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32 * Author: Randall Stewart <rrs@netflix.com>
34 #ifndef __tcp_ratelimit_h__
35 #define __tcp_ratelimit_h__
39 #define RL_MIN_DIVISOR 50
40 #define RL_DEFAULT_DIVISOR 1000
42 /* Flags on an individual rate */
43 #define HDWRPACE_INITED 0x0001
44 #define HDWRPACE_TAGPRESENT 0x0002
45 #define HDWRPACE_IFPDEPARTED 0x0004
46 struct tcp_hwrate_limit_table {
47 const struct tcp_rate_set *ptbl; /* Pointer to parent table */
48 struct m_snd_tag *tag; /* Send tag if needed (chelsio) */
49 long rate; /* Rate we get in Bytes per second (Bps) */
50 long using; /* How many flows are using this hdwr rate. */
52 uint32_t time_between; /* Time-Gap between packets at this rate */
57 #define RS_IS_DEFF 0x0001 /* Its a lagg, do a double lookup */
58 #define RS_IS_INTF 0x0002 /* Its a plain interface */
59 #define RS_NO_PRE 0x0004 /* The interfacd has set rates */
60 #define RS_INT_TBL 0x0010 /*
61 * The table is the internal version
62 * which has special setup requirements.
64 #define RS_IS_DEAD 0x0020 /* The RS is dead list */
65 #define RS_FUNERAL_SCHD 0x0040 /* Is a epoch call scheduled to bury this guy?*/
66 #define RS_INTF_NO_SUP 0x0100 /* The interface does not support the ratelimiting */
69 struct sysctl_ctx_list sysctl_ctx;
70 CK_LIST_ENTRY(tcp_rate_set) next;
72 struct tcp_hwrate_limit_table *rs_rlt;
73 uint64_t rs_flows_using;
74 uint64_t rs_flow_limit;
82 struct epoch_context rs_epoch_ctx;
85 CK_LIST_HEAD(head_tcp_rate_set, tcp_rate_set);
88 #define RS_PACING_EXACT_MATCH 0x0001 /* Need an exact match for rate */
89 #define RS_PACING_GT 0x0002 /* Greater than requested */
90 #define RS_PACING_GEQ 0x0004 /* Greater than or equal too */
91 #define RS_PACING_LT 0x0008 /* Less than requested rate */
92 #define RS_PACING_SUB_OK 0x0010 /* If a rate can't be found get the
93 * next best rate (highest or lowest). */
95 #ifndef ETHERNET_SEGMENT_SIZE
96 #define ETHERNET_SEGMENT_SIZE 1514
99 #define DETAILED_RATELIMIT_SYSCTL 1 /*
100 * Undefine this if you don't want
101 * detailed rates to appear in
103 * With the defintion each rate
104 * shows up in your sysctl tree
108 tcp_hw_highest_rate(const struct tcp_hwrate_limit_table *rle)
110 return (rle->ptbl->rs_rlt[rle->ptbl->rs_highest_valid].rate);
114 tcp_hw_highest_rate_ifp(struct ifnet *ifp, struct inpcb *inp);
116 const struct tcp_hwrate_limit_table *
117 tcp_set_pacing_rate(struct tcpcb *tp, struct ifnet *ifp,
118 uint64_t bytes_per_sec, int flags, int *error, uint64_t *lower_rate);
120 const struct tcp_hwrate_limit_table *
121 tcp_chg_pacing_rate(const struct tcp_hwrate_limit_table *crte,
122 struct tcpcb *tp, struct ifnet *ifp,
123 uint64_t bytes_per_sec, int flags, int *error, uint64_t *lower_rate);
125 tcp_rel_pacing_rate(const struct tcp_hwrate_limit_table *crte,
129 tcp_get_pacing_burst_size_w_divisor(struct tcpcb *tp, uint64_t bw, uint32_t segsiz, int can_use_1mss,
130 const struct tcp_hwrate_limit_table *te, int *err, int divisor);
133 tcp_rl_log_enobuf(const struct tcp_hwrate_limit_table *rte);
136 static inline const struct tcp_hwrate_limit_table *
137 tcp_set_pacing_rate(struct tcpcb *tp, struct ifnet *ifp,
138 uint64_t bytes_per_sec, int flags, int *error, uint64_t *lower_rate)
145 static inline const struct tcp_hwrate_limit_table *
146 tcp_chg_pacing_rate(const struct tcp_hwrate_limit_table *crte,
147 struct tcpcb *tp, struct ifnet *ifp,
148 uint64_t bytes_per_sec, int flags, int *error, uint64_t *lower_rate)
156 tcp_rel_pacing_rate(const struct tcp_hwrate_limit_table *crte,
162 static uint64_t inline
163 tcp_hw_highest_rate(const struct tcp_hwrate_limit_table *rle)
168 static uint64_t inline
169 tcp_hw_highest_rate_ifp(struct ifnet *ifp, struct inpcb *inp)
174 static inline uint32_t
175 tcp_get_pacing_burst_size_w_divisor(struct tcpcb *tp, uint64_t bw, uint32_t segsiz, int can_use_1mss,
176 const struct tcp_hwrate_limit_table *te, int *err, int divisor)
179 * We use the google formula to calculate the
184 * tso = min(bw/(div=1000), 64k)
186 * Note for these calculations we ignore the
187 * packet overhead (enet hdr, ip hdr and tcp hdr).
188 * We only get the google formula when we have
189 * divisor = 1000, which is the default for now.
192 uint32_t new_tso, min_tso_segs;
194 /* It can't be zero */
195 if ((divisor == 0) ||
196 (divisor < RL_MIN_DIVISOR)) {
197 bytes = bw / RL_DEFAULT_DIVISOR;
199 bytes = bw / divisor;
200 /* We can't ever send more than 65k in a TSO */
201 if (bytes > 0xffff) {
205 new_tso = (bytes + segsiz - 1) / segsiz;
210 if (new_tso < min_tso_segs)
211 new_tso = min_tso_segs;
216 /* Do nothing if RATELIMIT is not defined */
218 tcp_rl_log_enobuf(const struct tcp_hwrate_limit_table *rte)
225 * Given a b/w and a segsiz, and optional hardware
226 * rate limit, return the ideal size to burst
227 * out at once. Note the parameter can_use_1mss
228 * dictates if the transport will tolerate a 1mss
229 * limit, if not it will bottom out at 2mss (think
232 static inline uint32_t
233 tcp_get_pacing_burst_size(struct tcpcb *tp, uint64_t bw, uint32_t segsiz, int can_use_1mss,
234 const struct tcp_hwrate_limit_table *te, int *err)
237 return (tcp_get_pacing_burst_size_w_divisor(tp, bw, segsiz,