1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * AF_SMC protocol family socket handler keeping the AF_INET sock address type 6 * applies to SOCK_STREAM sockets only 7 * offers an alternative communication option for TCP-protocol sockets 8 * applicable with RoCE-cards only 9 * 10 * Initial restrictions: 11 * - support for alternate links postponed 12 * 13 * Copyright IBM Corp. 2016, 2018 14 * 15 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 16 * based on prototype from Frank Blaschka 17 */ 18 19 #define KMSG_COMPONENT "smc" 20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/socket.h> 24 #include <linux/workqueue.h> 25 #include <linux/in.h> 26 #include <linux/sched/signal.h> 27 #include <linux/if_vlan.h> 28 #include <linux/rcupdate_wait.h> 29 #include <linux/ctype.h> 30 31 #include <net/sock.h> 32 #include <net/tcp.h> 33 #include <net/smc.h> 34 #include <asm/ioctls.h> 35 36 #include <net/net_namespace.h> 37 #include <net/netns/generic.h> 38 #include "smc_netns.h" 39 40 #include "smc.h" 41 #include "smc_clc.h" 42 #include "smc_llc.h" 43 #include "smc_cdc.h" 44 #include "smc_core.h" 45 #include "smc_ib.h" 46 #include "smc_ism.h" 47 #include "smc_pnet.h" 48 #include "smc_netlink.h" 49 #include "smc_tx.h" 50 #include "smc_rx.h" 51 #include "smc_close.h" 52 #include "smc_stats.h" 53 #include "smc_tracepoint.h" 54 55 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group 56 * creation on server 57 */ 58 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group 59 * creation on client 60 */ 61 62 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ 63 struct workqueue_struct *smc_close_wq; /* wq for close work */ 64 65 static void smc_tcp_listen_work(struct work_struct *); 66 static void smc_connect_work(struct work_struct *); 67 68 static void smc_set_keepalive(struct sock *sk, int val) 69 { 70 struct smc_sock *smc = smc_sk(sk); 71 72 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 73 } 74 75 static struct smc_hashinfo smc_v4_hashinfo = { 76 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 77 }; 78 79 static struct smc_hashinfo smc_v6_hashinfo = { 80 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 81 }; 82 83 int smc_hash_sk(struct sock *sk) 84 { 85 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 86 struct hlist_head *head; 87 88 head = &h->ht; 89 90 write_lock_bh(&h->lock); 91 sk_add_node(sk, head); 92 write_unlock_bh(&h->lock); 93 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 94 95 return 0; 96 } 97 EXPORT_SYMBOL_GPL(smc_hash_sk); 98 99 void smc_unhash_sk(struct sock *sk) 100 { 101 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 102 103 write_lock_bh(&h->lock); 104 if (sk_del_node_init(sk)) 105 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 106 write_unlock_bh(&h->lock); 107 } 108 EXPORT_SYMBOL_GPL(smc_unhash_sk); 109 110 struct proto smc_proto = { 111 .name = "SMC", 112 .owner = THIS_MODULE, 113 .keepalive = smc_set_keepalive, 114 .hash = smc_hash_sk, 115 .unhash = smc_unhash_sk, 116 .obj_size = sizeof(struct smc_sock), 117 .h.smc_hash = &smc_v4_hashinfo, 118 .slab_flags = SLAB_TYPESAFE_BY_RCU, 119 }; 120 EXPORT_SYMBOL_GPL(smc_proto); 121 122 struct proto smc_proto6 = { 123 .name = "SMC6", 124 .owner = THIS_MODULE, 125 .keepalive = smc_set_keepalive, 126 .hash = smc_hash_sk, 127 .unhash = smc_unhash_sk, 128 .obj_size = sizeof(struct smc_sock), 129 .h.smc_hash = &smc_v6_hashinfo, 130 .slab_flags = SLAB_TYPESAFE_BY_RCU, 131 }; 132 EXPORT_SYMBOL_GPL(smc_proto6); 133 134 static void smc_restore_fallback_changes(struct smc_sock *smc) 135 { 136 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ 137 smc->clcsock->file->private_data = smc->sk.sk_socket; 138 smc->clcsock->file = NULL; 139 } 140 } 141 142 static int __smc_release(struct smc_sock *smc) 143 { 144 struct sock *sk = &smc->sk; 145 int rc = 0; 146 147 if (!smc->use_fallback) { 148 rc = smc_close_active(smc); 149 sock_set_flag(sk, SOCK_DEAD); 150 sk->sk_shutdown |= SHUTDOWN_MASK; 151 } else { 152 if (sk->sk_state != SMC_CLOSED) { 153 if (sk->sk_state != SMC_LISTEN && 154 sk->sk_state != SMC_INIT) 155 sock_put(sk); /* passive closing */ 156 if (sk->sk_state == SMC_LISTEN) { 157 /* wake up clcsock accept */ 158 rc = kernel_sock_shutdown(smc->clcsock, 159 SHUT_RDWR); 160 } 161 sk->sk_state = SMC_CLOSED; 162 sk->sk_state_change(sk); 163 } 164 smc_restore_fallback_changes(smc); 165 } 166 167 sk->sk_prot->unhash(sk); 168 169 if (sk->sk_state == SMC_CLOSED) { 170 if (smc->clcsock) { 171 release_sock(sk); 172 smc_clcsock_release(smc); 173 lock_sock(sk); 174 } 175 if (!smc->use_fallback) 176 smc_conn_free(&smc->conn); 177 } 178 179 return rc; 180 } 181 182 static int smc_release(struct socket *sock) 183 { 184 struct sock *sk = sock->sk; 185 struct smc_sock *smc; 186 int rc = 0; 187 188 if (!sk) 189 goto out; 190 191 sock_hold(sk); /* sock_put below */ 192 smc = smc_sk(sk); 193 194 /* cleanup for a dangling non-blocking connect */ 195 if (smc->connect_nonblock && sk->sk_state == SMC_INIT) 196 tcp_abort(smc->clcsock->sk, ECONNABORTED); 197 198 if (cancel_work_sync(&smc->connect_work)) 199 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */ 200 201 if (sk->sk_state == SMC_LISTEN) 202 /* smc_close_non_accepted() is called and acquires 203 * sock lock for child sockets again 204 */ 205 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 206 else 207 lock_sock(sk); 208 209 rc = __smc_release(smc); 210 211 /* detach socket */ 212 sock_orphan(sk); 213 sock->sk = NULL; 214 release_sock(sk); 215 216 sock_put(sk); /* sock_hold above */ 217 sock_put(sk); /* final sock_put */ 218 out: 219 return rc; 220 } 221 222 static void smc_destruct(struct sock *sk) 223 { 224 if (sk->sk_state != SMC_CLOSED) 225 return; 226 if (!sock_flag(sk, SOCK_DEAD)) 227 return; 228 229 sk_refcnt_debug_dec(sk); 230 } 231 232 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 233 int protocol) 234 { 235 struct smc_sock *smc; 236 struct proto *prot; 237 struct sock *sk; 238 239 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 240 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 241 if (!sk) 242 return NULL; 243 244 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 245 sk->sk_state = SMC_INIT; 246 sk->sk_destruct = smc_destruct; 247 sk->sk_protocol = protocol; 248 smc = smc_sk(sk); 249 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 250 INIT_WORK(&smc->connect_work, smc_connect_work); 251 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 252 INIT_LIST_HEAD(&smc->accept_q); 253 spin_lock_init(&smc->accept_q_lock); 254 spin_lock_init(&smc->conn.send_lock); 255 sk->sk_prot->hash(sk); 256 sk_refcnt_debug_inc(sk); 257 mutex_init(&smc->clcsock_release_lock); 258 259 return sk; 260 } 261 262 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 263 int addr_len) 264 { 265 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 266 struct sock *sk = sock->sk; 267 struct smc_sock *smc; 268 int rc; 269 270 smc = smc_sk(sk); 271 272 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 273 rc = -EINVAL; 274 if (addr_len < sizeof(struct sockaddr_in)) 275 goto out; 276 277 rc = -EAFNOSUPPORT; 278 if (addr->sin_family != AF_INET && 279 addr->sin_family != AF_INET6 && 280 addr->sin_family != AF_UNSPEC) 281 goto out; 282 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 283 if (addr->sin_family == AF_UNSPEC && 284 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 285 goto out; 286 287 lock_sock(sk); 288 289 /* Check if socket is already active */ 290 rc = -EINVAL; 291 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 292 goto out_rel; 293 294 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 295 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 296 297 out_rel: 298 release_sock(sk); 299 out: 300 return rc; 301 } 302 303 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 304 unsigned long mask) 305 { 306 /* options we don't get control via setsockopt for */ 307 nsk->sk_type = osk->sk_type; 308 nsk->sk_sndbuf = osk->sk_sndbuf; 309 nsk->sk_rcvbuf = osk->sk_rcvbuf; 310 nsk->sk_sndtimeo = osk->sk_sndtimeo; 311 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 312 nsk->sk_mark = osk->sk_mark; 313 nsk->sk_priority = osk->sk_priority; 314 nsk->sk_rcvlowat = osk->sk_rcvlowat; 315 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 316 nsk->sk_err = osk->sk_err; 317 318 nsk->sk_flags &= ~mask; 319 nsk->sk_flags |= osk->sk_flags & mask; 320 } 321 322 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 323 (1UL << SOCK_KEEPOPEN) | \ 324 (1UL << SOCK_LINGER) | \ 325 (1UL << SOCK_BROADCAST) | \ 326 (1UL << SOCK_TIMESTAMP) | \ 327 (1UL << SOCK_DBG) | \ 328 (1UL << SOCK_RCVTSTAMP) | \ 329 (1UL << SOCK_RCVTSTAMPNS) | \ 330 (1UL << SOCK_LOCALROUTE) | \ 331 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 332 (1UL << SOCK_RXQ_OVFL) | \ 333 (1UL << SOCK_WIFI_STATUS) | \ 334 (1UL << SOCK_NOFCS) | \ 335 (1UL << SOCK_FILTER_LOCKED) | \ 336 (1UL << SOCK_TSTAMP_NEW)) 337 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 338 * clc socket (since smc is not called for these options from net/core) 339 */ 340 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 341 { 342 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 343 } 344 345 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 346 (1UL << SOCK_KEEPOPEN) | \ 347 (1UL << SOCK_LINGER) | \ 348 (1UL << SOCK_DBG)) 349 /* copy only settings and flags relevant for smc from clc to smc socket */ 350 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 351 { 352 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 353 } 354 355 /* register the new rmb on all links */ 356 static int smcr_lgr_reg_rmbs(struct smc_link *link, 357 struct smc_buf_desc *rmb_desc) 358 { 359 struct smc_link_group *lgr = link->lgr; 360 int i, rc = 0; 361 362 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 363 if (rc) 364 return rc; 365 /* protect against parallel smc_llc_cli_rkey_exchange() and 366 * parallel smcr_link_reg_rmb() 367 */ 368 mutex_lock(&lgr->llc_conf_mutex); 369 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 370 if (!smc_link_active(&lgr->lnk[i])) 371 continue; 372 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc); 373 if (rc) 374 goto out; 375 } 376 377 /* exchange confirm_rkey msg with peer */ 378 rc = smc_llc_do_confirm_rkey(link, rmb_desc); 379 if (rc) { 380 rc = -EFAULT; 381 goto out; 382 } 383 rmb_desc->is_conf_rkey = true; 384 out: 385 mutex_unlock(&lgr->llc_conf_mutex); 386 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 387 return rc; 388 } 389 390 static int smcr_clnt_conf_first_link(struct smc_sock *smc) 391 { 392 struct smc_link *link = smc->conn.lnk; 393 struct smc_llc_qentry *qentry; 394 int rc; 395 396 /* receive CONFIRM LINK request from server over RoCE fabric */ 397 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 398 SMC_LLC_CONFIRM_LINK); 399 if (!qentry) { 400 struct smc_clc_msg_decline dclc; 401 402 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 403 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 404 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 405 } 406 smc_llc_save_peer_uid(qentry); 407 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); 408 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 409 if (rc) 410 return SMC_CLC_DECL_RMBE_EC; 411 412 rc = smc_ib_modify_qp_rts(link); 413 if (rc) 414 return SMC_CLC_DECL_ERR_RDYLNK; 415 416 smc_wr_remember_qp_attr(link); 417 418 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 419 return SMC_CLC_DECL_ERR_REGRMB; 420 421 /* confirm_rkey is implicit on 1st contact */ 422 smc->conn.rmb_desc->is_conf_rkey = true; 423 424 /* send CONFIRM LINK response over RoCE fabric */ 425 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 426 if (rc < 0) 427 return SMC_CLC_DECL_TIMEOUT_CL; 428 429 smc_llc_link_active(link); 430 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 431 432 /* optional 2nd link, receive ADD LINK request from server */ 433 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 434 SMC_LLC_ADD_LINK); 435 if (!qentry) { 436 struct smc_clc_msg_decline dclc; 437 438 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 439 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 440 if (rc == -EAGAIN) 441 rc = 0; /* no DECLINE received, go with one link */ 442 return rc; 443 } 444 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); 445 smc_llc_cli_add_link(link, qentry); 446 return 0; 447 } 448 449 static bool smc_isascii(char *hostname) 450 { 451 int i; 452 453 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) 454 if (!isascii(hostname[i])) 455 return false; 456 return true; 457 } 458 459 static void smc_conn_save_peer_info_fce(struct smc_sock *smc, 460 struct smc_clc_msg_accept_confirm *clc) 461 { 462 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 463 (struct smc_clc_msg_accept_confirm_v2 *)clc; 464 struct smc_clc_first_contact_ext *fce; 465 int clc_v2_len; 466 467 if (clc->hdr.version == SMC_V1 || 468 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 469 return; 470 471 if (smc->conn.lgr->is_smcd) { 472 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid, 473 SMC_MAX_EID_LEN); 474 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 475 d1); 476 } else { 477 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid, 478 SMC_MAX_EID_LEN); 479 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 480 r1); 481 } 482 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len); 483 smc->conn.lgr->peer_os = fce->os_type; 484 smc->conn.lgr->peer_smc_release = fce->release; 485 if (smc_isascii(fce->hostname)) 486 memcpy(smc->conn.lgr->peer_hostname, fce->hostname, 487 SMC_MAX_HOSTNAME_LEN); 488 } 489 490 static void smcr_conn_save_peer_info(struct smc_sock *smc, 491 struct smc_clc_msg_accept_confirm *clc) 492 { 493 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); 494 495 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; 496 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); 497 smc->conn.peer_rmbe_size = bufsize; 498 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 499 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 500 } 501 502 static void smcd_conn_save_peer_info(struct smc_sock *smc, 503 struct smc_clc_msg_accept_confirm *clc) 504 { 505 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); 506 507 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; 508 smc->conn.peer_token = clc->d0.token; 509 /* msg header takes up space in the buffer */ 510 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 511 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 512 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 513 } 514 515 static void smc_conn_save_peer_info(struct smc_sock *smc, 516 struct smc_clc_msg_accept_confirm *clc) 517 { 518 if (smc->conn.lgr->is_smcd) 519 smcd_conn_save_peer_info(smc, clc); 520 else 521 smcr_conn_save_peer_info(smc, clc); 522 smc_conn_save_peer_info_fce(smc, clc); 523 } 524 525 static void smc_link_save_peer_info(struct smc_link *link, 526 struct smc_clc_msg_accept_confirm *clc, 527 struct smc_init_info *ini) 528 { 529 link->peer_qpn = ntoh24(clc->r0.qpn); 530 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE); 531 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac)); 532 link->peer_psn = ntoh24(clc->r0.psn); 533 link->peer_mtu = clc->r0.qp_mtu; 534 } 535 536 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc, 537 struct smc_stats_fback *fback_arr) 538 { 539 int cnt; 540 541 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) { 542 if (fback_arr[cnt].fback_code == smc->fallback_rsn) { 543 fback_arr[cnt].count++; 544 break; 545 } 546 if (!fback_arr[cnt].fback_code) { 547 fback_arr[cnt].fback_code = smc->fallback_rsn; 548 fback_arr[cnt].count++; 549 break; 550 } 551 } 552 } 553 554 static void smc_stat_fallback(struct smc_sock *smc) 555 { 556 struct net *net = sock_net(&smc->sk); 557 558 mutex_lock(&net->smc.mutex_fback_rsn); 559 if (smc->listen_smc) { 560 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv); 561 net->smc.fback_rsn->srv_fback_cnt++; 562 } else { 563 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt); 564 net->smc.fback_rsn->clnt_fback_cnt++; 565 } 566 mutex_unlock(&net->smc.mutex_fback_rsn); 567 } 568 569 /* must be called under rcu read lock */ 570 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key) 571 { 572 struct socket_wq *wq; 573 __poll_t flags; 574 575 wq = rcu_dereference(smc->sk.sk_wq); 576 if (!skwq_has_sleeper(wq)) 577 return; 578 579 /* wake up smc sk->sk_wq */ 580 if (!key) { 581 /* sk_state_change */ 582 wake_up_interruptible_all(&wq->wait); 583 } else { 584 flags = key_to_poll(key); 585 if (flags & (EPOLLIN | EPOLLOUT)) 586 /* sk_data_ready or sk_write_space */ 587 wake_up_interruptible_sync_poll(&wq->wait, flags); 588 else if (flags & EPOLLERR) 589 /* sk_error_report */ 590 wake_up_interruptible_poll(&wq->wait, flags); 591 } 592 } 593 594 static int smc_fback_mark_woken(wait_queue_entry_t *wait, 595 unsigned int mode, int sync, void *key) 596 { 597 struct smc_mark_woken *mark = 598 container_of(wait, struct smc_mark_woken, wait_entry); 599 600 mark->woken = true; 601 mark->key = key; 602 return 0; 603 } 604 605 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk, 606 void (*clcsock_callback)(struct sock *sk)) 607 { 608 struct smc_mark_woken mark = { .woken = false }; 609 struct socket_wq *wq; 610 611 init_waitqueue_func_entry(&mark.wait_entry, 612 smc_fback_mark_woken); 613 rcu_read_lock(); 614 wq = rcu_dereference(clcsk->sk_wq); 615 if (!wq) 616 goto out; 617 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 618 clcsock_callback(clcsk); 619 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 620 621 if (mark.woken) 622 smc_fback_wakeup_waitqueue(smc, mark.key); 623 out: 624 rcu_read_unlock(); 625 } 626 627 static void smc_fback_state_change(struct sock *clcsk) 628 { 629 struct smc_sock *smc = 630 smc_clcsock_user_data(clcsk); 631 632 if (!smc) 633 return; 634 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_state_change); 635 } 636 637 static void smc_fback_data_ready(struct sock *clcsk) 638 { 639 struct smc_sock *smc = 640 smc_clcsock_user_data(clcsk); 641 642 if (!smc) 643 return; 644 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_data_ready); 645 } 646 647 static void smc_fback_write_space(struct sock *clcsk) 648 { 649 struct smc_sock *smc = 650 smc_clcsock_user_data(clcsk); 651 652 if (!smc) 653 return; 654 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_write_space); 655 } 656 657 static void smc_fback_error_report(struct sock *clcsk) 658 { 659 struct smc_sock *smc = 660 smc_clcsock_user_data(clcsk); 661 662 if (!smc) 663 return; 664 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_error_report); 665 } 666 667 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code) 668 { 669 struct sock *clcsk; 670 671 mutex_lock(&smc->clcsock_release_lock); 672 if (!smc->clcsock) { 673 mutex_unlock(&smc->clcsock_release_lock); 674 return -EBADF; 675 } 676 clcsk = smc->clcsock->sk; 677 678 smc->use_fallback = true; 679 smc->fallback_rsn = reason_code; 680 smc_stat_fallback(smc); 681 trace_smc_switch_to_fallback(smc, reason_code); 682 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 683 smc->clcsock->file = smc->sk.sk_socket->file; 684 smc->clcsock->file->private_data = smc->clcsock; 685 smc->clcsock->wq.fasync_list = 686 smc->sk.sk_socket->wq.fasync_list; 687 688 /* There might be some wait entries remaining 689 * in smc sk->sk_wq and they should be woken up 690 * as clcsock's wait queue is woken up. 691 */ 692 smc->clcsk_state_change = clcsk->sk_state_change; 693 smc->clcsk_data_ready = clcsk->sk_data_ready; 694 smc->clcsk_write_space = clcsk->sk_write_space; 695 smc->clcsk_error_report = clcsk->sk_error_report; 696 697 clcsk->sk_state_change = smc_fback_state_change; 698 clcsk->sk_data_ready = smc_fback_data_ready; 699 clcsk->sk_write_space = smc_fback_write_space; 700 clcsk->sk_error_report = smc_fback_error_report; 701 702 smc->clcsock->sk->sk_user_data = 703 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 704 } 705 mutex_unlock(&smc->clcsock_release_lock); 706 return 0; 707 } 708 709 /* fall back during connect */ 710 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 711 { 712 struct net *net = sock_net(&smc->sk); 713 int rc = 0; 714 715 rc = smc_switch_to_fallback(smc, reason_code); 716 if (rc) { /* fallback fails */ 717 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 718 if (smc->sk.sk_state == SMC_INIT) 719 sock_put(&smc->sk); /* passive closing */ 720 return rc; 721 } 722 smc_copy_sock_settings_to_clc(smc); 723 smc->connect_nonblock = 0; 724 if (smc->sk.sk_state == SMC_INIT) 725 smc->sk.sk_state = SMC_ACTIVE; 726 return 0; 727 } 728 729 /* decline and fall back during connect */ 730 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 731 u8 version) 732 { 733 struct net *net = sock_net(&smc->sk); 734 int rc; 735 736 if (reason_code < 0) { /* error, fallback is not possible */ 737 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 738 if (smc->sk.sk_state == SMC_INIT) 739 sock_put(&smc->sk); /* passive closing */ 740 return reason_code; 741 } 742 if (reason_code != SMC_CLC_DECL_PEERDECL) { 743 rc = smc_clc_send_decline(smc, reason_code, version); 744 if (rc < 0) { 745 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 746 if (smc->sk.sk_state == SMC_INIT) 747 sock_put(&smc->sk); /* passive closing */ 748 return rc; 749 } 750 } 751 return smc_connect_fallback(smc, reason_code); 752 } 753 754 static void smc_conn_abort(struct smc_sock *smc, int local_first) 755 { 756 struct smc_connection *conn = &smc->conn; 757 struct smc_link_group *lgr = conn->lgr; 758 bool lgr_valid = false; 759 760 if (smc_conn_lgr_valid(conn)) 761 lgr_valid = true; 762 763 smc_conn_free(conn); 764 if (local_first && lgr_valid) 765 smc_lgr_cleanup_early(lgr); 766 } 767 768 /* check if there is a rdma device available for this connection. */ 769 /* called for connect and listen */ 770 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 771 { 772 /* PNET table look up: search active ib_device and port 773 * within same PNETID that also contains the ethernet device 774 * used for the internal TCP socket 775 */ 776 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 777 if (!ini->check_smcrv2 && !ini->ib_dev) 778 return SMC_CLC_DECL_NOSMCRDEV; 779 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) 780 return SMC_CLC_DECL_NOSMCRDEV; 781 return 0; 782 } 783 784 /* check if there is an ISM device available for this connection. */ 785 /* called for connect and listen */ 786 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 787 { 788 /* Find ISM device with same PNETID as connecting interface */ 789 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 790 if (!ini->ism_dev[0]) 791 return SMC_CLC_DECL_NOSMCDDEV; 792 else 793 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 794 return 0; 795 } 796 797 /* is chid unique for the ism devices that are already determined? */ 798 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 799 int cnt) 800 { 801 int i = (!ini->ism_dev[0]) ? 1 : 0; 802 803 for (; i < cnt; i++) 804 if (ini->ism_chid[i] == chid) 805 return false; 806 return true; 807 } 808 809 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus 810 * PNETID matching net_device) 811 */ 812 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 813 struct smc_init_info *ini) 814 { 815 int rc = SMC_CLC_DECL_NOSMCDDEV; 816 struct smcd_dev *smcd; 817 int i = 1; 818 u16 chid; 819 820 if (smcd_indicated(ini->smc_type_v1)) 821 rc = 0; /* already initialized for V1 */ 822 mutex_lock(&smcd_dev_list.mutex); 823 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 824 if (smcd->going_away || smcd == ini->ism_dev[0]) 825 continue; 826 chid = smc_ism_get_chid(smcd); 827 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 828 continue; 829 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 830 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 831 ini->ism_dev[i] = smcd; 832 ini->ism_chid[i] = chid; 833 ini->is_smcd = true; 834 rc = 0; 835 i++; 836 if (i > SMC_MAX_ISM_DEVS) 837 break; 838 } 839 } 840 mutex_unlock(&smcd_dev_list.mutex); 841 ini->ism_offered_cnt = i - 1; 842 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 843 ini->smcd_version = 0; 844 845 return rc; 846 } 847 848 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 849 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 850 struct smc_init_info *ini) 851 { 852 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 853 return SMC_CLC_DECL_ISMVLANERR; 854 return 0; 855 } 856 857 static int smc_find_proposal_devices(struct smc_sock *smc, 858 struct smc_init_info *ini) 859 { 860 int rc = 0; 861 862 /* check if there is an ism device available */ 863 if (!(ini->smcd_version & SMC_V1) || 864 smc_find_ism_device(smc, ini) || 865 smc_connect_ism_vlan_setup(smc, ini)) 866 ini->smcd_version &= ~SMC_V1; 867 /* else ISM V1 is supported for this connection */ 868 869 /* check if there is an rdma device available */ 870 if (!(ini->smcr_version & SMC_V1) || 871 smc_find_rdma_device(smc, ini)) 872 ini->smcr_version &= ~SMC_V1; 873 /* else RDMA is supported for this connection */ 874 875 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 876 ini->smcr_version & SMC_V1); 877 878 /* check if there is an ism v2 device available */ 879 if (!(ini->smcd_version & SMC_V2) || 880 !smc_ism_is_v2_capable() || 881 smc_find_ism_v2_device_clnt(smc, ini)) 882 ini->smcd_version &= ~SMC_V2; 883 884 /* check if there is an rdma v2 device available */ 885 ini->check_smcrv2 = true; 886 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 887 if (!(ini->smcr_version & SMC_V2) || 888 smc->clcsock->sk->sk_family != AF_INET || 889 !smc_clc_ueid_count() || 890 smc_find_rdma_device(smc, ini)) 891 ini->smcr_version &= ~SMC_V2; 892 ini->check_smcrv2 = false; 893 894 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 895 ini->smcr_version & SMC_V2); 896 897 /* if neither ISM nor RDMA are supported, fallback */ 898 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 899 rc = SMC_CLC_DECL_NOSMCDEV; 900 901 return rc; 902 } 903 904 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 905 * used, the VLAN ID will be registered again during the connection setup. 906 */ 907 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 908 struct smc_init_info *ini) 909 { 910 if (!smcd_indicated(ini->smc_type_v1)) 911 return 0; 912 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 913 return SMC_CLC_DECL_CNFERR; 914 return 0; 915 } 916 917 #define SMC_CLC_MAX_ACCEPT_LEN \ 918 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \ 919 sizeof(struct smc_clc_first_contact_ext) + \ 920 sizeof(struct smc_clc_msg_trail)) 921 922 /* CLC handshake during connect */ 923 static int smc_connect_clc(struct smc_sock *smc, 924 struct smc_clc_msg_accept_confirm_v2 *aclc2, 925 struct smc_init_info *ini) 926 { 927 int rc = 0; 928 929 /* do inband token exchange */ 930 rc = smc_clc_send_proposal(smc, ini); 931 if (rc) 932 return rc; 933 /* receive SMC Accept CLC message */ 934 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, 935 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 936 } 937 938 void smc_fill_gid_list(struct smc_link_group *lgr, 939 struct smc_gidlist *gidlist, 940 struct smc_ib_device *known_dev, u8 *known_gid) 941 { 942 struct smc_init_info *alt_ini = NULL; 943 944 memset(gidlist, 0, sizeof(*gidlist)); 945 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 946 947 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 948 if (!alt_ini) 949 goto out; 950 951 alt_ini->vlan_id = lgr->vlan_id; 952 alt_ini->check_smcrv2 = true; 953 alt_ini->smcrv2.saddr = lgr->saddr; 954 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 955 956 if (!alt_ini->smcrv2.ib_dev_v2) 957 goto out; 958 959 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 960 SMC_GID_SIZE); 961 962 out: 963 kfree(alt_ini); 964 } 965 966 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 967 struct smc_clc_msg_accept_confirm *aclc, 968 struct smc_init_info *ini) 969 { 970 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 971 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 972 struct smc_clc_first_contact_ext *fce = 973 (struct smc_clc_first_contact_ext *) 974 (((u8 *)clc_v2) + sizeof(*clc_v2)); 975 976 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 977 return 0; 978 979 if (fce->v2_direct) { 980 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 981 ini->smcrv2.uses_gateway = false; 982 } else { 983 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr, 984 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 985 ini->smcrv2.nexthop_mac, 986 &ini->smcrv2.uses_gateway)) 987 return SMC_CLC_DECL_NOROUTE; 988 if (!ini->smcrv2.uses_gateway) { 989 /* mismatch: peer claims indirect, but its direct */ 990 return SMC_CLC_DECL_NOINDIRECT; 991 } 992 } 993 return 0; 994 } 995 996 /* setup for RDMA connection of client */ 997 static int smc_connect_rdma(struct smc_sock *smc, 998 struct smc_clc_msg_accept_confirm *aclc, 999 struct smc_init_info *ini) 1000 { 1001 int i, reason_code = 0; 1002 struct smc_link *link; 1003 u8 *eid = NULL; 1004 1005 ini->is_smcd = false; 1006 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 1007 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1008 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 1009 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 1010 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 1011 1012 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 1013 if (reason_code) 1014 return reason_code; 1015 1016 mutex_lock(&smc_client_lgr_pending); 1017 reason_code = smc_conn_create(smc, ini); 1018 if (reason_code) { 1019 mutex_unlock(&smc_client_lgr_pending); 1020 return reason_code; 1021 } 1022 1023 smc_conn_save_peer_info(smc, aclc); 1024 1025 if (ini->first_contact_local) { 1026 link = smc->conn.lnk; 1027 } else { 1028 /* set link that was assigned by server */ 1029 link = NULL; 1030 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1031 struct smc_link *l = &smc->conn.lgr->lnk[i]; 1032 1033 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 1034 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 1035 SMC_GID_SIZE) && 1036 (aclc->hdr.version > SMC_V1 || 1037 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 1038 sizeof(l->peer_mac)))) { 1039 link = l; 1040 break; 1041 } 1042 } 1043 if (!link) { 1044 reason_code = SMC_CLC_DECL_NOSRVLINK; 1045 goto connect_abort; 1046 } 1047 smc_switch_link_and_count(&smc->conn, link); 1048 } 1049 1050 /* create send buffer and rmb */ 1051 if (smc_buf_create(smc, false)) { 1052 reason_code = SMC_CLC_DECL_MEM; 1053 goto connect_abort; 1054 } 1055 1056 if (ini->first_contact_local) 1057 smc_link_save_peer_info(link, aclc, ini); 1058 1059 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 1060 reason_code = SMC_CLC_DECL_ERR_RTOK; 1061 goto connect_abort; 1062 } 1063 1064 smc_close_init(smc); 1065 smc_rx_init(smc); 1066 1067 if (ini->first_contact_local) { 1068 if (smc_ib_ready_link(link)) { 1069 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1070 goto connect_abort; 1071 } 1072 } else { 1073 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 1074 reason_code = SMC_CLC_DECL_ERR_REGRMB; 1075 goto connect_abort; 1076 } 1077 } 1078 smc_rmb_sync_sg_for_device(&smc->conn); 1079 1080 if (aclc->hdr.version > SMC_V1) { 1081 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1082 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1083 1084 eid = clc_v2->r1.eid; 1085 if (ini->first_contact_local) 1086 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 1087 link->smcibdev, link->gid); 1088 } 1089 1090 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 1091 aclc->hdr.version, eid, ini); 1092 if (reason_code) 1093 goto connect_abort; 1094 1095 smc_tx_init(smc); 1096 1097 if (ini->first_contact_local) { 1098 /* QP confirmation over RoCE fabric */ 1099 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1100 reason_code = smcr_clnt_conf_first_link(smc); 1101 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1102 if (reason_code) 1103 goto connect_abort; 1104 } 1105 mutex_unlock(&smc_client_lgr_pending); 1106 1107 smc_copy_sock_settings_to_clc(smc); 1108 smc->connect_nonblock = 0; 1109 if (smc->sk.sk_state == SMC_INIT) 1110 smc->sk.sk_state = SMC_ACTIVE; 1111 1112 return 0; 1113 connect_abort: 1114 smc_conn_abort(smc, ini->first_contact_local); 1115 mutex_unlock(&smc_client_lgr_pending); 1116 smc->connect_nonblock = 0; 1117 1118 return reason_code; 1119 } 1120 1121 /* The server has chosen one of the proposed ISM devices for the communication. 1122 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1123 */ 1124 static int 1125 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 1126 struct smc_init_info *ini) 1127 { 1128 int i; 1129 1130 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1131 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1132 ini->ism_selected = i; 1133 return 0; 1134 } 1135 } 1136 1137 return -EPROTO; 1138 } 1139 1140 /* setup for ISM connection of client */ 1141 static int smc_connect_ism(struct smc_sock *smc, 1142 struct smc_clc_msg_accept_confirm *aclc, 1143 struct smc_init_info *ini) 1144 { 1145 u8 *eid = NULL; 1146 int rc = 0; 1147 1148 ini->is_smcd = true; 1149 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1150 1151 if (aclc->hdr.version == SMC_V2) { 1152 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 1153 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1154 1155 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 1156 if (rc) 1157 return rc; 1158 } 1159 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 1160 1161 /* there is only one lgr role for SMC-D; use server lock */ 1162 mutex_lock(&smc_server_lgr_pending); 1163 rc = smc_conn_create(smc, ini); 1164 if (rc) { 1165 mutex_unlock(&smc_server_lgr_pending); 1166 return rc; 1167 } 1168 1169 /* Create send and receive buffers */ 1170 rc = smc_buf_create(smc, true); 1171 if (rc) { 1172 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1173 goto connect_abort; 1174 } 1175 1176 smc_conn_save_peer_info(smc, aclc); 1177 smc_close_init(smc); 1178 smc_rx_init(smc); 1179 smc_tx_init(smc); 1180 1181 if (aclc->hdr.version > SMC_V1) { 1182 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1183 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1184 1185 eid = clc_v2->d1.eid; 1186 } 1187 1188 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1189 aclc->hdr.version, eid, NULL); 1190 if (rc) 1191 goto connect_abort; 1192 mutex_unlock(&smc_server_lgr_pending); 1193 1194 smc_copy_sock_settings_to_clc(smc); 1195 smc->connect_nonblock = 0; 1196 if (smc->sk.sk_state == SMC_INIT) 1197 smc->sk.sk_state = SMC_ACTIVE; 1198 1199 return 0; 1200 connect_abort: 1201 smc_conn_abort(smc, ini->first_contact_local); 1202 mutex_unlock(&smc_server_lgr_pending); 1203 smc->connect_nonblock = 0; 1204 1205 return rc; 1206 } 1207 1208 /* check if received accept type and version matches a proposed one */ 1209 static int smc_connect_check_aclc(struct smc_init_info *ini, 1210 struct smc_clc_msg_accept_confirm *aclc) 1211 { 1212 if (aclc->hdr.typev1 != SMC_TYPE_R && 1213 aclc->hdr.typev1 != SMC_TYPE_D) 1214 return SMC_CLC_DECL_MODEUNSUPP; 1215 1216 if (aclc->hdr.version >= SMC_V2) { 1217 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1218 !smcr_indicated(ini->smc_type_v2)) || 1219 (aclc->hdr.typev1 == SMC_TYPE_D && 1220 !smcd_indicated(ini->smc_type_v2))) 1221 return SMC_CLC_DECL_MODEUNSUPP; 1222 } else { 1223 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1224 !smcr_indicated(ini->smc_type_v1)) || 1225 (aclc->hdr.typev1 == SMC_TYPE_D && 1226 !smcd_indicated(ini->smc_type_v1))) 1227 return SMC_CLC_DECL_MODEUNSUPP; 1228 } 1229 1230 return 0; 1231 } 1232 1233 /* perform steps before actually connecting */ 1234 static int __smc_connect(struct smc_sock *smc) 1235 { 1236 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1237 struct smc_clc_msg_accept_confirm_v2 *aclc2; 1238 struct smc_clc_msg_accept_confirm *aclc; 1239 struct smc_init_info *ini = NULL; 1240 u8 *buf = NULL; 1241 int rc = 0; 1242 1243 if (smc->use_fallback) 1244 return smc_connect_fallback(smc, smc->fallback_rsn); 1245 1246 /* if peer has not signalled SMC-capability, fall back */ 1247 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1248 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1249 1250 /* IPSec connections opt out of SMC optimizations */ 1251 if (using_ipsec(smc)) 1252 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1253 version); 1254 1255 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1256 if (!ini) 1257 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1258 version); 1259 1260 ini->smcd_version = SMC_V1 | SMC_V2; 1261 ini->smcr_version = SMC_V1 | SMC_V2; 1262 ini->smc_type_v1 = SMC_TYPE_B; 1263 ini->smc_type_v2 = SMC_TYPE_B; 1264 1265 /* get vlan id from IP device */ 1266 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1267 ini->smcd_version &= ~SMC_V1; 1268 ini->smcr_version = 0; 1269 ini->smc_type_v1 = SMC_TYPE_N; 1270 if (!ini->smcd_version) { 1271 rc = SMC_CLC_DECL_GETVLANERR; 1272 goto fallback; 1273 } 1274 } 1275 1276 rc = smc_find_proposal_devices(smc, ini); 1277 if (rc) 1278 goto fallback; 1279 1280 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1281 if (!buf) { 1282 rc = SMC_CLC_DECL_MEM; 1283 goto fallback; 1284 } 1285 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1286 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1287 1288 /* perform CLC handshake */ 1289 rc = smc_connect_clc(smc, aclc2, ini); 1290 if (rc) 1291 goto vlan_cleanup; 1292 1293 /* check if smc modes and versions of CLC proposal and accept match */ 1294 rc = smc_connect_check_aclc(ini, aclc); 1295 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1296 if (rc) 1297 goto vlan_cleanup; 1298 1299 /* depending on previous steps, connect using rdma or ism */ 1300 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1301 ini->smcr_version = version; 1302 rc = smc_connect_rdma(smc, aclc, ini); 1303 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1304 ini->smcd_version = version; 1305 rc = smc_connect_ism(smc, aclc, ini); 1306 } 1307 if (rc) 1308 goto vlan_cleanup; 1309 1310 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1311 smc_connect_ism_vlan_cleanup(smc, ini); 1312 kfree(buf); 1313 kfree(ini); 1314 return 0; 1315 1316 vlan_cleanup: 1317 smc_connect_ism_vlan_cleanup(smc, ini); 1318 kfree(buf); 1319 fallback: 1320 kfree(ini); 1321 return smc_connect_decline_fallback(smc, rc, version); 1322 } 1323 1324 static void smc_connect_work(struct work_struct *work) 1325 { 1326 struct smc_sock *smc = container_of(work, struct smc_sock, 1327 connect_work); 1328 long timeo = smc->sk.sk_sndtimeo; 1329 int rc = 0; 1330 1331 if (!timeo) 1332 timeo = MAX_SCHEDULE_TIMEOUT; 1333 lock_sock(smc->clcsock->sk); 1334 if (smc->clcsock->sk->sk_err) { 1335 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1336 } else if ((1 << smc->clcsock->sk->sk_state) & 1337 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1338 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1339 if ((rc == -EPIPE) && 1340 ((1 << smc->clcsock->sk->sk_state) & 1341 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1342 rc = 0; 1343 } 1344 release_sock(smc->clcsock->sk); 1345 lock_sock(&smc->sk); 1346 if (rc != 0 || smc->sk.sk_err) { 1347 smc->sk.sk_state = SMC_CLOSED; 1348 if (rc == -EPIPE || rc == -EAGAIN) 1349 smc->sk.sk_err = EPIPE; 1350 else if (signal_pending(current)) 1351 smc->sk.sk_err = -sock_intr_errno(timeo); 1352 sock_put(&smc->sk); /* passive closing */ 1353 goto out; 1354 } 1355 1356 rc = __smc_connect(smc); 1357 if (rc < 0) 1358 smc->sk.sk_err = -rc; 1359 1360 out: 1361 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1362 if (smc->sk.sk_err) { 1363 smc->sk.sk_state_change(&smc->sk); 1364 } else { /* allow polling before and after fallback decision */ 1365 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1366 smc->sk.sk_write_space(&smc->sk); 1367 } 1368 } 1369 release_sock(&smc->sk); 1370 } 1371 1372 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1373 int alen, int flags) 1374 { 1375 struct sock *sk = sock->sk; 1376 struct smc_sock *smc; 1377 int rc = -EINVAL; 1378 1379 smc = smc_sk(sk); 1380 1381 /* separate smc parameter checking to be safe */ 1382 if (alen < sizeof(addr->sa_family)) 1383 goto out_err; 1384 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1385 goto out_err; 1386 1387 lock_sock(sk); 1388 switch (sk->sk_state) { 1389 default: 1390 goto out; 1391 case SMC_ACTIVE: 1392 rc = -EISCONN; 1393 goto out; 1394 case SMC_INIT: 1395 break; 1396 } 1397 1398 smc_copy_sock_settings_to_clc(smc); 1399 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1400 if (smc->connect_nonblock) { 1401 rc = -EALREADY; 1402 goto out; 1403 } 1404 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1405 if (rc && rc != -EINPROGRESS) 1406 goto out; 1407 1408 sock_hold(&smc->sk); /* sock put in passive closing */ 1409 if (smc->use_fallback) 1410 goto out; 1411 if (flags & O_NONBLOCK) { 1412 if (queue_work(smc_hs_wq, &smc->connect_work)) 1413 smc->connect_nonblock = 1; 1414 rc = -EINPROGRESS; 1415 } else { 1416 rc = __smc_connect(smc); 1417 if (rc < 0) 1418 goto out; 1419 else 1420 rc = 0; /* success cases including fallback */ 1421 } 1422 1423 out: 1424 release_sock(sk); 1425 out_err: 1426 return rc; 1427 } 1428 1429 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1430 { 1431 struct socket *new_clcsock = NULL; 1432 struct sock *lsk = &lsmc->sk; 1433 struct sock *new_sk; 1434 int rc = -EINVAL; 1435 1436 release_sock(lsk); 1437 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1438 if (!new_sk) { 1439 rc = -ENOMEM; 1440 lsk->sk_err = ENOMEM; 1441 *new_smc = NULL; 1442 lock_sock(lsk); 1443 goto out; 1444 } 1445 *new_smc = smc_sk(new_sk); 1446 1447 mutex_lock(&lsmc->clcsock_release_lock); 1448 if (lsmc->clcsock) 1449 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1450 mutex_unlock(&lsmc->clcsock_release_lock); 1451 lock_sock(lsk); 1452 if (rc < 0 && rc != -EAGAIN) 1453 lsk->sk_err = -rc; 1454 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1455 new_sk->sk_prot->unhash(new_sk); 1456 if (new_clcsock) 1457 sock_release(new_clcsock); 1458 new_sk->sk_state = SMC_CLOSED; 1459 sock_set_flag(new_sk, SOCK_DEAD); 1460 sock_put(new_sk); /* final */ 1461 *new_smc = NULL; 1462 goto out; 1463 } 1464 1465 /* new clcsock has inherited the smc listen-specific sk_data_ready 1466 * function; switch it back to the original sk_data_ready function 1467 */ 1468 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1469 (*new_smc)->clcsock = new_clcsock; 1470 out: 1471 return rc; 1472 } 1473 1474 /* add a just created sock to the accept queue of the listen sock as 1475 * candidate for a following socket accept call from user space 1476 */ 1477 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1478 { 1479 struct smc_sock *par = smc_sk(parent); 1480 1481 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1482 spin_lock(&par->accept_q_lock); 1483 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1484 spin_unlock(&par->accept_q_lock); 1485 sk_acceptq_added(parent); 1486 } 1487 1488 /* remove a socket from the accept queue of its parental listening socket */ 1489 static void smc_accept_unlink(struct sock *sk) 1490 { 1491 struct smc_sock *par = smc_sk(sk)->listen_smc; 1492 1493 spin_lock(&par->accept_q_lock); 1494 list_del_init(&smc_sk(sk)->accept_q); 1495 spin_unlock(&par->accept_q_lock); 1496 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1497 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1498 } 1499 1500 /* remove a sock from the accept queue to bind it to a new socket created 1501 * for a socket accept call from user space 1502 */ 1503 struct sock *smc_accept_dequeue(struct sock *parent, 1504 struct socket *new_sock) 1505 { 1506 struct smc_sock *isk, *n; 1507 struct sock *new_sk; 1508 1509 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1510 new_sk = (struct sock *)isk; 1511 1512 smc_accept_unlink(new_sk); 1513 if (new_sk->sk_state == SMC_CLOSED) { 1514 new_sk->sk_prot->unhash(new_sk); 1515 if (isk->clcsock) { 1516 sock_release(isk->clcsock); 1517 isk->clcsock = NULL; 1518 } 1519 sock_put(new_sk); /* final */ 1520 continue; 1521 } 1522 if (new_sock) { 1523 sock_graft(new_sk, new_sock); 1524 if (isk->use_fallback) { 1525 smc_sk(new_sk)->clcsock->file = new_sock->file; 1526 isk->clcsock->file->private_data = isk->clcsock; 1527 } 1528 } 1529 return new_sk; 1530 } 1531 return NULL; 1532 } 1533 1534 /* clean up for a created but never accepted sock */ 1535 void smc_close_non_accepted(struct sock *sk) 1536 { 1537 struct smc_sock *smc = smc_sk(sk); 1538 1539 sock_hold(sk); /* sock_put below */ 1540 lock_sock(sk); 1541 if (!sk->sk_lingertime) 1542 /* wait for peer closing */ 1543 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1544 __smc_release(smc); 1545 release_sock(sk); 1546 sock_put(sk); /* sock_hold above */ 1547 sock_put(sk); /* final sock_put */ 1548 } 1549 1550 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1551 { 1552 struct smc_link *link = smc->conn.lnk; 1553 struct smc_llc_qentry *qentry; 1554 int rc; 1555 1556 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1557 return SMC_CLC_DECL_ERR_REGRMB; 1558 1559 /* send CONFIRM LINK request to client over the RoCE fabric */ 1560 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1561 if (rc < 0) 1562 return SMC_CLC_DECL_TIMEOUT_CL; 1563 1564 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1565 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1566 SMC_LLC_CONFIRM_LINK); 1567 if (!qentry) { 1568 struct smc_clc_msg_decline dclc; 1569 1570 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1571 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1572 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1573 } 1574 smc_llc_save_peer_uid(qentry); 1575 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1576 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1577 if (rc) 1578 return SMC_CLC_DECL_RMBE_EC; 1579 1580 /* confirm_rkey is implicit on 1st contact */ 1581 smc->conn.rmb_desc->is_conf_rkey = true; 1582 1583 smc_llc_link_active(link); 1584 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1585 1586 /* initial contact - try to establish second link */ 1587 smc_llc_srv_add_link(link, NULL); 1588 return 0; 1589 } 1590 1591 /* listen worker: finish */ 1592 static void smc_listen_out(struct smc_sock *new_smc) 1593 { 1594 struct smc_sock *lsmc = new_smc->listen_smc; 1595 struct sock *newsmcsk = &new_smc->sk; 1596 1597 if (lsmc->sk.sk_state == SMC_LISTEN) { 1598 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1599 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1600 release_sock(&lsmc->sk); 1601 } else { /* no longer listening */ 1602 smc_close_non_accepted(newsmcsk); 1603 } 1604 1605 /* Wake up accept */ 1606 lsmc->sk.sk_data_ready(&lsmc->sk); 1607 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1608 } 1609 1610 /* listen worker: finish in state connected */ 1611 static void smc_listen_out_connected(struct smc_sock *new_smc) 1612 { 1613 struct sock *newsmcsk = &new_smc->sk; 1614 1615 sk_refcnt_debug_inc(newsmcsk); 1616 if (newsmcsk->sk_state == SMC_INIT) 1617 newsmcsk->sk_state = SMC_ACTIVE; 1618 1619 smc_listen_out(new_smc); 1620 } 1621 1622 /* listen worker: finish in error state */ 1623 static void smc_listen_out_err(struct smc_sock *new_smc) 1624 { 1625 struct sock *newsmcsk = &new_smc->sk; 1626 struct net *net = sock_net(newsmcsk); 1627 1628 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1629 if (newsmcsk->sk_state == SMC_INIT) 1630 sock_put(&new_smc->sk); /* passive closing */ 1631 newsmcsk->sk_state = SMC_CLOSED; 1632 1633 smc_listen_out(new_smc); 1634 } 1635 1636 /* listen worker: decline and fall back if possible */ 1637 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1638 int local_first, u8 version) 1639 { 1640 /* RDMA setup failed, switch back to TCP */ 1641 smc_conn_abort(new_smc, local_first); 1642 if (reason_code < 0 || 1643 smc_switch_to_fallback(new_smc, reason_code)) { 1644 /* error, no fallback possible */ 1645 smc_listen_out_err(new_smc); 1646 return; 1647 } 1648 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1649 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1650 smc_listen_out_err(new_smc); 1651 return; 1652 } 1653 } 1654 smc_listen_out_connected(new_smc); 1655 } 1656 1657 /* listen worker: version checking */ 1658 static int smc_listen_v2_check(struct smc_sock *new_smc, 1659 struct smc_clc_msg_proposal *pclc, 1660 struct smc_init_info *ini) 1661 { 1662 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1663 struct smc_clc_v2_extension *pclc_v2_ext; 1664 int rc = SMC_CLC_DECL_PEERNOSMC; 1665 1666 ini->smc_type_v1 = pclc->hdr.typev1; 1667 ini->smc_type_v2 = pclc->hdr.typev2; 1668 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1669 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1670 if (pclc->hdr.version > SMC_V1) { 1671 if (smcd_indicated(ini->smc_type_v2)) 1672 ini->smcd_version |= SMC_V2; 1673 if (smcr_indicated(ini->smc_type_v2)) 1674 ini->smcr_version |= SMC_V2; 1675 } 1676 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 1677 rc = SMC_CLC_DECL_PEERNOSMC; 1678 goto out; 1679 } 1680 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1681 if (!pclc_v2_ext) { 1682 ini->smcd_version &= ~SMC_V2; 1683 ini->smcr_version &= ~SMC_V2; 1684 rc = SMC_CLC_DECL_NOV2EXT; 1685 goto out; 1686 } 1687 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1688 if (ini->smcd_version & SMC_V2) { 1689 if (!smc_ism_is_v2_capable()) { 1690 ini->smcd_version &= ~SMC_V2; 1691 rc = SMC_CLC_DECL_NOISM2SUPP; 1692 } else if (!pclc_smcd_v2_ext) { 1693 ini->smcd_version &= ~SMC_V2; 1694 rc = SMC_CLC_DECL_NOV2DEXT; 1695 } else if (!pclc_v2_ext->hdr.eid_cnt && 1696 !pclc_v2_ext->hdr.flag.seid) { 1697 ini->smcd_version &= ~SMC_V2; 1698 rc = SMC_CLC_DECL_NOUEID; 1699 } 1700 } 1701 if (ini->smcr_version & SMC_V2) { 1702 if (!pclc_v2_ext->hdr.eid_cnt) { 1703 ini->smcr_version &= ~SMC_V2; 1704 rc = SMC_CLC_DECL_NOUEID; 1705 } 1706 } 1707 1708 out: 1709 if (!ini->smcd_version && !ini->smcr_version) 1710 return rc; 1711 1712 return 0; 1713 } 1714 1715 /* listen worker: check prefixes */ 1716 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1717 struct smc_clc_msg_proposal *pclc) 1718 { 1719 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1720 struct socket *newclcsock = new_smc->clcsock; 1721 1722 if (pclc->hdr.typev1 == SMC_TYPE_N) 1723 return 0; 1724 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1725 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1726 return SMC_CLC_DECL_DIFFPREFIX; 1727 1728 return 0; 1729 } 1730 1731 /* listen worker: initialize connection and buffers */ 1732 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1733 struct smc_init_info *ini) 1734 { 1735 int rc; 1736 1737 /* allocate connection / link group */ 1738 rc = smc_conn_create(new_smc, ini); 1739 if (rc) 1740 return rc; 1741 1742 /* create send buffer and rmb */ 1743 if (smc_buf_create(new_smc, false)) 1744 return SMC_CLC_DECL_MEM; 1745 1746 return 0; 1747 } 1748 1749 /* listen worker: initialize connection and buffers for SMC-D */ 1750 static int smc_listen_ism_init(struct smc_sock *new_smc, 1751 struct smc_init_info *ini) 1752 { 1753 int rc; 1754 1755 rc = smc_conn_create(new_smc, ini); 1756 if (rc) 1757 return rc; 1758 1759 /* Create send and receive buffers */ 1760 rc = smc_buf_create(new_smc, true); 1761 if (rc) { 1762 smc_conn_abort(new_smc, ini->first_contact_local); 1763 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1764 SMC_CLC_DECL_MEM; 1765 } 1766 1767 return 0; 1768 } 1769 1770 static bool smc_is_already_selected(struct smcd_dev *smcd, 1771 struct smc_init_info *ini, 1772 int matches) 1773 { 1774 int i; 1775 1776 for (i = 0; i < matches; i++) 1777 if (smcd == ini->ism_dev[i]) 1778 return true; 1779 1780 return false; 1781 } 1782 1783 /* check for ISM devices matching proposed ISM devices */ 1784 static void smc_check_ism_v2_match(struct smc_init_info *ini, 1785 u16 proposed_chid, u64 proposed_gid, 1786 unsigned int *matches) 1787 { 1788 struct smcd_dev *smcd; 1789 1790 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1791 if (smcd->going_away) 1792 continue; 1793 if (smc_is_already_selected(smcd, ini, *matches)) 1794 continue; 1795 if (smc_ism_get_chid(smcd) == proposed_chid && 1796 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1797 ini->ism_peer_gid[*matches] = proposed_gid; 1798 ini->ism_dev[*matches] = smcd; 1799 (*matches)++; 1800 break; 1801 } 1802 } 1803 } 1804 1805 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 1806 { 1807 if (!ini->rc) 1808 ini->rc = rc; 1809 } 1810 1811 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1812 struct smc_clc_msg_proposal *pclc, 1813 struct smc_init_info *ini) 1814 { 1815 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1816 struct smc_clc_v2_extension *smc_v2_ext; 1817 struct smc_clc_msg_smcd *pclc_smcd; 1818 unsigned int matches = 0; 1819 u8 smcd_version; 1820 u8 *eid = NULL; 1821 int i, rc; 1822 1823 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1824 goto not_found; 1825 1826 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1827 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1828 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1829 1830 mutex_lock(&smcd_dev_list.mutex); 1831 if (pclc_smcd->ism.chid) 1832 /* check for ISM device matching proposed native ISM device */ 1833 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1834 ntohll(pclc_smcd->ism.gid), &matches); 1835 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1836 /* check for ISM devices matching proposed non-native ISM 1837 * devices 1838 */ 1839 smc_check_ism_v2_match(ini, 1840 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1841 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1842 &matches); 1843 } 1844 mutex_unlock(&smcd_dev_list.mutex); 1845 1846 if (!ini->ism_dev[0]) { 1847 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 1848 goto not_found; 1849 } 1850 1851 smc_ism_get_system_eid(&eid); 1852 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 1853 smcd_v2_ext->system_eid, eid)) 1854 goto not_found; 1855 1856 /* separate - outside the smcd_dev_list.lock */ 1857 smcd_version = ini->smcd_version; 1858 for (i = 0; i < matches; i++) { 1859 ini->smcd_version = SMC_V2; 1860 ini->is_smcd = true; 1861 ini->ism_selected = i; 1862 rc = smc_listen_ism_init(new_smc, ini); 1863 if (rc) { 1864 smc_find_ism_store_rc(rc, ini); 1865 /* try next active ISM device */ 1866 continue; 1867 } 1868 return; /* matching and usable V2 ISM device found */ 1869 } 1870 /* no V2 ISM device could be initialized */ 1871 ini->smcd_version = smcd_version; /* restore original value */ 1872 ini->negotiated_eid[0] = 0; 1873 1874 not_found: 1875 ini->smcd_version &= ~SMC_V2; 1876 ini->ism_dev[0] = NULL; 1877 ini->is_smcd = false; 1878 } 1879 1880 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1881 struct smc_clc_msg_proposal *pclc, 1882 struct smc_init_info *ini) 1883 { 1884 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1885 int rc = 0; 1886 1887 /* check if ISM V1 is available */ 1888 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1889 goto not_found; 1890 ini->is_smcd = true; /* prepare ISM check */ 1891 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1892 rc = smc_find_ism_device(new_smc, ini); 1893 if (rc) 1894 goto not_found; 1895 ini->ism_selected = 0; 1896 rc = smc_listen_ism_init(new_smc, ini); 1897 if (!rc) 1898 return; /* V1 ISM device found */ 1899 1900 not_found: 1901 smc_find_ism_store_rc(rc, ini); 1902 ini->smcd_version &= ~SMC_V1; 1903 ini->ism_dev[0] = NULL; 1904 ini->is_smcd = false; 1905 } 1906 1907 /* listen worker: register buffers */ 1908 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1909 { 1910 struct smc_connection *conn = &new_smc->conn; 1911 1912 if (!local_first) { 1913 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1914 return SMC_CLC_DECL_ERR_REGRMB; 1915 } 1916 smc_rmb_sync_sg_for_device(&new_smc->conn); 1917 1918 return 0; 1919 } 1920 1921 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 1922 struct smc_clc_msg_proposal *pclc, 1923 struct smc_init_info *ini) 1924 { 1925 struct smc_clc_v2_extension *smc_v2_ext; 1926 u8 smcr_version; 1927 int rc; 1928 1929 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 1930 goto not_found; 1931 1932 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1933 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 1934 goto not_found; 1935 1936 /* prepare RDMA check */ 1937 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1938 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 1939 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1940 ini->check_smcrv2 = true; 1941 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 1942 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 1943 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 1944 rc = smc_find_rdma_device(new_smc, ini); 1945 if (rc) { 1946 smc_find_ism_store_rc(rc, ini); 1947 goto not_found; 1948 } 1949 if (!ini->smcrv2.uses_gateway) 1950 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 1951 1952 smcr_version = ini->smcr_version; 1953 ini->smcr_version = SMC_V2; 1954 rc = smc_listen_rdma_init(new_smc, ini); 1955 if (!rc) 1956 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1957 if (!rc) 1958 return; 1959 ini->smcr_version = smcr_version; 1960 smc_find_ism_store_rc(rc, ini); 1961 1962 not_found: 1963 ini->smcr_version &= ~SMC_V2; 1964 ini->check_smcrv2 = false; 1965 } 1966 1967 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1968 struct smc_clc_msg_proposal *pclc, 1969 struct smc_init_info *ini) 1970 { 1971 int rc; 1972 1973 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 1974 return SMC_CLC_DECL_NOSMCDEV; 1975 1976 /* prepare RDMA check */ 1977 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1978 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 1979 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1980 rc = smc_find_rdma_device(new_smc, ini); 1981 if (rc) { 1982 /* no RDMA device found */ 1983 return SMC_CLC_DECL_NOSMCDEV; 1984 } 1985 rc = smc_listen_rdma_init(new_smc, ini); 1986 if (rc) 1987 return rc; 1988 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1989 } 1990 1991 /* determine the local device matching to proposal */ 1992 static int smc_listen_find_device(struct smc_sock *new_smc, 1993 struct smc_clc_msg_proposal *pclc, 1994 struct smc_init_info *ini) 1995 { 1996 int prfx_rc; 1997 1998 /* check for ISM device matching V2 proposed device */ 1999 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 2000 if (ini->ism_dev[0]) 2001 return 0; 2002 2003 /* check for matching IP prefix and subnet length (V1) */ 2004 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 2005 if (prfx_rc) 2006 smc_find_ism_store_rc(prfx_rc, ini); 2007 2008 /* get vlan id from IP device */ 2009 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 2010 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 2011 2012 /* check for ISM device matching V1 proposed device */ 2013 if (!prfx_rc) 2014 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 2015 if (ini->ism_dev[0]) 2016 return 0; 2017 2018 if (!smcr_indicated(pclc->hdr.typev1) && 2019 !smcr_indicated(pclc->hdr.typev2)) 2020 /* skip RDMA and decline */ 2021 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 2022 2023 /* check if RDMA V2 is available */ 2024 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 2025 if (ini->smcrv2.ib_dev_v2) 2026 return 0; 2027 2028 /* check if RDMA V1 is available */ 2029 if (!prfx_rc) { 2030 int rc; 2031 2032 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 2033 smc_find_ism_store_rc(rc, ini); 2034 return (!rc) ? 0 : ini->rc; 2035 } 2036 return SMC_CLC_DECL_NOSMCDEV; 2037 } 2038 2039 /* listen worker: finish RDMA setup */ 2040 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 2041 struct smc_clc_msg_accept_confirm *cclc, 2042 bool local_first, 2043 struct smc_init_info *ini) 2044 { 2045 struct smc_link *link = new_smc->conn.lnk; 2046 int reason_code = 0; 2047 2048 if (local_first) 2049 smc_link_save_peer_info(link, cclc, ini); 2050 2051 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 2052 return SMC_CLC_DECL_ERR_RTOK; 2053 2054 if (local_first) { 2055 if (smc_ib_ready_link(link)) 2056 return SMC_CLC_DECL_ERR_RDYLNK; 2057 /* QP confirmation over RoCE fabric */ 2058 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 2059 reason_code = smcr_serv_conf_first_link(new_smc); 2060 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 2061 } 2062 return reason_code; 2063 } 2064 2065 /* setup for connection of server */ 2066 static void smc_listen_work(struct work_struct *work) 2067 { 2068 struct smc_sock *new_smc = container_of(work, struct smc_sock, 2069 smc_listen_work); 2070 struct socket *newclcsock = new_smc->clcsock; 2071 struct smc_clc_msg_accept_confirm *cclc; 2072 struct smc_clc_msg_proposal_area *buf; 2073 struct smc_clc_msg_proposal *pclc; 2074 struct smc_init_info *ini = NULL; 2075 u8 proposal_version = SMC_V1; 2076 u8 accept_version; 2077 int rc = 0; 2078 2079 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 2080 return smc_listen_out_err(new_smc); 2081 2082 if (new_smc->use_fallback) { 2083 smc_listen_out_connected(new_smc); 2084 return; 2085 } 2086 2087 /* check if peer is smc capable */ 2088 if (!tcp_sk(newclcsock->sk)->syn_smc) { 2089 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 2090 if (rc) 2091 smc_listen_out_err(new_smc); 2092 else 2093 smc_listen_out_connected(new_smc); 2094 return; 2095 } 2096 2097 /* do inband token exchange - 2098 * wait for and receive SMC Proposal CLC message 2099 */ 2100 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 2101 if (!buf) { 2102 rc = SMC_CLC_DECL_MEM; 2103 goto out_decl; 2104 } 2105 pclc = (struct smc_clc_msg_proposal *)buf; 2106 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2107 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2108 if (rc) 2109 goto out_decl; 2110 2111 if (pclc->hdr.version > SMC_V1) 2112 proposal_version = SMC_V2; 2113 2114 /* IPSec connections opt out of SMC optimizations */ 2115 if (using_ipsec(new_smc)) { 2116 rc = SMC_CLC_DECL_IPSEC; 2117 goto out_decl; 2118 } 2119 2120 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2121 if (!ini) { 2122 rc = SMC_CLC_DECL_MEM; 2123 goto out_decl; 2124 } 2125 2126 /* initial version checking */ 2127 rc = smc_listen_v2_check(new_smc, pclc, ini); 2128 if (rc) 2129 goto out_decl; 2130 2131 mutex_lock(&smc_server_lgr_pending); 2132 smc_close_init(new_smc); 2133 smc_rx_init(new_smc); 2134 smc_tx_init(new_smc); 2135 2136 /* determine ISM or RoCE device used for connection */ 2137 rc = smc_listen_find_device(new_smc, pclc, ini); 2138 if (rc) 2139 goto out_unlock; 2140 2141 /* send SMC Accept CLC message */ 2142 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2143 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2144 accept_version, ini->negotiated_eid); 2145 if (rc) 2146 goto out_unlock; 2147 2148 /* SMC-D does not need this lock any more */ 2149 if (ini->is_smcd) 2150 mutex_unlock(&smc_server_lgr_pending); 2151 2152 /* receive SMC Confirm CLC message */ 2153 memset(buf, 0, sizeof(*buf)); 2154 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2155 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2156 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2157 if (rc) { 2158 if (!ini->is_smcd) 2159 goto out_unlock; 2160 goto out_decl; 2161 } 2162 2163 /* finish worker */ 2164 if (!ini->is_smcd) { 2165 rc = smc_listen_rdma_finish(new_smc, cclc, 2166 ini->first_contact_local, ini); 2167 if (rc) 2168 goto out_unlock; 2169 mutex_unlock(&smc_server_lgr_pending); 2170 } 2171 smc_conn_save_peer_info(new_smc, cclc); 2172 smc_listen_out_connected(new_smc); 2173 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2174 goto out_free; 2175 2176 out_unlock: 2177 mutex_unlock(&smc_server_lgr_pending); 2178 out_decl: 2179 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2180 proposal_version); 2181 out_free: 2182 kfree(ini); 2183 kfree(buf); 2184 } 2185 2186 static void smc_tcp_listen_work(struct work_struct *work) 2187 { 2188 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2189 tcp_listen_work); 2190 struct sock *lsk = &lsmc->sk; 2191 struct smc_sock *new_smc; 2192 int rc = 0; 2193 2194 lock_sock(lsk); 2195 while (lsk->sk_state == SMC_LISTEN) { 2196 rc = smc_clcsock_accept(lsmc, &new_smc); 2197 if (rc) /* clcsock accept queue empty or error */ 2198 goto out; 2199 if (!new_smc) 2200 continue; 2201 2202 new_smc->listen_smc = lsmc; 2203 new_smc->use_fallback = lsmc->use_fallback; 2204 new_smc->fallback_rsn = lsmc->fallback_rsn; 2205 sock_hold(lsk); /* sock_put in smc_listen_work */ 2206 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2207 smc_copy_sock_settings_to_smc(new_smc); 2208 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 2209 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 2210 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2211 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2212 sock_put(&new_smc->sk); 2213 } 2214 2215 out: 2216 release_sock(lsk); 2217 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2218 } 2219 2220 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2221 { 2222 struct smc_sock *lsmc = 2223 smc_clcsock_user_data(listen_clcsock); 2224 2225 if (!lsmc) 2226 return; 2227 lsmc->clcsk_data_ready(listen_clcsock); 2228 if (lsmc->sk.sk_state == SMC_LISTEN) { 2229 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2230 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 2231 sock_put(&lsmc->sk); 2232 } 2233 } 2234 2235 static int smc_listen(struct socket *sock, int backlog) 2236 { 2237 struct sock *sk = sock->sk; 2238 struct smc_sock *smc; 2239 int rc; 2240 2241 smc = smc_sk(sk); 2242 lock_sock(sk); 2243 2244 rc = -EINVAL; 2245 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2246 smc->connect_nonblock) 2247 goto out; 2248 2249 rc = 0; 2250 if (sk->sk_state == SMC_LISTEN) { 2251 sk->sk_max_ack_backlog = backlog; 2252 goto out; 2253 } 2254 /* some socket options are handled in core, so we could not apply 2255 * them to the clc socket -- copy smc socket options to clc socket 2256 */ 2257 smc_copy_sock_settings_to_clc(smc); 2258 if (!smc->use_fallback) 2259 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2260 2261 /* save original sk_data_ready function and establish 2262 * smc-specific sk_data_ready function 2263 */ 2264 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 2265 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 2266 smc->clcsock->sk->sk_user_data = 2267 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2268 rc = kernel_listen(smc->clcsock, backlog); 2269 if (rc) { 2270 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready; 2271 goto out; 2272 } 2273 sk->sk_max_ack_backlog = backlog; 2274 sk->sk_ack_backlog = 0; 2275 sk->sk_state = SMC_LISTEN; 2276 2277 out: 2278 release_sock(sk); 2279 return rc; 2280 } 2281 2282 static int smc_accept(struct socket *sock, struct socket *new_sock, 2283 int flags, bool kern) 2284 { 2285 struct sock *sk = sock->sk, *nsk; 2286 DECLARE_WAITQUEUE(wait, current); 2287 struct smc_sock *lsmc; 2288 long timeo; 2289 int rc = 0; 2290 2291 lsmc = smc_sk(sk); 2292 sock_hold(sk); /* sock_put below */ 2293 lock_sock(sk); 2294 2295 if (lsmc->sk.sk_state != SMC_LISTEN) { 2296 rc = -EINVAL; 2297 release_sock(sk); 2298 goto out; 2299 } 2300 2301 /* Wait for an incoming connection */ 2302 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2303 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2304 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2305 set_current_state(TASK_INTERRUPTIBLE); 2306 if (!timeo) { 2307 rc = -EAGAIN; 2308 break; 2309 } 2310 release_sock(sk); 2311 timeo = schedule_timeout(timeo); 2312 /* wakeup by sk_data_ready in smc_listen_work() */ 2313 sched_annotate_sleep(); 2314 lock_sock(sk); 2315 if (signal_pending(current)) { 2316 rc = sock_intr_errno(timeo); 2317 break; 2318 } 2319 } 2320 set_current_state(TASK_RUNNING); 2321 remove_wait_queue(sk_sleep(sk), &wait); 2322 2323 if (!rc) 2324 rc = sock_error(nsk); 2325 release_sock(sk); 2326 if (rc) 2327 goto out; 2328 2329 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 2330 /* wait till data arrives on the socket */ 2331 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 2332 MSEC_PER_SEC); 2333 if (smc_sk(nsk)->use_fallback) { 2334 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2335 2336 lock_sock(clcsk); 2337 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2338 sk_wait_data(clcsk, &timeo, NULL); 2339 release_sock(clcsk); 2340 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2341 lock_sock(nsk); 2342 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 2343 release_sock(nsk); 2344 } 2345 } 2346 2347 out: 2348 sock_put(sk); /* sock_hold above */ 2349 return rc; 2350 } 2351 2352 static int smc_getname(struct socket *sock, struct sockaddr *addr, 2353 int peer) 2354 { 2355 struct smc_sock *smc; 2356 2357 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2358 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2359 return -ENOTCONN; 2360 2361 smc = smc_sk(sock->sk); 2362 2363 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2364 } 2365 2366 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2367 { 2368 struct sock *sk = sock->sk; 2369 struct smc_sock *smc; 2370 int rc = -EPIPE; 2371 2372 smc = smc_sk(sk); 2373 lock_sock(sk); 2374 if ((sk->sk_state != SMC_ACTIVE) && 2375 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2376 (sk->sk_state != SMC_INIT)) 2377 goto out; 2378 2379 if (msg->msg_flags & MSG_FASTOPEN) { 2380 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2381 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2382 if (rc) 2383 goto out; 2384 } else { 2385 rc = -EINVAL; 2386 goto out; 2387 } 2388 } 2389 2390 if (smc->use_fallback) { 2391 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2392 } else { 2393 rc = smc_tx_sendmsg(smc, msg, len); 2394 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2395 } 2396 out: 2397 release_sock(sk); 2398 return rc; 2399 } 2400 2401 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2402 int flags) 2403 { 2404 struct sock *sk = sock->sk; 2405 struct smc_sock *smc; 2406 int rc = -ENOTCONN; 2407 2408 smc = smc_sk(sk); 2409 lock_sock(sk); 2410 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2411 /* socket was connected before, no more data to read */ 2412 rc = 0; 2413 goto out; 2414 } 2415 if ((sk->sk_state == SMC_INIT) || 2416 (sk->sk_state == SMC_LISTEN) || 2417 (sk->sk_state == SMC_CLOSED)) 2418 goto out; 2419 2420 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2421 rc = 0; 2422 goto out; 2423 } 2424 2425 if (smc->use_fallback) { 2426 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2427 } else { 2428 msg->msg_namelen = 0; 2429 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2430 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2431 } 2432 2433 out: 2434 release_sock(sk); 2435 return rc; 2436 } 2437 2438 static __poll_t smc_accept_poll(struct sock *parent) 2439 { 2440 struct smc_sock *isk = smc_sk(parent); 2441 __poll_t mask = 0; 2442 2443 spin_lock(&isk->accept_q_lock); 2444 if (!list_empty(&isk->accept_q)) 2445 mask = EPOLLIN | EPOLLRDNORM; 2446 spin_unlock(&isk->accept_q_lock); 2447 2448 return mask; 2449 } 2450 2451 static __poll_t smc_poll(struct file *file, struct socket *sock, 2452 poll_table *wait) 2453 { 2454 struct sock *sk = sock->sk; 2455 struct smc_sock *smc; 2456 __poll_t mask = 0; 2457 2458 if (!sk) 2459 return EPOLLNVAL; 2460 2461 smc = smc_sk(sock->sk); 2462 if (smc->use_fallback) { 2463 /* delegate to CLC child sock */ 2464 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2465 sk->sk_err = smc->clcsock->sk->sk_err; 2466 } else { 2467 if (sk->sk_state != SMC_CLOSED) 2468 sock_poll_wait(file, sock, wait); 2469 if (sk->sk_err) 2470 mask |= EPOLLERR; 2471 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2472 (sk->sk_state == SMC_CLOSED)) 2473 mask |= EPOLLHUP; 2474 if (sk->sk_state == SMC_LISTEN) { 2475 /* woken up by sk_data_ready in smc_listen_work() */ 2476 mask |= smc_accept_poll(sk); 2477 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2478 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2479 wait); 2480 sk->sk_err = smc->clcsock->sk->sk_err; 2481 } else { 2482 if ((sk->sk_state != SMC_INIT && 2483 atomic_read(&smc->conn.sndbuf_space)) || 2484 sk->sk_shutdown & SEND_SHUTDOWN) { 2485 mask |= EPOLLOUT | EPOLLWRNORM; 2486 } else { 2487 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2488 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2489 } 2490 if (atomic_read(&smc->conn.bytes_to_rcv)) 2491 mask |= EPOLLIN | EPOLLRDNORM; 2492 if (sk->sk_shutdown & RCV_SHUTDOWN) 2493 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2494 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2495 mask |= EPOLLIN; 2496 if (smc->conn.urg_state == SMC_URG_VALID) 2497 mask |= EPOLLPRI; 2498 } 2499 } 2500 2501 return mask; 2502 } 2503 2504 static int smc_shutdown(struct socket *sock, int how) 2505 { 2506 struct sock *sk = sock->sk; 2507 bool do_shutdown = true; 2508 struct smc_sock *smc; 2509 int rc = -EINVAL; 2510 int old_state; 2511 int rc1 = 0; 2512 2513 smc = smc_sk(sk); 2514 2515 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2516 return rc; 2517 2518 lock_sock(sk); 2519 2520 rc = -ENOTCONN; 2521 if ((sk->sk_state != SMC_ACTIVE) && 2522 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2523 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2524 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2525 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2526 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2527 goto out; 2528 if (smc->use_fallback) { 2529 rc = kernel_sock_shutdown(smc->clcsock, how); 2530 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2531 if (sk->sk_shutdown == SHUTDOWN_MASK) 2532 sk->sk_state = SMC_CLOSED; 2533 goto out; 2534 } 2535 switch (how) { 2536 case SHUT_RDWR: /* shutdown in both directions */ 2537 old_state = sk->sk_state; 2538 rc = smc_close_active(smc); 2539 if (old_state == SMC_ACTIVE && 2540 sk->sk_state == SMC_PEERCLOSEWAIT1) 2541 do_shutdown = false; 2542 break; 2543 case SHUT_WR: 2544 rc = smc_close_shutdown_write(smc); 2545 break; 2546 case SHUT_RD: 2547 rc = 0; 2548 /* nothing more to do because peer is not involved */ 2549 break; 2550 } 2551 if (do_shutdown && smc->clcsock) 2552 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2553 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2554 sk->sk_shutdown |= how + 1; 2555 2556 out: 2557 release_sock(sk); 2558 return rc ? rc : rc1; 2559 } 2560 2561 static int smc_setsockopt(struct socket *sock, int level, int optname, 2562 sockptr_t optval, unsigned int optlen) 2563 { 2564 struct sock *sk = sock->sk; 2565 struct smc_sock *smc; 2566 int val, rc; 2567 2568 if (level == SOL_TCP && optname == TCP_ULP) 2569 return -EOPNOTSUPP; 2570 2571 smc = smc_sk(sk); 2572 2573 /* generic setsockopts reaching us here always apply to the 2574 * CLC socket 2575 */ 2576 mutex_lock(&smc->clcsock_release_lock); 2577 if (!smc->clcsock) { 2578 mutex_unlock(&smc->clcsock_release_lock); 2579 return -EBADF; 2580 } 2581 if (unlikely(!smc->clcsock->ops->setsockopt)) 2582 rc = -EOPNOTSUPP; 2583 else 2584 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2585 optval, optlen); 2586 if (smc->clcsock->sk->sk_err) { 2587 sk->sk_err = smc->clcsock->sk->sk_err; 2588 sk_error_report(sk); 2589 } 2590 mutex_unlock(&smc->clcsock_release_lock); 2591 2592 if (optlen < sizeof(int)) 2593 return -EINVAL; 2594 if (copy_from_sockptr(&val, optval, sizeof(int))) 2595 return -EFAULT; 2596 2597 lock_sock(sk); 2598 if (rc || smc->use_fallback) 2599 goto out; 2600 switch (optname) { 2601 case TCP_FASTOPEN: 2602 case TCP_FASTOPEN_CONNECT: 2603 case TCP_FASTOPEN_KEY: 2604 case TCP_FASTOPEN_NO_COOKIE: 2605 /* option not supported by SMC */ 2606 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2607 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2608 } else { 2609 rc = -EINVAL; 2610 } 2611 break; 2612 case TCP_NODELAY: 2613 if (sk->sk_state != SMC_INIT && 2614 sk->sk_state != SMC_LISTEN && 2615 sk->sk_state != SMC_CLOSED) { 2616 if (val) { 2617 SMC_STAT_INC(smc, ndly_cnt); 2618 mod_delayed_work(smc->conn.lgr->tx_wq, 2619 &smc->conn.tx_work, 0); 2620 } 2621 } 2622 break; 2623 case TCP_CORK: 2624 if (sk->sk_state != SMC_INIT && 2625 sk->sk_state != SMC_LISTEN && 2626 sk->sk_state != SMC_CLOSED) { 2627 if (!val) { 2628 SMC_STAT_INC(smc, cork_cnt); 2629 mod_delayed_work(smc->conn.lgr->tx_wq, 2630 &smc->conn.tx_work, 0); 2631 } 2632 } 2633 break; 2634 case TCP_DEFER_ACCEPT: 2635 smc->sockopt_defer_accept = val; 2636 break; 2637 default: 2638 break; 2639 } 2640 out: 2641 release_sock(sk); 2642 2643 return rc; 2644 } 2645 2646 static int smc_getsockopt(struct socket *sock, int level, int optname, 2647 char __user *optval, int __user *optlen) 2648 { 2649 struct smc_sock *smc; 2650 int rc; 2651 2652 smc = smc_sk(sock->sk); 2653 mutex_lock(&smc->clcsock_release_lock); 2654 if (!smc->clcsock) { 2655 mutex_unlock(&smc->clcsock_release_lock); 2656 return -EBADF; 2657 } 2658 /* socket options apply to the CLC socket */ 2659 if (unlikely(!smc->clcsock->ops->getsockopt)) { 2660 mutex_unlock(&smc->clcsock_release_lock); 2661 return -EOPNOTSUPP; 2662 } 2663 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2664 optval, optlen); 2665 mutex_unlock(&smc->clcsock_release_lock); 2666 return rc; 2667 } 2668 2669 static int smc_ioctl(struct socket *sock, unsigned int cmd, 2670 unsigned long arg) 2671 { 2672 union smc_host_cursor cons, urg; 2673 struct smc_connection *conn; 2674 struct smc_sock *smc; 2675 int answ; 2676 2677 smc = smc_sk(sock->sk); 2678 conn = &smc->conn; 2679 lock_sock(&smc->sk); 2680 if (smc->use_fallback) { 2681 if (!smc->clcsock) { 2682 release_sock(&smc->sk); 2683 return -EBADF; 2684 } 2685 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2686 release_sock(&smc->sk); 2687 return answ; 2688 } 2689 switch (cmd) { 2690 case SIOCINQ: /* same as FIONREAD */ 2691 if (smc->sk.sk_state == SMC_LISTEN) { 2692 release_sock(&smc->sk); 2693 return -EINVAL; 2694 } 2695 if (smc->sk.sk_state == SMC_INIT || 2696 smc->sk.sk_state == SMC_CLOSED) 2697 answ = 0; 2698 else 2699 answ = atomic_read(&smc->conn.bytes_to_rcv); 2700 break; 2701 case SIOCOUTQ: 2702 /* output queue size (not send + not acked) */ 2703 if (smc->sk.sk_state == SMC_LISTEN) { 2704 release_sock(&smc->sk); 2705 return -EINVAL; 2706 } 2707 if (smc->sk.sk_state == SMC_INIT || 2708 smc->sk.sk_state == SMC_CLOSED) 2709 answ = 0; 2710 else 2711 answ = smc->conn.sndbuf_desc->len - 2712 atomic_read(&smc->conn.sndbuf_space); 2713 break; 2714 case SIOCOUTQNSD: 2715 /* output queue size (not send only) */ 2716 if (smc->sk.sk_state == SMC_LISTEN) { 2717 release_sock(&smc->sk); 2718 return -EINVAL; 2719 } 2720 if (smc->sk.sk_state == SMC_INIT || 2721 smc->sk.sk_state == SMC_CLOSED) 2722 answ = 0; 2723 else 2724 answ = smc_tx_prepared_sends(&smc->conn); 2725 break; 2726 case SIOCATMARK: 2727 if (smc->sk.sk_state == SMC_LISTEN) { 2728 release_sock(&smc->sk); 2729 return -EINVAL; 2730 } 2731 if (smc->sk.sk_state == SMC_INIT || 2732 smc->sk.sk_state == SMC_CLOSED) { 2733 answ = 0; 2734 } else { 2735 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2736 smc_curs_copy(&urg, &conn->urg_curs, conn); 2737 answ = smc_curs_diff(conn->rmb_desc->len, 2738 &cons, &urg) == 1; 2739 } 2740 break; 2741 default: 2742 release_sock(&smc->sk); 2743 return -ENOIOCTLCMD; 2744 } 2745 release_sock(&smc->sk); 2746 2747 return put_user(answ, (int __user *)arg); 2748 } 2749 2750 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2751 int offset, size_t size, int flags) 2752 { 2753 struct sock *sk = sock->sk; 2754 struct smc_sock *smc; 2755 int rc = -EPIPE; 2756 2757 smc = smc_sk(sk); 2758 lock_sock(sk); 2759 if (sk->sk_state != SMC_ACTIVE) { 2760 release_sock(sk); 2761 goto out; 2762 } 2763 release_sock(sk); 2764 if (smc->use_fallback) { 2765 rc = kernel_sendpage(smc->clcsock, page, offset, 2766 size, flags); 2767 } else { 2768 SMC_STAT_INC(smc, sendpage_cnt); 2769 rc = sock_no_sendpage(sock, page, offset, size, flags); 2770 } 2771 2772 out: 2773 return rc; 2774 } 2775 2776 /* Map the affected portions of the rmbe into an spd, note the number of bytes 2777 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2778 * updates till whenever a respective page has been fully processed. 2779 * Note that subsequent recv() calls have to wait till all splice() processing 2780 * completed. 2781 */ 2782 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2783 struct pipe_inode_info *pipe, size_t len, 2784 unsigned int flags) 2785 { 2786 struct sock *sk = sock->sk; 2787 struct smc_sock *smc; 2788 int rc = -ENOTCONN; 2789 2790 smc = smc_sk(sk); 2791 lock_sock(sk); 2792 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2793 /* socket was connected before, no more data to read */ 2794 rc = 0; 2795 goto out; 2796 } 2797 if (sk->sk_state == SMC_INIT || 2798 sk->sk_state == SMC_LISTEN || 2799 sk->sk_state == SMC_CLOSED) 2800 goto out; 2801 2802 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2803 rc = 0; 2804 goto out; 2805 } 2806 2807 if (smc->use_fallback) { 2808 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2809 pipe, len, flags); 2810 } else { 2811 if (*ppos) { 2812 rc = -ESPIPE; 2813 goto out; 2814 } 2815 if (flags & SPLICE_F_NONBLOCK) 2816 flags = MSG_DONTWAIT; 2817 else 2818 flags = 0; 2819 SMC_STAT_INC(smc, splice_cnt); 2820 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2821 } 2822 out: 2823 release_sock(sk); 2824 2825 return rc; 2826 } 2827 2828 /* must look like tcp */ 2829 static const struct proto_ops smc_sock_ops = { 2830 .family = PF_SMC, 2831 .owner = THIS_MODULE, 2832 .release = smc_release, 2833 .bind = smc_bind, 2834 .connect = smc_connect, 2835 .socketpair = sock_no_socketpair, 2836 .accept = smc_accept, 2837 .getname = smc_getname, 2838 .poll = smc_poll, 2839 .ioctl = smc_ioctl, 2840 .listen = smc_listen, 2841 .shutdown = smc_shutdown, 2842 .setsockopt = smc_setsockopt, 2843 .getsockopt = smc_getsockopt, 2844 .sendmsg = smc_sendmsg, 2845 .recvmsg = smc_recvmsg, 2846 .mmap = sock_no_mmap, 2847 .sendpage = smc_sendpage, 2848 .splice_read = smc_splice_read, 2849 }; 2850 2851 static int __smc_create(struct net *net, struct socket *sock, int protocol, 2852 int kern, struct socket *clcsock) 2853 { 2854 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2855 struct smc_sock *smc; 2856 struct sock *sk; 2857 int rc; 2858 2859 rc = -ESOCKTNOSUPPORT; 2860 if (sock->type != SOCK_STREAM) 2861 goto out; 2862 2863 rc = -EPROTONOSUPPORT; 2864 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2865 goto out; 2866 2867 rc = -ENOBUFS; 2868 sock->ops = &smc_sock_ops; 2869 sk = smc_sock_alloc(net, sock, protocol); 2870 if (!sk) 2871 goto out; 2872 2873 /* create internal TCP socket for CLC handshake and fallback */ 2874 smc = smc_sk(sk); 2875 smc->use_fallback = false; /* assume rdma capability first */ 2876 smc->fallback_rsn = 0; 2877 2878 rc = 0; 2879 if (!clcsock) { 2880 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2881 &smc->clcsock); 2882 if (rc) { 2883 sk_common_release(sk); 2884 goto out; 2885 } 2886 } else { 2887 smc->clcsock = clcsock; 2888 } 2889 2890 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2891 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2892 2893 out: 2894 return rc; 2895 } 2896 2897 static int smc_create(struct net *net, struct socket *sock, int protocol, 2898 int kern) 2899 { 2900 return __smc_create(net, sock, protocol, kern, NULL); 2901 } 2902 2903 static const struct net_proto_family smc_sock_family_ops = { 2904 .family = PF_SMC, 2905 .owner = THIS_MODULE, 2906 .create = smc_create, 2907 }; 2908 2909 static int smc_ulp_init(struct sock *sk) 2910 { 2911 struct socket *tcp = sk->sk_socket; 2912 struct net *net = sock_net(sk); 2913 struct socket *smcsock; 2914 int protocol, ret; 2915 2916 /* only TCP can be replaced */ 2917 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 2918 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 2919 return -ESOCKTNOSUPPORT; 2920 /* don't handle wq now */ 2921 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 2922 return -ENOTCONN; 2923 2924 if (sk->sk_family == AF_INET) 2925 protocol = SMCPROTO_SMC; 2926 else 2927 protocol = SMCPROTO_SMC6; 2928 2929 smcsock = sock_alloc(); 2930 if (!smcsock) 2931 return -ENFILE; 2932 2933 smcsock->type = SOCK_STREAM; 2934 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 2935 ret = __smc_create(net, smcsock, protocol, 1, tcp); 2936 if (ret) { 2937 sock_release(smcsock); /* module_put() which ops won't be NULL */ 2938 return ret; 2939 } 2940 2941 /* replace tcp socket to smc */ 2942 smcsock->file = tcp->file; 2943 smcsock->file->private_data = smcsock; 2944 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 2945 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 2946 tcp->file = NULL; 2947 2948 return ret; 2949 } 2950 2951 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 2952 const gfp_t priority) 2953 { 2954 struct inet_connection_sock *icsk = inet_csk(newsk); 2955 2956 /* don't inherit ulp ops to child when listen */ 2957 icsk->icsk_ulp_ops = NULL; 2958 } 2959 2960 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 2961 .name = "smc", 2962 .owner = THIS_MODULE, 2963 .init = smc_ulp_init, 2964 .clone = smc_ulp_clone, 2965 }; 2966 2967 unsigned int smc_net_id; 2968 2969 static __net_init int smc_net_init(struct net *net) 2970 { 2971 return smc_pnet_net_init(net); 2972 } 2973 2974 static void __net_exit smc_net_exit(struct net *net) 2975 { 2976 smc_pnet_net_exit(net); 2977 } 2978 2979 static __net_init int smc_net_stat_init(struct net *net) 2980 { 2981 return smc_stats_init(net); 2982 } 2983 2984 static void __net_exit smc_net_stat_exit(struct net *net) 2985 { 2986 smc_stats_exit(net); 2987 } 2988 2989 static struct pernet_operations smc_net_ops = { 2990 .init = smc_net_init, 2991 .exit = smc_net_exit, 2992 .id = &smc_net_id, 2993 .size = sizeof(struct smc_net), 2994 }; 2995 2996 static struct pernet_operations smc_net_stat_ops = { 2997 .init = smc_net_stat_init, 2998 .exit = smc_net_stat_exit, 2999 }; 3000 3001 static int __init smc_init(void) 3002 { 3003 int rc; 3004 3005 rc = register_pernet_subsys(&smc_net_ops); 3006 if (rc) 3007 return rc; 3008 3009 rc = register_pernet_subsys(&smc_net_stat_ops); 3010 if (rc) 3011 return rc; 3012 3013 smc_ism_init(); 3014 smc_clc_init(); 3015 3016 rc = smc_nl_init(); 3017 if (rc) 3018 goto out_pernet_subsys; 3019 3020 rc = smc_pnet_init(); 3021 if (rc) 3022 goto out_nl; 3023 3024 rc = -ENOMEM; 3025 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 3026 if (!smc_hs_wq) 3027 goto out_pnet; 3028 3029 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 3030 if (!smc_close_wq) 3031 goto out_alloc_hs_wq; 3032 3033 rc = smc_core_init(); 3034 if (rc) { 3035 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 3036 goto out_alloc_wqs; 3037 } 3038 3039 rc = smc_llc_init(); 3040 if (rc) { 3041 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 3042 goto out_core; 3043 } 3044 3045 rc = smc_cdc_init(); 3046 if (rc) { 3047 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 3048 goto out_core; 3049 } 3050 3051 rc = proto_register(&smc_proto, 1); 3052 if (rc) { 3053 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 3054 goto out_core; 3055 } 3056 3057 rc = proto_register(&smc_proto6, 1); 3058 if (rc) { 3059 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 3060 goto out_proto; 3061 } 3062 3063 rc = sock_register(&smc_sock_family_ops); 3064 if (rc) { 3065 pr_err("%s: sock_register fails with %d\n", __func__, rc); 3066 goto out_proto6; 3067 } 3068 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 3069 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 3070 3071 rc = smc_ib_register_client(); 3072 if (rc) { 3073 pr_err("%s: ib_register fails with %d\n", __func__, rc); 3074 goto out_sock; 3075 } 3076 3077 rc = tcp_register_ulp(&smc_ulp_ops); 3078 if (rc) { 3079 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 3080 goto out_sock; 3081 } 3082 3083 static_branch_enable(&tcp_have_smc); 3084 return 0; 3085 3086 out_sock: 3087 sock_unregister(PF_SMC); 3088 out_proto6: 3089 proto_unregister(&smc_proto6); 3090 out_proto: 3091 proto_unregister(&smc_proto); 3092 out_core: 3093 smc_core_exit(); 3094 out_alloc_wqs: 3095 destroy_workqueue(smc_close_wq); 3096 out_alloc_hs_wq: 3097 destroy_workqueue(smc_hs_wq); 3098 out_pnet: 3099 smc_pnet_exit(); 3100 out_nl: 3101 smc_nl_exit(); 3102 out_pernet_subsys: 3103 unregister_pernet_subsys(&smc_net_ops); 3104 3105 return rc; 3106 } 3107 3108 static void __exit smc_exit(void) 3109 { 3110 static_branch_disable(&tcp_have_smc); 3111 tcp_unregister_ulp(&smc_ulp_ops); 3112 sock_unregister(PF_SMC); 3113 smc_core_exit(); 3114 smc_ib_unregister_client(); 3115 destroy_workqueue(smc_close_wq); 3116 destroy_workqueue(smc_hs_wq); 3117 proto_unregister(&smc_proto6); 3118 proto_unregister(&smc_proto); 3119 smc_pnet_exit(); 3120 smc_nl_exit(); 3121 smc_clc_exit(); 3122 unregister_pernet_subsys(&smc_net_stat_ops); 3123 unregister_pernet_subsys(&smc_net_ops); 3124 rcu_barrier(); 3125 } 3126 3127 module_init(smc_init); 3128 module_exit(smc_exit); 3129 3130 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3131 MODULE_DESCRIPTION("smc socket address family"); 3132 MODULE_LICENSE("GPL"); 3133 MODULE_ALIAS_NETPROTO(PF_SMC); 3134 MODULE_ALIAS_TCP_ULP("smc"); 3135