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_sock *smc, 1101 struct smc_init_info *ini) 1102 { 1103 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 1104 return SMC_CLC_DECL_ISMVLANERR; 1105 return 0; 1106 } 1107 1108 static int smc_find_proposal_devices(struct smc_sock *smc, 1109 struct smc_init_info *ini) 1110 { 1111 int rc = 0; 1112 1113 /* check if there is an ism device available */ 1114 if (!(ini->smcd_version & SMC_V1) || 1115 smc_find_ism_device(smc, ini) || 1116 smc_connect_ism_vlan_setup(smc, ini)) 1117 ini->smcd_version &= ~SMC_V1; 1118 /* else ISM V1 is supported for this connection */ 1119 1120 /* check if there is an rdma device available */ 1121 if (!(ini->smcr_version & SMC_V1) || 1122 smc_find_rdma_device(smc, ini)) 1123 ini->smcr_version &= ~SMC_V1; 1124 /* else RDMA is supported for this connection */ 1125 1126 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 1127 ini->smcr_version & SMC_V1); 1128 1129 /* check if there is an ism v2 device available */ 1130 if (!(ini->smcd_version & SMC_V2) || 1131 !smc_ism_is_v2_capable() || 1132 smc_find_ism_v2_device_clnt(smc, ini)) 1133 ini->smcd_version &= ~SMC_V2; 1134 1135 /* check if there is an rdma v2 device available */ 1136 ini->check_smcrv2 = true; 1137 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 1138 if (!(ini->smcr_version & SMC_V2) || 1139 #if IS_ENABLED(CONFIG_IPV6) 1140 (smc->clcsock->sk->sk_family == AF_INET6 && 1141 !ipv6_addr_v4mapped(&smc->clcsock->sk->sk_v6_rcv_saddr)) || 1142 #endif 1143 !smc_clc_ueid_count() || 1144 smc_find_rdma_device(smc, ini)) 1145 ini->smcr_version &= ~SMC_V2; 1146 ini->check_smcrv2 = false; 1147 1148 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 1149 ini->smcr_version & SMC_V2); 1150 1151 /* if neither ISM nor RDMA are supported, fallback */ 1152 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 1153 rc = SMC_CLC_DECL_NOSMCDEV; 1154 1155 return rc; 1156 } 1157 1158 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 1159 * used, the VLAN ID will be registered again during the connection setup. 1160 */ 1161 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 1162 struct smc_init_info *ini) 1163 { 1164 if (!smcd_indicated(ini->smc_type_v1)) 1165 return 0; 1166 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 1167 return SMC_CLC_DECL_CNFERR; 1168 return 0; 1169 } 1170 1171 #define SMC_CLC_MAX_ACCEPT_LEN \ 1172 (sizeof(struct smc_clc_msg_accept_confirm) + \ 1173 sizeof(struct smc_clc_first_contact_ext_v2x) + \ 1174 sizeof(struct smc_clc_msg_trail)) 1175 1176 /* CLC handshake during connect */ 1177 static int smc_connect_clc(struct smc_sock *smc, 1178 struct smc_clc_msg_accept_confirm *aclc, 1179 struct smc_init_info *ini) 1180 { 1181 int rc = 0; 1182 1183 /* do inband token exchange */ 1184 rc = smc_clc_send_proposal(smc, ini); 1185 if (rc) 1186 return rc; 1187 /* receive SMC Accept CLC message */ 1188 return smc_clc_wait_msg(smc, aclc, SMC_CLC_MAX_ACCEPT_LEN, 1189 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 1190 } 1191 1192 void smc_fill_gid_list(struct smc_link_group *lgr, 1193 struct smc_gidlist *gidlist, 1194 struct smc_ib_device *known_dev, u8 *known_gid) 1195 { 1196 struct smc_init_info *alt_ini = NULL; 1197 1198 memset(gidlist, 0, sizeof(*gidlist)); 1199 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 1200 1201 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 1202 if (!alt_ini) 1203 goto out; 1204 1205 alt_ini->vlan_id = lgr->vlan_id; 1206 alt_ini->check_smcrv2 = true; 1207 alt_ini->smcrv2.saddr = lgr->saddr; 1208 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 1209 1210 if (!alt_ini->smcrv2.ib_dev_v2) 1211 goto out; 1212 1213 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 1214 SMC_GID_SIZE); 1215 1216 out: 1217 kfree(alt_ini); 1218 } 1219 1220 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 1221 struct smc_clc_msg_accept_confirm *aclc, 1222 struct smc_init_info *ini) 1223 { 1224 struct smc_clc_first_contact_ext *fce = 1225 smc_get_clc_first_contact_ext(aclc, false); 1226 struct net *net = sock_net(&smc->sk); 1227 int rc; 1228 1229 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 1230 return 0; 1231 1232 if (fce->v2_direct) { 1233 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 1234 ini->smcrv2.uses_gateway = false; 1235 } else { 1236 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr, 1237 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 1238 ini->smcrv2.nexthop_mac, 1239 &ini->smcrv2.uses_gateway)) 1240 return SMC_CLC_DECL_NOROUTE; 1241 if (!ini->smcrv2.uses_gateway) { 1242 /* mismatch: peer claims indirect, but its direct */ 1243 return SMC_CLC_DECL_NOINDIRECT; 1244 } 1245 } 1246 1247 ini->release_nr = fce->release; 1248 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1249 if (rc) 1250 return rc; 1251 1252 return 0; 1253 } 1254 1255 /* setup for RDMA connection of client */ 1256 static int smc_connect_rdma(struct smc_sock *smc, 1257 struct smc_clc_msg_accept_confirm *aclc, 1258 struct smc_init_info *ini) 1259 { 1260 int i, reason_code = 0; 1261 struct smc_link *link; 1262 u8 *eid = NULL; 1263 1264 ini->is_smcd = false; 1265 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 1266 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1267 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 1268 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 1269 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 1270 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1271 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1272 1273 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 1274 if (reason_code) 1275 return reason_code; 1276 1277 mutex_lock(&smc_client_lgr_pending); 1278 reason_code = smc_conn_create(smc, ini); 1279 if (reason_code) { 1280 mutex_unlock(&smc_client_lgr_pending); 1281 return reason_code; 1282 } 1283 1284 smc_conn_save_peer_info(smc, aclc); 1285 1286 if (ini->first_contact_local) { 1287 link = smc->conn.lnk; 1288 } else { 1289 /* set link that was assigned by server */ 1290 link = NULL; 1291 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1292 struct smc_link *l = &smc->conn.lgr->lnk[i]; 1293 1294 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 1295 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 1296 SMC_GID_SIZE) && 1297 (aclc->hdr.version > SMC_V1 || 1298 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 1299 sizeof(l->peer_mac)))) { 1300 link = l; 1301 break; 1302 } 1303 } 1304 if (!link) { 1305 reason_code = SMC_CLC_DECL_NOSRVLINK; 1306 goto connect_abort; 1307 } 1308 smc_switch_link_and_count(&smc->conn, link); 1309 } 1310 1311 /* create send buffer and rmb */ 1312 if (smc_buf_create(smc, false)) { 1313 reason_code = SMC_CLC_DECL_MEM; 1314 goto connect_abort; 1315 } 1316 1317 if (ini->first_contact_local) 1318 smc_link_save_peer_info(link, aclc, ini); 1319 1320 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 1321 reason_code = SMC_CLC_DECL_ERR_RTOK; 1322 goto connect_abort; 1323 } 1324 1325 smc_rx_init(smc); 1326 1327 if (ini->first_contact_local) { 1328 if (smc_ib_ready_link(link)) { 1329 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1330 goto connect_abort; 1331 } 1332 } else { 1333 /* reg sendbufs if they were vzalloced */ 1334 if (smc->conn.sndbuf_desc->is_vm) { 1335 if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) { 1336 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1337 goto connect_abort; 1338 } 1339 } 1340 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 1341 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1342 goto connect_abort; 1343 } 1344 } 1345 1346 if (aclc->hdr.version > SMC_V1) { 1347 eid = aclc->r1.eid; 1348 if (ini->first_contact_local) 1349 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 1350 link->smcibdev, link->gid); 1351 } 1352 1353 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 1354 aclc->hdr.version, eid, ini); 1355 if (reason_code) 1356 goto connect_abort; 1357 1358 smc_tx_init(smc); 1359 1360 if (ini->first_contact_local) { 1361 /* QP confirmation over RoCE fabric */ 1362 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1363 reason_code = smcr_clnt_conf_first_link(smc); 1364 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1365 if (reason_code) 1366 goto connect_abort; 1367 } 1368 mutex_unlock(&smc_client_lgr_pending); 1369 1370 smc_copy_sock_settings_to_clc(smc); 1371 smc->connect_nonblock = 0; 1372 if (smc->sk.sk_state == SMC_INIT) 1373 smc->sk.sk_state = SMC_ACTIVE; 1374 1375 return 0; 1376 connect_abort: 1377 smc_conn_abort(smc, ini->first_contact_local); 1378 mutex_unlock(&smc_client_lgr_pending); 1379 smc->connect_nonblock = 0; 1380 1381 return reason_code; 1382 } 1383 1384 /* The server has chosen one of the proposed ISM devices for the communication. 1385 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1386 */ 1387 static int 1388 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm *aclc, 1389 struct smc_init_info *ini) 1390 { 1391 int i; 1392 1393 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1394 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1395 ini->ism_selected = i; 1396 return 0; 1397 } 1398 } 1399 1400 return -EPROTO; 1401 } 1402 1403 /* setup for ISM connection of client */ 1404 static int smc_connect_ism(struct smc_sock *smc, 1405 struct smc_clc_msg_accept_confirm *aclc, 1406 struct smc_init_info *ini) 1407 { 1408 u8 *eid = NULL; 1409 int rc = 0; 1410 1411 ini->is_smcd = true; 1412 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1413 1414 if (aclc->hdr.version == SMC_V2) { 1415 if (ini->first_contact_peer) { 1416 struct smc_clc_first_contact_ext *fce = 1417 smc_get_clc_first_contact_ext(aclc, true); 1418 1419 ini->release_nr = fce->release; 1420 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1421 if (rc) 1422 return rc; 1423 } 1424 1425 rc = smc_v2_determine_accepted_chid(aclc, ini); 1426 if (rc) 1427 return rc; 1428 1429 if (__smc_ism_is_emulated(ini->ism_chid[ini->ism_selected])) 1430 ini->ism_peer_gid[ini->ism_selected].gid_ext = 1431 ntohll(aclc->d1.gid_ext); 1432 /* for non-Emulated-ISM devices, peer gid_ext remains 0. */ 1433 } 1434 ini->ism_peer_gid[ini->ism_selected].gid = ntohll(aclc->d0.gid); 1435 1436 /* there is only one lgr role for SMC-D; use server lock */ 1437 mutex_lock(&smc_server_lgr_pending); 1438 rc = smc_conn_create(smc, ini); 1439 if (rc) { 1440 mutex_unlock(&smc_server_lgr_pending); 1441 return rc; 1442 } 1443 1444 /* Create send and receive buffers */ 1445 rc = smc_buf_create(smc, true); 1446 if (rc) { 1447 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1448 goto connect_abort; 1449 } 1450 1451 smc_conn_save_peer_info(smc, aclc); 1452 1453 if (smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) { 1454 rc = smcd_buf_attach(smc); 1455 if (rc) { 1456 rc = SMC_CLC_DECL_MEM; /* try to fallback */ 1457 goto connect_abort; 1458 } 1459 } 1460 smc_rx_init(smc); 1461 smc_tx_init(smc); 1462 1463 if (aclc->hdr.version > SMC_V1) 1464 eid = aclc->d1.eid; 1465 1466 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1467 aclc->hdr.version, eid, ini); 1468 if (rc) 1469 goto connect_abort; 1470 mutex_unlock(&smc_server_lgr_pending); 1471 1472 smc_copy_sock_settings_to_clc(smc); 1473 smc->connect_nonblock = 0; 1474 if (smc->sk.sk_state == SMC_INIT) 1475 smc->sk.sk_state = SMC_ACTIVE; 1476 1477 return 0; 1478 connect_abort: 1479 smc_conn_abort(smc, ini->first_contact_local); 1480 mutex_unlock(&smc_server_lgr_pending); 1481 smc->connect_nonblock = 0; 1482 1483 return rc; 1484 } 1485 1486 /* check if received accept type and version matches a proposed one */ 1487 static int smc_connect_check_aclc(struct smc_init_info *ini, 1488 struct smc_clc_msg_accept_confirm *aclc) 1489 { 1490 if (aclc->hdr.version >= SMC_V2) { 1491 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1492 !smcr_indicated(ini->smc_type_v2)) || 1493 (aclc->hdr.typev1 == SMC_TYPE_D && 1494 !smcd_indicated(ini->smc_type_v2))) 1495 return SMC_CLC_DECL_MODEUNSUPP; 1496 } else { 1497 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1498 !smcr_indicated(ini->smc_type_v1)) || 1499 (aclc->hdr.typev1 == SMC_TYPE_D && 1500 !smcd_indicated(ini->smc_type_v1))) 1501 return SMC_CLC_DECL_MODEUNSUPP; 1502 } 1503 1504 return 0; 1505 } 1506 1507 /* perform steps before actually connecting */ 1508 static int __smc_connect(struct smc_sock *smc) 1509 { 1510 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1511 struct smc_clc_msg_accept_confirm *aclc; 1512 struct smc_init_info *ini = NULL; 1513 u8 *buf = NULL; 1514 int rc = 0; 1515 1516 if (smc->use_fallback) 1517 return smc_connect_fallback(smc, smc->fallback_rsn); 1518 1519 /* if peer has not signalled SMC-capability, fall back */ 1520 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1521 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1522 1523 /* IPSec connections opt out of SMC optimizations */ 1524 if (using_ipsec(smc)) 1525 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1526 version); 1527 1528 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1529 if (!ini) 1530 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1531 version); 1532 1533 ini->smcd_version = SMC_V1 | SMC_V2; 1534 ini->smcr_version = SMC_V1 | SMC_V2; 1535 ini->smc_type_v1 = SMC_TYPE_B; 1536 ini->smc_type_v2 = SMC_TYPE_B; 1537 1538 /* get vlan id from IP device */ 1539 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1540 ini->smcd_version &= ~SMC_V1; 1541 ini->smcr_version = 0; 1542 ini->smc_type_v1 = SMC_TYPE_N; 1543 } 1544 1545 rc = smc_find_proposal_devices(smc, ini); 1546 if (rc) 1547 goto fallback; 1548 1549 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1550 if (!buf) { 1551 rc = SMC_CLC_DECL_MEM; 1552 goto fallback; 1553 } 1554 aclc = (struct smc_clc_msg_accept_confirm *)buf; 1555 1556 /* perform CLC handshake */ 1557 rc = smc_connect_clc(smc, aclc, ini); 1558 if (rc) { 1559 /* -EAGAIN on timeout, see tcp_recvmsg() */ 1560 if (rc == -EAGAIN) { 1561 rc = -ETIMEDOUT; 1562 smc->sk.sk_err = ETIMEDOUT; 1563 } 1564 goto vlan_cleanup; 1565 } 1566 1567 /* check if smc modes and versions of CLC proposal and accept match */ 1568 rc = smc_connect_check_aclc(ini, aclc); 1569 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1570 if (rc) 1571 goto vlan_cleanup; 1572 1573 /* depending on previous steps, connect using rdma or ism */ 1574 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1575 ini->smcr_version = version; 1576 rc = smc_connect_rdma(smc, aclc, ini); 1577 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1578 ini->smcd_version = version; 1579 rc = smc_connect_ism(smc, aclc, ini); 1580 } 1581 if (rc) 1582 goto vlan_cleanup; 1583 1584 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1585 smc_connect_ism_vlan_cleanup(smc, ini); 1586 kfree(buf); 1587 kfree(ini); 1588 return 0; 1589 1590 vlan_cleanup: 1591 smc_connect_ism_vlan_cleanup(smc, ini); 1592 kfree(buf); 1593 fallback: 1594 kfree(ini); 1595 return smc_connect_decline_fallback(smc, rc, version); 1596 } 1597 1598 static void smc_connect_work(struct work_struct *work) 1599 { 1600 struct smc_sock *smc = container_of(work, struct smc_sock, 1601 connect_work); 1602 long timeo = READ_ONCE(smc->sk.sk_sndtimeo); 1603 int rc = 0; 1604 1605 if (!timeo) 1606 timeo = MAX_SCHEDULE_TIMEOUT; 1607 lock_sock(smc->clcsock->sk); 1608 if (smc->clcsock->sk->sk_err) { 1609 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1610 } else if ((1 << smc->clcsock->sk->sk_state) & 1611 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1612 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1613 if ((rc == -EPIPE) && 1614 ((1 << smc->clcsock->sk->sk_state) & 1615 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1616 rc = 0; 1617 } 1618 release_sock(smc->clcsock->sk); 1619 lock_sock(&smc->sk); 1620 if (rc != 0 || smc->sk.sk_err) { 1621 smc->sk.sk_state = SMC_CLOSED; 1622 if (rc == -EPIPE || rc == -EAGAIN) 1623 smc->sk.sk_err = EPIPE; 1624 else if (rc == -ECONNREFUSED) 1625 smc->sk.sk_err = ECONNREFUSED; 1626 else if (signal_pending(current)) 1627 smc->sk.sk_err = -sock_intr_errno(timeo); 1628 sock_put(&smc->sk); /* passive closing */ 1629 goto out; 1630 } 1631 1632 rc = __smc_connect(smc); 1633 if (rc < 0) 1634 smc->sk.sk_err = -rc; 1635 1636 out: 1637 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1638 if (smc->sk.sk_err) { 1639 smc->sk.sk_state_change(&smc->sk); 1640 } else { /* allow polling before and after fallback decision */ 1641 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1642 smc->sk.sk_write_space(&smc->sk); 1643 } 1644 } 1645 release_sock(&smc->sk); 1646 } 1647 1648 int smc_connect(struct socket *sock, struct sockaddr *addr, 1649 int alen, int flags) 1650 { 1651 struct sock *sk = sock->sk; 1652 struct smc_sock *smc; 1653 int rc = -EINVAL; 1654 1655 smc = smc_sk(sk); 1656 1657 /* separate smc parameter checking to be safe */ 1658 if (alen < sizeof(addr->sa_family)) 1659 goto out_err; 1660 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1661 goto out_err; 1662 1663 lock_sock(sk); 1664 switch (sock->state) { 1665 default: 1666 rc = -EINVAL; 1667 goto out; 1668 case SS_CONNECTED: 1669 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL; 1670 goto out; 1671 case SS_CONNECTING: 1672 if (sk->sk_state == SMC_ACTIVE) 1673 goto connected; 1674 break; 1675 case SS_UNCONNECTED: 1676 sock->state = SS_CONNECTING; 1677 break; 1678 } 1679 1680 switch (sk->sk_state) { 1681 default: 1682 goto out; 1683 case SMC_CLOSED: 1684 rc = sock_error(sk) ? : -ECONNABORTED; 1685 sock->state = SS_UNCONNECTED; 1686 goto out; 1687 case SMC_ACTIVE: 1688 rc = -EISCONN; 1689 goto out; 1690 case SMC_INIT: 1691 break; 1692 } 1693 1694 smc_copy_sock_settings_to_clc(smc); 1695 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1696 if (smc->connect_nonblock) { 1697 rc = -EALREADY; 1698 goto out; 1699 } 1700 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1701 if (rc && rc != -EINPROGRESS) 1702 goto out; 1703 1704 if (smc->use_fallback) { 1705 sock->state = rc ? SS_CONNECTING : SS_CONNECTED; 1706 goto out; 1707 } 1708 sock_hold(&smc->sk); /* sock put in passive closing */ 1709 if (flags & O_NONBLOCK) { 1710 if (queue_work(smc_hs_wq, &smc->connect_work)) 1711 smc->connect_nonblock = 1; 1712 rc = -EINPROGRESS; 1713 goto out; 1714 } else { 1715 rc = __smc_connect(smc); 1716 if (rc < 0) 1717 goto out; 1718 } 1719 1720 connected: 1721 rc = 0; 1722 sock->state = SS_CONNECTED; 1723 out: 1724 release_sock(sk); 1725 out_err: 1726 return rc; 1727 } 1728 1729 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1730 { 1731 struct socket *new_clcsock = NULL; 1732 struct sock *lsk = &lsmc->sk; 1733 struct sock *new_sk; 1734 int rc = -EINVAL; 1735 1736 release_sock(lsk); 1737 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1738 if (!new_sk) { 1739 rc = -ENOMEM; 1740 lsk->sk_err = ENOMEM; 1741 *new_smc = NULL; 1742 lock_sock(lsk); 1743 goto out; 1744 } 1745 *new_smc = smc_sk(new_sk); 1746 1747 mutex_lock(&lsmc->clcsock_release_lock); 1748 if (lsmc->clcsock) 1749 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1750 mutex_unlock(&lsmc->clcsock_release_lock); 1751 lock_sock(lsk); 1752 if (rc < 0 && rc != -EAGAIN) 1753 lsk->sk_err = -rc; 1754 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1755 new_sk->sk_prot->unhash(new_sk); 1756 if (new_clcsock) 1757 sock_release(new_clcsock); 1758 new_sk->sk_state = SMC_CLOSED; 1759 smc_sock_set_flag(new_sk, SOCK_DEAD); 1760 sock_put(new_sk); /* final */ 1761 *new_smc = NULL; 1762 goto out; 1763 } 1764 1765 /* new clcsock has inherited the smc listen-specific sk_data_ready 1766 * function; switch it back to the original sk_data_ready function 1767 */ 1768 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1769 1770 /* if new clcsock has also inherited the fallback-specific callback 1771 * functions, switch them back to the original ones. 1772 */ 1773 if (lsmc->use_fallback) { 1774 if (lsmc->clcsk_state_change) 1775 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change; 1776 if (lsmc->clcsk_write_space) 1777 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space; 1778 if (lsmc->clcsk_error_report) 1779 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report; 1780 } 1781 1782 (*new_smc)->clcsock = new_clcsock; 1783 out: 1784 return rc; 1785 } 1786 1787 /* add a just created sock to the accept queue of the listen sock as 1788 * candidate for a following socket accept call from user space 1789 */ 1790 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1791 { 1792 struct smc_sock *par = smc_sk(parent); 1793 1794 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1795 spin_lock(&par->accept_q_lock); 1796 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1797 spin_unlock(&par->accept_q_lock); 1798 sk_acceptq_added(parent); 1799 } 1800 1801 /* remove a socket from the accept queue of its parental listening socket */ 1802 static void smc_accept_unlink(struct sock *sk) 1803 { 1804 struct smc_sock *par = smc_sk(sk)->listen_smc; 1805 1806 spin_lock(&par->accept_q_lock); 1807 list_del_init(&smc_sk(sk)->accept_q); 1808 spin_unlock(&par->accept_q_lock); 1809 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1810 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1811 } 1812 1813 /* remove a sock from the accept queue to bind it to a new socket created 1814 * for a socket accept call from user space 1815 */ 1816 struct sock *smc_accept_dequeue(struct sock *parent, 1817 struct socket *new_sock) 1818 { 1819 struct smc_sock *isk, *n; 1820 struct sock *new_sk; 1821 1822 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1823 new_sk = (struct sock *)isk; 1824 1825 smc_accept_unlink(new_sk); 1826 if (new_sk->sk_state == SMC_CLOSED) { 1827 new_sk->sk_prot->unhash(new_sk); 1828 if (isk->clcsock) { 1829 sock_release(isk->clcsock); 1830 isk->clcsock = NULL; 1831 } 1832 sock_put(new_sk); /* final */ 1833 continue; 1834 } 1835 if (new_sock) { 1836 sock_graft(new_sk, new_sock); 1837 new_sock->state = SS_CONNECTED; 1838 if (isk->use_fallback) { 1839 smc_sk(new_sk)->clcsock->file = new_sock->file; 1840 isk->clcsock->file->private_data = isk->clcsock; 1841 } 1842 } 1843 return new_sk; 1844 } 1845 return NULL; 1846 } 1847 1848 /* clean up for a created but never accepted sock */ 1849 void smc_close_non_accepted(struct sock *sk) 1850 { 1851 struct smc_sock *smc = smc_sk(sk); 1852 1853 sock_hold(sk); /* sock_put below */ 1854 lock_sock(sk); 1855 if (!sk->sk_lingertime) 1856 /* wait for peer closing */ 1857 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT); 1858 __smc_release(smc); 1859 release_sock(sk); 1860 sock_put(sk); /* sock_hold above */ 1861 sock_put(sk); /* final sock_put */ 1862 } 1863 1864 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1865 { 1866 struct smc_link *link = smc->conn.lnk; 1867 struct smc_llc_qentry *qentry; 1868 int rc; 1869 1870 /* reg the sndbuf if it was vzalloced*/ 1871 if (smc->conn.sndbuf_desc->is_vm) { 1872 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) 1873 return SMC_CLC_DECL_ERR_REGBUF; 1874 } 1875 1876 /* reg the rmb */ 1877 if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) 1878 return SMC_CLC_DECL_ERR_REGBUF; 1879 1880 /* send CONFIRM LINK request to client over the RoCE fabric */ 1881 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1882 if (rc < 0) 1883 return SMC_CLC_DECL_TIMEOUT_CL; 1884 1885 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1886 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1887 SMC_LLC_CONFIRM_LINK); 1888 if (!qentry) { 1889 struct smc_clc_msg_decline dclc; 1890 1891 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1892 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1893 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1894 } 1895 smc_llc_save_peer_uid(qentry); 1896 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1897 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1898 if (rc) 1899 return SMC_CLC_DECL_RMBE_EC; 1900 1901 /* confirm_rkey is implicit on 1st contact */ 1902 smc->conn.rmb_desc->is_conf_rkey = true; 1903 1904 smc_llc_link_active(link); 1905 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1906 1907 if (link->lgr->max_links > 1) { 1908 down_write(&link->lgr->llc_conf_mutex); 1909 /* initial contact - try to establish second link */ 1910 smc_llc_srv_add_link(link, NULL); 1911 up_write(&link->lgr->llc_conf_mutex); 1912 } 1913 return 0; 1914 } 1915 1916 /* listen worker: finish */ 1917 static void smc_listen_out(struct smc_sock *new_smc) 1918 { 1919 struct smc_sock *lsmc = new_smc->listen_smc; 1920 struct sock *newsmcsk = &new_smc->sk; 1921 1922 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 1923 atomic_dec(&lsmc->queued_smc_hs); 1924 1925 release_sock(newsmcsk); /* lock in smc_listen_work() */ 1926 if (lsmc->sk.sk_state == SMC_LISTEN) { 1927 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1928 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1929 release_sock(&lsmc->sk); 1930 } else { /* no longer listening */ 1931 smc_close_non_accepted(newsmcsk); 1932 } 1933 1934 /* Wake up accept */ 1935 lsmc->sk.sk_data_ready(&lsmc->sk); 1936 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1937 } 1938 1939 /* listen worker: finish in state connected */ 1940 static void smc_listen_out_connected(struct smc_sock *new_smc) 1941 { 1942 struct sock *newsmcsk = &new_smc->sk; 1943 1944 if (newsmcsk->sk_state == SMC_INIT) 1945 newsmcsk->sk_state = SMC_ACTIVE; 1946 1947 smc_listen_out(new_smc); 1948 } 1949 1950 /* listen worker: finish in error state */ 1951 static void smc_listen_out_err(struct smc_sock *new_smc) 1952 { 1953 struct sock *newsmcsk = &new_smc->sk; 1954 struct net *net = sock_net(newsmcsk); 1955 1956 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1957 if (newsmcsk->sk_state == SMC_INIT) 1958 sock_put(&new_smc->sk); /* passive closing */ 1959 newsmcsk->sk_state = SMC_CLOSED; 1960 1961 smc_listen_out(new_smc); 1962 } 1963 1964 /* listen worker: decline and fall back if possible */ 1965 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1966 int local_first, u8 version) 1967 { 1968 /* RDMA setup failed, switch back to TCP */ 1969 smc_conn_abort(new_smc, local_first); 1970 if (reason_code < 0 || 1971 smc_switch_to_fallback(new_smc, reason_code)) { 1972 /* error, no fallback possible */ 1973 smc_listen_out_err(new_smc); 1974 return; 1975 } 1976 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1977 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1978 smc_listen_out_err(new_smc); 1979 return; 1980 } 1981 } 1982 smc_listen_out_connected(new_smc); 1983 } 1984 1985 /* listen worker: version checking */ 1986 static int smc_listen_v2_check(struct smc_sock *new_smc, 1987 struct smc_clc_msg_proposal *pclc, 1988 struct smc_init_info *ini) 1989 { 1990 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1991 struct smc_clc_v2_extension *pclc_v2_ext; 1992 int rc = SMC_CLC_DECL_PEERNOSMC; 1993 1994 ini->smc_type_v1 = pclc->hdr.typev1; 1995 ini->smc_type_v2 = pclc->hdr.typev2; 1996 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1997 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1998 if (pclc->hdr.version > SMC_V1) { 1999 if (smcd_indicated(ini->smc_type_v2)) 2000 ini->smcd_version |= SMC_V2; 2001 if (smcr_indicated(ini->smc_type_v2)) 2002 ini->smcr_version |= SMC_V2; 2003 } 2004 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 2005 rc = SMC_CLC_DECL_PEERNOSMC; 2006 goto out; 2007 } 2008 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 2009 if (!pclc_v2_ext) { 2010 ini->smcd_version &= ~SMC_V2; 2011 ini->smcr_version &= ~SMC_V2; 2012 rc = SMC_CLC_DECL_NOV2EXT; 2013 goto out; 2014 } 2015 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 2016 if (ini->smcd_version & SMC_V2) { 2017 if (!smc_ism_is_v2_capable()) { 2018 ini->smcd_version &= ~SMC_V2; 2019 rc = SMC_CLC_DECL_NOISM2SUPP; 2020 } else if (!pclc_smcd_v2_ext) { 2021 ini->smcd_version &= ~SMC_V2; 2022 rc = SMC_CLC_DECL_NOV2DEXT; 2023 } else if (!pclc_v2_ext->hdr.eid_cnt && 2024 !pclc_v2_ext->hdr.flag.seid) { 2025 ini->smcd_version &= ~SMC_V2; 2026 rc = SMC_CLC_DECL_NOUEID; 2027 } 2028 } 2029 if (ini->smcr_version & SMC_V2) { 2030 if (!pclc_v2_ext->hdr.eid_cnt) { 2031 ini->smcr_version &= ~SMC_V2; 2032 rc = SMC_CLC_DECL_NOUEID; 2033 } 2034 } 2035 2036 ini->release_nr = pclc_v2_ext->hdr.flag.release; 2037 if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE) 2038 ini->release_nr = SMC_RELEASE; 2039 2040 out: 2041 if (!ini->smcd_version && !ini->smcr_version) 2042 return rc; 2043 2044 return 0; 2045 } 2046 2047 /* listen worker: check prefixes */ 2048 static int smc_listen_prfx_check(struct smc_sock *new_smc, 2049 struct smc_clc_msg_proposal *pclc) 2050 { 2051 struct smc_clc_msg_proposal_prefix *pclc_prfx; 2052 struct socket *newclcsock = new_smc->clcsock; 2053 2054 if (pclc->hdr.typev1 == SMC_TYPE_N) 2055 return 0; 2056 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 2057 if (!pclc_prfx) 2058 return -EPROTO; 2059 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 2060 return SMC_CLC_DECL_DIFFPREFIX; 2061 2062 return 0; 2063 } 2064 2065 /* listen worker: initialize connection and buffers */ 2066 static int smc_listen_rdma_init(struct smc_sock *new_smc, 2067 struct smc_init_info *ini) 2068 { 2069 int rc; 2070 2071 /* allocate connection / link group */ 2072 rc = smc_conn_create(new_smc, ini); 2073 if (rc) 2074 return rc; 2075 2076 /* create send buffer and rmb */ 2077 if (smc_buf_create(new_smc, false)) { 2078 smc_conn_abort(new_smc, ini->first_contact_local); 2079 return SMC_CLC_DECL_MEM; 2080 } 2081 2082 return 0; 2083 } 2084 2085 /* listen worker: initialize connection and buffers for SMC-D */ 2086 static int smc_listen_ism_init(struct smc_sock *new_smc, 2087 struct smc_init_info *ini) 2088 { 2089 int rc; 2090 2091 rc = smc_conn_create(new_smc, ini); 2092 if (rc) 2093 return rc; 2094 2095 /* Create send and receive buffers */ 2096 rc = smc_buf_create(new_smc, true); 2097 if (rc) { 2098 smc_conn_abort(new_smc, ini->first_contact_local); 2099 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 2100 SMC_CLC_DECL_MEM; 2101 } 2102 2103 return 0; 2104 } 2105 2106 static bool smc_is_already_selected(struct smcd_dev *smcd, 2107 struct smc_init_info *ini, 2108 int matches) 2109 { 2110 int i; 2111 2112 for (i = 0; i < matches; i++) 2113 if (smcd == ini->ism_dev[i]) 2114 return true; 2115 2116 return false; 2117 } 2118 2119 /* check for ISM devices matching proposed ISM devices */ 2120 static void smc_check_ism_v2_match(struct smc_init_info *ini, 2121 u16 proposed_chid, 2122 struct smcd_gid *proposed_gid, 2123 unsigned int *matches) 2124 { 2125 struct smcd_dev *smcd; 2126 2127 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2128 if (smcd->going_away) 2129 continue; 2130 if (smc_is_already_selected(smcd, ini, *matches)) 2131 continue; 2132 if (smc_ism_get_chid(smcd) == proposed_chid && 2133 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 2134 ini->ism_peer_gid[*matches].gid = proposed_gid->gid; 2135 if (__smc_ism_is_emulated(proposed_chid)) 2136 ini->ism_peer_gid[*matches].gid_ext = 2137 proposed_gid->gid_ext; 2138 /* non-Emulated-ISM's peer gid_ext remains 0. */ 2139 ini->ism_dev[*matches] = smcd; 2140 (*matches)++; 2141 break; 2142 } 2143 } 2144 } 2145 2146 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 2147 { 2148 if (!ini->rc) 2149 ini->rc = rc; 2150 } 2151 2152 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 2153 struct smc_clc_msg_proposal *pclc, 2154 struct smc_init_info *ini) 2155 { 2156 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 2157 struct smc_clc_v2_extension *smc_v2_ext; 2158 struct smc_clc_msg_smcd *pclc_smcd; 2159 unsigned int matches = 0; 2160 struct smcd_gid smcd_gid; 2161 u8 smcd_version; 2162 u8 *eid = NULL; 2163 int i, rc; 2164 u16 chid; 2165 2166 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 2167 goto not_found; 2168 2169 pclc_smcd = smc_get_clc_msg_smcd(pclc); 2170 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2171 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 2172 if (!pclc_smcd || !smc_v2_ext || !smcd_v2_ext) 2173 goto not_found; 2174 2175 mutex_lock(&smcd_dev_list.mutex); 2176 if (pclc_smcd->ism.chid) { 2177 /* check for ISM device matching proposed native ISM device */ 2178 smcd_gid.gid = ntohll(pclc_smcd->ism.gid); 2179 smcd_gid.gid_ext = 0; 2180 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 2181 &smcd_gid, &matches); 2182 } 2183 for (i = 0; i < smc_v2_ext->hdr.ism_gid_cnt; i++) { 2184 /* check for ISM devices matching proposed non-native ISM 2185 * devices 2186 */ 2187 smcd_gid.gid = ntohll(smcd_v2_ext->gidchid[i].gid); 2188 smcd_gid.gid_ext = 0; 2189 chid = ntohs(smcd_v2_ext->gidchid[i].chid); 2190 if (__smc_ism_is_emulated(chid)) { 2191 if ((i + 1) == smc_v2_ext->hdr.ism_gid_cnt || 2192 chid != ntohs(smcd_v2_ext->gidchid[i + 1].chid)) 2193 /* each Emulated-ISM device takes two GID-CHID 2194 * entries and CHID of the second entry repeats 2195 * that of the first entry. 2196 * 2197 * So check if the next GID-CHID entry exists 2198 * and both two entries' CHIDs are the same. 2199 */ 2200 continue; 2201 smcd_gid.gid_ext = 2202 ntohll(smcd_v2_ext->gidchid[++i].gid); 2203 } 2204 smc_check_ism_v2_match(ini, chid, &smcd_gid, &matches); 2205 } 2206 mutex_unlock(&smcd_dev_list.mutex); 2207 2208 if (!ini->ism_dev[0]) { 2209 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 2210 goto not_found; 2211 } 2212 2213 smc_ism_get_system_eid(&eid); 2214 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 2215 smcd_v2_ext->system_eid, eid)) 2216 goto not_found; 2217 2218 /* separate - outside the smcd_dev_list.lock */ 2219 smcd_version = ini->smcd_version; 2220 for (i = 0; i < matches; i++) { 2221 ini->smcd_version = SMC_V2; 2222 ini->is_smcd = true; 2223 ini->ism_selected = i; 2224 rc = smc_listen_ism_init(new_smc, ini); 2225 if (rc) { 2226 smc_find_ism_store_rc(rc, ini); 2227 /* try next active ISM device */ 2228 continue; 2229 } 2230 return; /* matching and usable V2 ISM device found */ 2231 } 2232 /* no V2 ISM device could be initialized */ 2233 ini->smcd_version = smcd_version; /* restore original value */ 2234 ini->negotiated_eid[0] = 0; 2235 2236 not_found: 2237 ini->smcd_version &= ~SMC_V2; 2238 ini->ism_dev[0] = NULL; 2239 ini->is_smcd = false; 2240 } 2241 2242 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 2243 struct smc_clc_msg_proposal *pclc, 2244 struct smc_init_info *ini) 2245 { 2246 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 2247 int rc = 0; 2248 2249 /* check if ISM V1 is available */ 2250 if (!(ini->smcd_version & SMC_V1) || 2251 !smcd_indicated(ini->smc_type_v1) || 2252 !pclc_smcd) 2253 goto not_found; 2254 ini->is_smcd = true; /* prepare ISM check */ 2255 ini->ism_peer_gid[0].gid = ntohll(pclc_smcd->ism.gid); 2256 ini->ism_peer_gid[0].gid_ext = 0; 2257 rc = smc_find_ism_device(new_smc, ini); 2258 if (rc) 2259 goto not_found; 2260 ini->ism_selected = 0; 2261 rc = smc_listen_ism_init(new_smc, ini); 2262 if (!rc) 2263 return; /* V1 ISM device found */ 2264 2265 not_found: 2266 smc_find_ism_store_rc(rc, ini); 2267 ini->smcd_version &= ~SMC_V1; 2268 ini->ism_dev[0] = NULL; 2269 ini->is_smcd = false; 2270 } 2271 2272 /* listen worker: register buffers */ 2273 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 2274 { 2275 struct smc_connection *conn = &new_smc->conn; 2276 2277 if (!local_first) { 2278 /* reg sendbufs if they were vzalloced */ 2279 if (conn->sndbuf_desc->is_vm) { 2280 if (smcr_lgr_reg_sndbufs(conn->lnk, 2281 conn->sndbuf_desc)) 2282 return SMC_CLC_DECL_ERR_REGBUF; 2283 } 2284 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 2285 return SMC_CLC_DECL_ERR_REGBUF; 2286 } 2287 2288 return 0; 2289 } 2290 2291 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 2292 struct smc_clc_msg_proposal *pclc, 2293 struct smc_init_info *ini) 2294 { 2295 struct smc_clc_v2_extension *smc_v2_ext; 2296 u8 smcr_version; 2297 int rc; 2298 2299 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 2300 goto not_found; 2301 2302 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2303 if (!smc_v2_ext || 2304 !smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 2305 goto not_found; 2306 2307 /* prepare RDMA check */ 2308 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2309 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 2310 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2311 ini->check_smcrv2 = true; 2312 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 2313 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 2314 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 2315 rc = smc_find_rdma_device(new_smc, ini); 2316 if (rc) { 2317 smc_find_ism_store_rc(rc, ini); 2318 goto not_found; 2319 } 2320 if (!ini->smcrv2.uses_gateway) 2321 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 2322 2323 smcr_version = ini->smcr_version; 2324 ini->smcr_version = SMC_V2; 2325 rc = smc_listen_rdma_init(new_smc, ini); 2326 if (!rc) { 2327 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2328 if (rc) 2329 smc_conn_abort(new_smc, ini->first_contact_local); 2330 } 2331 if (!rc) 2332 return; 2333 ini->smcr_version = smcr_version; 2334 smc_find_ism_store_rc(rc, ini); 2335 2336 not_found: 2337 ini->smcr_version &= ~SMC_V2; 2338 ini->smcrv2.ib_dev_v2 = NULL; 2339 ini->check_smcrv2 = false; 2340 } 2341 2342 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 2343 struct smc_clc_msg_proposal *pclc, 2344 struct smc_init_info *ini) 2345 { 2346 int rc; 2347 2348 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 2349 return SMC_CLC_DECL_NOSMCDEV; 2350 2351 /* prepare RDMA check */ 2352 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2353 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 2354 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2355 rc = smc_find_rdma_device(new_smc, ini); 2356 if (rc) { 2357 /* no RDMA device found */ 2358 return SMC_CLC_DECL_NOSMCDEV; 2359 } 2360 rc = smc_listen_rdma_init(new_smc, ini); 2361 if (rc) 2362 return rc; 2363 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2364 } 2365 2366 /* determine the local device matching to proposal */ 2367 static int smc_listen_find_device(struct smc_sock *new_smc, 2368 struct smc_clc_msg_proposal *pclc, 2369 struct smc_init_info *ini) 2370 { 2371 int prfx_rc; 2372 2373 /* check for ISM device matching V2 proposed device */ 2374 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 2375 if (ini->ism_dev[0]) 2376 return 0; 2377 2378 /* check for matching IP prefix and subnet length (V1) */ 2379 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 2380 if (prfx_rc) 2381 smc_find_ism_store_rc(prfx_rc, ini); 2382 2383 /* get vlan id from IP device */ 2384 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 2385 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 2386 2387 /* check for ISM device matching V1 proposed device */ 2388 if (!prfx_rc) 2389 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 2390 if (ini->ism_dev[0]) 2391 return 0; 2392 2393 if (!smcr_indicated(pclc->hdr.typev1) && 2394 !smcr_indicated(pclc->hdr.typev2)) 2395 /* skip RDMA and decline */ 2396 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 2397 2398 /* check if RDMA V2 is available */ 2399 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 2400 if (ini->smcrv2.ib_dev_v2) 2401 return 0; 2402 2403 /* check if RDMA V1 is available */ 2404 if (!prfx_rc) { 2405 int rc; 2406 2407 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 2408 smc_find_ism_store_rc(rc, ini); 2409 return (!rc) ? 0 : ini->rc; 2410 } 2411 return prfx_rc; 2412 } 2413 2414 /* listen worker: finish RDMA setup */ 2415 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 2416 struct smc_clc_msg_accept_confirm *cclc, 2417 bool local_first, 2418 struct smc_init_info *ini) 2419 { 2420 struct smc_link *link = new_smc->conn.lnk; 2421 int reason_code = 0; 2422 2423 if (local_first) 2424 smc_link_save_peer_info(link, cclc, ini); 2425 2426 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 2427 return SMC_CLC_DECL_ERR_RTOK; 2428 2429 if (local_first) { 2430 if (smc_ib_ready_link(link)) 2431 return SMC_CLC_DECL_ERR_RDYLNK; 2432 /* QP confirmation over RoCE fabric */ 2433 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 2434 reason_code = smcr_serv_conf_first_link(new_smc); 2435 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 2436 } 2437 return reason_code; 2438 } 2439 2440 /* setup for connection of server */ 2441 static void smc_listen_work(struct work_struct *work) 2442 { 2443 struct smc_sock *new_smc = container_of(work, struct smc_sock, 2444 smc_listen_work); 2445 struct socket *newclcsock = new_smc->clcsock; 2446 struct smc_clc_msg_accept_confirm *cclc; 2447 struct smc_clc_msg_proposal_area *buf; 2448 struct smc_clc_msg_proposal *pclc; 2449 struct smc_init_info *ini = NULL; 2450 u8 proposal_version = SMC_V1; 2451 u8 accept_version; 2452 int rc = 0; 2453 2454 lock_sock(&new_smc->sk); /* release in smc_listen_out() */ 2455 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 2456 return smc_listen_out_err(new_smc); 2457 2458 if (new_smc->use_fallback) { 2459 smc_listen_out_connected(new_smc); 2460 return; 2461 } 2462 2463 /* check if peer is smc capable */ 2464 if (!tcp_sk(newclcsock->sk)->syn_smc) { 2465 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 2466 if (rc) 2467 smc_listen_out_err(new_smc); 2468 else 2469 smc_listen_out_connected(new_smc); 2470 return; 2471 } 2472 2473 /* do inband token exchange - 2474 * wait for and receive SMC Proposal CLC message 2475 */ 2476 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 2477 if (!buf) { 2478 rc = SMC_CLC_DECL_MEM; 2479 goto out_decl; 2480 } 2481 pclc = (struct smc_clc_msg_proposal *)buf; 2482 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2483 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2484 if (rc) 2485 goto out_decl; 2486 2487 if (pclc->hdr.version > SMC_V1) 2488 proposal_version = SMC_V2; 2489 2490 /* IPSec connections opt out of SMC optimizations */ 2491 if (using_ipsec(new_smc)) { 2492 rc = SMC_CLC_DECL_IPSEC; 2493 goto out_decl; 2494 } 2495 2496 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2497 if (!ini) { 2498 rc = SMC_CLC_DECL_MEM; 2499 goto out_decl; 2500 } 2501 2502 /* initial version checking */ 2503 rc = smc_listen_v2_check(new_smc, pclc, ini); 2504 if (rc) 2505 goto out_decl; 2506 2507 rc = smc_clc_srv_v2x_features_validate(new_smc, pclc, ini); 2508 if (rc) 2509 goto out_decl; 2510 2511 mutex_lock(&smc_server_lgr_pending); 2512 smc_rx_init(new_smc); 2513 smc_tx_init(new_smc); 2514 2515 /* determine ISM or RoCE device used for connection */ 2516 rc = smc_listen_find_device(new_smc, pclc, ini); 2517 if (rc) 2518 goto out_unlock; 2519 2520 /* send SMC Accept CLC message */ 2521 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2522 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2523 accept_version, ini->negotiated_eid, ini); 2524 if (rc) 2525 goto out_unlock; 2526 2527 /* SMC-D does not need this lock any more */ 2528 if (ini->is_smcd) 2529 mutex_unlock(&smc_server_lgr_pending); 2530 2531 /* receive SMC Confirm CLC message */ 2532 memset(buf, 0, sizeof(*buf)); 2533 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2534 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2535 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2536 if (rc) { 2537 if (!ini->is_smcd) 2538 goto out_unlock; 2539 goto out_decl; 2540 } 2541 2542 rc = smc_clc_v2x_features_confirm_check(cclc, ini); 2543 if (rc) { 2544 if (!ini->is_smcd) 2545 goto out_unlock; 2546 goto out_decl; 2547 } 2548 2549 /* fce smc release version is needed in smc_listen_rdma_finish, 2550 * so save fce info here. 2551 */ 2552 smc_conn_save_peer_info_fce(new_smc, cclc); 2553 2554 /* finish worker */ 2555 if (!ini->is_smcd) { 2556 rc = smc_listen_rdma_finish(new_smc, cclc, 2557 ini->first_contact_local, ini); 2558 if (rc) 2559 goto out_unlock; 2560 mutex_unlock(&smc_server_lgr_pending); 2561 } 2562 smc_conn_save_peer_info(new_smc, cclc); 2563 2564 if (ini->is_smcd && 2565 smc_ism_support_dmb_nocopy(new_smc->conn.lgr->smcd)) { 2566 rc = smcd_buf_attach(new_smc); 2567 if (rc) 2568 goto out_decl; 2569 } 2570 2571 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2572 /* smc_listen_out() will release smcsk */ 2573 smc_listen_out_connected(new_smc); 2574 goto out_free; 2575 2576 out_unlock: 2577 mutex_unlock(&smc_server_lgr_pending); 2578 out_decl: 2579 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2580 proposal_version); 2581 out_free: 2582 kfree(ini); 2583 kfree(buf); 2584 } 2585 2586 static void smc_tcp_listen_work(struct work_struct *work) 2587 { 2588 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2589 tcp_listen_work); 2590 struct sock *lsk = &lsmc->sk; 2591 struct smc_sock *new_smc; 2592 int rc = 0; 2593 2594 lock_sock(lsk); 2595 while (lsk->sk_state == SMC_LISTEN) { 2596 rc = smc_clcsock_accept(lsmc, &new_smc); 2597 if (rc) /* clcsock accept queue empty or error */ 2598 goto out; 2599 if (!new_smc) 2600 continue; 2601 2602 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 2603 atomic_inc(&lsmc->queued_smc_hs); 2604 2605 new_smc->listen_smc = lsmc; 2606 new_smc->use_fallback = lsmc->use_fallback; 2607 new_smc->fallback_rsn = lsmc->fallback_rsn; 2608 sock_hold(lsk); /* sock_put in smc_listen_work */ 2609 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2610 smc_copy_sock_settings_to_smc(new_smc); 2611 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2612 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2613 sock_put(&new_smc->sk); 2614 } 2615 2616 out: 2617 release_sock(lsk); 2618 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2619 } 2620 2621 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2622 { 2623 struct smc_sock *lsmc; 2624 2625 read_lock_bh(&listen_clcsock->sk_callback_lock); 2626 lsmc = smc_clcsock_user_data(listen_clcsock); 2627 if (!lsmc) 2628 goto out; 2629 lsmc->clcsk_data_ready(listen_clcsock); 2630 if (lsmc->sk.sk_state == SMC_LISTEN) { 2631 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2632 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work)) 2633 sock_put(&lsmc->sk); 2634 } 2635 out: 2636 read_unlock_bh(&listen_clcsock->sk_callback_lock); 2637 } 2638 2639 int smc_listen(struct socket *sock, int backlog) 2640 { 2641 struct sock *sk = sock->sk; 2642 struct smc_sock *smc; 2643 int rc; 2644 2645 smc = smc_sk(sk); 2646 lock_sock(sk); 2647 2648 rc = -EINVAL; 2649 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2650 smc->connect_nonblock || sock->state != SS_UNCONNECTED) 2651 goto out; 2652 2653 rc = 0; 2654 if (sk->sk_state == SMC_LISTEN) { 2655 sk->sk_max_ack_backlog = backlog; 2656 goto out; 2657 } 2658 /* some socket options are handled in core, so we could not apply 2659 * them to the clc socket -- copy smc socket options to clc socket 2660 */ 2661 smc_copy_sock_settings_to_clc(smc); 2662 if (!smc->use_fallback) 2663 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2664 2665 /* save original sk_data_ready function and establish 2666 * smc-specific sk_data_ready function 2667 */ 2668 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2669 smc->clcsock->sk->sk_user_data = 2670 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2671 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready, 2672 smc_clcsock_data_ready, &smc->clcsk_data_ready); 2673 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2674 2675 /* save original ops */ 2676 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops; 2677 2678 smc->af_ops = *smc->ori_af_ops; 2679 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock; 2680 2681 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; 2682 2683 if (smc->limit_smc_hs) 2684 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; 2685 2686 rc = kernel_listen(smc->clcsock, backlog); 2687 if (rc) { 2688 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2689 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready, 2690 &smc->clcsk_data_ready); 2691 smc->clcsock->sk->sk_user_data = NULL; 2692 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2693 goto out; 2694 } 2695 sk->sk_max_ack_backlog = backlog; 2696 sk->sk_ack_backlog = 0; 2697 sk->sk_state = SMC_LISTEN; 2698 2699 out: 2700 release_sock(sk); 2701 return rc; 2702 } 2703 2704 int smc_accept(struct socket *sock, struct socket *new_sock, 2705 struct proto_accept_arg *arg) 2706 { 2707 struct sock *sk = sock->sk, *nsk; 2708 DECLARE_WAITQUEUE(wait, current); 2709 struct smc_sock *lsmc; 2710 long timeo; 2711 int rc = 0; 2712 2713 lsmc = smc_sk(sk); 2714 sock_hold(sk); /* sock_put below */ 2715 lock_sock(sk); 2716 2717 if (lsmc->sk.sk_state != SMC_LISTEN) { 2718 rc = -EINVAL; 2719 release_sock(sk); 2720 goto out; 2721 } 2722 2723 /* Wait for an incoming connection */ 2724 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 2725 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2726 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2727 set_current_state(TASK_INTERRUPTIBLE); 2728 if (!timeo) { 2729 rc = -EAGAIN; 2730 break; 2731 } 2732 release_sock(sk); 2733 timeo = schedule_timeout(timeo); 2734 /* wakeup by sk_data_ready in smc_listen_work() */ 2735 sched_annotate_sleep(); 2736 lock_sock(sk); 2737 if (signal_pending(current)) { 2738 rc = sock_intr_errno(timeo); 2739 break; 2740 } 2741 } 2742 set_current_state(TASK_RUNNING); 2743 remove_wait_queue(sk_sleep(sk), &wait); 2744 2745 if (!rc) 2746 rc = sock_error(nsk); 2747 release_sock(sk); 2748 if (rc) 2749 goto out; 2750 2751 if (lsmc->sockopt_defer_accept && !(arg->flags & O_NONBLOCK)) { 2752 /* wait till data arrives on the socket */ 2753 timeo = secs_to_jiffies(lsmc->sockopt_defer_accept); 2754 if (smc_sk(nsk)->use_fallback) { 2755 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2756 2757 lock_sock(clcsk); 2758 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2759 sk_wait_data(clcsk, &timeo, NULL); 2760 release_sock(clcsk); 2761 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2762 lock_sock(nsk); 2763 smc_rx_wait(smc_sk(nsk), &timeo, 0, smc_rx_data_available); 2764 release_sock(nsk); 2765 } 2766 } 2767 2768 out: 2769 sock_put(sk); /* sock_hold above */ 2770 return rc; 2771 } 2772 2773 int smc_getname(struct socket *sock, struct sockaddr *addr, 2774 int peer) 2775 { 2776 struct smc_sock *smc; 2777 2778 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2779 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2780 return -ENOTCONN; 2781 2782 smc = smc_sk(sock->sk); 2783 2784 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2785 } 2786 2787 int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2788 { 2789 struct sock *sk = sock->sk; 2790 struct smc_sock *smc; 2791 int rc; 2792 2793 smc = smc_sk(sk); 2794 lock_sock(sk); 2795 2796 /* SMC does not support connect with fastopen */ 2797 if (msg->msg_flags & MSG_FASTOPEN) { 2798 /* not connected yet, fallback */ 2799 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2800 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2801 if (rc) 2802 goto out; 2803 } else { 2804 rc = -EINVAL; 2805 goto out; 2806 } 2807 } else if ((sk->sk_state != SMC_ACTIVE) && 2808 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2809 (sk->sk_state != SMC_INIT)) { 2810 rc = -EPIPE; 2811 goto out; 2812 } 2813 2814 if (smc->use_fallback) { 2815 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2816 } else { 2817 rc = smc_tx_sendmsg(smc, msg, len); 2818 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2819 } 2820 out: 2821 release_sock(sk); 2822 return rc; 2823 } 2824 2825 int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2826 int flags) 2827 { 2828 struct sock *sk = sock->sk; 2829 struct smc_sock *smc; 2830 int rc = -ENOTCONN; 2831 2832 smc = smc_sk(sk); 2833 lock_sock(sk); 2834 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2835 /* socket was connected before, no more data to read */ 2836 rc = 0; 2837 goto out; 2838 } 2839 if ((sk->sk_state == SMC_INIT) || 2840 (sk->sk_state == SMC_LISTEN) || 2841 (sk->sk_state == SMC_CLOSED)) 2842 goto out; 2843 2844 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2845 rc = 0; 2846 goto out; 2847 } 2848 2849 if (smc->use_fallback) { 2850 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2851 } else { 2852 msg->msg_namelen = 0; 2853 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2854 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2855 } 2856 2857 out: 2858 release_sock(sk); 2859 return rc; 2860 } 2861 2862 static __poll_t smc_accept_poll(struct sock *parent) 2863 { 2864 struct smc_sock *isk = smc_sk(parent); 2865 __poll_t mask = 0; 2866 2867 spin_lock(&isk->accept_q_lock); 2868 if (!list_empty(&isk->accept_q)) 2869 mask = EPOLLIN | EPOLLRDNORM; 2870 spin_unlock(&isk->accept_q_lock); 2871 2872 return mask; 2873 } 2874 2875 __poll_t smc_poll(struct file *file, struct socket *sock, 2876 poll_table *wait) 2877 { 2878 struct sock *sk = sock->sk; 2879 struct smc_sock *smc; 2880 __poll_t mask = 0; 2881 2882 if (!sk) 2883 return EPOLLNVAL; 2884 2885 smc = smc_sk(sock->sk); 2886 if (smc->use_fallback) { 2887 /* delegate to CLC child sock */ 2888 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2889 sk->sk_err = smc->clcsock->sk->sk_err; 2890 } else { 2891 if (sk->sk_state != SMC_CLOSED) 2892 sock_poll_wait(file, sock, wait); 2893 if (sk->sk_err) 2894 mask |= EPOLLERR; 2895 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2896 (sk->sk_state == SMC_CLOSED)) 2897 mask |= EPOLLHUP; 2898 if (sk->sk_state == SMC_LISTEN) { 2899 /* woken up by sk_data_ready in smc_listen_work() */ 2900 mask |= smc_accept_poll(sk); 2901 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2902 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2903 wait); 2904 sk->sk_err = smc->clcsock->sk->sk_err; 2905 } else { 2906 if ((sk->sk_state != SMC_INIT && 2907 atomic_read(&smc->conn.sndbuf_space)) || 2908 sk->sk_shutdown & SEND_SHUTDOWN) { 2909 mask |= EPOLLOUT | EPOLLWRNORM; 2910 } else { 2911 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2912 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2913 2914 if (sk->sk_state != SMC_INIT) { 2915 /* Race breaker the same way as tcp_poll(). */ 2916 smp_mb__after_atomic(); 2917 if (atomic_read(&smc->conn.sndbuf_space)) 2918 mask |= EPOLLOUT | EPOLLWRNORM; 2919 } 2920 } 2921 if (atomic_read(&smc->conn.bytes_to_rcv)) 2922 mask |= EPOLLIN | EPOLLRDNORM; 2923 if (sk->sk_shutdown & RCV_SHUTDOWN) 2924 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2925 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2926 mask |= EPOLLIN; 2927 if (smc->conn.urg_state == SMC_URG_VALID) 2928 mask |= EPOLLPRI; 2929 } 2930 } 2931 2932 return mask; 2933 } 2934 2935 int smc_shutdown(struct socket *sock, int how) 2936 { 2937 struct sock *sk = sock->sk; 2938 bool do_shutdown = true; 2939 struct smc_sock *smc; 2940 int rc = -EINVAL; 2941 int old_state; 2942 int rc1 = 0; 2943 2944 smc = smc_sk(sk); 2945 2946 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2947 return rc; 2948 2949 lock_sock(sk); 2950 2951 if (sock->state == SS_CONNECTING) { 2952 if (sk->sk_state == SMC_ACTIVE) 2953 sock->state = SS_CONNECTED; 2954 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 || 2955 sk->sk_state == SMC_PEERCLOSEWAIT2 || 2956 sk->sk_state == SMC_APPCLOSEWAIT1 || 2957 sk->sk_state == SMC_APPCLOSEWAIT2 || 2958 sk->sk_state == SMC_APPFINCLOSEWAIT) 2959 sock->state = SS_DISCONNECTING; 2960 } 2961 2962 rc = -ENOTCONN; 2963 if ((sk->sk_state != SMC_ACTIVE) && 2964 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2965 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2966 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2967 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2968 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2969 goto out; 2970 if (smc->use_fallback) { 2971 rc = kernel_sock_shutdown(smc->clcsock, how); 2972 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2973 if (sk->sk_shutdown == SHUTDOWN_MASK) { 2974 sk->sk_state = SMC_CLOSED; 2975 sk->sk_socket->state = SS_UNCONNECTED; 2976 sock_put(sk); 2977 } 2978 goto out; 2979 } 2980 switch (how) { 2981 case SHUT_RDWR: /* shutdown in both directions */ 2982 old_state = sk->sk_state; 2983 rc = smc_close_active(smc); 2984 if (old_state == SMC_ACTIVE && 2985 sk->sk_state == SMC_PEERCLOSEWAIT1) 2986 do_shutdown = false; 2987 break; 2988 case SHUT_WR: 2989 rc = smc_close_shutdown_write(smc); 2990 break; 2991 case SHUT_RD: 2992 rc = 0; 2993 /* nothing more to do because peer is not involved */ 2994 break; 2995 } 2996 if (do_shutdown && smc->clcsock) 2997 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2998 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2999 sk->sk_shutdown |= how + 1; 3000 3001 if (sk->sk_state == SMC_CLOSED) 3002 sock->state = SS_UNCONNECTED; 3003 else 3004 sock->state = SS_DISCONNECTING; 3005 out: 3006 release_sock(sk); 3007 return rc ? rc : rc1; 3008 } 3009 3010 static int __smc_getsockopt(struct socket *sock, int level, int optname, 3011 char __user *optval, int __user *optlen) 3012 { 3013 struct smc_sock *smc; 3014 int val, len; 3015 3016 smc = smc_sk(sock->sk); 3017 3018 if (get_user(len, optlen)) 3019 return -EFAULT; 3020 3021 len = min_t(int, len, sizeof(int)); 3022 3023 if (len < 0) 3024 return -EINVAL; 3025 3026 switch (optname) { 3027 case SMC_LIMIT_HS: 3028 val = smc->limit_smc_hs; 3029 break; 3030 default: 3031 return -EOPNOTSUPP; 3032 } 3033 3034 if (put_user(len, optlen)) 3035 return -EFAULT; 3036 if (copy_to_user(optval, &val, len)) 3037 return -EFAULT; 3038 3039 return 0; 3040 } 3041 3042 static int __smc_setsockopt(struct socket *sock, int level, int optname, 3043 sockptr_t optval, unsigned int optlen) 3044 { 3045 struct sock *sk = sock->sk; 3046 struct smc_sock *smc; 3047 int val, rc; 3048 3049 smc = smc_sk(sk); 3050 3051 lock_sock(sk); 3052 switch (optname) { 3053 case SMC_LIMIT_HS: 3054 if (optlen < sizeof(int)) { 3055 rc = -EINVAL; 3056 break; 3057 } 3058 if (copy_from_sockptr(&val, optval, sizeof(int))) { 3059 rc = -EFAULT; 3060 break; 3061 } 3062 3063 smc->limit_smc_hs = !!val; 3064 rc = 0; 3065 break; 3066 default: 3067 rc = -EOPNOTSUPP; 3068 break; 3069 } 3070 release_sock(sk); 3071 3072 return rc; 3073 } 3074 3075 int smc_setsockopt(struct socket *sock, int level, int optname, 3076 sockptr_t optval, unsigned int optlen) 3077 { 3078 struct sock *sk = sock->sk; 3079 struct smc_sock *smc; 3080 int val, rc; 3081 3082 if (level == SOL_TCP && optname == TCP_ULP) 3083 return -EOPNOTSUPP; 3084 else if (level == SOL_SMC) 3085 return __smc_setsockopt(sock, level, optname, optval, optlen); 3086 3087 smc = smc_sk(sk); 3088 3089 /* generic setsockopts reaching us here always apply to the 3090 * CLC socket 3091 */ 3092 mutex_lock(&smc->clcsock_release_lock); 3093 if (!smc->clcsock) { 3094 mutex_unlock(&smc->clcsock_release_lock); 3095 return -EBADF; 3096 } 3097 if (unlikely(!smc->clcsock->ops->setsockopt)) 3098 rc = -EOPNOTSUPP; 3099 else 3100 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 3101 optval, optlen); 3102 if (smc->clcsock->sk->sk_err) { 3103 sk->sk_err = smc->clcsock->sk->sk_err; 3104 sk_error_report(sk); 3105 } 3106 mutex_unlock(&smc->clcsock_release_lock); 3107 3108 if (optlen < sizeof(int)) 3109 return -EINVAL; 3110 if (copy_from_sockptr(&val, optval, sizeof(int))) 3111 return -EFAULT; 3112 3113 lock_sock(sk); 3114 if (rc || smc->use_fallback) 3115 goto out; 3116 switch (optname) { 3117 case TCP_FASTOPEN: 3118 case TCP_FASTOPEN_CONNECT: 3119 case TCP_FASTOPEN_KEY: 3120 case TCP_FASTOPEN_NO_COOKIE: 3121 /* option not supported by SMC */ 3122 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 3123 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 3124 } else { 3125 rc = -EINVAL; 3126 } 3127 break; 3128 case TCP_NODELAY: 3129 if (sk->sk_state != SMC_INIT && 3130 sk->sk_state != SMC_LISTEN && 3131 sk->sk_state != SMC_CLOSED) { 3132 if (val) { 3133 SMC_STAT_INC(smc, ndly_cnt); 3134 smc_tx_pending(&smc->conn); 3135 cancel_delayed_work(&smc->conn.tx_work); 3136 } 3137 } 3138 break; 3139 case TCP_CORK: 3140 if (sk->sk_state != SMC_INIT && 3141 sk->sk_state != SMC_LISTEN && 3142 sk->sk_state != SMC_CLOSED) { 3143 if (!val) { 3144 SMC_STAT_INC(smc, cork_cnt); 3145 smc_tx_pending(&smc->conn); 3146 cancel_delayed_work(&smc->conn.tx_work); 3147 } 3148 } 3149 break; 3150 case TCP_DEFER_ACCEPT: 3151 smc->sockopt_defer_accept = val; 3152 break; 3153 default: 3154 break; 3155 } 3156 out: 3157 release_sock(sk); 3158 3159 return rc; 3160 } 3161 3162 int smc_getsockopt(struct socket *sock, int level, int optname, 3163 char __user *optval, int __user *optlen) 3164 { 3165 struct smc_sock *smc; 3166 int rc; 3167 3168 if (level == SOL_SMC) 3169 return __smc_getsockopt(sock, level, optname, optval, optlen); 3170 3171 smc = smc_sk(sock->sk); 3172 mutex_lock(&smc->clcsock_release_lock); 3173 if (!smc->clcsock) { 3174 mutex_unlock(&smc->clcsock_release_lock); 3175 return -EBADF; 3176 } 3177 /* socket options apply to the CLC socket */ 3178 if (unlikely(!smc->clcsock->ops->getsockopt)) { 3179 mutex_unlock(&smc->clcsock_release_lock); 3180 return -EOPNOTSUPP; 3181 } 3182 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 3183 optval, optlen); 3184 mutex_unlock(&smc->clcsock_release_lock); 3185 return rc; 3186 } 3187 3188 int smc_ioctl(struct socket *sock, unsigned int cmd, 3189 unsigned long arg) 3190 { 3191 union smc_host_cursor cons, urg; 3192 struct smc_connection *conn; 3193 struct smc_sock *smc; 3194 int answ; 3195 3196 smc = smc_sk(sock->sk); 3197 conn = &smc->conn; 3198 lock_sock(&smc->sk); 3199 if (smc->use_fallback) { 3200 if (!smc->clcsock) { 3201 release_sock(&smc->sk); 3202 return -EBADF; 3203 } 3204 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 3205 release_sock(&smc->sk); 3206 return answ; 3207 } 3208 switch (cmd) { 3209 case SIOCINQ: /* same as FIONREAD */ 3210 if (smc->sk.sk_state == SMC_LISTEN) { 3211 release_sock(&smc->sk); 3212 return -EINVAL; 3213 } 3214 if (smc->sk.sk_state == SMC_INIT || 3215 smc->sk.sk_state == SMC_CLOSED) 3216 answ = 0; 3217 else 3218 answ = atomic_read(&smc->conn.bytes_to_rcv); 3219 break; 3220 case SIOCOUTQ: 3221 /* output queue size (not send + not acked) */ 3222 if (smc->sk.sk_state == SMC_LISTEN) { 3223 release_sock(&smc->sk); 3224 return -EINVAL; 3225 } 3226 if (smc->sk.sk_state == SMC_INIT || 3227 smc->sk.sk_state == SMC_CLOSED) 3228 answ = 0; 3229 else 3230 answ = smc->conn.sndbuf_desc->len - 3231 atomic_read(&smc->conn.sndbuf_space); 3232 break; 3233 case SIOCOUTQNSD: 3234 /* output queue size (not send only) */ 3235 if (smc->sk.sk_state == SMC_LISTEN) { 3236 release_sock(&smc->sk); 3237 return -EINVAL; 3238 } 3239 if (smc->sk.sk_state == SMC_INIT || 3240 smc->sk.sk_state == SMC_CLOSED) 3241 answ = 0; 3242 else 3243 answ = smc_tx_prepared_sends(&smc->conn); 3244 break; 3245 case SIOCATMARK: 3246 if (smc->sk.sk_state == SMC_LISTEN) { 3247 release_sock(&smc->sk); 3248 return -EINVAL; 3249 } 3250 if (smc->sk.sk_state == SMC_INIT || 3251 smc->sk.sk_state == SMC_CLOSED) { 3252 answ = 0; 3253 } else { 3254 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 3255 smc_curs_copy(&urg, &conn->urg_curs, conn); 3256 answ = smc_curs_diff(conn->rmb_desc->len, 3257 &cons, &urg) == 1; 3258 } 3259 break; 3260 default: 3261 release_sock(&smc->sk); 3262 return -ENOIOCTLCMD; 3263 } 3264 release_sock(&smc->sk); 3265 3266 return put_user(answ, (int __user *)arg); 3267 } 3268 3269 /* Map the affected portions of the rmbe into an spd, note the number of bytes 3270 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 3271 * updates till whenever a respective page has been fully processed. 3272 * Note that subsequent recv() calls have to wait till all splice() processing 3273 * completed. 3274 */ 3275 ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 3276 struct pipe_inode_info *pipe, size_t len, 3277 unsigned int flags) 3278 { 3279 struct sock *sk = sock->sk; 3280 struct smc_sock *smc; 3281 int rc = -ENOTCONN; 3282 3283 smc = smc_sk(sk); 3284 lock_sock(sk); 3285 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 3286 /* socket was connected before, no more data to read */ 3287 rc = 0; 3288 goto out; 3289 } 3290 if (sk->sk_state == SMC_INIT || 3291 sk->sk_state == SMC_LISTEN || 3292 sk->sk_state == SMC_CLOSED) 3293 goto out; 3294 3295 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 3296 rc = 0; 3297 goto out; 3298 } 3299 3300 if (smc->use_fallback) { 3301 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 3302 pipe, len, flags); 3303 } else { 3304 if (*ppos) { 3305 rc = -ESPIPE; 3306 goto out; 3307 } 3308 if (flags & SPLICE_F_NONBLOCK) 3309 flags = MSG_DONTWAIT; 3310 else 3311 flags = 0; 3312 SMC_STAT_INC(smc, splice_cnt); 3313 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 3314 } 3315 out: 3316 release_sock(sk); 3317 3318 return rc; 3319 } 3320 3321 /* must look like tcp */ 3322 static const struct proto_ops smc_sock_ops = { 3323 .family = PF_SMC, 3324 .owner = THIS_MODULE, 3325 .release = smc_release, 3326 .bind = smc_bind, 3327 .connect = smc_connect, 3328 .socketpair = sock_no_socketpair, 3329 .accept = smc_accept, 3330 .getname = smc_getname, 3331 .poll = smc_poll, 3332 .ioctl = smc_ioctl, 3333 .listen = smc_listen, 3334 .shutdown = smc_shutdown, 3335 .setsockopt = smc_setsockopt, 3336 .getsockopt = smc_getsockopt, 3337 .sendmsg = smc_sendmsg, 3338 .recvmsg = smc_recvmsg, 3339 .mmap = sock_no_mmap, 3340 .splice_read = smc_splice_read, 3341 }; 3342 3343 int smc_create_clcsk(struct net *net, struct sock *sk, int family) 3344 { 3345 struct smc_sock *smc = smc_sk(sk); 3346 int rc; 3347 3348 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 3349 &smc->clcsock); 3350 if (rc) 3351 return rc; 3352 3353 /* smc_clcsock_release() does not wait smc->clcsock->sk's 3354 * destruction; its sk_state might not be TCP_CLOSE after 3355 * smc->sk is close()d, and TCP timers can be fired later, 3356 * which need net ref. 3357 */ 3358 sk = smc->clcsock->sk; 3359 sk_net_refcnt_upgrade(sk); 3360 return 0; 3361 } 3362 3363 static int __smc_create(struct net *net, struct socket *sock, int protocol, 3364 int kern, struct socket *clcsock) 3365 { 3366 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 3367 struct smc_sock *smc; 3368 struct sock *sk; 3369 int rc; 3370 3371 rc = -ESOCKTNOSUPPORT; 3372 if (sock->type != SOCK_STREAM) 3373 goto out; 3374 3375 rc = -EPROTONOSUPPORT; 3376 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 3377 goto out; 3378 3379 rc = -ENOBUFS; 3380 sock->ops = &smc_sock_ops; 3381 sock->state = SS_UNCONNECTED; 3382 sk = smc_sock_alloc(net, sock, protocol); 3383 if (!sk) 3384 goto out; 3385 3386 /* create internal TCP socket for CLC handshake and fallback */ 3387 smc = smc_sk(sk); 3388 3389 rc = 0; 3390 if (clcsock) 3391 smc->clcsock = clcsock; 3392 else 3393 rc = smc_create_clcsk(net, sk, family); 3394 3395 if (rc) { 3396 sk_common_release(sk); 3397 sock->sk = NULL; 3398 } 3399 out: 3400 return rc; 3401 } 3402 3403 static int smc_create(struct net *net, struct socket *sock, int protocol, 3404 int kern) 3405 { 3406 return __smc_create(net, sock, protocol, kern, NULL); 3407 } 3408 3409 static const struct net_proto_family smc_sock_family_ops = { 3410 .family = PF_SMC, 3411 .owner = THIS_MODULE, 3412 .create = smc_create, 3413 }; 3414 3415 static int smc_ulp_init(struct sock *sk) 3416 { 3417 struct socket *tcp = sk->sk_socket; 3418 struct net *net = sock_net(sk); 3419 struct socket *smcsock; 3420 int protocol, ret; 3421 3422 /* only TCP can be replaced */ 3423 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 3424 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 3425 return -ESOCKTNOSUPPORT; 3426 /* don't handle wq now */ 3427 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 3428 return -ENOTCONN; 3429 3430 if (sk->sk_family == AF_INET) 3431 protocol = SMCPROTO_SMC; 3432 else 3433 protocol = SMCPROTO_SMC6; 3434 3435 smcsock = sock_alloc(); 3436 if (!smcsock) 3437 return -ENFILE; 3438 3439 smcsock->type = SOCK_STREAM; 3440 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 3441 ret = __smc_create(net, smcsock, protocol, 1, tcp); 3442 if (ret) { 3443 sock_release(smcsock); /* module_put() which ops won't be NULL */ 3444 return ret; 3445 } 3446 3447 /* replace tcp socket to smc */ 3448 smcsock->file = tcp->file; 3449 smcsock->file->private_data = smcsock; 3450 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 3451 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 3452 tcp->file = NULL; 3453 3454 return ret; 3455 } 3456 3457 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 3458 const gfp_t priority) 3459 { 3460 struct inet_connection_sock *icsk = inet_csk(newsk); 3461 3462 /* don't inherit ulp ops to child when listen */ 3463 icsk->icsk_ulp_ops = NULL; 3464 } 3465 3466 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 3467 .name = "smc", 3468 .owner = THIS_MODULE, 3469 .init = smc_ulp_init, 3470 .clone = smc_ulp_clone, 3471 }; 3472 3473 unsigned int smc_net_id; 3474 3475 static __net_init int smc_net_init(struct net *net) 3476 { 3477 int rc; 3478 3479 rc = smc_sysctl_net_init(net); 3480 if (rc) 3481 return rc; 3482 return smc_pnet_net_init(net); 3483 } 3484 3485 static void __net_exit smc_net_exit(struct net *net) 3486 { 3487 smc_sysctl_net_exit(net); 3488 smc_pnet_net_exit(net); 3489 } 3490 3491 static __net_init int smc_net_stat_init(struct net *net) 3492 { 3493 return smc_stats_init(net); 3494 } 3495 3496 static void __net_exit smc_net_stat_exit(struct net *net) 3497 { 3498 smc_stats_exit(net); 3499 } 3500 3501 static struct pernet_operations smc_net_ops = { 3502 .init = smc_net_init, 3503 .exit = smc_net_exit, 3504 .id = &smc_net_id, 3505 .size = sizeof(struct smc_net), 3506 }; 3507 3508 static struct pernet_operations smc_net_stat_ops = { 3509 .init = smc_net_stat_init, 3510 .exit = smc_net_stat_exit, 3511 }; 3512 3513 static int __init smc_init(void) 3514 { 3515 int rc; 3516 3517 rc = register_pernet_subsys(&smc_net_ops); 3518 if (rc) 3519 return rc; 3520 3521 rc = register_pernet_subsys(&smc_net_stat_ops); 3522 if (rc) 3523 goto out_pernet_subsys; 3524 3525 rc = smc_ism_init(); 3526 if (rc) 3527 goto out_pernet_subsys_stat; 3528 smc_clc_init(); 3529 3530 rc = smc_nl_init(); 3531 if (rc) 3532 goto out_ism; 3533 3534 rc = smc_pnet_init(); 3535 if (rc) 3536 goto out_nl; 3537 3538 rc = -ENOMEM; 3539 3540 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0); 3541 if (!smc_tcp_ls_wq) 3542 goto out_pnet; 3543 3544 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 3545 if (!smc_hs_wq) 3546 goto out_alloc_tcp_ls_wq; 3547 3548 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 3549 if (!smc_close_wq) 3550 goto out_alloc_hs_wq; 3551 3552 rc = smc_core_init(); 3553 if (rc) { 3554 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 3555 goto out_alloc_wqs; 3556 } 3557 3558 rc = smc_llc_init(); 3559 if (rc) { 3560 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 3561 goto out_core; 3562 } 3563 3564 rc = smc_cdc_init(); 3565 if (rc) { 3566 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 3567 goto out_core; 3568 } 3569 3570 rc = proto_register(&smc_proto, 1); 3571 if (rc) { 3572 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 3573 goto out_core; 3574 } 3575 3576 rc = proto_register(&smc_proto6, 1); 3577 if (rc) { 3578 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 3579 goto out_proto; 3580 } 3581 3582 rc = sock_register(&smc_sock_family_ops); 3583 if (rc) { 3584 pr_err("%s: sock_register fails with %d\n", __func__, rc); 3585 goto out_proto6; 3586 } 3587 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 3588 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 3589 3590 rc = smc_ib_register_client(); 3591 if (rc) { 3592 pr_err("%s: ib_register fails with %d\n", __func__, rc); 3593 goto out_sock; 3594 } 3595 3596 rc = smc_loopback_init(); 3597 if (rc) { 3598 pr_err("%s: smc_loopback_init fails with %d\n", __func__, rc); 3599 goto out_ib; 3600 } 3601 3602 rc = tcp_register_ulp(&smc_ulp_ops); 3603 if (rc) { 3604 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 3605 goto out_lo; 3606 } 3607 rc = smc_inet_init(); 3608 if (rc) { 3609 pr_err("%s: smc_inet_init fails with %d\n", __func__, rc); 3610 goto out_ulp; 3611 } 3612 static_branch_enable(&tcp_have_smc); 3613 return 0; 3614 out_ulp: 3615 tcp_unregister_ulp(&smc_ulp_ops); 3616 out_lo: 3617 smc_loopback_exit(); 3618 out_ib: 3619 smc_ib_unregister_client(); 3620 out_sock: 3621 sock_unregister(PF_SMC); 3622 out_proto6: 3623 proto_unregister(&smc_proto6); 3624 out_proto: 3625 proto_unregister(&smc_proto); 3626 out_core: 3627 smc_core_exit(); 3628 out_alloc_wqs: 3629 destroy_workqueue(smc_close_wq); 3630 out_alloc_hs_wq: 3631 destroy_workqueue(smc_hs_wq); 3632 out_alloc_tcp_ls_wq: 3633 destroy_workqueue(smc_tcp_ls_wq); 3634 out_pnet: 3635 smc_pnet_exit(); 3636 out_nl: 3637 smc_nl_exit(); 3638 out_ism: 3639 smc_clc_exit(); 3640 smc_ism_exit(); 3641 out_pernet_subsys_stat: 3642 unregister_pernet_subsys(&smc_net_stat_ops); 3643 out_pernet_subsys: 3644 unregister_pernet_subsys(&smc_net_ops); 3645 3646 return rc; 3647 } 3648 3649 static void __exit smc_exit(void) 3650 { 3651 static_branch_disable(&tcp_have_smc); 3652 smc_inet_exit(); 3653 tcp_unregister_ulp(&smc_ulp_ops); 3654 sock_unregister(PF_SMC); 3655 smc_core_exit(); 3656 smc_loopback_exit(); 3657 smc_ib_unregister_client(); 3658 smc_ism_exit(); 3659 destroy_workqueue(smc_close_wq); 3660 destroy_workqueue(smc_tcp_ls_wq); 3661 destroy_workqueue(smc_hs_wq); 3662 proto_unregister(&smc_proto6); 3663 proto_unregister(&smc_proto); 3664 smc_pnet_exit(); 3665 smc_nl_exit(); 3666 smc_clc_exit(); 3667 unregister_pernet_subsys(&smc_net_stat_ops); 3668 unregister_pernet_subsys(&smc_net_ops); 3669 rcu_barrier(); 3670 } 3671 3672 module_init(smc_init); 3673 module_exit(smc_exit); 3674 3675 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3676 MODULE_DESCRIPTION("smc socket address family"); 3677 MODULE_LICENSE("GPL"); 3678 MODULE_ALIAS_NETPROTO(PF_SMC); 3679 MODULE_ALIAS_TCP_ULP("smc"); 3680 /* 256 for IPPROTO_SMC and 1 for SOCK_STREAM */ 3681 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 256, 1); 3682 #if IS_ENABLED(CONFIG_IPV6) 3683 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 256, 1); 3684 #endif /* CONFIG_IPV6 */ 3685 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME); 3686