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_tx.h" 49#include "smc_rx.h" 50#include "smc_close.h" 51 52static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group 53 * creation on server 54 */ 55static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group 56 * creation on client 57 */ 58 59struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ 60struct workqueue_struct *smc_close_wq; /* wq for close work */ 61 62static void smc_tcp_listen_work(struct work_struct *); 63static void smc_connect_work(struct work_struct *); 64 65static void smc_set_keepalive(struct sock *sk, int val) 66{ 67 struct smc_sock *smc = smc_sk(sk); 68 69 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); 70} 71 72static struct smc_hashinfo smc_v4_hashinfo = { 73 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), 74}; 75 76static struct smc_hashinfo smc_v6_hashinfo = { 77 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), 78}; 79 80int smc_hash_sk(struct sock *sk) 81{ 82 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 83 struct hlist_head *head; 84 85 head = &h->ht; 86 87 write_lock_bh(&h->lock); 88 sk_add_node(sk, head); 89 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 90 write_unlock_bh(&h->lock); 91 92 return 0; 93} 94EXPORT_SYMBOL_GPL(smc_hash_sk); 95 96void smc_unhash_sk(struct sock *sk) 97{ 98 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; 99 100 write_lock_bh(&h->lock); 101 if (sk_del_node_init(sk)) 102 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 103 write_unlock_bh(&h->lock); 104} 105EXPORT_SYMBOL_GPL(smc_unhash_sk); 106 107struct proto smc_proto = { 108 .name = "SMC", 109 .owner = THIS_MODULE, 110 .keepalive = smc_set_keepalive, 111 .hash = smc_hash_sk, 112 .unhash = smc_unhash_sk, 113 .obj_size = sizeof(struct smc_sock), 114 .h.smc_hash = &smc_v4_hashinfo, 115 .slab_flags = SLAB_TYPESAFE_BY_RCU, 116}; 117EXPORT_SYMBOL_GPL(smc_proto); 118 119struct proto smc_proto6 = { 120 .name = "SMC6", 121 .owner = THIS_MODULE, 122 .keepalive = smc_set_keepalive, 123 .hash = smc_hash_sk, 124 .unhash = smc_unhash_sk, 125 .obj_size = sizeof(struct smc_sock), 126 .h.smc_hash = &smc_v6_hashinfo, 127 .slab_flags = SLAB_TYPESAFE_BY_RCU, 128}; 129EXPORT_SYMBOL_GPL(smc_proto6); 130 131static void smc_restore_fallback_changes(struct smc_sock *smc) 132{ 133 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */ 134 smc->clcsock->file->private_data = smc->sk.sk_socket; 135 smc->clcsock->file = NULL; 136 } 137} 138 139static int __smc_release(struct smc_sock *smc) 140{ 141 struct sock *sk = &smc->sk; 142 int rc = 0; 143 144 if (!smc->use_fallback) { 145 rc = smc_close_active(smc); 146 smc_sock_set_flag(sk, SOCK_DEAD); 147 sk->sk_shutdown |= SHUTDOWN_MASK; 148 } else { 149 if (sk->sk_state != SMC_CLOSED) { 150 if (sk->sk_state != SMC_LISTEN && 151 sk->sk_state != SMC_INIT) 152 sock_put(sk); /* passive closing */ 153 if (sk->sk_state == SMC_LISTEN) { 154 /* wake up clcsock accept */ 155 rc = kernel_sock_shutdown(smc->clcsock, 156 SHUT_RDWR); 157 } 158 sk->sk_state = SMC_CLOSED; 159 sk->sk_state_change(sk); 160 } 161 smc_restore_fallback_changes(smc); 162 } 163 164 sk->sk_prot->unhash(sk); 165 166 if (sk->sk_state == SMC_CLOSED) { 167 if (smc->clcsock) { 168 release_sock(sk); 169 smc_clcsock_release(smc); 170 lock_sock(sk); 171 } 172 if (!smc->use_fallback) 173 smc_conn_free(&smc->conn); 174 } 175 176 return rc; 177} 178 179static int smc_release(struct socket *sock) 180{ 181 struct sock *sk = sock->sk; 182 struct smc_sock *smc; 183 int old_state, rc = 0; 184 185 if (!sk) 186 goto out; 187 188 sock_hold(sk); /* sock_put below */ 189 smc = smc_sk(sk); 190 191 old_state = sk->sk_state; 192 193 /* cleanup for a dangling non-blocking connect */ 194 if (smc->connect_nonblock && old_state == SMC_INIT) 195 tcp_abort(smc->clcsock->sk, ECONNABORTED); 196 197 if (cancel_work_sync(&smc->connect_work)) 198 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */ 199 200 if (sk->sk_state == SMC_LISTEN) 201 /* smc_close_non_accepted() is called and acquires 202 * sock lock for child sockets again 203 */ 204 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 205 else 206 lock_sock(sk); 207 208 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE && 209 !smc->use_fallback) 210 smc_close_active_abort(smc); 211 212 rc = __smc_release(smc); 213 214 /* detach socket */ 215 sock_orphan(sk); 216 sock->sk = NULL; 217 release_sock(sk); 218 219 sock_put(sk); /* sock_hold above */ 220 sock_put(sk); /* final sock_put */ 221out: 222 return rc; 223} 224 225static void smc_destruct(struct sock *sk) 226{ 227 if (sk->sk_state != SMC_CLOSED) 228 return; 229 if (!sock_flag(sk, SOCK_DEAD)) 230 return; 231 232 sk_refcnt_debug_dec(sk); 233} 234 235static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, 236 int protocol) 237{ 238 struct smc_sock *smc; 239 struct proto *prot; 240 struct sock *sk; 241 242 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; 243 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); 244 if (!sk) 245 return NULL; 246 247 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ 248 sk->sk_state = SMC_INIT; 249 sk->sk_destruct = smc_destruct; 250 sk->sk_protocol = protocol; 251 smc = smc_sk(sk); 252 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); 253 INIT_WORK(&smc->connect_work, smc_connect_work); 254 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); 255 INIT_LIST_HEAD(&smc->accept_q); 256 spin_lock_init(&smc->accept_q_lock); 257 spin_lock_init(&smc->conn.send_lock); 258 sk->sk_prot->hash(sk); 259 sk_refcnt_debug_inc(sk); 260 mutex_init(&smc->clcsock_release_lock); 261 262 return sk; 263} 264 265static int smc_bind(struct socket *sock, struct sockaddr *uaddr, 266 int addr_len) 267{ 268 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; 269 struct sock *sk = sock->sk; 270 struct smc_sock *smc; 271 int rc; 272 273 smc = smc_sk(sk); 274 275 /* replicate tests from inet_bind(), to be safe wrt. future changes */ 276 rc = -EINVAL; 277 if (addr_len < sizeof(struct sockaddr_in)) 278 goto out; 279 280 rc = -EAFNOSUPPORT; 281 if (addr->sin_family != AF_INET && 282 addr->sin_family != AF_INET6 && 283 addr->sin_family != AF_UNSPEC) 284 goto out; 285 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ 286 if (addr->sin_family == AF_UNSPEC && 287 addr->sin_addr.s_addr != htonl(INADDR_ANY)) 288 goto out; 289 290 lock_sock(sk); 291 292 /* Check if socket is already active */ 293 rc = -EINVAL; 294 if (sk->sk_state != SMC_INIT || smc->connect_nonblock) 295 goto out_rel; 296 297 smc->clcsock->sk->sk_reuse = sk->sk_reuse; 298 rc = kernel_bind(smc->clcsock, uaddr, addr_len); 299 300out_rel: 301 release_sock(sk); 302out: 303 return rc; 304} 305 306static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, 307 unsigned long mask) 308{ 309 /* options we don't get control via setsockopt for */ 310 nsk->sk_type = osk->sk_type; 311 nsk->sk_sndbuf = osk->sk_sndbuf; 312 nsk->sk_rcvbuf = osk->sk_rcvbuf; 313 nsk->sk_sndtimeo = osk->sk_sndtimeo; 314 nsk->sk_rcvtimeo = osk->sk_rcvtimeo; 315 nsk->sk_mark = osk->sk_mark; 316 nsk->sk_priority = osk->sk_priority; 317 nsk->sk_rcvlowat = osk->sk_rcvlowat; 318 nsk->sk_bound_dev_if = osk->sk_bound_dev_if; 319 nsk->sk_err = osk->sk_err; 320 321 nsk->sk_flags &= ~mask; 322 nsk->sk_flags |= osk->sk_flags & mask; 323} 324 325#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ 326 (1UL << SOCK_KEEPOPEN) | \ 327 (1UL << SOCK_LINGER) | \ 328 (1UL << SOCK_BROADCAST) | \ 329 (1UL << SOCK_TIMESTAMP) | \ 330 (1UL << SOCK_DBG) | \ 331 (1UL << SOCK_RCVTSTAMP) | \ 332 (1UL << SOCK_RCVTSTAMPNS) | \ 333 (1UL << SOCK_LOCALROUTE) | \ 334 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ 335 (1UL << SOCK_RXQ_OVFL) | \ 336 (1UL << SOCK_WIFI_STATUS) | \ 337 (1UL << SOCK_NOFCS) | \ 338 (1UL << SOCK_FILTER_LOCKED) | \ 339 (1UL << SOCK_TSTAMP_NEW)) 340/* copy only relevant settings and flags of SOL_SOCKET level from smc to 341 * clc socket (since smc is not called for these options from net/core) 342 */ 343static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) 344{ 345 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); 346} 347 348#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ 349 (1UL << SOCK_KEEPOPEN) | \ 350 (1UL << SOCK_LINGER) | \ 351 (1UL << SOCK_DBG)) 352/* copy only settings and flags relevant for smc from clc to smc socket */ 353static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) 354{ 355 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); 356} 357 358/* register the new rmb on all links */ 359static int smcr_lgr_reg_rmbs(struct smc_link *link, 360 struct smc_buf_desc *rmb_desc) 361{ 362 struct smc_link_group *lgr = link->lgr; 363 int i, rc = 0; 364 365 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 366 if (rc) 367 return rc; 368 /* protect against parallel smc_llc_cli_rkey_exchange() and 369 * parallel smcr_link_reg_rmb() 370 */ 371 mutex_lock(&lgr->llc_conf_mutex); 372 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 373 if (!smc_link_active(&lgr->lnk[i])) 374 continue; 375 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc); 376 if (rc) 377 goto out; 378 } 379 380 /* exchange confirm_rkey msg with peer */ 381 rc = smc_llc_do_confirm_rkey(link, rmb_desc); 382 if (rc) { 383 rc = -EFAULT; 384 goto out; 385 } 386 rmb_desc->is_conf_rkey = true; 387out: 388 mutex_unlock(&lgr->llc_conf_mutex); 389 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 390 return rc; 391} 392 393static int smcr_clnt_conf_first_link(struct smc_sock *smc) 394{ 395 struct smc_link *link = smc->conn.lnk; 396 struct smc_llc_qentry *qentry; 397 int rc; 398 399 /* Receive CONFIRM LINK request from server over RoCE fabric. 400 * Increasing the client's timeout by twice as much as the server's 401 * timeout by default can temporarily avoid decline messages of 402 * both sides crossing or colliding 403 */ 404 qentry = smc_llc_wait(link->lgr, NULL, 2 * SMC_LLC_WAIT_TIME, 405 SMC_LLC_CONFIRM_LINK); 406 if (!qentry) { 407 struct smc_clc_msg_decline dclc; 408 409 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 410 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 411 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 412 } 413 smc_llc_save_peer_uid(qentry); 414 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ); 415 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 416 if (rc) 417 return SMC_CLC_DECL_RMBE_EC; 418 419 rc = smc_ib_modify_qp_rts(link); 420 if (rc) 421 return SMC_CLC_DECL_ERR_RDYLNK; 422 423 smc_wr_remember_qp_attr(link); 424 425 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 426 return SMC_CLC_DECL_ERR_REGRMB; 427 428 /* confirm_rkey is implicit on 1st contact */ 429 smc->conn.rmb_desc->is_conf_rkey = true; 430 431 /* send CONFIRM LINK response over RoCE fabric */ 432 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); 433 if (rc < 0) 434 return SMC_CLC_DECL_TIMEOUT_CL; 435 436 smc_llc_link_active(link); 437 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 438 439 /* optional 2nd link, receive ADD LINK request from server */ 440 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME, 441 SMC_LLC_ADD_LINK); 442 if (!qentry) { 443 struct smc_clc_msg_decline dclc; 444 445 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 446 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 447 if (rc == -EAGAIN) 448 rc = 0; /* no DECLINE received, go with one link */ 449 return rc; 450 } 451 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl); 452 smc_llc_cli_add_link(link, qentry); 453 return 0; 454} 455 456static void smcr_conn_save_peer_info(struct smc_sock *smc, 457 struct smc_clc_msg_accept_confirm *clc) 458{ 459 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size); 460 461 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx; 462 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token); 463 smc->conn.peer_rmbe_size = bufsize; 464 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 465 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); 466} 467 468static bool smc_isascii(char *hostname) 469{ 470 int i; 471 472 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++) 473 if (!isascii(hostname[i])) 474 return false; 475 return true; 476} 477 478static void smcd_conn_save_peer_info(struct smc_sock *smc, 479 struct smc_clc_msg_accept_confirm *clc) 480{ 481 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size); 482 483 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx; 484 smc->conn.peer_token = clc->d0.token; 485 /* msg header takes up space in the buffer */ 486 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); 487 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); 488 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; 489 if (clc->hdr.version > SMC_V1 && 490 (clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) { 491 struct smc_clc_msg_accept_confirm_v2 *clc_v2 = 492 (struct smc_clc_msg_accept_confirm_v2 *)clc; 493 struct smc_clc_first_contact_ext *fce = 494 (struct smc_clc_first_contact_ext *) 495 (((u8 *)clc_v2) + sizeof(*clc_v2)); 496 497 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid, 498 SMC_MAX_EID_LEN); 499 smc->conn.lgr->peer_os = fce->os_type; 500 smc->conn.lgr->peer_smc_release = fce->release; 501 if (smc_isascii(fce->hostname)) 502 memcpy(smc->conn.lgr->peer_hostname, fce->hostname, 503 SMC_MAX_HOSTNAME_LEN); 504 } 505} 506 507static void smc_conn_save_peer_info(struct smc_sock *smc, 508 struct smc_clc_msg_accept_confirm *clc) 509{ 510 if (smc->conn.lgr->is_smcd) 511 smcd_conn_save_peer_info(smc, clc); 512 else 513 smcr_conn_save_peer_info(smc, clc); 514} 515 516static void smc_link_save_peer_info(struct smc_link *link, 517 struct smc_clc_msg_accept_confirm *clc) 518{ 519 link->peer_qpn = ntoh24(clc->r0.qpn); 520 memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE); 521 memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac)); 522 link->peer_psn = ntoh24(clc->r0.psn); 523 link->peer_mtu = clc->r0.qp_mtu; 524} 525 526static void smc_switch_to_fallback(struct smc_sock *smc) 527{ 528 wait_queue_head_t *smc_wait = sk_sleep(&smc->sk); 529 wait_queue_head_t *clc_wait = sk_sleep(smc->clcsock->sk); 530 unsigned long flags; 531 532 smc->use_fallback = true; 533 if (smc->sk.sk_socket && smc->sk.sk_socket->file) { 534 smc->clcsock->file = smc->sk.sk_socket->file; 535 smc->clcsock->file->private_data = smc->clcsock; 536 smc->clcsock->wq.fasync_list = 537 smc->sk.sk_socket->wq.fasync_list; 538 539 /* There may be some entries remaining in 540 * smc socket->wq, which should be removed 541 * to clcsocket->wq during the fallback. 542 */ 543 spin_lock_irqsave(&smc_wait->lock, flags); 544 spin_lock_nested(&clc_wait->lock, SINGLE_DEPTH_NESTING); 545 list_splice_init(&smc_wait->head, &clc_wait->head); 546 spin_unlock(&clc_wait->lock); 547 spin_unlock_irqrestore(&smc_wait->lock, flags); 548 } 549} 550 551/* fall back during connect */ 552static int smc_connect_fallback(struct smc_sock *smc, int reason_code) 553{ 554 smc_switch_to_fallback(smc); 555 smc->fallback_rsn = reason_code; 556 smc_copy_sock_settings_to_clc(smc); 557 smc->connect_nonblock = 0; 558 if (smc->sk.sk_state == SMC_INIT) 559 smc->sk.sk_state = SMC_ACTIVE; 560 return 0; 561} 562 563/* decline and fall back during connect */ 564static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code, 565 u8 version) 566{ 567 int rc; 568 569 if (reason_code < 0) { /* error, fallback is not possible */ 570 if (smc->sk.sk_state == SMC_INIT) 571 sock_put(&smc->sk); /* passive closing */ 572 return reason_code; 573 } 574 if (reason_code != SMC_CLC_DECL_PEERDECL) { 575 rc = smc_clc_send_decline(smc, reason_code, version); 576 if (rc < 0) { 577 if (smc->sk.sk_state == SMC_INIT) 578 sock_put(&smc->sk); /* passive closing */ 579 return rc; 580 } 581 } 582 return smc_connect_fallback(smc, reason_code); 583} 584 585/* abort connecting */ 586static void smc_connect_abort(struct smc_sock *smc, int local_first) 587{ 588 if (local_first) 589 smc_lgr_cleanup_early(&smc->conn); 590 else 591 smc_conn_free(&smc->conn); 592} 593 594/* check if there is a rdma device available for this connection. */ 595/* called for connect and listen */ 596static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini) 597{ 598 /* PNET table look up: search active ib_device and port 599 * within same PNETID that also contains the ethernet device 600 * used for the internal TCP socket 601 */ 602 smc_pnet_find_roce_resource(smc->clcsock->sk, ini); 603 if (!ini->ib_dev) 604 return SMC_CLC_DECL_NOSMCRDEV; 605 return 0; 606} 607 608/* check if there is an ISM device available for this connection. */ 609/* called for connect and listen */ 610static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini) 611{ 612 /* Find ISM device with same PNETID as connecting interface */ 613 smc_pnet_find_ism_resource(smc->clcsock->sk, ini); 614 if (!ini->ism_dev[0]) 615 return SMC_CLC_DECL_NOSMCDDEV; 616 else 617 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]); 618 return 0; 619} 620 621/* is chid unique for the ism devices that are already determined? */ 622static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini, 623 int cnt) 624{ 625 int i = (!ini->ism_dev[0]) ? 1 : 0; 626 627 for (; i < cnt; i++) 628 if (ini->ism_chid[i] == chid) 629 return false; 630 return true; 631} 632 633/* determine possible V2 ISM devices (either without PNETID or with PNETID plus 634 * PNETID matching net_device) 635 */ 636static int smc_find_ism_v2_device_clnt(struct smc_sock *smc, 637 struct smc_init_info *ini) 638{ 639 int rc = SMC_CLC_DECL_NOSMCDDEV; 640 struct smcd_dev *smcd; 641 int i = 1; 642 u16 chid; 643 644 if (smcd_indicated(ini->smc_type_v1)) 645 rc = 0; /* already initialized for V1 */ 646 mutex_lock(&smcd_dev_list.mutex); 647 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 648 if (smcd->going_away || smcd == ini->ism_dev[0]) 649 continue; 650 chid = smc_ism_get_chid(smcd); 651 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i)) 652 continue; 653 if (!smc_pnet_is_pnetid_set(smcd->pnetid) || 654 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) { 655 ini->ism_dev[i] = smcd; 656 ini->ism_chid[i] = chid; 657 ini->is_smcd = true; 658 rc = 0; 659 i++; 660 if (i > SMC_MAX_ISM_DEVS) 661 break; 662 } 663 } 664 mutex_unlock(&smcd_dev_list.mutex); 665 ini->ism_offered_cnt = i - 1; 666 if (!ini->ism_dev[0] && !ini->ism_dev[1]) 667 ini->smcd_version = 0; 668 669 return rc; 670} 671 672/* Check for VLAN ID and register it on ISM device just for CLC handshake */ 673static int smc_connect_ism_vlan_setup(struct smc_sock *smc, 674 struct smc_init_info *ini) 675{ 676 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id)) 677 return SMC_CLC_DECL_ISMVLANERR; 678 return 0; 679} 680 681static int smc_find_proposal_devices(struct smc_sock *smc, 682 struct smc_init_info *ini) 683{ 684 int rc = 0; 685 686 /* check if there is an ism device available */ 687 if (ini->smcd_version & SMC_V1) { 688 if (smc_find_ism_device(smc, ini) || 689 smc_connect_ism_vlan_setup(smc, ini)) { 690 if (ini->smc_type_v1 == SMC_TYPE_B) 691 ini->smc_type_v1 = SMC_TYPE_R; 692 else 693 ini->smc_type_v1 = SMC_TYPE_N; 694 } /* else ISM V1 is supported for this connection */ 695 if (smc_find_rdma_device(smc, ini)) { 696 if (ini->smc_type_v1 == SMC_TYPE_B) 697 ini->smc_type_v1 = SMC_TYPE_D; 698 else 699 ini->smc_type_v1 = SMC_TYPE_N; 700 } /* else RDMA is supported for this connection */ 701 } 702 if (smc_ism_v2_capable && smc_find_ism_v2_device_clnt(smc, ini)) 703 ini->smc_type_v2 = SMC_TYPE_N; 704 705 /* if neither ISM nor RDMA are supported, fallback */ 706 if (!smcr_indicated(ini->smc_type_v1) && 707 ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N) 708 rc = SMC_CLC_DECL_NOSMCDEV; 709 710 return rc; 711} 712 713/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is 714 * used, the VLAN ID will be registered again during the connection setup. 715 */ 716static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, 717 struct smc_init_info *ini) 718{ 719 if (!smcd_indicated(ini->smc_type_v1)) 720 return 0; 721 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id)) 722 return SMC_CLC_DECL_CNFERR; 723 return 0; 724} 725 726#define SMC_CLC_MAX_ACCEPT_LEN \ 727 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \ 728 sizeof(struct smc_clc_first_contact_ext) + \ 729 sizeof(struct smc_clc_msg_trail)) 730 731/* CLC handshake during connect */ 732static int smc_connect_clc(struct smc_sock *smc, 733 struct smc_clc_msg_accept_confirm_v2 *aclc2, 734 struct smc_init_info *ini) 735{ 736 int rc = 0; 737 738 /* do inband token exchange */ 739 rc = smc_clc_send_proposal(smc, ini); 740 if (rc) 741 return rc; 742 /* receive SMC Accept CLC message */ 743 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN, 744 SMC_CLC_ACCEPT, CLC_WAIT_TIME); 745} 746 747/* setup for RDMA connection of client */ 748static int smc_connect_rdma(struct smc_sock *smc, 749 struct smc_clc_msg_accept_confirm *aclc, 750 struct smc_init_info *ini) 751{ 752 int i, reason_code = 0; 753 struct smc_link *link; 754 755 ini->is_smcd = false; 756 ini->ib_lcl = &aclc->r0.lcl; 757 ini->ib_clcqpn = ntoh24(aclc->r0.qpn); 758 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 759 760 mutex_lock(&smc_client_lgr_pending); 761 reason_code = smc_conn_create(smc, ini); 762 if (reason_code) { 763 mutex_unlock(&smc_client_lgr_pending); 764 return reason_code; 765 } 766 767 smc_conn_save_peer_info(smc, aclc); 768 769 if (ini->first_contact_local) { 770 link = smc->conn.lnk; 771 } else { 772 /* set link that was assigned by server */ 773 link = NULL; 774 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 775 struct smc_link *l = &smc->conn.lgr->lnk[i]; 776 777 if (l->peer_qpn == ntoh24(aclc->r0.qpn) && 778 !memcmp(l->peer_gid, &aclc->r0.lcl.gid, 779 SMC_GID_SIZE) && 780 !memcmp(l->peer_mac, &aclc->r0.lcl.mac, 781 sizeof(l->peer_mac))) { 782 link = l; 783 break; 784 } 785 } 786 if (!link) { 787 reason_code = SMC_CLC_DECL_NOSRVLINK; 788 goto connect_abort; 789 } 790 smc->conn.lnk = link; 791 } 792 793 /* create send buffer and rmb */ 794 if (smc_buf_create(smc, false)) { 795 reason_code = SMC_CLC_DECL_MEM; 796 goto connect_abort; 797 } 798 799 if (ini->first_contact_local) 800 smc_link_save_peer_info(link, aclc); 801 802 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) { 803 reason_code = SMC_CLC_DECL_ERR_RTOK; 804 goto connect_abort; 805 } 806 807 smc_close_init(smc); 808 smc_rx_init(smc); 809 810 if (ini->first_contact_local) { 811 if (smc_ib_ready_link(link)) { 812 reason_code = SMC_CLC_DECL_ERR_RDYLNK; 813 goto connect_abort; 814 } 815 } else { 816 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) { 817 reason_code = SMC_CLC_DECL_ERR_REGRMB; 818 goto connect_abort; 819 } 820 } 821 smc_rmb_sync_sg_for_device(&smc->conn); 822 823 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local, 824 SMC_V1); 825 if (reason_code) 826 goto connect_abort; 827 828 smc_tx_init(smc); 829 830 if (ini->first_contact_local) { 831 /* QP confirmation over RoCE fabric */ 832 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 833 reason_code = smcr_clnt_conf_first_link(smc); 834 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 835 if (reason_code) 836 goto connect_abort; 837 } 838 mutex_unlock(&smc_client_lgr_pending); 839 840 smc_copy_sock_settings_to_clc(smc); 841 smc->connect_nonblock = 0; 842 if (smc->sk.sk_state == SMC_INIT) 843 smc->sk.sk_state = SMC_ACTIVE; 844 845 return 0; 846connect_abort: 847 smc_connect_abort(smc, ini->first_contact_local); 848 mutex_unlock(&smc_client_lgr_pending); 849 smc->connect_nonblock = 0; 850 851 return reason_code; 852} 853 854/* The server has chosen one of the proposed ISM devices for the communication. 855 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen. 856 */ 857static int 858smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc, 859 struct smc_init_info *ini) 860{ 861 int i; 862 863 for (i = 0; i < ini->ism_offered_cnt + 1; i++) { 864 if (ini->ism_chid[i] == ntohs(aclc->chid)) { 865 ini->ism_selected = i; 866 return 0; 867 } 868 } 869 870 return -EPROTO; 871} 872 873/* setup for ISM connection of client */ 874static int smc_connect_ism(struct smc_sock *smc, 875 struct smc_clc_msg_accept_confirm *aclc, 876 struct smc_init_info *ini) 877{ 878 int rc = 0; 879 880 ini->is_smcd = true; 881 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK; 882 883 if (aclc->hdr.version == SMC_V2) { 884 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 = 885 (struct smc_clc_msg_accept_confirm_v2 *)aclc; 886 887 rc = smc_v2_determine_accepted_chid(aclc_v2, ini); 888 if (rc) 889 return rc; 890 } 891 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid; 892 893 /* there is only one lgr role for SMC-D; use server lock */ 894 mutex_lock(&smc_server_lgr_pending); 895 rc = smc_conn_create(smc, ini); 896 if (rc) { 897 mutex_unlock(&smc_server_lgr_pending); 898 return rc; 899 } 900 901 /* Create send and receive buffers */ 902 rc = smc_buf_create(smc, true); 903 if (rc) { 904 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM; 905 goto connect_abort; 906 } 907 908 smc_conn_save_peer_info(smc, aclc); 909 smc_close_init(smc); 910 smc_rx_init(smc); 911 smc_tx_init(smc); 912 913 rc = smc_clc_send_confirm(smc, ini->first_contact_local, 914 aclc->hdr.version); 915 if (rc) 916 goto connect_abort; 917 mutex_unlock(&smc_server_lgr_pending); 918 919 smc_copy_sock_settings_to_clc(smc); 920 smc->connect_nonblock = 0; 921 if (smc->sk.sk_state == SMC_INIT) 922 smc->sk.sk_state = SMC_ACTIVE; 923 924 return 0; 925connect_abort: 926 smc_connect_abort(smc, ini->first_contact_local); 927 mutex_unlock(&smc_server_lgr_pending); 928 smc->connect_nonblock = 0; 929 930 return rc; 931} 932 933/* check if received accept type and version matches a proposed one */ 934static int smc_connect_check_aclc(struct smc_init_info *ini, 935 struct smc_clc_msg_accept_confirm *aclc) 936{ 937 if ((aclc->hdr.typev1 == SMC_TYPE_R && 938 !smcr_indicated(ini->smc_type_v1)) || 939 (aclc->hdr.typev1 == SMC_TYPE_D && 940 ((!smcd_indicated(ini->smc_type_v1) && 941 !smcd_indicated(ini->smc_type_v2)) || 942 (aclc->hdr.version == SMC_V1 && 943 !smcd_indicated(ini->smc_type_v1)) || 944 (aclc->hdr.version == SMC_V2 && 945 !smcd_indicated(ini->smc_type_v2))))) 946 return SMC_CLC_DECL_MODEUNSUPP; 947 948 return 0; 949} 950 951/* perform steps before actually connecting */ 952static int __smc_connect(struct smc_sock *smc) 953{ 954 u8 version = smc_ism_v2_capable ? SMC_V2 : SMC_V1; 955 struct smc_clc_msg_accept_confirm_v2 *aclc2; 956 struct smc_clc_msg_accept_confirm *aclc; 957 struct smc_init_info *ini = NULL; 958 u8 *buf = NULL; 959 int rc = 0; 960 961 if (smc->use_fallback) 962 return smc_connect_fallback(smc, smc->fallback_rsn); 963 964 /* if peer has not signalled SMC-capability, fall back */ 965 if (!tcp_sk(smc->clcsock->sk)->syn_smc) 966 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); 967 968 /* IPSec connections opt out of SMC optimizations */ 969 if (using_ipsec(smc)) 970 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC, 971 version); 972 973 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 974 if (!ini) 975 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM, 976 version); 977 978 ini->smcd_version = SMC_V1; 979 ini->smcd_version |= smc_ism_v2_capable ? SMC_V2 : 0; 980 ini->smc_type_v1 = SMC_TYPE_B; 981 ini->smc_type_v2 = smc_ism_v2_capable ? SMC_TYPE_D : SMC_TYPE_N; 982 983 /* get vlan id from IP device */ 984 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) { 985 ini->smcd_version &= ~SMC_V1; 986 ini->smc_type_v1 = SMC_TYPE_N; 987 if (!ini->smcd_version) { 988 rc = SMC_CLC_DECL_GETVLANERR; 989 goto fallback; 990 } 991 } 992 993 rc = smc_find_proposal_devices(smc, ini); 994 if (rc) 995 goto fallback; 996 997 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL); 998 if (!buf) { 999 rc = SMC_CLC_DECL_MEM; 1000 goto fallback; 1001 } 1002 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf; 1003 aclc = (struct smc_clc_msg_accept_confirm *)aclc2; 1004 1005 /* perform CLC handshake */ 1006 rc = smc_connect_clc(smc, aclc2, ini); 1007 if (rc) 1008 goto vlan_cleanup; 1009 1010 /* check if smc modes and versions of CLC proposal and accept match */ 1011 rc = smc_connect_check_aclc(ini, aclc); 1012 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2; 1013 ini->smcd_version = version; 1014 if (rc) 1015 goto vlan_cleanup; 1016 1017 /* depending on previous steps, connect using rdma or ism */ 1018 if (aclc->hdr.typev1 == SMC_TYPE_R) 1019 rc = smc_connect_rdma(smc, aclc, ini); 1020 else if (aclc->hdr.typev1 == SMC_TYPE_D) 1021 rc = smc_connect_ism(smc, aclc, ini); 1022 if (rc) 1023 goto vlan_cleanup; 1024 1025 smc_connect_ism_vlan_cleanup(smc, ini); 1026 kfree(buf); 1027 kfree(ini); 1028 return 0; 1029 1030vlan_cleanup: 1031 smc_connect_ism_vlan_cleanup(smc, ini); 1032 kfree(buf); 1033fallback: 1034 kfree(ini); 1035 return smc_connect_decline_fallback(smc, rc, version); 1036} 1037 1038static void smc_connect_work(struct work_struct *work) 1039{ 1040 struct smc_sock *smc = container_of(work, struct smc_sock, 1041 connect_work); 1042 long timeo = smc->sk.sk_sndtimeo; 1043 int rc = 0; 1044 1045 if (!timeo) 1046 timeo = MAX_SCHEDULE_TIMEOUT; 1047 lock_sock(smc->clcsock->sk); 1048 if (smc->clcsock->sk->sk_err) { 1049 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1050 } else if ((1 << smc->clcsock->sk->sk_state) & 1051 (TCPF_SYN_SENT | TCPF_SYN_RECV)) { 1052 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); 1053 if ((rc == -EPIPE) && 1054 ((1 << smc->clcsock->sk->sk_state) & 1055 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) 1056 rc = 0; 1057 } 1058 release_sock(smc->clcsock->sk); 1059 lock_sock(&smc->sk); 1060 if (rc != 0 || smc->sk.sk_err) { 1061 smc->sk.sk_state = SMC_CLOSED; 1062 if (rc == -EPIPE || rc == -EAGAIN) 1063 smc->sk.sk_err = EPIPE; 1064 else if (rc == -ECONNREFUSED) 1065 smc->sk.sk_err = ECONNREFUSED; 1066 else if (signal_pending(current)) 1067 smc->sk.sk_err = -sock_intr_errno(timeo); 1068 sock_put(&smc->sk); /* passive closing */ 1069 goto out; 1070 } 1071 1072 rc = __smc_connect(smc); 1073 if (rc < 0) 1074 smc->sk.sk_err = -rc; 1075 1076out: 1077 if (!sock_flag(&smc->sk, SOCK_DEAD)) { 1078 if (smc->sk.sk_err) { 1079 smc->sk.sk_state_change(&smc->sk); 1080 } else { /* allow polling before and after fallback decision */ 1081 smc->clcsock->sk->sk_write_space(smc->clcsock->sk); 1082 smc->sk.sk_write_space(&smc->sk); 1083 } 1084 } 1085 release_sock(&smc->sk); 1086} 1087 1088static int smc_connect(struct socket *sock, struct sockaddr *addr, 1089 int alen, int flags) 1090{ 1091 struct sock *sk = sock->sk; 1092 struct smc_sock *smc; 1093 int rc = -EINVAL; 1094 1095 smc = smc_sk(sk); 1096 1097 /* separate smc parameter checking to be safe */ 1098 if (alen < sizeof(addr->sa_family)) 1099 goto out_err; 1100 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 1101 goto out_err; 1102 1103 lock_sock(sk); 1104 switch (sk->sk_state) { 1105 default: 1106 goto out; 1107 case SMC_ACTIVE: 1108 rc = -EISCONN; 1109 goto out; 1110 case SMC_INIT: 1111 rc = 0; 1112 break; 1113 } 1114 1115 smc_copy_sock_settings_to_clc(smc); 1116 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1117 if (smc->connect_nonblock) { 1118 rc = -EALREADY; 1119 goto out; 1120 } 1121 rc = kernel_connect(smc->clcsock, addr, alen, flags); 1122 if (rc && rc != -EINPROGRESS) 1123 goto out; 1124 1125 if (smc->use_fallback) 1126 goto out; 1127 sock_hold(&smc->sk); /* sock put in passive closing */ 1128 if (flags & O_NONBLOCK) { 1129 if (queue_work(smc_hs_wq, &smc->connect_work)) 1130 smc->connect_nonblock = 1; 1131 rc = -EINPROGRESS; 1132 } else { 1133 rc = __smc_connect(smc); 1134 if (rc < 0) 1135 goto out; 1136 else 1137 rc = 0; /* success cases including fallback */ 1138 } 1139 1140out: 1141 release_sock(sk); 1142out_err: 1143 return rc; 1144} 1145 1146static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) 1147{ 1148 struct socket *new_clcsock = NULL; 1149 struct sock *lsk = &lsmc->sk; 1150 struct sock *new_sk; 1151 int rc = -EINVAL; 1152 1153 release_sock(lsk); 1154 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); 1155 if (!new_sk) { 1156 rc = -ENOMEM; 1157 lsk->sk_err = ENOMEM; 1158 *new_smc = NULL; 1159 lock_sock(lsk); 1160 goto out; 1161 } 1162 *new_smc = smc_sk(new_sk); 1163 1164 mutex_lock(&lsmc->clcsock_release_lock); 1165 if (lsmc->clcsock) 1166 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK); 1167 mutex_unlock(&lsmc->clcsock_release_lock); 1168 lock_sock(lsk); 1169 if (rc < 0 && rc != -EAGAIN) 1170 lsk->sk_err = -rc; 1171 if (rc < 0 || lsk->sk_state == SMC_CLOSED) { 1172 new_sk->sk_prot->unhash(new_sk); 1173 if (new_clcsock) 1174 sock_release(new_clcsock); 1175 new_sk->sk_state = SMC_CLOSED; 1176 smc_sock_set_flag(new_sk, SOCK_DEAD); 1177 sock_put(new_sk); /* final */ 1178 *new_smc = NULL; 1179 goto out; 1180 } 1181 1182 /* new clcsock has inherited the smc listen-specific sk_data_ready 1183 * function; switch it back to the original sk_data_ready function 1184 */ 1185 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready; 1186 (*new_smc)->clcsock = new_clcsock; 1187out: 1188 return rc; 1189} 1190 1191/* add a just created sock to the accept queue of the listen sock as 1192 * candidate for a following socket accept call from user space 1193 */ 1194static void smc_accept_enqueue(struct sock *parent, struct sock *sk) 1195{ 1196 struct smc_sock *par = smc_sk(parent); 1197 1198 sock_hold(sk); /* sock_put in smc_accept_unlink () */ 1199 spin_lock(&par->accept_q_lock); 1200 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); 1201 spin_unlock(&par->accept_q_lock); 1202 sk_acceptq_added(parent); 1203} 1204 1205/* remove a socket from the accept queue of its parental listening socket */ 1206static void smc_accept_unlink(struct sock *sk) 1207{ 1208 struct smc_sock *par = smc_sk(sk)->listen_smc; 1209 1210 spin_lock(&par->accept_q_lock); 1211 list_del_init(&smc_sk(sk)->accept_q); 1212 spin_unlock(&par->accept_q_lock); 1213 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); 1214 sock_put(sk); /* sock_hold in smc_accept_enqueue */ 1215} 1216 1217/* remove a sock from the accept queue to bind it to a new socket created 1218 * for a socket accept call from user space 1219 */ 1220struct sock *smc_accept_dequeue(struct sock *parent, 1221 struct socket *new_sock) 1222{ 1223 struct smc_sock *isk, *n; 1224 struct sock *new_sk; 1225 1226 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { 1227 new_sk = (struct sock *)isk; 1228 1229 smc_accept_unlink(new_sk); 1230 if (new_sk->sk_state == SMC_CLOSED) { 1231 new_sk->sk_prot->unhash(new_sk); 1232 if (isk->clcsock) { 1233 sock_release(isk->clcsock); 1234 isk->clcsock = NULL; 1235 } 1236 sock_put(new_sk); /* final */ 1237 continue; 1238 } 1239 if (new_sock) { 1240 sock_graft(new_sk, new_sock); 1241 if (isk->use_fallback) { 1242 smc_sk(new_sk)->clcsock->file = new_sock->file; 1243 isk->clcsock->file->private_data = isk->clcsock; 1244 } 1245 } 1246 return new_sk; 1247 } 1248 return NULL; 1249} 1250 1251/* clean up for a created but never accepted sock */ 1252void smc_close_non_accepted(struct sock *sk) 1253{ 1254 struct smc_sock *smc = smc_sk(sk); 1255 1256 sock_hold(sk); /* sock_put below */ 1257 lock_sock(sk); 1258 if (!sk->sk_lingertime) 1259 /* wait for peer closing */ 1260 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; 1261 __smc_release(smc); 1262 release_sock(sk); 1263 sock_put(sk); /* sock_hold above */ 1264 sock_put(sk); /* final sock_put */ 1265} 1266 1267static int smcr_serv_conf_first_link(struct smc_sock *smc) 1268{ 1269 struct smc_link *link = smc->conn.lnk; 1270 struct smc_llc_qentry *qentry; 1271 int rc; 1272 1273 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc)) 1274 return SMC_CLC_DECL_ERR_REGRMB; 1275 1276 /* send CONFIRM LINK request to client over the RoCE fabric */ 1277 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); 1278 if (rc < 0) 1279 return SMC_CLC_DECL_TIMEOUT_CL; 1280 1281 /* receive CONFIRM LINK response from client over the RoCE fabric */ 1282 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME, 1283 SMC_LLC_CONFIRM_LINK); 1284 if (!qentry) { 1285 struct smc_clc_msg_decline dclc; 1286 1287 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), 1288 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); 1289 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; 1290 } 1291 smc_llc_save_peer_uid(qentry); 1292 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP); 1293 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl); 1294 if (rc) 1295 return SMC_CLC_DECL_RMBE_EC; 1296 1297 /* confirm_rkey is implicit on 1st contact */ 1298 smc->conn.rmb_desc->is_conf_rkey = true; 1299 1300 smc_llc_link_active(link); 1301 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE); 1302 1303 /* initial contact - try to establish second link */ 1304 smc_llc_srv_add_link(link); 1305 return 0; 1306} 1307 1308/* listen worker: finish */ 1309static void smc_listen_out(struct smc_sock *new_smc) 1310{ 1311 struct smc_sock *lsmc = new_smc->listen_smc; 1312 struct sock *newsmcsk = &new_smc->sk; 1313 1314 if (lsmc->sk.sk_state == SMC_LISTEN) { 1315 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); 1316 smc_accept_enqueue(&lsmc->sk, newsmcsk); 1317 release_sock(&lsmc->sk); 1318 } else { /* no longer listening */ 1319 smc_close_non_accepted(newsmcsk); 1320 } 1321 1322 /* Wake up accept */ 1323 lsmc->sk.sk_data_ready(&lsmc->sk); 1324 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ 1325} 1326 1327/* listen worker: finish in state connected */ 1328static void smc_listen_out_connected(struct smc_sock *new_smc) 1329{ 1330 struct sock *newsmcsk = &new_smc->sk; 1331 1332 if (newsmcsk->sk_state == SMC_INIT) 1333 newsmcsk->sk_state = SMC_ACTIVE; 1334 1335 smc_listen_out(new_smc); 1336} 1337 1338/* listen worker: finish in error state */ 1339static void smc_listen_out_err(struct smc_sock *new_smc) 1340{ 1341 struct sock *newsmcsk = &new_smc->sk; 1342 1343 if (newsmcsk->sk_state == SMC_INIT) 1344 sock_put(&new_smc->sk); /* passive closing */ 1345 newsmcsk->sk_state = SMC_CLOSED; 1346 1347 smc_listen_out(new_smc); 1348} 1349 1350/* listen worker: decline and fall back if possible */ 1351static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, 1352 int local_first, u8 version) 1353{ 1354 /* RDMA setup failed, switch back to TCP */ 1355 if (local_first) 1356 smc_lgr_cleanup_early(&new_smc->conn); 1357 else 1358 smc_conn_free(&new_smc->conn); 1359 if (reason_code < 0) { /* error, no fallback possible */ 1360 smc_listen_out_err(new_smc); 1361 return; 1362 } 1363 smc_switch_to_fallback(new_smc); 1364 new_smc->fallback_rsn = reason_code; 1365 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { 1366 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) { 1367 smc_listen_out_err(new_smc); 1368 return; 1369 } 1370 } 1371 smc_listen_out_connected(new_smc); 1372} 1373 1374/* listen worker: version checking */ 1375static int smc_listen_v2_check(struct smc_sock *new_smc, 1376 struct smc_clc_msg_proposal *pclc, 1377 struct smc_init_info *ini) 1378{ 1379 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext; 1380 struct smc_clc_v2_extension *pclc_v2_ext; 1381 1382 ini->smc_type_v1 = pclc->hdr.typev1; 1383 ini->smc_type_v2 = pclc->hdr.typev2; 1384 ini->smcd_version = ini->smc_type_v1 != SMC_TYPE_N ? SMC_V1 : 0; 1385 if (pclc->hdr.version > SMC_V1) 1386 ini->smcd_version |= 1387 ini->smc_type_v2 != SMC_TYPE_N ? SMC_V2 : 0; 1388 if (!smc_ism_v2_capable) { 1389 ini->smcd_version &= ~SMC_V2; 1390 goto out; 1391 } 1392 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1393 if (!pclc_v2_ext) { 1394 ini->smcd_version &= ~SMC_V2; 1395 goto out; 1396 } 1397 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext); 1398 if (!pclc_smcd_v2_ext) 1399 ini->smcd_version &= ~SMC_V2; 1400 1401out: 1402 if (!ini->smcd_version) { 1403 if (pclc->hdr.typev1 == SMC_TYPE_B || 1404 pclc->hdr.typev2 == SMC_TYPE_B) 1405 return SMC_CLC_DECL_NOSMCDEV; 1406 if (pclc->hdr.typev1 == SMC_TYPE_D || 1407 pclc->hdr.typev2 == SMC_TYPE_D) 1408 return SMC_CLC_DECL_NOSMCDDEV; 1409 return SMC_CLC_DECL_NOSMCRDEV; 1410 } 1411 1412 return 0; 1413} 1414 1415/* listen worker: check prefixes */ 1416static int smc_listen_prfx_check(struct smc_sock *new_smc, 1417 struct smc_clc_msg_proposal *pclc) 1418{ 1419 struct smc_clc_msg_proposal_prefix *pclc_prfx; 1420 struct socket *newclcsock = new_smc->clcsock; 1421 1422 if (pclc->hdr.typev1 == SMC_TYPE_N) 1423 return 0; 1424 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 1425 if (smc_clc_prfx_match(newclcsock, pclc_prfx)) 1426 return SMC_CLC_DECL_DIFFPREFIX; 1427 1428 return 0; 1429} 1430 1431/* listen worker: initialize connection and buffers */ 1432static int smc_listen_rdma_init(struct smc_sock *new_smc, 1433 struct smc_init_info *ini) 1434{ 1435 int rc; 1436 1437 /* allocate connection / link group */ 1438 rc = smc_conn_create(new_smc, ini); 1439 if (rc) 1440 return rc; 1441 1442 /* create send buffer and rmb */ 1443 if (smc_buf_create(new_smc, false)) 1444 return SMC_CLC_DECL_MEM; 1445 1446 return 0; 1447} 1448 1449/* listen worker: initialize connection and buffers for SMC-D */ 1450static int smc_listen_ism_init(struct smc_sock *new_smc, 1451 struct smc_init_info *ini) 1452{ 1453 int rc; 1454 1455 rc = smc_conn_create(new_smc, ini); 1456 if (rc) 1457 return rc; 1458 1459 /* Create send and receive buffers */ 1460 rc = smc_buf_create(new_smc, true); 1461 if (rc) { 1462 if (ini->first_contact_local) 1463 smc_lgr_cleanup_early(&new_smc->conn); 1464 else 1465 smc_conn_free(&new_smc->conn); 1466 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : 1467 SMC_CLC_DECL_MEM; 1468 } 1469 1470 return 0; 1471} 1472 1473static bool smc_is_already_selected(struct smcd_dev *smcd, 1474 struct smc_init_info *ini, 1475 int matches) 1476{ 1477 int i; 1478 1479 for (i = 0; i < matches; i++) 1480 if (smcd == ini->ism_dev[i]) 1481 return true; 1482 1483 return false; 1484} 1485 1486/* check for ISM devices matching proposed ISM devices */ 1487static void smc_check_ism_v2_match(struct smc_init_info *ini, 1488 u16 proposed_chid, u64 proposed_gid, 1489 unsigned int *matches) 1490{ 1491 struct smcd_dev *smcd; 1492 1493 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1494 if (smcd->going_away) 1495 continue; 1496 if (smc_is_already_selected(smcd, ini, *matches)) 1497 continue; 1498 if (smc_ism_get_chid(smcd) == proposed_chid && 1499 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) { 1500 ini->ism_peer_gid[*matches] = proposed_gid; 1501 ini->ism_dev[*matches] = smcd; 1502 (*matches)++; 1503 break; 1504 } 1505 } 1506} 1507 1508static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, 1509 struct smc_clc_msg_proposal *pclc, 1510 struct smc_init_info *ini) 1511{ 1512 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 1513 struct smc_clc_v2_extension *smc_v2_ext; 1514 struct smc_clc_msg_smcd *pclc_smcd; 1515 unsigned int matches = 0; 1516 u8 smcd_version; 1517 u8 *eid = NULL; 1518 int i; 1519 1520 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2)) 1521 goto not_found; 1522 1523 pclc_smcd = smc_get_clc_msg_smcd(pclc); 1524 smc_v2_ext = smc_get_clc_v2_ext(pclc); 1525 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); 1526 if (!smcd_v2_ext || 1527 !smc_v2_ext->hdr.flag.seid) /* no system EID support for SMCD */ 1528 goto not_found; 1529 1530 mutex_lock(&smcd_dev_list.mutex); 1531 if (pclc_smcd->ism.chid) 1532 /* check for ISM device matching proposed native ISM device */ 1533 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid), 1534 ntohll(pclc_smcd->ism.gid), &matches); 1535 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) { 1536 /* check for ISM devices matching proposed non-native ISM 1537 * devices 1538 */ 1539 smc_check_ism_v2_match(ini, 1540 ntohs(smcd_v2_ext->gidchid[i - 1].chid), 1541 ntohll(smcd_v2_ext->gidchid[i - 1].gid), 1542 &matches); 1543 } 1544 mutex_unlock(&smcd_dev_list.mutex); 1545 1546 if (ini->ism_dev[0]) { 1547 smc_ism_get_system_eid(ini->ism_dev[0], &eid); 1548 if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN)) 1549 goto not_found; 1550 } else { 1551 goto not_found; 1552 } 1553 1554 /* separate - outside the smcd_dev_list.lock */ 1555 smcd_version = ini->smcd_version; 1556 for (i = 0; i < matches; i++) { 1557 ini->smcd_version = SMC_V2; 1558 ini->is_smcd = true; 1559 ini->ism_selected = i; 1560 if (smc_listen_ism_init(new_smc, ini)) 1561 /* try next active ISM device */ 1562 continue; 1563 return; /* matching and usable V2 ISM device found */ 1564 } 1565 /* no V2 ISM device could be initialized */ 1566 ini->smcd_version = smcd_version; /* restore original value */ 1567 1568not_found: 1569 ini->smcd_version &= ~SMC_V2; 1570 ini->ism_dev[0] = NULL; 1571 ini->is_smcd = false; 1572} 1573 1574static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc, 1575 struct smc_clc_msg_proposal *pclc, 1576 struct smc_init_info *ini) 1577{ 1578 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc); 1579 1580 /* check if ISM V1 is available */ 1581 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1)) 1582 goto not_found; 1583 ini->is_smcd = true; /* prepare ISM check */ 1584 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid); 1585 if (smc_find_ism_device(new_smc, ini)) 1586 goto not_found; 1587 ini->ism_selected = 0; 1588 if (!smc_listen_ism_init(new_smc, ini)) 1589 return; /* V1 ISM device found */ 1590 1591not_found: 1592 ini->ism_dev[0] = NULL; 1593 ini->is_smcd = false; 1594} 1595 1596/* listen worker: register buffers */ 1597static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first) 1598{ 1599 struct smc_connection *conn = &new_smc->conn; 1600 1601 if (!local_first) { 1602 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc)) 1603 return SMC_CLC_DECL_ERR_REGRMB; 1604 } 1605 smc_rmb_sync_sg_for_device(&new_smc->conn); 1606 1607 return 0; 1608} 1609 1610static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc, 1611 struct smc_clc_msg_proposal *pclc, 1612 struct smc_init_info *ini) 1613{ 1614 int rc; 1615 1616 if (!smcr_indicated(ini->smc_type_v1)) 1617 return SMC_CLC_DECL_NOSMCDEV; 1618 1619 /* prepare RDMA check */ 1620 ini->ib_lcl = &pclc->lcl; 1621 rc = smc_find_rdma_device(new_smc, ini); 1622 if (rc) { 1623 /* no RDMA device found */ 1624 if (ini->smc_type_v1 == SMC_TYPE_B) 1625 /* neither ISM nor RDMA device found */ 1626 rc = SMC_CLC_DECL_NOSMCDEV; 1627 return rc; 1628 } 1629 rc = smc_listen_rdma_init(new_smc, ini); 1630 if (rc) 1631 return rc; 1632 return smc_listen_rdma_reg(new_smc, ini->first_contact_local); 1633} 1634 1635/* determine the local device matching to proposal */ 1636static int smc_listen_find_device(struct smc_sock *new_smc, 1637 struct smc_clc_msg_proposal *pclc, 1638 struct smc_init_info *ini) 1639{ 1640 int rc; 1641 1642 /* check for ISM device matching V2 proposed device */ 1643 smc_find_ism_v2_device_serv(new_smc, pclc, ini); 1644 if (ini->ism_dev[0]) 1645 return 0; 1646 1647 if (!(ini->smcd_version & SMC_V1)) 1648 return SMC_CLC_DECL_NOSMCDEV; 1649 1650 /* check for matching IP prefix and subnet length */ 1651 rc = smc_listen_prfx_check(new_smc, pclc); 1652 if (rc) 1653 return rc; 1654 1655 /* get vlan id from IP device */ 1656 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini)) 1657 return SMC_CLC_DECL_GETVLANERR; 1658 1659 /* check for ISM device matching V1 proposed device */ 1660 smc_find_ism_v1_device_serv(new_smc, pclc, ini); 1661 if (ini->ism_dev[0]) 1662 return 0; 1663 1664 if (pclc->hdr.typev1 == SMC_TYPE_D) 1665 return SMC_CLC_DECL_NOSMCDDEV; /* skip RDMA and decline */ 1666 1667 /* check if RDMA is available */ 1668 return smc_find_rdma_v1_device_serv(new_smc, pclc, ini); 1669} 1670 1671/* listen worker: finish RDMA setup */ 1672static int smc_listen_rdma_finish(struct smc_sock *new_smc, 1673 struct smc_clc_msg_accept_confirm *cclc, 1674 bool local_first) 1675{ 1676 struct smc_link *link = new_smc->conn.lnk; 1677 int reason_code = 0; 1678 1679 if (local_first) 1680 smc_link_save_peer_info(link, cclc); 1681 1682 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) 1683 return SMC_CLC_DECL_ERR_RTOK; 1684 1685 if (local_first) { 1686 if (smc_ib_ready_link(link)) 1687 return SMC_CLC_DECL_ERR_RDYLNK; 1688 /* QP confirmation over RoCE fabric */ 1689 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK); 1690 reason_code = smcr_serv_conf_first_link(new_smc); 1691 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl); 1692 } 1693 return reason_code; 1694} 1695 1696/* setup for connection of server */ 1697static void smc_listen_work(struct work_struct *work) 1698{ 1699 struct smc_sock *new_smc = container_of(work, struct smc_sock, 1700 smc_listen_work); 1701 u8 version = smc_ism_v2_capable ? SMC_V2 : SMC_V1; 1702 struct socket *newclcsock = new_smc->clcsock; 1703 struct smc_clc_msg_accept_confirm *cclc; 1704 struct smc_clc_msg_proposal_area *buf; 1705 struct smc_clc_msg_proposal *pclc; 1706 struct smc_init_info *ini = NULL; 1707 int rc = 0; 1708 1709 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN) 1710 return smc_listen_out_err(new_smc); 1711 1712 if (new_smc->use_fallback) { 1713 smc_listen_out_connected(new_smc); 1714 return; 1715 } 1716 1717 /* check if peer is smc capable */ 1718 if (!tcp_sk(newclcsock->sk)->syn_smc) { 1719 smc_switch_to_fallback(new_smc); 1720 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; 1721 smc_listen_out_connected(new_smc); 1722 return; 1723 } 1724 1725 /* do inband token exchange - 1726 * wait for and receive SMC Proposal CLC message 1727 */ 1728 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 1729 if (!buf) { 1730 rc = SMC_CLC_DECL_MEM; 1731 goto out_decl; 1732 } 1733 pclc = (struct smc_clc_msg_proposal *)buf; 1734 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf), 1735 SMC_CLC_PROPOSAL, CLC_WAIT_TIME); 1736 if (rc) 1737 goto out_decl; 1738 version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version; 1739 1740 /* IPSec connections opt out of SMC optimizations */ 1741 if (using_ipsec(new_smc)) { 1742 rc = SMC_CLC_DECL_IPSEC; 1743 goto out_decl; 1744 } 1745 1746 ini = kzalloc(sizeof(*ini), GFP_KERNEL); 1747 if (!ini) { 1748 rc = SMC_CLC_DECL_MEM; 1749 goto out_decl; 1750 } 1751 1752 /* initial version checking */ 1753 rc = smc_listen_v2_check(new_smc, pclc, ini); 1754 if (rc) 1755 goto out_decl; 1756 1757 mutex_lock(&smc_server_lgr_pending); 1758 smc_close_init(new_smc); 1759 smc_rx_init(new_smc); 1760 smc_tx_init(new_smc); 1761 1762 /* determine ISM or RoCE device used for connection */ 1763 rc = smc_listen_find_device(new_smc, pclc, ini); 1764 if (rc) 1765 goto out_unlock; 1766 1767 /* send SMC Accept CLC message */ 1768 rc = smc_clc_send_accept(new_smc, ini->first_contact_local, 1769 ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1); 1770 if (rc) 1771 goto out_unlock; 1772 1773 /* SMC-D does not need this lock any more */ 1774 if (ini->is_smcd) 1775 mutex_unlock(&smc_server_lgr_pending); 1776 1777 /* receive SMC Confirm CLC message */ 1778 memset(buf, 0, sizeof(*buf)); 1779 cclc = (struct smc_clc_msg_accept_confirm *)buf; 1780 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf), 1781 SMC_CLC_CONFIRM, CLC_WAIT_TIME); 1782 if (rc) { 1783 if (!ini->is_smcd) 1784 goto out_unlock; 1785 goto out_decl; 1786 } 1787 1788 /* finish worker */ 1789 if (!ini->is_smcd) { 1790 rc = smc_listen_rdma_finish(new_smc, cclc, 1791 ini->first_contact_local); 1792 if (rc) 1793 goto out_unlock; 1794 mutex_unlock(&smc_server_lgr_pending); 1795 } 1796 smc_conn_save_peer_info(new_smc, cclc); 1797 smc_listen_out_connected(new_smc); 1798 goto out_free; 1799 1800out_unlock: 1801 mutex_unlock(&smc_server_lgr_pending); 1802out_decl: 1803 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0, 1804 version); 1805out_free: 1806 kfree(ini); 1807 kfree(buf); 1808} 1809 1810static void smc_tcp_listen_work(struct work_struct *work) 1811{ 1812 struct smc_sock *lsmc = container_of(work, struct smc_sock, 1813 tcp_listen_work); 1814 struct sock *lsk = &lsmc->sk; 1815 struct smc_sock *new_smc; 1816 int rc = 0; 1817 1818 lock_sock(lsk); 1819 while (lsk->sk_state == SMC_LISTEN) { 1820 rc = smc_clcsock_accept(lsmc, &new_smc); 1821 if (rc) /* clcsock accept queue empty or error */ 1822 goto out; 1823 if (!new_smc) 1824 continue; 1825 1826 new_smc->listen_smc = lsmc; 1827 new_smc->use_fallback = lsmc->use_fallback; 1828 new_smc->fallback_rsn = lsmc->fallback_rsn; 1829 sock_hold(lsk); /* sock_put in smc_listen_work */ 1830 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); 1831 smc_copy_sock_settings_to_smc(new_smc); 1832 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; 1833 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; 1834 sock_hold(&new_smc->sk); /* sock_put in passive closing */ 1835 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work)) 1836 sock_put(&new_smc->sk); 1837 } 1838 1839out: 1840 release_sock(lsk); 1841 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */ 1842} 1843 1844static void smc_clcsock_data_ready(struct sock *listen_clcsock) 1845{ 1846 struct smc_sock *lsmc; 1847 1848 lsmc = (struct smc_sock *) 1849 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY); 1850 if (!lsmc) 1851 return; 1852 lsmc->clcsk_data_ready(listen_clcsock); 1853 if (lsmc->sk.sk_state == SMC_LISTEN) { 1854 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */ 1855 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work)) 1856 sock_put(&lsmc->sk); 1857 } 1858} 1859 1860static int smc_listen(struct socket *sock, int backlog) 1861{ 1862 struct sock *sk = sock->sk; 1863 struct smc_sock *smc; 1864 int rc; 1865 1866 smc = smc_sk(sk); 1867 lock_sock(sk); 1868 1869 rc = -EINVAL; 1870 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || 1871 smc->connect_nonblock) 1872 goto out; 1873 1874 rc = 0; 1875 if (sk->sk_state == SMC_LISTEN) { 1876 sk->sk_max_ack_backlog = backlog; 1877 goto out; 1878 } 1879 /* some socket options are handled in core, so we could not apply 1880 * them to the clc socket -- copy smc socket options to clc socket 1881 */ 1882 smc_copy_sock_settings_to_clc(smc); 1883 if (!smc->use_fallback) 1884 tcp_sk(smc->clcsock->sk)->syn_smc = 1; 1885 1886 /* save original sk_data_ready function and establish 1887 * smc-specific sk_data_ready function 1888 */ 1889 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready; 1890 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready; 1891 smc->clcsock->sk->sk_user_data = 1892 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY); 1893 rc = kernel_listen(smc->clcsock, backlog); 1894 if (rc) { 1895 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready; 1896 goto out; 1897 } 1898 sk->sk_max_ack_backlog = backlog; 1899 sk->sk_ack_backlog = 0; 1900 sk->sk_state = SMC_LISTEN; 1901 1902out: 1903 release_sock(sk); 1904 return rc; 1905} 1906 1907static int smc_accept(struct socket *sock, struct socket *new_sock, 1908 int flags, bool kern) 1909{ 1910 struct sock *sk = sock->sk, *nsk; 1911 DECLARE_WAITQUEUE(wait, current); 1912 struct smc_sock *lsmc; 1913 long timeo; 1914 int rc = 0; 1915 1916 lsmc = smc_sk(sk); 1917 sock_hold(sk); /* sock_put below */ 1918 lock_sock(sk); 1919 1920 if (lsmc->sk.sk_state != SMC_LISTEN) { 1921 rc = -EINVAL; 1922 release_sock(sk); 1923 goto out; 1924 } 1925 1926 /* Wait for an incoming connection */ 1927 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 1928 add_wait_queue_exclusive(sk_sleep(sk), &wait); 1929 while (!(nsk = smc_accept_dequeue(sk, new_sock))) { 1930 set_current_state(TASK_INTERRUPTIBLE); 1931 if (!timeo) { 1932 rc = -EAGAIN; 1933 break; 1934 } 1935 release_sock(sk); 1936 timeo = schedule_timeout(timeo); 1937 /* wakeup by sk_data_ready in smc_listen_work() */ 1938 sched_annotate_sleep(); 1939 lock_sock(sk); 1940 if (signal_pending(current)) { 1941 rc = sock_intr_errno(timeo); 1942 break; 1943 } 1944 } 1945 set_current_state(TASK_RUNNING); 1946 remove_wait_queue(sk_sleep(sk), &wait); 1947 1948 if (!rc) 1949 rc = sock_error(nsk); 1950 release_sock(sk); 1951 if (rc) 1952 goto out; 1953 1954 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { 1955 /* wait till data arrives on the socket */ 1956 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * 1957 MSEC_PER_SEC); 1958 if (smc_sk(nsk)->use_fallback) { 1959 struct sock *clcsk = smc_sk(nsk)->clcsock->sk; 1960 1961 lock_sock(clcsk); 1962 if (skb_queue_empty(&clcsk->sk_receive_queue)) 1963 sk_wait_data(clcsk, &timeo, NULL); 1964 release_sock(clcsk); 1965 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { 1966 lock_sock(nsk); 1967 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); 1968 release_sock(nsk); 1969 } 1970 } 1971 1972out: 1973 sock_put(sk); /* sock_hold above */ 1974 return rc; 1975} 1976 1977static int smc_getname(struct socket *sock, struct sockaddr *addr, 1978 int peer) 1979{ 1980 struct smc_sock *smc; 1981 1982 if (peer && (sock->sk->sk_state != SMC_ACTIVE) && 1983 (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) 1984 return -ENOTCONN; 1985 1986 smc = smc_sk(sock->sk); 1987 1988 return smc->clcsock->ops->getname(smc->clcsock, addr, peer); 1989} 1990 1991static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1992{ 1993 struct sock *sk = sock->sk; 1994 struct smc_sock *smc; 1995 int rc; 1996 1997 smc = smc_sk(sk); 1998 lock_sock(sk); 1999 2000 /* SMC does not support connect with fastopen */ 2001 if (msg->msg_flags & MSG_FASTOPEN) { 2002 /* not connected yet, fallback */ 2003 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2004 smc_switch_to_fallback(smc); 2005 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 2006 } else { 2007 rc = -EINVAL; 2008 goto out; 2009 } 2010 } else if ((sk->sk_state != SMC_ACTIVE) && 2011 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2012 (sk->sk_state != SMC_INIT)) { 2013 rc = -EPIPE; 2014 goto out; 2015 } 2016 2017 if (smc->use_fallback) 2018 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); 2019 else 2020 rc = smc_tx_sendmsg(smc, msg, len); 2021out: 2022 release_sock(sk); 2023 return rc; 2024} 2025 2026static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 2027 int flags) 2028{ 2029 struct sock *sk = sock->sk; 2030 struct smc_sock *smc; 2031 int rc = -ENOTCONN; 2032 2033 smc = smc_sk(sk); 2034 lock_sock(sk); 2035 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2036 /* socket was connected before, no more data to read */ 2037 rc = 0; 2038 goto out; 2039 } 2040 if ((sk->sk_state == SMC_INIT) || 2041 (sk->sk_state == SMC_LISTEN) || 2042 (sk->sk_state == SMC_CLOSED)) 2043 goto out; 2044 2045 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2046 rc = 0; 2047 goto out; 2048 } 2049 2050 if (smc->use_fallback) { 2051 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); 2052 } else { 2053 msg->msg_namelen = 0; 2054 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); 2055 } 2056 2057out: 2058 release_sock(sk); 2059 return rc; 2060} 2061 2062static __poll_t smc_accept_poll(struct sock *parent) 2063{ 2064 struct smc_sock *isk = smc_sk(parent); 2065 __poll_t mask = 0; 2066 2067 spin_lock(&isk->accept_q_lock); 2068 if (!list_empty(&isk->accept_q)) 2069 mask = EPOLLIN | EPOLLRDNORM; 2070 spin_unlock(&isk->accept_q_lock); 2071 2072 return mask; 2073} 2074 2075static __poll_t smc_poll(struct file *file, struct socket *sock, 2076 poll_table *wait) 2077{ 2078 struct sock *sk = sock->sk; 2079 struct smc_sock *smc; 2080 __poll_t mask = 0; 2081 2082 if (!sk) 2083 return EPOLLNVAL; 2084 2085 smc = smc_sk(sock->sk); 2086 if (smc->use_fallback) { 2087 /* delegate to CLC child sock */ 2088 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); 2089 sk->sk_err = smc->clcsock->sk->sk_err; 2090 } else { 2091 if (sk->sk_state != SMC_CLOSED) 2092 sock_poll_wait(file, sock, wait); 2093 if (sk->sk_err) 2094 mask |= EPOLLERR; 2095 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 2096 (sk->sk_state == SMC_CLOSED)) 2097 mask |= EPOLLHUP; 2098 if (sk->sk_state == SMC_LISTEN) { 2099 /* woken up by sk_data_ready in smc_listen_work() */ 2100 mask |= smc_accept_poll(sk); 2101 } else if (smc->use_fallback) { /* as result of connect_work()*/ 2102 mask |= smc->clcsock->ops->poll(file, smc->clcsock, 2103 wait); 2104 sk->sk_err = smc->clcsock->sk->sk_err; 2105 } else { 2106 if ((sk->sk_state != SMC_INIT && 2107 atomic_read(&smc->conn.sndbuf_space)) || 2108 sk->sk_shutdown & SEND_SHUTDOWN) { 2109 mask |= EPOLLOUT | EPOLLWRNORM; 2110 } else { 2111 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2112 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2113 } 2114 if (atomic_read(&smc->conn.bytes_to_rcv)) 2115 mask |= EPOLLIN | EPOLLRDNORM; 2116 if (sk->sk_shutdown & RCV_SHUTDOWN) 2117 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; 2118 if (sk->sk_state == SMC_APPCLOSEWAIT1) 2119 mask |= EPOLLIN; 2120 if (smc->conn.urg_state == SMC_URG_VALID) 2121 mask |= EPOLLPRI; 2122 } 2123 } 2124 2125 return mask; 2126} 2127 2128static int smc_shutdown(struct socket *sock, int how) 2129{ 2130 struct sock *sk = sock->sk; 2131 bool do_shutdown = true; 2132 struct smc_sock *smc; 2133 int rc = -EINVAL; 2134 int old_state; 2135 int rc1 = 0; 2136 2137 smc = smc_sk(sk); 2138 2139 if ((how < SHUT_RD) || (how > SHUT_RDWR)) 2140 return rc; 2141 2142 lock_sock(sk); 2143 2144 rc = -ENOTCONN; 2145 if ((sk->sk_state != SMC_ACTIVE) && 2146 (sk->sk_state != SMC_PEERCLOSEWAIT1) && 2147 (sk->sk_state != SMC_PEERCLOSEWAIT2) && 2148 (sk->sk_state != SMC_APPCLOSEWAIT1) && 2149 (sk->sk_state != SMC_APPCLOSEWAIT2) && 2150 (sk->sk_state != SMC_APPFINCLOSEWAIT)) 2151 goto out; 2152 if (smc->use_fallback) { 2153 rc = kernel_sock_shutdown(smc->clcsock, how); 2154 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; 2155 if (sk->sk_shutdown == SHUTDOWN_MASK) { 2156 sk->sk_state = SMC_CLOSED; 2157 sock_put(sk); 2158 } 2159 goto out; 2160 } 2161 switch (how) { 2162 case SHUT_RDWR: /* shutdown in both directions */ 2163 old_state = sk->sk_state; 2164 rc = smc_close_active(smc); 2165 if (old_state == SMC_ACTIVE && 2166 sk->sk_state == SMC_PEERCLOSEWAIT1) 2167 do_shutdown = false; 2168 break; 2169 case SHUT_WR: 2170 rc = smc_close_shutdown_write(smc); 2171 break; 2172 case SHUT_RD: 2173 rc = 0; 2174 /* nothing more to do because peer is not involved */ 2175 break; 2176 } 2177 if (do_shutdown && smc->clcsock) 2178 rc1 = kernel_sock_shutdown(smc->clcsock, how); 2179 /* map sock_shutdown_cmd constants to sk_shutdown value range */ 2180 sk->sk_shutdown |= how + 1; 2181 2182out: 2183 release_sock(sk); 2184 return rc ? rc : rc1; 2185} 2186 2187static int smc_setsockopt(struct socket *sock, int level, int optname, 2188 sockptr_t optval, unsigned int optlen) 2189{ 2190 struct sock *sk = sock->sk; 2191 struct smc_sock *smc; 2192 int val, rc; 2193 2194 if (level == SOL_TCP && optname == TCP_ULP) 2195 return -EOPNOTSUPP; 2196 2197 smc = smc_sk(sk); 2198 2199 /* generic setsockopts reaching us here always apply to the 2200 * CLC socket 2201 */ 2202 if (unlikely(!smc->clcsock->ops->setsockopt)) 2203 rc = -EOPNOTSUPP; 2204 else 2205 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, 2206 optval, optlen); 2207 if (smc->clcsock->sk->sk_err) { 2208 sk->sk_err = smc->clcsock->sk->sk_err; 2209 sk->sk_error_report(sk); 2210 } 2211 2212 if (optlen < sizeof(int)) 2213 return -EINVAL; 2214 if (copy_from_sockptr(&val, optval, sizeof(int))) 2215 return -EFAULT; 2216 2217 lock_sock(sk); 2218 if (rc || smc->use_fallback) 2219 goto out; 2220 switch (optname) { 2221 case TCP_FASTOPEN: 2222 case TCP_FASTOPEN_CONNECT: 2223 case TCP_FASTOPEN_KEY: 2224 case TCP_FASTOPEN_NO_COOKIE: 2225 /* option not supported by SMC */ 2226 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { 2227 smc_switch_to_fallback(smc); 2228 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; 2229 } else { 2230 rc = -EINVAL; 2231 } 2232 break; 2233 case TCP_NODELAY: 2234 if (sk->sk_state != SMC_INIT && 2235 sk->sk_state != SMC_LISTEN && 2236 sk->sk_state != SMC_CLOSED) { 2237 if (val) 2238 mod_delayed_work(smc->conn.lgr->tx_wq, 2239 &smc->conn.tx_work, 0); 2240 } 2241 break; 2242 case TCP_CORK: 2243 if (sk->sk_state != SMC_INIT && 2244 sk->sk_state != SMC_LISTEN && 2245 sk->sk_state != SMC_CLOSED) { 2246 if (!val) 2247 mod_delayed_work(smc->conn.lgr->tx_wq, 2248 &smc->conn.tx_work, 0); 2249 } 2250 break; 2251 case TCP_DEFER_ACCEPT: 2252 smc->sockopt_defer_accept = val; 2253 break; 2254 default: 2255 break; 2256 } 2257out: 2258 release_sock(sk); 2259 2260 return rc; 2261} 2262 2263static int smc_getsockopt(struct socket *sock, int level, int optname, 2264 char __user *optval, int __user *optlen) 2265{ 2266 struct smc_sock *smc; 2267 2268 smc = smc_sk(sock->sk); 2269 /* socket options apply to the CLC socket */ 2270 if (unlikely(!smc->clcsock->ops->getsockopt)) 2271 return -EOPNOTSUPP; 2272 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, 2273 optval, optlen); 2274} 2275 2276static int smc_ioctl(struct socket *sock, unsigned int cmd, 2277 unsigned long arg) 2278{ 2279 union smc_host_cursor cons, urg; 2280 struct smc_connection *conn; 2281 struct smc_sock *smc; 2282 int answ; 2283 2284 smc = smc_sk(sock->sk); 2285 conn = &smc->conn; 2286 lock_sock(&smc->sk); 2287 if (smc->use_fallback) { 2288 if (!smc->clcsock) { 2289 release_sock(&smc->sk); 2290 return -EBADF; 2291 } 2292 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); 2293 release_sock(&smc->sk); 2294 return answ; 2295 } 2296 switch (cmd) { 2297 case SIOCINQ: /* same as FIONREAD */ 2298 if (smc->sk.sk_state == SMC_LISTEN) { 2299 release_sock(&smc->sk); 2300 return -EINVAL; 2301 } 2302 if (smc->sk.sk_state == SMC_INIT || 2303 smc->sk.sk_state == SMC_CLOSED) 2304 answ = 0; 2305 else 2306 answ = atomic_read(&smc->conn.bytes_to_rcv); 2307 break; 2308 case SIOCOUTQ: 2309 /* output queue size (not send + not acked) */ 2310 if (smc->sk.sk_state == SMC_LISTEN) { 2311 release_sock(&smc->sk); 2312 return -EINVAL; 2313 } 2314 if (smc->sk.sk_state == SMC_INIT || 2315 smc->sk.sk_state == SMC_CLOSED) 2316 answ = 0; 2317 else 2318 answ = smc->conn.sndbuf_desc->len - 2319 atomic_read(&smc->conn.sndbuf_space); 2320 break; 2321 case SIOCOUTQNSD: 2322 /* output queue size (not send only) */ 2323 if (smc->sk.sk_state == SMC_LISTEN) { 2324 release_sock(&smc->sk); 2325 return -EINVAL; 2326 } 2327 if (smc->sk.sk_state == SMC_INIT || 2328 smc->sk.sk_state == SMC_CLOSED) 2329 answ = 0; 2330 else 2331 answ = smc_tx_prepared_sends(&smc->conn); 2332 break; 2333 case SIOCATMARK: 2334 if (smc->sk.sk_state == SMC_LISTEN) { 2335 release_sock(&smc->sk); 2336 return -EINVAL; 2337 } 2338 if (smc->sk.sk_state == SMC_INIT || 2339 smc->sk.sk_state == SMC_CLOSED) { 2340 answ = 0; 2341 } else { 2342 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); 2343 smc_curs_copy(&urg, &conn->urg_curs, conn); 2344 answ = smc_curs_diff(conn->rmb_desc->len, 2345 &cons, &urg) == 1; 2346 } 2347 break; 2348 default: 2349 release_sock(&smc->sk); 2350 return -ENOIOCTLCMD; 2351 } 2352 release_sock(&smc->sk); 2353 2354 return put_user(answ, (int __user *)arg); 2355} 2356 2357static ssize_t smc_sendpage(struct socket *sock, struct page *page, 2358 int offset, size_t size, int flags) 2359{ 2360 struct sock *sk = sock->sk; 2361 struct smc_sock *smc; 2362 int rc = -EPIPE; 2363 2364 smc = smc_sk(sk); 2365 lock_sock(sk); 2366 if (sk->sk_state != SMC_ACTIVE) { 2367 release_sock(sk); 2368 goto out; 2369 } 2370 release_sock(sk); 2371 if (smc->use_fallback) 2372 rc = kernel_sendpage(smc->clcsock, page, offset, 2373 size, flags); 2374 else 2375 rc = sock_no_sendpage(sock, page, offset, size, flags); 2376 2377out: 2378 return rc; 2379} 2380 2381/* Map the affected portions of the rmbe into an spd, note the number of bytes 2382 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor 2383 * updates till whenever a respective page has been fully processed. 2384 * Note that subsequent recv() calls have to wait till all splice() processing 2385 * completed. 2386 */ 2387static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 2388 struct pipe_inode_info *pipe, size_t len, 2389 unsigned int flags) 2390{ 2391 struct sock *sk = sock->sk; 2392 struct smc_sock *smc; 2393 int rc = -ENOTCONN; 2394 2395 smc = smc_sk(sk); 2396 lock_sock(sk); 2397 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { 2398 /* socket was connected before, no more data to read */ 2399 rc = 0; 2400 goto out; 2401 } 2402 if (sk->sk_state == SMC_INIT || 2403 sk->sk_state == SMC_LISTEN || 2404 sk->sk_state == SMC_CLOSED) 2405 goto out; 2406 2407 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { 2408 rc = 0; 2409 goto out; 2410 } 2411 2412 if (smc->use_fallback) { 2413 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, 2414 pipe, len, flags); 2415 } else { 2416 if (*ppos) { 2417 rc = -ESPIPE; 2418 goto out; 2419 } 2420 if (flags & SPLICE_F_NONBLOCK) 2421 flags = MSG_DONTWAIT; 2422 else 2423 flags = 0; 2424 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); 2425 } 2426out: 2427 release_sock(sk); 2428 2429 return rc; 2430} 2431 2432/* must look like tcp */ 2433static const struct proto_ops smc_sock_ops = { 2434 .family = PF_SMC, 2435 .owner = THIS_MODULE, 2436 .release = smc_release, 2437 .bind = smc_bind, 2438 .connect = smc_connect, 2439 .socketpair = sock_no_socketpair, 2440 .accept = smc_accept, 2441 .getname = smc_getname, 2442 .poll = smc_poll, 2443 .ioctl = smc_ioctl, 2444 .listen = smc_listen, 2445 .shutdown = smc_shutdown, 2446 .setsockopt = smc_setsockopt, 2447 .getsockopt = smc_getsockopt, 2448 .sendmsg = smc_sendmsg, 2449 .recvmsg = smc_recvmsg, 2450 .mmap = sock_no_mmap, 2451 .sendpage = smc_sendpage, 2452 .splice_read = smc_splice_read, 2453}; 2454 2455static int smc_create(struct net *net, struct socket *sock, int protocol, 2456 int kern) 2457{ 2458 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; 2459 struct smc_sock *smc; 2460 struct sock *sk; 2461 int rc; 2462 2463 rc = -ESOCKTNOSUPPORT; 2464 if (sock->type != SOCK_STREAM) 2465 goto out; 2466 2467 rc = -EPROTONOSUPPORT; 2468 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) 2469 goto out; 2470 2471 rc = -ENOBUFS; 2472 sock->ops = &smc_sock_ops; 2473 sk = smc_sock_alloc(net, sock, protocol); 2474 if (!sk) 2475 goto out; 2476 2477 /* create internal TCP socket for CLC handshake and fallback */ 2478 smc = smc_sk(sk); 2479 smc->use_fallback = false; /* assume rdma capability first */ 2480 smc->fallback_rsn = 0; 2481 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, 2482 &smc->clcsock); 2483 if (rc) { 2484 sk_common_release(sk); 2485 goto out; 2486 } 2487 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); 2488 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); 2489 2490out: 2491 return rc; 2492} 2493 2494static const struct net_proto_family smc_sock_family_ops = { 2495 .family = PF_SMC, 2496 .owner = THIS_MODULE, 2497 .create = smc_create, 2498}; 2499 2500unsigned int smc_net_id; 2501 2502static __net_init int smc_net_init(struct net *net) 2503{ 2504 return smc_pnet_net_init(net); 2505} 2506 2507static void __net_exit smc_net_exit(struct net *net) 2508{ 2509 smc_pnet_net_exit(net); 2510} 2511 2512static struct pernet_operations smc_net_ops = { 2513 .init = smc_net_init, 2514 .exit = smc_net_exit, 2515 .id = &smc_net_id, 2516 .size = sizeof(struct smc_net), 2517}; 2518 2519static int __init smc_init(void) 2520{ 2521 int rc; 2522 2523 rc = register_pernet_subsys(&smc_net_ops); 2524 if (rc) 2525 return rc; 2526 2527 smc_ism_init(); 2528 smc_clc_init(); 2529 2530 rc = smc_pnet_init(); 2531 if (rc) 2532 goto out_pernet_subsys; 2533 2534 rc = -ENOMEM; 2535 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0); 2536 if (!smc_hs_wq) 2537 goto out_pnet; 2538 2539 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0); 2540 if (!smc_close_wq) 2541 goto out_alloc_hs_wq; 2542 2543 rc = smc_core_init(); 2544 if (rc) { 2545 pr_err("%s: smc_core_init fails with %d\n", __func__, rc); 2546 goto out_alloc_wqs; 2547 } 2548 2549 rc = smc_llc_init(); 2550 if (rc) { 2551 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); 2552 goto out_core; 2553 } 2554 2555 rc = smc_cdc_init(); 2556 if (rc) { 2557 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); 2558 goto out_core; 2559 } 2560 2561 rc = proto_register(&smc_proto, 1); 2562 if (rc) { 2563 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); 2564 goto out_core; 2565 } 2566 2567 rc = proto_register(&smc_proto6, 1); 2568 if (rc) { 2569 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); 2570 goto out_proto; 2571 } 2572 2573 rc = sock_register(&smc_sock_family_ops); 2574 if (rc) { 2575 pr_err("%s: sock_register fails with %d\n", __func__, rc); 2576 goto out_proto6; 2577 } 2578 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); 2579 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); 2580 2581 rc = smc_ib_register_client(); 2582 if (rc) { 2583 pr_err("%s: ib_register fails with %d\n", __func__, rc); 2584 goto out_sock; 2585 } 2586 2587 static_branch_enable(&tcp_have_smc); 2588 return 0; 2589 2590out_sock: 2591 sock_unregister(PF_SMC); 2592out_proto6: 2593 proto_unregister(&smc_proto6); 2594out_proto: 2595 proto_unregister(&smc_proto); 2596out_core: 2597 smc_core_exit(); 2598out_alloc_wqs: 2599 destroy_workqueue(smc_close_wq); 2600out_alloc_hs_wq: 2601 destroy_workqueue(smc_hs_wq); 2602out_pnet: 2603 smc_pnet_exit(); 2604out_pernet_subsys: 2605 unregister_pernet_subsys(&smc_net_ops); 2606 2607 return rc; 2608} 2609 2610static void __exit smc_exit(void) 2611{ 2612 static_branch_disable(&tcp_have_smc); 2613 sock_unregister(PF_SMC); 2614 smc_core_exit(); 2615 smc_ib_unregister_client(); 2616 destroy_workqueue(smc_close_wq); 2617 destroy_workqueue(smc_hs_wq); 2618 proto_unregister(&smc_proto6); 2619 proto_unregister(&smc_proto); 2620 smc_pnet_exit(); 2621 unregister_pernet_subsys(&smc_net_ops); 2622 rcu_barrier(); 2623} 2624 2625module_init(smc_init); 2626module_exit(smc_exit); 2627 2628MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); 2629MODULE_DESCRIPTION("smc socket address family"); 2630MODULE_LICENSE("GPL"); 2631MODULE_ALIAS_NETPROTO(PF_SMC); 2632