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/tcp.h> 34 #include <net/smc.h> 35 #include <asm/ioctls.h> 36 37 #include <net/net_namespace.h> 38 #include <net/netns/generic.h> 39 #include "smc_netns.h" 40 41 #include "smc.h" 42 #include "smc_clc.h" 43 #include "smc_llc.h" 44 #include "smc_cdc.h" 45 #include "smc_core.h" 46 #include "smc_ib.h" 47 #include "smc_ism.h" 48 #include "smc_pnet.h" 49 #include "smc_netlink.h" 50 #include "smc_tx.h" 51 #include "smc_rx.h" 52 #include "smc_close.h" 53 #include "smc_stats.h" 54 #include "smc_tracepoint.h" 55 #include "smc_sysctl.h" 56 57 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group 58 * creation on server 59 */ 60 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group 61 * creation on client 62 */ 63 64 static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */ 65 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ 66 struct workqueue_struct *smc_close_wq; /* wq for close work */ 67 68 static void smc_tcp_listen_work(struct work_struct *); 69 static void smc_connect_work(struct work_struct *); 70 71 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb) 72 { 73 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 74 void *hdr; 75 76 if (cb_ctx->pos[0]) 77 goto out; 78 79 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 80 &smc_gen_nl_family, NLM_F_MULTI, 81 SMC_NETLINK_DUMP_HS_LIMITATION); 82 if (!hdr) 83 return -ENOMEM; 84 85 if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED, 86 sock_net(skb->sk)->smc.limit_smc_hs)) 87 goto err; 88 89 genlmsg_end(skb, hdr); 90 cb_ctx->pos[0] = 1; 91 out: 92 return skb->len; 93 err: 94 genlmsg_cancel(skb, hdr); 95 return -EMSGSIZE; 96 } 97 98 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info) 99 { 100 sock_net(skb->sk)->smc.limit_smc_hs = true; 101 return 0; 102 } 103 104 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info) 105 { 106 sock_net(skb->sk)->smc.limit_smc_hs = false; 107 return 0; 108 } 109 110 static void smc_set_keepalive(struct sock *sk, int val) 111 { 112 struct smc_sock *smc = smc_sk(sk); 113 114 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 115 } 116 117 static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, 118 struct sk_buff *skb, 119 struct request_sock *req, 120 struct dst_entry *dst, 121 struct request_sock *req_unhash, 122 bool *own_req) 123 { 124 struct smc_sock *smc; 125 struct sock *child; 126 127 smc = smc_clcsock_user_data(sk); 128 129 if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) > 130 sk->sk_max_ack_backlog) 131 goto drop; 132 133 if (sk_acceptq_is_full(&smc->sk)) { 134 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); 135 goto drop; 136 } 137 138 /* passthrough to original syn recv sock fct */ 139 child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash, 140 own_req); 141 /* child must not inherit smc or its ops */ 142 if (child) { 143 rcu_assign_sk_user_data(child, NULL); 144 145 /* v4-mapped sockets don't inherit parent ops. Don't restore. */ 146 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops) 147 inet_csk(child)->icsk_af_ops = smc->ori_af_ops; 148 } 149 return child; 150 151 drop: 152 dst_release(dst); 153 tcp_listendrop(sk); 154 return NULL; 155 } 156 157 static bool smc_hs_congested(const struct sock *sk) 158 { 159 const struct smc_sock *smc; 160 161 smc = smc_clcsock_user_data(sk); 162 163 if (!smc) 164 return true; 165 166 if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) 167 return true; 168 169 return false; 170 } 171 172 static struct smc_hashinfo smc_v4_hashinfo = { 173 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 174 }; 175 176 static struct smc_hashinfo smc_v6_hashinfo = { 177 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 178 }; 179 180 int smc_hash_sk(struct sock *sk) 181 { 182 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 183 struct hlist_head *head; 184 185 head = &h->ht; 186 187 write_lock_bh(&h->lock); 188 sk_add_node(sk, head); 189 write_unlock_bh(&h->lock); 190 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 191 192 return 0; 193 } 194 EXPORT_SYMBOL_GPL(smc_hash_sk); 195 196 void smc_unhash_sk(struct sock *sk) 197 { 198 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 199 200 write_lock_bh(&h->lock); 201 if (sk_del_node_init(sk)) 202 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 203 write_unlock_bh(&h->lock); 204 } 205 EXPORT_SYMBOL_GPL(smc_unhash_sk); 206 207 /* This will be called before user really release sock_lock. So do the 208 * work which we didn't do because of user hold the sock_lock in the 209 * BH context 210 */ 211 static void smc_release_cb(struct sock *sk) 212 { 213 struct smc_sock *smc = smc_sk(sk); 214 215 if (smc->conn.tx_in_release_sock) { 216 smc_tx_pending(&smc->conn); 217 smc->conn.tx_in_release_sock = false; 218 } 219 } 220 221 struct proto smc_proto = { 222 .name = "SMC", 223 .owner = THIS_MODULE, 224 .keepalive = smc_set_keepalive, 225 .hash = smc_hash_sk, 226 .unhash = smc_unhash_sk, 227 .release_cb = smc_release_cb, 228 .obj_size = sizeof(struct smc_sock), 229 .h.smc_hash = &smc_v4_hashinfo, 230 .slab_flags = SLAB_TYPESAFE_BY_RCU, 231 }; 232 EXPORT_SYMBOL_GPL(smc_proto); 233 234 struct proto smc_proto6 = { 235 .name = "SMC6", 236 .owner = THIS_MODULE, 237 .keepalive = smc_set_keepalive, 238 .hash = smc_hash_sk, 239 .unhash = smc_unhash_sk, 240 .release_cb = smc_release_cb, 241 .obj_size = sizeof(struct smc_sock), 242 .h.smc_hash = &smc_v6_hashinfo, 243 .slab_flags = SLAB_TYPESAFE_BY_RCU, 244 }; 245 EXPORT_SYMBOL_GPL(smc_proto6); 246 247 static void smc_fback_restore_callbacks(struct smc_sock *smc) 248 { 249 struct sock *clcsk = smc->clcsock->sk; 250 251 write_lock_bh(&clcsk->sk_callback_lock); 252 clcsk->sk_user_data = NULL; 253 254 smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change); 255 smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready); 256 smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space); 257 smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report); 258 259 write_unlock_bh(&clcsk->sk_callback_lock); 260 } 261 262 static void smc_restore_fallback_changes(struct smc_sock *smc) 263 { 264 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ 265 smc->clcsock->file->private_data = smc->sk.sk_socket; 266 smc->clcsock->file = NULL; 267 smc_fback_restore_callbacks(smc); 268 } 269 } 270 271 static int __smc_release(struct smc_sock *smc) 272 { 273 struct sock *sk = &smc->sk; 274 int rc = 0; 275 276 if (!smc->use_fallback) { 277 rc = smc_close_active(smc); 278 sock_set_flag(sk, SOCK_DEAD); 279 sk->sk_shutdown |= SHUTDOWN_MASK; 280 } else { 281 if (sk->sk_state != SMC_CLOSED) { 282 if (sk->sk_state != SMC_LISTEN && 283 sk->sk_state != SMC_INIT) 284 sock_put(sk); /* passive closing */ 285 if (sk->sk_state == SMC_LISTEN) { 286 /* wake up clcsock accept */ 287 rc = kernel_sock_shutdown(smc->clcsock, 288 SHUT_RDWR); 289 } 290 sk->sk_state = SMC_CLOSED; 291 sk->sk_state_change(sk); 292 } 293 smc_restore_fallback_changes(smc); 294 } 295 296 sk->sk_prot->unhash(sk); 297 298 if (sk->sk_state == SMC_CLOSED) { 299 if (smc->clcsock) { 300 release_sock(sk); 301 smc_clcsock_release(smc); 302 lock_sock(sk); 303 } 304 if (!smc->use_fallback) 305 smc_conn_free(&smc->conn); 306 } 307 308 return rc; 309 } 310 311 static int smc_release(struct socket *sock) 312 { 313 struct sock *sk = sock->sk; 314 struct smc_sock *smc; 315 int old_state, rc = 0; 316 317 if (!sk) 318 goto out; 319 320 sock_hold(sk); /* sock_put below */ 321 smc = smc_sk(sk); 322 323 old_state = sk->sk_state; 324 325 /* cleanup for a dangling non-blocking connect */ 326 if (smc->connect_nonblock && old_state == SMC_INIT) 327 tcp_abort(smc->clcsock->sk, ECONNABORTED); 328 329 if (cancel_work_sync(&smc->connect_work)) 330 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */ 331 332 if (sk->sk_state == SMC_LISTEN) 333 /* smc_close_non_accepted() is called and acquires 334 * sock lock for child sockets again 335 */ 336 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 337 else 338 lock_sock(sk); 339 340 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE && 341 !smc->use_fallback) 342 smc_close_active_abort(smc); 343 344 rc = __smc_release(smc); 345 346 /* detach socket */ 347 sock_orphan(sk); 348 sock->sk = NULL; 349 release_sock(sk); 350 351 sock_put(sk); /* sock_hold above */ 352 sock_put(sk); /* final sock_put */ 353 out: 354 return rc; 355 } 356 357 static void smc_destruct(struct sock *sk) 358 { 359 if (sk->sk_state != SMC_CLOSED) 360 return; 361 if (!sock_flag(sk, SOCK_DEAD)) 362 return; 363 } 364 365 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 366 int protocol) 367 { 368 struct smc_sock *smc; 369 struct proto *prot; 370 struct sock *sk; 371 372 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 373 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 374 if (!sk) 375 return NULL; 376 377 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 378 sk->sk_state = SMC_INIT; 379 sk->sk_destruct = smc_destruct; 380 sk->sk_protocol = protocol; 381 WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem)); 382 WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem)); 383 smc = smc_sk(sk); 384 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 385 INIT_WORK(&smc->connect_work, smc_connect_work); 386 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 387 INIT_LIST_HEAD(&smc->accept_q); 388 spin_lock_init(&smc->accept_q_lock); 389 spin_lock_init(&smc->conn.send_lock); 390 sk->sk_prot->hash(sk); 391 mutex_init(&smc->clcsock_release_lock); 392 smc_init_saved_callbacks(smc); 393 394 return sk; 395 } 396 397 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 398 int addr_len) 399 { 400 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 401 struct sock *sk = sock->sk; 402 struct smc_sock *smc; 403 int rc; 404 405 smc = smc_sk(sk); 406 407 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 408 rc = -EINVAL; 409 if (addr_len < sizeof(struct sockaddr_in)) 410 goto out; 411 412 rc = -EAFNOSUPPORT; 413 if (addr->sin_family != AF_INET && 414 addr->sin_family != AF_INET6 && 415 addr->sin_family != AF_UNSPEC) 416 goto out; 417 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 418 if (addr->sin_family == AF_UNSPEC && 419 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 420 goto out; 421 422 lock_sock(sk); 423 424 /* Check if socket is already active */ 425 rc = -EINVAL; 426 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 427 goto out_rel; 428 429 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 430 smc->clcsock->sk->sk_reuseport = sk->sk_reuseport; 431 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 432 433 out_rel: 434 release_sock(sk); 435 out: 436 return rc; 437 } 438 439 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 440 * clc socket (since smc is not called for these options from net/core) 441 */ 442 443 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 444 (1UL << SOCK_KEEPOPEN) | \ 445 (1UL << SOCK_LINGER) | \ 446 (1UL << SOCK_BROADCAST) | \ 447 (1UL << SOCK_TIMESTAMP) | \ 448 (1UL << SOCK_DBG) | \ 449 (1UL << SOCK_RCVTSTAMP) | \ 450 (1UL << SOCK_RCVTSTAMPNS) | \ 451 (1UL << SOCK_LOCALROUTE) | \ 452 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 453 (1UL << SOCK_RXQ_OVFL) | \ 454 (1UL << SOCK_WIFI_STATUS) | \ 455 (1UL << SOCK_NOFCS) | \ 456 (1UL << SOCK_FILTER_LOCKED) | \ 457 (1UL << SOCK_TSTAMP_NEW)) 458 459 /* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */ 460 static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk, 461 unsigned long mask) 462 { 463 struct net *nnet = sock_net(nsk); 464 465 nsk->sk_userlocks = osk->sk_userlocks; 466 if (osk->sk_userlocks & SOCK_SNDBUF_LOCK) { 467 nsk->sk_sndbuf = osk->sk_sndbuf; 468 } else { 469 if (mask == SK_FLAGS_SMC_TO_CLC) 470 WRITE_ONCE(nsk->sk_sndbuf, 471 READ_ONCE(nnet->ipv4.sysctl_tcp_wmem[1])); 472 else 473 WRITE_ONCE(nsk->sk_sndbuf, 474 2 * READ_ONCE(nnet->smc.sysctl_wmem)); 475 } 476 if (osk->sk_userlocks & SOCK_RCVBUF_LOCK) { 477 nsk->sk_rcvbuf = osk->sk_rcvbuf; 478 } else { 479 if (mask == SK_FLAGS_SMC_TO_CLC) 480 WRITE_ONCE(nsk->sk_rcvbuf, 481 READ_ONCE(nnet->ipv4.sysctl_tcp_rmem[1])); 482 else 483 WRITE_ONCE(nsk->sk_rcvbuf, 484 2 * READ_ONCE(nnet->smc.sysctl_rmem)); 485 } 486 } 487 488 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 489 unsigned long mask) 490 { 491 /* options we don't get control via setsockopt for */ 492 nsk->sk_type = osk->sk_type; 493 nsk->sk_sndtimeo = osk->sk_sndtimeo; 494 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 495 nsk->sk_mark = READ_ONCE(osk->sk_mark); 496 nsk->sk_priority = osk->sk_priority; 497 nsk->sk_rcvlowat = osk->sk_rcvlowat; 498 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 499 nsk->sk_err = osk->sk_err; 500 501 nsk->sk_flags &= ~mask; 502 nsk->sk_flags |= osk->sk_flags & mask; 503 504 smc_adjust_sock_bufsizes(nsk, osk, mask); 505 } 506 507 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 508 { 509 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 510 } 511 512 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 513 (1UL << SOCK_KEEPOPEN) | \ 514 (1UL << SOCK_LINGER) | \ 515 (1UL << SOCK_DBG)) 516 /* copy only settings and flags relevant for smc from clc to smc socket */ 517 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 518 { 519 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 520 } 521 522 /* register the new vzalloced sndbuf on all links */ 523 static int smcr_lgr_reg_sndbufs(struct smc_link *link, 524 struct smc_buf_desc *snd_desc) 525 { 526 struct smc_link_group *lgr = link->lgr; 527 int i, rc = 0; 528 529 if (!snd_desc->is_vm) 530 return -EINVAL; 531 532 /* protect against parallel smcr_link_reg_buf() */ 533 down_write(&lgr->llc_conf_mutex); 534 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 535 if (!smc_link_active(&lgr->lnk[i])) 536 continue; 537 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc); 538 if (rc) 539 break; 540 } 541 up_write(&lgr->llc_conf_mutex); 542 return rc; 543 } 544 545 /* register the new rmb on all links */ 546 static int smcr_lgr_reg_rmbs(struct smc_link *link, 547 struct smc_buf_desc *rmb_desc) 548 { 549 struct smc_link_group *lgr = link->lgr; 550 bool do_slow = false; 551 int i, rc = 0; 552 553 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 554 if (rc) 555 return rc; 556 557 down_read(&lgr->llc_conf_mutex); 558 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 559 if (!smc_link_active(&lgr->lnk[i])) 560 continue; 561 if (!rmb_desc->is_reg_mr[link->link_idx]) { 562 up_read(&lgr->llc_conf_mutex); 563 goto slow_path; 564 } 565 } 566 /* mr register already */ 567 goto fast_path; 568 slow_path: 569 do_slow = true; 570 /* protect against parallel smc_llc_cli_rkey_exchange() and 571 * parallel smcr_link_reg_buf() 572 */ 573 down_write(&lgr->llc_conf_mutex); 574 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 575 if (!smc_link_active(&lgr->lnk[i])) 576 continue; 577 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc); 578 if (rc) 579 goto out; 580 } 581 fast_path: 582 /* exchange confirm_rkey msg with peer */ 583 rc = smc_llc_do_confirm_rkey(link, rmb_desc); 584 if (rc) { 585 rc = -EFAULT; 586 goto out; 587 } 588 rmb_desc->is_conf_rkey = true; 589 out: 590 do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex); 591 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 592 return rc; 593 } 594 595 static int smcr_clnt_conf_first_link(struct smc_sock *smc) 596 { 597 struct smc_link *link = smc->conn.lnk; 598 struct smc_llc_qentry *qentry; 599 int rc; 600 601 /* receive CONFIRM LINK request from server over RoCE fabric */ 602 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 603 SMC_LLC_CONFIRM_LINK); 604 if (!qentry) { 605 struct smc_clc_msg_decline dclc; 606 607 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 608 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 609 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 610 } 611 smc_llc_save_peer_uid(qentry); 612 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); 613 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 614 if (rc) 615 return SMC_CLC_DECL_RMBE_EC; 616 617 rc = smc_ib_modify_qp_rts(link); 618 if (rc) 619 return SMC_CLC_DECL_ERR_RDYLNK; 620 621 smc_wr_remember_qp_attr(link); 622 623 /* reg the sndbuf if it was vzalloced */ 624 if (smc->conn.sndbuf_desc->is_vm) { 625 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) 626 return SMC_CLC_DECL_ERR_REGBUF; 627 } 628 629 /* reg the rmb */ 630 if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) 631 return SMC_CLC_DECL_ERR_REGBUF; 632 633 /* confirm_rkey is implicit on 1st contact */ 634 smc->conn.rmb_desc->is_conf_rkey = true; 635 636 /* send CONFIRM LINK response over RoCE fabric */ 637 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 638 if (rc < 0) 639 return SMC_CLC_DECL_TIMEOUT_CL; 640 641 smc_llc_link_active(link); 642 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 643 644 if (link->lgr->max_links > 1) { 645 /* optional 2nd link, receive ADD LINK request from server */ 646 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 647 SMC_LLC_ADD_LINK); 648 if (!qentry) { 649 struct smc_clc_msg_decline dclc; 650 651 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 652 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 653 if (rc == -EAGAIN) 654 rc = 0; /* no DECLINE received, go with one link */ 655 return rc; 656 } 657 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); 658 smc_llc_cli_add_link(link, qentry); 659 } 660 return 0; 661 } 662 663 static bool smc_isascii(char *hostname) 664 { 665 int i; 666 667 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) 668 if (!isascii(hostname[i])) 669 return false; 670 return true; 671 } 672 673 static void smc_conn_save_peer_info_fce(struct smc_sock *smc, 674 struct smc_clc_msg_accept_confirm *clc) 675 { 676 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 677 (struct smc_clc_msg_accept_confirm_v2 *)clc; 678 struct smc_clc_first_contact_ext *fce; 679 int clc_v2_len; 680 681 if (clc->hdr.version == SMC_V1 || 682 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 683 return; 684 685 if (smc->conn.lgr->is_smcd) { 686 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid, 687 SMC_MAX_EID_LEN); 688 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 689 d1); 690 } else { 691 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid, 692 SMC_MAX_EID_LEN); 693 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 694 r1); 695 } 696 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len); 697 smc->conn.lgr->peer_os = fce->os_type; 698 smc->conn.lgr->peer_smc_release = fce->release; 699 if (smc_isascii(fce->hostname)) 700 memcpy(smc->conn.lgr->peer_hostname, fce->hostname, 701 SMC_MAX_HOSTNAME_LEN); 702 } 703 704 static void smcr_conn_save_peer_info(struct smc_sock *smc, 705 struct smc_clc_msg_accept_confirm *clc) 706 { 707 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); 708 709 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; 710 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); 711 smc->conn.peer_rmbe_size = bufsize; 712 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 713 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 714 } 715 716 static void smcd_conn_save_peer_info(struct smc_sock *smc, 717 struct smc_clc_msg_accept_confirm *clc) 718 { 719 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); 720 721 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; 722 smc->conn.peer_token = clc->d0.token; 723 /* msg header takes up space in the buffer */ 724 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 725 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 726 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 727 } 728 729 static void smc_conn_save_peer_info(struct smc_sock *smc, 730 struct smc_clc_msg_accept_confirm *clc) 731 { 732 if (smc->conn.lgr->is_smcd) 733 smcd_conn_save_peer_info(smc, clc); 734 else 735 smcr_conn_save_peer_info(smc, clc); 736 smc_conn_save_peer_info_fce(smc, clc); 737 } 738 739 static void smc_link_save_peer_info(struct smc_link *link, 740 struct smc_clc_msg_accept_confirm *clc, 741 struct smc_init_info *ini) 742 { 743 link->peer_qpn = ntoh24(clc->r0.qpn); 744 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE); 745 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac)); 746 link->peer_psn = ntoh24(clc->r0.psn); 747 link->peer_mtu = clc->r0.qp_mtu; 748 } 749 750 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc, 751 struct smc_stats_fback *fback_arr) 752 { 753 int cnt; 754 755 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) { 756 if (fback_arr[cnt].fback_code == smc->fallback_rsn) { 757 fback_arr[cnt].count++; 758 break; 759 } 760 if (!fback_arr[cnt].fback_code) { 761 fback_arr[cnt].fback_code = smc->fallback_rsn; 762 fback_arr[cnt].count++; 763 break; 764 } 765 } 766 } 767 768 static void smc_stat_fallback(struct smc_sock *smc) 769 { 770 struct net *net = sock_net(&smc->sk); 771 772 mutex_lock(&net->smc.mutex_fback_rsn); 773 if (smc->listen_smc) { 774 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv); 775 net->smc.fback_rsn->srv_fback_cnt++; 776 } else { 777 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt); 778 net->smc.fback_rsn->clnt_fback_cnt++; 779 } 780 mutex_unlock(&net->smc.mutex_fback_rsn); 781 } 782 783 /* must be called under rcu read lock */ 784 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key) 785 { 786 struct socket_wq *wq; 787 __poll_t flags; 788 789 wq = rcu_dereference(smc->sk.sk_wq); 790 if (!skwq_has_sleeper(wq)) 791 return; 792 793 /* wake up smc sk->sk_wq */ 794 if (!key) { 795 /* sk_state_change */ 796 wake_up_interruptible_all(&wq->wait); 797 } else { 798 flags = key_to_poll(key); 799 if (flags & (EPOLLIN | EPOLLOUT)) 800 /* sk_data_ready or sk_write_space */ 801 wake_up_interruptible_sync_poll(&wq->wait, flags); 802 else if (flags & EPOLLERR) 803 /* sk_error_report */ 804 wake_up_interruptible_poll(&wq->wait, flags); 805 } 806 } 807 808 static int smc_fback_mark_woken(wait_queue_entry_t *wait, 809 unsigned int mode, int sync, void *key) 810 { 811 struct smc_mark_woken *mark = 812 container_of(wait, struct smc_mark_woken, wait_entry); 813 814 mark->woken = true; 815 mark->key = key; 816 return 0; 817 } 818 819 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk, 820 void (*clcsock_callback)(struct sock *sk)) 821 { 822 struct smc_mark_woken mark = { .woken = false }; 823 struct socket_wq *wq; 824 825 init_waitqueue_func_entry(&mark.wait_entry, 826 smc_fback_mark_woken); 827 rcu_read_lock(); 828 wq = rcu_dereference(clcsk->sk_wq); 829 if (!wq) 830 goto out; 831 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 832 clcsock_callback(clcsk); 833 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry); 834 835 if (mark.woken) 836 smc_fback_wakeup_waitqueue(smc, mark.key); 837 out: 838 rcu_read_unlock(); 839 } 840 841 static void smc_fback_state_change(struct sock *clcsk) 842 { 843 struct smc_sock *smc; 844 845 read_lock_bh(&clcsk->sk_callback_lock); 846 smc = smc_clcsock_user_data(clcsk); 847 if (smc) 848 smc_fback_forward_wakeup(smc, clcsk, 849 smc->clcsk_state_change); 850 read_unlock_bh(&clcsk->sk_callback_lock); 851 } 852 853 static void smc_fback_data_ready(struct sock *clcsk) 854 { 855 struct smc_sock *smc; 856 857 read_lock_bh(&clcsk->sk_callback_lock); 858 smc = smc_clcsock_user_data(clcsk); 859 if (smc) 860 smc_fback_forward_wakeup(smc, clcsk, 861 smc->clcsk_data_ready); 862 read_unlock_bh(&clcsk->sk_callback_lock); 863 } 864 865 static void smc_fback_write_space(struct sock *clcsk) 866 { 867 struct smc_sock *smc; 868 869 read_lock_bh(&clcsk->sk_callback_lock); 870 smc = smc_clcsock_user_data(clcsk); 871 if (smc) 872 smc_fback_forward_wakeup(smc, clcsk, 873 smc->clcsk_write_space); 874 read_unlock_bh(&clcsk->sk_callback_lock); 875 } 876 877 static void smc_fback_error_report(struct sock *clcsk) 878 { 879 struct smc_sock *smc; 880 881 read_lock_bh(&clcsk->sk_callback_lock); 882 smc = smc_clcsock_user_data(clcsk); 883 if (smc) 884 smc_fback_forward_wakeup(smc, clcsk, 885 smc->clcsk_error_report); 886 read_unlock_bh(&clcsk->sk_callback_lock); 887 } 888 889 static void smc_fback_replace_callbacks(struct smc_sock *smc) 890 { 891 struct sock *clcsk = smc->clcsock->sk; 892 893 write_lock_bh(&clcsk->sk_callback_lock); 894 clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 895 896 smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change, 897 &smc->clcsk_state_change); 898 smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready, 899 &smc->clcsk_data_ready); 900 smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space, 901 &smc->clcsk_write_space); 902 smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report, 903 &smc->clcsk_error_report); 904 905 write_unlock_bh(&clcsk->sk_callback_lock); 906 } 907 908 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code) 909 { 910 int rc = 0; 911 912 mutex_lock(&smc->clcsock_release_lock); 913 if (!smc->clcsock) { 914 rc = -EBADF; 915 goto out; 916 } 917 918 smc->use_fallback = true; 919 smc->fallback_rsn = reason_code; 920 smc_stat_fallback(smc); 921 trace_smc_switch_to_fallback(smc, reason_code); 922 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 923 smc->clcsock->file = smc->sk.sk_socket->file; 924 smc->clcsock->file->private_data = smc->clcsock; 925 smc->clcsock->wq.fasync_list = 926 smc->sk.sk_socket->wq.fasync_list; 927 928 /* There might be some wait entries remaining 929 * in smc sk->sk_wq and they should be woken up 930 * as clcsock's wait queue is woken up. 931 */ 932 smc_fback_replace_callbacks(smc); 933 } 934 out: 935 mutex_unlock(&smc->clcsock_release_lock); 936 return rc; 937 } 938 939 /* fall back during connect */ 940 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 941 { 942 struct net *net = sock_net(&smc->sk); 943 int rc = 0; 944 945 rc = smc_switch_to_fallback(smc, reason_code); 946 if (rc) { /* fallback fails */ 947 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 948 if (smc->sk.sk_state == SMC_INIT) 949 sock_put(&smc->sk); /* passive closing */ 950 return rc; 951 } 952 smc_copy_sock_settings_to_clc(smc); 953 smc->connect_nonblock = 0; 954 if (smc->sk.sk_state == SMC_INIT) 955 smc->sk.sk_state = SMC_ACTIVE; 956 return 0; 957 } 958 959 /* decline and fall back during connect */ 960 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 961 u8 version) 962 { 963 struct net *net = sock_net(&smc->sk); 964 int rc; 965 966 if (reason_code < 0) { /* error, fallback is not possible */ 967 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 968 if (smc->sk.sk_state == SMC_INIT) 969 sock_put(&smc->sk); /* passive closing */ 970 return reason_code; 971 } 972 if (reason_code != SMC_CLC_DECL_PEERDECL) { 973 rc = smc_clc_send_decline(smc, reason_code, version); 974 if (rc < 0) { 975 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 976 if (smc->sk.sk_state == SMC_INIT) 977 sock_put(&smc->sk); /* passive closing */ 978 return rc; 979 } 980 } 981 return smc_connect_fallback(smc, reason_code); 982 } 983 984 static void smc_conn_abort(struct smc_sock *smc, int local_first) 985 { 986 struct smc_connection *conn = &smc->conn; 987 struct smc_link_group *lgr = conn->lgr; 988 bool lgr_valid = false; 989 990 if (smc_conn_lgr_valid(conn)) 991 lgr_valid = true; 992 993 smc_conn_free(conn); 994 if (local_first && lgr_valid) 995 smc_lgr_cleanup_early(lgr); 996 } 997 998 /* check if there is a rdma device available for this connection. */ 999 /* called for connect and listen */ 1000 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 1001 { 1002 /* PNET table look up: search active ib_device and port 1003 * within same PNETID that also contains the ethernet device 1004 * used for the internal TCP socket 1005 */ 1006 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 1007 if (!ini->check_smcrv2 && !ini->ib_dev) 1008 return SMC_CLC_DECL_NOSMCRDEV; 1009 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) 1010 return SMC_CLC_DECL_NOSMCRDEV; 1011 return 0; 1012 } 1013 1014 /* check if there is an ISM device available for this connection. */ 1015 /* called for connect and listen */ 1016 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 1017 { 1018 /* Find ISM device with same PNETID as connecting interface */ 1019 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 1020 if (!ini->ism_dev[0]) 1021 return SMC_CLC_DECL_NOSMCDDEV; 1022 else 1023 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 1024 return 0; 1025 } 1026 1027 /* is chid unique for the ism devices that are already determined? */ 1028 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 1029 int cnt) 1030 { 1031 int i = (!ini->ism_dev[0]) ? 1 : 0; 1032 1033 for (; i < cnt; i++) 1034 if (ini->ism_chid[i] == chid) 1035 return false; 1036 return true; 1037 } 1038 1039 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus 1040 * PNETID matching net_device) 1041 */ 1042 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 1043 struct smc_init_info *ini) 1044 { 1045 int rc = SMC_CLC_DECL_NOSMCDDEV; 1046 struct smcd_dev *smcd; 1047 int i = 1; 1048 u16 chid; 1049 1050 if (smcd_indicated(ini->smc_type_v1)) 1051 rc = 0; /* already initialized for V1 */ 1052 mutex_lock(&smcd_dev_list.mutex); 1053 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1054 if (smcd->going_away || smcd == ini->ism_dev[0]) 1055 continue; 1056 chid = smc_ism_get_chid(smcd); 1057 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 1058 continue; 1059 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 1060 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 1061 ini->ism_dev[i] = smcd; 1062 ini->ism_chid[i] = chid; 1063 ini->is_smcd = true; 1064 rc = 0; 1065 i++; 1066 if (i > SMC_MAX_ISM_DEVS) 1067 break; 1068 } 1069 } 1070 mutex_unlock(&smcd_dev_list.mutex); 1071 ini->ism_offered_cnt = i - 1; 1072 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 1073 ini->smcd_version = 0; 1074 1075 return rc; 1076 } 1077 1078 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 1079 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 1080 struct smc_init_info *ini) 1081 { 1082 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 1083 return SMC_CLC_DECL_ISMVLANERR; 1084 return 0; 1085 } 1086 1087 static int smc_find_proposal_devices(struct smc_sock *smc, 1088 struct smc_init_info *ini) 1089 { 1090 int rc = 0; 1091 1092 /* check if there is an ism device available */ 1093 if (!(ini->smcd_version & SMC_V1) || 1094 smc_find_ism_device(smc, ini) || 1095 smc_connect_ism_vlan_setup(smc, ini)) 1096 ini->smcd_version &= ~SMC_V1; 1097 /* else ISM V1 is supported for this connection */ 1098 1099 /* check if there is an rdma device available */ 1100 if (!(ini->smcr_version & SMC_V1) || 1101 smc_find_rdma_device(smc, ini)) 1102 ini->smcr_version &= ~SMC_V1; 1103 /* else RDMA is supported for this connection */ 1104 1105 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 1106 ini->smcr_version & SMC_V1); 1107 1108 /* check if there is an ism v2 device available */ 1109 if (!(ini->smcd_version & SMC_V2) || 1110 !smc_ism_is_v2_capable() || 1111 smc_find_ism_v2_device_clnt(smc, ini)) 1112 ini->smcd_version &= ~SMC_V2; 1113 1114 /* check if there is an rdma v2 device available */ 1115 ini->check_smcrv2 = true; 1116 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 1117 if (!(ini->smcr_version & SMC_V2) || 1118 smc->clcsock->sk->sk_family != AF_INET || 1119 !smc_clc_ueid_count() || 1120 smc_find_rdma_device(smc, ini)) 1121 ini->smcr_version &= ~SMC_V2; 1122 ini->check_smcrv2 = false; 1123 1124 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 1125 ini->smcr_version & SMC_V2); 1126 1127 /* if neither ISM nor RDMA are supported, fallback */ 1128 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 1129 rc = SMC_CLC_DECL_NOSMCDEV; 1130 1131 return rc; 1132 } 1133 1134 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 1135 * used, the VLAN ID will be registered again during the connection setup. 1136 */ 1137 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 1138 struct smc_init_info *ini) 1139 { 1140 if (!smcd_indicated(ini->smc_type_v1)) 1141 return 0; 1142 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 1143 return SMC_CLC_DECL_CNFERR; 1144 return 0; 1145 } 1146 1147 #define SMC_CLC_MAX_ACCEPT_LEN \ 1148 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \ 1149 sizeof(struct smc_clc_first_contact_ext_v2x) + \ 1150 sizeof(struct smc_clc_msg_trail)) 1151 1152 /* CLC handshake during connect */ 1153 static int smc_connect_clc(struct smc_sock *smc, 1154 struct smc_clc_msg_accept_confirm_v2 *aclc2, 1155 struct smc_init_info *ini) 1156 { 1157 int rc = 0; 1158 1159 /* do inband token exchange */ 1160 rc = smc_clc_send_proposal(smc, ini); 1161 if (rc) 1162 return rc; 1163 /* receive SMC Accept CLC message */ 1164 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, 1165 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 1166 } 1167 1168 void smc_fill_gid_list(struct smc_link_group *lgr, 1169 struct smc_gidlist *gidlist, 1170 struct smc_ib_device *known_dev, u8 *known_gid) 1171 { 1172 struct smc_init_info *alt_ini = NULL; 1173 1174 memset(gidlist, 0, sizeof(*gidlist)); 1175 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 1176 1177 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 1178 if (!alt_ini) 1179 goto out; 1180 1181 alt_ini->vlan_id = lgr->vlan_id; 1182 alt_ini->check_smcrv2 = true; 1183 alt_ini->smcrv2.saddr = lgr->saddr; 1184 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 1185 1186 if (!alt_ini->smcrv2.ib_dev_v2) 1187 goto out; 1188 1189 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 1190 SMC_GID_SIZE); 1191 1192 out: 1193 kfree(alt_ini); 1194 } 1195 1196 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 1197 struct smc_clc_msg_accept_confirm *aclc, 1198 struct smc_init_info *ini) 1199 { 1200 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1201 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1202 struct smc_clc_first_contact_ext *fce = 1203 smc_get_clc_first_contact_ext(clc_v2, false); 1204 int rc; 1205 1206 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 1207 return 0; 1208 1209 if (fce->v2_direct) { 1210 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 1211 ini->smcrv2.uses_gateway = false; 1212 } else { 1213 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr, 1214 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 1215 ini->smcrv2.nexthop_mac, 1216 &ini->smcrv2.uses_gateway)) 1217 return SMC_CLC_DECL_NOROUTE; 1218 if (!ini->smcrv2.uses_gateway) { 1219 /* mismatch: peer claims indirect, but its direct */ 1220 return SMC_CLC_DECL_NOINDIRECT; 1221 } 1222 } 1223 1224 ini->release_nr = fce->release; 1225 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1226 if (rc) 1227 return rc; 1228 1229 return 0; 1230 } 1231 1232 /* setup for RDMA connection of client */ 1233 static int smc_connect_rdma(struct smc_sock *smc, 1234 struct smc_clc_msg_accept_confirm *aclc, 1235 struct smc_init_info *ini) 1236 { 1237 int i, reason_code = 0; 1238 struct smc_link *link; 1239 u8 *eid = NULL; 1240 1241 ini->is_smcd = false; 1242 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 1243 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1244 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 1245 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 1246 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 1247 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1248 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1249 1250 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 1251 if (reason_code) 1252 return reason_code; 1253 1254 mutex_lock(&smc_client_lgr_pending); 1255 reason_code = smc_conn_create(smc, ini); 1256 if (reason_code) { 1257 mutex_unlock(&smc_client_lgr_pending); 1258 return reason_code; 1259 } 1260 1261 smc_conn_save_peer_info(smc, aclc); 1262 1263 if (ini->first_contact_local) { 1264 link = smc->conn.lnk; 1265 } else { 1266 /* set link that was assigned by server */ 1267 link = NULL; 1268 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1269 struct smc_link *l = &smc->conn.lgr->lnk[i]; 1270 1271 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 1272 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 1273 SMC_GID_SIZE) && 1274 (aclc->hdr.version > SMC_V1 || 1275 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 1276 sizeof(l->peer_mac)))) { 1277 link = l; 1278 break; 1279 } 1280 } 1281 if (!link) { 1282 reason_code = SMC_CLC_DECL_NOSRVLINK; 1283 goto connect_abort; 1284 } 1285 smc_switch_link_and_count(&smc->conn, link); 1286 } 1287 1288 /* create send buffer and rmb */ 1289 if (smc_buf_create(smc, false)) { 1290 reason_code = SMC_CLC_DECL_MEM; 1291 goto connect_abort; 1292 } 1293 1294 if (ini->first_contact_local) 1295 smc_link_save_peer_info(link, aclc, ini); 1296 1297 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 1298 reason_code = SMC_CLC_DECL_ERR_RTOK; 1299 goto connect_abort; 1300 } 1301 1302 smc_close_init(smc); 1303 smc_rx_init(smc); 1304 1305 if (ini->first_contact_local) { 1306 if (smc_ib_ready_link(link)) { 1307 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1308 goto connect_abort; 1309 } 1310 } else { 1311 /* reg sendbufs if they were vzalloced */ 1312 if (smc->conn.sndbuf_desc->is_vm) { 1313 if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) { 1314 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1315 goto connect_abort; 1316 } 1317 } 1318 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 1319 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1320 goto connect_abort; 1321 } 1322 } 1323 1324 if (aclc->hdr.version > SMC_V1) { 1325 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1326 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1327 1328 eid = clc_v2->r1.eid; 1329 if (ini->first_contact_local) 1330 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 1331 link->smcibdev, link->gid); 1332 } 1333 1334 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 1335 aclc->hdr.version, eid, ini); 1336 if (reason_code) 1337 goto connect_abort; 1338 1339 smc_tx_init(smc); 1340 1341 if (ini->first_contact_local) { 1342 /* QP confirmation over RoCE fabric */ 1343 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1344 reason_code = smcr_clnt_conf_first_link(smc); 1345 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1346 if (reason_code) 1347 goto connect_abort; 1348 } 1349 mutex_unlock(&smc_client_lgr_pending); 1350 1351 smc_copy_sock_settings_to_clc(smc); 1352 smc->connect_nonblock = 0; 1353 if (smc->sk.sk_state == SMC_INIT) 1354 smc->sk.sk_state = SMC_ACTIVE; 1355 1356 return 0; 1357 connect_abort: 1358 smc_conn_abort(smc, ini->first_contact_local); 1359 mutex_unlock(&smc_client_lgr_pending); 1360 smc->connect_nonblock = 0; 1361 1362 return reason_code; 1363 } 1364 1365 /* The server has chosen one of the proposed ISM devices for the communication. 1366 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1367 */ 1368 static int 1369 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 1370 struct smc_init_info *ini) 1371 { 1372 int i; 1373 1374 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1375 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1376 ini->ism_selected = i; 1377 return 0; 1378 } 1379 } 1380 1381 return -EPROTO; 1382 } 1383 1384 /* setup for ISM connection of client */ 1385 static int smc_connect_ism(struct smc_sock *smc, 1386 struct smc_clc_msg_accept_confirm *aclc, 1387 struct smc_init_info *ini) 1388 { 1389 u8 *eid = NULL; 1390 int rc = 0; 1391 1392 ini->is_smcd = true; 1393 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1394 1395 if (aclc->hdr.version == SMC_V2) { 1396 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 1397 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1398 1399 if (ini->first_contact_peer) { 1400 struct smc_clc_first_contact_ext *fce = 1401 smc_get_clc_first_contact_ext(aclc_v2, true); 1402 1403 ini->release_nr = fce->release; 1404 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1405 if (rc) 1406 return rc; 1407 } 1408 1409 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 1410 if (rc) 1411 return rc; 1412 } 1413 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 1414 1415 /* there is only one lgr role for SMC-D; use server lock */ 1416 mutex_lock(&smc_server_lgr_pending); 1417 rc = smc_conn_create(smc, ini); 1418 if (rc) { 1419 mutex_unlock(&smc_server_lgr_pending); 1420 return rc; 1421 } 1422 1423 /* Create send and receive buffers */ 1424 rc = smc_buf_create(smc, true); 1425 if (rc) { 1426 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1427 goto connect_abort; 1428 } 1429 1430 smc_conn_save_peer_info(smc, aclc); 1431 smc_close_init(smc); 1432 smc_rx_init(smc); 1433 smc_tx_init(smc); 1434 1435 if (aclc->hdr.version > SMC_V1) { 1436 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1437 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1438 1439 eid = clc_v2->d1.eid; 1440 } 1441 1442 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1443 aclc->hdr.version, eid, ini); 1444 if (rc) 1445 goto connect_abort; 1446 mutex_unlock(&smc_server_lgr_pending); 1447 1448 smc_copy_sock_settings_to_clc(smc); 1449 smc->connect_nonblock = 0; 1450 if (smc->sk.sk_state == SMC_INIT) 1451 smc->sk.sk_state = SMC_ACTIVE; 1452 1453 return 0; 1454 connect_abort: 1455 smc_conn_abort(smc, ini->first_contact_local); 1456 mutex_unlock(&smc_server_lgr_pending); 1457 smc->connect_nonblock = 0; 1458 1459 return rc; 1460 } 1461 1462 /* check if received accept type and version matches a proposed one */ 1463 static int smc_connect_check_aclc(struct smc_init_info *ini, 1464 struct smc_clc_msg_accept_confirm *aclc) 1465 { 1466 if (aclc->hdr.typev1 != SMC_TYPE_R && 1467 aclc->hdr.typev1 != SMC_TYPE_D) 1468 return SMC_CLC_DECL_MODEUNSUPP; 1469 1470 if (aclc->hdr.version >= SMC_V2) { 1471 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1472 !smcr_indicated(ini->smc_type_v2)) || 1473 (aclc->hdr.typev1 == SMC_TYPE_D && 1474 !smcd_indicated(ini->smc_type_v2))) 1475 return SMC_CLC_DECL_MODEUNSUPP; 1476 } else { 1477 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1478 !smcr_indicated(ini->smc_type_v1)) || 1479 (aclc->hdr.typev1 == SMC_TYPE_D && 1480 !smcd_indicated(ini->smc_type_v1))) 1481 return SMC_CLC_DECL_MODEUNSUPP; 1482 } 1483 1484 return 0; 1485 } 1486 1487 /* perform steps before actually connecting */ 1488 static int __smc_connect(struct smc_sock *smc) 1489 { 1490 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1491 struct smc_clc_msg_accept_confirm_v2 *aclc2; 1492 struct smc_clc_msg_accept_confirm *aclc; 1493 struct smc_init_info *ini = NULL; 1494 u8 *buf = NULL; 1495 int rc = 0; 1496 1497 if (smc->use_fallback) 1498 return smc_connect_fallback(smc, smc->fallback_rsn); 1499 1500 /* if peer has not signalled SMC-capability, fall back */ 1501 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1502 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1503 1504 /* IPSec connections opt out of SMC optimizations */ 1505 if (using_ipsec(smc)) 1506 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1507 version); 1508 1509 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1510 if (!ini) 1511 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1512 version); 1513 1514 ini->smcd_version = SMC_V1 | SMC_V2; 1515 ini->smcr_version = SMC_V1 | SMC_V2; 1516 ini->smc_type_v1 = SMC_TYPE_B; 1517 ini->smc_type_v2 = SMC_TYPE_B; 1518 1519 /* get vlan id from IP device */ 1520 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1521 ini->smcd_version &= ~SMC_V1; 1522 ini->smcr_version = 0; 1523 ini->smc_type_v1 = SMC_TYPE_N; 1524 if (!ini->smcd_version) { 1525 rc = SMC_CLC_DECL_GETVLANERR; 1526 goto fallback; 1527 } 1528 } 1529 1530 rc = smc_find_proposal_devices(smc, ini); 1531 if (rc) 1532 goto fallback; 1533 1534 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1535 if (!buf) { 1536 rc = SMC_CLC_DECL_MEM; 1537 goto fallback; 1538 } 1539 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1540 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1541 1542 /* perform CLC handshake */ 1543 rc = smc_connect_clc(smc, aclc2, ini); 1544 if (rc) { 1545 /* -EAGAIN on timeout, see tcp_recvmsg() */ 1546 if (rc == -EAGAIN) { 1547 rc = -ETIMEDOUT; 1548 smc->sk.sk_err = ETIMEDOUT; 1549 } 1550 goto vlan_cleanup; 1551 } 1552 1553 /* check if smc modes and versions of CLC proposal and accept match */ 1554 rc = smc_connect_check_aclc(ini, aclc); 1555 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1556 if (rc) 1557 goto vlan_cleanup; 1558 1559 /* depending on previous steps, connect using rdma or ism */ 1560 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1561 ini->smcr_version = version; 1562 rc = smc_connect_rdma(smc, aclc, ini); 1563 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1564 ini->smcd_version = version; 1565 rc = smc_connect_ism(smc, aclc, ini); 1566 } 1567 if (rc) 1568 goto vlan_cleanup; 1569 1570 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1571 smc_connect_ism_vlan_cleanup(smc, ini); 1572 kfree(buf); 1573 kfree(ini); 1574 return 0; 1575 1576 vlan_cleanup: 1577 smc_connect_ism_vlan_cleanup(smc, ini); 1578 kfree(buf); 1579 fallback: 1580 kfree(ini); 1581 return smc_connect_decline_fallback(smc, rc, version); 1582 } 1583 1584 static void smc_connect_work(struct work_struct *work) 1585 { 1586 struct smc_sock *smc = container_of(work, struct smc_sock, 1587 connect_work); 1588 long timeo = smc->sk.sk_sndtimeo; 1589 int rc = 0; 1590 1591 if (!timeo) 1592 timeo = MAX_SCHEDULE_TIMEOUT; 1593 lock_sock(smc->clcsock->sk); 1594 if (smc->clcsock->sk->sk_err) { 1595 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1596 } else if ((1 << smc->clcsock->sk->sk_state) & 1597 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1598 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1599 if ((rc == -EPIPE) && 1600 ((1 << smc->clcsock->sk->sk_state) & 1601 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1602 rc = 0; 1603 } 1604 release_sock(smc->clcsock->sk); 1605 lock_sock(&smc->sk); 1606 if (rc != 0 || smc->sk.sk_err) { 1607 smc->sk.sk_state = SMC_CLOSED; 1608 if (rc == -EPIPE || rc == -EAGAIN) 1609 smc->sk.sk_err = EPIPE; 1610 else if (rc == -ECONNREFUSED) 1611 smc->sk.sk_err = ECONNREFUSED; 1612 else if (signal_pending(current)) 1613 smc->sk.sk_err = -sock_intr_errno(timeo); 1614 sock_put(&smc->sk); /* passive closing */ 1615 goto out; 1616 } 1617 1618 rc = __smc_connect(smc); 1619 if (rc < 0) 1620 smc->sk.sk_err = -rc; 1621 1622 out: 1623 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1624 if (smc->sk.sk_err) { 1625 smc->sk.sk_state_change(&smc->sk); 1626 } else { /* allow polling before and after fallback decision */ 1627 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1628 smc->sk.sk_write_space(&smc->sk); 1629 } 1630 } 1631 release_sock(&smc->sk); 1632 } 1633 1634 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1635 int alen, int flags) 1636 { 1637 struct sock *sk = sock->sk; 1638 struct smc_sock *smc; 1639 int rc = -EINVAL; 1640 1641 smc = smc_sk(sk); 1642 1643 /* separate smc parameter checking to be safe */ 1644 if (alen < sizeof(addr->sa_family)) 1645 goto out_err; 1646 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1647 goto out_err; 1648 1649 lock_sock(sk); 1650 switch (sock->state) { 1651 default: 1652 rc = -EINVAL; 1653 goto out; 1654 case SS_CONNECTED: 1655 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL; 1656 goto out; 1657 case SS_CONNECTING: 1658 if (sk->sk_state == SMC_ACTIVE) 1659 goto connected; 1660 break; 1661 case SS_UNCONNECTED: 1662 sock->state = SS_CONNECTING; 1663 break; 1664 } 1665 1666 switch (sk->sk_state) { 1667 default: 1668 goto out; 1669 case SMC_CLOSED: 1670 rc = sock_error(sk) ? : -ECONNABORTED; 1671 sock->state = SS_UNCONNECTED; 1672 goto out; 1673 case SMC_ACTIVE: 1674 rc = -EISCONN; 1675 goto out; 1676 case SMC_INIT: 1677 break; 1678 } 1679 1680 smc_copy_sock_settings_to_clc(smc); 1681 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1682 if (smc->connect_nonblock) { 1683 rc = -EALREADY; 1684 goto out; 1685 } 1686 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1687 if (rc && rc != -EINPROGRESS) 1688 goto out; 1689 1690 if (smc->use_fallback) { 1691 sock->state = rc ? SS_CONNECTING : SS_CONNECTED; 1692 goto out; 1693 } 1694 sock_hold(&smc->sk); /* sock put in passive closing */ 1695 if (flags & O_NONBLOCK) { 1696 if (queue_work(smc_hs_wq, &smc->connect_work)) 1697 smc->connect_nonblock = 1; 1698 rc = -EINPROGRESS; 1699 goto out; 1700 } else { 1701 rc = __smc_connect(smc); 1702 if (rc < 0) 1703 goto out; 1704 } 1705 1706 connected: 1707 rc = 0; 1708 sock->state = SS_CONNECTED; 1709 out: 1710 release_sock(sk); 1711 out_err: 1712 return rc; 1713 } 1714 1715 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1716 { 1717 struct socket *new_clcsock = NULL; 1718 struct sock *lsk = &lsmc->sk; 1719 struct sock *new_sk; 1720 int rc = -EINVAL; 1721 1722 release_sock(lsk); 1723 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1724 if (!new_sk) { 1725 rc = -ENOMEM; 1726 lsk->sk_err = ENOMEM; 1727 *new_smc = NULL; 1728 lock_sock(lsk); 1729 goto out; 1730 } 1731 *new_smc = smc_sk(new_sk); 1732 1733 mutex_lock(&lsmc->clcsock_release_lock); 1734 if (lsmc->clcsock) 1735 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1736 mutex_unlock(&lsmc->clcsock_release_lock); 1737 lock_sock(lsk); 1738 if (rc < 0 && rc != -EAGAIN) 1739 lsk->sk_err = -rc; 1740 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1741 new_sk->sk_prot->unhash(new_sk); 1742 if (new_clcsock) 1743 sock_release(new_clcsock); 1744 new_sk->sk_state = SMC_CLOSED; 1745 sock_set_flag(new_sk, SOCK_DEAD); 1746 sock_put(new_sk); /* final */ 1747 *new_smc = NULL; 1748 goto out; 1749 } 1750 1751 /* new clcsock has inherited the smc listen-specific sk_data_ready 1752 * function; switch it back to the original sk_data_ready function 1753 */ 1754 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1755 1756 /* if new clcsock has also inherited the fallback-specific callback 1757 * functions, switch them back to the original ones. 1758 */ 1759 if (lsmc->use_fallback) { 1760 if (lsmc->clcsk_state_change) 1761 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change; 1762 if (lsmc->clcsk_write_space) 1763 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space; 1764 if (lsmc->clcsk_error_report) 1765 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report; 1766 } 1767 1768 (*new_smc)->clcsock = new_clcsock; 1769 out: 1770 return rc; 1771 } 1772 1773 /* add a just created sock to the accept queue of the listen sock as 1774 * candidate for a following socket accept call from user space 1775 */ 1776 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1777 { 1778 struct smc_sock *par = smc_sk(parent); 1779 1780 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1781 spin_lock(&par->accept_q_lock); 1782 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1783 spin_unlock(&par->accept_q_lock); 1784 sk_acceptq_added(parent); 1785 } 1786 1787 /* remove a socket from the accept queue of its parental listening socket */ 1788 static void smc_accept_unlink(struct sock *sk) 1789 { 1790 struct smc_sock *par = smc_sk(sk)->listen_smc; 1791 1792 spin_lock(&par->accept_q_lock); 1793 list_del_init(&smc_sk(sk)->accept_q); 1794 spin_unlock(&par->accept_q_lock); 1795 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1796 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1797 } 1798 1799 /* remove a sock from the accept queue to bind it to a new socket created 1800 * for a socket accept call from user space 1801 */ 1802 struct sock *smc_accept_dequeue(struct sock *parent, 1803 struct socket *new_sock) 1804 { 1805 struct smc_sock *isk, *n; 1806 struct sock *new_sk; 1807 1808 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1809 new_sk = (struct sock *)isk; 1810 1811 smc_accept_unlink(new_sk); 1812 if (new_sk->sk_state == SMC_CLOSED) { 1813 new_sk->sk_prot->unhash(new_sk); 1814 if (isk->clcsock) { 1815 sock_release(isk->clcsock); 1816 isk->clcsock = NULL; 1817 } 1818 sock_put(new_sk); /* final */ 1819 continue; 1820 } 1821 if (new_sock) { 1822 sock_graft(new_sk, new_sock); 1823 new_sock->state = SS_CONNECTED; 1824 if (isk->use_fallback) { 1825 smc_sk(new_sk)->clcsock->file = new_sock->file; 1826 isk->clcsock->file->private_data = isk->clcsock; 1827 } 1828 } 1829 return new_sk; 1830 } 1831 return NULL; 1832 } 1833 1834 /* clean up for a created but never accepted sock */ 1835 void smc_close_non_accepted(struct sock *sk) 1836 { 1837 struct smc_sock *smc = smc_sk(sk); 1838 1839 sock_hold(sk); /* sock_put below */ 1840 lock_sock(sk); 1841 if (!sk->sk_lingertime) 1842 /* wait for peer closing */ 1843 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT); 1844 __smc_release(smc); 1845 release_sock(sk); 1846 sock_put(sk); /* sock_hold above */ 1847 sock_put(sk); /* final sock_put */ 1848 } 1849 1850 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1851 { 1852 struct smc_link *link = smc->conn.lnk; 1853 struct smc_llc_qentry *qentry; 1854 int rc; 1855 1856 /* reg the sndbuf if it was vzalloced*/ 1857 if (smc->conn.sndbuf_desc->is_vm) { 1858 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) 1859 return SMC_CLC_DECL_ERR_REGBUF; 1860 } 1861 1862 /* reg the rmb */ 1863 if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) 1864 return SMC_CLC_DECL_ERR_REGBUF; 1865 1866 /* send CONFIRM LINK request to client over the RoCE fabric */ 1867 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1868 if (rc < 0) 1869 return SMC_CLC_DECL_TIMEOUT_CL; 1870 1871 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1872 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1873 SMC_LLC_CONFIRM_LINK); 1874 if (!qentry) { 1875 struct smc_clc_msg_decline dclc; 1876 1877 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1878 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1879 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1880 } 1881 smc_llc_save_peer_uid(qentry); 1882 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1883 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1884 if (rc) 1885 return SMC_CLC_DECL_RMBE_EC; 1886 1887 /* confirm_rkey is implicit on 1st contact */ 1888 smc->conn.rmb_desc->is_conf_rkey = true; 1889 1890 smc_llc_link_active(link); 1891 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1892 1893 if (link->lgr->max_links > 1) { 1894 down_write(&link->lgr->llc_conf_mutex); 1895 /* initial contact - try to establish second link */ 1896 smc_llc_srv_add_link(link, NULL); 1897 up_write(&link->lgr->llc_conf_mutex); 1898 } 1899 return 0; 1900 } 1901 1902 /* listen worker: finish */ 1903 static void smc_listen_out(struct smc_sock *new_smc) 1904 { 1905 struct smc_sock *lsmc = new_smc->listen_smc; 1906 struct sock *newsmcsk = &new_smc->sk; 1907 1908 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 1909 atomic_dec(&lsmc->queued_smc_hs); 1910 1911 if (lsmc->sk.sk_state == SMC_LISTEN) { 1912 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1913 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1914 release_sock(&lsmc->sk); 1915 } else { /* no longer listening */ 1916 smc_close_non_accepted(newsmcsk); 1917 } 1918 1919 /* Wake up accept */ 1920 lsmc->sk.sk_data_ready(&lsmc->sk); 1921 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1922 } 1923 1924 /* listen worker: finish in state connected */ 1925 static void smc_listen_out_connected(struct smc_sock *new_smc) 1926 { 1927 struct sock *newsmcsk = &new_smc->sk; 1928 1929 if (newsmcsk->sk_state == SMC_INIT) 1930 newsmcsk->sk_state = SMC_ACTIVE; 1931 1932 smc_listen_out(new_smc); 1933 } 1934 1935 /* listen worker: finish in error state */ 1936 static void smc_listen_out_err(struct smc_sock *new_smc) 1937 { 1938 struct sock *newsmcsk = &new_smc->sk; 1939 struct net *net = sock_net(newsmcsk); 1940 1941 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1942 if (newsmcsk->sk_state == SMC_INIT) 1943 sock_put(&new_smc->sk); /* passive closing */ 1944 newsmcsk->sk_state = SMC_CLOSED; 1945 1946 smc_listen_out(new_smc); 1947 } 1948 1949 /* listen worker: decline and fall back if possible */ 1950 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1951 int local_first, u8 version) 1952 { 1953 /* RDMA setup failed, switch back to TCP */ 1954 smc_conn_abort(new_smc, local_first); 1955 if (reason_code < 0 || 1956 smc_switch_to_fallback(new_smc, reason_code)) { 1957 /* error, no fallback possible */ 1958 smc_listen_out_err(new_smc); 1959 return; 1960 } 1961 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1962 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1963 smc_listen_out_err(new_smc); 1964 return; 1965 } 1966 } 1967 smc_listen_out_connected(new_smc); 1968 } 1969 1970 /* listen worker: version checking */ 1971 static int smc_listen_v2_check(struct smc_sock *new_smc, 1972 struct smc_clc_msg_proposal *pclc, 1973 struct smc_init_info *ini) 1974 { 1975 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1976 struct smc_clc_v2_extension *pclc_v2_ext; 1977 int rc = SMC_CLC_DECL_PEERNOSMC; 1978 1979 ini->smc_type_v1 = pclc->hdr.typev1; 1980 ini->smc_type_v2 = pclc->hdr.typev2; 1981 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1982 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1983 if (pclc->hdr.version > SMC_V1) { 1984 if (smcd_indicated(ini->smc_type_v2)) 1985 ini->smcd_version |= SMC_V2; 1986 if (smcr_indicated(ini->smc_type_v2)) 1987 ini->smcr_version |= SMC_V2; 1988 } 1989 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 1990 rc = SMC_CLC_DECL_PEERNOSMC; 1991 goto out; 1992 } 1993 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1994 if (!pclc_v2_ext) { 1995 ini->smcd_version &= ~SMC_V2; 1996 ini->smcr_version &= ~SMC_V2; 1997 rc = SMC_CLC_DECL_NOV2EXT; 1998 goto out; 1999 } 2000 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 2001 if (ini->smcd_version & SMC_V2) { 2002 if (!smc_ism_is_v2_capable()) { 2003 ini->smcd_version &= ~SMC_V2; 2004 rc = SMC_CLC_DECL_NOISM2SUPP; 2005 } else if (!pclc_smcd_v2_ext) { 2006 ini->smcd_version &= ~SMC_V2; 2007 rc = SMC_CLC_DECL_NOV2DEXT; 2008 } else if (!pclc_v2_ext->hdr.eid_cnt && 2009 !pclc_v2_ext->hdr.flag.seid) { 2010 ini->smcd_version &= ~SMC_V2; 2011 rc = SMC_CLC_DECL_NOUEID; 2012 } 2013 } 2014 if (ini->smcr_version & SMC_V2) { 2015 if (!pclc_v2_ext->hdr.eid_cnt) { 2016 ini->smcr_version &= ~SMC_V2; 2017 rc = SMC_CLC_DECL_NOUEID; 2018 } 2019 } 2020 2021 ini->release_nr = pclc_v2_ext->hdr.flag.release; 2022 if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE) 2023 ini->release_nr = SMC_RELEASE; 2024 2025 out: 2026 if (!ini->smcd_version && !ini->smcr_version) 2027 return rc; 2028 2029 return 0; 2030 } 2031 2032 /* listen worker: check prefixes */ 2033 static int smc_listen_prfx_check(struct smc_sock *new_smc, 2034 struct smc_clc_msg_proposal *pclc) 2035 { 2036 struct smc_clc_msg_proposal_prefix *pclc_prfx; 2037 struct socket *newclcsock = new_smc->clcsock; 2038 2039 if (pclc->hdr.typev1 == SMC_TYPE_N) 2040 return 0; 2041 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 2042 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 2043 return SMC_CLC_DECL_DIFFPREFIX; 2044 2045 return 0; 2046 } 2047 2048 /* listen worker: initialize connection and buffers */ 2049 static int smc_listen_rdma_init(struct smc_sock *new_smc, 2050 struct smc_init_info *ini) 2051 { 2052 int rc; 2053 2054 /* allocate connection / link group */ 2055 rc = smc_conn_create(new_smc, ini); 2056 if (rc) 2057 return rc; 2058 2059 /* create send buffer and rmb */ 2060 if (smc_buf_create(new_smc, false)) { 2061 smc_conn_abort(new_smc, ini->first_contact_local); 2062 return SMC_CLC_DECL_MEM; 2063 } 2064 2065 return 0; 2066 } 2067 2068 /* listen worker: initialize connection and buffers for SMC-D */ 2069 static int smc_listen_ism_init(struct smc_sock *new_smc, 2070 struct smc_init_info *ini) 2071 { 2072 int rc; 2073 2074 rc = smc_conn_create(new_smc, ini); 2075 if (rc) 2076 return rc; 2077 2078 /* Create send and receive buffers */ 2079 rc = smc_buf_create(new_smc, true); 2080 if (rc) { 2081 smc_conn_abort(new_smc, ini->first_contact_local); 2082 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 2083 SMC_CLC_DECL_MEM; 2084 } 2085 2086 return 0; 2087 } 2088 2089 static bool smc_is_already_selected(struct smcd_dev *smcd, 2090 struct smc_init_info *ini, 2091 int matches) 2092 { 2093 int i; 2094 2095 for (i = 0; i < matches; i++) 2096 if (smcd == ini->ism_dev[i]) 2097 return true; 2098 2099 return false; 2100 } 2101 2102 /* check for ISM devices matching proposed ISM devices */ 2103 static void smc_check_ism_v2_match(struct smc_init_info *ini, 2104 u16 proposed_chid, u64 proposed_gid, 2105 unsigned int *matches) 2106 { 2107 struct smcd_dev *smcd; 2108 2109 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2110 if (smcd->going_away) 2111 continue; 2112 if (smc_is_already_selected(smcd, ini, *matches)) 2113 continue; 2114 if (smc_ism_get_chid(smcd) == proposed_chid && 2115 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 2116 ini->ism_peer_gid[*matches] = proposed_gid; 2117 ini->ism_dev[*matches] = smcd; 2118 (*matches)++; 2119 break; 2120 } 2121 } 2122 } 2123 2124 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 2125 { 2126 if (!ini->rc) 2127 ini->rc = rc; 2128 } 2129 2130 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 2131 struct smc_clc_msg_proposal *pclc, 2132 struct smc_init_info *ini) 2133 { 2134 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 2135 struct smc_clc_v2_extension *smc_v2_ext; 2136 struct smc_clc_msg_smcd *pclc_smcd; 2137 unsigned int matches = 0; 2138 u8 smcd_version; 2139 u8 *eid = NULL; 2140 int i, rc; 2141 2142 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 2143 goto not_found; 2144 2145 pclc_smcd = smc_get_clc_msg_smcd(pclc); 2146 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2147 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 2148 2149 mutex_lock(&smcd_dev_list.mutex); 2150 if (pclc_smcd->ism.chid) 2151 /* check for ISM device matching proposed native ISM device */ 2152 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 2153 ntohll(pclc_smcd->ism.gid), &matches); 2154 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 2155 /* check for ISM devices matching proposed non-native ISM 2156 * devices 2157 */ 2158 smc_check_ism_v2_match(ini, 2159 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 2160 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 2161 &matches); 2162 } 2163 mutex_unlock(&smcd_dev_list.mutex); 2164 2165 if (!ini->ism_dev[0]) { 2166 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 2167 goto not_found; 2168 } 2169 2170 smc_ism_get_system_eid(&eid); 2171 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 2172 smcd_v2_ext->system_eid, eid)) 2173 goto not_found; 2174 2175 /* separate - outside the smcd_dev_list.lock */ 2176 smcd_version = ini->smcd_version; 2177 for (i = 0; i < matches; i++) { 2178 ini->smcd_version = SMC_V2; 2179 ini->is_smcd = true; 2180 ini->ism_selected = i; 2181 rc = smc_listen_ism_init(new_smc, ini); 2182 if (rc) { 2183 smc_find_ism_store_rc(rc, ini); 2184 /* try next active ISM device */ 2185 continue; 2186 } 2187 return; /* matching and usable V2 ISM device found */ 2188 } 2189 /* no V2 ISM device could be initialized */ 2190 ini->smcd_version = smcd_version; /* restore original value */ 2191 ini->negotiated_eid[0] = 0; 2192 2193 not_found: 2194 ini->smcd_version &= ~SMC_V2; 2195 ini->ism_dev[0] = NULL; 2196 ini->is_smcd = false; 2197 } 2198 2199 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 2200 struct smc_clc_msg_proposal *pclc, 2201 struct smc_init_info *ini) 2202 { 2203 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 2204 int rc = 0; 2205 2206 /* check if ISM V1 is available */ 2207 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 2208 goto not_found; 2209 ini->is_smcd = true; /* prepare ISM check */ 2210 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 2211 rc = smc_find_ism_device(new_smc, ini); 2212 if (rc) 2213 goto not_found; 2214 ini->ism_selected = 0; 2215 rc = smc_listen_ism_init(new_smc, ini); 2216 if (!rc) 2217 return; /* V1 ISM device found */ 2218 2219 not_found: 2220 smc_find_ism_store_rc(rc, ini); 2221 ini->smcd_version &= ~SMC_V1; 2222 ini->ism_dev[0] = NULL; 2223 ini->is_smcd = false; 2224 } 2225 2226 /* listen worker: register buffers */ 2227 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 2228 { 2229 struct smc_connection *conn = &new_smc->conn; 2230 2231 if (!local_first) { 2232 /* reg sendbufs if they were vzalloced */ 2233 if (conn->sndbuf_desc->is_vm) { 2234 if (smcr_lgr_reg_sndbufs(conn->lnk, 2235 conn->sndbuf_desc)) 2236 return SMC_CLC_DECL_ERR_REGBUF; 2237 } 2238 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 2239 return SMC_CLC_DECL_ERR_REGBUF; 2240 } 2241 2242 return 0; 2243 } 2244 2245 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 2246 struct smc_clc_msg_proposal *pclc, 2247 struct smc_init_info *ini) 2248 { 2249 struct smc_clc_v2_extension *smc_v2_ext; 2250 u8 smcr_version; 2251 int rc; 2252 2253 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 2254 goto not_found; 2255 2256 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2257 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 2258 goto not_found; 2259 2260 /* prepare RDMA check */ 2261 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2262 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 2263 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2264 ini->check_smcrv2 = true; 2265 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 2266 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 2267 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 2268 rc = smc_find_rdma_device(new_smc, ini); 2269 if (rc) { 2270 smc_find_ism_store_rc(rc, ini); 2271 goto not_found; 2272 } 2273 if (!ini->smcrv2.uses_gateway) 2274 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 2275 2276 smcr_version = ini->smcr_version; 2277 ini->smcr_version = SMC_V2; 2278 rc = smc_listen_rdma_init(new_smc, ini); 2279 if (!rc) { 2280 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2281 if (rc) 2282 smc_conn_abort(new_smc, ini->first_contact_local); 2283 } 2284 if (!rc) 2285 return; 2286 ini->smcr_version = smcr_version; 2287 smc_find_ism_store_rc(rc, ini); 2288 2289 not_found: 2290 ini->smcr_version &= ~SMC_V2; 2291 ini->smcrv2.ib_dev_v2 = NULL; 2292 ini->check_smcrv2 = false; 2293 } 2294 2295 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 2296 struct smc_clc_msg_proposal *pclc, 2297 struct smc_init_info *ini) 2298 { 2299 int rc; 2300 2301 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 2302 return SMC_CLC_DECL_NOSMCDEV; 2303 2304 /* prepare RDMA check */ 2305 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2306 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 2307 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2308 rc = smc_find_rdma_device(new_smc, ini); 2309 if (rc) { 2310 /* no RDMA device found */ 2311 return SMC_CLC_DECL_NOSMCDEV; 2312 } 2313 rc = smc_listen_rdma_init(new_smc, ini); 2314 if (rc) 2315 return rc; 2316 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2317 } 2318 2319 /* determine the local device matching to proposal */ 2320 static int smc_listen_find_device(struct smc_sock *new_smc, 2321 struct smc_clc_msg_proposal *pclc, 2322 struct smc_init_info *ini) 2323 { 2324 int prfx_rc; 2325 2326 /* check for ISM device matching V2 proposed device */ 2327 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 2328 if (ini->ism_dev[0]) 2329 return 0; 2330 2331 /* check for matching IP prefix and subnet length (V1) */ 2332 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 2333 if (prfx_rc) 2334 smc_find_ism_store_rc(prfx_rc, ini); 2335 2336 /* get vlan id from IP device */ 2337 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 2338 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 2339 2340 /* check for ISM device matching V1 proposed device */ 2341 if (!prfx_rc) 2342 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 2343 if (ini->ism_dev[0]) 2344 return 0; 2345 2346 if (!smcr_indicated(pclc->hdr.typev1) && 2347 !smcr_indicated(pclc->hdr.typev2)) 2348 /* skip RDMA and decline */ 2349 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 2350 2351 /* check if RDMA V2 is available */ 2352 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 2353 if (ini->smcrv2.ib_dev_v2) 2354 return 0; 2355 2356 /* check if RDMA V1 is available */ 2357 if (!prfx_rc) { 2358 int rc; 2359 2360 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 2361 smc_find_ism_store_rc(rc, ini); 2362 return (!rc) ? 0 : ini->rc; 2363 } 2364 return SMC_CLC_DECL_NOSMCDEV; 2365 } 2366 2367 /* listen worker: finish RDMA setup */ 2368 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 2369 struct smc_clc_msg_accept_confirm *cclc, 2370 bool local_first, 2371 struct smc_init_info *ini) 2372 { 2373 struct smc_link *link = new_smc->conn.lnk; 2374 int reason_code = 0; 2375 2376 if (local_first) 2377 smc_link_save_peer_info(link, cclc, ini); 2378 2379 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 2380 return SMC_CLC_DECL_ERR_RTOK; 2381 2382 if (local_first) { 2383 if (smc_ib_ready_link(link)) 2384 return SMC_CLC_DECL_ERR_RDYLNK; 2385 /* QP confirmation over RoCE fabric */ 2386 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 2387 reason_code = smcr_serv_conf_first_link(new_smc); 2388 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 2389 } 2390 return reason_code; 2391 } 2392 2393 /* setup for connection of server */ 2394 static void smc_listen_work(struct work_struct *work) 2395 { 2396 struct smc_sock *new_smc = container_of(work, struct smc_sock, 2397 smc_listen_work); 2398 struct socket *newclcsock = new_smc->clcsock; 2399 struct smc_clc_msg_accept_confirm *cclc; 2400 struct smc_clc_msg_proposal_area *buf; 2401 struct smc_clc_msg_proposal *pclc; 2402 struct smc_init_info *ini = NULL; 2403 u8 proposal_version = SMC_V1; 2404 u8 accept_version; 2405 int rc = 0; 2406 2407 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 2408 return smc_listen_out_err(new_smc); 2409 2410 if (new_smc->use_fallback) { 2411 smc_listen_out_connected(new_smc); 2412 return; 2413 } 2414 2415 /* check if peer is smc capable */ 2416 if (!tcp_sk(newclcsock->sk)->syn_smc) { 2417 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 2418 if (rc) 2419 smc_listen_out_err(new_smc); 2420 else 2421 smc_listen_out_connected(new_smc); 2422 return; 2423 } 2424 2425 /* do inband token exchange - 2426 * wait for and receive SMC Proposal CLC message 2427 */ 2428 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 2429 if (!buf) { 2430 rc = SMC_CLC_DECL_MEM; 2431 goto out_decl; 2432 } 2433 pclc = (struct smc_clc_msg_proposal *)buf; 2434 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2435 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2436 if (rc) 2437 goto out_decl; 2438 2439 if (pclc->hdr.version > SMC_V1) 2440 proposal_version = SMC_V2; 2441 2442 /* IPSec connections opt out of SMC optimizations */ 2443 if (using_ipsec(new_smc)) { 2444 rc = SMC_CLC_DECL_IPSEC; 2445 goto out_decl; 2446 } 2447 2448 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2449 if (!ini) { 2450 rc = SMC_CLC_DECL_MEM; 2451 goto out_decl; 2452 } 2453 2454 /* initial version checking */ 2455 rc = smc_listen_v2_check(new_smc, pclc, ini); 2456 if (rc) 2457 goto out_decl; 2458 2459 rc = smc_clc_srv_v2x_features_validate(pclc, ini); 2460 if (rc) 2461 goto out_decl; 2462 2463 mutex_lock(&smc_server_lgr_pending); 2464 smc_close_init(new_smc); 2465 smc_rx_init(new_smc); 2466 smc_tx_init(new_smc); 2467 2468 /* determine ISM or RoCE device used for connection */ 2469 rc = smc_listen_find_device(new_smc, pclc, ini); 2470 if (rc) 2471 goto out_unlock; 2472 2473 /* send SMC Accept CLC message */ 2474 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2475 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2476 accept_version, ini->negotiated_eid, ini); 2477 if (rc) 2478 goto out_unlock; 2479 2480 /* SMC-D does not need this lock any more */ 2481 if (ini->is_smcd) 2482 mutex_unlock(&smc_server_lgr_pending); 2483 2484 /* receive SMC Confirm CLC message */ 2485 memset(buf, 0, sizeof(*buf)); 2486 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2487 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2488 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2489 if (rc) { 2490 if (!ini->is_smcd) 2491 goto out_unlock; 2492 goto out_decl; 2493 } 2494 2495 rc = smc_clc_v2x_features_confirm_check(cclc, ini); 2496 if (rc) { 2497 if (!ini->is_smcd) 2498 goto out_unlock; 2499 goto out_decl; 2500 } 2501 2502 /* fce smc release version is needed in smc_listen_rdma_finish, 2503 * so save fce info here. 2504 */ 2505 smc_conn_save_peer_info_fce(new_smc, cclc); 2506 2507 /* finish worker */ 2508 if (!ini->is_smcd) { 2509 rc = smc_listen_rdma_finish(new_smc, cclc, 2510 ini->first_contact_local, ini); 2511 if (rc) 2512 goto out_unlock; 2513 mutex_unlock(&smc_server_lgr_pending); 2514 } 2515 smc_conn_save_peer_info(new_smc, cclc); 2516 smc_listen_out_connected(new_smc); 2517 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2518 goto out_free; 2519 2520 out_unlock: 2521 mutex_unlock(&smc_server_lgr_pending); 2522 out_decl: 2523 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2524 proposal_version); 2525 out_free: 2526 kfree(ini); 2527 kfree(buf); 2528 } 2529 2530 static void smc_tcp_listen_work(struct work_struct *work) 2531 { 2532 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2533 tcp_listen_work); 2534 struct sock *lsk = &lsmc->sk; 2535 struct smc_sock *new_smc; 2536 int rc = 0; 2537 2538 lock_sock(lsk); 2539 while (lsk->sk_state == SMC_LISTEN) { 2540 rc = smc_clcsock_accept(lsmc, &new_smc); 2541 if (rc) /* clcsock accept queue empty or error */ 2542 goto out; 2543 if (!new_smc) 2544 continue; 2545 2546 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 2547 atomic_inc(&lsmc->queued_smc_hs); 2548 2549 new_smc->listen_smc = lsmc; 2550 new_smc->use_fallback = lsmc->use_fallback; 2551 new_smc->fallback_rsn = lsmc->fallback_rsn; 2552 sock_hold(lsk); /* sock_put in smc_listen_work */ 2553 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2554 smc_copy_sock_settings_to_smc(new_smc); 2555 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2556 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2557 sock_put(&new_smc->sk); 2558 } 2559 2560 out: 2561 release_sock(lsk); 2562 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2563 } 2564 2565 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2566 { 2567 struct smc_sock *lsmc; 2568 2569 read_lock_bh(&listen_clcsock->sk_callback_lock); 2570 lsmc = smc_clcsock_user_data(listen_clcsock); 2571 if (!lsmc) 2572 goto out; 2573 lsmc->clcsk_data_ready(listen_clcsock); 2574 if (lsmc->sk.sk_state == SMC_LISTEN) { 2575 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2576 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work)) 2577 sock_put(&lsmc->sk); 2578 } 2579 out: 2580 read_unlock_bh(&listen_clcsock->sk_callback_lock); 2581 } 2582 2583 static int smc_listen(struct socket *sock, int backlog) 2584 { 2585 struct sock *sk = sock->sk; 2586 struct smc_sock *smc; 2587 int rc; 2588 2589 smc = smc_sk(sk); 2590 lock_sock(sk); 2591 2592 rc = -EINVAL; 2593 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2594 smc->connect_nonblock || sock->state != SS_UNCONNECTED) 2595 goto out; 2596 2597 rc = 0; 2598 if (sk->sk_state == SMC_LISTEN) { 2599 sk->sk_max_ack_backlog = backlog; 2600 goto out; 2601 } 2602 /* some socket options are handled in core, so we could not apply 2603 * them to the clc socket -- copy smc socket options to clc socket 2604 */ 2605 smc_copy_sock_settings_to_clc(smc); 2606 if (!smc->use_fallback) 2607 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2608 2609 /* save original sk_data_ready function and establish 2610 * smc-specific sk_data_ready function 2611 */ 2612 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2613 smc->clcsock->sk->sk_user_data = 2614 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2615 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready, 2616 smc_clcsock_data_ready, &smc->clcsk_data_ready); 2617 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2618 2619 /* save original ops */ 2620 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops; 2621 2622 smc->af_ops = *smc->ori_af_ops; 2623 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock; 2624 2625 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; 2626 2627 if (smc->limit_smc_hs) 2628 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; 2629 2630 rc = kernel_listen(smc->clcsock, backlog); 2631 if (rc) { 2632 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2633 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready, 2634 &smc->clcsk_data_ready); 2635 smc->clcsock->sk->sk_user_data = NULL; 2636 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2637 goto out; 2638 } 2639 sk->sk_max_ack_backlog = backlog; 2640 sk->sk_ack_backlog = 0; 2641 sk->sk_state = SMC_LISTEN; 2642 2643 out: 2644 release_sock(sk); 2645 return rc; 2646 } 2647 2648 static int smc_accept(struct socket *sock, struct socket *new_sock, 2649 int flags, bool kern) 2650 { 2651 struct sock *sk = sock->sk, *nsk; 2652 DECLARE_WAITQUEUE(wait, current); 2653 struct smc_sock *lsmc; 2654 long timeo; 2655 int rc = 0; 2656 2657 lsmc = smc_sk(sk); 2658 sock_hold(sk); /* sock_put below */ 2659 lock_sock(sk); 2660 2661 if (lsmc->sk.sk_state != SMC_LISTEN) { 2662 rc = -EINVAL; 2663 release_sock(sk); 2664 goto out; 2665 } 2666 2667 /* Wait for an incoming connection */ 2668 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2669 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2670 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2671 set_current_state(TASK_INTERRUPTIBLE); 2672 if (!timeo) { 2673 rc = -EAGAIN; 2674 break; 2675 } 2676 release_sock(sk); 2677 timeo = schedule_timeout(timeo); 2678 /* wakeup by sk_data_ready in smc_listen_work() */ 2679 sched_annotate_sleep(); 2680 lock_sock(sk); 2681 if (signal_pending(current)) { 2682 rc = sock_intr_errno(timeo); 2683 break; 2684 } 2685 } 2686 set_current_state(TASK_RUNNING); 2687 remove_wait_queue(sk_sleep(sk), &wait); 2688 2689 if (!rc) 2690 rc = sock_error(nsk); 2691 release_sock(sk); 2692 if (rc) 2693 goto out; 2694 2695 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 2696 /* wait till data arrives on the socket */ 2697 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 2698 MSEC_PER_SEC); 2699 if (smc_sk(nsk)->use_fallback) { 2700 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2701 2702 lock_sock(clcsk); 2703 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2704 sk_wait_data(clcsk, &timeo, NULL); 2705 release_sock(clcsk); 2706 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2707 lock_sock(nsk); 2708 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 2709 release_sock(nsk); 2710 } 2711 } 2712 2713 out: 2714 sock_put(sk); /* sock_hold above */ 2715 return rc; 2716 } 2717 2718 static int smc_getname(struct socket *sock, struct sockaddr *addr, 2719 int peer) 2720 { 2721 struct smc_sock *smc; 2722 2723 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2724 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2725 return -ENOTCONN; 2726 2727 smc = smc_sk(sock->sk); 2728 2729 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2730 } 2731 2732 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2733 { 2734 struct sock *sk = sock->sk; 2735 struct smc_sock *smc; 2736 int rc; 2737 2738 smc = smc_sk(sk); 2739 lock_sock(sk); 2740 2741 /* SMC does not support connect with fastopen */ 2742 if (msg->msg_flags & MSG_FASTOPEN) { 2743 /* not connected yet, fallback */ 2744 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2745 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2746 if (rc) 2747 goto out; 2748 } else { 2749 rc = -EINVAL; 2750 goto out; 2751 } 2752 } else if ((sk->sk_state != SMC_ACTIVE) && 2753 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2754 (sk->sk_state != SMC_INIT)) { 2755 rc = -EPIPE; 2756 goto out; 2757 } 2758 2759 if (smc->use_fallback) { 2760 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2761 } else { 2762 rc = smc_tx_sendmsg(smc, msg, len); 2763 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2764 } 2765 out: 2766 release_sock(sk); 2767 return rc; 2768 } 2769 2770 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2771 int flags) 2772 { 2773 struct sock *sk = sock->sk; 2774 struct smc_sock *smc; 2775 int rc = -ENOTCONN; 2776 2777 smc = smc_sk(sk); 2778 lock_sock(sk); 2779 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2780 /* socket was connected before, no more data to read */ 2781 rc = 0; 2782 goto out; 2783 } 2784 if ((sk->sk_state == SMC_INIT) || 2785 (sk->sk_state == SMC_LISTEN) || 2786 (sk->sk_state == SMC_CLOSED)) 2787 goto out; 2788 2789 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2790 rc = 0; 2791 goto out; 2792 } 2793 2794 if (smc->use_fallback) { 2795 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2796 } else { 2797 msg->msg_namelen = 0; 2798 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2799 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2800 } 2801 2802 out: 2803 release_sock(sk); 2804 return rc; 2805 } 2806 2807 static __poll_t smc_accept_poll(struct sock *parent) 2808 { 2809 struct smc_sock *isk = smc_sk(parent); 2810 __poll_t mask = 0; 2811 2812 spin_lock(&isk->accept_q_lock); 2813 if (!list_empty(&isk->accept_q)) 2814 mask = EPOLLIN | EPOLLRDNORM; 2815 spin_unlock(&isk->accept_q_lock); 2816 2817 return mask; 2818 } 2819 2820 static __poll_t smc_poll(struct file *file, struct socket *sock, 2821 poll_table *wait) 2822 { 2823 struct sock *sk = sock->sk; 2824 struct smc_sock *smc; 2825 __poll_t mask = 0; 2826 2827 if (!sk) 2828 return EPOLLNVAL; 2829 2830 smc = smc_sk(sock->sk); 2831 if (smc->use_fallback) { 2832 /* delegate to CLC child sock */ 2833 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2834 sk->sk_err = smc->clcsock->sk->sk_err; 2835 } else { 2836 if (sk->sk_state != SMC_CLOSED) 2837 sock_poll_wait(file, sock, wait); 2838 if (sk->sk_err) 2839 mask |= EPOLLERR; 2840 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2841 (sk->sk_state == SMC_CLOSED)) 2842 mask |= EPOLLHUP; 2843 if (sk->sk_state == SMC_LISTEN) { 2844 /* woken up by sk_data_ready in smc_listen_work() */ 2845 mask |= smc_accept_poll(sk); 2846 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2847 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2848 wait); 2849 sk->sk_err = smc->clcsock->sk->sk_err; 2850 } else { 2851 if ((sk->sk_state != SMC_INIT && 2852 atomic_read(&smc->conn.sndbuf_space)) || 2853 sk->sk_shutdown & SEND_SHUTDOWN) { 2854 mask |= EPOLLOUT | EPOLLWRNORM; 2855 } else { 2856 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2857 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2858 } 2859 if (atomic_read(&smc->conn.bytes_to_rcv)) 2860 mask |= EPOLLIN | EPOLLRDNORM; 2861 if (sk->sk_shutdown & RCV_SHUTDOWN) 2862 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2863 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2864 mask |= EPOLLIN; 2865 if (smc->conn.urg_state == SMC_URG_VALID) 2866 mask |= EPOLLPRI; 2867 } 2868 } 2869 2870 return mask; 2871 } 2872 2873 static int smc_shutdown(struct socket *sock, int how) 2874 { 2875 struct sock *sk = sock->sk; 2876 bool do_shutdown = true; 2877 struct smc_sock *smc; 2878 int rc = -EINVAL; 2879 int old_state; 2880 int rc1 = 0; 2881 2882 smc = smc_sk(sk); 2883 2884 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2885 return rc; 2886 2887 lock_sock(sk); 2888 2889 if (sock->state == SS_CONNECTING) { 2890 if (sk->sk_state == SMC_ACTIVE) 2891 sock->state = SS_CONNECTED; 2892 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 || 2893 sk->sk_state == SMC_PEERCLOSEWAIT2 || 2894 sk->sk_state == SMC_APPCLOSEWAIT1 || 2895 sk->sk_state == SMC_APPCLOSEWAIT2 || 2896 sk->sk_state == SMC_APPFINCLOSEWAIT) 2897 sock->state = SS_DISCONNECTING; 2898 } 2899 2900 rc = -ENOTCONN; 2901 if ((sk->sk_state != SMC_ACTIVE) && 2902 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2903 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2904 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2905 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2906 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2907 goto out; 2908 if (smc->use_fallback) { 2909 rc = kernel_sock_shutdown(smc->clcsock, how); 2910 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2911 if (sk->sk_shutdown == SHUTDOWN_MASK) { 2912 sk->sk_state = SMC_CLOSED; 2913 sk->sk_socket->state = SS_UNCONNECTED; 2914 sock_put(sk); 2915 } 2916 goto out; 2917 } 2918 switch (how) { 2919 case SHUT_RDWR: /* shutdown in both directions */ 2920 old_state = sk->sk_state; 2921 rc = smc_close_active(smc); 2922 if (old_state == SMC_ACTIVE && 2923 sk->sk_state == SMC_PEERCLOSEWAIT1) 2924 do_shutdown = false; 2925 break; 2926 case SHUT_WR: 2927 rc = smc_close_shutdown_write(smc); 2928 break; 2929 case SHUT_RD: 2930 rc = 0; 2931 /* nothing more to do because peer is not involved */ 2932 break; 2933 } 2934 if (do_shutdown && smc->clcsock) 2935 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2936 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2937 sk->sk_shutdown |= how + 1; 2938 2939 if (sk->sk_state == SMC_CLOSED) 2940 sock->state = SS_UNCONNECTED; 2941 else 2942 sock->state = SS_DISCONNECTING; 2943 out: 2944 release_sock(sk); 2945 return rc ? rc : rc1; 2946 } 2947 2948 static int __smc_getsockopt(struct socket *sock, int level, int optname, 2949 char __user *optval, int __user *optlen) 2950 { 2951 struct smc_sock *smc; 2952 int val, len; 2953 2954 smc = smc_sk(sock->sk); 2955 2956 if (get_user(len, optlen)) 2957 return -EFAULT; 2958 2959 len = min_t(int, len, sizeof(int)); 2960 2961 if (len < 0) 2962 return -EINVAL; 2963 2964 switch (optname) { 2965 case SMC_LIMIT_HS: 2966 val = smc->limit_smc_hs; 2967 break; 2968 default: 2969 return -EOPNOTSUPP; 2970 } 2971 2972 if (put_user(len, optlen)) 2973 return -EFAULT; 2974 if (copy_to_user(optval, &val, len)) 2975 return -EFAULT; 2976 2977 return 0; 2978 } 2979 2980 static int __smc_setsockopt(struct socket *sock, int level, int optname, 2981 sockptr_t optval, unsigned int optlen) 2982 { 2983 struct sock *sk = sock->sk; 2984 struct smc_sock *smc; 2985 int val, rc; 2986 2987 smc = smc_sk(sk); 2988 2989 lock_sock(sk); 2990 switch (optname) { 2991 case SMC_LIMIT_HS: 2992 if (optlen < sizeof(int)) { 2993 rc = -EINVAL; 2994 break; 2995 } 2996 if (copy_from_sockptr(&val, optval, sizeof(int))) { 2997 rc = -EFAULT; 2998 break; 2999 } 3000 3001 smc->limit_smc_hs = !!val; 3002 rc = 0; 3003 break; 3004 default: 3005 rc = -EOPNOTSUPP; 3006 break; 3007 } 3008 release_sock(sk); 3009 3010 return rc; 3011 } 3012 3013 static int smc_setsockopt(struct socket *sock, int level, int optname, 3014 sockptr_t optval, unsigned int optlen) 3015 { 3016 struct sock *sk = sock->sk; 3017 struct smc_sock *smc; 3018 int val, rc; 3019 3020 if (level == SOL_TCP && optname == TCP_ULP) 3021 return -EOPNOTSUPP; 3022 else if (level == SOL_SMC) 3023 return __smc_setsockopt(sock, level, optname, optval, optlen); 3024 3025 smc = smc_sk(sk); 3026 3027 /* generic setsockopts reaching us here always apply to the 3028 * CLC socket 3029 */ 3030 mutex_lock(&smc->clcsock_release_lock); 3031 if (!smc->clcsock) { 3032 mutex_unlock(&smc->clcsock_release_lock); 3033 return -EBADF; 3034 } 3035 if (unlikely(!smc->clcsock->ops->setsockopt)) 3036 rc = -EOPNOTSUPP; 3037 else 3038 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 3039 optval, optlen); 3040 if (smc->clcsock->sk->sk_err) { 3041 sk->sk_err = smc->clcsock->sk->sk_err; 3042 sk_error_report(sk); 3043 } 3044 mutex_unlock(&smc->clcsock_release_lock); 3045 3046 if (optlen < sizeof(int)) 3047 return -EINVAL; 3048 if (copy_from_sockptr(&val, optval, sizeof(int))) 3049 return -EFAULT; 3050 3051 lock_sock(sk); 3052 if (rc || smc->use_fallback) 3053 goto out; 3054 switch (optname) { 3055 case TCP_FASTOPEN: 3056 case TCP_FASTOPEN_CONNECT: 3057 case TCP_FASTOPEN_KEY: 3058 case TCP_FASTOPEN_NO_COOKIE: 3059 /* option not supported by SMC */ 3060 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 3061 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 3062 } else { 3063 rc = -EINVAL; 3064 } 3065 break; 3066 case TCP_NODELAY: 3067 if (sk->sk_state != SMC_INIT && 3068 sk->sk_state != SMC_LISTEN && 3069 sk->sk_state != SMC_CLOSED) { 3070 if (val) { 3071 SMC_STAT_INC(smc, ndly_cnt); 3072 smc_tx_pending(&smc->conn); 3073 cancel_delayed_work(&smc->conn.tx_work); 3074 } 3075 } 3076 break; 3077 case TCP_CORK: 3078 if (sk->sk_state != SMC_INIT && 3079 sk->sk_state != SMC_LISTEN && 3080 sk->sk_state != SMC_CLOSED) { 3081 if (!val) { 3082 SMC_STAT_INC(smc, cork_cnt); 3083 smc_tx_pending(&smc->conn); 3084 cancel_delayed_work(&smc->conn.tx_work); 3085 } 3086 } 3087 break; 3088 case TCP_DEFER_ACCEPT: 3089 smc->sockopt_defer_accept = val; 3090 break; 3091 default: 3092 break; 3093 } 3094 out: 3095 release_sock(sk); 3096 3097 return rc; 3098 } 3099 3100 static int smc_getsockopt(struct socket *sock, int level, int optname, 3101 char __user *optval, int __user *optlen) 3102 { 3103 struct smc_sock *smc; 3104 int rc; 3105 3106 if (level == SOL_SMC) 3107 return __smc_getsockopt(sock, level, optname, optval, optlen); 3108 3109 smc = smc_sk(sock->sk); 3110 mutex_lock(&smc->clcsock_release_lock); 3111 if (!smc->clcsock) { 3112 mutex_unlock(&smc->clcsock_release_lock); 3113 return -EBADF; 3114 } 3115 /* socket options apply to the CLC socket */ 3116 if (unlikely(!smc->clcsock->ops->getsockopt)) { 3117 mutex_unlock(&smc->clcsock_release_lock); 3118 return -EOPNOTSUPP; 3119 } 3120 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 3121 optval, optlen); 3122 mutex_unlock(&smc->clcsock_release_lock); 3123 return rc; 3124 } 3125 3126 static int smc_ioctl(struct socket *sock, unsigned int cmd, 3127 unsigned long arg) 3128 { 3129 union smc_host_cursor cons, urg; 3130 struct smc_connection *conn; 3131 struct smc_sock *smc; 3132 int answ; 3133 3134 smc = smc_sk(sock->sk); 3135 conn = &smc->conn; 3136 lock_sock(&smc->sk); 3137 if (smc->use_fallback) { 3138 if (!smc->clcsock) { 3139 release_sock(&smc->sk); 3140 return -EBADF; 3141 } 3142 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 3143 release_sock(&smc->sk); 3144 return answ; 3145 } 3146 switch (cmd) { 3147 case SIOCINQ: /* same as FIONREAD */ 3148 if (smc->sk.sk_state == SMC_LISTEN) { 3149 release_sock(&smc->sk); 3150 return -EINVAL; 3151 } 3152 if (smc->sk.sk_state == SMC_INIT || 3153 smc->sk.sk_state == SMC_CLOSED) 3154 answ = 0; 3155 else 3156 answ = atomic_read(&smc->conn.bytes_to_rcv); 3157 break; 3158 case SIOCOUTQ: 3159 /* output queue size (not send + not acked) */ 3160 if (smc->sk.sk_state == SMC_LISTEN) { 3161 release_sock(&smc->sk); 3162 return -EINVAL; 3163 } 3164 if (smc->sk.sk_state == SMC_INIT || 3165 smc->sk.sk_state == SMC_CLOSED) 3166 answ = 0; 3167 else 3168 answ = smc->conn.sndbuf_desc->len - 3169 atomic_read(&smc->conn.sndbuf_space); 3170 break; 3171 case SIOCOUTQNSD: 3172 /* output queue size (not send only) */ 3173 if (smc->sk.sk_state == SMC_LISTEN) { 3174 release_sock(&smc->sk); 3175 return -EINVAL; 3176 } 3177 if (smc->sk.sk_state == SMC_INIT || 3178 smc->sk.sk_state == SMC_CLOSED) 3179 answ = 0; 3180 else 3181 answ = smc_tx_prepared_sends(&smc->conn); 3182 break; 3183 case SIOCATMARK: 3184 if (smc->sk.sk_state == SMC_LISTEN) { 3185 release_sock(&smc->sk); 3186 return -EINVAL; 3187 } 3188 if (smc->sk.sk_state == SMC_INIT || 3189 smc->sk.sk_state == SMC_CLOSED) { 3190 answ = 0; 3191 } else { 3192 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 3193 smc_curs_copy(&urg, &conn->urg_curs, conn); 3194 answ = smc_curs_diff(conn->rmb_desc->len, 3195 &cons, &urg) == 1; 3196 } 3197 break; 3198 default: 3199 release_sock(&smc->sk); 3200 return -ENOIOCTLCMD; 3201 } 3202 release_sock(&smc->sk); 3203 3204 return put_user(answ, (int __user *)arg); 3205 } 3206 3207 /* Map the affected portions of the rmbe into an spd, note the number of bytes 3208 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 3209 * updates till whenever a respective page has been fully processed. 3210 * Note that subsequent recv() calls have to wait till all splice() processing 3211 * completed. 3212 */ 3213 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 3214 struct pipe_inode_info *pipe, size_t len, 3215 unsigned int flags) 3216 { 3217 struct sock *sk = sock->sk; 3218 struct smc_sock *smc; 3219 int rc = -ENOTCONN; 3220 3221 smc = smc_sk(sk); 3222 lock_sock(sk); 3223 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 3224 /* socket was connected before, no more data to read */ 3225 rc = 0; 3226 goto out; 3227 } 3228 if (sk->sk_state == SMC_INIT || 3229 sk->sk_state == SMC_LISTEN || 3230 sk->sk_state == SMC_CLOSED) 3231 goto out; 3232 3233 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 3234 rc = 0; 3235 goto out; 3236 } 3237 3238 if (smc->use_fallback) { 3239 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 3240 pipe, len, flags); 3241 } else { 3242 if (*ppos) { 3243 rc = -ESPIPE; 3244 goto out; 3245 } 3246 if (flags & SPLICE_F_NONBLOCK) 3247 flags = MSG_DONTWAIT; 3248 else 3249 flags = 0; 3250 SMC_STAT_INC(smc, splice_cnt); 3251 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 3252 } 3253 out: 3254 release_sock(sk); 3255 3256 return rc; 3257 } 3258 3259 /* must look like tcp */ 3260 static const struct proto_ops smc_sock_ops = { 3261 .family = PF_SMC, 3262 .owner = THIS_MODULE, 3263 .release = smc_release, 3264 .bind = smc_bind, 3265 .connect = smc_connect, 3266 .socketpair = sock_no_socketpair, 3267 .accept = smc_accept, 3268 .getname = smc_getname, 3269 .poll = smc_poll, 3270 .ioctl = smc_ioctl, 3271 .listen = smc_listen, 3272 .shutdown = smc_shutdown, 3273 .setsockopt = smc_setsockopt, 3274 .getsockopt = smc_getsockopt, 3275 .sendmsg = smc_sendmsg, 3276 .recvmsg = smc_recvmsg, 3277 .mmap = sock_no_mmap, 3278 .splice_read = smc_splice_read, 3279 }; 3280 3281 static int __smc_create(struct net *net, struct socket *sock, int protocol, 3282 int kern, struct socket *clcsock) 3283 { 3284 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 3285 struct smc_sock *smc; 3286 struct sock *sk; 3287 int rc; 3288 3289 rc = -ESOCKTNOSUPPORT; 3290 if (sock->type != SOCK_STREAM) 3291 goto out; 3292 3293 rc = -EPROTONOSUPPORT; 3294 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 3295 goto out; 3296 3297 rc = -ENOBUFS; 3298 sock->ops = &smc_sock_ops; 3299 sock->state = SS_UNCONNECTED; 3300 sk = smc_sock_alloc(net, sock, protocol); 3301 if (!sk) 3302 goto out; 3303 3304 /* create internal TCP socket for CLC handshake and fallback */ 3305 smc = smc_sk(sk); 3306 smc->use_fallback = false; /* assume rdma capability first */ 3307 smc->fallback_rsn = 0; 3308 3309 /* default behavior from limit_smc_hs in every net namespace */ 3310 smc->limit_smc_hs = net->smc.limit_smc_hs; 3311 3312 rc = 0; 3313 if (!clcsock) { 3314 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 3315 &smc->clcsock); 3316 if (rc) { 3317 sk_common_release(sk); 3318 goto out; 3319 } 3320 3321 /* smc_clcsock_release() does not wait smc->clcsock->sk's 3322 * destruction; its sk_state might not be TCP_CLOSE after 3323 * smc->sk is close()d, and TCP timers can be fired later, 3324 * which need net ref. 3325 */ 3326 sk = smc->clcsock->sk; 3327 __netns_tracker_free(net, &sk->ns_tracker, false); 3328 sk->sk_net_refcnt = 1; 3329 get_net_track(net, &sk->ns_tracker, GFP_KERNEL); 3330 sock_inuse_add(net, 1); 3331 } else { 3332 smc->clcsock = clcsock; 3333 } 3334 3335 out: 3336 return rc; 3337 } 3338 3339 static int smc_create(struct net *net, struct socket *sock, int protocol, 3340 int kern) 3341 { 3342 return __smc_create(net, sock, protocol, kern, NULL); 3343 } 3344 3345 static const struct net_proto_family smc_sock_family_ops = { 3346 .family = PF_SMC, 3347 .owner = THIS_MODULE, 3348 .create = smc_create, 3349 }; 3350 3351 static int smc_ulp_init(struct sock *sk) 3352 { 3353 struct socket *tcp = sk->sk_socket; 3354 struct net *net = sock_net(sk); 3355 struct socket *smcsock; 3356 int protocol, ret; 3357 3358 /* only TCP can be replaced */ 3359 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 3360 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 3361 return -ESOCKTNOSUPPORT; 3362 /* don't handle wq now */ 3363 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 3364 return -ENOTCONN; 3365 3366 if (sk->sk_family == AF_INET) 3367 protocol = SMCPROTO_SMC; 3368 else 3369 protocol = SMCPROTO_SMC6; 3370 3371 smcsock = sock_alloc(); 3372 if (!smcsock) 3373 return -ENFILE; 3374 3375 smcsock->type = SOCK_STREAM; 3376 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 3377 ret = __smc_create(net, smcsock, protocol, 1, tcp); 3378 if (ret) { 3379 sock_release(smcsock); /* module_put() which ops won't be NULL */ 3380 return ret; 3381 } 3382 3383 /* replace tcp socket to smc */ 3384 smcsock->file = tcp->file; 3385 smcsock->file->private_data = smcsock; 3386 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 3387 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 3388 tcp->file = NULL; 3389 3390 return ret; 3391 } 3392 3393 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 3394 const gfp_t priority) 3395 { 3396 struct inet_connection_sock *icsk = inet_csk(newsk); 3397 3398 /* don't inherit ulp ops to child when listen */ 3399 icsk->icsk_ulp_ops = NULL; 3400 } 3401 3402 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 3403 .name = "smc", 3404 .owner = THIS_MODULE, 3405 .init = smc_ulp_init, 3406 .clone = smc_ulp_clone, 3407 }; 3408 3409 unsigned int smc_net_id; 3410 3411 static __net_init int smc_net_init(struct net *net) 3412 { 3413 int rc; 3414 3415 rc = smc_sysctl_net_init(net); 3416 if (rc) 3417 return rc; 3418 return smc_pnet_net_init(net); 3419 } 3420 3421 static void __net_exit smc_net_exit(struct net *net) 3422 { 3423 smc_sysctl_net_exit(net); 3424 smc_pnet_net_exit(net); 3425 } 3426 3427 static __net_init int smc_net_stat_init(struct net *net) 3428 { 3429 return smc_stats_init(net); 3430 } 3431 3432 static void __net_exit smc_net_stat_exit(struct net *net) 3433 { 3434 smc_stats_exit(net); 3435 } 3436 3437 static struct pernet_operations smc_net_ops = { 3438 .init = smc_net_init, 3439 .exit = smc_net_exit, 3440 .id = &smc_net_id, 3441 .size = sizeof(struct smc_net), 3442 }; 3443 3444 static struct pernet_operations smc_net_stat_ops = { 3445 .init = smc_net_stat_init, 3446 .exit = smc_net_stat_exit, 3447 }; 3448 3449 static int __init smc_init(void) 3450 { 3451 int rc; 3452 3453 rc = register_pernet_subsys(&smc_net_ops); 3454 if (rc) 3455 return rc; 3456 3457 rc = register_pernet_subsys(&smc_net_stat_ops); 3458 if (rc) 3459 goto out_pernet_subsys; 3460 3461 rc = smc_ism_init(); 3462 if (rc) 3463 goto out_pernet_subsys_stat; 3464 smc_clc_init(); 3465 3466 rc = smc_nl_init(); 3467 if (rc) 3468 goto out_ism; 3469 3470 rc = smc_pnet_init(); 3471 if (rc) 3472 goto out_nl; 3473 3474 rc = -ENOMEM; 3475 3476 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0); 3477 if (!smc_tcp_ls_wq) 3478 goto out_pnet; 3479 3480 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 3481 if (!smc_hs_wq) 3482 goto out_alloc_tcp_ls_wq; 3483 3484 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 3485 if (!smc_close_wq) 3486 goto out_alloc_hs_wq; 3487 3488 rc = smc_core_init(); 3489 if (rc) { 3490 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 3491 goto out_alloc_wqs; 3492 } 3493 3494 rc = smc_llc_init(); 3495 if (rc) { 3496 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 3497 goto out_core; 3498 } 3499 3500 rc = smc_cdc_init(); 3501 if (rc) { 3502 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 3503 goto out_core; 3504 } 3505 3506 rc = proto_register(&smc_proto, 1); 3507 if (rc) { 3508 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 3509 goto out_core; 3510 } 3511 3512 rc = proto_register(&smc_proto6, 1); 3513 if (rc) { 3514 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 3515 goto out_proto; 3516 } 3517 3518 rc = sock_register(&smc_sock_family_ops); 3519 if (rc) { 3520 pr_err("%s: sock_register fails with %d\n", __func__, rc); 3521 goto out_proto6; 3522 } 3523 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 3524 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 3525 3526 rc = smc_ib_register_client(); 3527 if (rc) { 3528 pr_err("%s: ib_register fails with %d\n", __func__, rc); 3529 goto out_sock; 3530 } 3531 3532 rc = tcp_register_ulp(&smc_ulp_ops); 3533 if (rc) { 3534 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 3535 goto out_ib; 3536 } 3537 3538 static_branch_enable(&tcp_have_smc); 3539 return 0; 3540 3541 out_ib: 3542 smc_ib_unregister_client(); 3543 out_sock: 3544 sock_unregister(PF_SMC); 3545 out_proto6: 3546 proto_unregister(&smc_proto6); 3547 out_proto: 3548 proto_unregister(&smc_proto); 3549 out_core: 3550 smc_core_exit(); 3551 out_alloc_wqs: 3552 destroy_workqueue(smc_close_wq); 3553 out_alloc_hs_wq: 3554 destroy_workqueue(smc_hs_wq); 3555 out_alloc_tcp_ls_wq: 3556 destroy_workqueue(smc_tcp_ls_wq); 3557 out_pnet: 3558 smc_pnet_exit(); 3559 out_nl: 3560 smc_nl_exit(); 3561 out_ism: 3562 smc_clc_exit(); 3563 smc_ism_exit(); 3564 out_pernet_subsys_stat: 3565 unregister_pernet_subsys(&smc_net_stat_ops); 3566 out_pernet_subsys: 3567 unregister_pernet_subsys(&smc_net_ops); 3568 3569 return rc; 3570 } 3571 3572 static void __exit smc_exit(void) 3573 { 3574 static_branch_disable(&tcp_have_smc); 3575 tcp_unregister_ulp(&smc_ulp_ops); 3576 sock_unregister(PF_SMC); 3577 smc_core_exit(); 3578 smc_ib_unregister_client(); 3579 smc_ism_exit(); 3580 destroy_workqueue(smc_close_wq); 3581 destroy_workqueue(smc_tcp_ls_wq); 3582 destroy_workqueue(smc_hs_wq); 3583 proto_unregister(&smc_proto6); 3584 proto_unregister(&smc_proto); 3585 smc_pnet_exit(); 3586 smc_nl_exit(); 3587 smc_clc_exit(); 3588 unregister_pernet_subsys(&smc_net_stat_ops); 3589 unregister_pernet_subsys(&smc_net_ops); 3590 rcu_barrier(); 3591 } 3592 3593 module_init(smc_init); 3594 module_exit(smc_exit); 3595 3596 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3597 MODULE_DESCRIPTION("smc socket address family"); 3598 MODULE_LICENSE("GPL"); 3599 MODULE_ALIAS_NETPROTO(PF_SMC); 3600 MODULE_ALIAS_TCP_ULP("smc"); 3601 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME); 3602