1 /* 2 * Shared Memory Communications over RDMA (SMC-R) and RoCE 3 * 4 * AF_SMC protocol family socket handler keeping the AF_INET sock address type 5 * applies to SOCK_STREAM sockets only 6 * offers an alternative communication option for TCP-protocol sockets 7 * applicable with RoCE-cards only 8 * 9 * Initial restrictions: 10 * - support for alternate links postponed 11 * 12 * Copyright IBM Corp. 2016, 2018 13 * 14 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 15 * based on prototype from Frank Blaschka 16 */ 17 18 #define KMSG_COMPONENT "smc" 19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 20 21 #include <linux/module.h> 22 #include <linux/socket.h> 23 #include <linux/workqueue.h> 24 #include <linux/in.h> 25 #include <linux/sched/signal.h> 26 #include <linux/if_vlan.h> 27 28 #include <net/sock.h> 29 #include <net/tcp.h> 30 #include <net/smc.h> 31 #include <asm/ioctls.h> 32 33 #include "smc.h" 34 #include "smc_clc.h" 35 #include "smc_llc.h" 36 #include "smc_cdc.h" 37 #include "smc_core.h" 38 #include "smc_ib.h" 39 #include "smc_ism.h" 40 #include "smc_pnet.h" 41 #include "smc_tx.h" 42 #include "smc_rx.h" 43 #include "smc_close.h" 44 45 static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group 46 * creation 47 */ 48 49 static void smc_tcp_listen_work(struct work_struct *); 50 static void smc_connect_work(struct work_struct *); 51 52 static void smc_set_keepalive(struct sock *sk, int val) 53 { 54 struct smc_sock *smc = smc_sk(sk); 55 56 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 57 } 58 59 static struct smc_hashinfo smc_v4_hashinfo = { 60 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 61 }; 62 63 static struct smc_hashinfo smc_v6_hashinfo = { 64 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 65 }; 66 67 int smc_hash_sk(struct sock *sk) 68 { 69 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 70 struct hlist_head *head; 71 72 head = &h->ht; 73 74 write_lock_bh(&h->lock); 75 sk_add_node(sk, head); 76 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 77 write_unlock_bh(&h->lock); 78 79 return 0; 80 } 81 EXPORT_SYMBOL_GPL(smc_hash_sk); 82 83 void smc_unhash_sk(struct sock *sk) 84 { 85 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 86 87 write_lock_bh(&h->lock); 88 if (sk_del_node_init(sk)) 89 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 90 write_unlock_bh(&h->lock); 91 } 92 EXPORT_SYMBOL_GPL(smc_unhash_sk); 93 94 struct proto smc_proto = { 95 .name = "SMC", 96 .owner = THIS_MODULE, 97 .keepalive = smc_set_keepalive, 98 .hash = smc_hash_sk, 99 .unhash = smc_unhash_sk, 100 .obj_size = sizeof(struct smc_sock), 101 .h.smc_hash = &smc_v4_hashinfo, 102 .slab_flags = SLAB_TYPESAFE_BY_RCU, 103 }; 104 EXPORT_SYMBOL_GPL(smc_proto); 105 106 struct proto smc_proto6 = { 107 .name = "SMC6", 108 .owner = THIS_MODULE, 109 .keepalive = smc_set_keepalive, 110 .hash = smc_hash_sk, 111 .unhash = smc_unhash_sk, 112 .obj_size = sizeof(struct smc_sock), 113 .h.smc_hash = &smc_v6_hashinfo, 114 .slab_flags = SLAB_TYPESAFE_BY_RCU, 115 }; 116 EXPORT_SYMBOL_GPL(smc_proto6); 117 118 static int smc_release(struct socket *sock) 119 { 120 struct sock *sk = sock->sk; 121 struct smc_sock *smc; 122 int rc = 0; 123 124 if (!sk) 125 goto out; 126 127 smc = smc_sk(sk); 128 129 /* cleanup for a dangling non-blocking connect */ 130 flush_work(&smc->connect_work); 131 kfree(smc->connect_info); 132 smc->connect_info = NULL; 133 134 if (sk->sk_state == SMC_LISTEN) 135 /* smc_close_non_accepted() is called and acquires 136 * sock lock for child sockets again 137 */ 138 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 139 else 140 lock_sock(sk); 141 142 if (!smc->use_fallback) { 143 rc = smc_close_active(smc); 144 sock_set_flag(sk, SOCK_DEAD); 145 sk->sk_shutdown |= SHUTDOWN_MASK; 146 } 147 if (smc->clcsock) { 148 sock_release(smc->clcsock); 149 smc->clcsock = NULL; 150 } 151 if (smc->use_fallback) { 152 sock_put(sk); /* passive closing */ 153 sk->sk_state = SMC_CLOSED; 154 sk->sk_state_change(sk); 155 } 156 157 /* detach socket */ 158 sock_orphan(sk); 159 sock->sk = NULL; 160 if (!smc->use_fallback && sk->sk_state == SMC_CLOSED) 161 smc_conn_free(&smc->conn); 162 release_sock(sk); 163 164 sk->sk_prot->unhash(sk); 165 sock_put(sk); /* final sock_put */ 166 out: 167 return rc; 168 } 169 170 static void smc_destruct(struct sock *sk) 171 { 172 if (sk->sk_state != SMC_CLOSED) 173 return; 174 if (!sock_flag(sk, SOCK_DEAD)) 175 return; 176 177 sk_refcnt_debug_dec(sk); 178 } 179 180 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 181 int protocol) 182 { 183 struct smc_sock *smc; 184 struct proto *prot; 185 struct sock *sk; 186 187 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 188 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 189 if (!sk) 190 return NULL; 191 192 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 193 sk->sk_state = SMC_INIT; 194 sk->sk_destruct = smc_destruct; 195 sk->sk_protocol = protocol; 196 smc = smc_sk(sk); 197 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 198 INIT_WORK(&smc->connect_work, smc_connect_work); 199 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 200 INIT_LIST_HEAD(&smc->accept_q); 201 spin_lock_init(&smc->accept_q_lock); 202 spin_lock_init(&smc->conn.send_lock); 203 sk->sk_prot->hash(sk); 204 sk_refcnt_debug_inc(sk); 205 206 return sk; 207 } 208 209 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 210 int addr_len) 211 { 212 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 213 struct sock *sk = sock->sk; 214 struct smc_sock *smc; 215 int rc; 216 217 smc = smc_sk(sk); 218 219 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 220 rc = -EINVAL; 221 if (addr_len < sizeof(struct sockaddr_in)) 222 goto out; 223 224 rc = -EAFNOSUPPORT; 225 if (addr->sin_family != AF_INET && 226 addr->sin_family != AF_INET6 && 227 addr->sin_family != AF_UNSPEC) 228 goto out; 229 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 230 if (addr->sin_family == AF_UNSPEC && 231 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 232 goto out; 233 234 lock_sock(sk); 235 236 /* Check if socket is already active */ 237 rc = -EINVAL; 238 if (sk->sk_state != SMC_INIT) 239 goto out_rel; 240 241 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 242 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 243 244 out_rel: 245 release_sock(sk); 246 out: 247 return rc; 248 } 249 250 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 251 unsigned long mask) 252 { 253 /* options we don't get control via setsockopt for */ 254 nsk->sk_type = osk->sk_type; 255 nsk->sk_sndbuf = osk->sk_sndbuf; 256 nsk->sk_rcvbuf = osk->sk_rcvbuf; 257 nsk->sk_sndtimeo = osk->sk_sndtimeo; 258 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 259 nsk->sk_mark = osk->sk_mark; 260 nsk->sk_priority = osk->sk_priority; 261 nsk->sk_rcvlowat = osk->sk_rcvlowat; 262 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 263 nsk->sk_err = osk->sk_err; 264 265 nsk->sk_flags &= ~mask; 266 nsk->sk_flags |= osk->sk_flags & mask; 267 } 268 269 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 270 (1UL << SOCK_KEEPOPEN) | \ 271 (1UL << SOCK_LINGER) | \ 272 (1UL << SOCK_BROADCAST) | \ 273 (1UL << SOCK_TIMESTAMP) | \ 274 (1UL << SOCK_DBG) | \ 275 (1UL << SOCK_RCVTSTAMP) | \ 276 (1UL << SOCK_RCVTSTAMPNS) | \ 277 (1UL << SOCK_LOCALROUTE) | \ 278 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 279 (1UL << SOCK_RXQ_OVFL) | \ 280 (1UL << SOCK_WIFI_STATUS) | \ 281 (1UL << SOCK_NOFCS) | \ 282 (1UL << SOCK_FILTER_LOCKED)) 283 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 284 * clc socket (since smc is not called for these options from net/core) 285 */ 286 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 287 { 288 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 289 } 290 291 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 292 (1UL << SOCK_KEEPOPEN) | \ 293 (1UL << SOCK_LINGER) | \ 294 (1UL << SOCK_DBG)) 295 /* copy only settings and flags relevant for smc from clc to smc socket */ 296 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 297 { 298 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 299 } 300 301 /* register a new rmb, optionally send confirm_rkey msg to register with peer */ 302 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc, 303 bool conf_rkey) 304 { 305 /* register memory region for new rmb */ 306 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { 307 rmb_desc->regerr = 1; 308 return -EFAULT; 309 } 310 if (!conf_rkey) 311 return 0; 312 /* exchange confirm_rkey msg with peer */ 313 if (smc_llc_do_confirm_rkey(link, rmb_desc)) { 314 rmb_desc->regerr = 1; 315 return -EFAULT; 316 } 317 return 0; 318 } 319 320 static int smc_clnt_conf_first_link(struct smc_sock *smc) 321 { 322 struct net *net = sock_net(smc->clcsock->sk); 323 struct smc_link_group *lgr = smc->conn.lgr; 324 struct smc_link *link; 325 int rest; 326 int rc; 327 328 link = &lgr->lnk[SMC_SINGLE_LINK]; 329 /* receive CONFIRM LINK request from server over RoCE fabric */ 330 rest = wait_for_completion_interruptible_timeout( 331 &link->llc_confirm, 332 SMC_LLC_WAIT_FIRST_TIME); 333 if (rest <= 0) { 334 struct smc_clc_msg_decline dclc; 335 336 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 337 SMC_CLC_DECLINE); 338 return rc; 339 } 340 341 if (link->llc_confirm_rc) 342 return SMC_CLC_DECL_RMBE_EC; 343 344 rc = smc_ib_modify_qp_rts(link); 345 if (rc) 346 return SMC_CLC_DECL_INTERR; 347 348 smc_wr_remember_qp_attr(link); 349 350 if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) 351 return SMC_CLC_DECL_INTERR; 352 353 /* send CONFIRM LINK response over RoCE fabric */ 354 rc = smc_llc_send_confirm_link(link, 355 link->smcibdev->mac[link->ibport - 1], 356 &link->smcibdev->gid[link->ibport - 1], 357 SMC_LLC_RESP); 358 if (rc < 0) 359 return SMC_CLC_DECL_TCL; 360 361 /* receive ADD LINK request from server over RoCE fabric */ 362 rest = wait_for_completion_interruptible_timeout(&link->llc_add, 363 SMC_LLC_WAIT_TIME); 364 if (rest <= 0) { 365 struct smc_clc_msg_decline dclc; 366 367 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 368 SMC_CLC_DECLINE); 369 return rc; 370 } 371 372 /* send add link reject message, only one link supported for now */ 373 rc = smc_llc_send_add_link(link, 374 link->smcibdev->mac[link->ibport - 1], 375 &link->smcibdev->gid[link->ibport - 1], 376 SMC_LLC_RESP); 377 if (rc < 0) 378 return SMC_CLC_DECL_TCL; 379 380 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); 381 382 return 0; 383 } 384 385 static void smcr_conn_save_peer_info(struct smc_sock *smc, 386 struct smc_clc_msg_accept_confirm *clc) 387 { 388 int bufsize = smc_uncompress_bufsize(clc->rmbe_size); 389 390 smc->conn.peer_rmbe_idx = clc->rmbe_idx; 391 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token); 392 smc->conn.peer_rmbe_size = bufsize; 393 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 394 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 395 } 396 397 static void smcd_conn_save_peer_info(struct smc_sock *smc, 398 struct smc_clc_msg_accept_confirm *clc) 399 { 400 int bufsize = smc_uncompress_bufsize(clc->dmbe_size); 401 402 smc->conn.peer_rmbe_idx = clc->dmbe_idx; 403 smc->conn.peer_token = clc->token; 404 /* msg header takes up space in the buffer */ 405 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 406 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 407 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 408 } 409 410 static void smc_conn_save_peer_info(struct smc_sock *smc, 411 struct smc_clc_msg_accept_confirm *clc) 412 { 413 if (smc->conn.lgr->is_smcd) 414 smcd_conn_save_peer_info(smc, clc); 415 else 416 smcr_conn_save_peer_info(smc, clc); 417 } 418 419 static void smc_link_save_peer_info(struct smc_link *link, 420 struct smc_clc_msg_accept_confirm *clc) 421 { 422 link->peer_qpn = ntoh24(clc->qpn); 423 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); 424 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); 425 link->peer_psn = ntoh24(clc->psn); 426 link->peer_mtu = clc->qp_mtu; 427 } 428 429 /* fall back during connect */ 430 static int smc_connect_fallback(struct smc_sock *smc) 431 { 432 smc->use_fallback = true; 433 smc_copy_sock_settings_to_clc(smc); 434 if (smc->sk.sk_state == SMC_INIT) 435 smc->sk.sk_state = SMC_ACTIVE; 436 return 0; 437 } 438 439 /* decline and fall back during connect */ 440 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code) 441 { 442 int rc; 443 444 if (reason_code < 0) /* error, fallback is not possible */ 445 return reason_code; 446 if (reason_code != SMC_CLC_DECL_REPLY) { 447 rc = smc_clc_send_decline(smc, reason_code); 448 if (rc < 0) 449 return rc; 450 } 451 return smc_connect_fallback(smc); 452 } 453 454 /* abort connecting */ 455 static int smc_connect_abort(struct smc_sock *smc, int reason_code, 456 int local_contact) 457 { 458 if (local_contact == SMC_FIRST_CONTACT) 459 smc_lgr_forget(smc->conn.lgr); 460 mutex_unlock(&smc_create_lgr_pending); 461 smc_conn_free(&smc->conn); 462 if (reason_code < 0 && smc->sk.sk_state == SMC_INIT) 463 sock_put(&smc->sk); /* passive closing */ 464 return reason_code; 465 } 466 467 /* check if there is a rdma device available for this connection. */ 468 /* called for connect and listen */ 469 static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev, 470 u8 *ibport) 471 { 472 int reason_code = 0; 473 474 /* PNET table look up: search active ib_device and port 475 * within same PNETID that also contains the ethernet device 476 * used for the internal TCP socket 477 */ 478 smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport); 479 if (!(*ibdev)) 480 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ 481 482 return reason_code; 483 } 484 485 /* check if there is an ISM device available for this connection. */ 486 /* called for connect and listen */ 487 static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev) 488 { 489 /* Find ISM device with same PNETID as connecting interface */ 490 smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev); 491 if (!(*ismdev)) 492 return SMC_CLC_DECL_CNFERR; /* configuration error */ 493 return 0; 494 } 495 496 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 497 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 498 struct smcd_dev *ismdev, 499 unsigned short vlan_id) 500 { 501 if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id)) 502 return SMC_CLC_DECL_CNFERR; 503 return 0; 504 } 505 506 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 507 * used, the VLAN ID will be registered again during the connection setup. 508 */ 509 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd, 510 struct smcd_dev *ismdev, 511 unsigned short vlan_id) 512 { 513 if (!is_smcd) 514 return 0; 515 if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id)) 516 return SMC_CLC_DECL_CNFERR; 517 return 0; 518 } 519 520 /* CLC handshake during connect */ 521 static int smc_connect_clc(struct smc_sock *smc, int smc_type, 522 struct smc_clc_msg_accept_confirm *aclc, 523 struct smc_ib_device *ibdev, u8 ibport, 524 struct smcd_dev *ismdev) 525 { 526 int rc = 0; 527 528 /* do inband token exchange */ 529 rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, ismdev); 530 if (rc) 531 return rc; 532 /* receive SMC Accept CLC message */ 533 return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT); 534 } 535 536 /* setup for RDMA connection of client */ 537 static int smc_connect_rdma(struct smc_sock *smc, 538 struct smc_clc_msg_accept_confirm *aclc, 539 struct smc_ib_device *ibdev, u8 ibport) 540 { 541 int local_contact = SMC_FIRST_CONTACT; 542 struct smc_link *link; 543 int reason_code = 0; 544 545 mutex_lock(&smc_create_lgr_pending); 546 local_contact = smc_conn_create(smc, false, aclc->hdr.flag, ibdev, 547 ibport, &aclc->lcl, NULL, 0); 548 if (local_contact < 0) { 549 if (local_contact == -ENOMEM) 550 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ 551 else if (local_contact == -ENOLINK) 552 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ 553 else 554 reason_code = SMC_CLC_DECL_INTERR; /* other error */ 555 return smc_connect_abort(smc, reason_code, 0); 556 } 557 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 558 559 smc_conn_save_peer_info(smc, aclc); 560 561 /* create send buffer and rmb */ 562 if (smc_buf_create(smc, false)) 563 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); 564 565 if (local_contact == SMC_FIRST_CONTACT) 566 smc_link_save_peer_info(link, aclc); 567 568 if (smc_rmb_rtoken_handling(&smc->conn, aclc)) 569 return smc_connect_abort(smc, SMC_CLC_DECL_INTERR, 570 local_contact); 571 572 smc_close_init(smc); 573 smc_rx_init(smc); 574 575 if (local_contact == SMC_FIRST_CONTACT) { 576 if (smc_ib_ready_link(link)) 577 return smc_connect_abort(smc, SMC_CLC_DECL_INTERR, 578 local_contact); 579 } else { 580 if (!smc->conn.rmb_desc->reused && 581 smc_reg_rmb(link, smc->conn.rmb_desc, true)) 582 return smc_connect_abort(smc, SMC_CLC_DECL_INTERR, 583 local_contact); 584 } 585 smc_rmb_sync_sg_for_device(&smc->conn); 586 587 reason_code = smc_clc_send_confirm(smc); 588 if (reason_code) 589 return smc_connect_abort(smc, reason_code, local_contact); 590 591 smc_tx_init(smc); 592 593 if (local_contact == SMC_FIRST_CONTACT) { 594 /* QP confirmation over RoCE fabric */ 595 reason_code = smc_clnt_conf_first_link(smc); 596 if (reason_code) 597 return smc_connect_abort(smc, reason_code, 598 local_contact); 599 } 600 mutex_unlock(&smc_create_lgr_pending); 601 602 smc_copy_sock_settings_to_clc(smc); 603 if (smc->sk.sk_state == SMC_INIT) 604 smc->sk.sk_state = SMC_ACTIVE; 605 606 return 0; 607 } 608 609 /* setup for ISM connection of client */ 610 static int smc_connect_ism(struct smc_sock *smc, 611 struct smc_clc_msg_accept_confirm *aclc, 612 struct smcd_dev *ismdev) 613 { 614 int local_contact = SMC_FIRST_CONTACT; 615 int rc = 0; 616 617 mutex_lock(&smc_create_lgr_pending); 618 local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0, 619 NULL, ismdev, aclc->gid); 620 if (local_contact < 0) 621 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 0); 622 623 /* Create send and receive buffers */ 624 if (smc_buf_create(smc, true)) 625 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); 626 627 smc_conn_save_peer_info(smc, aclc); 628 smc_close_init(smc); 629 smc_rx_init(smc); 630 smc_tx_init(smc); 631 632 rc = smc_clc_send_confirm(smc); 633 if (rc) 634 return smc_connect_abort(smc, rc, local_contact); 635 mutex_unlock(&smc_create_lgr_pending); 636 637 smc_copy_sock_settings_to_clc(smc); 638 if (smc->sk.sk_state == SMC_INIT) 639 smc->sk.sk_state = SMC_ACTIVE; 640 641 return 0; 642 } 643 644 /* perform steps before actually connecting */ 645 static int __smc_connect(struct smc_sock *smc) 646 { 647 bool ism_supported = false, rdma_supported = false; 648 struct smc_clc_msg_accept_confirm aclc; 649 struct smc_ib_device *ibdev; 650 struct smcd_dev *ismdev; 651 unsigned short vlan; 652 int smc_type; 653 int rc = 0; 654 u8 ibport; 655 656 sock_hold(&smc->sk); /* sock put in passive closing */ 657 658 if (smc->use_fallback) 659 return smc_connect_fallback(smc); 660 661 /* if peer has not signalled SMC-capability, fall back */ 662 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 663 return smc_connect_fallback(smc); 664 665 /* IPSec connections opt out of SMC-R optimizations */ 666 if (using_ipsec(smc)) 667 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC); 668 669 /* check for VLAN ID */ 670 if (smc_vlan_by_tcpsk(smc->clcsock, &vlan)) 671 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR); 672 673 /* check if there is an ism device available */ 674 if (!smc_check_ism(smc, &ismdev) && 675 !smc_connect_ism_vlan_setup(smc, ismdev, vlan)) { 676 /* ISM is supported for this connection */ 677 ism_supported = true; 678 smc_type = SMC_TYPE_D; 679 } 680 681 /* check if there is a rdma device available */ 682 if (!smc_check_rdma(smc, &ibdev, &ibport)) { 683 /* RDMA is supported for this connection */ 684 rdma_supported = true; 685 if (ism_supported) 686 smc_type = SMC_TYPE_B; /* both */ 687 else 688 smc_type = SMC_TYPE_R; /* only RDMA */ 689 } 690 691 /* if neither ISM nor RDMA are supported, fallback */ 692 if (!rdma_supported && !ism_supported) 693 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR); 694 695 /* perform CLC handshake */ 696 rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, ismdev); 697 if (rc) { 698 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); 699 return smc_connect_decline_fallback(smc, rc); 700 } 701 702 /* depending on previous steps, connect using rdma or ism */ 703 if (rdma_supported && aclc.hdr.path == SMC_TYPE_R) 704 rc = smc_connect_rdma(smc, &aclc, ibdev, ibport); 705 else if (ism_supported && aclc.hdr.path == SMC_TYPE_D) 706 rc = smc_connect_ism(smc, &aclc, ismdev); 707 else 708 rc = SMC_CLC_DECL_CNFERR; 709 if (rc) { 710 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); 711 return smc_connect_decline_fallback(smc, rc); 712 } 713 714 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); 715 return 0; 716 } 717 718 static void smc_connect_work(struct work_struct *work) 719 { 720 struct smc_sock *smc = container_of(work, struct smc_sock, 721 connect_work); 722 int rc; 723 724 lock_sock(&smc->sk); 725 rc = kernel_connect(smc->clcsock, &smc->connect_info->addr, 726 smc->connect_info->alen, smc->connect_info->flags); 727 if (smc->clcsock->sk->sk_err) { 728 smc->sk.sk_err = smc->clcsock->sk->sk_err; 729 goto out; 730 } 731 if (rc < 0) { 732 smc->sk.sk_err = -rc; 733 goto out; 734 } 735 736 rc = __smc_connect(smc); 737 if (rc < 0) 738 smc->sk.sk_err = -rc; 739 740 out: 741 smc->sk.sk_state_change(&smc->sk); 742 kfree(smc->connect_info); 743 smc->connect_info = NULL; 744 release_sock(&smc->sk); 745 } 746 747 static int smc_connect(struct socket *sock, struct sockaddr *addr, 748 int alen, int flags) 749 { 750 struct sock *sk = sock->sk; 751 struct smc_sock *smc; 752 int rc = -EINVAL; 753 754 smc = smc_sk(sk); 755 756 /* separate smc parameter checking to be safe */ 757 if (alen < sizeof(addr->sa_family)) 758 goto out_err; 759 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 760 goto out_err; 761 762 lock_sock(sk); 763 switch (sk->sk_state) { 764 default: 765 goto out; 766 case SMC_ACTIVE: 767 rc = -EISCONN; 768 goto out; 769 case SMC_INIT: 770 rc = 0; 771 break; 772 } 773 774 smc_copy_sock_settings_to_clc(smc); 775 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 776 if (flags & O_NONBLOCK) { 777 if (smc->connect_info) { 778 rc = -EALREADY; 779 goto out; 780 } 781 smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL); 782 if (!smc->connect_info) { 783 rc = -ENOMEM; 784 goto out; 785 } 786 smc->connect_info->alen = alen; 787 smc->connect_info->flags = flags ^ O_NONBLOCK; 788 memcpy(&smc->connect_info->addr, addr, alen); 789 schedule_work(&smc->connect_work); 790 rc = -EINPROGRESS; 791 } else { 792 rc = kernel_connect(smc->clcsock, addr, alen, flags); 793 if (rc) 794 goto out; 795 796 rc = __smc_connect(smc); 797 if (rc < 0) 798 goto out; 799 else 800 rc = 0; /* success cases including fallback */ 801 } 802 803 out: 804 release_sock(sk); 805 out_err: 806 return rc; 807 } 808 809 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 810 { 811 struct socket *new_clcsock = NULL; 812 struct sock *lsk = &lsmc->sk; 813 struct sock *new_sk; 814 int rc; 815 816 release_sock(lsk); 817 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 818 if (!new_sk) { 819 rc = -ENOMEM; 820 lsk->sk_err = ENOMEM; 821 *new_smc = NULL; 822 lock_sock(lsk); 823 goto out; 824 } 825 *new_smc = smc_sk(new_sk); 826 827 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); 828 lock_sock(lsk); 829 if (rc < 0) 830 lsk->sk_err = -rc; 831 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 832 if (new_clcsock) 833 sock_release(new_clcsock); 834 new_sk->sk_state = SMC_CLOSED; 835 sock_set_flag(new_sk, SOCK_DEAD); 836 new_sk->sk_prot->unhash(new_sk); 837 sock_put(new_sk); /* final */ 838 *new_smc = NULL; 839 goto out; 840 } 841 842 (*new_smc)->clcsock = new_clcsock; 843 out: 844 return rc; 845 } 846 847 /* add a just created sock to the accept queue of the listen sock as 848 * candidate for a following socket accept call from user space 849 */ 850 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 851 { 852 struct smc_sock *par = smc_sk(parent); 853 854 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 855 spin_lock(&par->accept_q_lock); 856 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 857 spin_unlock(&par->accept_q_lock); 858 sk_acceptq_added(parent); 859 } 860 861 /* remove a socket from the accept queue of its parental listening socket */ 862 static void smc_accept_unlink(struct sock *sk) 863 { 864 struct smc_sock *par = smc_sk(sk)->listen_smc; 865 866 spin_lock(&par->accept_q_lock); 867 list_del_init(&smc_sk(sk)->accept_q); 868 spin_unlock(&par->accept_q_lock); 869 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 870 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 871 } 872 873 /* remove a sock from the accept queue to bind it to a new socket created 874 * for a socket accept call from user space 875 */ 876 struct sock *smc_accept_dequeue(struct sock *parent, 877 struct socket *new_sock) 878 { 879 struct smc_sock *isk, *n; 880 struct sock *new_sk; 881 882 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 883 new_sk = (struct sock *)isk; 884 885 smc_accept_unlink(new_sk); 886 if (new_sk->sk_state == SMC_CLOSED) { 887 if (isk->clcsock) { 888 sock_release(isk->clcsock); 889 isk->clcsock = NULL; 890 } 891 new_sk->sk_prot->unhash(new_sk); 892 sock_put(new_sk); /* final */ 893 continue; 894 } 895 if (new_sock) 896 sock_graft(new_sk, new_sock); 897 return new_sk; 898 } 899 return NULL; 900 } 901 902 /* clean up for a created but never accepted sock */ 903 void smc_close_non_accepted(struct sock *sk) 904 { 905 struct smc_sock *smc = smc_sk(sk); 906 907 lock_sock(sk); 908 if (!sk->sk_lingertime) 909 /* wait for peer closing */ 910 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 911 if (!smc->use_fallback) { 912 smc_close_active(smc); 913 sock_set_flag(sk, SOCK_DEAD); 914 sk->sk_shutdown |= SHUTDOWN_MASK; 915 } 916 if (smc->clcsock) { 917 struct socket *tcp; 918 919 tcp = smc->clcsock; 920 smc->clcsock = NULL; 921 sock_release(tcp); 922 } 923 if (smc->use_fallback) { 924 sock_put(sk); /* passive closing */ 925 sk->sk_state = SMC_CLOSED; 926 } else { 927 if (sk->sk_state == SMC_CLOSED) 928 smc_conn_free(&smc->conn); 929 } 930 release_sock(sk); 931 sk->sk_prot->unhash(sk); 932 sock_put(sk); /* final sock_put */ 933 } 934 935 static int smc_serv_conf_first_link(struct smc_sock *smc) 936 { 937 struct net *net = sock_net(smc->clcsock->sk); 938 struct smc_link_group *lgr = smc->conn.lgr; 939 struct smc_link *link; 940 int rest; 941 int rc; 942 943 link = &lgr->lnk[SMC_SINGLE_LINK]; 944 945 if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) 946 return SMC_CLC_DECL_INTERR; 947 948 /* send CONFIRM LINK request to client over the RoCE fabric */ 949 rc = smc_llc_send_confirm_link(link, 950 link->smcibdev->mac[link->ibport - 1], 951 &link->smcibdev->gid[link->ibport - 1], 952 SMC_LLC_REQ); 953 if (rc < 0) 954 return SMC_CLC_DECL_TCL; 955 956 /* receive CONFIRM LINK response from client over the RoCE fabric */ 957 rest = wait_for_completion_interruptible_timeout( 958 &link->llc_confirm_resp, 959 SMC_LLC_WAIT_FIRST_TIME); 960 if (rest <= 0) { 961 struct smc_clc_msg_decline dclc; 962 963 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 964 SMC_CLC_DECLINE); 965 return rc; 966 } 967 968 if (link->llc_confirm_resp_rc) 969 return SMC_CLC_DECL_RMBE_EC; 970 971 /* send ADD LINK request to client over the RoCE fabric */ 972 rc = smc_llc_send_add_link(link, 973 link->smcibdev->mac[link->ibport - 1], 974 &link->smcibdev->gid[link->ibport - 1], 975 SMC_LLC_REQ); 976 if (rc < 0) 977 return SMC_CLC_DECL_TCL; 978 979 /* receive ADD LINK response from client over the RoCE fabric */ 980 rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp, 981 SMC_LLC_WAIT_TIME); 982 if (rest <= 0) { 983 struct smc_clc_msg_decline dclc; 984 985 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 986 SMC_CLC_DECLINE); 987 return rc; 988 } 989 990 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); 991 992 return 0; 993 } 994 995 /* listen worker: finish */ 996 static void smc_listen_out(struct smc_sock *new_smc) 997 { 998 struct smc_sock *lsmc = new_smc->listen_smc; 999 struct sock *newsmcsk = &new_smc->sk; 1000 1001 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1002 if (lsmc->sk.sk_state == SMC_LISTEN) { 1003 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1004 } else { /* no longer listening */ 1005 smc_close_non_accepted(newsmcsk); 1006 } 1007 release_sock(&lsmc->sk); 1008 1009 /* Wake up accept */ 1010 lsmc->sk.sk_data_ready(&lsmc->sk); 1011 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1012 } 1013 1014 /* listen worker: finish in state connected */ 1015 static void smc_listen_out_connected(struct smc_sock *new_smc) 1016 { 1017 struct sock *newsmcsk = &new_smc->sk; 1018 1019 sk_refcnt_debug_inc(newsmcsk); 1020 if (newsmcsk->sk_state == SMC_INIT) 1021 newsmcsk->sk_state = SMC_ACTIVE; 1022 1023 smc_listen_out(new_smc); 1024 } 1025 1026 /* listen worker: finish in error state */ 1027 static void smc_listen_out_err(struct smc_sock *new_smc) 1028 { 1029 struct sock *newsmcsk = &new_smc->sk; 1030 1031 if (newsmcsk->sk_state == SMC_INIT) 1032 sock_put(&new_smc->sk); /* passive closing */ 1033 newsmcsk->sk_state = SMC_CLOSED; 1034 smc_conn_free(&new_smc->conn); 1035 1036 smc_listen_out(new_smc); 1037 } 1038 1039 /* listen worker: decline and fall back if possible */ 1040 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1041 int local_contact) 1042 { 1043 /* RDMA setup failed, switch back to TCP */ 1044 if (local_contact == SMC_FIRST_CONTACT) 1045 smc_lgr_forget(new_smc->conn.lgr); 1046 if (reason_code < 0) { /* error, no fallback possible */ 1047 smc_listen_out_err(new_smc); 1048 return; 1049 } 1050 smc_conn_free(&new_smc->conn); 1051 new_smc->use_fallback = true; 1052 if (reason_code && reason_code != SMC_CLC_DECL_REPLY) { 1053 if (smc_clc_send_decline(new_smc, reason_code) < 0) { 1054 smc_listen_out_err(new_smc); 1055 return; 1056 } 1057 } 1058 smc_listen_out_connected(new_smc); 1059 } 1060 1061 /* listen worker: check prefixes */ 1062 static int smc_listen_rdma_check(struct smc_sock *new_smc, 1063 struct smc_clc_msg_proposal *pclc) 1064 { 1065 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1066 struct socket *newclcsock = new_smc->clcsock; 1067 1068 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1069 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1070 return SMC_CLC_DECL_CNFERR; 1071 1072 return 0; 1073 } 1074 1075 /* listen worker: initialize connection and buffers */ 1076 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1077 struct smc_clc_msg_proposal *pclc, 1078 struct smc_ib_device *ibdev, u8 ibport, 1079 int *local_contact) 1080 { 1081 /* allocate connection / link group */ 1082 *local_contact = smc_conn_create(new_smc, false, 0, ibdev, ibport, 1083 &pclc->lcl, NULL, 0); 1084 if (*local_contact < 0) { 1085 if (*local_contact == -ENOMEM) 1086 return SMC_CLC_DECL_MEM;/* insufficient memory*/ 1087 return SMC_CLC_DECL_INTERR; /* other error */ 1088 } 1089 1090 /* create send buffer and rmb */ 1091 if (smc_buf_create(new_smc, false)) 1092 return SMC_CLC_DECL_MEM; 1093 1094 return 0; 1095 } 1096 1097 /* listen worker: initialize connection and buffers for SMC-D */ 1098 static int smc_listen_ism_init(struct smc_sock *new_smc, 1099 struct smc_clc_msg_proposal *pclc, 1100 struct smcd_dev *ismdev, 1101 int *local_contact) 1102 { 1103 struct smc_clc_msg_smcd *pclc_smcd; 1104 1105 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1106 *local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, NULL, 1107 ismdev, pclc_smcd->gid); 1108 if (*local_contact < 0) { 1109 if (*local_contact == -ENOMEM) 1110 return SMC_CLC_DECL_MEM;/* insufficient memory*/ 1111 return SMC_CLC_DECL_INTERR; /* other error */ 1112 } 1113 1114 /* Check if peer can be reached via ISM device */ 1115 if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid, 1116 new_smc->conn.lgr->vlan_id, 1117 new_smc->conn.lgr->smcd)) { 1118 if (*local_contact == SMC_FIRST_CONTACT) 1119 smc_lgr_forget(new_smc->conn.lgr); 1120 smc_conn_free(&new_smc->conn); 1121 return SMC_CLC_DECL_CNFERR; 1122 } 1123 1124 /* Create send and receive buffers */ 1125 if (smc_buf_create(new_smc, true)) { 1126 if (*local_contact == SMC_FIRST_CONTACT) 1127 smc_lgr_forget(new_smc->conn.lgr); 1128 smc_conn_free(&new_smc->conn); 1129 return SMC_CLC_DECL_MEM; 1130 } 1131 1132 return 0; 1133 } 1134 1135 /* listen worker: register buffers */ 1136 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact) 1137 { 1138 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 1139 1140 if (local_contact != SMC_FIRST_CONTACT) { 1141 if (!new_smc->conn.rmb_desc->reused) { 1142 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) 1143 return SMC_CLC_DECL_INTERR; 1144 } 1145 } 1146 smc_rmb_sync_sg_for_device(&new_smc->conn); 1147 1148 return 0; 1149 } 1150 1151 /* listen worker: finish RDMA setup */ 1152 static void smc_listen_rdma_finish(struct smc_sock *new_smc, 1153 struct smc_clc_msg_accept_confirm *cclc, 1154 int local_contact) 1155 { 1156 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 1157 int reason_code = 0; 1158 1159 if (local_contact == SMC_FIRST_CONTACT) 1160 smc_link_save_peer_info(link, cclc); 1161 1162 if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) { 1163 reason_code = SMC_CLC_DECL_INTERR; 1164 goto decline; 1165 } 1166 1167 if (local_contact == SMC_FIRST_CONTACT) { 1168 if (smc_ib_ready_link(link)) { 1169 reason_code = SMC_CLC_DECL_INTERR; 1170 goto decline; 1171 } 1172 /* QP confirmation over RoCE fabric */ 1173 reason_code = smc_serv_conf_first_link(new_smc); 1174 if (reason_code) 1175 goto decline; 1176 } 1177 return; 1178 1179 decline: 1180 mutex_unlock(&smc_create_lgr_pending); 1181 smc_listen_decline(new_smc, reason_code, local_contact); 1182 } 1183 1184 /* setup for RDMA connection of server */ 1185 static void smc_listen_work(struct work_struct *work) 1186 { 1187 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1188 smc_listen_work); 1189 struct socket *newclcsock = new_smc->clcsock; 1190 struct smc_clc_msg_accept_confirm cclc; 1191 struct smc_clc_msg_proposal *pclc; 1192 struct smc_ib_device *ibdev; 1193 bool ism_supported = false; 1194 struct smcd_dev *ismdev; 1195 u8 buf[SMC_CLC_MAX_LEN]; 1196 int local_contact = 0; 1197 int reason_code = 0; 1198 int rc = 0; 1199 u8 ibport; 1200 1201 if (new_smc->use_fallback) { 1202 smc_listen_out_connected(new_smc); 1203 return; 1204 } 1205 1206 /* check if peer is smc capable */ 1207 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1208 new_smc->use_fallback = true; 1209 smc_listen_out_connected(new_smc); 1210 return; 1211 } 1212 1213 /* do inband token exchange - 1214 * wait for and receive SMC Proposal CLC message 1215 */ 1216 pclc = (struct smc_clc_msg_proposal *)&buf; 1217 reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN, 1218 SMC_CLC_PROPOSAL); 1219 if (reason_code) { 1220 smc_listen_decline(new_smc, reason_code, 0); 1221 return; 1222 } 1223 1224 /* IPSec connections opt out of SMC-R optimizations */ 1225 if (using_ipsec(new_smc)) { 1226 smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0); 1227 return; 1228 } 1229 1230 mutex_lock(&smc_create_lgr_pending); 1231 smc_close_init(new_smc); 1232 smc_rx_init(new_smc); 1233 smc_tx_init(new_smc); 1234 1235 /* check if ISM is available */ 1236 if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) && 1237 !smc_check_ism(new_smc, &ismdev) && 1238 !smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) { 1239 ism_supported = true; 1240 } 1241 1242 /* check if RDMA is available */ 1243 if (!ism_supported && 1244 ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) || 1245 smc_check_rdma(new_smc, &ibdev, &ibport) || 1246 smc_listen_rdma_check(new_smc, pclc) || 1247 smc_listen_rdma_init(new_smc, pclc, ibdev, ibport, 1248 &local_contact) || 1249 smc_listen_rdma_reg(new_smc, local_contact))) { 1250 /* SMC not supported, decline */ 1251 mutex_unlock(&smc_create_lgr_pending); 1252 smc_listen_decline(new_smc, SMC_CLC_DECL_CNFERR, local_contact); 1253 return; 1254 } 1255 1256 /* send SMC Accept CLC message */ 1257 rc = smc_clc_send_accept(new_smc, local_contact); 1258 if (rc) { 1259 mutex_unlock(&smc_create_lgr_pending); 1260 smc_listen_decline(new_smc, rc, local_contact); 1261 return; 1262 } 1263 1264 /* receive SMC Confirm CLC message */ 1265 reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), 1266 SMC_CLC_CONFIRM); 1267 if (reason_code) { 1268 mutex_unlock(&smc_create_lgr_pending); 1269 smc_listen_decline(new_smc, reason_code, local_contact); 1270 return; 1271 } 1272 1273 /* finish worker */ 1274 if (!ism_supported) 1275 smc_listen_rdma_finish(new_smc, &cclc, local_contact); 1276 smc_conn_save_peer_info(new_smc, &cclc); 1277 mutex_unlock(&smc_create_lgr_pending); 1278 smc_listen_out_connected(new_smc); 1279 } 1280 1281 static void smc_tcp_listen_work(struct work_struct *work) 1282 { 1283 struct smc_sock *lsmc = container_of(work, struct smc_sock, 1284 tcp_listen_work); 1285 struct sock *lsk = &lsmc->sk; 1286 struct smc_sock *new_smc; 1287 int rc = 0; 1288 1289 lock_sock(lsk); 1290 while (lsk->sk_state == SMC_LISTEN) { 1291 rc = smc_clcsock_accept(lsmc, &new_smc); 1292 if (rc) 1293 goto out; 1294 if (!new_smc) 1295 continue; 1296 1297 new_smc->listen_smc = lsmc; 1298 new_smc->use_fallback = lsmc->use_fallback; 1299 sock_hold(lsk); /* sock_put in smc_listen_work */ 1300 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 1301 smc_copy_sock_settings_to_smc(new_smc); 1302 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 1303 if (!schedule_work(&new_smc->smc_listen_work)) 1304 sock_put(&new_smc->sk); 1305 } 1306 1307 out: 1308 release_sock(lsk); 1309 sock_put(&lsmc->sk); /* sock_hold in smc_listen */ 1310 } 1311 1312 static int smc_listen(struct socket *sock, int backlog) 1313 { 1314 struct sock *sk = sock->sk; 1315 struct smc_sock *smc; 1316 int rc; 1317 1318 smc = smc_sk(sk); 1319 lock_sock(sk); 1320 1321 rc = -EINVAL; 1322 if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) 1323 goto out; 1324 1325 rc = 0; 1326 if (sk->sk_state == SMC_LISTEN) { 1327 sk->sk_max_ack_backlog = backlog; 1328 goto out; 1329 } 1330 /* some socket options are handled in core, so we could not apply 1331 * them to the clc socket -- copy smc socket options to clc socket 1332 */ 1333 smc_copy_sock_settings_to_clc(smc); 1334 if (!smc->use_fallback) 1335 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1336 1337 rc = kernel_listen(smc->clcsock, backlog); 1338 if (rc) 1339 goto out; 1340 sk->sk_max_ack_backlog = backlog; 1341 sk->sk_ack_backlog = 0; 1342 sk->sk_state = SMC_LISTEN; 1343 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 1344 sock_hold(sk); /* sock_hold in tcp_listen_worker */ 1345 if (!schedule_work(&smc->tcp_listen_work)) 1346 sock_put(sk); 1347 1348 out: 1349 release_sock(sk); 1350 return rc; 1351 } 1352 1353 static int smc_accept(struct socket *sock, struct socket *new_sock, 1354 int flags, bool kern) 1355 { 1356 struct sock *sk = sock->sk, *nsk; 1357 DECLARE_WAITQUEUE(wait, current); 1358 struct smc_sock *lsmc; 1359 long timeo; 1360 int rc = 0; 1361 1362 lsmc = smc_sk(sk); 1363 sock_hold(sk); /* sock_put below */ 1364 lock_sock(sk); 1365 1366 if (lsmc->sk.sk_state != SMC_LISTEN) { 1367 rc = -EINVAL; 1368 release_sock(sk); 1369 goto out; 1370 } 1371 1372 /* Wait for an incoming connection */ 1373 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1374 add_wait_queue_exclusive(sk_sleep(sk), &wait); 1375 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 1376 set_current_state(TASK_INTERRUPTIBLE); 1377 if (!timeo) { 1378 rc = -EAGAIN; 1379 break; 1380 } 1381 release_sock(sk); 1382 timeo = schedule_timeout(timeo); 1383 /* wakeup by sk_data_ready in smc_listen_work() */ 1384 sched_annotate_sleep(); 1385 lock_sock(sk); 1386 if (signal_pending(current)) { 1387 rc = sock_intr_errno(timeo); 1388 break; 1389 } 1390 } 1391 set_current_state(TASK_RUNNING); 1392 remove_wait_queue(sk_sleep(sk), &wait); 1393 1394 if (!rc) 1395 rc = sock_error(nsk); 1396 release_sock(sk); 1397 if (rc) 1398 goto out; 1399 1400 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 1401 /* wait till data arrives on the socket */ 1402 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 1403 MSEC_PER_SEC); 1404 if (smc_sk(nsk)->use_fallback) { 1405 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 1406 1407 lock_sock(clcsk); 1408 if (skb_queue_empty(&clcsk->sk_receive_queue)) 1409 sk_wait_data(clcsk, &timeo, NULL); 1410 release_sock(clcsk); 1411 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 1412 lock_sock(nsk); 1413 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 1414 release_sock(nsk); 1415 } 1416 } 1417 1418 out: 1419 sock_put(sk); /* sock_hold above */ 1420 return rc; 1421 } 1422 1423 static int smc_getname(struct socket *sock, struct sockaddr *addr, 1424 int peer) 1425 { 1426 struct smc_sock *smc; 1427 1428 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 1429 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 1430 return -ENOTCONN; 1431 1432 smc = smc_sk(sock->sk); 1433 1434 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 1435 } 1436 1437 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1438 { 1439 struct sock *sk = sock->sk; 1440 struct smc_sock *smc; 1441 int rc = -EPIPE; 1442 1443 smc = smc_sk(sk); 1444 lock_sock(sk); 1445 if ((sk->sk_state != SMC_ACTIVE) && 1446 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1447 (sk->sk_state != SMC_INIT)) 1448 goto out; 1449 1450 if (msg->msg_flags & MSG_FASTOPEN) { 1451 if (sk->sk_state == SMC_INIT) { 1452 smc->use_fallback = true; 1453 } else { 1454 rc = -EINVAL; 1455 goto out; 1456 } 1457 } 1458 1459 if (smc->use_fallback) 1460 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 1461 else 1462 rc = smc_tx_sendmsg(smc, msg, len); 1463 out: 1464 release_sock(sk); 1465 return rc; 1466 } 1467 1468 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 1469 int flags) 1470 { 1471 struct sock *sk = sock->sk; 1472 struct smc_sock *smc; 1473 int rc = -ENOTCONN; 1474 1475 smc = smc_sk(sk); 1476 lock_sock(sk); 1477 if ((sk->sk_state == SMC_INIT) || 1478 (sk->sk_state == SMC_LISTEN) || 1479 (sk->sk_state == SMC_CLOSED)) 1480 goto out; 1481 1482 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 1483 rc = 0; 1484 goto out; 1485 } 1486 1487 if (smc->use_fallback) { 1488 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 1489 } else { 1490 msg->msg_namelen = 0; 1491 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 1492 } 1493 1494 out: 1495 release_sock(sk); 1496 return rc; 1497 } 1498 1499 static __poll_t smc_accept_poll(struct sock *parent) 1500 { 1501 struct smc_sock *isk = smc_sk(parent); 1502 __poll_t mask = 0; 1503 1504 spin_lock(&isk->accept_q_lock); 1505 if (!list_empty(&isk->accept_q)) 1506 mask = EPOLLIN | EPOLLRDNORM; 1507 spin_unlock(&isk->accept_q_lock); 1508 1509 return mask; 1510 } 1511 1512 static __poll_t smc_poll(struct file *file, struct socket *sock, 1513 poll_table *wait) 1514 { 1515 struct sock *sk = sock->sk; 1516 __poll_t mask = 0; 1517 struct smc_sock *smc; 1518 1519 if (!sk) 1520 return EPOLLNVAL; 1521 1522 smc = smc_sk(sock->sk); 1523 if ((sk->sk_state == SMC_INIT) || smc->use_fallback) { 1524 /* delegate to CLC child sock */ 1525 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 1526 sk->sk_err = smc->clcsock->sk->sk_err; 1527 if (sk->sk_err) 1528 mask |= EPOLLERR; 1529 } else { 1530 if (sk->sk_err) 1531 mask |= EPOLLERR; 1532 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 1533 (sk->sk_state == SMC_CLOSED)) 1534 mask |= EPOLLHUP; 1535 if (sk->sk_state == SMC_LISTEN) { 1536 /* woken up by sk_data_ready in smc_listen_work() */ 1537 mask = smc_accept_poll(sk); 1538 } else { 1539 if (atomic_read(&smc->conn.sndbuf_space) || 1540 sk->sk_shutdown & SEND_SHUTDOWN) { 1541 mask |= EPOLLOUT | EPOLLWRNORM; 1542 } else { 1543 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1544 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1545 } 1546 if (atomic_read(&smc->conn.bytes_to_rcv)) 1547 mask |= EPOLLIN | EPOLLRDNORM; 1548 if (sk->sk_shutdown & RCV_SHUTDOWN) 1549 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 1550 if (sk->sk_state == SMC_APPCLOSEWAIT1) 1551 mask |= EPOLLIN; 1552 } 1553 if (smc->conn.urg_state == SMC_URG_VALID) 1554 mask |= EPOLLPRI; 1555 1556 } 1557 1558 return mask; 1559 } 1560 1561 static int smc_shutdown(struct socket *sock, int how) 1562 { 1563 struct sock *sk = sock->sk; 1564 struct smc_sock *smc; 1565 int rc = -EINVAL; 1566 int rc1 = 0; 1567 1568 smc = smc_sk(sk); 1569 1570 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 1571 return rc; 1572 1573 lock_sock(sk); 1574 1575 rc = -ENOTCONN; 1576 if ((sk->sk_state != SMC_LISTEN) && 1577 (sk->sk_state != SMC_ACTIVE) && 1578 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 1579 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 1580 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1581 (sk->sk_state != SMC_APPCLOSEWAIT2) && 1582 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 1583 goto out; 1584 if (smc->use_fallback) { 1585 rc = kernel_sock_shutdown(smc->clcsock, how); 1586 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 1587 if (sk->sk_shutdown == SHUTDOWN_MASK) 1588 sk->sk_state = SMC_CLOSED; 1589 goto out; 1590 } 1591 switch (how) { 1592 case SHUT_RDWR: /* shutdown in both directions */ 1593 rc = smc_close_active(smc); 1594 break; 1595 case SHUT_WR: 1596 rc = smc_close_shutdown_write(smc); 1597 break; 1598 case SHUT_RD: 1599 rc = 0; 1600 /* nothing more to do because peer is not involved */ 1601 break; 1602 } 1603 if (smc->clcsock) 1604 rc1 = kernel_sock_shutdown(smc->clcsock, how); 1605 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 1606 sk->sk_shutdown |= how + 1; 1607 1608 out: 1609 release_sock(sk); 1610 return rc ? rc : rc1; 1611 } 1612 1613 static int smc_setsockopt(struct socket *sock, int level, int optname, 1614 char __user *optval, unsigned int optlen) 1615 { 1616 struct sock *sk = sock->sk; 1617 struct smc_sock *smc; 1618 int val, rc; 1619 1620 smc = smc_sk(sk); 1621 1622 /* generic setsockopts reaching us here always apply to the 1623 * CLC socket 1624 */ 1625 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 1626 optval, optlen); 1627 if (smc->clcsock->sk->sk_err) { 1628 sk->sk_err = smc->clcsock->sk->sk_err; 1629 sk->sk_error_report(sk); 1630 } 1631 if (rc) 1632 return rc; 1633 1634 if (optlen < sizeof(int)) 1635 return -EINVAL; 1636 get_user(val, (int __user *)optval); 1637 1638 lock_sock(sk); 1639 switch (optname) { 1640 case TCP_ULP: 1641 case TCP_FASTOPEN: 1642 case TCP_FASTOPEN_CONNECT: 1643 case TCP_FASTOPEN_KEY: 1644 case TCP_FASTOPEN_NO_COOKIE: 1645 /* option not supported by SMC */ 1646 if (sk->sk_state == SMC_INIT) { 1647 smc->use_fallback = true; 1648 } else { 1649 if (!smc->use_fallback) 1650 rc = -EINVAL; 1651 } 1652 break; 1653 case TCP_NODELAY: 1654 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { 1655 if (val && !smc->use_fallback) 1656 mod_delayed_work(system_wq, &smc->conn.tx_work, 1657 0); 1658 } 1659 break; 1660 case TCP_CORK: 1661 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { 1662 if (!val && !smc->use_fallback) 1663 mod_delayed_work(system_wq, &smc->conn.tx_work, 1664 0); 1665 } 1666 break; 1667 case TCP_DEFER_ACCEPT: 1668 smc->sockopt_defer_accept = val; 1669 break; 1670 default: 1671 break; 1672 } 1673 release_sock(sk); 1674 1675 return rc; 1676 } 1677 1678 static int smc_getsockopt(struct socket *sock, int level, int optname, 1679 char __user *optval, int __user *optlen) 1680 { 1681 struct smc_sock *smc; 1682 1683 smc = smc_sk(sock->sk); 1684 /* socket options apply to the CLC socket */ 1685 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 1686 optval, optlen); 1687 } 1688 1689 static int smc_ioctl(struct socket *sock, unsigned int cmd, 1690 unsigned long arg) 1691 { 1692 union smc_host_cursor cons, urg; 1693 struct smc_connection *conn; 1694 struct smc_sock *smc; 1695 int answ; 1696 1697 smc = smc_sk(sock->sk); 1698 conn = &smc->conn; 1699 if (smc->use_fallback) { 1700 if (!smc->clcsock) 1701 return -EBADF; 1702 return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 1703 } 1704 switch (cmd) { 1705 case SIOCINQ: /* same as FIONREAD */ 1706 if (smc->sk.sk_state == SMC_LISTEN) 1707 return -EINVAL; 1708 if (smc->sk.sk_state == SMC_INIT || 1709 smc->sk.sk_state == SMC_CLOSED) 1710 answ = 0; 1711 else 1712 answ = atomic_read(&smc->conn.bytes_to_rcv); 1713 break; 1714 case SIOCOUTQ: 1715 /* output queue size (not send + not acked) */ 1716 if (smc->sk.sk_state == SMC_LISTEN) 1717 return -EINVAL; 1718 if (smc->sk.sk_state == SMC_INIT || 1719 smc->sk.sk_state == SMC_CLOSED) 1720 answ = 0; 1721 else 1722 answ = smc->conn.sndbuf_desc->len - 1723 atomic_read(&smc->conn.sndbuf_space); 1724 break; 1725 case SIOCOUTQNSD: 1726 /* output queue size (not send only) */ 1727 if (smc->sk.sk_state == SMC_LISTEN) 1728 return -EINVAL; 1729 if (smc->sk.sk_state == SMC_INIT || 1730 smc->sk.sk_state == SMC_CLOSED) 1731 answ = 0; 1732 else 1733 answ = smc_tx_prepared_sends(&smc->conn); 1734 break; 1735 case SIOCATMARK: 1736 if (smc->sk.sk_state == SMC_LISTEN) 1737 return -EINVAL; 1738 if (smc->sk.sk_state == SMC_INIT || 1739 smc->sk.sk_state == SMC_CLOSED) { 1740 answ = 0; 1741 } else { 1742 smc_curs_write(&cons, 1743 smc_curs_read(&conn->local_tx_ctrl.cons, conn), 1744 conn); 1745 smc_curs_write(&urg, 1746 smc_curs_read(&conn->urg_curs, conn), 1747 conn); 1748 answ = smc_curs_diff(conn->rmb_desc->len, 1749 &cons, &urg) == 1; 1750 } 1751 break; 1752 default: 1753 return -ENOIOCTLCMD; 1754 } 1755 1756 return put_user(answ, (int __user *)arg); 1757 } 1758 1759 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 1760 int offset, size_t size, int flags) 1761 { 1762 struct sock *sk = sock->sk; 1763 struct smc_sock *smc; 1764 int rc = -EPIPE; 1765 1766 smc = smc_sk(sk); 1767 lock_sock(sk); 1768 if (sk->sk_state != SMC_ACTIVE) { 1769 release_sock(sk); 1770 goto out; 1771 } 1772 release_sock(sk); 1773 if (smc->use_fallback) 1774 rc = kernel_sendpage(smc->clcsock, page, offset, 1775 size, flags); 1776 else 1777 rc = sock_no_sendpage(sock, page, offset, size, flags); 1778 1779 out: 1780 return rc; 1781 } 1782 1783 /* Map the affected portions of the rmbe into an spd, note the number of bytes 1784 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 1785 * updates till whenever a respective page has been fully processed. 1786 * Note that subsequent recv() calls have to wait till all splice() processing 1787 * completed. 1788 */ 1789 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 1790 struct pipe_inode_info *pipe, size_t len, 1791 unsigned int flags) 1792 { 1793 struct sock *sk = sock->sk; 1794 struct smc_sock *smc; 1795 int rc = -ENOTCONN; 1796 1797 smc = smc_sk(sk); 1798 lock_sock(sk); 1799 1800 if (sk->sk_state == SMC_INIT || 1801 sk->sk_state == SMC_LISTEN || 1802 sk->sk_state == SMC_CLOSED) 1803 goto out; 1804 1805 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 1806 rc = 0; 1807 goto out; 1808 } 1809 1810 if (smc->use_fallback) { 1811 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 1812 pipe, len, flags); 1813 } else { 1814 if (*ppos) { 1815 rc = -ESPIPE; 1816 goto out; 1817 } 1818 if (flags & SPLICE_F_NONBLOCK) 1819 flags = MSG_DONTWAIT; 1820 else 1821 flags = 0; 1822 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 1823 } 1824 out: 1825 release_sock(sk); 1826 1827 return rc; 1828 } 1829 1830 /* must look like tcp */ 1831 static const struct proto_ops smc_sock_ops = { 1832 .family = PF_SMC, 1833 .owner = THIS_MODULE, 1834 .release = smc_release, 1835 .bind = smc_bind, 1836 .connect = smc_connect, 1837 .socketpair = sock_no_socketpair, 1838 .accept = smc_accept, 1839 .getname = smc_getname, 1840 .poll = smc_poll, 1841 .ioctl = smc_ioctl, 1842 .listen = smc_listen, 1843 .shutdown = smc_shutdown, 1844 .setsockopt = smc_setsockopt, 1845 .getsockopt = smc_getsockopt, 1846 .sendmsg = smc_sendmsg, 1847 .recvmsg = smc_recvmsg, 1848 .mmap = sock_no_mmap, 1849 .sendpage = smc_sendpage, 1850 .splice_read = smc_splice_read, 1851 }; 1852 1853 static int smc_create(struct net *net, struct socket *sock, int protocol, 1854 int kern) 1855 { 1856 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 1857 struct smc_sock *smc; 1858 struct sock *sk; 1859 int rc; 1860 1861 rc = -ESOCKTNOSUPPORT; 1862 if (sock->type != SOCK_STREAM) 1863 goto out; 1864 1865 rc = -EPROTONOSUPPORT; 1866 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 1867 goto out; 1868 1869 rc = -ENOBUFS; 1870 sock->ops = &smc_sock_ops; 1871 sk = smc_sock_alloc(net, sock, protocol); 1872 if (!sk) 1873 goto out; 1874 1875 /* create internal TCP socket for CLC handshake and fallback */ 1876 smc = smc_sk(sk); 1877 smc->use_fallback = false; /* assume rdma capability first */ 1878 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 1879 &smc->clcsock); 1880 if (rc) { 1881 sk_common_release(sk); 1882 goto out; 1883 } 1884 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 1885 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 1886 1887 out: 1888 return rc; 1889 } 1890 1891 static const struct net_proto_family smc_sock_family_ops = { 1892 .family = PF_SMC, 1893 .owner = THIS_MODULE, 1894 .create = smc_create, 1895 }; 1896 1897 static int __init smc_init(void) 1898 { 1899 int rc; 1900 1901 rc = smc_pnet_init(); 1902 if (rc) 1903 return rc; 1904 1905 rc = smc_llc_init(); 1906 if (rc) { 1907 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 1908 goto out_pnet; 1909 } 1910 1911 rc = smc_cdc_init(); 1912 if (rc) { 1913 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 1914 goto out_pnet; 1915 } 1916 1917 rc = proto_register(&smc_proto, 1); 1918 if (rc) { 1919 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 1920 goto out_pnet; 1921 } 1922 1923 rc = proto_register(&smc_proto6, 1); 1924 if (rc) { 1925 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 1926 goto out_proto; 1927 } 1928 1929 rc = sock_register(&smc_sock_family_ops); 1930 if (rc) { 1931 pr_err("%s: sock_register fails with %d\n", __func__, rc); 1932 goto out_proto6; 1933 } 1934 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 1935 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 1936 1937 rc = smc_ib_register_client(); 1938 if (rc) { 1939 pr_err("%s: ib_register fails with %d\n", __func__, rc); 1940 goto out_sock; 1941 } 1942 1943 static_branch_enable(&tcp_have_smc); 1944 return 0; 1945 1946 out_sock: 1947 sock_unregister(PF_SMC); 1948 out_proto6: 1949 proto_unregister(&smc_proto6); 1950 out_proto: 1951 proto_unregister(&smc_proto); 1952 out_pnet: 1953 smc_pnet_exit(); 1954 return rc; 1955 } 1956 1957 static void __exit smc_exit(void) 1958 { 1959 smc_core_exit(); 1960 static_branch_disable(&tcp_have_smc); 1961 smc_ib_unregister_client(); 1962 sock_unregister(PF_SMC); 1963 proto_unregister(&smc_proto6); 1964 proto_unregister(&smc_proto); 1965 smc_pnet_exit(); 1966 } 1967 1968 module_init(smc_init); 1969 module_exit(smc_exit); 1970 1971 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 1972 MODULE_DESCRIPTION("smc socket address family"); 1973 MODULE_LICENSE("GPL"); 1974 MODULE_ALIAS_NETPROTO(PF_SMC); 1975