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_tx.h" 49 #include "smc_rx.h" 50 #include "smc_close.h" 51 52 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group 53 * creation on server 54 */ 55 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group 56 * creation on client 57 */ 58 59 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ 60 struct workqueue_struct *smc_close_wq; /* wq for close work */ 61 62 static void smc_tcp_listen_work(struct work_struct *); 63 static void smc_connect_work(struct work_struct *); 64 65 static void smc_set_keepalive(struct sock *sk, int val) 66 { 67 struct smc_sock *smc = smc_sk(sk); 68 69 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 70 } 71 72 static struct smc_hashinfo smc_v4_hashinfo = { 73 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 74 }; 75 76 static struct smc_hashinfo smc_v6_hashinfo = { 77 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 78 }; 79 80 int smc_hash_sk(struct sock *sk) 81 { 82 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 83 struct hlist_head *head; 84 85 head = &h->ht; 86 87 write_lock_bh(&h->lock); 88 sk_add_node(sk, head); 89 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 90 write_unlock_bh(&h->lock); 91 92 return 0; 93 } 94 EXPORT_SYMBOL_GPL(smc_hash_sk); 95 96 void smc_unhash_sk(struct sock *sk) 97 { 98 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 99 100 write_lock_bh(&h->lock); 101 if (sk_del_node_init(sk)) 102 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 103 write_unlock_bh(&h->lock); 104 } 105 EXPORT_SYMBOL_GPL(smc_unhash_sk); 106 107 struct proto smc_proto = { 108 .name = "SMC", 109 .owner = THIS_MODULE, 110 .keepalive = smc_set_keepalive, 111 .hash = smc_hash_sk, 112 .unhash = smc_unhash_sk, 113 .obj_size = sizeof(struct smc_sock), 114 .h.smc_hash = &smc_v4_hashinfo, 115 .slab_flags = SLAB_TYPESAFE_BY_RCU, 116 }; 117 EXPORT_SYMBOL_GPL(smc_proto); 118 119 struct proto smc_proto6 = { 120 .name = "SMC6", 121 .owner = THIS_MODULE, 122 .keepalive = smc_set_keepalive, 123 .hash = smc_hash_sk, 124 .unhash = smc_unhash_sk, 125 .obj_size = sizeof(struct smc_sock), 126 .h.smc_hash = &smc_v6_hashinfo, 127 .slab_flags = SLAB_TYPESAFE_BY_RCU, 128 }; 129 EXPORT_SYMBOL_GPL(smc_proto6); 130 131 static void smc_restore_fallback_changes(struct smc_sock *smc) 132 { 133 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ 134 smc->clcsock->file->private_data = smc->sk.sk_socket; 135 smc->clcsock->file = NULL; 136 } 137 } 138 139 static int __smc_release(struct smc_sock *smc) 140 { 141 struct sock *sk = &smc->sk; 142 int rc = 0; 143 144 if (!smc->use_fallback) { 145 rc = smc_close_active(smc); 146 sock_set_flag(sk, SOCK_DEAD); 147 sk->sk_shutdown |= SHUTDOWN_MASK; 148 } else { 149 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT) 150 sock_put(sk); /* passive closing */ 151 if (sk->sk_state == SMC_LISTEN) { 152 /* wake up clcsock accept */ 153 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); 154 } 155 sk->sk_state = SMC_CLOSED; 156 sk->sk_state_change(sk); 157 smc_restore_fallback_changes(smc); 158 } 159 160 sk->sk_prot->unhash(sk); 161 162 if (sk->sk_state == SMC_CLOSED) { 163 if (smc->clcsock) { 164 release_sock(sk); 165 smc_clcsock_release(smc); 166 lock_sock(sk); 167 } 168 if (!smc->use_fallback) 169 smc_conn_free(&smc->conn); 170 } 171 172 return rc; 173 } 174 175 static int smc_release(struct socket *sock) 176 { 177 struct sock *sk = sock->sk; 178 struct smc_sock *smc; 179 int rc = 0; 180 181 if (!sk) 182 goto out; 183 184 sock_hold(sk); /* sock_put below */ 185 smc = smc_sk(sk); 186 187 /* cleanup for a dangling non-blocking connect */ 188 if (smc->connect_nonblock && sk->sk_state == SMC_INIT) 189 tcp_abort(smc->clcsock->sk, ECONNABORTED); 190 flush_work(&smc->connect_work); 191 192 if (sk->sk_state == SMC_LISTEN) 193 /* smc_close_non_accepted() is called and acquires 194 * sock lock for child sockets again 195 */ 196 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 197 else 198 lock_sock(sk); 199 200 rc = __smc_release(smc); 201 202 /* detach socket */ 203 sock_orphan(sk); 204 sock->sk = NULL; 205 release_sock(sk); 206 207 sock_put(sk); /* sock_hold above */ 208 sock_put(sk); /* final sock_put */ 209 out: 210 return rc; 211 } 212 213 static void smc_destruct(struct sock *sk) 214 { 215 if (sk->sk_state != SMC_CLOSED) 216 return; 217 if (!sock_flag(sk, SOCK_DEAD)) 218 return; 219 220 sk_refcnt_debug_dec(sk); 221 } 222 223 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 224 int protocol) 225 { 226 struct smc_sock *smc; 227 struct proto *prot; 228 struct sock *sk; 229 230 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 231 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 232 if (!sk) 233 return NULL; 234 235 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 236 sk->sk_state = SMC_INIT; 237 sk->sk_destruct = smc_destruct; 238 sk->sk_protocol = protocol; 239 smc = smc_sk(sk); 240 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 241 INIT_WORK(&smc->connect_work, smc_connect_work); 242 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 243 INIT_LIST_HEAD(&smc->accept_q); 244 spin_lock_init(&smc->accept_q_lock); 245 spin_lock_init(&smc->conn.send_lock); 246 sk->sk_prot->hash(sk); 247 sk_refcnt_debug_inc(sk); 248 mutex_init(&smc->clcsock_release_lock); 249 250 return sk; 251 } 252 253 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 254 int addr_len) 255 { 256 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 257 struct sock *sk = sock->sk; 258 struct smc_sock *smc; 259 int rc; 260 261 smc = smc_sk(sk); 262 263 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 264 rc = -EINVAL; 265 if (addr_len < sizeof(struct sockaddr_in)) 266 goto out; 267 268 rc = -EAFNOSUPPORT; 269 if (addr->sin_family != AF_INET && 270 addr->sin_family != AF_INET6 && 271 addr->sin_family != AF_UNSPEC) 272 goto out; 273 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 274 if (addr->sin_family == AF_UNSPEC && 275 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 276 goto out; 277 278 lock_sock(sk); 279 280 /* Check if socket is already active */ 281 rc = -EINVAL; 282 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 283 goto out_rel; 284 285 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 286 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 287 288 out_rel: 289 release_sock(sk); 290 out: 291 return rc; 292 } 293 294 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 295 unsigned long mask) 296 { 297 /* options we don't get control via setsockopt for */ 298 nsk->sk_type = osk->sk_type; 299 nsk->sk_sndbuf = osk->sk_sndbuf; 300 nsk->sk_rcvbuf = osk->sk_rcvbuf; 301 nsk->sk_sndtimeo = osk->sk_sndtimeo; 302 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 303 nsk->sk_mark = osk->sk_mark; 304 nsk->sk_priority = osk->sk_priority; 305 nsk->sk_rcvlowat = osk->sk_rcvlowat; 306 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 307 nsk->sk_err = osk->sk_err; 308 309 nsk->sk_flags &= ~mask; 310 nsk->sk_flags |= osk->sk_flags & mask; 311 } 312 313 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 314 (1UL << SOCK_KEEPOPEN) | \ 315 (1UL << SOCK_LINGER) | \ 316 (1UL << SOCK_BROADCAST) | \ 317 (1UL << SOCK_TIMESTAMP) | \ 318 (1UL << SOCK_DBG) | \ 319 (1UL << SOCK_RCVTSTAMP) | \ 320 (1UL << SOCK_RCVTSTAMPNS) | \ 321 (1UL << SOCK_LOCALROUTE) | \ 322 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 323 (1UL << SOCK_RXQ_OVFL) | \ 324 (1UL << SOCK_WIFI_STATUS) | \ 325 (1UL << SOCK_NOFCS) | \ 326 (1UL << SOCK_FILTER_LOCKED) | \ 327 (1UL << SOCK_TSTAMP_NEW)) 328 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 329 * clc socket (since smc is not called for these options from net/core) 330 */ 331 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 332 { 333 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 334 } 335 336 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 337 (1UL << SOCK_KEEPOPEN) | \ 338 (1UL << SOCK_LINGER) | \ 339 (1UL << SOCK_DBG)) 340 /* copy only settings and flags relevant for smc from clc to smc socket */ 341 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 342 { 343 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 344 } 345 346 /* register the new rmb on all links */ 347 static int smcr_lgr_reg_rmbs(struct smc_link *link, 348 struct smc_buf_desc *rmb_desc) 349 { 350 struct smc_link_group *lgr = link->lgr; 351 int i, rc = 0; 352 353 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 354 if (rc) 355 return rc; 356 /* protect against parallel smc_llc_cli_rkey_exchange() and 357 * parallel smcr_link_reg_rmb() 358 */ 359 mutex_lock(&lgr->llc_conf_mutex); 360 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 361 if (!smc_link_active(&lgr->lnk[i])) 362 continue; 363 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc); 364 if (rc) 365 goto out; 366 } 367 368 /* exchange confirm_rkey msg with peer */ 369 rc = smc_llc_do_confirm_rkey(link, rmb_desc); 370 if (rc) { 371 rc = -EFAULT; 372 goto out; 373 } 374 rmb_desc->is_conf_rkey = true; 375 out: 376 mutex_unlock(&lgr->llc_conf_mutex); 377 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 378 return rc; 379 } 380 381 static int smcr_clnt_conf_first_link(struct smc_sock *smc) 382 { 383 struct smc_link *link = smc->conn.lnk; 384 struct smc_llc_qentry *qentry; 385 int rc; 386 387 /* receive CONFIRM LINK request from server over RoCE fabric */ 388 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 389 SMC_LLC_CONFIRM_LINK); 390 if (!qentry) { 391 struct smc_clc_msg_decline dclc; 392 393 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 394 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 395 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 396 } 397 smc_llc_save_peer_uid(qentry); 398 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); 399 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 400 if (rc) 401 return SMC_CLC_DECL_RMBE_EC; 402 403 rc = smc_ib_modify_qp_rts(link); 404 if (rc) 405 return SMC_CLC_DECL_ERR_RDYLNK; 406 407 smc_wr_remember_qp_attr(link); 408 409 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 410 return SMC_CLC_DECL_ERR_REGRMB; 411 412 /* confirm_rkey is implicit on 1st contact */ 413 smc->conn.rmb_desc->is_conf_rkey = true; 414 415 /* send CONFIRM LINK response over RoCE fabric */ 416 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 417 if (rc < 0) 418 return SMC_CLC_DECL_TIMEOUT_CL; 419 420 smc_llc_link_active(link); 421 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 422 423 /* optional 2nd link, receive ADD LINK request from server */ 424 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 425 SMC_LLC_ADD_LINK); 426 if (!qentry) { 427 struct smc_clc_msg_decline dclc; 428 429 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 430 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 431 if (rc == -EAGAIN) 432 rc = 0; /* no DECLINE received, go with one link */ 433 return rc; 434 } 435 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); 436 smc_llc_cli_add_link(link, qentry); 437 return 0; 438 } 439 440 static void smcr_conn_save_peer_info(struct smc_sock *smc, 441 struct smc_clc_msg_accept_confirm *clc) 442 { 443 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); 444 445 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; 446 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); 447 smc->conn.peer_rmbe_size = bufsize; 448 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 449 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 450 } 451 452 static bool smc_isascii(char *hostname) 453 { 454 int i; 455 456 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) 457 if (!isascii(hostname[i])) 458 return false; 459 return true; 460 } 461 462 static void smcd_conn_save_peer_info(struct smc_sock *smc, 463 struct smc_clc_msg_accept_confirm *clc) 464 { 465 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); 466 467 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; 468 smc->conn.peer_token = clc->d0.token; 469 /* msg header takes up space in the buffer */ 470 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 471 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 472 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 473 if (clc->hdr.version > SMC_V1 && 474 (clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) { 475 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 476 (struct smc_clc_msg_accept_confirm_v2 *)clc; 477 struct smc_clc_first_contact_ext *fce = 478 (struct smc_clc_first_contact_ext *) 479 (((u8 *)clc_v2) + sizeof(*clc_v2)); 480 481 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid, 482 SMC_MAX_EID_LEN); 483 smc->conn.lgr->peer_os = fce->os_type; 484 smc->conn.lgr->peer_smc_release = fce->release; 485 if (smc_isascii(fce->hostname)) 486 memcpy(smc->conn.lgr->peer_hostname, fce->hostname, 487 SMC_MAX_HOSTNAME_LEN); 488 } 489 } 490 491 static void smc_conn_save_peer_info(struct smc_sock *smc, 492 struct smc_clc_msg_accept_confirm *clc) 493 { 494 if (smc->conn.lgr->is_smcd) 495 smcd_conn_save_peer_info(smc, clc); 496 else 497 smcr_conn_save_peer_info(smc, clc); 498 } 499 500 static void smc_link_save_peer_info(struct smc_link *link, 501 struct smc_clc_msg_accept_confirm *clc) 502 { 503 link->peer_qpn = ntoh24(clc->r0.qpn); 504 memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE); 505 memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac)); 506 link->peer_psn = ntoh24(clc->r0.psn); 507 link->peer_mtu = clc->r0.qp_mtu; 508 } 509 510 static void smc_switch_to_fallback(struct smc_sock *smc) 511 { 512 smc->use_fallback = true; 513 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 514 smc->clcsock->file = smc->sk.sk_socket->file; 515 smc->clcsock->file->private_data = smc->clcsock; 516 smc->clcsock->wq.fasync_list = 517 smc->sk.sk_socket->wq.fasync_list; 518 } 519 } 520 521 /* fall back during connect */ 522 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 523 { 524 smc_switch_to_fallback(smc); 525 smc->fallback_rsn = reason_code; 526 smc_copy_sock_settings_to_clc(smc); 527 smc->connect_nonblock = 0; 528 if (smc->sk.sk_state == SMC_INIT) 529 smc->sk.sk_state = SMC_ACTIVE; 530 return 0; 531 } 532 533 /* decline and fall back during connect */ 534 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 535 u8 version) 536 { 537 int rc; 538 539 if (reason_code < 0) { /* error, fallback is not possible */ 540 if (smc->sk.sk_state == SMC_INIT) 541 sock_put(&smc->sk); /* passive closing */ 542 return reason_code; 543 } 544 if (reason_code != SMC_CLC_DECL_PEERDECL) { 545 rc = smc_clc_send_decline(smc, reason_code, version); 546 if (rc < 0) { 547 if (smc->sk.sk_state == SMC_INIT) 548 sock_put(&smc->sk); /* passive closing */ 549 return rc; 550 } 551 } 552 return smc_connect_fallback(smc, reason_code); 553 } 554 555 /* abort connecting */ 556 static void smc_connect_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_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_connect_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_connect_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_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_v2_capable ? SMC_V2 : 0; 950 ini->smc_type_v1 = SMC_TYPE_B; 951 ini->smc_type_v2 = smc_ism_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 rc = 0; 1080 break; 1081 } 1082 1083 smc_copy_sock_settings_to_clc(smc); 1084 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1085 if (smc->connect_nonblock) { 1086 rc = -EALREADY; 1087 goto out; 1088 } 1089 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1090 if (rc && rc != -EINPROGRESS) 1091 goto out; 1092 1093 sock_hold(&smc->sk); /* sock put in passive closing */ 1094 if (smc->use_fallback) 1095 goto out; 1096 if (flags & O_NONBLOCK) { 1097 if (queue_work(smc_hs_wq, &smc->connect_work)) 1098 smc->connect_nonblock = 1; 1099 rc = -EINPROGRESS; 1100 } else { 1101 rc = __smc_connect(smc); 1102 if (rc < 0) 1103 goto out; 1104 else 1105 rc = 0; /* success cases including fallback */ 1106 } 1107 1108 out: 1109 release_sock(sk); 1110 out_err: 1111 return rc; 1112 } 1113 1114 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1115 { 1116 struct socket *new_clcsock = NULL; 1117 struct sock *lsk = &lsmc->sk; 1118 struct sock *new_sk; 1119 int rc = -EINVAL; 1120 1121 release_sock(lsk); 1122 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1123 if (!new_sk) { 1124 rc = -ENOMEM; 1125 lsk->sk_err = ENOMEM; 1126 *new_smc = NULL; 1127 lock_sock(lsk); 1128 goto out; 1129 } 1130 *new_smc = smc_sk(new_sk); 1131 1132 mutex_lock(&lsmc->clcsock_release_lock); 1133 if (lsmc->clcsock) 1134 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1135 mutex_unlock(&lsmc->clcsock_release_lock); 1136 lock_sock(lsk); 1137 if (rc < 0 && rc != -EAGAIN) 1138 lsk->sk_err = -rc; 1139 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1140 new_sk->sk_prot->unhash(new_sk); 1141 if (new_clcsock) 1142 sock_release(new_clcsock); 1143 new_sk->sk_state = SMC_CLOSED; 1144 sock_set_flag(new_sk, SOCK_DEAD); 1145 sock_put(new_sk); /* final */ 1146 *new_smc = NULL; 1147 goto out; 1148 } 1149 1150 /* new clcsock has inherited the smc listen-specific sk_data_ready 1151 * function; switch it back to the original sk_data_ready function 1152 */ 1153 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1154 (*new_smc)->clcsock = new_clcsock; 1155 out: 1156 return rc; 1157 } 1158 1159 /* add a just created sock to the accept queue of the listen sock as 1160 * candidate for a following socket accept call from user space 1161 */ 1162 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1163 { 1164 struct smc_sock *par = smc_sk(parent); 1165 1166 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1167 spin_lock(&par->accept_q_lock); 1168 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1169 spin_unlock(&par->accept_q_lock); 1170 sk_acceptq_added(parent); 1171 } 1172 1173 /* remove a socket from the accept queue of its parental listening socket */ 1174 static void smc_accept_unlink(struct sock *sk) 1175 { 1176 struct smc_sock *par = smc_sk(sk)->listen_smc; 1177 1178 spin_lock(&par->accept_q_lock); 1179 list_del_init(&smc_sk(sk)->accept_q); 1180 spin_unlock(&par->accept_q_lock); 1181 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1182 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1183 } 1184 1185 /* remove a sock from the accept queue to bind it to a new socket created 1186 * for a socket accept call from user space 1187 */ 1188 struct sock *smc_accept_dequeue(struct sock *parent, 1189 struct socket *new_sock) 1190 { 1191 struct smc_sock *isk, *n; 1192 struct sock *new_sk; 1193 1194 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1195 new_sk = (struct sock *)isk; 1196 1197 smc_accept_unlink(new_sk); 1198 if (new_sk->sk_state == SMC_CLOSED) { 1199 new_sk->sk_prot->unhash(new_sk); 1200 if (isk->clcsock) { 1201 sock_release(isk->clcsock); 1202 isk->clcsock = NULL; 1203 } 1204 sock_put(new_sk); /* final */ 1205 continue; 1206 } 1207 if (new_sock) { 1208 sock_graft(new_sk, new_sock); 1209 if (isk->use_fallback) { 1210 smc_sk(new_sk)->clcsock->file = new_sock->file; 1211 isk->clcsock->file->private_data = isk->clcsock; 1212 } 1213 } 1214 return new_sk; 1215 } 1216 return NULL; 1217 } 1218 1219 /* clean up for a created but never accepted sock */ 1220 void smc_close_non_accepted(struct sock *sk) 1221 { 1222 struct smc_sock *smc = smc_sk(sk); 1223 1224 sock_hold(sk); /* sock_put below */ 1225 lock_sock(sk); 1226 if (!sk->sk_lingertime) 1227 /* wait for peer closing */ 1228 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1229 __smc_release(smc); 1230 release_sock(sk); 1231 sock_put(sk); /* sock_hold above */ 1232 sock_put(sk); /* final sock_put */ 1233 } 1234 1235 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1236 { 1237 struct smc_link *link = smc->conn.lnk; 1238 struct smc_llc_qentry *qentry; 1239 int rc; 1240 1241 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1242 return SMC_CLC_DECL_ERR_REGRMB; 1243 1244 /* send CONFIRM LINK request to client over the RoCE fabric */ 1245 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1246 if (rc < 0) 1247 return SMC_CLC_DECL_TIMEOUT_CL; 1248 1249 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1250 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1251 SMC_LLC_CONFIRM_LINK); 1252 if (!qentry) { 1253 struct smc_clc_msg_decline dclc; 1254 1255 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1256 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1257 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1258 } 1259 smc_llc_save_peer_uid(qentry); 1260 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1261 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1262 if (rc) 1263 return SMC_CLC_DECL_RMBE_EC; 1264 1265 /* confirm_rkey is implicit on 1st contact */ 1266 smc->conn.rmb_desc->is_conf_rkey = true; 1267 1268 smc_llc_link_active(link); 1269 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1270 1271 /* initial contact - try to establish second link */ 1272 smc_llc_srv_add_link(link); 1273 return 0; 1274 } 1275 1276 /* listen worker: finish */ 1277 static void smc_listen_out(struct smc_sock *new_smc) 1278 { 1279 struct smc_sock *lsmc = new_smc->listen_smc; 1280 struct sock *newsmcsk = &new_smc->sk; 1281 1282 if (lsmc->sk.sk_state == SMC_LISTEN) { 1283 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1284 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1285 release_sock(&lsmc->sk); 1286 } else { /* no longer listening */ 1287 smc_close_non_accepted(newsmcsk); 1288 } 1289 1290 /* Wake up accept */ 1291 lsmc->sk.sk_data_ready(&lsmc->sk); 1292 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1293 } 1294 1295 /* listen worker: finish in state connected */ 1296 static void smc_listen_out_connected(struct smc_sock *new_smc) 1297 { 1298 struct sock *newsmcsk = &new_smc->sk; 1299 1300 sk_refcnt_debug_inc(newsmcsk); 1301 if (newsmcsk->sk_state == SMC_INIT) 1302 newsmcsk->sk_state = SMC_ACTIVE; 1303 1304 smc_listen_out(new_smc); 1305 } 1306 1307 /* listen worker: finish in error state */ 1308 static void smc_listen_out_err(struct smc_sock *new_smc) 1309 { 1310 struct sock *newsmcsk = &new_smc->sk; 1311 1312 if (newsmcsk->sk_state == SMC_INIT) 1313 sock_put(&new_smc->sk); /* passive closing */ 1314 newsmcsk->sk_state = SMC_CLOSED; 1315 1316 smc_listen_out(new_smc); 1317 } 1318 1319 /* listen worker: decline and fall back if possible */ 1320 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1321 int local_first, u8 version) 1322 { 1323 /* RDMA setup failed, switch back to TCP */ 1324 if (local_first) 1325 smc_lgr_cleanup_early(&new_smc->conn); 1326 else 1327 smc_conn_free(&new_smc->conn); 1328 if (reason_code < 0) { /* error, no fallback possible */ 1329 smc_listen_out_err(new_smc); 1330 return; 1331 } 1332 smc_switch_to_fallback(new_smc); 1333 new_smc->fallback_rsn = reason_code; 1334 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1335 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1336 smc_listen_out_err(new_smc); 1337 return; 1338 } 1339 } 1340 smc_listen_out_connected(new_smc); 1341 } 1342 1343 /* listen worker: version checking */ 1344 static int smc_listen_v2_check(struct smc_sock *new_smc, 1345 struct smc_clc_msg_proposal *pclc, 1346 struct smc_init_info *ini) 1347 { 1348 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1349 struct smc_clc_v2_extension *pclc_v2_ext; 1350 1351 ini->smc_type_v1 = pclc->hdr.typev1; 1352 ini->smc_type_v2 = pclc->hdr.typev2; 1353 ini->smcd_version = ini->smc_type_v1 != SMC_TYPE_N ? SMC_V1 : 0; 1354 if (pclc->hdr.version > SMC_V1) 1355 ini->smcd_version |= 1356 ini->smc_type_v2 != SMC_TYPE_N ? SMC_V2 : 0; 1357 if (!smc_ism_v2_capable) { 1358 ini->smcd_version &= ~SMC_V2; 1359 goto out; 1360 } 1361 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1362 if (!pclc_v2_ext) { 1363 ini->smcd_version &= ~SMC_V2; 1364 goto out; 1365 } 1366 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1367 if (!pclc_smcd_v2_ext) 1368 ini->smcd_version &= ~SMC_V2; 1369 1370 out: 1371 if (!ini->smcd_version) { 1372 if (pclc->hdr.typev1 == SMC_TYPE_B || 1373 pclc->hdr.typev2 == SMC_TYPE_B) 1374 return SMC_CLC_DECL_NOSMCDEV; 1375 if (pclc->hdr.typev1 == SMC_TYPE_D || 1376 pclc->hdr.typev2 == SMC_TYPE_D) 1377 return SMC_CLC_DECL_NOSMCDDEV; 1378 return SMC_CLC_DECL_NOSMCRDEV; 1379 } 1380 1381 return 0; 1382 } 1383 1384 /* listen worker: check prefixes */ 1385 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1386 struct smc_clc_msg_proposal *pclc) 1387 { 1388 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1389 struct socket *newclcsock = new_smc->clcsock; 1390 1391 if (pclc->hdr.typev1 == SMC_TYPE_N) 1392 return 0; 1393 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1394 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1395 return SMC_CLC_DECL_DIFFPREFIX; 1396 1397 return 0; 1398 } 1399 1400 /* listen worker: initialize connection and buffers */ 1401 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1402 struct smc_init_info *ini) 1403 { 1404 int rc; 1405 1406 /* allocate connection / link group */ 1407 rc = smc_conn_create(new_smc, ini); 1408 if (rc) 1409 return rc; 1410 1411 /* create send buffer and rmb */ 1412 if (smc_buf_create(new_smc, false)) 1413 return SMC_CLC_DECL_MEM; 1414 1415 return 0; 1416 } 1417 1418 /* listen worker: initialize connection and buffers for SMC-D */ 1419 static int smc_listen_ism_init(struct smc_sock *new_smc, 1420 struct smc_init_info *ini) 1421 { 1422 int rc; 1423 1424 rc = smc_conn_create(new_smc, ini); 1425 if (rc) 1426 return rc; 1427 1428 /* Create send and receive buffers */ 1429 rc = smc_buf_create(new_smc, true); 1430 if (rc) { 1431 if (ini->first_contact_local) 1432 smc_lgr_cleanup_early(&new_smc->conn); 1433 else 1434 smc_conn_free(&new_smc->conn); 1435 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1436 SMC_CLC_DECL_MEM; 1437 } 1438 1439 return 0; 1440 } 1441 1442 static bool smc_is_already_selected(struct smcd_dev *smcd, 1443 struct smc_init_info *ini, 1444 int matches) 1445 { 1446 int i; 1447 1448 for (i = 0; i < matches; i++) 1449 if (smcd == ini->ism_dev[i]) 1450 return true; 1451 1452 return false; 1453 } 1454 1455 /* check for ISM devices matching proposed ISM devices */ 1456 static void smc_check_ism_v2_match(struct smc_init_info *ini, 1457 u16 proposed_chid, u64 proposed_gid, 1458 unsigned int *matches) 1459 { 1460 struct smcd_dev *smcd; 1461 1462 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1463 if (smcd->going_away) 1464 continue; 1465 if (smc_is_already_selected(smcd, ini, *matches)) 1466 continue; 1467 if (smc_ism_get_chid(smcd) == proposed_chid && 1468 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1469 ini->ism_peer_gid[*matches] = proposed_gid; 1470 ini->ism_dev[*matches] = smcd; 1471 (*matches)++; 1472 break; 1473 } 1474 } 1475 } 1476 1477 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1478 struct smc_clc_msg_proposal *pclc, 1479 struct smc_init_info *ini) 1480 { 1481 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1482 struct smc_clc_v2_extension *smc_v2_ext; 1483 struct smc_clc_msg_smcd *pclc_smcd; 1484 unsigned int matches = 0; 1485 u8 smcd_version; 1486 u8 *eid = NULL; 1487 int i; 1488 1489 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1490 goto not_found; 1491 1492 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1493 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1494 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1495 if (!smcd_v2_ext || 1496 !smc_v2_ext->hdr.flag.seid) /* no system EID support for SMCD */ 1497 goto not_found; 1498 1499 mutex_lock(&smcd_dev_list.mutex); 1500 if (pclc_smcd->ism.chid) 1501 /* check for ISM device matching proposed native ISM device */ 1502 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1503 ntohll(pclc_smcd->ism.gid), &matches); 1504 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1505 /* check for ISM devices matching proposed non-native ISM 1506 * devices 1507 */ 1508 smc_check_ism_v2_match(ini, 1509 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1510 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1511 &matches); 1512 } 1513 mutex_unlock(&smcd_dev_list.mutex); 1514 1515 if (ini->ism_dev[0]) { 1516 smc_ism_get_system_eid(ini->ism_dev[0], &eid); 1517 if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN)) 1518 goto not_found; 1519 } else { 1520 goto not_found; 1521 } 1522 1523 /* separate - outside the smcd_dev_list.lock */ 1524 smcd_version = ini->smcd_version; 1525 for (i = 0; i < matches; i++) { 1526 ini->smcd_version = SMC_V2; 1527 ini->is_smcd = true; 1528 ini->ism_selected = i; 1529 if (smc_listen_ism_init(new_smc, ini)) 1530 /* try next active ISM device */ 1531 continue; 1532 return; /* matching and usable V2 ISM device found */ 1533 } 1534 /* no V2 ISM device could be initialized */ 1535 ini->smcd_version = smcd_version; /* restore original value */ 1536 1537 not_found: 1538 ini->smcd_version &= ~SMC_V2; 1539 ini->ism_dev[0] = NULL; 1540 ini->is_smcd = false; 1541 } 1542 1543 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1544 struct smc_clc_msg_proposal *pclc, 1545 struct smc_init_info *ini) 1546 { 1547 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1548 1549 /* check if ISM V1 is available */ 1550 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1551 goto not_found; 1552 ini->is_smcd = true; /* prepare ISM check */ 1553 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1554 if (smc_find_ism_device(new_smc, ini)) 1555 goto not_found; 1556 ini->ism_selected = 0; 1557 if (!smc_listen_ism_init(new_smc, ini)) 1558 return; /* V1 ISM device found */ 1559 1560 not_found: 1561 ini->ism_dev[0] = NULL; 1562 ini->is_smcd = false; 1563 } 1564 1565 /* listen worker: register buffers */ 1566 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1567 { 1568 struct smc_connection *conn = &new_smc->conn; 1569 1570 if (!local_first) { 1571 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1572 return SMC_CLC_DECL_ERR_REGRMB; 1573 } 1574 smc_rmb_sync_sg_for_device(&new_smc->conn); 1575 1576 return 0; 1577 } 1578 1579 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1580 struct smc_clc_msg_proposal *pclc, 1581 struct smc_init_info *ini) 1582 { 1583 int rc; 1584 1585 if (!smcr_indicated(ini->smc_type_v1)) 1586 return SMC_CLC_DECL_NOSMCDEV; 1587 1588 /* prepare RDMA check */ 1589 ini->ib_lcl = &pclc->lcl; 1590 rc = smc_find_rdma_device(new_smc, ini); 1591 if (rc) { 1592 /* no RDMA device found */ 1593 if (ini->smc_type_v1 == SMC_TYPE_B) 1594 /* neither ISM nor RDMA device found */ 1595 rc = SMC_CLC_DECL_NOSMCDEV; 1596 return rc; 1597 } 1598 rc = smc_listen_rdma_init(new_smc, ini); 1599 if (rc) 1600 return rc; 1601 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1602 } 1603 1604 /* determine the local device matching to proposal */ 1605 static int smc_listen_find_device(struct smc_sock *new_smc, 1606 struct smc_clc_msg_proposal *pclc, 1607 struct smc_init_info *ini) 1608 { 1609 int rc; 1610 1611 /* check for ISM device matching V2 proposed device */ 1612 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 1613 if (ini->ism_dev[0]) 1614 return 0; 1615 1616 if (!(ini->smcd_version & SMC_V1)) 1617 return SMC_CLC_DECL_NOSMCDEV; 1618 1619 /* check for matching IP prefix and subnet length */ 1620 rc = smc_listen_prfx_check(new_smc, pclc); 1621 if (rc) 1622 return rc; 1623 1624 /* get vlan id from IP device */ 1625 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 1626 return SMC_CLC_DECL_GETVLANERR; 1627 1628 /* check for ISM device matching V1 proposed device */ 1629 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 1630 if (ini->ism_dev[0]) 1631 return 0; 1632 1633 if (pclc->hdr.typev1 == SMC_TYPE_D) 1634 return SMC_CLC_DECL_NOSMCDDEV; /* skip RDMA and decline */ 1635 1636 /* check if RDMA is available */ 1637 return smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 1638 } 1639 1640 /* listen worker: finish RDMA setup */ 1641 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 1642 struct smc_clc_msg_accept_confirm *cclc, 1643 bool local_first) 1644 { 1645 struct smc_link *link = new_smc->conn.lnk; 1646 int reason_code = 0; 1647 1648 if (local_first) 1649 smc_link_save_peer_info(link, cclc); 1650 1651 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 1652 return SMC_CLC_DECL_ERR_RTOK; 1653 1654 if (local_first) { 1655 if (smc_ib_ready_link(link)) 1656 return SMC_CLC_DECL_ERR_RDYLNK; 1657 /* QP confirmation over RoCE fabric */ 1658 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1659 reason_code = smcr_serv_conf_first_link(new_smc); 1660 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1661 } 1662 return reason_code; 1663 } 1664 1665 /* setup for connection of server */ 1666 static void smc_listen_work(struct work_struct *work) 1667 { 1668 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1669 smc_listen_work); 1670 u8 version = smc_ism_v2_capable ? SMC_V2 : SMC_V1; 1671 struct socket *newclcsock = new_smc->clcsock; 1672 struct smc_clc_msg_accept_confirm *cclc; 1673 struct smc_clc_msg_proposal_area *buf; 1674 struct smc_clc_msg_proposal *pclc; 1675 struct smc_init_info *ini = NULL; 1676 int rc = 0; 1677 1678 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 1679 return smc_listen_out_err(new_smc); 1680 1681 if (new_smc->use_fallback) { 1682 smc_listen_out_connected(new_smc); 1683 return; 1684 } 1685 1686 /* check if peer is smc capable */ 1687 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1688 smc_switch_to_fallback(new_smc); 1689 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; 1690 smc_listen_out_connected(new_smc); 1691 return; 1692 } 1693 1694 /* do inband token exchange - 1695 * wait for and receive SMC Proposal CLC message 1696 */ 1697 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 1698 if (!buf) { 1699 rc = SMC_CLC_DECL_MEM; 1700 goto out_decl; 1701 } 1702 pclc = (struct smc_clc_msg_proposal *)buf; 1703 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 1704 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 1705 if (rc) 1706 goto out_decl; 1707 version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version; 1708 1709 /* IPSec connections opt out of SMC optimizations */ 1710 if (using_ipsec(new_smc)) { 1711 rc = SMC_CLC_DECL_IPSEC; 1712 goto out_decl; 1713 } 1714 1715 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1716 if (!ini) { 1717 rc = SMC_CLC_DECL_MEM; 1718 goto out_decl; 1719 } 1720 1721 /* initial version checking */ 1722 rc = smc_listen_v2_check(new_smc, pclc, ini); 1723 if (rc) 1724 goto out_decl; 1725 1726 mutex_lock(&smc_server_lgr_pending); 1727 smc_close_init(new_smc); 1728 smc_rx_init(new_smc); 1729 smc_tx_init(new_smc); 1730 1731 /* determine ISM or RoCE device used for connection */ 1732 rc = smc_listen_find_device(new_smc, pclc, ini); 1733 if (rc) 1734 goto out_unlock; 1735 1736 /* send SMC Accept CLC message */ 1737 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 1738 ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1); 1739 if (rc) 1740 goto out_unlock; 1741 1742 /* SMC-D does not need this lock any more */ 1743 if (ini->is_smcd) 1744 mutex_unlock(&smc_server_lgr_pending); 1745 1746 /* receive SMC Confirm CLC message */ 1747 memset(buf, 0, sizeof(*buf)); 1748 cclc = (struct smc_clc_msg_accept_confirm *)buf; 1749 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 1750 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 1751 if (rc) { 1752 if (!ini->is_smcd) 1753 goto out_unlock; 1754 goto out_decl; 1755 } 1756 1757 /* finish worker */ 1758 if (!ini->is_smcd) { 1759 rc = smc_listen_rdma_finish(new_smc, cclc, 1760 ini->first_contact_local); 1761 if (rc) 1762 goto out_unlock; 1763 mutex_unlock(&smc_server_lgr_pending); 1764 } 1765 smc_conn_save_peer_info(new_smc, cclc); 1766 smc_listen_out_connected(new_smc); 1767 goto out_free; 1768 1769 out_unlock: 1770 mutex_unlock(&smc_server_lgr_pending); 1771 out_decl: 1772 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 1773 version); 1774 out_free: 1775 kfree(ini); 1776 kfree(buf); 1777 } 1778 1779 static void smc_tcp_listen_work(struct work_struct *work) 1780 { 1781 struct smc_sock *lsmc = container_of(work, struct smc_sock, 1782 tcp_listen_work); 1783 struct sock *lsk = &lsmc->sk; 1784 struct smc_sock *new_smc; 1785 int rc = 0; 1786 1787 lock_sock(lsk); 1788 while (lsk->sk_state == SMC_LISTEN) { 1789 rc = smc_clcsock_accept(lsmc, &new_smc); 1790 if (rc) /* clcsock accept queue empty or error */ 1791 goto out; 1792 if (!new_smc) 1793 continue; 1794 1795 new_smc->listen_smc = lsmc; 1796 new_smc->use_fallback = lsmc->use_fallback; 1797 new_smc->fallback_rsn = lsmc->fallback_rsn; 1798 sock_hold(lsk); /* sock_put in smc_listen_work */ 1799 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 1800 smc_copy_sock_settings_to_smc(new_smc); 1801 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 1802 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 1803 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 1804 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 1805 sock_put(&new_smc->sk); 1806 } 1807 1808 out: 1809 release_sock(lsk); 1810 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 1811 } 1812 1813 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 1814 { 1815 struct smc_sock *lsmc; 1816 1817 lsmc = (struct smc_sock *) 1818 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY); 1819 if (!lsmc) 1820 return; 1821 lsmc->clcsk_data_ready(listen_clcsock); 1822 if (lsmc->sk.sk_state == SMC_LISTEN) { 1823 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 1824 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 1825 sock_put(&lsmc->sk); 1826 } 1827 } 1828 1829 static int smc_listen(struct socket *sock, int backlog) 1830 { 1831 struct sock *sk = sock->sk; 1832 struct smc_sock *smc; 1833 int rc; 1834 1835 smc = smc_sk(sk); 1836 lock_sock(sk); 1837 1838 rc = -EINVAL; 1839 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 1840 smc->connect_nonblock) 1841 goto out; 1842 1843 rc = 0; 1844 if (sk->sk_state == SMC_LISTEN) { 1845 sk->sk_max_ack_backlog = backlog; 1846 goto out; 1847 } 1848 /* some socket options are handled in core, so we could not apply 1849 * them to the clc socket -- copy smc socket options to clc socket 1850 */ 1851 smc_copy_sock_settings_to_clc(smc); 1852 if (!smc->use_fallback) 1853 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1854 1855 /* save original sk_data_ready function and establish 1856 * smc-specific sk_data_ready function 1857 */ 1858 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 1859 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 1860 smc->clcsock->sk->sk_user_data = 1861 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 1862 rc = kernel_listen(smc->clcsock, backlog); 1863 if (rc) 1864 goto out; 1865 sk->sk_max_ack_backlog = backlog; 1866 sk->sk_ack_backlog = 0; 1867 sk->sk_state = SMC_LISTEN; 1868 1869 out: 1870 release_sock(sk); 1871 return rc; 1872 } 1873 1874 static int smc_accept(struct socket *sock, struct socket *new_sock, 1875 int flags, bool kern) 1876 { 1877 struct sock *sk = sock->sk, *nsk; 1878 DECLARE_WAITQUEUE(wait, current); 1879 struct smc_sock *lsmc; 1880 long timeo; 1881 int rc = 0; 1882 1883 lsmc = smc_sk(sk); 1884 sock_hold(sk); /* sock_put below */ 1885 lock_sock(sk); 1886 1887 if (lsmc->sk.sk_state != SMC_LISTEN) { 1888 rc = -EINVAL; 1889 release_sock(sk); 1890 goto out; 1891 } 1892 1893 /* Wait for an incoming connection */ 1894 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1895 add_wait_queue_exclusive(sk_sleep(sk), &wait); 1896 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 1897 set_current_state(TASK_INTERRUPTIBLE); 1898 if (!timeo) { 1899 rc = -EAGAIN; 1900 break; 1901 } 1902 release_sock(sk); 1903 timeo = schedule_timeout(timeo); 1904 /* wakeup by sk_data_ready in smc_listen_work() */ 1905 sched_annotate_sleep(); 1906 lock_sock(sk); 1907 if (signal_pending(current)) { 1908 rc = sock_intr_errno(timeo); 1909 break; 1910 } 1911 } 1912 set_current_state(TASK_RUNNING); 1913 remove_wait_queue(sk_sleep(sk), &wait); 1914 1915 if (!rc) 1916 rc = sock_error(nsk); 1917 release_sock(sk); 1918 if (rc) 1919 goto out; 1920 1921 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 1922 /* wait till data arrives on the socket */ 1923 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 1924 MSEC_PER_SEC); 1925 if (smc_sk(nsk)->use_fallback) { 1926 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 1927 1928 lock_sock(clcsk); 1929 if (skb_queue_empty(&clcsk->sk_receive_queue)) 1930 sk_wait_data(clcsk, &timeo, NULL); 1931 release_sock(clcsk); 1932 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 1933 lock_sock(nsk); 1934 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 1935 release_sock(nsk); 1936 } 1937 } 1938 1939 out: 1940 sock_put(sk); /* sock_hold above */ 1941 return rc; 1942 } 1943 1944 static int smc_getname(struct socket *sock, struct sockaddr *addr, 1945 int peer) 1946 { 1947 struct smc_sock *smc; 1948 1949 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 1950 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 1951 return -ENOTCONN; 1952 1953 smc = smc_sk(sock->sk); 1954 1955 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 1956 } 1957 1958 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1959 { 1960 struct sock *sk = sock->sk; 1961 struct smc_sock *smc; 1962 int rc = -EPIPE; 1963 1964 smc = smc_sk(sk); 1965 lock_sock(sk); 1966 if ((sk->sk_state != SMC_ACTIVE) && 1967 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1968 (sk->sk_state != SMC_INIT)) 1969 goto out; 1970 1971 if (msg->msg_flags & MSG_FASTOPEN) { 1972 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 1973 smc_switch_to_fallback(smc); 1974 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 1975 } else { 1976 rc = -EINVAL; 1977 goto out; 1978 } 1979 } 1980 1981 if (smc->use_fallback) 1982 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 1983 else 1984 rc = smc_tx_sendmsg(smc, msg, len); 1985 out: 1986 release_sock(sk); 1987 return rc; 1988 } 1989 1990 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 1991 int flags) 1992 { 1993 struct sock *sk = sock->sk; 1994 struct smc_sock *smc; 1995 int rc = -ENOTCONN; 1996 1997 smc = smc_sk(sk); 1998 lock_sock(sk); 1999 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2000 /* socket was connected before, no more data to read */ 2001 rc = 0; 2002 goto out; 2003 } 2004 if ((sk->sk_state == SMC_INIT) || 2005 (sk->sk_state == SMC_LISTEN) || 2006 (sk->sk_state == SMC_CLOSED)) 2007 goto out; 2008 2009 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2010 rc = 0; 2011 goto out; 2012 } 2013 2014 if (smc->use_fallback) { 2015 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2016 } else { 2017 msg->msg_namelen = 0; 2018 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2019 } 2020 2021 out: 2022 release_sock(sk); 2023 return rc; 2024 } 2025 2026 static __poll_t smc_accept_poll(struct sock *parent) 2027 { 2028 struct smc_sock *isk = smc_sk(parent); 2029 __poll_t mask = 0; 2030 2031 spin_lock(&isk->accept_q_lock); 2032 if (!list_empty(&isk->accept_q)) 2033 mask = EPOLLIN | EPOLLRDNORM; 2034 spin_unlock(&isk->accept_q_lock); 2035 2036 return mask; 2037 } 2038 2039 static __poll_t smc_poll(struct file *file, struct socket *sock, 2040 poll_table *wait) 2041 { 2042 struct sock *sk = sock->sk; 2043 struct smc_sock *smc; 2044 __poll_t mask = 0; 2045 2046 if (!sk) 2047 return EPOLLNVAL; 2048 2049 smc = smc_sk(sock->sk); 2050 if (smc->use_fallback) { 2051 /* delegate to CLC child sock */ 2052 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2053 sk->sk_err = smc->clcsock->sk->sk_err; 2054 } else { 2055 if (sk->sk_state != SMC_CLOSED) 2056 sock_poll_wait(file, sock, wait); 2057 if (sk->sk_err) 2058 mask |= EPOLLERR; 2059 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2060 (sk->sk_state == SMC_CLOSED)) 2061 mask |= EPOLLHUP; 2062 if (sk->sk_state == SMC_LISTEN) { 2063 /* woken up by sk_data_ready in smc_listen_work() */ 2064 mask |= smc_accept_poll(sk); 2065 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2066 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2067 wait); 2068 sk->sk_err = smc->clcsock->sk->sk_err; 2069 } else { 2070 if ((sk->sk_state != SMC_INIT && 2071 atomic_read(&smc->conn.sndbuf_space)) || 2072 sk->sk_shutdown & SEND_SHUTDOWN) { 2073 mask |= EPOLLOUT | EPOLLWRNORM; 2074 } else { 2075 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2076 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2077 } 2078 if (atomic_read(&smc->conn.bytes_to_rcv)) 2079 mask |= EPOLLIN | EPOLLRDNORM; 2080 if (sk->sk_shutdown & RCV_SHUTDOWN) 2081 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2082 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2083 mask |= EPOLLIN; 2084 if (smc->conn.urg_state == SMC_URG_VALID) 2085 mask |= EPOLLPRI; 2086 } 2087 } 2088 2089 return mask; 2090 } 2091 2092 static int smc_shutdown(struct socket *sock, int how) 2093 { 2094 struct sock *sk = sock->sk; 2095 struct smc_sock *smc; 2096 int rc = -EINVAL; 2097 int rc1 = 0; 2098 2099 smc = smc_sk(sk); 2100 2101 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2102 return rc; 2103 2104 lock_sock(sk); 2105 2106 rc = -ENOTCONN; 2107 if ((sk->sk_state != SMC_ACTIVE) && 2108 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2109 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2110 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2111 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2112 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2113 goto out; 2114 if (smc->use_fallback) { 2115 rc = kernel_sock_shutdown(smc->clcsock, how); 2116 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2117 if (sk->sk_shutdown == SHUTDOWN_MASK) 2118 sk->sk_state = SMC_CLOSED; 2119 goto out; 2120 } 2121 switch (how) { 2122 case SHUT_RDWR: /* shutdown in both directions */ 2123 rc = smc_close_active(smc); 2124 break; 2125 case SHUT_WR: 2126 rc = smc_close_shutdown_write(smc); 2127 break; 2128 case SHUT_RD: 2129 rc = 0; 2130 /* nothing more to do because peer is not involved */ 2131 break; 2132 } 2133 if (smc->clcsock) 2134 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2135 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2136 sk->sk_shutdown |= how + 1; 2137 2138 out: 2139 release_sock(sk); 2140 return rc ? rc : rc1; 2141 } 2142 2143 static int smc_setsockopt(struct socket *sock, int level, int optname, 2144 sockptr_t optval, unsigned int optlen) 2145 { 2146 struct sock *sk = sock->sk; 2147 struct smc_sock *smc; 2148 int val, rc; 2149 2150 smc = smc_sk(sk); 2151 2152 /* generic setsockopts reaching us here always apply to the 2153 * CLC socket 2154 */ 2155 if (unlikely(!smc->clcsock->ops->setsockopt)) 2156 rc = -EOPNOTSUPP; 2157 else 2158 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2159 optval, optlen); 2160 if (smc->clcsock->sk->sk_err) { 2161 sk->sk_err = smc->clcsock->sk->sk_err; 2162 sk->sk_error_report(sk); 2163 } 2164 2165 if (optlen < sizeof(int)) 2166 return -EINVAL; 2167 if (copy_from_sockptr(&val, optval, sizeof(int))) 2168 return -EFAULT; 2169 2170 lock_sock(sk); 2171 if (rc || smc->use_fallback) 2172 goto out; 2173 switch (optname) { 2174 case TCP_ULP: 2175 case TCP_FASTOPEN: 2176 case TCP_FASTOPEN_CONNECT: 2177 case TCP_FASTOPEN_KEY: 2178 case TCP_FASTOPEN_NO_COOKIE: 2179 /* option not supported by SMC */ 2180 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2181 smc_switch_to_fallback(smc); 2182 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 2183 } else { 2184 rc = -EINVAL; 2185 } 2186 break; 2187 case TCP_NODELAY: 2188 if (sk->sk_state != SMC_INIT && 2189 sk->sk_state != SMC_LISTEN && 2190 sk->sk_state != SMC_CLOSED) { 2191 if (val) 2192 mod_delayed_work(smc->conn.lgr->tx_wq, 2193 &smc->conn.tx_work, 0); 2194 } 2195 break; 2196 case TCP_CORK: 2197 if (sk->sk_state != SMC_INIT && 2198 sk->sk_state != SMC_LISTEN && 2199 sk->sk_state != SMC_CLOSED) { 2200 if (!val) 2201 mod_delayed_work(smc->conn.lgr->tx_wq, 2202 &smc->conn.tx_work, 0); 2203 } 2204 break; 2205 case TCP_DEFER_ACCEPT: 2206 smc->sockopt_defer_accept = val; 2207 break; 2208 default: 2209 break; 2210 } 2211 out: 2212 release_sock(sk); 2213 2214 return rc; 2215 } 2216 2217 static int smc_getsockopt(struct socket *sock, int level, int optname, 2218 char __user *optval, int __user *optlen) 2219 { 2220 struct smc_sock *smc; 2221 2222 smc = smc_sk(sock->sk); 2223 /* socket options apply to the CLC socket */ 2224 if (unlikely(!smc->clcsock->ops->getsockopt)) 2225 return -EOPNOTSUPP; 2226 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2227 optval, optlen); 2228 } 2229 2230 static int smc_ioctl(struct socket *sock, unsigned int cmd, 2231 unsigned long arg) 2232 { 2233 union smc_host_cursor cons, urg; 2234 struct smc_connection *conn; 2235 struct smc_sock *smc; 2236 int answ; 2237 2238 smc = smc_sk(sock->sk); 2239 conn = &smc->conn; 2240 lock_sock(&smc->sk); 2241 if (smc->use_fallback) { 2242 if (!smc->clcsock) { 2243 release_sock(&smc->sk); 2244 return -EBADF; 2245 } 2246 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2247 release_sock(&smc->sk); 2248 return answ; 2249 } 2250 switch (cmd) { 2251 case SIOCINQ: /* same as FIONREAD */ 2252 if (smc->sk.sk_state == SMC_LISTEN) { 2253 release_sock(&smc->sk); 2254 return -EINVAL; 2255 } 2256 if (smc->sk.sk_state == SMC_INIT || 2257 smc->sk.sk_state == SMC_CLOSED) 2258 answ = 0; 2259 else 2260 answ = atomic_read(&smc->conn.bytes_to_rcv); 2261 break; 2262 case SIOCOUTQ: 2263 /* output queue size (not send + not acked) */ 2264 if (smc->sk.sk_state == SMC_LISTEN) { 2265 release_sock(&smc->sk); 2266 return -EINVAL; 2267 } 2268 if (smc->sk.sk_state == SMC_INIT || 2269 smc->sk.sk_state == SMC_CLOSED) 2270 answ = 0; 2271 else 2272 answ = smc->conn.sndbuf_desc->len - 2273 atomic_read(&smc->conn.sndbuf_space); 2274 break; 2275 case SIOCOUTQNSD: 2276 /* output queue size (not send only) */ 2277 if (smc->sk.sk_state == SMC_LISTEN) { 2278 release_sock(&smc->sk); 2279 return -EINVAL; 2280 } 2281 if (smc->sk.sk_state == SMC_INIT || 2282 smc->sk.sk_state == SMC_CLOSED) 2283 answ = 0; 2284 else 2285 answ = smc_tx_prepared_sends(&smc->conn); 2286 break; 2287 case SIOCATMARK: 2288 if (smc->sk.sk_state == SMC_LISTEN) { 2289 release_sock(&smc->sk); 2290 return -EINVAL; 2291 } 2292 if (smc->sk.sk_state == SMC_INIT || 2293 smc->sk.sk_state == SMC_CLOSED) { 2294 answ = 0; 2295 } else { 2296 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2297 smc_curs_copy(&urg, &conn->urg_curs, conn); 2298 answ = smc_curs_diff(conn->rmb_desc->len, 2299 &cons, &urg) == 1; 2300 } 2301 break; 2302 default: 2303 release_sock(&smc->sk); 2304 return -ENOIOCTLCMD; 2305 } 2306 release_sock(&smc->sk); 2307 2308 return put_user(answ, (int __user *)arg); 2309 } 2310 2311 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2312 int offset, size_t size, int flags) 2313 { 2314 struct sock *sk = sock->sk; 2315 struct smc_sock *smc; 2316 int rc = -EPIPE; 2317 2318 smc = smc_sk(sk); 2319 lock_sock(sk); 2320 if (sk->sk_state != SMC_ACTIVE) { 2321 release_sock(sk); 2322 goto out; 2323 } 2324 release_sock(sk); 2325 if (smc->use_fallback) 2326 rc = kernel_sendpage(smc->clcsock, page, offset, 2327 size, flags); 2328 else 2329 rc = sock_no_sendpage(sock, page, offset, size, flags); 2330 2331 out: 2332 return rc; 2333 } 2334 2335 /* Map the affected portions of the rmbe into an spd, note the number of bytes 2336 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2337 * updates till whenever a respective page has been fully processed. 2338 * Note that subsequent recv() calls have to wait till all splice() processing 2339 * completed. 2340 */ 2341 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2342 struct pipe_inode_info *pipe, size_t len, 2343 unsigned int flags) 2344 { 2345 struct sock *sk = sock->sk; 2346 struct smc_sock *smc; 2347 int rc = -ENOTCONN; 2348 2349 smc = smc_sk(sk); 2350 lock_sock(sk); 2351 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2352 /* socket was connected before, no more data to read */ 2353 rc = 0; 2354 goto out; 2355 } 2356 if (sk->sk_state == SMC_INIT || 2357 sk->sk_state == SMC_LISTEN || 2358 sk->sk_state == SMC_CLOSED) 2359 goto out; 2360 2361 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2362 rc = 0; 2363 goto out; 2364 } 2365 2366 if (smc->use_fallback) { 2367 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2368 pipe, len, flags); 2369 } else { 2370 if (*ppos) { 2371 rc = -ESPIPE; 2372 goto out; 2373 } 2374 if (flags & SPLICE_F_NONBLOCK) 2375 flags = MSG_DONTWAIT; 2376 else 2377 flags = 0; 2378 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2379 } 2380 out: 2381 release_sock(sk); 2382 2383 return rc; 2384 } 2385 2386 /* must look like tcp */ 2387 static const struct proto_ops smc_sock_ops = { 2388 .family = PF_SMC, 2389 .owner = THIS_MODULE, 2390 .release = smc_release, 2391 .bind = smc_bind, 2392 .connect = smc_connect, 2393 .socketpair = sock_no_socketpair, 2394 .accept = smc_accept, 2395 .getname = smc_getname, 2396 .poll = smc_poll, 2397 .ioctl = smc_ioctl, 2398 .listen = smc_listen, 2399 .shutdown = smc_shutdown, 2400 .setsockopt = smc_setsockopt, 2401 .getsockopt = smc_getsockopt, 2402 .sendmsg = smc_sendmsg, 2403 .recvmsg = smc_recvmsg, 2404 .mmap = sock_no_mmap, 2405 .sendpage = smc_sendpage, 2406 .splice_read = smc_splice_read, 2407 }; 2408 2409 static int smc_create(struct net *net, struct socket *sock, int protocol, 2410 int kern) 2411 { 2412 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2413 struct smc_sock *smc; 2414 struct sock *sk; 2415 int rc; 2416 2417 rc = -ESOCKTNOSUPPORT; 2418 if (sock->type != SOCK_STREAM) 2419 goto out; 2420 2421 rc = -EPROTONOSUPPORT; 2422 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2423 goto out; 2424 2425 rc = -ENOBUFS; 2426 sock->ops = &smc_sock_ops; 2427 sk = smc_sock_alloc(net, sock, protocol); 2428 if (!sk) 2429 goto out; 2430 2431 /* create internal TCP socket for CLC handshake and fallback */ 2432 smc = smc_sk(sk); 2433 smc->use_fallback = false; /* assume rdma capability first */ 2434 smc->fallback_rsn = 0; 2435 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2436 &smc->clcsock); 2437 if (rc) { 2438 sk_common_release(sk); 2439 goto out; 2440 } 2441 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2442 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2443 2444 out: 2445 return rc; 2446 } 2447 2448 static const struct net_proto_family smc_sock_family_ops = { 2449 .family = PF_SMC, 2450 .owner = THIS_MODULE, 2451 .create = smc_create, 2452 }; 2453 2454 unsigned int smc_net_id; 2455 2456 static __net_init int smc_net_init(struct net *net) 2457 { 2458 return smc_pnet_net_init(net); 2459 } 2460 2461 static void __net_exit smc_net_exit(struct net *net) 2462 { 2463 smc_pnet_net_exit(net); 2464 } 2465 2466 static struct pernet_operations smc_net_ops = { 2467 .init = smc_net_init, 2468 .exit = smc_net_exit, 2469 .id = &smc_net_id, 2470 .size = sizeof(struct smc_net), 2471 }; 2472 2473 static int __init smc_init(void) 2474 { 2475 int rc; 2476 2477 rc = register_pernet_subsys(&smc_net_ops); 2478 if (rc) 2479 return rc; 2480 2481 smc_ism_init(); 2482 smc_clc_init(); 2483 2484 rc = smc_pnet_init(); 2485 if (rc) 2486 goto out_pernet_subsys; 2487 2488 rc = -ENOMEM; 2489 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 2490 if (!smc_hs_wq) 2491 goto out_pnet; 2492 2493 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 2494 if (!smc_close_wq) 2495 goto out_alloc_hs_wq; 2496 2497 rc = smc_core_init(); 2498 if (rc) { 2499 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 2500 goto out_alloc_wqs; 2501 } 2502 2503 rc = smc_llc_init(); 2504 if (rc) { 2505 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 2506 goto out_core; 2507 } 2508 2509 rc = smc_cdc_init(); 2510 if (rc) { 2511 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 2512 goto out_core; 2513 } 2514 2515 rc = proto_register(&smc_proto, 1); 2516 if (rc) { 2517 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 2518 goto out_core; 2519 } 2520 2521 rc = proto_register(&smc_proto6, 1); 2522 if (rc) { 2523 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 2524 goto out_proto; 2525 } 2526 2527 rc = sock_register(&smc_sock_family_ops); 2528 if (rc) { 2529 pr_err("%s: sock_register fails with %d\n", __func__, rc); 2530 goto out_proto6; 2531 } 2532 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 2533 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 2534 2535 rc = smc_ib_register_client(); 2536 if (rc) { 2537 pr_err("%s: ib_register fails with %d\n", __func__, rc); 2538 goto out_sock; 2539 } 2540 2541 static_branch_enable(&tcp_have_smc); 2542 return 0; 2543 2544 out_sock: 2545 sock_unregister(PF_SMC); 2546 out_proto6: 2547 proto_unregister(&smc_proto6); 2548 out_proto: 2549 proto_unregister(&smc_proto); 2550 out_core: 2551 smc_core_exit(); 2552 out_alloc_wqs: 2553 destroy_workqueue(smc_close_wq); 2554 out_alloc_hs_wq: 2555 destroy_workqueue(smc_hs_wq); 2556 out_pnet: 2557 smc_pnet_exit(); 2558 out_pernet_subsys: 2559 unregister_pernet_subsys(&smc_net_ops); 2560 2561 return rc; 2562 } 2563 2564 static void __exit smc_exit(void) 2565 { 2566 static_branch_disable(&tcp_have_smc); 2567 sock_unregister(PF_SMC); 2568 smc_core_exit(); 2569 smc_ib_unregister_client(); 2570 destroy_workqueue(smc_close_wq); 2571 destroy_workqueue(smc_hs_wq); 2572 proto_unregister(&smc_proto6); 2573 proto_unregister(&smc_proto); 2574 smc_pnet_exit(); 2575 unregister_pernet_subsys(&smc_net_ops); 2576 rcu_barrier(); 2577 } 2578 2579 module_init(smc_init); 2580 module_exit(smc_exit); 2581 2582 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 2583 MODULE_DESCRIPTION("smc socket address family"); 2584 MODULE_LICENSE("GPL"); 2585 MODULE_ALIAS_NETPROTO(PF_SMC); 2586