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 struct net *net = sock_net(&smc->sk); 1205 int rc; 1206 1207 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 1208 return 0; 1209 1210 if (fce->v2_direct) { 1211 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 1212 ini->smcrv2.uses_gateway = false; 1213 } else { 1214 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr, 1215 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 1216 ini->smcrv2.nexthop_mac, 1217 &ini->smcrv2.uses_gateway)) 1218 return SMC_CLC_DECL_NOROUTE; 1219 if (!ini->smcrv2.uses_gateway) { 1220 /* mismatch: peer claims indirect, but its direct */ 1221 return SMC_CLC_DECL_NOINDIRECT; 1222 } 1223 } 1224 1225 ini->release_nr = fce->release; 1226 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1227 if (rc) 1228 return rc; 1229 1230 return 0; 1231 } 1232 1233 /* setup for RDMA connection of client */ 1234 static int smc_connect_rdma(struct smc_sock *smc, 1235 struct smc_clc_msg_accept_confirm *aclc, 1236 struct smc_init_info *ini) 1237 { 1238 int i, reason_code = 0; 1239 struct smc_link *link; 1240 u8 *eid = NULL; 1241 1242 ini->is_smcd = false; 1243 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 1244 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1245 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 1246 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 1247 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 1248 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1249 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1250 1251 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 1252 if (reason_code) 1253 return reason_code; 1254 1255 mutex_lock(&smc_client_lgr_pending); 1256 reason_code = smc_conn_create(smc, ini); 1257 if (reason_code) { 1258 mutex_unlock(&smc_client_lgr_pending); 1259 return reason_code; 1260 } 1261 1262 smc_conn_save_peer_info(smc, aclc); 1263 1264 if (ini->first_contact_local) { 1265 link = smc->conn.lnk; 1266 } else { 1267 /* set link that was assigned by server */ 1268 link = NULL; 1269 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1270 struct smc_link *l = &smc->conn.lgr->lnk[i]; 1271 1272 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 1273 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 1274 SMC_GID_SIZE) && 1275 (aclc->hdr.version > SMC_V1 || 1276 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 1277 sizeof(l->peer_mac)))) { 1278 link = l; 1279 break; 1280 } 1281 } 1282 if (!link) { 1283 reason_code = SMC_CLC_DECL_NOSRVLINK; 1284 goto connect_abort; 1285 } 1286 smc_switch_link_and_count(&smc->conn, link); 1287 } 1288 1289 /* create send buffer and rmb */ 1290 if (smc_buf_create(smc, false)) { 1291 reason_code = SMC_CLC_DECL_MEM; 1292 goto connect_abort; 1293 } 1294 1295 if (ini->first_contact_local) 1296 smc_link_save_peer_info(link, aclc, ini); 1297 1298 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 1299 reason_code = SMC_CLC_DECL_ERR_RTOK; 1300 goto connect_abort; 1301 } 1302 1303 smc_close_init(smc); 1304 smc_rx_init(smc); 1305 1306 if (ini->first_contact_local) { 1307 if (smc_ib_ready_link(link)) { 1308 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 1309 goto connect_abort; 1310 } 1311 } else { 1312 /* reg sendbufs if they were vzalloced */ 1313 if (smc->conn.sndbuf_desc->is_vm) { 1314 if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) { 1315 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1316 goto connect_abort; 1317 } 1318 } 1319 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 1320 reason_code = SMC_CLC_DECL_ERR_REGBUF; 1321 goto connect_abort; 1322 } 1323 } 1324 1325 if (aclc->hdr.version > SMC_V1) { 1326 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1327 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1328 1329 eid = clc_v2->r1.eid; 1330 if (ini->first_contact_local) 1331 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 1332 link->smcibdev, link->gid); 1333 } 1334 1335 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 1336 aclc->hdr.version, eid, ini); 1337 if (reason_code) 1338 goto connect_abort; 1339 1340 smc_tx_init(smc); 1341 1342 if (ini->first_contact_local) { 1343 /* QP confirmation over RoCE fabric */ 1344 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1345 reason_code = smcr_clnt_conf_first_link(smc); 1346 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1347 if (reason_code) 1348 goto connect_abort; 1349 } 1350 mutex_unlock(&smc_client_lgr_pending); 1351 1352 smc_copy_sock_settings_to_clc(smc); 1353 smc->connect_nonblock = 0; 1354 if (smc->sk.sk_state == SMC_INIT) 1355 smc->sk.sk_state = SMC_ACTIVE; 1356 1357 return 0; 1358 connect_abort: 1359 smc_conn_abort(smc, ini->first_contact_local); 1360 mutex_unlock(&smc_client_lgr_pending); 1361 smc->connect_nonblock = 0; 1362 1363 return reason_code; 1364 } 1365 1366 /* The server has chosen one of the proposed ISM devices for the communication. 1367 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1368 */ 1369 static int 1370 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 1371 struct smc_init_info *ini) 1372 { 1373 int i; 1374 1375 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1376 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1377 ini->ism_selected = i; 1378 return 0; 1379 } 1380 } 1381 1382 return -EPROTO; 1383 } 1384 1385 /* setup for ISM connection of client */ 1386 static int smc_connect_ism(struct smc_sock *smc, 1387 struct smc_clc_msg_accept_confirm *aclc, 1388 struct smc_init_info *ini) 1389 { 1390 u8 *eid = NULL; 1391 int rc = 0; 1392 1393 ini->is_smcd = true; 1394 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1395 1396 if (aclc->hdr.version == SMC_V2) { 1397 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 1398 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1399 1400 if (ini->first_contact_peer) { 1401 struct smc_clc_first_contact_ext *fce = 1402 smc_get_clc_first_contact_ext(aclc_v2, true); 1403 1404 ini->release_nr = fce->release; 1405 rc = smc_clc_clnt_v2x_features_validate(fce, ini); 1406 if (rc) 1407 return rc; 1408 } 1409 1410 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 1411 if (rc) 1412 return rc; 1413 } 1414 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 1415 1416 /* there is only one lgr role for SMC-D; use server lock */ 1417 mutex_lock(&smc_server_lgr_pending); 1418 rc = smc_conn_create(smc, ini); 1419 if (rc) { 1420 mutex_unlock(&smc_server_lgr_pending); 1421 return rc; 1422 } 1423 1424 /* Create send and receive buffers */ 1425 rc = smc_buf_create(smc, true); 1426 if (rc) { 1427 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1428 goto connect_abort; 1429 } 1430 1431 smc_conn_save_peer_info(smc, aclc); 1432 smc_close_init(smc); 1433 smc_rx_init(smc); 1434 smc_tx_init(smc); 1435 1436 if (aclc->hdr.version > SMC_V1) { 1437 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1438 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1439 1440 eid = clc_v2->d1.eid; 1441 } 1442 1443 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1444 aclc->hdr.version, eid, ini); 1445 if (rc) 1446 goto connect_abort; 1447 mutex_unlock(&smc_server_lgr_pending); 1448 1449 smc_copy_sock_settings_to_clc(smc); 1450 smc->connect_nonblock = 0; 1451 if (smc->sk.sk_state == SMC_INIT) 1452 smc->sk.sk_state = SMC_ACTIVE; 1453 1454 return 0; 1455 connect_abort: 1456 smc_conn_abort(smc, ini->first_contact_local); 1457 mutex_unlock(&smc_server_lgr_pending); 1458 smc->connect_nonblock = 0; 1459 1460 return rc; 1461 } 1462 1463 /* check if received accept type and version matches a proposed one */ 1464 static int smc_connect_check_aclc(struct smc_init_info *ini, 1465 struct smc_clc_msg_accept_confirm *aclc) 1466 { 1467 if (aclc->hdr.typev1 != SMC_TYPE_R && 1468 aclc->hdr.typev1 != SMC_TYPE_D) 1469 return SMC_CLC_DECL_MODEUNSUPP; 1470 1471 if (aclc->hdr.version >= SMC_V2) { 1472 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1473 !smcr_indicated(ini->smc_type_v2)) || 1474 (aclc->hdr.typev1 == SMC_TYPE_D && 1475 !smcd_indicated(ini->smc_type_v2))) 1476 return SMC_CLC_DECL_MODEUNSUPP; 1477 } else { 1478 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1479 !smcr_indicated(ini->smc_type_v1)) || 1480 (aclc->hdr.typev1 == SMC_TYPE_D && 1481 !smcd_indicated(ini->smc_type_v1))) 1482 return SMC_CLC_DECL_MODEUNSUPP; 1483 } 1484 1485 return 0; 1486 } 1487 1488 /* perform steps before actually connecting */ 1489 static int __smc_connect(struct smc_sock *smc) 1490 { 1491 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1492 struct smc_clc_msg_accept_confirm_v2 *aclc2; 1493 struct smc_clc_msg_accept_confirm *aclc; 1494 struct smc_init_info *ini = NULL; 1495 u8 *buf = NULL; 1496 int rc = 0; 1497 1498 if (smc->use_fallback) 1499 return smc_connect_fallback(smc, smc->fallback_rsn); 1500 1501 /* if peer has not signalled SMC-capability, fall back */ 1502 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1503 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1504 1505 /* IPSec connections opt out of SMC optimizations */ 1506 if (using_ipsec(smc)) 1507 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1508 version); 1509 1510 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1511 if (!ini) 1512 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1513 version); 1514 1515 ini->smcd_version = SMC_V1 | SMC_V2; 1516 ini->smcr_version = SMC_V1 | SMC_V2; 1517 ini->smc_type_v1 = SMC_TYPE_B; 1518 ini->smc_type_v2 = SMC_TYPE_B; 1519 1520 /* get vlan id from IP device */ 1521 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1522 ini->smcd_version &= ~SMC_V1; 1523 ini->smcr_version = 0; 1524 ini->smc_type_v1 = SMC_TYPE_N; 1525 if (!ini->smcd_version) { 1526 rc = SMC_CLC_DECL_GETVLANERR; 1527 goto fallback; 1528 } 1529 } 1530 1531 rc = smc_find_proposal_devices(smc, ini); 1532 if (rc) 1533 goto fallback; 1534 1535 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1536 if (!buf) { 1537 rc = SMC_CLC_DECL_MEM; 1538 goto fallback; 1539 } 1540 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1541 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1542 1543 /* perform CLC handshake */ 1544 rc = smc_connect_clc(smc, aclc2, ini); 1545 if (rc) { 1546 /* -EAGAIN on timeout, see tcp_recvmsg() */ 1547 if (rc == -EAGAIN) { 1548 rc = -ETIMEDOUT; 1549 smc->sk.sk_err = ETIMEDOUT; 1550 } 1551 goto vlan_cleanup; 1552 } 1553 1554 /* check if smc modes and versions of CLC proposal and accept match */ 1555 rc = smc_connect_check_aclc(ini, aclc); 1556 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1557 if (rc) 1558 goto vlan_cleanup; 1559 1560 /* depending on previous steps, connect using rdma or ism */ 1561 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1562 ini->smcr_version = version; 1563 rc = smc_connect_rdma(smc, aclc, ini); 1564 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1565 ini->smcd_version = version; 1566 rc = smc_connect_ism(smc, aclc, ini); 1567 } 1568 if (rc) 1569 goto vlan_cleanup; 1570 1571 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1572 smc_connect_ism_vlan_cleanup(smc, ini); 1573 kfree(buf); 1574 kfree(ini); 1575 return 0; 1576 1577 vlan_cleanup: 1578 smc_connect_ism_vlan_cleanup(smc, ini); 1579 kfree(buf); 1580 fallback: 1581 kfree(ini); 1582 return smc_connect_decline_fallback(smc, rc, version); 1583 } 1584 1585 static void smc_connect_work(struct work_struct *work) 1586 { 1587 struct smc_sock *smc = container_of(work, struct smc_sock, 1588 connect_work); 1589 long timeo = smc->sk.sk_sndtimeo; 1590 int rc = 0; 1591 1592 if (!timeo) 1593 timeo = MAX_SCHEDULE_TIMEOUT; 1594 lock_sock(smc->clcsock->sk); 1595 if (smc->clcsock->sk->sk_err) { 1596 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1597 } else if ((1 << smc->clcsock->sk->sk_state) & 1598 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1599 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1600 if ((rc == -EPIPE) && 1601 ((1 << smc->clcsock->sk->sk_state) & 1602 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1603 rc = 0; 1604 } 1605 release_sock(smc->clcsock->sk); 1606 lock_sock(&smc->sk); 1607 if (rc != 0 || smc->sk.sk_err) { 1608 smc->sk.sk_state = SMC_CLOSED; 1609 if (rc == -EPIPE || rc == -EAGAIN) 1610 smc->sk.sk_err = EPIPE; 1611 else if (rc == -ECONNREFUSED) 1612 smc->sk.sk_err = ECONNREFUSED; 1613 else if (signal_pending(current)) 1614 smc->sk.sk_err = -sock_intr_errno(timeo); 1615 sock_put(&smc->sk); /* passive closing */ 1616 goto out; 1617 } 1618 1619 rc = __smc_connect(smc); 1620 if (rc < 0) 1621 smc->sk.sk_err = -rc; 1622 1623 out: 1624 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1625 if (smc->sk.sk_err) { 1626 smc->sk.sk_state_change(&smc->sk); 1627 } else { /* allow polling before and after fallback decision */ 1628 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1629 smc->sk.sk_write_space(&smc->sk); 1630 } 1631 } 1632 release_sock(&smc->sk); 1633 } 1634 1635 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1636 int alen, int flags) 1637 { 1638 struct sock *sk = sock->sk; 1639 struct smc_sock *smc; 1640 int rc = -EINVAL; 1641 1642 smc = smc_sk(sk); 1643 1644 /* separate smc parameter checking to be safe */ 1645 if (alen < sizeof(addr->sa_family)) 1646 goto out_err; 1647 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1648 goto out_err; 1649 1650 lock_sock(sk); 1651 switch (sock->state) { 1652 default: 1653 rc = -EINVAL; 1654 goto out; 1655 case SS_CONNECTED: 1656 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL; 1657 goto out; 1658 case SS_CONNECTING: 1659 if (sk->sk_state == SMC_ACTIVE) 1660 goto connected; 1661 break; 1662 case SS_UNCONNECTED: 1663 sock->state = SS_CONNECTING; 1664 break; 1665 } 1666 1667 switch (sk->sk_state) { 1668 default: 1669 goto out; 1670 case SMC_CLOSED: 1671 rc = sock_error(sk) ? : -ECONNABORTED; 1672 sock->state = SS_UNCONNECTED; 1673 goto out; 1674 case SMC_ACTIVE: 1675 rc = -EISCONN; 1676 goto out; 1677 case SMC_INIT: 1678 break; 1679 } 1680 1681 smc_copy_sock_settings_to_clc(smc); 1682 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1683 if (smc->connect_nonblock) { 1684 rc = -EALREADY; 1685 goto out; 1686 } 1687 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1688 if (rc && rc != -EINPROGRESS) 1689 goto out; 1690 1691 if (smc->use_fallback) { 1692 sock->state = rc ? SS_CONNECTING : SS_CONNECTED; 1693 goto out; 1694 } 1695 sock_hold(&smc->sk); /* sock put in passive closing */ 1696 if (flags & O_NONBLOCK) { 1697 if (queue_work(smc_hs_wq, &smc->connect_work)) 1698 smc->connect_nonblock = 1; 1699 rc = -EINPROGRESS; 1700 goto out; 1701 } else { 1702 rc = __smc_connect(smc); 1703 if (rc < 0) 1704 goto out; 1705 } 1706 1707 connected: 1708 rc = 0; 1709 sock->state = SS_CONNECTED; 1710 out: 1711 release_sock(sk); 1712 out_err: 1713 return rc; 1714 } 1715 1716 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1717 { 1718 struct socket *new_clcsock = NULL; 1719 struct sock *lsk = &lsmc->sk; 1720 struct sock *new_sk; 1721 int rc = -EINVAL; 1722 1723 release_sock(lsk); 1724 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1725 if (!new_sk) { 1726 rc = -ENOMEM; 1727 lsk->sk_err = ENOMEM; 1728 *new_smc = NULL; 1729 lock_sock(lsk); 1730 goto out; 1731 } 1732 *new_smc = smc_sk(new_sk); 1733 1734 mutex_lock(&lsmc->clcsock_release_lock); 1735 if (lsmc->clcsock) 1736 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1737 mutex_unlock(&lsmc->clcsock_release_lock); 1738 lock_sock(lsk); 1739 if (rc < 0 && rc != -EAGAIN) 1740 lsk->sk_err = -rc; 1741 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1742 new_sk->sk_prot->unhash(new_sk); 1743 if (new_clcsock) 1744 sock_release(new_clcsock); 1745 new_sk->sk_state = SMC_CLOSED; 1746 sock_set_flag(new_sk, SOCK_DEAD); 1747 sock_put(new_sk); /* final */ 1748 *new_smc = NULL; 1749 goto out; 1750 } 1751 1752 /* new clcsock has inherited the smc listen-specific sk_data_ready 1753 * function; switch it back to the original sk_data_ready function 1754 */ 1755 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1756 1757 /* if new clcsock has also inherited the fallback-specific callback 1758 * functions, switch them back to the original ones. 1759 */ 1760 if (lsmc->use_fallback) { 1761 if (lsmc->clcsk_state_change) 1762 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change; 1763 if (lsmc->clcsk_write_space) 1764 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space; 1765 if (lsmc->clcsk_error_report) 1766 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report; 1767 } 1768 1769 (*new_smc)->clcsock = new_clcsock; 1770 out: 1771 return rc; 1772 } 1773 1774 /* add a just created sock to the accept queue of the listen sock as 1775 * candidate for a following socket accept call from user space 1776 */ 1777 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1778 { 1779 struct smc_sock *par = smc_sk(parent); 1780 1781 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1782 spin_lock(&par->accept_q_lock); 1783 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1784 spin_unlock(&par->accept_q_lock); 1785 sk_acceptq_added(parent); 1786 } 1787 1788 /* remove a socket from the accept queue of its parental listening socket */ 1789 static void smc_accept_unlink(struct sock *sk) 1790 { 1791 struct smc_sock *par = smc_sk(sk)->listen_smc; 1792 1793 spin_lock(&par->accept_q_lock); 1794 list_del_init(&smc_sk(sk)->accept_q); 1795 spin_unlock(&par->accept_q_lock); 1796 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1797 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1798 } 1799 1800 /* remove a sock from the accept queue to bind it to a new socket created 1801 * for a socket accept call from user space 1802 */ 1803 struct sock *smc_accept_dequeue(struct sock *parent, 1804 struct socket *new_sock) 1805 { 1806 struct smc_sock *isk, *n; 1807 struct sock *new_sk; 1808 1809 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1810 new_sk = (struct sock *)isk; 1811 1812 smc_accept_unlink(new_sk); 1813 if (new_sk->sk_state == SMC_CLOSED) { 1814 new_sk->sk_prot->unhash(new_sk); 1815 if (isk->clcsock) { 1816 sock_release(isk->clcsock); 1817 isk->clcsock = NULL; 1818 } 1819 sock_put(new_sk); /* final */ 1820 continue; 1821 } 1822 if (new_sock) { 1823 sock_graft(new_sk, new_sock); 1824 new_sock->state = SS_CONNECTED; 1825 if (isk->use_fallback) { 1826 smc_sk(new_sk)->clcsock->file = new_sock->file; 1827 isk->clcsock->file->private_data = isk->clcsock; 1828 } 1829 } 1830 return new_sk; 1831 } 1832 return NULL; 1833 } 1834 1835 /* clean up for a created but never accepted sock */ 1836 void smc_close_non_accepted(struct sock *sk) 1837 { 1838 struct smc_sock *smc = smc_sk(sk); 1839 1840 sock_hold(sk); /* sock_put below */ 1841 lock_sock(sk); 1842 if (!sk->sk_lingertime) 1843 /* wait for peer closing */ 1844 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT); 1845 __smc_release(smc); 1846 release_sock(sk); 1847 sock_put(sk); /* sock_hold above */ 1848 sock_put(sk); /* final sock_put */ 1849 } 1850 1851 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1852 { 1853 struct smc_link *link = smc->conn.lnk; 1854 struct smc_llc_qentry *qentry; 1855 int rc; 1856 1857 /* reg the sndbuf if it was vzalloced*/ 1858 if (smc->conn.sndbuf_desc->is_vm) { 1859 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc)) 1860 return SMC_CLC_DECL_ERR_REGBUF; 1861 } 1862 1863 /* reg the rmb */ 1864 if (smcr_link_reg_buf(link, smc->conn.rmb_desc)) 1865 return SMC_CLC_DECL_ERR_REGBUF; 1866 1867 /* send CONFIRM LINK request to client over the RoCE fabric */ 1868 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1869 if (rc < 0) 1870 return SMC_CLC_DECL_TIMEOUT_CL; 1871 1872 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1873 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1874 SMC_LLC_CONFIRM_LINK); 1875 if (!qentry) { 1876 struct smc_clc_msg_decline dclc; 1877 1878 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1879 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1880 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1881 } 1882 smc_llc_save_peer_uid(qentry); 1883 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1884 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1885 if (rc) 1886 return SMC_CLC_DECL_RMBE_EC; 1887 1888 /* confirm_rkey is implicit on 1st contact */ 1889 smc->conn.rmb_desc->is_conf_rkey = true; 1890 1891 smc_llc_link_active(link); 1892 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1893 1894 if (link->lgr->max_links > 1) { 1895 down_write(&link->lgr->llc_conf_mutex); 1896 /* initial contact - try to establish second link */ 1897 smc_llc_srv_add_link(link, NULL); 1898 up_write(&link->lgr->llc_conf_mutex); 1899 } 1900 return 0; 1901 } 1902 1903 /* listen worker: finish */ 1904 static void smc_listen_out(struct smc_sock *new_smc) 1905 { 1906 struct smc_sock *lsmc = new_smc->listen_smc; 1907 struct sock *newsmcsk = &new_smc->sk; 1908 1909 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 1910 atomic_dec(&lsmc->queued_smc_hs); 1911 1912 if (lsmc->sk.sk_state == SMC_LISTEN) { 1913 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1914 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1915 release_sock(&lsmc->sk); 1916 } else { /* no longer listening */ 1917 smc_close_non_accepted(newsmcsk); 1918 } 1919 1920 /* Wake up accept */ 1921 lsmc->sk.sk_data_ready(&lsmc->sk); 1922 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1923 } 1924 1925 /* listen worker: finish in state connected */ 1926 static void smc_listen_out_connected(struct smc_sock *new_smc) 1927 { 1928 struct sock *newsmcsk = &new_smc->sk; 1929 1930 if (newsmcsk->sk_state == SMC_INIT) 1931 newsmcsk->sk_state = SMC_ACTIVE; 1932 1933 smc_listen_out(new_smc); 1934 } 1935 1936 /* listen worker: finish in error state */ 1937 static void smc_listen_out_err(struct smc_sock *new_smc) 1938 { 1939 struct sock *newsmcsk = &new_smc->sk; 1940 struct net *net = sock_net(newsmcsk); 1941 1942 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1943 if (newsmcsk->sk_state == SMC_INIT) 1944 sock_put(&new_smc->sk); /* passive closing */ 1945 newsmcsk->sk_state = SMC_CLOSED; 1946 1947 smc_listen_out(new_smc); 1948 } 1949 1950 /* listen worker: decline and fall back if possible */ 1951 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1952 int local_first, u8 version) 1953 { 1954 /* RDMA setup failed, switch back to TCP */ 1955 smc_conn_abort(new_smc, local_first); 1956 if (reason_code < 0 || 1957 smc_switch_to_fallback(new_smc, reason_code)) { 1958 /* error, no fallback possible */ 1959 smc_listen_out_err(new_smc); 1960 return; 1961 } 1962 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1963 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1964 smc_listen_out_err(new_smc); 1965 return; 1966 } 1967 } 1968 smc_listen_out_connected(new_smc); 1969 } 1970 1971 /* listen worker: version checking */ 1972 static int smc_listen_v2_check(struct smc_sock *new_smc, 1973 struct smc_clc_msg_proposal *pclc, 1974 struct smc_init_info *ini) 1975 { 1976 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1977 struct smc_clc_v2_extension *pclc_v2_ext; 1978 int rc = SMC_CLC_DECL_PEERNOSMC; 1979 1980 ini->smc_type_v1 = pclc->hdr.typev1; 1981 ini->smc_type_v2 = pclc->hdr.typev2; 1982 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1983 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1984 if (pclc->hdr.version > SMC_V1) { 1985 if (smcd_indicated(ini->smc_type_v2)) 1986 ini->smcd_version |= SMC_V2; 1987 if (smcr_indicated(ini->smc_type_v2)) 1988 ini->smcr_version |= SMC_V2; 1989 } 1990 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 1991 rc = SMC_CLC_DECL_PEERNOSMC; 1992 goto out; 1993 } 1994 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1995 if (!pclc_v2_ext) { 1996 ini->smcd_version &= ~SMC_V2; 1997 ini->smcr_version &= ~SMC_V2; 1998 rc = SMC_CLC_DECL_NOV2EXT; 1999 goto out; 2000 } 2001 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 2002 if (ini->smcd_version & SMC_V2) { 2003 if (!smc_ism_is_v2_capable()) { 2004 ini->smcd_version &= ~SMC_V2; 2005 rc = SMC_CLC_DECL_NOISM2SUPP; 2006 } else if (!pclc_smcd_v2_ext) { 2007 ini->smcd_version &= ~SMC_V2; 2008 rc = SMC_CLC_DECL_NOV2DEXT; 2009 } else if (!pclc_v2_ext->hdr.eid_cnt && 2010 !pclc_v2_ext->hdr.flag.seid) { 2011 ini->smcd_version &= ~SMC_V2; 2012 rc = SMC_CLC_DECL_NOUEID; 2013 } 2014 } 2015 if (ini->smcr_version & SMC_V2) { 2016 if (!pclc_v2_ext->hdr.eid_cnt) { 2017 ini->smcr_version &= ~SMC_V2; 2018 rc = SMC_CLC_DECL_NOUEID; 2019 } 2020 } 2021 2022 ini->release_nr = pclc_v2_ext->hdr.flag.release; 2023 if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE) 2024 ini->release_nr = SMC_RELEASE; 2025 2026 out: 2027 if (!ini->smcd_version && !ini->smcr_version) 2028 return rc; 2029 2030 return 0; 2031 } 2032 2033 /* listen worker: check prefixes */ 2034 static int smc_listen_prfx_check(struct smc_sock *new_smc, 2035 struct smc_clc_msg_proposal *pclc) 2036 { 2037 struct smc_clc_msg_proposal_prefix *pclc_prfx; 2038 struct socket *newclcsock = new_smc->clcsock; 2039 2040 if (pclc->hdr.typev1 == SMC_TYPE_N) 2041 return 0; 2042 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 2043 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 2044 return SMC_CLC_DECL_DIFFPREFIX; 2045 2046 return 0; 2047 } 2048 2049 /* listen worker: initialize connection and buffers */ 2050 static int smc_listen_rdma_init(struct smc_sock *new_smc, 2051 struct smc_init_info *ini) 2052 { 2053 int rc; 2054 2055 /* allocate connection / link group */ 2056 rc = smc_conn_create(new_smc, ini); 2057 if (rc) 2058 return rc; 2059 2060 /* create send buffer and rmb */ 2061 if (smc_buf_create(new_smc, false)) { 2062 smc_conn_abort(new_smc, ini->first_contact_local); 2063 return SMC_CLC_DECL_MEM; 2064 } 2065 2066 return 0; 2067 } 2068 2069 /* listen worker: initialize connection and buffers for SMC-D */ 2070 static int smc_listen_ism_init(struct smc_sock *new_smc, 2071 struct smc_init_info *ini) 2072 { 2073 int rc; 2074 2075 rc = smc_conn_create(new_smc, ini); 2076 if (rc) 2077 return rc; 2078 2079 /* Create send and receive buffers */ 2080 rc = smc_buf_create(new_smc, true); 2081 if (rc) { 2082 smc_conn_abort(new_smc, ini->first_contact_local); 2083 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 2084 SMC_CLC_DECL_MEM; 2085 } 2086 2087 return 0; 2088 } 2089 2090 static bool smc_is_already_selected(struct smcd_dev *smcd, 2091 struct smc_init_info *ini, 2092 int matches) 2093 { 2094 int i; 2095 2096 for (i = 0; i < matches; i++) 2097 if (smcd == ini->ism_dev[i]) 2098 return true; 2099 2100 return false; 2101 } 2102 2103 /* check for ISM devices matching proposed ISM devices */ 2104 static void smc_check_ism_v2_match(struct smc_init_info *ini, 2105 u16 proposed_chid, u64 proposed_gid, 2106 unsigned int *matches) 2107 { 2108 struct smcd_dev *smcd; 2109 2110 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2111 if (smcd->going_away) 2112 continue; 2113 if (smc_is_already_selected(smcd, ini, *matches)) 2114 continue; 2115 if (smc_ism_get_chid(smcd) == proposed_chid && 2116 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 2117 ini->ism_peer_gid[*matches] = proposed_gid; 2118 ini->ism_dev[*matches] = smcd; 2119 (*matches)++; 2120 break; 2121 } 2122 } 2123 } 2124 2125 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 2126 { 2127 if (!ini->rc) 2128 ini->rc = rc; 2129 } 2130 2131 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 2132 struct smc_clc_msg_proposal *pclc, 2133 struct smc_init_info *ini) 2134 { 2135 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 2136 struct smc_clc_v2_extension *smc_v2_ext; 2137 struct smc_clc_msg_smcd *pclc_smcd; 2138 unsigned int matches = 0; 2139 u8 smcd_version; 2140 u8 *eid = NULL; 2141 int i, rc; 2142 2143 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 2144 goto not_found; 2145 2146 pclc_smcd = smc_get_clc_msg_smcd(pclc); 2147 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2148 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 2149 2150 mutex_lock(&smcd_dev_list.mutex); 2151 if (pclc_smcd->ism.chid) 2152 /* check for ISM device matching proposed native ISM device */ 2153 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 2154 ntohll(pclc_smcd->ism.gid), &matches); 2155 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 2156 /* check for ISM devices matching proposed non-native ISM 2157 * devices 2158 */ 2159 smc_check_ism_v2_match(ini, 2160 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 2161 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 2162 &matches); 2163 } 2164 mutex_unlock(&smcd_dev_list.mutex); 2165 2166 if (!ini->ism_dev[0]) { 2167 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 2168 goto not_found; 2169 } 2170 2171 smc_ism_get_system_eid(&eid); 2172 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 2173 smcd_v2_ext->system_eid, eid)) 2174 goto not_found; 2175 2176 /* separate - outside the smcd_dev_list.lock */ 2177 smcd_version = ini->smcd_version; 2178 for (i = 0; i < matches; i++) { 2179 ini->smcd_version = SMC_V2; 2180 ini->is_smcd = true; 2181 ini->ism_selected = i; 2182 rc = smc_listen_ism_init(new_smc, ini); 2183 if (rc) { 2184 smc_find_ism_store_rc(rc, ini); 2185 /* try next active ISM device */ 2186 continue; 2187 } 2188 return; /* matching and usable V2 ISM device found */ 2189 } 2190 /* no V2 ISM device could be initialized */ 2191 ini->smcd_version = smcd_version; /* restore original value */ 2192 ini->negotiated_eid[0] = 0; 2193 2194 not_found: 2195 ini->smcd_version &= ~SMC_V2; 2196 ini->ism_dev[0] = NULL; 2197 ini->is_smcd = false; 2198 } 2199 2200 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 2201 struct smc_clc_msg_proposal *pclc, 2202 struct smc_init_info *ini) 2203 { 2204 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 2205 int rc = 0; 2206 2207 /* check if ISM V1 is available */ 2208 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 2209 goto not_found; 2210 ini->is_smcd = true; /* prepare ISM check */ 2211 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 2212 rc = smc_find_ism_device(new_smc, ini); 2213 if (rc) 2214 goto not_found; 2215 ini->ism_selected = 0; 2216 rc = smc_listen_ism_init(new_smc, ini); 2217 if (!rc) 2218 return; /* V1 ISM device found */ 2219 2220 not_found: 2221 smc_find_ism_store_rc(rc, ini); 2222 ini->smcd_version &= ~SMC_V1; 2223 ini->ism_dev[0] = NULL; 2224 ini->is_smcd = false; 2225 } 2226 2227 /* listen worker: register buffers */ 2228 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 2229 { 2230 struct smc_connection *conn = &new_smc->conn; 2231 2232 if (!local_first) { 2233 /* reg sendbufs if they were vzalloced */ 2234 if (conn->sndbuf_desc->is_vm) { 2235 if (smcr_lgr_reg_sndbufs(conn->lnk, 2236 conn->sndbuf_desc)) 2237 return SMC_CLC_DECL_ERR_REGBUF; 2238 } 2239 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 2240 return SMC_CLC_DECL_ERR_REGBUF; 2241 } 2242 2243 return 0; 2244 } 2245 2246 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 2247 struct smc_clc_msg_proposal *pclc, 2248 struct smc_init_info *ini) 2249 { 2250 struct smc_clc_v2_extension *smc_v2_ext; 2251 u8 smcr_version; 2252 int rc; 2253 2254 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 2255 goto not_found; 2256 2257 smc_v2_ext = smc_get_clc_v2_ext(pclc); 2258 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 2259 goto not_found; 2260 2261 /* prepare RDMA check */ 2262 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2263 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 2264 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2265 ini->check_smcrv2 = true; 2266 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 2267 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 2268 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 2269 rc = smc_find_rdma_device(new_smc, ini); 2270 if (rc) { 2271 smc_find_ism_store_rc(rc, ini); 2272 goto not_found; 2273 } 2274 if (!ini->smcrv2.uses_gateway) 2275 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 2276 2277 smcr_version = ini->smcr_version; 2278 ini->smcr_version = SMC_V2; 2279 rc = smc_listen_rdma_init(new_smc, ini); 2280 if (!rc) { 2281 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2282 if (rc) 2283 smc_conn_abort(new_smc, ini->first_contact_local); 2284 } 2285 if (!rc) 2286 return; 2287 ini->smcr_version = smcr_version; 2288 smc_find_ism_store_rc(rc, ini); 2289 2290 not_found: 2291 ini->smcr_version &= ~SMC_V2; 2292 ini->smcrv2.ib_dev_v2 = NULL; 2293 ini->check_smcrv2 = false; 2294 } 2295 2296 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 2297 struct smc_clc_msg_proposal *pclc, 2298 struct smc_init_info *ini) 2299 { 2300 int rc; 2301 2302 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 2303 return SMC_CLC_DECL_NOSMCDEV; 2304 2305 /* prepare RDMA check */ 2306 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 2307 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 2308 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 2309 rc = smc_find_rdma_device(new_smc, ini); 2310 if (rc) { 2311 /* no RDMA device found */ 2312 return SMC_CLC_DECL_NOSMCDEV; 2313 } 2314 rc = smc_listen_rdma_init(new_smc, ini); 2315 if (rc) 2316 return rc; 2317 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 2318 } 2319 2320 /* determine the local device matching to proposal */ 2321 static int smc_listen_find_device(struct smc_sock *new_smc, 2322 struct smc_clc_msg_proposal *pclc, 2323 struct smc_init_info *ini) 2324 { 2325 int prfx_rc; 2326 2327 /* check for ISM device matching V2 proposed device */ 2328 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 2329 if (ini->ism_dev[0]) 2330 return 0; 2331 2332 /* check for matching IP prefix and subnet length (V1) */ 2333 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 2334 if (prfx_rc) 2335 smc_find_ism_store_rc(prfx_rc, ini); 2336 2337 /* get vlan id from IP device */ 2338 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 2339 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 2340 2341 /* check for ISM device matching V1 proposed device */ 2342 if (!prfx_rc) 2343 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 2344 if (ini->ism_dev[0]) 2345 return 0; 2346 2347 if (!smcr_indicated(pclc->hdr.typev1) && 2348 !smcr_indicated(pclc->hdr.typev2)) 2349 /* skip RDMA and decline */ 2350 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 2351 2352 /* check if RDMA V2 is available */ 2353 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 2354 if (ini->smcrv2.ib_dev_v2) 2355 return 0; 2356 2357 /* check if RDMA V1 is available */ 2358 if (!prfx_rc) { 2359 int rc; 2360 2361 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 2362 smc_find_ism_store_rc(rc, ini); 2363 return (!rc) ? 0 : ini->rc; 2364 } 2365 return SMC_CLC_DECL_NOSMCDEV; 2366 } 2367 2368 /* listen worker: finish RDMA setup */ 2369 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 2370 struct smc_clc_msg_accept_confirm *cclc, 2371 bool local_first, 2372 struct smc_init_info *ini) 2373 { 2374 struct smc_link *link = new_smc->conn.lnk; 2375 int reason_code = 0; 2376 2377 if (local_first) 2378 smc_link_save_peer_info(link, cclc, ini); 2379 2380 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 2381 return SMC_CLC_DECL_ERR_RTOK; 2382 2383 if (local_first) { 2384 if (smc_ib_ready_link(link)) 2385 return SMC_CLC_DECL_ERR_RDYLNK; 2386 /* QP confirmation over RoCE fabric */ 2387 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 2388 reason_code = smcr_serv_conf_first_link(new_smc); 2389 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 2390 } 2391 return reason_code; 2392 } 2393 2394 /* setup for connection of server */ 2395 static void smc_listen_work(struct work_struct *work) 2396 { 2397 struct smc_sock *new_smc = container_of(work, struct smc_sock, 2398 smc_listen_work); 2399 struct socket *newclcsock = new_smc->clcsock; 2400 struct smc_clc_msg_accept_confirm *cclc; 2401 struct smc_clc_msg_proposal_area *buf; 2402 struct smc_clc_msg_proposal *pclc; 2403 struct smc_init_info *ini = NULL; 2404 u8 proposal_version = SMC_V1; 2405 u8 accept_version; 2406 int rc = 0; 2407 2408 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 2409 return smc_listen_out_err(new_smc); 2410 2411 if (new_smc->use_fallback) { 2412 smc_listen_out_connected(new_smc); 2413 return; 2414 } 2415 2416 /* check if peer is smc capable */ 2417 if (!tcp_sk(newclcsock->sk)->syn_smc) { 2418 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 2419 if (rc) 2420 smc_listen_out_err(new_smc); 2421 else 2422 smc_listen_out_connected(new_smc); 2423 return; 2424 } 2425 2426 /* do inband token exchange - 2427 * wait for and receive SMC Proposal CLC message 2428 */ 2429 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 2430 if (!buf) { 2431 rc = SMC_CLC_DECL_MEM; 2432 goto out_decl; 2433 } 2434 pclc = (struct smc_clc_msg_proposal *)buf; 2435 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2436 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2437 if (rc) 2438 goto out_decl; 2439 2440 if (pclc->hdr.version > SMC_V1) 2441 proposal_version = SMC_V2; 2442 2443 /* IPSec connections opt out of SMC optimizations */ 2444 if (using_ipsec(new_smc)) { 2445 rc = SMC_CLC_DECL_IPSEC; 2446 goto out_decl; 2447 } 2448 2449 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2450 if (!ini) { 2451 rc = SMC_CLC_DECL_MEM; 2452 goto out_decl; 2453 } 2454 2455 /* initial version checking */ 2456 rc = smc_listen_v2_check(new_smc, pclc, ini); 2457 if (rc) 2458 goto out_decl; 2459 2460 rc = smc_clc_srv_v2x_features_validate(pclc, ini); 2461 if (rc) 2462 goto out_decl; 2463 2464 mutex_lock(&smc_server_lgr_pending); 2465 smc_close_init(new_smc); 2466 smc_rx_init(new_smc); 2467 smc_tx_init(new_smc); 2468 2469 /* determine ISM or RoCE device used for connection */ 2470 rc = smc_listen_find_device(new_smc, pclc, ini); 2471 if (rc) 2472 goto out_unlock; 2473 2474 /* send SMC Accept CLC message */ 2475 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2476 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2477 accept_version, ini->negotiated_eid, ini); 2478 if (rc) 2479 goto out_unlock; 2480 2481 /* SMC-D does not need this lock any more */ 2482 if (ini->is_smcd) 2483 mutex_unlock(&smc_server_lgr_pending); 2484 2485 /* receive SMC Confirm CLC message */ 2486 memset(buf, 0, sizeof(*buf)); 2487 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2488 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2489 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2490 if (rc) { 2491 if (!ini->is_smcd) 2492 goto out_unlock; 2493 goto out_decl; 2494 } 2495 2496 rc = smc_clc_v2x_features_confirm_check(cclc, ini); 2497 if (rc) { 2498 if (!ini->is_smcd) 2499 goto out_unlock; 2500 goto out_decl; 2501 } 2502 2503 /* fce smc release version is needed in smc_listen_rdma_finish, 2504 * so save fce info here. 2505 */ 2506 smc_conn_save_peer_info_fce(new_smc, cclc); 2507 2508 /* finish worker */ 2509 if (!ini->is_smcd) { 2510 rc = smc_listen_rdma_finish(new_smc, cclc, 2511 ini->first_contact_local, ini); 2512 if (rc) 2513 goto out_unlock; 2514 mutex_unlock(&smc_server_lgr_pending); 2515 } 2516 smc_conn_save_peer_info(new_smc, cclc); 2517 smc_listen_out_connected(new_smc); 2518 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2519 goto out_free; 2520 2521 out_unlock: 2522 mutex_unlock(&smc_server_lgr_pending); 2523 out_decl: 2524 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2525 proposal_version); 2526 out_free: 2527 kfree(ini); 2528 kfree(buf); 2529 } 2530 2531 static void smc_tcp_listen_work(struct work_struct *work) 2532 { 2533 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2534 tcp_listen_work); 2535 struct sock *lsk = &lsmc->sk; 2536 struct smc_sock *new_smc; 2537 int rc = 0; 2538 2539 lock_sock(lsk); 2540 while (lsk->sk_state == SMC_LISTEN) { 2541 rc = smc_clcsock_accept(lsmc, &new_smc); 2542 if (rc) /* clcsock accept queue empty or error */ 2543 goto out; 2544 if (!new_smc) 2545 continue; 2546 2547 if (tcp_sk(new_smc->clcsock->sk)->syn_smc) 2548 atomic_inc(&lsmc->queued_smc_hs); 2549 2550 new_smc->listen_smc = lsmc; 2551 new_smc->use_fallback = lsmc->use_fallback; 2552 new_smc->fallback_rsn = lsmc->fallback_rsn; 2553 sock_hold(lsk); /* sock_put in smc_listen_work */ 2554 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2555 smc_copy_sock_settings_to_smc(new_smc); 2556 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2557 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2558 sock_put(&new_smc->sk); 2559 } 2560 2561 out: 2562 release_sock(lsk); 2563 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2564 } 2565 2566 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2567 { 2568 struct smc_sock *lsmc; 2569 2570 read_lock_bh(&listen_clcsock->sk_callback_lock); 2571 lsmc = smc_clcsock_user_data(listen_clcsock); 2572 if (!lsmc) 2573 goto out; 2574 lsmc->clcsk_data_ready(listen_clcsock); 2575 if (lsmc->sk.sk_state == SMC_LISTEN) { 2576 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2577 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work)) 2578 sock_put(&lsmc->sk); 2579 } 2580 out: 2581 read_unlock_bh(&listen_clcsock->sk_callback_lock); 2582 } 2583 2584 static int smc_listen(struct socket *sock, int backlog) 2585 { 2586 struct sock *sk = sock->sk; 2587 struct smc_sock *smc; 2588 int rc; 2589 2590 smc = smc_sk(sk); 2591 lock_sock(sk); 2592 2593 rc = -EINVAL; 2594 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2595 smc->connect_nonblock || sock->state != SS_UNCONNECTED) 2596 goto out; 2597 2598 rc = 0; 2599 if (sk->sk_state == SMC_LISTEN) { 2600 sk->sk_max_ack_backlog = backlog; 2601 goto out; 2602 } 2603 /* some socket options are handled in core, so we could not apply 2604 * them to the clc socket -- copy smc socket options to clc socket 2605 */ 2606 smc_copy_sock_settings_to_clc(smc); 2607 if (!smc->use_fallback) 2608 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2609 2610 /* save original sk_data_ready function and establish 2611 * smc-specific sk_data_ready function 2612 */ 2613 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2614 smc->clcsock->sk->sk_user_data = 2615 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2616 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready, 2617 smc_clcsock_data_ready, &smc->clcsk_data_ready); 2618 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2619 2620 /* save original ops */ 2621 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops; 2622 2623 smc->af_ops = *smc->ori_af_ops; 2624 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock; 2625 2626 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; 2627 2628 if (smc->limit_smc_hs) 2629 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; 2630 2631 rc = kernel_listen(smc->clcsock, backlog); 2632 if (rc) { 2633 write_lock_bh(&smc->clcsock->sk->sk_callback_lock); 2634 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready, 2635 &smc->clcsk_data_ready); 2636 smc->clcsock->sk->sk_user_data = NULL; 2637 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock); 2638 goto out; 2639 } 2640 sk->sk_max_ack_backlog = backlog; 2641 sk->sk_ack_backlog = 0; 2642 sk->sk_state = SMC_LISTEN; 2643 2644 out: 2645 release_sock(sk); 2646 return rc; 2647 } 2648 2649 static int smc_accept(struct socket *sock, struct socket *new_sock, 2650 int flags, bool kern) 2651 { 2652 struct sock *sk = sock->sk, *nsk; 2653 DECLARE_WAITQUEUE(wait, current); 2654 struct smc_sock *lsmc; 2655 long timeo; 2656 int rc = 0; 2657 2658 lsmc = smc_sk(sk); 2659 sock_hold(sk); /* sock_put below */ 2660 lock_sock(sk); 2661 2662 if (lsmc->sk.sk_state != SMC_LISTEN) { 2663 rc = -EINVAL; 2664 release_sock(sk); 2665 goto out; 2666 } 2667 2668 /* Wait for an incoming connection */ 2669 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2670 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2671 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2672 set_current_state(TASK_INTERRUPTIBLE); 2673 if (!timeo) { 2674 rc = -EAGAIN; 2675 break; 2676 } 2677 release_sock(sk); 2678 timeo = schedule_timeout(timeo); 2679 /* wakeup by sk_data_ready in smc_listen_work() */ 2680 sched_annotate_sleep(); 2681 lock_sock(sk); 2682 if (signal_pending(current)) { 2683 rc = sock_intr_errno(timeo); 2684 break; 2685 } 2686 } 2687 set_current_state(TASK_RUNNING); 2688 remove_wait_queue(sk_sleep(sk), &wait); 2689 2690 if (!rc) 2691 rc = sock_error(nsk); 2692 release_sock(sk); 2693 if (rc) 2694 goto out; 2695 2696 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 2697 /* wait till data arrives on the socket */ 2698 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 2699 MSEC_PER_SEC); 2700 if (smc_sk(nsk)->use_fallback) { 2701 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2702 2703 lock_sock(clcsk); 2704 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2705 sk_wait_data(clcsk, &timeo, NULL); 2706 release_sock(clcsk); 2707 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2708 lock_sock(nsk); 2709 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 2710 release_sock(nsk); 2711 } 2712 } 2713 2714 out: 2715 sock_put(sk); /* sock_hold above */ 2716 return rc; 2717 } 2718 2719 static int smc_getname(struct socket *sock, struct sockaddr *addr, 2720 int peer) 2721 { 2722 struct smc_sock *smc; 2723 2724 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2725 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2726 return -ENOTCONN; 2727 2728 smc = smc_sk(sock->sk); 2729 2730 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2731 } 2732 2733 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2734 { 2735 struct sock *sk = sock->sk; 2736 struct smc_sock *smc; 2737 int rc; 2738 2739 smc = smc_sk(sk); 2740 lock_sock(sk); 2741 2742 /* SMC does not support connect with fastopen */ 2743 if (msg->msg_flags & MSG_FASTOPEN) { 2744 /* not connected yet, fallback */ 2745 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2746 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2747 if (rc) 2748 goto out; 2749 } else { 2750 rc = -EINVAL; 2751 goto out; 2752 } 2753 } else if ((sk->sk_state != SMC_ACTIVE) && 2754 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2755 (sk->sk_state != SMC_INIT)) { 2756 rc = -EPIPE; 2757 goto out; 2758 } 2759 2760 if (smc->use_fallback) { 2761 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2762 } else { 2763 rc = smc_tx_sendmsg(smc, msg, len); 2764 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2765 } 2766 out: 2767 release_sock(sk); 2768 return rc; 2769 } 2770 2771 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2772 int flags) 2773 { 2774 struct sock *sk = sock->sk; 2775 struct smc_sock *smc; 2776 int rc = -ENOTCONN; 2777 2778 smc = smc_sk(sk); 2779 lock_sock(sk); 2780 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2781 /* socket was connected before, no more data to read */ 2782 rc = 0; 2783 goto out; 2784 } 2785 if ((sk->sk_state == SMC_INIT) || 2786 (sk->sk_state == SMC_LISTEN) || 2787 (sk->sk_state == SMC_CLOSED)) 2788 goto out; 2789 2790 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2791 rc = 0; 2792 goto out; 2793 } 2794 2795 if (smc->use_fallback) { 2796 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2797 } else { 2798 msg->msg_namelen = 0; 2799 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2800 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2801 } 2802 2803 out: 2804 release_sock(sk); 2805 return rc; 2806 } 2807 2808 static __poll_t smc_accept_poll(struct sock *parent) 2809 { 2810 struct smc_sock *isk = smc_sk(parent); 2811 __poll_t mask = 0; 2812 2813 spin_lock(&isk->accept_q_lock); 2814 if (!list_empty(&isk->accept_q)) 2815 mask = EPOLLIN | EPOLLRDNORM; 2816 spin_unlock(&isk->accept_q_lock); 2817 2818 return mask; 2819 } 2820 2821 static __poll_t smc_poll(struct file *file, struct socket *sock, 2822 poll_table *wait) 2823 { 2824 struct sock *sk = sock->sk; 2825 struct smc_sock *smc; 2826 __poll_t mask = 0; 2827 2828 if (!sk) 2829 return EPOLLNVAL; 2830 2831 smc = smc_sk(sock->sk); 2832 if (smc->use_fallback) { 2833 /* delegate to CLC child sock */ 2834 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2835 sk->sk_err = smc->clcsock->sk->sk_err; 2836 } else { 2837 if (sk->sk_state != SMC_CLOSED) 2838 sock_poll_wait(file, sock, wait); 2839 if (sk->sk_err) 2840 mask |= EPOLLERR; 2841 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2842 (sk->sk_state == SMC_CLOSED)) 2843 mask |= EPOLLHUP; 2844 if (sk->sk_state == SMC_LISTEN) { 2845 /* woken up by sk_data_ready in smc_listen_work() */ 2846 mask |= smc_accept_poll(sk); 2847 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2848 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2849 wait); 2850 sk->sk_err = smc->clcsock->sk->sk_err; 2851 } else { 2852 if ((sk->sk_state != SMC_INIT && 2853 atomic_read(&smc->conn.sndbuf_space)) || 2854 sk->sk_shutdown & SEND_SHUTDOWN) { 2855 mask |= EPOLLOUT | EPOLLWRNORM; 2856 } else { 2857 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2858 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2859 } 2860 if (atomic_read(&smc->conn.bytes_to_rcv)) 2861 mask |= EPOLLIN | EPOLLRDNORM; 2862 if (sk->sk_shutdown & RCV_SHUTDOWN) 2863 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2864 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2865 mask |= EPOLLIN; 2866 if (smc->conn.urg_state == SMC_URG_VALID) 2867 mask |= EPOLLPRI; 2868 } 2869 } 2870 2871 return mask; 2872 } 2873 2874 static int smc_shutdown(struct socket *sock, int how) 2875 { 2876 struct sock *sk = sock->sk; 2877 bool do_shutdown = true; 2878 struct smc_sock *smc; 2879 int rc = -EINVAL; 2880 int old_state; 2881 int rc1 = 0; 2882 2883 smc = smc_sk(sk); 2884 2885 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2886 return rc; 2887 2888 lock_sock(sk); 2889 2890 if (sock->state == SS_CONNECTING) { 2891 if (sk->sk_state == SMC_ACTIVE) 2892 sock->state = SS_CONNECTED; 2893 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 || 2894 sk->sk_state == SMC_PEERCLOSEWAIT2 || 2895 sk->sk_state == SMC_APPCLOSEWAIT1 || 2896 sk->sk_state == SMC_APPCLOSEWAIT2 || 2897 sk->sk_state == SMC_APPFINCLOSEWAIT) 2898 sock->state = SS_DISCONNECTING; 2899 } 2900 2901 rc = -ENOTCONN; 2902 if ((sk->sk_state != SMC_ACTIVE) && 2903 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2904 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2905 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2906 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2907 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2908 goto out; 2909 if (smc->use_fallback) { 2910 rc = kernel_sock_shutdown(smc->clcsock, how); 2911 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2912 if (sk->sk_shutdown == SHUTDOWN_MASK) { 2913 sk->sk_state = SMC_CLOSED; 2914 sk->sk_socket->state = SS_UNCONNECTED; 2915 sock_put(sk); 2916 } 2917 goto out; 2918 } 2919 switch (how) { 2920 case SHUT_RDWR: /* shutdown in both directions */ 2921 old_state = sk->sk_state; 2922 rc = smc_close_active(smc); 2923 if (old_state == SMC_ACTIVE && 2924 sk->sk_state == SMC_PEERCLOSEWAIT1) 2925 do_shutdown = false; 2926 break; 2927 case SHUT_WR: 2928 rc = smc_close_shutdown_write(smc); 2929 break; 2930 case SHUT_RD: 2931 rc = 0; 2932 /* nothing more to do because peer is not involved */ 2933 break; 2934 } 2935 if (do_shutdown && smc->clcsock) 2936 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2937 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2938 sk->sk_shutdown |= how + 1; 2939 2940 if (sk->sk_state == SMC_CLOSED) 2941 sock->state = SS_UNCONNECTED; 2942 else 2943 sock->state = SS_DISCONNECTING; 2944 out: 2945 release_sock(sk); 2946 return rc ? rc : rc1; 2947 } 2948 2949 static int __smc_getsockopt(struct socket *sock, int level, int optname, 2950 char __user *optval, int __user *optlen) 2951 { 2952 struct smc_sock *smc; 2953 int val, len; 2954 2955 smc = smc_sk(sock->sk); 2956 2957 if (get_user(len, optlen)) 2958 return -EFAULT; 2959 2960 len = min_t(int, len, sizeof(int)); 2961 2962 if (len < 0) 2963 return -EINVAL; 2964 2965 switch (optname) { 2966 case SMC_LIMIT_HS: 2967 val = smc->limit_smc_hs; 2968 break; 2969 default: 2970 return -EOPNOTSUPP; 2971 } 2972 2973 if (put_user(len, optlen)) 2974 return -EFAULT; 2975 if (copy_to_user(optval, &val, len)) 2976 return -EFAULT; 2977 2978 return 0; 2979 } 2980 2981 static int __smc_setsockopt(struct socket *sock, int level, int optname, 2982 sockptr_t optval, unsigned int optlen) 2983 { 2984 struct sock *sk = sock->sk; 2985 struct smc_sock *smc; 2986 int val, rc; 2987 2988 smc = smc_sk(sk); 2989 2990 lock_sock(sk); 2991 switch (optname) { 2992 case SMC_LIMIT_HS: 2993 if (optlen < sizeof(int)) { 2994 rc = -EINVAL; 2995 break; 2996 } 2997 if (copy_from_sockptr(&val, optval, sizeof(int))) { 2998 rc = -EFAULT; 2999 break; 3000 } 3001 3002 smc->limit_smc_hs = !!val; 3003 rc = 0; 3004 break; 3005 default: 3006 rc = -EOPNOTSUPP; 3007 break; 3008 } 3009 release_sock(sk); 3010 3011 return rc; 3012 } 3013 3014 static int smc_setsockopt(struct socket *sock, int level, int optname, 3015 sockptr_t optval, unsigned int optlen) 3016 { 3017 struct sock *sk = sock->sk; 3018 struct smc_sock *smc; 3019 int val, rc; 3020 3021 if (level == SOL_TCP && optname == TCP_ULP) 3022 return -EOPNOTSUPP; 3023 else if (level == SOL_SMC) 3024 return __smc_setsockopt(sock, level, optname, optval, optlen); 3025 3026 smc = smc_sk(sk); 3027 3028 /* generic setsockopts reaching us here always apply to the 3029 * CLC socket 3030 */ 3031 mutex_lock(&smc->clcsock_release_lock); 3032 if (!smc->clcsock) { 3033 mutex_unlock(&smc->clcsock_release_lock); 3034 return -EBADF; 3035 } 3036 if (unlikely(!smc->clcsock->ops->setsockopt)) 3037 rc = -EOPNOTSUPP; 3038 else 3039 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 3040 optval, optlen); 3041 if (smc->clcsock->sk->sk_err) { 3042 sk->sk_err = smc->clcsock->sk->sk_err; 3043 sk_error_report(sk); 3044 } 3045 mutex_unlock(&smc->clcsock_release_lock); 3046 3047 if (optlen < sizeof(int)) 3048 return -EINVAL; 3049 if (copy_from_sockptr(&val, optval, sizeof(int))) 3050 return -EFAULT; 3051 3052 lock_sock(sk); 3053 if (rc || smc->use_fallback) 3054 goto out; 3055 switch (optname) { 3056 case TCP_FASTOPEN: 3057 case TCP_FASTOPEN_CONNECT: 3058 case TCP_FASTOPEN_KEY: 3059 case TCP_FASTOPEN_NO_COOKIE: 3060 /* option not supported by SMC */ 3061 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 3062 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 3063 } else { 3064 rc = -EINVAL; 3065 } 3066 break; 3067 case TCP_NODELAY: 3068 if (sk->sk_state != SMC_INIT && 3069 sk->sk_state != SMC_LISTEN && 3070 sk->sk_state != SMC_CLOSED) { 3071 if (val) { 3072 SMC_STAT_INC(smc, ndly_cnt); 3073 smc_tx_pending(&smc->conn); 3074 cancel_delayed_work(&smc->conn.tx_work); 3075 } 3076 } 3077 break; 3078 case TCP_CORK: 3079 if (sk->sk_state != SMC_INIT && 3080 sk->sk_state != SMC_LISTEN && 3081 sk->sk_state != SMC_CLOSED) { 3082 if (!val) { 3083 SMC_STAT_INC(smc, cork_cnt); 3084 smc_tx_pending(&smc->conn); 3085 cancel_delayed_work(&smc->conn.tx_work); 3086 } 3087 } 3088 break; 3089 case TCP_DEFER_ACCEPT: 3090 smc->sockopt_defer_accept = val; 3091 break; 3092 default: 3093 break; 3094 } 3095 out: 3096 release_sock(sk); 3097 3098 return rc; 3099 } 3100 3101 static int smc_getsockopt(struct socket *sock, int level, int optname, 3102 char __user *optval, int __user *optlen) 3103 { 3104 struct smc_sock *smc; 3105 int rc; 3106 3107 if (level == SOL_SMC) 3108 return __smc_getsockopt(sock, level, optname, optval, optlen); 3109 3110 smc = smc_sk(sock->sk); 3111 mutex_lock(&smc->clcsock_release_lock); 3112 if (!smc->clcsock) { 3113 mutex_unlock(&smc->clcsock_release_lock); 3114 return -EBADF; 3115 } 3116 /* socket options apply to the CLC socket */ 3117 if (unlikely(!smc->clcsock->ops->getsockopt)) { 3118 mutex_unlock(&smc->clcsock_release_lock); 3119 return -EOPNOTSUPP; 3120 } 3121 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 3122 optval, optlen); 3123 mutex_unlock(&smc->clcsock_release_lock); 3124 return rc; 3125 } 3126 3127 static int smc_ioctl(struct socket *sock, unsigned int cmd, 3128 unsigned long arg) 3129 { 3130 union smc_host_cursor cons, urg; 3131 struct smc_connection *conn; 3132 struct smc_sock *smc; 3133 int answ; 3134 3135 smc = smc_sk(sock->sk); 3136 conn = &smc->conn; 3137 lock_sock(&smc->sk); 3138 if (smc->use_fallback) { 3139 if (!smc->clcsock) { 3140 release_sock(&smc->sk); 3141 return -EBADF; 3142 } 3143 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 3144 release_sock(&smc->sk); 3145 return answ; 3146 } 3147 switch (cmd) { 3148 case SIOCINQ: /* same as FIONREAD */ 3149 if (smc->sk.sk_state == SMC_LISTEN) { 3150 release_sock(&smc->sk); 3151 return -EINVAL; 3152 } 3153 if (smc->sk.sk_state == SMC_INIT || 3154 smc->sk.sk_state == SMC_CLOSED) 3155 answ = 0; 3156 else 3157 answ = atomic_read(&smc->conn.bytes_to_rcv); 3158 break; 3159 case SIOCOUTQ: 3160 /* output queue size (not send + not acked) */ 3161 if (smc->sk.sk_state == SMC_LISTEN) { 3162 release_sock(&smc->sk); 3163 return -EINVAL; 3164 } 3165 if (smc->sk.sk_state == SMC_INIT || 3166 smc->sk.sk_state == SMC_CLOSED) 3167 answ = 0; 3168 else 3169 answ = smc->conn.sndbuf_desc->len - 3170 atomic_read(&smc->conn.sndbuf_space); 3171 break; 3172 case SIOCOUTQNSD: 3173 /* output queue size (not send only) */ 3174 if (smc->sk.sk_state == SMC_LISTEN) { 3175 release_sock(&smc->sk); 3176 return -EINVAL; 3177 } 3178 if (smc->sk.sk_state == SMC_INIT || 3179 smc->sk.sk_state == SMC_CLOSED) 3180 answ = 0; 3181 else 3182 answ = smc_tx_prepared_sends(&smc->conn); 3183 break; 3184 case SIOCATMARK: 3185 if (smc->sk.sk_state == SMC_LISTEN) { 3186 release_sock(&smc->sk); 3187 return -EINVAL; 3188 } 3189 if (smc->sk.sk_state == SMC_INIT || 3190 smc->sk.sk_state == SMC_CLOSED) { 3191 answ = 0; 3192 } else { 3193 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 3194 smc_curs_copy(&urg, &conn->urg_curs, conn); 3195 answ = smc_curs_diff(conn->rmb_desc->len, 3196 &cons, &urg) == 1; 3197 } 3198 break; 3199 default: 3200 release_sock(&smc->sk); 3201 return -ENOIOCTLCMD; 3202 } 3203 release_sock(&smc->sk); 3204 3205 return put_user(answ, (int __user *)arg); 3206 } 3207 3208 /* Map the affected portions of the rmbe into an spd, note the number of bytes 3209 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 3210 * updates till whenever a respective page has been fully processed. 3211 * Note that subsequent recv() calls have to wait till all splice() processing 3212 * completed. 3213 */ 3214 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 3215 struct pipe_inode_info *pipe, size_t len, 3216 unsigned int flags) 3217 { 3218 struct sock *sk = sock->sk; 3219 struct smc_sock *smc; 3220 int rc = -ENOTCONN; 3221 3222 smc = smc_sk(sk); 3223 lock_sock(sk); 3224 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 3225 /* socket was connected before, no more data to read */ 3226 rc = 0; 3227 goto out; 3228 } 3229 if (sk->sk_state == SMC_INIT || 3230 sk->sk_state == SMC_LISTEN || 3231 sk->sk_state == SMC_CLOSED) 3232 goto out; 3233 3234 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 3235 rc = 0; 3236 goto out; 3237 } 3238 3239 if (smc->use_fallback) { 3240 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 3241 pipe, len, flags); 3242 } else { 3243 if (*ppos) { 3244 rc = -ESPIPE; 3245 goto out; 3246 } 3247 if (flags & SPLICE_F_NONBLOCK) 3248 flags = MSG_DONTWAIT; 3249 else 3250 flags = 0; 3251 SMC_STAT_INC(smc, splice_cnt); 3252 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 3253 } 3254 out: 3255 release_sock(sk); 3256 3257 return rc; 3258 } 3259 3260 /* must look like tcp */ 3261 static const struct proto_ops smc_sock_ops = { 3262 .family = PF_SMC, 3263 .owner = THIS_MODULE, 3264 .release = smc_release, 3265 .bind = smc_bind, 3266 .connect = smc_connect, 3267 .socketpair = sock_no_socketpair, 3268 .accept = smc_accept, 3269 .getname = smc_getname, 3270 .poll = smc_poll, 3271 .ioctl = smc_ioctl, 3272 .listen = smc_listen, 3273 .shutdown = smc_shutdown, 3274 .setsockopt = smc_setsockopt, 3275 .getsockopt = smc_getsockopt, 3276 .sendmsg = smc_sendmsg, 3277 .recvmsg = smc_recvmsg, 3278 .mmap = sock_no_mmap, 3279 .splice_read = smc_splice_read, 3280 }; 3281 3282 static int __smc_create(struct net *net, struct socket *sock, int protocol, 3283 int kern, struct socket *clcsock) 3284 { 3285 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 3286 struct smc_sock *smc; 3287 struct sock *sk; 3288 int rc; 3289 3290 rc = -ESOCKTNOSUPPORT; 3291 if (sock->type != SOCK_STREAM) 3292 goto out; 3293 3294 rc = -EPROTONOSUPPORT; 3295 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 3296 goto out; 3297 3298 rc = -ENOBUFS; 3299 sock->ops = &smc_sock_ops; 3300 sock->state = SS_UNCONNECTED; 3301 sk = smc_sock_alloc(net, sock, protocol); 3302 if (!sk) 3303 goto out; 3304 3305 /* create internal TCP socket for CLC handshake and fallback */ 3306 smc = smc_sk(sk); 3307 smc->use_fallback = false; /* assume rdma capability first */ 3308 smc->fallback_rsn = 0; 3309 3310 /* default behavior from limit_smc_hs in every net namespace */ 3311 smc->limit_smc_hs = net->smc.limit_smc_hs; 3312 3313 rc = 0; 3314 if (!clcsock) { 3315 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 3316 &smc->clcsock); 3317 if (rc) { 3318 sk_common_release(sk); 3319 goto out; 3320 } 3321 3322 /* smc_clcsock_release() does not wait smc->clcsock->sk's 3323 * destruction; its sk_state might not be TCP_CLOSE after 3324 * smc->sk is close()d, and TCP timers can be fired later, 3325 * which need net ref. 3326 */ 3327 sk = smc->clcsock->sk; 3328 __netns_tracker_free(net, &sk->ns_tracker, false); 3329 sk->sk_net_refcnt = 1; 3330 get_net_track(net, &sk->ns_tracker, GFP_KERNEL); 3331 sock_inuse_add(net, 1); 3332 } else { 3333 smc->clcsock = clcsock; 3334 } 3335 3336 out: 3337 return rc; 3338 } 3339 3340 static int smc_create(struct net *net, struct socket *sock, int protocol, 3341 int kern) 3342 { 3343 return __smc_create(net, sock, protocol, kern, NULL); 3344 } 3345 3346 static const struct net_proto_family smc_sock_family_ops = { 3347 .family = PF_SMC, 3348 .owner = THIS_MODULE, 3349 .create = smc_create, 3350 }; 3351 3352 static int smc_ulp_init(struct sock *sk) 3353 { 3354 struct socket *tcp = sk->sk_socket; 3355 struct net *net = sock_net(sk); 3356 struct socket *smcsock; 3357 int protocol, ret; 3358 3359 /* only TCP can be replaced */ 3360 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 3361 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 3362 return -ESOCKTNOSUPPORT; 3363 /* don't handle wq now */ 3364 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 3365 return -ENOTCONN; 3366 3367 if (sk->sk_family == AF_INET) 3368 protocol = SMCPROTO_SMC; 3369 else 3370 protocol = SMCPROTO_SMC6; 3371 3372 smcsock = sock_alloc(); 3373 if (!smcsock) 3374 return -ENFILE; 3375 3376 smcsock->type = SOCK_STREAM; 3377 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 3378 ret = __smc_create(net, smcsock, protocol, 1, tcp); 3379 if (ret) { 3380 sock_release(smcsock); /* module_put() which ops won't be NULL */ 3381 return ret; 3382 } 3383 3384 /* replace tcp socket to smc */ 3385 smcsock->file = tcp->file; 3386 smcsock->file->private_data = smcsock; 3387 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 3388 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 3389 tcp->file = NULL; 3390 3391 return ret; 3392 } 3393 3394 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 3395 const gfp_t priority) 3396 { 3397 struct inet_connection_sock *icsk = inet_csk(newsk); 3398 3399 /* don't inherit ulp ops to child when listen */ 3400 icsk->icsk_ulp_ops = NULL; 3401 } 3402 3403 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 3404 .name = "smc", 3405 .owner = THIS_MODULE, 3406 .init = smc_ulp_init, 3407 .clone = smc_ulp_clone, 3408 }; 3409 3410 unsigned int smc_net_id; 3411 3412 static __net_init int smc_net_init(struct net *net) 3413 { 3414 int rc; 3415 3416 rc = smc_sysctl_net_init(net); 3417 if (rc) 3418 return rc; 3419 return smc_pnet_net_init(net); 3420 } 3421 3422 static void __net_exit smc_net_exit(struct net *net) 3423 { 3424 smc_sysctl_net_exit(net); 3425 smc_pnet_net_exit(net); 3426 } 3427 3428 static __net_init int smc_net_stat_init(struct net *net) 3429 { 3430 return smc_stats_init(net); 3431 } 3432 3433 static void __net_exit smc_net_stat_exit(struct net *net) 3434 { 3435 smc_stats_exit(net); 3436 } 3437 3438 static struct pernet_operations smc_net_ops = { 3439 .init = smc_net_init, 3440 .exit = smc_net_exit, 3441 .id = &smc_net_id, 3442 .size = sizeof(struct smc_net), 3443 }; 3444 3445 static struct pernet_operations smc_net_stat_ops = { 3446 .init = smc_net_stat_init, 3447 .exit = smc_net_stat_exit, 3448 }; 3449 3450 static int __init smc_init(void) 3451 { 3452 int rc; 3453 3454 rc = register_pernet_subsys(&smc_net_ops); 3455 if (rc) 3456 return rc; 3457 3458 rc = register_pernet_subsys(&smc_net_stat_ops); 3459 if (rc) 3460 goto out_pernet_subsys; 3461 3462 rc = smc_ism_init(); 3463 if (rc) 3464 goto out_pernet_subsys_stat; 3465 smc_clc_init(); 3466 3467 rc = smc_nl_init(); 3468 if (rc) 3469 goto out_ism; 3470 3471 rc = smc_pnet_init(); 3472 if (rc) 3473 goto out_nl; 3474 3475 rc = -ENOMEM; 3476 3477 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0); 3478 if (!smc_tcp_ls_wq) 3479 goto out_pnet; 3480 3481 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 3482 if (!smc_hs_wq) 3483 goto out_alloc_tcp_ls_wq; 3484 3485 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 3486 if (!smc_close_wq) 3487 goto out_alloc_hs_wq; 3488 3489 rc = smc_core_init(); 3490 if (rc) { 3491 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 3492 goto out_alloc_wqs; 3493 } 3494 3495 rc = smc_llc_init(); 3496 if (rc) { 3497 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 3498 goto out_core; 3499 } 3500 3501 rc = smc_cdc_init(); 3502 if (rc) { 3503 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 3504 goto out_core; 3505 } 3506 3507 rc = proto_register(&smc_proto, 1); 3508 if (rc) { 3509 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 3510 goto out_core; 3511 } 3512 3513 rc = proto_register(&smc_proto6, 1); 3514 if (rc) { 3515 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 3516 goto out_proto; 3517 } 3518 3519 rc = sock_register(&smc_sock_family_ops); 3520 if (rc) { 3521 pr_err("%s: sock_register fails with %d\n", __func__, rc); 3522 goto out_proto6; 3523 } 3524 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 3525 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 3526 3527 rc = smc_ib_register_client(); 3528 if (rc) { 3529 pr_err("%s: ib_register fails with %d\n", __func__, rc); 3530 goto out_sock; 3531 } 3532 3533 rc = tcp_register_ulp(&smc_ulp_ops); 3534 if (rc) { 3535 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 3536 goto out_ib; 3537 } 3538 3539 static_branch_enable(&tcp_have_smc); 3540 return 0; 3541 3542 out_ib: 3543 smc_ib_unregister_client(); 3544 out_sock: 3545 sock_unregister(PF_SMC); 3546 out_proto6: 3547 proto_unregister(&smc_proto6); 3548 out_proto: 3549 proto_unregister(&smc_proto); 3550 out_core: 3551 smc_core_exit(); 3552 out_alloc_wqs: 3553 destroy_workqueue(smc_close_wq); 3554 out_alloc_hs_wq: 3555 destroy_workqueue(smc_hs_wq); 3556 out_alloc_tcp_ls_wq: 3557 destroy_workqueue(smc_tcp_ls_wq); 3558 out_pnet: 3559 smc_pnet_exit(); 3560 out_nl: 3561 smc_nl_exit(); 3562 out_ism: 3563 smc_clc_exit(); 3564 smc_ism_exit(); 3565 out_pernet_subsys_stat: 3566 unregister_pernet_subsys(&smc_net_stat_ops); 3567 out_pernet_subsys: 3568 unregister_pernet_subsys(&smc_net_ops); 3569 3570 return rc; 3571 } 3572 3573 static void __exit smc_exit(void) 3574 { 3575 static_branch_disable(&tcp_have_smc); 3576 tcp_unregister_ulp(&smc_ulp_ops); 3577 sock_unregister(PF_SMC); 3578 smc_core_exit(); 3579 smc_ib_unregister_client(); 3580 smc_ism_exit(); 3581 destroy_workqueue(smc_close_wq); 3582 destroy_workqueue(smc_tcp_ls_wq); 3583 destroy_workqueue(smc_hs_wq); 3584 proto_unregister(&smc_proto6); 3585 proto_unregister(&smc_proto); 3586 smc_pnet_exit(); 3587 smc_nl_exit(); 3588 smc_clc_exit(); 3589 unregister_pernet_subsys(&smc_net_stat_ops); 3590 unregister_pernet_subsys(&smc_net_ops); 3591 rcu_barrier(); 3592 } 3593 3594 module_init(smc_init); 3595 module_exit(smc_exit); 3596 3597 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3598 MODULE_DESCRIPTION("smc socket address family"); 3599 MODULE_LICENSE("GPL"); 3600 MODULE_ALIAS_NETPROTO(PF_SMC); 3601 MODULE_ALIAS_TCP_ULP("smc"); 3602 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME); 3603