND;
20170 if (rack_do_hystart > RACK_HYSTART_ON_W_SC)
20171 tp->t_ccv.flags |= CCF_HYSTART_CONS_SSTH;
20173 tp->t_ccv.flags &= ~(CCF_HYSTART_ALLOWED|CCF_HYSTART_CAN_SH_CWND|CCF_HYSTART_CONS_SSTH);
20177 case TCP_RACK_REORD_THRESH:
20178 /* RACK reorder threshold (shift amount) */
20179 RACK_OPTS_INC(tcp_rack_reord_thresh);
20180 if ((optval > 0) && (optval < 31))
20181 rack->r_ctl.rc_reorder_shift = optval;
20185 case TCP_RACK_REORD_FADE:
20186 /* Does reordering fade after ms time */
20187 RACK_OPTS_INC(tcp_rack_reord_fade);
20188 rack->r_ctl.rc_reorder_fade = optval;
20190 case TCP_RACK_TLP_THRESH:
20191 /* RACK TLP theshold i.e. srtt+(srtt/N) */
20192 RACK_OPTS_INC(tcp_rack_tlp_thresh);
20194 rack->r_ctl.rc_tlp_threshold = optval;
20198 case TCP_BBR_USE_RACK_RR:
20199 RACK_OPTS_INC(tcp_rack_rr);
20201 rack->use_rack_rr = 1;
20203 rack->use_rack_rr = 0;
20205 case TCP_FAST_RSM_HACK:
20206 RACK_OPTS_INC(tcp_rack_fastrsm_hack);
20208 rack->fast_rsm_hack = 1;
20210 rack->fast_rsm_hack = 0;
20212 case TCP_RACK_PKT_DELAY:
20213 /* RACK added ms i.e. rack-rtt + reord + N */
20214 RACK_OPTS_INC(tcp_rack_pkt_delay);
20215 rack->r_ctl.rc_pkt_delay = optval;
20218 RACK_OPTS_INC(tcp_rack_delayed_ack);
20220 tp->t_delayed_ack = 0;
20222 tp->t_delayed_ack = 1;
20223 if (tp->t_flags & TF_DELACK) {
20224 tp->t_flags &= ~TF_DELACK;
20225 tp->t_flags |= TF_ACKNOW;
20226 NET_EPOCH_ENTER(et);
20228 NET_EPOCH_EXIT(et);
20232 case TCP_BBR_RACK_RTT_USE:
20233 RACK_OPTS_INC(tcp_rack_rtt_use);
20234 if ((optval != USE_RTT_HIGH) &&
20235 (optval != USE_RTT_LOW) &&
20236 (optval != USE_RTT_AVG))
20239 rack->r_ctl.rc_rate_sample_method = optval;
20241 case TCP_DATA_AFTER_CLOSE:
20242 RACK_OPTS_INC(tcp_data_after_close);
20244 rack->rc_allow_data_af_clo = 1;
20246 rack->rc_allow_data_af_clo = 0;
20251 #ifdef NETFLIX_STATS
20252 tcp_log_socket_option(tp, sopt_name, optval, error);
20259 rack_apply_deferred_options(struct tcp_rack *rack)
20261 struct deferred_opt_list *dol, *sdol;
20264 TAILQ_FOREACH_SAFE(dol, &rack->r_ctl.opt_list, next, sdol) {
20265 TAILQ_REMOVE(&rack->r_ctl.opt_list, dol, next);
20266 /* Disadvantage of deferal is you loose the error return */
20267 s_optval = (uint32_t)dol->optval;
20268 (void)rack_process_option(rack->rc_tp, rack, dol->optname, s_optval, dol->optval);
20269 free(dol, M_TCPDO);
20274 rack_hw_tls_change(struct tcpcb *tp, int chg)
20277 * HW tls state has changed.. fix all
20280 struct tcp_rack *rack;
20281 struct rack_sendmap *rsm;
20283 rack = (struct tcp_rack *)tp->t_fb_ptr;
20284 RB_FOREACH(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) {
20291 rack->r_ctl.fsb.hw_tls = 1;
20293 rack->r_ctl.fsb.hw_tls = 0;
20297 rack_pru_options(struct tcpcb *tp, int flags)
20299 if (flags & PRUS_OOB)
20300 return (EOPNOTSUPP);
20304 static struct tcp_function_block __tcp_rack = {
20305 .tfb_tcp_block_name = __XSTRING(STACKNAME),
20306 .tfb_tcp_output = rack_output,
20307 .tfb_do_queued_segments = ctf_do_queued_segments,
20308 .tfb_do_segment_nounlock = rack_do_segment_nounlock,
20309 .tfb_tcp_do_segment = rack_do_segment,
20310 .tfb_tcp_ctloutput = rack_ctloutput,
20311 .tfb_tcp_fb_init = rack_init,
20312 .tfb_tcp_fb_fini = rack_fini,
20313 .tfb_tcp_timer_stop_all = rack_stopall,
20314 .tfb_tcp_timer_activate = rack_timer_activate,
20315 .tfb_tcp_timer_active = rack_timer_active,
20316 .tfb_tcp_timer_stop = rack_timer_stop,
20317 .tfb_tcp_rexmit_tmr = rack_remxt_tmr,
20318 .tfb_tcp_handoff_ok = rack_handoff_ok,
20319 .tfb_tcp_mtu_chg = rack_mtu_change,
20320 .tfb_pru_options = rack_pru_options,
20321 .tfb_hwtls_change = rack_hw_tls_change,
20322 .tfb_compute_pipe = rack_compute_pipe,
20323 .tfb_flags = TCP_FUNC_OUTPUT_CANDROP,
20327 * rack_ctloutput() must drop the inpcb lock before performing copyin on
20328 * socket option arguments. When it re-acquires the lock after the copy, it
20329 * has to revalidate that the connection is still valid for the socket
20333 rack_set_sockopt(struct inpcb *inp, struct sockopt *sopt)
20336 struct ip6_hdr *ip6;
20342 struct tcp_rack *rack;
20344 int32_t error = 0, optval;
20346 tp = intotcpcb(inp);
20347 rack = (struct tcp_rack *)tp->t_fb_ptr;
20348 if (rack == NULL) {
20353 ip6 = (struct ip6_hdr *)rack->r_ctl.fsb.tcp_ip_hdr;
20356 ip = (struct ip *)rack->r_ctl.fsb.tcp_ip_hdr;
20359 switch (sopt->sopt_level) {
20362 MPASS(inp->inp_vflag & INP_IPV6PROTO);
20363 switch (sopt->sopt_name) {
20364 case IPV6_USE_MIN_MTU:
20365 tcp6_use_min_mtu(tp);
20369 * The DSCP codepoint has changed, update the fsb.
20371 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
20372 (rack->rc_inp->inp_flow & IPV6_FLOWINFO_MASK);
20380 switch (sopt->sopt_name) {
20383 * The DSCP codepoint has changed, update the fsb.
20385 ip->ip_tos = rack->rc_inp->inp_ip_tos;
20389 * The TTL has changed, update the fsb.
20391 ip->ip_ttl = rack->rc_inp->inp_ip_ttl;
20399 switch (sopt->sopt_name) {
20400 case TCP_RACK_TLP_REDUCE: /* URL:tlp_reduce */
20401 /* Pacing related ones */
20402 case TCP_RACK_PACE_ALWAYS: /* URL:pace_always */
20403 case TCP_BBR_RACK_INIT_RATE: /* URL:irate */
20404 case TCP_BBR_IWINTSO: /* URL:tso_iwin */
20405 case TCP_RACK_PACE_MAX_SEG: /* URL:pace_max_seg */
20406 case TCP_RACK_FORCE_MSEG: /* URL:force_max_seg */
20407 case TCP_RACK_PACE_RATE_CA: /* URL:pr_ca */
20408 case TCP_RACK_PACE_RATE_SS: /* URL:pr_ss*/
20409 case TCP_RACK_PACE_RATE_REC: /* URL:pr_rec */
20410 case TCP_RACK_GP_INCREASE_CA: /* URL:gp_inc_ca */
20411 case TCP_RACK_GP_INCREASE_SS: /* URL:gp_inc_ss */
20412 case TCP_RACK_GP_INCREASE_REC: /* URL:gp_inc_rec */
20413 case TCP_RACK_RR_CONF: /* URL:rrr_conf */
20414 case TCP_BBR_HDWR_PACE: /* URL:hdwrpace */
20415 case TCP_HDWR_RATE_CAP: /* URL:hdwrcap boolean */
20416 case TCP_PACING_RATE_CAP: /* URL:cap -- used by side-channel */
20417 case TCP_HDWR_UP_ONLY: /* URL:uponly -- hardware pacing boolean */
20418 /* End pacing related */
20419 case TCP_FAST_RSM_HACK: /* URL:frsm_hack */
20420 case TCP_DELACK: /* URL:delack (in base TCP i.e. tcp_hints along with cc etc ) */
20421 case TCP_RACK_PRR_SENDALOT: /* URL:prr_sendalot */
20422 case TCP_RACK_MIN_TO: /* URL:min_to */
20423 case TCP_RACK_EARLY_SEG: /* URL:early_seg */
20424 case TCP_RACK_REORD_THRESH: /* URL:reord_thresh */
20425 case TCP_RACK_REORD_FADE: /* URL:reord_fade */
20426 case TCP_RACK_TLP_THRESH: /* URL:tlp_thresh */
20427 case TCP_RACK_PKT_DELAY: /* URL:pkt_delay */
20428 case TCP_RACK_TLP_USE: /* URL:tlp_use */
20429 case TCP_BBR_RACK_RTT_USE: /* URL:rttuse */
20430 case TCP_BBR_USE_RACK_RR: /* URL:rackrr */
20431 case TCP_RACK_DO_DETECTION: /* URL:detect */
20432 case TCP_NO_PRR: /* URL:noprr */
20433 case TCP_TIMELY_DYN_ADJ: /* URL:dynamic */
20434 case TCP_DATA_AFTER_CLOSE: /* no URL */
20435 case TCP_RACK_NONRXT_CFG_RATE: /* URL:nonrxtcr */
20436 case TCP_SHARED_CWND_ENABLE: /* URL:scwnd */
20437 case TCP_RACK_MBUF_QUEUE: /* URL:mqueue */
20438 case TCP_RACK_NO_PUSH_AT_MAX: /* URL:npush */
20439 case TCP_RACK_PACE_TO_FILL: /* URL:fillcw */
20440 case TCP_SHARED_CWND_TIME_LIMIT: /* URL:lscwnd */
20441 case TCP_RACK_PROFILE: /* URL:profile */
20442 case TCP_USE_CMP_ACKS: /* URL:cmpack */
20443 case TCP_RACK_ABC_VAL: /* URL:labc */
20444 case TCP_REC_ABC_VAL: /* URL:reclabc */
20445 case TCP_RACK_MEASURE_CNT: /* URL:measurecnt */
20446 case TCP_DEFER_OPTIONS: /* URL:defer */
20447 case TCP_RACK_DSACK_OPT: /* URL:dsack */
20448 case TCP_RACK_PACING_BETA: /* URL:pacing_beta */
20449 case TCP_RACK_PACING_BETA_ECN: /* URL:pacing_beta_ecn */
20450 case TCP_RACK_TIMER_SLOP: /* URL:timer_slop */
20451 case TCP_RACK_ENABLE_HYSTART: /* URL:hystart */
20454 /* Filter off all unknown options to the base stack */
20455 return (tcp_default_ctloutput(inp, sopt));
20459 if (sopt->sopt_name == TCP_PACING_RATE_CAP) {
20460 error = sooptcopyin(sopt, &loptval, sizeof(loptval), sizeof(loptval));
20462 * We truncate it down to 32 bits for the socket-option trace this
20463 * means rates > 34Gbps won't show right, but thats probably ok.
20465 optval = (uint32_t)loptval;
20467 error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval));
20468 /* Save it in 64 bit form too */
20474 if (inp->inp_flags & INP_DROPPED) {
20476 return (ECONNRESET);
20478 if (tp->t_fb != &__tcp_rack) {
20480 return (ENOPROTOOPT);
20482 if (rack->defer_options && (rack->gp_ready == 0) &&
20483 (sopt->sopt_name != TCP_DEFER_OPTIONS) &&
20484 (sopt->sopt_name != TCP_RACK_PACING_BETA) &&
20485 (sopt->sopt_name != TCP_RACK_PACING_BETA_ECN) &&
20486 (sopt->sopt_name != TCP_RACK_MEASURE_CNT)) {
20487 /* Options are beind deferred */
20488 if (rack_add_deferred_option(rack, sopt->sopt_name, loptval)) {
20492 /* No memory to defer, fail */
20497 error = rack_process_option(tp, rack, sopt->sopt_name, optval, loptval);
20503 rack_fill_info(struct tcpcb *tp, struct tcp_info *ti)
20506 INP_WLOCK_ASSERT(tptoinpcb(tp));
20507 bzero(ti, sizeof(*ti));
20509 ti->tcpi_state = tp->t_state;
20510 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
20511 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
20512 if (tp->t_flags & TF_SACK_PERMIT)
20513 ti->tcpi_options |= TCPI_OPT_SACK;
20514 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
20515 ti->tcpi_options |= TCPI_OPT_WSCALE;
20516 ti->tcpi_snd_wscale = tp->snd_scale;
20517 ti->tcpi_rcv_wscale = tp->rcv_scale;
20519 if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
20520 ti->tcpi_options |= TCPI_OPT_ECN;
20521 if (tp->t_flags & TF_FASTOPEN)
20522 ti->tcpi_options |= TCPI_OPT_TFO;
20523 /* still kept in ticks is t_rcvtime */
20524 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
20525 /* Since we hold everything in precise useconds this is easy */
20526 ti->tcpi_rtt = tp->t_srtt;
20527 ti->tcpi_rttvar = tp->t_rttvar;
20528 ti->tcpi_rto = tp->t_rxtcur;
20529 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
20530 ti->tcpi_snd_cwnd = tp->snd_cwnd;
20532 * FreeBSD-specific extension fields for tcp_info.
20534 ti->tcpi_rcv_space = tp->rcv_wnd;
20535 ti->tcpi_rcv_nxt = tp->rcv_nxt;
20536 ti->tcpi_snd_wnd = tp->snd_wnd;
20537 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */
20538 ti->tcpi_snd_nxt = tp->snd_nxt;
20539 ti->tcpi_snd_mss = tp->t_maxseg;
20540 ti->tcpi_rcv_mss = tp->t_maxseg;
20541 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
20542 ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
20543 ti->tcpi_snd_zerowin = tp->t_sndzerowin;
20544 #ifdef NETFLIX_STATS
20545 ti->tcpi_total_tlp = tp->t_sndtlppack;
20546 ti->tcpi_total_tlp_bytes = tp->t_sndtlpbyte;
20547 memcpy(&ti->tcpi_rxsyninfo, &tp->t_rxsyninfo, sizeof(struct tcpsyninfo));
20550 if (tp->t_flags & TF_TOE) {
20551 ti->tcpi_options |= TCPI_OPT_TOE;
20552 tcp_offload_tcp_info(tp, ti);
20558 rack_get_sockopt(struct inpcb *inp, struct sockopt *sopt)
20561 struct tcp_rack *rack;
20562 int32_t error, optval;
20563 uint64_t val, loptval;
20564 struct tcp_info ti;
20566 * Because all our options are either boolean or an int, we can just
20567 * pull everything into optval and then unlock and copy. If we ever
20568 * add a option that is not a int, then this will have quite an
20569 * impact to this routine.
20572 tp = intotcpcb(inp);
20573 rack = (struct tcp_rack *)tp->t_fb_ptr;
20574 if (rack == NULL) {
20578 switch (sopt->sopt_name) {
20580 /* First get the info filled */
20581 rack_fill_info(tp, &ti);
20582 /* Fix up the rtt related fields if needed */
20584 error = sooptcopyout(sopt, &ti, sizeof ti);
20587 * Beta is the congestion control value for NewReno that influences how
20588 * much of a backoff happens when loss is detected. It is normally set
20589 * to 50 for 50% i.e. the cwnd is reduced to 50% of its previous value
20590 * when you exit recovery.
20592 case TCP_RACK_PACING_BETA:
20593 if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0)
20595 else if (rack->rc_pacing_cc_set == 0)
20596 optval = rack->r_ctl.rc_saved_beta.beta;
20599 * Reach out into the CC data and report back what
20600 * I have previously set. Yeah it looks hackish but
20601 * we don't want to report the saved values.
20603 if (tp->t_ccv.cc_data)
20604 optval = ((struct newreno *)tp->t_ccv.cc_data)->beta;
20610 * Beta_ecn is the congestion control value for NewReno that influences how
20611 * much of a backoff happens when a ECN mark is detected. It is normally set
20612 * to 80 for 80% i.e. the cwnd is reduced by 20% of its previous value when
20613 * you exit recovery. Note that classic ECN has a beta of 50, it is only
20614 * ABE Ecn that uses this "less" value, but we do too with pacing :)
20617 case TCP_RACK_PACING_BETA_ECN:
20618 if (strcmp(tp->t_cc->name, CCALGONAME_NEWRENO) != 0)
20620 else if (rack->rc_pacing_cc_set == 0)
20621 optval = rack->r_ctl.rc_saved_beta.beta_ecn;
20624 * Reach out into the CC data and report back what
20625 * I have previously set. Yeah it looks hackish but
20626 * we don't want to report the saved values.
20628 if (tp->t_ccv.cc_data)
20629 optval = ((struct newreno *)tp->t_ccv.cc_data)->beta_ecn;
20634 case TCP_RACK_DSACK_OPT:
20636 if (rack->rc_rack_tmr_std_based) {
20639 if (rack->rc_rack_use_dsack) {
20643 case TCP_RACK_ENABLE_HYSTART:
20645 if (tp->t_ccv.flags & CCF_HYSTART_ALLOWED) {
20646 optval = RACK_HYSTART_ON;
20647 if (tp->t_ccv.flags & CCF_HYSTART_CAN_SH_CWND)
20648 optval = RACK_HYSTART_ON_W_SC;
20649 if (tp->t_ccv.flags & CCF_HYSTART_CONS_SSTH)
20650 optval = RACK_HYSTART_ON_W_SC_C;
20652 optval = RACK_HYSTART_OFF;
20656 case TCP_FAST_RSM_HACK:
20657 optval = rack->fast_rsm_hack;
20659 case TCP_DEFER_OPTIONS:
20660 optval = rack->defer_options;
20662 case TCP_RACK_MEASURE_CNT:
20663 optval = rack->r_ctl.req_measurements;
20665 case TCP_REC_ABC_VAL:
20666 optval = rack->r_use_labc_for_rec;
20668 case TCP_RACK_ABC_VAL:
20669 optval = rack->rc_labc;
20671 case TCP_HDWR_UP_ONLY:
20672 optval= rack->r_up_only;
20674 case TCP_PACING_RATE_CAP:
20675 loptval = rack->r_ctl.bw_rate_cap;
20677 case TCP_RACK_PROFILE:
20678 /* You cannot retrieve a profile, its write only */
20681 case TCP_USE_CMP_ACKS:
20682 optval = rack->r_use_cmp_ack;
20684 case TCP_RACK_PACE_TO_FILL:
20685 optval = rack->rc_pace_to_cwnd;
20686 if (optval && rack->r_fill_less_agg)
20689 case TCP_RACK_NO_PUSH_AT_MAX:
20690 optval = rack->r_ctl.rc_no_push_at_mrtt;
20692 case TCP_SHARED_CWND_ENABLE:
20693 optval = rack->rack_enable_scwnd;
20695 case TCP_RACK_NONRXT_CFG_RATE:
20696 optval = rack->rack_rec_nonrxt_use_cr;
20699 if (rack->rack_no_prr == 1)
20701 else if (rack->no_prr_addback == 1)
20706 case TCP_RACK_DO_DETECTION:
20707 optval = rack->do_detection;
20709 case TCP_RACK_MBUF_QUEUE:
20710 /* Now do we use the LRO mbuf-queue feature */
20711 optval = rack->r_mbuf_queue;
20713 case TCP_TIMELY_DYN_ADJ:
20714 optval = rack->rc_gp_dyn_mul;
20716 case TCP_BBR_IWINTSO:
20717 optval = rack->rc_init_win;
20719 case TCP_RACK_TLP_REDUCE:
20720 /* RACK TLP cwnd reduction (bool) */
20721 optval = rack->r_ctl.rc_tlp_cwnd_reduce;
20723 case TCP_BBR_RACK_INIT_RATE:
20724 val = rack->r_ctl.init_rate;
20725 /* convert to kbits per sec */
20728 optval = (uint32_t)val;
20730 case TCP_RACK_FORCE_MSEG:
20731 optval = rack->rc_force_max_seg;
20733 case TCP_RACK_PACE_MAX_SEG:
20734 /* Max segments in a pace */
20735 optval = rack->rc_user_set_max_segs;
20737 case TCP_RACK_PACE_ALWAYS:
20738 /* Use the always pace method */
20739 optval = rack->rc_always_pace;
20741 case TCP_RACK_PRR_SENDALOT:
20742 /* Allow PRR to send more than one seg */
20743 optval = rack->r_ctl.rc_prr_sendalot;
20745 case TCP_RACK_MIN_TO:
20746 /* Minimum time between rack t-o's in ms */
20747 optval = rack->r_ctl.rc_min_to;
20749 case TCP_RACK_EARLY_SEG:
20750 /* If early recovery max segments */
20751 optval = rack->r_ctl.rc_early_recovery_segs;
20753 case TCP_RACK_REORD_THRESH:
20754 /* RACK reorder threshold (shift amount) */
20755 optval = rack->r_ctl.rc_reorder_shift;
20757 case TCP_RACK_REORD_FADE:
20758 /* Does reordering fade after ms time */
20759 optval = rack->r_ctl.rc_reorder_fade;
20761 case TCP_BBR_USE_RACK_RR:
20762 /* Do we use the rack cheat for rxt */
20763 optval = rack->use_rack_rr;
20765 case TCP_RACK_RR_CONF:
20766 optval = rack->r_rr_config;
20768 case TCP_HDWR_RATE_CAP:
20769 optval = rack->r_rack_hw_rate_caps;
20771 case TCP_BBR_HDWR_PACE:
20772 optval = rack->rack_hdw_pace_ena;
20774 case TCP_RACK_TLP_THRESH:
20775 /* RACK TLP theshold i.e. srtt+(srtt/N) */
20776 optval = rack->r_ctl.rc_tlp_threshold;
20778 case TCP_RACK_PKT_DELAY:
20779 /* RACK added ms i.e. rack-rtt + reord + N */
20780 optval = rack->r_ctl.rc_pkt_delay;
20782 case TCP_RACK_TLP_USE:
20783 optval = rack->rack_tlp_threshold_use;
20785 case TCP_RACK_PACE_RATE_CA:
20786 optval = rack->r_ctl.rc_fixed_pacing_rate_ca;
20788 case TCP_RACK_PACE_RATE_SS:
20789 optval = rack->r_ctl.rc_fixed_pacing_rate_ss;
20791 case TCP_RACK_PACE_RATE_REC:
20792 optval = rack->r_ctl.rc_fixed_pacing_rate_rec;
20794 case TCP_RACK_GP_INCREASE_SS:
20795 optval = rack->r_ctl.rack_per_of_gp_ca;
20797 case TCP_RACK_GP_INCREASE_CA:
20798 optval = rack->r_ctl.rack_per_of_gp_ss;
20800 case TCP_BBR_RACK_RTT_USE:
20801 optval = rack->r_ctl.rc_rate_sample_method;
20804 optval = tp->t_delayed_ack;
20806 case TCP_DATA_AFTER_CLOSE:
20807 optval = rack->rc_allow_data_af_clo;
20809 case TCP_SHARED_CWND_TIME_LIMIT:
20810 optval = rack->r_limit_scw;
20812 case TCP_RACK_TIMER_SLOP:
20813 optval = rack->r_ctl.timer_slop;
20816 return (tcp_default_ctloutput(inp, sopt));
20821 if (TCP_PACING_RATE_CAP)
20822 error = sooptcopyout(sopt, &loptval, sizeof loptval);
20824 error = sooptcopyout(sopt, &optval, sizeof optval);
20830 rack_ctloutput(struct inpcb *inp, struct sockopt *sopt)
20832 if (sopt->sopt_dir == SOPT_SET) {
20833 return (rack_set_sockopt(inp, sopt));
20834 } else if (sopt->sopt_dir == SOPT_GET) {
20835 return (rack_get_sockopt(inp, sopt));
20837 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
20841 static const char *rack_stack_names[] = {
20842 __XSTRING(STACKNAME),
20844 __XSTRING(STACKALIAS),
20849 rack_ctor(void *mem, int32_t size, void *arg, int32_t how)
20851 memset(mem, 0, size);
20856 rack_dtor(void *mem, int32_t size, void *arg)
20861 static bool rack_mod_inited = false;
20864 tcp_addrack(module_t mod, int32_t type, void *data)
20871 rack_zone = uma_zcreate(__XSTRING(MODNAME) "_map",
20872 sizeof(struct rack_sendmap),
20873 rack_ctor, rack_dtor, NULL, NULL, UMA_ALIGN_PTR, 0);
20875 rack_pcb_zone = uma_zcreate(__XSTRING(MODNAME) "_pcb",
20876 sizeof(struct tcp_rack),
20877 rack_ctor, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0);
20879 sysctl_ctx_init(&rack_sysctl_ctx);
20880 rack_sysctl_root = SYSCTL_ADD_NODE(&rack_sysctl_ctx,
20881 SYSCTL_STATIC_CHILDREN(_net_inet_tcp),
20884 __XSTRING(STACKALIAS),
20886 __XSTRING(STACKNAME),
20888 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
20890 if (rack_sysctl_root == NULL) {
20891 printf("Failed to add sysctl node\n");
20895 rack_init_sysctls();
20896 num_stacks = nitems(rack_stack_names);
20897 err = register_tcp_functions_as_names(&__tcp_rack, M_WAITOK,
20898 rack_stack_names, &num_stacks);
20900 printf("Failed to register %s stack name for "
20901 "%s module\n", rack_stack_names[num_stacks],
20902 __XSTRING(MODNAME));
20903 sysctl_ctx_free(&rack_sysctl_ctx);
20905 uma_zdestroy(rack_zone);
20906 uma_zdestroy(rack_pcb_zone);
20907 rack_counter_destroy();
20908 printf("Failed to register rack module -- err:%d\n", err);
20911 tcp_lro_reg_mbufq();
20912 rack_mod_inited = true;
20915 err = deregister_tcp_functions(&__tcp_rack, true, false);
20918 err = deregister_tcp_functions(&__tcp_rack, false, true);
20921 if (rack_mod_inited) {
20922 uma_zdestroy(rack_zone);
20923 uma_zdestroy(rack_pcb_zone);
20924 sysctl_ctx_free(&rack_sysctl_ctx);
20925 rack_counter_destroy();
20926 rack_mod_inited = false;
20928 tcp_lro_dereg_mbufq();
20932 return (EOPNOTSUPP);
20937 static moduledata_t tcp_rack = {
20938 .name = __XSTRING(MODNAME),
20939 .evhand = tcp_addrack,
20943 MODULE_VERSION(MODNAME, 1);
20944 DECLARE_MODULE(MODNAME, tcp_rack, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
20945 MODULE_DEPEND(MODNAME, tcphpts, 1, 1, 1);