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Merge ^/head r319973 through 321382.
[FreeBSD/FreeBSD.git] / sys / dev / cxgbe / tom / t4_connect.c
1 /*-
2  * Copyright (c) 2012 Chelsio Communications, Inc.
3  * All rights reserved.
4  * Written by: Navdeep Parhar <np@FreeBSD.org>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include "opt_inet.h"
32 #include "opt_inet6.h"
33
34 #ifdef TCP_OFFLOAD
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/ktr.h>
39 #include <sys/module.h>
40 #include <sys/protosw.h>
41 #include <sys/domain.h>
42 #include <sys/socket.h>
43 #include <sys/socketvar.h>
44 #include <net/ethernet.h>
45 #include <net/if.h>
46 #include <net/if_types.h>
47 #include <net/if_vlan_var.h>
48 #include <net/route.h>
49 #include <netinet/in.h>
50 #include <netinet/in_pcb.h>
51 #include <netinet/ip.h>
52 #define TCPSTATES
53 #include <netinet/tcp_fsm.h>
54 #include <netinet/tcp_var.h>
55 #include <netinet/toecore.h>
56
57 #include "common/common.h"
58 #include "common/t4_msg.h"
59 #include "common/t4_regs.h"
60 #include "common/t4_regs_values.h"
61 #include "tom/t4_tom_l2t.h"
62 #include "tom/t4_tom.h"
63
64 /* atid services */
65 static int alloc_atid(struct adapter *, void *);
66 static void *lookup_atid(struct adapter *, int);
67 static void free_atid(struct adapter *, int);
68
69 static int
70 alloc_atid(struct adapter *sc, void *ctx)
71 {
72         struct tid_info *t = &sc->tids;
73         int atid = -1;
74
75         mtx_lock(&t->atid_lock);
76         if (t->afree) {
77                 union aopen_entry *p = t->afree;
78
79                 atid = p - t->atid_tab;
80                 t->afree = p->next;
81                 p->data = ctx;
82                 t->atids_in_use++;
83         }
84         mtx_unlock(&t->atid_lock);
85         return (atid);
86 }
87
88 static void *
89 lookup_atid(struct adapter *sc, int atid)
90 {
91         struct tid_info *t = &sc->tids;
92
93         return (t->atid_tab[atid].data);
94 }
95
96 static void
97 free_atid(struct adapter *sc, int atid)
98 {
99         struct tid_info *t = &sc->tids;
100         union aopen_entry *p = &t->atid_tab[atid];
101
102         mtx_lock(&t->atid_lock);
103         p->next = t->afree;
104         t->afree = p;
105         t->atids_in_use--;
106         mtx_unlock(&t->atid_lock);
107 }
108
109 /*
110  * Active open succeeded.
111  */
112 static int
113 do_act_establish(struct sge_iq *iq, const struct rss_header *rss,
114     struct mbuf *m)
115 {
116         struct adapter *sc = iq->adapter;
117         const struct cpl_act_establish *cpl = (const void *)(rss + 1);
118         u_int tid = GET_TID(cpl);
119         u_int atid = G_TID_TID(ntohl(cpl->tos_atid));
120         struct toepcb *toep = lookup_atid(sc, atid);
121         struct inpcb *inp = toep->inp;
122
123         KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
124         KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
125
126         CTR3(KTR_CXGBE, "%s: atid %u, tid %u", __func__, atid, tid);
127         free_atid(sc, atid);
128
129         CURVNET_SET(toep->vnet);
130         INP_WLOCK(inp);
131         toep->tid = tid;
132         insert_tid(sc, tid, toep, inp->inp_vflag & INP_IPV6 ? 2 : 1);
133         if (inp->inp_flags & INP_DROPPED) {
134
135                 /* socket closed by the kernel before hw told us it connected */
136
137                 send_flowc_wr(toep, NULL);
138                 send_reset(sc, toep, be32toh(cpl->snd_isn));
139                 goto done;
140         }
141
142         make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt);
143 done:
144         INP_WUNLOCK(inp);
145         CURVNET_RESTORE();
146         return (0);
147 }
148
149 /*
150  * Convert an ACT_OPEN_RPL status to an errno.
151  */
152 static inline int
153 act_open_rpl_status_to_errno(int status)
154 {
155
156         switch (status) {
157         case CPL_ERR_CONN_RESET:
158                 return (ECONNREFUSED);
159         case CPL_ERR_ARP_MISS:
160                 return (EHOSTUNREACH);
161         case CPL_ERR_CONN_TIMEDOUT:
162                 return (ETIMEDOUT);
163         case CPL_ERR_TCAM_FULL:
164                 return (EAGAIN);
165         case CPL_ERR_CONN_EXIST:
166                 log(LOG_ERR, "ACTIVE_OPEN_RPL: 4-tuple in use\n");
167                 return (EAGAIN);
168         default:
169                 return (EIO);
170         }
171 }
172
173 void
174 act_open_failure_cleanup(struct adapter *sc, u_int atid, u_int status)
175 {
176         struct toepcb *toep = lookup_atid(sc, atid);
177         struct inpcb *inp = toep->inp;
178         struct toedev *tod = &toep->td->tod;
179
180         free_atid(sc, atid);
181         toep->tid = -1;
182
183         CURVNET_SET(toep->vnet);
184         if (status != EAGAIN)
185                 INP_INFO_RLOCK(&V_tcbinfo);
186         INP_WLOCK(inp);
187         toe_connect_failed(tod, inp, status);
188         final_cpl_received(toep);       /* unlocks inp */
189         if (status != EAGAIN)
190                 INP_INFO_RUNLOCK(&V_tcbinfo);
191         CURVNET_RESTORE();
192 }
193
194 /*
195  * Active open failed.
196  */
197 static int
198 do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss,
199     struct mbuf *m)
200 {
201         struct adapter *sc = iq->adapter;
202         const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1);
203         u_int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status)));
204         u_int status = G_AOPEN_STATUS(be32toh(cpl->atid_status));
205         struct toepcb *toep = lookup_atid(sc, atid);
206         int rc;
207
208         KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
209         KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
210
211         CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status);
212
213         /* Ignore negative advice */
214         if (negative_advice(status))
215                 return (0);
216
217         if (status && act_open_has_tid(status))
218                 release_tid(sc, GET_TID(cpl), toep->ctrlq);
219
220         rc = act_open_rpl_status_to_errno(status);
221         act_open_failure_cleanup(sc, atid, rc);
222
223         return (0);
224 }
225
226 /*
227  * Options2 for active open.
228  */
229 static uint32_t
230 calc_opt2a(struct socket *so, struct toepcb *toep)
231 {
232         struct tcpcb *tp = so_sototcpcb(so);
233         struct port_info *pi = toep->vi->pi;
234         struct adapter *sc = pi->adapter;
235         uint32_t opt2;
236
237         opt2 = V_TX_QUEUE(sc->params.tp.tx_modq[pi->tx_chan]) |
238             F_RSS_QUEUE_VALID | V_RSS_QUEUE(toep->ofld_rxq->iq.abs_id);
239
240         if (tp->t_flags & TF_SACK_PERMIT)
241                 opt2 |= F_SACK_EN;
242
243         if (tp->t_flags & TF_REQ_TSTMP)
244                 opt2 |= F_TSTAMPS_EN;
245
246         if (tp->t_flags & TF_REQ_SCALE)
247                 opt2 |= F_WND_SCALE_EN;
248
249         if (V_tcp_do_ecn)
250                 opt2 |= F_CCTRL_ECN;
251
252         /* RX_COALESCE is always a valid value (M_RX_COALESCE). */
253         if (is_t4(sc))
254                 opt2 |= F_RX_COALESCE_VALID;
255         else {
256                 opt2 |= F_T5_OPT_2_VALID;
257                 opt2 |= F_T5_ISS;
258         }
259         if (sc->tt.rx_coalesce)
260                 opt2 |= V_RX_COALESCE(M_RX_COALESCE);
261
262 #ifdef USE_DDP_RX_FLOW_CONTROL
263         if (toep->ulp_mode == ULP_MODE_TCPDDP)
264                 opt2 |= F_RX_FC_VALID | F_RX_FC_DDP;
265 #endif
266
267         return (htobe32(opt2));
268 }
269
270 void
271 t4_init_connect_cpl_handlers(void)
272 {
273
274         t4_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
275         t4_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
276 }
277
278 void
279 t4_uninit_connect_cpl_handlers(void)
280 {
281
282         t4_register_cpl_handler(CPL_ACT_ESTABLISH, NULL);
283         t4_register_cpl_handler(CPL_ACT_OPEN_RPL, NULL);
284 }
285
286 #define DONT_OFFLOAD_ACTIVE_OPEN(x)     do { \
287         reason = __LINE__; \
288         rc = (x); \
289         goto failed; \
290 } while (0)
291
292 static inline int
293 act_open_cpl_size(struct adapter *sc, int isipv6)
294 {
295         int idx;
296         static const int sz_table[3][2] = {
297                 {
298                         sizeof (struct cpl_act_open_req),
299                         sizeof (struct cpl_act_open_req6)
300                 },
301                 {
302                         sizeof (struct cpl_t5_act_open_req),
303                         sizeof (struct cpl_t5_act_open_req6)
304                 },
305                 {
306                         sizeof (struct cpl_t6_act_open_req),
307                         sizeof (struct cpl_t6_act_open_req6)
308                 },
309         };
310
311         MPASS(chip_id(sc) >= CHELSIO_T4);
312         idx = min(chip_id(sc) - CHELSIO_T4, 2);
313
314         return (sz_table[idx][!!isipv6]);
315 }
316
317 /*
318  * active open (soconnect).
319  *
320  * State of affairs on entry:
321  * soisconnecting (so_state |= SS_ISCONNECTING)
322  * tcbinfo not locked (This has changed - used to be WLOCKed)
323  * inp WLOCKed
324  * tp->t_state = TCPS_SYN_SENT
325  * rtalloc1, RT_UNLOCK on rt.
326  */
327 int
328 t4_connect(struct toedev *tod, struct socket *so, struct rtentry *rt,
329     struct sockaddr *nam)
330 {
331         struct adapter *sc = tod->tod_softc;
332         struct tom_data *td = tod_td(tod);
333         struct toepcb *toep = NULL;
334         struct wrqe *wr = NULL;
335         struct ifnet *rt_ifp = rt->rt_ifp;
336         struct vi_info *vi;
337         int mtu_idx, rscale, qid_atid, rc, isipv6;
338         struct inpcb *inp = sotoinpcb(so);
339         struct tcpcb *tp = intotcpcb(inp);
340         int reason;
341
342         INP_WLOCK_ASSERT(inp);
343         KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
344             ("%s: dest addr %p has family %u", __func__, nam, nam->sa_family));
345
346         if (rt_ifp->if_type == IFT_ETHER)
347                 vi = rt_ifp->if_softc;
348         else if (rt_ifp->if_type == IFT_L2VLAN) {
349                 struct ifnet *ifp = VLAN_COOKIE(rt_ifp);
350
351                 vi = ifp->if_softc;
352         } else if (rt_ifp->if_type == IFT_IEEE8023ADLAG)
353                 DONT_OFFLOAD_ACTIVE_OPEN(ENOSYS); /* XXX: implement lagg+TOE */
354         else
355                 DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
356
357         toep = alloc_toepcb(vi, -1, -1, M_NOWAIT | M_ZERO);
358         if (toep == NULL)
359                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
360
361         toep->tid = alloc_atid(sc, toep);
362         if (toep->tid < 0)
363                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
364
365         toep->l2te = t4_l2t_get(vi->pi, rt_ifp,
366             rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway : nam);
367         if (toep->l2te == NULL)
368                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
369
370         isipv6 = nam->sa_family == AF_INET6;
371         wr = alloc_wrqe(act_open_cpl_size(sc, isipv6), toep->ctrlq);
372         if (wr == NULL)
373                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
374
375         toep->vnet = so->so_vnet;
376         if (sc->tt.ddp && (so->so_options & SO_NO_DDP) == 0)
377                 set_tcpddp_ulp_mode(toep);
378         else
379                 toep->ulp_mode = ULP_MODE_NONE;
380         SOCKBUF_LOCK(&so->so_rcv);
381         /* opt0 rcv_bufsiz initially, assumes its normal meaning later */
382         toep->rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ);
383         SOCKBUF_UNLOCK(&so->so_rcv);
384
385         /*
386          * The kernel sets request_r_scale based on sb_max whereas we need to
387          * take hardware's MAX_RCV_WND into account too.  This is normally a
388          * no-op as MAX_RCV_WND is much larger than the default sb_max.
389          */
390         if (tp->t_flags & TF_REQ_SCALE)
391                 rscale = tp->request_r_scale = select_rcv_wscale();
392         else
393                 rscale = 0;
394         mtu_idx = find_best_mtu_idx(sc, &inp->inp_inc, 0);
395         qid_atid = (toep->ofld_rxq->iq.abs_id << 14) | toep->tid;
396
397         if (isipv6) {
398                 struct cpl_act_open_req6 *cpl = wrtod(wr);
399                 struct cpl_t5_act_open_req6 *cpl5 = (void *)cpl;
400                 struct cpl_t6_act_open_req6 *cpl6 = (void *)cpl;
401
402                 if ((inp->inp_vflag & INP_IPV6) == 0)
403                         DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
404
405                 toep->ce = hold_lip(td, &inp->in6p_laddr, NULL);
406                 if (toep->ce == NULL)
407                         DONT_OFFLOAD_ACTIVE_OPEN(ENOENT);
408
409                 switch (chip_id(sc)) {
410                 case CHELSIO_T4:
411                         INIT_TP_WR(cpl, 0);
412                         cpl->params = select_ntuple(vi, toep->l2te);
413                         break;
414                 case CHELSIO_T5:
415                         INIT_TP_WR(cpl5, 0);
416                         cpl5->iss = htobe32(tp->iss);
417                         cpl5->params = select_ntuple(vi, toep->l2te);
418                         break;
419                 case CHELSIO_T6:
420                 default:
421                         INIT_TP_WR(cpl6, 0);
422                         cpl6->iss = htobe32(tp->iss);
423                         cpl6->params = select_ntuple(vi, toep->l2te);
424                         break;
425                 }
426                 OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
427                     qid_atid));
428                 cpl->local_port = inp->inp_lport;
429                 cpl->local_ip_hi = *(uint64_t *)&inp->in6p_laddr.s6_addr[0];
430                 cpl->local_ip_lo = *(uint64_t *)&inp->in6p_laddr.s6_addr[8];
431                 cpl->peer_port = inp->inp_fport;
432                 cpl->peer_ip_hi = *(uint64_t *)&inp->in6p_faddr.s6_addr[0];
433                 cpl->peer_ip_lo = *(uint64_t *)&inp->in6p_faddr.s6_addr[8];
434                 cpl->opt0 = calc_opt0(so, vi, toep->l2te, mtu_idx, rscale,
435                     toep->rx_credits, toep->ulp_mode);
436                 cpl->opt2 = calc_opt2a(so, toep);
437         } else {
438                 struct cpl_act_open_req *cpl = wrtod(wr);
439                 struct cpl_t5_act_open_req *cpl5 = (void *)cpl;
440                 struct cpl_t6_act_open_req *cpl6 = (void *)cpl;
441
442                 switch (chip_id(sc)) {
443                 case CHELSIO_T4:
444                         INIT_TP_WR(cpl, 0);
445                         cpl->params = select_ntuple(vi, toep->l2te);
446                         break;
447                 case CHELSIO_T5:
448                         INIT_TP_WR(cpl5, 0);
449                         cpl5->iss = htobe32(tp->iss);
450                         cpl5->params = select_ntuple(vi, toep->l2te);
451                         break;
452                 case CHELSIO_T6:
453                 default:
454                         INIT_TP_WR(cpl6, 0);
455                         cpl6->iss = htobe32(tp->iss);
456                         cpl6->params = select_ntuple(vi, toep->l2te);
457                         break;
458                 }
459                 OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
460                     qid_atid));
461                 inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port,
462                     &cpl->peer_ip, &cpl->peer_port);
463                 cpl->opt0 = calc_opt0(so, vi, toep->l2te, mtu_idx, rscale,
464                     toep->rx_credits, toep->ulp_mode);
465                 cpl->opt2 = calc_opt2a(so, toep);
466         }
467
468         CTR5(KTR_CXGBE, "%s: atid %u (%s), toep %p, inp %p", __func__,
469             toep->tid, tcpstates[tp->t_state], toep, inp);
470
471         offload_socket(so, toep);
472         rc = t4_l2t_send(sc, wr, toep->l2te);
473         if (rc == 0) {
474                 toep->flags |= TPF_CPL_PENDING;
475                 return (0);
476         }
477
478         undo_offload_socket(so);
479         reason = __LINE__;
480 failed:
481         CTR3(KTR_CXGBE, "%s: not offloading (%d), rc %d", __func__, reason, rc);
482
483         if (wr)
484                 free_wrqe(wr);
485
486         if (toep) {
487                 if (toep->tid >= 0)
488                         free_atid(sc, toep->tid);
489                 if (toep->l2te)
490                         t4_l2t_release(toep->l2te);
491                 if (toep->ce)
492                         release_lip(td, toep->ce);
493                 free_toepcb(toep);
494         }
495
496         return (rc);
497 }
498 #endif