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 old_state, rc = 0; 187 188 if (!sk) 189 goto out; 190 191 sock_hold(sk); /* sock_put below */ 192 smc = smc_sk(sk); 193 194 old_state = sk->sk_state; 195 196 /* cleanup for a dangling non-blocking connect */ 197 if (smc->connect_nonblock && old_state == SMC_INIT) 198 tcp_abort(smc->clcsock->sk, ECONNABORTED); 199 200 if (cancel_work_sync(&smc->connect_work)) 201 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */ 202 203 if (sk->sk_state == SMC_LISTEN) 204 /* smc_close_non_accepted() is called and acquires 205 * sock lock for child sockets again 206 */ 207 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 208 else 209 lock_sock(sk); 210 211 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE && 212 !smc->use_fallback) 213 smc_close_active_abort(smc); 214 215 rc = __smc_release(smc); 216 217 /* detach socket */ 218 sock_orphan(sk); 219 sock->sk = NULL; 220 release_sock(sk); 221 222 sock_put(sk); /* sock_hold above */ 223 sock_put(sk); /* final sock_put */ 224 out: 225 return rc; 226 } 227 228 static void smc_destruct(struct sock *sk) 229 { 230 if (sk->sk_state != SMC_CLOSED) 231 return; 232 if (!sock_flag(sk, SOCK_DEAD)) 233 return; 234 235 sk_refcnt_debug_dec(sk); 236 } 237 238 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 239 int protocol) 240 { 241 struct smc_sock *smc; 242 struct proto *prot; 243 struct sock *sk; 244 245 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 246 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 247 if (!sk) 248 return NULL; 249 250 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 251 sk->sk_state = SMC_INIT; 252 sk->sk_destruct = smc_destruct; 253 sk->sk_protocol = protocol; 254 smc = smc_sk(sk); 255 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 256 INIT_WORK(&smc->connect_work, smc_connect_work); 257 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 258 INIT_LIST_HEAD(&smc->accept_q); 259 spin_lock_init(&smc->accept_q_lock); 260 spin_lock_init(&smc->conn.send_lock); 261 sk->sk_prot->hash(sk); 262 sk_refcnt_debug_inc(sk); 263 mutex_init(&smc->clcsock_release_lock); 264 265 return sk; 266 } 267 268 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 269 int addr_len) 270 { 271 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 272 struct sock *sk = sock->sk; 273 struct smc_sock *smc; 274 int rc; 275 276 smc = smc_sk(sk); 277 278 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 279 rc = -EINVAL; 280 if (addr_len < sizeof(struct sockaddr_in)) 281 goto out; 282 283 rc = -EAFNOSUPPORT; 284 if (addr->sin_family != AF_INET && 285 addr->sin_family != AF_INET6 && 286 addr->sin_family != AF_UNSPEC) 287 goto out; 288 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 289 if (addr->sin_family == AF_UNSPEC && 290 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 291 goto out; 292 293 lock_sock(sk); 294 295 /* Check if socket is already active */ 296 rc = -EINVAL; 297 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 298 goto out_rel; 299 300 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 301 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 302 303 out_rel: 304 release_sock(sk); 305 out: 306 return rc; 307 } 308 309 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 310 unsigned long mask) 311 { 312 /* options we don't get control via setsockopt for */ 313 nsk->sk_type = osk->sk_type; 314 nsk->sk_sndbuf = osk->sk_sndbuf; 315 nsk->sk_rcvbuf = osk->sk_rcvbuf; 316 nsk->sk_sndtimeo = osk->sk_sndtimeo; 317 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 318 nsk->sk_mark = osk->sk_mark; 319 nsk->sk_priority = osk->sk_priority; 320 nsk->sk_rcvlowat = osk->sk_rcvlowat; 321 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 322 nsk->sk_err = osk->sk_err; 323 324 nsk->sk_flags &= ~mask; 325 nsk->sk_flags |= osk->sk_flags & mask; 326 } 327 328 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 329 (1UL << SOCK_KEEPOPEN) | \ 330 (1UL << SOCK_LINGER) | \ 331 (1UL << SOCK_BROADCAST) | \ 332 (1UL << SOCK_TIMESTAMP) | \ 333 (1UL << SOCK_DBG) | \ 334 (1UL << SOCK_RCVTSTAMP) | \ 335 (1UL << SOCK_RCVTSTAMPNS) | \ 336 (1UL << SOCK_LOCALROUTE) | \ 337 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 338 (1UL << SOCK_RXQ_OVFL) | \ 339 (1UL << SOCK_WIFI_STATUS) | \ 340 (1UL << SOCK_NOFCS) | \ 341 (1UL << SOCK_FILTER_LOCKED) | \ 342 (1UL << SOCK_TSTAMP_NEW)) 343 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 344 * clc socket (since smc is not called for these options from net/core) 345 */ 346 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 347 { 348 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 349 } 350 351 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 352 (1UL << SOCK_KEEPOPEN) | \ 353 (1UL << SOCK_LINGER) | \ 354 (1UL << SOCK_DBG)) 355 /* copy only settings and flags relevant for smc from clc to smc socket */ 356 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 357 { 358 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 359 } 360 361 /* register the new rmb on all links */ 362 static int smcr_lgr_reg_rmbs(struct smc_link *link, 363 struct smc_buf_desc *rmb_desc) 364 { 365 struct smc_link_group *lgr = link->lgr; 366 int i, rc = 0; 367 368 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 369 if (rc) 370 return rc; 371 /* protect against parallel smc_llc_cli_rkey_exchange() and 372 * parallel smcr_link_reg_rmb() 373 */ 374 mutex_lock(&lgr->llc_conf_mutex); 375 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 376 if (!smc_link_active(&lgr->lnk[i])) 377 continue; 378 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc); 379 if (rc) 380 goto out; 381 } 382 383 /* exchange confirm_rkey msg with peer */ 384 rc = smc_llc_do_confirm_rkey(link, rmb_desc); 385 if (rc) { 386 rc = -EFAULT; 387 goto out; 388 } 389 rmb_desc->is_conf_rkey = true; 390 out: 391 mutex_unlock(&lgr->llc_conf_mutex); 392 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 393 return rc; 394 } 395 396 static int smcr_clnt_conf_first_link(struct smc_sock *smc) 397 { 398 struct smc_link *link = smc->conn.lnk; 399 struct smc_llc_qentry *qentry; 400 int rc; 401 402 /* receive CONFIRM LINK request from server over RoCE fabric */ 403 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 404 SMC_LLC_CONFIRM_LINK); 405 if (!qentry) { 406 struct smc_clc_msg_decline dclc; 407 408 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 409 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 410 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 411 } 412 smc_llc_save_peer_uid(qentry); 413 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); 414 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 415 if (rc) 416 return SMC_CLC_DECL_RMBE_EC; 417 418 rc = smc_ib_modify_qp_rts(link); 419 if (rc) 420 return SMC_CLC_DECL_ERR_RDYLNK; 421 422 smc_wr_remember_qp_attr(link); 423 424 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 425 return SMC_CLC_DECL_ERR_REGRMB; 426 427 /* confirm_rkey is implicit on 1st contact */ 428 smc->conn.rmb_desc->is_conf_rkey = true; 429 430 /* send CONFIRM LINK response over RoCE fabric */ 431 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 432 if (rc < 0) 433 return SMC_CLC_DECL_TIMEOUT_CL; 434 435 smc_llc_link_active(link); 436 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 437 438 /* optional 2nd link, receive ADD LINK request from server */ 439 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 440 SMC_LLC_ADD_LINK); 441 if (!qentry) { 442 struct smc_clc_msg_decline dclc; 443 444 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 445 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 446 if (rc == -EAGAIN) 447 rc = 0; /* no DECLINE received, go with one link */ 448 return rc; 449 } 450 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); 451 smc_llc_cli_add_link(link, qentry); 452 return 0; 453 } 454 455 static bool smc_isascii(char *hostname) 456 { 457 int i; 458 459 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) 460 if (!isascii(hostname[i])) 461 return false; 462 return true; 463 } 464 465 static void smc_conn_save_peer_info_fce(struct smc_sock *smc, 466 struct smc_clc_msg_accept_confirm *clc) 467 { 468 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 469 (struct smc_clc_msg_accept_confirm_v2 *)clc; 470 struct smc_clc_first_contact_ext *fce; 471 int clc_v2_len; 472 473 if (clc->hdr.version == SMC_V1 || 474 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 475 return; 476 477 if (smc->conn.lgr->is_smcd) { 478 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid, 479 SMC_MAX_EID_LEN); 480 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 481 d1); 482 } else { 483 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid, 484 SMC_MAX_EID_LEN); 485 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 486 r1); 487 } 488 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len); 489 smc->conn.lgr->peer_os = fce->os_type; 490 smc->conn.lgr->peer_smc_release = fce->release; 491 if (smc_isascii(fce->hostname)) 492 memcpy(smc->conn.lgr->peer_hostname, fce->hostname, 493 SMC_MAX_HOSTNAME_LEN); 494 } 495 496 static void smcr_conn_save_peer_info(struct smc_sock *smc, 497 struct smc_clc_msg_accept_confirm *clc) 498 { 499 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); 500 501 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; 502 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); 503 smc->conn.peer_rmbe_size = bufsize; 504 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 505 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 506 } 507 508 static void smcd_conn_save_peer_info(struct smc_sock *smc, 509 struct smc_clc_msg_accept_confirm *clc) 510 { 511 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); 512 513 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; 514 smc->conn.peer_token = clc->d0.token; 515 /* msg header takes up space in the buffer */ 516 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 517 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 518 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 519 } 520 521 static void smc_conn_save_peer_info(struct smc_sock *smc, 522 struct smc_clc_msg_accept_confirm *clc) 523 { 524 if (smc->conn.lgr->is_smcd) 525 smcd_conn_save_peer_info(smc, clc); 526 else 527 smcr_conn_save_peer_info(smc, clc); 528 smc_conn_save_peer_info_fce(smc, clc); 529 } 530 531 static void smc_link_save_peer_info(struct smc_link *link, 532 struct smc_clc_msg_accept_confirm *clc, 533 struct smc_init_info *ini) 534 { 535 link->peer_qpn = ntoh24(clc->r0.qpn); 536 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE); 537 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac)); 538 link->peer_psn = ntoh24(clc->r0.psn); 539 link->peer_mtu = clc->r0.qp_mtu; 540 } 541 542 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc, 543 struct smc_stats_fback *fback_arr) 544 { 545 int cnt; 546 547 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) { 548 if (fback_arr[cnt].fback_code == smc->fallback_rsn) { 549 fback_arr[cnt].count++; 550 break; 551 } 552 if (!fback_arr[cnt].fback_code) { 553 fback_arr[cnt].fback_code = smc->fallback_rsn; 554 fback_arr[cnt].count++; 555 break; 556 } 557 } 558 } 559 560 static void smc_stat_fallback(struct smc_sock *smc) 561 { 562 struct net *net = sock_net(&smc->sk); 563 564 mutex_lock(&net->smc.mutex_fback_rsn); 565 if (smc->listen_smc) { 566 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv); 567 net->smc.fback_rsn->srv_fback_cnt++; 568 } else { 569 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt); 570 net->smc.fback_rsn->clnt_fback_cnt++; 571 } 572 mutex_unlock(&net->smc.mutex_fback_rsn); 573 } 574 575 /* must be called under rcu read lock */ 576 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key) 577 { 578 struct socket_wq *wq; 579 __poll_t flags; 580 581 wq = rcu_dereference(smc->sk.sk_wq); 582 if (!skwq_has_sleeper(wq)) 583 return; 584 585 /* wake up smc sk->sk_wq */ 586 if (!key) { 587 /* sk_state_change */ 588 wake_up_interruptible_all(&wq->wait); 589 } else { 590 flags = key_to_poll(key); 591 if (flags & (EPOLLIN | EPOLLOUT)) 592 /* sk_data_ready or sk_write_space */ 593 wake_up_interruptible_sync_poll(&wq->wait, flags); 594 else if (flags & EPOLLERR) 595 /* sk_error_report */ 596 wake_up_interruptible_poll(&wq->wait, flags); 597 } 598 } 599 600 static int smc_fback_mark_woken(wait_queue_entry_t *wait, 601 unsigned int mode, int sync, void *key) 602 { 603 struct smc_mark_woken *mark = 604 container_of(wait, struct smc_mark_woken, wait_entry); 605 606 mark->woken = true; 607 mark->key = key; 608 return 0; 609 } 610 611 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk, 612 void (*clcsock_callback)(struct sock *sk)) 613 { 614 struct smc_mark_woken mark = { .woken = false }; 615 struct socket_wq *wq; 616 617 init_waitqueue_func_entry(&mark.wait_entry, 618 smc_fback_mark_woken); 619 rcu_read_lock(); 620 wq = rcu_dereference(clcsk->sk_wq); 621 if (!wq) 622 goto out; 623 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 624 clcsock_callback(clcsk); 625 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 626 627 if (mark.woken) 628 smc_fback_wakeup_waitqueue(smc, mark.key); 629 out: 630 rcu_read_unlock(); 631 } 632 633 static void smc_fback_state_change(struct sock *clcsk) 634 { 635 struct smc_sock *smc = 636 smc_clcsock_user_data(clcsk); 637 638 if (!smc) 639 return; 640 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_state_change); 641 } 642 643 static void smc_fback_data_ready(struct sock *clcsk) 644 { 645 struct smc_sock *smc = 646 smc_clcsock_user_data(clcsk); 647 648 if (!smc) 649 return; 650 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_data_ready); 651 } 652 653 static void smc_fback_write_space(struct sock *clcsk) 654 { 655 struct smc_sock *smc = 656 smc_clcsock_user_data(clcsk); 657 658 if (!smc) 659 return; 660 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_write_space); 661 } 662 663 static void smc_fback_error_report(struct sock *clcsk) 664 { 665 struct smc_sock *smc = 666 smc_clcsock_user_data(clcsk); 667 668 if (!smc) 669 return; 670 smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_error_report); 671 } 672 673 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code) 674 { 675 struct sock *clcsk; 676 int rc = 0; 677 678 mutex_lock(&smc->clcsock_release_lock); 679 if (!smc->clcsock) { 680 rc = -EBADF; 681 goto out; 682 } 683 clcsk = smc->clcsock->sk; 684 685 if (smc->use_fallback) 686 goto out; 687 smc->use_fallback = true; 688 smc->fallback_rsn = reason_code; 689 smc_stat_fallback(smc); 690 trace_smc_switch_to_fallback(smc, reason_code); 691 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 692 smc->clcsock->file = smc->sk.sk_socket->file; 693 smc->clcsock->file->private_data = smc->clcsock; 694 smc->clcsock->wq.fasync_list = 695 smc->sk.sk_socket->wq.fasync_list; 696 697 /* There might be some wait entries remaining 698 * in smc sk->sk_wq and they should be woken up 699 * as clcsock's wait queue is woken up. 700 */ 701 smc->clcsk_state_change = clcsk->sk_state_change; 702 smc->clcsk_data_ready = clcsk->sk_data_ready; 703 smc->clcsk_write_space = clcsk->sk_write_space; 704 smc->clcsk_error_report = clcsk->sk_error_report; 705 706 clcsk->sk_state_change = smc_fback_state_change; 707 clcsk->sk_data_ready = smc_fback_data_ready; 708 clcsk->sk_write_space = smc_fback_write_space; 709 clcsk->sk_error_report = smc_fback_error_report; 710 711 smc->clcsock->sk->sk_user_data = 712 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 713 } 714 out: 715 mutex_unlock(&smc->clcsock_release_lock); 716 return rc; 717 } 718 719 /* fall back during connect */ 720 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 721 { 722 struct net *net = sock_net(&smc->sk); 723 int rc = 0; 724 725 rc = smc_switch_to_fallback(smc, reason_code); 726 if (rc) { /* fallback fails */ 727 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 728 if (smc->sk.sk_state == SMC_INIT) 729 sock_put(&smc->sk); /* passive closing */ 730 return rc; 731 } 732 smc_copy_sock_settings_to_clc(smc); 733 smc->connect_nonblock = 0; 734 if (smc->sk.sk_state == SMC_INIT) 735 smc->sk.sk_state = SMC_ACTIVE; 736 return 0; 737 } 738 739 /* decline and fall back during connect */ 740 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 741 u8 version) 742 { 743 struct net *net = sock_net(&smc->sk); 744 int rc; 745 746 if (reason_code < 0) { /* error, fallback is not possible */ 747 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 748 if (smc->sk.sk_state == SMC_INIT) 749 sock_put(&smc->sk); /* passive closing */ 750 return reason_code; 751 } 752 if (reason_code != SMC_CLC_DECL_PEERDECL) { 753 rc = smc_clc_send_decline(smc, reason_code, version); 754 if (rc < 0) { 755 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 756 if (smc->sk.sk_state == SMC_INIT) 757 sock_put(&smc->sk); /* passive closing */ 758 return rc; 759 } 760 } 761 return smc_connect_fallback(smc, reason_code); 762 } 763 764 static void smc_conn_abort(struct smc_sock *smc, int local_first) 765 { 766 struct smc_connection *conn = &smc->conn; 767 struct smc_link_group *lgr = conn->lgr; 768 bool lgr_valid = false; 769 770 if (smc_conn_lgr_valid(conn)) 771 lgr_valid = true; 772 773 smc_conn_free(conn); 774 if (local_first && lgr_valid) 775 smc_lgr_cleanup_early(lgr); 776 } 777 778 /* check if there is a rdma device available for this connection. */ 779 /* called for connect and listen */ 780 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 781 { 782 /* PNET table look up: search active ib_device and port 783 * within same PNETID that also contains the ethernet device 784 * used for the internal TCP socket 785 */ 786 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 787 if (!ini->check_smcrv2 && !ini->ib_dev) 788 return SMC_CLC_DECL_NOSMCRDEV; 789 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) 790 return SMC_CLC_DECL_NOSMCRDEV; 791 return 0; 792 } 793 794 /* check if there is an ISM device available for this connection. */ 795 /* called for connect and listen */ 796 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 797 { 798 /* Find ISM device with same PNETID as connecting interface */ 799 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 800 if (!ini->ism_dev[0]) 801 return SMC_CLC_DECL_NOSMCDDEV; 802 else 803 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 804 return 0; 805 } 806 807 /* is chid unique for the ism devices that are already determined? */ 808 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 809 int cnt) 810 { 811 int i = (!ini->ism_dev[0]) ? 1 : 0; 812 813 for (; i < cnt; i++) 814 if (ini->ism_chid[i] == chid) 815 return false; 816 return true; 817 } 818 819 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus 820 * PNETID matching net_device) 821 */ 822 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 823 struct smc_init_info *ini) 824 { 825 int rc = SMC_CLC_DECL_NOSMCDDEV; 826 struct smcd_dev *smcd; 827 int i = 1; 828 u16 chid; 829 830 if (smcd_indicated(ini->smc_type_v1)) 831 rc = 0; /* already initialized for V1 */ 832 mutex_lock(&smcd_dev_list.mutex); 833 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 834 if (smcd->going_away || smcd == ini->ism_dev[0]) 835 continue; 836 chid = smc_ism_get_chid(smcd); 837 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 838 continue; 839 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 840 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 841 ini->ism_dev[i] = smcd; 842 ini->ism_chid[i] = chid; 843 ini->is_smcd = true; 844 rc = 0; 845 i++; 846 if (i > SMC_MAX_ISM_DEVS) 847 break; 848 } 849 } 850 mutex_unlock(&smcd_dev_list.mutex); 851 ini->ism_offered_cnt = i - 1; 852 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 853 ini->smcd_version = 0; 854 855 return rc; 856 } 857 858 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 859 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 860 struct smc_init_info *ini) 861 { 862 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 863 return SMC_CLC_DECL_ISMVLANERR; 864 return 0; 865 } 866 867 static int smc_find_proposal_devices(struct smc_sock *smc, 868 struct smc_init_info *ini) 869 { 870 int rc = 0; 871 872 /* check if there is an ism device available */ 873 if (!(ini->smcd_version & SMC_V1) || 874 smc_find_ism_device(smc, ini) || 875 smc_connect_ism_vlan_setup(smc, ini)) 876 ini->smcd_version &= ~SMC_V1; 877 /* else ISM V1 is supported for this connection */ 878 879 /* check if there is an rdma device available */ 880 if (!(ini->smcr_version & SMC_V1) || 881 smc_find_rdma_device(smc, ini)) 882 ini->smcr_version &= ~SMC_V1; 883 /* else RDMA is supported for this connection */ 884 885 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 886 ini->smcr_version & SMC_V1); 887 888 /* check if there is an ism v2 device available */ 889 if (!(ini->smcd_version & SMC_V2) || 890 !smc_ism_is_v2_capable() || 891 smc_find_ism_v2_device_clnt(smc, ini)) 892 ini->smcd_version &= ~SMC_V2; 893 894 /* check if there is an rdma v2 device available */ 895 ini->check_smcrv2 = true; 896 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 897 if (!(ini->smcr_version & SMC_V2) || 898 smc->clcsock->sk->sk_family != AF_INET || 899 !smc_clc_ueid_count() || 900 smc_find_rdma_device(smc, ini)) 901 ini->smcr_version &= ~SMC_V2; 902 ini->check_smcrv2 = false; 903 904 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 905 ini->smcr_version & SMC_V2); 906 907 /* if neither ISM nor RDMA are supported, fallback */ 908 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 909 rc = SMC_CLC_DECL_NOSMCDEV; 910 911 return rc; 912 } 913 914 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 915 * used, the VLAN ID will be registered again during the connection setup. 916 */ 917 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 918 struct smc_init_info *ini) 919 { 920 if (!smcd_indicated(ini->smc_type_v1)) 921 return 0; 922 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 923 return SMC_CLC_DECL_CNFERR; 924 return 0; 925 } 926 927 #define SMC_CLC_MAX_ACCEPT_LEN \ 928 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \ 929 sizeof(struct smc_clc_first_contact_ext) + \ 930 sizeof(struct smc_clc_msg_trail)) 931 932 /* CLC handshake during connect */ 933 static int smc_connect_clc(struct smc_sock *smc, 934 struct smc_clc_msg_accept_confirm_v2 *aclc2, 935 struct smc_init_info *ini) 936 { 937 int rc = 0; 938 939 /* do inband token exchange */ 940 rc = smc_clc_send_proposal(smc, ini); 941 if (rc) 942 return rc; 943 /* receive SMC Accept CLC message */ 944 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, 945 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 946 } 947 948 void smc_fill_gid_list(struct smc_link_group *lgr, 949 struct smc_gidlist *gidlist, 950 struct smc_ib_device *known_dev, u8 *known_gid) 951 { 952 struct smc_init_info *alt_ini = NULL; 953 954 memset(gidlist, 0, sizeof(*gidlist)); 955 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 956 957 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 958 if (!alt_ini) 959 goto out; 960 961 alt_ini->vlan_id = lgr->vlan_id; 962 alt_ini->check_smcrv2 = true; 963 alt_ini->smcrv2.saddr = lgr->saddr; 964 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 965 966 if (!alt_ini->smcrv2.ib_dev_v2) 967 goto out; 968 969 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 970 SMC_GID_SIZE); 971 972 out: 973 kfree(alt_ini); 974 } 975 976 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 977 struct smc_clc_msg_accept_confirm *aclc, 978 struct smc_init_info *ini) 979 { 980 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 981 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 982 struct smc_clc_first_contact_ext *fce = 983 (struct smc_clc_first_contact_ext *) 984 (((u8 *)clc_v2) + sizeof(*clc_v2)); 985 986 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 987 return 0; 988 989 if (fce->v2_direct) { 990 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 991 ini->smcrv2.uses_gateway = false; 992 } else { 993 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr, 994 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 995 ini->smcrv2.nexthop_mac, 996 &ini->smcrv2.uses_gateway)) 997 return SMC_CLC_DECL_NOROUTE; 998 if (!ini->smcrv2.uses_gateway) { 999 /* mismatch: peer claims indirect, but its direct */ 1000 return SMC_CLC_DECL_NOINDIRECT; 1001 } 1002 } 1003 return 0; 1004 } 1005 1006 /* setup for RDMA connection of client */ 1007 static int smc_connect_rdma(struct smc_sock *smc, 1008 struct smc_clc_msg_accept_confirm *aclc, 1009 struct smc_init_info *ini) 1010 { 1011 int i, reason_code = 0; 1012 struct smc_link *link; 1013 u8 *eid = NULL; 1014 1015 ini->is_smcd = false; 1016 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 1017 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1018 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 1019 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 1020 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 1021 1022 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 1023 if (reason_code) 1024 return reason_code; 1025 1026 mutex_lock(&smc_client_lgr_pending); 1027 reason_code = smc_conn_create(smc, ini); 1028 if (reason_code) { 1029 mutex_unlock(&smc_client_lgr_pending); 1030 return reason_code; 1031 } 1032 1033 smc_conn_save_peer_info(smc, aclc); 1034 1035 if (ini->first_contact_local) { 1036 link = smc->conn.lnk; 1037 } else { 1038 /* set link that was assigned by server */ 1039 link = NULL; 1040 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1041 struct smc_link *l = &smc->conn.lgr->lnk[i]; 1042 1043 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 1044 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 1045 SMC_GID_SIZE) && 1046 (aclc->hdr.version > SMC_V1 || 1047 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 1048 sizeof(l->peer_mac)))) { 1049 link = l; 1050 break; 1051 } 1052 } 1053 if (!link) { 1054 reason_code = SMC_CLC_DECL_NOSRVLINK; 1055 goto connect_abort; 1056 } 1057 smc_switch_link_and_count(&smc->conn, link); 1058 } 1059 1060 /* create send buffer and rmb */ 1061 if (smc_buf_create(smc, false)) { 1062 reason_code = SMC_CLC_DECL_MEM; 1063 goto connect_abort; 1064 } 1065 1066 if (ini->first_contact_local) 1067 smc_link_save_peer_info(link, aclc, ini); 1068 1069 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 1070 reason_code = SMC_CLC_DECL_ERR_RTOK; 1071 goto connect_abort; 1072 } 1073 1074 smc_close_init(smc); 1075 smc_rx_init(smc); 1076 1077 if (ini->first_contact_local) { 1078 if (smc_ib_ready_link(link)) { 1079 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1080 goto connect_abort; 1081 } 1082 } else { 1083 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 1084 reason_code = SMC_CLC_DECL_ERR_REGRMB; 1085 goto connect_abort; 1086 } 1087 } 1088 smc_rmb_sync_sg_for_device(&smc->conn); 1089 1090 if (aclc->hdr.version > SMC_V1) { 1091 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1092 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1093 1094 eid = clc_v2->r1.eid; 1095 if (ini->first_contact_local) 1096 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 1097 link->smcibdev, link->gid); 1098 } 1099 1100 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 1101 aclc->hdr.version, eid, ini); 1102 if (reason_code) 1103 goto connect_abort; 1104 1105 smc_tx_init(smc); 1106 1107 if (ini->first_contact_local) { 1108 /* QP confirmation over RoCE fabric */ 1109 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1110 reason_code = smcr_clnt_conf_first_link(smc); 1111 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1112 if (reason_code) 1113 goto connect_abort; 1114 } 1115 mutex_unlock(&smc_client_lgr_pending); 1116 1117 smc_copy_sock_settings_to_clc(smc); 1118 smc->connect_nonblock = 0; 1119 if (smc->sk.sk_state == SMC_INIT) 1120 smc->sk.sk_state = SMC_ACTIVE; 1121 1122 return 0; 1123 connect_abort: 1124 smc_conn_abort(smc, ini->first_contact_local); 1125 mutex_unlock(&smc_client_lgr_pending); 1126 smc->connect_nonblock = 0; 1127 1128 return reason_code; 1129 } 1130 1131 /* The server has chosen one of the proposed ISM devices for the communication. 1132 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1133 */ 1134 static int 1135 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 1136 struct smc_init_info *ini) 1137 { 1138 int i; 1139 1140 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1141 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1142 ini->ism_selected = i; 1143 return 0; 1144 } 1145 } 1146 1147 return -EPROTO; 1148 } 1149 1150 /* setup for ISM connection of client */ 1151 static int smc_connect_ism(struct smc_sock *smc, 1152 struct smc_clc_msg_accept_confirm *aclc, 1153 struct smc_init_info *ini) 1154 { 1155 u8 *eid = NULL; 1156 int rc = 0; 1157 1158 ini->is_smcd = true; 1159 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1160 1161 if (aclc->hdr.version == SMC_V2) { 1162 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 1163 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1164 1165 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 1166 if (rc) 1167 return rc; 1168 } 1169 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 1170 1171 /* there is only one lgr role for SMC-D; use server lock */ 1172 mutex_lock(&smc_server_lgr_pending); 1173 rc = smc_conn_create(smc, ini); 1174 if (rc) { 1175 mutex_unlock(&smc_server_lgr_pending); 1176 return rc; 1177 } 1178 1179 /* Create send and receive buffers */ 1180 rc = smc_buf_create(smc, true); 1181 if (rc) { 1182 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1183 goto connect_abort; 1184 } 1185 1186 smc_conn_save_peer_info(smc, aclc); 1187 smc_close_init(smc); 1188 smc_rx_init(smc); 1189 smc_tx_init(smc); 1190 1191 if (aclc->hdr.version > SMC_V1) { 1192 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1193 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1194 1195 eid = clc_v2->d1.eid; 1196 } 1197 1198 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1199 aclc->hdr.version, eid, NULL); 1200 if (rc) 1201 goto connect_abort; 1202 mutex_unlock(&smc_server_lgr_pending); 1203 1204 smc_copy_sock_settings_to_clc(smc); 1205 smc->connect_nonblock = 0; 1206 if (smc->sk.sk_state == SMC_INIT) 1207 smc->sk.sk_state = SMC_ACTIVE; 1208 1209 return 0; 1210 connect_abort: 1211 smc_conn_abort(smc, ini->first_contact_local); 1212 mutex_unlock(&smc_server_lgr_pending); 1213 smc->connect_nonblock = 0; 1214 1215 return rc; 1216 } 1217 1218 /* check if received accept type and version matches a proposed one */ 1219 static int smc_connect_check_aclc(struct smc_init_info *ini, 1220 struct smc_clc_msg_accept_confirm *aclc) 1221 { 1222 if (aclc->hdr.typev1 != SMC_TYPE_R && 1223 aclc->hdr.typev1 != SMC_TYPE_D) 1224 return SMC_CLC_DECL_MODEUNSUPP; 1225 1226 if (aclc->hdr.version >= SMC_V2) { 1227 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1228 !smcr_indicated(ini->smc_type_v2)) || 1229 (aclc->hdr.typev1 == SMC_TYPE_D && 1230 !smcd_indicated(ini->smc_type_v2))) 1231 return SMC_CLC_DECL_MODEUNSUPP; 1232 } else { 1233 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1234 !smcr_indicated(ini->smc_type_v1)) || 1235 (aclc->hdr.typev1 == SMC_TYPE_D && 1236 !smcd_indicated(ini->smc_type_v1))) 1237 return SMC_CLC_DECL_MODEUNSUPP; 1238 } 1239 1240 return 0; 1241 } 1242 1243 /* perform steps before actually connecting */ 1244 static int __smc_connect(struct smc_sock *smc) 1245 { 1246 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1247 struct smc_clc_msg_accept_confirm_v2 *aclc2; 1248 struct smc_clc_msg_accept_confirm *aclc; 1249 struct smc_init_info *ini = NULL; 1250 u8 *buf = NULL; 1251 int rc = 0; 1252 1253 if (smc->use_fallback) 1254 return smc_connect_fallback(smc, smc->fallback_rsn); 1255 1256 /* if peer has not signalled SMC-capability, fall back */ 1257 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1258 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1259 1260 /* IPSec connections opt out of SMC optimizations */ 1261 if (using_ipsec(smc)) 1262 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1263 version); 1264 1265 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1266 if (!ini) 1267 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1268 version); 1269 1270 ini->smcd_version = SMC_V1 | SMC_V2; 1271 ini->smcr_version = SMC_V1 | SMC_V2; 1272 ini->smc_type_v1 = SMC_TYPE_B; 1273 ini->smc_type_v2 = SMC_TYPE_B; 1274 1275 /* get vlan id from IP device */ 1276 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1277 ini->smcd_version &= ~SMC_V1; 1278 ini->smcr_version = 0; 1279 ini->smc_type_v1 = SMC_TYPE_N; 1280 if (!ini->smcd_version) { 1281 rc = SMC_CLC_DECL_GETVLANERR; 1282 goto fallback; 1283 } 1284 } 1285 1286 rc = smc_find_proposal_devices(smc, ini); 1287 if (rc) 1288 goto fallback; 1289 1290 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1291 if (!buf) { 1292 rc = SMC_CLC_DECL_MEM; 1293 goto fallback; 1294 } 1295 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1296 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1297 1298 /* perform CLC handshake */ 1299 rc = smc_connect_clc(smc, aclc2, ini); 1300 if (rc) 1301 goto vlan_cleanup; 1302 1303 /* check if smc modes and versions of CLC proposal and accept match */ 1304 rc = smc_connect_check_aclc(ini, aclc); 1305 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1306 if (rc) 1307 goto vlan_cleanup; 1308 1309 /* depending on previous steps, connect using rdma or ism */ 1310 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1311 ini->smcr_version = version; 1312 rc = smc_connect_rdma(smc, aclc, ini); 1313 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1314 ini->smcd_version = version; 1315 rc = smc_connect_ism(smc, aclc, ini); 1316 } 1317 if (rc) 1318 goto vlan_cleanup; 1319 1320 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1321 smc_connect_ism_vlan_cleanup(smc, ini); 1322 kfree(buf); 1323 kfree(ini); 1324 return 0; 1325 1326 vlan_cleanup: 1327 smc_connect_ism_vlan_cleanup(smc, ini); 1328 kfree(buf); 1329 fallback: 1330 kfree(ini); 1331 return smc_connect_decline_fallback(smc, rc, version); 1332 } 1333 1334 static void smc_connect_work(struct work_struct *work) 1335 { 1336 struct smc_sock *smc = container_of(work, struct smc_sock, 1337 connect_work); 1338 long timeo = smc->sk.sk_sndtimeo; 1339 int rc = 0; 1340 1341 if (!timeo) 1342 timeo = MAX_SCHEDULE_TIMEOUT; 1343 lock_sock(smc->clcsock->sk); 1344 if (smc->clcsock->sk->sk_err) { 1345 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1346 } else if ((1 << smc->clcsock->sk->sk_state) & 1347 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1348 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1349 if ((rc == -EPIPE) && 1350 ((1 << smc->clcsock->sk->sk_state) & 1351 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1352 rc = 0; 1353 } 1354 release_sock(smc->clcsock->sk); 1355 lock_sock(&smc->sk); 1356 if (rc != 0 || smc->sk.sk_err) { 1357 smc->sk.sk_state = SMC_CLOSED; 1358 if (rc == -EPIPE || rc == -EAGAIN) 1359 smc->sk.sk_err = EPIPE; 1360 else if (signal_pending(current)) 1361 smc->sk.sk_err = -sock_intr_errno(timeo); 1362 sock_put(&smc->sk); /* passive closing */ 1363 goto out; 1364 } 1365 1366 rc = __smc_connect(smc); 1367 if (rc < 0) 1368 smc->sk.sk_err = -rc; 1369 1370 out: 1371 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1372 if (smc->sk.sk_err) { 1373 smc->sk.sk_state_change(&smc->sk); 1374 } else { /* allow polling before and after fallback decision */ 1375 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1376 smc->sk.sk_write_space(&smc->sk); 1377 } 1378 } 1379 release_sock(&smc->sk); 1380 } 1381 1382 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1383 int alen, int flags) 1384 { 1385 struct sock *sk = sock->sk; 1386 struct smc_sock *smc; 1387 int rc = -EINVAL; 1388 1389 smc = smc_sk(sk); 1390 1391 /* separate smc parameter checking to be safe */ 1392 if (alen < sizeof(addr->sa_family)) 1393 goto out_err; 1394 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1395 goto out_err; 1396 1397 lock_sock(sk); 1398 switch (sk->sk_state) { 1399 default: 1400 goto out; 1401 case SMC_ACTIVE: 1402 rc = -EISCONN; 1403 goto out; 1404 case SMC_INIT: 1405 break; 1406 } 1407 1408 smc_copy_sock_settings_to_clc(smc); 1409 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1410 if (smc->connect_nonblock) { 1411 rc = -EALREADY; 1412 goto out; 1413 } 1414 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1415 if (rc && rc != -EINPROGRESS) 1416 goto out; 1417 1418 sock_hold(&smc->sk); /* sock put in passive closing */ 1419 if (smc->use_fallback) 1420 goto out; 1421 if (flags & O_NONBLOCK) { 1422 if (queue_work(smc_hs_wq, &smc->connect_work)) 1423 smc->connect_nonblock = 1; 1424 rc = -EINPROGRESS; 1425 } else { 1426 rc = __smc_connect(smc); 1427 if (rc < 0) 1428 goto out; 1429 else 1430 rc = 0; /* success cases including fallback */ 1431 } 1432 1433 out: 1434 release_sock(sk); 1435 out_err: 1436 return rc; 1437 } 1438 1439 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1440 { 1441 struct socket *new_clcsock = NULL; 1442 struct sock *lsk = &lsmc->sk; 1443 struct sock *new_sk; 1444 int rc = -EINVAL; 1445 1446 release_sock(lsk); 1447 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1448 if (!new_sk) { 1449 rc = -ENOMEM; 1450 lsk->sk_err = ENOMEM; 1451 *new_smc = NULL; 1452 lock_sock(lsk); 1453 goto out; 1454 } 1455 *new_smc = smc_sk(new_sk); 1456 1457 mutex_lock(&lsmc->clcsock_release_lock); 1458 if (lsmc->clcsock) 1459 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1460 mutex_unlock(&lsmc->clcsock_release_lock); 1461 lock_sock(lsk); 1462 if (rc < 0 && rc != -EAGAIN) 1463 lsk->sk_err = -rc; 1464 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1465 new_sk->sk_prot->unhash(new_sk); 1466 if (new_clcsock) 1467 sock_release(new_clcsock); 1468 new_sk->sk_state = SMC_CLOSED; 1469 sock_set_flag(new_sk, SOCK_DEAD); 1470 sock_put(new_sk); /* final */ 1471 *new_smc = NULL; 1472 goto out; 1473 } 1474 1475 /* new clcsock has inherited the smc listen-specific sk_data_ready 1476 * function; switch it back to the original sk_data_ready function 1477 */ 1478 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1479 (*new_smc)->clcsock = new_clcsock; 1480 out: 1481 return rc; 1482 } 1483 1484 /* add a just created sock to the accept queue of the listen sock as 1485 * candidate for a following socket accept call from user space 1486 */ 1487 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1488 { 1489 struct smc_sock *par = smc_sk(parent); 1490 1491 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1492 spin_lock(&par->accept_q_lock); 1493 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1494 spin_unlock(&par->accept_q_lock); 1495 sk_acceptq_added(parent); 1496 } 1497 1498 /* remove a socket from the accept queue of its parental listening socket */ 1499 static void smc_accept_unlink(struct sock *sk) 1500 { 1501 struct smc_sock *par = smc_sk(sk)->listen_smc; 1502 1503 spin_lock(&par->accept_q_lock); 1504 list_del_init(&smc_sk(sk)->accept_q); 1505 spin_unlock(&par->accept_q_lock); 1506 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1507 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1508 } 1509 1510 /* remove a sock from the accept queue to bind it to a new socket created 1511 * for a socket accept call from user space 1512 */ 1513 struct sock *smc_accept_dequeue(struct sock *parent, 1514 struct socket *new_sock) 1515 { 1516 struct smc_sock *isk, *n; 1517 struct sock *new_sk; 1518 1519 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1520 new_sk = (struct sock *)isk; 1521 1522 smc_accept_unlink(new_sk); 1523 if (new_sk->sk_state == SMC_CLOSED) { 1524 new_sk->sk_prot->unhash(new_sk); 1525 if (isk->clcsock) { 1526 sock_release(isk->clcsock); 1527 isk->clcsock = NULL; 1528 } 1529 sock_put(new_sk); /* final */ 1530 continue; 1531 } 1532 if (new_sock) { 1533 sock_graft(new_sk, new_sock); 1534 if (isk->use_fallback) { 1535 smc_sk(new_sk)->clcsock->file = new_sock->file; 1536 isk->clcsock->file->private_data = isk->clcsock; 1537 } 1538 } 1539 return new_sk; 1540 } 1541 return NULL; 1542 } 1543 1544 /* clean up for a created but never accepted sock */ 1545 void smc_close_non_accepted(struct sock *sk) 1546 { 1547 struct smc_sock *smc = smc_sk(sk); 1548 1549 sock_hold(sk); /* sock_put below */ 1550 lock_sock(sk); 1551 if (!sk->sk_lingertime) 1552 /* wait for peer closing */ 1553 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1554 __smc_release(smc); 1555 release_sock(sk); 1556 sock_put(sk); /* sock_hold above */ 1557 sock_put(sk); /* final sock_put */ 1558 } 1559 1560 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1561 { 1562 struct smc_link *link = smc->conn.lnk; 1563 struct smc_llc_qentry *qentry; 1564 int rc; 1565 1566 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1567 return SMC_CLC_DECL_ERR_REGRMB; 1568 1569 /* send CONFIRM LINK request to client over the RoCE fabric */ 1570 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1571 if (rc < 0) 1572 return SMC_CLC_DECL_TIMEOUT_CL; 1573 1574 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1575 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1576 SMC_LLC_CONFIRM_LINK); 1577 if (!qentry) { 1578 struct smc_clc_msg_decline dclc; 1579 1580 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1581 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1582 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1583 } 1584 smc_llc_save_peer_uid(qentry); 1585 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1586 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1587 if (rc) 1588 return SMC_CLC_DECL_RMBE_EC; 1589 1590 /* confirm_rkey is implicit on 1st contact */ 1591 smc->conn.rmb_desc->is_conf_rkey = true; 1592 1593 smc_llc_link_active(link); 1594 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1595 1596 /* initial contact - try to establish second link */ 1597 smc_llc_srv_add_link(link, NULL); 1598 return 0; 1599 } 1600 1601 /* listen worker: finish */ 1602 static void smc_listen_out(struct smc_sock *new_smc) 1603 { 1604 struct smc_sock *lsmc = new_smc->listen_smc; 1605 struct sock *newsmcsk = &new_smc->sk; 1606 1607 if (lsmc->sk.sk_state == SMC_LISTEN) { 1608 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1609 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1610 release_sock(&lsmc->sk); 1611 } else { /* no longer listening */ 1612 smc_close_non_accepted(newsmcsk); 1613 } 1614 1615 /* Wake up accept */ 1616 lsmc->sk.sk_data_ready(&lsmc->sk); 1617 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1618 } 1619 1620 /* listen worker: finish in state connected */ 1621 static void smc_listen_out_connected(struct smc_sock *new_smc) 1622 { 1623 struct sock *newsmcsk = &new_smc->sk; 1624 1625 sk_refcnt_debug_inc(newsmcsk); 1626 if (newsmcsk->sk_state == SMC_INIT) 1627 newsmcsk->sk_state = SMC_ACTIVE; 1628 1629 smc_listen_out(new_smc); 1630 } 1631 1632 /* listen worker: finish in error state */ 1633 static void smc_listen_out_err(struct smc_sock *new_smc) 1634 { 1635 struct sock *newsmcsk = &new_smc->sk; 1636 struct net *net = sock_net(newsmcsk); 1637 1638 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1639 if (newsmcsk->sk_state == SMC_INIT) 1640 sock_put(&new_smc->sk); /* passive closing */ 1641 newsmcsk->sk_state = SMC_CLOSED; 1642 1643 smc_listen_out(new_smc); 1644 } 1645 1646 /* listen worker: decline and fall back if possible */ 1647 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1648 int local_first, u8 version) 1649 { 1650 /* RDMA setup failed, switch back to TCP */ 1651 smc_conn_abort(new_smc, local_first); 1652 if (reason_code < 0 || 1653 smc_switch_to_fallback(new_smc, reason_code)) { 1654 /* error, no fallback possible */ 1655 smc_listen_out_err(new_smc); 1656 return; 1657 } 1658 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1659 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1660 smc_listen_out_err(new_smc); 1661 return; 1662 } 1663 } 1664 smc_listen_out_connected(new_smc); 1665 } 1666 1667 /* listen worker: version checking */ 1668 static int smc_listen_v2_check(struct smc_sock *new_smc, 1669 struct smc_clc_msg_proposal *pclc, 1670 struct smc_init_info *ini) 1671 { 1672 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1673 struct smc_clc_v2_extension *pclc_v2_ext; 1674 int rc = SMC_CLC_DECL_PEERNOSMC; 1675 1676 ini->smc_type_v1 = pclc->hdr.typev1; 1677 ini->smc_type_v2 = pclc->hdr.typev2; 1678 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1679 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1680 if (pclc->hdr.version > SMC_V1) { 1681 if (smcd_indicated(ini->smc_type_v2)) 1682 ini->smcd_version |= SMC_V2; 1683 if (smcr_indicated(ini->smc_type_v2)) 1684 ini->smcr_version |= SMC_V2; 1685 } 1686 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 1687 rc = SMC_CLC_DECL_PEERNOSMC; 1688 goto out; 1689 } 1690 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1691 if (!pclc_v2_ext) { 1692 ini->smcd_version &= ~SMC_V2; 1693 ini->smcr_version &= ~SMC_V2; 1694 rc = SMC_CLC_DECL_NOV2EXT; 1695 goto out; 1696 } 1697 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1698 if (ini->smcd_version & SMC_V2) { 1699 if (!smc_ism_is_v2_capable()) { 1700 ini->smcd_version &= ~SMC_V2; 1701 rc = SMC_CLC_DECL_NOISM2SUPP; 1702 } else if (!pclc_smcd_v2_ext) { 1703 ini->smcd_version &= ~SMC_V2; 1704 rc = SMC_CLC_DECL_NOV2DEXT; 1705 } else if (!pclc_v2_ext->hdr.eid_cnt && 1706 !pclc_v2_ext->hdr.flag.seid) { 1707 ini->smcd_version &= ~SMC_V2; 1708 rc = SMC_CLC_DECL_NOUEID; 1709 } 1710 } 1711 if (ini->smcr_version & SMC_V2) { 1712 if (!pclc_v2_ext->hdr.eid_cnt) { 1713 ini->smcr_version &= ~SMC_V2; 1714 rc = SMC_CLC_DECL_NOUEID; 1715 } 1716 } 1717 1718 out: 1719 if (!ini->smcd_version && !ini->smcr_version) 1720 return rc; 1721 1722 return 0; 1723 } 1724 1725 /* listen worker: check prefixes */ 1726 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1727 struct smc_clc_msg_proposal *pclc) 1728 { 1729 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1730 struct socket *newclcsock = new_smc->clcsock; 1731 1732 if (pclc->hdr.typev1 == SMC_TYPE_N) 1733 return 0; 1734 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1735 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1736 return SMC_CLC_DECL_DIFFPREFIX; 1737 1738 return 0; 1739 } 1740 1741 /* listen worker: initialize connection and buffers */ 1742 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1743 struct smc_init_info *ini) 1744 { 1745 int rc; 1746 1747 /* allocate connection / link group */ 1748 rc = smc_conn_create(new_smc, ini); 1749 if (rc) 1750 return rc; 1751 1752 /* create send buffer and rmb */ 1753 if (smc_buf_create(new_smc, false)) 1754 return SMC_CLC_DECL_MEM; 1755 1756 return 0; 1757 } 1758 1759 /* listen worker: initialize connection and buffers for SMC-D */ 1760 static int smc_listen_ism_init(struct smc_sock *new_smc, 1761 struct smc_init_info *ini) 1762 { 1763 int rc; 1764 1765 rc = smc_conn_create(new_smc, ini); 1766 if (rc) 1767 return rc; 1768 1769 /* Create send and receive buffers */ 1770 rc = smc_buf_create(new_smc, true); 1771 if (rc) { 1772 smc_conn_abort(new_smc, ini->first_contact_local); 1773 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1774 SMC_CLC_DECL_MEM; 1775 } 1776 1777 return 0; 1778 } 1779 1780 static bool smc_is_already_selected(struct smcd_dev *smcd, 1781 struct smc_init_info *ini, 1782 int matches) 1783 { 1784 int i; 1785 1786 for (i = 0; i < matches; i++) 1787 if (smcd == ini->ism_dev[i]) 1788 return true; 1789 1790 return false; 1791 } 1792 1793 /* check for ISM devices matching proposed ISM devices */ 1794 static void smc_check_ism_v2_match(struct smc_init_info *ini, 1795 u16 proposed_chid, u64 proposed_gid, 1796 unsigned int *matches) 1797 { 1798 struct smcd_dev *smcd; 1799 1800 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1801 if (smcd->going_away) 1802 continue; 1803 if (smc_is_already_selected(smcd, ini, *matches)) 1804 continue; 1805 if (smc_ism_get_chid(smcd) == proposed_chid && 1806 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1807 ini->ism_peer_gid[*matches] = proposed_gid; 1808 ini->ism_dev[*matches] = smcd; 1809 (*matches)++; 1810 break; 1811 } 1812 } 1813 } 1814 1815 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 1816 { 1817 if (!ini->rc) 1818 ini->rc = rc; 1819 } 1820 1821 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1822 struct smc_clc_msg_proposal *pclc, 1823 struct smc_init_info *ini) 1824 { 1825 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1826 struct smc_clc_v2_extension *smc_v2_ext; 1827 struct smc_clc_msg_smcd *pclc_smcd; 1828 unsigned int matches = 0; 1829 u8 smcd_version; 1830 u8 *eid = NULL; 1831 int i, rc; 1832 1833 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1834 goto not_found; 1835 1836 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1837 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1838 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1839 1840 mutex_lock(&smcd_dev_list.mutex); 1841 if (pclc_smcd->ism.chid) 1842 /* check for ISM device matching proposed native ISM device */ 1843 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1844 ntohll(pclc_smcd->ism.gid), &matches); 1845 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1846 /* check for ISM devices matching proposed non-native ISM 1847 * devices 1848 */ 1849 smc_check_ism_v2_match(ini, 1850 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1851 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1852 &matches); 1853 } 1854 mutex_unlock(&smcd_dev_list.mutex); 1855 1856 if (!ini->ism_dev[0]) { 1857 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 1858 goto not_found; 1859 } 1860 1861 smc_ism_get_system_eid(&eid); 1862 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 1863 smcd_v2_ext->system_eid, eid)) 1864 goto not_found; 1865 1866 /* separate - outside the smcd_dev_list.lock */ 1867 smcd_version = ini->smcd_version; 1868 for (i = 0; i < matches; i++) { 1869 ini->smcd_version = SMC_V2; 1870 ini->is_smcd = true; 1871 ini->ism_selected = i; 1872 rc = smc_listen_ism_init(new_smc, ini); 1873 if (rc) { 1874 smc_find_ism_store_rc(rc, ini); 1875 /* try next active ISM device */ 1876 continue; 1877 } 1878 return; /* matching and usable V2 ISM device found */ 1879 } 1880 /* no V2 ISM device could be initialized */ 1881 ini->smcd_version = smcd_version; /* restore original value */ 1882 ini->negotiated_eid[0] = 0; 1883 1884 not_found: 1885 ini->smcd_version &= ~SMC_V2; 1886 ini->ism_dev[0] = NULL; 1887 ini->is_smcd = false; 1888 } 1889 1890 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1891 struct smc_clc_msg_proposal *pclc, 1892 struct smc_init_info *ini) 1893 { 1894 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1895 int rc = 0; 1896 1897 /* check if ISM V1 is available */ 1898 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1899 goto not_found; 1900 ini->is_smcd = true; /* prepare ISM check */ 1901 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1902 rc = smc_find_ism_device(new_smc, ini); 1903 if (rc) 1904 goto not_found; 1905 ini->ism_selected = 0; 1906 rc = smc_listen_ism_init(new_smc, ini); 1907 if (!rc) 1908 return; /* V1 ISM device found */ 1909 1910 not_found: 1911 smc_find_ism_store_rc(rc, ini); 1912 ini->smcd_version &= ~SMC_V1; 1913 ini->ism_dev[0] = NULL; 1914 ini->is_smcd = false; 1915 } 1916 1917 /* listen worker: register buffers */ 1918 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1919 { 1920 struct smc_connection *conn = &new_smc->conn; 1921 1922 if (!local_first) { 1923 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1924 return SMC_CLC_DECL_ERR_REGRMB; 1925 } 1926 smc_rmb_sync_sg_for_device(&new_smc->conn); 1927 1928 return 0; 1929 } 1930 1931 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 1932 struct smc_clc_msg_proposal *pclc, 1933 struct smc_init_info *ini) 1934 { 1935 struct smc_clc_v2_extension *smc_v2_ext; 1936 u8 smcr_version; 1937 int rc; 1938 1939 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 1940 goto not_found; 1941 1942 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1943 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 1944 goto not_found; 1945 1946 /* prepare RDMA check */ 1947 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1948 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 1949 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1950 ini->check_smcrv2 = true; 1951 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 1952 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 1953 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 1954 rc = smc_find_rdma_device(new_smc, ini); 1955 if (rc) { 1956 smc_find_ism_store_rc(rc, ini); 1957 goto not_found; 1958 } 1959 if (!ini->smcrv2.uses_gateway) 1960 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 1961 1962 smcr_version = ini->smcr_version; 1963 ini->smcr_version = SMC_V2; 1964 rc = smc_listen_rdma_init(new_smc, ini); 1965 if (!rc) 1966 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1967 if (!rc) 1968 return; 1969 ini->smcr_version = smcr_version; 1970 smc_find_ism_store_rc(rc, ini); 1971 1972 not_found: 1973 ini->smcr_version &= ~SMC_V2; 1974 ini->check_smcrv2 = false; 1975 } 1976 1977 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1978 struct smc_clc_msg_proposal *pclc, 1979 struct smc_init_info *ini) 1980 { 1981 int rc; 1982 1983 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 1984 return SMC_CLC_DECL_NOSMCDEV; 1985 1986 /* prepare RDMA check */ 1987 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1988 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 1989 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1990 rc = smc_find_rdma_device(new_smc, ini); 1991 if (rc) { 1992 /* no RDMA device found */ 1993 return SMC_CLC_DECL_NOSMCDEV; 1994 } 1995 rc = smc_listen_rdma_init(new_smc, ini); 1996 if (rc) 1997 return rc; 1998 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1999 } 2000 2001 /* determine the local device matching to proposal */ 2002 static int smc_listen_find_device(struct smc_sock *new_smc, 2003 struct smc_clc_msg_proposal *pclc, 2004 struct smc_init_info *ini) 2005 { 2006 int prfx_rc; 2007 2008 /* check for ISM device matching V2 proposed device */ 2009 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 2010 if (ini->ism_dev[0]) 2011 return 0; 2012 2013 /* check for matching IP prefix and subnet length (V1) */ 2014 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 2015 if (prfx_rc) 2016 smc_find_ism_store_rc(prfx_rc, ini); 2017 2018 /* get vlan id from IP device */ 2019 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 2020 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 2021 2022 /* check for ISM device matching V1 proposed device */ 2023 if (!prfx_rc) 2024 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 2025 if (ini->ism_dev[0]) 2026 return 0; 2027 2028 if (!smcr_indicated(pclc->hdr.typev1) && 2029 !smcr_indicated(pclc->hdr.typev2)) 2030 /* skip RDMA and decline */ 2031 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 2032 2033 /* check if RDMA V2 is available */ 2034 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 2035 if (ini->smcrv2.ib_dev_v2) 2036 return 0; 2037 2038 /* check if RDMA V1 is available */ 2039 if (!prfx_rc) { 2040 int rc; 2041 2042 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 2043 smc_find_ism_store_rc(rc, ini); 2044 return (!rc) ? 0 : ini->rc; 2045 } 2046 return SMC_CLC_DECL_NOSMCDEV; 2047 } 2048 2049 /* listen worker: finish RDMA setup */ 2050 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 2051 struct smc_clc_msg_accept_confirm *cclc, 2052 bool local_first, 2053 struct smc_init_info *ini) 2054 { 2055 struct smc_link *link = new_smc->conn.lnk; 2056 int reason_code = 0; 2057 2058 if (local_first) 2059 smc_link_save_peer_info(link, cclc, ini); 2060 2061 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 2062 return SMC_CLC_DECL_ERR_RTOK; 2063 2064 if (local_first) { 2065 if (smc_ib_ready_link(link)) 2066 return SMC_CLC_DECL_ERR_RDYLNK; 2067 /* QP confirmation over RoCE fabric */ 2068 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 2069 reason_code = smcr_serv_conf_first_link(new_smc); 2070 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 2071 } 2072 return reason_code; 2073 } 2074 2075 /* setup for connection of server */ 2076 static void smc_listen_work(struct work_struct *work) 2077 { 2078 struct smc_sock *new_smc = container_of(work, struct smc_sock, 2079 smc_listen_work); 2080 struct socket *newclcsock = new_smc->clcsock; 2081 struct smc_clc_msg_accept_confirm *cclc; 2082 struct smc_clc_msg_proposal_area *buf; 2083 struct smc_clc_msg_proposal *pclc; 2084 struct smc_init_info *ini = NULL; 2085 u8 proposal_version = SMC_V1; 2086 u8 accept_version; 2087 int rc = 0; 2088 2089 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 2090 return smc_listen_out_err(new_smc); 2091 2092 if (new_smc->use_fallback) { 2093 smc_listen_out_connected(new_smc); 2094 return; 2095 } 2096 2097 /* check if peer is smc capable */ 2098 if (!tcp_sk(newclcsock->sk)->syn_smc) { 2099 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 2100 if (rc) 2101 smc_listen_out_err(new_smc); 2102 else 2103 smc_listen_out_connected(new_smc); 2104 return; 2105 } 2106 2107 /* do inband token exchange - 2108 * wait for and receive SMC Proposal CLC message 2109 */ 2110 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 2111 if (!buf) { 2112 rc = SMC_CLC_DECL_MEM; 2113 goto out_decl; 2114 } 2115 pclc = (struct smc_clc_msg_proposal *)buf; 2116 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2117 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2118 if (rc) 2119 goto out_decl; 2120 2121 if (pclc->hdr.version > SMC_V1) 2122 proposal_version = SMC_V2; 2123 2124 /* IPSec connections opt out of SMC optimizations */ 2125 if (using_ipsec(new_smc)) { 2126 rc = SMC_CLC_DECL_IPSEC; 2127 goto out_decl; 2128 } 2129 2130 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2131 if (!ini) { 2132 rc = SMC_CLC_DECL_MEM; 2133 goto out_decl; 2134 } 2135 2136 /* initial version checking */ 2137 rc = smc_listen_v2_check(new_smc, pclc, ini); 2138 if (rc) 2139 goto out_decl; 2140 2141 mutex_lock(&smc_server_lgr_pending); 2142 smc_close_init(new_smc); 2143 smc_rx_init(new_smc); 2144 smc_tx_init(new_smc); 2145 2146 /* determine ISM or RoCE device used for connection */ 2147 rc = smc_listen_find_device(new_smc, pclc, ini); 2148 if (rc) 2149 goto out_unlock; 2150 2151 /* send SMC Accept CLC message */ 2152 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2153 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2154 accept_version, ini->negotiated_eid); 2155 if (rc) 2156 goto out_unlock; 2157 2158 /* SMC-D does not need this lock any more */ 2159 if (ini->is_smcd) 2160 mutex_unlock(&smc_server_lgr_pending); 2161 2162 /* receive SMC Confirm CLC message */ 2163 memset(buf, 0, sizeof(*buf)); 2164 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2165 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2166 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2167 if (rc) { 2168 if (!ini->is_smcd) 2169 goto out_unlock; 2170 goto out_decl; 2171 } 2172 2173 /* finish worker */ 2174 if (!ini->is_smcd) { 2175 rc = smc_listen_rdma_finish(new_smc, cclc, 2176 ini->first_contact_local, ini); 2177 if (rc) 2178 goto out_unlock; 2179 mutex_unlock(&smc_server_lgr_pending); 2180 } 2181 smc_conn_save_peer_info(new_smc, cclc); 2182 smc_listen_out_connected(new_smc); 2183 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2184 goto out_free; 2185 2186 out_unlock: 2187 mutex_unlock(&smc_server_lgr_pending); 2188 out_decl: 2189 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2190 proposal_version); 2191 out_free: 2192 kfree(ini); 2193 kfree(buf); 2194 } 2195 2196 static void smc_tcp_listen_work(struct work_struct *work) 2197 { 2198 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2199 tcp_listen_work); 2200 struct sock *lsk = &lsmc->sk; 2201 struct smc_sock *new_smc; 2202 int rc = 0; 2203 2204 lock_sock(lsk); 2205 while (lsk->sk_state == SMC_LISTEN) { 2206 rc = smc_clcsock_accept(lsmc, &new_smc); 2207 if (rc) /* clcsock accept queue empty or error */ 2208 goto out; 2209 if (!new_smc) 2210 continue; 2211 2212 new_smc->listen_smc = lsmc; 2213 new_smc->use_fallback = lsmc->use_fallback; 2214 new_smc->fallback_rsn = lsmc->fallback_rsn; 2215 sock_hold(lsk); /* sock_put in smc_listen_work */ 2216 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2217 smc_copy_sock_settings_to_smc(new_smc); 2218 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 2219 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 2220 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2221 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2222 sock_put(&new_smc->sk); 2223 } 2224 2225 out: 2226 release_sock(lsk); 2227 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2228 } 2229 2230 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2231 { 2232 struct smc_sock *lsmc = 2233 smc_clcsock_user_data(listen_clcsock); 2234 2235 if (!lsmc) 2236 return; 2237 lsmc->clcsk_data_ready(listen_clcsock); 2238 if (lsmc->sk.sk_state == SMC_LISTEN) { 2239 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2240 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 2241 sock_put(&lsmc->sk); 2242 } 2243 } 2244 2245 static int smc_listen(struct socket *sock, int backlog) 2246 { 2247 struct sock *sk = sock->sk; 2248 struct smc_sock *smc; 2249 int rc; 2250 2251 smc = smc_sk(sk); 2252 lock_sock(sk); 2253 2254 rc = -EINVAL; 2255 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2256 smc->connect_nonblock) 2257 goto out; 2258 2259 rc = 0; 2260 if (sk->sk_state == SMC_LISTEN) { 2261 sk->sk_max_ack_backlog = backlog; 2262 goto out; 2263 } 2264 /* some socket options are handled in core, so we could not apply 2265 * them to the clc socket -- copy smc socket options to clc socket 2266 */ 2267 smc_copy_sock_settings_to_clc(smc); 2268 if (!smc->use_fallback) 2269 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2270 2271 /* save original sk_data_ready function and establish 2272 * smc-specific sk_data_ready function 2273 */ 2274 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 2275 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 2276 smc->clcsock->sk->sk_user_data = 2277 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2278 rc = kernel_listen(smc->clcsock, backlog); 2279 if (rc) { 2280 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready; 2281 goto out; 2282 } 2283 sk->sk_max_ack_backlog = backlog; 2284 sk->sk_ack_backlog = 0; 2285 sk->sk_state = SMC_LISTEN; 2286 2287 out: 2288 release_sock(sk); 2289 return rc; 2290 } 2291 2292 static int smc_accept(struct socket *sock, struct socket *new_sock, 2293 int flags, bool kern) 2294 { 2295 struct sock *sk = sock->sk, *nsk; 2296 DECLARE_WAITQUEUE(wait, current); 2297 struct smc_sock *lsmc; 2298 long timeo; 2299 int rc = 0; 2300 2301 lsmc = smc_sk(sk); 2302 sock_hold(sk); /* sock_put below */ 2303 lock_sock(sk); 2304 2305 if (lsmc->sk.sk_state != SMC_LISTEN) { 2306 rc = -EINVAL; 2307 release_sock(sk); 2308 goto out; 2309 } 2310 2311 /* Wait for an incoming connection */ 2312 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2313 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2314 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2315 set_current_state(TASK_INTERRUPTIBLE); 2316 if (!timeo) { 2317 rc = -EAGAIN; 2318 break; 2319 } 2320 release_sock(sk); 2321 timeo = schedule_timeout(timeo); 2322 /* wakeup by sk_data_ready in smc_listen_work() */ 2323 sched_annotate_sleep(); 2324 lock_sock(sk); 2325 if (signal_pending(current)) { 2326 rc = sock_intr_errno(timeo); 2327 break; 2328 } 2329 } 2330 set_current_state(TASK_RUNNING); 2331 remove_wait_queue(sk_sleep(sk), &wait); 2332 2333 if (!rc) 2334 rc = sock_error(nsk); 2335 release_sock(sk); 2336 if (rc) 2337 goto out; 2338 2339 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 2340 /* wait till data arrives on the socket */ 2341 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 2342 MSEC_PER_SEC); 2343 if (smc_sk(nsk)->use_fallback) { 2344 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2345 2346 lock_sock(clcsk); 2347 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2348 sk_wait_data(clcsk, &timeo, NULL); 2349 release_sock(clcsk); 2350 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2351 lock_sock(nsk); 2352 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 2353 release_sock(nsk); 2354 } 2355 } 2356 2357 out: 2358 sock_put(sk); /* sock_hold above */ 2359 return rc; 2360 } 2361 2362 static int smc_getname(struct socket *sock, struct sockaddr *addr, 2363 int peer) 2364 { 2365 struct smc_sock *smc; 2366 2367 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2368 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2369 return -ENOTCONN; 2370 2371 smc = smc_sk(sock->sk); 2372 2373 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2374 } 2375 2376 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2377 { 2378 struct sock *sk = sock->sk; 2379 struct smc_sock *smc; 2380 int rc = -EPIPE; 2381 2382 smc = smc_sk(sk); 2383 lock_sock(sk); 2384 if ((sk->sk_state != SMC_ACTIVE) && 2385 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2386 (sk->sk_state != SMC_INIT)) 2387 goto out; 2388 2389 if (msg->msg_flags & MSG_FASTOPEN) { 2390 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2391 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2392 if (rc) 2393 goto out; 2394 } else { 2395 rc = -EINVAL; 2396 goto out; 2397 } 2398 } 2399 2400 if (smc->use_fallback) { 2401 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2402 } else { 2403 rc = smc_tx_sendmsg(smc, msg, len); 2404 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2405 } 2406 out: 2407 release_sock(sk); 2408 return rc; 2409 } 2410 2411 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2412 int flags) 2413 { 2414 struct sock *sk = sock->sk; 2415 struct smc_sock *smc; 2416 int rc = -ENOTCONN; 2417 2418 smc = smc_sk(sk); 2419 lock_sock(sk); 2420 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2421 /* socket was connected before, no more data to read */ 2422 rc = 0; 2423 goto out; 2424 } 2425 if ((sk->sk_state == SMC_INIT) || 2426 (sk->sk_state == SMC_LISTEN) || 2427 (sk->sk_state == SMC_CLOSED)) 2428 goto out; 2429 2430 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2431 rc = 0; 2432 goto out; 2433 } 2434 2435 if (smc->use_fallback) { 2436 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2437 } else { 2438 msg->msg_namelen = 0; 2439 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2440 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2441 } 2442 2443 out: 2444 release_sock(sk); 2445 return rc; 2446 } 2447 2448 static __poll_t smc_accept_poll(struct sock *parent) 2449 { 2450 struct smc_sock *isk = smc_sk(parent); 2451 __poll_t mask = 0; 2452 2453 spin_lock(&isk->accept_q_lock); 2454 if (!list_empty(&isk->accept_q)) 2455 mask = EPOLLIN | EPOLLRDNORM; 2456 spin_unlock(&isk->accept_q_lock); 2457 2458 return mask; 2459 } 2460 2461 static __poll_t smc_poll(struct file *file, struct socket *sock, 2462 poll_table *wait) 2463 { 2464 struct sock *sk = sock->sk; 2465 struct smc_sock *smc; 2466 __poll_t mask = 0; 2467 2468 if (!sk) 2469 return EPOLLNVAL; 2470 2471 smc = smc_sk(sock->sk); 2472 if (smc->use_fallback) { 2473 /* delegate to CLC child sock */ 2474 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2475 sk->sk_err = smc->clcsock->sk->sk_err; 2476 } else { 2477 if (sk->sk_state != SMC_CLOSED) 2478 sock_poll_wait(file, sock, wait); 2479 if (sk->sk_err) 2480 mask |= EPOLLERR; 2481 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2482 (sk->sk_state == SMC_CLOSED)) 2483 mask |= EPOLLHUP; 2484 if (sk->sk_state == SMC_LISTEN) { 2485 /* woken up by sk_data_ready in smc_listen_work() */ 2486 mask |= smc_accept_poll(sk); 2487 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2488 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2489 wait); 2490 sk->sk_err = smc->clcsock->sk->sk_err; 2491 } else { 2492 if ((sk->sk_state != SMC_INIT && 2493 atomic_read(&smc->conn.sndbuf_space)) || 2494 sk->sk_shutdown & SEND_SHUTDOWN) { 2495 mask |= EPOLLOUT | EPOLLWRNORM; 2496 } else { 2497 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2498 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2499 } 2500 if (atomic_read(&smc->conn.bytes_to_rcv)) 2501 mask |= EPOLLIN | EPOLLRDNORM; 2502 if (sk->sk_shutdown & RCV_SHUTDOWN) 2503 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2504 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2505 mask |= EPOLLIN; 2506 if (smc->conn.urg_state == SMC_URG_VALID) 2507 mask |= EPOLLPRI; 2508 } 2509 } 2510 2511 return mask; 2512 } 2513 2514 static int smc_shutdown(struct socket *sock, int how) 2515 { 2516 struct sock *sk = sock->sk; 2517 bool do_shutdown = true; 2518 struct smc_sock *smc; 2519 int rc = -EINVAL; 2520 int old_state; 2521 int rc1 = 0; 2522 2523 smc = smc_sk(sk); 2524 2525 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2526 return rc; 2527 2528 lock_sock(sk); 2529 2530 rc = -ENOTCONN; 2531 if ((sk->sk_state != SMC_ACTIVE) && 2532 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2533 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2534 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2535 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2536 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2537 goto out; 2538 if (smc->use_fallback) { 2539 rc = kernel_sock_shutdown(smc->clcsock, how); 2540 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2541 if (sk->sk_shutdown == SHUTDOWN_MASK) 2542 sk->sk_state = SMC_CLOSED; 2543 goto out; 2544 } 2545 switch (how) { 2546 case SHUT_RDWR: /* shutdown in both directions */ 2547 old_state = sk->sk_state; 2548 rc = smc_close_active(smc); 2549 if (old_state == SMC_ACTIVE && 2550 sk->sk_state == SMC_PEERCLOSEWAIT1) 2551 do_shutdown = false; 2552 break; 2553 case SHUT_WR: 2554 rc = smc_close_shutdown_write(smc); 2555 break; 2556 case SHUT_RD: 2557 rc = 0; 2558 /* nothing more to do because peer is not involved */ 2559 break; 2560 } 2561 if (do_shutdown && smc->clcsock) 2562 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2563 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2564 sk->sk_shutdown |= how + 1; 2565 2566 out: 2567 release_sock(sk); 2568 return rc ? rc : rc1; 2569 } 2570 2571 static int smc_setsockopt(struct socket *sock, int level, int optname, 2572 sockptr_t optval, unsigned int optlen) 2573 { 2574 struct sock *sk = sock->sk; 2575 struct smc_sock *smc; 2576 int val, rc; 2577 2578 if (level == SOL_TCP && optname == TCP_ULP) 2579 return -EOPNOTSUPP; 2580 2581 smc = smc_sk(sk); 2582 2583 /* generic setsockopts reaching us here always apply to the 2584 * CLC socket 2585 */ 2586 mutex_lock(&smc->clcsock_release_lock); 2587 if (!smc->clcsock) { 2588 mutex_unlock(&smc->clcsock_release_lock); 2589 return -EBADF; 2590 } 2591 if (unlikely(!smc->clcsock->ops->setsockopt)) 2592 rc = -EOPNOTSUPP; 2593 else 2594 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2595 optval, optlen); 2596 if (smc->clcsock->sk->sk_err) { 2597 sk->sk_err = smc->clcsock->sk->sk_err; 2598 sk_error_report(sk); 2599 } 2600 mutex_unlock(&smc->clcsock_release_lock); 2601 2602 if (optlen < sizeof(int)) 2603 return -EINVAL; 2604 if (copy_from_sockptr(&val, optval, sizeof(int))) 2605 return -EFAULT; 2606 2607 lock_sock(sk); 2608 if (rc || smc->use_fallback) 2609 goto out; 2610 switch (optname) { 2611 case TCP_FASTOPEN: 2612 case TCP_FASTOPEN_CONNECT: 2613 case TCP_FASTOPEN_KEY: 2614 case TCP_FASTOPEN_NO_COOKIE: 2615 /* option not supported by SMC */ 2616 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2617 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2618 } else { 2619 rc = -EINVAL; 2620 } 2621 break; 2622 case TCP_NODELAY: 2623 if (sk->sk_state != SMC_INIT && 2624 sk->sk_state != SMC_LISTEN && 2625 sk->sk_state != SMC_CLOSED) { 2626 if (val) { 2627 SMC_STAT_INC(smc, ndly_cnt); 2628 mod_delayed_work(smc->conn.lgr->tx_wq, 2629 &smc->conn.tx_work, 0); 2630 } 2631 } 2632 break; 2633 case TCP_CORK: 2634 if (sk->sk_state != SMC_INIT && 2635 sk->sk_state != SMC_LISTEN && 2636 sk->sk_state != SMC_CLOSED) { 2637 if (!val) { 2638 SMC_STAT_INC(smc, cork_cnt); 2639 mod_delayed_work(smc->conn.lgr->tx_wq, 2640 &smc->conn.tx_work, 0); 2641 } 2642 } 2643 break; 2644 case TCP_DEFER_ACCEPT: 2645 smc->sockopt_defer_accept = val; 2646 break; 2647 default: 2648 break; 2649 } 2650 out: 2651 release_sock(sk); 2652 2653 return rc; 2654 } 2655 2656 static int smc_getsockopt(struct socket *sock, int level, int optname, 2657 char __user *optval, int __user *optlen) 2658 { 2659 struct smc_sock *smc; 2660 int rc; 2661 2662 smc = smc_sk(sock->sk); 2663 mutex_lock(&smc->clcsock_release_lock); 2664 if (!smc->clcsock) { 2665 mutex_unlock(&smc->clcsock_release_lock); 2666 return -EBADF; 2667 } 2668 /* socket options apply to the CLC socket */ 2669 if (unlikely(!smc->clcsock->ops->getsockopt)) { 2670 mutex_unlock(&smc->clcsock_release_lock); 2671 return -EOPNOTSUPP; 2672 } 2673 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2674 optval, optlen); 2675 mutex_unlock(&smc->clcsock_release_lock); 2676 return rc; 2677 } 2678 2679 static int smc_ioctl(struct socket *sock, unsigned int cmd, 2680 unsigned long arg) 2681 { 2682 union smc_host_cursor cons, urg; 2683 struct smc_connection *conn; 2684 struct smc_sock *smc; 2685 int answ; 2686 2687 smc = smc_sk(sock->sk); 2688 conn = &smc->conn; 2689 lock_sock(&smc->sk); 2690 if (smc->use_fallback) { 2691 if (!smc->clcsock) { 2692 release_sock(&smc->sk); 2693 return -EBADF; 2694 } 2695 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2696 release_sock(&smc->sk); 2697 return answ; 2698 } 2699 switch (cmd) { 2700 case SIOCINQ: /* same as FIONREAD */ 2701 if (smc->sk.sk_state == SMC_LISTEN) { 2702 release_sock(&smc->sk); 2703 return -EINVAL; 2704 } 2705 if (smc->sk.sk_state == SMC_INIT || 2706 smc->sk.sk_state == SMC_CLOSED) 2707 answ = 0; 2708 else 2709 answ = atomic_read(&smc->conn.bytes_to_rcv); 2710 break; 2711 case SIOCOUTQ: 2712 /* output queue size (not send + not acked) */ 2713 if (smc->sk.sk_state == SMC_LISTEN) { 2714 release_sock(&smc->sk); 2715 return -EINVAL; 2716 } 2717 if (smc->sk.sk_state == SMC_INIT || 2718 smc->sk.sk_state == SMC_CLOSED) 2719 answ = 0; 2720 else 2721 answ = smc->conn.sndbuf_desc->len - 2722 atomic_read(&smc->conn.sndbuf_space); 2723 break; 2724 case SIOCOUTQNSD: 2725 /* output queue size (not send only) */ 2726 if (smc->sk.sk_state == SMC_LISTEN) { 2727 release_sock(&smc->sk); 2728 return -EINVAL; 2729 } 2730 if (smc->sk.sk_state == SMC_INIT || 2731 smc->sk.sk_state == SMC_CLOSED) 2732 answ = 0; 2733 else 2734 answ = smc_tx_prepared_sends(&smc->conn); 2735 break; 2736 case SIOCATMARK: 2737 if (smc->sk.sk_state == SMC_LISTEN) { 2738 release_sock(&smc->sk); 2739 return -EINVAL; 2740 } 2741 if (smc->sk.sk_state == SMC_INIT || 2742 smc->sk.sk_state == SMC_CLOSED) { 2743 answ = 0; 2744 } else { 2745 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2746 smc_curs_copy(&urg, &conn->urg_curs, conn); 2747 answ = smc_curs_diff(conn->rmb_desc->len, 2748 &cons, &urg) == 1; 2749 } 2750 break; 2751 default: 2752 release_sock(&smc->sk); 2753 return -ENOIOCTLCMD; 2754 } 2755 release_sock(&smc->sk); 2756 2757 return put_user(answ, (int __user *)arg); 2758 } 2759 2760 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2761 int offset, size_t size, int flags) 2762 { 2763 struct sock *sk = sock->sk; 2764 struct smc_sock *smc; 2765 int rc = -EPIPE; 2766 2767 smc = smc_sk(sk); 2768 lock_sock(sk); 2769 if (sk->sk_state != SMC_ACTIVE) { 2770 release_sock(sk); 2771 goto out; 2772 } 2773 release_sock(sk); 2774 if (smc->use_fallback) { 2775 rc = kernel_sendpage(smc->clcsock, page, offset, 2776 size, flags); 2777 } else { 2778 SMC_STAT_INC(smc, sendpage_cnt); 2779 rc = sock_no_sendpage(sock, page, offset, size, flags); 2780 } 2781 2782 out: 2783 return rc; 2784 } 2785 2786 /* Map the affected portions of the rmbe into an spd, note the number of bytes 2787 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2788 * updates till whenever a respective page has been fully processed. 2789 * Note that subsequent recv() calls have to wait till all splice() processing 2790 * completed. 2791 */ 2792 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2793 struct pipe_inode_info *pipe, size_t len, 2794 unsigned int flags) 2795 { 2796 struct sock *sk = sock->sk; 2797 struct smc_sock *smc; 2798 int rc = -ENOTCONN; 2799 2800 smc = smc_sk(sk); 2801 lock_sock(sk); 2802 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2803 /* socket was connected before, no more data to read */ 2804 rc = 0; 2805 goto out; 2806 } 2807 if (sk->sk_state == SMC_INIT || 2808 sk->sk_state == SMC_LISTEN || 2809 sk->sk_state == SMC_CLOSED) 2810 goto out; 2811 2812 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2813 rc = 0; 2814 goto out; 2815 } 2816 2817 if (smc->use_fallback) { 2818 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2819 pipe, len, flags); 2820 } else { 2821 if (*ppos) { 2822 rc = -ESPIPE; 2823 goto out; 2824 } 2825 if (flags & SPLICE_F_NONBLOCK) 2826 flags = MSG_DONTWAIT; 2827 else 2828 flags = 0; 2829 SMC_STAT_INC(smc, splice_cnt); 2830 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2831 } 2832 out: 2833 release_sock(sk); 2834 2835 return rc; 2836 } 2837 2838 /* must look like tcp */ 2839 static const struct proto_ops smc_sock_ops = { 2840 .family = PF_SMC, 2841 .owner = THIS_MODULE, 2842 .release = smc_release, 2843 .bind = smc_bind, 2844 .connect = smc_connect, 2845 .socketpair = sock_no_socketpair, 2846 .accept = smc_accept, 2847 .getname = smc_getname, 2848 .poll = smc_poll, 2849 .ioctl = smc_ioctl, 2850 .listen = smc_listen, 2851 .shutdown = smc_shutdown, 2852 .setsockopt = smc_setsockopt, 2853 .getsockopt = smc_getsockopt, 2854 .sendmsg = smc_sendmsg, 2855 .recvmsg = smc_recvmsg, 2856 .mmap = sock_no_mmap, 2857 .sendpage = smc_sendpage, 2858 .splice_read = smc_splice_read, 2859 }; 2860 2861 static int __smc_create(struct net *net, struct socket *sock, int protocol, 2862 int kern, struct socket *clcsock) 2863 { 2864 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2865 struct smc_sock *smc; 2866 struct sock *sk; 2867 int rc; 2868 2869 rc = -ESOCKTNOSUPPORT; 2870 if (sock->type != SOCK_STREAM) 2871 goto out; 2872 2873 rc = -EPROTONOSUPPORT; 2874 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2875 goto out; 2876 2877 rc = -ENOBUFS; 2878 sock->ops = &smc_sock_ops; 2879 sk = smc_sock_alloc(net, sock, protocol); 2880 if (!sk) 2881 goto out; 2882 2883 /* create internal TCP socket for CLC handshake and fallback */ 2884 smc = smc_sk(sk); 2885 smc->use_fallback = false; /* assume rdma capability first */ 2886 smc->fallback_rsn = 0; 2887 2888 rc = 0; 2889 if (!clcsock) { 2890 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2891 &smc->clcsock); 2892 if (rc) { 2893 sk_common_release(sk); 2894 goto out; 2895 } 2896 } else { 2897 smc->clcsock = clcsock; 2898 } 2899 2900 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2901 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2902 2903 out: 2904 return rc; 2905 } 2906 2907 static int smc_create(struct net *net, struct socket *sock, int protocol, 2908 int kern) 2909 { 2910 return __smc_create(net, sock, protocol, kern, NULL); 2911 } 2912 2913 static const struct net_proto_family smc_sock_family_ops = { 2914 .family = PF_SMC, 2915 .owner = THIS_MODULE, 2916 .create = smc_create, 2917 }; 2918 2919 static int smc_ulp_init(struct sock *sk) 2920 { 2921 struct socket *tcp = sk->sk_socket; 2922 struct net *net = sock_net(sk); 2923 struct socket *smcsock; 2924 int protocol, ret; 2925 2926 /* only TCP can be replaced */ 2927 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 2928 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 2929 return -ESOCKTNOSUPPORT; 2930 /* don't handle wq now */ 2931 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 2932 return -ENOTCONN; 2933 2934 if (sk->sk_family == AF_INET) 2935 protocol = SMCPROTO_SMC; 2936 else 2937 protocol = SMCPROTO_SMC6; 2938 2939 smcsock = sock_alloc(); 2940 if (!smcsock) 2941 return -ENFILE; 2942 2943 smcsock->type = SOCK_STREAM; 2944 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 2945 ret = __smc_create(net, smcsock, protocol, 1, tcp); 2946 if (ret) { 2947 sock_release(smcsock); /* module_put() which ops won't be NULL */ 2948 return ret; 2949 } 2950 2951 /* replace tcp socket to smc */ 2952 smcsock->file = tcp->file; 2953 smcsock->file->private_data = smcsock; 2954 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 2955 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 2956 tcp->file = NULL; 2957 2958 return ret; 2959 } 2960 2961 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 2962 const gfp_t priority) 2963 { 2964 struct inet_connection_sock *icsk = inet_csk(newsk); 2965 2966 /* don't inherit ulp ops to child when listen */ 2967 icsk->icsk_ulp_ops = NULL; 2968 } 2969 2970 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 2971 .name = "smc", 2972 .owner = THIS_MODULE, 2973 .init = smc_ulp_init, 2974 .clone = smc_ulp_clone, 2975 }; 2976 2977 unsigned int smc_net_id; 2978 2979 static __net_init int smc_net_init(struct net *net) 2980 { 2981 return smc_pnet_net_init(net); 2982 } 2983 2984 static void __net_exit smc_net_exit(struct net *net) 2985 { 2986 smc_pnet_net_exit(net); 2987 } 2988 2989 static __net_init int smc_net_stat_init(struct net *net) 2990 { 2991 return smc_stats_init(net); 2992 } 2993 2994 static void __net_exit smc_net_stat_exit(struct net *net) 2995 { 2996 smc_stats_exit(net); 2997 } 2998 2999 static struct pernet_operations smc_net_ops = { 3000 .init = smc_net_init, 3001 .exit = smc_net_exit, 3002 .id = &smc_net_id, 3003 .size = sizeof(struct smc_net), 3004 }; 3005 3006 static struct pernet_operations smc_net_stat_ops = { 3007 .init = smc_net_stat_init, 3008 .exit = smc_net_stat_exit, 3009 }; 3010 3011 static int __init smc_init(void) 3012 { 3013 int rc; 3014 3015 rc = register_pernet_subsys(&smc_net_ops); 3016 if (rc) 3017 return rc; 3018 3019 rc = register_pernet_subsys(&smc_net_stat_ops); 3020 if (rc) 3021 return rc; 3022 3023 smc_ism_init(); 3024 smc_clc_init(); 3025 3026 rc = smc_nl_init(); 3027 if (rc) 3028 goto out_pernet_subsys; 3029 3030 rc = smc_pnet_init(); 3031 if (rc) 3032 goto out_nl; 3033 3034 rc = -ENOMEM; 3035 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 3036 if (!smc_hs_wq) 3037 goto out_pnet; 3038 3039 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 3040 if (!smc_close_wq) 3041 goto out_alloc_hs_wq; 3042 3043 rc = smc_core_init(); 3044 if (rc) { 3045 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 3046 goto out_alloc_wqs; 3047 } 3048 3049 rc = smc_llc_init(); 3050 if (rc) { 3051 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 3052 goto out_core; 3053 } 3054 3055 rc = smc_cdc_init(); 3056 if (rc) { 3057 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 3058 goto out_core; 3059 } 3060 3061 rc = proto_register(&smc_proto, 1); 3062 if (rc) { 3063 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 3064 goto out_core; 3065 } 3066 3067 rc = proto_register(&smc_proto6, 1); 3068 if (rc) { 3069 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 3070 goto out_proto; 3071 } 3072 3073 rc = sock_register(&smc_sock_family_ops); 3074 if (rc) { 3075 pr_err("%s: sock_register fails with %d\n", __func__, rc); 3076 goto out_proto6; 3077 } 3078 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 3079 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 3080 3081 rc = smc_ib_register_client(); 3082 if (rc) { 3083 pr_err("%s: ib_register fails with %d\n", __func__, rc); 3084 goto out_sock; 3085 } 3086 3087 rc = tcp_register_ulp(&smc_ulp_ops); 3088 if (rc) { 3089 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 3090 goto out_ib; 3091 } 3092 3093 static_branch_enable(&tcp_have_smc); 3094 return 0; 3095 3096 out_ib: 3097 smc_ib_unregister_client(); 3098 out_sock: 3099 sock_unregister(PF_SMC); 3100 out_proto6: 3101 proto_unregister(&smc_proto6); 3102 out_proto: 3103 proto_unregister(&smc_proto); 3104 out_core: 3105 smc_core_exit(); 3106 out_alloc_wqs: 3107 destroy_workqueue(smc_close_wq); 3108 out_alloc_hs_wq: 3109 destroy_workqueue(smc_hs_wq); 3110 out_pnet: 3111 smc_pnet_exit(); 3112 out_nl: 3113 smc_nl_exit(); 3114 out_pernet_subsys: 3115 unregister_pernet_subsys(&smc_net_ops); 3116 3117 return rc; 3118 } 3119 3120 static void __exit smc_exit(void) 3121 { 3122 static_branch_disable(&tcp_have_smc); 3123 tcp_unregister_ulp(&smc_ulp_ops); 3124 sock_unregister(PF_SMC); 3125 smc_core_exit(); 3126 smc_ib_unregister_client(); 3127 destroy_workqueue(smc_close_wq); 3128 destroy_workqueue(smc_hs_wq); 3129 proto_unregister(&smc_proto6); 3130 proto_unregister(&smc_proto); 3131 smc_pnet_exit(); 3132 smc_nl_exit(); 3133 smc_clc_exit(); 3134 unregister_pernet_subsys(&smc_net_stat_ops); 3135 unregister_pernet_subsys(&smc_net_ops); 3136 rcu_barrier(); 3137 } 3138 3139 module_init(smc_init); 3140 module_exit(smc_exit); 3141 3142 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3143 MODULE_DESCRIPTION("smc socket address family"); 3144 MODULE_LICENSE("GPL"); 3145 MODULE_ALIAS_NETPROTO(PF_SMC); 3146 MODULE_ALIAS_TCP_ULP("smc"); 3147