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 : version; 983 if (rc) 984 goto vlan_cleanup; 985 986 /* depending on previous steps, connect using rdma or ism */ 987 if (aclc->hdr.typev1 == SMC_TYPE_R) 988 rc = smc_connect_rdma(smc, aclc, ini); 989 else if (aclc->hdr.typev1 == SMC_TYPE_D) 990 rc = smc_connect_ism(smc, aclc, ini); 991 if (rc) 992 goto vlan_cleanup; 993 994 smc_connect_ism_vlan_cleanup(smc, ini); 995 kfree(buf); 996 kfree(ini); 997 return 0; 998 999 vlan_cleanup: 1000 smc_connect_ism_vlan_cleanup(smc, ini); 1001 kfree(buf); 1002 fallback: 1003 kfree(ini); 1004 return smc_connect_decline_fallback(smc, rc, version); 1005 } 1006 1007 static void smc_connect_work(struct work_struct *work) 1008 { 1009 struct smc_sock *smc = container_of(work, struct smc_sock, 1010 connect_work); 1011 long timeo = smc->sk.sk_sndtimeo; 1012 int rc = 0; 1013 1014 if (!timeo) 1015 timeo = MAX_SCHEDULE_TIMEOUT; 1016 lock_sock(smc->clcsock->sk); 1017 if (smc->clcsock->sk->sk_err) { 1018 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1019 } else if ((1 << smc->clcsock->sk->sk_state) & 1020 (TCPF_SYN_SENT | TCP_SYN_RECV)) { 1021 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1022 if ((rc == -EPIPE) && 1023 ((1 << smc->clcsock->sk->sk_state) & 1024 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1025 rc = 0; 1026 } 1027 release_sock(smc->clcsock->sk); 1028 lock_sock(&smc->sk); 1029 if (rc != 0 || smc->sk.sk_err) { 1030 smc->sk.sk_state = SMC_CLOSED; 1031 if (rc == -EPIPE || rc == -EAGAIN) 1032 smc->sk.sk_err = EPIPE; 1033 else if (signal_pending(current)) 1034 smc->sk.sk_err = -sock_intr_errno(timeo); 1035 sock_put(&smc->sk); /* passive closing */ 1036 goto out; 1037 } 1038 1039 rc = __smc_connect(smc); 1040 if (rc < 0) 1041 smc->sk.sk_err = -rc; 1042 1043 out: 1044 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1045 if (smc->sk.sk_err) { 1046 smc->sk.sk_state_change(&smc->sk); 1047 } else { /* allow polling before and after fallback decision */ 1048 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1049 smc->sk.sk_write_space(&smc->sk); 1050 } 1051 } 1052 release_sock(&smc->sk); 1053 } 1054 1055 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1056 int alen, int flags) 1057 { 1058 struct sock *sk = sock->sk; 1059 struct smc_sock *smc; 1060 int rc = -EINVAL; 1061 1062 smc = smc_sk(sk); 1063 1064 /* separate smc parameter checking to be safe */ 1065 if (alen < sizeof(addr->sa_family)) 1066 goto out_err; 1067 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1068 goto out_err; 1069 1070 lock_sock(sk); 1071 switch (sk->sk_state) { 1072 default: 1073 goto out; 1074 case SMC_ACTIVE: 1075 rc = -EISCONN; 1076 goto out; 1077 case SMC_INIT: 1078 rc = 0; 1079 break; 1080 } 1081 1082 smc_copy_sock_settings_to_clc(smc); 1083 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1084 if (smc->connect_nonblock) { 1085 rc = -EALREADY; 1086 goto out; 1087 } 1088 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1089 if (rc && rc != -EINPROGRESS) 1090 goto out; 1091 1092 sock_hold(&smc->sk); /* sock put in passive closing */ 1093 if (smc->use_fallback) 1094 goto out; 1095 if (flags & O_NONBLOCK) { 1096 if (queue_work(smc_hs_wq, &smc->connect_work)) 1097 smc->connect_nonblock = 1; 1098 rc = -EINPROGRESS; 1099 } else { 1100 rc = __smc_connect(smc); 1101 if (rc < 0) 1102 goto out; 1103 else 1104 rc = 0; /* success cases including fallback */ 1105 } 1106 1107 out: 1108 release_sock(sk); 1109 out_err: 1110 return rc; 1111 } 1112 1113 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1114 { 1115 struct socket *new_clcsock = NULL; 1116 struct sock *lsk = &lsmc->sk; 1117 struct sock *new_sk; 1118 int rc = -EINVAL; 1119 1120 release_sock(lsk); 1121 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1122 if (!new_sk) { 1123 rc = -ENOMEM; 1124 lsk->sk_err = ENOMEM; 1125 *new_smc = NULL; 1126 lock_sock(lsk); 1127 goto out; 1128 } 1129 *new_smc = smc_sk(new_sk); 1130 1131 mutex_lock(&lsmc->clcsock_release_lock); 1132 if (lsmc->clcsock) 1133 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1134 mutex_unlock(&lsmc->clcsock_release_lock); 1135 lock_sock(lsk); 1136 if (rc < 0 && rc != -EAGAIN) 1137 lsk->sk_err = -rc; 1138 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1139 new_sk->sk_prot->unhash(new_sk); 1140 if (new_clcsock) 1141 sock_release(new_clcsock); 1142 new_sk->sk_state = SMC_CLOSED; 1143 sock_set_flag(new_sk, SOCK_DEAD); 1144 sock_put(new_sk); /* final */ 1145 *new_smc = NULL; 1146 goto out; 1147 } 1148 1149 /* new clcsock has inherited the smc listen-specific sk_data_ready 1150 * function; switch it back to the original sk_data_ready function 1151 */ 1152 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1153 (*new_smc)->clcsock = new_clcsock; 1154 out: 1155 return rc; 1156 } 1157 1158 /* add a just created sock to the accept queue of the listen sock as 1159 * candidate for a following socket accept call from user space 1160 */ 1161 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1162 { 1163 struct smc_sock *par = smc_sk(parent); 1164 1165 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1166 spin_lock(&par->accept_q_lock); 1167 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1168 spin_unlock(&par->accept_q_lock); 1169 sk_acceptq_added(parent); 1170 } 1171 1172 /* remove a socket from the accept queue of its parental listening socket */ 1173 static void smc_accept_unlink(struct sock *sk) 1174 { 1175 struct smc_sock *par = smc_sk(sk)->listen_smc; 1176 1177 spin_lock(&par->accept_q_lock); 1178 list_del_init(&smc_sk(sk)->accept_q); 1179 spin_unlock(&par->accept_q_lock); 1180 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1181 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1182 } 1183 1184 /* remove a sock from the accept queue to bind it to a new socket created 1185 * for a socket accept call from user space 1186 */ 1187 struct sock *smc_accept_dequeue(struct sock *parent, 1188 struct socket *new_sock) 1189 { 1190 struct smc_sock *isk, *n; 1191 struct sock *new_sk; 1192 1193 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1194 new_sk = (struct sock *)isk; 1195 1196 smc_accept_unlink(new_sk); 1197 if (new_sk->sk_state == SMC_CLOSED) { 1198 new_sk->sk_prot->unhash(new_sk); 1199 if (isk->clcsock) { 1200 sock_release(isk->clcsock); 1201 isk->clcsock = NULL; 1202 } 1203 sock_put(new_sk); /* final */ 1204 continue; 1205 } 1206 if (new_sock) { 1207 sock_graft(new_sk, new_sock); 1208 if (isk->use_fallback) { 1209 smc_sk(new_sk)->clcsock->file = new_sock->file; 1210 isk->clcsock->file->private_data = isk->clcsock; 1211 } 1212 } 1213 return new_sk; 1214 } 1215 return NULL; 1216 } 1217 1218 /* clean up for a created but never accepted sock */ 1219 void smc_close_non_accepted(struct sock *sk) 1220 { 1221 struct smc_sock *smc = smc_sk(sk); 1222 1223 sock_hold(sk); /* sock_put below */ 1224 lock_sock(sk); 1225 if (!sk->sk_lingertime) 1226 /* wait for peer closing */ 1227 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1228 __smc_release(smc); 1229 release_sock(sk); 1230 sock_put(sk); /* sock_hold above */ 1231 sock_put(sk); /* final sock_put */ 1232 } 1233 1234 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1235 { 1236 struct smc_link *link = smc->conn.lnk; 1237 struct smc_llc_qentry *qentry; 1238 int rc; 1239 1240 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1241 return SMC_CLC_DECL_ERR_REGRMB; 1242 1243 /* send CONFIRM LINK request to client over the RoCE fabric */ 1244 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1245 if (rc < 0) 1246 return SMC_CLC_DECL_TIMEOUT_CL; 1247 1248 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1249 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1250 SMC_LLC_CONFIRM_LINK); 1251 if (!qentry) { 1252 struct smc_clc_msg_decline dclc; 1253 1254 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1255 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1256 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1257 } 1258 smc_llc_save_peer_uid(qentry); 1259 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1260 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1261 if (rc) 1262 return SMC_CLC_DECL_RMBE_EC; 1263 1264 /* confirm_rkey is implicit on 1st contact */ 1265 smc->conn.rmb_desc->is_conf_rkey = true; 1266 1267 smc_llc_link_active(link); 1268 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1269 1270 /* initial contact - try to establish second link */ 1271 smc_llc_srv_add_link(link); 1272 return 0; 1273 } 1274 1275 /* listen worker: finish */ 1276 static void smc_listen_out(struct smc_sock *new_smc) 1277 { 1278 struct smc_sock *lsmc = new_smc->listen_smc; 1279 struct sock *newsmcsk = &new_smc->sk; 1280 1281 if (lsmc->sk.sk_state == SMC_LISTEN) { 1282 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1283 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1284 release_sock(&lsmc->sk); 1285 } else { /* no longer listening */ 1286 smc_close_non_accepted(newsmcsk); 1287 } 1288 1289 /* Wake up accept */ 1290 lsmc->sk.sk_data_ready(&lsmc->sk); 1291 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1292 } 1293 1294 /* listen worker: finish in state connected */ 1295 static void smc_listen_out_connected(struct smc_sock *new_smc) 1296 { 1297 struct sock *newsmcsk = &new_smc->sk; 1298 1299 sk_refcnt_debug_inc(newsmcsk); 1300 if (newsmcsk->sk_state == SMC_INIT) 1301 newsmcsk->sk_state = SMC_ACTIVE; 1302 1303 smc_listen_out(new_smc); 1304 } 1305 1306 /* listen worker: finish in error state */ 1307 static void smc_listen_out_err(struct smc_sock *new_smc) 1308 { 1309 struct sock *newsmcsk = &new_smc->sk; 1310 1311 if (newsmcsk->sk_state == SMC_INIT) 1312 sock_put(&new_smc->sk); /* passive closing */ 1313 newsmcsk->sk_state = SMC_CLOSED; 1314 1315 smc_listen_out(new_smc); 1316 } 1317 1318 /* listen worker: decline and fall back if possible */ 1319 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1320 int local_first, u8 version) 1321 { 1322 /* RDMA setup failed, switch back to TCP */ 1323 if (local_first) 1324 smc_lgr_cleanup_early(&new_smc->conn); 1325 else 1326 smc_conn_free(&new_smc->conn); 1327 if (reason_code < 0) { /* error, no fallback possible */ 1328 smc_listen_out_err(new_smc); 1329 return; 1330 } 1331 smc_switch_to_fallback(new_smc); 1332 new_smc->fallback_rsn = reason_code; 1333 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1334 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1335 smc_listen_out_err(new_smc); 1336 return; 1337 } 1338 } 1339 smc_listen_out_connected(new_smc); 1340 } 1341 1342 /* listen worker: version checking */ 1343 static int smc_listen_v2_check(struct smc_sock *new_smc, 1344 struct smc_clc_msg_proposal *pclc, 1345 struct smc_init_info *ini) 1346 { 1347 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1348 struct smc_clc_v2_extension *pclc_v2_ext; 1349 int rc = SMC_CLC_DECL_PEERNOSMC; 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 (!(ini->smcd_version & SMC_V2)) { 1358 rc = SMC_CLC_DECL_PEERNOSMC; 1359 goto out; 1360 } 1361 if (!smc_ism_v2_capable) { 1362 ini->smcd_version &= ~SMC_V2; 1363 rc = SMC_CLC_DECL_NOISM2SUPP; 1364 goto out; 1365 } 1366 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1367 if (!pclc_v2_ext) { 1368 ini->smcd_version &= ~SMC_V2; 1369 rc = SMC_CLC_DECL_NOV2EXT; 1370 goto out; 1371 } 1372 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1373 if (!pclc_smcd_v2_ext) { 1374 ini->smcd_version &= ~SMC_V2; 1375 rc = SMC_CLC_DECL_NOV2DEXT; 1376 } 1377 1378 out: 1379 if (!ini->smcd_version) 1380 return rc; 1381 1382 return 0; 1383 } 1384 1385 /* listen worker: check prefixes */ 1386 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1387 struct smc_clc_msg_proposal *pclc) 1388 { 1389 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1390 struct socket *newclcsock = new_smc->clcsock; 1391 1392 if (pclc->hdr.typev1 == SMC_TYPE_N) 1393 return 0; 1394 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1395 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1396 return SMC_CLC_DECL_DIFFPREFIX; 1397 1398 return 0; 1399 } 1400 1401 /* listen worker: initialize connection and buffers */ 1402 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1403 struct smc_init_info *ini) 1404 { 1405 int rc; 1406 1407 /* allocate connection / link group */ 1408 rc = smc_conn_create(new_smc, ini); 1409 if (rc) 1410 return rc; 1411 1412 /* create send buffer and rmb */ 1413 if (smc_buf_create(new_smc, false)) 1414 return SMC_CLC_DECL_MEM; 1415 1416 return 0; 1417 } 1418 1419 /* listen worker: initialize connection and buffers for SMC-D */ 1420 static int smc_listen_ism_init(struct smc_sock *new_smc, 1421 struct smc_init_info *ini) 1422 { 1423 int rc; 1424 1425 rc = smc_conn_create(new_smc, ini); 1426 if (rc) 1427 return rc; 1428 1429 /* Create send and receive buffers */ 1430 rc = smc_buf_create(new_smc, true); 1431 if (rc) { 1432 if (ini->first_contact_local) 1433 smc_lgr_cleanup_early(&new_smc->conn); 1434 else 1435 smc_conn_free(&new_smc->conn); 1436 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1437 SMC_CLC_DECL_MEM; 1438 } 1439 1440 return 0; 1441 } 1442 1443 static bool smc_is_already_selected(struct smcd_dev *smcd, 1444 struct smc_init_info *ini, 1445 int matches) 1446 { 1447 int i; 1448 1449 for (i = 0; i < matches; i++) 1450 if (smcd == ini->ism_dev[i]) 1451 return true; 1452 1453 return false; 1454 } 1455 1456 /* check for ISM devices matching proposed ISM devices */ 1457 static void smc_check_ism_v2_match(struct smc_init_info *ini, 1458 u16 proposed_chid, u64 proposed_gid, 1459 unsigned int *matches) 1460 { 1461 struct smcd_dev *smcd; 1462 1463 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1464 if (smcd->going_away) 1465 continue; 1466 if (smc_is_already_selected(smcd, ini, *matches)) 1467 continue; 1468 if (smc_ism_get_chid(smcd) == proposed_chid && 1469 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1470 ini->ism_peer_gid[*matches] = proposed_gid; 1471 ini->ism_dev[*matches] = smcd; 1472 (*matches)++; 1473 break; 1474 } 1475 } 1476 } 1477 1478 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 1479 { 1480 if (!ini->rc) 1481 ini->rc = rc; 1482 } 1483 1484 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1485 struct smc_clc_msg_proposal *pclc, 1486 struct smc_init_info *ini) 1487 { 1488 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1489 struct smc_clc_v2_extension *smc_v2_ext; 1490 struct smc_clc_msg_smcd *pclc_smcd; 1491 unsigned int matches = 0; 1492 u8 smcd_version; 1493 u8 *eid = NULL; 1494 int i, rc; 1495 1496 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1497 goto not_found; 1498 1499 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1500 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1501 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1502 if (!smcd_v2_ext || 1503 !smc_v2_ext->hdr.flag.seid) { /* no system EID support for SMCD */ 1504 smc_find_ism_store_rc(SMC_CLC_DECL_NOSEID, ini); 1505 goto not_found; 1506 } 1507 1508 mutex_lock(&smcd_dev_list.mutex); 1509 if (pclc_smcd->ism.chid) 1510 /* check for ISM device matching proposed native ISM device */ 1511 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1512 ntohll(pclc_smcd->ism.gid), &matches); 1513 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1514 /* check for ISM devices matching proposed non-native ISM 1515 * devices 1516 */ 1517 smc_check_ism_v2_match(ini, 1518 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1519 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1520 &matches); 1521 } 1522 mutex_unlock(&smcd_dev_list.mutex); 1523 1524 if (ini->ism_dev[0]) { 1525 smc_ism_get_system_eid(ini->ism_dev[0], &eid); 1526 if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN)) 1527 goto not_found; 1528 } else { 1529 goto not_found; 1530 } 1531 1532 /* separate - outside the smcd_dev_list.lock */ 1533 smcd_version = ini->smcd_version; 1534 for (i = 0; i < matches; i++) { 1535 ini->smcd_version = SMC_V2; 1536 ini->is_smcd = true; 1537 ini->ism_selected = i; 1538 rc = smc_listen_ism_init(new_smc, ini); 1539 if (rc) { 1540 smc_find_ism_store_rc(rc, ini); 1541 /* try next active ISM device */ 1542 continue; 1543 } 1544 return; /* matching and usable V2 ISM device found */ 1545 } 1546 /* no V2 ISM device could be initialized */ 1547 ini->smcd_version = smcd_version; /* restore original value */ 1548 1549 not_found: 1550 ini->smcd_version &= ~SMC_V2; 1551 ini->ism_dev[0] = NULL; 1552 ini->is_smcd = false; 1553 } 1554 1555 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1556 struct smc_clc_msg_proposal *pclc, 1557 struct smc_init_info *ini) 1558 { 1559 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1560 int rc = 0; 1561 1562 /* check if ISM V1 is available */ 1563 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1564 goto not_found; 1565 ini->is_smcd = true; /* prepare ISM check */ 1566 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1567 rc = smc_find_ism_device(new_smc, ini); 1568 if (rc) 1569 goto not_found; 1570 ini->ism_selected = 0; 1571 rc = smc_listen_ism_init(new_smc, ini); 1572 if (!rc) 1573 return; /* V1 ISM device found */ 1574 1575 not_found: 1576 smc_find_ism_store_rc(rc, ini); 1577 ini->ism_dev[0] = NULL; 1578 ini->is_smcd = false; 1579 } 1580 1581 /* listen worker: register buffers */ 1582 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1583 { 1584 struct smc_connection *conn = &new_smc->conn; 1585 1586 if (!local_first) { 1587 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1588 return SMC_CLC_DECL_ERR_REGRMB; 1589 } 1590 smc_rmb_sync_sg_for_device(&new_smc->conn); 1591 1592 return 0; 1593 } 1594 1595 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1596 struct smc_clc_msg_proposal *pclc, 1597 struct smc_init_info *ini) 1598 { 1599 int rc; 1600 1601 if (!smcr_indicated(ini->smc_type_v1)) 1602 return SMC_CLC_DECL_NOSMCDEV; 1603 1604 /* prepare RDMA check */ 1605 ini->ib_lcl = &pclc->lcl; 1606 rc = smc_find_rdma_device(new_smc, ini); 1607 if (rc) { 1608 /* no RDMA device found */ 1609 if (ini->smc_type_v1 == SMC_TYPE_B) 1610 /* neither ISM nor RDMA device found */ 1611 rc = SMC_CLC_DECL_NOSMCDEV; 1612 return rc; 1613 } 1614 rc = smc_listen_rdma_init(new_smc, ini); 1615 if (rc) 1616 return rc; 1617 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1618 } 1619 1620 /* determine the local device matching to proposal */ 1621 static int smc_listen_find_device(struct smc_sock *new_smc, 1622 struct smc_clc_msg_proposal *pclc, 1623 struct smc_init_info *ini) 1624 { 1625 int rc; 1626 1627 /* check for ISM device matching V2 proposed device */ 1628 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 1629 if (ini->ism_dev[0]) 1630 return 0; 1631 1632 if (!(ini->smcd_version & SMC_V1)) 1633 return ini->rc ?: SMC_CLC_DECL_NOSMCD2DEV; 1634 1635 /* check for matching IP prefix and subnet length */ 1636 rc = smc_listen_prfx_check(new_smc, pclc); 1637 if (rc) 1638 return ini->rc ?: rc; 1639 1640 /* get vlan id from IP device */ 1641 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 1642 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 1643 1644 /* check for ISM device matching V1 proposed device */ 1645 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 1646 if (ini->ism_dev[0]) 1647 return 0; 1648 1649 if (pclc->hdr.typev1 == SMC_TYPE_D) 1650 /* skip RDMA and decline */ 1651 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 1652 1653 /* check if RDMA is available */ 1654 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 1655 smc_find_ism_store_rc(rc, ini); 1656 1657 return (!rc) ? 0 : ini->rc; 1658 } 1659 1660 /* listen worker: finish RDMA setup */ 1661 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 1662 struct smc_clc_msg_accept_confirm *cclc, 1663 bool local_first) 1664 { 1665 struct smc_link *link = new_smc->conn.lnk; 1666 int reason_code = 0; 1667 1668 if (local_first) 1669 smc_link_save_peer_info(link, cclc); 1670 1671 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 1672 return SMC_CLC_DECL_ERR_RTOK; 1673 1674 if (local_first) { 1675 if (smc_ib_ready_link(link)) 1676 return SMC_CLC_DECL_ERR_RDYLNK; 1677 /* QP confirmation over RoCE fabric */ 1678 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1679 reason_code = smcr_serv_conf_first_link(new_smc); 1680 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1681 } 1682 return reason_code; 1683 } 1684 1685 /* setup for connection of server */ 1686 static void smc_listen_work(struct work_struct *work) 1687 { 1688 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1689 smc_listen_work); 1690 u8 version = smc_ism_v2_capable ? SMC_V2 : SMC_V1; 1691 struct socket *newclcsock = new_smc->clcsock; 1692 struct smc_clc_msg_accept_confirm *cclc; 1693 struct smc_clc_msg_proposal_area *buf; 1694 struct smc_clc_msg_proposal *pclc; 1695 struct smc_init_info *ini = NULL; 1696 int rc = 0; 1697 1698 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 1699 return smc_listen_out_err(new_smc); 1700 1701 if (new_smc->use_fallback) { 1702 smc_listen_out_connected(new_smc); 1703 return; 1704 } 1705 1706 /* check if peer is smc capable */ 1707 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1708 smc_switch_to_fallback(new_smc); 1709 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; 1710 smc_listen_out_connected(new_smc); 1711 return; 1712 } 1713 1714 /* do inband token exchange - 1715 * wait for and receive SMC Proposal CLC message 1716 */ 1717 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 1718 if (!buf) { 1719 rc = SMC_CLC_DECL_MEM; 1720 goto out_decl; 1721 } 1722 pclc = (struct smc_clc_msg_proposal *)buf; 1723 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 1724 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 1725 if (rc) 1726 goto out_decl; 1727 version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version; 1728 1729 /* IPSec connections opt out of SMC optimizations */ 1730 if (using_ipsec(new_smc)) { 1731 rc = SMC_CLC_DECL_IPSEC; 1732 goto out_decl; 1733 } 1734 1735 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1736 if (!ini) { 1737 rc = SMC_CLC_DECL_MEM; 1738 goto out_decl; 1739 } 1740 1741 /* initial version checking */ 1742 rc = smc_listen_v2_check(new_smc, pclc, ini); 1743 if (rc) 1744 goto out_decl; 1745 1746 mutex_lock(&smc_server_lgr_pending); 1747 smc_close_init(new_smc); 1748 smc_rx_init(new_smc); 1749 smc_tx_init(new_smc); 1750 1751 /* determine ISM or RoCE device used for connection */ 1752 rc = smc_listen_find_device(new_smc, pclc, ini); 1753 if (rc) 1754 goto out_unlock; 1755 1756 /* send SMC Accept CLC message */ 1757 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 1758 ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1); 1759 if (rc) 1760 goto out_unlock; 1761 1762 /* SMC-D does not need this lock any more */ 1763 if (ini->is_smcd) 1764 mutex_unlock(&smc_server_lgr_pending); 1765 1766 /* receive SMC Confirm CLC message */ 1767 memset(buf, 0, sizeof(*buf)); 1768 cclc = (struct smc_clc_msg_accept_confirm *)buf; 1769 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 1770 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 1771 if (rc) { 1772 if (!ini->is_smcd) 1773 goto out_unlock; 1774 goto out_decl; 1775 } 1776 1777 /* finish worker */ 1778 if (!ini->is_smcd) { 1779 rc = smc_listen_rdma_finish(new_smc, cclc, 1780 ini->first_contact_local); 1781 if (rc) 1782 goto out_unlock; 1783 mutex_unlock(&smc_server_lgr_pending); 1784 } 1785 smc_conn_save_peer_info(new_smc, cclc); 1786 smc_listen_out_connected(new_smc); 1787 goto out_free; 1788 1789 out_unlock: 1790 mutex_unlock(&smc_server_lgr_pending); 1791 out_decl: 1792 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 1793 version); 1794 out_free: 1795 kfree(ini); 1796 kfree(buf); 1797 } 1798 1799 static void smc_tcp_listen_work(struct work_struct *work) 1800 { 1801 struct smc_sock *lsmc = container_of(work, struct smc_sock, 1802 tcp_listen_work); 1803 struct sock *lsk = &lsmc->sk; 1804 struct smc_sock *new_smc; 1805 int rc = 0; 1806 1807 lock_sock(lsk); 1808 while (lsk->sk_state == SMC_LISTEN) { 1809 rc = smc_clcsock_accept(lsmc, &new_smc); 1810 if (rc) /* clcsock accept queue empty or error */ 1811 goto out; 1812 if (!new_smc) 1813 continue; 1814 1815 new_smc->listen_smc = lsmc; 1816 new_smc->use_fallback = lsmc->use_fallback; 1817 new_smc->fallback_rsn = lsmc->fallback_rsn; 1818 sock_hold(lsk); /* sock_put in smc_listen_work */ 1819 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 1820 smc_copy_sock_settings_to_smc(new_smc); 1821 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 1822 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 1823 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 1824 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 1825 sock_put(&new_smc->sk); 1826 } 1827 1828 out: 1829 release_sock(lsk); 1830 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 1831 } 1832 1833 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 1834 { 1835 struct smc_sock *lsmc; 1836 1837 lsmc = (struct smc_sock *) 1838 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY); 1839 if (!lsmc) 1840 return; 1841 lsmc->clcsk_data_ready(listen_clcsock); 1842 if (lsmc->sk.sk_state == SMC_LISTEN) { 1843 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 1844 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 1845 sock_put(&lsmc->sk); 1846 } 1847 } 1848 1849 static int smc_listen(struct socket *sock, int backlog) 1850 { 1851 struct sock *sk = sock->sk; 1852 struct smc_sock *smc; 1853 int rc; 1854 1855 smc = smc_sk(sk); 1856 lock_sock(sk); 1857 1858 rc = -EINVAL; 1859 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 1860 smc->connect_nonblock) 1861 goto out; 1862 1863 rc = 0; 1864 if (sk->sk_state == SMC_LISTEN) { 1865 sk->sk_max_ack_backlog = backlog; 1866 goto out; 1867 } 1868 /* some socket options are handled in core, so we could not apply 1869 * them to the clc socket -- copy smc socket options to clc socket 1870 */ 1871 smc_copy_sock_settings_to_clc(smc); 1872 if (!smc->use_fallback) 1873 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1874 1875 /* save original sk_data_ready function and establish 1876 * smc-specific sk_data_ready function 1877 */ 1878 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 1879 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 1880 smc->clcsock->sk->sk_user_data = 1881 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 1882 rc = kernel_listen(smc->clcsock, backlog); 1883 if (rc) 1884 goto out; 1885 sk->sk_max_ack_backlog = backlog; 1886 sk->sk_ack_backlog = 0; 1887 sk->sk_state = SMC_LISTEN; 1888 1889 out: 1890 release_sock(sk); 1891 return rc; 1892 } 1893 1894 static int smc_accept(struct socket *sock, struct socket *new_sock, 1895 int flags, bool kern) 1896 { 1897 struct sock *sk = sock->sk, *nsk; 1898 DECLARE_WAITQUEUE(wait, current); 1899 struct smc_sock *lsmc; 1900 long timeo; 1901 int rc = 0; 1902 1903 lsmc = smc_sk(sk); 1904 sock_hold(sk); /* sock_put below */ 1905 lock_sock(sk); 1906 1907 if (lsmc->sk.sk_state != SMC_LISTEN) { 1908 rc = -EINVAL; 1909 release_sock(sk); 1910 goto out; 1911 } 1912 1913 /* Wait for an incoming connection */ 1914 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1915 add_wait_queue_exclusive(sk_sleep(sk), &wait); 1916 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 1917 set_current_state(TASK_INTERRUPTIBLE); 1918 if (!timeo) { 1919 rc = -EAGAIN; 1920 break; 1921 } 1922 release_sock(sk); 1923 timeo = schedule_timeout(timeo); 1924 /* wakeup by sk_data_ready in smc_listen_work() */ 1925 sched_annotate_sleep(); 1926 lock_sock(sk); 1927 if (signal_pending(current)) { 1928 rc = sock_intr_errno(timeo); 1929 break; 1930 } 1931 } 1932 set_current_state(TASK_RUNNING); 1933 remove_wait_queue(sk_sleep(sk), &wait); 1934 1935 if (!rc) 1936 rc = sock_error(nsk); 1937 release_sock(sk); 1938 if (rc) 1939 goto out; 1940 1941 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 1942 /* wait till data arrives on the socket */ 1943 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 1944 MSEC_PER_SEC); 1945 if (smc_sk(nsk)->use_fallback) { 1946 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 1947 1948 lock_sock(clcsk); 1949 if (skb_queue_empty(&clcsk->sk_receive_queue)) 1950 sk_wait_data(clcsk, &timeo, NULL); 1951 release_sock(clcsk); 1952 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 1953 lock_sock(nsk); 1954 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 1955 release_sock(nsk); 1956 } 1957 } 1958 1959 out: 1960 sock_put(sk); /* sock_hold above */ 1961 return rc; 1962 } 1963 1964 static int smc_getname(struct socket *sock, struct sockaddr *addr, 1965 int peer) 1966 { 1967 struct smc_sock *smc; 1968 1969 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 1970 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 1971 return -ENOTCONN; 1972 1973 smc = smc_sk(sock->sk); 1974 1975 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 1976 } 1977 1978 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1979 { 1980 struct sock *sk = sock->sk; 1981 struct smc_sock *smc; 1982 int rc = -EPIPE; 1983 1984 smc = smc_sk(sk); 1985 lock_sock(sk); 1986 if ((sk->sk_state != SMC_ACTIVE) && 1987 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1988 (sk->sk_state != SMC_INIT)) 1989 goto out; 1990 1991 if (msg->msg_flags & MSG_FASTOPEN) { 1992 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 1993 smc_switch_to_fallback(smc); 1994 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 1995 } else { 1996 rc = -EINVAL; 1997 goto out; 1998 } 1999 } 2000 2001 if (smc->use_fallback) 2002 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2003 else 2004 rc = smc_tx_sendmsg(smc, msg, len); 2005 out: 2006 release_sock(sk); 2007 return rc; 2008 } 2009 2010 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2011 int flags) 2012 { 2013 struct sock *sk = sock->sk; 2014 struct smc_sock *smc; 2015 int rc = -ENOTCONN; 2016 2017 smc = smc_sk(sk); 2018 lock_sock(sk); 2019 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2020 /* socket was connected before, no more data to read */ 2021 rc = 0; 2022 goto out; 2023 } 2024 if ((sk->sk_state == SMC_INIT) || 2025 (sk->sk_state == SMC_LISTEN) || 2026 (sk->sk_state == SMC_CLOSED)) 2027 goto out; 2028 2029 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2030 rc = 0; 2031 goto out; 2032 } 2033 2034 if (smc->use_fallback) { 2035 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2036 } else { 2037 msg->msg_namelen = 0; 2038 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2039 } 2040 2041 out: 2042 release_sock(sk); 2043 return rc; 2044 } 2045 2046 static __poll_t smc_accept_poll(struct sock *parent) 2047 { 2048 struct smc_sock *isk = smc_sk(parent); 2049 __poll_t mask = 0; 2050 2051 spin_lock(&isk->accept_q_lock); 2052 if (!list_empty(&isk->accept_q)) 2053 mask = EPOLLIN | EPOLLRDNORM; 2054 spin_unlock(&isk->accept_q_lock); 2055 2056 return mask; 2057 } 2058 2059 static __poll_t smc_poll(struct file *file, struct socket *sock, 2060 poll_table *wait) 2061 { 2062 struct sock *sk = sock->sk; 2063 struct smc_sock *smc; 2064 __poll_t mask = 0; 2065 2066 if (!sk) 2067 return EPOLLNVAL; 2068 2069 smc = smc_sk(sock->sk); 2070 if (smc->use_fallback) { 2071 /* delegate to CLC child sock */ 2072 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2073 sk->sk_err = smc->clcsock->sk->sk_err; 2074 } else { 2075 if (sk->sk_state != SMC_CLOSED) 2076 sock_poll_wait(file, sock, wait); 2077 if (sk->sk_err) 2078 mask |= EPOLLERR; 2079 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2080 (sk->sk_state == SMC_CLOSED)) 2081 mask |= EPOLLHUP; 2082 if (sk->sk_state == SMC_LISTEN) { 2083 /* woken up by sk_data_ready in smc_listen_work() */ 2084 mask |= smc_accept_poll(sk); 2085 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2086 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2087 wait); 2088 sk->sk_err = smc->clcsock->sk->sk_err; 2089 } else { 2090 if ((sk->sk_state != SMC_INIT && 2091 atomic_read(&smc->conn.sndbuf_space)) || 2092 sk->sk_shutdown & SEND_SHUTDOWN) { 2093 mask |= EPOLLOUT | EPOLLWRNORM; 2094 } else { 2095 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2096 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2097 } 2098 if (atomic_read(&smc->conn.bytes_to_rcv)) 2099 mask |= EPOLLIN | EPOLLRDNORM; 2100 if (sk->sk_shutdown & RCV_SHUTDOWN) 2101 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2102 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2103 mask |= EPOLLIN; 2104 if (smc->conn.urg_state == SMC_URG_VALID) 2105 mask |= EPOLLPRI; 2106 } 2107 } 2108 2109 return mask; 2110 } 2111 2112 static int smc_shutdown(struct socket *sock, int how) 2113 { 2114 struct sock *sk = sock->sk; 2115 struct smc_sock *smc; 2116 int rc = -EINVAL; 2117 int rc1 = 0; 2118 2119 smc = smc_sk(sk); 2120 2121 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2122 return rc; 2123 2124 lock_sock(sk); 2125 2126 rc = -ENOTCONN; 2127 if ((sk->sk_state != SMC_ACTIVE) && 2128 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2129 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2130 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2131 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2132 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2133 goto out; 2134 if (smc->use_fallback) { 2135 rc = kernel_sock_shutdown(smc->clcsock, how); 2136 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2137 if (sk->sk_shutdown == SHUTDOWN_MASK) 2138 sk->sk_state = SMC_CLOSED; 2139 goto out; 2140 } 2141 switch (how) { 2142 case SHUT_RDWR: /* shutdown in both directions */ 2143 rc = smc_close_active(smc); 2144 break; 2145 case SHUT_WR: 2146 rc = smc_close_shutdown_write(smc); 2147 break; 2148 case SHUT_RD: 2149 rc = 0; 2150 /* nothing more to do because peer is not involved */ 2151 break; 2152 } 2153 if (smc->clcsock) 2154 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2155 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2156 sk->sk_shutdown |= how + 1; 2157 2158 out: 2159 release_sock(sk); 2160 return rc ? rc : rc1; 2161 } 2162 2163 static int smc_setsockopt(struct socket *sock, int level, int optname, 2164 sockptr_t optval, unsigned int optlen) 2165 { 2166 struct sock *sk = sock->sk; 2167 struct smc_sock *smc; 2168 int val, rc; 2169 2170 smc = smc_sk(sk); 2171 2172 /* generic setsockopts reaching us here always apply to the 2173 * CLC socket 2174 */ 2175 if (unlikely(!smc->clcsock->ops->setsockopt)) 2176 rc = -EOPNOTSUPP; 2177 else 2178 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2179 optval, optlen); 2180 if (smc->clcsock->sk->sk_err) { 2181 sk->sk_err = smc->clcsock->sk->sk_err; 2182 sk->sk_error_report(sk); 2183 } 2184 2185 if (optlen < sizeof(int)) 2186 return -EINVAL; 2187 if (copy_from_sockptr(&val, optval, sizeof(int))) 2188 return -EFAULT; 2189 2190 lock_sock(sk); 2191 if (rc || smc->use_fallback) 2192 goto out; 2193 switch (optname) { 2194 case TCP_ULP: 2195 case TCP_FASTOPEN: 2196 case TCP_FASTOPEN_CONNECT: 2197 case TCP_FASTOPEN_KEY: 2198 case TCP_FASTOPEN_NO_COOKIE: 2199 /* option not supported by SMC */ 2200 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2201 smc_switch_to_fallback(smc); 2202 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 2203 } else { 2204 rc = -EINVAL; 2205 } 2206 break; 2207 case TCP_NODELAY: 2208 if (sk->sk_state != SMC_INIT && 2209 sk->sk_state != SMC_LISTEN && 2210 sk->sk_state != SMC_CLOSED) { 2211 if (val) 2212 mod_delayed_work(smc->conn.lgr->tx_wq, 2213 &smc->conn.tx_work, 0); 2214 } 2215 break; 2216 case TCP_CORK: 2217 if (sk->sk_state != SMC_INIT && 2218 sk->sk_state != SMC_LISTEN && 2219 sk->sk_state != SMC_CLOSED) { 2220 if (!val) 2221 mod_delayed_work(smc->conn.lgr->tx_wq, 2222 &smc->conn.tx_work, 0); 2223 } 2224 break; 2225 case TCP_DEFER_ACCEPT: 2226 smc->sockopt_defer_accept = val; 2227 break; 2228 default: 2229 break; 2230 } 2231 out: 2232 release_sock(sk); 2233 2234 return rc; 2235 } 2236 2237 static int smc_getsockopt(struct socket *sock, int level, int optname, 2238 char __user *optval, int __user *optlen) 2239 { 2240 struct smc_sock *smc; 2241 2242 smc = smc_sk(sock->sk); 2243 /* socket options apply to the CLC socket */ 2244 if (unlikely(!smc->clcsock->ops->getsockopt)) 2245 return -EOPNOTSUPP; 2246 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2247 optval, optlen); 2248 } 2249 2250 static int smc_ioctl(struct socket *sock, unsigned int cmd, 2251 unsigned long arg) 2252 { 2253 union smc_host_cursor cons, urg; 2254 struct smc_connection *conn; 2255 struct smc_sock *smc; 2256 int answ; 2257 2258 smc = smc_sk(sock->sk); 2259 conn = &smc->conn; 2260 lock_sock(&smc->sk); 2261 if (smc->use_fallback) { 2262 if (!smc->clcsock) { 2263 release_sock(&smc->sk); 2264 return -EBADF; 2265 } 2266 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2267 release_sock(&smc->sk); 2268 return answ; 2269 } 2270 switch (cmd) { 2271 case SIOCINQ: /* same as FIONREAD */ 2272 if (smc->sk.sk_state == SMC_LISTEN) { 2273 release_sock(&smc->sk); 2274 return -EINVAL; 2275 } 2276 if (smc->sk.sk_state == SMC_INIT || 2277 smc->sk.sk_state == SMC_CLOSED) 2278 answ = 0; 2279 else 2280 answ = atomic_read(&smc->conn.bytes_to_rcv); 2281 break; 2282 case SIOCOUTQ: 2283 /* output queue size (not send + not acked) */ 2284 if (smc->sk.sk_state == SMC_LISTEN) { 2285 release_sock(&smc->sk); 2286 return -EINVAL; 2287 } 2288 if (smc->sk.sk_state == SMC_INIT || 2289 smc->sk.sk_state == SMC_CLOSED) 2290 answ = 0; 2291 else 2292 answ = smc->conn.sndbuf_desc->len - 2293 atomic_read(&smc->conn.sndbuf_space); 2294 break; 2295 case SIOCOUTQNSD: 2296 /* output queue size (not send only) */ 2297 if (smc->sk.sk_state == SMC_LISTEN) { 2298 release_sock(&smc->sk); 2299 return -EINVAL; 2300 } 2301 if (smc->sk.sk_state == SMC_INIT || 2302 smc->sk.sk_state == SMC_CLOSED) 2303 answ = 0; 2304 else 2305 answ = smc_tx_prepared_sends(&smc->conn); 2306 break; 2307 case SIOCATMARK: 2308 if (smc->sk.sk_state == SMC_LISTEN) { 2309 release_sock(&smc->sk); 2310 return -EINVAL; 2311 } 2312 if (smc->sk.sk_state == SMC_INIT || 2313 smc->sk.sk_state == SMC_CLOSED) { 2314 answ = 0; 2315 } else { 2316 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2317 smc_curs_copy(&urg, &conn->urg_curs, conn); 2318 answ = smc_curs_diff(conn->rmb_desc->len, 2319 &cons, &urg) == 1; 2320 } 2321 break; 2322 default: 2323 release_sock(&smc->sk); 2324 return -ENOIOCTLCMD; 2325 } 2326 release_sock(&smc->sk); 2327 2328 return put_user(answ, (int __user *)arg); 2329 } 2330 2331 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2332 int offset, size_t size, int flags) 2333 { 2334 struct sock *sk = sock->sk; 2335 struct smc_sock *smc; 2336 int rc = -EPIPE; 2337 2338 smc = smc_sk(sk); 2339 lock_sock(sk); 2340 if (sk->sk_state != SMC_ACTIVE) { 2341 release_sock(sk); 2342 goto out; 2343 } 2344 release_sock(sk); 2345 if (smc->use_fallback) 2346 rc = kernel_sendpage(smc->clcsock, page, offset, 2347 size, flags); 2348 else 2349 rc = sock_no_sendpage(sock, page, offset, size, flags); 2350 2351 out: 2352 return rc; 2353 } 2354 2355 /* Map the affected portions of the rmbe into an spd, note the number of bytes 2356 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2357 * updates till whenever a respective page has been fully processed. 2358 * Note that subsequent recv() calls have to wait till all splice() processing 2359 * completed. 2360 */ 2361 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2362 struct pipe_inode_info *pipe, size_t len, 2363 unsigned int flags) 2364 { 2365 struct sock *sk = sock->sk; 2366 struct smc_sock *smc; 2367 int rc = -ENOTCONN; 2368 2369 smc = smc_sk(sk); 2370 lock_sock(sk); 2371 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2372 /* socket was connected before, no more data to read */ 2373 rc = 0; 2374 goto out; 2375 } 2376 if (sk->sk_state == SMC_INIT || 2377 sk->sk_state == SMC_LISTEN || 2378 sk->sk_state == SMC_CLOSED) 2379 goto out; 2380 2381 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2382 rc = 0; 2383 goto out; 2384 } 2385 2386 if (smc->use_fallback) { 2387 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2388 pipe, len, flags); 2389 } else { 2390 if (*ppos) { 2391 rc = -ESPIPE; 2392 goto out; 2393 } 2394 if (flags & SPLICE_F_NONBLOCK) 2395 flags = MSG_DONTWAIT; 2396 else 2397 flags = 0; 2398 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2399 } 2400 out: 2401 release_sock(sk); 2402 2403 return rc; 2404 } 2405 2406 /* must look like tcp */ 2407 static const struct proto_ops smc_sock_ops = { 2408 .family = PF_SMC, 2409 .owner = THIS_MODULE, 2410 .release = smc_release, 2411 .bind = smc_bind, 2412 .connect = smc_connect, 2413 .socketpair = sock_no_socketpair, 2414 .accept = smc_accept, 2415 .getname = smc_getname, 2416 .poll = smc_poll, 2417 .ioctl = smc_ioctl, 2418 .listen = smc_listen, 2419 .shutdown = smc_shutdown, 2420 .setsockopt = smc_setsockopt, 2421 .getsockopt = smc_getsockopt, 2422 .sendmsg = smc_sendmsg, 2423 .recvmsg = smc_recvmsg, 2424 .mmap = sock_no_mmap, 2425 .sendpage = smc_sendpage, 2426 .splice_read = smc_splice_read, 2427 }; 2428 2429 static int smc_create(struct net *net, struct socket *sock, int protocol, 2430 int kern) 2431 { 2432 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2433 struct smc_sock *smc; 2434 struct sock *sk; 2435 int rc; 2436 2437 rc = -ESOCKTNOSUPPORT; 2438 if (sock->type != SOCK_STREAM) 2439 goto out; 2440 2441 rc = -EPROTONOSUPPORT; 2442 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2443 goto out; 2444 2445 rc = -ENOBUFS; 2446 sock->ops = &smc_sock_ops; 2447 sk = smc_sock_alloc(net, sock, protocol); 2448 if (!sk) 2449 goto out; 2450 2451 /* create internal TCP socket for CLC handshake and fallback */ 2452 smc = smc_sk(sk); 2453 smc->use_fallback = false; /* assume rdma capability first */ 2454 smc->fallback_rsn = 0; 2455 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2456 &smc->clcsock); 2457 if (rc) { 2458 sk_common_release(sk); 2459 goto out; 2460 } 2461 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2462 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2463 2464 out: 2465 return rc; 2466 } 2467 2468 static const struct net_proto_family smc_sock_family_ops = { 2469 .family = PF_SMC, 2470 .owner = THIS_MODULE, 2471 .create = smc_create, 2472 }; 2473 2474 unsigned int smc_net_id; 2475 2476 static __net_init int smc_net_init(struct net *net) 2477 { 2478 return smc_pnet_net_init(net); 2479 } 2480 2481 static void __net_exit smc_net_exit(struct net *net) 2482 { 2483 smc_pnet_net_exit(net); 2484 } 2485 2486 static struct pernet_operations smc_net_ops = { 2487 .init = smc_net_init, 2488 .exit = smc_net_exit, 2489 .id = &smc_net_id, 2490 .size = sizeof(struct smc_net), 2491 }; 2492 2493 static int __init smc_init(void) 2494 { 2495 int rc; 2496 2497 rc = register_pernet_subsys(&smc_net_ops); 2498 if (rc) 2499 return rc; 2500 2501 smc_ism_init(); 2502 smc_clc_init(); 2503 2504 rc = smc_pnet_init(); 2505 if (rc) 2506 goto out_pernet_subsys; 2507 2508 rc = -ENOMEM; 2509 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 2510 if (!smc_hs_wq) 2511 goto out_pnet; 2512 2513 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 2514 if (!smc_close_wq) 2515 goto out_alloc_hs_wq; 2516 2517 rc = smc_core_init(); 2518 if (rc) { 2519 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 2520 goto out_alloc_wqs; 2521 } 2522 2523 rc = smc_llc_init(); 2524 if (rc) { 2525 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 2526 goto out_core; 2527 } 2528 2529 rc = smc_cdc_init(); 2530 if (rc) { 2531 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 2532 goto out_core; 2533 } 2534 2535 rc = proto_register(&smc_proto, 1); 2536 if (rc) { 2537 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 2538 goto out_core; 2539 } 2540 2541 rc = proto_register(&smc_proto6, 1); 2542 if (rc) { 2543 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 2544 goto out_proto; 2545 } 2546 2547 rc = sock_register(&smc_sock_family_ops); 2548 if (rc) { 2549 pr_err("%s: sock_register fails with %d\n", __func__, rc); 2550 goto out_proto6; 2551 } 2552 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 2553 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 2554 2555 rc = smc_ib_register_client(); 2556 if (rc) { 2557 pr_err("%s: ib_register fails with %d\n", __func__, rc); 2558 goto out_sock; 2559 } 2560 2561 static_branch_enable(&tcp_have_smc); 2562 return 0; 2563 2564 out_sock: 2565 sock_unregister(PF_SMC); 2566 out_proto6: 2567 proto_unregister(&smc_proto6); 2568 out_proto: 2569 proto_unregister(&smc_proto); 2570 out_core: 2571 smc_core_exit(); 2572 out_alloc_wqs: 2573 destroy_workqueue(smc_close_wq); 2574 out_alloc_hs_wq: 2575 destroy_workqueue(smc_hs_wq); 2576 out_pnet: 2577 smc_pnet_exit(); 2578 out_pernet_subsys: 2579 unregister_pernet_subsys(&smc_net_ops); 2580 2581 return rc; 2582 } 2583 2584 static void __exit smc_exit(void) 2585 { 2586 static_branch_disable(&tcp_have_smc); 2587 sock_unregister(PF_SMC); 2588 smc_core_exit(); 2589 smc_ib_unregister_client(); 2590 destroy_workqueue(smc_close_wq); 2591 destroy_workqueue(smc_hs_wq); 2592 proto_unregister(&smc_proto6); 2593 proto_unregister(&smc_proto); 2594 smc_pnet_exit(); 2595 unregister_pernet_subsys(&smc_net_ops); 2596 rcu_barrier(); 2597 } 2598 2599 module_init(smc_init); 2600 module_exit(smc_exit); 2601 2602 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 2603 MODULE_DESCRIPTION("smc socket address family"); 2604 MODULE_LICENSE("GPL"); 2605 MODULE_ALIAS_NETPROTO(PF_SMC); 2606