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 31 #include <net/sock.h> 32 #include <net/tcp.h> 33 #include <net/smc.h> 34 #include <asm/ioctls.h> 35 36 #include <net/net_namespace.h> 37 #include <net/netns/generic.h> 38 #include "smc_netns.h" 39 40 #include "smc.h" 41 #include "smc_clc.h" 42 #include "smc_llc.h" 43 #include "smc_cdc.h" 44 #include "smc_core.h" 45 #include "smc_ib.h" 46 #include "smc_ism.h" 47 #include "smc_pnet.h" 48 #include "smc_netlink.h" 49 #include "smc_tx.h" 50 #include "smc_rx.h" 51 #include "smc_close.h" 52 #include "smc_stats.h" 53 #include "smc_tracepoint.h" 54 55 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group 56 * creation on server 57 */ 58 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group 59 * creation on client 60 */ 61 62 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ 63 struct workqueue_struct *smc_close_wq; /* wq for close work */ 64 65 static void smc_tcp_listen_work(struct work_struct *); 66 static void smc_connect_work(struct work_struct *); 67 68 static void smc_set_keepalive(struct sock *sk, int val) 69 { 70 struct smc_sock *smc = smc_sk(sk); 71 72 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 73 } 74 75 static struct smc_hashinfo smc_v4_hashinfo = { 76 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 77 }; 78 79 static struct smc_hashinfo smc_v6_hashinfo = { 80 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 81 }; 82 83 int smc_hash_sk(struct sock *sk) 84 { 85 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 86 struct hlist_head *head; 87 88 head = &h->ht; 89 90 write_lock_bh(&h->lock); 91 sk_add_node(sk, head); 92 write_unlock_bh(&h->lock); 93 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 94 95 return 0; 96 } 97 EXPORT_SYMBOL_GPL(smc_hash_sk); 98 99 void smc_unhash_sk(struct sock *sk) 100 { 101 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 102 103 write_lock_bh(&h->lock); 104 if (sk_del_node_init(sk)) 105 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 106 write_unlock_bh(&h->lock); 107 } 108 EXPORT_SYMBOL_GPL(smc_unhash_sk); 109 110 struct proto smc_proto = { 111 .name = "SMC", 112 .owner = THIS_MODULE, 113 .keepalive = smc_set_keepalive, 114 .hash = smc_hash_sk, 115 .unhash = smc_unhash_sk, 116 .obj_size = sizeof(struct smc_sock), 117 .h.smc_hash = &smc_v4_hashinfo, 118 .slab_flags = SLAB_TYPESAFE_BY_RCU, 119 }; 120 EXPORT_SYMBOL_GPL(smc_proto); 121 122 struct proto smc_proto6 = { 123 .name = "SMC6", 124 .owner = THIS_MODULE, 125 .keepalive = smc_set_keepalive, 126 .hash = smc_hash_sk, 127 .unhash = smc_unhash_sk, 128 .obj_size = sizeof(struct smc_sock), 129 .h.smc_hash = &smc_v6_hashinfo, 130 .slab_flags = SLAB_TYPESAFE_BY_RCU, 131 }; 132 EXPORT_SYMBOL_GPL(smc_proto6); 133 134 static void smc_restore_fallback_changes(struct smc_sock *smc) 135 { 136 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ 137 smc->clcsock->file->private_data = smc->sk.sk_socket; 138 smc->clcsock->file = NULL; 139 } 140 } 141 142 static int __smc_release(struct smc_sock *smc) 143 { 144 struct sock *sk = &smc->sk; 145 int rc = 0; 146 147 if (!smc->use_fallback) { 148 rc = smc_close_active(smc); 149 sock_set_flag(sk, SOCK_DEAD); 150 sk->sk_shutdown |= SHUTDOWN_MASK; 151 } else { 152 if (sk->sk_state != SMC_CLOSED) { 153 if (sk->sk_state != SMC_LISTEN && 154 sk->sk_state != SMC_INIT) 155 sock_put(sk); /* passive closing */ 156 if (sk->sk_state == SMC_LISTEN) { 157 /* wake up clcsock accept */ 158 rc = kernel_sock_shutdown(smc->clcsock, 159 SHUT_RDWR); 160 } 161 sk->sk_state = SMC_CLOSED; 162 sk->sk_state_change(sk); 163 } 164 smc_restore_fallback_changes(smc); 165 } 166 167 sk->sk_prot->unhash(sk); 168 169 if (sk->sk_state == SMC_CLOSED) { 170 if (smc->clcsock) { 171 release_sock(sk); 172 smc_clcsock_release(smc); 173 lock_sock(sk); 174 } 175 if (!smc->use_fallback) 176 smc_conn_free(&smc->conn); 177 } 178 179 return rc; 180 } 181 182 static int smc_release(struct socket *sock) 183 { 184 struct sock *sk = sock->sk; 185 struct smc_sock *smc; 186 int rc = 0; 187 188 if (!sk) 189 goto out; 190 191 sock_hold(sk); /* sock_put below */ 192 smc = smc_sk(sk); 193 194 /* cleanup for a dangling non-blocking connect */ 195 if (smc->connect_nonblock && sk->sk_state == SMC_INIT) 196 tcp_abort(smc->clcsock->sk, ECONNABORTED); 197 198 if (cancel_work_sync(&smc->connect_work)) 199 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */ 200 201 if (sk->sk_state == SMC_LISTEN) 202 /* smc_close_non_accepted() is called and acquires 203 * sock lock for child sockets again 204 */ 205 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 206 else 207 lock_sock(sk); 208 209 rc = __smc_release(smc); 210 211 /* detach socket */ 212 sock_orphan(sk); 213 sock->sk = NULL; 214 release_sock(sk); 215 216 sock_put(sk); /* sock_hold above */ 217 sock_put(sk); /* final sock_put */ 218 out: 219 return rc; 220 } 221 222 static void smc_destruct(struct sock *sk) 223 { 224 if (sk->sk_state != SMC_CLOSED) 225 return; 226 if (!sock_flag(sk, SOCK_DEAD)) 227 return; 228 229 sk_refcnt_debug_dec(sk); 230 } 231 232 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 233 int protocol) 234 { 235 struct smc_sock *smc; 236 struct proto *prot; 237 struct sock *sk; 238 239 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 240 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 241 if (!sk) 242 return NULL; 243 244 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 245 sk->sk_state = SMC_INIT; 246 sk->sk_destruct = smc_destruct; 247 sk->sk_protocol = protocol; 248 smc = smc_sk(sk); 249 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 250 INIT_WORK(&smc->connect_work, smc_connect_work); 251 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 252 INIT_LIST_HEAD(&smc->accept_q); 253 spin_lock_init(&smc->accept_q_lock); 254 spin_lock_init(&smc->conn.send_lock); 255 sk->sk_prot->hash(sk); 256 sk_refcnt_debug_inc(sk); 257 mutex_init(&smc->clcsock_release_lock); 258 259 return sk; 260 } 261 262 static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 263 int addr_len) 264 { 265 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 266 struct sock *sk = sock->sk; 267 struct smc_sock *smc; 268 int rc; 269 270 smc = smc_sk(sk); 271 272 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 273 rc = -EINVAL; 274 if (addr_len < sizeof(struct sockaddr_in)) 275 goto out; 276 277 rc = -EAFNOSUPPORT; 278 if (addr->sin_family != AF_INET && 279 addr->sin_family != AF_INET6 && 280 addr->sin_family != AF_UNSPEC) 281 goto out; 282 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 283 if (addr->sin_family == AF_UNSPEC && 284 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 285 goto out; 286 287 lock_sock(sk); 288 289 /* Check if socket is already active */ 290 rc = -EINVAL; 291 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 292 goto out_rel; 293 294 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 295 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 296 297 out_rel: 298 release_sock(sk); 299 out: 300 return rc; 301 } 302 303 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 304 unsigned long mask) 305 { 306 /* options we don't get control via setsockopt for */ 307 nsk->sk_type = osk->sk_type; 308 nsk->sk_sndbuf = osk->sk_sndbuf; 309 nsk->sk_rcvbuf = osk->sk_rcvbuf; 310 nsk->sk_sndtimeo = osk->sk_sndtimeo; 311 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 312 nsk->sk_mark = osk->sk_mark; 313 nsk->sk_priority = osk->sk_priority; 314 nsk->sk_rcvlowat = osk->sk_rcvlowat; 315 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 316 nsk->sk_err = osk->sk_err; 317 318 nsk->sk_flags &= ~mask; 319 nsk->sk_flags |= osk->sk_flags & mask; 320 } 321 322 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 323 (1UL << SOCK_KEEPOPEN) | \ 324 (1UL << SOCK_LINGER) | \ 325 (1UL << SOCK_BROADCAST) | \ 326 (1UL << SOCK_TIMESTAMP) | \ 327 (1UL << SOCK_DBG) | \ 328 (1UL << SOCK_RCVTSTAMP) | \ 329 (1UL << SOCK_RCVTSTAMPNS) | \ 330 (1UL << SOCK_LOCALROUTE) | \ 331 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 332 (1UL << SOCK_RXQ_OVFL) | \ 333 (1UL << SOCK_WIFI_STATUS) | \ 334 (1UL << SOCK_NOFCS) | \ 335 (1UL << SOCK_FILTER_LOCKED) | \ 336 (1UL << SOCK_TSTAMP_NEW)) 337 /* copy only relevant settings and flags of SOL_SOCKET level from smc to 338 * clc socket (since smc is not called for these options from net/core) 339 */ 340 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 341 { 342 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 343 } 344 345 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 346 (1UL << SOCK_KEEPOPEN) | \ 347 (1UL << SOCK_LINGER) | \ 348 (1UL << SOCK_DBG)) 349 /* copy only settings and flags relevant for smc from clc to smc socket */ 350 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 351 { 352 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 353 } 354 355 /* register the new rmb on all links */ 356 static int smcr_lgr_reg_rmbs(struct smc_link *link, 357 struct smc_buf_desc *rmb_desc) 358 { 359 struct smc_link_group *lgr = link->lgr; 360 int i, rc = 0; 361 362 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 363 if (rc) 364 return rc; 365 /* protect against parallel smc_llc_cli_rkey_exchange() and 366 * parallel smcr_link_reg_rmb() 367 */ 368 mutex_lock(&lgr->llc_conf_mutex); 369 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 370 if (!smc_link_active(&lgr->lnk[i])) 371 continue; 372 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc); 373 if (rc) 374 goto out; 375 } 376 377 /* exchange confirm_rkey msg with peer */ 378 rc = smc_llc_do_confirm_rkey(link, rmb_desc); 379 if (rc) { 380 rc = -EFAULT; 381 goto out; 382 } 383 rmb_desc->is_conf_rkey = true; 384 out: 385 mutex_unlock(&lgr->llc_conf_mutex); 386 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 387 return rc; 388 } 389 390 static int smcr_clnt_conf_first_link(struct smc_sock *smc) 391 { 392 struct smc_link *link = smc->conn.lnk; 393 struct smc_llc_qentry *qentry; 394 int rc; 395 396 /* receive CONFIRM LINK request from server over RoCE fabric */ 397 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 398 SMC_LLC_CONFIRM_LINK); 399 if (!qentry) { 400 struct smc_clc_msg_decline dclc; 401 402 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 403 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 404 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 405 } 406 smc_llc_save_peer_uid(qentry); 407 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); 408 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 409 if (rc) 410 return SMC_CLC_DECL_RMBE_EC; 411 412 rc = smc_ib_modify_qp_rts(link); 413 if (rc) 414 return SMC_CLC_DECL_ERR_RDYLNK; 415 416 smc_wr_remember_qp_attr(link); 417 418 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 419 return SMC_CLC_DECL_ERR_REGRMB; 420 421 /* confirm_rkey is implicit on 1st contact */ 422 smc->conn.rmb_desc->is_conf_rkey = true; 423 424 /* send CONFIRM LINK response over RoCE fabric */ 425 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 426 if (rc < 0) 427 return SMC_CLC_DECL_TIMEOUT_CL; 428 429 smc_llc_link_active(link); 430 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 431 432 /* optional 2nd link, receive ADD LINK request from server */ 433 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 434 SMC_LLC_ADD_LINK); 435 if (!qentry) { 436 struct smc_clc_msg_decline dclc; 437 438 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 439 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 440 if (rc == -EAGAIN) 441 rc = 0; /* no DECLINE received, go with one link */ 442 return rc; 443 } 444 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); 445 smc_llc_cli_add_link(link, qentry); 446 return 0; 447 } 448 449 static bool smc_isascii(char *hostname) 450 { 451 int i; 452 453 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) 454 if (!isascii(hostname[i])) 455 return false; 456 return true; 457 } 458 459 static void smc_conn_save_peer_info_fce(struct smc_sock *smc, 460 struct smc_clc_msg_accept_confirm *clc) 461 { 462 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 463 (struct smc_clc_msg_accept_confirm_v2 *)clc; 464 struct smc_clc_first_contact_ext *fce; 465 int clc_v2_len; 466 467 if (clc->hdr.version == SMC_V1 || 468 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 469 return; 470 471 if (smc->conn.lgr->is_smcd) { 472 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid, 473 SMC_MAX_EID_LEN); 474 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 475 d1); 476 } else { 477 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid, 478 SMC_MAX_EID_LEN); 479 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2, 480 r1); 481 } 482 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len); 483 smc->conn.lgr->peer_os = fce->os_type; 484 smc->conn.lgr->peer_smc_release = fce->release; 485 if (smc_isascii(fce->hostname)) 486 memcpy(smc->conn.lgr->peer_hostname, fce->hostname, 487 SMC_MAX_HOSTNAME_LEN); 488 } 489 490 static void smcr_conn_save_peer_info(struct smc_sock *smc, 491 struct smc_clc_msg_accept_confirm *clc) 492 { 493 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); 494 495 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; 496 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); 497 smc->conn.peer_rmbe_size = bufsize; 498 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 499 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 500 } 501 502 static void smcd_conn_save_peer_info(struct smc_sock *smc, 503 struct smc_clc_msg_accept_confirm *clc) 504 { 505 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); 506 507 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; 508 smc->conn.peer_token = clc->d0.token; 509 /* msg header takes up space in the buffer */ 510 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 511 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 512 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 513 } 514 515 static void smc_conn_save_peer_info(struct smc_sock *smc, 516 struct smc_clc_msg_accept_confirm *clc) 517 { 518 if (smc->conn.lgr->is_smcd) 519 smcd_conn_save_peer_info(smc, clc); 520 else 521 smcr_conn_save_peer_info(smc, clc); 522 smc_conn_save_peer_info_fce(smc, clc); 523 } 524 525 static void smc_link_save_peer_info(struct smc_link *link, 526 struct smc_clc_msg_accept_confirm *clc, 527 struct smc_init_info *ini) 528 { 529 link->peer_qpn = ntoh24(clc->r0.qpn); 530 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE); 531 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac)); 532 link->peer_psn = ntoh24(clc->r0.psn); 533 link->peer_mtu = clc->r0.qp_mtu; 534 } 535 536 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc, 537 struct smc_stats_fback *fback_arr) 538 { 539 int cnt; 540 541 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) { 542 if (fback_arr[cnt].fback_code == smc->fallback_rsn) { 543 fback_arr[cnt].count++; 544 break; 545 } 546 if (!fback_arr[cnt].fback_code) { 547 fback_arr[cnt].fback_code = smc->fallback_rsn; 548 fback_arr[cnt].count++; 549 break; 550 } 551 } 552 } 553 554 static void smc_stat_fallback(struct smc_sock *smc) 555 { 556 struct net *net = sock_net(&smc->sk); 557 558 mutex_lock(&net->smc.mutex_fback_rsn); 559 if (smc->listen_smc) { 560 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv); 561 net->smc.fback_rsn->srv_fback_cnt++; 562 } else { 563 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt); 564 net->smc.fback_rsn->clnt_fback_cnt++; 565 } 566 mutex_unlock(&net->smc.mutex_fback_rsn); 567 } 568 569 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code) 570 { 571 wait_queue_head_t *smc_wait = sk_sleep(&smc->sk); 572 wait_queue_head_t *clc_wait; 573 unsigned long flags; 574 575 mutex_lock(&smc->clcsock_release_lock); 576 if (!smc->clcsock) { 577 mutex_unlock(&smc->clcsock_release_lock); 578 return -EBADF; 579 } 580 smc->use_fallback = true; 581 smc->fallback_rsn = reason_code; 582 smc_stat_fallback(smc); 583 trace_smc_switch_to_fallback(smc, reason_code); 584 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 585 smc->clcsock->file = smc->sk.sk_socket->file; 586 smc->clcsock->file->private_data = smc->clcsock; 587 smc->clcsock->wq.fasync_list = 588 smc->sk.sk_socket->wq.fasync_list; 589 590 /* There may be some entries remaining in 591 * smc socket->wq, which should be removed 592 * to clcsocket->wq during the fallback. 593 */ 594 clc_wait = sk_sleep(smc->clcsock->sk); 595 spin_lock_irqsave(&smc_wait->lock, flags); 596 spin_lock_nested(&clc_wait->lock, SINGLE_DEPTH_NESTING); 597 list_splice_init(&smc_wait->head, &clc_wait->head); 598 spin_unlock(&clc_wait->lock); 599 spin_unlock_irqrestore(&smc_wait->lock, flags); 600 } 601 mutex_unlock(&smc->clcsock_release_lock); 602 return 0; 603 } 604 605 /* fall back during connect */ 606 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 607 { 608 struct net *net = sock_net(&smc->sk); 609 int rc = 0; 610 611 rc = smc_switch_to_fallback(smc, reason_code); 612 if (rc) { /* fallback fails */ 613 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 614 if (smc->sk.sk_state == SMC_INIT) 615 sock_put(&smc->sk); /* passive closing */ 616 return rc; 617 } 618 smc_copy_sock_settings_to_clc(smc); 619 smc->connect_nonblock = 0; 620 if (smc->sk.sk_state == SMC_INIT) 621 smc->sk.sk_state = SMC_ACTIVE; 622 return 0; 623 } 624 625 /* decline and fall back during connect */ 626 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 627 u8 version) 628 { 629 struct net *net = sock_net(&smc->sk); 630 int rc; 631 632 if (reason_code < 0) { /* error, fallback is not possible */ 633 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 634 if (smc->sk.sk_state == SMC_INIT) 635 sock_put(&smc->sk); /* passive closing */ 636 return reason_code; 637 } 638 if (reason_code != SMC_CLC_DECL_PEERDECL) { 639 rc = smc_clc_send_decline(smc, reason_code, version); 640 if (rc < 0) { 641 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 642 if (smc->sk.sk_state == SMC_INIT) 643 sock_put(&smc->sk); /* passive closing */ 644 return rc; 645 } 646 } 647 return smc_connect_fallback(smc, reason_code); 648 } 649 650 static void smc_conn_abort(struct smc_sock *smc, int local_first) 651 { 652 struct smc_connection *conn = &smc->conn; 653 struct smc_link_group *lgr = conn->lgr; 654 bool lgr_valid = false; 655 656 if (smc_conn_lgr_valid(conn)) 657 lgr_valid = true; 658 659 smc_conn_free(conn); 660 if (local_first && lgr_valid) 661 smc_lgr_cleanup_early(lgr); 662 } 663 664 /* check if there is a rdma device available for this connection. */ 665 /* called for connect and listen */ 666 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 667 { 668 /* PNET table look up: search active ib_device and port 669 * within same PNETID that also contains the ethernet device 670 * used for the internal TCP socket 671 */ 672 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 673 if (!ini->check_smcrv2 && !ini->ib_dev) 674 return SMC_CLC_DECL_NOSMCRDEV; 675 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) 676 return SMC_CLC_DECL_NOSMCRDEV; 677 return 0; 678 } 679 680 /* check if there is an ISM device available for this connection. */ 681 /* called for connect and listen */ 682 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 683 { 684 /* Find ISM device with same PNETID as connecting interface */ 685 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 686 if (!ini->ism_dev[0]) 687 return SMC_CLC_DECL_NOSMCDDEV; 688 else 689 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 690 return 0; 691 } 692 693 /* is chid unique for the ism devices that are already determined? */ 694 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 695 int cnt) 696 { 697 int i = (!ini->ism_dev[0]) ? 1 : 0; 698 699 for (; i < cnt; i++) 700 if (ini->ism_chid[i] == chid) 701 return false; 702 return true; 703 } 704 705 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus 706 * PNETID matching net_device) 707 */ 708 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 709 struct smc_init_info *ini) 710 { 711 int rc = SMC_CLC_DECL_NOSMCDDEV; 712 struct smcd_dev *smcd; 713 int i = 1; 714 u16 chid; 715 716 if (smcd_indicated(ini->smc_type_v1)) 717 rc = 0; /* already initialized for V1 */ 718 mutex_lock(&smcd_dev_list.mutex); 719 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 720 if (smcd->going_away || smcd == ini->ism_dev[0]) 721 continue; 722 chid = smc_ism_get_chid(smcd); 723 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 724 continue; 725 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 726 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 727 ini->ism_dev[i] = smcd; 728 ini->ism_chid[i] = chid; 729 ini->is_smcd = true; 730 rc = 0; 731 i++; 732 if (i > SMC_MAX_ISM_DEVS) 733 break; 734 } 735 } 736 mutex_unlock(&smcd_dev_list.mutex); 737 ini->ism_offered_cnt = i - 1; 738 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 739 ini->smcd_version = 0; 740 741 return rc; 742 } 743 744 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 745 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 746 struct smc_init_info *ini) 747 { 748 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 749 return SMC_CLC_DECL_ISMVLANERR; 750 return 0; 751 } 752 753 static int smc_find_proposal_devices(struct smc_sock *smc, 754 struct smc_init_info *ini) 755 { 756 int rc = 0; 757 758 /* check if there is an ism device available */ 759 if (!(ini->smcd_version & SMC_V1) || 760 smc_find_ism_device(smc, ini) || 761 smc_connect_ism_vlan_setup(smc, ini)) 762 ini->smcd_version &= ~SMC_V1; 763 /* else ISM V1 is supported for this connection */ 764 765 /* check if there is an rdma device available */ 766 if (!(ini->smcr_version & SMC_V1) || 767 smc_find_rdma_device(smc, ini)) 768 ini->smcr_version &= ~SMC_V1; 769 /* else RDMA is supported for this connection */ 770 771 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 772 ini->smcr_version & SMC_V1); 773 774 /* check if there is an ism v2 device available */ 775 if (!(ini->smcd_version & SMC_V2) || 776 !smc_ism_is_v2_capable() || 777 smc_find_ism_v2_device_clnt(smc, ini)) 778 ini->smcd_version &= ~SMC_V2; 779 780 /* check if there is an rdma v2 device available */ 781 ini->check_smcrv2 = true; 782 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 783 if (!(ini->smcr_version & SMC_V2) || 784 smc->clcsock->sk->sk_family != AF_INET || 785 !smc_clc_ueid_count() || 786 smc_find_rdma_device(smc, ini)) 787 ini->smcr_version &= ~SMC_V2; 788 ini->check_smcrv2 = false; 789 790 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 791 ini->smcr_version & SMC_V2); 792 793 /* if neither ISM nor RDMA are supported, fallback */ 794 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 795 rc = SMC_CLC_DECL_NOSMCDEV; 796 797 return rc; 798 } 799 800 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 801 * used, the VLAN ID will be registered again during the connection setup. 802 */ 803 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 804 struct smc_init_info *ini) 805 { 806 if (!smcd_indicated(ini->smc_type_v1)) 807 return 0; 808 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 809 return SMC_CLC_DECL_CNFERR; 810 return 0; 811 } 812 813 #define SMC_CLC_MAX_ACCEPT_LEN \ 814 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \ 815 sizeof(struct smc_clc_first_contact_ext) + \ 816 sizeof(struct smc_clc_msg_trail)) 817 818 /* CLC handshake during connect */ 819 static int smc_connect_clc(struct smc_sock *smc, 820 struct smc_clc_msg_accept_confirm_v2 *aclc2, 821 struct smc_init_info *ini) 822 { 823 int rc = 0; 824 825 /* do inband token exchange */ 826 rc = smc_clc_send_proposal(smc, ini); 827 if (rc) 828 return rc; 829 /* receive SMC Accept CLC message */ 830 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, 831 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 832 } 833 834 void smc_fill_gid_list(struct smc_link_group *lgr, 835 struct smc_gidlist *gidlist, 836 struct smc_ib_device *known_dev, u8 *known_gid) 837 { 838 struct smc_init_info *alt_ini = NULL; 839 840 memset(gidlist, 0, sizeof(*gidlist)); 841 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 842 843 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 844 if (!alt_ini) 845 goto out; 846 847 alt_ini->vlan_id = lgr->vlan_id; 848 alt_ini->check_smcrv2 = true; 849 alt_ini->smcrv2.saddr = lgr->saddr; 850 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 851 852 if (!alt_ini->smcrv2.ib_dev_v2) 853 goto out; 854 855 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 856 SMC_GID_SIZE); 857 858 out: 859 kfree(alt_ini); 860 } 861 862 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 863 struct smc_clc_msg_accept_confirm *aclc, 864 struct smc_init_info *ini) 865 { 866 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 867 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 868 struct smc_clc_first_contact_ext *fce = 869 (struct smc_clc_first_contact_ext *) 870 (((u8 *)clc_v2) + sizeof(*clc_v2)); 871 872 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 873 return 0; 874 875 if (fce->v2_direct) { 876 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 877 ini->smcrv2.uses_gateway = false; 878 } else { 879 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr, 880 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 881 ini->smcrv2.nexthop_mac, 882 &ini->smcrv2.uses_gateway)) 883 return SMC_CLC_DECL_NOROUTE; 884 if (!ini->smcrv2.uses_gateway) { 885 /* mismatch: peer claims indirect, but its direct */ 886 return SMC_CLC_DECL_NOINDIRECT; 887 } 888 } 889 return 0; 890 } 891 892 /* setup for RDMA connection of client */ 893 static int smc_connect_rdma(struct smc_sock *smc, 894 struct smc_clc_msg_accept_confirm *aclc, 895 struct smc_init_info *ini) 896 { 897 int i, reason_code = 0; 898 struct smc_link *link; 899 u8 *eid = NULL; 900 901 ini->is_smcd = false; 902 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 903 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 904 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 905 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 906 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 907 908 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 909 if (reason_code) 910 return reason_code; 911 912 mutex_lock(&smc_client_lgr_pending); 913 reason_code = smc_conn_create(smc, ini); 914 if (reason_code) { 915 mutex_unlock(&smc_client_lgr_pending); 916 return reason_code; 917 } 918 919 smc_conn_save_peer_info(smc, aclc); 920 921 if (ini->first_contact_local) { 922 link = smc->conn.lnk; 923 } else { 924 /* set link that was assigned by server */ 925 link = NULL; 926 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 927 struct smc_link *l = &smc->conn.lgr->lnk[i]; 928 929 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 930 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 931 SMC_GID_SIZE) && 932 (aclc->hdr.version > SMC_V1 || 933 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 934 sizeof(l->peer_mac)))) { 935 link = l; 936 break; 937 } 938 } 939 if (!link) { 940 reason_code = SMC_CLC_DECL_NOSRVLINK; 941 goto connect_abort; 942 } 943 smc_switch_link_and_count(&smc->conn, link); 944 } 945 946 /* create send buffer and rmb */ 947 if (smc_buf_create(smc, false)) { 948 reason_code = SMC_CLC_DECL_MEM; 949 goto connect_abort; 950 } 951 952 if (ini->first_contact_local) 953 smc_link_save_peer_info(link, aclc, ini); 954 955 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 956 reason_code = SMC_CLC_DECL_ERR_RTOK; 957 goto connect_abort; 958 } 959 960 smc_close_init(smc); 961 smc_rx_init(smc); 962 963 if (ini->first_contact_local) { 964 if (smc_ib_ready_link(link)) { 965 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 966 goto connect_abort; 967 } 968 } else { 969 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 970 reason_code = SMC_CLC_DECL_ERR_REGRMB; 971 goto connect_abort; 972 } 973 } 974 smc_rmb_sync_sg_for_device(&smc->conn); 975 976 if (aclc->hdr.version > SMC_V1) { 977 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 978 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 979 980 eid = clc_v2->r1.eid; 981 if (ini->first_contact_local) 982 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 983 link->smcibdev, link->gid); 984 } 985 986 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 987 aclc->hdr.version, eid, ini); 988 if (reason_code) 989 goto connect_abort; 990 991 smc_tx_init(smc); 992 993 if (ini->first_contact_local) { 994 /* QP confirmation over RoCE fabric */ 995 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 996 reason_code = smcr_clnt_conf_first_link(smc); 997 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 998 if (reason_code) 999 goto connect_abort; 1000 } 1001 mutex_unlock(&smc_client_lgr_pending); 1002 1003 smc_copy_sock_settings_to_clc(smc); 1004 smc->connect_nonblock = 0; 1005 if (smc->sk.sk_state == SMC_INIT) 1006 smc->sk.sk_state = SMC_ACTIVE; 1007 1008 return 0; 1009 connect_abort: 1010 smc_conn_abort(smc, ini->first_contact_local); 1011 mutex_unlock(&smc_client_lgr_pending); 1012 smc->connect_nonblock = 0; 1013 1014 return reason_code; 1015 } 1016 1017 /* The server has chosen one of the proposed ISM devices for the communication. 1018 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 1019 */ 1020 static int 1021 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 1022 struct smc_init_info *ini) 1023 { 1024 int i; 1025 1026 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1027 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1028 ini->ism_selected = i; 1029 return 0; 1030 } 1031 } 1032 1033 return -EPROTO; 1034 } 1035 1036 /* setup for ISM connection of client */ 1037 static int smc_connect_ism(struct smc_sock *smc, 1038 struct smc_clc_msg_accept_confirm *aclc, 1039 struct smc_init_info *ini) 1040 { 1041 u8 *eid = NULL; 1042 int rc = 0; 1043 1044 ini->is_smcd = true; 1045 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1046 1047 if (aclc->hdr.version == SMC_V2) { 1048 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 1049 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1050 1051 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 1052 if (rc) 1053 return rc; 1054 } 1055 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 1056 1057 /* there is only one lgr role for SMC-D; use server lock */ 1058 mutex_lock(&smc_server_lgr_pending); 1059 rc = smc_conn_create(smc, ini); 1060 if (rc) { 1061 mutex_unlock(&smc_server_lgr_pending); 1062 return rc; 1063 } 1064 1065 /* Create send and receive buffers */ 1066 rc = smc_buf_create(smc, true); 1067 if (rc) { 1068 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1069 goto connect_abort; 1070 } 1071 1072 smc_conn_save_peer_info(smc, aclc); 1073 smc_close_init(smc); 1074 smc_rx_init(smc); 1075 smc_tx_init(smc); 1076 1077 if (aclc->hdr.version > SMC_V1) { 1078 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1079 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1080 1081 eid = clc_v2->d1.eid; 1082 } 1083 1084 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1085 aclc->hdr.version, eid, NULL); 1086 if (rc) 1087 goto connect_abort; 1088 mutex_unlock(&smc_server_lgr_pending); 1089 1090 smc_copy_sock_settings_to_clc(smc); 1091 smc->connect_nonblock = 0; 1092 if (smc->sk.sk_state == SMC_INIT) 1093 smc->sk.sk_state = SMC_ACTIVE; 1094 1095 return 0; 1096 connect_abort: 1097 smc_conn_abort(smc, ini->first_contact_local); 1098 mutex_unlock(&smc_server_lgr_pending); 1099 smc->connect_nonblock = 0; 1100 1101 return rc; 1102 } 1103 1104 /* check if received accept type and version matches a proposed one */ 1105 static int smc_connect_check_aclc(struct smc_init_info *ini, 1106 struct smc_clc_msg_accept_confirm *aclc) 1107 { 1108 if (aclc->hdr.typev1 != SMC_TYPE_R && 1109 aclc->hdr.typev1 != SMC_TYPE_D) 1110 return SMC_CLC_DECL_MODEUNSUPP; 1111 1112 if (aclc->hdr.version >= SMC_V2) { 1113 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1114 !smcr_indicated(ini->smc_type_v2)) || 1115 (aclc->hdr.typev1 == SMC_TYPE_D && 1116 !smcd_indicated(ini->smc_type_v2))) 1117 return SMC_CLC_DECL_MODEUNSUPP; 1118 } else { 1119 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1120 !smcr_indicated(ini->smc_type_v1)) || 1121 (aclc->hdr.typev1 == SMC_TYPE_D && 1122 !smcd_indicated(ini->smc_type_v1))) 1123 return SMC_CLC_DECL_MODEUNSUPP; 1124 } 1125 1126 return 0; 1127 } 1128 1129 /* perform steps before actually connecting */ 1130 static int __smc_connect(struct smc_sock *smc) 1131 { 1132 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1133 struct smc_clc_msg_accept_confirm_v2 *aclc2; 1134 struct smc_clc_msg_accept_confirm *aclc; 1135 struct smc_init_info *ini = NULL; 1136 u8 *buf = NULL; 1137 int rc = 0; 1138 1139 if (smc->use_fallback) 1140 return smc_connect_fallback(smc, smc->fallback_rsn); 1141 1142 /* if peer has not signalled SMC-capability, fall back */ 1143 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1144 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1145 1146 /* IPSec connections opt out of SMC optimizations */ 1147 if (using_ipsec(smc)) 1148 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1149 version); 1150 1151 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1152 if (!ini) 1153 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1154 version); 1155 1156 ini->smcd_version = SMC_V1 | SMC_V2; 1157 ini->smcr_version = SMC_V1 | SMC_V2; 1158 ini->smc_type_v1 = SMC_TYPE_B; 1159 ini->smc_type_v2 = SMC_TYPE_B; 1160 1161 /* get vlan id from IP device */ 1162 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1163 ini->smcd_version &= ~SMC_V1; 1164 ini->smcr_version = 0; 1165 ini->smc_type_v1 = SMC_TYPE_N; 1166 if (!ini->smcd_version) { 1167 rc = SMC_CLC_DECL_GETVLANERR; 1168 goto fallback; 1169 } 1170 } 1171 1172 rc = smc_find_proposal_devices(smc, ini); 1173 if (rc) 1174 goto fallback; 1175 1176 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1177 if (!buf) { 1178 rc = SMC_CLC_DECL_MEM; 1179 goto fallback; 1180 } 1181 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1182 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1183 1184 /* perform CLC handshake */ 1185 rc = smc_connect_clc(smc, aclc2, ini); 1186 if (rc) 1187 goto vlan_cleanup; 1188 1189 /* check if smc modes and versions of CLC proposal and accept match */ 1190 rc = smc_connect_check_aclc(ini, aclc); 1191 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1192 if (rc) 1193 goto vlan_cleanup; 1194 1195 /* depending on previous steps, connect using rdma or ism */ 1196 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1197 ini->smcr_version = version; 1198 rc = smc_connect_rdma(smc, aclc, ini); 1199 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1200 ini->smcd_version = version; 1201 rc = smc_connect_ism(smc, aclc, ini); 1202 } 1203 if (rc) 1204 goto vlan_cleanup; 1205 1206 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1207 smc_connect_ism_vlan_cleanup(smc, ini); 1208 kfree(buf); 1209 kfree(ini); 1210 return 0; 1211 1212 vlan_cleanup: 1213 smc_connect_ism_vlan_cleanup(smc, ini); 1214 kfree(buf); 1215 fallback: 1216 kfree(ini); 1217 return smc_connect_decline_fallback(smc, rc, version); 1218 } 1219 1220 static void smc_connect_work(struct work_struct *work) 1221 { 1222 struct smc_sock *smc = container_of(work, struct smc_sock, 1223 connect_work); 1224 long timeo = smc->sk.sk_sndtimeo; 1225 int rc = 0; 1226 1227 if (!timeo) 1228 timeo = MAX_SCHEDULE_TIMEOUT; 1229 lock_sock(smc->clcsock->sk); 1230 if (smc->clcsock->sk->sk_err) { 1231 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1232 } else if ((1 << smc->clcsock->sk->sk_state) & 1233 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1234 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1235 if ((rc == -EPIPE) && 1236 ((1 << smc->clcsock->sk->sk_state) & 1237 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1238 rc = 0; 1239 } 1240 release_sock(smc->clcsock->sk); 1241 lock_sock(&smc->sk); 1242 if (rc != 0 || smc->sk.sk_err) { 1243 smc->sk.sk_state = SMC_CLOSED; 1244 if (rc == -EPIPE || rc == -EAGAIN) 1245 smc->sk.sk_err = EPIPE; 1246 else if (signal_pending(current)) 1247 smc->sk.sk_err = -sock_intr_errno(timeo); 1248 sock_put(&smc->sk); /* passive closing */ 1249 goto out; 1250 } 1251 1252 rc = __smc_connect(smc); 1253 if (rc < 0) 1254 smc->sk.sk_err = -rc; 1255 1256 out: 1257 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1258 if (smc->sk.sk_err) { 1259 smc->sk.sk_state_change(&smc->sk); 1260 } else { /* allow polling before and after fallback decision */ 1261 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1262 smc->sk.sk_write_space(&smc->sk); 1263 } 1264 } 1265 release_sock(&smc->sk); 1266 } 1267 1268 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1269 int alen, int flags) 1270 { 1271 struct sock *sk = sock->sk; 1272 struct smc_sock *smc; 1273 int rc = -EINVAL; 1274 1275 smc = smc_sk(sk); 1276 1277 /* separate smc parameter checking to be safe */ 1278 if (alen < sizeof(addr->sa_family)) 1279 goto out_err; 1280 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1281 goto out_err; 1282 1283 lock_sock(sk); 1284 switch (sk->sk_state) { 1285 default: 1286 goto out; 1287 case SMC_ACTIVE: 1288 rc = -EISCONN; 1289 goto out; 1290 case SMC_INIT: 1291 break; 1292 } 1293 1294 smc_copy_sock_settings_to_clc(smc); 1295 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1296 if (smc->connect_nonblock) { 1297 rc = -EALREADY; 1298 goto out; 1299 } 1300 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1301 if (rc && rc != -EINPROGRESS) 1302 goto out; 1303 1304 sock_hold(&smc->sk); /* sock put in passive closing */ 1305 if (smc->use_fallback) 1306 goto out; 1307 if (flags & O_NONBLOCK) { 1308 if (queue_work(smc_hs_wq, &smc->connect_work)) 1309 smc->connect_nonblock = 1; 1310 rc = -EINPROGRESS; 1311 } else { 1312 rc = __smc_connect(smc); 1313 if (rc < 0) 1314 goto out; 1315 else 1316 rc = 0; /* success cases including fallback */ 1317 } 1318 1319 out: 1320 release_sock(sk); 1321 out_err: 1322 return rc; 1323 } 1324 1325 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1326 { 1327 struct socket *new_clcsock = NULL; 1328 struct sock *lsk = &lsmc->sk; 1329 struct sock *new_sk; 1330 int rc = -EINVAL; 1331 1332 release_sock(lsk); 1333 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1334 if (!new_sk) { 1335 rc = -ENOMEM; 1336 lsk->sk_err = ENOMEM; 1337 *new_smc = NULL; 1338 lock_sock(lsk); 1339 goto out; 1340 } 1341 *new_smc = smc_sk(new_sk); 1342 1343 mutex_lock(&lsmc->clcsock_release_lock); 1344 if (lsmc->clcsock) 1345 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1346 mutex_unlock(&lsmc->clcsock_release_lock); 1347 lock_sock(lsk); 1348 if (rc < 0 && rc != -EAGAIN) 1349 lsk->sk_err = -rc; 1350 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1351 new_sk->sk_prot->unhash(new_sk); 1352 if (new_clcsock) 1353 sock_release(new_clcsock); 1354 new_sk->sk_state = SMC_CLOSED; 1355 sock_set_flag(new_sk, SOCK_DEAD); 1356 sock_put(new_sk); /* final */ 1357 *new_smc = NULL; 1358 goto out; 1359 } 1360 1361 /* new clcsock has inherited the smc listen-specific sk_data_ready 1362 * function; switch it back to the original sk_data_ready function 1363 */ 1364 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1365 (*new_smc)->clcsock = new_clcsock; 1366 out: 1367 return rc; 1368 } 1369 1370 /* add a just created sock to the accept queue of the listen sock as 1371 * candidate for a following socket accept call from user space 1372 */ 1373 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1374 { 1375 struct smc_sock *par = smc_sk(parent); 1376 1377 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1378 spin_lock(&par->accept_q_lock); 1379 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1380 spin_unlock(&par->accept_q_lock); 1381 sk_acceptq_added(parent); 1382 } 1383 1384 /* remove a socket from the accept queue of its parental listening socket */ 1385 static void smc_accept_unlink(struct sock *sk) 1386 { 1387 struct smc_sock *par = smc_sk(sk)->listen_smc; 1388 1389 spin_lock(&par->accept_q_lock); 1390 list_del_init(&smc_sk(sk)->accept_q); 1391 spin_unlock(&par->accept_q_lock); 1392 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1393 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1394 } 1395 1396 /* remove a sock from the accept queue to bind it to a new socket created 1397 * for a socket accept call from user space 1398 */ 1399 struct sock *smc_accept_dequeue(struct sock *parent, 1400 struct socket *new_sock) 1401 { 1402 struct smc_sock *isk, *n; 1403 struct sock *new_sk; 1404 1405 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1406 new_sk = (struct sock *)isk; 1407 1408 smc_accept_unlink(new_sk); 1409 if (new_sk->sk_state == SMC_CLOSED) { 1410 new_sk->sk_prot->unhash(new_sk); 1411 if (isk->clcsock) { 1412 sock_release(isk->clcsock); 1413 isk->clcsock = NULL; 1414 } 1415 sock_put(new_sk); /* final */ 1416 continue; 1417 } 1418 if (new_sock) { 1419 sock_graft(new_sk, new_sock); 1420 if (isk->use_fallback) { 1421 smc_sk(new_sk)->clcsock->file = new_sock->file; 1422 isk->clcsock->file->private_data = isk->clcsock; 1423 } 1424 } 1425 return new_sk; 1426 } 1427 return NULL; 1428 } 1429 1430 /* clean up for a created but never accepted sock */ 1431 void smc_close_non_accepted(struct sock *sk) 1432 { 1433 struct smc_sock *smc = smc_sk(sk); 1434 1435 sock_hold(sk); /* sock_put below */ 1436 lock_sock(sk); 1437 if (!sk->sk_lingertime) 1438 /* wait for peer closing */ 1439 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1440 __smc_release(smc); 1441 release_sock(sk); 1442 sock_put(sk); /* sock_hold above */ 1443 sock_put(sk); /* final sock_put */ 1444 } 1445 1446 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1447 { 1448 struct smc_link *link = smc->conn.lnk; 1449 struct smc_llc_qentry *qentry; 1450 int rc; 1451 1452 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1453 return SMC_CLC_DECL_ERR_REGRMB; 1454 1455 /* send CONFIRM LINK request to client over the RoCE fabric */ 1456 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1457 if (rc < 0) 1458 return SMC_CLC_DECL_TIMEOUT_CL; 1459 1460 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1461 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1462 SMC_LLC_CONFIRM_LINK); 1463 if (!qentry) { 1464 struct smc_clc_msg_decline dclc; 1465 1466 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1467 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1468 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1469 } 1470 smc_llc_save_peer_uid(qentry); 1471 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1472 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1473 if (rc) 1474 return SMC_CLC_DECL_RMBE_EC; 1475 1476 /* confirm_rkey is implicit on 1st contact */ 1477 smc->conn.rmb_desc->is_conf_rkey = true; 1478 1479 smc_llc_link_active(link); 1480 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1481 1482 /* initial contact - try to establish second link */ 1483 smc_llc_srv_add_link(link, NULL); 1484 return 0; 1485 } 1486 1487 /* listen worker: finish */ 1488 static void smc_listen_out(struct smc_sock *new_smc) 1489 { 1490 struct smc_sock *lsmc = new_smc->listen_smc; 1491 struct sock *newsmcsk = &new_smc->sk; 1492 1493 if (lsmc->sk.sk_state == SMC_LISTEN) { 1494 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1495 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1496 release_sock(&lsmc->sk); 1497 } else { /* no longer listening */ 1498 smc_close_non_accepted(newsmcsk); 1499 } 1500 1501 /* Wake up accept */ 1502 lsmc->sk.sk_data_ready(&lsmc->sk); 1503 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1504 } 1505 1506 /* listen worker: finish in state connected */ 1507 static void smc_listen_out_connected(struct smc_sock *new_smc) 1508 { 1509 struct sock *newsmcsk = &new_smc->sk; 1510 1511 sk_refcnt_debug_inc(newsmcsk); 1512 if (newsmcsk->sk_state == SMC_INIT) 1513 newsmcsk->sk_state = SMC_ACTIVE; 1514 1515 smc_listen_out(new_smc); 1516 } 1517 1518 /* listen worker: finish in error state */ 1519 static void smc_listen_out_err(struct smc_sock *new_smc) 1520 { 1521 struct sock *newsmcsk = &new_smc->sk; 1522 struct net *net = sock_net(newsmcsk); 1523 1524 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1525 if (newsmcsk->sk_state == SMC_INIT) 1526 sock_put(&new_smc->sk); /* passive closing */ 1527 newsmcsk->sk_state = SMC_CLOSED; 1528 1529 smc_listen_out(new_smc); 1530 } 1531 1532 /* listen worker: decline and fall back if possible */ 1533 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1534 int local_first, u8 version) 1535 { 1536 /* RDMA setup failed, switch back to TCP */ 1537 smc_conn_abort(new_smc, local_first); 1538 if (reason_code < 0 || 1539 smc_switch_to_fallback(new_smc, reason_code)) { 1540 /* error, no fallback possible */ 1541 smc_listen_out_err(new_smc); 1542 return; 1543 } 1544 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1545 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1546 smc_listen_out_err(new_smc); 1547 return; 1548 } 1549 } 1550 smc_listen_out_connected(new_smc); 1551 } 1552 1553 /* listen worker: version checking */ 1554 static int smc_listen_v2_check(struct smc_sock *new_smc, 1555 struct smc_clc_msg_proposal *pclc, 1556 struct smc_init_info *ini) 1557 { 1558 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1559 struct smc_clc_v2_extension *pclc_v2_ext; 1560 int rc = SMC_CLC_DECL_PEERNOSMC; 1561 1562 ini->smc_type_v1 = pclc->hdr.typev1; 1563 ini->smc_type_v2 = pclc->hdr.typev2; 1564 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1565 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1566 if (pclc->hdr.version > SMC_V1) { 1567 if (smcd_indicated(ini->smc_type_v2)) 1568 ini->smcd_version |= SMC_V2; 1569 if (smcr_indicated(ini->smc_type_v2)) 1570 ini->smcr_version |= SMC_V2; 1571 } 1572 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 1573 rc = SMC_CLC_DECL_PEERNOSMC; 1574 goto out; 1575 } 1576 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1577 if (!pclc_v2_ext) { 1578 ini->smcd_version &= ~SMC_V2; 1579 ini->smcr_version &= ~SMC_V2; 1580 rc = SMC_CLC_DECL_NOV2EXT; 1581 goto out; 1582 } 1583 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1584 if (ini->smcd_version & SMC_V2) { 1585 if (!smc_ism_is_v2_capable()) { 1586 ini->smcd_version &= ~SMC_V2; 1587 rc = SMC_CLC_DECL_NOISM2SUPP; 1588 } else if (!pclc_smcd_v2_ext) { 1589 ini->smcd_version &= ~SMC_V2; 1590 rc = SMC_CLC_DECL_NOV2DEXT; 1591 } else if (!pclc_v2_ext->hdr.eid_cnt && 1592 !pclc_v2_ext->hdr.flag.seid) { 1593 ini->smcd_version &= ~SMC_V2; 1594 rc = SMC_CLC_DECL_NOUEID; 1595 } 1596 } 1597 if (ini->smcr_version & SMC_V2) { 1598 if (!pclc_v2_ext->hdr.eid_cnt) { 1599 ini->smcr_version &= ~SMC_V2; 1600 rc = SMC_CLC_DECL_NOUEID; 1601 } 1602 } 1603 1604 out: 1605 if (!ini->smcd_version && !ini->smcr_version) 1606 return rc; 1607 1608 return 0; 1609 } 1610 1611 /* listen worker: check prefixes */ 1612 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1613 struct smc_clc_msg_proposal *pclc) 1614 { 1615 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1616 struct socket *newclcsock = new_smc->clcsock; 1617 1618 if (pclc->hdr.typev1 == SMC_TYPE_N) 1619 return 0; 1620 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1621 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1622 return SMC_CLC_DECL_DIFFPREFIX; 1623 1624 return 0; 1625 } 1626 1627 /* listen worker: initialize connection and buffers */ 1628 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1629 struct smc_init_info *ini) 1630 { 1631 int rc; 1632 1633 /* allocate connection / link group */ 1634 rc = smc_conn_create(new_smc, ini); 1635 if (rc) 1636 return rc; 1637 1638 /* create send buffer and rmb */ 1639 if (smc_buf_create(new_smc, false)) 1640 return SMC_CLC_DECL_MEM; 1641 1642 return 0; 1643 } 1644 1645 /* listen worker: initialize connection and buffers for SMC-D */ 1646 static int smc_listen_ism_init(struct smc_sock *new_smc, 1647 struct smc_init_info *ini) 1648 { 1649 int rc; 1650 1651 rc = smc_conn_create(new_smc, ini); 1652 if (rc) 1653 return rc; 1654 1655 /* Create send and receive buffers */ 1656 rc = smc_buf_create(new_smc, true); 1657 if (rc) { 1658 smc_conn_abort(new_smc, ini->first_contact_local); 1659 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1660 SMC_CLC_DECL_MEM; 1661 } 1662 1663 return 0; 1664 } 1665 1666 static bool smc_is_already_selected(struct smcd_dev *smcd, 1667 struct smc_init_info *ini, 1668 int matches) 1669 { 1670 int i; 1671 1672 for (i = 0; i < matches; i++) 1673 if (smcd == ini->ism_dev[i]) 1674 return true; 1675 1676 return false; 1677 } 1678 1679 /* check for ISM devices matching proposed ISM devices */ 1680 static void smc_check_ism_v2_match(struct smc_init_info *ini, 1681 u16 proposed_chid, u64 proposed_gid, 1682 unsigned int *matches) 1683 { 1684 struct smcd_dev *smcd; 1685 1686 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1687 if (smcd->going_away) 1688 continue; 1689 if (smc_is_already_selected(smcd, ini, *matches)) 1690 continue; 1691 if (smc_ism_get_chid(smcd) == proposed_chid && 1692 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1693 ini->ism_peer_gid[*matches] = proposed_gid; 1694 ini->ism_dev[*matches] = smcd; 1695 (*matches)++; 1696 break; 1697 } 1698 } 1699 } 1700 1701 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 1702 { 1703 if (!ini->rc) 1704 ini->rc = rc; 1705 } 1706 1707 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1708 struct smc_clc_msg_proposal *pclc, 1709 struct smc_init_info *ini) 1710 { 1711 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1712 struct smc_clc_v2_extension *smc_v2_ext; 1713 struct smc_clc_msg_smcd *pclc_smcd; 1714 unsigned int matches = 0; 1715 u8 smcd_version; 1716 u8 *eid = NULL; 1717 int i, rc; 1718 1719 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1720 goto not_found; 1721 1722 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1723 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1724 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1725 1726 mutex_lock(&smcd_dev_list.mutex); 1727 if (pclc_smcd->ism.chid) 1728 /* check for ISM device matching proposed native ISM device */ 1729 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1730 ntohll(pclc_smcd->ism.gid), &matches); 1731 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1732 /* check for ISM devices matching proposed non-native ISM 1733 * devices 1734 */ 1735 smc_check_ism_v2_match(ini, 1736 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1737 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1738 &matches); 1739 } 1740 mutex_unlock(&smcd_dev_list.mutex); 1741 1742 if (!ini->ism_dev[0]) { 1743 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 1744 goto not_found; 1745 } 1746 1747 smc_ism_get_system_eid(&eid); 1748 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 1749 smcd_v2_ext->system_eid, eid)) 1750 goto not_found; 1751 1752 /* separate - outside the smcd_dev_list.lock */ 1753 smcd_version = ini->smcd_version; 1754 for (i = 0; i < matches; i++) { 1755 ini->smcd_version = SMC_V2; 1756 ini->is_smcd = true; 1757 ini->ism_selected = i; 1758 rc = smc_listen_ism_init(new_smc, ini); 1759 if (rc) { 1760 smc_find_ism_store_rc(rc, ini); 1761 /* try next active ISM device */ 1762 continue; 1763 } 1764 return; /* matching and usable V2 ISM device found */ 1765 } 1766 /* no V2 ISM device could be initialized */ 1767 ini->smcd_version = smcd_version; /* restore original value */ 1768 ini->negotiated_eid[0] = 0; 1769 1770 not_found: 1771 ini->smcd_version &= ~SMC_V2; 1772 ini->ism_dev[0] = NULL; 1773 ini->is_smcd = false; 1774 } 1775 1776 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1777 struct smc_clc_msg_proposal *pclc, 1778 struct smc_init_info *ini) 1779 { 1780 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1781 int rc = 0; 1782 1783 /* check if ISM V1 is available */ 1784 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1785 goto not_found; 1786 ini->is_smcd = true; /* prepare ISM check */ 1787 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1788 rc = smc_find_ism_device(new_smc, ini); 1789 if (rc) 1790 goto not_found; 1791 ini->ism_selected = 0; 1792 rc = smc_listen_ism_init(new_smc, ini); 1793 if (!rc) 1794 return; /* V1 ISM device found */ 1795 1796 not_found: 1797 smc_find_ism_store_rc(rc, ini); 1798 ini->smcd_version &= ~SMC_V1; 1799 ini->ism_dev[0] = NULL; 1800 ini->is_smcd = false; 1801 } 1802 1803 /* listen worker: register buffers */ 1804 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1805 { 1806 struct smc_connection *conn = &new_smc->conn; 1807 1808 if (!local_first) { 1809 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1810 return SMC_CLC_DECL_ERR_REGRMB; 1811 } 1812 smc_rmb_sync_sg_for_device(&new_smc->conn); 1813 1814 return 0; 1815 } 1816 1817 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 1818 struct smc_clc_msg_proposal *pclc, 1819 struct smc_init_info *ini) 1820 { 1821 struct smc_clc_v2_extension *smc_v2_ext; 1822 u8 smcr_version; 1823 int rc; 1824 1825 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 1826 goto not_found; 1827 1828 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1829 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 1830 goto not_found; 1831 1832 /* prepare RDMA check */ 1833 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1834 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 1835 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1836 ini->check_smcrv2 = true; 1837 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 1838 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 1839 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 1840 rc = smc_find_rdma_device(new_smc, ini); 1841 if (rc) { 1842 smc_find_ism_store_rc(rc, ini); 1843 goto not_found; 1844 } 1845 if (!ini->smcrv2.uses_gateway) 1846 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 1847 1848 smcr_version = ini->smcr_version; 1849 ini->smcr_version = SMC_V2; 1850 rc = smc_listen_rdma_init(new_smc, ini); 1851 if (!rc) 1852 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1853 if (!rc) 1854 return; 1855 ini->smcr_version = smcr_version; 1856 smc_find_ism_store_rc(rc, ini); 1857 1858 not_found: 1859 ini->smcr_version &= ~SMC_V2; 1860 ini->check_smcrv2 = false; 1861 } 1862 1863 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1864 struct smc_clc_msg_proposal *pclc, 1865 struct smc_init_info *ini) 1866 { 1867 int rc; 1868 1869 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 1870 return SMC_CLC_DECL_NOSMCDEV; 1871 1872 /* prepare RDMA check */ 1873 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1874 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 1875 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1876 rc = smc_find_rdma_device(new_smc, ini); 1877 if (rc) { 1878 /* no RDMA device found */ 1879 return SMC_CLC_DECL_NOSMCDEV; 1880 } 1881 rc = smc_listen_rdma_init(new_smc, ini); 1882 if (rc) 1883 return rc; 1884 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1885 } 1886 1887 /* determine the local device matching to proposal */ 1888 static int smc_listen_find_device(struct smc_sock *new_smc, 1889 struct smc_clc_msg_proposal *pclc, 1890 struct smc_init_info *ini) 1891 { 1892 int prfx_rc; 1893 1894 /* check for ISM device matching V2 proposed device */ 1895 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 1896 if (ini->ism_dev[0]) 1897 return 0; 1898 1899 /* check for matching IP prefix and subnet length (V1) */ 1900 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 1901 if (prfx_rc) 1902 smc_find_ism_store_rc(prfx_rc, ini); 1903 1904 /* get vlan id from IP device */ 1905 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 1906 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 1907 1908 /* check for ISM device matching V1 proposed device */ 1909 if (!prfx_rc) 1910 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 1911 if (ini->ism_dev[0]) 1912 return 0; 1913 1914 if (!smcr_indicated(pclc->hdr.typev1) && 1915 !smcr_indicated(pclc->hdr.typev2)) 1916 /* skip RDMA and decline */ 1917 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 1918 1919 /* check if RDMA V2 is available */ 1920 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 1921 if (ini->smcrv2.ib_dev_v2) 1922 return 0; 1923 1924 /* check if RDMA V1 is available */ 1925 if (!prfx_rc) { 1926 int rc; 1927 1928 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 1929 smc_find_ism_store_rc(rc, ini); 1930 return (!rc) ? 0 : ini->rc; 1931 } 1932 return SMC_CLC_DECL_NOSMCDEV; 1933 } 1934 1935 /* listen worker: finish RDMA setup */ 1936 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 1937 struct smc_clc_msg_accept_confirm *cclc, 1938 bool local_first, 1939 struct smc_init_info *ini) 1940 { 1941 struct smc_link *link = new_smc->conn.lnk; 1942 int reason_code = 0; 1943 1944 if (local_first) 1945 smc_link_save_peer_info(link, cclc, ini); 1946 1947 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 1948 return SMC_CLC_DECL_ERR_RTOK; 1949 1950 if (local_first) { 1951 if (smc_ib_ready_link(link)) 1952 return SMC_CLC_DECL_ERR_RDYLNK; 1953 /* QP confirmation over RoCE fabric */ 1954 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1955 reason_code = smcr_serv_conf_first_link(new_smc); 1956 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1957 } 1958 return reason_code; 1959 } 1960 1961 /* setup for connection of server */ 1962 static void smc_listen_work(struct work_struct *work) 1963 { 1964 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1965 smc_listen_work); 1966 struct socket *newclcsock = new_smc->clcsock; 1967 struct smc_clc_msg_accept_confirm *cclc; 1968 struct smc_clc_msg_proposal_area *buf; 1969 struct smc_clc_msg_proposal *pclc; 1970 struct smc_init_info *ini = NULL; 1971 u8 proposal_version = SMC_V1; 1972 u8 accept_version; 1973 int rc = 0; 1974 1975 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 1976 return smc_listen_out_err(new_smc); 1977 1978 if (new_smc->use_fallback) { 1979 smc_listen_out_connected(new_smc); 1980 return; 1981 } 1982 1983 /* check if peer is smc capable */ 1984 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1985 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 1986 if (rc) 1987 smc_listen_out_err(new_smc); 1988 else 1989 smc_listen_out_connected(new_smc); 1990 return; 1991 } 1992 1993 /* do inband token exchange - 1994 * wait for and receive SMC Proposal CLC message 1995 */ 1996 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 1997 if (!buf) { 1998 rc = SMC_CLC_DECL_MEM; 1999 goto out_decl; 2000 } 2001 pclc = (struct smc_clc_msg_proposal *)buf; 2002 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 2003 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 2004 if (rc) 2005 goto out_decl; 2006 2007 if (pclc->hdr.version > SMC_V1) 2008 proposal_version = SMC_V2; 2009 2010 /* IPSec connections opt out of SMC optimizations */ 2011 if (using_ipsec(new_smc)) { 2012 rc = SMC_CLC_DECL_IPSEC; 2013 goto out_decl; 2014 } 2015 2016 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 2017 if (!ini) { 2018 rc = SMC_CLC_DECL_MEM; 2019 goto out_decl; 2020 } 2021 2022 /* initial version checking */ 2023 rc = smc_listen_v2_check(new_smc, pclc, ini); 2024 if (rc) 2025 goto out_decl; 2026 2027 mutex_lock(&smc_server_lgr_pending); 2028 smc_close_init(new_smc); 2029 smc_rx_init(new_smc); 2030 smc_tx_init(new_smc); 2031 2032 /* determine ISM or RoCE device used for connection */ 2033 rc = smc_listen_find_device(new_smc, pclc, ini); 2034 if (rc) 2035 goto out_unlock; 2036 2037 /* send SMC Accept CLC message */ 2038 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2039 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2040 accept_version, ini->negotiated_eid); 2041 if (rc) 2042 goto out_unlock; 2043 2044 /* SMC-D does not need this lock any more */ 2045 if (ini->is_smcd) 2046 mutex_unlock(&smc_server_lgr_pending); 2047 2048 /* receive SMC Confirm CLC message */ 2049 memset(buf, 0, sizeof(*buf)); 2050 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2051 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2052 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2053 if (rc) { 2054 if (!ini->is_smcd) 2055 goto out_unlock; 2056 goto out_decl; 2057 } 2058 2059 /* finish worker */ 2060 if (!ini->is_smcd) { 2061 rc = smc_listen_rdma_finish(new_smc, cclc, 2062 ini->first_contact_local, ini); 2063 if (rc) 2064 goto out_unlock; 2065 mutex_unlock(&smc_server_lgr_pending); 2066 } 2067 smc_conn_save_peer_info(new_smc, cclc); 2068 smc_listen_out_connected(new_smc); 2069 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2070 goto out_free; 2071 2072 out_unlock: 2073 mutex_unlock(&smc_server_lgr_pending); 2074 out_decl: 2075 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2076 proposal_version); 2077 out_free: 2078 kfree(ini); 2079 kfree(buf); 2080 } 2081 2082 static void smc_tcp_listen_work(struct work_struct *work) 2083 { 2084 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2085 tcp_listen_work); 2086 struct sock *lsk = &lsmc->sk; 2087 struct smc_sock *new_smc; 2088 int rc = 0; 2089 2090 lock_sock(lsk); 2091 while (lsk->sk_state == SMC_LISTEN) { 2092 rc = smc_clcsock_accept(lsmc, &new_smc); 2093 if (rc) /* clcsock accept queue empty or error */ 2094 goto out; 2095 if (!new_smc) 2096 continue; 2097 2098 new_smc->listen_smc = lsmc; 2099 new_smc->use_fallback = lsmc->use_fallback; 2100 new_smc->fallback_rsn = lsmc->fallback_rsn; 2101 sock_hold(lsk); /* sock_put in smc_listen_work */ 2102 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2103 smc_copy_sock_settings_to_smc(new_smc); 2104 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 2105 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 2106 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2107 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2108 sock_put(&new_smc->sk); 2109 } 2110 2111 out: 2112 release_sock(lsk); 2113 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2114 } 2115 2116 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2117 { 2118 struct smc_sock *lsmc; 2119 2120 lsmc = (struct smc_sock *) 2121 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY); 2122 if (!lsmc) 2123 return; 2124 lsmc->clcsk_data_ready(listen_clcsock); 2125 if (lsmc->sk.sk_state == SMC_LISTEN) { 2126 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2127 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 2128 sock_put(&lsmc->sk); 2129 } 2130 } 2131 2132 static int smc_listen(struct socket *sock, int backlog) 2133 { 2134 struct sock *sk = sock->sk; 2135 struct smc_sock *smc; 2136 int rc; 2137 2138 smc = smc_sk(sk); 2139 lock_sock(sk); 2140 2141 rc = -EINVAL; 2142 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2143 smc->connect_nonblock) 2144 goto out; 2145 2146 rc = 0; 2147 if (sk->sk_state == SMC_LISTEN) { 2148 sk->sk_max_ack_backlog = backlog; 2149 goto out; 2150 } 2151 /* some socket options are handled in core, so we could not apply 2152 * them to the clc socket -- copy smc socket options to clc socket 2153 */ 2154 smc_copy_sock_settings_to_clc(smc); 2155 if (!smc->use_fallback) 2156 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2157 2158 /* save original sk_data_ready function and establish 2159 * smc-specific sk_data_ready function 2160 */ 2161 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 2162 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 2163 smc->clcsock->sk->sk_user_data = 2164 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2165 rc = kernel_listen(smc->clcsock, backlog); 2166 if (rc) { 2167 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready; 2168 goto out; 2169 } 2170 sk->sk_max_ack_backlog = backlog; 2171 sk->sk_ack_backlog = 0; 2172 sk->sk_state = SMC_LISTEN; 2173 2174 out: 2175 release_sock(sk); 2176 return rc; 2177 } 2178 2179 static int smc_accept(struct socket *sock, struct socket *new_sock, 2180 int flags, bool kern) 2181 { 2182 struct sock *sk = sock->sk, *nsk; 2183 DECLARE_WAITQUEUE(wait, current); 2184 struct smc_sock *lsmc; 2185 long timeo; 2186 int rc = 0; 2187 2188 lsmc = smc_sk(sk); 2189 sock_hold(sk); /* sock_put below */ 2190 lock_sock(sk); 2191 2192 if (lsmc->sk.sk_state != SMC_LISTEN) { 2193 rc = -EINVAL; 2194 release_sock(sk); 2195 goto out; 2196 } 2197 2198 /* Wait for an incoming connection */ 2199 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2200 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2201 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2202 set_current_state(TASK_INTERRUPTIBLE); 2203 if (!timeo) { 2204 rc = -EAGAIN; 2205 break; 2206 } 2207 release_sock(sk); 2208 timeo = schedule_timeout(timeo); 2209 /* wakeup by sk_data_ready in smc_listen_work() */ 2210 sched_annotate_sleep(); 2211 lock_sock(sk); 2212 if (signal_pending(current)) { 2213 rc = sock_intr_errno(timeo); 2214 break; 2215 } 2216 } 2217 set_current_state(TASK_RUNNING); 2218 remove_wait_queue(sk_sleep(sk), &wait); 2219 2220 if (!rc) 2221 rc = sock_error(nsk); 2222 release_sock(sk); 2223 if (rc) 2224 goto out; 2225 2226 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 2227 /* wait till data arrives on the socket */ 2228 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 2229 MSEC_PER_SEC); 2230 if (smc_sk(nsk)->use_fallback) { 2231 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2232 2233 lock_sock(clcsk); 2234 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2235 sk_wait_data(clcsk, &timeo, NULL); 2236 release_sock(clcsk); 2237 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2238 lock_sock(nsk); 2239 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 2240 release_sock(nsk); 2241 } 2242 } 2243 2244 out: 2245 sock_put(sk); /* sock_hold above */ 2246 return rc; 2247 } 2248 2249 static int smc_getname(struct socket *sock, struct sockaddr *addr, 2250 int peer) 2251 { 2252 struct smc_sock *smc; 2253 2254 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2255 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2256 return -ENOTCONN; 2257 2258 smc = smc_sk(sock->sk); 2259 2260 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2261 } 2262 2263 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2264 { 2265 struct sock *sk = sock->sk; 2266 struct smc_sock *smc; 2267 int rc = -EPIPE; 2268 2269 smc = smc_sk(sk); 2270 lock_sock(sk); 2271 if ((sk->sk_state != SMC_ACTIVE) && 2272 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2273 (sk->sk_state != SMC_INIT)) 2274 goto out; 2275 2276 if (msg->msg_flags & MSG_FASTOPEN) { 2277 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2278 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2279 if (rc) 2280 goto out; 2281 } else { 2282 rc = -EINVAL; 2283 goto out; 2284 } 2285 } 2286 2287 if (smc->use_fallback) { 2288 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2289 } else { 2290 rc = smc_tx_sendmsg(smc, msg, len); 2291 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2292 } 2293 out: 2294 release_sock(sk); 2295 return rc; 2296 } 2297 2298 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2299 int flags) 2300 { 2301 struct sock *sk = sock->sk; 2302 struct smc_sock *smc; 2303 int rc = -ENOTCONN; 2304 2305 smc = smc_sk(sk); 2306 lock_sock(sk); 2307 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2308 /* socket was connected before, no more data to read */ 2309 rc = 0; 2310 goto out; 2311 } 2312 if ((sk->sk_state == SMC_INIT) || 2313 (sk->sk_state == SMC_LISTEN) || 2314 (sk->sk_state == SMC_CLOSED)) 2315 goto out; 2316 2317 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2318 rc = 0; 2319 goto out; 2320 } 2321 2322 if (smc->use_fallback) { 2323 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2324 } else { 2325 msg->msg_namelen = 0; 2326 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2327 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2328 } 2329 2330 out: 2331 release_sock(sk); 2332 return rc; 2333 } 2334 2335 static __poll_t smc_accept_poll(struct sock *parent) 2336 { 2337 struct smc_sock *isk = smc_sk(parent); 2338 __poll_t mask = 0; 2339 2340 spin_lock(&isk->accept_q_lock); 2341 if (!list_empty(&isk->accept_q)) 2342 mask = EPOLLIN | EPOLLRDNORM; 2343 spin_unlock(&isk->accept_q_lock); 2344 2345 return mask; 2346 } 2347 2348 static __poll_t smc_poll(struct file *file, struct socket *sock, 2349 poll_table *wait) 2350 { 2351 struct sock *sk = sock->sk; 2352 struct smc_sock *smc; 2353 __poll_t mask = 0; 2354 2355 if (!sk) 2356 return EPOLLNVAL; 2357 2358 smc = smc_sk(sock->sk); 2359 if (smc->use_fallback) { 2360 /* delegate to CLC child sock */ 2361 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2362 sk->sk_err = smc->clcsock->sk->sk_err; 2363 } else { 2364 if (sk->sk_state != SMC_CLOSED) 2365 sock_poll_wait(file, sock, wait); 2366 if (sk->sk_err) 2367 mask |= EPOLLERR; 2368 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2369 (sk->sk_state == SMC_CLOSED)) 2370 mask |= EPOLLHUP; 2371 if (sk->sk_state == SMC_LISTEN) { 2372 /* woken up by sk_data_ready in smc_listen_work() */ 2373 mask |= smc_accept_poll(sk); 2374 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2375 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2376 wait); 2377 sk->sk_err = smc->clcsock->sk->sk_err; 2378 } else { 2379 if ((sk->sk_state != SMC_INIT && 2380 atomic_read(&smc->conn.sndbuf_space)) || 2381 sk->sk_shutdown & SEND_SHUTDOWN) { 2382 mask |= EPOLLOUT | EPOLLWRNORM; 2383 } else { 2384 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2385 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2386 } 2387 if (atomic_read(&smc->conn.bytes_to_rcv)) 2388 mask |= EPOLLIN | EPOLLRDNORM; 2389 if (sk->sk_shutdown & RCV_SHUTDOWN) 2390 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2391 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2392 mask |= EPOLLIN; 2393 if (smc->conn.urg_state == SMC_URG_VALID) 2394 mask |= EPOLLPRI; 2395 } 2396 } 2397 2398 return mask; 2399 } 2400 2401 static int smc_shutdown(struct socket *sock, int how) 2402 { 2403 struct sock *sk = sock->sk; 2404 bool do_shutdown = true; 2405 struct smc_sock *smc; 2406 int rc = -EINVAL; 2407 int old_state; 2408 int rc1 = 0; 2409 2410 smc = smc_sk(sk); 2411 2412 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2413 return rc; 2414 2415 lock_sock(sk); 2416 2417 rc = -ENOTCONN; 2418 if ((sk->sk_state != SMC_ACTIVE) && 2419 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2420 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2421 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2422 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2423 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2424 goto out; 2425 if (smc->use_fallback) { 2426 rc = kernel_sock_shutdown(smc->clcsock, how); 2427 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2428 if (sk->sk_shutdown == SHUTDOWN_MASK) 2429 sk->sk_state = SMC_CLOSED; 2430 goto out; 2431 } 2432 switch (how) { 2433 case SHUT_RDWR: /* shutdown in both directions */ 2434 old_state = sk->sk_state; 2435 rc = smc_close_active(smc); 2436 if (old_state == SMC_ACTIVE && 2437 sk->sk_state == SMC_PEERCLOSEWAIT1) 2438 do_shutdown = false; 2439 break; 2440 case SHUT_WR: 2441 rc = smc_close_shutdown_write(smc); 2442 break; 2443 case SHUT_RD: 2444 rc = 0; 2445 /* nothing more to do because peer is not involved */ 2446 break; 2447 } 2448 if (do_shutdown && smc->clcsock) 2449 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2450 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2451 sk->sk_shutdown |= how + 1; 2452 2453 out: 2454 release_sock(sk); 2455 return rc ? rc : rc1; 2456 } 2457 2458 static int smc_setsockopt(struct socket *sock, int level, int optname, 2459 sockptr_t optval, unsigned int optlen) 2460 { 2461 struct sock *sk = sock->sk; 2462 struct smc_sock *smc; 2463 int val, rc; 2464 2465 if (level == SOL_TCP && optname == TCP_ULP) 2466 return -EOPNOTSUPP; 2467 2468 smc = smc_sk(sk); 2469 2470 /* generic setsockopts reaching us here always apply to the 2471 * CLC socket 2472 */ 2473 mutex_lock(&smc->clcsock_release_lock); 2474 if (!smc->clcsock) { 2475 mutex_unlock(&smc->clcsock_release_lock); 2476 return -EBADF; 2477 } 2478 if (unlikely(!smc->clcsock->ops->setsockopt)) 2479 rc = -EOPNOTSUPP; 2480 else 2481 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2482 optval, optlen); 2483 if (smc->clcsock->sk->sk_err) { 2484 sk->sk_err = smc->clcsock->sk->sk_err; 2485 sk_error_report(sk); 2486 } 2487 mutex_unlock(&smc->clcsock_release_lock); 2488 2489 if (optlen < sizeof(int)) 2490 return -EINVAL; 2491 if (copy_from_sockptr(&val, optval, sizeof(int))) 2492 return -EFAULT; 2493 2494 lock_sock(sk); 2495 if (rc || smc->use_fallback) 2496 goto out; 2497 switch (optname) { 2498 case TCP_FASTOPEN: 2499 case TCP_FASTOPEN_CONNECT: 2500 case TCP_FASTOPEN_KEY: 2501 case TCP_FASTOPEN_NO_COOKIE: 2502 /* option not supported by SMC */ 2503 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2504 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2505 } else { 2506 rc = -EINVAL; 2507 } 2508 break; 2509 case TCP_NODELAY: 2510 if (sk->sk_state != SMC_INIT && 2511 sk->sk_state != SMC_LISTEN && 2512 sk->sk_state != SMC_CLOSED) { 2513 if (val) { 2514 SMC_STAT_INC(smc, ndly_cnt); 2515 mod_delayed_work(smc->conn.lgr->tx_wq, 2516 &smc->conn.tx_work, 0); 2517 } 2518 } 2519 break; 2520 case TCP_CORK: 2521 if (sk->sk_state != SMC_INIT && 2522 sk->sk_state != SMC_LISTEN && 2523 sk->sk_state != SMC_CLOSED) { 2524 if (!val) { 2525 SMC_STAT_INC(smc, cork_cnt); 2526 mod_delayed_work(smc->conn.lgr->tx_wq, 2527 &smc->conn.tx_work, 0); 2528 } 2529 } 2530 break; 2531 case TCP_DEFER_ACCEPT: 2532 smc->sockopt_defer_accept = val; 2533 break; 2534 default: 2535 break; 2536 } 2537 out: 2538 release_sock(sk); 2539 2540 return rc; 2541 } 2542 2543 static int smc_getsockopt(struct socket *sock, int level, int optname, 2544 char __user *optval, int __user *optlen) 2545 { 2546 struct smc_sock *smc; 2547 int rc; 2548 2549 smc = smc_sk(sock->sk); 2550 mutex_lock(&smc->clcsock_release_lock); 2551 if (!smc->clcsock) { 2552 mutex_unlock(&smc->clcsock_release_lock); 2553 return -EBADF; 2554 } 2555 /* socket options apply to the CLC socket */ 2556 if (unlikely(!smc->clcsock->ops->getsockopt)) { 2557 mutex_unlock(&smc->clcsock_release_lock); 2558 return -EOPNOTSUPP; 2559 } 2560 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2561 optval, optlen); 2562 mutex_unlock(&smc->clcsock_release_lock); 2563 return rc; 2564 } 2565 2566 static int smc_ioctl(struct socket *sock, unsigned int cmd, 2567 unsigned long arg) 2568 { 2569 union smc_host_cursor cons, urg; 2570 struct smc_connection *conn; 2571 struct smc_sock *smc; 2572 int answ; 2573 2574 smc = smc_sk(sock->sk); 2575 conn = &smc->conn; 2576 lock_sock(&smc->sk); 2577 if (smc->use_fallback) { 2578 if (!smc->clcsock) { 2579 release_sock(&smc->sk); 2580 return -EBADF; 2581 } 2582 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2583 release_sock(&smc->sk); 2584 return answ; 2585 } 2586 switch (cmd) { 2587 case SIOCINQ: /* same as FIONREAD */ 2588 if (smc->sk.sk_state == SMC_LISTEN) { 2589 release_sock(&smc->sk); 2590 return -EINVAL; 2591 } 2592 if (smc->sk.sk_state == SMC_INIT || 2593 smc->sk.sk_state == SMC_CLOSED) 2594 answ = 0; 2595 else 2596 answ = atomic_read(&smc->conn.bytes_to_rcv); 2597 break; 2598 case SIOCOUTQ: 2599 /* output queue size (not send + not acked) */ 2600 if (smc->sk.sk_state == SMC_LISTEN) { 2601 release_sock(&smc->sk); 2602 return -EINVAL; 2603 } 2604 if (smc->sk.sk_state == SMC_INIT || 2605 smc->sk.sk_state == SMC_CLOSED) 2606 answ = 0; 2607 else 2608 answ = smc->conn.sndbuf_desc->len - 2609 atomic_read(&smc->conn.sndbuf_space); 2610 break; 2611 case SIOCOUTQNSD: 2612 /* output queue size (not send only) */ 2613 if (smc->sk.sk_state == SMC_LISTEN) { 2614 release_sock(&smc->sk); 2615 return -EINVAL; 2616 } 2617 if (smc->sk.sk_state == SMC_INIT || 2618 smc->sk.sk_state == SMC_CLOSED) 2619 answ = 0; 2620 else 2621 answ = smc_tx_prepared_sends(&smc->conn); 2622 break; 2623 case SIOCATMARK: 2624 if (smc->sk.sk_state == SMC_LISTEN) { 2625 release_sock(&smc->sk); 2626 return -EINVAL; 2627 } 2628 if (smc->sk.sk_state == SMC_INIT || 2629 smc->sk.sk_state == SMC_CLOSED) { 2630 answ = 0; 2631 } else { 2632 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2633 smc_curs_copy(&urg, &conn->urg_curs, conn); 2634 answ = smc_curs_diff(conn->rmb_desc->len, 2635 &cons, &urg) == 1; 2636 } 2637 break; 2638 default: 2639 release_sock(&smc->sk); 2640 return -ENOIOCTLCMD; 2641 } 2642 release_sock(&smc->sk); 2643 2644 return put_user(answ, (int __user *)arg); 2645 } 2646 2647 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2648 int offset, size_t size, int flags) 2649 { 2650 struct sock *sk = sock->sk; 2651 struct smc_sock *smc; 2652 int rc = -EPIPE; 2653 2654 smc = smc_sk(sk); 2655 lock_sock(sk); 2656 if (sk->sk_state != SMC_ACTIVE) { 2657 release_sock(sk); 2658 goto out; 2659 } 2660 release_sock(sk); 2661 if (smc->use_fallback) { 2662 rc = kernel_sendpage(smc->clcsock, page, offset, 2663 size, flags); 2664 } else { 2665 SMC_STAT_INC(smc, sendpage_cnt); 2666 rc = sock_no_sendpage(sock, page, offset, size, flags); 2667 } 2668 2669 out: 2670 return rc; 2671 } 2672 2673 /* Map the affected portions of the rmbe into an spd, note the number of bytes 2674 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2675 * updates till whenever a respective page has been fully processed. 2676 * Note that subsequent recv() calls have to wait till all splice() processing 2677 * completed. 2678 */ 2679 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2680 struct pipe_inode_info *pipe, size_t len, 2681 unsigned int flags) 2682 { 2683 struct sock *sk = sock->sk; 2684 struct smc_sock *smc; 2685 int rc = -ENOTCONN; 2686 2687 smc = smc_sk(sk); 2688 lock_sock(sk); 2689 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2690 /* socket was connected before, no more data to read */ 2691 rc = 0; 2692 goto out; 2693 } 2694 if (sk->sk_state == SMC_INIT || 2695 sk->sk_state == SMC_LISTEN || 2696 sk->sk_state == SMC_CLOSED) 2697 goto out; 2698 2699 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2700 rc = 0; 2701 goto out; 2702 } 2703 2704 if (smc->use_fallback) { 2705 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2706 pipe, len, flags); 2707 } else { 2708 if (*ppos) { 2709 rc = -ESPIPE; 2710 goto out; 2711 } 2712 if (flags & SPLICE_F_NONBLOCK) 2713 flags = MSG_DONTWAIT; 2714 else 2715 flags = 0; 2716 SMC_STAT_INC(smc, splice_cnt); 2717 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2718 } 2719 out: 2720 release_sock(sk); 2721 2722 return rc; 2723 } 2724 2725 /* must look like tcp */ 2726 static const struct proto_ops smc_sock_ops = { 2727 .family = PF_SMC, 2728 .owner = THIS_MODULE, 2729 .release = smc_release, 2730 .bind = smc_bind, 2731 .connect = smc_connect, 2732 .socketpair = sock_no_socketpair, 2733 .accept = smc_accept, 2734 .getname = smc_getname, 2735 .poll = smc_poll, 2736 .ioctl = smc_ioctl, 2737 .listen = smc_listen, 2738 .shutdown = smc_shutdown, 2739 .setsockopt = smc_setsockopt, 2740 .getsockopt = smc_getsockopt, 2741 .sendmsg = smc_sendmsg, 2742 .recvmsg = smc_recvmsg, 2743 .mmap = sock_no_mmap, 2744 .sendpage = smc_sendpage, 2745 .splice_read = smc_splice_read, 2746 }; 2747 2748 static int __smc_create(struct net *net, struct socket *sock, int protocol, 2749 int kern, struct socket *clcsock) 2750 { 2751 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2752 struct smc_sock *smc; 2753 struct sock *sk; 2754 int rc; 2755 2756 rc = -ESOCKTNOSUPPORT; 2757 if (sock->type != SOCK_STREAM) 2758 goto out; 2759 2760 rc = -EPROTONOSUPPORT; 2761 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2762 goto out; 2763 2764 rc = -ENOBUFS; 2765 sock->ops = &smc_sock_ops; 2766 sk = smc_sock_alloc(net, sock, protocol); 2767 if (!sk) 2768 goto out; 2769 2770 /* create internal TCP socket for CLC handshake and fallback */ 2771 smc = smc_sk(sk); 2772 smc->use_fallback = false; /* assume rdma capability first */ 2773 smc->fallback_rsn = 0; 2774 2775 rc = 0; 2776 if (!clcsock) { 2777 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2778 &smc->clcsock); 2779 if (rc) { 2780 sk_common_release(sk); 2781 goto out; 2782 } 2783 } else { 2784 smc->clcsock = clcsock; 2785 } 2786 2787 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2788 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2789 2790 out: 2791 return rc; 2792 } 2793 2794 static int smc_create(struct net *net, struct socket *sock, int protocol, 2795 int kern) 2796 { 2797 return __smc_create(net, sock, protocol, kern, NULL); 2798 } 2799 2800 static const struct net_proto_family smc_sock_family_ops = { 2801 .family = PF_SMC, 2802 .owner = THIS_MODULE, 2803 .create = smc_create, 2804 }; 2805 2806 static int smc_ulp_init(struct sock *sk) 2807 { 2808 struct socket *tcp = sk->sk_socket; 2809 struct net *net = sock_net(sk); 2810 struct socket *smcsock; 2811 int protocol, ret; 2812 2813 /* only TCP can be replaced */ 2814 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP || 2815 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) 2816 return -ESOCKTNOSUPPORT; 2817 /* don't handle wq now */ 2818 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list) 2819 return -ENOTCONN; 2820 2821 if (sk->sk_family == AF_INET) 2822 protocol = SMCPROTO_SMC; 2823 else 2824 protocol = SMCPROTO_SMC6; 2825 2826 smcsock = sock_alloc(); 2827 if (!smcsock) 2828 return -ENFILE; 2829 2830 smcsock->type = SOCK_STREAM; 2831 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */ 2832 ret = __smc_create(net, smcsock, protocol, 1, tcp); 2833 if (ret) { 2834 sock_release(smcsock); /* module_put() which ops won't be NULL */ 2835 return ret; 2836 } 2837 2838 /* replace tcp socket to smc */ 2839 smcsock->file = tcp->file; 2840 smcsock->file->private_data = smcsock; 2841 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */ 2842 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */ 2843 tcp->file = NULL; 2844 2845 return ret; 2846 } 2847 2848 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk, 2849 const gfp_t priority) 2850 { 2851 struct inet_connection_sock *icsk = inet_csk(newsk); 2852 2853 /* don't inherit ulp ops to child when listen */ 2854 icsk->icsk_ulp_ops = NULL; 2855 } 2856 2857 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = { 2858 .name = "smc", 2859 .owner = THIS_MODULE, 2860 .init = smc_ulp_init, 2861 .clone = smc_ulp_clone, 2862 }; 2863 2864 unsigned int smc_net_id; 2865 2866 static __net_init int smc_net_init(struct net *net) 2867 { 2868 return smc_pnet_net_init(net); 2869 } 2870 2871 static void __net_exit smc_net_exit(struct net *net) 2872 { 2873 smc_pnet_net_exit(net); 2874 } 2875 2876 static __net_init int smc_net_stat_init(struct net *net) 2877 { 2878 return smc_stats_init(net); 2879 } 2880 2881 static void __net_exit smc_net_stat_exit(struct net *net) 2882 { 2883 smc_stats_exit(net); 2884 } 2885 2886 static struct pernet_operations smc_net_ops = { 2887 .init = smc_net_init, 2888 .exit = smc_net_exit, 2889 .id = &smc_net_id, 2890 .size = sizeof(struct smc_net), 2891 }; 2892 2893 static struct pernet_operations smc_net_stat_ops = { 2894 .init = smc_net_stat_init, 2895 .exit = smc_net_stat_exit, 2896 }; 2897 2898 static int __init smc_init(void) 2899 { 2900 int rc; 2901 2902 rc = register_pernet_subsys(&smc_net_ops); 2903 if (rc) 2904 return rc; 2905 2906 rc = register_pernet_subsys(&smc_net_stat_ops); 2907 if (rc) 2908 return rc; 2909 2910 smc_ism_init(); 2911 smc_clc_init(); 2912 2913 rc = smc_nl_init(); 2914 if (rc) 2915 goto out_pernet_subsys; 2916 2917 rc = smc_pnet_init(); 2918 if (rc) 2919 goto out_nl; 2920 2921 rc = -ENOMEM; 2922 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 2923 if (!smc_hs_wq) 2924 goto out_pnet; 2925 2926 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 2927 if (!smc_close_wq) 2928 goto out_alloc_hs_wq; 2929 2930 rc = smc_core_init(); 2931 if (rc) { 2932 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 2933 goto out_alloc_wqs; 2934 } 2935 2936 rc = smc_llc_init(); 2937 if (rc) { 2938 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 2939 goto out_core; 2940 } 2941 2942 rc = smc_cdc_init(); 2943 if (rc) { 2944 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 2945 goto out_core; 2946 } 2947 2948 rc = proto_register(&smc_proto, 1); 2949 if (rc) { 2950 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 2951 goto out_core; 2952 } 2953 2954 rc = proto_register(&smc_proto6, 1); 2955 if (rc) { 2956 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 2957 goto out_proto; 2958 } 2959 2960 rc = sock_register(&smc_sock_family_ops); 2961 if (rc) { 2962 pr_err("%s: sock_register fails with %d\n", __func__, rc); 2963 goto out_proto6; 2964 } 2965 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 2966 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 2967 2968 rc = smc_ib_register_client(); 2969 if (rc) { 2970 pr_err("%s: ib_register fails with %d\n", __func__, rc); 2971 goto out_sock; 2972 } 2973 2974 rc = tcp_register_ulp(&smc_ulp_ops); 2975 if (rc) { 2976 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc); 2977 goto out_sock; 2978 } 2979 2980 static_branch_enable(&tcp_have_smc); 2981 return 0; 2982 2983 out_sock: 2984 sock_unregister(PF_SMC); 2985 out_proto6: 2986 proto_unregister(&smc_proto6); 2987 out_proto: 2988 proto_unregister(&smc_proto); 2989 out_core: 2990 smc_core_exit(); 2991 out_alloc_wqs: 2992 destroy_workqueue(smc_close_wq); 2993 out_alloc_hs_wq: 2994 destroy_workqueue(smc_hs_wq); 2995 out_pnet: 2996 smc_pnet_exit(); 2997 out_nl: 2998 smc_nl_exit(); 2999 out_pernet_subsys: 3000 unregister_pernet_subsys(&smc_net_ops); 3001 3002 return rc; 3003 } 3004 3005 static void __exit smc_exit(void) 3006 { 3007 static_branch_disable(&tcp_have_smc); 3008 tcp_unregister_ulp(&smc_ulp_ops); 3009 sock_unregister(PF_SMC); 3010 smc_core_exit(); 3011 smc_ib_unregister_client(); 3012 destroy_workqueue(smc_close_wq); 3013 destroy_workqueue(smc_hs_wq); 3014 proto_unregister(&smc_proto6); 3015 proto_unregister(&smc_proto); 3016 smc_pnet_exit(); 3017 smc_nl_exit(); 3018 smc_clc_exit(); 3019 unregister_pernet_subsys(&smc_net_stat_ops); 3020 unregister_pernet_subsys(&smc_net_ops); 3021 rcu_barrier(); 3022 } 3023 3024 module_init(smc_init); 3025 module_exit(smc_exit); 3026 3027 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 3028 MODULE_DESCRIPTION("smc socket address family"); 3029 MODULE_LICENSE("GPL"); 3030 MODULE_ALIAS_NETPROTO(PF_SMC); 3031 MODULE_ALIAS_TCP_ULP("smc"); 3032