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