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 29 #include <net/sock.h> 30 #include <net/tcp.h> 31 #include <net/smc.h> 32 #include <asm/ioctls.h> 33 34 #include <net/net_namespace.h> 35 #include <net/netns/generic.h> 36 #include "smc_netns.h" 37 38 #include "smc.h" 39 #include "smc_clc.h" 40 #include "smc_llc.h" 41 #include "smc_cdc.h" 42 #include "smc_core.h" 43 #include "smc_ib.h" 44 #include "smc_ism.h" 45 #include "smc_pnet.h" 46 #include "smc_tx.h" 47 #include "smc_rx.h" 48 #include "smc_close.h" 49 50 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group 51 * creation on server 52 */ 53 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group 54 * creation on client 55 */ 56 57 static void smc_tcp_listen_work(struct work_struct *); 58 static void smc_connect_work(struct work_struct *); 59 60 static void smc_set_keepalive(struct sock *sk, int val) 61 { 62 struct smc_sock *smc = smc_sk(sk); 63 64 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 65 } 66 67 static struct smc_hashinfo smc_v4_hashinfo = { 68 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 69 }; 70 71 static struct smc_hashinfo smc_v6_hashinfo = { 72 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 73 }; 74 75 int smc_hash_sk(struct sock *sk) 76 { 77 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 78 struct hlist_head *head; 79 80 head = &h->ht; 81 82 write_lock_bh(&h->lock); 83 sk_add_node(sk, head); 84 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 85 write_unlock_bh(&h->lock); 86 87 return 0; 88 } 89 EXPORT_SYMBOL_GPL(smc_hash_sk); 90 91 void smc_unhash_sk(struct sock *sk) 92 { 93 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 94 95 write_lock_bh(&h->lock); 96 if (sk_del_node_init(sk)) 97 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 98 write_unlock_bh(&h->lock); 99 } 100 EXPORT_SYMBOL_GPL(smc_unhash_sk); 101 102 struct proto smc_proto = { 103 .name = "SMC", 104 .owner = THIS_MODULE, 105 .keepalive = smc_set_keepalive, 106 .hash = smc_hash_sk, 107 .unhash = smc_unhash_sk, 108 .obj_size = sizeof(struct smc_sock), 109 .h.smc_hash = &smc_v4_hashinfo, 110 .slab_flags = SLAB_TYPESAFE_BY_RCU, 111 }; 112 EXPORT_SYMBOL_GPL(smc_proto); 113 114 struct proto smc_proto6 = { 115 .name = "SMC6", 116 .owner = THIS_MODULE, 117 .keepalive = smc_set_keepalive, 118 .hash = smc_hash_sk, 119 .unhash = smc_unhash_sk, 120 .obj_size = sizeof(struct smc_sock), 121 .h.smc_hash = &smc_v6_hashinfo, 122 .slab_flags = SLAB_TYPESAFE_BY_RCU, 123 }; 124 EXPORT_SYMBOL_GPL(smc_proto6); 125 126 static void smc_restore_fallback_changes(struct smc_sock *smc) 127 { 128 smc->clcsock->file->private_data = smc->sk.sk_socket; 129 smc->clcsock->file = NULL; 130 } 131 132 static int __smc_release(struct smc_sock *smc) 133 { 134 struct sock *sk = &smc->sk; 135 int rc = 0; 136 137 if (!smc->use_fallback) { 138 rc = smc_close_active(smc); 139 sock_set_flag(sk, SOCK_DEAD); 140 sk->sk_shutdown |= SHUTDOWN_MASK; 141 } else { 142 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT) 143 sock_put(sk); /* passive closing */ 144 if (sk->sk_state == SMC_LISTEN) { 145 /* wake up clcsock accept */ 146 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); 147 } 148 sk->sk_state = SMC_CLOSED; 149 sk->sk_state_change(sk); 150 smc_restore_fallback_changes(smc); 151 } 152 153 sk->sk_prot->unhash(sk); 154 155 if (sk->sk_state == SMC_CLOSED) { 156 if (smc->clcsock) { 157 release_sock(sk); 158 smc_clcsock_release(smc); 159 lock_sock(sk); 160 } 161 if (!smc->use_fallback) 162 smc_conn_free(&smc->conn); 163 } 164 165 return rc; 166 } 167 168 static int smc_release(struct socket *sock) 169 { 170 struct sock *sk = sock->sk; 171 struct smc_sock *smc; 172 int rc = 0; 173 174 if (!sk) 175 goto out; 176 177 smc = smc_sk(sk); 178 179 /* cleanup for a dangling non-blocking connect */ 180 if (smc->connect_nonblock && sk->sk_state == SMC_INIT) 181 tcp_abort(smc->clcsock->sk, ECONNABORTED); 182 flush_work(&smc->connect_work); 183 184 if (sk->sk_state == SMC_LISTEN) 185 /* smc_close_non_accepted() is called and acquires 186 * sock lock for child sockets again 187 */ 188 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 189 else 190 lock_sock(sk); 191 192 rc = __smc_release(smc); 193 194 /* detach socket */ 195 sock_orphan(sk); 196 sock->sk = NULL; 197 release_sock(sk); 198 199 sock_put(sk); /* final sock_put */ 200 out: 201 return rc; 202 } 203 204 static void smc_destruct(struct sock *sk) 205 { 206 if (sk->sk_state != SMC_CLOSED) 207 return; 208 if (!sock_flag(sk, SOCK_DEAD)) 209 return; 210 211 sk_refcnt_debug_dec(sk); 212 } 213 214 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 215 int protocol) 216 { 217 struct smc_sock *smc; 218 struct proto *prot; 219 struct sock *sk; 220 221 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 222 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 223 if (!sk) 224 return NULL; 225 226 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 227 sk->sk_state = SMC_INIT; 228 sk->sk_destruct = smc_destruct; 229 sk->sk_protocol = protocol; 230 smc = smc_sk(sk); 231 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 232 INIT_WORK(&smc->connect_work, smc_connect_work); 233 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 234 INIT_LIST_HEAD(&smc->accept_q); 235 spin_lock_init(&smc->accept_q_lock); 236 spin_lock_init(&smc->conn.send_lock); 237 sk->sk_prot->hash(sk); 238 sk_refcnt_debug_inc(sk); 239 mutex_init(&smc->clcsock_release_lock); 240 241 return sk; 242 } 243 244 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 245 int addr_len) 246 { 247 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 248 struct sock *sk = sock->sk; 249 struct smc_sock *smc; 250 int rc; 251 252 smc = smc_sk(sk); 253 254 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 255 rc = -EINVAL; 256 if (addr_len < sizeof(struct sockaddr_in)) 257 goto out; 258 259 rc = -EAFNOSUPPORT; 260 if (addr->sin_family != AF_INET && 261 addr->sin_family != AF_INET6 && 262 addr->sin_family != AF_UNSPEC) 263 goto out; 264 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 265 if (addr->sin_family == AF_UNSPEC && 266 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 267 goto out; 268 269 lock_sock(sk); 270 271 /* Check if socket is already active */ 272 rc = -EINVAL; 273 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 274 goto out_rel; 275 276 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 277 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 278 279 out_rel: 280 release_sock(sk); 281 out: 282 return rc; 283 } 284 285 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 286 unsigned long mask) 287 { 288 /* options we don't get control via setsockopt for */ 289 nsk->sk_type = osk->sk_type; 290 nsk->sk_sndbuf = osk->sk_sndbuf; 291 nsk->sk_rcvbuf = osk->sk_rcvbuf; 292 nsk->sk_sndtimeo = osk->sk_sndtimeo; 293 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 294 nsk->sk_mark = osk->sk_mark; 295 nsk->sk_priority = osk->sk_priority; 296 nsk->sk_rcvlowat = osk->sk_rcvlowat; 297 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 298 nsk->sk_err = osk->sk_err; 299 300 nsk->sk_flags &= ~mask; 301 nsk->sk_flags |= osk->sk_flags & mask; 302 } 303 304 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 305 (1UL << SOCK_KEEPOPEN) | \ 306 (1UL << SOCK_LINGER) | \ 307 (1UL << SOCK_BROADCAST) | \ 308 (1UL << SOCK_TIMESTAMP) | \ 309 (1UL << SOCK_DBG) | \ 310 (1UL << SOCK_RCVTSTAMP) | \ 311 (1UL << SOCK_RCVTSTAMPNS) | \ 312 (1UL << SOCK_LOCALROUTE) | \ 313 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 314 (1UL << SOCK_RXQ_OVFL) | \ 315 (1UL << SOCK_WIFI_STATUS) | \ 316 (1UL << SOCK_NOFCS) | \ 317 (1UL << SOCK_FILTER_LOCKED) | \ 318 (1UL << SOCK_TSTAMP_NEW)) 319 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 320 * clc socket (since smc is not called for these options from net/core) 321 */ 322 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 323 { 324 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 325 } 326 327 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 328 (1UL << SOCK_KEEPOPEN) | \ 329 (1UL << SOCK_LINGER) | \ 330 (1UL << SOCK_DBG)) 331 /* copy only settings and flags relevant for smc from clc to smc socket */ 332 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 333 { 334 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 335 } 336 337 /* register a new rmb, send confirm_rkey msg to register with peer */ 338 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc, 339 bool conf_rkey) 340 { 341 if (!rmb_desc->wr_reg) { 342 /* register memory region for new rmb */ 343 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { 344 rmb_desc->regerr = 1; 345 return -EFAULT; 346 } 347 rmb_desc->wr_reg = 1; 348 } 349 if (!conf_rkey) 350 return 0; 351 /* exchange confirm_rkey msg with peer */ 352 if (smc_llc_do_confirm_rkey(link, rmb_desc)) { 353 rmb_desc->regerr = 1; 354 return -EFAULT; 355 } 356 return 0; 357 } 358 359 static int smc_clnt_conf_first_link(struct smc_sock *smc) 360 { 361 struct net *net = sock_net(smc->clcsock->sk); 362 struct smc_link_group *lgr = smc->conn.lgr; 363 struct smc_link *link; 364 int rest; 365 int rc; 366 367 link = &lgr->lnk[SMC_SINGLE_LINK]; 368 /* receive CONFIRM LINK request from server over RoCE fabric */ 369 rest = wait_for_completion_interruptible_timeout( 370 &link->llc_confirm, 371 SMC_LLC_WAIT_FIRST_TIME); 372 if (rest <= 0) { 373 struct smc_clc_msg_decline dclc; 374 375 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 376 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 377 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 378 } 379 380 if (link->llc_confirm_rc) 381 return SMC_CLC_DECL_RMBE_EC; 382 383 rc = smc_ib_modify_qp_rts(link); 384 if (rc) 385 return SMC_CLC_DECL_ERR_RDYLNK; 386 387 smc_wr_remember_qp_attr(link); 388 389 if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) 390 return SMC_CLC_DECL_ERR_REGRMB; 391 392 /* send CONFIRM LINK response over RoCE fabric */ 393 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 394 if (rc < 0) 395 return SMC_CLC_DECL_TIMEOUT_CL; 396 397 /* receive ADD LINK request from server over RoCE fabric */ 398 rest = wait_for_completion_interruptible_timeout(&link->llc_add, 399 SMC_LLC_WAIT_TIME); 400 if (rest <= 0) { 401 struct smc_clc_msg_decline dclc; 402 403 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 404 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 405 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc; 406 } 407 408 /* send add link reject message, only one link supported for now */ 409 rc = smc_llc_send_add_link(link, 410 link->smcibdev->mac[link->ibport - 1], 411 link->gid, SMC_LLC_RESP); 412 if (rc < 0) 413 return SMC_CLC_DECL_TIMEOUT_AL; 414 415 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); 416 417 return 0; 418 } 419 420 static void smcr_conn_save_peer_info(struct smc_sock *smc, 421 struct smc_clc_msg_accept_confirm *clc) 422 { 423 int bufsize = smc_uncompress_bufsize(clc->rmbe_size); 424 425 smc->conn.peer_rmbe_idx = clc->rmbe_idx; 426 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token); 427 smc->conn.peer_rmbe_size = bufsize; 428 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 429 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 430 } 431 432 static void smcd_conn_save_peer_info(struct smc_sock *smc, 433 struct smc_clc_msg_accept_confirm *clc) 434 { 435 int bufsize = smc_uncompress_bufsize(clc->dmbe_size); 436 437 smc->conn.peer_rmbe_idx = clc->dmbe_idx; 438 smc->conn.peer_token = clc->token; 439 /* msg header takes up space in the buffer */ 440 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 441 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 442 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 443 } 444 445 static void smc_conn_save_peer_info(struct smc_sock *smc, 446 struct smc_clc_msg_accept_confirm *clc) 447 { 448 if (smc->conn.lgr->is_smcd) 449 smcd_conn_save_peer_info(smc, clc); 450 else 451 smcr_conn_save_peer_info(smc, clc); 452 } 453 454 static void smc_link_save_peer_info(struct smc_link *link, 455 struct smc_clc_msg_accept_confirm *clc) 456 { 457 link->peer_qpn = ntoh24(clc->qpn); 458 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); 459 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); 460 link->peer_psn = ntoh24(clc->psn); 461 link->peer_mtu = clc->qp_mtu; 462 } 463 464 static void smc_switch_to_fallback(struct smc_sock *smc) 465 { 466 smc->use_fallback = true; 467 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 468 smc->clcsock->file = smc->sk.sk_socket->file; 469 smc->clcsock->file->private_data = smc->clcsock; 470 } 471 } 472 473 /* fall back during connect */ 474 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 475 { 476 smc_switch_to_fallback(smc); 477 smc->fallback_rsn = reason_code; 478 smc_copy_sock_settings_to_clc(smc); 479 smc->connect_nonblock = 0; 480 if (smc->sk.sk_state == SMC_INIT) 481 smc->sk.sk_state = SMC_ACTIVE; 482 return 0; 483 } 484 485 /* decline and fall back during connect */ 486 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code) 487 { 488 int rc; 489 490 if (reason_code < 0) { /* error, fallback is not possible */ 491 if (smc->sk.sk_state == SMC_INIT) 492 sock_put(&smc->sk); /* passive closing */ 493 return reason_code; 494 } 495 if (reason_code != SMC_CLC_DECL_PEERDECL) { 496 rc = smc_clc_send_decline(smc, reason_code); 497 if (rc < 0) { 498 if (smc->sk.sk_state == SMC_INIT) 499 sock_put(&smc->sk); /* passive closing */ 500 return rc; 501 } 502 } 503 return smc_connect_fallback(smc, reason_code); 504 } 505 506 /* abort connecting */ 507 static int smc_connect_abort(struct smc_sock *smc, int reason_code, 508 int local_contact) 509 { 510 if (local_contact == SMC_FIRST_CONTACT) 511 smc_lgr_forget(smc->conn.lgr); 512 if (smc->conn.lgr->is_smcd) 513 /* there is only one lgr role for SMC-D; use server lock */ 514 mutex_unlock(&smc_server_lgr_pending); 515 else 516 mutex_unlock(&smc_client_lgr_pending); 517 518 smc_conn_free(&smc->conn); 519 smc->connect_nonblock = 0; 520 return reason_code; 521 } 522 523 /* check if there is a rdma device available for this connection. */ 524 /* called for connect and listen */ 525 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 526 { 527 /* PNET table look up: search active ib_device and port 528 * within same PNETID that also contains the ethernet device 529 * used for the internal TCP socket 530 */ 531 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 532 if (!ini->ib_dev) 533 return SMC_CLC_DECL_NOSMCRDEV; 534 return 0; 535 } 536 537 /* check if there is an ISM device available for this connection. */ 538 /* called for connect and listen */ 539 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 540 { 541 /* Find ISM device with same PNETID as connecting interface */ 542 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 543 if (!ini->ism_dev) 544 return SMC_CLC_DECL_NOSMCDDEV; 545 return 0; 546 } 547 548 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 549 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 550 struct smc_init_info *ini) 551 { 552 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev, ini->vlan_id)) 553 return SMC_CLC_DECL_ISMVLANERR; 554 return 0; 555 } 556 557 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 558 * used, the VLAN ID will be registered again during the connection setup. 559 */ 560 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd, 561 struct smc_init_info *ini) 562 { 563 if (!is_smcd) 564 return 0; 565 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev, ini->vlan_id)) 566 return SMC_CLC_DECL_CNFERR; 567 return 0; 568 } 569 570 /* CLC handshake during connect */ 571 static int smc_connect_clc(struct smc_sock *smc, int smc_type, 572 struct smc_clc_msg_accept_confirm *aclc, 573 struct smc_init_info *ini) 574 { 575 int rc = 0; 576 577 /* do inband token exchange */ 578 rc = smc_clc_send_proposal(smc, smc_type, ini); 579 if (rc) 580 return rc; 581 /* receive SMC Accept CLC message */ 582 return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT, 583 CLC_WAIT_TIME); 584 } 585 586 /* setup for RDMA connection of client */ 587 static int smc_connect_rdma(struct smc_sock *smc, 588 struct smc_clc_msg_accept_confirm *aclc, 589 struct smc_init_info *ini) 590 { 591 struct smc_link *link; 592 int reason_code = 0; 593 594 ini->is_smcd = false; 595 ini->ib_lcl = &aclc->lcl; 596 ini->ib_clcqpn = ntoh24(aclc->qpn); 597 ini->srv_first_contact = aclc->hdr.flag; 598 599 mutex_lock(&smc_client_lgr_pending); 600 reason_code = smc_conn_create(smc, ini); 601 if (reason_code) { 602 mutex_unlock(&smc_client_lgr_pending); 603 return reason_code; 604 } 605 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 606 607 smc_conn_save_peer_info(smc, aclc); 608 609 /* create send buffer and rmb */ 610 if (smc_buf_create(smc, false)) 611 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 612 ini->cln_first_contact); 613 614 if (ini->cln_first_contact == SMC_FIRST_CONTACT) 615 smc_link_save_peer_info(link, aclc); 616 617 if (smc_rmb_rtoken_handling(&smc->conn, aclc)) 618 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK, 619 ini->cln_first_contact); 620 621 smc_close_init(smc); 622 smc_rx_init(smc); 623 624 if (ini->cln_first_contact == SMC_FIRST_CONTACT) { 625 if (smc_ib_ready_link(link)) 626 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK, 627 ini->cln_first_contact); 628 } else { 629 if (smc_reg_rmb(link, smc->conn.rmb_desc, true)) 630 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB, 631 ini->cln_first_contact); 632 } 633 smc_rmb_sync_sg_for_device(&smc->conn); 634 635 reason_code = smc_clc_send_confirm(smc); 636 if (reason_code) 637 return smc_connect_abort(smc, reason_code, 638 ini->cln_first_contact); 639 640 smc_tx_init(smc); 641 642 if (ini->cln_first_contact == SMC_FIRST_CONTACT) { 643 /* QP confirmation over RoCE fabric */ 644 reason_code = smc_clnt_conf_first_link(smc); 645 if (reason_code) 646 return smc_connect_abort(smc, reason_code, 647 ini->cln_first_contact); 648 } 649 mutex_unlock(&smc_client_lgr_pending); 650 651 smc_copy_sock_settings_to_clc(smc); 652 smc->connect_nonblock = 0; 653 if (smc->sk.sk_state == SMC_INIT) 654 smc->sk.sk_state = SMC_ACTIVE; 655 656 return 0; 657 } 658 659 /* setup for ISM connection of client */ 660 static int smc_connect_ism(struct smc_sock *smc, 661 struct smc_clc_msg_accept_confirm *aclc, 662 struct smc_init_info *ini) 663 { 664 int rc = 0; 665 666 ini->is_smcd = true; 667 ini->ism_gid = aclc->gid; 668 ini->srv_first_contact = aclc->hdr.flag; 669 670 /* there is only one lgr role for SMC-D; use server lock */ 671 mutex_lock(&smc_server_lgr_pending); 672 rc = smc_conn_create(smc, ini); 673 if (rc) { 674 mutex_unlock(&smc_server_lgr_pending); 675 return rc; 676 } 677 678 /* Create send and receive buffers */ 679 if (smc_buf_create(smc, true)) 680 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 681 ini->cln_first_contact); 682 683 smc_conn_save_peer_info(smc, aclc); 684 smc_close_init(smc); 685 smc_rx_init(smc); 686 smc_tx_init(smc); 687 688 rc = smc_clc_send_confirm(smc); 689 if (rc) 690 return smc_connect_abort(smc, rc, ini->cln_first_contact); 691 mutex_unlock(&smc_server_lgr_pending); 692 693 smc_copy_sock_settings_to_clc(smc); 694 smc->connect_nonblock = 0; 695 if (smc->sk.sk_state == SMC_INIT) 696 smc->sk.sk_state = SMC_ACTIVE; 697 698 return 0; 699 } 700 701 /* perform steps before actually connecting */ 702 static int __smc_connect(struct smc_sock *smc) 703 { 704 bool ism_supported = false, rdma_supported = false; 705 struct smc_clc_msg_accept_confirm aclc; 706 struct smc_init_info ini = {0}; 707 int smc_type; 708 int rc = 0; 709 710 if (smc->use_fallback) 711 return smc_connect_fallback(smc, smc->fallback_rsn); 712 713 /* if peer has not signalled SMC-capability, fall back */ 714 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 715 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 716 717 /* IPSec connections opt out of SMC-R optimizations */ 718 if (using_ipsec(smc)) 719 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC); 720 721 /* get vlan id from IP device */ 722 if (smc_vlan_by_tcpsk(smc->clcsock, &ini)) 723 return smc_connect_decline_fallback(smc, 724 SMC_CLC_DECL_GETVLANERR); 725 726 /* check if there is an ism device available */ 727 if (!smc_find_ism_device(smc, &ini) && 728 !smc_connect_ism_vlan_setup(smc, &ini)) { 729 /* ISM is supported for this connection */ 730 ism_supported = true; 731 smc_type = SMC_TYPE_D; 732 } 733 734 /* check if there is a rdma device available */ 735 if (!smc_find_rdma_device(smc, &ini)) { 736 /* RDMA is supported for this connection */ 737 rdma_supported = true; 738 if (ism_supported) 739 smc_type = SMC_TYPE_B; /* both */ 740 else 741 smc_type = SMC_TYPE_R; /* only RDMA */ 742 } 743 744 /* if neither ISM nor RDMA are supported, fallback */ 745 if (!rdma_supported && !ism_supported) 746 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV); 747 748 /* perform CLC handshake */ 749 rc = smc_connect_clc(smc, smc_type, &aclc, &ini); 750 if (rc) { 751 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); 752 return smc_connect_decline_fallback(smc, rc); 753 } 754 755 /* depending on previous steps, connect using rdma or ism */ 756 if (rdma_supported && aclc.hdr.path == SMC_TYPE_R) 757 rc = smc_connect_rdma(smc, &aclc, &ini); 758 else if (ism_supported && aclc.hdr.path == SMC_TYPE_D) 759 rc = smc_connect_ism(smc, &aclc, &ini); 760 else 761 rc = SMC_CLC_DECL_MODEUNSUPP; 762 if (rc) { 763 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); 764 return smc_connect_decline_fallback(smc, rc); 765 } 766 767 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); 768 return 0; 769 } 770 771 static void smc_connect_work(struct work_struct *work) 772 { 773 struct smc_sock *smc = container_of(work, struct smc_sock, 774 connect_work); 775 long timeo = smc->sk.sk_sndtimeo; 776 int rc = 0; 777 778 if (!timeo) 779 timeo = MAX_SCHEDULE_TIMEOUT; 780 lock_sock(smc->clcsock->sk); 781 if (smc->clcsock->sk->sk_err) { 782 smc->sk.sk_err = smc->clcsock->sk->sk_err; 783 } else if ((1 << smc->clcsock->sk->sk_state) & 784 (TCPF_SYN_SENT | TCP_SYN_RECV)) { 785 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 786 if ((rc == -EPIPE) && 787 ((1 << smc->clcsock->sk->sk_state) & 788 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 789 rc = 0; 790 } 791 release_sock(smc->clcsock->sk); 792 lock_sock(&smc->sk); 793 if (rc != 0 || smc->sk.sk_err) { 794 smc->sk.sk_state = SMC_CLOSED; 795 if (rc == -EPIPE || rc == -EAGAIN) 796 smc->sk.sk_err = EPIPE; 797 else if (signal_pending(current)) 798 smc->sk.sk_err = -sock_intr_errno(timeo); 799 goto out; 800 } 801 802 rc = __smc_connect(smc); 803 if (rc < 0) 804 smc->sk.sk_err = -rc; 805 806 out: 807 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 808 if (smc->sk.sk_err) { 809 smc->sk.sk_state_change(&smc->sk); 810 } else { /* allow polling before and after fallback decision */ 811 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 812 smc->sk.sk_write_space(&smc->sk); 813 } 814 } 815 release_sock(&smc->sk); 816 } 817 818 static int smc_connect(struct socket *sock, struct sockaddr *addr, 819 int alen, int flags) 820 { 821 struct sock *sk = sock->sk; 822 struct smc_sock *smc; 823 int rc = -EINVAL; 824 825 smc = smc_sk(sk); 826 827 /* separate smc parameter checking to be safe */ 828 if (alen < sizeof(addr->sa_family)) 829 goto out_err; 830 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 831 goto out_err; 832 833 lock_sock(sk); 834 switch (sk->sk_state) { 835 default: 836 goto out; 837 case SMC_ACTIVE: 838 rc = -EISCONN; 839 goto out; 840 case SMC_INIT: 841 rc = 0; 842 break; 843 } 844 845 smc_copy_sock_settings_to_clc(smc); 846 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 847 if (smc->connect_nonblock) { 848 rc = -EALREADY; 849 goto out; 850 } 851 rc = kernel_connect(smc->clcsock, addr, alen, flags); 852 if (rc && rc != -EINPROGRESS) 853 goto out; 854 855 sock_hold(&smc->sk); /* sock put in passive closing */ 856 if (flags & O_NONBLOCK) { 857 if (schedule_work(&smc->connect_work)) 858 smc->connect_nonblock = 1; 859 rc = -EINPROGRESS; 860 } else { 861 rc = __smc_connect(smc); 862 if (rc < 0) 863 goto out; 864 else 865 rc = 0; /* success cases including fallback */ 866 } 867 868 out: 869 release_sock(sk); 870 out_err: 871 return rc; 872 } 873 874 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 875 { 876 struct socket *new_clcsock = NULL; 877 struct sock *lsk = &lsmc->sk; 878 struct sock *new_sk; 879 int rc = -EINVAL; 880 881 release_sock(lsk); 882 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 883 if (!new_sk) { 884 rc = -ENOMEM; 885 lsk->sk_err = ENOMEM; 886 *new_smc = NULL; 887 lock_sock(lsk); 888 goto out; 889 } 890 *new_smc = smc_sk(new_sk); 891 892 mutex_lock(&lsmc->clcsock_release_lock); 893 if (lsmc->clcsock) 894 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); 895 mutex_unlock(&lsmc->clcsock_release_lock); 896 lock_sock(lsk); 897 if (rc < 0) 898 lsk->sk_err = -rc; 899 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 900 new_sk->sk_prot->unhash(new_sk); 901 if (new_clcsock) 902 sock_release(new_clcsock); 903 new_sk->sk_state = SMC_CLOSED; 904 sock_set_flag(new_sk, SOCK_DEAD); 905 sock_put(new_sk); /* final */ 906 *new_smc = NULL; 907 goto out; 908 } 909 910 (*new_smc)->clcsock = new_clcsock; 911 out: 912 return rc; 913 } 914 915 /* add a just created sock to the accept queue of the listen sock as 916 * candidate for a following socket accept call from user space 917 */ 918 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 919 { 920 struct smc_sock *par = smc_sk(parent); 921 922 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 923 spin_lock(&par->accept_q_lock); 924 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 925 spin_unlock(&par->accept_q_lock); 926 sk_acceptq_added(parent); 927 } 928 929 /* remove a socket from the accept queue of its parental listening socket */ 930 static void smc_accept_unlink(struct sock *sk) 931 { 932 struct smc_sock *par = smc_sk(sk)->listen_smc; 933 934 spin_lock(&par->accept_q_lock); 935 list_del_init(&smc_sk(sk)->accept_q); 936 spin_unlock(&par->accept_q_lock); 937 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 938 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 939 } 940 941 /* remove a sock from the accept queue to bind it to a new socket created 942 * for a socket accept call from user space 943 */ 944 struct sock *smc_accept_dequeue(struct sock *parent, 945 struct socket *new_sock) 946 { 947 struct smc_sock *isk, *n; 948 struct sock *new_sk; 949 950 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 951 new_sk = (struct sock *)isk; 952 953 smc_accept_unlink(new_sk); 954 if (new_sk->sk_state == SMC_CLOSED) { 955 new_sk->sk_prot->unhash(new_sk); 956 if (isk->clcsock) { 957 sock_release(isk->clcsock); 958 isk->clcsock = NULL; 959 } 960 sock_put(new_sk); /* final */ 961 continue; 962 } 963 if (new_sock) { 964 sock_graft(new_sk, new_sock); 965 if (isk->use_fallback) { 966 smc_sk(new_sk)->clcsock->file = new_sock->file; 967 isk->clcsock->file->private_data = isk->clcsock; 968 } 969 } 970 return new_sk; 971 } 972 return NULL; 973 } 974 975 /* clean up for a created but never accepted sock */ 976 void smc_close_non_accepted(struct sock *sk) 977 { 978 struct smc_sock *smc = smc_sk(sk); 979 980 lock_sock(sk); 981 if (!sk->sk_lingertime) 982 /* wait for peer closing */ 983 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 984 __smc_release(smc); 985 release_sock(sk); 986 sock_put(sk); /* final sock_put */ 987 } 988 989 static int smc_serv_conf_first_link(struct smc_sock *smc) 990 { 991 struct net *net = sock_net(smc->clcsock->sk); 992 struct smc_link_group *lgr = smc->conn.lgr; 993 struct smc_link *link; 994 int rest; 995 int rc; 996 997 link = &lgr->lnk[SMC_SINGLE_LINK]; 998 999 if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) 1000 return SMC_CLC_DECL_ERR_REGRMB; 1001 1002 /* send CONFIRM LINK request to client over the RoCE fabric */ 1003 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1004 if (rc < 0) 1005 return SMC_CLC_DECL_TIMEOUT_CL; 1006 1007 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1008 rest = wait_for_completion_interruptible_timeout( 1009 &link->llc_confirm_resp, 1010 SMC_LLC_WAIT_FIRST_TIME); 1011 if (rest <= 0) { 1012 struct smc_clc_msg_decline dclc; 1013 1014 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1015 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1016 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1017 } 1018 1019 if (link->llc_confirm_resp_rc) 1020 return SMC_CLC_DECL_RMBE_EC; 1021 1022 /* send ADD LINK request to client over the RoCE fabric */ 1023 rc = smc_llc_send_add_link(link, 1024 link->smcibdev->mac[link->ibport - 1], 1025 link->gid, SMC_LLC_REQ); 1026 if (rc < 0) 1027 return SMC_CLC_DECL_TIMEOUT_AL; 1028 1029 /* receive ADD LINK response from client over the RoCE fabric */ 1030 rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp, 1031 SMC_LLC_WAIT_TIME); 1032 if (rest <= 0) { 1033 struct smc_clc_msg_decline dclc; 1034 1035 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1036 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1037 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc; 1038 } 1039 1040 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); 1041 1042 return 0; 1043 } 1044 1045 /* listen worker: finish */ 1046 static void smc_listen_out(struct smc_sock *new_smc) 1047 { 1048 struct smc_sock *lsmc = new_smc->listen_smc; 1049 struct sock *newsmcsk = &new_smc->sk; 1050 1051 if (lsmc->sk.sk_state == SMC_LISTEN) { 1052 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1053 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1054 release_sock(&lsmc->sk); 1055 } else { /* no longer listening */ 1056 smc_close_non_accepted(newsmcsk); 1057 } 1058 1059 /* Wake up accept */ 1060 lsmc->sk.sk_data_ready(&lsmc->sk); 1061 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1062 } 1063 1064 /* listen worker: finish in state connected */ 1065 static void smc_listen_out_connected(struct smc_sock *new_smc) 1066 { 1067 struct sock *newsmcsk = &new_smc->sk; 1068 1069 sk_refcnt_debug_inc(newsmcsk); 1070 if (newsmcsk->sk_state == SMC_INIT) 1071 newsmcsk->sk_state = SMC_ACTIVE; 1072 1073 smc_listen_out(new_smc); 1074 } 1075 1076 /* listen worker: finish in error state */ 1077 static void smc_listen_out_err(struct smc_sock *new_smc) 1078 { 1079 struct sock *newsmcsk = &new_smc->sk; 1080 1081 if (newsmcsk->sk_state == SMC_INIT) 1082 sock_put(&new_smc->sk); /* passive closing */ 1083 newsmcsk->sk_state = SMC_CLOSED; 1084 smc_conn_free(&new_smc->conn); 1085 1086 smc_listen_out(new_smc); 1087 } 1088 1089 /* listen worker: decline and fall back if possible */ 1090 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1091 int local_contact) 1092 { 1093 /* RDMA setup failed, switch back to TCP */ 1094 if (local_contact == SMC_FIRST_CONTACT) 1095 smc_lgr_forget(new_smc->conn.lgr); 1096 if (reason_code < 0) { /* error, no fallback possible */ 1097 smc_listen_out_err(new_smc); 1098 return; 1099 } 1100 smc_conn_free(&new_smc->conn); 1101 smc_switch_to_fallback(new_smc); 1102 new_smc->fallback_rsn = reason_code; 1103 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1104 if (smc_clc_send_decline(new_smc, reason_code) < 0) { 1105 smc_listen_out_err(new_smc); 1106 return; 1107 } 1108 } 1109 smc_listen_out_connected(new_smc); 1110 } 1111 1112 /* listen worker: check prefixes */ 1113 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1114 struct smc_clc_msg_proposal *pclc) 1115 { 1116 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1117 struct socket *newclcsock = new_smc->clcsock; 1118 1119 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1120 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1121 return SMC_CLC_DECL_DIFFPREFIX; 1122 1123 return 0; 1124 } 1125 1126 /* listen worker: initialize connection and buffers */ 1127 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1128 struct smc_init_info *ini) 1129 { 1130 int rc; 1131 1132 /* allocate connection / link group */ 1133 rc = smc_conn_create(new_smc, ini); 1134 if (rc) 1135 return rc; 1136 1137 /* create send buffer and rmb */ 1138 if (smc_buf_create(new_smc, false)) 1139 return SMC_CLC_DECL_MEM; 1140 1141 return 0; 1142 } 1143 1144 /* listen worker: initialize connection and buffers for SMC-D */ 1145 static int smc_listen_ism_init(struct smc_sock *new_smc, 1146 struct smc_clc_msg_proposal *pclc, 1147 struct smc_init_info *ini) 1148 { 1149 struct smc_clc_msg_smcd *pclc_smcd; 1150 int rc; 1151 1152 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1153 ini->ism_gid = pclc_smcd->gid; 1154 rc = smc_conn_create(new_smc, ini); 1155 if (rc) 1156 return rc; 1157 1158 /* Check if peer can be reached via ISM device */ 1159 if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid, 1160 new_smc->conn.lgr->vlan_id, 1161 new_smc->conn.lgr->smcd)) { 1162 if (ini->cln_first_contact == SMC_FIRST_CONTACT) 1163 smc_lgr_forget(new_smc->conn.lgr); 1164 smc_conn_free(&new_smc->conn); 1165 return SMC_CLC_DECL_SMCDNOTALK; 1166 } 1167 1168 /* Create send and receive buffers */ 1169 if (smc_buf_create(new_smc, true)) { 1170 if (ini->cln_first_contact == SMC_FIRST_CONTACT) 1171 smc_lgr_forget(new_smc->conn.lgr); 1172 smc_conn_free(&new_smc->conn); 1173 return SMC_CLC_DECL_MEM; 1174 } 1175 1176 return 0; 1177 } 1178 1179 /* listen worker: register buffers */ 1180 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact) 1181 { 1182 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 1183 1184 if (local_contact != SMC_FIRST_CONTACT) { 1185 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) 1186 return SMC_CLC_DECL_ERR_REGRMB; 1187 } 1188 smc_rmb_sync_sg_for_device(&new_smc->conn); 1189 1190 return 0; 1191 } 1192 1193 /* listen worker: finish RDMA setup */ 1194 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 1195 struct smc_clc_msg_accept_confirm *cclc, 1196 int local_contact) 1197 { 1198 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; 1199 int reason_code = 0; 1200 1201 if (local_contact == SMC_FIRST_CONTACT) 1202 smc_link_save_peer_info(link, cclc); 1203 1204 if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) { 1205 reason_code = SMC_CLC_DECL_ERR_RTOK; 1206 goto decline; 1207 } 1208 1209 if (local_contact == SMC_FIRST_CONTACT) { 1210 if (smc_ib_ready_link(link)) { 1211 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1212 goto decline; 1213 } 1214 /* QP confirmation over RoCE fabric */ 1215 reason_code = smc_serv_conf_first_link(new_smc); 1216 if (reason_code) 1217 goto decline; 1218 } 1219 return 0; 1220 1221 decline: 1222 smc_listen_decline(new_smc, reason_code, local_contact); 1223 return reason_code; 1224 } 1225 1226 /* setup for RDMA connection of server */ 1227 static void smc_listen_work(struct work_struct *work) 1228 { 1229 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1230 smc_listen_work); 1231 struct socket *newclcsock = new_smc->clcsock; 1232 struct smc_clc_msg_accept_confirm cclc; 1233 struct smc_clc_msg_proposal *pclc; 1234 struct smc_init_info ini = {0}; 1235 bool ism_supported = false; 1236 u8 buf[SMC_CLC_MAX_LEN]; 1237 int rc = 0; 1238 1239 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 1240 return smc_listen_out_err(new_smc); 1241 1242 if (new_smc->use_fallback) { 1243 smc_listen_out_connected(new_smc); 1244 return; 1245 } 1246 1247 /* check if peer is smc capable */ 1248 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1249 smc_switch_to_fallback(new_smc); 1250 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; 1251 smc_listen_out_connected(new_smc); 1252 return; 1253 } 1254 1255 /* do inband token exchange - 1256 * wait for and receive SMC Proposal CLC message 1257 */ 1258 pclc = (struct smc_clc_msg_proposal *)&buf; 1259 rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN, 1260 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 1261 if (rc) 1262 goto out_decl; 1263 1264 /* IPSec connections opt out of SMC-R optimizations */ 1265 if (using_ipsec(new_smc)) { 1266 rc = SMC_CLC_DECL_IPSEC; 1267 goto out_decl; 1268 } 1269 1270 /* check for matching IP prefix and subnet length */ 1271 rc = smc_listen_prfx_check(new_smc, pclc); 1272 if (rc) 1273 goto out_decl; 1274 1275 /* get vlan id from IP device */ 1276 if (smc_vlan_by_tcpsk(new_smc->clcsock, &ini)) { 1277 rc = SMC_CLC_DECL_GETVLANERR; 1278 goto out_decl; 1279 } 1280 1281 mutex_lock(&smc_server_lgr_pending); 1282 smc_close_init(new_smc); 1283 smc_rx_init(new_smc); 1284 smc_tx_init(new_smc); 1285 1286 /* check if ISM is available */ 1287 if (pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) { 1288 ini.is_smcd = true; /* prepare ISM check */ 1289 rc = smc_find_ism_device(new_smc, &ini); 1290 if (!rc) 1291 rc = smc_listen_ism_init(new_smc, pclc, &ini); 1292 if (!rc) 1293 ism_supported = true; 1294 else if (pclc->hdr.path == SMC_TYPE_D) 1295 goto out_unlock; /* skip RDMA and decline */ 1296 } 1297 1298 /* check if RDMA is available */ 1299 if (!ism_supported) { /* SMC_TYPE_R or SMC_TYPE_B */ 1300 /* prepare RDMA check */ 1301 ini.is_smcd = false; 1302 ini.ism_dev = NULL; 1303 ini.ib_lcl = &pclc->lcl; 1304 rc = smc_find_rdma_device(new_smc, &ini); 1305 if (rc) { 1306 /* no RDMA device found */ 1307 if (pclc->hdr.path == SMC_TYPE_B) 1308 /* neither ISM nor RDMA device found */ 1309 rc = SMC_CLC_DECL_NOSMCDEV; 1310 goto out_unlock; 1311 } 1312 rc = smc_listen_rdma_init(new_smc, &ini); 1313 if (rc) 1314 goto out_unlock; 1315 rc = smc_listen_rdma_reg(new_smc, ini.cln_first_contact); 1316 if (rc) 1317 goto out_unlock; 1318 } 1319 1320 /* send SMC Accept CLC message */ 1321 rc = smc_clc_send_accept(new_smc, ini.cln_first_contact); 1322 if (rc) 1323 goto out_unlock; 1324 1325 /* SMC-D does not need this lock any more */ 1326 if (ism_supported) 1327 mutex_unlock(&smc_server_lgr_pending); 1328 1329 /* receive SMC Confirm CLC message */ 1330 rc = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), 1331 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 1332 if (rc) { 1333 if (!ism_supported) 1334 goto out_unlock; 1335 goto out_decl; 1336 } 1337 1338 /* finish worker */ 1339 if (!ism_supported) { 1340 rc = smc_listen_rdma_finish(new_smc, &cclc, 1341 ini.cln_first_contact); 1342 mutex_unlock(&smc_server_lgr_pending); 1343 if (rc) 1344 return; 1345 } 1346 smc_conn_save_peer_info(new_smc, &cclc); 1347 smc_listen_out_connected(new_smc); 1348 return; 1349 1350 out_unlock: 1351 mutex_unlock(&smc_server_lgr_pending); 1352 out_decl: 1353 smc_listen_decline(new_smc, rc, ini.cln_first_contact); 1354 } 1355 1356 static void smc_tcp_listen_work(struct work_struct *work) 1357 { 1358 struct smc_sock *lsmc = container_of(work, struct smc_sock, 1359 tcp_listen_work); 1360 struct sock *lsk = &lsmc->sk; 1361 struct smc_sock *new_smc; 1362 int rc = 0; 1363 1364 lock_sock(lsk); 1365 while (lsk->sk_state == SMC_LISTEN) { 1366 rc = smc_clcsock_accept(lsmc, &new_smc); 1367 if (rc) 1368 goto out; 1369 if (!new_smc) 1370 continue; 1371 1372 new_smc->listen_smc = lsmc; 1373 new_smc->use_fallback = lsmc->use_fallback; 1374 new_smc->fallback_rsn = lsmc->fallback_rsn; 1375 sock_hold(lsk); /* sock_put in smc_listen_work */ 1376 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 1377 smc_copy_sock_settings_to_smc(new_smc); 1378 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 1379 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 1380 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 1381 if (!schedule_work(&new_smc->smc_listen_work)) 1382 sock_put(&new_smc->sk); 1383 } 1384 1385 out: 1386 release_sock(lsk); 1387 sock_put(&lsmc->sk); /* sock_hold in smc_listen */ 1388 } 1389 1390 static int smc_listen(struct socket *sock, int backlog) 1391 { 1392 struct sock *sk = sock->sk; 1393 struct smc_sock *smc; 1394 int rc; 1395 1396 smc = smc_sk(sk); 1397 lock_sock(sk); 1398 1399 rc = -EINVAL; 1400 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 1401 smc->connect_nonblock) 1402 goto out; 1403 1404 rc = 0; 1405 if (sk->sk_state == SMC_LISTEN) { 1406 sk->sk_max_ack_backlog = backlog; 1407 goto out; 1408 } 1409 /* some socket options are handled in core, so we could not apply 1410 * them to the clc socket -- copy smc socket options to clc socket 1411 */ 1412 smc_copy_sock_settings_to_clc(smc); 1413 if (!smc->use_fallback) 1414 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1415 1416 rc = kernel_listen(smc->clcsock, backlog); 1417 if (rc) 1418 goto out; 1419 sk->sk_max_ack_backlog = backlog; 1420 sk->sk_ack_backlog = 0; 1421 sk->sk_state = SMC_LISTEN; 1422 sock_hold(sk); /* sock_hold in tcp_listen_worker */ 1423 if (!schedule_work(&smc->tcp_listen_work)) 1424 sock_put(sk); 1425 1426 out: 1427 release_sock(sk); 1428 return rc; 1429 } 1430 1431 static int smc_accept(struct socket *sock, struct socket *new_sock, 1432 int flags, bool kern) 1433 { 1434 struct sock *sk = sock->sk, *nsk; 1435 DECLARE_WAITQUEUE(wait, current); 1436 struct smc_sock *lsmc; 1437 long timeo; 1438 int rc = 0; 1439 1440 lsmc = smc_sk(sk); 1441 sock_hold(sk); /* sock_put below */ 1442 lock_sock(sk); 1443 1444 if (lsmc->sk.sk_state != SMC_LISTEN) { 1445 rc = -EINVAL; 1446 release_sock(sk); 1447 goto out; 1448 } 1449 1450 /* Wait for an incoming connection */ 1451 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1452 add_wait_queue_exclusive(sk_sleep(sk), &wait); 1453 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 1454 set_current_state(TASK_INTERRUPTIBLE); 1455 if (!timeo) { 1456 rc = -EAGAIN; 1457 break; 1458 } 1459 release_sock(sk); 1460 timeo = schedule_timeout(timeo); 1461 /* wakeup by sk_data_ready in smc_listen_work() */ 1462 sched_annotate_sleep(); 1463 lock_sock(sk); 1464 if (signal_pending(current)) { 1465 rc = sock_intr_errno(timeo); 1466 break; 1467 } 1468 } 1469 set_current_state(TASK_RUNNING); 1470 remove_wait_queue(sk_sleep(sk), &wait); 1471 1472 if (!rc) 1473 rc = sock_error(nsk); 1474 release_sock(sk); 1475 if (rc) 1476 goto out; 1477 1478 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 1479 /* wait till data arrives on the socket */ 1480 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 1481 MSEC_PER_SEC); 1482 if (smc_sk(nsk)->use_fallback) { 1483 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 1484 1485 lock_sock(clcsk); 1486 if (skb_queue_empty(&clcsk->sk_receive_queue)) 1487 sk_wait_data(clcsk, &timeo, NULL); 1488 release_sock(clcsk); 1489 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 1490 lock_sock(nsk); 1491 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 1492 release_sock(nsk); 1493 } 1494 } 1495 1496 out: 1497 sock_put(sk); /* sock_hold above */ 1498 return rc; 1499 } 1500 1501 static int smc_getname(struct socket *sock, struct sockaddr *addr, 1502 int peer) 1503 { 1504 struct smc_sock *smc; 1505 1506 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 1507 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 1508 return -ENOTCONN; 1509 1510 smc = smc_sk(sock->sk); 1511 1512 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 1513 } 1514 1515 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1516 { 1517 struct sock *sk = sock->sk; 1518 struct smc_sock *smc; 1519 int rc = -EPIPE; 1520 1521 smc = smc_sk(sk); 1522 lock_sock(sk); 1523 if ((sk->sk_state != SMC_ACTIVE) && 1524 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1525 (sk->sk_state != SMC_INIT)) 1526 goto out; 1527 1528 if (msg->msg_flags & MSG_FASTOPEN) { 1529 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 1530 smc_switch_to_fallback(smc); 1531 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 1532 } else { 1533 rc = -EINVAL; 1534 goto out; 1535 } 1536 } 1537 1538 if (smc->use_fallback) 1539 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 1540 else 1541 rc = smc_tx_sendmsg(smc, msg, len); 1542 out: 1543 release_sock(sk); 1544 return rc; 1545 } 1546 1547 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 1548 int flags) 1549 { 1550 struct sock *sk = sock->sk; 1551 struct smc_sock *smc; 1552 int rc = -ENOTCONN; 1553 1554 smc = smc_sk(sk); 1555 lock_sock(sk); 1556 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 1557 /* socket was connected before, no more data to read */ 1558 rc = 0; 1559 goto out; 1560 } 1561 if ((sk->sk_state == SMC_INIT) || 1562 (sk->sk_state == SMC_LISTEN) || 1563 (sk->sk_state == SMC_CLOSED)) 1564 goto out; 1565 1566 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 1567 rc = 0; 1568 goto out; 1569 } 1570 1571 if (smc->use_fallback) { 1572 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 1573 } else { 1574 msg->msg_namelen = 0; 1575 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 1576 } 1577 1578 out: 1579 release_sock(sk); 1580 return rc; 1581 } 1582 1583 static __poll_t smc_accept_poll(struct sock *parent) 1584 { 1585 struct smc_sock *isk = smc_sk(parent); 1586 __poll_t mask = 0; 1587 1588 spin_lock(&isk->accept_q_lock); 1589 if (!list_empty(&isk->accept_q)) 1590 mask = EPOLLIN | EPOLLRDNORM; 1591 spin_unlock(&isk->accept_q_lock); 1592 1593 return mask; 1594 } 1595 1596 static __poll_t smc_poll(struct file *file, struct socket *sock, 1597 poll_table *wait) 1598 { 1599 struct sock *sk = sock->sk; 1600 struct smc_sock *smc; 1601 __poll_t mask = 0; 1602 1603 if (!sk) 1604 return EPOLLNVAL; 1605 1606 smc = smc_sk(sock->sk); 1607 if (smc->use_fallback) { 1608 /* delegate to CLC child sock */ 1609 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 1610 sk->sk_err = smc->clcsock->sk->sk_err; 1611 } else { 1612 if (sk->sk_state != SMC_CLOSED) 1613 sock_poll_wait(file, sock, wait); 1614 if (sk->sk_err) 1615 mask |= EPOLLERR; 1616 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 1617 (sk->sk_state == SMC_CLOSED)) 1618 mask |= EPOLLHUP; 1619 if (sk->sk_state == SMC_LISTEN) { 1620 /* woken up by sk_data_ready in smc_listen_work() */ 1621 mask |= smc_accept_poll(sk); 1622 } else if (smc->use_fallback) { /* as result of connect_work()*/ 1623 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 1624 wait); 1625 sk->sk_err = smc->clcsock->sk->sk_err; 1626 } else { 1627 if ((sk->sk_state != SMC_INIT && 1628 atomic_read(&smc->conn.sndbuf_space)) || 1629 sk->sk_shutdown & SEND_SHUTDOWN) { 1630 mask |= EPOLLOUT | EPOLLWRNORM; 1631 } else { 1632 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1633 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1634 } 1635 if (atomic_read(&smc->conn.bytes_to_rcv)) 1636 mask |= EPOLLIN | EPOLLRDNORM; 1637 if (sk->sk_shutdown & RCV_SHUTDOWN) 1638 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 1639 if (sk->sk_state == SMC_APPCLOSEWAIT1) 1640 mask |= EPOLLIN; 1641 if (smc->conn.urg_state == SMC_URG_VALID) 1642 mask |= EPOLLPRI; 1643 } 1644 } 1645 1646 return mask; 1647 } 1648 1649 static int smc_shutdown(struct socket *sock, int how) 1650 { 1651 struct sock *sk = sock->sk; 1652 struct smc_sock *smc; 1653 int rc = -EINVAL; 1654 int rc1 = 0; 1655 1656 smc = smc_sk(sk); 1657 1658 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 1659 return rc; 1660 1661 lock_sock(sk); 1662 1663 rc = -ENOTCONN; 1664 if ((sk->sk_state != SMC_ACTIVE) && 1665 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 1666 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 1667 (sk->sk_state != SMC_APPCLOSEWAIT1) && 1668 (sk->sk_state != SMC_APPCLOSEWAIT2) && 1669 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 1670 goto out; 1671 if (smc->use_fallback) { 1672 rc = kernel_sock_shutdown(smc->clcsock, how); 1673 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 1674 if (sk->sk_shutdown == SHUTDOWN_MASK) 1675 sk->sk_state = SMC_CLOSED; 1676 goto out; 1677 } 1678 switch (how) { 1679 case SHUT_RDWR: /* shutdown in both directions */ 1680 rc = smc_close_active(smc); 1681 break; 1682 case SHUT_WR: 1683 rc = smc_close_shutdown_write(smc); 1684 break; 1685 case SHUT_RD: 1686 rc = 0; 1687 /* nothing more to do because peer is not involved */ 1688 break; 1689 } 1690 if (smc->clcsock) 1691 rc1 = kernel_sock_shutdown(smc->clcsock, how); 1692 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 1693 sk->sk_shutdown |= how + 1; 1694 1695 out: 1696 release_sock(sk); 1697 return rc ? rc : rc1; 1698 } 1699 1700 static int smc_setsockopt(struct socket *sock, int level, int optname, 1701 char __user *optval, unsigned int optlen) 1702 { 1703 struct sock *sk = sock->sk; 1704 struct smc_sock *smc; 1705 int val, rc; 1706 1707 smc = smc_sk(sk); 1708 1709 /* generic setsockopts reaching us here always apply to the 1710 * CLC socket 1711 */ 1712 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 1713 optval, optlen); 1714 if (smc->clcsock->sk->sk_err) { 1715 sk->sk_err = smc->clcsock->sk->sk_err; 1716 sk->sk_error_report(sk); 1717 } 1718 if (rc) 1719 return rc; 1720 1721 if (optlen < sizeof(int)) 1722 return -EINVAL; 1723 if (get_user(val, (int __user *)optval)) 1724 return -EFAULT; 1725 1726 lock_sock(sk); 1727 switch (optname) { 1728 case TCP_ULP: 1729 case TCP_FASTOPEN: 1730 case TCP_FASTOPEN_CONNECT: 1731 case TCP_FASTOPEN_KEY: 1732 case TCP_FASTOPEN_NO_COOKIE: 1733 /* option not supported by SMC */ 1734 if (sk->sk_state == SMC_INIT) { 1735 smc_switch_to_fallback(smc); 1736 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 1737 } else { 1738 if (!smc->use_fallback) 1739 rc = -EINVAL; 1740 } 1741 break; 1742 case TCP_NODELAY: 1743 if (sk->sk_state != SMC_INIT && 1744 sk->sk_state != SMC_LISTEN && 1745 sk->sk_state != SMC_CLOSED) { 1746 if (val && !smc->use_fallback) 1747 mod_delayed_work(system_wq, &smc->conn.tx_work, 1748 0); 1749 } 1750 break; 1751 case TCP_CORK: 1752 if (sk->sk_state != SMC_INIT && 1753 sk->sk_state != SMC_LISTEN && 1754 sk->sk_state != SMC_CLOSED) { 1755 if (!val && !smc->use_fallback) 1756 mod_delayed_work(system_wq, &smc->conn.tx_work, 1757 0); 1758 } 1759 break; 1760 case TCP_DEFER_ACCEPT: 1761 smc->sockopt_defer_accept = val; 1762 break; 1763 default: 1764 break; 1765 } 1766 release_sock(sk); 1767 1768 return rc; 1769 } 1770 1771 static int smc_getsockopt(struct socket *sock, int level, int optname, 1772 char __user *optval, int __user *optlen) 1773 { 1774 struct smc_sock *smc; 1775 1776 smc = smc_sk(sock->sk); 1777 /* socket options apply to the CLC socket */ 1778 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 1779 optval, optlen); 1780 } 1781 1782 static int smc_ioctl(struct socket *sock, unsigned int cmd, 1783 unsigned long arg) 1784 { 1785 union smc_host_cursor cons, urg; 1786 struct smc_connection *conn; 1787 struct smc_sock *smc; 1788 int answ; 1789 1790 smc = smc_sk(sock->sk); 1791 conn = &smc->conn; 1792 lock_sock(&smc->sk); 1793 if (smc->use_fallback) { 1794 if (!smc->clcsock) { 1795 release_sock(&smc->sk); 1796 return -EBADF; 1797 } 1798 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 1799 release_sock(&smc->sk); 1800 return answ; 1801 } 1802 switch (cmd) { 1803 case SIOCINQ: /* same as FIONREAD */ 1804 if (smc->sk.sk_state == SMC_LISTEN) { 1805 release_sock(&smc->sk); 1806 return -EINVAL; 1807 } 1808 if (smc->sk.sk_state == SMC_INIT || 1809 smc->sk.sk_state == SMC_CLOSED) 1810 answ = 0; 1811 else 1812 answ = atomic_read(&smc->conn.bytes_to_rcv); 1813 break; 1814 case SIOCOUTQ: 1815 /* output queue size (not send + not acked) */ 1816 if (smc->sk.sk_state == SMC_LISTEN) { 1817 release_sock(&smc->sk); 1818 return -EINVAL; 1819 } 1820 if (smc->sk.sk_state == SMC_INIT || 1821 smc->sk.sk_state == SMC_CLOSED) 1822 answ = 0; 1823 else 1824 answ = smc->conn.sndbuf_desc->len - 1825 atomic_read(&smc->conn.sndbuf_space); 1826 break; 1827 case SIOCOUTQNSD: 1828 /* output queue size (not send only) */ 1829 if (smc->sk.sk_state == SMC_LISTEN) { 1830 release_sock(&smc->sk); 1831 return -EINVAL; 1832 } 1833 if (smc->sk.sk_state == SMC_INIT || 1834 smc->sk.sk_state == SMC_CLOSED) 1835 answ = 0; 1836 else 1837 answ = smc_tx_prepared_sends(&smc->conn); 1838 break; 1839 case SIOCATMARK: 1840 if (smc->sk.sk_state == SMC_LISTEN) { 1841 release_sock(&smc->sk); 1842 return -EINVAL; 1843 } 1844 if (smc->sk.sk_state == SMC_INIT || 1845 smc->sk.sk_state == SMC_CLOSED) { 1846 answ = 0; 1847 } else { 1848 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 1849 smc_curs_copy(&urg, &conn->urg_curs, conn); 1850 answ = smc_curs_diff(conn->rmb_desc->len, 1851 &cons, &urg) == 1; 1852 } 1853 break; 1854 default: 1855 release_sock(&smc->sk); 1856 return -ENOIOCTLCMD; 1857 } 1858 release_sock(&smc->sk); 1859 1860 return put_user(answ, (int __user *)arg); 1861 } 1862 1863 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 1864 int offset, size_t size, int flags) 1865 { 1866 struct sock *sk = sock->sk; 1867 struct smc_sock *smc; 1868 int rc = -EPIPE; 1869 1870 smc = smc_sk(sk); 1871 lock_sock(sk); 1872 if (sk->sk_state != SMC_ACTIVE) { 1873 release_sock(sk); 1874 goto out; 1875 } 1876 release_sock(sk); 1877 if (smc->use_fallback) 1878 rc = kernel_sendpage(smc->clcsock, page, offset, 1879 size, flags); 1880 else 1881 rc = sock_no_sendpage(sock, page, offset, size, flags); 1882 1883 out: 1884 return rc; 1885 } 1886 1887 /* Map the affected portions of the rmbe into an spd, note the number of bytes 1888 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 1889 * updates till whenever a respective page has been fully processed. 1890 * Note that subsequent recv() calls have to wait till all splice() processing 1891 * completed. 1892 */ 1893 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 1894 struct pipe_inode_info *pipe, size_t len, 1895 unsigned int flags) 1896 { 1897 struct sock *sk = sock->sk; 1898 struct smc_sock *smc; 1899 int rc = -ENOTCONN; 1900 1901 smc = smc_sk(sk); 1902 lock_sock(sk); 1903 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 1904 /* socket was connected before, no more data to read */ 1905 rc = 0; 1906 goto out; 1907 } 1908 if (sk->sk_state == SMC_INIT || 1909 sk->sk_state == SMC_LISTEN || 1910 sk->sk_state == SMC_CLOSED) 1911 goto out; 1912 1913 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 1914 rc = 0; 1915 goto out; 1916 } 1917 1918 if (smc->use_fallback) { 1919 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 1920 pipe, len, flags); 1921 } else { 1922 if (*ppos) { 1923 rc = -ESPIPE; 1924 goto out; 1925 } 1926 if (flags & SPLICE_F_NONBLOCK) 1927 flags = MSG_DONTWAIT; 1928 else 1929 flags = 0; 1930 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 1931 } 1932 out: 1933 release_sock(sk); 1934 1935 return rc; 1936 } 1937 1938 /* must look like tcp */ 1939 static const struct proto_ops smc_sock_ops = { 1940 .family = PF_SMC, 1941 .owner = THIS_MODULE, 1942 .release = smc_release, 1943 .bind = smc_bind, 1944 .connect = smc_connect, 1945 .socketpair = sock_no_socketpair, 1946 .accept = smc_accept, 1947 .getname = smc_getname, 1948 .poll = smc_poll, 1949 .ioctl = smc_ioctl, 1950 .listen = smc_listen, 1951 .shutdown = smc_shutdown, 1952 .setsockopt = smc_setsockopt, 1953 .getsockopt = smc_getsockopt, 1954 .sendmsg = smc_sendmsg, 1955 .recvmsg = smc_recvmsg, 1956 .mmap = sock_no_mmap, 1957 .sendpage = smc_sendpage, 1958 .splice_read = smc_splice_read, 1959 }; 1960 1961 static int smc_create(struct net *net, struct socket *sock, int protocol, 1962 int kern) 1963 { 1964 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 1965 struct smc_sock *smc; 1966 struct sock *sk; 1967 int rc; 1968 1969 rc = -ESOCKTNOSUPPORT; 1970 if (sock->type != SOCK_STREAM) 1971 goto out; 1972 1973 rc = -EPROTONOSUPPORT; 1974 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 1975 goto out; 1976 1977 rc = -ENOBUFS; 1978 sock->ops = &smc_sock_ops; 1979 sk = smc_sock_alloc(net, sock, protocol); 1980 if (!sk) 1981 goto out; 1982 1983 /* create internal TCP socket for CLC handshake and fallback */ 1984 smc = smc_sk(sk); 1985 smc->use_fallback = false; /* assume rdma capability first */ 1986 smc->fallback_rsn = 0; 1987 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 1988 &smc->clcsock); 1989 if (rc) { 1990 sk_common_release(sk); 1991 goto out; 1992 } 1993 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 1994 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 1995 1996 out: 1997 return rc; 1998 } 1999 2000 static const struct net_proto_family smc_sock_family_ops = { 2001 .family = PF_SMC, 2002 .owner = THIS_MODULE, 2003 .create = smc_create, 2004 }; 2005 2006 unsigned int smc_net_id; 2007 2008 static __net_init int smc_net_init(struct net *net) 2009 { 2010 return smc_pnet_net_init(net); 2011 } 2012 2013 static void __net_exit smc_net_exit(struct net *net) 2014 { 2015 smc_pnet_net_exit(net); 2016 } 2017 2018 static struct pernet_operations smc_net_ops = { 2019 .init = smc_net_init, 2020 .exit = smc_net_exit, 2021 .id = &smc_net_id, 2022 .size = sizeof(struct smc_net), 2023 }; 2024 2025 static int __init smc_init(void) 2026 { 2027 int rc; 2028 2029 rc = register_pernet_subsys(&smc_net_ops); 2030 if (rc) 2031 return rc; 2032 2033 rc = smc_pnet_init(); 2034 if (rc) 2035 goto out_pernet_subsys; 2036 2037 rc = smc_llc_init(); 2038 if (rc) { 2039 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 2040 goto out_pnet; 2041 } 2042 2043 rc = smc_cdc_init(); 2044 if (rc) { 2045 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 2046 goto out_pnet; 2047 } 2048 2049 rc = proto_register(&smc_proto, 1); 2050 if (rc) { 2051 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 2052 goto out_pnet; 2053 } 2054 2055 rc = proto_register(&smc_proto6, 1); 2056 if (rc) { 2057 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 2058 goto out_proto; 2059 } 2060 2061 rc = sock_register(&smc_sock_family_ops); 2062 if (rc) { 2063 pr_err("%s: sock_register fails with %d\n", __func__, rc); 2064 goto out_proto6; 2065 } 2066 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 2067 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 2068 2069 rc = smc_ib_register_client(); 2070 if (rc) { 2071 pr_err("%s: ib_register fails with %d\n", __func__, rc); 2072 goto out_sock; 2073 } 2074 2075 static_branch_enable(&tcp_have_smc); 2076 return 0; 2077 2078 out_sock: 2079 sock_unregister(PF_SMC); 2080 out_proto6: 2081 proto_unregister(&smc_proto6); 2082 out_proto: 2083 proto_unregister(&smc_proto); 2084 out_pnet: 2085 smc_pnet_exit(); 2086 out_pernet_subsys: 2087 unregister_pernet_subsys(&smc_net_ops); 2088 2089 return rc; 2090 } 2091 2092 static void __exit smc_exit(void) 2093 { 2094 smc_core_exit(); 2095 static_branch_disable(&tcp_have_smc); 2096 smc_ib_unregister_client(); 2097 sock_unregister(PF_SMC); 2098 proto_unregister(&smc_proto6); 2099 proto_unregister(&smc_proto); 2100 smc_pnet_exit(); 2101 unregister_pernet_subsys(&smc_net_ops); 2102 } 2103 2104 module_init(smc_init); 2105 module_exit(smc_exit); 2106 2107 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 2108 MODULE_DESCRIPTION("smc socket address family"); 2109 MODULE_LICENSE("GPL"); 2110 MODULE_ALIAS_NETPROTO(PF_SMC); 2111