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 "tom/t4_tom_l2t.h" 61 #include "tom/t4_tom.h" 62 63 /* atid services */ 64 static int alloc_atid(struct adapter *, void *); 65 static void *lookup_atid(struct adapter *, int); 66 static void free_atid(struct adapter *, int); 67 68 static int 69 alloc_atid(struct adapter *sc, void *ctx) 70 { 71 struct tid_info *t = &sc->tids; 72 int atid = -1; 73 74 mtx_lock(&t->atid_lock); 75 if (t->afree) { 76 union aopen_entry *p = t->afree; 77 78 atid = p - t->atid_tab; 79 t->afree = p->next; 80 p->data = ctx; 81 t->atids_in_use++; 82 } 83 mtx_unlock(&t->atid_lock); 84 return (atid); 85 } 86 87 static void * 88 lookup_atid(struct adapter *sc, int atid) 89 { 90 struct tid_info *t = &sc->tids; 91 92 return (t->atid_tab[atid].data); 93 } 94 95 static void 96 free_atid(struct adapter *sc, int atid) 97 { 98 struct tid_info *t = &sc->tids; 99 union aopen_entry *p = &t->atid_tab[atid]; 100 101 mtx_lock(&t->atid_lock); 102 p->next = t->afree; 103 t->afree = p; 104 t->atids_in_use--; 105 mtx_unlock(&t->atid_lock); 106 } 107 108 /* 109 * Active open failed. 110 */ 111 static int 112 do_act_establish(struct sge_iq *iq, const struct rss_header *rss, 113 struct mbuf *m) 114 { 115 struct adapter *sc = iq->adapter; 116 const struct cpl_act_establish *cpl = (const void *)(rss + 1); 117 unsigned int tid = GET_TID(cpl); 118 unsigned int atid = G_TID_TID(ntohl(cpl->tos_atid)); 119 struct toepcb *toep = lookup_atid(sc, atid); 120 struct inpcb *inp = toep->inp; 121 122 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 123 KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__)); 124 125 CTR3(KTR_CXGBE, "%s: atid %u, tid %u", __func__, atid, tid); 126 free_atid(sc, atid); 127 128 INP_WLOCK(inp); 129 toep->tid = tid; 130 insert_tid(sc, tid, toep); 131 if (inp->inp_flags & INP_DROPPED) { 132 133 /* socket closed by the kernel before hw told us it connected */ 134 135 send_flowc_wr(toep, NULL); 136 send_reset(sc, toep, be32toh(cpl->snd_isn)); 137 goto done; 138 } 139 140 make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt); 141 done: 142 INP_WUNLOCK(inp); 143 return (0); 144 } 145 146 static inline int 147 act_open_has_tid(unsigned int status) 148 { 149 150 return (status != CPL_ERR_TCAM_FULL && 151 status != CPL_ERR_TCAM_PARITY && 152 status != CPL_ERR_CONN_EXIST && 153 status != CPL_ERR_ARP_MISS); 154 } 155 156 /* 157 * Convert an ACT_OPEN_RPL status to an errno. 158 */ 159 static inline int 160 act_open_rpl_status_to_errno(int status) 161 { 162 163 switch (status) { 164 case CPL_ERR_CONN_RESET: 165 return (ECONNREFUSED); 166 case CPL_ERR_ARP_MISS: 167 return (EHOSTUNREACH); 168 case CPL_ERR_CONN_TIMEDOUT: 169 return (ETIMEDOUT); 170 case CPL_ERR_TCAM_FULL: 171 return (EAGAIN); 172 case CPL_ERR_CONN_EXIST: 173 log(LOG_ERR, "ACTIVE_OPEN_RPL: 4-tuple in use\n"); 174 return (EAGAIN); 175 default: 176 return (EIO); 177 } 178 } 179 180 static int 181 do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss, 182 struct mbuf *m) 183 { 184 struct adapter *sc = iq->adapter; 185 const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1); 186 unsigned int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status))); 187 unsigned int status = G_AOPEN_STATUS(be32toh(cpl->atid_status)); 188 struct toepcb *toep = lookup_atid(sc, atid); 189 struct inpcb *inp = toep->inp; 190 struct toedev *tod = &toep->td->tod; 191 int rc; 192 193 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 194 KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__)); 195 196 CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status); 197 198 /* Ignore negative advice */ 199 if (negative_advice(status)) 200 return (0); 201 202 free_atid(sc, atid); 203 toep->tid = -1; 204 205 if (status && act_open_has_tid(status)) 206 release_tid(sc, GET_TID(cpl), toep->ctrlq); 207 208 rc = act_open_rpl_status_to_errno(status); 209 if (rc != EAGAIN) 210 INP_INFO_WLOCK(&V_tcbinfo); 211 INP_WLOCK(inp); 212 toe_connect_failed(tod, inp, rc); 213 final_cpl_received(toep); /* unlocks inp */ 214 if (rc != EAGAIN) 215 INP_INFO_WUNLOCK(&V_tcbinfo); 216 217 return (0); 218 } 219 220 /* 221 * Options2 for active open. 222 */ 223 static uint32_t 224 calc_opt2a(struct socket *so, struct toepcb *toep) 225 { 226 struct tcpcb *tp = so_sototcpcb(so); 227 struct port_info *pi = toep->port; 228 struct adapter *sc = pi->adapter; 229 uint32_t opt2 = 0; 230 231 if (tp->t_flags & TF_SACK_PERMIT) 232 opt2 |= F_SACK_EN; 233 234 if (tp->t_flags & TF_REQ_TSTMP) 235 opt2 |= F_TSTAMPS_EN; 236 237 if (tp->t_flags & TF_REQ_SCALE) 238 opt2 |= F_WND_SCALE_EN; 239 240 if (V_tcp_do_ecn) 241 opt2 |= F_CCTRL_ECN; 242 243 opt2 |= V_TX_QUEUE(sc->params.tp.tx_modq[pi->tx_chan]); 244 opt2 |= F_RX_COALESCE_VALID | V_RX_COALESCE(M_RX_COALESCE); 245 opt2 |= F_RSS_QUEUE_VALID | V_RSS_QUEUE(toep->ofld_rxq->iq.abs_id); 246 247 #ifdef USE_DDP_RX_FLOW_CONTROL 248 if (toep->ulp_mode == ULP_MODE_TCPDDP) 249 opt2 |= F_RX_FC_VALID | F_RX_FC_DDP; 250 #endif 251 252 return (htobe32(opt2)); 253 } 254 255 void 256 t4_init_connect_cpl_handlers(struct adapter *sc) 257 { 258 259 t4_register_cpl_handler(sc, CPL_ACT_ESTABLISH, do_act_establish); 260 t4_register_cpl_handler(sc, CPL_ACT_OPEN_RPL, do_act_open_rpl); 261 } 262 263 #define DONT_OFFLOAD_ACTIVE_OPEN(x) do { \ 264 reason = __LINE__; \ 265 rc = (x); \ 266 goto failed; \ 267 } while (0) 268 269 /* 270 * active open (soconnect). 271 * 272 * State of affairs on entry: 273 * soisconnecting (so_state |= SS_ISCONNECTING) 274 * tcbinfo not locked (This has changed - used to be WLOCKed) 275 * inp WLOCKed 276 * tp->t_state = TCPS_SYN_SENT 277 * rtalloc1, RT_UNLOCK on rt. 278 */ 279 int 280 t4_connect(struct toedev *tod, struct socket *so, struct rtentry *rt, 281 struct sockaddr *nam) 282 { 283 struct adapter *sc = tod->tod_softc; 284 struct tom_data *td = tod_td(tod); 285 struct toepcb *toep = NULL; 286 struct wrqe *wr = NULL; 287 struct ifnet *rt_ifp = rt->rt_ifp; 288 struct port_info *pi; 289 int mtu_idx, rscale, qid_atid, rc, isipv6; 290 struct inpcb *inp = sotoinpcb(so); 291 struct tcpcb *tp = intotcpcb(inp); 292 int reason; 293 294 INP_WLOCK_ASSERT(inp); 295 KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6, 296 ("%s: dest addr %p has family %u", __func__, nam, nam->sa_family)); 297 298 if (rt_ifp->if_type == IFT_ETHER) 299 pi = rt_ifp->if_softc; 300 else if (rt_ifp->if_type == IFT_L2VLAN) { 301 struct ifnet *ifp = VLAN_COOKIE(rt_ifp); 302 303 pi = ifp->if_softc; 304 } else if (rt_ifp->if_type == IFT_IEEE8023ADLAG) 305 DONT_OFFLOAD_ACTIVE_OPEN(ENOSYS); /* XXX: implement lagg+TOE */ 306 else 307 DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP); 308 309 toep = alloc_toepcb(pi, -1, -1, M_NOWAIT); 310 if (toep == NULL) 311 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM); 312 313 toep->tid = alloc_atid(sc, toep); 314 if (toep->tid < 0) 315 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM); 316 317 toep->l2te = t4_l2t_get(pi, rt_ifp, 318 rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway : nam); 319 if (toep->l2te == NULL) 320 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM); 321 322 isipv6 = nam->sa_family == AF_INET6; 323 wr = alloc_wrqe(isipv6 ? sizeof(struct cpl_act_open_req6) : 324 sizeof(struct cpl_act_open_req), toep->ctrlq); 325 if (wr == NULL) 326 DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM); 327 328 if (sc->tt.ddp && (so->so_options & SO_NO_DDP) == 0) 329 set_tcpddp_ulp_mode(toep); 330 else 331 toep->ulp_mode = ULP_MODE_NONE; 332 SOCKBUF_LOCK(&so->so_rcv); 333 /* opt0 rcv_bufsiz initially, assumes its normal meaning later */ 334 toep->rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ); 335 SOCKBUF_UNLOCK(&so->so_rcv); 336 337 /* 338 * The kernel sets request_r_scale based on sb_max whereas we need to 339 * take hardware's MAX_RCV_WND into account too. This is normally a 340 * no-op as MAX_RCV_WND is much larger than the default sb_max. 341 */ 342 if (tp->t_flags & TF_REQ_SCALE) 343 rscale = tp->request_r_scale = select_rcv_wscale(); 344 else 345 rscale = 0; 346 mtu_idx = find_best_mtu_idx(sc, &inp->inp_inc, 0); 347 qid_atid = (toep->ofld_rxq->iq.abs_id << 14) | toep->tid; 348 349 if (isipv6) { 350 struct cpl_act_open_req6 *cpl = wrtod(wr); 351 352 if ((inp->inp_vflag & INP_IPV6) == 0) { 353 /* XXX think about this a bit more */ 354 log(LOG_ERR, 355 "%s: time to think about AF_INET6 + vflag 0x%x.\n", 356 __func__, inp->inp_vflag); 357 DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP); 358 } 359 360 toep->ce = hold_lip(td, &inp->in6p_laddr); 361 if (toep->ce == NULL) 362 DONT_OFFLOAD_ACTIVE_OPEN(ENOENT); 363 364 INIT_TP_WR(cpl, 0); 365 OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6, 366 qid_atid)); 367 368 cpl->local_port = inp->inp_lport; 369 cpl->local_ip_hi = *(uint64_t *)&inp->in6p_laddr.s6_addr[0]; 370 cpl->local_ip_lo = *(uint64_t *)&inp->in6p_laddr.s6_addr[8]; 371 cpl->peer_port = inp->inp_fport; 372 cpl->peer_ip_hi = *(uint64_t *)&inp->in6p_faddr.s6_addr[0]; 373 cpl->peer_ip_lo = *(uint64_t *)&inp->in6p_faddr.s6_addr[8]; 374 cpl->opt0 = calc_opt0(so, pi, toep->l2te, mtu_idx, rscale, 375 toep->rx_credits, toep->ulp_mode); 376 cpl->params = select_ntuple(pi, toep->l2te, sc->filter_mode); 377 cpl->opt2 = calc_opt2a(so, toep); 378 } else { 379 struct cpl_act_open_req *cpl = wrtod(wr); 380 381 INIT_TP_WR(cpl, 0); 382 OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, 383 qid_atid)); 384 inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port, 385 &cpl->peer_ip, &cpl->peer_port); 386 cpl->opt0 = calc_opt0(so, pi, toep->l2te, mtu_idx, rscale, 387 toep->rx_credits, toep->ulp_mode); 388 cpl->params = select_ntuple(pi, toep->l2te, sc->filter_mode); 389 cpl->opt2 = calc_opt2a(so, toep); 390 } 391 392 CTR5(KTR_CXGBE, "%s: atid %u (%s), toep %p, inp %p", __func__, 393 toep->tid, tcpstates[tp->t_state], toep, inp); 394 395 offload_socket(so, toep); 396 rc = t4_l2t_send(sc, wr, toep->l2te); 397 if (rc == 0) { 398 toep->flags |= TPF_CPL_PENDING; 399 return (0); 400 } 401 402 undo_offload_socket(so); 403 reason = __LINE__; 404 failed: 405 CTR3(KTR_CXGBE, "%s: not offloading (%d), rc %d", __func__, reason, rc); 406 407 if (wr) 408 free_wrqe(wr); 409 410 if (toep) { 411 if (toep->tid >= 0) 412 free_atid(sc, toep->tid); 413 if (toep->l2te) 414 t4_l2t_release(toep->l2te); 415 if (toep->ce) 416 release_lip(td, toep->ce); 417 free_toepcb(toep); 418 } 419 420 return (rc); 421 } 422 #endif 423