1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * AF_SMC protocol family socket handler keeping the AF_INET sock address type 6 * applies to SOCK_STREAM sockets only 7 * offers an alternative communication option for TCP-protocol sockets 8 * applicable with RoCE-cards only 9 * 10 * Initial restrictions: 11 * - support for alternate links postponed 12 * 13 * Copyright IBM Corp. 2016, 2018 14 * 15 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 16 * based on prototype from Frank Blaschka 17 */ 18 19 #define KMSG_COMPONENT "smc" 20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/socket.h> 24 #include <linux/workqueue.h> 25 #include <linux/in.h> 26 #include <linux/sched/signal.h> 27 #include <linux/if_vlan.h> 28 #include <linux/rcupdate_wait.h> 29 #include <linux/ctype.h> 30 #include <linux/splice.h> 31 32 #include <net/sock.h> 33 #include <net/inet_common.h> 34 #if IS_ENABLED(CONFIG_IPV6) 35 #include <net/ipv6.h> 36 #endif 37 #include <net/tcp.h> 38 #include <net/smc.h> 39 #include <asm/ioctls.h> 40 41 #include <net/net_namespace.h> 42 #include <net/netns/generic.h> 43 #include "smc_netns.h" 44 45 #include "smc.h" 46 #include "smc_clc.h" 47 #include "smc_llc.h" 48 #include "smc_cdc.h" 49 #include "smc_core.h" 50 #include "smc_ib.h" 51 #include "smc_ism.h" 52 #include "smc_pnet.h" 53 #include "smc_netlink.h" 54 #include "smc_tx.h" 55 #include "smc_rx.h" 56 #include "smc_close.h" 57 #include "smc_stats.h" 58 #include "smc_tracepoint.h" 59 #include "smc_sysctl.h" 60 #include "smc_loopback.h" 61 #include "smc_inet.h" 62 63 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group 64 * creation on server 65 */ 66 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group 67 * creation on client 68 */ 69 70 static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */ 71 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ 72 struct workqueue_struct *smc_close_wq; /* wq for close work */ 73 74 static void smc_tcp_listen_work(struct work_struct *); 75 static void smc_connect_work(struct work_struct *); 76 77 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb) 78 { 79 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 80 void *hdr; 81 82 if (cb_ctx->pos[0]) 83 goto out; 84 85 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 86 &smc_gen_nl_family, NLM_F_MULTI, 87 SMC_NETLINK_DUMP_HS_LIMITATION); 88 if (!hdr) 89 return -ENOMEM; 90 91 if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED, 92 sock_net(skb->sk)->smc.limit_smc_hs)) 93 goto err; 94 95 genlmsg_end(skb, hdr); 96 cb_ctx->pos[0] = 1; 97 out: 98 return skb->len; 99 err: 100 genlmsg_cancel(skb, hdr); 101 return -EMSGSIZE; 102 } 103 104 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info) 105 { 106 sock_net(skb->sk)->smc.limit_smc_hs = true; 107 return 0; 108 } 109 110 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info) 111 { 112 sock_net(skb->sk)->smc.limit_smc_hs = false; 113 return 0; 114 } 115 116 static void smc_set_keepalive(struct sock *sk, int val) 117 { 118 struct smc_sock *smc = smc_sk(sk); 119 120 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 121 } 122 123 static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, 124 struct sk_buff *skb, 125 struct request_sock *req, 126 struct dst_entry *dst, 127 struct request_sock *req_unhash, 128 bool *own_req) 129 { 130 struct smc_sock *smc; 131 struct sock *child; 132 133 smc = smc_clcsock_user_data(sk); 134 135 if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) > 136 sk->sk_max_ack_backlog) 137 goto drop; 138 139 if (sk_acceptq_is_full(&smc->sk)) { 140 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 141 goto drop; 142 } 143 144 /* passthrough to original syn recv sock fct */ 145 child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash, 146 own_req); 147 /* child must not inherit smc or its ops */ 148 if (child) { 149 rcu_assign_sk_user_data(child, NULL); 150 151 /* v4-mapped sockets don't inherit parent ops. Don't restore. */ 152 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops) 153 inet_csk(child)->icsk_af_ops = smc->ori_af_ops; 154 } 155 return child; 156 157 drop: 158 dst_release(dst); 159 tcp_listendrop(sk); 160 return NULL; 161 } 162 163 static bool smc_hs_congested(const struct sock *sk) 164 { 165 const struct smc_sock *smc; 166 167 smc = smc_clcsock_user_data(sk); 168 169 if (!smc) 170 return true; 171 172 if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) 173 return true; 174 175 return false; 176 } 177 178 struct smc_hashinfo smc_v4_hashinfo = { 179 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 180 }; 181 182 struct smc_hashinfo smc_v6_hashinfo = { 183 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 184 }; 185 186 int smc_hash_sk(struct sock *sk) 187 { 188 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 189 struct hlist_head *head; 190 191 head = &h->ht; 192 193 write_lock_bh(&h->lock); 194 sk_add_node(sk, head); 195 write_unlock_bh(&h->lock); 196 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 197 198 return 0; 199 } 200 201 void smc_unhash_sk(struct sock *sk) 202 { 203 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 204 205 write_lock_bh(&h->lock); 206 if (sk_del_node_init(sk)) 207 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 208 write_unlock_bh(&h->lock); 209 } 210 211 /* This will be called before user really release sock_lock. So do the 212 * work which we didn't do because of user hold the sock_lock in the 213 * BH context 214 */ 215 void smc_release_cb(struct sock *sk) 216 { 217 struct smc_sock *smc = smc_sk(sk); 218 219 if (smc->conn.tx_in_release_sock) { 220 smc_tx_pending(&smc->conn); 221 smc->conn.tx_in_release_sock = false; 222 } 223 } 224 225 struct proto smc_proto = { 226 .name = "SMC", 227 .owner = THIS_MODULE, 228 .keepalive = smc_set_keepalive, 229 .hash = smc_hash_sk, 230 .unhash = smc_unhash_sk, 231 .release_cb = smc_release_cb, 232 .obj_size = sizeof(struct smc_sock), 233 .h.smc_hash = &smc_v4_hashinfo, 234 .slab_flags = SLAB_TYPESAFE_BY_RCU, 235 }; 236 EXPORT_SYMBOL_GPL(smc_proto); 237 238 struct proto smc_proto6 = { 239 .name = "SMC6", 240 .owner = THIS_MODULE, 241 .keepalive = smc_set_keepalive, 242 .hash = smc_hash_sk, 243 .unhash = smc_unhash_sk, 244 .release_cb = smc_release_cb, 245 .obj_size = sizeof(struct smc_sock), 246 .h.smc_hash = &smc_v6_hashinfo, 247 .slab_flags = SLAB_TYPESAFE_BY_RCU, 248 }; 249 EXPORT_SYMBOL_GPL(smc_proto6); 250 251 static void smc_fback_restore_callbacks(struct smc_sock *smc) 252 { 253 struct sock *clcsk = smc->clcsock->sk; 254 255 write_lock_bh(&clcsk->sk_callback_lock); 256 clcsk->sk_user_data = NULL; 257 258 smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change); 259 smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready); 260 smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space); 261 smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report); 262 263 write_unlock_bh(&clcsk->sk_callback_lock); 264 } 265 266 static void smc_restore_fallback_changes(struct smc_sock *smc) 267 { 268 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ 269 smc->clcsock->file->private_data = smc->sk.sk_socket; 270 smc->clcsock->file = NULL; 271 smc_fback_restore_callbacks(smc); 272 } 273 } 274 275 static int __smc_release(struct smc_sock *smc) 276 { 277 struct sock *sk = &smc->sk; 278 int rc = 0; 279 280 if (!smc->use_fallback) { 281 rc = smc_close_active(smc); 282 smc_sock_set_flag(sk, SOCK_DEAD); 283 sk->sk_shutdown |= SHUTDOWN_MASK; 284 } else { 285 if (sk->sk_state != SMC_CLOSED) { 286 if (sk->sk_state != SMC_LISTEN && 287 sk->sk_state != SMC_INIT) 288 sock_put(sk); /* passive closing */ 289 if (sk->sk_state == SMC_LISTEN) { 290 /* wake up clcsock accept */ 291 rc = kernel_sock_shutdown(smc->clcsock, 292 SHUT_RDWR); 293 } 294 sk->sk_state = SMC_CLOSED; 295 sk->sk_state_change(sk); 296 } 297 smc_restore_fallback_changes(smc); 298 } 299 300 sk->sk_prot->unhash(sk); 301 302 if (sk->sk_state == SMC_CLOSED) { 303 if (smc->clcsock) { 304 release_sock(sk); 305 smc_clcsock_release(smc); 306 lock_sock(sk); 307 } 308 if (!smc->use_fallback) 309 smc_conn_free(&smc->conn); 310 } 311 312 return rc; 313 } 314 315 int smc_release(struct socket *sock) 316 { 317 struct sock *sk = sock->sk; 318 struct smc_sock *smc; 319 int old_state, rc = 0; 320 321 if (!sk) 322 goto out; 323 324 sock_hold(sk); /* sock_put below */ 325 smc = smc_sk(sk); 326 327 old_state = sk->sk_state; 328 329 /* cleanup for a dangling non-blocking connect */ 330 if (smc->connect_nonblock && old_state == SMC_INIT) 331 tcp_abort(smc->clcsock->sk, ECONNABORTED); 332 333 if (cancel_work_sync(&smc->connect_work)) 334 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */ 335 336 if (sk->sk_state == SMC_LISTEN) 337 /* smc_close_non_accepted() is called and acquires 338 * sock lock for child sockets again 339 */ 340 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 341 else 342 lock_sock(sk); 343 344 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE && 345 !smc->use_fallback) 346 smc_close_active_abort(smc); 347 348 rc = __smc_release(smc); 349 350 /* detach socket */ 351 sock_orphan(sk); 352 sock->sk = NULL; 353 release_sock(sk); 354 355 sock_put(sk); /* sock_hold above */ 356 sock_put(sk); /* final sock_put */ 357 out: 358 return rc; 359 } 360 361 static void smc_destruct(struct sock *sk) 362 { 363 if (sk->sk_state != SMC_CLOSED) 364 return; 365 if (!sock_flag(sk, SOCK_DEAD)) 366 return; 367 switch (sk->sk_family) { 368 case AF_INET: 369 inet_sock_destruct(sk); 370 break; 371 #if IS_ENABLED(CONFIG_IPV6) 372 case AF_INET6: 373 inet6_sock_destruct(sk); 374 break; 375 #endif 376 } 377 } 378 379 static struct lock_class_key smc_key; 380 static struct lock_class_key smc_slock_key; 381 382 void smc_sk_init(struct net *net, struct sock *sk, int protocol) 383 { 384 struct smc_sock *smc = smc_sk(sk); 385 386 sk->sk_state = SMC_INIT; 387 sk->sk_destruct = smc_destruct; 388 sk->sk_protocol = protocol; 389 WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem)); 390 WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem)); 391 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 392 INIT_WORK(&smc->connect_work, smc_connect_work); 393 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 394 INIT_LIST_HEAD(&smc->accept_q); 395 sock_lock_init_class_and_name(sk, "slock-AF_SMC", &smc_slock_key, 396 "sk_lock-AF_SMC", &smc_key); 397 spin_lock_init(&smc->accept_q_lock); 398 spin_lock_init(&smc->conn.send_lock); 399 sk->sk_prot->hash(sk); 400 mutex_init(&smc->clcsock_release_lock); 401 smc_init_saved_callbacks(smc); 402 smc->limit_smc_hs = net->smc.limit_smc_hs; 403 smc->use_fallback = false; /* assume rdma capability first */ 404 smc->fallback_rsn = 0; 405 smc_close_init(smc); 406 } 407 408 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 409 int protocol) 410 { 411 struct proto *prot; 412 struct sock *sk; 413 414 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 415 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 416 if (!sk) 417 return NULL; 418 419 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 420 smc_sk_init(net, sk, protocol); 421 422 return sk; 423 } 424 425 int smc_bind(struct socket *sock, struct sockaddr *uaddr, 426 int addr_len) 427 { 428 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 429 struct sock *sk = sock->sk; 430 struct smc_sock *smc; 431 int rc; 432 433 smc = smc_sk(sk); 434 435 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 436 rc = -EINVAL; 437 if (addr_len < sizeof(struct sockaddr_in)) 438 goto out; 439 440 rc = -EAFNOSUPPORT; 441 if (addr->sin_family != AF_INET && 442 addr->sin_family != AF_INET6 && 443 addr->sin_family != AF_UNSPEC) 444 goto out; 445 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 446 if (addr->sin_family == AF_UNSPEC && 447 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 448 goto out; 449 450 lock_sock(sk); 451 452 /* Check if socket is already active */ 453 rc = -EINVAL; 454 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 455 goto out_rel; 456 457 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 458 smc->clcsock->sk->sk_reuseport = sk->sk_reuseport; 459 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 460 461 out_rel: 462 release_sock(sk); 463 out: 464 return rc; 465 } 466 467 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 468 * clc socket (since smc is not called for these options from net/core) 469 */ 470 471 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 472 (1UL << SOCK_KEEPOPEN) | \ 473 (1UL << SOCK_LINGER) | \ 474 (1UL << SOCK_BROADCAST) | \ 475 (1UL << SOCK_TIMESTAMP) | \ 476 (1UL << SOCK_DBG) | \ 477 (1UL << SOCK_RCVTSTAMP) | \ 478 (1UL << SOCK_RCVTSTAMPNS) | \ 479 (1UL << SOCK_LOCALROUTE) | \ 480 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 481 (1UL << SOCK_RXQ_OVFL) | \ 482 (1UL << SOCK_WIFI_STATUS) | \ 483 (1UL << SOCK_NOFCS) | \ 484 (1UL << SOCK_FILTER_LOCKED) | \ 485 (1UL << SOCK_TSTAMP_NEW)) 486 487 /* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */ 488 static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk, 489 unsigned long mask) 490 { 491 nsk->sk_userlocks = osk->sk_userlocks; 492 if (osk->sk_userlocks & SOCK_SNDBUF_LOCK) 493 nsk->sk_sndbuf = osk->sk_sndbuf; 494 if (osk->sk_userlocks & SOCK_RCVBUF_LOCK) 495 nsk->sk_rcvbuf = osk->sk_rcvbuf; 496 } 497 498 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 499 unsigned long mask) 500 { 501 /* options we don't get control via setsockopt for */ 502 nsk->sk_type = osk->sk_type; 503 nsk->sk_sndtimeo = READ_ONCE(osk->sk_sndtimeo); 504 nsk->sk_rcvtimeo = READ_ONCE(osk->sk_rcvtimeo); 505 nsk->sk_mark = READ_ONCE(osk->sk_mark); 506 nsk->sk_priority = READ_ONCE(osk->sk_priority); 507 nsk->sk_rcvlowat = osk->sk_rcvlowat; 508 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 509 nsk->sk_err = osk->sk_err; 510 511 nsk->sk_flags &= ~mask; 512 nsk->sk_flags |= osk->sk_flags & mask; 513 514 smc_adjust_sock_bufsizes(nsk, osk, mask); 515 } 516 517 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 518 { 519 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 520 } 521 522 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 523 (1UL << SOCK_KEEPOPEN) | \ 524 (1UL << SOCK_LINGER) | \ 525 (1UL << SOCK_DBG)) 526 /* copy only settings and flags relevant for smc from clc to smc socket */ 527 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 528 { 529 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 530 } 531 532 /* register the new vzalloced sndbuf on all links */ 533 static int smcr_lgr_reg_sndbufs(struct smc_link *link, 534 struct smc_buf_desc *snd_desc) 535 { 536 struct smc_link_group *lgr = link->lgr; 537 int i, rc = 0; 538 539 if (!snd_desc->is_vm) 540 return -EINVAL; 541 542 /* protect against parallel smcr_link_reg_buf() */ 543 down_write(&lgr->llc_conf_mutex); 544 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 545 if (!smc_link_active(&lgr->lnk[i])) 546 continue; 547 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc); 548 if (rc) 549 break; 550 } 551 up_write(&lgr->llc_conf_mutex); 552 return rc; 553 } 554 555 /* register the new rmb on all links */ 556 static int smcr_lgr_reg_rmbs(struct smc_link *link, 557 struct smc_buf_desc *rmb_desc) 558 { 559 struct smc_link_group *lgr = link->lgr; 560 bool do_slow = false; 561 int i, rc = 0; 562 563 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 564 if (rc) 565 return rc; 566 567 down_read(&lgr->llc_conf_mutex); 568 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 569 if (!smc_link_active(&lgr->lnk[i])) 570 continue; 571 if (!rmb_desc->is_reg_mr[link->link_idx]) { 572 up_read(&lgr->llc_conf_mutex); 573 goto slow_path; 574 } 575 } 576 /* mr register already */ 577 goto fast_path; 578 slow_path: 579 do_slow = true; 580 /* protect against parallel smc_llc_cli_rkey_exchange() and 581 * parallel smcr_link_reg_buf() 582 */ 583 down_write(&lgr->llc_conf_mutex); 584 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 585 if (!smc_link_active(&lgr->lnk[i])) 586 continue; 587 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc); 588 if (rc) 589 goto out; 590 } 591 fast_path: 592 /* exchange confirm_rkey msg with peer */ 593 rc = smc_llc_do_confirm_rkey(link, rmb_desc); 594 if (rc) { 595 rc = -EFAULT; 596 goto out; 597 } 598 rmb_desc->is_conf_rkey = true; 599 out: 600 do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex); 601 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 602 return rc; 603 } 604 605 static int smcr_clnt_conf_first_link(struct smc_sock *smc) 606 { 607 struct smc_link *link = smc->conn.lnk; 608 struct smc_llc_qentry *qentry; 609 int rc; 610 611 /* Receive CONFIRM LINK request from server over RoCE fabric. 612 * Increasing the client's timeout by twice as much as the server's 613 * timeout by default can temporarily avoid decline messages of 614 * both sides crossing or colliding 615 */ 616 qentry = smc_llc_wait(link->lgr, NULL, 2 * SMC_LLC_WAIT_TIME, 617 SMC_LLC_CONFIRM_LINK); 618 if (!qentry) { 619 struct smc_clc_msg_decline dclc; 620 621 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 622 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 623 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 624 } 625 smc_llc_save_peer_uid(qentry); 626 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); 627 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 628 if (rc) 629 return SMC_CLC_DECL_RMBE_EC; 630 631 rc = smc_ib_modify_qp_rts(link); 632 if (rc) 633 return SMC_CLC_DECL_ERR_RDYLNK; 634 635 smc_wr_remember_qp_attr(link); 636 637 /* reg the sndbuf if it was vzalloced */ 638 if (smc->conn.sndbuf_desc->is_vm) { 639 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) 640 return SMC_CLC_DECL_ERR_REGBUF; 641 } 642 643 /* reg the rmb */ 644 if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) 645 return SMC_CLC_DECL_ERR_REGBUF; 646 647 /* confirm_rkey is implicit on 1st contact */ 648 smc->conn.rmb_desc->is_conf_rkey = true; 649 650 /* send CONFIRM LINK response over RoCE fabric */ 651 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 652 if (rc < 0) 653 return SMC_CLC_DECL_TIMEOUT_CL; 654 655 smc_llc_link_active(link); 656 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 657 658 if (link->lgr->max_links > 1) { 659 /* optional 2nd link, receive ADD LINK request from server */ 660 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 661 SMC_LLC_ADD_LINK); 662 if (!qentry) { 663 struct smc_clc_msg_decline dclc; 664 665 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 666 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 667 if (rc == -EAGAIN) 668 rc = 0; /* no DECLINE received, go with one link */ 669 return rc; 670 } 671 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); 672 smc_llc_cli_add_link(link, qentry); 673 } 674 return 0; 675 } 676 677 static bool smc_isascii(char *hostname) 678 { 679 int i; 680 681 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) 682 if (!isascii(hostname[i])) 683 return false; 684 return true; 685 } 686 687 static void smc_conn_save_peer_info_fce(struct smc_sock *smc, 688 struct smc_clc_msg_accept_confirm *clc) 689 { 690 struct smc_clc_first_contact_ext *fce; 691 int clc_v2_len; 692 693 if (clc->hdr.version == SMC_V1 || 694 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 695 return; 696 697 if (smc->conn.lgr->is_smcd) { 698 memcpy(smc->conn.lgr->negotiated_eid, clc->d1.eid, 699 SMC_MAX_EID_LEN); 700 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, d1); 701 } else { 702 memcpy(smc->conn.lgr->negotiated_eid, clc->r1.eid, 703 SMC_MAX_EID_LEN); 704 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, r1); 705 } 706 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len); 707 smc->conn.lgr->peer_os = fce->os_type; 708 smc->conn.lgr->peer_smc_release = fce->release; 709 if (smc_isascii(fce->hostname)) 710 memcpy(smc->conn.lgr->peer_hostname, fce->hostname, 711 SMC_MAX_HOSTNAME_LEN); 712 } 713 714 static void smcr_conn_save_peer_info(struct smc_sock *smc, 715 struct smc_clc_msg_accept_confirm *clc) 716 { 717 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); 718 719 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; 720 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); 721 smc->conn.peer_rmbe_size = bufsize; 722 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 723 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 724 } 725 726 static void smcd_conn_save_peer_info(struct smc_sock *smc, 727 struct smc_clc_msg_accept_confirm *clc) 728 { 729 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); 730 731 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; 732 smc->conn.peer_token = ntohll(clc->d0.token); 733 /* msg header takes up space in the buffer */ 734 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 735 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 736 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 737 } 738 739 static void smc_conn_save_peer_info(struct smc_sock *smc, 740 struct smc_clc_msg_accept_confirm *clc) 741 { 742 if (smc->conn.lgr->is_smcd) 743 smcd_conn_save_peer_info(smc, clc); 744 else 745 smcr_conn_save_peer_info(smc, clc); 746 smc_conn_save_peer_info_fce(smc, clc); 747 } 748 749 static void smc_link_save_peer_info(struct smc_link *link, 750 struct smc_clc_msg_accept_confirm *clc, 751 struct smc_init_info *ini) 752 { 753 link->peer_qpn = ntoh24(clc->r0.qpn); 754 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE); 755 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac)); 756 link->peer_psn = ntoh24(clc->r0.psn); 757 link->peer_mtu = clc->r0.qp_mtu; 758 } 759 760 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc, 761 struct smc_stats_fback *fback_arr) 762 { 763 int cnt; 764 765 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) { 766 if (fback_arr[cnt].fback_code == smc->fallback_rsn) { 767 fback_arr[cnt].count++; 768 break; 769 } 770 if (!fback_arr[cnt].fback_code) { 771 fback_arr[cnt].fback_code = smc->fallback_rsn; 772 fback_arr[cnt].count++; 773 break; 774 } 775 } 776 } 777 778 static void smc_stat_fallback(struct smc_sock *smc) 779 { 780 struct net *net = sock_net(&smc->sk); 781 782 mutex_lock(&net->smc.mutex_fback_rsn); 783 if (smc->listen_smc) { 784 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv); 785 net->smc.fback_rsn->srv_fback_cnt++; 786 } else { 787 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt); 788 net->smc.fback_rsn->clnt_fback_cnt++; 789 } 790 mutex_unlock(&net->smc.mutex_fback_rsn); 791 } 792 793 /* must be called under rcu read lock */ 794 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key) 795 { 796 struct socket_wq *wq; 797 __poll_t flags; 798 799 wq = rcu_dereference(smc->sk.sk_wq); 800 if (!skwq_has_sleeper(wq)) 801 return; 802 803 /* wake up smc sk->sk_wq */ 804 if (!key) { 805 /* sk_state_change */ 806 wake_up_interruptible_all(&wq->wait); 807 } else { 808 flags = key_to_poll(key); 809 if (flags & (EPOLLIN | EPOLLOUT)) 810 /* sk_data_ready or sk_write_space */ 811 wake_up_interruptible_sync_poll(&wq->wait, flags); 812 else if (flags & EPOLLERR) 813 /* sk_error_report */ 814 wake_up_interruptible_poll(&wq->wait, flags); 815 } 816 } 817 818 static int smc_fback_mark_woken(wait_queue_entry_t *wait, 819 unsigned int mode, int sync, void *key) 820 { 821 struct smc_mark_woken *mark = 822 container_of(wait, struct smc_mark_woken, wait_entry); 823 824 mark->woken = true; 825 mark->key = key; 826 return 0; 827 } 828 829 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk, 830 void (*clcsock_callback)(struct sock *sk)) 831 { 832 struct smc_mark_woken mark = { .woken = false }; 833 struct socket_wq *wq; 834 835 init_waitqueue_func_entry(&mark.wait_entry, 836 smc_fback_mark_woken); 837 rcu_read_lock(); 838 wq = rcu_dereference(clcsk->sk_wq); 839 if (!wq) 840 goto out; 841 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 842 clcsock_callback(clcsk); 843 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 844 845 if (mark.woken) 846 smc_fback_wakeup_waitqueue(smc, mark.key); 847 out: 848 rcu_read_unlock(); 849 } 850 851 static void smc_fback_state_change(struct sock *clcsk) 852 { 853 struct smc_sock *smc; 854 855 read_lock_bh(&clcsk->sk_callback_lock); 856 smc = smc_clcsock_user_data(clcsk); 857 if (smc) 858 smc_fback_forward_wakeup(smc, clcsk, 859 smc->clcsk_state_change); 860 read_unlock_bh(&clcsk->sk_callback_lock); 861 } 862 863 static void smc_fback_data_ready(struct sock *clcsk) 864 { 865 struct smc_sock *smc; 866 867 read_lock_bh(&clcsk->sk_callback_lock); 868 smc = smc_clcsock_user_data(clcsk); 869 if (smc) 870 smc_fback_forward_wakeup(smc, clcsk, 871 smc->clcsk_data_ready); 872 read_unlock_bh(&clcsk->sk_callback_lock); 873 } 874 875 static void smc_fback_write_space(struct sock *clcsk) 876 { 877 struct smc_sock *smc; 878 879 read_lock_bh(&clcsk->sk_callback_lock); 880 smc = smc_clcsock_user_data(clcsk); 881 if (smc) 882 smc_fback_forward_wakeup(smc, clcsk, 883 smc->clcsk_write_space); 884 read_unlock_bh(&clcsk->sk_callback_lock); 885 } 886 887 static void smc_fback_error_report(struct sock *clcsk) 888 { 889 struct smc_sock *smc; 890 891 read_lock_bh(&clcsk->sk_callback_lock); 892 smc = smc_clcsock_user_data(clcsk); 893 if (smc) 894 smc_fback_forward_wakeup(smc, clcsk, 895 smc->clcsk_error_report); 896 read_unlock_bh(&clcsk->sk_callback_lock); 897 } 898 899 static void smc_fback_replace_callbacks(struct smc_sock *smc) 900 { 901 struct sock *clcsk = smc->clcsock->sk; 902 903 write_lock_bh(&clcsk->sk_callback_lock); 904 clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 905 906 smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change, 907 &smc->clcsk_state_change); 908 smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready, 909 &smc->clcsk_data_ready); 910 smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space, 911 &smc->clcsk_write_space); 912 smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report, 913 &smc->clcsk_error_report); 914 915 write_unlock_bh(&clcsk->sk_callback_lock); 916 } 917 918 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code) 919 { 920 int rc = 0; 921 922 mutex_lock(&smc->clcsock_release_lock); 923 if (!smc->clcsock) { 924 rc = -EBADF; 925 goto out; 926 } 927 928 smc->use_fallback = true; 929 smc->fallback_rsn = reason_code; 930 smc_stat_fallback(smc); 931 trace_smc_switch_to_fallback(smc, reason_code); 932 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 933 smc->clcsock->file = smc->sk.sk_socket->file; 934 smc->clcsock->file->private_data = smc->clcsock; 935 smc->clcsock->wq.fasync_list = 936 smc->sk.sk_socket->wq.fasync_list; 937 smc->sk.sk_socket->wq.fasync_list = NULL; 938 939 /* There might be some wait entries remaining 940 * in smc sk->sk_wq and they should be woken up 941 * as clcsock's wait queue is woken up. 942 */ 943 smc_fback_replace_callbacks(smc); 944 } 945 out: 946 mutex_unlock(&smc->clcsock_release_lock); 947 return rc; 948 } 949 950 /* fall back during connect */ 951 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 952 { 953 struct net *net = sock_net(&smc->sk); 954 int rc = 0; 955 956 rc = smc_switch_to_fallback(smc, reason_code); 957 if (rc) { /* fallback fails */ 958 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 959 if (smc->sk.sk_state == SMC_INIT) 960 sock_put(&smc->sk); /* passive closing */ 961 return rc; 962 } 963 smc_copy_sock_settings_to_clc(smc); 964 smc->connect_nonblock = 0; 965 if (smc->sk.sk_state == SMC_INIT) 966 smc->sk.sk_state = SMC_ACTIVE; 967 return 0; 968 } 969 970 /* decline and fall back during connect */ 971 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 972 u8 version) 973 { 974 struct net *net = sock_net(&smc->sk); 975 int rc; 976 977 if (reason_code < 0) { /* error, fallback is not possible */ 978 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 979 if (smc->sk.sk_state == SMC_INIT) 980 sock_put(&smc->sk); /* passive closing */ 981 return reason_code; 982 } 983 if (reason_code != SMC_CLC_DECL_PEERDECL) { 984 rc = smc_clc_send_decline(smc, reason_code, version); 985 if (rc < 0) { 986 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 987 if (smc->sk.sk_state == SMC_INIT) 988 sock_put(&smc->sk); /* passive closing */ 989 return rc; 990 } 991 } 992 return smc_connect_fallback(smc, reason_code); 993 } 994 995 static void smc_conn_abort(struct smc_sock *smc, int local_first) 996 { 997 struct smc_connection *conn = &smc->conn; 998 struct smc_link_group *lgr = conn->lgr; 999 bool lgr_valid = false; 1000 1001 if (smc_conn_lgr_valid(conn)) 1002 lgr_valid = true; 1003 1004 smc_conn_free(conn); 1005 if (local_first && lgr_valid) 1006 smc_lgr_cleanup_early(lgr); 1007 } 1008 1009 /* check if there is a rdma device available for this connection. */ 1010 /* called for connect and listen */ 1011 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 1012 { 1013 /* PNET table look up: search active ib_device and port 1014 * within same PNETID that also contains the ethernet device 1015 * used for the internal TCP socket 1016 */ 1017 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 1018 if (!ini->check_smcrv2 && !ini->ib_dev) 1019 return SMC_CLC_DECL_NOSMCRDEV; 1020 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) 1021 return SMC_CLC_DECL_NOSMCRDEV; 1022 return 0; 1023 } 1024 1025 /* check if there is an ISM device available for this connection. */ 1026 /* called for connect and listen */ 1027 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 1028 { 1029 /* Find ISM device with same PNETID as connecting interface */ 1030 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 1031 if (!ini->ism_dev[0]) 1032 return SMC_CLC_DECL_NOSMCDDEV; 1033 else 1034 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 1035 return 0; 1036 } 1037 1038 /* is chid unique for the ism devices that are already determined? */ 1039 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 1040 int cnt) 1041 { 1042 int i = (!ini->ism_dev[0]) ? 1 : 0; 1043 1044 for (; i < cnt; i++) 1045 if (ini->ism_chid[i] == chid) 1046 return false; 1047 return true; 1048 } 1049 1050 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus 1051 * PNETID matching net_device) 1052 */ 1053 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 1054 struct smc_init_info *ini) 1055 { 1056 int rc = SMC_CLC_DECL_NOSMCDDEV; 1057 struct smcd_dev *smcd; 1058 int i = 1, entry = 1; 1059 bool is_emulated; 1060 u16 chid; 1061 1062 if (smcd_indicated(ini->smc_type_v1)) 1063 rc = 0; /* already initialized for V1 */ 1064 mutex_lock(&smcd_dev_list.mutex); 1065 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1066 if (smcd->going_away || smcd == ini->ism_dev[0]) 1067 continue; 1068 chid = smc_ism_get_chid(smcd); 1069 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 1070 continue; 1071 is_emulated = __smc_ism_is_emulated(chid); 1072 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 1073 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 1074 if (is_emulated && entry == SMCD_CLC_MAX_V2_GID_ENTRIES) 1075 /* It's the last GID-CHID entry left in CLC 1076 * Proposal SMC-Dv2 extension, but an Emulated- 1077 * ISM device will take two entries. So give 1078 * up it and try the next potential ISM device. 1079 */ 1080 continue; 1081 ini->ism_dev[i] = smcd; 1082 ini->ism_chid[i] = chid; 1083 ini->is_smcd = true; 1084 rc = 0; 1085 i++; 1086 entry = is_emulated ? entry + 2 : entry + 1; 1087 if (entry > SMCD_CLC_MAX_V2_GID_ENTRIES) 1088 break; 1089 } 1090 } 1091 mutex_unlock(&smcd_dev_list.mutex); 1092 ini->ism_offered_cnt = i - 1; 1093 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 1094 ini->smcd_version = 0; 1095 1096 return rc; 1097 } 1098 1099 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 1100 static int smc_connect_ism_vlan_setup(struct smc_init_info *ini) 1101 { 1102 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 1103 return SMC_CLC_DECL_ISMVLANERR; 1104 return 0; 1105 } 1106 1107 static int smc_find_proposal_devices(struct smc_sock *smc, 1108 struct smc_init_info *ini) 1109 { 1110 int rc = 0; 1111 1112 /* check if there is an ism device available */ 1113 if (!(ini->smcd_version & SMC_V1) || 1114 smc_find_ism_device(smc, ini) || 1115 smc_connect_ism_vlan_setup(ini)) 1116 ini->smcd_version &= ~SMC_V1; 1117 /* else ISM V1 is supported for this connection */ 1118 1119 /* check if there is an rdma device available */ 1120 if (!(ini->smcr_version & SMC_V1) || 1121 smc_find_rdma_device(smc, ini)) 1122 ini->smcr_version &= ~SMC_V1; 1123 /* else RDMA is supported for this connection */ 1124 1125 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 1126 ini->smcr_version & SMC_V1); 1127 1128 /* check if there is an ism v2 device available */ 1129 if (!(ini->smcd_version & SMC_V2) || 1130 !smc_ism_is_v2_capable() || 1131 smc_find_ism_v2_device_clnt(smc, ini)) 1132 ini->smcd_version &= ~SMC_V2; 1133 1134 /* check if there is an rdma v2 device available */ 1135 ini->check_smcrv2 = true; 1136 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 1137 if (!(ini->smcr_version & SMC_V2) || 1138 #if IS_ENABLED(CONFIG_IPV6) 1139 (smc->clcsock->sk->sk_family == AF_INET6 && 1140 !ipv6_addr_v4mapped(&smc->clcsock->sk->sk_v6_rcv_saddr)) || 1141 #endif 1142 !smc_clc_ueid_count() || 1143 smc_find_rdma_device(smc, ini)) 1144 ini->smcr_version &= ~SMC_V2; 1145 ini->check_smcrv2 = false; 1146 1147 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 1148 ini->smcr_version & SMC_V2); 1149 1150 /* if neither ISM nor RDMA are supported, fallback */ 1151 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 1152 rc = SMC_CLC_DECL_NOSMCDEV; 1153 1154 return rc; 1155 } 1156 1157 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 1158 * used, the VLAN ID will be registered again during the connection setup. 1159 */ 1160 static int smc_connect_ism_vlan_cleanup(struct smc_init_info *ini) 1161 { 1162 if (!smcd_indicated(ini->smc_type_v1)) 1163 return 0; 1164 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 1165 return SMC_CLC_DECL_CNFERR; 1166 return 0; 1167 } 1168 1169 #define SMC_CLC_MAX_ACCEPT_LEN \ 1170 (sizeof(struct smc_clc_msg_accept_confirm) + \ 1171 sizeof(struct smc_clc_first_contact_ext_v2x) + \ 1172 sizeof(struct smc_clc_msg_trail)) 1173 1174 /* CLC handshake during connect */ 1175 static int smc_connect_clc(struct smc_sock *smc, 1176 struct smc_clc_msg_accept_confirm *aclc, 1177 struct smc_init_info *ini) 1178 { 1179 int rc = 0; 1180 1181 /* do inband token exchange */ 1182 rc = smc_clc_send_proposal(smc, ini); 1183 if (rc) 1184 return rc; 1185 /* receive SMC Accept CLC message */ 1186 return smc_clc_wait_msg(smc, aclc, SMC_CLC_MAX_ACCEPT_LEN, 1187 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 1188 } 1189 1190 void smc_fill_gid_list(struct smc_link_group *lgr, 1191 struct smc_gidlist *gidlist, 1192 struct smc_ib_device *known_dev, u8 *known_gid) 1193 { 1194 struct smc_init_info *alt_ini = NULL; 1195 1196 memset(gidlist, 0, sizeof(*gidlist)); 1197 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 1198 1199 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 1200 if (!alt_ini) 1201 goto out; 1202 1203 alt_ini->vlan_id = lgr->vlan_id; 1204 alt_ini->check_smcrv2 = true; 1205 alt_ini->smcrv2.saddr = lgr->saddr; 1206 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 1207 1208 if (!alt_ini->smcrv2.ib_dev_v2) 1209 goto out; 1210 1211 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 1212 SMC_GID_SIZE); 1213 1214 out: 1215 kfree(alt_ini); 1216 } 1217 1218 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 1219 struct smc_clc_msg_accept_confirm *aclc, 1220 struct smc_init_info *ini) 1221 { 1222 struct smc_clc_first_contact_ext *fce = 1223 smc_get_clc_first_contact_ext(aclc, false); 1224 struct net *net = sock_net(&smc->sk); 1225 int rc; 1226 1227 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 1228 return 0; 1229 1230 if (fce->v2_direct) { 1231 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 1232 ini->smcrv2.uses_gateway = false; 1233 } else { 1234 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr, 1235 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 1236 ini->smcrv2.nexthop_mac, 1237 &ini->smcrv2.uses_gateway)) 1238 return SMC_CLC_DECL_NOROUTE; 1239 if (!ini->smcrv2.uses_gateway) { 1240 /* mismatch: peer claims indirect, but its direct */ 1241 return SMC_CLC_DECL_NOINDIRECT; 1242 } 1243 } 1244 1245 ini->release_nr = fce->release; 1246 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1247 if (rc) 1248 return rc; 1249 1250 return 0; 1251 } 1252 1253 /* setup for RDMA connection of client */ 1254 static int smc_connect_rdma(struct smc_sock *smc, 1255 struct smc_clc_msg_accept_confirm *aclc, 1256 struct smc_init_info *ini) 1257 { 1258 int i, reason_code = 0; 1259 struct smc_link *link; 1260 u8 *eid = NULL; 1261 1262 ini->is_smcd = false; 1263 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 1264 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1265 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 1266 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 1267 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 1268 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1269 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1270 1271 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 1272 if (reason_code) 1273 return reason_code; 1274 1275 mutex_lock(&smc_client_lgr_pending); 1276 reason_code = smc_conn_create(smc, ini); 1277 if (reason_code) { 1278 mutex_unlock(&smc_client_lgr_pending); 1279 return reason_code; 1280 } 1281 1282 smc_conn_save_peer_info(smc, aclc); 1283 1284 if (ini->first_contact_local) { 1285 link = smc->conn.lnk; 1286 } else { 1287 /* set link that was assigned by server */ 1288 link = NULL; 1289 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1290 struct smc_link *l = &smc->conn.lgr->lnk[i]; 1291 1292 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 1293 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 1294 SMC_GID_SIZE) && 1295 (aclc->hdr.version > SMC_V1 || 1296 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 1297 sizeof(l->peer_mac)))) { 1298 link = l; 1299 break; 1300 } 1301 } 1302 if (!link) { 1303 reason_code = SMC_CLC_DECL_NOSRVLINK; 1304 goto connect_abort; 1305 } 1306 smc_switch_link_and_count(&smc->conn, link); 1307 } 1308 1309 /* create send buffer and rmb */ 1310 if (smc_buf_create(smc, false)) { 1311 reason_code = SMC_CLC_DECL_MEM; 1312 goto connect_abort; 1313 } 1314 1315 if (ini->first_contact_local) 1316 smc_link_save_peer_info(link, aclc, ini); 1317 1318 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 1319 reason_code = SMC_CLC_DECL_ERR_RTOK; 1320 goto connect_abort; 1321 } 1322 1323 smc_rx_init(smc); 1324 1325 if (ini->first_contact_local) { 1326 if (smc_ib_ready_link(link)) { 1327 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1328 goto connect_abort; 1329 } 1330 } else { 1331 /* reg sendbufs if they were vzalloced */ 1332 if (smc->conn.sndbuf_desc->is_vm) { 1333 if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) { 1334 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1335 goto connect_abort; 1336 } 1337 } 1338 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 1339 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1340 goto connect_abort; 1341 } 1342 } 1343 1344 if (aclc->hdr.version > SMC_V1) { 1345 eid = aclc->r1.eid; 1346 if (ini->first_contact_local) 1347 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 1348 link->smcibdev, link->gid); 1349 } 1350 1351 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 1352 aclc->hdr.version, eid, ini); 1353 if (reason_code) 1354 goto connect_abort; 1355 1356 smc_tx_init(smc); 1357 1358 if (ini->first_contact_local) { 1359 /* QP confirmation over RoCE fabric */ 1360 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1361 reason_code = smcr_clnt_conf_first_link(smc); 1362 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1363 if (reason_code) 1364 goto connect_abort; 1365 } 1366 mutex_unlock(&smc_client_lgr_pending); 1367 1368 smc_copy_sock_settings_to_clc(smc); 1369 smc->connect_nonblock = 0; 1370 if (smc->sk.sk_state == SMC_INIT) 1371 smc->sk.sk_state = SMC_ACTIVE; 1372 1373 return 0; 1374 connect_abort: 1375 smc_conn_abort(smc, ini->first_contact_local); 1376 mutex_unlock(&smc_client_lgr_pending); 1377 smc->connect_nonblock = 0; 1378 1379 return reason_code; 1380 } 1381 1382 /* The server has chosen one of the proposed ISM devices for the communication. 1383 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1384 */ 1385 static int 1386 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm *aclc, 1387 struct smc_init_info *ini) 1388 { 1389 int i; 1390 1391 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1392 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1393 ini->ism_selected = i; 1394 return 0; 1395 } 1396 } 1397 1398 return -EPROTO; 1399 } 1400 1401 /* setup for ISM connection of client */ 1402 static int smc_connect_ism(struct smc_sock *smc, 1403 struct smc_clc_msg_accept_confirm *aclc, 1404 struct smc_init_info *ini) 1405 { 1406 u8 *eid = NULL; 1407 int rc = 0; 1408 1409 ini->is_smcd = true; 1410 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1411 1412 if (aclc->hdr.version == SMC_V2) { 1413 if (ini->first_contact_peer) { 1414 struct smc_clc_first_contact_ext *fce = 1415 smc_get_clc_first_contact_ext(aclc, true); 1416 1417 ini->release_nr = fce->release; 1418 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1419 if (rc) 1420 return rc; 1421 } 1422 1423 rc = smc_v2_determine_accepted_chid(aclc, ini); 1424 if (rc) 1425 return rc; 1426 1427 if (__smc_ism_is_emulated(ini->ism_chid[ini->ism_selected])) 1428 ini->ism_peer_gid[ini->ism_selected].gid_ext = 1429 ntohll(aclc->d1.gid_ext); 1430 /* for non-Emulated-ISM devices, peer gid_ext remains 0. */ 1431 } 1432 ini->ism_peer_gid[ini->ism_selected].gid = ntohll(aclc->d0.gid); 1433 1434 /* there is only one lgr role for SMC-D; use server lock */ 1435 mutex_lock(&smc_server_lgr_pending); 1436 rc = smc_conn_create(smc, ini); 1437 if (rc) { 1438 mutex_unlock(&smc_server_lgr_pending); 1439 return rc; 1440 } 1441 1442 /* Create send and receive buffers */ 1443 rc = smc_buf_create(smc, true); 1444 if (rc) { 1445 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1446 goto connect_abort; 1447 } 1448 1449 smc_conn_save_peer_info(smc, aclc); 1450 1451 if (smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) { 1452 rc = smcd_buf_attach(smc); 1453 if (rc) { 1454 rc = SMC_CLC_DECL_MEM; /* try to fallback */ 1455 goto connect_abort; 1456 } 1457 } 1458 smc_rx_init(smc); 1459 smc_tx_init(smc); 1460 1461 if (aclc->hdr.version > SMC_V1) 1462 eid = aclc->d1.eid; 1463 1464 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1465 aclc->hdr.version, eid, ini); 1466 if (rc) 1467 goto connect_abort; 1468 mutex_unlock(&smc_server_lgr_pending); 1469 1470 smc_copy_sock_settings_to_clc(smc); 1471 smc->connect_nonblock = 0; 1472 if (smc->sk.sk_state == SMC_INIT) 1473 smc->sk.sk_state = SMC_ACTIVE; 1474 1475 return 0; 1476 connect_abort: 1477 smc_conn_abort(smc, ini->first_contact_local); 1478 mutex_unlock(&smc_server_lgr_pending); 1479 smc->connect_nonblock = 0; 1480 1481 return rc; 1482 } 1483 1484 /* check if received accept type and version matches a proposed one */ 1485 static int smc_connect_check_aclc(struct smc_init_info *ini, 1486 struct smc_clc_msg_accept_confirm *aclc) 1487 { 1488 if (aclc->hdr.version >= SMC_V2) { 1489 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1490 !smcr_indicated(ini->smc_type_v2)) || 1491 (aclc->hdr.typev1 == SMC_TYPE_D && 1492 !smcd_indicated(ini->smc_type_v2))) 1493 return SMC_CLC_DECL_MODEUNSUPP; 1494 } else { 1495 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1496 !smcr_indicated(ini->smc_type_v1)) || 1497 (aclc->hdr.typev1 == SMC_TYPE_D && 1498 !smcd_indicated(ini->smc_type_v1))) 1499 return SMC_CLC_DECL_MODEUNSUPP; 1500 } 1501 1502 return 0; 1503 } 1504 1505 /* perform steps before actually connecting */ 1506 static int __smc_connect(struct smc_sock *smc) 1507 { 1508 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1509 struct smc_clc_msg_accept_confirm *aclc; 1510 struct smc_init_info *ini = NULL; 1511 u8 *buf = NULL; 1512 int rc = 0; 1513 1514 if (smc->use_fallback) 1515 return smc_connect_fallback(smc, smc->fallback_rsn); 1516 1517 /* if peer has not signalled SMC-capability, fall back */ 1518 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1519 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1520 1521 /* IPSec connections opt out of SMC optimizations */ 1522 if (using_ipsec(smc)) 1523 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1524 version); 1525 1526 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1527 if (!ini) 1528 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1529 version); 1530 1531 ini->smcd_version = SMC_V1 | SMC_V2; 1532 ini->smcr_version = SMC_V1 | SMC_V2; 1533 ini->smc_type_v1 = SMC_TYPE_B; 1534 ini->smc_type_v2 = SMC_TYPE_B; 1535 1536 /* get vlan id from IP device */ 1537 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1538 ini->smcd_version &= ~SMC_V1; 1539 ini->smcr_version = 0; 1540 ini->smc_type_v1 = SMC_TYPE_N; 1541 } 1542 1543 rc = smc_find_proposal_devices(smc, ini); 1544 if (rc) 1545 goto fallback; 1546 1547 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1548 if (!buf) { 1549 rc = SMC_CLC_DECL_MEM; 1550 goto fallback; 1551 } 1552 aclc = (struct smc_clc_msg_accept_confirm *)buf; 1553 1554 /* perform CLC handshake */ 1555 rc = smc_connect_clc(smc, aclc, ini); 1556 if (rc) { 1557 /* -EAGAIN on timeout, see tcp_recvmsg() */ 1558 if (rc == -EAGAIN) { 1559 rc = -ETIMEDOUT; 1560 smc->sk.sk_err = ETIMEDOUT; 1561 } 1562 goto vlan_cleanup; 1563 } 1564 1565 /* check if smc modes and versions of CLC proposal and accept match */ 1566 rc = smc_connect_check_aclc(ini, aclc); 1567 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1568 if (rc) 1569 goto vlan_cleanup; 1570 1571 /* depending on previous steps, connect using rdma or ism */ 1572 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1573 ini->smcr_version = version; 1574 rc = smc_connect_rdma(smc, aclc, ini); 1575 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1576 ini->smcd_version = version; 1577 rc = smc_connect_ism(smc, aclc, ini); 1578 } 1579 if (rc) 1580 goto vlan_cleanup; 1581 1582 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1583 smc_connect_ism_vlan_cleanup(ini); 1584 kfree(buf); 1585 kfree(ini); 1586 return 0; 1587 1588 vlan_cleanup: 1589 smc_connect_ism_vlan_cleanup(ini); 1590 kfree(buf); 1591 fallback: 1592 kfree(ini); 1593 return smc_connect_decline_fallback(smc, rc, version); 1594 } 1595 1596 static void smc_connect_work(struct work_struct *work) 1597 { 1598 struct smc_sock *smc = container_of(work, struct smc_sock, 1599 connect_work); 1600 long timeo = READ_ONCE(smc->sk.sk_sndtimeo); 1601 int rc = 0; 1602 1603 if (!timeo) 1604 timeo = MAX_SCHEDULE_TIMEOUT; 1605 lock_sock(smc->clcsock->sk); 1606 if (smc->clcsock->sk->sk_err) { 1607 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1608 } else if ((1 << smc->clcsock->sk->sk_state) & 1609 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1610 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1611 if ((rc == -EPIPE) && 1612 ((1 << smc->clcsock->sk->sk_state) & 1613 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1614 rc = 0; 1615 } 1616 release_sock(smc->clcsock->sk); 1617 lock_sock(&smc->sk); 1618 if (rc != 0 || smc->sk.sk_err) { 1619 smc->sk.sk_state = SMC_CLOSED; 1620 if (rc == -EPIPE || rc == -EAGAIN) 1621 smc->sk.sk_err = EPIPE; 1622 else if (rc == -ECONNREFUSED) 1623 smc->sk.sk_err = ECONNREFUSED; 1624 else if (signal_pending(current)) 1625 smc->sk.sk_err = -sock_intr_errno(timeo); 1626 sock_put(&smc->sk); /* passive closing */ 1627 goto out; 1628 } 1629 1630 rc = __smc_connect(smc); 1631 if (rc < 0) 1632 smc->sk.sk_err = -rc; 1633 1634 out: 1635 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1636 if (smc->sk.sk_err) { 1637 smc->sk.sk_state_change(&smc->sk); 1638 } else { /* allow polling before and after fallback decision */ 1639 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1640 smc->sk.sk_write_space(&smc->sk); 1641 } 1642 } 1643 release_sock(&smc->sk); 1644 } 1645 1646 int smc_connect(struct socket *sock, struct sockaddr *addr, 1647 int alen, int flags) 1648 { 1649 struct sock *sk = sock->sk; 1650 struct smc_sock *smc; 1651 int rc = -EINVAL; 1652 1653 smc = smc_sk(sk); 1654 1655 /* separate smc parameter checking to be safe */ 1656 if (alen < sizeof(addr->sa_family)) 1657 goto out_err; 1658 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1659 goto out_err; 1660 1661 lock_sock(sk); 1662 switch (sock->state) { 1663 default: 1664 rc = -EINVAL; 1665 goto out; 1666 case SS_CONNECTED: 1667 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL; 1668 goto out; 1669 case SS_CONNECTING: 1670 if (sk->sk_state == SMC_ACTIVE) 1671 goto connected; 1672 break; 1673 case SS_UNCONNECTED: 1674 sock->state = SS_CONNECTING; 1675 break; 1676 } 1677 1678 switch (sk->sk_state) { 1679 default: 1680 goto out; 1681 case SMC_CLOSED: 1682 rc = sock_error(sk) ? : -ECONNABORTED; 1683 sock->state = SS_UNCONNECTED; 1684 goto out; 1685 case SMC_ACTIVE: 1686 rc = -EISCONN; 1687 goto out; 1688 case SMC_INIT: 1689 break; 1690 } 1691 1692 smc_copy_sock_settings_to_clc(smc); 1693 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1694 if (smc->connect_nonblock) { 1695 rc = -EALREADY; 1696 goto out; 1697 } 1698 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1699 if (rc && rc != -EINPROGRESS) 1700 goto out; 1701 1702 if (smc->use_fallback) { 1703 sock->state = rc ? SS_CONNECTING : SS_CONNECTED; 1704 goto out; 1705 } 1706 sock_hold(&smc->sk); /* sock put in passive closing */ 1707 if (flags & O_NONBLOCK) { 1708 if (queue_work(smc_hs_wq, &smc->connect_work)) 1709 smc->connect_nonblock = 1; 1710 rc = -EINPROGRESS; 1711 goto out; 1712 } else { 1713 rc = __smc_connect(smc); 1714 if (rc < 0) 1715 goto out; 1716 } 1717 1718 connected: 1719 rc = 0; 1720 sock->state = SS_CONNECTED; 1721 out: 1722 release_sock(sk); 1723 out_err: 1724 return rc; 1725 } 1726 1727 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1728 { 1729 struct socket *new_clcsock = NULL; 1730 struct sock *lsk = &lsmc->sk; 1731 struct sock *new_sk; 1732 int rc = -EINVAL; 1733 1734 release_sock(lsk); 1735 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1736 if (!new_sk) { 1737 rc = -ENOMEM; 1738 lsk->sk_err = ENOMEM; 1739 *new_smc = NULL; 1740 lock_sock(lsk); 1741 goto out; 1742 } 1743 *new_smc = smc_sk(new_sk); 1744 1745 mutex_lock(&lsmc->clcsock_release_lock); 1746 if (lsmc->clcsock) 1747 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1748 mutex_unlock(&lsmc->clcsock_release_lock); 1749 lock_sock(lsk); 1750 if (rc < 0 && rc != -EAGAIN) 1751 lsk->sk_err = -rc; 1752 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1753 new_sk->sk_prot->unhash(new_sk); 1754 if (new_clcsock) 1755 sock_release(new_clcsock); 1756 new_sk->sk_state = SMC_CLOSED; 1757 smc_sock_set_flag(new_sk, SOCK_DEAD); 1758 sock_put(new_sk); /* final */ 1759 *new_smc = NULL; 1760 goto out; 1761 } 1762 1763 /* new clcsock has inherited the smc listen-specific sk_data_ready 1764 * function; switch it back to the original sk_data_ready function 1765 */ 1766 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1767 1768 /* if new clcsock has also inherited the fallback-specific callback 1769 * functions, switch them back to the original ones. 1770 */ 1771 if (lsmc->use_fallback) { 1772 if (lsmc->clcsk_state_change) 1773 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change; 1774 if (lsmc->clcsk_write_space) 1775 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space; 1776 if (lsmc->clcsk_error_report) 1777 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report; 1778 } 1779 1780 (*new_smc)->clcsock = new_clcsock; 1781 out: 1782 return rc; 1783 } 1784 1785 /* add a just created sock to the accept queue of the listen sock as 1786 * candidate for a following socket accept call from user space 1787 */ 1788 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1789 { 1790 struct smc_sock *par = smc_sk(parent); 1791 1792 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1793 spin_lock(&par->accept_q_lock); 1794 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1795 spin_unlock(&par->accept_q_lock); 1796 sk_acceptq_added(parent); 1797 } 1798 1799 /* remove a socket from the accept queue of its parental listening socket */ 1800 static void smc_accept_unlink(struct sock *sk) 1801 { 1802 struct smc_sock *par = smc_sk(sk)->listen_smc; 1803 1804 spin_lock(&par->accept_q_lock); 1805 list_del_init(&smc_sk(sk)->accept_q); 1806 spin_unlock(&par->accept_q_lock); 1807 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1808 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1809 } 1810 1811 /* remove a sock from the accept queue to bind it to a new socket created 1812 * for a socket accept call from user space 1813 */ 1814 struct sock *smc_accept_dequeue(struct sock *parent, 1815 struct socket *new_sock) 1816 { 1817 struct smc_sock *isk, *n; 1818 struct sock *new_sk; 1819 1820 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1821 new_sk = (struct sock *)isk; 1822 1823 smc_accept_unlink(new_sk); 1824 if (new_sk->sk_state == SMC_CLOSED) { 1825 new_sk->sk_prot->unhash(new_sk); 1826 if (isk->clcsock) { 1827 sock_release(isk->clcsock); 1828 isk->clcsock = NULL; 1829 } 1830 sock_put(new_sk); /* final */ 1831 continue; 1832 } 1833 if (new_sock) { 1834 sock_graft(new_sk, new_sock); 1835 new_sock->state = SS_CONNECTED; 1836 if (isk->use_fallback) { 1837 smc_sk(new_sk)->clcsock->file = new_sock->file; 1838 isk->clcsock->file->private_data = isk->clcsock; 1839 } 1840 } 1841 return new_sk; 1842 } 1843 return NULL; 1844 } 1845 1846 /* clean up for a created but never accepted sock */ 1847 void smc_close_non_accepted(struct sock *sk) 1848 { 1849 struct smc_sock *smc = smc_sk(sk); 1850 1851 sock_hold(sk); /* sock_put below */ 1852 lock_sock(sk); 1853 if (!sk->sk_lingertime) 1854 /* wait for peer closing */ 1855 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT); 1856 __smc_release(smc); 1857 release_sock(sk); 1858 sock_put(sk); /* sock_hold above */ 1859 sock_put(sk); /* final sock_put */ 1860 } 1861 1862 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1863 { 1864 struct smc_link *link = smc->conn.lnk; 1865 struct smc_llc_qentry *qentry; 1866 int rc; 1867 1868 /* reg the sndbuf if it was vzalloced*/ 1869 if (smc->conn.sndbuf_desc->is_vm) { 1870 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) 1871 return SMC_CLC_DECL_ERR_REGBUF; 1872 } 1873 1874 /* reg the rmb */ 1875 if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) 1876 return SMC_CLC_DECL_ERR_REGBUF; 1877 1878 /* send CONFIRM LINK request to client over the RoCE fabric */ 1879 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1880 if (rc < 0) 1881 return SMC_CLC_DECL_TIMEOUT_CL; 1882 1883 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1884 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1885 SMC_LLC_CONFIRM_LINK); 1886 if (!qentry) { 1887 struct smc_clc_msg_decline dclc; 1888 1889 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1890 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1891 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1892 } 1893 smc_llc_save_peer_uid(qentry); 1894 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1895 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1896 if (rc) 1897 return SMC_CLC_DECL_RMBE_EC; 1898 1899 /* confirm_rkey is implicit on 1st contact */ 1900 smc->conn.rmb_desc->is_conf_rkey = true; 1901 1902 smc_llc_link_active(link); 1903 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1904 1905 if (link->lgr->max_links > 1) { 1906 down_write(&link->lgr->llc_conf_mutex); 1907 /* initial contact - try to establish second link */ 1908 smc_llc_srv_add_link(link, NULL); 1909 up_write(&link->lgr->llc_conf_mutex); 1910 } 1911 return 0; 1912 } 1913 1914 /* listen worker: finish */ 1915 static void smc_listen_out(struct smc_sock *new_smc) 1916 { 1917 struct smc_sock *lsmc = new_smc->listen_smc; 1918 struct sock *newsmcsk = &new_smc->sk; 1919 1920 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 1921 atomic_dec(&lsmc->queued_smc_hs); 1922 1923 release_sock(newsmcsk); /* lock in smc_listen_work() */ 1924 if (lsmc->sk.sk_state == SMC_LISTEN) { 1925 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1926 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1927 release_sock(&lsmc->sk); 1928 } else { /* no longer listening */ 1929 smc_close_non_accepted(newsmcsk); 1930 } 1931 1932 /* Wake up accept */ 1933 lsmc->sk.sk_data_ready(&lsmc->sk); 1934 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1935 } 1936 1937 /* listen worker: finish in state connected */ 1938 static void smc_listen_out_connected(struct smc_sock *new_smc) 1939 { 1940 struct sock *newsmcsk = &new_smc->sk; 1941 1942 if (newsmcsk->sk_state == SMC_INIT) 1943 newsmcsk->sk_state = SMC_ACTIVE; 1944 1945 smc_listen_out(new_smc); 1946 } 1947 1948 /* listen worker: finish in error state */ 1949 static void smc_listen_out_err(struct smc_sock *new_smc) 1950 { 1951 struct sock *newsmcsk = &new_smc->sk; 1952 struct net *net = sock_net(newsmcsk); 1953 1954 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1955 if (newsmcsk->sk_state == SMC_INIT) 1956 sock_put(&new_smc->sk); /* passive closing */ 1957 newsmcsk->sk_state = SMC_CLOSED; 1958 1959 smc_listen_out(new_smc); 1960 } 1961 1962 /* listen worker: decline and fall back if possible */ 1963 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1964 int local_first, u8 version) 1965 { 1966 /* RDMA setup failed, switch back to TCP */ 1967 smc_conn_abort(new_smc, local_first); 1968 if (reason_code < 0 || 1969 smc_switch_to_fallback(new_smc, reason_code)) { 1970 /* error, no fallback possible */ 1971 smc_listen_out_err(new_smc); 1972 return; 1973 } 1974 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1975 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1976 smc_listen_out_err(new_smc); 1977 return; 1978 } 1979 } 1980 smc_listen_out_connected(new_smc); 1981 } 1982 1983 /* listen worker: version checking */ 1984 static int smc_listen_v2_check(struct smc_sock *new_smc, 1985 struct smc_clc_msg_proposal *pclc, 1986 struct smc_init_info *ini) 1987 { 1988 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1989 struct smc_clc_v2_extension *pclc_v2_ext; 1990 int rc = SMC_CLC_DECL_PEERNOSMC; 1991 1992 ini->smc_type_v1 = pclc->hdr.typev1; 1993 ini->smc_type_v2 = pclc->hdr.typev2; 1994 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1995 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1996 if (pclc->hdr.version > SMC_V1) { 1997 if (smcd_indicated(ini->smc_type_v2)) 1998 ini->smcd_version |= SMC_V2; 1999 if (smcr_indicated(ini->smc_type_v2)) 2000 ini->smcr_version |= SMC_V2; 2001 } 2002 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 2003 rc = SMC_CLC_DECL_PEERNOSMC; 2004 goto out; 2005 } 2006 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 2007 if (!pclc_v2_ext) { 2008 ini->smcd_version &= ~SMC_V2; 2009 ini->smcr_version &= ~SMC_V2; 2010 rc = SMC_CLC_DECL_NOV2EXT; 2011 goto out; 2012 } 2013 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 2014 if (ini->smcd_version & SMC_V2) { 2015 if (!smc_ism_is_v2_capable()) { 2016 ini->smcd_version &= ~SMC_V2; 2017 rc = SMC_CLC_DECL_NOISM2SUPP; 2018 } else if (!pclc_smcd_v2_ext) { 2019 ini->smcd_version &= ~SMC_V2; 2020 rc = SMC_CLC_DECL_NOV2DEXT; 2021 } else if (!pclc_v2_ext->hdr.eid_cnt && 2022 !pclc_v2_ext->hdr.flag.seid) { 2023 ini->smcd_version &= ~SMC_V2; 2024 rc = SMC_CLC_DECL_NOUEID; 2025 } 2026 } 2027 if (ini->smcr_version & SMC_V2) { 2028 if (!pclc_v2_ext->hdr.eid_cnt) { 2029 ini->smcr_version &= ~SMC_V2; 2030 rc = SMC_CLC_DECL_NOUEID; 2031 } 2032 } 2033 2034 ini->release_nr = pclc_v2_ext->hdr.flag.release; 2035 if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE) 2036 ini->release_nr = SMC_RELEASE; 2037 2038 out: 2039 if (!ini->smcd_version && !ini->smcr_version) 2040 return rc; 2041 2042 return 0; 2043 } 2044 2045 /* listen worker: check prefixes */ 2046 static int smc_listen_prfx_check(struct smc_sock *new_smc, 2047 struct smc_clc_msg_proposal *pclc) 2048 { 2049 struct smc_clc_msg_proposal_prefix *pclc_prfx; 2050 struct socket *newclcsock = new_smc->clcsock; 2051 2052 if (pclc->hdr.typev1 == SMC_TYPE_N) 2053 return 0; 2054 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 2055 if (!pclc_prfx) 2056 return -EPROTO; 2057 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 2058 return SMC_CLC_DECL_DIFFPREFIX; 2059 2060 return 0; 2061 } 2062 2063 /* listen worker: initialize connection and buffers */ 2064 static int smc_listen_rdma_init(struct smc_sock *new_smc, 2065 struct smc_init_info *ini) 2066 { 2067 int rc; 2068 2069 /* allocate connection / link group */ 2070 rc = smc_conn_create(new_smc, ini); 2071 if (rc) 2072 return rc; 2073 2074 /* create send buffer and rmb */ 2075 if (smc_buf_create(new_smc, false)) { 2076 smc_conn_abort(new_smc, ini->first_contact_local); 2077 return SMC_CLC_DECL_MEM; 2078 } 2079 2080 return 0; 2081 } 2082 2083 /* listen worker: initialize connection and buffers for SMC-D */ 2084 static int smc_listen_ism_init(struct smc_sock *new_smc, 2085 struct smc_init_info *ini) 2086 { 2087 int rc; 2088 2089 rc = smc_conn_create(new_smc, ini); 2090 if (rc) 2091 return rc; 2092 2093 /* Create send and receive buffers */ 2094 rc = smc_buf_create(new_smc, true); 2095 if (rc) { 2096 smc_conn_abort(new_smc, ini->first_contact_local); 2097 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 2098 SMC_CLC_DECL_MEM; 2099 } 2100 2101 return 0; 2102 } 2103 2104 static bool smc_is_already_selected(struct smcd_dev *smcd, 2105 struct smc_init_info *ini, 2106 int matches) 2107 { 2108 int i; 2109 2110 for (i = 0; i < matches; i++) 2111 if (smcd == ini->ism_dev[i]) 2112 return true; 2113 2114 return false; 2115 } 2116 2117 /* check for ISM devices matching proposed ISM devices */ 2118 static void smc_check_ism_v2_match(struct smc_init_info *ini, 2119 u16 proposed_chid, 2120 struct smcd_gid *proposed_gid, 2121 unsigned int *matches) 2122 { 2123 struct smcd_dev *smcd; 2124 2125 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2126 if (smcd->going_away) 2127 continue; 2128 if (smc_is_already_selected(smcd, ini, *matches)) 2129 continue; 2130 if (smc_ism_get_chid(smcd) == proposed_chid && 2131 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 2132 ini->ism_peer_gid[*matches].gid = proposed_gid->gid; 2133 if (__smc_ism_is_emulated(proposed_chid)) 2134 ini->ism_peer_gid[*matches].gid_ext = 2135 proposed_gid->gid_ext; 2136 /* non-Emulated-ISM's peer gid_ext remains 0. */ 2137 ini->ism_dev[*matches] = smcd; 2138 (*matches)++; 2139 break; 2140 } 2141 } 2142 } 2143 2144 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 2145 { 2146 if (!ini->rc) 2147 ini->rc = rc; 2148 } 2149 2150 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 2151 struct smc_clc_msg_proposal *pclc, 2152 struct smc_init_info *ini) 2153 { 2154 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 2155 struct smc_clc_v2_extension *smc_v2_ext; 2156 struct smc_clc_msg_smcd *pclc_smcd; 2157 unsigned int matches = 0; 2158 struct smcd_gid smcd_gid; 2159 u8 smcd_version; 2160 u8 *eid = NULL; 2161 int i, rc; 2162 u16 chid; 2163 2164 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 2165 goto not_found; 2166 2167 pclc_smcd = smc_get_clc_msg_smcd(pclc); 2168 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2169 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 2170 if (!pclc_smcd || !smc_v2_ext || !smcd_v2_ext) 2171 goto not_found; 2172 2173 mutex_lock(&smcd_dev_list.mutex); 2174 if (pclc_smcd->ism.chid) { 2175 /* check for ISM device matching proposed native ISM device */ 2176 smcd_gid.gid = ntohll(pclc_smcd->ism.gid); 2177 smcd_gid.gid_ext = 0; 2178 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 2179 &smcd_gid, &matches); 2180 } 2181 for (i = 0; i < smc_v2_ext->hdr.ism_gid_cnt; i++) { 2182 /* check for ISM devices matching proposed non-native ISM 2183 * devices 2184 */ 2185 smcd_gid.gid = ntohll(smcd_v2_ext->gidchid[i].gid); 2186 smcd_gid.gid_ext = 0; 2187 chid = ntohs(smcd_v2_ext->gidchid[i].chid); 2188 if (__smc_ism_is_emulated(chid)) { 2189 if ((i + 1) == smc_v2_ext->hdr.ism_gid_cnt || 2190 chid != ntohs(smcd_v2_ext->gidchid[i + 1].chid)) 2191 /* each Emulated-ISM device takes two GID-CHID 2192 * entries and CHID of the second entry repeats 2193 * that of the first entry. 2194 * 2195 * So check if the next GID-CHID entry exists 2196 * and both two entries' CHIDs are the same. 2197 */ 2198 continue; 2199 smcd_gid.gid_ext = 2200 ntohll(smcd_v2_ext->gidchid[++i].gid); 2201 } 2202 smc_check_ism_v2_match(ini, chid, &smcd_gid, &matches); 2203 } 2204 mutex_unlock(&smcd_dev_list.mutex); 2205 2206 if (!ini->ism_dev[0]) { 2207 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 2208 goto not_found; 2209 } 2210 2211 smc_ism_get_system_eid(&eid); 2212 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 2213 smcd_v2_ext->system_eid, eid)) 2214 goto not_found; 2215 2216 /* separate - outside the smcd_dev_list.lock */ 2217 smcd_version = ini->smcd_version; 2218 for (i = 0; i < matches; i++) { 2219 ini->smcd_version = SMC_V2; 2220 ini->is_smcd = true; 2221 ini->ism_selected = i; 2222 rc = smc_listen_ism_init(new_smc, ini); 2223 if (rc) { 2224 smc_find_ism_store_rc(rc, ini); 2225 /* try next active ISM device */ 2226 continue; 2227 } 2228 return; /* matching and usable V2 ISM device found */ 2229 } 2230 /* no V2 ISM device could be initialized */ 2231 ini->smcd_version = smcd_version; /* restore original value */ 2232 ini->negotiated_eid[0] = 0; 2233 2234 not_found: 2235 ini->smcd_version &= ~SMC_V2; 2236 ini->ism_dev[0] = NULL; 2237 ini->is_smcd = false; 2238 } 2239 2240 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 2241 struct smc_clc_msg_proposal *pclc, 2242 struct smc_init_info *ini) 2243 { 2244 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 2245 int rc = 0; 2246 2247 /* check if ISM V1 is available */ 2248 if (!(ini->smcd_version & SMC_V1) || 2249 !smcd_indicated(ini->smc_type_v1) || 2250 !pclc_smcd) 2251 goto not_found; 2252 ini->is_smcd = true; /* prepare ISM check */ 2253 ini->ism_peer_gid[0].gid = ntohll(pclc_smcd->ism.gid); 2254 ini->ism_peer_gid[0].gid_ext = 0; 2255 rc = smc_find_ism_device(new_smc, ini); 2256 if (rc) 2257 goto not_found; 2258 ini->ism_selected = 0; 2259 rc = smc_listen_ism_init(new_smc, ini); 2260 if (!rc) 2261 return; /* V1 ISM device found */ 2262 2263 not_found: 2264 smc_find_ism_store_rc(rc, ini); 2265 ini->smcd_version &= ~SMC_V1; 2266 ini->ism_dev[0] = NULL; 2267 ini->is_smcd = false; 2268 } 2269 2270 /* listen worker: register buffers */ 2271 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 2272 { 2273 struct smc_connection *conn = &new_smc->conn; 2274 2275 if (!local_first) { 2276 /* reg sendbufs if they were vzalloced */ 2277 if (conn->sndbuf_desc->is_vm) { 2278 if (smcr_lgr_reg_sndbufs(conn->lnk, 2279 conn->sndbuf_desc)) 2280 return SMC_CLC_DECL_ERR_REGBUF; 2281 } 2282 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 2283 return SMC_CLC_DECL_ERR_REGBUF; 2284 } 2285 2286 return 0; 2287 } 2288 2289 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 2290 struct smc_clc_msg_proposal *pclc, 2291 struct smc_init_info *ini) 2292 { 2293 struct smc_clc_v2_extension *smc_v2_ext; 2294 u8 smcr_version; 2295 int rc; 2296 2297 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 2298 goto not_found; 2299 2300 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2301 if (!smc_v2_ext || 2302 !smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 2303 goto not_found; 2304 2305 /* prepare RDMA check */ 2306 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2307 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 2308 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2309 ini->check_smcrv2 = true; 2310 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 2311 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 2312 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 2313 rc = smc_find_rdma_device(new_smc, ini); 2314 if (rc) { 2315 smc_find_ism_store_rc(rc, ini); 2316 goto not_found; 2317 } 2318 if (!ini->smcrv2.uses_gateway) 2319 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 2320 2321 smcr_version = ini->smcr_version; 2322 ini->smcr_version = SMC_V2; 2323 rc = smc_listen_rdma_init(new_smc, ini); 2324 if (!rc) { 2325 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2326 if (rc) 2327 smc_conn_abort(new_smc, ini->first_contact_local); 2328 } 2329 if (!rc) 2330 return; 2331 ini->smcr_version = smcr_version; 2332 smc_find_ism_store_rc(rc, ini); 2333 2334 not_found: 2335 ini->smcr_version &= ~SMC_V2; 2336 ini->smcrv2.ib_dev_v2 = NULL; 2337 ini->check_smcrv2 = false; 2338 } 2339 2340 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 2341 struct smc_clc_msg_proposal *pclc, 2342 struct smc_init_info *ini) 2343 { 2344 int rc; 2345 2346 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 2347 return SMC_CLC_DECL_NOSMCDEV; 2348 2349 /* prepare RDMA check */ 2350 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2351 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 2352 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2353 rc = smc_find_rdma_device(new_smc, ini); 2354 if (rc) { 2355 /* no RDMA device found */ 2356 return SMC_CLC_DECL_NOSMCDEV; 2357 } 2358 rc = smc_listen_rdma_init(new_smc, ini); 2359 if (rc) 2360 return rc; 2361 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2362 } 2363 2364 /* determine the local device matching to proposal */ 2365 static int smc_listen_find_device(struct smc_sock *new_smc, 2366 struct smc_clc_msg_proposal *pclc, 2367 struct smc_init_info *ini) 2368 { 2369 int prfx_rc; 2370 2371 /* check for ISM device matching V2 proposed device */ 2372 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 2373 if (ini->ism_dev[0]) 2374 return 0; 2375 2376 /* check for matching IP prefix and subnet length (V1) */ 2377 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 2378 if (prfx_rc) 2379 smc_find_ism_store_rc(prfx_rc, ini); 2380 2381 /* get vlan id from IP device */ 2382 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 2383 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 2384 2385 /* check for ISM device matching V1 proposed device */ 2386 if (!prfx_rc) 2387 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 2388 if (ini->ism_dev[0]) 2389 return 0; 2390 2391 if (!smcr_indicated(pclc->hdr.typev1) && 2392 !smcr_indicated(pclc->hdr.typev2)) 2393 /* skip RDMA and decline */ 2394 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 2395 2396 /* check if RDMA V2 is available */ 2397 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 2398 if (ini->smcrv2.ib_dev_v2) 2399 return 0; 2400 2401 /* check if RDMA V1 is available */ 2402 if (!prfx_rc) { 2403 int rc; 2404 2405 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 2406 smc_find_ism_store_rc(rc, ini); 2407 return (!rc) ? 0 : ini->rc; 2408 } 2409 return prfx_rc; 2410 } 2411 2412 /* listen worker: finish RDMA setup */ 2413 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 2414 struct smc_clc_msg_accept_confirm *cclc, 2415 bool local_first, 2416 struct smc_init_info *ini) 2417 { 2418 struct smc_link *link = new_smc->conn.lnk; 2419 int reason_code = 0; 2420 2421 if (local_first) 2422 smc_link_save_peer_info(link, cclc, ini); 2423 2424 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 2425 return SMC_CLC_DECL_ERR_RTOK; 2426 2427 if (local_first) { 2428 if (smc_ib_ready_link(link)) 2429 return SMC_CLC_DECL_ERR_RDYLNK; 2430 /* QP confirmation over RoCE fabric */ 2431 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 2432 reason_code = smcr_serv_conf_first_link(new_smc); 2433 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 2434 } 2435 return reason_code; 2436 } 2437 2438 /* setup for connection of server */ 2439 static void smc_listen_work(struct work_struct *work) 2440 { 2441 struct smc_sock *new_smc = container_of(work, struct smc_sock, 2442 smc_listen_work); 2443 struct socket *newclcsock = new_smc->clcsock; 2444 struct smc_clc_msg_accept_confirm *cclc; 2445 struct smc_clc_msg_proposal_area *buf; 2446 struct smc_clc_msg_proposal *pclc; 2447 struct smc_init_info *ini = NULL; 2448 u8 proposal_version = SMC_V1; 2449 u8 accept_version; 2450 int rc = 0; 2451 2452 lock_sock(&new_smc->sk); /* release in smc_listen_out() */ 2453 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 2454 return smc_listen_out_err(new_smc); 2455 2456 if (new_smc->use_fallback) { 2457 smc_listen_out_connected(new_smc); 2458 return; 2459 } 2460 2461 /* check if peer is smc capable */ 2462 if (!tcp_sk(newclcsock->sk)->syn_smc) { 2463 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 2464 if (rc) 2465 smc_listen_out_err(new_smc); 2466 else 2467 smc_listen_out_connected(new_smc); 2468 return; 2469 } 2470 2471 /* do inband token exchange - 2472 * wait for and receive SMC Proposal CLC message 2473 */ 2474 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 2475 if (!buf) { 2476 rc = SMC_CLC_DECL_MEM; 2477 goto out_decl; 2478 } 2479 pclc = (struct smc_clc_msg_proposal *)buf; 2480 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2481 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2482 if (rc) 2483 goto out_decl; 2484 2485 if (pclc->hdr.version > SMC_V1) 2486 proposal_version = SMC_V2; 2487 2488 /* IPSec connections opt out of SMC optimizations */ 2489 if (using_ipsec(new_smc)) { 2490 rc = SMC_CLC_DECL_IPSEC; 2491 goto out_decl; 2492 } 2493 2494 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2495 if (!ini) { 2496 rc = SMC_CLC_DECL_MEM; 2497 goto out_decl; 2498 } 2499 2500 /* initial version checking */ 2501 rc = smc_listen_v2_check(new_smc, pclc, ini); 2502 if (rc) 2503 goto out_decl; 2504 2505 rc = smc_clc_srv_v2x_features_validate(new_smc, pclc, ini); 2506 if (rc) 2507 goto out_decl; 2508 2509 mutex_lock(&smc_server_lgr_pending); 2510 smc_rx_init(new_smc); 2511 smc_tx_init(new_smc); 2512 2513 /* determine ISM or RoCE device used for connection */ 2514 rc = smc_listen_find_device(new_smc, pclc, ini); 2515 if (rc) 2516 goto out_unlock; 2517 2518 /* send SMC Accept CLC message */ 2519 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2520 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2521 accept_version, ini->negotiated_eid, ini); 2522 if (rc) 2523 goto out_unlock; 2524 2525 /* SMC-D does not need this lock any more */ 2526 if (ini->is_smcd) 2527 mutex_unlock(&smc_server_lgr_pending); 2528 2529 /* receive SMC Confirm CLC message */ 2530 memset(buf, 0, sizeof(*buf)); 2531 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2532 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2533 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2534 if (rc) { 2535 if (!ini->is_smcd) 2536 goto out_unlock; 2537 goto out_decl; 2538 } 2539 2540 rc = smc_clc_v2x_features_confirm_check(cclc, ini); 2541 if (rc) { 2542 if (!ini->is_smcd) 2543 goto out_unlock; 2544 goto out_decl; 2545 } 2546 2547 /* fce smc release version is needed in smc_listen_rdma_finish, 2548 * so save fce info here. 2549 */ 2550 smc_conn_save_peer_info_fce(new_smc, cclc); 2551 2552 /* finish worker */ 2553 if (!ini->is_smcd) { 2554 rc = smc_listen_rdma_finish(new_smc, cclc, 2555 ini->first_contact_local, ini); 2556 if (rc) 2557 goto out_unlock; 2558 mutex_unlock(&smc_server_lgr_pending); 2559 } 2560 smc_conn_save_peer_info(new_smc, cclc); 2561 2562 if (ini->is_smcd && 2563 smc_ism_support_dmb_nocopy(new_smc->conn.lgr->smcd)) { 2564 rc = smcd_buf_attach(new_smc); 2565 if (rc) 2566 goto out_decl; 2567 } 2568 2569 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2570 /* smc_listen_out() will release smcsk */ 2571 smc_listen_out_connected(new_smc); 2572 goto out_free; 2573 2574 out_unlock: 2575 mutex_unlock(&smc_server_lgr_pending); 2576 out_decl: 2577 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2578 proposal_version); 2579 out_free: 2580 kfree(ini); 2581 kfree(buf); 2582 } 2583 2584 static void smc_tcp_listen_work(struct work_struct *work) 2585 { 2586 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2587 tcp_listen_work); 2588 struct sock *lsk = &lsmc->sk; 2589 struct smc_sock *new_smc; 2590 int rc = 0; 2591 2592 lock_sock(lsk); 2593 while (lsk->sk_state == SMC_LISTEN) { 2594 rc = smc_clcsock_accept(lsmc, &new_smc); 2595 if (rc) /* clcsock accept queue empty or error */ 2596 goto out; 2597 if (!new_smc) 2598 continue; 2599 2600 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 2601 atomic_inc(&lsmc->queued_smc_hs); 2602 2603 new_smc->listen_smc = lsmc; 2604 new_smc->use_fallback = lsmc->use_fallback; 2605 new_smc->fallback_rsn = lsmc->fallback_rsn; 2606 sock_hold(lsk); /* sock_put in smc_listen_work */ 2607 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2608 smc_copy_sock_settings_to_smc(new_smc); 2609 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2610 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2611 sock_put(&new_smc->sk); 2612 } 2613 2614 out: 2615 release_sock(lsk); 2616 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2617 } 2618 2619 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2620 { 2621 struct smc_sock *lsmc; 2622 2623 read_lock_bh(&listen_clcsock->sk_callback_lock); 2624 lsmc = smc_clcsock_user_data(listen_clcsock); 2625 if (!lsmc) 2626 goto out; 2627 lsmc->clcsk_data_ready(listen_clcsock); 2628 if (lsmc->sk.sk_state == SMC_LISTEN) { 2629 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2630 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work)) 2631 sock_put(&lsmc->sk); 2632 } 2633 out: 2634 read_unlock_bh(&listen_clcsock->sk_callback_lock); 2635 } 2636 2637 int smc_listen(struct socket *sock, int backlog) 2638 { 2639 struct sock *sk = sock->sk; 2640 struct smc_sock *smc; 2641 int rc; 2642 2643 smc = smc_sk(sk); 2644 lock_sock(sk); 2645 2646 rc = -EINVAL; 2647 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2648 smc->connect_nonblock || sock->state != SS_UNCONNECTED) 2649 goto out; 2650 2651 rc = 0; 2652 if (sk->sk_state == SMC_LISTEN) { 2653 sk->sk_max_ack_backlog = backlog; 2654 goto out; 2655 } 2656 /* some socket options are handled in core, so we could not apply 2657 * them to the clc socket -- copy smc socket options to clc socket 2658 */ 2659 smc_copy_sock_settings_to_clc(smc); 2660 if (!smc->use_fallback) 2661 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2662 2663 /* save original sk_data_ready function and establish 2664 * smc-specific sk_data_ready function 2665 */ 2666 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2667 smc->clcsock->sk->sk_user_data = 2668 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2669 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready, 2670 smc_clcsock_data_ready, &smc->clcsk_data_ready); 2671 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2672 2673 /* save original ops */ 2674 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops; 2675 2676 smc->af_ops = *smc->ori_af_ops; 2677 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock; 2678 2679 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; 2680 2681 if (smc->limit_smc_hs) 2682 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; 2683 2684 rc = kernel_listen(smc->clcsock, backlog); 2685 if (rc) { 2686 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2687 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready, 2688 &smc->clcsk_data_ready); 2689 smc->clcsock->sk->sk_user_data = NULL; 2690 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2691 goto out; 2692 } 2693 sk->sk_max_ack_backlog = backlog; 2694 sk->sk_ack_backlog = 0; 2695 sk->sk_state = SMC_LISTEN; 2696 2697 out: 2698 release_sock(sk); 2699 return rc; 2700 } 2701 2702 int smc_accept(struct socket *sock, struct socket *new_sock, 2703 struct proto_accept_arg *arg) 2704 { 2705 struct sock *sk = sock->sk, *nsk; 2706 DECLARE_WAITQUEUE(wait, current); 2707 struct smc_sock *lsmc; 2708 long timeo; 2709 int rc = 0; 2710 2711 lsmc = smc_sk(sk); 2712 sock_hold(sk); /* sock_put below */ 2713 lock_sock(sk); 2714 2715 if (lsmc->sk.sk_state != SMC_LISTEN) { 2716 rc = -EINVAL; 2717 release_sock(sk); 2718 goto out; 2719 } 2720 2721 /* Wait for an incoming connection */ 2722 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 2723 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2724 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2725 set_current_state(TASK_INTERRUPTIBLE); 2726 if (!timeo) { 2727 rc = -EAGAIN; 2728 break; 2729 } 2730 release_sock(sk); 2731 timeo = schedule_timeout(timeo); 2732 /* wakeup by sk_data_ready in smc_listen_work() */ 2733 sched_annotate_sleep(); 2734 lock_sock(sk); 2735 if (signal_pending(current)) { 2736 rc = sock_intr_errno(timeo); 2737 break; 2738 } 2739 } 2740 set_current_state(TASK_RUNNING); 2741 remove_wait_queue(sk_sleep(sk), &wait); 2742 2743 if (!rc) 2744 rc = sock_error(nsk); 2745 release_sock(sk); 2746 if (rc) 2747 goto out; 2748 2749 if (lsmc->sockopt_defer_accept && !(arg->flags & O_NONBLOCK)) { 2750 /* wait till data arrives on the socket */ 2751 timeo = secs_to_jiffies(lsmc->sockopt_defer_accept); 2752 if (smc_sk(nsk)->use_fallback) { 2753 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2754 2755 lock_sock(clcsk); 2756 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2757 sk_wait_data(clcsk, &timeo, NULL); 2758 release_sock(clcsk); 2759 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2760 lock_sock(nsk); 2761 smc_rx_wait(smc_sk(nsk), &timeo, 0, smc_rx_data_available); 2762 release_sock(nsk); 2763 } 2764 } 2765 2766 out: 2767 sock_put(sk); /* sock_hold above */ 2768 return rc; 2769 } 2770 2771 int smc_getname(struct socket *sock, struct sockaddr *addr, 2772 int peer) 2773 { 2774 struct smc_sock *smc; 2775 2776 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2777 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2778 return -ENOTCONN; 2779 2780 smc = smc_sk(sock->sk); 2781 2782 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2783 } 2784 2785 int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2786 { 2787 struct sock *sk = sock->sk; 2788 struct smc_sock *smc; 2789 int rc; 2790 2791 smc = smc_sk(sk); 2792 lock_sock(sk); 2793 2794 /* SMC does not support connect with fastopen */ 2795 if (msg->msg_flags & MSG_FASTOPEN) { 2796 /* not connected yet, fallback */ 2797 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2798 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2799 if (rc) 2800 goto out; 2801 } else { 2802 rc = -EINVAL; 2803 goto out; 2804 } 2805 } else if ((sk->sk_state != SMC_ACTIVE) && 2806 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2807 (sk->sk_state != SMC_INIT)) { 2808 rc = -EPIPE; 2809 goto out; 2810 } 2811 2812 if (smc->use_fallback) { 2813 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2814 } else { 2815 rc = smc_tx_sendmsg(smc, msg, len); 2816 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2817 } 2818 out: 2819 release_sock(sk); 2820 return rc; 2821 } 2822 2823 int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2824 int flags) 2825 { 2826 struct sock *sk = sock->sk; 2827 struct smc_sock *smc; 2828 int rc = -ENOTCONN; 2829 2830 smc = smc_sk(sk); 2831 lock_sock(sk); 2832 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2833 /* socket was connected before, no more data to read */ 2834 rc = 0; 2835 goto out; 2836 } 2837 if ((sk->sk_state == SMC_INIT) || 2838 (sk->sk_state == SMC_LISTEN) || 2839 (sk->sk_state == SMC_CLOSED)) 2840 goto out; 2841 2842 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2843 rc = 0; 2844 goto out; 2845 } 2846 2847 if (smc->use_fallback) { 2848 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2849 } else { 2850 msg->msg_namelen = 0; 2851 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2852 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2853 } 2854 2855 out: 2856 release_sock(sk); 2857 return rc; 2858 } 2859 2860 static __poll_t smc_accept_poll(struct sock *parent) 2861 { 2862 struct smc_sock *isk = smc_sk(parent); 2863 __poll_t mask = 0; 2864 2865 spin_lock(&isk->accept_q_lock); 2866 if (!list_empty(&isk->accept_q)) 2867 mask = EPOLLIN | EPOLLRDNORM; 2868 spin_unlock(&isk->accept_q_lock); 2869 2870 return mask; 2871 } 2872 2873 __poll_t smc_poll(struct file *file, struct socket *sock, 2874 poll_table *wait) 2875 { 2876 struct sock *sk = sock->sk; 2877 struct smc_sock *smc; 2878 __poll_t mask = 0; 2879 2880 if (!sk) 2881 return EPOLLNVAL; 2882 2883 smc = smc_sk(sock->sk); 2884 if (smc->use_fallback) { 2885 /* delegate to CLC child sock */ 2886 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2887 sk->sk_err = smc->clcsock->sk->sk_err; 2888 } else { 2889 if (sk->sk_state != SMC_CLOSED) 2890 sock_poll_wait(file, sock, wait); 2891 if (sk->sk_err) 2892 mask |= EPOLLERR; 2893 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2894 (sk->sk_state == SMC_CLOSED)) 2895 mask |= EPOLLHUP; 2896 if (sk->sk_state == SMC_LISTEN) { 2897 /* woken up by sk_data_ready in smc_listen_work() */ 2898 mask |= smc_accept_poll(sk); 2899 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2900 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2901 wait); 2902 sk->sk_err = smc->clcsock->sk->sk_err; 2903 } else { 2904 if ((sk->sk_state != SMC_INIT && 2905 atomic_read(&smc->conn.sndbuf_space)) || 2906 sk->sk_shutdown & SEND_SHUTDOWN) { 2907 mask |= EPOLLOUT | EPOLLWRNORM; 2908 } else { 2909 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2910 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2911 2912 if (sk->sk_state != SMC_INIT) { 2913 /* Race breaker the same way as tcp_poll(). */ 2914 smp_mb__after_atomic(); 2915 if (atomic_read(&smc->conn.sndbuf_space)) 2916 mask |= EPOLLOUT | EPOLLWRNORM; 2917 } 2918 } 2919 if (atomic_read(&smc->conn.bytes_to_rcv)) 2920 mask |= EPOLLIN | EPOLLRDNORM; 2921 if (sk->sk_shutdown & RCV_SHUTDOWN) 2922 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2923 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2924 mask |= EPOLLIN; 2925 if (smc->conn.urg_state == SMC_URG_VALID) 2926 mask |= EPOLLPRI; 2927 } 2928 } 2929 2930 return mask; 2931 } 2932 2933 int smc_shutdown(struct socket *sock, int how) 2934 { 2935 struct sock *sk = sock->sk; 2936 bool do_shutdown = true; 2937 struct smc_sock *smc; 2938 int rc = -EINVAL; 2939 int old_state; 2940 int rc1 = 0; 2941 2942 smc = smc_sk(sk); 2943 2944 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2945 return rc; 2946 2947 lock_sock(sk); 2948 2949 if (sock->state == SS_CONNECTING) { 2950 if (sk->sk_state == SMC_ACTIVE) 2951 sock->state = SS_CONNECTED; 2952 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 || 2953 sk->sk_state == SMC_PEERCLOSEWAIT2 || 2954 sk->sk_state == SMC_APPCLOSEWAIT1 || 2955 sk->sk_state == SMC_APPCLOSEWAIT2 || 2956 sk->sk_state == SMC_APPFINCLOSEWAIT) 2957 sock->state = SS_DISCONNECTING; 2958 } 2959 2960 rc = -ENOTCONN; 2961 if ((sk->sk_state != SMC_ACTIVE) && 2962 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2963 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2964 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2965 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2966 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2967 goto out; 2968 if (smc->use_fallback) { 2969 rc = kernel_sock_shutdown(smc->clcsock, how); 2970 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2971 if (sk->sk_shutdown == SHUTDOWN_MASK) { 2972 sk->sk_state = SMC_CLOSED; 2973 sk->sk_socket->state = SS_UNCONNECTED; 2974 sock_put(sk); 2975 } 2976 goto out; 2977 } 2978 switch (how) { 2979 case SHUT_RDWR: /* shutdown in both directions */ 2980 old_state = sk->sk_state; 2981 rc = smc_close_active(smc); 2982 if (old_state == SMC_ACTIVE && 2983 sk->sk_state == SMC_PEERCLOSEWAIT1) 2984 do_shutdown = false; 2985 break; 2986 case SHUT_WR: 2987 rc = smc_close_shutdown_write(smc); 2988 break; 2989 case SHUT_RD: 2990 rc = 0; 2991 /* nothing more to do because peer is not involved */ 2992 break; 2993 } 2994 if (do_shutdown && smc->clcsock) 2995 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2996 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2997 sk->sk_shutdown |= how + 1; 2998 2999 if (sk->sk_state == SMC_CLOSED) 3000 sock->state = SS_UNCONNECTED; 3001 else 3002 sock->state = SS_DISCONNECTING; 3003 out: 3004 release_sock(sk); 3005 return rc ? rc : rc1; 3006 } 3007 3008 static int __smc_getsockopt(struct socket *sock, int level, int optname, 3009 char __user *optval, int __user *optlen) 3010 { 3011 struct smc_sock *smc; 3012 int val, len; 3013 3014 smc = smc_sk(sock->sk); 3015 3016 if (get_user(len, optlen)) 3017 return -EFAULT; 3018 3019 len = min_t(int, len, sizeof(int)); 3020 3021 if (len < 0) 3022 return -EINVAL; 3023 3024 switch (optname) { 3025 case SMC_LIMIT_HS: 3026 val = smc->limit_smc_hs; 3027 break; 3028 default: 3029 return -EOPNOTSUPP; 3030 } 3031 3032 if (put_user(len, optlen)) 3033 return -EFAULT; 3034 if (copy_to_user(optval, &val, len)) 3035 return -EFAULT; 3036 3037 return 0; 3038 } 3039 3040 static int __smc_setsockopt(struct socket *sock, int level, int optname, 3041 sockptr_t optval, unsigned int optlen) 3042 { 3043 struct sock *sk = sock->sk; 3044 struct smc_sock *smc; 3045 int val, rc; 3046 3047 smc = smc_sk(sk); 3048 3049 lock_sock(sk); 3050 switch (optname) { 3051 case SMC_LIMIT_HS: 3052 if (optlen < sizeof(int)) { 3053 rc = -EINVAL; 3054 break; 3055 } 3056 if (copy_from_sockptr(&val, optval, sizeof(int))) { 3057 rc = -EFAULT; 3058 break; 3059 } 3060 3061 smc->limit_smc_hs = !!val; 3062 rc = 0; 3063 break; 3064 default: 3065 rc = -EOPNOTSUPP; 3066 break; 3067 } 3068 release_sock(sk); 3069 3070 return rc; 3071 } 3072 3073 int smc_setsockopt(struct socket *sock, int level, int optname, 3074 sockptr_t optval, unsigned int optlen) 3075 { 3076 struct sock *sk = sock->sk; 3077 struct smc_sock *smc; 3078 int val, rc; 3079 3080 if (level == SOL_TCP && optname == TCP_ULP) 3081 return -EOPNOTSUPP; 3082 else if (level == SOL_SMC) 3083 return __smc_setsockopt(sock, level, optname, optval, optlen); 3084 3085 smc = smc_sk(sk); 3086 3087 /* generic setsockopts reaching us here always apply to the 3088 * CLC socket 3089 */ 3090 mutex_lock(&smc->clcsock_release_lock); 3091 if (!smc->clcsock) { 3092 mutex_unlock(&smc->clcsock_release_lock); 3093 return -EBADF; 3094 } 3095 if (unlikely(!smc->clcsock->ops->setsockopt)) 3096 rc = -EOPNOTSUPP; 3097 else 3098 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 3099 optval, optlen); 3100 if (smc->clcsock->sk->sk_err) { 3101 sk->sk_err = smc->clcsock->sk->sk_err; 3102 sk_error_report(sk); 3103 } 3104 mutex_unlock(&smc->clcsock_release_lock); 3105 3106 if (optlen < sizeof(int)) 3107 return -EINVAL; 3108 if (copy_from_sockptr(&val, optval, sizeof(int))) 3109 return -EFAULT; 3110 3111 lock_sock(sk); 3112 if (rc || smc->use_fallback) 3113 goto out; 3114 switch (optname) { 3115 case TCP_FASTOPEN: 3116 case TCP_FASTOPEN_CONNECT: 3117 case TCP_FASTOPEN_KEY: 3118 case TCP_FASTOPEN_NO_COOKIE: 3119 /* option not supported by SMC */ 3120 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 3121 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 3122 } else { 3123 rc = -EINVAL; 3124 } 3125 break; 3126 case TCP_NODELAY: 3127 if (sk->sk_state != SMC_INIT && 3128 sk->sk_state != SMC_LISTEN && 3129 sk->sk_state != SMC_CLOSED) { 3130 if (val) { 3131 SMC_STAT_INC(smc, ndly_cnt); 3132 smc_tx_pending(&smc->conn); 3133 cancel_delayed_work(&smc->conn.tx_work); 3134 } 3135 } 3136 break; 3137 case TCP_CORK: 3138 if (sk->sk_state != SMC_INIT && 3139 sk->sk_state != SMC_LISTEN && 3140 sk->sk_state != SMC_CLOSED) { 3141 if (!val) { 3142 SMC_STAT_INC(smc, cork_cnt); 3143 smc_tx_pending(&smc->conn); 3144 cancel_delayed_work(&smc->conn.tx_work); 3145 } 3146 } 3147 break; 3148 case TCP_DEFER_ACCEPT: 3149 smc->sockopt_defer_accept = val; 3150 break; 3151 default: 3152 break; 3153 } 3154 out: 3155 release_sock(sk); 3156 3157 return rc; 3158 } 3159 3160 int smc_getsockopt(struct socket *sock, int level, int optname, 3161 char __user *optval, int __user *optlen) 3162 { 3163 struct smc_sock *smc; 3164 int rc; 3165 3166 if (level == SOL_SMC) 3167 return __smc_getsockopt(sock, level, optname, optval, optlen); 3168 3169 smc = smc_sk(sock->sk); 3170 mutex_lock(&smc->clcsock_release_lock); 3171 if (!smc->clcsock) { 3172 mutex_unlock(&smc->clcsock_release_lock); 3173 return -EBADF; 3174 } 3175 /* socket options apply to the CLC socket */ 3176 if (unlikely(!smc->clcsock->ops->getsockopt)) { 3177 mutex_unlock(&smc->clcsock_release_lock); 3178 return -EOPNOTSUPP; 3179 } 3180 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 3181 optval, optlen); 3182 mutex_unlock(&smc->clcsock_release_lock); 3183 return rc; 3184 } 3185 3186 int smc_ioctl(struct socket *sock, unsigned int cmd, 3187 unsigned long arg) 3188 { 3189 union smc_host_cursor cons, urg; 3190 struct smc_connection *conn; 3191 struct smc_sock *smc; 3192 int answ; 3193 3194 smc = smc_sk(sock->sk); 3195 conn = &smc->conn; 3196 lock_sock(&smc->sk); 3197 if (smc->use_fallback) { 3198 if (!smc->clcsock) { 3199 release_sock(&smc->sk); 3200 return -EBADF; 3201 } 3202 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 3203 release_sock(&smc->sk); 3204 return answ; 3205 } 3206 switch (cmd) { 3207 case SIOCINQ: /* same as FIONREAD */ 3208 if (smc->sk.sk_state == SMC_LISTEN) { 3209 release_sock(&smc->sk); 3210 return -EINVAL; 3211 } 3212 if (smc->sk.sk_state == SMC_INIT || 3213 smc->sk.sk_state == SMC_CLOSED) 3214 answ = 0; 3215 else 3216 answ = atomic_read(&smc->conn.bytes_to_rcv); 3217 break; 3218 case SIOCOUTQ: 3219 /* output queue size (not send + not acked) */ 3220 if (smc->sk.sk_state == SMC_LISTEN) { 3221 release_sock(&smc->sk); 3222 return -EINVAL; 3223 } 3224 if (smc->sk.sk_state == SMC_INIT || 3225 smc->sk.sk_state == SMC_CLOSED) 3226 answ = 0; 3227 else 3228 answ = smc->conn.sndbuf_desc->len - 3229 atomic_read(&smc->conn.sndbuf_space); 3230 break; 3231 case SIOCOUTQNSD: 3232 /* output queue size (not send only) */ 3233 if (smc->sk.sk_state == SMC_LISTEN) { 3234 release_sock(&smc->sk); 3235 return -EINVAL; 3236 } 3237 if (smc->sk.sk_state == SMC_INIT || 3238 smc->sk.sk_state == SMC_CLOSED) 3239 answ = 0; 3240 else 3241 answ = smc_tx_prepared_sends(&smc->conn); 3242 break; 3243 case SIOCATMARK: 3244 if (smc->sk.sk_state == SMC_LISTEN) { 3245 release_sock(&smc->sk); 3246 return -EINVAL; 3247 } 3248 if (smc->sk.sk_state == SMC_INIT || 3249 smc->sk.sk_state == SMC_CLOSED) { 3250 answ = 0; 3251 } else { 3252 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 3253 smc_curs_copy(&urg, &conn->urg_curs, conn); 3254 answ = smc_curs_diff(conn->rmb_desc->len, 3255 &cons, &urg) == 1; 3256 } 3257 break; 3258 default: 3259 release_sock(&smc->sk); 3260 return -ENOIOCTLCMD; 3261 } 3262 release_sock(&smc->sk); 3263 3264 return put_user(answ, (int __user *)arg); 3265 } 3266 3267 /* Map the affected portions of the rmbe into an spd, note the number of bytes 3268 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 3269 * updates till whenever a respective page has been fully processed. 3270 * Note that subsequent recv() calls have to wait till all splice() processing 3271 * completed. 3272 */ 3273 ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 3274 struct pipe_inode_info *pipe, size_t len, 3275 unsigned int flags) 3276 { 3277 struct sock *sk = sock->sk; 3278 struct smc_sock *smc; 3279 int rc = -ENOTCONN; 3280 3281 smc = smc_sk(sk); 3282 lock_sock(sk); 3283 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 3284 /* socket was connected before, no more data to read */ 3285 rc = 0; 3286 goto out; 3287 } 3288 if (sk->sk_state == SMC_INIT || 3289 sk->sk_state == SMC_LISTEN || 3290 sk->sk_state == SMC_CLOSED) 3291 goto out; 3292 3293 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 3294 rc = 0; 3295 goto out; 3296 } 3297 3298 if (smc->use_fallback) { 3299 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 3300 pipe, len, flags); 3301 } else { 3302 if (*ppos) { 3303 rc = -ESPIPE; 3304 goto out; 3305 } 3306 if (flags & SPLICE_F_NONBLOCK) 3307 flags = MSG_DONTWAIT; 3308 else 3309 flags = 0; 3310 SMC_STAT_INC(smc, splice_cnt); 3311 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 3312 } 3313 out: 3314 release_sock(sk); 3315 3316 return rc; 3317 } 3318 3319 /* must look like tcp */ 3320 static const struct proto_ops smc_sock_ops = { 3321 .family = PF_SMC, 3322 .owner = THIS_MODULE, 3323 .release = smc_release, 3324 .bind = smc_bind, 3325 .connect = smc_connect, 3326 .socketpair = sock_no_socketpair, 3327 .accept = smc_accept, 3328 .getname = smc_getname, 3329 .poll = smc_poll, 3330 .ioctl = smc_ioctl, 3331 .listen = smc_listen, 3332 .shutdown = smc_shutdown, 3333 .setsockopt = smc_setsockopt, 3334 .getsockopt = smc_getsockopt, 3335 .sendmsg = smc_sendmsg, 3336 .recvmsg = smc_recvmsg, 3337 .mmap = sock_no_mmap, 3338 .splice_read = smc_splice_read, 3339 }; 3340 3341 int smc_create_clcsk(struct net *net, struct sock *sk, int family) 3342 { 3343 struct smc_sock *smc = smc_sk(sk); 3344 int rc; 3345 3346 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 3347 &smc->clcsock); 3348 if (rc) 3349 return rc; 3350 3351 /* smc_clcsock_release() does not wait smc->clcsock->sk's 3352 * destruction; its sk_state might not be TCP_CLOSE after 3353 * smc->sk is close()d, and TCP timers can be fired later, 3354 * which need net ref. 3355 */ 3356 sk = smc->clcsock->sk; 3357 sk_net_refcnt_upgrade(sk); 3358 return 0; 3359 } 3360 3361 static int __smc_create(struct net *net, struct socket *sock, int protocol, 3362 int kern, struct socket *clcsock) 3363 { 3364 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 3365 struct smc_sock *smc; 3366 struct sock *sk; 3367 int rc; 3368 3369 rc = -ESOCKTNOSUPPORT; 3370 if (sock->type != SOCK_STREAM) 3371 goto out; 3372 3373 rc = -EPROTONOSUPPORT; 3374 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 3375 goto out; 3376 3377 rc = -ENOBUFS; 3378 sock->ops = &smc_sock_ops; 3379 sock->state = SS_UNCONNECTED; 3380 sk = smc_sock_alloc(net, sock, protocol); 3381 if (!sk) 3382 goto out; 3383 3384 /* create internal TCP socket for CLC handshake and fallback */ 3385 smc = smc_sk(sk); 3386 3387 rc = 0; 3388 if (clcsock) 3389 smc->clcsock = clcsock; 3390 else 3391 rc = smc_create_clcsk(net, sk, family); 3392 3393 if (rc) { 3394 sk_common_release(sk); 3395 sock->sk = NULL; 3396 } 3397 out: 3398 return rc; 3399 } 3400 3401 static int smc_create(struct net *net, struct socket *sock, int protocol, 3402 int kern) 3403 { 3404 return __smc_create(net, sock, protocol, kern, NULL); 3405 } 3406 3407 static const struct net_proto_family smc_sock_family_ops = { 3408 .family = PF_SMC, 3409 .owner = THIS_MODULE, 3410 .create = smc_create, 3411 }; 3412 3413 static int smc_ulp_init(struct sock *sk) 3414 { 3415 struct socket *tcp = sk->sk_socket; 3416 struct net *net = sock_net(sk); 3417 struct socket *smcsock; 3418 int protocol, ret; 3419 3420 /* only TCP can be replaced */ 3421 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 3422 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 3423 return -ESOCKTNOSUPPORT; 3424 /* don't handle wq now */ 3425 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 3426 return -ENOTCONN; 3427 3428 if (sk->sk_family == AF_INET) 3429 protocol = SMCPROTO_SMC; 3430 else 3431 protocol = SMCPROTO_SMC6; 3432 3433 smcsock = sock_alloc(); 3434 if (!smcsock) 3435 return -ENFILE; 3436 3437 smcsock->type = SOCK_STREAM; 3438 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 3439 ret = __smc_create(net, smcsock, protocol, 1, tcp); 3440 if (ret) { 3441 sock_release(smcsock); /* module_put() which ops won't be NULL */ 3442 return ret; 3443 } 3444 3445 /* replace tcp socket to smc */ 3446 smcsock->file = tcp->file; 3447 smcsock->file->private_data = smcsock; 3448 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 3449 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 3450 tcp->file = NULL; 3451 3452 return ret; 3453 } 3454 3455 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 3456 const gfp_t priority) 3457 { 3458 struct inet_connection_sock *icsk = inet_csk(newsk); 3459 3460 /* don't inherit ulp ops to child when listen */ 3461 icsk->icsk_ulp_ops = NULL; 3462 } 3463 3464 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 3465 .name = "smc", 3466 .owner = THIS_MODULE, 3467 .init = smc_ulp_init, 3468 .clone = smc_ulp_clone, 3469 }; 3470 3471 unsigned int smc_net_id; 3472 3473 static __net_init int smc_net_init(struct net *net) 3474 { 3475 int rc; 3476 3477 rc = smc_sysctl_net_init(net); 3478 if (rc) 3479 return rc; 3480 return smc_pnet_net_init(net); 3481 } 3482 3483 static void __net_exit smc_net_exit(struct net *net) 3484 { 3485 smc_sysctl_net_exit(net); 3486 smc_pnet_net_exit(net); 3487 } 3488 3489 static __net_init int smc_net_stat_init(struct net *net) 3490 { 3491 return smc_stats_init(net); 3492 } 3493 3494 static void __net_exit smc_net_stat_exit(struct net *net) 3495 { 3496 smc_stats_exit(net); 3497 } 3498 3499 static struct pernet_operations smc_net_ops = { 3500 .init = smc_net_init, 3501 .exit = smc_net_exit, 3502 .id = &smc_net_id, 3503 .size = sizeof(struct smc_net), 3504 }; 3505 3506 static struct pernet_operations smc_net_stat_ops = { 3507 .init = smc_net_stat_init, 3508 .exit = smc_net_stat_exit, 3509 }; 3510 3511 static int __init smc_init(void) 3512 { 3513 int rc; 3514 3515 rc = register_pernet_subsys(&smc_net_ops); 3516 if (rc) 3517 return rc; 3518 3519 rc = register_pernet_subsys(&smc_net_stat_ops); 3520 if (rc) 3521 goto out_pernet_subsys; 3522 3523 rc = smc_ism_init(); 3524 if (rc) 3525 goto out_pernet_subsys_stat; 3526 smc_clc_init(); 3527 3528 rc = smc_nl_init(); 3529 if (rc) 3530 goto out_ism; 3531 3532 rc = smc_pnet_init(); 3533 if (rc) 3534 goto out_nl; 3535 3536 rc = -ENOMEM; 3537 3538 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0); 3539 if (!smc_tcp_ls_wq) 3540 goto out_pnet; 3541 3542 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 3543 if (!smc_hs_wq) 3544 goto out_alloc_tcp_ls_wq; 3545 3546 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 3547 if (!smc_close_wq) 3548 goto out_alloc_hs_wq; 3549 3550 rc = smc_core_init(); 3551 if (rc) { 3552 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 3553 goto out_alloc_wqs; 3554 } 3555 3556 rc = smc_llc_init(); 3557 if (rc) { 3558 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 3559 goto out_core; 3560 } 3561 3562 rc = smc_cdc_init(); 3563 if (rc) { 3564 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 3565 goto out_core; 3566 } 3567 3568 rc = proto_register(&smc_proto, 1); 3569 if (rc) { 3570 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 3571 goto out_core; 3572 } 3573 3574 rc = proto_register(&smc_proto6, 1); 3575 if (rc) { 3576 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 3577 goto out_proto; 3578 } 3579 3580 rc = sock_register(&smc_sock_family_ops); 3581 if (rc) { 3582 pr_err("%s: sock_register fails with %d\n", __func__, rc); 3583 goto out_proto6; 3584 } 3585 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 3586 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 3587 3588 rc = smc_ib_register_client(); 3589 if (rc) { 3590 pr_err("%s: ib_register fails with %d\n", __func__, rc); 3591 goto out_sock; 3592 } 3593 3594 rc = smc_loopback_init(); 3595 if (rc) { 3596 pr_err("%s: smc_loopback_init fails with %d\n", __func__, rc); 3597 goto out_ib; 3598 } 3599 3600 rc = tcp_register_ulp(&smc_ulp_ops); 3601 if (rc) { 3602 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 3603 goto out_lo; 3604 } 3605 rc = smc_inet_init(); 3606 if (rc) { 3607 pr_err("%s: smc_inet_init fails with %d\n", __func__, rc); 3608 goto out_ulp; 3609 } 3610 static_branch_enable(&tcp_have_smc); 3611 return 0; 3612 out_ulp: 3613 tcp_unregister_ulp(&smc_ulp_ops); 3614 out_lo: 3615 smc_loopback_exit(); 3616 out_ib: 3617 smc_ib_unregister_client(); 3618 out_sock: 3619 sock_unregister(PF_SMC); 3620 out_proto6: 3621 proto_unregister(&smc_proto6); 3622 out_proto: 3623 proto_unregister(&smc_proto); 3624 out_core: 3625 smc_core_exit(); 3626 out_alloc_wqs: 3627 destroy_workqueue(smc_close_wq); 3628 out_alloc_hs_wq: 3629 destroy_workqueue(smc_hs_wq); 3630 out_alloc_tcp_ls_wq: 3631 destroy_workqueue(smc_tcp_ls_wq); 3632 out_pnet: 3633 smc_pnet_exit(); 3634 out_nl: 3635 smc_nl_exit(); 3636 out_ism: 3637 smc_clc_exit(); 3638 smc_ism_exit(); 3639 out_pernet_subsys_stat: 3640 unregister_pernet_subsys(&smc_net_stat_ops); 3641 out_pernet_subsys: 3642 unregister_pernet_subsys(&smc_net_ops); 3643 3644 return rc; 3645 } 3646 3647 static void __exit smc_exit(void) 3648 { 3649 static_branch_disable(&tcp_have_smc); 3650 smc_inet_exit(); 3651 tcp_unregister_ulp(&smc_ulp_ops); 3652 sock_unregister(PF_SMC); 3653 smc_core_exit(); 3654 smc_loopback_exit(); 3655 smc_ib_unregister_client(); 3656 smc_ism_exit(); 3657 destroy_workqueue(smc_close_wq); 3658 destroy_workqueue(smc_tcp_ls_wq); 3659 destroy_workqueue(smc_hs_wq); 3660 proto_unregister(&smc_proto6); 3661 proto_unregister(&smc_proto); 3662 smc_pnet_exit(); 3663 smc_nl_exit(); 3664 smc_clc_exit(); 3665 unregister_pernet_subsys(&smc_net_stat_ops); 3666 unregister_pernet_subsys(&smc_net_ops); 3667 rcu_barrier(); 3668 } 3669 3670 module_init(smc_init); 3671 module_exit(smc_exit); 3672 3673 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3674 MODULE_DESCRIPTION("smc socket address family"); 3675 MODULE_LICENSE("GPL"); 3676 MODULE_ALIAS_NETPROTO(PF_SMC); 3677 MODULE_ALIAS_TCP_ULP("smc"); 3678 /* 256 for IPPROTO_SMC and 1 for SOCK_STREAM */ 3679 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 256, 1); 3680 #if IS_ENABLED(CONFIG_IPV6) 3681 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 256, 1); 3682 #endif /* CONFIG_IPV6 */ 3683 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME); 3684