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