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 if (smc->connect_info && sk->sk_state == SMC_INIT) 131 tcp_abort(smc->clcsock->sk, ECONNABORTED); 132 flush_work(&smc->connect_work); 133 kfree(smc->connect_info); 134 smc->connect_info = NULL; 135 136 if (sk->sk_state == SMC_LISTEN) 137 /* smc_close_non_accepted() is called and acquires 138 * sock lock for child sockets again 139 */ 140 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 141 else 142 lock_sock(sk); 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 } 149 if (smc->clcsock) { 150 sock_release(smc->clcsock); 151 smc->clcsock = NULL; 152 } 153 if (smc->use_fallback) { 154 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT) 155 sock_put(sk); /* passive closing */ 156 sk->sk_state = SMC_CLOSED; 157 sk->sk_state_change(sk); 158 } 159 160 /* detach socket */ 161 sock_orphan(sk); 162 sock->sk = NULL; 163 if (!smc->use_fallback && sk->sk_state == SMC_CLOSED) 164 smc_conn_free(&smc->conn); 165 release_sock(sk); 166 167 sk->sk_prot->unhash(sk); 168 sock_put(sk); /* final sock_put */ 169 out: 170 return rc; 171 } 172 173 static void smc_destruct(struct sock *sk) 174 { 175 if (sk->sk_state != SMC_CLOSED) 176 return; 177 if (!sock_flag(sk, SOCK_DEAD)) 178 return; 179 180 sk_refcnt_debug_dec(sk); 181 } 182 183 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 184 int protocol) 185 { 186 struct smc_sock *smc; 187 struct proto *prot; 188 struct sock *sk; 189 190 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 191 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 192 if (!sk) 193 return NULL; 194 195 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 196 sk->sk_state = SMC_INIT; 197 sk->sk_destruct = smc_destruct; 198 sk->sk_protocol = protocol; 199 smc = smc_sk(sk); 200 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 201 INIT_WORK(&smc->connect_work, smc_connect_work); 202 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 203 INIT_LIST_HEAD(&smc->accept_q); 204 spin_lock_init(&smc->accept_q_lock); 205 spin_lock_init(&smc->conn.send_lock); 206 sk->sk_prot->hash(sk); 207 sk_refcnt_debug_inc(sk); 208 209 return sk; 210 } 211 212 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 213 int addr_len) 214 { 215 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 216 struct sock *sk = sock->sk; 217 struct smc_sock *smc; 218 int rc; 219 220 smc = smc_sk(sk); 221 222 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 223 rc = -EINVAL; 224 if (addr_len < sizeof(struct sockaddr_in)) 225 goto out; 226 227 rc = -EAFNOSUPPORT; 228 if (addr->sin_family != AF_INET && 229 addr->sin_family != AF_INET6 && 230 addr->sin_family != AF_UNSPEC) 231 goto out; 232 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 233 if (addr->sin_family == AF_UNSPEC && 234 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 235 goto out; 236 237 lock_sock(sk); 238 239 /* Check if socket is already active */ 240 rc = -EINVAL; 241 if (sk->sk_state != SMC_INIT) 242 goto out_rel; 243 244 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 245 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 246 247 out_rel: 248 release_sock(sk); 249 out: 250 return rc; 251 } 252 253 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 254 unsigned long mask) 255 { 256 /* options we don't get control via setsockopt for */ 257 nsk->sk_type = osk->sk_type; 258 nsk->sk_sndbuf = osk->sk_sndbuf; 259 nsk->sk_rcvbuf = osk->sk_rcvbuf; 260 nsk->sk_sndtimeo = osk->sk_sndtimeo; 261 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 262 nsk->sk_mark = osk->sk_mark; 263 nsk->sk_priority = osk->sk_priority; 264 nsk->sk_rcvlowat = osk->sk_rcvlowat; 265 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 266 nsk->sk_err = osk->sk_err; 267 268 nsk->sk_flags &= ~mask; 269 nsk->sk_flags |= osk->sk_flags & mask; 270 } 271 272 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 273 (1UL << SOCK_KEEPOPEN) | \ 274 (1UL << SOCK_LINGER) | \ 275 (1UL << SOCK_BROADCAST) | \ 276 (1UL << SOCK_TIMESTAMP) | \ 277 (1UL << SOCK_DBG) | \ 278 (1UL << SOCK_RCVTSTAMP) | \ 279 (1UL << SOCK_RCVTSTAMPNS) | \ 280 (1UL << SOCK_LOCALROUTE) | \ 281 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 282 (1UL << SOCK_RXQ_OVFL) | \ 283 (1UL << SOCK_WIFI_STATUS) | \ 284 (1UL << SOCK_NOFCS) | \ 285 (1UL << SOCK_FILTER_LOCKED)) 286 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 287 * clc socket (since smc is not called for these options from net/core) 288 */ 289 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 290 { 291 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 292 } 293 294 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 295 (1UL << SOCK_KEEPOPEN) | \ 296 (1UL << SOCK_LINGER) | \ 297 (1UL << SOCK_DBG)) 298 /* copy only settings and flags relevant for smc from clc to smc socket */ 299 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 300 { 301 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 302 } 303 304 /* register a new rmb, optionally send confirm_rkey msg to register with peer */ 305 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc, 306 bool conf_rkey) 307 { 308 /* register memory region for new rmb */ 309 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { 310 rmb_desc->regerr = 1; 311 return -EFAULT; 312 } 313 if (!conf_rkey) 314 return 0; 315 /* exchange confirm_rkey msg with peer */ 316 if (smc_llc_do_confirm_rkey(link, rmb_desc)) { 317 rmb_desc->regerr = 1; 318 return -EFAULT; 319 } 320 return 0; 321 } 322 323 static int smc_clnt_conf_first_link(struct smc_sock *smc) 324 { 325 struct net *net = sock_net(smc->clcsock->sk); 326 struct smc_link_group *lgr = smc->conn.lgr; 327 struct smc_link *link; 328 int rest; 329 int rc; 330 331 link = &lgr->lnk[SMC_SINGLE_LINK]; 332 /* receive CONFIRM LINK request from server over RoCE fabric */ 333 rest = wait_for_completion_interruptible_timeout( 334 &link->llc_confirm, 335 SMC_LLC_WAIT_FIRST_TIME); 336 if (rest <= 0) { 337 struct smc_clc_msg_decline dclc; 338 339 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 340 SMC_CLC_DECLINE); 341 return rc; 342 } 343 344 if (link->llc_confirm_rc) 345 return SMC_CLC_DECL_RMBE_EC; 346 347 rc = smc_ib_modify_qp_rts(link); 348 if (rc) 349 return SMC_CLC_DECL_ERR_RDYLNK; 350 351 smc_wr_remember_qp_attr(link); 352 353 if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) 354 return SMC_CLC_DECL_ERR_REGRMB; 355 356 /* send CONFIRM LINK response over RoCE fabric */ 357 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 358 if (rc < 0) 359 return SMC_CLC_DECL_TIMEOUT_CL; 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->gid, SMC_LLC_RESP); 376 if (rc < 0) 377 return SMC_CLC_DECL_TIMEOUT_AL; 378 379 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); 380 381 return 0; 382 } 383 384 static void smcr_conn_save_peer_info(struct smc_sock *smc, 385 struct smc_clc_msg_accept_confirm *clc) 386 { 387 int bufsize = smc_uncompress_bufsize(clc->rmbe_size); 388 389 smc->conn.peer_rmbe_idx = clc->rmbe_idx; 390 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token); 391 smc->conn.peer_rmbe_size = bufsize; 392 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 393 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 394 } 395 396 static void smcd_conn_save_peer_info(struct smc_sock *smc, 397 struct smc_clc_msg_accept_confirm *clc) 398 { 399 int bufsize = smc_uncompress_bufsize(clc->dmbe_size); 400 401 smc->conn.peer_rmbe_idx = clc->dmbe_idx; 402 smc->conn.peer_token = clc->token; 403 /* msg header takes up space in the buffer */ 404 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 405 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 406 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 407 } 408 409 static void smc_conn_save_peer_info(struct smc_sock *smc, 410 struct smc_clc_msg_accept_confirm *clc) 411 { 412 if (smc->conn.lgr->is_smcd) 413 smcd_conn_save_peer_info(smc, clc); 414 else 415 smcr_conn_save_peer_info(smc, clc); 416 } 417 418 static void smc_link_save_peer_info(struct smc_link *link, 419 struct smc_clc_msg_accept_confirm *clc) 420 { 421 link->peer_qpn = ntoh24(clc->qpn); 422 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); 423 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); 424 link->peer_psn = ntoh24(clc->psn); 425 link->peer_mtu = clc->qp_mtu; 426 } 427 428 /* fall back during connect */ 429 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 430 { 431 smc->use_fallback = true; 432 smc->fallback_rsn = reason_code; 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 if (smc->sk.sk_state == SMC_INIT) 446 sock_put(&smc->sk); /* passive closing */ 447 return reason_code; 448 } 449 if (reason_code != SMC_CLC_DECL_PEERDECL) { 450 rc = smc_clc_send_decline(smc, reason_code); 451 if (rc < 0) { 452 if (smc->sk.sk_state == SMC_INIT) 453 sock_put(&smc->sk); /* passive closing */ 454 return rc; 455 } 456 } 457 return smc_connect_fallback(smc, reason_code); 458 } 459 460 /* abort connecting */ 461 static int smc_connect_abort(struct smc_sock *smc, int reason_code, 462 int local_contact) 463 { 464 if (local_contact == SMC_FIRST_CONTACT) 465 smc_lgr_forget(smc->conn.lgr); 466 mutex_unlock(&smc_create_lgr_pending); 467 smc_conn_free(&smc->conn); 468 return reason_code; 469 } 470 471 /* check if there is a rdma device available for this connection. */ 472 /* called for connect and listen */ 473 static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev, 474 u8 *ibport, unsigned short vlan_id, u8 gid[]) 475 { 476 int reason_code = 0; 477 478 /* PNET table look up: search active ib_device and port 479 * within same PNETID that also contains the ethernet device 480 * used for the internal TCP socket 481 */ 482 smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport, vlan_id, 483 gid); 484 if (!(*ibdev)) 485 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ 486 487 return reason_code; 488 } 489 490 /* check if there is an ISM device available for this connection. */ 491 /* called for connect and listen */ 492 static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev) 493 { 494 /* Find ISM device with same PNETID as connecting interface */ 495 smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev); 496 if (!(*ismdev)) 497 return SMC_CLC_DECL_CNFERR; /* configuration error */ 498 return 0; 499 } 500 501 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 502 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 503 struct smcd_dev *ismdev, 504 unsigned short vlan_id) 505 { 506 if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id)) 507 return SMC_CLC_DECL_CNFERR; 508 return 0; 509 } 510 511 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 512 * used, the VLAN ID will be registered again during the connection setup. 513 */ 514 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd, 515 struct smcd_dev *ismdev, 516 unsigned short vlan_id) 517 { 518 if (!is_smcd) 519 return 0; 520 if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id)) 521 return SMC_CLC_DECL_CNFERR; 522 return 0; 523 } 524 525 /* CLC handshake during connect */ 526 static int smc_connect_clc(struct smc_sock *smc, int smc_type, 527 struct smc_clc_msg_accept_confirm *aclc, 528 struct smc_ib_device *ibdev, u8 ibport, 529 u8 gid[], struct smcd_dev *ismdev) 530 { 531 int rc = 0; 532 533 /* do inband token exchange */ 534 rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, gid, ismdev); 535 if (rc) 536 return rc; 537 /* receive SMC Accept CLC message */ 538 return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT); 539 } 540 541 /* setup for RDMA connection of client */ 542 static int smc_connect_rdma(struct smc_sock *smc, 543 struct smc_clc_msg_accept_confirm *aclc, 544 struct smc_ib_device *ibdev, u8 ibport) 545 { 546 int local_contact = SMC_FIRST_CONTACT; 547 struct smc_link *link; 548 int reason_code = 0; 549 550 mutex_lock(&smc_create_lgr_pending); 551 local_contact = smc_conn_create(smc, false, aclc->hdr.flag, ibdev, 552 ibport, ntoh24(aclc->qpn), &aclc->lcl, 553 NULL, 0); 554 if (local_contact < 0) { 555 if (local_contact == -ENOMEM) 556 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ 557 else if (local_contact == -ENOLINK) 558 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ 559 else 560 reason_code = SMC_CLC_DECL_INTERR; /* other error */ 561 return smc_connect_abort(smc, reason_code, 0); 562 } 563 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 564 565 smc_conn_save_peer_info(smc, aclc); 566 567 /* create send buffer and rmb */ 568 if (smc_buf_create(smc, false)) 569 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); 570 571 if (local_contact == SMC_FIRST_CONTACT) 572 smc_link_save_peer_info(link, aclc); 573 574 if (smc_rmb_rtoken_handling(&smc->conn, aclc)) 575 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK, 576 local_contact); 577 578 smc_close_init(smc); 579 smc_rx_init(smc); 580 581 if (local_contact == SMC_FIRST_CONTACT) { 582 if (smc_ib_ready_link(link)) 583 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK, 584 local_contact); 585 } else { 586 if (!smc->conn.rmb_desc->reused && 587 smc_reg_rmb(link, smc->conn.rmb_desc, true)) 588 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB, 589 local_contact); 590 } 591 smc_rmb_sync_sg_for_device(&smc->conn); 592 593 reason_code = smc_clc_send_confirm(smc); 594 if (reason_code) 595 return smc_connect_abort(smc, reason_code, local_contact); 596 597 smc_tx_init(smc); 598 599 if (local_contact == SMC_FIRST_CONTACT) { 600 /* QP confirmation over RoCE fabric */ 601 reason_code = smc_clnt_conf_first_link(smc); 602 if (reason_code) 603 return smc_connect_abort(smc, reason_code, 604 local_contact); 605 } 606 mutex_unlock(&smc_create_lgr_pending); 607 608 smc_copy_sock_settings_to_clc(smc); 609 if (smc->sk.sk_state == SMC_INIT) 610 smc->sk.sk_state = SMC_ACTIVE; 611 612 return 0; 613 } 614 615 /* setup for ISM connection of client */ 616 static int smc_connect_ism(struct smc_sock *smc, 617 struct smc_clc_msg_accept_confirm *aclc, 618 struct smcd_dev *ismdev) 619 { 620 int local_contact = SMC_FIRST_CONTACT; 621 int rc = 0; 622 623 mutex_lock(&smc_create_lgr_pending); 624 local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0, 0, 625 NULL, ismdev, aclc->gid); 626 if (local_contact < 0) 627 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 0); 628 629 /* Create send and receive buffers */ 630 if (smc_buf_create(smc, true)) 631 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); 632 633 smc_conn_save_peer_info(smc, aclc); 634 smc_close_init(smc); 635 smc_rx_init(smc); 636 smc_tx_init(smc); 637 638 rc = smc_clc_send_confirm(smc); 639 if (rc) 640 return smc_connect_abort(smc, rc, local_contact); 641 mutex_unlock(&smc_create_lgr_pending); 642 643 smc_copy_sock_settings_to_clc(smc); 644 if (smc->sk.sk_state == SMC_INIT) 645 smc->sk.sk_state = SMC_ACTIVE; 646 647 return 0; 648 } 649 650 /* perform steps before actually connecting */ 651 static int __smc_connect(struct smc_sock *smc) 652 { 653 bool ism_supported = false, rdma_supported = false; 654 struct smc_clc_msg_accept_confirm aclc; 655 struct smc_ib_device *ibdev; 656 struct smcd_dev *ismdev; 657 u8 gid[SMC_GID_SIZE]; 658 unsigned short vlan; 659 int smc_type; 660 int rc = 0; 661 u8 ibport; 662 663 sock_hold(&smc->sk); /* sock put in passive closing */ 664 665 if (smc->use_fallback) 666 return smc_connect_fallback(smc, smc->fallback_rsn); 667 668 /* if peer has not signalled SMC-capability, fall back */ 669 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 670 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 671 672 /* IPSec connections opt out of SMC-R optimizations */ 673 if (using_ipsec(smc)) 674 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC); 675 676 /* check for VLAN ID */ 677 if (smc_vlan_by_tcpsk(smc->clcsock, &vlan)) 678 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR); 679 680 /* check if there is an ism device available */ 681 if (!smc_check_ism(smc, &ismdev) && 682 !smc_connect_ism_vlan_setup(smc, ismdev, vlan)) { 683 /* ISM is supported for this connection */ 684 ism_supported = true; 685 smc_type = SMC_TYPE_D; 686 } 687 688 /* check if there is a rdma device available */ 689 if (!smc_check_rdma(smc, &ibdev, &ibport, vlan, gid)) { 690 /* RDMA is supported for this connection */ 691 rdma_supported = true; 692 if (ism_supported) 693 smc_type = SMC_TYPE_B; /* both */ 694 else 695 smc_type = SMC_TYPE_R; /* only RDMA */ 696 } 697 698 /* if neither ISM nor RDMA are supported, fallback */ 699 if (!rdma_supported && !ism_supported) 700 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV); 701 702 /* perform CLC handshake */ 703 rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, gid, ismdev); 704 if (rc) { 705 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); 706 return smc_connect_decline_fallback(smc, rc); 707 } 708 709 /* depending on previous steps, connect using rdma or ism */ 710 if (rdma_supported && aclc.hdr.path == SMC_TYPE_R) 711 rc = smc_connect_rdma(smc, &aclc, ibdev, ibport); 712 else if (ism_supported && aclc.hdr.path == SMC_TYPE_D) 713 rc = smc_connect_ism(smc, &aclc, ismdev); 714 else 715 rc = SMC_CLC_DECL_MODEUNSUPP; 716 if (rc) { 717 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); 718 return smc_connect_decline_fallback(smc, rc); 719 } 720 721 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); 722 return 0; 723 } 724 725 static void smc_connect_work(struct work_struct *work) 726 { 727 struct smc_sock *smc = container_of(work, struct smc_sock, 728 connect_work); 729 int rc; 730 731 lock_sock(&smc->sk); 732 rc = kernel_connect(smc->clcsock, &smc->connect_info->addr, 733 smc->connect_info->alen, smc->connect_info->flags); 734 if (smc->clcsock->sk->sk_err) { 735 smc->sk.sk_err = smc->clcsock->sk->sk_err; 736 goto out; 737 } 738 if (rc < 0) { 739 smc->sk.sk_err = -rc; 740 goto out; 741 } 742 743 rc = __smc_connect(smc); 744 if (rc < 0) 745 smc->sk.sk_err = -rc; 746 747 out: 748 if (smc->sk.sk_err) 749 smc->sk.sk_state_change(&smc->sk); 750 else 751 smc->sk.sk_write_space(&smc->sk); 752 kfree(smc->connect_info); 753 smc->connect_info = NULL; 754 release_sock(&smc->sk); 755 } 756 757 static int smc_connect(struct socket *sock, struct sockaddr *addr, 758 int alen, int flags) 759 { 760 struct sock *sk = sock->sk; 761 struct smc_sock *smc; 762 int rc = -EINVAL; 763 764 smc = smc_sk(sk); 765 766 /* separate smc parameter checking to be safe */ 767 if (alen < sizeof(addr->sa_family)) 768 goto out_err; 769 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 770 goto out_err; 771 772 lock_sock(sk); 773 switch (sk->sk_state) { 774 default: 775 goto out; 776 case SMC_ACTIVE: 777 rc = -EISCONN; 778 goto out; 779 case SMC_INIT: 780 rc = 0; 781 break; 782 } 783 784 smc_copy_sock_settings_to_clc(smc); 785 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 786 if (flags & O_NONBLOCK) { 787 if (smc->connect_info) { 788 rc = -EALREADY; 789 goto out; 790 } 791 smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL); 792 if (!smc->connect_info) { 793 rc = -ENOMEM; 794 goto out; 795 } 796 smc->connect_info->alen = alen; 797 smc->connect_info->flags = flags ^ O_NONBLOCK; 798 memcpy(&smc->connect_info->addr, addr, alen); 799 schedule_work(&smc->connect_work); 800 rc = -EINPROGRESS; 801 } else { 802 rc = kernel_connect(smc->clcsock, addr, alen, flags); 803 if (rc) 804 goto out; 805 806 rc = __smc_connect(smc); 807 if (rc < 0) 808 goto out; 809 else 810 rc = 0; /* success cases including fallback */ 811 } 812 813 out: 814 release_sock(sk); 815 out_err: 816 return rc; 817 } 818 819 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 820 { 821 struct socket *new_clcsock = NULL; 822 struct sock *lsk = &lsmc->sk; 823 struct sock *new_sk; 824 int rc; 825 826 release_sock(lsk); 827 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 828 if (!new_sk) { 829 rc = -ENOMEM; 830 lsk->sk_err = ENOMEM; 831 *new_smc = NULL; 832 lock_sock(lsk); 833 goto out; 834 } 835 *new_smc = smc_sk(new_sk); 836 837 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); 838 lock_sock(lsk); 839 if (rc < 0) 840 lsk->sk_err = -rc; 841 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 842 if (new_clcsock) 843 sock_release(new_clcsock); 844 new_sk->sk_state = SMC_CLOSED; 845 sock_set_flag(new_sk, SOCK_DEAD); 846 new_sk->sk_prot->unhash(new_sk); 847 sock_put(new_sk); /* final */ 848 *new_smc = NULL; 849 goto out; 850 } 851 852 (*new_smc)->clcsock = new_clcsock; 853 out: 854 return rc; 855 } 856 857 /* add a just created sock to the accept queue of the listen sock as 858 * candidate for a following socket accept call from user space 859 */ 860 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 861 { 862 struct smc_sock *par = smc_sk(parent); 863 864 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 865 spin_lock(&par->accept_q_lock); 866 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 867 spin_unlock(&par->accept_q_lock); 868 sk_acceptq_added(parent); 869 } 870 871 /* remove a socket from the accept queue of its parental listening socket */ 872 static void smc_accept_unlink(struct sock *sk) 873 { 874 struct smc_sock *par = smc_sk(sk)->listen_smc; 875 876 spin_lock(&par->accept_q_lock); 877 list_del_init(&smc_sk(sk)->accept_q); 878 spin_unlock(&par->accept_q_lock); 879 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 880 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 881 } 882 883 /* remove a sock from the accept queue to bind it to a new socket created 884 * for a socket accept call from user space 885 */ 886 struct sock *smc_accept_dequeue(struct sock *parent, 887 struct socket *new_sock) 888 { 889 struct smc_sock *isk, *n; 890 struct sock *new_sk; 891 892 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 893 new_sk = (struct sock *)isk; 894 895 smc_accept_unlink(new_sk); 896 if (new_sk->sk_state == SMC_CLOSED) { 897 if (isk->clcsock) { 898 sock_release(isk->clcsock); 899 isk->clcsock = NULL; 900 } 901 new_sk->sk_prot->unhash(new_sk); 902 sock_put(new_sk); /* final */ 903 continue; 904 } 905 if (new_sock) 906 sock_graft(new_sk, new_sock); 907 return new_sk; 908 } 909 return NULL; 910 } 911 912 /* clean up for a created but never accepted sock */ 913 void smc_close_non_accepted(struct sock *sk) 914 { 915 struct smc_sock *smc = smc_sk(sk); 916 917 lock_sock(sk); 918 if (!sk->sk_lingertime) 919 /* wait for peer closing */ 920 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 921 if (!smc->use_fallback) { 922 smc_close_active(smc); 923 sock_set_flag(sk, SOCK_DEAD); 924 sk->sk_shutdown |= SHUTDOWN_MASK; 925 } 926 if (smc->clcsock) { 927 struct socket *tcp; 928 929 tcp = smc->clcsock; 930 smc->clcsock = NULL; 931 sock_release(tcp); 932 } 933 if (smc->use_fallback) { 934 sock_put(sk); /* passive closing */ 935 sk->sk_state = SMC_CLOSED; 936 } else { 937 if (sk->sk_state == SMC_CLOSED) 938 smc_conn_free(&smc->conn); 939 } 940 release_sock(sk); 941 sk->sk_prot->unhash(sk); 942 sock_put(sk); /* final sock_put */ 943 } 944 945 static int smc_serv_conf_first_link(struct smc_sock *smc) 946 { 947 struct net *net = sock_net(smc->clcsock->sk); 948 struct smc_link_group *lgr = smc->conn.lgr; 949 struct smc_link *link; 950 int rest; 951 int rc; 952 953 link = &lgr->lnk[SMC_SINGLE_LINK]; 954 955 if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) 956 return SMC_CLC_DECL_ERR_REGRMB; 957 958 /* send CONFIRM LINK request to client over the RoCE fabric */ 959 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 960 if (rc < 0) 961 return SMC_CLC_DECL_TIMEOUT_CL; 962 963 /* receive CONFIRM LINK response from client over the RoCE fabric */ 964 rest = wait_for_completion_interruptible_timeout( 965 &link->llc_confirm_resp, 966 SMC_LLC_WAIT_FIRST_TIME); 967 if (rest <= 0) { 968 struct smc_clc_msg_decline dclc; 969 970 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 971 SMC_CLC_DECLINE); 972 return rc; 973 } 974 975 if (link->llc_confirm_resp_rc) 976 return SMC_CLC_DECL_RMBE_EC; 977 978 /* send ADD LINK request to client over the RoCE fabric */ 979 rc = smc_llc_send_add_link(link, 980 link->smcibdev->mac[link->ibport - 1], 981 link->gid, SMC_LLC_REQ); 982 if (rc < 0) 983 return SMC_CLC_DECL_TIMEOUT_AL; 984 985 /* receive ADD LINK response from client over the RoCE fabric */ 986 rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp, 987 SMC_LLC_WAIT_TIME); 988 if (rest <= 0) { 989 struct smc_clc_msg_decline dclc; 990 991 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 992 SMC_CLC_DECLINE); 993 return rc; 994 } 995 996 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); 997 998 return 0; 999 } 1000 1001 /* listen worker: finish */ 1002 static void smc_listen_out(struct smc_sock *new_smc) 1003 { 1004 struct smc_sock *lsmc = new_smc->listen_smc; 1005 struct sock *newsmcsk = &new_smc->sk; 1006 1007 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1008 if (lsmc->sk.sk_state == SMC_LISTEN) { 1009 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1010 } else { /* no longer listening */ 1011 smc_close_non_accepted(newsmcsk); 1012 } 1013 release_sock(&lsmc->sk); 1014 1015 /* Wake up accept */ 1016 lsmc->sk.sk_data_ready(&lsmc->sk); 1017 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1018 } 1019 1020 /* listen worker: finish in state connected */ 1021 static void smc_listen_out_connected(struct smc_sock *new_smc) 1022 { 1023 struct sock *newsmcsk = &new_smc->sk; 1024 1025 sk_refcnt_debug_inc(newsmcsk); 1026 if (newsmcsk->sk_state == SMC_INIT) 1027 newsmcsk->sk_state = SMC_ACTIVE; 1028 1029 smc_listen_out(new_smc); 1030 } 1031 1032 /* listen worker: finish in error state */ 1033 static void smc_listen_out_err(struct smc_sock *new_smc) 1034 { 1035 struct sock *newsmcsk = &new_smc->sk; 1036 1037 if (newsmcsk->sk_state == SMC_INIT) 1038 sock_put(&new_smc->sk); /* passive closing */ 1039 newsmcsk->sk_state = SMC_CLOSED; 1040 smc_conn_free(&new_smc->conn); 1041 1042 smc_listen_out(new_smc); 1043 } 1044 1045 /* listen worker: decline and fall back if possible */ 1046 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1047 int local_contact) 1048 { 1049 /* RDMA setup failed, switch back to TCP */ 1050 if (local_contact == SMC_FIRST_CONTACT) 1051 smc_lgr_forget(new_smc->conn.lgr); 1052 if (reason_code < 0) { /* error, no fallback possible */ 1053 smc_listen_out_err(new_smc); 1054 return; 1055 } 1056 smc_conn_free(&new_smc->conn); 1057 new_smc->use_fallback = true; 1058 new_smc->fallback_rsn = reason_code; 1059 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1060 if (smc_clc_send_decline(new_smc, reason_code) < 0) { 1061 smc_listen_out_err(new_smc); 1062 return; 1063 } 1064 } 1065 smc_listen_out_connected(new_smc); 1066 } 1067 1068 /* listen worker: check prefixes */ 1069 static int smc_listen_rdma_check(struct smc_sock *new_smc, 1070 struct smc_clc_msg_proposal *pclc) 1071 { 1072 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1073 struct socket *newclcsock = new_smc->clcsock; 1074 1075 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1076 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1077 return SMC_CLC_DECL_CNFERR; 1078 1079 return 0; 1080 } 1081 1082 /* listen worker: initialize connection and buffers */ 1083 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1084 struct smc_clc_msg_proposal *pclc, 1085 struct smc_ib_device *ibdev, u8 ibport, 1086 int *local_contact) 1087 { 1088 /* allocate connection / link group */ 1089 *local_contact = smc_conn_create(new_smc, false, 0, ibdev, ibport, 0, 1090 &pclc->lcl, NULL, 0); 1091 if (*local_contact < 0) { 1092 if (*local_contact == -ENOMEM) 1093 return SMC_CLC_DECL_MEM;/* insufficient memory*/ 1094 return SMC_CLC_DECL_INTERR; /* other error */ 1095 } 1096 1097 /* create send buffer and rmb */ 1098 if (smc_buf_create(new_smc, false)) 1099 return SMC_CLC_DECL_MEM; 1100 1101 return 0; 1102 } 1103 1104 /* listen worker: initialize connection and buffers for SMC-D */ 1105 static int smc_listen_ism_init(struct smc_sock *new_smc, 1106 struct smc_clc_msg_proposal *pclc, 1107 struct smcd_dev *ismdev, 1108 int *local_contact) 1109 { 1110 struct smc_clc_msg_smcd *pclc_smcd; 1111 1112 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1113 *local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, 0, NULL, 1114 ismdev, pclc_smcd->gid); 1115 if (*local_contact < 0) { 1116 if (*local_contact == -ENOMEM) 1117 return SMC_CLC_DECL_MEM;/* insufficient memory*/ 1118 return SMC_CLC_DECL_INTERR; /* other error */ 1119 } 1120 1121 /* Check if peer can be reached via ISM device */ 1122 if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid, 1123 new_smc->conn.lgr->vlan_id, 1124 new_smc->conn.lgr->smcd)) { 1125 if (*local_contact == SMC_FIRST_CONTACT) 1126 smc_lgr_forget(new_smc->conn.lgr); 1127 smc_conn_free(&new_smc->conn); 1128 return SMC_CLC_DECL_CNFERR; 1129 } 1130 1131 /* Create send and receive buffers */ 1132 if (smc_buf_create(new_smc, true)) { 1133 if (*local_contact == SMC_FIRST_CONTACT) 1134 smc_lgr_forget(new_smc->conn.lgr); 1135 smc_conn_free(&new_smc->conn); 1136 return SMC_CLC_DECL_MEM; 1137 } 1138 1139 return 0; 1140 } 1141 1142 /* listen worker: register buffers */ 1143 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact) 1144 { 1145 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 1146 1147 if (local_contact != SMC_FIRST_CONTACT) { 1148 if (!new_smc->conn.rmb_desc->reused) { 1149 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) 1150 return SMC_CLC_DECL_ERR_REGRMB; 1151 } 1152 } 1153 smc_rmb_sync_sg_for_device(&new_smc->conn); 1154 1155 return 0; 1156 } 1157 1158 /* listen worker: finish RDMA setup */ 1159 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 1160 struct smc_clc_msg_accept_confirm *cclc, 1161 int local_contact) 1162 { 1163 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 1164 int reason_code = 0; 1165 1166 if (local_contact == SMC_FIRST_CONTACT) 1167 smc_link_save_peer_info(link, cclc); 1168 1169 if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) { 1170 reason_code = SMC_CLC_DECL_ERR_RTOK; 1171 goto decline; 1172 } 1173 1174 if (local_contact == SMC_FIRST_CONTACT) { 1175 if (smc_ib_ready_link(link)) { 1176 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1177 goto decline; 1178 } 1179 /* QP confirmation over RoCE fabric */ 1180 reason_code = smc_serv_conf_first_link(new_smc); 1181 if (reason_code) 1182 goto decline; 1183 } 1184 return 0; 1185 1186 decline: 1187 mutex_unlock(&smc_create_lgr_pending); 1188 smc_listen_decline(new_smc, reason_code, local_contact); 1189 return reason_code; 1190 } 1191 1192 /* setup for RDMA connection of server */ 1193 static void smc_listen_work(struct work_struct *work) 1194 { 1195 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1196 smc_listen_work); 1197 struct socket *newclcsock = new_smc->clcsock; 1198 struct smc_clc_msg_accept_confirm cclc; 1199 struct smc_clc_msg_proposal *pclc; 1200 struct smc_ib_device *ibdev; 1201 bool ism_supported = false; 1202 struct smcd_dev *ismdev; 1203 u8 buf[SMC_CLC_MAX_LEN]; 1204 int local_contact = 0; 1205 unsigned short vlan; 1206 int reason_code = 0; 1207 int rc = 0; 1208 u8 ibport; 1209 1210 if (new_smc->use_fallback) { 1211 smc_listen_out_connected(new_smc); 1212 return; 1213 } 1214 1215 /* check if peer is smc capable */ 1216 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1217 new_smc->use_fallback = true; 1218 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; 1219 smc_listen_out_connected(new_smc); 1220 return; 1221 } 1222 1223 /* do inband token exchange - 1224 * wait for and receive SMC Proposal CLC message 1225 */ 1226 pclc = (struct smc_clc_msg_proposal *)&buf; 1227 reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN, 1228 SMC_CLC_PROPOSAL); 1229 if (reason_code) { 1230 smc_listen_decline(new_smc, reason_code, 0); 1231 return; 1232 } 1233 1234 /* IPSec connections opt out of SMC-R optimizations */ 1235 if (using_ipsec(new_smc)) { 1236 smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0); 1237 return; 1238 } 1239 1240 mutex_lock(&smc_create_lgr_pending); 1241 smc_close_init(new_smc); 1242 smc_rx_init(new_smc); 1243 smc_tx_init(new_smc); 1244 1245 /* check if ISM is available */ 1246 if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) && 1247 !smc_check_ism(new_smc, &ismdev) && 1248 !smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) { 1249 ism_supported = true; 1250 } 1251 1252 /* check if RDMA is available */ 1253 if (!ism_supported && 1254 ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) || 1255 smc_vlan_by_tcpsk(new_smc->clcsock, &vlan) || 1256 smc_check_rdma(new_smc, &ibdev, &ibport, vlan, NULL) || 1257 smc_listen_rdma_check(new_smc, pclc) || 1258 smc_listen_rdma_init(new_smc, pclc, ibdev, ibport, 1259 &local_contact) || 1260 smc_listen_rdma_reg(new_smc, local_contact))) { 1261 /* SMC not supported, decline */ 1262 mutex_unlock(&smc_create_lgr_pending); 1263 smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP, 1264 local_contact); 1265 return; 1266 } 1267 1268 /* send SMC Accept CLC message */ 1269 rc = smc_clc_send_accept(new_smc, local_contact); 1270 if (rc) { 1271 mutex_unlock(&smc_create_lgr_pending); 1272 smc_listen_decline(new_smc, rc, local_contact); 1273 return; 1274 } 1275 1276 /* receive SMC Confirm CLC message */ 1277 reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), 1278 SMC_CLC_CONFIRM); 1279 if (reason_code) { 1280 mutex_unlock(&smc_create_lgr_pending); 1281 smc_listen_decline(new_smc, reason_code, local_contact); 1282 return; 1283 } 1284 1285 /* finish worker */ 1286 if (!ism_supported) { 1287 if (smc_listen_rdma_finish(new_smc, &cclc, local_contact)) 1288 return; 1289 } 1290 smc_conn_save_peer_info(new_smc, &cclc); 1291 mutex_unlock(&smc_create_lgr_pending); 1292 smc_listen_out_connected(new_smc); 1293 } 1294 1295 static void smc_tcp_listen_work(struct work_struct *work) 1296 { 1297 struct smc_sock *lsmc = container_of(work, struct smc_sock, 1298 tcp_listen_work); 1299 struct sock *lsk = &lsmc->sk; 1300 struct smc_sock *new_smc; 1301 int rc = 0; 1302 1303 lock_sock(lsk); 1304 while (lsk->sk_state == SMC_LISTEN) { 1305 rc = smc_clcsock_accept(lsmc, &new_smc); 1306 if (rc) 1307 goto out; 1308 if (!new_smc) 1309 continue; 1310 1311 new_smc->listen_smc = lsmc; 1312 new_smc->use_fallback = lsmc->use_fallback; 1313 new_smc->fallback_rsn = lsmc->fallback_rsn; 1314 sock_hold(lsk); /* sock_put in smc_listen_work */ 1315 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 1316 smc_copy_sock_settings_to_smc(new_smc); 1317 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 1318 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 1319 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 1320 if (!schedule_work(&new_smc->smc_listen_work)) 1321 sock_put(&new_smc->sk); 1322 } 1323 1324 out: 1325 release_sock(lsk); 1326 sock_put(&lsmc->sk); /* sock_hold in smc_listen */ 1327 } 1328 1329 static int smc_listen(struct socket *sock, int backlog) 1330 { 1331 struct sock *sk = sock->sk; 1332 struct smc_sock *smc; 1333 int rc; 1334 1335 smc = smc_sk(sk); 1336 lock_sock(sk); 1337 1338 rc = -EINVAL; 1339 if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) 1340 goto out; 1341 1342 rc = 0; 1343 if (sk->sk_state == SMC_LISTEN) { 1344 sk->sk_max_ack_backlog = backlog; 1345 goto out; 1346 } 1347 /* some socket options are handled in core, so we could not apply 1348 * them to the clc socket -- copy smc socket options to clc socket 1349 */ 1350 smc_copy_sock_settings_to_clc(smc); 1351 if (!smc->use_fallback) 1352 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1353 1354 rc = kernel_listen(smc->clcsock, backlog); 1355 if (rc) 1356 goto out; 1357 sk->sk_max_ack_backlog = backlog; 1358 sk->sk_ack_backlog = 0; 1359 sk->sk_state = SMC_LISTEN; 1360 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 1361 sock_hold(sk); /* sock_hold in tcp_listen_worker */ 1362 if (!schedule_work(&smc->tcp_listen_work)) 1363 sock_put(sk); 1364 1365 out: 1366 release_sock(sk); 1367 return rc; 1368 } 1369 1370 static int smc_accept(struct socket *sock, struct socket *new_sock, 1371 int flags, bool kern) 1372 { 1373 struct sock *sk = sock->sk, *nsk; 1374 DECLARE_WAITQUEUE(wait, current); 1375 struct smc_sock *lsmc; 1376 long timeo; 1377 int rc = 0; 1378 1379 lsmc = smc_sk(sk); 1380 sock_hold(sk); /* sock_put below */ 1381 lock_sock(sk); 1382 1383 if (lsmc->sk.sk_state != SMC_LISTEN) { 1384 rc = -EINVAL; 1385 release_sock(sk); 1386 goto out; 1387 } 1388 1389 /* Wait for an incoming connection */ 1390 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1391 add_wait_queue_exclusive(sk_sleep(sk), &wait); 1392 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 1393 set_current_state(TASK_INTERRUPTIBLE); 1394 if (!timeo) { 1395 rc = -EAGAIN; 1396 break; 1397 } 1398 release_sock(sk); 1399 timeo = schedule_timeout(timeo); 1400 /* wakeup by sk_data_ready in smc_listen_work() */ 1401 sched_annotate_sleep(); 1402 lock_sock(sk); 1403 if (signal_pending(current)) { 1404 rc = sock_intr_errno(timeo); 1405 break; 1406 } 1407 } 1408 set_current_state(TASK_RUNNING); 1409 remove_wait_queue(sk_sleep(sk), &wait); 1410 1411 if (!rc) 1412 rc = sock_error(nsk); 1413 release_sock(sk); 1414 if (rc) 1415 goto out; 1416 1417 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 1418 /* wait till data arrives on the socket */ 1419 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 1420 MSEC_PER_SEC); 1421 if (smc_sk(nsk)->use_fallback) { 1422 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 1423 1424 lock_sock(clcsk); 1425 if (skb_queue_empty(&clcsk->sk_receive_queue)) 1426 sk_wait_data(clcsk, &timeo, NULL); 1427 release_sock(clcsk); 1428 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 1429 lock_sock(nsk); 1430 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 1431 release_sock(nsk); 1432 } 1433 } 1434 1435 out: 1436 sock_put(sk); /* sock_hold above */ 1437 return rc; 1438 } 1439 1440 static int smc_getname(struct socket *sock, struct sockaddr *addr, 1441 int peer) 1442 { 1443 struct smc_sock *smc; 1444 1445 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 1446 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 1447 return -ENOTCONN; 1448 1449 smc = smc_sk(sock->sk); 1450 1451 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 1452 } 1453 1454 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1455 { 1456 struct sock *sk = sock->sk; 1457 struct smc_sock *smc; 1458 int rc = -EPIPE; 1459 1460 smc = smc_sk(sk); 1461 lock_sock(sk); 1462 if ((sk->sk_state != SMC_ACTIVE) && 1463 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1464 (sk->sk_state != SMC_INIT)) 1465 goto out; 1466 1467 if (msg->msg_flags & MSG_FASTOPEN) { 1468 if (sk->sk_state == SMC_INIT) { 1469 smc->use_fallback = true; 1470 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 1471 } else { 1472 rc = -EINVAL; 1473 goto out; 1474 } 1475 } 1476 1477 if (smc->use_fallback) 1478 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 1479 else 1480 rc = smc_tx_sendmsg(smc, msg, len); 1481 out: 1482 release_sock(sk); 1483 return rc; 1484 } 1485 1486 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 1487 int flags) 1488 { 1489 struct sock *sk = sock->sk; 1490 struct smc_sock *smc; 1491 int rc = -ENOTCONN; 1492 1493 smc = smc_sk(sk); 1494 lock_sock(sk); 1495 if ((sk->sk_state == SMC_INIT) || 1496 (sk->sk_state == SMC_LISTEN) || 1497 (sk->sk_state == SMC_CLOSED)) 1498 goto out; 1499 1500 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 1501 rc = 0; 1502 goto out; 1503 } 1504 1505 if (smc->use_fallback) { 1506 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 1507 } else { 1508 msg->msg_namelen = 0; 1509 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 1510 } 1511 1512 out: 1513 release_sock(sk); 1514 return rc; 1515 } 1516 1517 static __poll_t smc_accept_poll(struct sock *parent) 1518 { 1519 struct smc_sock *isk = smc_sk(parent); 1520 __poll_t mask = 0; 1521 1522 spin_lock(&isk->accept_q_lock); 1523 if (!list_empty(&isk->accept_q)) 1524 mask = EPOLLIN | EPOLLRDNORM; 1525 spin_unlock(&isk->accept_q_lock); 1526 1527 return mask; 1528 } 1529 1530 static __poll_t smc_poll(struct file *file, struct socket *sock, 1531 poll_table *wait) 1532 { 1533 struct sock *sk = sock->sk; 1534 __poll_t mask = 0; 1535 struct smc_sock *smc; 1536 1537 if (!sk) 1538 return EPOLLNVAL; 1539 1540 smc = smc_sk(sock->sk); 1541 if (smc->use_fallback) { 1542 /* delegate to CLC child sock */ 1543 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 1544 sk->sk_err = smc->clcsock->sk->sk_err; 1545 if (sk->sk_err) 1546 mask |= EPOLLERR; 1547 } else { 1548 if (sk->sk_state != SMC_CLOSED) 1549 sock_poll_wait(file, sock, wait); 1550 if (sk->sk_err) 1551 mask |= EPOLLERR; 1552 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 1553 (sk->sk_state == SMC_CLOSED)) 1554 mask |= EPOLLHUP; 1555 if (sk->sk_state == SMC_LISTEN) { 1556 /* woken up by sk_data_ready in smc_listen_work() */ 1557 mask = smc_accept_poll(sk); 1558 } else { 1559 if (atomic_read(&smc->conn.sndbuf_space) || 1560 sk->sk_shutdown & SEND_SHUTDOWN) { 1561 mask |= EPOLLOUT | EPOLLWRNORM; 1562 } else { 1563 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1564 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1565 } 1566 if (atomic_read(&smc->conn.bytes_to_rcv)) 1567 mask |= EPOLLIN | EPOLLRDNORM; 1568 if (sk->sk_shutdown & RCV_SHUTDOWN) 1569 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 1570 if (sk->sk_state == SMC_APPCLOSEWAIT1) 1571 mask |= EPOLLIN; 1572 if (smc->conn.urg_state == SMC_URG_VALID) 1573 mask |= EPOLLPRI; 1574 } 1575 } 1576 1577 return mask; 1578 } 1579 1580 static int smc_shutdown(struct socket *sock, int how) 1581 { 1582 struct sock *sk = sock->sk; 1583 struct smc_sock *smc; 1584 int rc = -EINVAL; 1585 int rc1 = 0; 1586 1587 smc = smc_sk(sk); 1588 1589 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 1590 return rc; 1591 1592 lock_sock(sk); 1593 1594 rc = -ENOTCONN; 1595 if ((sk->sk_state != SMC_ACTIVE) && 1596 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 1597 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 1598 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1599 (sk->sk_state != SMC_APPCLOSEWAIT2) && 1600 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 1601 goto out; 1602 if (smc->use_fallback) { 1603 rc = kernel_sock_shutdown(smc->clcsock, how); 1604 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 1605 if (sk->sk_shutdown == SHUTDOWN_MASK) 1606 sk->sk_state = SMC_CLOSED; 1607 goto out; 1608 } 1609 switch (how) { 1610 case SHUT_RDWR: /* shutdown in both directions */ 1611 rc = smc_close_active(smc); 1612 break; 1613 case SHUT_WR: 1614 rc = smc_close_shutdown_write(smc); 1615 break; 1616 case SHUT_RD: 1617 rc = 0; 1618 /* nothing more to do because peer is not involved */ 1619 break; 1620 } 1621 if (smc->clcsock) 1622 rc1 = kernel_sock_shutdown(smc->clcsock, how); 1623 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 1624 sk->sk_shutdown |= how + 1; 1625 1626 out: 1627 release_sock(sk); 1628 return rc ? rc : rc1; 1629 } 1630 1631 static int smc_setsockopt(struct socket *sock, int level, int optname, 1632 char __user *optval, unsigned int optlen) 1633 { 1634 struct sock *sk = sock->sk; 1635 struct smc_sock *smc; 1636 int val, rc; 1637 1638 smc = smc_sk(sk); 1639 1640 /* generic setsockopts reaching us here always apply to the 1641 * CLC socket 1642 */ 1643 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 1644 optval, optlen); 1645 if (smc->clcsock->sk->sk_err) { 1646 sk->sk_err = smc->clcsock->sk->sk_err; 1647 sk->sk_error_report(sk); 1648 } 1649 if (rc) 1650 return rc; 1651 1652 if (optlen < sizeof(int)) 1653 return -EINVAL; 1654 if (get_user(val, (int __user *)optval)) 1655 return -EFAULT; 1656 1657 lock_sock(sk); 1658 switch (optname) { 1659 case TCP_ULP: 1660 case TCP_FASTOPEN: 1661 case TCP_FASTOPEN_CONNECT: 1662 case TCP_FASTOPEN_KEY: 1663 case TCP_FASTOPEN_NO_COOKIE: 1664 /* option not supported by SMC */ 1665 if (sk->sk_state == SMC_INIT) { 1666 smc->use_fallback = true; 1667 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 1668 } else { 1669 if (!smc->use_fallback) 1670 rc = -EINVAL; 1671 } 1672 break; 1673 case TCP_NODELAY: 1674 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { 1675 if (val && !smc->use_fallback) 1676 mod_delayed_work(system_wq, &smc->conn.tx_work, 1677 0); 1678 } 1679 break; 1680 case TCP_CORK: 1681 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { 1682 if (!val && !smc->use_fallback) 1683 mod_delayed_work(system_wq, &smc->conn.tx_work, 1684 0); 1685 } 1686 break; 1687 case TCP_DEFER_ACCEPT: 1688 smc->sockopt_defer_accept = val; 1689 break; 1690 default: 1691 break; 1692 } 1693 release_sock(sk); 1694 1695 return rc; 1696 } 1697 1698 static int smc_getsockopt(struct socket *sock, int level, int optname, 1699 char __user *optval, int __user *optlen) 1700 { 1701 struct smc_sock *smc; 1702 1703 smc = smc_sk(sock->sk); 1704 /* socket options apply to the CLC socket */ 1705 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 1706 optval, optlen); 1707 } 1708 1709 static int smc_ioctl(struct socket *sock, unsigned int cmd, 1710 unsigned long arg) 1711 { 1712 union smc_host_cursor cons, urg; 1713 struct smc_connection *conn; 1714 struct smc_sock *smc; 1715 int answ; 1716 1717 smc = smc_sk(sock->sk); 1718 conn = &smc->conn; 1719 lock_sock(&smc->sk); 1720 if (smc->use_fallback) { 1721 if (!smc->clcsock) { 1722 release_sock(&smc->sk); 1723 return -EBADF; 1724 } 1725 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 1726 release_sock(&smc->sk); 1727 return answ; 1728 } 1729 switch (cmd) { 1730 case SIOCINQ: /* same as FIONREAD */ 1731 if (smc->sk.sk_state == SMC_LISTEN) { 1732 release_sock(&smc->sk); 1733 return -EINVAL; 1734 } 1735 if (smc->sk.sk_state == SMC_INIT || 1736 smc->sk.sk_state == SMC_CLOSED) 1737 answ = 0; 1738 else 1739 answ = atomic_read(&smc->conn.bytes_to_rcv); 1740 break; 1741 case SIOCOUTQ: 1742 /* output queue size (not send + not acked) */ 1743 if (smc->sk.sk_state == SMC_LISTEN) { 1744 release_sock(&smc->sk); 1745 return -EINVAL; 1746 } 1747 if (smc->sk.sk_state == SMC_INIT || 1748 smc->sk.sk_state == SMC_CLOSED) 1749 answ = 0; 1750 else 1751 answ = smc->conn.sndbuf_desc->len - 1752 atomic_read(&smc->conn.sndbuf_space); 1753 break; 1754 case SIOCOUTQNSD: 1755 /* output queue size (not send only) */ 1756 if (smc->sk.sk_state == SMC_LISTEN) { 1757 release_sock(&smc->sk); 1758 return -EINVAL; 1759 } 1760 if (smc->sk.sk_state == SMC_INIT || 1761 smc->sk.sk_state == SMC_CLOSED) 1762 answ = 0; 1763 else 1764 answ = smc_tx_prepared_sends(&smc->conn); 1765 break; 1766 case SIOCATMARK: 1767 if (smc->sk.sk_state == SMC_LISTEN) { 1768 release_sock(&smc->sk); 1769 return -EINVAL; 1770 } 1771 if (smc->sk.sk_state == SMC_INIT || 1772 smc->sk.sk_state == SMC_CLOSED) { 1773 answ = 0; 1774 } else { 1775 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 1776 smc_curs_copy(&urg, &conn->urg_curs, conn); 1777 answ = smc_curs_diff(conn->rmb_desc->len, 1778 &cons, &urg) == 1; 1779 } 1780 break; 1781 default: 1782 release_sock(&smc->sk); 1783 return -ENOIOCTLCMD; 1784 } 1785 release_sock(&smc->sk); 1786 1787 return put_user(answ, (int __user *)arg); 1788 } 1789 1790 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 1791 int offset, size_t size, int flags) 1792 { 1793 struct sock *sk = sock->sk; 1794 struct smc_sock *smc; 1795 int rc = -EPIPE; 1796 1797 smc = smc_sk(sk); 1798 lock_sock(sk); 1799 if (sk->sk_state != SMC_ACTIVE) { 1800 release_sock(sk); 1801 goto out; 1802 } 1803 release_sock(sk); 1804 if (smc->use_fallback) 1805 rc = kernel_sendpage(smc->clcsock, page, offset, 1806 size, flags); 1807 else 1808 rc = sock_no_sendpage(sock, page, offset, size, flags); 1809 1810 out: 1811 return rc; 1812 } 1813 1814 /* Map the affected portions of the rmbe into an spd, note the number of bytes 1815 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 1816 * updates till whenever a respective page has been fully processed. 1817 * Note that subsequent recv() calls have to wait till all splice() processing 1818 * completed. 1819 */ 1820 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 1821 struct pipe_inode_info *pipe, size_t len, 1822 unsigned int flags) 1823 { 1824 struct sock *sk = sock->sk; 1825 struct smc_sock *smc; 1826 int rc = -ENOTCONN; 1827 1828 smc = smc_sk(sk); 1829 lock_sock(sk); 1830 1831 if (sk->sk_state == SMC_INIT || 1832 sk->sk_state == SMC_LISTEN || 1833 sk->sk_state == SMC_CLOSED) 1834 goto out; 1835 1836 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 1837 rc = 0; 1838 goto out; 1839 } 1840 1841 if (smc->use_fallback) { 1842 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 1843 pipe, len, flags); 1844 } else { 1845 if (*ppos) { 1846 rc = -ESPIPE; 1847 goto out; 1848 } 1849 if (flags & SPLICE_F_NONBLOCK) 1850 flags = MSG_DONTWAIT; 1851 else 1852 flags = 0; 1853 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 1854 } 1855 out: 1856 release_sock(sk); 1857 1858 return rc; 1859 } 1860 1861 /* must look like tcp */ 1862 static const struct proto_ops smc_sock_ops = { 1863 .family = PF_SMC, 1864 .owner = THIS_MODULE, 1865 .release = smc_release, 1866 .bind = smc_bind, 1867 .connect = smc_connect, 1868 .socketpair = sock_no_socketpair, 1869 .accept = smc_accept, 1870 .getname = smc_getname, 1871 .poll = smc_poll, 1872 .ioctl = smc_ioctl, 1873 .listen = smc_listen, 1874 .shutdown = smc_shutdown, 1875 .setsockopt = smc_setsockopt, 1876 .getsockopt = smc_getsockopt, 1877 .sendmsg = smc_sendmsg, 1878 .recvmsg = smc_recvmsg, 1879 .mmap = sock_no_mmap, 1880 .sendpage = smc_sendpage, 1881 .splice_read = smc_splice_read, 1882 }; 1883 1884 static int smc_create(struct net *net, struct socket *sock, int protocol, 1885 int kern) 1886 { 1887 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 1888 struct smc_sock *smc; 1889 struct sock *sk; 1890 int rc; 1891 1892 rc = -ESOCKTNOSUPPORT; 1893 if (sock->type != SOCK_STREAM) 1894 goto out; 1895 1896 rc = -EPROTONOSUPPORT; 1897 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 1898 goto out; 1899 1900 rc = -ENOBUFS; 1901 sock->ops = &smc_sock_ops; 1902 sk = smc_sock_alloc(net, sock, protocol); 1903 if (!sk) 1904 goto out; 1905 1906 /* create internal TCP socket for CLC handshake and fallback */ 1907 smc = smc_sk(sk); 1908 smc->use_fallback = false; /* assume rdma capability first */ 1909 smc->fallback_rsn = 0; 1910 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 1911 &smc->clcsock); 1912 if (rc) { 1913 sk_common_release(sk); 1914 goto out; 1915 } 1916 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 1917 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 1918 1919 out: 1920 return rc; 1921 } 1922 1923 static const struct net_proto_family smc_sock_family_ops = { 1924 .family = PF_SMC, 1925 .owner = THIS_MODULE, 1926 .create = smc_create, 1927 }; 1928 1929 static int __init smc_init(void) 1930 { 1931 int rc; 1932 1933 rc = smc_pnet_init(); 1934 if (rc) 1935 return rc; 1936 1937 rc = smc_llc_init(); 1938 if (rc) { 1939 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 1940 goto out_pnet; 1941 } 1942 1943 rc = smc_cdc_init(); 1944 if (rc) { 1945 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 1946 goto out_pnet; 1947 } 1948 1949 rc = proto_register(&smc_proto, 1); 1950 if (rc) { 1951 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 1952 goto out_pnet; 1953 } 1954 1955 rc = proto_register(&smc_proto6, 1); 1956 if (rc) { 1957 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 1958 goto out_proto; 1959 } 1960 1961 rc = sock_register(&smc_sock_family_ops); 1962 if (rc) { 1963 pr_err("%s: sock_register fails with %d\n", __func__, rc); 1964 goto out_proto6; 1965 } 1966 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 1967 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 1968 1969 rc = smc_ib_register_client(); 1970 if (rc) { 1971 pr_err("%s: ib_register fails with %d\n", __func__, rc); 1972 goto out_sock; 1973 } 1974 1975 static_branch_enable(&tcp_have_smc); 1976 return 0; 1977 1978 out_sock: 1979 sock_unregister(PF_SMC); 1980 out_proto6: 1981 proto_unregister(&smc_proto6); 1982 out_proto: 1983 proto_unregister(&smc_proto); 1984 out_pnet: 1985 smc_pnet_exit(); 1986 return rc; 1987 } 1988 1989 static void __exit smc_exit(void) 1990 { 1991 smc_core_exit(); 1992 static_branch_disable(&tcp_have_smc); 1993 smc_ib_unregister_client(); 1994 sock_unregister(PF_SMC); 1995 proto_unregister(&smc_proto6); 1996 proto_unregister(&smc_proto); 1997 smc_pnet_exit(); 1998 } 1999 2000 module_init(smc_init); 2001 module_exit(smc_exit); 2002 2003 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 2004 MODULE_DESCRIPTION("smc socket address family"); 2005 MODULE_LICENSE("GPL"); 2006 MODULE_ALIAS_NETPROTO(PF_SMC); 2007