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 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 93 write_unlock_bh(&h->lock); 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 void 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 = sk_sleep(smc->clcsock->sk); 573 unsigned long flags; 574 575 smc->use_fallback = true; 576 smc->fallback_rsn = reason_code; 577 smc_stat_fallback(smc); 578 trace_smc_switch_to_fallback(smc, reason_code); 579 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 580 smc->clcsock->file = smc->sk.sk_socket->file; 581 smc->clcsock->file->private_data = smc->clcsock; 582 smc->clcsock->wq.fasync_list = 583 smc->sk.sk_socket->wq.fasync_list; 584 585 /* There may be some entries remaining in 586 * smc socket->wq, which should be removed 587 * to clcsocket->wq during the fallback. 588 */ 589 spin_lock_irqsave(&smc_wait->lock, flags); 590 spin_lock_nested(&clc_wait->lock, SINGLE_DEPTH_NESTING); 591 list_splice_init(&smc_wait->head, &clc_wait->head); 592 spin_unlock(&clc_wait->lock); 593 spin_unlock_irqrestore(&smc_wait->lock, flags); 594 } 595 } 596 597 /* fall back during connect */ 598 static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 599 { 600 smc_switch_to_fallback(smc, reason_code); 601 smc_copy_sock_settings_to_clc(smc); 602 smc->connect_nonblock = 0; 603 if (smc->sk.sk_state == SMC_INIT) 604 smc->sk.sk_state = SMC_ACTIVE; 605 return 0; 606 } 607 608 /* decline and fall back during connect */ 609 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 610 u8 version) 611 { 612 struct net *net = sock_net(&smc->sk); 613 int rc; 614 615 if (reason_code < 0) { /* error, fallback is not possible */ 616 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 617 if (smc->sk.sk_state == SMC_INIT) 618 sock_put(&smc->sk); /* passive closing */ 619 return reason_code; 620 } 621 if (reason_code != SMC_CLC_DECL_PEERDECL) { 622 rc = smc_clc_send_decline(smc, reason_code, version); 623 if (rc < 0) { 624 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt); 625 if (smc->sk.sk_state == SMC_INIT) 626 sock_put(&smc->sk); /* passive closing */ 627 return rc; 628 } 629 } 630 return smc_connect_fallback(smc, reason_code); 631 } 632 633 static void smc_conn_abort(struct smc_sock *smc, int local_first) 634 { 635 if (local_first) 636 smc_lgr_cleanup_early(&smc->conn); 637 else 638 smc_conn_free(&smc->conn); 639 } 640 641 /* check if there is a rdma device available for this connection. */ 642 /* called for connect and listen */ 643 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 644 { 645 /* PNET table look up: search active ib_device and port 646 * within same PNETID that also contains the ethernet device 647 * used for the internal TCP socket 648 */ 649 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 650 if (!ini->check_smcrv2 && !ini->ib_dev) 651 return SMC_CLC_DECL_NOSMCRDEV; 652 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2) 653 return SMC_CLC_DECL_NOSMCRDEV; 654 return 0; 655 } 656 657 /* check if there is an ISM device available for this connection. */ 658 /* called for connect and listen */ 659 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 660 { 661 /* Find ISM device with same PNETID as connecting interface */ 662 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 663 if (!ini->ism_dev[0]) 664 return SMC_CLC_DECL_NOSMCDDEV; 665 else 666 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 667 return 0; 668 } 669 670 /* is chid unique for the ism devices that are already determined? */ 671 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 672 int cnt) 673 { 674 int i = (!ini->ism_dev[0]) ? 1 : 0; 675 676 for (; i < cnt; i++) 677 if (ini->ism_chid[i] == chid) 678 return false; 679 return true; 680 } 681 682 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus 683 * PNETID matching net_device) 684 */ 685 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 686 struct smc_init_info *ini) 687 { 688 int rc = SMC_CLC_DECL_NOSMCDDEV; 689 struct smcd_dev *smcd; 690 int i = 1; 691 u16 chid; 692 693 if (smcd_indicated(ini->smc_type_v1)) 694 rc = 0; /* already initialized for V1 */ 695 mutex_lock(&smcd_dev_list.mutex); 696 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 697 if (smcd->going_away || smcd == ini->ism_dev[0]) 698 continue; 699 chid = smc_ism_get_chid(smcd); 700 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 701 continue; 702 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 703 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 704 ini->ism_dev[i] = smcd; 705 ini->ism_chid[i] = chid; 706 ini->is_smcd = true; 707 rc = 0; 708 i++; 709 if (i > SMC_MAX_ISM_DEVS) 710 break; 711 } 712 } 713 mutex_unlock(&smcd_dev_list.mutex); 714 ini->ism_offered_cnt = i - 1; 715 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 716 ini->smcd_version = 0; 717 718 return rc; 719 } 720 721 /* Check for VLAN ID and register it on ISM device just for CLC handshake */ 722 static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 723 struct smc_init_info *ini) 724 { 725 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 726 return SMC_CLC_DECL_ISMVLANERR; 727 return 0; 728 } 729 730 static int smc_find_proposal_devices(struct smc_sock *smc, 731 struct smc_init_info *ini) 732 { 733 int rc = 0; 734 735 /* check if there is an ism device available */ 736 if (!(ini->smcd_version & SMC_V1) || 737 smc_find_ism_device(smc, ini) || 738 smc_connect_ism_vlan_setup(smc, ini)) 739 ini->smcd_version &= ~SMC_V1; 740 /* else ISM V1 is supported for this connection */ 741 742 /* check if there is an rdma device available */ 743 if (!(ini->smcr_version & SMC_V1) || 744 smc_find_rdma_device(smc, ini)) 745 ini->smcr_version &= ~SMC_V1; 746 /* else RDMA is supported for this connection */ 747 748 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1, 749 ini->smcr_version & SMC_V1); 750 751 /* check if there is an ism v2 device available */ 752 if (!(ini->smcd_version & SMC_V2) || 753 !smc_ism_is_v2_capable() || 754 smc_find_ism_v2_device_clnt(smc, ini)) 755 ini->smcd_version &= ~SMC_V2; 756 757 /* check if there is an rdma v2 device available */ 758 ini->check_smcrv2 = true; 759 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr; 760 if (!(ini->smcr_version & SMC_V2) || 761 smc->clcsock->sk->sk_family != AF_INET || 762 !smc_clc_ueid_count() || 763 smc_find_rdma_device(smc, ini)) 764 ini->smcr_version &= ~SMC_V2; 765 ini->check_smcrv2 = false; 766 767 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2, 768 ini->smcr_version & SMC_V2); 769 770 /* if neither ISM nor RDMA are supported, fallback */ 771 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 772 rc = SMC_CLC_DECL_NOSMCDEV; 773 774 return rc; 775 } 776 777 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 778 * used, the VLAN ID will be registered again during the connection setup. 779 */ 780 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 781 struct smc_init_info *ini) 782 { 783 if (!smcd_indicated(ini->smc_type_v1)) 784 return 0; 785 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 786 return SMC_CLC_DECL_CNFERR; 787 return 0; 788 } 789 790 #define SMC_CLC_MAX_ACCEPT_LEN \ 791 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \ 792 sizeof(struct smc_clc_first_contact_ext) + \ 793 sizeof(struct smc_clc_msg_trail)) 794 795 /* CLC handshake during connect */ 796 static int smc_connect_clc(struct smc_sock *smc, 797 struct smc_clc_msg_accept_confirm_v2 *aclc2, 798 struct smc_init_info *ini) 799 { 800 int rc = 0; 801 802 /* do inband token exchange */ 803 rc = smc_clc_send_proposal(smc, ini); 804 if (rc) 805 return rc; 806 /* receive SMC Accept CLC message */ 807 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, 808 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 809 } 810 811 void smc_fill_gid_list(struct smc_link_group *lgr, 812 struct smc_gidlist *gidlist, 813 struct smc_ib_device *known_dev, u8 *known_gid) 814 { 815 struct smc_init_info *alt_ini = NULL; 816 817 memset(gidlist, 0, sizeof(*gidlist)); 818 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE); 819 820 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL); 821 if (!alt_ini) 822 goto out; 823 824 alt_ini->vlan_id = lgr->vlan_id; 825 alt_ini->check_smcrv2 = true; 826 alt_ini->smcrv2.saddr = lgr->saddr; 827 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev); 828 829 if (!alt_ini->smcrv2.ib_dev_v2) 830 goto out; 831 832 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2, 833 SMC_GID_SIZE); 834 835 out: 836 kfree(alt_ini); 837 } 838 839 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc, 840 struct smc_clc_msg_accept_confirm *aclc, 841 struct smc_init_info *ini) 842 { 843 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 844 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 845 struct smc_clc_first_contact_ext *fce = 846 (struct smc_clc_first_contact_ext *) 847 (((u8 *)clc_v2) + sizeof(*clc_v2)); 848 849 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1) 850 return 0; 851 852 if (fce->v2_direct) { 853 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN); 854 ini->smcrv2.uses_gateway = false; 855 } else { 856 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr, 857 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid), 858 ini->smcrv2.nexthop_mac, 859 &ini->smcrv2.uses_gateway)) 860 return SMC_CLC_DECL_NOROUTE; 861 if (!ini->smcrv2.uses_gateway) { 862 /* mismatch: peer claims indirect, but its direct */ 863 return SMC_CLC_DECL_NOINDIRECT; 864 } 865 } 866 return 0; 867 } 868 869 /* setup for RDMA connection of client */ 870 static int smc_connect_rdma(struct smc_sock *smc, 871 struct smc_clc_msg_accept_confirm *aclc, 872 struct smc_init_info *ini) 873 { 874 int i, reason_code = 0; 875 struct smc_link *link; 876 u8 *eid = NULL; 877 878 ini->is_smcd = false; 879 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 880 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 881 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN); 882 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE); 883 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN); 884 885 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini); 886 if (reason_code) 887 return reason_code; 888 889 mutex_lock(&smc_client_lgr_pending); 890 reason_code = smc_conn_create(smc, ini); 891 if (reason_code) { 892 mutex_unlock(&smc_client_lgr_pending); 893 return reason_code; 894 } 895 896 smc_conn_save_peer_info(smc, aclc); 897 898 if (ini->first_contact_local) { 899 link = smc->conn.lnk; 900 } else { 901 /* set link that was assigned by server */ 902 link = NULL; 903 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 904 struct smc_link *l = &smc->conn.lgr->lnk[i]; 905 906 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 907 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 908 SMC_GID_SIZE) && 909 (aclc->hdr.version > SMC_V1 || 910 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 911 sizeof(l->peer_mac)))) { 912 link = l; 913 break; 914 } 915 } 916 if (!link) { 917 reason_code = SMC_CLC_DECL_NOSRVLINK; 918 goto connect_abort; 919 } 920 smc_switch_link_and_count(&smc->conn, link); 921 } 922 923 /* create send buffer and rmb */ 924 if (smc_buf_create(smc, false)) { 925 reason_code = SMC_CLC_DECL_MEM; 926 goto connect_abort; 927 } 928 929 if (ini->first_contact_local) 930 smc_link_save_peer_info(link, aclc, ini); 931 932 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 933 reason_code = SMC_CLC_DECL_ERR_RTOK; 934 goto connect_abort; 935 } 936 937 smc_close_init(smc); 938 smc_rx_init(smc); 939 940 if (ini->first_contact_local) { 941 if (smc_ib_ready_link(link)) { 942 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 943 goto connect_abort; 944 } 945 } else { 946 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 947 reason_code = SMC_CLC_DECL_ERR_REGRMB; 948 goto connect_abort; 949 } 950 } 951 smc_rmb_sync_sg_for_device(&smc->conn); 952 953 if (aclc->hdr.version > SMC_V1) { 954 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 955 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 956 957 eid = clc_v2->r1.eid; 958 if (ini->first_contact_local) 959 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist, 960 link->smcibdev, link->gid); 961 } 962 963 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 964 aclc->hdr.version, eid, ini); 965 if (reason_code) 966 goto connect_abort; 967 968 smc_tx_init(smc); 969 970 if (ini->first_contact_local) { 971 /* QP confirmation over RoCE fabric */ 972 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 973 reason_code = smcr_clnt_conf_first_link(smc); 974 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 975 if (reason_code) 976 goto connect_abort; 977 } 978 mutex_unlock(&smc_client_lgr_pending); 979 980 smc_copy_sock_settings_to_clc(smc); 981 smc->connect_nonblock = 0; 982 if (smc->sk.sk_state == SMC_INIT) 983 smc->sk.sk_state = SMC_ACTIVE; 984 985 return 0; 986 connect_abort: 987 smc_conn_abort(smc, ini->first_contact_local); 988 mutex_unlock(&smc_client_lgr_pending); 989 smc->connect_nonblock = 0; 990 991 return reason_code; 992 } 993 994 /* The server has chosen one of the proposed ISM devices for the communication. 995 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 996 */ 997 static int 998 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 999 struct smc_init_info *ini) 1000 { 1001 int i; 1002 1003 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 1004 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) { 1005 ini->ism_selected = i; 1006 return 0; 1007 } 1008 } 1009 1010 return -EPROTO; 1011 } 1012 1013 /* setup for ISM connection of client */ 1014 static int smc_connect_ism(struct smc_sock *smc, 1015 struct smc_clc_msg_accept_confirm *aclc, 1016 struct smc_init_info *ini) 1017 { 1018 u8 *eid = NULL; 1019 int rc = 0; 1020 1021 ini->is_smcd = true; 1022 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 1023 1024 if (aclc->hdr.version == SMC_V2) { 1025 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 1026 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1027 1028 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 1029 if (rc) 1030 return rc; 1031 } 1032 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 1033 1034 /* there is only one lgr role for SMC-D; use server lock */ 1035 mutex_lock(&smc_server_lgr_pending); 1036 rc = smc_conn_create(smc, ini); 1037 if (rc) { 1038 mutex_unlock(&smc_server_lgr_pending); 1039 return rc; 1040 } 1041 1042 /* Create send and receive buffers */ 1043 rc = smc_buf_create(smc, true); 1044 if (rc) { 1045 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 1046 goto connect_abort; 1047 } 1048 1049 smc_conn_save_peer_info(smc, aclc); 1050 smc_close_init(smc); 1051 smc_rx_init(smc); 1052 smc_tx_init(smc); 1053 1054 if (aclc->hdr.version > SMC_V1) { 1055 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 1056 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 1057 1058 eid = clc_v2->d1.eid; 1059 } 1060 1061 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 1062 aclc->hdr.version, eid, NULL); 1063 if (rc) 1064 goto connect_abort; 1065 mutex_unlock(&smc_server_lgr_pending); 1066 1067 smc_copy_sock_settings_to_clc(smc); 1068 smc->connect_nonblock = 0; 1069 if (smc->sk.sk_state == SMC_INIT) 1070 smc->sk.sk_state = SMC_ACTIVE; 1071 1072 return 0; 1073 connect_abort: 1074 smc_conn_abort(smc, ini->first_contact_local); 1075 mutex_unlock(&smc_server_lgr_pending); 1076 smc->connect_nonblock = 0; 1077 1078 return rc; 1079 } 1080 1081 /* check if received accept type and version matches a proposed one */ 1082 static int smc_connect_check_aclc(struct smc_init_info *ini, 1083 struct smc_clc_msg_accept_confirm *aclc) 1084 { 1085 if (aclc->hdr.typev1 != SMC_TYPE_R && 1086 aclc->hdr.typev1 != SMC_TYPE_D) 1087 return SMC_CLC_DECL_MODEUNSUPP; 1088 1089 if (aclc->hdr.version >= SMC_V2) { 1090 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1091 !smcr_indicated(ini->smc_type_v2)) || 1092 (aclc->hdr.typev1 == SMC_TYPE_D && 1093 !smcd_indicated(ini->smc_type_v2))) 1094 return SMC_CLC_DECL_MODEUNSUPP; 1095 } else { 1096 if ((aclc->hdr.typev1 == SMC_TYPE_R && 1097 !smcr_indicated(ini->smc_type_v1)) || 1098 (aclc->hdr.typev1 == SMC_TYPE_D && 1099 !smcd_indicated(ini->smc_type_v1))) 1100 return SMC_CLC_DECL_MODEUNSUPP; 1101 } 1102 1103 return 0; 1104 } 1105 1106 /* perform steps before actually connecting */ 1107 static int __smc_connect(struct smc_sock *smc) 1108 { 1109 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1; 1110 struct smc_clc_msg_accept_confirm_v2 *aclc2; 1111 struct smc_clc_msg_accept_confirm *aclc; 1112 struct smc_init_info *ini = NULL; 1113 u8 *buf = NULL; 1114 int rc = 0; 1115 1116 if (smc->use_fallback) 1117 return smc_connect_fallback(smc, smc->fallback_rsn); 1118 1119 /* if peer has not signalled SMC-capability, fall back */ 1120 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 1121 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 1122 1123 /* IPSec connections opt out of SMC optimizations */ 1124 if (using_ipsec(smc)) 1125 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 1126 version); 1127 1128 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1129 if (!ini) 1130 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 1131 version); 1132 1133 ini->smcd_version = SMC_V1 | SMC_V2; 1134 ini->smcr_version = SMC_V1 | SMC_V2; 1135 ini->smc_type_v1 = SMC_TYPE_B; 1136 ini->smc_type_v2 = SMC_TYPE_B; 1137 1138 /* get vlan id from IP device */ 1139 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 1140 ini->smcd_version &= ~SMC_V1; 1141 ini->smcr_version = 0; 1142 ini->smc_type_v1 = SMC_TYPE_N; 1143 if (!ini->smcd_version) { 1144 rc = SMC_CLC_DECL_GETVLANERR; 1145 goto fallback; 1146 } 1147 } 1148 1149 rc = smc_find_proposal_devices(smc, ini); 1150 if (rc) 1151 goto fallback; 1152 1153 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 1154 if (!buf) { 1155 rc = SMC_CLC_DECL_MEM; 1156 goto fallback; 1157 } 1158 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1159 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1160 1161 /* perform CLC handshake */ 1162 rc = smc_connect_clc(smc, aclc2, ini); 1163 if (rc) 1164 goto vlan_cleanup; 1165 1166 /* check if smc modes and versions of CLC proposal and accept match */ 1167 rc = smc_connect_check_aclc(ini, aclc); 1168 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1169 if (rc) 1170 goto vlan_cleanup; 1171 1172 /* depending on previous steps, connect using rdma or ism */ 1173 if (aclc->hdr.typev1 == SMC_TYPE_R) { 1174 ini->smcr_version = version; 1175 rc = smc_connect_rdma(smc, aclc, ini); 1176 } else if (aclc->hdr.typev1 == SMC_TYPE_D) { 1177 ini->smcd_version = version; 1178 rc = smc_connect_ism(smc, aclc, ini); 1179 } 1180 if (rc) 1181 goto vlan_cleanup; 1182 1183 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc); 1184 smc_connect_ism_vlan_cleanup(smc, ini); 1185 kfree(buf); 1186 kfree(ini); 1187 return 0; 1188 1189 vlan_cleanup: 1190 smc_connect_ism_vlan_cleanup(smc, ini); 1191 kfree(buf); 1192 fallback: 1193 kfree(ini); 1194 return smc_connect_decline_fallback(smc, rc, version); 1195 } 1196 1197 static void smc_connect_work(struct work_struct *work) 1198 { 1199 struct smc_sock *smc = container_of(work, struct smc_sock, 1200 connect_work); 1201 long timeo = smc->sk.sk_sndtimeo; 1202 int rc = 0; 1203 1204 if (!timeo) 1205 timeo = MAX_SCHEDULE_TIMEOUT; 1206 lock_sock(smc->clcsock->sk); 1207 if (smc->clcsock->sk->sk_err) { 1208 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1209 } else if ((1 << smc->clcsock->sk->sk_state) & 1210 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1211 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1212 if ((rc == -EPIPE) && 1213 ((1 << smc->clcsock->sk->sk_state) & 1214 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1215 rc = 0; 1216 } 1217 release_sock(smc->clcsock->sk); 1218 lock_sock(&smc->sk); 1219 if (rc != 0 || smc->sk.sk_err) { 1220 smc->sk.sk_state = SMC_CLOSED; 1221 if (rc == -EPIPE || rc == -EAGAIN) 1222 smc->sk.sk_err = EPIPE; 1223 else if (signal_pending(current)) 1224 smc->sk.sk_err = -sock_intr_errno(timeo); 1225 sock_put(&smc->sk); /* passive closing */ 1226 goto out; 1227 } 1228 1229 rc = __smc_connect(smc); 1230 if (rc < 0) 1231 smc->sk.sk_err = -rc; 1232 1233 out: 1234 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1235 if (smc->sk.sk_err) { 1236 smc->sk.sk_state_change(&smc->sk); 1237 } else { /* allow polling before and after fallback decision */ 1238 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1239 smc->sk.sk_write_space(&smc->sk); 1240 } 1241 } 1242 release_sock(&smc->sk); 1243 } 1244 1245 static int smc_connect(struct socket *sock, struct sockaddr *addr, 1246 int alen, int flags) 1247 { 1248 struct sock *sk = sock->sk; 1249 struct smc_sock *smc; 1250 int rc = -EINVAL; 1251 1252 smc = smc_sk(sk); 1253 1254 /* separate smc parameter checking to be safe */ 1255 if (alen < sizeof(addr->sa_family)) 1256 goto out_err; 1257 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1258 goto out_err; 1259 1260 lock_sock(sk); 1261 switch (sk->sk_state) { 1262 default: 1263 goto out; 1264 case SMC_ACTIVE: 1265 rc = -EISCONN; 1266 goto out; 1267 case SMC_INIT: 1268 break; 1269 } 1270 1271 smc_copy_sock_settings_to_clc(smc); 1272 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1273 if (smc->connect_nonblock) { 1274 rc = -EALREADY; 1275 goto out; 1276 } 1277 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1278 if (rc && rc != -EINPROGRESS) 1279 goto out; 1280 1281 sock_hold(&smc->sk); /* sock put in passive closing */ 1282 if (smc->use_fallback) 1283 goto out; 1284 if (flags & O_NONBLOCK) { 1285 if (queue_work(smc_hs_wq, &smc->connect_work)) 1286 smc->connect_nonblock = 1; 1287 rc = -EINPROGRESS; 1288 } else { 1289 rc = __smc_connect(smc); 1290 if (rc < 0) 1291 goto out; 1292 else 1293 rc = 0; /* success cases including fallback */ 1294 } 1295 1296 out: 1297 release_sock(sk); 1298 out_err: 1299 return rc; 1300 } 1301 1302 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1303 { 1304 struct socket *new_clcsock = NULL; 1305 struct sock *lsk = &lsmc->sk; 1306 struct sock *new_sk; 1307 int rc = -EINVAL; 1308 1309 release_sock(lsk); 1310 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1311 if (!new_sk) { 1312 rc = -ENOMEM; 1313 lsk->sk_err = ENOMEM; 1314 *new_smc = NULL; 1315 lock_sock(lsk); 1316 goto out; 1317 } 1318 *new_smc = smc_sk(new_sk); 1319 1320 mutex_lock(&lsmc->clcsock_release_lock); 1321 if (lsmc->clcsock) 1322 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1323 mutex_unlock(&lsmc->clcsock_release_lock); 1324 lock_sock(lsk); 1325 if (rc < 0 && rc != -EAGAIN) 1326 lsk->sk_err = -rc; 1327 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1328 new_sk->sk_prot->unhash(new_sk); 1329 if (new_clcsock) 1330 sock_release(new_clcsock); 1331 new_sk->sk_state = SMC_CLOSED; 1332 sock_set_flag(new_sk, SOCK_DEAD); 1333 sock_put(new_sk); /* final */ 1334 *new_smc = NULL; 1335 goto out; 1336 } 1337 1338 /* new clcsock has inherited the smc listen-specific sk_data_ready 1339 * function; switch it back to the original sk_data_ready function 1340 */ 1341 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1342 (*new_smc)->clcsock = new_clcsock; 1343 out: 1344 return rc; 1345 } 1346 1347 /* add a just created sock to the accept queue of the listen sock as 1348 * candidate for a following socket accept call from user space 1349 */ 1350 static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1351 { 1352 struct smc_sock *par = smc_sk(parent); 1353 1354 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1355 spin_lock(&par->accept_q_lock); 1356 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1357 spin_unlock(&par->accept_q_lock); 1358 sk_acceptq_added(parent); 1359 } 1360 1361 /* remove a socket from the accept queue of its parental listening socket */ 1362 static void smc_accept_unlink(struct sock *sk) 1363 { 1364 struct smc_sock *par = smc_sk(sk)->listen_smc; 1365 1366 spin_lock(&par->accept_q_lock); 1367 list_del_init(&smc_sk(sk)->accept_q); 1368 spin_unlock(&par->accept_q_lock); 1369 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1370 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1371 } 1372 1373 /* remove a sock from the accept queue to bind it to a new socket created 1374 * for a socket accept call from user space 1375 */ 1376 struct sock *smc_accept_dequeue(struct sock *parent, 1377 struct socket *new_sock) 1378 { 1379 struct smc_sock *isk, *n; 1380 struct sock *new_sk; 1381 1382 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1383 new_sk = (struct sock *)isk; 1384 1385 smc_accept_unlink(new_sk); 1386 if (new_sk->sk_state == SMC_CLOSED) { 1387 new_sk->sk_prot->unhash(new_sk); 1388 if (isk->clcsock) { 1389 sock_release(isk->clcsock); 1390 isk->clcsock = NULL; 1391 } 1392 sock_put(new_sk); /* final */ 1393 continue; 1394 } 1395 if (new_sock) { 1396 sock_graft(new_sk, new_sock); 1397 if (isk->use_fallback) { 1398 smc_sk(new_sk)->clcsock->file = new_sock->file; 1399 isk->clcsock->file->private_data = isk->clcsock; 1400 } 1401 } 1402 return new_sk; 1403 } 1404 return NULL; 1405 } 1406 1407 /* clean up for a created but never accepted sock */ 1408 void smc_close_non_accepted(struct sock *sk) 1409 { 1410 struct smc_sock *smc = smc_sk(sk); 1411 1412 sock_hold(sk); /* sock_put below */ 1413 lock_sock(sk); 1414 if (!sk->sk_lingertime) 1415 /* wait for peer closing */ 1416 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1417 __smc_release(smc); 1418 release_sock(sk); 1419 sock_put(sk); /* sock_hold above */ 1420 sock_put(sk); /* final sock_put */ 1421 } 1422 1423 static int smcr_serv_conf_first_link(struct smc_sock *smc) 1424 { 1425 struct smc_link *link = smc->conn.lnk; 1426 struct smc_llc_qentry *qentry; 1427 int rc; 1428 1429 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1430 return SMC_CLC_DECL_ERR_REGRMB; 1431 1432 /* send CONFIRM LINK request to client over the RoCE fabric */ 1433 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1434 if (rc < 0) 1435 return SMC_CLC_DECL_TIMEOUT_CL; 1436 1437 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1438 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1439 SMC_LLC_CONFIRM_LINK); 1440 if (!qentry) { 1441 struct smc_clc_msg_decline dclc; 1442 1443 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1444 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1445 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1446 } 1447 smc_llc_save_peer_uid(qentry); 1448 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1449 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1450 if (rc) 1451 return SMC_CLC_DECL_RMBE_EC; 1452 1453 /* confirm_rkey is implicit on 1st contact */ 1454 smc->conn.rmb_desc->is_conf_rkey = true; 1455 1456 smc_llc_link_active(link); 1457 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1458 1459 /* initial contact - try to establish second link */ 1460 smc_llc_srv_add_link(link, NULL); 1461 return 0; 1462 } 1463 1464 /* listen worker: finish */ 1465 static void smc_listen_out(struct smc_sock *new_smc) 1466 { 1467 struct smc_sock *lsmc = new_smc->listen_smc; 1468 struct sock *newsmcsk = &new_smc->sk; 1469 1470 if (lsmc->sk.sk_state == SMC_LISTEN) { 1471 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1472 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1473 release_sock(&lsmc->sk); 1474 } else { /* no longer listening */ 1475 smc_close_non_accepted(newsmcsk); 1476 } 1477 1478 /* Wake up accept */ 1479 lsmc->sk.sk_data_ready(&lsmc->sk); 1480 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1481 } 1482 1483 /* listen worker: finish in state connected */ 1484 static void smc_listen_out_connected(struct smc_sock *new_smc) 1485 { 1486 struct sock *newsmcsk = &new_smc->sk; 1487 1488 sk_refcnt_debug_inc(newsmcsk); 1489 if (newsmcsk->sk_state == SMC_INIT) 1490 newsmcsk->sk_state = SMC_ACTIVE; 1491 1492 smc_listen_out(new_smc); 1493 } 1494 1495 /* listen worker: finish in error state */ 1496 static void smc_listen_out_err(struct smc_sock *new_smc) 1497 { 1498 struct sock *newsmcsk = &new_smc->sk; 1499 struct net *net = sock_net(newsmcsk); 1500 1501 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); 1502 if (newsmcsk->sk_state == SMC_INIT) 1503 sock_put(&new_smc->sk); /* passive closing */ 1504 newsmcsk->sk_state = SMC_CLOSED; 1505 1506 smc_listen_out(new_smc); 1507 } 1508 1509 /* listen worker: decline and fall back if possible */ 1510 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1511 int local_first, u8 version) 1512 { 1513 /* RDMA setup failed, switch back to TCP */ 1514 smc_conn_abort(new_smc, local_first); 1515 if (reason_code < 0) { /* error, no fallback possible */ 1516 smc_listen_out_err(new_smc); 1517 return; 1518 } 1519 smc_switch_to_fallback(new_smc, reason_code); 1520 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1521 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1522 smc_listen_out_err(new_smc); 1523 return; 1524 } 1525 } 1526 smc_listen_out_connected(new_smc); 1527 } 1528 1529 /* listen worker: version checking */ 1530 static int smc_listen_v2_check(struct smc_sock *new_smc, 1531 struct smc_clc_msg_proposal *pclc, 1532 struct smc_init_info *ini) 1533 { 1534 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1535 struct smc_clc_v2_extension *pclc_v2_ext; 1536 int rc = SMC_CLC_DECL_PEERNOSMC; 1537 1538 ini->smc_type_v1 = pclc->hdr.typev1; 1539 ini->smc_type_v2 = pclc->hdr.typev2; 1540 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1541 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0; 1542 if (pclc->hdr.version > SMC_V1) { 1543 if (smcd_indicated(ini->smc_type_v2)) 1544 ini->smcd_version |= SMC_V2; 1545 if (smcr_indicated(ini->smc_type_v2)) 1546 ini->smcr_version |= SMC_V2; 1547 } 1548 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) { 1549 rc = SMC_CLC_DECL_PEERNOSMC; 1550 goto out; 1551 } 1552 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1553 if (!pclc_v2_ext) { 1554 ini->smcd_version &= ~SMC_V2; 1555 ini->smcr_version &= ~SMC_V2; 1556 rc = SMC_CLC_DECL_NOV2EXT; 1557 goto out; 1558 } 1559 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1560 if (ini->smcd_version & SMC_V2) { 1561 if (!smc_ism_is_v2_capable()) { 1562 ini->smcd_version &= ~SMC_V2; 1563 rc = SMC_CLC_DECL_NOISM2SUPP; 1564 } else if (!pclc_smcd_v2_ext) { 1565 ini->smcd_version &= ~SMC_V2; 1566 rc = SMC_CLC_DECL_NOV2DEXT; 1567 } else if (!pclc_v2_ext->hdr.eid_cnt && 1568 !pclc_v2_ext->hdr.flag.seid) { 1569 ini->smcd_version &= ~SMC_V2; 1570 rc = SMC_CLC_DECL_NOUEID; 1571 } 1572 } 1573 if (ini->smcr_version & SMC_V2) { 1574 if (!pclc_v2_ext->hdr.eid_cnt) { 1575 ini->smcr_version &= ~SMC_V2; 1576 rc = SMC_CLC_DECL_NOUEID; 1577 } 1578 } 1579 1580 out: 1581 if (!ini->smcd_version && !ini->smcr_version) 1582 return rc; 1583 1584 return 0; 1585 } 1586 1587 /* listen worker: check prefixes */ 1588 static int smc_listen_prfx_check(struct smc_sock *new_smc, 1589 struct smc_clc_msg_proposal *pclc) 1590 { 1591 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1592 struct socket *newclcsock = new_smc->clcsock; 1593 1594 if (pclc->hdr.typev1 == SMC_TYPE_N) 1595 return 0; 1596 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1597 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1598 return SMC_CLC_DECL_DIFFPREFIX; 1599 1600 return 0; 1601 } 1602 1603 /* listen worker: initialize connection and buffers */ 1604 static int smc_listen_rdma_init(struct smc_sock *new_smc, 1605 struct smc_init_info *ini) 1606 { 1607 int rc; 1608 1609 /* allocate connection / link group */ 1610 rc = smc_conn_create(new_smc, ini); 1611 if (rc) 1612 return rc; 1613 1614 /* create send buffer and rmb */ 1615 if (smc_buf_create(new_smc, false)) 1616 return SMC_CLC_DECL_MEM; 1617 1618 return 0; 1619 } 1620 1621 /* listen worker: initialize connection and buffers for SMC-D */ 1622 static int smc_listen_ism_init(struct smc_sock *new_smc, 1623 struct smc_init_info *ini) 1624 { 1625 int rc; 1626 1627 rc = smc_conn_create(new_smc, ini); 1628 if (rc) 1629 return rc; 1630 1631 /* Create send and receive buffers */ 1632 rc = smc_buf_create(new_smc, true); 1633 if (rc) { 1634 smc_conn_abort(new_smc, ini->first_contact_local); 1635 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1636 SMC_CLC_DECL_MEM; 1637 } 1638 1639 return 0; 1640 } 1641 1642 static bool smc_is_already_selected(struct smcd_dev *smcd, 1643 struct smc_init_info *ini, 1644 int matches) 1645 { 1646 int i; 1647 1648 for (i = 0; i < matches; i++) 1649 if (smcd == ini->ism_dev[i]) 1650 return true; 1651 1652 return false; 1653 } 1654 1655 /* check for ISM devices matching proposed ISM devices */ 1656 static void smc_check_ism_v2_match(struct smc_init_info *ini, 1657 u16 proposed_chid, u64 proposed_gid, 1658 unsigned int *matches) 1659 { 1660 struct smcd_dev *smcd; 1661 1662 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1663 if (smcd->going_away) 1664 continue; 1665 if (smc_is_already_selected(smcd, ini, *matches)) 1666 continue; 1667 if (smc_ism_get_chid(smcd) == proposed_chid && 1668 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1669 ini->ism_peer_gid[*matches] = proposed_gid; 1670 ini->ism_dev[*matches] = smcd; 1671 (*matches)++; 1672 break; 1673 } 1674 } 1675 } 1676 1677 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini) 1678 { 1679 if (!ini->rc) 1680 ini->rc = rc; 1681 } 1682 1683 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1684 struct smc_clc_msg_proposal *pclc, 1685 struct smc_init_info *ini) 1686 { 1687 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1688 struct smc_clc_v2_extension *smc_v2_ext; 1689 struct smc_clc_msg_smcd *pclc_smcd; 1690 unsigned int matches = 0; 1691 u8 smcd_version; 1692 u8 *eid = NULL; 1693 int i, rc; 1694 1695 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1696 goto not_found; 1697 1698 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1699 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1700 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1701 1702 mutex_lock(&smcd_dev_list.mutex); 1703 if (pclc_smcd->ism.chid) 1704 /* check for ISM device matching proposed native ISM device */ 1705 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1706 ntohll(pclc_smcd->ism.gid), &matches); 1707 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1708 /* check for ISM devices matching proposed non-native ISM 1709 * devices 1710 */ 1711 smc_check_ism_v2_match(ini, 1712 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1713 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1714 &matches); 1715 } 1716 mutex_unlock(&smcd_dev_list.mutex); 1717 1718 if (!ini->ism_dev[0]) { 1719 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini); 1720 goto not_found; 1721 } 1722 1723 smc_ism_get_system_eid(&eid); 1724 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, 1725 smcd_v2_ext->system_eid, eid)) 1726 goto not_found; 1727 1728 /* separate - outside the smcd_dev_list.lock */ 1729 smcd_version = ini->smcd_version; 1730 for (i = 0; i < matches; i++) { 1731 ini->smcd_version = SMC_V2; 1732 ini->is_smcd = true; 1733 ini->ism_selected = i; 1734 rc = smc_listen_ism_init(new_smc, ini); 1735 if (rc) { 1736 smc_find_ism_store_rc(rc, ini); 1737 /* try next active ISM device */ 1738 continue; 1739 } 1740 return; /* matching and usable V2 ISM device found */ 1741 } 1742 /* no V2 ISM device could be initialized */ 1743 ini->smcd_version = smcd_version; /* restore original value */ 1744 ini->negotiated_eid[0] = 0; 1745 1746 not_found: 1747 ini->smcd_version &= ~SMC_V2; 1748 ini->ism_dev[0] = NULL; 1749 ini->is_smcd = false; 1750 } 1751 1752 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1753 struct smc_clc_msg_proposal *pclc, 1754 struct smc_init_info *ini) 1755 { 1756 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1757 int rc = 0; 1758 1759 /* check if ISM V1 is available */ 1760 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1761 goto not_found; 1762 ini->is_smcd = true; /* prepare ISM check */ 1763 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1764 rc = smc_find_ism_device(new_smc, ini); 1765 if (rc) 1766 goto not_found; 1767 ini->ism_selected = 0; 1768 rc = smc_listen_ism_init(new_smc, ini); 1769 if (!rc) 1770 return; /* V1 ISM device found */ 1771 1772 not_found: 1773 smc_find_ism_store_rc(rc, ini); 1774 ini->smcd_version &= ~SMC_V1; 1775 ini->ism_dev[0] = NULL; 1776 ini->is_smcd = false; 1777 } 1778 1779 /* listen worker: register buffers */ 1780 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1781 { 1782 struct smc_connection *conn = &new_smc->conn; 1783 1784 if (!local_first) { 1785 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1786 return SMC_CLC_DECL_ERR_REGRMB; 1787 } 1788 smc_rmb_sync_sg_for_device(&new_smc->conn); 1789 1790 return 0; 1791 } 1792 1793 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc, 1794 struct smc_clc_msg_proposal *pclc, 1795 struct smc_init_info *ini) 1796 { 1797 struct smc_clc_v2_extension *smc_v2_ext; 1798 u8 smcr_version; 1799 int rc; 1800 1801 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2)) 1802 goto not_found; 1803 1804 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1805 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL)) 1806 goto not_found; 1807 1808 /* prepare RDMA check */ 1809 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1810 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE); 1811 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1812 ini->check_smcrv2 = true; 1813 ini->smcrv2.clc_sk = new_smc->clcsock->sk; 1814 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr; 1815 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce); 1816 rc = smc_find_rdma_device(new_smc, ini); 1817 if (rc) { 1818 smc_find_ism_store_rc(rc, ini); 1819 goto not_found; 1820 } 1821 if (!ini->smcrv2.uses_gateway) 1822 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN); 1823 1824 smcr_version = ini->smcr_version; 1825 ini->smcr_version = SMC_V2; 1826 rc = smc_listen_rdma_init(new_smc, ini); 1827 if (!rc) 1828 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1829 if (!rc) 1830 return; 1831 ini->smcr_version = smcr_version; 1832 smc_find_ism_store_rc(rc, ini); 1833 1834 not_found: 1835 ini->smcr_version &= ~SMC_V2; 1836 ini->check_smcrv2 = false; 1837 } 1838 1839 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1840 struct smc_clc_msg_proposal *pclc, 1841 struct smc_init_info *ini) 1842 { 1843 int rc; 1844 1845 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1)) 1846 return SMC_CLC_DECL_NOSMCDEV; 1847 1848 /* prepare RDMA check */ 1849 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN); 1850 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE); 1851 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN); 1852 rc = smc_find_rdma_device(new_smc, ini); 1853 if (rc) { 1854 /* no RDMA device found */ 1855 return SMC_CLC_DECL_NOSMCDEV; 1856 } 1857 rc = smc_listen_rdma_init(new_smc, ini); 1858 if (rc) 1859 return rc; 1860 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1861 } 1862 1863 /* determine the local device matching to proposal */ 1864 static int smc_listen_find_device(struct smc_sock *new_smc, 1865 struct smc_clc_msg_proposal *pclc, 1866 struct smc_init_info *ini) 1867 { 1868 int prfx_rc; 1869 1870 /* check for ISM device matching V2 proposed device */ 1871 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 1872 if (ini->ism_dev[0]) 1873 return 0; 1874 1875 /* check for matching IP prefix and subnet length (V1) */ 1876 prfx_rc = smc_listen_prfx_check(new_smc, pclc); 1877 if (prfx_rc) 1878 smc_find_ism_store_rc(prfx_rc, ini); 1879 1880 /* get vlan id from IP device */ 1881 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 1882 return ini->rc ?: SMC_CLC_DECL_GETVLANERR; 1883 1884 /* check for ISM device matching V1 proposed device */ 1885 if (!prfx_rc) 1886 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 1887 if (ini->ism_dev[0]) 1888 return 0; 1889 1890 if (!smcr_indicated(pclc->hdr.typev1) && 1891 !smcr_indicated(pclc->hdr.typev2)) 1892 /* skip RDMA and decline */ 1893 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV; 1894 1895 /* check if RDMA V2 is available */ 1896 smc_find_rdma_v2_device_serv(new_smc, pclc, ini); 1897 if (ini->smcrv2.ib_dev_v2) 1898 return 0; 1899 1900 /* check if RDMA V1 is available */ 1901 if (!prfx_rc) { 1902 int rc; 1903 1904 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 1905 smc_find_ism_store_rc(rc, ini); 1906 return (!rc) ? 0 : ini->rc; 1907 } 1908 return SMC_CLC_DECL_NOSMCDEV; 1909 } 1910 1911 /* listen worker: finish RDMA setup */ 1912 static int smc_listen_rdma_finish(struct smc_sock *new_smc, 1913 struct smc_clc_msg_accept_confirm *cclc, 1914 bool local_first, 1915 struct smc_init_info *ini) 1916 { 1917 struct smc_link *link = new_smc->conn.lnk; 1918 int reason_code = 0; 1919 1920 if (local_first) 1921 smc_link_save_peer_info(link, cclc, ini); 1922 1923 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 1924 return SMC_CLC_DECL_ERR_RTOK; 1925 1926 if (local_first) { 1927 if (smc_ib_ready_link(link)) 1928 return SMC_CLC_DECL_ERR_RDYLNK; 1929 /* QP confirmation over RoCE fabric */ 1930 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1931 reason_code = smcr_serv_conf_first_link(new_smc); 1932 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1933 } 1934 return reason_code; 1935 } 1936 1937 /* setup for connection of server */ 1938 static void smc_listen_work(struct work_struct *work) 1939 { 1940 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1941 smc_listen_work); 1942 struct socket *newclcsock = new_smc->clcsock; 1943 struct smc_clc_msg_accept_confirm *cclc; 1944 struct smc_clc_msg_proposal_area *buf; 1945 struct smc_clc_msg_proposal *pclc; 1946 struct smc_init_info *ini = NULL; 1947 u8 proposal_version = SMC_V1; 1948 u8 accept_version; 1949 int rc = 0; 1950 1951 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 1952 return smc_listen_out_err(new_smc); 1953 1954 if (new_smc->use_fallback) { 1955 smc_listen_out_connected(new_smc); 1956 return; 1957 } 1958 1959 /* check if peer is smc capable */ 1960 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1961 smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC); 1962 smc_listen_out_connected(new_smc); 1963 return; 1964 } 1965 1966 /* do inband token exchange - 1967 * wait for and receive SMC Proposal CLC message 1968 */ 1969 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 1970 if (!buf) { 1971 rc = SMC_CLC_DECL_MEM; 1972 goto out_decl; 1973 } 1974 pclc = (struct smc_clc_msg_proposal *)buf; 1975 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 1976 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 1977 if (rc) 1978 goto out_decl; 1979 1980 if (pclc->hdr.version > SMC_V1) 1981 proposal_version = SMC_V2; 1982 1983 /* IPSec connections opt out of SMC optimizations */ 1984 if (using_ipsec(new_smc)) { 1985 rc = SMC_CLC_DECL_IPSEC; 1986 goto out_decl; 1987 } 1988 1989 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1990 if (!ini) { 1991 rc = SMC_CLC_DECL_MEM; 1992 goto out_decl; 1993 } 1994 1995 /* initial version checking */ 1996 rc = smc_listen_v2_check(new_smc, pclc, ini); 1997 if (rc) 1998 goto out_decl; 1999 2000 mutex_lock(&smc_server_lgr_pending); 2001 smc_close_init(new_smc); 2002 smc_rx_init(new_smc); 2003 smc_tx_init(new_smc); 2004 2005 /* determine ISM or RoCE device used for connection */ 2006 rc = smc_listen_find_device(new_smc, pclc, ini); 2007 if (rc) 2008 goto out_unlock; 2009 2010 /* send SMC Accept CLC message */ 2011 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version; 2012 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 2013 accept_version, ini->negotiated_eid); 2014 if (rc) 2015 goto out_unlock; 2016 2017 /* SMC-D does not need this lock any more */ 2018 if (ini->is_smcd) 2019 mutex_unlock(&smc_server_lgr_pending); 2020 2021 /* receive SMC Confirm CLC message */ 2022 memset(buf, 0, sizeof(*buf)); 2023 cclc = (struct smc_clc_msg_accept_confirm *)buf; 2024 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 2025 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 2026 if (rc) { 2027 if (!ini->is_smcd) 2028 goto out_unlock; 2029 goto out_decl; 2030 } 2031 2032 /* finish worker */ 2033 if (!ini->is_smcd) { 2034 rc = smc_listen_rdma_finish(new_smc, cclc, 2035 ini->first_contact_local, ini); 2036 if (rc) 2037 goto out_unlock; 2038 mutex_unlock(&smc_server_lgr_pending); 2039 } 2040 smc_conn_save_peer_info(new_smc, cclc); 2041 smc_listen_out_connected(new_smc); 2042 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini); 2043 goto out_free; 2044 2045 out_unlock: 2046 mutex_unlock(&smc_server_lgr_pending); 2047 out_decl: 2048 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 2049 proposal_version); 2050 out_free: 2051 kfree(ini); 2052 kfree(buf); 2053 } 2054 2055 static void smc_tcp_listen_work(struct work_struct *work) 2056 { 2057 struct smc_sock *lsmc = container_of(work, struct smc_sock, 2058 tcp_listen_work); 2059 struct sock *lsk = &lsmc->sk; 2060 struct smc_sock *new_smc; 2061 int rc = 0; 2062 2063 lock_sock(lsk); 2064 while (lsk->sk_state == SMC_LISTEN) { 2065 rc = smc_clcsock_accept(lsmc, &new_smc); 2066 if (rc) /* clcsock accept queue empty or error */ 2067 goto out; 2068 if (!new_smc) 2069 continue; 2070 2071 new_smc->listen_smc = lsmc; 2072 new_smc->use_fallback = lsmc->use_fallback; 2073 new_smc->fallback_rsn = lsmc->fallback_rsn; 2074 sock_hold(lsk); /* sock_put in smc_listen_work */ 2075 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 2076 smc_copy_sock_settings_to_smc(new_smc); 2077 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 2078 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 2079 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 2080 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 2081 sock_put(&new_smc->sk); 2082 } 2083 2084 out: 2085 release_sock(lsk); 2086 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 2087 } 2088 2089 static void smc_clcsock_data_ready(struct sock *listen_clcsock) 2090 { 2091 struct smc_sock *lsmc; 2092 2093 lsmc = (struct smc_sock *) 2094 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY); 2095 if (!lsmc) 2096 return; 2097 lsmc->clcsk_data_ready(listen_clcsock); 2098 if (lsmc->sk.sk_state == SMC_LISTEN) { 2099 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 2100 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 2101 sock_put(&lsmc->sk); 2102 } 2103 } 2104 2105 static int smc_listen(struct socket *sock, int backlog) 2106 { 2107 struct sock *sk = sock->sk; 2108 struct smc_sock *smc; 2109 int rc; 2110 2111 smc = smc_sk(sk); 2112 lock_sock(sk); 2113 2114 rc = -EINVAL; 2115 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 2116 smc->connect_nonblock) 2117 goto out; 2118 2119 rc = 0; 2120 if (sk->sk_state == SMC_LISTEN) { 2121 sk->sk_max_ack_backlog = backlog; 2122 goto out; 2123 } 2124 /* some socket options are handled in core, so we could not apply 2125 * them to the clc socket -- copy smc socket options to clc socket 2126 */ 2127 smc_copy_sock_settings_to_clc(smc); 2128 if (!smc->use_fallback) 2129 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 2130 2131 /* save original sk_data_ready function and establish 2132 * smc-specific sk_data_ready function 2133 */ 2134 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 2135 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 2136 smc->clcsock->sk->sk_user_data = 2137 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 2138 rc = kernel_listen(smc->clcsock, backlog); 2139 if (rc) { 2140 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready; 2141 goto out; 2142 } 2143 sk->sk_max_ack_backlog = backlog; 2144 sk->sk_ack_backlog = 0; 2145 sk->sk_state = SMC_LISTEN; 2146 2147 out: 2148 release_sock(sk); 2149 return rc; 2150 } 2151 2152 static int smc_accept(struct socket *sock, struct socket *new_sock, 2153 int flags, bool kern) 2154 { 2155 struct sock *sk = sock->sk, *nsk; 2156 DECLARE_WAITQUEUE(wait, current); 2157 struct smc_sock *lsmc; 2158 long timeo; 2159 int rc = 0; 2160 2161 lsmc = smc_sk(sk); 2162 sock_hold(sk); /* sock_put below */ 2163 lock_sock(sk); 2164 2165 if (lsmc->sk.sk_state != SMC_LISTEN) { 2166 rc = -EINVAL; 2167 release_sock(sk); 2168 goto out; 2169 } 2170 2171 /* Wait for an incoming connection */ 2172 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2173 add_wait_queue_exclusive(sk_sleep(sk), &wait); 2174 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 2175 set_current_state(TASK_INTERRUPTIBLE); 2176 if (!timeo) { 2177 rc = -EAGAIN; 2178 break; 2179 } 2180 release_sock(sk); 2181 timeo = schedule_timeout(timeo); 2182 /* wakeup by sk_data_ready in smc_listen_work() */ 2183 sched_annotate_sleep(); 2184 lock_sock(sk); 2185 if (signal_pending(current)) { 2186 rc = sock_intr_errno(timeo); 2187 break; 2188 } 2189 } 2190 set_current_state(TASK_RUNNING); 2191 remove_wait_queue(sk_sleep(sk), &wait); 2192 2193 if (!rc) 2194 rc = sock_error(nsk); 2195 release_sock(sk); 2196 if (rc) 2197 goto out; 2198 2199 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 2200 /* wait till data arrives on the socket */ 2201 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 2202 MSEC_PER_SEC); 2203 if (smc_sk(nsk)->use_fallback) { 2204 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 2205 2206 lock_sock(clcsk); 2207 if (skb_queue_empty(&clcsk->sk_receive_queue)) 2208 sk_wait_data(clcsk, &timeo, NULL); 2209 release_sock(clcsk); 2210 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 2211 lock_sock(nsk); 2212 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 2213 release_sock(nsk); 2214 } 2215 } 2216 2217 out: 2218 sock_put(sk); /* sock_hold above */ 2219 return rc; 2220 } 2221 2222 static int smc_getname(struct socket *sock, struct sockaddr *addr, 2223 int peer) 2224 { 2225 struct smc_sock *smc; 2226 2227 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 2228 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 2229 return -ENOTCONN; 2230 2231 smc = smc_sk(sock->sk); 2232 2233 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 2234 } 2235 2236 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 2237 { 2238 struct sock *sk = sock->sk; 2239 struct smc_sock *smc; 2240 int rc = -EPIPE; 2241 2242 smc = smc_sk(sk); 2243 lock_sock(sk); 2244 if ((sk->sk_state != SMC_ACTIVE) && 2245 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2246 (sk->sk_state != SMC_INIT)) 2247 goto out; 2248 2249 if (msg->msg_flags & MSG_FASTOPEN) { 2250 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2251 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2252 } else { 2253 rc = -EINVAL; 2254 goto out; 2255 } 2256 } 2257 2258 if (smc->use_fallback) { 2259 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2260 } else { 2261 rc = smc_tx_sendmsg(smc, msg, len); 2262 SMC_STAT_TX_PAYLOAD(smc, len, rc); 2263 } 2264 out: 2265 release_sock(sk); 2266 return rc; 2267 } 2268 2269 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2270 int flags) 2271 { 2272 struct sock *sk = sock->sk; 2273 struct smc_sock *smc; 2274 int rc = -ENOTCONN; 2275 2276 smc = smc_sk(sk); 2277 lock_sock(sk); 2278 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2279 /* socket was connected before, no more data to read */ 2280 rc = 0; 2281 goto out; 2282 } 2283 if ((sk->sk_state == SMC_INIT) || 2284 (sk->sk_state == SMC_LISTEN) || 2285 (sk->sk_state == SMC_CLOSED)) 2286 goto out; 2287 2288 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2289 rc = 0; 2290 goto out; 2291 } 2292 2293 if (smc->use_fallback) { 2294 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2295 } else { 2296 msg->msg_namelen = 0; 2297 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2298 SMC_STAT_RX_PAYLOAD(smc, rc, rc); 2299 } 2300 2301 out: 2302 release_sock(sk); 2303 return rc; 2304 } 2305 2306 static __poll_t smc_accept_poll(struct sock *parent) 2307 { 2308 struct smc_sock *isk = smc_sk(parent); 2309 __poll_t mask = 0; 2310 2311 spin_lock(&isk->accept_q_lock); 2312 if (!list_empty(&isk->accept_q)) 2313 mask = EPOLLIN | EPOLLRDNORM; 2314 spin_unlock(&isk->accept_q_lock); 2315 2316 return mask; 2317 } 2318 2319 static __poll_t smc_poll(struct file *file, struct socket *sock, 2320 poll_table *wait) 2321 { 2322 struct sock *sk = sock->sk; 2323 struct smc_sock *smc; 2324 __poll_t mask = 0; 2325 2326 if (!sk) 2327 return EPOLLNVAL; 2328 2329 smc = smc_sk(sock->sk); 2330 if (smc->use_fallback) { 2331 /* delegate to CLC child sock */ 2332 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2333 sk->sk_err = smc->clcsock->sk->sk_err; 2334 } else { 2335 if (sk->sk_state != SMC_CLOSED) 2336 sock_poll_wait(file, sock, wait); 2337 if (sk->sk_err) 2338 mask |= EPOLLERR; 2339 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2340 (sk->sk_state == SMC_CLOSED)) 2341 mask |= EPOLLHUP; 2342 if (sk->sk_state == SMC_LISTEN) { 2343 /* woken up by sk_data_ready in smc_listen_work() */ 2344 mask |= smc_accept_poll(sk); 2345 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2346 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2347 wait); 2348 sk->sk_err = smc->clcsock->sk->sk_err; 2349 } else { 2350 if ((sk->sk_state != SMC_INIT && 2351 atomic_read(&smc->conn.sndbuf_space)) || 2352 sk->sk_shutdown & SEND_SHUTDOWN) { 2353 mask |= EPOLLOUT | EPOLLWRNORM; 2354 } else { 2355 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2356 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2357 } 2358 if (atomic_read(&smc->conn.bytes_to_rcv)) 2359 mask |= EPOLLIN | EPOLLRDNORM; 2360 if (sk->sk_shutdown & RCV_SHUTDOWN) 2361 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2362 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2363 mask |= EPOLLIN; 2364 if (smc->conn.urg_state == SMC_URG_VALID) 2365 mask |= EPOLLPRI; 2366 } 2367 } 2368 2369 return mask; 2370 } 2371 2372 static int smc_shutdown(struct socket *sock, int how) 2373 { 2374 struct sock *sk = sock->sk; 2375 bool do_shutdown = true; 2376 struct smc_sock *smc; 2377 int rc = -EINVAL; 2378 int old_state; 2379 int rc1 = 0; 2380 2381 smc = smc_sk(sk); 2382 2383 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2384 return rc; 2385 2386 lock_sock(sk); 2387 2388 rc = -ENOTCONN; 2389 if ((sk->sk_state != SMC_ACTIVE) && 2390 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2391 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2392 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2393 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2394 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2395 goto out; 2396 if (smc->use_fallback) { 2397 rc = kernel_sock_shutdown(smc->clcsock, how); 2398 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2399 if (sk->sk_shutdown == SHUTDOWN_MASK) 2400 sk->sk_state = SMC_CLOSED; 2401 goto out; 2402 } 2403 switch (how) { 2404 case SHUT_RDWR: /* shutdown in both directions */ 2405 old_state = sk->sk_state; 2406 rc = smc_close_active(smc); 2407 if (old_state == SMC_ACTIVE && 2408 sk->sk_state == SMC_PEERCLOSEWAIT1) 2409 do_shutdown = false; 2410 break; 2411 case SHUT_WR: 2412 rc = smc_close_shutdown_write(smc); 2413 break; 2414 case SHUT_RD: 2415 rc = 0; 2416 /* nothing more to do because peer is not involved */ 2417 break; 2418 } 2419 if (do_shutdown && smc->clcsock) 2420 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2421 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2422 sk->sk_shutdown |= how + 1; 2423 2424 out: 2425 release_sock(sk); 2426 return rc ? rc : rc1; 2427 } 2428 2429 static int smc_setsockopt(struct socket *sock, int level, int optname, 2430 sockptr_t optval, unsigned int optlen) 2431 { 2432 struct sock *sk = sock->sk; 2433 struct smc_sock *smc; 2434 int val, rc; 2435 2436 if (level == SOL_TCP && optname == TCP_ULP) 2437 return -EOPNOTSUPP; 2438 2439 smc = smc_sk(sk); 2440 2441 /* generic setsockopts reaching us here always apply to the 2442 * CLC socket 2443 */ 2444 if (unlikely(!smc->clcsock->ops->setsockopt)) 2445 rc = -EOPNOTSUPP; 2446 else 2447 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2448 optval, optlen); 2449 if (smc->clcsock->sk->sk_err) { 2450 sk->sk_err = smc->clcsock->sk->sk_err; 2451 sk_error_report(sk); 2452 } 2453 2454 if (optlen < sizeof(int)) 2455 return -EINVAL; 2456 if (copy_from_sockptr(&val, optval, sizeof(int))) 2457 return -EFAULT; 2458 2459 lock_sock(sk); 2460 if (rc || smc->use_fallback) 2461 goto out; 2462 switch (optname) { 2463 case TCP_FASTOPEN: 2464 case TCP_FASTOPEN_CONNECT: 2465 case TCP_FASTOPEN_KEY: 2466 case TCP_FASTOPEN_NO_COOKIE: 2467 /* option not supported by SMC */ 2468 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2469 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); 2470 } else { 2471 rc = -EINVAL; 2472 } 2473 break; 2474 case TCP_NODELAY: 2475 if (sk->sk_state != SMC_INIT && 2476 sk->sk_state != SMC_LISTEN && 2477 sk->sk_state != SMC_CLOSED) { 2478 if (val) { 2479 SMC_STAT_INC(smc, ndly_cnt); 2480 mod_delayed_work(smc->conn.lgr->tx_wq, 2481 &smc->conn.tx_work, 0); 2482 } 2483 } 2484 break; 2485 case TCP_CORK: 2486 if (sk->sk_state != SMC_INIT && 2487 sk->sk_state != SMC_LISTEN && 2488 sk->sk_state != SMC_CLOSED) { 2489 if (!val) { 2490 SMC_STAT_INC(smc, cork_cnt); 2491 mod_delayed_work(smc->conn.lgr->tx_wq, 2492 &smc->conn.tx_work, 0); 2493 } 2494 } 2495 break; 2496 case TCP_DEFER_ACCEPT: 2497 smc->sockopt_defer_accept = val; 2498 break; 2499 default: 2500 break; 2501 } 2502 out: 2503 release_sock(sk); 2504 2505 return rc; 2506 } 2507 2508 static int smc_getsockopt(struct socket *sock, int level, int optname, 2509 char __user *optval, int __user *optlen) 2510 { 2511 struct smc_sock *smc; 2512 2513 smc = smc_sk(sock->sk); 2514 /* socket options apply to the CLC socket */ 2515 if (unlikely(!smc->clcsock->ops->getsockopt)) 2516 return -EOPNOTSUPP; 2517 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2518 optval, optlen); 2519 } 2520 2521 static int smc_ioctl(struct socket *sock, unsigned int cmd, 2522 unsigned long arg) 2523 { 2524 union smc_host_cursor cons, urg; 2525 struct smc_connection *conn; 2526 struct smc_sock *smc; 2527 int answ; 2528 2529 smc = smc_sk(sock->sk); 2530 conn = &smc->conn; 2531 lock_sock(&smc->sk); 2532 if (smc->use_fallback) { 2533 if (!smc->clcsock) { 2534 release_sock(&smc->sk); 2535 return -EBADF; 2536 } 2537 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2538 release_sock(&smc->sk); 2539 return answ; 2540 } 2541 switch (cmd) { 2542 case SIOCINQ: /* same as FIONREAD */ 2543 if (smc->sk.sk_state == SMC_LISTEN) { 2544 release_sock(&smc->sk); 2545 return -EINVAL; 2546 } 2547 if (smc->sk.sk_state == SMC_INIT || 2548 smc->sk.sk_state == SMC_CLOSED) 2549 answ = 0; 2550 else 2551 answ = atomic_read(&smc->conn.bytes_to_rcv); 2552 break; 2553 case SIOCOUTQ: 2554 /* output queue size (not send + not acked) */ 2555 if (smc->sk.sk_state == SMC_LISTEN) { 2556 release_sock(&smc->sk); 2557 return -EINVAL; 2558 } 2559 if (smc->sk.sk_state == SMC_INIT || 2560 smc->sk.sk_state == SMC_CLOSED) 2561 answ = 0; 2562 else 2563 answ = smc->conn.sndbuf_desc->len - 2564 atomic_read(&smc->conn.sndbuf_space); 2565 break; 2566 case SIOCOUTQNSD: 2567 /* output queue size (not send only) */ 2568 if (smc->sk.sk_state == SMC_LISTEN) { 2569 release_sock(&smc->sk); 2570 return -EINVAL; 2571 } 2572 if (smc->sk.sk_state == SMC_INIT || 2573 smc->sk.sk_state == SMC_CLOSED) 2574 answ = 0; 2575 else 2576 answ = smc_tx_prepared_sends(&smc->conn); 2577 break; 2578 case SIOCATMARK: 2579 if (smc->sk.sk_state == SMC_LISTEN) { 2580 release_sock(&smc->sk); 2581 return -EINVAL; 2582 } 2583 if (smc->sk.sk_state == SMC_INIT || 2584 smc->sk.sk_state == SMC_CLOSED) { 2585 answ = 0; 2586 } else { 2587 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2588 smc_curs_copy(&urg, &conn->urg_curs, conn); 2589 answ = smc_curs_diff(conn->rmb_desc->len, 2590 &cons, &urg) == 1; 2591 } 2592 break; 2593 default: 2594 release_sock(&smc->sk); 2595 return -ENOIOCTLCMD; 2596 } 2597 release_sock(&smc->sk); 2598 2599 return put_user(answ, (int __user *)arg); 2600 } 2601 2602 static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2603 int offset, size_t size, int flags) 2604 { 2605 struct sock *sk = sock->sk; 2606 struct smc_sock *smc; 2607 int rc = -EPIPE; 2608 2609 smc = smc_sk(sk); 2610 lock_sock(sk); 2611 if (sk->sk_state != SMC_ACTIVE) { 2612 release_sock(sk); 2613 goto out; 2614 } 2615 release_sock(sk); 2616 if (smc->use_fallback) { 2617 rc = kernel_sendpage(smc->clcsock, page, offset, 2618 size, flags); 2619 } else { 2620 SMC_STAT_INC(smc, sendpage_cnt); 2621 rc = sock_no_sendpage(sock, page, offset, size, flags); 2622 } 2623 2624 out: 2625 return rc; 2626 } 2627 2628 /* Map the affected portions of the rmbe into an spd, note the number of bytes 2629 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2630 * updates till whenever a respective page has been fully processed. 2631 * Note that subsequent recv() calls have to wait till all splice() processing 2632 * completed. 2633 */ 2634 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2635 struct pipe_inode_info *pipe, size_t len, 2636 unsigned int flags) 2637 { 2638 struct sock *sk = sock->sk; 2639 struct smc_sock *smc; 2640 int rc = -ENOTCONN; 2641 2642 smc = smc_sk(sk); 2643 lock_sock(sk); 2644 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2645 /* socket was connected before, no more data to read */ 2646 rc = 0; 2647 goto out; 2648 } 2649 if (sk->sk_state == SMC_INIT || 2650 sk->sk_state == SMC_LISTEN || 2651 sk->sk_state == SMC_CLOSED) 2652 goto out; 2653 2654 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2655 rc = 0; 2656 goto out; 2657 } 2658 2659 if (smc->use_fallback) { 2660 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2661 pipe, len, flags); 2662 } else { 2663 if (*ppos) { 2664 rc = -ESPIPE; 2665 goto out; 2666 } 2667 if (flags & SPLICE_F_NONBLOCK) 2668 flags = MSG_DONTWAIT; 2669 else 2670 flags = 0; 2671 SMC_STAT_INC(smc, splice_cnt); 2672 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2673 } 2674 out: 2675 release_sock(sk); 2676 2677 return rc; 2678 } 2679 2680 /* must look like tcp */ 2681 static const struct proto_ops smc_sock_ops = { 2682 .family = PF_SMC, 2683 .owner = THIS_MODULE, 2684 .release = smc_release, 2685 .bind = smc_bind, 2686 .connect = smc_connect, 2687 .socketpair = sock_no_socketpair, 2688 .accept = smc_accept, 2689 .getname = smc_getname, 2690 .poll = smc_poll, 2691 .ioctl = smc_ioctl, 2692 .listen = smc_listen, 2693 .shutdown = smc_shutdown, 2694 .setsockopt = smc_setsockopt, 2695 .getsockopt = smc_getsockopt, 2696 .sendmsg = smc_sendmsg, 2697 .recvmsg = smc_recvmsg, 2698 .mmap = sock_no_mmap, 2699 .sendpage = smc_sendpage, 2700 .splice_read = smc_splice_read, 2701 }; 2702 2703 static int smc_create(struct net *net, struct socket *sock, int protocol, 2704 int kern) 2705 { 2706 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2707 struct smc_sock *smc; 2708 struct sock *sk; 2709 int rc; 2710 2711 rc = -ESOCKTNOSUPPORT; 2712 if (sock->type != SOCK_STREAM) 2713 goto out; 2714 2715 rc = -EPROTONOSUPPORT; 2716 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2717 goto out; 2718 2719 rc = -ENOBUFS; 2720 sock->ops = &smc_sock_ops; 2721 sk = smc_sock_alloc(net, sock, protocol); 2722 if (!sk) 2723 goto out; 2724 2725 /* create internal TCP socket for CLC handshake and fallback */ 2726 smc = smc_sk(sk); 2727 smc->use_fallback = false; /* assume rdma capability first */ 2728 smc->fallback_rsn = 0; 2729 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2730 &smc->clcsock); 2731 if (rc) { 2732 sk_common_release(sk); 2733 goto out; 2734 } 2735 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2736 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2737 2738 out: 2739 return rc; 2740 } 2741 2742 static const struct net_proto_family smc_sock_family_ops = { 2743 .family = PF_SMC, 2744 .owner = THIS_MODULE, 2745 .create = smc_create, 2746 }; 2747 2748 unsigned int smc_net_id; 2749 2750 static __net_init int smc_net_init(struct net *net) 2751 { 2752 return smc_pnet_net_init(net); 2753 } 2754 2755 static void __net_exit smc_net_exit(struct net *net) 2756 { 2757 smc_pnet_net_exit(net); 2758 } 2759 2760 static __net_init int smc_net_stat_init(struct net *net) 2761 { 2762 return smc_stats_init(net); 2763 } 2764 2765 static void __net_exit smc_net_stat_exit(struct net *net) 2766 { 2767 smc_stats_exit(net); 2768 } 2769 2770 static struct pernet_operations smc_net_ops = { 2771 .init = smc_net_init, 2772 .exit = smc_net_exit, 2773 .id = &smc_net_id, 2774 .size = sizeof(struct smc_net), 2775 }; 2776 2777 static struct pernet_operations smc_net_stat_ops = { 2778 .init = smc_net_stat_init, 2779 .exit = smc_net_stat_exit, 2780 }; 2781 2782 static int __init smc_init(void) 2783 { 2784 int rc; 2785 2786 rc = register_pernet_subsys(&smc_net_ops); 2787 if (rc) 2788 return rc; 2789 2790 rc = register_pernet_subsys(&smc_net_stat_ops); 2791 if (rc) 2792 return rc; 2793 2794 smc_ism_init(); 2795 smc_clc_init(); 2796 2797 rc = smc_nl_init(); 2798 if (rc) 2799 goto out_pernet_subsys; 2800 2801 rc = smc_pnet_init(); 2802 if (rc) 2803 goto out_nl; 2804 2805 rc = -ENOMEM; 2806 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 2807 if (!smc_hs_wq) 2808 goto out_pnet; 2809 2810 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 2811 if (!smc_close_wq) 2812 goto out_alloc_hs_wq; 2813 2814 rc = smc_core_init(); 2815 if (rc) { 2816 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 2817 goto out_alloc_wqs; 2818 } 2819 2820 rc = smc_llc_init(); 2821 if (rc) { 2822 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 2823 goto out_core; 2824 } 2825 2826 rc = smc_cdc_init(); 2827 if (rc) { 2828 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 2829 goto out_core; 2830 } 2831 2832 rc = proto_register(&smc_proto, 1); 2833 if (rc) { 2834 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 2835 goto out_core; 2836 } 2837 2838 rc = proto_register(&smc_proto6, 1); 2839 if (rc) { 2840 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 2841 goto out_proto; 2842 } 2843 2844 rc = sock_register(&smc_sock_family_ops); 2845 if (rc) { 2846 pr_err("%s: sock_register fails with %d\n", __func__, rc); 2847 goto out_proto6; 2848 } 2849 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 2850 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 2851 2852 rc = smc_ib_register_client(); 2853 if (rc) { 2854 pr_err("%s: ib_register fails with %d\n", __func__, rc); 2855 goto out_sock; 2856 } 2857 2858 static_branch_enable(&tcp_have_smc); 2859 return 0; 2860 2861 out_sock: 2862 sock_unregister(PF_SMC); 2863 out_proto6: 2864 proto_unregister(&smc_proto6); 2865 out_proto: 2866 proto_unregister(&smc_proto); 2867 out_core: 2868 smc_core_exit(); 2869 out_alloc_wqs: 2870 destroy_workqueue(smc_close_wq); 2871 out_alloc_hs_wq: 2872 destroy_workqueue(smc_hs_wq); 2873 out_pnet: 2874 smc_pnet_exit(); 2875 out_nl: 2876 smc_nl_exit(); 2877 out_pernet_subsys: 2878 unregister_pernet_subsys(&smc_net_ops); 2879 2880 return rc; 2881 } 2882 2883 static void __exit smc_exit(void) 2884 { 2885 static_branch_disable(&tcp_have_smc); 2886 sock_unregister(PF_SMC); 2887 smc_core_exit(); 2888 smc_ib_unregister_client(); 2889 destroy_workqueue(smc_close_wq); 2890 destroy_workqueue(smc_hs_wq); 2891 proto_unregister(&smc_proto6); 2892 proto_unregister(&smc_proto); 2893 smc_pnet_exit(); 2894 smc_nl_exit(); 2895 smc_clc_exit(); 2896 unregister_pernet_subsys(&smc_net_stat_ops); 2897 unregister_pernet_subsys(&smc_net_ops); 2898 rcu_barrier(); 2899 } 2900 2901 module_init(smc_init); 2902 module_exit(smc_exit); 2903 2904 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 2905 MODULE_DESCRIPTION("smc socket address family"); 2906 MODULE_LICENSE("GPL"); 2907 MODULE_ALIAS_NETPROTO(PF_SMC); 2908