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