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[FreeBSD/stable/10.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/types.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 #include <netinet/tcp_var.h>
53 #define TCPSTATES
54 #include <netinet/tcp_fsm.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 failed.
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         INP_WLOCK(inp);
130         toep->tid = tid;
131         insert_tid(sc, tid, toep);
132         if (inp->inp_flags & INP_DROPPED) {
133
134                 /* socket closed by the kernel before hw told us it connected */
135
136                 send_flowc_wr(toep, NULL);
137                 send_reset(sc, toep, be32toh(cpl->snd_isn));
138                 goto done;
139         }
140
141         make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt);
142 done:
143         INP_WUNLOCK(inp);
144         return (0);
145 }
146
147 /*
148  * Convert an ACT_OPEN_RPL status to an errno.
149  */
150 static inline int
151 act_open_rpl_status_to_errno(int status)
152 {
153
154         switch (status) {
155         case CPL_ERR_CONN_RESET:
156                 return (ECONNREFUSED);
157         case CPL_ERR_ARP_MISS:
158                 return (EHOSTUNREACH);
159         case CPL_ERR_CONN_TIMEDOUT:
160                 return (ETIMEDOUT);
161         case CPL_ERR_TCAM_FULL:
162                 return (EAGAIN);
163         case CPL_ERR_CONN_EXIST:
164                 log(LOG_ERR, "ACTIVE_OPEN_RPL: 4-tuple in use\n");
165                 return (EAGAIN);
166         default:
167                 return (EIO);
168         }
169 }
170
171 void
172 act_open_failure_cleanup(struct adapter *sc, u_int atid, u_int status)
173 {
174         struct toepcb *toep = lookup_atid(sc, atid);
175         struct inpcb *inp = toep->inp;
176         struct toedev *tod = &toep->td->tod;
177
178         free_atid(sc, atid);
179         toep->tid = -1;
180
181         if (status != EAGAIN)
182                 INP_INFO_WLOCK(&V_tcbinfo);
183         INP_WLOCK(inp);
184         toe_connect_failed(tod, inp, status);
185         final_cpl_received(toep);       /* unlocks inp */
186         if (status != EAGAIN)
187                 INP_INFO_WUNLOCK(&V_tcbinfo);
188 }
189
190 static int
191 do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss,
192     struct mbuf *m)
193 {
194         struct adapter *sc = iq->adapter;
195         const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1);
196         u_int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status)));
197         u_int status = G_AOPEN_STATUS(be32toh(cpl->atid_status));
198         struct toepcb *toep = lookup_atid(sc, atid);
199         int rc;
200
201         KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
202         KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
203
204         CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status);
205
206         /* Ignore negative advice */
207         if (negative_advice(status))
208                 return (0);
209
210         if (status && act_open_has_tid(status))
211                 release_tid(sc, GET_TID(cpl), toep->ctrlq);
212
213         rc = act_open_rpl_status_to_errno(status);
214         act_open_failure_cleanup(sc, atid, rc);
215
216         return (0);
217 }
218
219 /*
220  * Options2 for active open.
221  */
222 static uint32_t
223 calc_opt2a(struct socket *so, struct toepcb *toep)
224 {
225         struct tcpcb *tp = so_sototcpcb(so);
226         struct port_info *pi = toep->vi->pi;
227         struct adapter *sc = pi->adapter;
228         uint32_t opt2;
229
230         opt2 = V_TX_QUEUE(sc->params.tp.tx_modq[pi->tx_chan]) |
231             F_RSS_QUEUE_VALID | V_RSS_QUEUE(toep->ofld_rxq->iq.abs_id);
232
233         if (tp->t_flags & TF_SACK_PERMIT)
234                 opt2 |= F_SACK_EN;
235
236         if (tp->t_flags & TF_REQ_TSTMP)
237                 opt2 |= F_TSTAMPS_EN;
238
239         if (tp->t_flags & TF_REQ_SCALE)
240                 opt2 |= F_WND_SCALE_EN;
241
242         if (V_tcp_do_ecn)
243                 opt2 |= F_CCTRL_ECN;
244
245         /* RX_COALESCE is always a valid value (M_RX_COALESCE). */
246         if (is_t4(sc))
247                 opt2 |= F_RX_COALESCE_VALID;
248         else {
249                 opt2 |= F_T5_OPT_2_VALID;
250                 opt2 |= F_T5_ISS;
251         }
252         if (sc->tt.rx_coalesce)
253                 opt2 |= V_RX_COALESCE(M_RX_COALESCE);
254
255 #ifdef USE_DDP_RX_FLOW_CONTROL
256         if (toep->ulp_mode == ULP_MODE_TCPDDP)
257                 opt2 |= F_RX_FC_VALID | F_RX_FC_DDP;
258 #endif
259
260         return (htobe32(opt2));
261 }
262
263 void
264 t4_init_connect_cpl_handlers(struct adapter *sc)
265 {
266
267         t4_register_cpl_handler(sc, CPL_ACT_ESTABLISH, do_act_establish);
268         t4_register_cpl_handler(sc, CPL_ACT_OPEN_RPL, do_act_open_rpl);
269 }
270
271 #define DONT_OFFLOAD_ACTIVE_OPEN(x)     do { \
272         reason = __LINE__; \
273         rc = (x); \
274         goto failed; \
275 } while (0)
276
277 static inline int
278 act_open_cpl_size(struct adapter *sc, int isipv6)
279 {
280         static const int sz_t4[] = {
281                 sizeof (struct cpl_act_open_req),
282                 sizeof (struct cpl_act_open_req6)
283         };
284         static const int sz_t5[] = {
285                 sizeof (struct cpl_t5_act_open_req),
286                 sizeof (struct cpl_t5_act_open_req6)
287         };
288
289         if (is_t4(sc))
290                 return (sz_t4[!!isipv6]);
291         else
292                 return (sz_t5[!!isipv6]);
293 }
294
295 /*
296  * active open (soconnect).
297  *
298  * State of affairs on entry:
299  * soisconnecting (so_state |= SS_ISCONNECTING)
300  * tcbinfo not locked (This has changed - used to be WLOCKed)
301  * inp WLOCKed
302  * tp->t_state = TCPS_SYN_SENT
303  * rtalloc1, RT_UNLOCK on rt.
304  */
305 int
306 t4_connect(struct toedev *tod, struct socket *so, struct rtentry *rt,
307     struct sockaddr *nam)
308 {
309         struct adapter *sc = tod->tod_softc;
310         struct tom_data *td = tod_td(tod);
311         struct toepcb *toep = NULL;
312         struct wrqe *wr = NULL;
313         struct ifnet *rt_ifp = rt->rt_ifp;
314         struct vi_info *vi;
315         int mtu_idx, rscale, qid_atid, rc, isipv6;
316         struct inpcb *inp = sotoinpcb(so);
317         struct tcpcb *tp = intotcpcb(inp);
318         int reason;
319
320         INP_WLOCK_ASSERT(inp);
321         KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
322             ("%s: dest addr %p has family %u", __func__, nam, nam->sa_family));
323
324         if (rt_ifp->if_type == IFT_ETHER)
325                 vi = rt_ifp->if_softc;
326         else if (rt_ifp->if_type == IFT_L2VLAN) {
327                 struct ifnet *ifp = VLAN_COOKIE(rt_ifp);
328
329                 vi = ifp->if_softc;
330         } else if (rt_ifp->if_type == IFT_IEEE8023ADLAG)
331                 DONT_OFFLOAD_ACTIVE_OPEN(ENOSYS); /* XXX: implement lagg+TOE */
332         else
333                 DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
334
335         toep = alloc_toepcb(vi, -1, -1, M_NOWAIT);
336         if (toep == NULL)
337                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
338
339         toep->tid = alloc_atid(sc, toep);
340         if (toep->tid < 0)
341                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
342
343         toep->l2te = t4_l2t_get(vi->pi, rt_ifp,
344             rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway : nam);
345         if (toep->l2te == NULL)
346                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
347
348         isipv6 = nam->sa_family == AF_INET6;
349         wr = alloc_wrqe(act_open_cpl_size(sc, isipv6), toep->ctrlq);
350         if (wr == NULL)
351                 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
352
353         if (sc->tt.ddp && (so->so_options & SO_NO_DDP) == 0)
354                 set_tcpddp_ulp_mode(toep);
355         else
356                 toep->ulp_mode = ULP_MODE_NONE;
357         SOCKBUF_LOCK(&so->so_rcv);
358         /* opt0 rcv_bufsiz initially, assumes its normal meaning later */
359         toep->rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ);
360         SOCKBUF_UNLOCK(&so->so_rcv);
361
362         /*
363          * The kernel sets request_r_scale based on sb_max whereas we need to
364          * take hardware's MAX_RCV_WND into account too.  This is normally a
365          * no-op as MAX_RCV_WND is much larger than the default sb_max.
366          */
367         if (tp->t_flags & TF_REQ_SCALE)
368                 rscale = tp->request_r_scale = select_rcv_wscale();
369         else
370                 rscale = 0;
371         mtu_idx = find_best_mtu_idx(sc, &inp->inp_inc, 0);
372         qid_atid = (toep->ofld_rxq->iq.abs_id << 14) | toep->tid;
373
374         if (isipv6) {
375                 struct cpl_act_open_req6 *cpl = wrtod(wr);
376
377                 if ((inp->inp_vflag & INP_IPV6) == 0) {
378                         /* XXX think about this a bit more */
379                         log(LOG_ERR,
380                             "%s: time to think about AF_INET6 + vflag 0x%x.\n",
381                             __func__, inp->inp_vflag);
382                         DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
383                 }
384
385                 toep->ce = hold_lip(td, &inp->in6p_laddr);
386                 if (toep->ce == NULL)
387                         DONT_OFFLOAD_ACTIVE_OPEN(ENOENT);
388
389                 if (is_t4(sc)) {
390                         INIT_TP_WR(cpl, 0);
391                         cpl->params = select_ntuple(vi, toep->l2te);
392                 } else {
393                         struct cpl_t5_act_open_req6 *c5 = (void *)cpl;
394
395                         INIT_TP_WR(c5, 0);
396                         c5->iss = htobe32(tp->iss);
397                         c5->params = select_ntuple(vi, toep->l2te);
398                 }
399                 OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
400                     qid_atid));
401                 cpl->local_port = inp->inp_lport;
402                 cpl->local_ip_hi = *(uint64_t *)&inp->in6p_laddr.s6_addr[0];
403                 cpl->local_ip_lo = *(uint64_t *)&inp->in6p_laddr.s6_addr[8];
404                 cpl->peer_port = inp->inp_fport;
405                 cpl->peer_ip_hi = *(uint64_t *)&inp->in6p_faddr.s6_addr[0];
406                 cpl->peer_ip_lo = *(uint64_t *)&inp->in6p_faddr.s6_addr[8];
407                 cpl->opt0 = calc_opt0(so, vi, toep->l2te, mtu_idx, rscale,
408                     toep->rx_credits, toep->ulp_mode);
409                 cpl->opt2 = calc_opt2a(so, toep);
410         } else {
411                 struct cpl_act_open_req *cpl = wrtod(wr);
412
413                 if (is_t4(sc)) {
414                         INIT_TP_WR(cpl, 0);
415                         cpl->params = select_ntuple(vi, toep->l2te);
416                 } else {
417                         struct cpl_t5_act_open_req *c5 = (void *)cpl;
418
419                         INIT_TP_WR(c5, 0);
420                         c5->iss = htobe32(tp->iss);
421                         c5->params = select_ntuple(vi, toep->l2te);
422                 }
423                 OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
424                     qid_atid));
425                 inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port,
426                     &cpl->peer_ip, &cpl->peer_port);
427                 cpl->opt0 = calc_opt0(so, vi, toep->l2te, mtu_idx, rscale,
428                     toep->rx_credits, toep->ulp_mode);
429                 cpl->opt2 = calc_opt2a(so, toep);
430         }
431
432         CTR5(KTR_CXGBE, "%s: atid %u (%s), toep %p, inp %p", __func__,
433             toep->tid, tcpstates[tp->t_state], toep, inp);
434
435         offload_socket(so, toep);
436         rc = t4_l2t_send(sc, wr, toep->l2te);
437         if (rc == 0) {
438                 toep->flags |= TPF_CPL_PENDING;
439                 return (0);
440         }
441
442         undo_offload_socket(so);
443         reason = __LINE__;
444 failed:
445         CTR3(KTR_CXGBE, "%s: not offloading (%d), rc %d", __func__, reason, rc);
446
447         if (wr)
448                 free_wrqe(wr);
449
450         if (toep) {
451                 if (toep->tid >= 0)
452                         free_atid(sc, toep->tid);
453                 if (toep->l2te)
454                         t4_l2t_release(toep->l2te);
455                 if (toep->ce)
456                         release_lip(td, toep->ce);
457                 free_toepcb(toep);
458         }
459
460         return (rc);
461 }
462 #endif