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