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