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 int rc = 0; 671 672 mutex_lock(&smc->clcsock_release_lock); 673 if (!smc->clcsock) { 674 rc = -EBADF; 675 goto out; 676 } 677 clcsk = smc->clcsock->sk; 678 679 if (smc->use_fallback) 680 goto out; 681 smc->use_fallback = true; 682 smc->fallback_rsn = reason_code; 683 smc_stat_fallback(smc); 684 trace_smc_switch_to_fallback(smc, reason_code); 685 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 686 smc->clcsock->file = smc->sk.sk_socket->file; 687 smc->clcsock->file->private_data = smc->clcsock; 688 smc->clcsock->wq.fasync_list = 689 smc->sk.sk_socket->wq.fasync_list; 690 691 /* There might be some wait entries remaining 692 * in smc sk->sk_wq and they should be woken up 693 * as clcsock's wait queue is woken up. 694 */ 695 smc->clcsk_state_change = clcsk->sk_state_change; 696 smc->clcsk_data_ready = clcsk->sk_data_ready; 697 smc->clcsk_write_space = clcsk->sk_write_space; 698 smc->clcsk_error_report = clcsk->sk_error_report; 699 700 clcsk->sk_state_change = smc_fback_state_change; 701 clcsk->sk_data_ready = smc_fback_data_ready; 702 clcsk->sk_write_space = smc_fback_write_space; 703 clcsk->sk_error_report = smc_fback_error_report; 704 705 smc->clcsock->sk->sk_user_data = 706 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 707 } 708 out: 709 mutex_unlock(&smc->clcsock_release_lock); 710 return rc; 711 } 712 713 /* fall back during connect */ 714 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 715 { 716 struct net *net = sock_net(&smc->sk); 717 int rc = 0; 718 719 rc = smc_switch_to_fallback(smc, reason_code); 720 if (rc) { /* fallback fails */ 721 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 722 if (smc->sk.sk_state == SMC_INIT) 723 sock_put(&smc->sk); /* passive closing */ 724 return rc; 725 } 726 smc_copy_sock_settings_to_clc(smc); 727 smc->connect_nonblock = 0; 728 if (smc->sk.sk_state == SMC_INIT) 729 smc->sk.sk_state = SMC_ACTIVE; 730 return 0; 731 } 732 733 /* decline and fall back during connect */ 734 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 735 u8 version) 736 { 737 struct net *net = sock_net(&smc->sk); 738 int rc; 739 740 if (reason_code < 0) { /* error, fallback is not possible */ 741 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 742 if (smc->sk.sk_state == SMC_INIT) 743 sock_put(&smc->sk); /* passive closing */ 744 return reason_code; 745 } 746 if (reason_code != SMC_CLC_DECL_PEERDECL) { 747 rc = smc_clc_send_decline(smc, reason_code, version); 748 if (rc < 0) { 749 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 750 if (smc->sk.sk_state == SMC_INIT) 751 sock_put(&smc->sk); /* passive closing */ 752 return rc; 753 } 754 } 755 return smc_connect_fallback(smc, reason_code); 756 } 757 758 static void smc_conn_abort(struct smc_sock *smc, int local_first) 759 { 760 struct smc_connection *conn = &smc->conn; 761 struct smc_link_group *lgr = conn->lgr; 762 bool lgr_valid = false; 763 764 if (smc_conn_lgr_valid(conn)) 765 lgr_valid = true; 766 767 smc_conn_free(conn); 768 if (local_first && lgr_valid) 769 smc_lgr_cleanup_early(lgr); 770 } 771 772 /* check if there is a rdma device available for this connection. */ 773 /* called for connect and listen */ 774 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 775 { 776 /* PNET table look up: search active ib_device and port 777 * within same PNETID that also contains the ethernet device 778 * used for the internal TCP socket 779 */ 780 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 781 if (!ini->check_smcrv2 && !ini->ib_dev) 782 return SMC_CLC_DECL_NOSMCRDEV; 783 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) 784 return SMC_CLC_DECL_NOSMCRDEV; 785 return 0; 786 } 787 788 /* check if there is an ISM device available for this connection. */ 789 /* called for connect and listen */ 790 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 791 { 792 /* Find ISM device with same PNETID as connecting interface */ 793 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 794 if (!ini->ism_dev[0]) 795 return SMC_CLC_DECL_NOSMCDDEV; 796 else 797 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 798 return 0; 799 } 800 801 /* is chid unique for the ism devices that are already determined? */ 802 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 803 int cnt) 804 { 805 int i = (!ini->ism_dev[0]) ? 1 : 0; 806 807 for (; i < cnt; i++) 808 if (ini->ism_chid[i] == chid) 809 return false; 810 return true; 811 } 812 813 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus 814 * PNETID matching net_device) 815 */ 816 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 817 struct smc_init_info *ini) 818 { 819 int rc = SMC_CLC_DECL_NOSMCDDEV; 820 struct smcd_dev *smcd; 821 int i = 1; 822 u16 chid; 823 824 if (smcd_indicated(ini->smc_type_v1)) 825 rc = 0; /* already initialized for V1 */ 826 mutex_lock(&smcd_dev_list.mutex); 827 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 828 if (smcd->going_away || smcd == ini->ism_dev[0]) 829 continue; 830 chid = smc_ism_get_chid(smcd); 831 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 832 continue; 833 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 834 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 835 ini->ism_dev[i] = smcd; 836 ini->ism_chid[i] = chid; 837 ini->is_smcd = true; 838 rc = 0; 839 i++; 840 if (i > SMC_MAX_ISM_DEVS) 841 break; 842 } 843 } 844 mutex_unlock(&smcd_dev_list.mutex); 845 ini->ism_offered_cnt = i - 1; 846 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 847 ini->smcd_version = 0; 848 849 return rc; 850 } 851 852 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 853 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 854 struct smc_init_info *ini) 855 { 856 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 857 return SMC_CLC_DECL_ISMVLANERR; 858 return 0; 859 } 860 861 static int smc_find_proposal_devices(struct smc_sock *smc, 862 struct smc_init_info *ini) 863 { 864 int rc = 0; 865 866 /* check if there is an ism device available */ 867 if (!(ini->smcd_version & SMC_V1) || 868 smc_find_ism_device(smc, ini) || 869 smc_connect_ism_vlan_setup(smc, ini)) 870 ini->smcd_version &= ~SMC_V1; 871 /* else ISM V1 is supported for this connection */ 872 873 /* check if there is an rdma device available */ 874 if (!(ini->smcr_version & SMC_V1) || 875 smc_find_rdma_device(smc, ini)) 876 ini->smcr_version &= ~SMC_V1; 877 /* else RDMA is supported for this connection */ 878 879 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 880 ini->smcr_version & SMC_V1); 881 882 /* check if there is an ism v2 device available */ 883 if (!(ini->smcd_version & SMC_V2) || 884 !smc_ism_is_v2_capable() || 885 smc_find_ism_v2_device_clnt(smc, ini)) 886 ini->smcd_version &= ~SMC_V2; 887 888 /* check if there is an rdma v2 device available */ 889 ini->check_smcrv2 = true; 890 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 891 if (!(ini->smcr_version & SMC_V2) || 892 smc->clcsock->sk->sk_family != AF_INET || 893 !smc_clc_ueid_count() || 894 smc_find_rdma_device(smc, ini)) 895 ini->smcr_version &= ~SMC_V2; 896 ini->check_smcrv2 = false; 897 898 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 899 ini->smcr_version & SMC_V2); 900 901 /* if neither ISM nor RDMA are supported, fallback */ 902 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 903 rc = SMC_CLC_DECL_NOSMCDEV; 904 905 return rc; 906 } 907 908 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 909 * used, the VLAN ID will be registered again during the connection setup. 910 */ 911 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 912 struct smc_init_info *ini) 913 { 914 if (!smcd_indicated(ini->smc_type_v1)) 915 return 0; 916 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 917 return SMC_CLC_DECL_CNFERR; 918 return 0; 919 } 920 921 #define SMC_CLC_MAX_ACCEPT_LEN \ 922 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \ 923 sizeof(struct smc_clc_first_contact_ext) + \ 924 sizeof(struct smc_clc_msg_trail)) 925 926 /* CLC handshake during connect */ 927 static int smc_connect_clc(struct smc_sock *smc, 928 struct smc_clc_msg_accept_confirm_v2 *aclc2, 929 struct smc_init_info *ini) 930 { 931 int rc = 0; 932 933 /* do inband token exchange */ 934 rc = smc_clc_send_proposal(smc, ini); 935 if (rc) 936 return rc; 937 /* receive SMC Accept CLC message */ 938 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, 939 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 940 } 941 942 void smc_fill_gid_list(struct smc_link_group *lgr, 943 struct smc_gidlist *gidlist, 944 struct smc_ib_device *known_dev, u8 *known_gid) 945 { 946 struct smc_init_info *alt_ini = NULL; 947 948 memset(gidlist, 0, sizeof(*gidlist)); 949 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 950 951 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 952 if (!alt_ini) 953 goto out; 954 955 alt_ini->vlan_id = lgr->vlan_id; 956 alt_ini->check_smcrv2 = true; 957 alt_ini->smcrv2.saddr = lgr->saddr; 958 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 959 960 if (!alt_ini->smcrv2.ib_dev_v2) 961 goto out; 962 963 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 964 SMC_GID_SIZE); 965 966 out: 967 kfree(alt_ini); 968 } 969 970 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 971 struct smc_clc_msg_accept_confirm *aclc, 972 struct smc_init_info *ini) 973 { 974 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 975 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 976 struct smc_clc_first_contact_ext *fce = 977 (struct smc_clc_first_contact_ext *) 978 (((u8 *)clc_v2) + sizeof(*clc_v2)); 979 980 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 981 return 0; 982 983 if (fce->v2_direct) { 984 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 985 ini->smcrv2.uses_gateway = false; 986 } else { 987 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr, 988 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 989 ini->smcrv2.nexthop_mac, 990 &ini->smcrv2.uses_gateway)) 991 return SMC_CLC_DECL_NOROUTE; 992 if (!ini->smcrv2.uses_gateway) { 993 /* mismatch: peer claims indirect, but its direct */ 994 return SMC_CLC_DECL_NOINDIRECT; 995 } 996 } 997 return 0; 998 } 999 1000 /* setup for RDMA connection of client */ 1001 static int smc_connect_rdma(struct smc_sock *smc, 1002 struct smc_clc_msg_accept_confirm *aclc, 1003 struct smc_init_info *ini) 1004 { 1005 int i, reason_code = 0; 1006 struct smc_link *link; 1007 u8 *eid = NULL; 1008 1009 ini->is_smcd = false; 1010 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 1011 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1012 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 1013 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 1014 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 1015 1016 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 1017 if (reason_code) 1018 return reason_code; 1019 1020 mutex_lock(&smc_client_lgr_pending); 1021 reason_code = smc_conn_create(smc, ini); 1022 if (reason_code) { 1023 mutex_unlock(&smc_client_lgr_pending); 1024 return reason_code; 1025 } 1026 1027 smc_conn_save_peer_info(smc, aclc); 1028 1029 if (ini->first_contact_local) { 1030 link = smc->conn.lnk; 1031 } else { 1032 /* set link that was assigned by server */ 1033 link = NULL; 1034 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1035 struct smc_link *l = &smc->conn.lgr->lnk[i]; 1036 1037 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 1038 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 1039 SMC_GID_SIZE) && 1040 (aclc->hdr.version > SMC_V1 || 1041 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 1042 sizeof(l->peer_mac)))) { 1043 link = l; 1044 break; 1045 } 1046 } 1047 if (!link) { 1048 reason_code = SMC_CLC_DECL_NOSRVLINK; 1049 goto connect_abort; 1050 } 1051 smc_switch_link_and_count(&smc->conn, link); 1052 } 1053 1054 /* create send buffer and rmb */ 1055 if (smc_buf_create(smc, false)) { 1056 reason_code = SMC_CLC_DECL_MEM; 1057 goto connect_abort; 1058 } 1059 1060 if (ini->first_contact_local) 1061 smc_link_save_peer_info(link, aclc, ini); 1062 1063 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 1064 reason_code = SMC_CLC_DECL_ERR_RTOK; 1065 goto connect_abort; 1066 } 1067 1068 smc_close_init(smc); 1069 smc_rx_init(smc); 1070 1071 if (ini->first_contact_local) { 1072 if (smc_ib_ready_link(link)) { 1073 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1074 goto connect_abort; 1075 } 1076 } else { 1077 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 1078 reason_code = SMC_CLC_DECL_ERR_REGRMB; 1079 goto connect_abort; 1080 } 1081 } 1082 smc_rmb_sync_sg_for_device(&smc->conn); 1083 1084 if (aclc->hdr.version > SMC_V1) { 1085 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1086 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1087 1088 eid = clc_v2->r1.eid; 1089 if (ini->first_contact_local) 1090 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 1091 link->smcibdev, link->gid); 1092 } 1093 1094 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 1095 aclc->hdr.version, eid, ini); 1096 if (reason_code) 1097 goto connect_abort; 1098 1099 smc_tx_init(smc); 1100 1101 if (ini->first_contact_local) { 1102 /* QP confirmation over RoCE fabric */ 1103 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1104 reason_code = smcr_clnt_conf_first_link(smc); 1105 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1106 if (reason_code) 1107 goto connect_abort; 1108 } 1109 mutex_unlock(&smc_client_lgr_pending); 1110 1111 smc_copy_sock_settings_to_clc(smc); 1112 smc->connect_nonblock = 0; 1113 if (smc->sk.sk_state == SMC_INIT) 1114 smc->sk.sk_state = SMC_ACTIVE; 1115 1116 return 0; 1117 connect_abort: 1118 smc_conn_abort(smc, ini->first_contact_local); 1119 mutex_unlock(&smc_client_lgr_pending); 1120 smc->connect_nonblock = 0; 1121 1122 return reason_code; 1123 } 1124 1125 /* The server has chosen one of the proposed ISM devices for the communication. 1126 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1127 */ 1128 static int 1129 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 1130 struct smc_init_info *ini) 1131 { 1132 int i; 1133 1134 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1135 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1136 ini->ism_selected = i; 1137 return 0; 1138 } 1139 } 1140 1141 return -EPROTO; 1142 } 1143 1144 /* setup for ISM connection of client */ 1145 static int smc_connect_ism(struct smc_sock *smc, 1146 struct smc_clc_msg_accept_confirm *aclc, 1147 struct smc_init_info *ini) 1148 { 1149 u8 *eid = NULL; 1150 int rc = 0; 1151 1152 ini->is_smcd = true; 1153 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1154 1155 if (aclc->hdr.version == SMC_V2) { 1156 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 1157 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1158 1159 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 1160 if (rc) 1161 return rc; 1162 } 1163 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 1164 1165 /* there is only one lgr role for SMC-D; use server lock */ 1166 mutex_lock(&smc_server_lgr_pending); 1167 rc = smc_conn_create(smc, ini); 1168 if (rc) { 1169 mutex_unlock(&smc_server_lgr_pending); 1170 return rc; 1171 } 1172 1173 /* Create send and receive buffers */ 1174 rc = smc_buf_create(smc, true); 1175 if (rc) { 1176 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1177 goto connect_abort; 1178 } 1179 1180 smc_conn_save_peer_info(smc, aclc); 1181 smc_close_init(smc); 1182 smc_rx_init(smc); 1183 smc_tx_init(smc); 1184 1185 if (aclc->hdr.version > SMC_V1) { 1186 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1187 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1188 1189 eid = clc_v2->d1.eid; 1190 } 1191 1192 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1193 aclc->hdr.version, eid, NULL); 1194 if (rc) 1195 goto connect_abort; 1196 mutex_unlock(&smc_server_lgr_pending); 1197 1198 smc_copy_sock_settings_to_clc(smc); 1199 smc->connect_nonblock = 0; 1200 if (smc->sk.sk_state == SMC_INIT) 1201 smc->sk.sk_state = SMC_ACTIVE; 1202 1203 return 0; 1204 connect_abort: 1205 smc_conn_abort(smc, ini->first_contact_local); 1206 mutex_unlock(&smc_server_lgr_pending); 1207 smc->connect_nonblock = 0; 1208 1209 return rc; 1210 } 1211 1212 /* check if received accept type and version matches a proposed one */ 1213 static int smc_connect_check_aclc(struct smc_init_info *ini, 1214 struct smc_clc_msg_accept_confirm *aclc) 1215 { 1216 if (aclc->hdr.typev1 != SMC_TYPE_R && 1217 aclc->hdr.typev1 != SMC_TYPE_D) 1218 return SMC_CLC_DECL_MODEUNSUPP; 1219 1220 if (aclc->hdr.version >= SMC_V2) { 1221 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1222 !smcr_indicated(ini->smc_type_v2)) || 1223 (aclc->hdr.typev1 == SMC_TYPE_D && 1224 !smcd_indicated(ini->smc_type_v2))) 1225 return SMC_CLC_DECL_MODEUNSUPP; 1226 } else { 1227 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1228 !smcr_indicated(ini->smc_type_v1)) || 1229 (aclc->hdr.typev1 == SMC_TYPE_D && 1230 !smcd_indicated(ini->smc_type_v1))) 1231 return SMC_CLC_DECL_MODEUNSUPP; 1232 } 1233 1234 return 0; 1235 } 1236 1237 /* perform steps before actually connecting */ 1238 static int __smc_connect(struct smc_sock *smc) 1239 { 1240 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1241 struct smc_clc_msg_accept_confirm_v2 *aclc2; 1242 struct smc_clc_msg_accept_confirm *aclc; 1243 struct smc_init_info *ini = NULL; 1244 u8 *buf = NULL; 1245 int rc = 0; 1246 1247 if (smc->use_fallback) 1248 return smc_connect_fallback(smc, smc->fallback_rsn); 1249 1250 /* if peer has not signalled SMC-capability, fall back */ 1251 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1252 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1253 1254 /* IPSec connections opt out of SMC optimizations */ 1255 if (using_ipsec(smc)) 1256 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1257 version); 1258 1259 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1260 if (!ini) 1261 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1262 version); 1263 1264 ini->smcd_version = SMC_V1 | SMC_V2; 1265 ini->smcr_version = SMC_V1 | SMC_V2; 1266 ini->smc_type_v1 = SMC_TYPE_B; 1267 ini->smc_type_v2 = SMC_TYPE_B; 1268 1269 /* get vlan id from IP device */ 1270 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1271 ini->smcd_version &= ~SMC_V1; 1272 ini->smcr_version = 0; 1273 ini->smc_type_v1 = SMC_TYPE_N; 1274 if (!ini->smcd_version) { 1275 rc = SMC_CLC_DECL_GETVLANERR; 1276 goto fallback; 1277 } 1278 } 1279 1280 rc = smc_find_proposal_devices(smc, ini); 1281 if (rc) 1282 goto fallback; 1283 1284 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1285 if (!buf) { 1286 rc = SMC_CLC_DECL_MEM; 1287 goto fallback; 1288 } 1289 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1290 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1291 1292 /* perform CLC handshake */ 1293 rc = smc_connect_clc(smc, aclc2, ini); 1294 if (rc) 1295 goto vlan_cleanup; 1296 1297 /* check if smc modes and versions of CLC proposal and accept match */ 1298 rc = smc_connect_check_aclc(ini, aclc); 1299 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1300 if (rc) 1301 goto vlan_cleanup; 1302 1303 /* depending on previous steps, connect using rdma or ism */ 1304 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1305 ini->smcr_version = version; 1306 rc = smc_connect_rdma(smc, aclc, ini); 1307 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1308 ini->smcd_version = version; 1309 rc = smc_connect_ism(smc, aclc, ini); 1310 } 1311 if (rc) 1312 goto vlan_cleanup; 1313 1314 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1315 smc_connect_ism_vlan_cleanup(smc, ini); 1316 kfree(buf); 1317 kfree(ini); 1318 return 0; 1319 1320 vlan_cleanup: 1321 smc_connect_ism_vlan_cleanup(smc, ini); 1322 kfree(buf); 1323 fallback: 1324 kfree(ini); 1325 return smc_connect_decline_fallback(smc, rc, version); 1326 } 1327 1328 static void smc_connect_work(struct work_struct *work) 1329 { 1330 struct smc_sock *smc = container_of(work, struct smc_sock, 1331 connect_work); 1332 long timeo = smc->sk.sk_sndtimeo; 1333 int rc = 0; 1334 1335 if (!timeo) 1336 timeo = MAX_SCHEDULE_TIMEOUT; 1337 lock_sock(smc->clcsock->sk); 1338 if (smc->clcsock->sk->sk_err) { 1339 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1340 } else if ((1 << smc->clcsock->sk->sk_state) & 1341 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1342 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1343 if ((rc == -EPIPE) && 1344 ((1 << smc->clcsock->sk->sk_state) & 1345 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1346 rc = 0; 1347 } 1348 release_sock(smc->clcsock->sk); 1349 lock_sock(&smc->sk); 1350 if (rc != 0 || smc->sk.sk_err) { 1351 smc->sk.sk_state = SMC_CLOSED; 1352 if (rc == -EPIPE || rc == -EAGAIN) 1353 smc->sk.sk_err = EPIPE; 1354 else if (signal_pending(current)) 1355 smc->sk.sk_err = -sock_intr_errno(timeo); 1356 sock_put(&smc->sk); /* passive closing */ 1357 goto out; 1358 } 1359 1360 rc = __smc_connect(smc); 1361 if (rc < 0) 1362 smc->sk.sk_err = -rc; 1363 1364 out: 1365 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1366 if (smc->sk.sk_err) { 1367 smc->sk.sk_state_change(&smc->sk); 1368 } else { /* allow polling before and after fallback decision */ 1369 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1370 smc->sk.sk_write_space(&smc->sk); 1371 } 1372 } 1373 release_sock(&smc->sk); 1374 } 1375 1376 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1377 int alen, int flags) 1378 { 1379 struct sock *sk = sock->sk; 1380 struct smc_sock *smc; 1381 int rc = -EINVAL; 1382 1383 smc = smc_sk(sk); 1384 1385 /* separate smc parameter checking to be safe */ 1386 if (alen < sizeof(addr->sa_family)) 1387 goto out_err; 1388 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1389 goto out_err; 1390 1391 lock_sock(sk); 1392 switch (sk->sk_state) { 1393 default: 1394 goto out; 1395 case SMC_ACTIVE: 1396 rc = -EISCONN; 1397 goto out; 1398 case SMC_INIT: 1399 break; 1400 } 1401 1402 smc_copy_sock_settings_to_clc(smc); 1403 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1404 if (smc->connect_nonblock) { 1405 rc = -EALREADY; 1406 goto out; 1407 } 1408 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1409 if (rc && rc != -EINPROGRESS) 1410 goto out; 1411 1412 sock_hold(&smc->sk); /* sock put in passive closing */ 1413 if (smc->use_fallback) 1414 goto out; 1415 if (flags & O_NONBLOCK) { 1416 if (queue_work(smc_hs_wq, &smc->connect_work)) 1417 smc->connect_nonblock = 1; 1418 rc = -EINPROGRESS; 1419 } else { 1420 rc = __smc_connect(smc); 1421 if (rc < 0) 1422 goto out; 1423 else 1424 rc = 0; /* success cases including fallback */ 1425 } 1426 1427 out: 1428 release_sock(sk); 1429 out_err: 1430 return rc; 1431 } 1432 1433 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1434 { 1435 struct socket *new_clcsock = NULL; 1436 struct sock *lsk = &lsmc->sk; 1437 struct sock *new_sk; 1438 int rc = -EINVAL; 1439 1440 release_sock(lsk); 1441 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1442 if (!new_sk) { 1443 rc = -ENOMEM; 1444 lsk->sk_err = ENOMEM; 1445 *new_smc = NULL; 1446 lock_sock(lsk); 1447 goto out; 1448 } 1449 *new_smc = smc_sk(new_sk); 1450 1451 mutex_lock(&lsmc->clcsock_release_lock); 1452 if (lsmc->clcsock) 1453 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1454 mutex_unlock(&lsmc->clcsock_release_lock); 1455 lock_sock(lsk); 1456 if (rc < 0 && rc != -EAGAIN) 1457 lsk->sk_err = -rc; 1458 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1459 new_sk->sk_prot->unhash(new_sk); 1460 if (new_clcsock) 1461 sock_release(new_clcsock); 1462 new_sk->sk_state = SMC_CLOSED; 1463 sock_set_flag(new_sk, SOCK_DEAD); 1464 sock_put(new_sk); /* final */ 1465 *new_smc = NULL; 1466 goto out; 1467 } 1468 1469 /* new clcsock has inherited the smc listen-specific sk_data_ready 1470 * function; switch it back to the original sk_data_ready function 1471 */ 1472 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1473 (*new_smc)->clcsock = new_clcsock; 1474 out: 1475 return rc; 1476 } 1477 1478 /* add a just created sock to the accept queue of the listen sock as 1479 * candidate for a following socket accept call from user space 1480 */ 1481 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1482 { 1483 struct smc_sock *par = smc_sk(parent); 1484 1485 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1486 spin_lock(&par->accept_q_lock); 1487 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1488 spin_unlock(&par->accept_q_lock); 1489 sk_acceptq_added(parent); 1490 } 1491 1492 /* remove a socket from the accept queue of its parental listening socket */ 1493 static void smc_accept_unlink(struct sock *sk) 1494 { 1495 struct smc_sock *par = smc_sk(sk)->listen_smc; 1496 1497 spin_lock(&par->accept_q_lock); 1498 list_del_init(&smc_sk(sk)->accept_q); 1499 spin_unlock(&par->accept_q_lock); 1500 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1501 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1502 } 1503 1504 /* remove a sock from the accept queue to bind it to a new socket created 1505 * for a socket accept call from user space 1506 */ 1507 struct sock *smc_accept_dequeue(struct sock *parent, 1508 struct socket *new_sock) 1509 { 1510 struct smc_sock *isk, *n; 1511 struct sock *new_sk; 1512 1513 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1514 new_sk = (struct sock *)isk; 1515 1516 smc_accept_unlink(new_sk); 1517 if (new_sk->sk_state == SMC_CLOSED) { 1518 new_sk->sk_prot->unhash(new_sk); 1519 if (isk->clcsock) { 1520 sock_release(isk->clcsock); 1521 isk->clcsock = NULL; 1522 } 1523 sock_put(new_sk); /* final */ 1524 continue; 1525 } 1526 if (new_sock) { 1527 sock_graft(new_sk, new_sock); 1528 if (isk->use_fallback) { 1529 smc_sk(new_sk)->clcsock->file = new_sock->file; 1530 isk->clcsock->file->private_data = isk->clcsock; 1531 } 1532 } 1533 return new_sk; 1534 } 1535 return NULL; 1536 } 1537 1538 /* clean up for a created but never accepted sock */ 1539 void smc_close_non_accepted(struct sock *sk) 1540 { 1541 struct smc_sock *smc = smc_sk(sk); 1542 1543 sock_hold(sk); /* sock_put below */ 1544 lock_sock(sk); 1545 if (!sk->sk_lingertime) 1546 /* wait for peer closing */ 1547 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1548 __smc_release(smc); 1549 release_sock(sk); 1550 sock_put(sk); /* sock_hold above */ 1551 sock_put(sk); /* final sock_put */ 1552 } 1553 1554 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1555 { 1556 struct smc_link *link = smc->conn.lnk; 1557 struct smc_llc_qentry *qentry; 1558 int rc; 1559 1560 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1561 return SMC_CLC_DECL_ERR_REGRMB; 1562 1563 /* send CONFIRM LINK request to client over the RoCE fabric */ 1564 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1565 if (rc < 0) 1566 return SMC_CLC_DECL_TIMEOUT_CL; 1567 1568 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1569 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1570 SMC_LLC_CONFIRM_LINK); 1571 if (!qentry) { 1572 struct smc_clc_msg_decline dclc; 1573 1574 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1575 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1576 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1577 } 1578 smc_llc_save_peer_uid(qentry); 1579 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1580 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1581 if (rc) 1582 return SMC_CLC_DECL_RMBE_EC; 1583 1584 /* confirm_rkey is implicit on 1st contact */ 1585 smc->conn.rmb_desc->is_conf_rkey = true; 1586 1587 smc_llc_link_active(link); 1588 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1589 1590 /* initial contact - try to establish second link */ 1591 smc_llc_srv_add_link(link, NULL); 1592 return 0; 1593 } 1594 1595 /* listen worker: finish */ 1596 static void smc_listen_out(struct smc_sock *new_smc) 1597 { 1598 struct smc_sock *lsmc = new_smc->listen_smc; 1599 struct sock *newsmcsk = &new_smc->sk; 1600 1601 if (lsmc->sk.sk_state == SMC_LISTEN) { 1602 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1603 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1604 release_sock(&lsmc->sk); 1605 } else { /* no longer listening */ 1606 smc_close_non_accepted(newsmcsk); 1607 } 1608 1609 /* Wake up accept */ 1610 lsmc->sk.sk_data_ready(&lsmc->sk); 1611 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1612 } 1613 1614 /* listen worker: finish in state connected */ 1615 static void smc_listen_out_connected(struct smc_sock *new_smc) 1616 { 1617 struct sock *newsmcsk = &new_smc->sk; 1618 1619 sk_refcnt_debug_inc(newsmcsk); 1620 if (newsmcsk->sk_state == SMC_INIT) 1621 newsmcsk->sk_state = SMC_ACTIVE; 1622 1623 smc_listen_out(new_smc); 1624 } 1625 1626 /* listen worker: finish in error state */ 1627 static void smc_listen_out_err(struct smc_sock *new_smc) 1628 { 1629 struct sock *newsmcsk = &new_smc->sk; 1630 struct net *net = sock_net(newsmcsk); 1631 1632 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1633 if (newsmcsk->sk_state == SMC_INIT) 1634 sock_put(&new_smc->sk); /* passive closing */ 1635 newsmcsk->sk_state = SMC_CLOSED; 1636 1637 smc_listen_out(new_smc); 1638 } 1639 1640 /* listen worker: decline and fall back if possible */ 1641 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1642 int local_first, u8 version) 1643 { 1644 /* RDMA setup failed, switch back to TCP */ 1645 smc_conn_abort(new_smc, local_first); 1646 if (reason_code < 0 || 1647 smc_switch_to_fallback(new_smc, reason_code)) { 1648 /* error, no fallback possible */ 1649 smc_listen_out_err(new_smc); 1650 return; 1651 } 1652 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1653 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1654 smc_listen_out_err(new_smc); 1655 return; 1656 } 1657 } 1658 smc_listen_out_connected(new_smc); 1659 } 1660 1661 /* listen worker: version checking */ 1662 static int smc_listen_v2_check(struct smc_sock *new_smc, 1663 struct smc_clc_msg_proposal *pclc, 1664 struct smc_init_info *ini) 1665 { 1666 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1667 struct smc_clc_v2_extension *pclc_v2_ext; 1668 int rc = SMC_CLC_DECL_PEERNOSMC; 1669 1670 ini->smc_type_v1 = pclc->hdr.typev1; 1671 ini->smc_type_v2 = pclc->hdr.typev2; 1672 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1673 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1674 if (pclc->hdr.version > SMC_V1) { 1675 if (smcd_indicated(ini->smc_type_v2)) 1676 ini->smcd_version |= SMC_V2; 1677 if (smcr_indicated(ini->smc_type_v2)) 1678 ini->smcr_version |= SMC_V2; 1679 } 1680 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 1681 rc = SMC_CLC_DECL_PEERNOSMC; 1682 goto out; 1683 } 1684 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1685 if (!pclc_v2_ext) { 1686 ini->smcd_version &= ~SMC_V2; 1687 ini->smcr_version &= ~SMC_V2; 1688 rc = SMC_CLC_DECL_NOV2EXT; 1689 goto out; 1690 } 1691 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1692 if (ini->smcd_version & SMC_V2) { 1693 if (!smc_ism_is_v2_capable()) { 1694 ini->smcd_version &= ~SMC_V2; 1695 rc = SMC_CLC_DECL_NOISM2SUPP; 1696 } else if (!pclc_smcd_v2_ext) { 1697 ini->smcd_version &= ~SMC_V2; 1698 rc = SMC_CLC_DECL_NOV2DEXT; 1699 } else if (!pclc_v2_ext->hdr.eid_cnt && 1700 !pclc_v2_ext->hdr.flag.seid) { 1701 ini->smcd_version &= ~SMC_V2; 1702 rc = SMC_CLC_DECL_NOUEID; 1703 } 1704 } 1705 if (ini->smcr_version & SMC_V2) { 1706 if (!pclc_v2_ext->hdr.eid_cnt) { 1707 ini->smcr_version &= ~SMC_V2; 1708 rc = SMC_CLC_DECL_NOUEID; 1709 } 1710 } 1711 1712 out: 1713 if (!ini->smcd_version && !ini->smcr_version) 1714 return rc; 1715 1716 return 0; 1717 } 1718 1719 /* listen worker: check prefixes */ 1720 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1721 struct smc_clc_msg_proposal *pclc) 1722 { 1723 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1724 struct socket *newclcsock = new_smc->clcsock; 1725 1726 if (pclc->hdr.typev1 == SMC_TYPE_N) 1727 return 0; 1728 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1729 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1730 return SMC_CLC_DECL_DIFFPREFIX; 1731 1732 return 0; 1733 } 1734 1735 /* listen worker: initialize connection and buffers */ 1736 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1737 struct smc_init_info *ini) 1738 { 1739 int rc; 1740 1741 /* allocate connection / link group */ 1742 rc = smc_conn_create(new_smc, ini); 1743 if (rc) 1744 return rc; 1745 1746 /* create send buffer and rmb */ 1747 if (smc_buf_create(new_smc, false)) 1748 return SMC_CLC_DECL_MEM; 1749 1750 return 0; 1751 } 1752 1753 /* listen worker: initialize connection and buffers for SMC-D */ 1754 static int smc_listen_ism_init(struct smc_sock *new_smc, 1755 struct smc_init_info *ini) 1756 { 1757 int rc; 1758 1759 rc = smc_conn_create(new_smc, ini); 1760 if (rc) 1761 return rc; 1762 1763 /* Create send and receive buffers */ 1764 rc = smc_buf_create(new_smc, true); 1765 if (rc) { 1766 smc_conn_abort(new_smc, ini->first_contact_local); 1767 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1768 SMC_CLC_DECL_MEM; 1769 } 1770 1771 return 0; 1772 } 1773 1774 static bool smc_is_already_selected(struct smcd_dev *smcd, 1775 struct smc_init_info *ini, 1776 int matches) 1777 { 1778 int i; 1779 1780 for (i = 0; i < matches; i++) 1781 if (smcd == ini->ism_dev[i]) 1782 return true; 1783 1784 return false; 1785 } 1786 1787 /* check for ISM devices matching proposed ISM devices */ 1788 static void smc_check_ism_v2_match(struct smc_init_info *ini, 1789 u16 proposed_chid, u64 proposed_gid, 1790 unsigned int *matches) 1791 { 1792 struct smcd_dev *smcd; 1793 1794 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1795 if (smcd->going_away) 1796 continue; 1797 if (smc_is_already_selected(smcd, ini, *matches)) 1798 continue; 1799 if (smc_ism_get_chid(smcd) == proposed_chid && 1800 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1801 ini->ism_peer_gid[*matches] = proposed_gid; 1802 ini->ism_dev[*matches] = smcd; 1803 (*matches)++; 1804 break; 1805 } 1806 } 1807 } 1808 1809 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 1810 { 1811 if (!ini->rc) 1812 ini->rc = rc; 1813 } 1814 1815 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1816 struct smc_clc_msg_proposal *pclc, 1817 struct smc_init_info *ini) 1818 { 1819 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1820 struct smc_clc_v2_extension *smc_v2_ext; 1821 struct smc_clc_msg_smcd *pclc_smcd; 1822 unsigned int matches = 0; 1823 u8 smcd_version; 1824 u8 *eid = NULL; 1825 int i, rc; 1826 1827 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1828 goto not_found; 1829 1830 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1831 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1832 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1833 1834 mutex_lock(&smcd_dev_list.mutex); 1835 if (pclc_smcd->ism.chid) 1836 /* check for ISM device matching proposed native ISM device */ 1837 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1838 ntohll(pclc_smcd->ism.gid), &matches); 1839 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1840 /* check for ISM devices matching proposed non-native ISM 1841 * devices 1842 */ 1843 smc_check_ism_v2_match(ini, 1844 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1845 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1846 &matches); 1847 } 1848 mutex_unlock(&smcd_dev_list.mutex); 1849 1850 if (!ini->ism_dev[0]) { 1851 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 1852 goto not_found; 1853 } 1854 1855 smc_ism_get_system_eid(&eid); 1856 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 1857 smcd_v2_ext->system_eid, eid)) 1858 goto not_found; 1859 1860 /* separate - outside the smcd_dev_list.lock */ 1861 smcd_version = ini->smcd_version; 1862 for (i = 0; i < matches; i++) { 1863 ini->smcd_version = SMC_V2; 1864 ini->is_smcd = true; 1865 ini->ism_selected = i; 1866 rc = smc_listen_ism_init(new_smc, ini); 1867 if (rc) { 1868 smc_find_ism_store_rc(rc, ini); 1869 /* try next active ISM device */ 1870 continue; 1871 } 1872 return; /* matching and usable V2 ISM device found */ 1873 } 1874 /* no V2 ISM device could be initialized */ 1875 ini->smcd_version = smcd_version; /* restore original value */ 1876 ini->negotiated_eid[0] = 0; 1877 1878 not_found: 1879 ini->smcd_version &= ~SMC_V2; 1880 ini->ism_dev[0] = NULL; 1881 ini->is_smcd = false; 1882 } 1883 1884 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1885 struct smc_clc_msg_proposal *pclc, 1886 struct smc_init_info *ini) 1887 { 1888 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1889 int rc = 0; 1890 1891 /* check if ISM V1 is available */ 1892 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1893 goto not_found; 1894 ini->is_smcd = true; /* prepare ISM check */ 1895 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1896 rc = smc_find_ism_device(new_smc, ini); 1897 if (rc) 1898 goto not_found; 1899 ini->ism_selected = 0; 1900 rc = smc_listen_ism_init(new_smc, ini); 1901 if (!rc) 1902 return; /* V1 ISM device found */ 1903 1904 not_found: 1905 smc_find_ism_store_rc(rc, ini); 1906 ini->smcd_version &= ~SMC_V1; 1907 ini->ism_dev[0] = NULL; 1908 ini->is_smcd = false; 1909 } 1910 1911 /* listen worker: register buffers */ 1912 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1913 { 1914 struct smc_connection *conn = &new_smc->conn; 1915 1916 if (!local_first) { 1917 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1918 return SMC_CLC_DECL_ERR_REGRMB; 1919 } 1920 smc_rmb_sync_sg_for_device(&new_smc->conn); 1921 1922 return 0; 1923 } 1924 1925 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 1926 struct smc_clc_msg_proposal *pclc, 1927 struct smc_init_info *ini) 1928 { 1929 struct smc_clc_v2_extension *smc_v2_ext; 1930 u8 smcr_version; 1931 int rc; 1932 1933 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 1934 goto not_found; 1935 1936 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1937 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 1938 goto not_found; 1939 1940 /* prepare RDMA check */ 1941 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1942 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 1943 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1944 ini->check_smcrv2 = true; 1945 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 1946 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 1947 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 1948 rc = smc_find_rdma_device(new_smc, ini); 1949 if (rc) { 1950 smc_find_ism_store_rc(rc, ini); 1951 goto not_found; 1952 } 1953 if (!ini->smcrv2.uses_gateway) 1954 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 1955 1956 smcr_version = ini->smcr_version; 1957 ini->smcr_version = SMC_V2; 1958 rc = smc_listen_rdma_init(new_smc, ini); 1959 if (!rc) 1960 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1961 if (!rc) 1962 return; 1963 ini->smcr_version = smcr_version; 1964 smc_find_ism_store_rc(rc, ini); 1965 1966 not_found: 1967 ini->smcr_version &= ~SMC_V2; 1968 ini->check_smcrv2 = false; 1969 } 1970 1971 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1972 struct smc_clc_msg_proposal *pclc, 1973 struct smc_init_info *ini) 1974 { 1975 int rc; 1976 1977 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 1978 return SMC_CLC_DECL_NOSMCDEV; 1979 1980 /* prepare RDMA check */ 1981 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1982 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 1983 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1984 rc = smc_find_rdma_device(new_smc, ini); 1985 if (rc) { 1986 /* no RDMA device found */ 1987 return SMC_CLC_DECL_NOSMCDEV; 1988 } 1989 rc = smc_listen_rdma_init(new_smc, ini); 1990 if (rc) 1991 return rc; 1992 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1993 } 1994 1995 /* determine the local device matching to proposal */ 1996 static int smc_listen_find_device(struct smc_sock *new_smc, 1997 struct smc_clc_msg_proposal *pclc, 1998 struct smc_init_info *ini) 1999 { 2000 int prfx_rc; 2001 2002 /* check for ISM device matching V2 proposed device */ 2003 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 2004 if (ini->ism_dev[0]) 2005 return 0; 2006 2007 /* check for matching IP prefix and subnet length (V1) */ 2008 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 2009 if (prfx_rc) 2010 smc_find_ism_store_rc(prfx_rc, ini); 2011 2012 /* get vlan id from IP device */ 2013 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 2014 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 2015 2016 /* check for ISM device matching V1 proposed device */ 2017 if (!prfx_rc) 2018 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 2019 if (ini->ism_dev[0]) 2020 return 0; 2021 2022 if (!smcr_indicated(pclc->hdr.typev1) && 2023 !smcr_indicated(pclc->hdr.typev2)) 2024 /* skip RDMA and decline */ 2025 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 2026 2027 /* check if RDMA V2 is available */ 2028 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 2029 if (ini->smcrv2.ib_dev_v2) 2030 return 0; 2031 2032 /* check if RDMA V1 is available */ 2033 if (!prfx_rc) { 2034 int rc; 2035 2036 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 2037 smc_find_ism_store_rc(rc, ini); 2038 return (!rc) ? 0 : ini->rc; 2039 } 2040 return SMC_CLC_DECL_NOSMCDEV; 2041 } 2042 2043 /* listen worker: finish RDMA setup */ 2044 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 2045 struct smc_clc_msg_accept_confirm *cclc, 2046 bool local_first, 2047 struct smc_init_info *ini) 2048 { 2049 struct smc_link *link = new_smc->conn.lnk; 2050 int reason_code = 0; 2051 2052 if (local_first) 2053 smc_link_save_peer_info(link, cclc, ini); 2054 2055 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 2056 return SMC_CLC_DECL_ERR_RTOK; 2057 2058 if (local_first) { 2059 if (smc_ib_ready_link(link)) 2060 return SMC_CLC_DECL_ERR_RDYLNK; 2061 /* QP confirmation over RoCE fabric */ 2062 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 2063 reason_code = smcr_serv_conf_first_link(new_smc); 2064 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 2065 } 2066 return reason_code; 2067 } 2068 2069 /* setup for connection of server */ 2070 static void smc_listen_work(struct work_struct *work) 2071 { 2072 struct smc_sock *new_smc = container_of(work, struct smc_sock, 2073 smc_listen_work); 2074 struct socket *newclcsock = new_smc->clcsock; 2075 struct smc_clc_msg_accept_confirm *cclc; 2076 struct smc_clc_msg_proposal_area *buf; 2077 struct smc_clc_msg_proposal *pclc; 2078 struct smc_init_info *ini = NULL; 2079 u8 proposal_version = SMC_V1; 2080 u8 accept_version; 2081 int rc = 0; 2082 2083 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 2084 return smc_listen_out_err(new_smc); 2085 2086 if (new_smc->use_fallback) { 2087 smc_listen_out_connected(new_smc); 2088 return; 2089 } 2090 2091 /* check if peer is smc capable */ 2092 if (!tcp_sk(newclcsock->sk)->syn_smc) { 2093 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 2094 if (rc) 2095 smc_listen_out_err(new_smc); 2096 else 2097 smc_listen_out_connected(new_smc); 2098 return; 2099 } 2100 2101 /* do inband token exchange - 2102 * wait for and receive SMC Proposal CLC message 2103 */ 2104 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 2105 if (!buf) { 2106 rc = SMC_CLC_DECL_MEM; 2107 goto out_decl; 2108 } 2109 pclc = (struct smc_clc_msg_proposal *)buf; 2110 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2111 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2112 if (rc) 2113 goto out_decl; 2114 2115 if (pclc->hdr.version > SMC_V1) 2116 proposal_version = SMC_V2; 2117 2118 /* IPSec connections opt out of SMC optimizations */ 2119 if (using_ipsec(new_smc)) { 2120 rc = SMC_CLC_DECL_IPSEC; 2121 goto out_decl; 2122 } 2123 2124 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2125 if (!ini) { 2126 rc = SMC_CLC_DECL_MEM; 2127 goto out_decl; 2128 } 2129 2130 /* initial version checking */ 2131 rc = smc_listen_v2_check(new_smc, pclc, ini); 2132 if (rc) 2133 goto out_decl; 2134 2135 mutex_lock(&smc_server_lgr_pending); 2136 smc_close_init(new_smc); 2137 smc_rx_init(new_smc); 2138 smc_tx_init(new_smc); 2139 2140 /* determine ISM or RoCE device used for connection */ 2141 rc = smc_listen_find_device(new_smc, pclc, ini); 2142 if (rc) 2143 goto out_unlock; 2144 2145 /* send SMC Accept CLC message */ 2146 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2147 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2148 accept_version, ini->negotiated_eid); 2149 if (rc) 2150 goto out_unlock; 2151 2152 /* SMC-D does not need this lock any more */ 2153 if (ini->is_smcd) 2154 mutex_unlock(&smc_server_lgr_pending); 2155 2156 /* receive SMC Confirm CLC message */ 2157 memset(buf, 0, sizeof(*buf)); 2158 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2159 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2160 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2161 if (rc) { 2162 if (!ini->is_smcd) 2163 goto out_unlock; 2164 goto out_decl; 2165 } 2166 2167 /* finish worker */ 2168 if (!ini->is_smcd) { 2169 rc = smc_listen_rdma_finish(new_smc, cclc, 2170 ini->first_contact_local, ini); 2171 if (rc) 2172 goto out_unlock; 2173 mutex_unlock(&smc_server_lgr_pending); 2174 } 2175 smc_conn_save_peer_info(new_smc, cclc); 2176 smc_listen_out_connected(new_smc); 2177 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2178 goto out_free; 2179 2180 out_unlock: 2181 mutex_unlock(&smc_server_lgr_pending); 2182 out_decl: 2183 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2184 proposal_version); 2185 out_free: 2186 kfree(ini); 2187 kfree(buf); 2188 } 2189 2190 static void smc_tcp_listen_work(struct work_struct *work) 2191 { 2192 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2193 tcp_listen_work); 2194 struct sock *lsk = &lsmc->sk; 2195 struct smc_sock *new_smc; 2196 int rc = 0; 2197 2198 lock_sock(lsk); 2199 while (lsk->sk_state == SMC_LISTEN) { 2200 rc = smc_clcsock_accept(lsmc, &new_smc); 2201 if (rc) /* clcsock accept queue empty or error */ 2202 goto out; 2203 if (!new_smc) 2204 continue; 2205 2206 new_smc->listen_smc = lsmc; 2207 new_smc->use_fallback = lsmc->use_fallback; 2208 new_smc->fallback_rsn = lsmc->fallback_rsn; 2209 sock_hold(lsk); /* sock_put in smc_listen_work */ 2210 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2211 smc_copy_sock_settings_to_smc(new_smc); 2212 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 2213 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 2214 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2215 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2216 sock_put(&new_smc->sk); 2217 } 2218 2219 out: 2220 release_sock(lsk); 2221 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2222 } 2223 2224 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2225 { 2226 struct smc_sock *lsmc = 2227 smc_clcsock_user_data(listen_clcsock); 2228 2229 if (!lsmc) 2230 return; 2231 lsmc->clcsk_data_ready(listen_clcsock); 2232 if (lsmc->sk.sk_state == SMC_LISTEN) { 2233 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2234 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 2235 sock_put(&lsmc->sk); 2236 } 2237 } 2238 2239 static int smc_listen(struct socket *sock, int backlog) 2240 { 2241 struct sock *sk = sock->sk; 2242 struct smc_sock *smc; 2243 int rc; 2244 2245 smc = smc_sk(sk); 2246 lock_sock(sk); 2247 2248 rc = -EINVAL; 2249 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2250 smc->connect_nonblock) 2251 goto out; 2252 2253 rc = 0; 2254 if (sk->sk_state == SMC_LISTEN) { 2255 sk->sk_max_ack_backlog = backlog; 2256 goto out; 2257 } 2258 /* some socket options are handled in core, so we could not apply 2259 * them to the clc socket -- copy smc socket options to clc socket 2260 */ 2261 smc_copy_sock_settings_to_clc(smc); 2262 if (!smc->use_fallback) 2263 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2264 2265 /* save original sk_data_ready function and establish 2266 * smc-specific sk_data_ready function 2267 */ 2268 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 2269 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 2270 smc->clcsock->sk->sk_user_data = 2271 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2272 rc = kernel_listen(smc->clcsock, backlog); 2273 if (rc) { 2274 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready; 2275 goto out; 2276 } 2277 sk->sk_max_ack_backlog = backlog; 2278 sk->sk_ack_backlog = 0; 2279 sk->sk_state = SMC_LISTEN; 2280 2281 out: 2282 release_sock(sk); 2283 return rc; 2284 } 2285 2286 static int smc_accept(struct socket *sock, struct socket *new_sock, 2287 int flags, bool kern) 2288 { 2289 struct sock *sk = sock->sk, *nsk; 2290 DECLARE_WAITQUEUE(wait, current); 2291 struct smc_sock *lsmc; 2292 long timeo; 2293 int rc = 0; 2294 2295 lsmc = smc_sk(sk); 2296 sock_hold(sk); /* sock_put below */ 2297 lock_sock(sk); 2298 2299 if (lsmc->sk.sk_state != SMC_LISTEN) { 2300 rc = -EINVAL; 2301 release_sock(sk); 2302 goto out; 2303 } 2304 2305 /* Wait for an incoming connection */ 2306 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2307 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2308 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2309 set_current_state(TASK_INTERRUPTIBLE); 2310 if (!timeo) { 2311 rc = -EAGAIN; 2312 break; 2313 } 2314 release_sock(sk); 2315 timeo = schedule_timeout(timeo); 2316 /* wakeup by sk_data_ready in smc_listen_work() */ 2317 sched_annotate_sleep(); 2318 lock_sock(sk); 2319 if (signal_pending(current)) { 2320 rc = sock_intr_errno(timeo); 2321 break; 2322 } 2323 } 2324 set_current_state(TASK_RUNNING); 2325 remove_wait_queue(sk_sleep(sk), &wait); 2326 2327 if (!rc) 2328 rc = sock_error(nsk); 2329 release_sock(sk); 2330 if (rc) 2331 goto out; 2332 2333 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 2334 /* wait till data arrives on the socket */ 2335 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 2336 MSEC_PER_SEC); 2337 if (smc_sk(nsk)->use_fallback) { 2338 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2339 2340 lock_sock(clcsk); 2341 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2342 sk_wait_data(clcsk, &timeo, NULL); 2343 release_sock(clcsk); 2344 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2345 lock_sock(nsk); 2346 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 2347 release_sock(nsk); 2348 } 2349 } 2350 2351 out: 2352 sock_put(sk); /* sock_hold above */ 2353 return rc; 2354 } 2355 2356 static int smc_getname(struct socket *sock, struct sockaddr *addr, 2357 int peer) 2358 { 2359 struct smc_sock *smc; 2360 2361 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2362 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2363 return -ENOTCONN; 2364 2365 smc = smc_sk(sock->sk); 2366 2367 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2368 } 2369 2370 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2371 { 2372 struct sock *sk = sock->sk; 2373 struct smc_sock *smc; 2374 int rc = -EPIPE; 2375 2376 smc = smc_sk(sk); 2377 lock_sock(sk); 2378 if ((sk->sk_state != SMC_ACTIVE) && 2379 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2380 (sk->sk_state != SMC_INIT)) 2381 goto out; 2382 2383 if (msg->msg_flags & MSG_FASTOPEN) { 2384 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2385 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2386 if (rc) 2387 goto out; 2388 } else { 2389 rc = -EINVAL; 2390 goto out; 2391 } 2392 } 2393 2394 if (smc->use_fallback) { 2395 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2396 } else { 2397 rc = smc_tx_sendmsg(smc, msg, len); 2398 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2399 } 2400 out: 2401 release_sock(sk); 2402 return rc; 2403 } 2404 2405 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2406 int flags) 2407 { 2408 struct sock *sk = sock->sk; 2409 struct smc_sock *smc; 2410 int rc = -ENOTCONN; 2411 2412 smc = smc_sk(sk); 2413 lock_sock(sk); 2414 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2415 /* socket was connected before, no more data to read */ 2416 rc = 0; 2417 goto out; 2418 } 2419 if ((sk->sk_state == SMC_INIT) || 2420 (sk->sk_state == SMC_LISTEN) || 2421 (sk->sk_state == SMC_CLOSED)) 2422 goto out; 2423 2424 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2425 rc = 0; 2426 goto out; 2427 } 2428 2429 if (smc->use_fallback) { 2430 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2431 } else { 2432 msg->msg_namelen = 0; 2433 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2434 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2435 } 2436 2437 out: 2438 release_sock(sk); 2439 return rc; 2440 } 2441 2442 static __poll_t smc_accept_poll(struct sock *parent) 2443 { 2444 struct smc_sock *isk = smc_sk(parent); 2445 __poll_t mask = 0; 2446 2447 spin_lock(&isk->accept_q_lock); 2448 if (!list_empty(&isk->accept_q)) 2449 mask = EPOLLIN | EPOLLRDNORM; 2450 spin_unlock(&isk->accept_q_lock); 2451 2452 return mask; 2453 } 2454 2455 static __poll_t smc_poll(struct file *file, struct socket *sock, 2456 poll_table *wait) 2457 { 2458 struct sock *sk = sock->sk; 2459 struct smc_sock *smc; 2460 __poll_t mask = 0; 2461 2462 if (!sk) 2463 return EPOLLNVAL; 2464 2465 smc = smc_sk(sock->sk); 2466 if (smc->use_fallback) { 2467 /* delegate to CLC child sock */ 2468 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2469 sk->sk_err = smc->clcsock->sk->sk_err; 2470 } else { 2471 if (sk->sk_state != SMC_CLOSED) 2472 sock_poll_wait(file, sock, wait); 2473 if (sk->sk_err) 2474 mask |= EPOLLERR; 2475 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2476 (sk->sk_state == SMC_CLOSED)) 2477 mask |= EPOLLHUP; 2478 if (sk->sk_state == SMC_LISTEN) { 2479 /* woken up by sk_data_ready in smc_listen_work() */ 2480 mask |= smc_accept_poll(sk); 2481 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2482 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2483 wait); 2484 sk->sk_err = smc->clcsock->sk->sk_err; 2485 } else { 2486 if ((sk->sk_state != SMC_INIT && 2487 atomic_read(&smc->conn.sndbuf_space)) || 2488 sk->sk_shutdown & SEND_SHUTDOWN) { 2489 mask |= EPOLLOUT | EPOLLWRNORM; 2490 } else { 2491 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2492 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2493 } 2494 if (atomic_read(&smc->conn.bytes_to_rcv)) 2495 mask |= EPOLLIN | EPOLLRDNORM; 2496 if (sk->sk_shutdown & RCV_SHUTDOWN) 2497 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2498 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2499 mask |= EPOLLIN; 2500 if (smc->conn.urg_state == SMC_URG_VALID) 2501 mask |= EPOLLPRI; 2502 } 2503 } 2504 2505 return mask; 2506 } 2507 2508 static int smc_shutdown(struct socket *sock, int how) 2509 { 2510 struct sock *sk = sock->sk; 2511 bool do_shutdown = true; 2512 struct smc_sock *smc; 2513 int rc = -EINVAL; 2514 int old_state; 2515 int rc1 = 0; 2516 2517 smc = smc_sk(sk); 2518 2519 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2520 return rc; 2521 2522 lock_sock(sk); 2523 2524 rc = -ENOTCONN; 2525 if ((sk->sk_state != SMC_ACTIVE) && 2526 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2527 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2528 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2529 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2530 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2531 goto out; 2532 if (smc->use_fallback) { 2533 rc = kernel_sock_shutdown(smc->clcsock, how); 2534 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2535 if (sk->sk_shutdown == SHUTDOWN_MASK) 2536 sk->sk_state = SMC_CLOSED; 2537 goto out; 2538 } 2539 switch (how) { 2540 case SHUT_RDWR: /* shutdown in both directions */ 2541 old_state = sk->sk_state; 2542 rc = smc_close_active(smc); 2543 if (old_state == SMC_ACTIVE && 2544 sk->sk_state == SMC_PEERCLOSEWAIT1) 2545 do_shutdown = false; 2546 break; 2547 case SHUT_WR: 2548 rc = smc_close_shutdown_write(smc); 2549 break; 2550 case SHUT_RD: 2551 rc = 0; 2552 /* nothing more to do because peer is not involved */ 2553 break; 2554 } 2555 if (do_shutdown && smc->clcsock) 2556 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2557 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2558 sk->sk_shutdown |= how + 1; 2559 2560 out: 2561 release_sock(sk); 2562 return rc ? rc : rc1; 2563 } 2564 2565 static int smc_setsockopt(struct socket *sock, int level, int optname, 2566 sockptr_t optval, unsigned int optlen) 2567 { 2568 struct sock *sk = sock->sk; 2569 struct smc_sock *smc; 2570 int val, rc; 2571 2572 if (level == SOL_TCP && optname == TCP_ULP) 2573 return -EOPNOTSUPP; 2574 2575 smc = smc_sk(sk); 2576 2577 /* generic setsockopts reaching us here always apply to the 2578 * CLC socket 2579 */ 2580 mutex_lock(&smc->clcsock_release_lock); 2581 if (!smc->clcsock) { 2582 mutex_unlock(&smc->clcsock_release_lock); 2583 return -EBADF; 2584 } 2585 if (unlikely(!smc->clcsock->ops->setsockopt)) 2586 rc = -EOPNOTSUPP; 2587 else 2588 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2589 optval, optlen); 2590 if (smc->clcsock->sk->sk_err) { 2591 sk->sk_err = smc->clcsock->sk->sk_err; 2592 sk_error_report(sk); 2593 } 2594 mutex_unlock(&smc->clcsock_release_lock); 2595 2596 if (optlen < sizeof(int)) 2597 return -EINVAL; 2598 if (copy_from_sockptr(&val, optval, sizeof(int))) 2599 return -EFAULT; 2600 2601 lock_sock(sk); 2602 if (rc || smc->use_fallback) 2603 goto out; 2604 switch (optname) { 2605 case TCP_FASTOPEN: 2606 case TCP_FASTOPEN_CONNECT: 2607 case TCP_FASTOPEN_KEY: 2608 case TCP_FASTOPEN_NO_COOKIE: 2609 /* option not supported by SMC */ 2610 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2611 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2612 } else { 2613 rc = -EINVAL; 2614 } 2615 break; 2616 case TCP_NODELAY: 2617 if (sk->sk_state != SMC_INIT && 2618 sk->sk_state != SMC_LISTEN && 2619 sk->sk_state != SMC_CLOSED) { 2620 if (val) { 2621 SMC_STAT_INC(smc, ndly_cnt); 2622 mod_delayed_work(smc->conn.lgr->tx_wq, 2623 &smc->conn.tx_work, 0); 2624 } 2625 } 2626 break; 2627 case TCP_CORK: 2628 if (sk->sk_state != SMC_INIT && 2629 sk->sk_state != SMC_LISTEN && 2630 sk->sk_state != SMC_CLOSED) { 2631 if (!val) { 2632 SMC_STAT_INC(smc, cork_cnt); 2633 mod_delayed_work(smc->conn.lgr->tx_wq, 2634 &smc->conn.tx_work, 0); 2635 } 2636 } 2637 break; 2638 case TCP_DEFER_ACCEPT: 2639 smc->sockopt_defer_accept = val; 2640 break; 2641 default: 2642 break; 2643 } 2644 out: 2645 release_sock(sk); 2646 2647 return rc; 2648 } 2649 2650 static int smc_getsockopt(struct socket *sock, int level, int optname, 2651 char __user *optval, int __user *optlen) 2652 { 2653 struct smc_sock *smc; 2654 int rc; 2655 2656 smc = smc_sk(sock->sk); 2657 mutex_lock(&smc->clcsock_release_lock); 2658 if (!smc->clcsock) { 2659 mutex_unlock(&smc->clcsock_release_lock); 2660 return -EBADF; 2661 } 2662 /* socket options apply to the CLC socket */ 2663 if (unlikely(!smc->clcsock->ops->getsockopt)) { 2664 mutex_unlock(&smc->clcsock_release_lock); 2665 return -EOPNOTSUPP; 2666 } 2667 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2668 optval, optlen); 2669 mutex_unlock(&smc->clcsock_release_lock); 2670 return rc; 2671 } 2672 2673 static int smc_ioctl(struct socket *sock, unsigned int cmd, 2674 unsigned long arg) 2675 { 2676 union smc_host_cursor cons, urg; 2677 struct smc_connection *conn; 2678 struct smc_sock *smc; 2679 int answ; 2680 2681 smc = smc_sk(sock->sk); 2682 conn = &smc->conn; 2683 lock_sock(&smc->sk); 2684 if (smc->use_fallback) { 2685 if (!smc->clcsock) { 2686 release_sock(&smc->sk); 2687 return -EBADF; 2688 } 2689 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2690 release_sock(&smc->sk); 2691 return answ; 2692 } 2693 switch (cmd) { 2694 case SIOCINQ: /* same as FIONREAD */ 2695 if (smc->sk.sk_state == SMC_LISTEN) { 2696 release_sock(&smc->sk); 2697 return -EINVAL; 2698 } 2699 if (smc->sk.sk_state == SMC_INIT || 2700 smc->sk.sk_state == SMC_CLOSED) 2701 answ = 0; 2702 else 2703 answ = atomic_read(&smc->conn.bytes_to_rcv); 2704 break; 2705 case SIOCOUTQ: 2706 /* output queue size (not send + not acked) */ 2707 if (smc->sk.sk_state == SMC_LISTEN) { 2708 release_sock(&smc->sk); 2709 return -EINVAL; 2710 } 2711 if (smc->sk.sk_state == SMC_INIT || 2712 smc->sk.sk_state == SMC_CLOSED) 2713 answ = 0; 2714 else 2715 answ = smc->conn.sndbuf_desc->len - 2716 atomic_read(&smc->conn.sndbuf_space); 2717 break; 2718 case SIOCOUTQNSD: 2719 /* output queue size (not send only) */ 2720 if (smc->sk.sk_state == SMC_LISTEN) { 2721 release_sock(&smc->sk); 2722 return -EINVAL; 2723 } 2724 if (smc->sk.sk_state == SMC_INIT || 2725 smc->sk.sk_state == SMC_CLOSED) 2726 answ = 0; 2727 else 2728 answ = smc_tx_prepared_sends(&smc->conn); 2729 break; 2730 case SIOCATMARK: 2731 if (smc->sk.sk_state == SMC_LISTEN) { 2732 release_sock(&smc->sk); 2733 return -EINVAL; 2734 } 2735 if (smc->sk.sk_state == SMC_INIT || 2736 smc->sk.sk_state == SMC_CLOSED) { 2737 answ = 0; 2738 } else { 2739 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2740 smc_curs_copy(&urg, &conn->urg_curs, conn); 2741 answ = smc_curs_diff(conn->rmb_desc->len, 2742 &cons, &urg) == 1; 2743 } 2744 break; 2745 default: 2746 release_sock(&smc->sk); 2747 return -ENOIOCTLCMD; 2748 } 2749 release_sock(&smc->sk); 2750 2751 return put_user(answ, (int __user *)arg); 2752 } 2753 2754 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2755 int offset, size_t size, int flags) 2756 { 2757 struct sock *sk = sock->sk; 2758 struct smc_sock *smc; 2759 int rc = -EPIPE; 2760 2761 smc = smc_sk(sk); 2762 lock_sock(sk); 2763 if (sk->sk_state != SMC_ACTIVE) { 2764 release_sock(sk); 2765 goto out; 2766 } 2767 release_sock(sk); 2768 if (smc->use_fallback) { 2769 rc = kernel_sendpage(smc->clcsock, page, offset, 2770 size, flags); 2771 } else { 2772 SMC_STAT_INC(smc, sendpage_cnt); 2773 rc = sock_no_sendpage(sock, page, offset, size, flags); 2774 } 2775 2776 out: 2777 return rc; 2778 } 2779 2780 /* Map the affected portions of the rmbe into an spd, note the number of bytes 2781 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2782 * updates till whenever a respective page has been fully processed. 2783 * Note that subsequent recv() calls have to wait till all splice() processing 2784 * completed. 2785 */ 2786 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2787 struct pipe_inode_info *pipe, size_t len, 2788 unsigned int flags) 2789 { 2790 struct sock *sk = sock->sk; 2791 struct smc_sock *smc; 2792 int rc = -ENOTCONN; 2793 2794 smc = smc_sk(sk); 2795 lock_sock(sk); 2796 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2797 /* socket was connected before, no more data to read */ 2798 rc = 0; 2799 goto out; 2800 } 2801 if (sk->sk_state == SMC_INIT || 2802 sk->sk_state == SMC_LISTEN || 2803 sk->sk_state == SMC_CLOSED) 2804 goto out; 2805 2806 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2807 rc = 0; 2808 goto out; 2809 } 2810 2811 if (smc->use_fallback) { 2812 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2813 pipe, len, flags); 2814 } else { 2815 if (*ppos) { 2816 rc = -ESPIPE; 2817 goto out; 2818 } 2819 if (flags & SPLICE_F_NONBLOCK) 2820 flags = MSG_DONTWAIT; 2821 else 2822 flags = 0; 2823 SMC_STAT_INC(smc, splice_cnt); 2824 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2825 } 2826 out: 2827 release_sock(sk); 2828 2829 return rc; 2830 } 2831 2832 /* must look like tcp */ 2833 static const struct proto_ops smc_sock_ops = { 2834 .family = PF_SMC, 2835 .owner = THIS_MODULE, 2836 .release = smc_release, 2837 .bind = smc_bind, 2838 .connect = smc_connect, 2839 .socketpair = sock_no_socketpair, 2840 .accept = smc_accept, 2841 .getname = smc_getname, 2842 .poll = smc_poll, 2843 .ioctl = smc_ioctl, 2844 .listen = smc_listen, 2845 .shutdown = smc_shutdown, 2846 .setsockopt = smc_setsockopt, 2847 .getsockopt = smc_getsockopt, 2848 .sendmsg = smc_sendmsg, 2849 .recvmsg = smc_recvmsg, 2850 .mmap = sock_no_mmap, 2851 .sendpage = smc_sendpage, 2852 .splice_read = smc_splice_read, 2853 }; 2854 2855 static int __smc_create(struct net *net, struct socket *sock, int protocol, 2856 int kern, struct socket *clcsock) 2857 { 2858 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2859 struct smc_sock *smc; 2860 struct sock *sk; 2861 int rc; 2862 2863 rc = -ESOCKTNOSUPPORT; 2864 if (sock->type != SOCK_STREAM) 2865 goto out; 2866 2867 rc = -EPROTONOSUPPORT; 2868 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2869 goto out; 2870 2871 rc = -ENOBUFS; 2872 sock->ops = &smc_sock_ops; 2873 sk = smc_sock_alloc(net, sock, protocol); 2874 if (!sk) 2875 goto out; 2876 2877 /* create internal TCP socket for CLC handshake and fallback */ 2878 smc = smc_sk(sk); 2879 smc->use_fallback = false; /* assume rdma capability first */ 2880 smc->fallback_rsn = 0; 2881 2882 rc = 0; 2883 if (!clcsock) { 2884 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2885 &smc->clcsock); 2886 if (rc) { 2887 sk_common_release(sk); 2888 goto out; 2889 } 2890 } else { 2891 smc->clcsock = clcsock; 2892 } 2893 2894 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2895 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2896 2897 out: 2898 return rc; 2899 } 2900 2901 static int smc_create(struct net *net, struct socket *sock, int protocol, 2902 int kern) 2903 { 2904 return __smc_create(net, sock, protocol, kern, NULL); 2905 } 2906 2907 static const struct net_proto_family smc_sock_family_ops = { 2908 .family = PF_SMC, 2909 .owner = THIS_MODULE, 2910 .create = smc_create, 2911 }; 2912 2913 static int smc_ulp_init(struct sock *sk) 2914 { 2915 struct socket *tcp = sk->sk_socket; 2916 struct net *net = sock_net(sk); 2917 struct socket *smcsock; 2918 int protocol, ret; 2919 2920 /* only TCP can be replaced */ 2921 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 2922 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 2923 return -ESOCKTNOSUPPORT; 2924 /* don't handle wq now */ 2925 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 2926 return -ENOTCONN; 2927 2928 if (sk->sk_family == AF_INET) 2929 protocol = SMCPROTO_SMC; 2930 else 2931 protocol = SMCPROTO_SMC6; 2932 2933 smcsock = sock_alloc(); 2934 if (!smcsock) 2935 return -ENFILE; 2936 2937 smcsock->type = SOCK_STREAM; 2938 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 2939 ret = __smc_create(net, smcsock, protocol, 1, tcp); 2940 if (ret) { 2941 sock_release(smcsock); /* module_put() which ops won't be NULL */ 2942 return ret; 2943 } 2944 2945 /* replace tcp socket to smc */ 2946 smcsock->file = tcp->file; 2947 smcsock->file->private_data = smcsock; 2948 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 2949 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 2950 tcp->file = NULL; 2951 2952 return ret; 2953 } 2954 2955 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 2956 const gfp_t priority) 2957 { 2958 struct inet_connection_sock *icsk = inet_csk(newsk); 2959 2960 /* don't inherit ulp ops to child when listen */ 2961 icsk->icsk_ulp_ops = NULL; 2962 } 2963 2964 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 2965 .name = "smc", 2966 .owner = THIS_MODULE, 2967 .init = smc_ulp_init, 2968 .clone = smc_ulp_clone, 2969 }; 2970 2971 unsigned int smc_net_id; 2972 2973 static __net_init int smc_net_init(struct net *net) 2974 { 2975 return smc_pnet_net_init(net); 2976 } 2977 2978 static void __net_exit smc_net_exit(struct net *net) 2979 { 2980 smc_pnet_net_exit(net); 2981 } 2982 2983 static __net_init int smc_net_stat_init(struct net *net) 2984 { 2985 return smc_stats_init(net); 2986 } 2987 2988 static void __net_exit smc_net_stat_exit(struct net *net) 2989 { 2990 smc_stats_exit(net); 2991 } 2992 2993 static struct pernet_operations smc_net_ops = { 2994 .init = smc_net_init, 2995 .exit = smc_net_exit, 2996 .id = &smc_net_id, 2997 .size = sizeof(struct smc_net), 2998 }; 2999 3000 static struct pernet_operations smc_net_stat_ops = { 3001 .init = smc_net_stat_init, 3002 .exit = smc_net_stat_exit, 3003 }; 3004 3005 static int __init smc_init(void) 3006 { 3007 int rc; 3008 3009 rc = register_pernet_subsys(&smc_net_ops); 3010 if (rc) 3011 return rc; 3012 3013 rc = register_pernet_subsys(&smc_net_stat_ops); 3014 if (rc) 3015 return rc; 3016 3017 smc_ism_init(); 3018 smc_clc_init(); 3019 3020 rc = smc_nl_init(); 3021 if (rc) 3022 goto out_pernet_subsys; 3023 3024 rc = smc_pnet_init(); 3025 if (rc) 3026 goto out_nl; 3027 3028 rc = -ENOMEM; 3029 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 3030 if (!smc_hs_wq) 3031 goto out_pnet; 3032 3033 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 3034 if (!smc_close_wq) 3035 goto out_alloc_hs_wq; 3036 3037 rc = smc_core_init(); 3038 if (rc) { 3039 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 3040 goto out_alloc_wqs; 3041 } 3042 3043 rc = smc_llc_init(); 3044 if (rc) { 3045 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 3046 goto out_core; 3047 } 3048 3049 rc = smc_cdc_init(); 3050 if (rc) { 3051 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 3052 goto out_core; 3053 } 3054 3055 rc = proto_register(&smc_proto, 1); 3056 if (rc) { 3057 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 3058 goto out_core; 3059 } 3060 3061 rc = proto_register(&smc_proto6, 1); 3062 if (rc) { 3063 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 3064 goto out_proto; 3065 } 3066 3067 rc = sock_register(&smc_sock_family_ops); 3068 if (rc) { 3069 pr_err("%s: sock_register fails with %d\n", __func__, rc); 3070 goto out_proto6; 3071 } 3072 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 3073 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 3074 3075 rc = smc_ib_register_client(); 3076 if (rc) { 3077 pr_err("%s: ib_register fails with %d\n", __func__, rc); 3078 goto out_sock; 3079 } 3080 3081 rc = tcp_register_ulp(&smc_ulp_ops); 3082 if (rc) { 3083 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 3084 goto out_sock; 3085 } 3086 3087 static_branch_enable(&tcp_have_smc); 3088 return 0; 3089 3090 out_sock: 3091 sock_unregister(PF_SMC); 3092 out_proto6: 3093 proto_unregister(&smc_proto6); 3094 out_proto: 3095 proto_unregister(&smc_proto); 3096 out_core: 3097 smc_core_exit(); 3098 out_alloc_wqs: 3099 destroy_workqueue(smc_close_wq); 3100 out_alloc_hs_wq: 3101 destroy_workqueue(smc_hs_wq); 3102 out_pnet: 3103 smc_pnet_exit(); 3104 out_nl: 3105 smc_nl_exit(); 3106 out_pernet_subsys: 3107 unregister_pernet_subsys(&smc_net_ops); 3108 3109 return rc; 3110 } 3111 3112 static void __exit smc_exit(void) 3113 { 3114 static_branch_disable(&tcp_have_smc); 3115 tcp_unregister_ulp(&smc_ulp_ops); 3116 sock_unregister(PF_SMC); 3117 smc_core_exit(); 3118 smc_ib_unregister_client(); 3119 destroy_workqueue(smc_close_wq); 3120 destroy_workqueue(smc_hs_wq); 3121 proto_unregister(&smc_proto6); 3122 proto_unregister(&smc_proto); 3123 smc_pnet_exit(); 3124 smc_nl_exit(); 3125 smc_clc_exit(); 3126 unregister_pernet_subsys(&smc_net_stat_ops); 3127 unregister_pernet_subsys(&smc_net_ops); 3128 rcu_barrier(); 3129 } 3130 3131 module_init(smc_init); 3132 module_exit(smc_exit); 3133 3134 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3135 MODULE_DESCRIPTION("smc socket address family"); 3136 MODULE_LICENSE("GPL"); 3137 MODULE_ALIAS_NETPROTO(PF_SMC); 3138 MODULE_ALIAS_TCP_ULP("smc"); 3139