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 33 #ifdef TCP_OFFLOAD 34 #include <sys/param.h> 35 #include <sys/types.h> 36 #include <sys/kernel.h> 37 #include <sys/ktr.h> 38 #include <sys/module.h> 39 #include <sys/protosw.h> 40 #include <sys/domain.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <net/ethernet.h> 44 #include <net/if.h> 45 #include <net/if_types.h> 46 #include <net/if_vlan_var.h> 47 #include <net/route.h> 48 #include <netinet/in.h> 49 #include <netinet/in_pcb.h> 50 #include <netinet/ip.h> 51 #include <netinet/tcp_var.h> 52 #define TCPSTATES 53 #include <netinet/tcp_fsm.h> 54 #include <netinet/toecore.h> 55 56 #include "common/common.h" 57 #include "common/t4_msg.h" 58 #include "common/t4_regs.h" 59 #include "tom/t4_tom_l2t.h" 60 #include "tom/t4_tom.h" 61 62 /* atid services */ 63 static int alloc_atid(struct adapter *, void *); 64 static void *lookup_atid(struct adapter *, int); 65 static void free_atid(struct adapter *, int); 66 67 static int 68 alloc_atid(struct adapter *sc, void *ctx) 69 { 70 struct tid_info *t = &sc->tids; 71 int atid = -1; 72 73 mtx_lock(&t->atid_lock); 74 if (t->afree) { 75 union aopen_entry *p = t->afree; 76 77 atid = p - t->atid_tab; 78 t->afree = p->next; 79 p->data = ctx; 80 t->atids_in_use++; 81 } 82 mtx_unlock(&t->atid_lock); 83 return (atid); 84 } 85 86 static void * 87 lookup_atid(struct adapter *sc, int atid) 88 { 89 struct tid_info *t = &sc->tids; 90 91 return (t->atid_tab[atid].data); 92 } 93 94 static void 95 free_atid(struct adapter *sc, int atid) 96 { 97 struct tid_info *t = &sc->tids; 98 union aopen_entry *p = &t->atid_tab[atid]; 99 100 mtx_lock(&t->atid_lock); 101 p->next = t->afree; 102 t->afree = p; 103 t->atids_in_use--; 104 mtx_unlock(&t->atid_lock); 105 } 106 107 /* 108 * Active open failed. 109 */ 110 static int 111 do_act_establish(struct sge_iq *iq, const struct rss_header *rss, 112 struct mbuf *m) 113 { 114 struct adapter *sc = iq->adapter; 115 const struct cpl_act_establish *cpl = (const void *)(rss + 1); 116 unsigned int tid = GET_TID(cpl); 117 unsigned int atid = G_TID_TID(ntohl(cpl->tos_atid)); 118 struct toepcb *toep = lookup_atid(sc, atid); 119 struct inpcb *inp = toep->inp; 120 121 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 122 KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__)); 123 124 CTR3(KTR_CXGBE, "%s: atid %u, tid %u", __func__, atid, tid); 125 free_atid(sc, atid); 126 127 INP_WLOCK(inp); 128 toep->tid = tid; 129 insert_tid(sc, tid, toep); 130 if (inp->inp_flags & INP_DROPPED) { 131 132 /* socket closed by the kernel before hw told us it connected */ 133 134 send_flowc_wr(toep, NULL); 135 send_reset(sc, toep, be32toh(cpl->snd_isn)); 136 goto done; 137 } 138 139 make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt); 140 done: 141 INP_WUNLOCK(inp); 142 return (0); 143 } 144 145 static inline int 146 act_open_has_tid(unsigned int status) 147 { 148 149 return (status != CPL_ERR_TCAM_FULL && 150 status != CPL_ERR_TCAM_PARITY && 151 status != CPL_ERR_CONN_EXIST && 152 status != CPL_ERR_ARP_MISS); 153 } 154 155 /* 156 * Convert an ACT_OPEN_RPL status to an errno. 157 */ 158 static inline int 159 act_open_rpl_status_to_errno(int status) 160 { 161 162 switch (status) { 163 case CPL_ERR_CONN_RESET: 164 return (ECONNREFUSED); 165 case CPL_ERR_ARP_MISS: 166 return (EHOSTUNREACH); 167 case CPL_ERR_CONN_TIMEDOUT: 168 return (ETIMEDOUT); 169 case CPL_ERR_TCAM_FULL: 170 return (EAGAIN); 171 case CPL_ERR_CONN_EXIST: 172 log(LOG_ERR, "ACTIVE_OPEN_RPL: 4-tuple in use\n"); 173 return (EAGAIN); 174 default: 175 return (EIO); 176 } 177 } 178 179 static int 180 do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss, 181 struct mbuf *m) 182 { 183 struct adapter *sc = iq->adapter; 184 const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1); 185 unsigned int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status))); 186 unsigned int status = G_AOPEN_STATUS(be32toh(cpl->atid_status)); 187 struct toepcb *toep = lookup_atid(sc, atid); 188 struct inpcb *inp = toep->inp; 189 struct toedev *tod = &toep->td->tod; 190 int rc; 191 192 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 193 KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__)); 194 195 CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status); 196 197 /* Ignore negative advice */ 198 if (status == CPL_ERR_RTX_NEG_ADVICE) 199 return (0); 200 201 free_atid(sc, atid); 202 toep->tid = -1; 203 204 if (status && act_open_has_tid(status)) 205 release_tid(sc, GET_TID(cpl), toep->ctrlq); 206 207 rc = act_open_rpl_status_to_errno(status); 208 if (rc != EAGAIN) 209 INP_INFO_WLOCK(&V_tcbinfo); 210 INP_WLOCK(inp); 211 toe_connect_failed(tod, inp, rc); 212 final_cpl_received(toep); /* unlocks inp */ 213 if (rc != EAGAIN) 214 INP_INFO_WUNLOCK(&V_tcbinfo); 215 216 return (0); 217 } 218 219 /* 220 * Options2 for active open. 221 */ 222 static uint32_t 223 calc_opt2a(struct socket *so) 224 { 225 struct tcpcb *tp = so_sototcpcb(so); 226 struct toepcb *toep = tp->t_toe; 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 /* 264 * active open (soconnect). 265 * 266 * State of affairs on entry: 267 * soisconnecting (so_state |= SS_ISCONNECTING) 268 * tcbinfo not locked (This has changed - used to be WLOCKed) 269 * inp WLOCKed 270 * tp->t_state = TCPS_SYN_SENT 271 * rtalloc1, RT_UNLOCK on rt. 272 */ 273 int 274 t4_connect(struct toedev *tod, struct socket *so, struct rtentry *rt, 275 struct sockaddr *nam) 276 { 277 struct adapter *sc = tod->tod_softc; 278 struct toepcb *toep = NULL; 279 struct wrqe *wr = NULL; 280 struct cpl_act_open_req *cpl; 281 struct l2t_entry *e = NULL; 282 struct ifnet *rt_ifp = rt->rt_ifp; 283 struct port_info *pi; 284 int atid = -1, mtu_idx, rscale, qid_atid, rc = ENOMEM; 285 struct inpcb *inp = sotoinpcb(so); 286 struct tcpcb *tp = intotcpcb(inp); 287 288 INP_WLOCK_ASSERT(inp); 289 290 if (nam->sa_family != AF_INET) 291 CXGBE_UNIMPLEMENTED("IPv6 connect"); 292 293 if (rt_ifp->if_type == IFT_ETHER) 294 pi = rt_ifp->if_softc; 295 else if (rt_ifp->if_type == IFT_L2VLAN) { 296 struct ifnet *ifp = VLAN_COOKIE(rt_ifp); 297 298 pi = ifp->if_softc; 299 } else if (rt_ifp->if_type == IFT_IEEE8023ADLAG) 300 return (ENOSYS); /* XXX: implement lagg support */ 301 else 302 return (ENOTSUP); 303 304 toep = alloc_toepcb(pi, -1, -1, M_NOWAIT); 305 if (toep == NULL) 306 goto failed; 307 308 atid = alloc_atid(sc, toep); 309 if (atid < 0) 310 goto failed; 311 312 e = t4_l2t_get(pi, rt_ifp, 313 rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway : nam); 314 if (e == NULL) 315 goto failed; 316 317 wr = alloc_wrqe(sizeof(*cpl), toep->ctrlq); 318 if (wr == NULL) 319 goto failed; 320 cpl = wrtod(wr); 321 322 toep->tid = atid; 323 toep->l2te = e; 324 if (sc->tt.ddp && (so->so_options & SO_NO_DDP) == 0) 325 set_tcpddp_ulp_mode(toep); 326 else 327 toep->ulp_mode = ULP_MODE_NONE; 328 SOCKBUF_LOCK(&so->so_rcv); 329 /* opt0 rcv_bufsiz initially, assumes its normal meaning later */ 330 toep->rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ); 331 SOCKBUF_UNLOCK(&so->so_rcv); 332 333 offload_socket(so, toep); 334 335 /* 336 * The kernel sets request_r_scale based on sb_max whereas we need to 337 * take hardware's MAX_RCV_WND into account too. This is normally a 338 * no-op as MAX_RCV_WND is much larger than the default sb_max. 339 */ 340 if (tp->t_flags & TF_REQ_SCALE) 341 rscale = tp->request_r_scale = select_rcv_wscale(); 342 else 343 rscale = 0; 344 mtu_idx = find_best_mtu_idx(sc, &inp->inp_inc, 0); 345 qid_atid = (toep->ofld_rxq->iq.abs_id << 14) | atid; 346 347 INIT_TP_WR(cpl, 0); 348 OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, qid_atid)); 349 inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port, &cpl->peer_ip, 350 &cpl->peer_port); 351 cpl->opt0 = calc_opt0(so, pi, e, mtu_idx, rscale, toep->rx_credits, 352 toep->ulp_mode); 353 cpl->params = select_ntuple(pi, e, sc->filter_mode); 354 cpl->opt2 = calc_opt2a(so); 355 356 CTR5(KTR_CXGBE, "%s: atid %u (%s), toep %p, inp %p", __func__, 357 toep->tid, tcpstates[tp->t_state], toep, inp); 358 359 rc = t4_l2t_send(sc, wr, e); 360 if (rc == 0) { 361 toep->flags |= TPF_CPL_PENDING; 362 return (0); 363 } 364 365 undo_offload_socket(so); 366 failed: 367 CTR5(KTR_CXGBE, "%s: FAILED, atid %d, toep %p, l2te %p, wr %p", 368 __func__, atid, toep, e, wr); 369 370 if (e) 371 t4_l2t_release(e); 372 if (wr) 373 free_wrqe(wr); 374 if (atid >= 0) 375 free_atid(sc, atid); 376 if (toep) 377 free_toepcb(toep); 378 379 return (rc); 380 } 381 #endif 382