net/smc/af_smc.c

   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 #include <linux/splice.h>
  31
  32 #include <net/sock.h>
  33 #include <net/tcp.h>
  34 #include <net/smc.h>
  35 #include <asm/ioctls.h>
  36
  37 #include <net/net_namespace.h>
  38 #include <net/netns/generic.h>
  39 #include "smc_netns.h"
  40
  41 #include "smc.h"
  42 #include "smc_clc.h"
  43 #include "smc_llc.h"
  44 #include "smc_cdc.h"
  45 #include "smc_core.h"
  46 #include "smc_ib.h"
  47 #include "smc_ism.h"
  48 #include "smc_pnet.h"
  49 #include "smc_netlink.h"
  50 #include "smc_tx.h"
  51 #include "smc_rx.h"
  52 #include "smc_close.h"
  53 #include "smc_stats.h"
  54 #include "smc_tracepoint.h"
  55 #include "smc_sysctl.h"
  56
  57 static DEFINE_MUTEX(smc_server_lgr_pending);    /* serialize link group
  58                                                  * creation on server
  59                                                  */
  60 static DEFINE_MUTEX(smc_client_lgr_pending);    /* serialize link group
  61                                                  * creation on client
  62                                                  */
  63
  64 static struct workqueue_struct  *smc_tcp_ls_wq; /* wq for tcp listen work */
  65 struct workqueue_struct *smc_hs_wq;     /* wq for handshake work */
  66 struct workqueue_struct *smc_close_wq;  /* wq for close work */
  67
  68 static void smc_tcp_listen_work(struct work_struct *);
  69 static void smc_connect_work(struct work_struct *);
  70
  71 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb)
  72 {
  73         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
  74         void *hdr;
  75
  76         if (cb_ctx->pos[0])
  77                 goto out;
  78
  79         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  80                           &smc_gen_nl_family, NLM_F_MULTI,
  81                           SMC_NETLINK_DUMP_HS_LIMITATION);
  82         if (!hdr)
  83                 return -ENOMEM;
  84
  85         if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED,
  86                        sock_net(skb->sk)->smc.limit_smc_hs))
  87                 goto err;
  88
  89         genlmsg_end(skb, hdr);
  90         cb_ctx->pos[0] = 1;
  91 out:
  92         return skb->len;
  93 err:
  94         genlmsg_cancel(skb, hdr);
  95         return -EMSGSIZE;
  96 }
  97
  98 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
  99 {
 100         sock_net(skb->sk)->smc.limit_smc_hs = true;
 101         return 0;
 102 }
 103
 104 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
 105 {
 106         sock_net(skb->sk)->smc.limit_smc_hs = false;
 107         return 0;
 108 }
 109
 110 static void smc_set_keepalive(struct sock *sk, int val)
 111 {
 112         struct smc_sock *smc = smc_sk(sk);
 113
 114         smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
 115 }
 116
 117 static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk,
 118                                           struct sk_buff *skb,
 119                                           struct request_sock *req,
 120                                           struct dst_entry *dst,
 121                                           struct request_sock *req_unhash,
 122                                           bool *own_req)
 123 {
 124         struct smc_sock *smc;
 125         struct sock *child;
 126
 127         smc = smc_clcsock_user_data(sk);
 128
 129         if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) >
 130                                 sk->sk_max_ack_backlog)
 131                 goto drop;
 132
 133         if (sk_acceptq_is_full(&smc->sk)) {
 134                 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 135                 goto drop;
 136         }
 137
 138         /* passthrough to original syn recv sock fct */
 139         child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash,
 140                                                own_req);
 141         /* child must not inherit smc or its ops */
 142         if (child) {
 143                 rcu_assign_sk_user_data(child, NULL);
 144
 145                 /* v4-mapped sockets don't inherit parent ops. Don't restore. */
 146                 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops)
 147                         inet_csk(child)->icsk_af_ops = smc->ori_af_ops;
 148         }
 149         return child;
 150
 151 drop:
 152         dst_release(dst);
 153         tcp_listendrop(sk);
 154         return NULL;
 155 }
 156
 157 static bool smc_hs_congested(const struct sock *sk)
 158 {
 159         const struct smc_sock *smc;
 160
 161         smc = smc_clcsock_user_data(sk);
 162
 163         if (!smc)
 164                 return true;
 165
 166         if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
 167                 return true;
 168
 169         return false;
 170 }
 171
 172 static struct smc_hashinfo smc_v4_hashinfo = {
 173         .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
 174 };
 175
 176 static struct smc_hashinfo smc_v6_hashinfo = {
 177         .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
 178 };
 179
 180 int smc_hash_sk(struct sock *sk)
 181 {
 182         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 183         struct hlist_head *head;
 184
 185         head = &h->ht;
 186
 187         write_lock_bh(&h->lock);
 188         sk_add_node(sk, head);
 189         write_unlock_bh(&h->lock);
 190         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 191
 192         return 0;
 193 }
 194 EXPORT_SYMBOL_GPL(smc_hash_sk);
 195
 196 void smc_unhash_sk(struct sock *sk)
 197 {
 198         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 199
 200         write_lock_bh(&h->lock);
 201         if (sk_del_node_init(sk))
 202                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 203         write_unlock_bh(&h->lock);
 204 }
 205 EXPORT_SYMBOL_GPL(smc_unhash_sk);
 206
 207 /* This will be called before user really release sock_lock. So do the
 208  * work which we didn't do because of user hold the sock_lock in the
 209  * BH context
 210  */
 211 static void smc_release_cb(struct sock *sk)
 212 {
 213         struct smc_sock *smc = smc_sk(sk);
 214
 215         if (smc->conn.tx_in_release_sock) {
 216                 smc_tx_pending(&smc->conn);
 217                 smc->conn.tx_in_release_sock = false;
 218         }
 219 }
 220
 221 struct proto smc_proto = {
 222         .name           = "SMC",
 223         .owner          = THIS_MODULE,
 224         .keepalive      = smc_set_keepalive,
 225         .hash           = smc_hash_sk,
 226         .unhash         = smc_unhash_sk,
 227         .release_cb     = smc_release_cb,
 228         .obj_size       = sizeof(struct smc_sock),
 229         .h.smc_hash     = &smc_v4_hashinfo,
 230         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 231 };
 232 EXPORT_SYMBOL_GPL(smc_proto);
 233
 234 struct proto smc_proto6 = {
 235         .name           = "SMC6",
 236         .owner          = THIS_MODULE,
 237         .keepalive      = smc_set_keepalive,
 238         .hash           = smc_hash_sk,
 239         .unhash         = smc_unhash_sk,
 240         .release_cb     = smc_release_cb,
 241         .obj_size       = sizeof(struct smc_sock),
 242         .h.smc_hash     = &smc_v6_hashinfo,
 243         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 244 };
 245 EXPORT_SYMBOL_GPL(smc_proto6);
 246
 247 static void smc_fback_restore_callbacks(struct smc_sock *smc)
 248 {
 249         struct sock *clcsk = smc->clcsock->sk;
 250
 251         write_lock_bh(&clcsk->sk_callback_lock);
 252         clcsk->sk_user_data = NULL;
 253
 254         smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
 255         smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
 256         smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
 257         smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
 258
 259         write_unlock_bh(&clcsk->sk_callback_lock);
 260 }
 261
 262 static void smc_restore_fallback_changes(struct smc_sock *smc)
 263 {
 264         if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
 265                 smc->clcsock->file->private_data = smc->sk.sk_socket;
 266                 smc->clcsock->file = NULL;
 267                 smc_fback_restore_callbacks(smc);
 268         }
 269 }
 270
 271 static int __smc_release(struct smc_sock *smc)
 272 {
 273         struct sock *sk = &smc->sk;
 274         int rc = 0;
 275
 276         if (!smc->use_fallback) {
 277                 rc = smc_close_active(smc);
 278                 smc_sock_set_flag(sk, SOCK_DEAD);
 279                 sk->sk_shutdown |= SHUTDOWN_MASK;
 280         } else {
 281                 if (sk->sk_state != SMC_CLOSED) {
 282                         if (sk->sk_state != SMC_LISTEN &&
 283                             sk->sk_state != SMC_INIT)
 284                                 sock_put(sk); /* passive closing */
 285                         if (sk->sk_state == SMC_LISTEN) {
 286                                 /* wake up clcsock accept */
 287                                 rc = kernel_sock_shutdown(smc->clcsock,
 288                                                           SHUT_RDWR);
 289                         }
 290                         sk->sk_state = SMC_CLOSED;
 291                         sk->sk_state_change(sk);
 292                 }
 293                 smc_restore_fallback_changes(smc);
 294         }
 295
 296         sk->sk_prot->unhash(sk);
 297
 298         if (sk->sk_state == SMC_CLOSED) {
 299                 if (smc->clcsock) {
 300                         release_sock(sk);
 301                         smc_clcsock_release(smc);
 302                         lock_sock(sk);
 303                 }
 304                 if (!smc->use_fallback)
 305                         smc_conn_free(&smc->conn);
 306         }
 307
 308         return rc;
 309 }
 310
 311 static int smc_release(struct socket *sock)
 312 {
 313         struct sock *sk = sock->sk;
 314         struct smc_sock *smc;
 315         int old_state, rc = 0;
 316
 317         if (!sk)
 318                 goto out;
 319
 320         sock_hold(sk); /* sock_put below */
 321         smc = smc_sk(sk);
 322
 323         old_state = sk->sk_state;
 324
 325         /* cleanup for a dangling non-blocking connect */
 326         if (smc->connect_nonblock && old_state == SMC_INIT)
 327                 tcp_abort(smc->clcsock->sk, ECONNABORTED);
 328
 329         if (cancel_work_sync(&smc->connect_work))
 330                 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
 331
 332         if (sk->sk_state == SMC_LISTEN)
 333                 /* smc_close_non_accepted() is called and acquires
 334                  * sock lock for child sockets again
 335                  */
 336                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 337         else
 338                 lock_sock(sk);
 339
 340         if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
 341             !smc->use_fallback)
 342                 smc_close_active_abort(smc);
 343
 344         rc = __smc_release(smc);
 345
 346         /* detach socket */
 347         sock_orphan(sk);
 348         sock->sk = NULL;
 349         release_sock(sk);
 350
 351         sock_put(sk); /* sock_hold above */
 352         sock_put(sk); /* final sock_put */
 353 out:
 354         return rc;
 355 }
 356
 357 static void smc_destruct(struct sock *sk)
 358 {
 359         if (sk->sk_state != SMC_CLOSED)
 360                 return;
 361         if (!sock_flag(sk, SOCK_DEAD))
 362                 return;
 363 }
 364
 365 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
 366                                    int protocol)
 367 {
 368         struct smc_sock *smc;
 369         struct proto *prot;
 370         struct sock *sk;
 371
 372         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
 373         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
 374         if (!sk)
 375                 return NULL;
 376
 377         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
 378         sk->sk_state = SMC_INIT;
 379         sk->sk_destruct = smc_destruct;
 380         sk->sk_protocol = protocol;
 381         WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
 382         WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
 383         smc = smc_sk(sk);
 384         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
 385         INIT_WORK(&smc->connect_work, smc_connect_work);
 386         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
 387         INIT_LIST_HEAD(&smc->accept_q);
 388         spin_lock_init(&smc->accept_q_lock);
 389         spin_lock_init(&smc->conn.send_lock);
 390         sk->sk_prot->hash(sk);
 391         mutex_init(&smc->clcsock_release_lock);
 392         smc_init_saved_callbacks(smc);
 393
 394         return sk;
 395 }
 396
 397 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
 398                     int addr_len)
 399 {
 400         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 401         struct sock *sk = sock->sk;
 402         struct smc_sock *smc;
 403         int rc;
 404
 405         smc = smc_sk(sk);
 406
 407         /* replicate tests from inet_bind(), to be safe wrt. future changes */
 408         rc = -EINVAL;
 409         if (addr_len < sizeof(struct sockaddr_in))
 410                 goto out;
 411
 412         rc = -EAFNOSUPPORT;
 413         if (addr->sin_family != AF_INET &&
 414             addr->sin_family != AF_INET6 &&
 415             addr->sin_family != AF_UNSPEC)
 416                 goto out;
 417         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
 418         if (addr->sin_family == AF_UNSPEC &&
 419             addr->sin_addr.s_addr != htonl(INADDR_ANY))
 420                 goto out;
 421
 422         lock_sock(sk);
 423
 424         /* Check if socket is already active */
 425         rc = -EINVAL;
 426         if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
 427                 goto out_rel;
 428
 429         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
 430         smc->clcsock->sk->sk_reuseport = sk->sk_reuseport;
 431         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
 432
 433 out_rel:
 434         release_sock(sk);
 435 out:
 436         return rc;
 437 }
 438
 439 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
 440  * clc socket (since smc is not called for these options from net/core)
 441  */
 442
 443 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
 444                              (1UL << SOCK_KEEPOPEN) | \
 445                              (1UL << SOCK_LINGER) | \
 446                              (1UL << SOCK_BROADCAST) | \
 447                              (1UL << SOCK_TIMESTAMP) | \
 448                              (1UL << SOCK_DBG) | \
 449                              (1UL << SOCK_RCVTSTAMP) | \
 450                              (1UL << SOCK_RCVTSTAMPNS) | \
 451                              (1UL << SOCK_LOCALROUTE) | \
 452                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
 453                              (1UL << SOCK_RXQ_OVFL) | \
 454                              (1UL << SOCK_WIFI_STATUS) | \
 455                              (1UL << SOCK_NOFCS) | \
 456                              (1UL << SOCK_FILTER_LOCKED) | \
 457                              (1UL << SOCK_TSTAMP_NEW))
 458
 459 /* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */
 460 static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk,
 461                                      unsigned long mask)
 462 {
 463         struct net *nnet = sock_net(nsk);
 464
 465         nsk->sk_userlocks = osk->sk_userlocks;
 466         if (osk->sk_userlocks & SOCK_SNDBUF_LOCK) {
 467                 nsk->sk_sndbuf = osk->sk_sndbuf;
 468         } else {
 469                 if (mask == SK_FLAGS_SMC_TO_CLC)
 470                         WRITE_ONCE(nsk->sk_sndbuf,
 471                                    READ_ONCE(nnet->ipv4.sysctl_tcp_wmem[1]));
 472                 else
 473                         WRITE_ONCE(nsk->sk_sndbuf,
 474                                    2 * READ_ONCE(nnet->smc.sysctl_wmem));
 475         }
 476         if (osk->sk_userlocks & SOCK_RCVBUF_LOCK) {
 477                 nsk->sk_rcvbuf = osk->sk_rcvbuf;
 478         } else {
 479                 if (mask == SK_FLAGS_SMC_TO_CLC)
 480                         WRITE_ONCE(nsk->sk_rcvbuf,
 481                                    READ_ONCE(nnet->ipv4.sysctl_tcp_rmem[1]));
 482                 else
 483                         WRITE_ONCE(nsk->sk_rcvbuf,
 484                                    2 * READ_ONCE(nnet->smc.sysctl_rmem));
 485         }
 486 }
 487
 488 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
 489                                    unsigned long mask)
 490 {
 491         /* options we don't get control via setsockopt for */
 492         nsk->sk_type = osk->sk_type;
 493         nsk->sk_sndtimeo = osk->sk_sndtimeo;
 494         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
 495         nsk->sk_mark = READ_ONCE(osk->sk_mark);
 496         nsk->sk_priority = osk->sk_priority;
 497         nsk->sk_rcvlowat = osk->sk_rcvlowat;
 498         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
 499         nsk->sk_err = osk->sk_err;
 500
 501         nsk->sk_flags &= ~mask;
 502         nsk->sk_flags |= osk->sk_flags & mask;
 503
 504         smc_adjust_sock_bufsizes(nsk, osk, mask);
 505 }
 506
 507 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
 508 {
 509         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
 510 }
 511
 512 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
 513                              (1UL << SOCK_KEEPOPEN) | \
 514                              (1UL << SOCK_LINGER) | \
 515                              (1UL << SOCK_DBG))
 516 /* copy only settings and flags relevant for smc from clc to smc socket */
 517 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
 518 {
 519         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
 520 }
 521
 522 /* register the new vzalloced sndbuf on all links */
 523 static int smcr_lgr_reg_sndbufs(struct smc_link *link,
 524                                 struct smc_buf_desc *snd_desc)
 525 {
 526         struct smc_link_group *lgr = link->lgr;
 527         int i, rc = 0;
 528
 529         if (!snd_desc->is_vm)
 530                 return -EINVAL;
 531
 532         /* protect against parallel smcr_link_reg_buf() */
 533         down_write(&lgr->llc_conf_mutex);
 534         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 535                 if (!smc_link_active(&lgr->lnk[i]))
 536                         continue;
 537                 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc);
 538                 if (rc)
 539                         break;
 540         }
 541         up_write(&lgr->llc_conf_mutex);
 542         return rc;
 543 }
 544
 545 /* register the new rmb on all links */
 546 static int smcr_lgr_reg_rmbs(struct smc_link *link,
 547                              struct smc_buf_desc *rmb_desc)
 548 {
 549         struct smc_link_group *lgr = link->lgr;
 550         bool do_slow = false;
 551         int i, rc = 0;
 552
 553         rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
 554         if (rc)
 555                 return rc;
 556
 557         down_read(&lgr->llc_conf_mutex);
 558         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 559                 if (!smc_link_active(&lgr->lnk[i]))
 560                         continue;
 561                 if (!rmb_desc->is_reg_mr[link->link_idx]) {
 562                         up_read(&lgr->llc_conf_mutex);
 563                         goto slow_path;
 564                 }
 565         }
 566         /* mr register already */
 567         goto fast_path;
 568 slow_path:
 569         do_slow = true;
 570         /* protect against parallel smc_llc_cli_rkey_exchange() and
 571          * parallel smcr_link_reg_buf()
 572          */
 573         down_write(&lgr->llc_conf_mutex);
 574         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 575                 if (!smc_link_active(&lgr->lnk[i]))
 576                         continue;
 577                 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc);
 578                 if (rc)
 579                         goto out;
 580         }
 581 fast_path:
 582         /* exchange confirm_rkey msg with peer */
 583         rc = smc_llc_do_confirm_rkey(link, rmb_desc);
 584         if (rc) {
 585                 rc = -EFAULT;
 586                 goto out;
 587         }
 588         rmb_desc->is_conf_rkey = true;
 589 out:
 590         do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex);
 591         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
 592         return rc;
 593 }
 594
 595 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
 596 {
 597         struct smc_link *link = smc->conn.lnk;
 598         struct smc_llc_qentry *qentry;
 599         int rc;
 600
 601         /* Receive CONFIRM LINK request from server over RoCE fabric.
 602          * Increasing the client's timeout by twice as much as the server's
 603          * timeout by default can temporarily avoid decline messages of
 604          * both sides crossing or colliding
 605          */
 606         qentry = smc_llc_wait(link->lgr, NULL, 2 * SMC_LLC_WAIT_TIME,
 607                               SMC_LLC_CONFIRM_LINK);
 608         if (!qentry) {
 609                 struct smc_clc_msg_decline dclc;
 610
 611                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 612                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 613                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
 614         }
 615         smc_llc_save_peer_uid(qentry);
 616         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
 617         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
 618         if (rc)
 619                 return SMC_CLC_DECL_RMBE_EC;
 620
 621         rc = smc_ib_modify_qp_rts(link);
 622         if (rc)
 623                 return SMC_CLC_DECL_ERR_RDYLNK;
 624
 625         smc_wr_remember_qp_attr(link);
 626
 627         /* reg the sndbuf if it was vzalloced */
 628         if (smc->conn.sndbuf_desc->is_vm) {
 629                 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
 630                         return SMC_CLC_DECL_ERR_REGBUF;
 631         }
 632
 633         /* reg the rmb */
 634         if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
 635                 return SMC_CLC_DECL_ERR_REGBUF;
 636
 637         /* confirm_rkey is implicit on 1st contact */
 638         smc->conn.rmb_desc->is_conf_rkey = true;
 639
 640         /* send CONFIRM LINK response over RoCE fabric */
 641         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
 642         if (rc < 0)
 643                 return SMC_CLC_DECL_TIMEOUT_CL;
 644
 645         smc_llc_link_active(link);
 646         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
 647
 648         if (link->lgr->max_links > 1) {
 649                 /* optional 2nd link, receive ADD LINK request from server */
 650                 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
 651                                       SMC_LLC_ADD_LINK);
 652                 if (!qentry) {
 653                         struct smc_clc_msg_decline dclc;
 654
 655                         rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 656                                               SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 657                         if (rc == -EAGAIN)
 658                                 rc = 0; /* no DECLINE received, go with one link */
 659                         return rc;
 660                 }
 661                 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
 662                 smc_llc_cli_add_link(link, qentry);
 663         }
 664         return 0;
 665 }
 666
 667 static bool smc_isascii(char *hostname)
 668 {
 669         int i;
 670
 671         for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
 672                 if (!isascii(hostname[i]))
 673                         return false;
 674         return true;
 675 }
 676
 677 static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
 678                                         struct smc_clc_msg_accept_confirm *clc)
 679 {
 680         struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
 681                 (struct smc_clc_msg_accept_confirm_v2 *)clc;
 682         struct smc_clc_first_contact_ext *fce;
 683         int clc_v2_len;
 684
 685         if (clc->hdr.version == SMC_V1 ||
 686             !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
 687                 return;
 688
 689         if (smc->conn.lgr->is_smcd) {
 690                 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid,
 691                        SMC_MAX_EID_LEN);
 692                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
 693                                          d1);
 694         } else {
 695                 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid,
 696                        SMC_MAX_EID_LEN);
 697                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
 698                                          r1);
 699         }
 700         fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len);
 701         smc->conn.lgr->peer_os = fce->os_type;
 702         smc->conn.lgr->peer_smc_release = fce->release;
 703         if (smc_isascii(fce->hostname))
 704                 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
 705                        SMC_MAX_HOSTNAME_LEN);
 706 }
 707
 708 static void smcr_conn_save_peer_info(struct smc_sock *smc,
 709                                      struct smc_clc_msg_accept_confirm *clc)
 710 {
 711         int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
 712
 713         smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
 714         smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
 715         smc->conn.peer_rmbe_size = bufsize;
 716         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 717         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
 718 }
 719
 720 static void smcd_conn_save_peer_info(struct smc_sock *smc,
 721                                      struct smc_clc_msg_accept_confirm *clc)
 722 {
 723         int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
 724
 725         smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
 726         smc->conn.peer_token = ntohll(clc->d0.token);
 727         /* msg header takes up space in the buffer */
 728         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
 729         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 730         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
 731 }
 732
 733 static void smc_conn_save_peer_info(struct smc_sock *smc,
 734                                     struct smc_clc_msg_accept_confirm *clc)
 735 {
 736         if (smc->conn.lgr->is_smcd)
 737                 smcd_conn_save_peer_info(smc, clc);
 738         else
 739                 smcr_conn_save_peer_info(smc, clc);
 740         smc_conn_save_peer_info_fce(smc, clc);
 741 }
 742
 743 static void smc_link_save_peer_info(struct smc_link *link,
 744                                     struct smc_clc_msg_accept_confirm *clc,
 745                                     struct smc_init_info *ini)
 746 {
 747         link->peer_qpn = ntoh24(clc->r0.qpn);
 748         memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
 749         memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
 750         link->peer_psn = ntoh24(clc->r0.psn);
 751         link->peer_mtu = clc->r0.qp_mtu;
 752 }
 753
 754 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
 755                                        struct smc_stats_fback *fback_arr)
 756 {
 757         int cnt;
 758
 759         for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
 760                 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
 761                         fback_arr[cnt].count++;
 762                         break;
 763                 }
 764                 if (!fback_arr[cnt].fback_code) {
 765                         fback_arr[cnt].fback_code = smc->fallback_rsn;
 766                         fback_arr[cnt].count++;
 767                         break;
 768                 }
 769         }
 770 }
 771
 772 static void smc_stat_fallback(struct smc_sock *smc)
 773 {
 774         struct net *net = sock_net(&smc->sk);
 775
 776         mutex_lock(&net->smc.mutex_fback_rsn);
 777         if (smc->listen_smc) {
 778                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
 779                 net->smc.fback_rsn->srv_fback_cnt++;
 780         } else {
 781                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
 782                 net->smc.fback_rsn->clnt_fback_cnt++;
 783         }
 784         mutex_unlock(&net->smc.mutex_fback_rsn);
 785 }
 786
 787 /* must be called under rcu read lock */
 788 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
 789 {
 790         struct socket_wq *wq;
 791         __poll_t flags;
 792
 793         wq = rcu_dereference(smc->sk.sk_wq);
 794         if (!skwq_has_sleeper(wq))
 795                 return;
 796
 797         /* wake up smc sk->sk_wq */
 798         if (!key) {
 799                 /* sk_state_change */
 800                 wake_up_interruptible_all(&wq->wait);
 801         } else {
 802                 flags = key_to_poll(key);
 803                 if (flags & (EPOLLIN | EPOLLOUT))
 804                         /* sk_data_ready or sk_write_space */
 805                         wake_up_interruptible_sync_poll(&wq->wait, flags);
 806                 else if (flags & EPOLLERR)
 807                         /* sk_error_report */
 808                         wake_up_interruptible_poll(&wq->wait, flags);
 809         }
 810 }
 811
 812 static int smc_fback_mark_woken(wait_queue_entry_t *wait,
 813                                 unsigned int mode, int sync, void *key)
 814 {
 815         struct smc_mark_woken *mark =
 816                 container_of(wait, struct smc_mark_woken, wait_entry);
 817
 818         mark->woken = true;
 819         mark->key = key;
 820         return 0;
 821 }
 822
 823 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
 824                                      void (*clcsock_callback)(struct sock *sk))
 825 {
 826         struct smc_mark_woken mark = { .woken = false };
 827         struct socket_wq *wq;
 828
 829         init_waitqueue_func_entry(&mark.wait_entry,
 830                                   smc_fback_mark_woken);
 831         rcu_read_lock();
 832         wq = rcu_dereference(clcsk->sk_wq);
 833         if (!wq)
 834                 goto out;
 835         add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 836         clcsock_callback(clcsk);
 837         remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 838
 839         if (mark.woken)
 840                 smc_fback_wakeup_waitqueue(smc, mark.key);
 841 out:
 842         rcu_read_unlock();
 843 }
 844
 845 static void smc_fback_state_change(struct sock *clcsk)
 846 {
 847         struct smc_sock *smc;
 848
 849         read_lock_bh(&clcsk->sk_callback_lock);
 850         smc = smc_clcsock_user_data(clcsk);
 851         if (smc)
 852                 smc_fback_forward_wakeup(smc, clcsk,
 853                                          smc->clcsk_state_change);
 854         read_unlock_bh(&clcsk->sk_callback_lock);
 855 }
 856
 857 static void smc_fback_data_ready(struct sock *clcsk)
 858 {
 859         struct smc_sock *smc;
 860
 861         read_lock_bh(&clcsk->sk_callback_lock);
 862         smc = smc_clcsock_user_data(clcsk);
 863         if (smc)
 864                 smc_fback_forward_wakeup(smc, clcsk,
 865                                          smc->clcsk_data_ready);
 866         read_unlock_bh(&clcsk->sk_callback_lock);
 867 }
 868
 869 static void smc_fback_write_space(struct sock *clcsk)
 870 {
 871         struct smc_sock *smc;
 872
 873         read_lock_bh(&clcsk->sk_callback_lock);
 874         smc = smc_clcsock_user_data(clcsk);
 875         if (smc)
 876                 smc_fback_forward_wakeup(smc, clcsk,
 877                                          smc->clcsk_write_space);
 878         read_unlock_bh(&clcsk->sk_callback_lock);
 879 }
 880
 881 static void smc_fback_error_report(struct sock *clcsk)
 882 {
 883         struct smc_sock *smc;
 884
 885         read_lock_bh(&clcsk->sk_callback_lock);
 886         smc = smc_clcsock_user_data(clcsk);
 887         if (smc)
 888                 smc_fback_forward_wakeup(smc, clcsk,
 889                                          smc->clcsk_error_report);
 890         read_unlock_bh(&clcsk->sk_callback_lock);
 891 }
 892
 893 static void smc_fback_replace_callbacks(struct smc_sock *smc)
 894 {
 895         struct sock *clcsk = smc->clcsock->sk;
 896
 897         write_lock_bh(&clcsk->sk_callback_lock);
 898         clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
 899
 900         smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
 901                                &smc->clcsk_state_change);
 902         smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
 903                                &smc->clcsk_data_ready);
 904         smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
 905                                &smc->clcsk_write_space);
 906         smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
 907                                &smc->clcsk_error_report);
 908
 909         write_unlock_bh(&clcsk->sk_callback_lock);
 910 }
 911
 912 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
 913 {
 914         int rc = 0;
 915
 916         mutex_lock(&smc->clcsock_release_lock);
 917         if (!smc->clcsock) {
 918                 rc = -EBADF;
 919                 goto out;
 920         }
 921
 922         smc->use_fallback = true;
 923         smc->fallback_rsn = reason_code;
 924         smc_stat_fallback(smc);
 925         trace_smc_switch_to_fallback(smc, reason_code);
 926         if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
 927                 smc->clcsock->file = smc->sk.sk_socket->file;
 928                 smc->clcsock->file->private_data = smc->clcsock;
 929                 smc->clcsock->wq.fasync_list =
 930                         smc->sk.sk_socket->wq.fasync_list;
 931
 932                 /* There might be some wait entries remaining
 933                  * in smc sk->sk_wq and they should be woken up
 934                  * as clcsock's wait queue is woken up.
 935                  */
 936                 smc_fback_replace_callbacks(smc);
 937         }
 938 out:
 939         mutex_unlock(&smc->clcsock_release_lock);
 940         return rc;
 941 }
 942
 943 /* fall back during connect */
 944 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 945 {
 946         struct net *net = sock_net(&smc->sk);
 947         int rc = 0;
 948
 949         rc = smc_switch_to_fallback(smc, reason_code);
 950         if (rc) { /* fallback fails */
 951                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 952                 if (smc->sk.sk_state == SMC_INIT)
 953                         sock_put(&smc->sk); /* passive closing */
 954                 return rc;
 955         }
 956         smc_copy_sock_settings_to_clc(smc);
 957         smc->connect_nonblock = 0;
 958         if (smc->sk.sk_state == SMC_INIT)
 959                 smc->sk.sk_state = SMC_ACTIVE;
 960         return 0;
 961 }
 962
 963 /* decline and fall back during connect */
 964 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 965                                         u8 version)
 966 {
 967         struct net *net = sock_net(&smc->sk);
 968         int rc;
 969
 970         if (reason_code < 0) { /* error, fallback is not possible */
 971                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 972                 if (smc->sk.sk_state == SMC_INIT)
 973                         sock_put(&smc->sk); /* passive closing */
 974                 return reason_code;
 975         }
 976         if (reason_code != SMC_CLC_DECL_PEERDECL) {
 977                 rc = smc_clc_send_decline(smc, reason_code, version);
 978                 if (rc < 0) {
 979                         this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 980                         if (smc->sk.sk_state == SMC_INIT)
 981                                 sock_put(&smc->sk); /* passive closing */
 982                         return rc;
 983                 }
 984         }
 985         return smc_connect_fallback(smc, reason_code);
 986 }
 987
 988 static void smc_conn_abort(struct smc_sock *smc, int local_first)
 989 {
 990         struct smc_connection *conn = &smc->conn;
 991         struct smc_link_group *lgr = conn->lgr;
 992         bool lgr_valid = false;
 993
 994         if (smc_conn_lgr_valid(conn))
 995                 lgr_valid = true;
 996
 997         smc_conn_free(conn);
 998         if (local_first && lgr_valid)
 999                 smc_lgr_cleanup_early(lgr);
1000 }
1001
1002 /* check if there is a rdma device available for this connection. */
1003 /* called for connect and listen */
1004 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
1005 {
1006         /* PNET table look up: search active ib_device and port
1007          * within same PNETID that also contains the ethernet device
1008          * used for the internal TCP socket
1009          */
1010         smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
1011         if (!ini->check_smcrv2 && !ini->ib_dev)
1012                 return SMC_CLC_DECL_NOSMCRDEV;
1013         if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
1014                 return SMC_CLC_DECL_NOSMCRDEV;
1015         return 0;
1016 }
1017
1018 /* check if there is an ISM device available for this connection. */
1019 /* called for connect and listen */
1020 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
1021 {
1022         /* Find ISM device with same PNETID as connecting interface  */
1023         smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
1024         if (!ini->ism_dev[0])
1025                 return SMC_CLC_DECL_NOSMCDDEV;
1026         else
1027                 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
1028         return 0;
1029 }
1030
1031 /* is chid unique for the ism devices that are already determined? */
1032 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
1033                                            int cnt)
1034 {
1035         int i = (!ini->ism_dev[0]) ? 1 : 0;
1036
1037         for (; i < cnt; i++)
1038                 if (ini->ism_chid[i] == chid)
1039                         return false;
1040         return true;
1041 }
1042
1043 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
1044  * PNETID matching net_device)
1045  */
1046 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
1047                                        struct smc_init_info *ini)
1048 {
1049         int rc = SMC_CLC_DECL_NOSMCDDEV;
1050         struct smcd_dev *smcd;
1051         int i = 1;
1052         u16 chid;
1053
1054         if (smcd_indicated(ini->smc_type_v1))
1055                 rc = 0;         /* already initialized for V1 */
1056         mutex_lock(&smcd_dev_list.mutex);
1057         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1058                 if (smcd->going_away || smcd == ini->ism_dev[0])
1059                         continue;
1060                 chid = smc_ism_get_chid(smcd);
1061                 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
1062                         continue;
1063                 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
1064                     smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
1065                         ini->ism_dev[i] = smcd;
1066                         ini->ism_chid[i] = chid;
1067                         ini->is_smcd = true;
1068                         rc = 0;
1069                         i++;
1070                         if (i > SMC_MAX_ISM_DEVS)
1071                                 break;
1072                 }
1073         }
1074         mutex_unlock(&smcd_dev_list.mutex);
1075         ini->ism_offered_cnt = i - 1;
1076         if (!ini->ism_dev[0] && !ini->ism_dev[1])
1077                 ini->smcd_version = 0;
1078
1079         return rc;
1080 }
1081
1082 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
1083 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
1084                                       struct smc_init_info *ini)
1085 {
1086         if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
1087                 return SMC_CLC_DECL_ISMVLANERR;
1088         return 0;
1089 }
1090
1091 static int smc_find_proposal_devices(struct smc_sock *smc,
1092                                      struct smc_init_info *ini)
1093 {
1094         int rc = 0;
1095
1096         /* check if there is an ism device available */
1097         if (!(ini->smcd_version & SMC_V1) ||
1098             smc_find_ism_device(smc, ini) ||
1099             smc_connect_ism_vlan_setup(smc, ini))
1100                 ini->smcd_version &= ~SMC_V1;
1101         /* else ISM V1 is supported for this connection */
1102
1103         /* check if there is an rdma device available */
1104         if (!(ini->smcr_version & SMC_V1) ||
1105             smc_find_rdma_device(smc, ini))
1106                 ini->smcr_version &= ~SMC_V1;
1107         /* else RDMA is supported for this connection */
1108
1109         ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1110                                               ini->smcr_version & SMC_V1);
1111
1112         /* check if there is an ism v2 device available */
1113         if (!(ini->smcd_version & SMC_V2) ||
1114             !smc_ism_is_v2_capable() ||
1115             smc_find_ism_v2_device_clnt(smc, ini))
1116                 ini->smcd_version &= ~SMC_V2;
1117
1118         /* check if there is an rdma v2 device available */
1119         ini->check_smcrv2 = true;
1120         ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1121         if (!(ini->smcr_version & SMC_V2) ||
1122             smc->clcsock->sk->sk_family != AF_INET ||
1123             !smc_clc_ueid_count() ||
1124             smc_find_rdma_device(smc, ini))
1125                 ini->smcr_version &= ~SMC_V2;
1126         ini->check_smcrv2 = false;
1127
1128         ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1129                                               ini->smcr_version & SMC_V2);
1130
1131         /* if neither ISM nor RDMA are supported, fallback */
1132         if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
1133                 rc = SMC_CLC_DECL_NOSMCDEV;
1134
1135         return rc;
1136 }
1137
1138 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1139  * used, the VLAN ID will be registered again during the connection setup.
1140  */
1141 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
1142                                         struct smc_init_info *ini)
1143 {
1144         if (!smcd_indicated(ini->smc_type_v1))
1145                 return 0;
1146         if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
1147                 return SMC_CLC_DECL_CNFERR;
1148         return 0;
1149 }
1150
1151 #define SMC_CLC_MAX_ACCEPT_LEN \
1152         (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
1153          sizeof(struct smc_clc_first_contact_ext_v2x) + \
1154          sizeof(struct smc_clc_msg_trail))
1155
1156 /* CLC handshake during connect */
1157 static int smc_connect_clc(struct smc_sock *smc,
1158                            struct smc_clc_msg_accept_confirm_v2 *aclc2,
1159                            struct smc_init_info *ini)
1160 {
1161         int rc = 0;
1162
1163         /* do inband token exchange */
1164         rc = smc_clc_send_proposal(smc, ini);
1165         if (rc)
1166                 return rc;
1167         /* receive SMC Accept CLC message */
1168         return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
1169                                 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
1170 }
1171
1172 void smc_fill_gid_list(struct smc_link_group *lgr,
1173                        struct smc_gidlist *gidlist,
1174                        struct smc_ib_device *known_dev, u8 *known_gid)
1175 {
1176         struct smc_init_info *alt_ini = NULL;
1177
1178         memset(gidlist, 0, sizeof(*gidlist));
1179         memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1180
1181         alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1182         if (!alt_ini)
1183                 goto out;
1184
1185         alt_ini->vlan_id = lgr->vlan_id;
1186         alt_ini->check_smcrv2 = true;
1187         alt_ini->smcrv2.saddr = lgr->saddr;
1188         smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1189
1190         if (!alt_ini->smcrv2.ib_dev_v2)
1191                 goto out;
1192
1193         memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1194                SMC_GID_SIZE);
1195
1196 out:
1197         kfree(alt_ini);
1198 }
1199
1200 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1201                                        struct smc_clc_msg_accept_confirm *aclc,
1202                                        struct smc_init_info *ini)
1203 {
1204         struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1205                 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1206         struct smc_clc_first_contact_ext *fce =
1207                 smc_get_clc_first_contact_ext(clc_v2, false);
1208         struct net *net = sock_net(&smc->sk);
1209         int rc;
1210
1211         if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1212                 return 0;
1213
1214         if (fce->v2_direct) {
1215                 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1216                 ini->smcrv2.uses_gateway = false;
1217         } else {
1218                 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr,
1219                                       smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1220                                       ini->smcrv2.nexthop_mac,
1221                                       &ini->smcrv2.uses_gateway))
1222                         return SMC_CLC_DECL_NOROUTE;
1223                 if (!ini->smcrv2.uses_gateway) {
1224                         /* mismatch: peer claims indirect, but its direct */
1225                         return SMC_CLC_DECL_NOINDIRECT;
1226                 }
1227         }
1228
1229         ini->release_nr = fce->release;
1230         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1231         if (rc)
1232                 return rc;
1233
1234         return 0;
1235 }
1236
1237 /* setup for RDMA connection of client */
1238 static int smc_connect_rdma(struct smc_sock *smc,
1239                             struct smc_clc_msg_accept_confirm *aclc,
1240                             struct smc_init_info *ini)
1241 {
1242         int i, reason_code = 0;
1243         struct smc_link *link;
1244         u8 *eid = NULL;
1245
1246         ini->is_smcd = false;
1247         ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
1248         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1249         memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1250         memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1251         memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
1252         ini->max_conns = SMC_CONN_PER_LGR_MAX;
1253         ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1254
1255         reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1256         if (reason_code)
1257                 return reason_code;
1258
1259         mutex_lock(&smc_client_lgr_pending);
1260         reason_code = smc_conn_create(smc, ini);
1261         if (reason_code) {
1262                 mutex_unlock(&smc_client_lgr_pending);
1263                 return reason_code;
1264         }
1265
1266         smc_conn_save_peer_info(smc, aclc);
1267
1268         if (ini->first_contact_local) {
1269                 link = smc->conn.lnk;
1270         } else {
1271                 /* set link that was assigned by server */
1272                 link = NULL;
1273                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1274                         struct smc_link *l = &smc->conn.lgr->lnk[i];
1275
1276                         if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1277                             !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1278                                     SMC_GID_SIZE) &&
1279                             (aclc->hdr.version > SMC_V1 ||
1280                              !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1281                                      sizeof(l->peer_mac)))) {
1282                                 link = l;
1283                                 break;
1284                         }
1285                 }
1286                 if (!link) {
1287                         reason_code = SMC_CLC_DECL_NOSRVLINK;
1288                         goto connect_abort;
1289                 }
1290                 smc_switch_link_and_count(&smc->conn, link);
1291         }
1292
1293         /* create send buffer and rmb */
1294         if (smc_buf_create(smc, false)) {
1295                 reason_code = SMC_CLC_DECL_MEM;
1296                 goto connect_abort;
1297         }
1298
1299         if (ini->first_contact_local)
1300                 smc_link_save_peer_info(link, aclc, ini);
1301
1302         if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1303                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1304                 goto connect_abort;
1305         }
1306
1307         smc_close_init(smc);
1308         smc_rx_init(smc);
1309
1310         if (ini->first_contact_local) {
1311                 if (smc_ib_ready_link(link)) {
1312                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1313                         goto connect_abort;
1314                 }
1315         } else {
1316                 /* reg sendbufs if they were vzalloced */
1317                 if (smc->conn.sndbuf_desc->is_vm) {
1318                         if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) {
1319                                 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1320                                 goto connect_abort;
1321                         }
1322                 }
1323                 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
1324                         reason_code = SMC_CLC_DECL_ERR_REGBUF;
1325                         goto connect_abort;
1326                 }
1327         }
1328
1329         if (aclc->hdr.version > SMC_V1) {
1330                 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1331                         (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1332
1333                 eid = clc_v2->r1.eid;
1334                 if (ini->first_contact_local)
1335                         smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1336                                           link->smcibdev, link->gid);
1337         }
1338
1339         reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
1340                                            aclc->hdr.version, eid, ini);
1341         if (reason_code)
1342                 goto connect_abort;
1343
1344         smc_tx_init(smc);
1345
1346         if (ini->first_contact_local) {
1347                 /* QP confirmation over RoCE fabric */
1348                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1349                 reason_code = smcr_clnt_conf_first_link(smc);
1350                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1351                 if (reason_code)
1352                         goto connect_abort;
1353         }
1354         mutex_unlock(&smc_client_lgr_pending);
1355
1356         smc_copy_sock_settings_to_clc(smc);
1357         smc->connect_nonblock = 0;
1358         if (smc->sk.sk_state == SMC_INIT)
1359                 smc->sk.sk_state = SMC_ACTIVE;
1360
1361         return 0;
1362 connect_abort:
1363         smc_conn_abort(smc, ini->first_contact_local);
1364         mutex_unlock(&smc_client_lgr_pending);
1365         smc->connect_nonblock = 0;
1366
1367         return reason_code;
1368 }
1369
1370 /* The server has chosen one of the proposed ISM devices for the communication.
1371  * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1372  */
1373 static int
1374 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
1375                                struct smc_init_info *ini)
1376 {
1377         int i;
1378
1379         for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
1380                 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
1381                         ini->ism_selected = i;
1382                         return 0;
1383                 }
1384         }
1385
1386         return -EPROTO;
1387 }
1388
1389 /* setup for ISM connection of client */
1390 static int smc_connect_ism(struct smc_sock *smc,
1391                            struct smc_clc_msg_accept_confirm *aclc,
1392                            struct smc_init_info *ini)
1393 {
1394         u8 *eid = NULL;
1395         int rc = 0;
1396
1397         ini->is_smcd = true;
1398         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1399
1400         if (aclc->hdr.version == SMC_V2) {
1401                 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
1402                         (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1403
1404                 if (ini->first_contact_peer) {
1405                         struct smc_clc_first_contact_ext *fce =
1406                                 smc_get_clc_first_contact_ext(aclc_v2, true);
1407
1408                         ini->release_nr = fce->release;
1409                         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1410                         if (rc)
1411                                 return rc;
1412                 }
1413
1414                 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
1415                 if (rc)
1416                         return rc;
1417         }
1418         ini->ism_peer_gid[ini->ism_selected] = ntohll(aclc->d0.gid);
1419
1420         /* there is only one lgr role for SMC-D; use server lock */
1421         mutex_lock(&smc_server_lgr_pending);
1422         rc = smc_conn_create(smc, ini);
1423         if (rc) {
1424                 mutex_unlock(&smc_server_lgr_pending);
1425                 return rc;
1426         }
1427
1428         /* Create send and receive buffers */
1429         rc = smc_buf_create(smc, true);
1430         if (rc) {
1431                 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1432                 goto connect_abort;
1433         }
1434
1435         smc_conn_save_peer_info(smc, aclc);
1436         smc_close_init(smc);
1437         smc_rx_init(smc);
1438         smc_tx_init(smc);
1439
1440         if (aclc->hdr.version > SMC_V1) {
1441                 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1442                         (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1443
1444                 eid = clc_v2->d1.eid;
1445         }
1446
1447         rc = smc_clc_send_confirm(smc, ini->first_contact_local,
1448                                   aclc->hdr.version, eid, ini);
1449         if (rc)
1450                 goto connect_abort;
1451         mutex_unlock(&smc_server_lgr_pending);
1452
1453         smc_copy_sock_settings_to_clc(smc);
1454         smc->connect_nonblock = 0;
1455         if (smc->sk.sk_state == SMC_INIT)
1456                 smc->sk.sk_state = SMC_ACTIVE;
1457
1458         return 0;
1459 connect_abort:
1460         smc_conn_abort(smc, ini->first_contact_local);
1461         mutex_unlock(&smc_server_lgr_pending);
1462         smc->connect_nonblock = 0;
1463
1464         return rc;
1465 }
1466
1467 /* check if received accept type and version matches a proposed one */
1468 static int smc_connect_check_aclc(struct smc_init_info *ini,
1469                                   struct smc_clc_msg_accept_confirm *aclc)
1470 {
1471         if (aclc->hdr.typev1 != SMC_TYPE_R &&
1472             aclc->hdr.typev1 != SMC_TYPE_D)
1473                 return SMC_CLC_DECL_MODEUNSUPP;
1474
1475         if (aclc->hdr.version >= SMC_V2) {
1476                 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1477                      !smcr_indicated(ini->smc_type_v2)) ||
1478                     (aclc->hdr.typev1 == SMC_TYPE_D &&
1479                      !smcd_indicated(ini->smc_type_v2)))
1480                         return SMC_CLC_DECL_MODEUNSUPP;
1481         } else {
1482                 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1483                      !smcr_indicated(ini->smc_type_v1)) ||
1484                     (aclc->hdr.typev1 == SMC_TYPE_D &&
1485                      !smcd_indicated(ini->smc_type_v1)))
1486                         return SMC_CLC_DECL_MODEUNSUPP;
1487         }
1488
1489         return 0;
1490 }
1491
1492 /* perform steps before actually connecting */
1493 static int __smc_connect(struct smc_sock *smc)
1494 {
1495         u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1496         struct smc_clc_msg_accept_confirm_v2 *aclc2;
1497         struct smc_clc_msg_accept_confirm *aclc;
1498         struct smc_init_info *ini = NULL;
1499         u8 *buf = NULL;
1500         int rc = 0;
1501
1502         if (smc->use_fallback)
1503                 return smc_connect_fallback(smc, smc->fallback_rsn);
1504
1505         /* if peer has not signalled SMC-capability, fall back */
1506         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
1507                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
1508
1509         /* IPSec connections opt out of SMC optimizations */
1510         if (using_ipsec(smc))
1511                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1512                                                     version);
1513
1514         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1515         if (!ini)
1516                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1517                                                     version);
1518
1519         ini->smcd_version = SMC_V1 | SMC_V2;
1520         ini->smcr_version = SMC_V1 | SMC_V2;
1521         ini->smc_type_v1 = SMC_TYPE_B;
1522         ini->smc_type_v2 = SMC_TYPE_B;
1523
1524         /* get vlan id from IP device */
1525         if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
1526                 ini->smcd_version &= ~SMC_V1;
1527                 ini->smcr_version = 0;
1528                 ini->smc_type_v1 = SMC_TYPE_N;
1529                 if (!ini->smcd_version) {
1530                         rc = SMC_CLC_DECL_GETVLANERR;
1531                         goto fallback;
1532                 }
1533         }
1534
1535         rc = smc_find_proposal_devices(smc, ini);
1536         if (rc)
1537                 goto fallback;
1538
1539         buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1540         if (!buf) {
1541                 rc = SMC_CLC_DECL_MEM;
1542                 goto fallback;
1543         }
1544         aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1545         aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1546
1547         /* perform CLC handshake */
1548         rc = smc_connect_clc(smc, aclc2, ini);
1549         if (rc) {
1550                 /* -EAGAIN on timeout, see tcp_recvmsg() */
1551                 if (rc == -EAGAIN) {
1552                         rc = -ETIMEDOUT;
1553                         smc->sk.sk_err = ETIMEDOUT;
1554                 }
1555                 goto vlan_cleanup;
1556         }
1557
1558         /* check if smc modes and versions of CLC proposal and accept match */
1559         rc = smc_connect_check_aclc(ini, aclc);
1560         version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1561         if (rc)
1562                 goto vlan_cleanup;
1563
1564         /* depending on previous steps, connect using rdma or ism */
1565         if (aclc->hdr.typev1 == SMC_TYPE_R) {
1566                 ini->smcr_version = version;
1567                 rc = smc_connect_rdma(smc, aclc, ini);
1568         } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1569                 ini->smcd_version = version;
1570                 rc = smc_connect_ism(smc, aclc, ini);
1571         }
1572         if (rc)
1573                 goto vlan_cleanup;
1574
1575         SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1576         smc_connect_ism_vlan_cleanup(smc, ini);
1577         kfree(buf);
1578         kfree(ini);
1579         return 0;
1580
1581 vlan_cleanup:
1582         smc_connect_ism_vlan_cleanup(smc, ini);
1583         kfree(buf);
1584 fallback:
1585         kfree(ini);
1586         return smc_connect_decline_fallback(smc, rc, version);
1587 }
1588
1589 static void smc_connect_work(struct work_struct *work)
1590 {
1591         struct smc_sock *smc = container_of(work, struct smc_sock,
1592                                             connect_work);
1593         long timeo = smc->sk.sk_sndtimeo;
1594         int rc = 0;
1595
1596         if (!timeo)
1597                 timeo = MAX_SCHEDULE_TIMEOUT;
1598         lock_sock(smc->clcsock->sk);
1599         if (smc->clcsock->sk->sk_err) {
1600                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1601         } else if ((1 << smc->clcsock->sk->sk_state) &
1602                                         (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1603                 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1604                 if ((rc == -EPIPE) &&
1605                     ((1 << smc->clcsock->sk->sk_state) &
1606                                         (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1607                         rc = 0;
1608         }
1609         release_sock(smc->clcsock->sk);
1610         lock_sock(&smc->sk);
1611         if (rc != 0 || smc->sk.sk_err) {
1612                 smc->sk.sk_state = SMC_CLOSED;
1613                 if (rc == -EPIPE || rc == -EAGAIN)
1614                         smc->sk.sk_err = EPIPE;
1615                 else if (rc == -ECONNREFUSED)
1616                         smc->sk.sk_err = ECONNREFUSED;
1617                 else if (signal_pending(current))
1618                         smc->sk.sk_err = -sock_intr_errno(timeo);
1619                 sock_put(&smc->sk); /* passive closing */
1620                 goto out;
1621         }
1622
1623         rc = __smc_connect(smc);
1624         if (rc < 0)
1625                 smc->sk.sk_err = -rc;
1626
1627 out:
1628         if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1629                 if (smc->sk.sk_err) {
1630                         smc->sk.sk_state_change(&smc->sk);
1631                 } else { /* allow polling before and after fallback decision */
1632                         smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1633                         smc->sk.sk_write_space(&smc->sk);
1634                 }
1635         }
1636         release_sock(&smc->sk);
1637 }
1638
1639 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1640                        int alen, int flags)
1641 {
1642         struct sock *sk = sock->sk;
1643         struct smc_sock *smc;
1644         int rc = -EINVAL;
1645
1646         smc = smc_sk(sk);
1647
1648         /* separate smc parameter checking to be safe */
1649         if (alen < sizeof(addr->sa_family))
1650                 goto out_err;
1651         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1652                 goto out_err;
1653
1654         lock_sock(sk);
1655         switch (sock->state) {
1656         default:
1657                 rc = -EINVAL;
1658                 goto out;
1659         case SS_CONNECTED:
1660                 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1661                 goto out;
1662         case SS_CONNECTING:
1663                 if (sk->sk_state == SMC_ACTIVE)
1664                         goto connected;
1665                 break;
1666         case SS_UNCONNECTED:
1667                 sock->state = SS_CONNECTING;
1668                 break;
1669         }
1670
1671         switch (sk->sk_state) {
1672         default:
1673                 goto out;
1674         case SMC_CLOSED:
1675                 rc = sock_error(sk) ? : -ECONNABORTED;
1676                 sock->state = SS_UNCONNECTED;
1677                 goto out;
1678         case SMC_ACTIVE:
1679                 rc = -EISCONN;
1680                 goto out;
1681         case SMC_INIT:
1682                 break;
1683         }
1684
1685         smc_copy_sock_settings_to_clc(smc);
1686         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1687         if (smc->connect_nonblock) {
1688                 rc = -EALREADY;
1689                 goto out;
1690         }
1691         rc = kernel_connect(smc->clcsock, addr, alen, flags);
1692         if (rc && rc != -EINPROGRESS)
1693                 goto out;
1694
1695         if (smc->use_fallback) {
1696                 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
1697                 goto out;
1698         }
1699         sock_hold(&smc->sk); /* sock put in passive closing */
1700         if (flags & O_NONBLOCK) {
1701                 if (queue_work(smc_hs_wq, &smc->connect_work))
1702                         smc->connect_nonblock = 1;
1703                 rc = -EINPROGRESS;
1704                 goto out;
1705         } else {
1706                 rc = __smc_connect(smc);
1707                 if (rc < 0)
1708                         goto out;
1709         }
1710
1711 connected:
1712         rc = 0;
1713         sock->state = SS_CONNECTED;
1714 out:
1715         release_sock(sk);
1716 out_err:
1717         return rc;
1718 }
1719
1720 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1721 {
1722         struct socket *new_clcsock = NULL;
1723         struct sock *lsk = &lsmc->sk;
1724         struct sock *new_sk;
1725         int rc = -EINVAL;
1726
1727         release_sock(lsk);
1728         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1729         if (!new_sk) {
1730                 rc = -ENOMEM;
1731                 lsk->sk_err = ENOMEM;
1732                 *new_smc = NULL;
1733                 lock_sock(lsk);
1734                 goto out;
1735         }
1736         *new_smc = smc_sk(new_sk);
1737
1738         mutex_lock(&lsmc->clcsock_release_lock);
1739         if (lsmc->clcsock)
1740                 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1741         mutex_unlock(&lsmc->clcsock_release_lock);
1742         lock_sock(lsk);
1743         if  (rc < 0 && rc != -EAGAIN)
1744                 lsk->sk_err = -rc;
1745         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1746                 new_sk->sk_prot->unhash(new_sk);
1747                 if (new_clcsock)
1748                         sock_release(new_clcsock);
1749                 new_sk->sk_state = SMC_CLOSED;
1750                 smc_sock_set_flag(new_sk, SOCK_DEAD);
1751                 sock_put(new_sk); /* final */
1752                 *new_smc = NULL;
1753                 goto out;
1754         }
1755
1756         /* new clcsock has inherited the smc listen-specific sk_data_ready
1757          * function; switch it back to the original sk_data_ready function
1758          */
1759         new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1760
1761         /* if new clcsock has also inherited the fallback-specific callback
1762          * functions, switch them back to the original ones.
1763          */
1764         if (lsmc->use_fallback) {
1765                 if (lsmc->clcsk_state_change)
1766                         new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1767                 if (lsmc->clcsk_write_space)
1768                         new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1769                 if (lsmc->clcsk_error_report)
1770                         new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1771         }
1772
1773         (*new_smc)->clcsock = new_clcsock;
1774 out:
1775         return rc;
1776 }
1777
1778 /* add a just created sock to the accept queue of the listen sock as
1779  * candidate for a following socket accept call from user space
1780  */
1781 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1782 {
1783         struct smc_sock *par = smc_sk(parent);
1784
1785         sock_hold(sk); /* sock_put in smc_accept_unlink () */
1786         spin_lock(&par->accept_q_lock);
1787         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1788         spin_unlock(&par->accept_q_lock);
1789         sk_acceptq_added(parent);
1790 }
1791
1792 /* remove a socket from the accept queue of its parental listening socket */
1793 static void smc_accept_unlink(struct sock *sk)
1794 {
1795         struct smc_sock *par = smc_sk(sk)->listen_smc;
1796
1797         spin_lock(&par->accept_q_lock);
1798         list_del_init(&smc_sk(sk)->accept_q);
1799         spin_unlock(&par->accept_q_lock);
1800         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1801         sock_put(sk); /* sock_hold in smc_accept_enqueue */
1802 }
1803
1804 /* remove a sock from the accept queue to bind it to a new socket created
1805  * for a socket accept call from user space
1806  */
1807 struct sock *smc_accept_dequeue(struct sock *parent,
1808                                 struct socket *new_sock)
1809 {
1810         struct smc_sock *isk, *n;
1811         struct sock *new_sk;
1812
1813         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1814                 new_sk = (struct sock *)isk;
1815
1816                 smc_accept_unlink(new_sk);
1817                 if (new_sk->sk_state == SMC_CLOSED) {
1818                         new_sk->sk_prot->unhash(new_sk);
1819                         if (isk->clcsock) {
1820                                 sock_release(isk->clcsock);
1821                                 isk->clcsock = NULL;
1822                         }
1823                         sock_put(new_sk); /* final */
1824                         continue;
1825                 }
1826                 if (new_sock) {
1827                         sock_graft(new_sk, new_sock);
1828                         new_sock->state = SS_CONNECTED;
1829                         if (isk->use_fallback) {
1830                                 smc_sk(new_sk)->clcsock->file = new_sock->file;
1831                                 isk->clcsock->file->private_data = isk->clcsock;
1832                         }
1833                 }
1834                 return new_sk;
1835         }
1836         return NULL;
1837 }
1838
1839 /* clean up for a created but never accepted sock */
1840 void smc_close_non_accepted(struct sock *sk)
1841 {
1842         struct smc_sock *smc = smc_sk(sk);
1843
1844         sock_hold(sk); /* sock_put below */
1845         lock_sock(sk);
1846         if (!sk->sk_lingertime)
1847                 /* wait for peer closing */
1848                 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);
1849         __smc_release(smc);
1850         release_sock(sk);
1851         sock_put(sk); /* sock_hold above */
1852         sock_put(sk); /* final sock_put */
1853 }
1854
1855 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1856 {
1857         struct smc_link *link = smc->conn.lnk;
1858         struct smc_llc_qentry *qentry;
1859         int rc;
1860
1861         /* reg the sndbuf if it was vzalloced*/
1862         if (smc->conn.sndbuf_desc->is_vm) {
1863                 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
1864                         return SMC_CLC_DECL_ERR_REGBUF;
1865         }
1866
1867         /* reg the rmb */
1868         if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
1869                 return SMC_CLC_DECL_ERR_REGBUF;
1870
1871         /* send CONFIRM LINK request to client over the RoCE fabric */
1872         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1873         if (rc < 0)
1874                 return SMC_CLC_DECL_TIMEOUT_CL;
1875
1876         /* receive CONFIRM LINK response from client over the RoCE fabric */
1877         qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1878                               SMC_LLC_CONFIRM_LINK);
1879         if (!qentry) {
1880                 struct smc_clc_msg_decline dclc;
1881
1882                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1883                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1884                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1885         }
1886         smc_llc_save_peer_uid(qentry);
1887         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1888         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1889         if (rc)
1890                 return SMC_CLC_DECL_RMBE_EC;
1891
1892         /* confirm_rkey is implicit on 1st contact */
1893         smc->conn.rmb_desc->is_conf_rkey = true;
1894
1895         smc_llc_link_active(link);
1896         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1897
1898         if (link->lgr->max_links > 1) {
1899                 down_write(&link->lgr->llc_conf_mutex);
1900                 /* initial contact - try to establish second link */
1901                 smc_llc_srv_add_link(link, NULL);
1902                 up_write(&link->lgr->llc_conf_mutex);
1903         }
1904         return 0;
1905 }
1906
1907 /* listen worker: finish */
1908 static void smc_listen_out(struct smc_sock *new_smc)
1909 {
1910         struct smc_sock *lsmc = new_smc->listen_smc;
1911         struct sock *newsmcsk = &new_smc->sk;
1912
1913         if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1914                 atomic_dec(&lsmc->queued_smc_hs);
1915
1916         if (lsmc->sk.sk_state == SMC_LISTEN) {
1917                 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1918                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1919                 release_sock(&lsmc->sk);
1920         } else { /* no longer listening */
1921                 smc_close_non_accepted(newsmcsk);
1922         }
1923
1924         /* Wake up accept */
1925         lsmc->sk.sk_data_ready(&lsmc->sk);
1926         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1927 }
1928
1929 /* listen worker: finish in state connected */
1930 static void smc_listen_out_connected(struct smc_sock *new_smc)
1931 {
1932         struct sock *newsmcsk = &new_smc->sk;
1933
1934         if (newsmcsk->sk_state == SMC_INIT)
1935                 newsmcsk->sk_state = SMC_ACTIVE;
1936
1937         smc_listen_out(new_smc);
1938 }
1939
1940 /* listen worker: finish in error state */
1941 static void smc_listen_out_err(struct smc_sock *new_smc)
1942 {
1943         struct sock *newsmcsk = &new_smc->sk;
1944         struct net *net = sock_net(newsmcsk);
1945
1946         this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1947         if (newsmcsk->sk_state == SMC_INIT)
1948                 sock_put(&new_smc->sk); /* passive closing */
1949         newsmcsk->sk_state = SMC_CLOSED;
1950
1951         smc_listen_out(new_smc);
1952 }
1953
1954 /* listen worker: decline and fall back if possible */
1955 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1956                                int local_first, u8 version)
1957 {
1958         /* RDMA setup failed, switch back to TCP */
1959         smc_conn_abort(new_smc, local_first);
1960         if (reason_code < 0 ||
1961             smc_switch_to_fallback(new_smc, reason_code)) {
1962                 /* error, no fallback possible */
1963                 smc_listen_out_err(new_smc);
1964                 return;
1965         }
1966         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1967                 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1968                         smc_listen_out_err(new_smc);
1969                         return;
1970                 }
1971         }
1972         smc_listen_out_connected(new_smc);
1973 }
1974
1975 /* listen worker: version checking */
1976 static int smc_listen_v2_check(struct smc_sock *new_smc,
1977                                struct smc_clc_msg_proposal *pclc,
1978                                struct smc_init_info *ini)
1979 {
1980         struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1981         struct smc_clc_v2_extension *pclc_v2_ext;
1982         int rc = SMC_CLC_DECL_PEERNOSMC;
1983
1984         ini->smc_type_v1 = pclc->hdr.typev1;
1985         ini->smc_type_v2 = pclc->hdr.typev2;
1986         ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1987         ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1988         if (pclc->hdr.version > SMC_V1) {
1989                 if (smcd_indicated(ini->smc_type_v2))
1990                         ini->smcd_version |= SMC_V2;
1991                 if (smcr_indicated(ini->smc_type_v2))
1992                         ini->smcr_version |= SMC_V2;
1993         }
1994         if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1995                 rc = SMC_CLC_DECL_PEERNOSMC;
1996                 goto out;
1997         }
1998         pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1999         if (!pclc_v2_ext) {
2000                 ini->smcd_version &= ~SMC_V2;
2001                 ini->smcr_version &= ~SMC_V2;
2002                 rc = SMC_CLC_DECL_NOV2EXT;
2003                 goto out;
2004         }
2005         pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
2006         if (ini->smcd_version & SMC_V2) {
2007                 if (!smc_ism_is_v2_capable()) {
2008                         ini->smcd_version &= ~SMC_V2;
2009                         rc = SMC_CLC_DECL_NOISM2SUPP;
2010                 } else if (!pclc_smcd_v2_ext) {
2011                         ini->smcd_version &= ~SMC_V2;
2012                         rc = SMC_CLC_DECL_NOV2DEXT;
2013                 } else if (!pclc_v2_ext->hdr.eid_cnt &&
2014                            !pclc_v2_ext->hdr.flag.seid) {
2015                         ini->smcd_version &= ~SMC_V2;
2016                         rc = SMC_CLC_DECL_NOUEID;
2017                 }
2018         }
2019         if (ini->smcr_version & SMC_V2) {
2020                 if (!pclc_v2_ext->hdr.eid_cnt) {
2021                         ini->smcr_version &= ~SMC_V2;
2022                         rc = SMC_CLC_DECL_NOUEID;
2023                 }
2024         }
2025
2026         ini->release_nr = pclc_v2_ext->hdr.flag.release;
2027         if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
2028                 ini->release_nr = SMC_RELEASE;
2029
2030 out:
2031         if (!ini->smcd_version && !ini->smcr_version)
2032                 return rc;
2033
2034         return 0;
2035 }
2036
2037 /* listen worker: check prefixes */
2038 static int smc_listen_prfx_check(struct smc_sock *new_smc,
2039                                  struct smc_clc_msg_proposal *pclc)
2040 {
2041         struct smc_clc_msg_proposal_prefix *pclc_prfx;
2042         struct socket *newclcsock = new_smc->clcsock;
2043
2044         if (pclc->hdr.typev1 == SMC_TYPE_N)
2045                 return 0;
2046         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
2047         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
2048                 return SMC_CLC_DECL_DIFFPREFIX;
2049
2050         return 0;
2051 }
2052
2053 /* listen worker: initialize connection and buffers */
2054 static int smc_listen_rdma_init(struct smc_sock *new_smc,
2055                                 struct smc_init_info *ini)
2056 {
2057         int rc;
2058
2059         /* allocate connection / link group */
2060         rc = smc_conn_create(new_smc, ini);
2061         if (rc)
2062                 return rc;
2063
2064         /* create send buffer and rmb */
2065         if (smc_buf_create(new_smc, false)) {
2066                 smc_conn_abort(new_smc, ini->first_contact_local);
2067                 return SMC_CLC_DECL_MEM;
2068         }
2069
2070         return 0;
2071 }
2072
2073 /* listen worker: initialize connection and buffers for SMC-D */
2074 static int smc_listen_ism_init(struct smc_sock *new_smc,
2075                                struct smc_init_info *ini)
2076 {
2077         int rc;
2078
2079         rc = smc_conn_create(new_smc, ini);
2080         if (rc)
2081                 return rc;
2082
2083         /* Create send and receive buffers */
2084         rc = smc_buf_create(new_smc, true);
2085         if (rc) {
2086                 smc_conn_abort(new_smc, ini->first_contact_local);
2087                 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
2088                                          SMC_CLC_DECL_MEM;
2089         }
2090
2091         return 0;
2092 }
2093
2094 static bool smc_is_already_selected(struct smcd_dev *smcd,
2095                                     struct smc_init_info *ini,
2096                                     int matches)
2097 {
2098         int i;
2099
2100         for (i = 0; i < matches; i++)
2101                 if (smcd == ini->ism_dev[i])
2102                         return true;
2103
2104         return false;
2105 }
2106
2107 /* check for ISM devices matching proposed ISM devices */
2108 static void smc_check_ism_v2_match(struct smc_init_info *ini,
2109                                    u16 proposed_chid, u64 proposed_gid,
2110                                    unsigned int *matches)
2111 {
2112         struct smcd_dev *smcd;
2113
2114         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2115                 if (smcd->going_away)
2116                         continue;
2117                 if (smc_is_already_selected(smcd, ini, *matches))
2118                         continue;
2119                 if (smc_ism_get_chid(smcd) == proposed_chid &&
2120                     !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
2121                         ini->ism_peer_gid[*matches] = proposed_gid;
2122                         ini->ism_dev[*matches] = smcd;
2123                         (*matches)++;
2124                         break;
2125                 }
2126         }
2127 }
2128
2129 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2130 {
2131         if (!ini->rc)
2132                 ini->rc = rc;
2133 }
2134
2135 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2136                                         struct smc_clc_msg_proposal *pclc,
2137                                         struct smc_init_info *ini)
2138 {
2139         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2140         struct smc_clc_v2_extension *smc_v2_ext;
2141         struct smc_clc_msg_smcd *pclc_smcd;
2142         unsigned int matches = 0;
2143         u8 smcd_version;
2144         u8 *eid = NULL;
2145         int i, rc;
2146
2147         if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
2148                 goto not_found;
2149
2150         pclc_smcd = smc_get_clc_msg_smcd(pclc);
2151         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2152         smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
2153
2154         mutex_lock(&smcd_dev_list.mutex);
2155         if (pclc_smcd->ism.chid)
2156                 /* check for ISM device matching proposed native ISM device */
2157                 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2158                                        ntohll(pclc_smcd->ism.gid), &matches);
2159         for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
2160                 /* check for ISM devices matching proposed non-native ISM
2161                  * devices
2162                  */
2163                 smc_check_ism_v2_match(ini,
2164                                        ntohs(smcd_v2_ext->gidchid[i - 1].chid),
2165                                        ntohll(smcd_v2_ext->gidchid[i - 1].gid),
2166                                        &matches);
2167         }
2168         mutex_unlock(&smcd_dev_list.mutex);
2169
2170         if (!ini->ism_dev[0]) {
2171                 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
2172                 goto not_found;
2173         }
2174
2175         smc_ism_get_system_eid(&eid);
2176         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2177                                smcd_v2_ext->system_eid, eid))
2178                 goto not_found;
2179
2180         /* separate - outside the smcd_dev_list.lock */
2181         smcd_version = ini->smcd_version;
2182         for (i = 0; i < matches; i++) {
2183                 ini->smcd_version = SMC_V2;
2184                 ini->is_smcd = true;
2185                 ini->ism_selected = i;
2186                 rc = smc_listen_ism_init(new_smc, ini);
2187                 if (rc) {
2188                         smc_find_ism_store_rc(rc, ini);
2189                         /* try next active ISM device */
2190                         continue;
2191                 }
2192                 return; /* matching and usable V2 ISM device found */
2193         }
2194         /* no V2 ISM device could be initialized */
2195         ini->smcd_version = smcd_version;       /* restore original value */
2196         ini->negotiated_eid[0] = 0;
2197
2198 not_found:
2199         ini->smcd_version &= ~SMC_V2;
2200         ini->ism_dev[0] = NULL;
2201         ini->is_smcd = false;
2202 }
2203
2204 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2205                                         struct smc_clc_msg_proposal *pclc,
2206                                         struct smc_init_info *ini)
2207 {
2208         struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
2209         int rc = 0;
2210
2211         /* check if ISM V1 is available */
2212         if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
2213                 goto not_found;
2214         ini->is_smcd = true; /* prepare ISM check */
2215         ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
2216         rc = smc_find_ism_device(new_smc, ini);
2217         if (rc)
2218                 goto not_found;
2219         ini->ism_selected = 0;
2220         rc = smc_listen_ism_init(new_smc, ini);
2221         if (!rc)
2222                 return;         /* V1 ISM device found */
2223
2224 not_found:
2225         smc_find_ism_store_rc(rc, ini);
2226         ini->smcd_version &= ~SMC_V1;
2227         ini->ism_dev[0] = NULL;
2228         ini->is_smcd = false;
2229 }
2230
2231 /* listen worker: register buffers */
2232 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
2233 {
2234         struct smc_connection *conn = &new_smc->conn;
2235
2236         if (!local_first) {
2237                 /* reg sendbufs if they were vzalloced */
2238                 if (conn->sndbuf_desc->is_vm) {
2239                         if (smcr_lgr_reg_sndbufs(conn->lnk,
2240                                                  conn->sndbuf_desc))
2241                                 return SMC_CLC_DECL_ERR_REGBUF;
2242                 }
2243                 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
2244                         return SMC_CLC_DECL_ERR_REGBUF;
2245         }
2246
2247         return 0;
2248 }
2249
2250 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2251                                          struct smc_clc_msg_proposal *pclc,
2252                                          struct smc_init_info *ini)
2253 {
2254         struct smc_clc_v2_extension *smc_v2_ext;
2255         u8 smcr_version;
2256         int rc;
2257
2258         if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2259                 goto not_found;
2260
2261         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2262         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2263                 goto not_found;
2264
2265         /* prepare RDMA check */
2266         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2267         memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2268         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2269         ini->check_smcrv2 = true;
2270         ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2271         ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2272         ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2273         rc = smc_find_rdma_device(new_smc, ini);
2274         if (rc) {
2275                 smc_find_ism_store_rc(rc, ini);
2276                 goto not_found;
2277         }
2278         if (!ini->smcrv2.uses_gateway)
2279                 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2280
2281         smcr_version = ini->smcr_version;
2282         ini->smcr_version = SMC_V2;
2283         rc = smc_listen_rdma_init(new_smc, ini);
2284         if (!rc) {
2285                 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2286                 if (rc)
2287                         smc_conn_abort(new_smc, ini->first_contact_local);
2288         }
2289         if (!rc)
2290                 return;
2291         ini->smcr_version = smcr_version;
2292         smc_find_ism_store_rc(rc, ini);
2293
2294 not_found:
2295         ini->smcr_version &= ~SMC_V2;
2296         ini->smcrv2.ib_dev_v2 = NULL;
2297         ini->check_smcrv2 = false;
2298 }
2299
2300 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2301                                         struct smc_clc_msg_proposal *pclc,
2302                                         struct smc_init_info *ini)
2303 {
2304         int rc;
2305
2306         if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
2307                 return SMC_CLC_DECL_NOSMCDEV;
2308
2309         /* prepare RDMA check */
2310         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2311         memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2312         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2313         rc = smc_find_rdma_device(new_smc, ini);
2314         if (rc) {
2315                 /* no RDMA device found */
2316                 return SMC_CLC_DECL_NOSMCDEV;
2317         }
2318         rc = smc_listen_rdma_init(new_smc, ini);
2319         if (rc)
2320                 return rc;
2321         return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2322 }
2323
2324 /* determine the local device matching to proposal */
2325 static int smc_listen_find_device(struct smc_sock *new_smc,
2326                                   struct smc_clc_msg_proposal *pclc,
2327                                   struct smc_init_info *ini)
2328 {
2329         int prfx_rc;
2330
2331         /* check for ISM device matching V2 proposed device */
2332         smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2333         if (ini->ism_dev[0])
2334                 return 0;
2335
2336         /* check for matching IP prefix and subnet length (V1) */
2337         prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2338         if (prfx_rc)
2339                 smc_find_ism_store_rc(prfx_rc, ini);
2340
2341         /* get vlan id from IP device */
2342         if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
2343                 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
2344
2345         /* check for ISM device matching V1 proposed device */
2346         if (!prfx_rc)
2347                 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
2348         if (ini->ism_dev[0])
2349                 return 0;
2350
2351         if (!smcr_indicated(pclc->hdr.typev1) &&
2352             !smcr_indicated(pclc->hdr.typev2))
2353                 /* skip RDMA and decline */
2354                 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
2355
2356         /* check if RDMA V2 is available */
2357         smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2358         if (ini->smcrv2.ib_dev_v2)
2359                 return 0;
2360
2361         /* check if RDMA V1 is available */
2362         if (!prfx_rc) {
2363                 int rc;
2364
2365                 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2366                 smc_find_ism_store_rc(rc, ini);
2367                 return (!rc) ? 0 : ini->rc;
2368         }
2369         return prfx_rc;
2370 }
2371
2372 /* listen worker: finish RDMA setup */
2373 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2374                                   struct smc_clc_msg_accept_confirm *cclc,
2375                                   bool local_first,
2376                                   struct smc_init_info *ini)
2377 {
2378         struct smc_link *link = new_smc->conn.lnk;
2379         int reason_code = 0;
2380
2381         if (local_first)
2382                 smc_link_save_peer_info(link, cclc, ini);
2383
2384         if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2385                 return SMC_CLC_DECL_ERR_RTOK;
2386
2387         if (local_first) {
2388                 if (smc_ib_ready_link(link))
2389                         return SMC_CLC_DECL_ERR_RDYLNK;
2390                 /* QP confirmation over RoCE fabric */
2391                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
2392                 reason_code = smcr_serv_conf_first_link(new_smc);
2393                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
2394         }
2395         return reason_code;
2396 }
2397
2398 /* setup for connection of server */
2399 static void smc_listen_work(struct work_struct *work)
2400 {
2401         struct smc_sock *new_smc = container_of(work, struct smc_sock,
2402                                                 smc_listen_work);
2403         struct socket *newclcsock = new_smc->clcsock;
2404         struct smc_clc_msg_accept_confirm *cclc;
2405         struct smc_clc_msg_proposal_area *buf;
2406         struct smc_clc_msg_proposal *pclc;
2407         struct smc_init_info *ini = NULL;
2408         u8 proposal_version = SMC_V1;
2409         u8 accept_version;
2410         int rc = 0;
2411
2412         if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2413                 return smc_listen_out_err(new_smc);
2414
2415         if (new_smc->use_fallback) {
2416                 smc_listen_out_connected(new_smc);
2417                 return;
2418         }
2419
2420         /* check if peer is smc capable */
2421         if (!tcp_sk(newclcsock->sk)->syn_smc) {
2422                 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2423                 if (rc)
2424                         smc_listen_out_err(new_smc);
2425                 else
2426                         smc_listen_out_connected(new_smc);
2427                 return;
2428         }
2429
2430         /* do inband token exchange -
2431          * wait for and receive SMC Proposal CLC message
2432          */
2433         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2434         if (!buf) {
2435                 rc = SMC_CLC_DECL_MEM;
2436                 goto out_decl;
2437         }
2438         pclc = (struct smc_clc_msg_proposal *)buf;
2439         rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
2440                               SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
2441         if (rc)
2442                 goto out_decl;
2443
2444         if (pclc->hdr.version > SMC_V1)
2445                 proposal_version = SMC_V2;
2446
2447         /* IPSec connections opt out of SMC optimizations */
2448         if (using_ipsec(new_smc)) {
2449                 rc = SMC_CLC_DECL_IPSEC;
2450                 goto out_decl;
2451         }
2452
2453         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2454         if (!ini) {
2455                 rc = SMC_CLC_DECL_MEM;
2456                 goto out_decl;
2457         }
2458
2459         /* initial version checking */
2460         rc = smc_listen_v2_check(new_smc, pclc, ini);
2461         if (rc)
2462                 goto out_decl;
2463
2464         rc = smc_clc_srv_v2x_features_validate(pclc, ini);
2465         if (rc)
2466                 goto out_decl;
2467
2468         mutex_lock(&smc_server_lgr_pending);
2469         smc_close_init(new_smc);
2470         smc_rx_init(new_smc);
2471         smc_tx_init(new_smc);
2472
2473         /* determine ISM or RoCE device used for connection */
2474         rc = smc_listen_find_device(new_smc, pclc, ini);
2475         if (rc)
2476                 goto out_unlock;
2477
2478         /* send SMC Accept CLC message */
2479         accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
2480         rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
2481                                  accept_version, ini->negotiated_eid, ini);
2482         if (rc)
2483                 goto out_unlock;
2484
2485         /* SMC-D does not need this lock any more */
2486         if (ini->is_smcd)
2487                 mutex_unlock(&smc_server_lgr_pending);
2488
2489         /* receive SMC Confirm CLC message */
2490         memset(buf, 0, sizeof(*buf));
2491         cclc = (struct smc_clc_msg_accept_confirm *)buf;
2492         rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
2493                               SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2494         if (rc) {
2495                 if (!ini->is_smcd)
2496                         goto out_unlock;
2497                 goto out_decl;
2498         }
2499
2500         rc = smc_clc_v2x_features_confirm_check(cclc, ini);
2501         if (rc) {
2502                 if (!ini->is_smcd)
2503                         goto out_unlock;
2504                 goto out_decl;
2505         }
2506
2507         /* fce smc release version is needed in smc_listen_rdma_finish,
2508          * so save fce info here.
2509          */
2510         smc_conn_save_peer_info_fce(new_smc, cclc);
2511
2512         /* finish worker */
2513         if (!ini->is_smcd) {
2514                 rc = smc_listen_rdma_finish(new_smc, cclc,
2515                                             ini->first_contact_local, ini);
2516                 if (rc)
2517                         goto out_unlock;
2518                 mutex_unlock(&smc_server_lgr_pending);
2519         }
2520         smc_conn_save_peer_info(new_smc, cclc);
2521         smc_listen_out_connected(new_smc);
2522         SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
2523         goto out_free;
2524
2525 out_unlock:
2526         mutex_unlock(&smc_server_lgr_pending);
2527 out_decl:
2528         smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
2529                            proposal_version);
2530 out_free:
2531         kfree(ini);
2532         kfree(buf);
2533 }
2534
2535 static void smc_tcp_listen_work(struct work_struct *work)
2536 {
2537         struct smc_sock *lsmc = container_of(work, struct smc_sock,
2538                                              tcp_listen_work);
2539         struct sock *lsk = &lsmc->sk;
2540         struct smc_sock *new_smc;
2541         int rc = 0;
2542
2543         lock_sock(lsk);
2544         while (lsk->sk_state == SMC_LISTEN) {
2545                 rc = smc_clcsock_accept(lsmc, &new_smc);
2546                 if (rc) /* clcsock accept queue empty or error */
2547                         goto out;
2548                 if (!new_smc)
2549                         continue;
2550
2551                 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2552                         atomic_inc(&lsmc->queued_smc_hs);
2553
2554                 new_smc->listen_smc = lsmc;
2555                 new_smc->use_fallback = lsmc->use_fallback;
2556                 new_smc->fallback_rsn = lsmc->fallback_rsn;
2557                 sock_hold(lsk); /* sock_put in smc_listen_work */
2558                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2559                 smc_copy_sock_settings_to_smc(new_smc);
2560                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
2561                 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
2562                         sock_put(&new_smc->sk);
2563         }
2564
2565 out:
2566         release_sock(lsk);
2567         sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2568 }
2569
2570 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2571 {
2572         struct smc_sock *lsmc;
2573
2574         read_lock_bh(&listen_clcsock->sk_callback_lock);
2575         lsmc = smc_clcsock_user_data(listen_clcsock);
2576         if (!lsmc)
2577                 goto out;
2578         lsmc->clcsk_data_ready(listen_clcsock);
2579         if (lsmc->sk.sk_state == SMC_LISTEN) {
2580                 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
2581                 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
2582                         sock_put(&lsmc->sk);
2583         }
2584 out:
2585         read_unlock_bh(&listen_clcsock->sk_callback_lock);
2586 }
2587
2588 static int smc_listen(struct socket *sock, int backlog)
2589 {
2590         struct sock *sk = sock->sk;
2591         struct smc_sock *smc;
2592         int rc;
2593
2594         smc = smc_sk(sk);
2595         lock_sock(sk);
2596
2597         rc = -EINVAL;
2598         if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2599             smc->connect_nonblock || sock->state != SS_UNCONNECTED)
2600                 goto out;
2601
2602         rc = 0;
2603         if (sk->sk_state == SMC_LISTEN) {
2604                 sk->sk_max_ack_backlog = backlog;
2605                 goto out;
2606         }
2607         /* some socket options are handled in core, so we could not apply
2608          * them to the clc socket -- copy smc socket options to clc socket
2609          */
2610         smc_copy_sock_settings_to_clc(smc);
2611         if (!smc->use_fallback)
2612                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
2613
2614         /* save original sk_data_ready function and establish
2615          * smc-specific sk_data_ready function
2616          */
2617         write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2618         smc->clcsock->sk->sk_user_data =
2619                 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
2620         smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2621                                smc_clcsock_data_ready, &smc->clcsk_data_ready);
2622         write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2623
2624         /* save original ops */
2625         smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2626
2627         smc->af_ops = *smc->ori_af_ops;
2628         smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2629
2630         inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2631
2632         if (smc->limit_smc_hs)
2633                 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
2634
2635         rc = kernel_listen(smc->clcsock, backlog);
2636         if (rc) {
2637                 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2638                 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2639                                        &smc->clcsk_data_ready);
2640                 smc->clcsock->sk->sk_user_data = NULL;
2641                 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2642                 goto out;
2643         }
2644         sk->sk_max_ack_backlog = backlog;
2645         sk->sk_ack_backlog = 0;
2646         sk->sk_state = SMC_LISTEN;
2647
2648 out:
2649         release_sock(sk);
2650         return rc;
2651 }
2652
2653 static int smc_accept(struct socket *sock, struct socket *new_sock,
2654                       int flags, bool kern)
2655 {
2656         struct sock *sk = sock->sk, *nsk;
2657         DECLARE_WAITQUEUE(wait, current);
2658         struct smc_sock *lsmc;
2659         long timeo;
2660         int rc = 0;
2661
2662         lsmc = smc_sk(sk);
2663         sock_hold(sk); /* sock_put below */
2664         lock_sock(sk);
2665
2666         if (lsmc->sk.sk_state != SMC_LISTEN) {
2667                 rc = -EINVAL;
2668                 release_sock(sk);
2669                 goto out;
2670         }
2671
2672         /* Wait for an incoming connection */
2673         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2674         add_wait_queue_exclusive(sk_sleep(sk), &wait);
2675         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2676                 set_current_state(TASK_INTERRUPTIBLE);
2677                 if (!timeo) {
2678                         rc = -EAGAIN;
2679                         break;
2680                 }
2681                 release_sock(sk);
2682                 timeo = schedule_timeout(timeo);
2683                 /* wakeup by sk_data_ready in smc_listen_work() */
2684                 sched_annotate_sleep();
2685                 lock_sock(sk);
2686                 if (signal_pending(current)) {
2687                         rc = sock_intr_errno(timeo);
2688                         break;
2689                 }
2690         }
2691         set_current_state(TASK_RUNNING);
2692         remove_wait_queue(sk_sleep(sk), &wait);
2693
2694         if (!rc)
2695                 rc = sock_error(nsk);
2696         release_sock(sk);
2697         if (rc)
2698                 goto out;
2699
2700         if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2701                 /* wait till data arrives on the socket */
2702                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2703                                                                 MSEC_PER_SEC);
2704                 if (smc_sk(nsk)->use_fallback) {
2705                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2706
2707                         lock_sock(clcsk);
2708                         if (skb_queue_empty(&clcsk->sk_receive_queue))
2709                                 sk_wait_data(clcsk, &timeo, NULL);
2710                         release_sock(clcsk);
2711                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2712                         lock_sock(nsk);
2713                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
2714                         release_sock(nsk);
2715                 }
2716         }
2717
2718 out:
2719         sock_put(sk); /* sock_hold above */
2720         return rc;
2721 }
2722
2723 static int smc_getname(struct socket *sock, struct sockaddr *addr,
2724                        int peer)
2725 {
2726         struct smc_sock *smc;
2727
2728         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2729             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2730                 return -ENOTCONN;
2731
2732         smc = smc_sk(sock->sk);
2733
2734         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2735 }
2736
2737 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2738 {
2739         struct sock *sk = sock->sk;
2740         struct smc_sock *smc;
2741         int rc;
2742
2743         smc = smc_sk(sk);
2744         lock_sock(sk);
2745
2746         /* SMC does not support connect with fastopen */
2747         if (msg->msg_flags & MSG_FASTOPEN) {
2748                 /* not connected yet, fallback */
2749                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2750                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2751                         if (rc)
2752                                 goto out;
2753                 } else {
2754                         rc = -EINVAL;
2755                         goto out;
2756                 }
2757         } else if ((sk->sk_state != SMC_ACTIVE) &&
2758                    (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2759                    (sk->sk_state != SMC_INIT)) {
2760                 rc = -EPIPE;
2761                 goto out;
2762         }
2763
2764         if (smc->use_fallback) {
2765                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2766         } else {
2767                 rc = smc_tx_sendmsg(smc, msg, len);
2768                 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2769         }
2770 out:
2771         release_sock(sk);
2772         return rc;
2773 }
2774
2775 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2776                        int flags)
2777 {
2778         struct sock *sk = sock->sk;
2779         struct smc_sock *smc;
2780         int rc = -ENOTCONN;
2781
2782         smc = smc_sk(sk);
2783         lock_sock(sk);
2784         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2785                 /* socket was connected before, no more data to read */
2786                 rc = 0;
2787                 goto out;
2788         }
2789         if ((sk->sk_state == SMC_INIT) ||
2790             (sk->sk_state == SMC_LISTEN) ||
2791             (sk->sk_state == SMC_CLOSED))
2792                 goto out;
2793
2794         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2795                 rc = 0;
2796                 goto out;
2797         }
2798
2799         if (smc->use_fallback) {
2800                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2801         } else {
2802                 msg->msg_namelen = 0;
2803                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2804                 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2805         }
2806
2807 out:
2808         release_sock(sk);
2809         return rc;
2810 }
2811
2812 static __poll_t smc_accept_poll(struct sock *parent)
2813 {
2814         struct smc_sock *isk = smc_sk(parent);
2815         __poll_t mask = 0;
2816
2817         spin_lock(&isk->accept_q_lock);
2818         if (!list_empty(&isk->accept_q))
2819                 mask = EPOLLIN | EPOLLRDNORM;
2820         spin_unlock(&isk->accept_q_lock);
2821
2822         return mask;
2823 }
2824
2825 static __poll_t smc_poll(struct file *file, struct socket *sock,
2826                              poll_table *wait)
2827 {
2828         struct sock *sk = sock->sk;
2829         struct smc_sock *smc;
2830         __poll_t mask = 0;
2831
2832         if (!sk)
2833                 return EPOLLNVAL;
2834
2835         smc = smc_sk(sock->sk);
2836         if (smc->use_fallback) {
2837                 /* delegate to CLC child sock */
2838                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2839                 sk->sk_err = smc->clcsock->sk->sk_err;
2840         } else {
2841                 if (sk->sk_state != SMC_CLOSED)
2842                         sock_poll_wait(file, sock, wait);
2843                 if (sk->sk_err)
2844                         mask |= EPOLLERR;
2845                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2846                     (sk->sk_state == SMC_CLOSED))
2847                         mask |= EPOLLHUP;
2848                 if (sk->sk_state == SMC_LISTEN) {
2849                         /* woken up by sk_data_ready in smc_listen_work() */
2850                         mask |= smc_accept_poll(sk);
2851                 } else if (smc->use_fallback) { /* as result of connect_work()*/
2852                         mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2853                                                            wait);
2854                         sk->sk_err = smc->clcsock->sk->sk_err;
2855                 } else {
2856                         if ((sk->sk_state != SMC_INIT &&
2857                              atomic_read(&smc->conn.sndbuf_space)) ||
2858                             sk->sk_shutdown & SEND_SHUTDOWN) {
2859                                 mask |= EPOLLOUT | EPOLLWRNORM;
2860                         } else {
2861                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2862                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2863                         }
2864                         if (atomic_read(&smc->conn.bytes_to_rcv))
2865                                 mask |= EPOLLIN | EPOLLRDNORM;
2866                         if (sk->sk_shutdown & RCV_SHUTDOWN)
2867                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2868                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
2869                                 mask |= EPOLLIN;
2870                         if (smc->conn.urg_state == SMC_URG_VALID)
2871                                 mask |= EPOLLPRI;
2872                 }
2873         }
2874
2875         return mask;
2876 }
2877
2878 static int smc_shutdown(struct socket *sock, int how)
2879 {
2880         struct sock *sk = sock->sk;
2881         bool do_shutdown = true;
2882         struct smc_sock *smc;
2883         int rc = -EINVAL;
2884         int old_state;
2885         int rc1 = 0;
2886
2887         smc = smc_sk(sk);
2888
2889         if ((how < SHUT_RD) || (how > SHUT_RDWR))
2890                 return rc;
2891
2892         lock_sock(sk);
2893
2894         if (sock->state == SS_CONNECTING) {
2895                 if (sk->sk_state == SMC_ACTIVE)
2896                         sock->state = SS_CONNECTED;
2897                 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2898                          sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2899                          sk->sk_state == SMC_APPCLOSEWAIT1 ||
2900                          sk->sk_state == SMC_APPCLOSEWAIT2 ||
2901                          sk->sk_state == SMC_APPFINCLOSEWAIT)
2902                         sock->state = SS_DISCONNECTING;
2903         }
2904
2905         rc = -ENOTCONN;
2906         if ((sk->sk_state != SMC_ACTIVE) &&
2907             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2908             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2909             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2910             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2911             (sk->sk_state != SMC_APPFINCLOSEWAIT))
2912                 goto out;
2913         if (smc->use_fallback) {
2914                 rc = kernel_sock_shutdown(smc->clcsock, how);
2915                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2916                 if (sk->sk_shutdown == SHUTDOWN_MASK) {
2917                         sk->sk_state = SMC_CLOSED;
2918                         sk->sk_socket->state = SS_UNCONNECTED;
2919                         sock_put(sk);
2920                 }
2921                 goto out;
2922         }
2923         switch (how) {
2924         case SHUT_RDWR:         /* shutdown in both directions */
2925                 old_state = sk->sk_state;
2926                 rc = smc_close_active(smc);
2927                 if (old_state == SMC_ACTIVE &&
2928                     sk->sk_state == SMC_PEERCLOSEWAIT1)
2929                         do_shutdown = false;
2930                 break;
2931         case SHUT_WR:
2932                 rc = smc_close_shutdown_write(smc);
2933                 break;
2934         case SHUT_RD:
2935                 rc = 0;
2936                 /* nothing more to do because peer is not involved */
2937                 break;
2938         }
2939         if (do_shutdown && smc->clcsock)
2940                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2941         /* map sock_shutdown_cmd constants to sk_shutdown value range */
2942         sk->sk_shutdown |= how + 1;
2943
2944         if (sk->sk_state == SMC_CLOSED)
2945                 sock->state = SS_UNCONNECTED;
2946         else
2947                 sock->state = SS_DISCONNECTING;
2948 out:
2949         release_sock(sk);
2950         return rc ? rc : rc1;
2951 }
2952
2953 static int __smc_getsockopt(struct socket *sock, int level, int optname,
2954                             char __user *optval, int __user *optlen)
2955 {
2956         struct smc_sock *smc;
2957         int val, len;
2958
2959         smc = smc_sk(sock->sk);
2960
2961         if (get_user(len, optlen))
2962                 return -EFAULT;
2963
2964         len = min_t(int, len, sizeof(int));
2965
2966         if (len < 0)
2967                 return -EINVAL;
2968
2969         switch (optname) {
2970         case SMC_LIMIT_HS:
2971                 val = smc->limit_smc_hs;
2972                 break;
2973         default:
2974                 return -EOPNOTSUPP;
2975         }
2976
2977         if (put_user(len, optlen))
2978                 return -EFAULT;
2979         if (copy_to_user(optval, &val, len))
2980                 return -EFAULT;
2981
2982         return 0;
2983 }
2984
2985 static int __smc_setsockopt(struct socket *sock, int level, int optname,
2986                             sockptr_t optval, unsigned int optlen)
2987 {
2988         struct sock *sk = sock->sk;
2989         struct smc_sock *smc;
2990         int val, rc;
2991
2992         smc = smc_sk(sk);
2993
2994         lock_sock(sk);
2995         switch (optname) {
2996         case SMC_LIMIT_HS:
2997                 if (optlen < sizeof(int)) {
2998                         rc = -EINVAL;
2999                         break;
3000                 }
3001                 if (copy_from_sockptr(&val, optval, sizeof(int))) {
3002                         rc = -EFAULT;
3003                         break;
3004                 }
3005
3006                 smc->limit_smc_hs = !!val;
3007                 rc = 0;
3008                 break;
3009         default:
3010                 rc = -EOPNOTSUPP;
3011                 break;
3012         }
3013         release_sock(sk);
3014
3015         return rc;
3016 }
3017
3018 static int smc_setsockopt(struct socket *sock, int level, int optname,
3019                           sockptr_t optval, unsigned int optlen)
3020 {
3021         struct sock *sk = sock->sk;
3022         struct smc_sock *smc;
3023         int val, rc;
3024
3025         if (level == SOL_TCP && optname == TCP_ULP)
3026                 return -EOPNOTSUPP;
3027         else if (level == SOL_SMC)
3028                 return __smc_setsockopt(sock, level, optname, optval, optlen);
3029
3030         smc = smc_sk(sk);
3031
3032         /* generic setsockopts reaching us here always apply to the
3033          * CLC socket
3034          */
3035         mutex_lock(&smc->clcsock_release_lock);
3036         if (!smc->clcsock) {
3037                 mutex_unlock(&smc->clcsock_release_lock);
3038                 return -EBADF;
3039         }
3040         if (unlikely(!smc->clcsock->ops->setsockopt))
3041                 rc = -EOPNOTSUPP;
3042         else
3043                 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
3044                                                    optval, optlen);
3045         if (smc->clcsock->sk->sk_err) {
3046                 sk->sk_err = smc->clcsock->sk->sk_err;
3047                 sk_error_report(sk);
3048         }
3049         mutex_unlock(&smc->clcsock_release_lock);
3050
3051         if (optlen < sizeof(int))
3052                 return -EINVAL;
3053         if (copy_from_sockptr(&val, optval, sizeof(int)))
3054                 return -EFAULT;
3055
3056         lock_sock(sk);
3057         if (rc || smc->use_fallback)
3058                 goto out;
3059         switch (optname) {
3060         case TCP_FASTOPEN:
3061         case TCP_FASTOPEN_CONNECT:
3062         case TCP_FASTOPEN_KEY:
3063         case TCP_FASTOPEN_NO_COOKIE:
3064                 /* option not supported by SMC */
3065                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
3066                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
3067                 } else {
3068                         rc = -EINVAL;
3069                 }
3070                 break;
3071         case TCP_NODELAY:
3072                 if (sk->sk_state != SMC_INIT &&
3073                     sk->sk_state != SMC_LISTEN &&
3074                     sk->sk_state != SMC_CLOSED) {
3075                         if (val) {
3076                                 SMC_STAT_INC(smc, ndly_cnt);
3077                                 smc_tx_pending(&smc->conn);
3078                                 cancel_delayed_work(&smc->conn.tx_work);
3079                         }
3080                 }
3081                 break;
3082         case TCP_CORK:
3083                 if (sk->sk_state != SMC_INIT &&
3084                     sk->sk_state != SMC_LISTEN &&
3085                     sk->sk_state != SMC_CLOSED) {
3086                         if (!val) {
3087                                 SMC_STAT_INC(smc, cork_cnt);
3088                                 smc_tx_pending(&smc->conn);
3089                                 cancel_delayed_work(&smc->conn.tx_work);
3090                         }
3091                 }
3092                 break;
3093         case TCP_DEFER_ACCEPT:
3094                 smc->sockopt_defer_accept = val;
3095                 break;
3096         default:
3097                 break;
3098         }
3099 out:
3100         release_sock(sk);
3101
3102         return rc;
3103 }
3104
3105 static int smc_getsockopt(struct socket *sock, int level, int optname,
3106                           char __user *optval, int __user *optlen)
3107 {
3108         struct smc_sock *smc;
3109         int rc;
3110
3111         if (level == SOL_SMC)
3112                 return __smc_getsockopt(sock, level, optname, optval, optlen);
3113
3114         smc = smc_sk(sock->sk);
3115         mutex_lock(&smc->clcsock_release_lock);
3116         if (!smc->clcsock) {
3117                 mutex_unlock(&smc->clcsock_release_lock);
3118                 return -EBADF;
3119         }
3120         /* socket options apply to the CLC socket */
3121         if (unlikely(!smc->clcsock->ops->getsockopt)) {
3122                 mutex_unlock(&smc->clcsock_release_lock);
3123                 return -EOPNOTSUPP;
3124         }
3125         rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
3126                                            optval, optlen);
3127         mutex_unlock(&smc->clcsock_release_lock);
3128         return rc;
3129 }
3130
3131 static int smc_ioctl(struct socket *sock, unsigned int cmd,
3132                      unsigned long arg)
3133 {
3134         union smc_host_cursor cons, urg;
3135         struct smc_connection *conn;
3136         struct smc_sock *smc;
3137         int answ;
3138
3139         smc = smc_sk(sock->sk);
3140         conn = &smc->conn;
3141         lock_sock(&smc->sk);
3142         if (smc->use_fallback) {
3143                 if (!smc->clcsock) {
3144                         release_sock(&smc->sk);
3145                         return -EBADF;
3146                 }
3147                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
3148                 release_sock(&smc->sk);
3149                 return answ;
3150         }
3151         switch (cmd) {
3152         case SIOCINQ: /* same as FIONREAD */
3153                 if (smc->sk.sk_state == SMC_LISTEN) {
3154                         release_sock(&smc->sk);
3155                         return -EINVAL;
3156                 }
3157                 if (smc->sk.sk_state == SMC_INIT ||
3158                     smc->sk.sk_state == SMC_CLOSED)
3159                         answ = 0;
3160                 else
3161                         answ = atomic_read(&smc->conn.bytes_to_rcv);
3162                 break;
3163         case SIOCOUTQ:
3164                 /* output queue size (not send + not acked) */
3165                 if (smc->sk.sk_state == SMC_LISTEN) {
3166                         release_sock(&smc->sk);
3167                         return -EINVAL;
3168                 }
3169                 if (smc->sk.sk_state == SMC_INIT ||
3170                     smc->sk.sk_state == SMC_CLOSED)
3171                         answ = 0;
3172                 else
3173                         answ = smc->conn.sndbuf_desc->len -
3174                                         atomic_read(&smc->conn.sndbuf_space);
3175                 break;
3176         case SIOCOUTQNSD:
3177                 /* output queue size (not send only) */
3178                 if (smc->sk.sk_state == SMC_LISTEN) {
3179                         release_sock(&smc->sk);
3180                         return -EINVAL;
3181                 }
3182                 if (smc->sk.sk_state == SMC_INIT ||
3183                     smc->sk.sk_state == SMC_CLOSED)
3184                         answ = 0;
3185                 else
3186                         answ = smc_tx_prepared_sends(&smc->conn);
3187                 break;
3188         case SIOCATMARK:
3189                 if (smc->sk.sk_state == SMC_LISTEN) {
3190                         release_sock(&smc->sk);
3191                         return -EINVAL;
3192                 }
3193                 if (smc->sk.sk_state == SMC_INIT ||
3194                     smc->sk.sk_state == SMC_CLOSED) {
3195                         answ = 0;
3196                 } else {
3197                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3198                         smc_curs_copy(&urg, &conn->urg_curs, conn);
3199                         answ = smc_curs_diff(conn->rmb_desc->len,
3200                                              &cons, &urg) == 1;
3201                 }
3202                 break;
3203         default:
3204                 release_sock(&smc->sk);
3205                 return -ENOIOCTLCMD;
3206         }
3207         release_sock(&smc->sk);
3208
3209         return put_user(answ, (int __user *)arg);
3210 }
3211
3212 /* Map the affected portions of the rmbe into an spd, note the number of bytes
3213  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3214  * updates till whenever a respective page has been fully processed.
3215  * Note that subsequent recv() calls have to wait till all splice() processing
3216  * completed.
3217  */
3218 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3219                                struct pipe_inode_info *pipe, size_t len,
3220                                unsigned int flags)
3221 {
3222         struct sock *sk = sock->sk;
3223         struct smc_sock *smc;
3224         int rc = -ENOTCONN;
3225
3226         smc = smc_sk(sk);
3227         lock_sock(sk);
3228         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3229                 /* socket was connected before, no more data to read */
3230                 rc = 0;
3231                 goto out;
3232         }
3233         if (sk->sk_state == SMC_INIT ||
3234             sk->sk_state == SMC_LISTEN ||
3235             sk->sk_state == SMC_CLOSED)
3236                 goto out;
3237
3238         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3239                 rc = 0;
3240                 goto out;
3241         }
3242
3243         if (smc->use_fallback) {
3244                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3245                                                     pipe, len, flags);
3246         } else {
3247                 if (*ppos) {
3248                         rc = -ESPIPE;
3249                         goto out;
3250                 }
3251                 if (flags & SPLICE_F_NONBLOCK)
3252                         flags = MSG_DONTWAIT;
3253                 else
3254                         flags = 0;
3255                 SMC_STAT_INC(smc, splice_cnt);
3256                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
3257         }
3258 out:
3259         release_sock(sk);
3260
3261         return rc;
3262 }
3263
3264 /* must look like tcp */
3265 static const struct proto_ops smc_sock_ops = {
3266         .family         = PF_SMC,
3267         .owner          = THIS_MODULE,
3268         .release        = smc_release,
3269         .bind           = smc_bind,
3270         .connect        = smc_connect,
3271         .socketpair     = sock_no_socketpair,
3272         .accept         = smc_accept,
3273         .getname        = smc_getname,
3274         .poll           = smc_poll,
3275         .ioctl          = smc_ioctl,
3276         .listen         = smc_listen,
3277         .shutdown       = smc_shutdown,
3278         .setsockopt     = smc_setsockopt,
3279         .getsockopt     = smc_getsockopt,
3280         .sendmsg        = smc_sendmsg,
3281         .recvmsg        = smc_recvmsg,
3282         .mmap           = sock_no_mmap,
3283         .splice_read    = smc_splice_read,
3284 };
3285
3286 static int __smc_create(struct net *net, struct socket *sock, int protocol,
3287                         int kern, struct socket *clcsock)
3288 {
3289         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
3290         struct smc_sock *smc;
3291         struct sock *sk;
3292         int rc;
3293
3294         rc = -ESOCKTNOSUPPORT;
3295         if (sock->type != SOCK_STREAM)
3296                 goto out;
3297
3298         rc = -EPROTONOSUPPORT;
3299         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
3300                 goto out;
3301
3302         rc = -ENOBUFS;
3303         sock->ops = &smc_sock_ops;
3304         sock->state = SS_UNCONNECTED;
3305         sk = smc_sock_alloc(net, sock, protocol);
3306         if (!sk)
3307                 goto out;
3308
3309         /* create internal TCP socket for CLC handshake and fallback */
3310         smc = smc_sk(sk);
3311         smc->use_fallback = false; /* assume rdma capability first */
3312         smc->fallback_rsn = 0;
3313
3314         /* default behavior from limit_smc_hs in every net namespace */
3315         smc->limit_smc_hs = net->smc.limit_smc_hs;
3316
3317         rc = 0;
3318         if (!clcsock) {
3319                 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3320                                       &smc->clcsock);
3321                 if (rc) {
3322                         sk_common_release(sk);
3323                         goto out;
3324                 }
3325
3326                 /* smc_clcsock_release() does not wait smc->clcsock->sk's
3327                  * destruction;  its sk_state might not be TCP_CLOSE after
3328                  * smc->sk is close()d, and TCP timers can be fired later,
3329                  * which need net ref.
3330                  */
3331                 sk = smc->clcsock->sk;
3332                 __netns_tracker_free(net, &sk->ns_tracker, false);
3333                 sk->sk_net_refcnt = 1;
3334                 get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
3335                 sock_inuse_add(net, 1);
3336         } else {
3337                 smc->clcsock = clcsock;
3338         }
3339
3340 out:
3341         return rc;
3342 }
3343
3344 static int smc_create(struct net *net, struct socket *sock, int protocol,
3345                       int kern)
3346 {
3347         return __smc_create(net, sock, protocol, kern, NULL);
3348 }
3349
3350 static const struct net_proto_family smc_sock_family_ops = {
3351         .family = PF_SMC,
3352         .owner  = THIS_MODULE,
3353         .create = smc_create,
3354 };
3355
3356 static int smc_ulp_init(struct sock *sk)
3357 {
3358         struct socket *tcp = sk->sk_socket;
3359         struct net *net = sock_net(sk);
3360         struct socket *smcsock;
3361         int protocol, ret;
3362
3363         /* only TCP can be replaced */
3364         if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3365             (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3366                 return -ESOCKTNOSUPPORT;
3367         /* don't handle wq now */
3368         if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3369                 return -ENOTCONN;
3370
3371         if (sk->sk_family == AF_INET)
3372                 protocol = SMCPROTO_SMC;
3373         else
3374                 protocol = SMCPROTO_SMC6;
3375
3376         smcsock = sock_alloc();
3377         if (!smcsock)
3378                 return -ENFILE;
3379
3380         smcsock->type = SOCK_STREAM;
3381         __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3382         ret = __smc_create(net, smcsock, protocol, 1, tcp);
3383         if (ret) {
3384                 sock_release(smcsock); /* module_put() which ops won't be NULL */
3385                 return ret;
3386         }
3387
3388         /* replace tcp socket to smc */
3389         smcsock->file = tcp->file;
3390         smcsock->file->private_data = smcsock;
3391         smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3392         smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3393         tcp->file = NULL;
3394
3395         return ret;
3396 }
3397
3398 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3399                           const gfp_t priority)
3400 {
3401         struct inet_connection_sock *icsk = inet_csk(newsk);
3402
3403         /* don't inherit ulp ops to child when listen */
3404         icsk->icsk_ulp_ops = NULL;
3405 }
3406
3407 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3408         .name           = "smc",
3409         .owner          = THIS_MODULE,
3410         .init           = smc_ulp_init,
3411         .clone          = smc_ulp_clone,
3412 };
3413
3414 unsigned int smc_net_id;
3415
3416 static __net_init int smc_net_init(struct net *net)
3417 {
3418         int rc;
3419
3420         rc = smc_sysctl_net_init(net);
3421         if (rc)
3422                 return rc;
3423         return smc_pnet_net_init(net);
3424 }
3425
3426 static void __net_exit smc_net_exit(struct net *net)
3427 {
3428         smc_sysctl_net_exit(net);
3429         smc_pnet_net_exit(net);
3430 }
3431
3432 static __net_init int smc_net_stat_init(struct net *net)
3433 {
3434         return smc_stats_init(net);
3435 }
3436
3437 static void __net_exit smc_net_stat_exit(struct net *net)
3438 {
3439         smc_stats_exit(net);
3440 }
3441
3442 static struct pernet_operations smc_net_ops = {
3443         .init = smc_net_init,
3444         .exit = smc_net_exit,
3445         .id   = &smc_net_id,
3446         .size = sizeof(struct smc_net),
3447 };
3448
3449 static struct pernet_operations smc_net_stat_ops = {
3450         .init = smc_net_stat_init,
3451         .exit = smc_net_stat_exit,
3452 };
3453
3454 static int __init smc_init(void)
3455 {
3456         int rc;
3457
3458         rc = register_pernet_subsys(&smc_net_ops);
3459         if (rc)
3460                 return rc;
3461
3462         rc = register_pernet_subsys(&smc_net_stat_ops);
3463         if (rc)
3464                 goto out_pernet_subsys;
3465
3466         rc = smc_ism_init();
3467         if (rc)
3468                 goto out_pernet_subsys_stat;
3469         smc_clc_init();
3470
3471         rc = smc_nl_init();
3472         if (rc)
3473                 goto out_ism;
3474
3475         rc = smc_pnet_init();
3476         if (rc)
3477                 goto out_nl;
3478
3479         rc = -ENOMEM;
3480
3481         smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3482         if (!smc_tcp_ls_wq)
3483                 goto out_pnet;
3484
3485         smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3486         if (!smc_hs_wq)
3487                 goto out_alloc_tcp_ls_wq;
3488
3489         smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3490         if (!smc_close_wq)
3491                 goto out_alloc_hs_wq;
3492
3493         rc = smc_core_init();
3494         if (rc) {
3495                 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
3496                 goto out_alloc_wqs;
3497         }
3498
3499         rc = smc_llc_init();
3500         if (rc) {
3501                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
3502                 goto out_core;
3503         }
3504
3505         rc = smc_cdc_init();
3506         if (rc) {
3507                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
3508                 goto out_core;
3509         }
3510
3511         rc = proto_register(&smc_proto, 1);
3512         if (rc) {
3513                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
3514                 goto out_core;
3515         }
3516
3517         rc = proto_register(&smc_proto6, 1);
3518         if (rc) {
3519                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3520                 goto out_proto;
3521         }
3522
3523         rc = sock_register(&smc_sock_family_ops);
3524         if (rc) {
3525                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
3526                 goto out_proto6;
3527         }
3528         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
3529         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
3530
3531         rc = smc_ib_register_client();
3532         if (rc) {
3533                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3534                 goto out_sock;
3535         }
3536
3537         rc = tcp_register_ulp(&smc_ulp_ops);
3538         if (rc) {
3539                 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
3540                 goto out_ib;
3541         }
3542
3543         static_branch_enable(&tcp_have_smc);
3544         return 0;
3545
3546 out_ib:
3547         smc_ib_unregister_client();
3548 out_sock:
3549         sock_unregister(PF_SMC);
3550 out_proto6:
3551         proto_unregister(&smc_proto6);
3552 out_proto:
3553         proto_unregister(&smc_proto);
3554 out_core:
3555         smc_core_exit();
3556 out_alloc_wqs:
3557         destroy_workqueue(smc_close_wq);
3558 out_alloc_hs_wq:
3559         destroy_workqueue(smc_hs_wq);
3560 out_alloc_tcp_ls_wq:
3561         destroy_workqueue(smc_tcp_ls_wq);
3562 out_pnet:
3563         smc_pnet_exit();
3564 out_nl:
3565         smc_nl_exit();
3566 out_ism:
3567         smc_clc_exit();
3568         smc_ism_exit();
3569 out_pernet_subsys_stat:
3570         unregister_pernet_subsys(&smc_net_stat_ops);
3571 out_pernet_subsys:
3572         unregister_pernet_subsys(&smc_net_ops);
3573
3574         return rc;
3575 }
3576
3577 static void __exit smc_exit(void)
3578 {
3579         static_branch_disable(&tcp_have_smc);
3580         tcp_unregister_ulp(&smc_ulp_ops);
3581         sock_unregister(PF_SMC);
3582         smc_core_exit();
3583         smc_ib_unregister_client();
3584         smc_ism_exit();
3585         destroy_workqueue(smc_close_wq);
3586         destroy_workqueue(smc_tcp_ls_wq);
3587         destroy_workqueue(smc_hs_wq);
3588         proto_unregister(&smc_proto6);
3589         proto_unregister(&smc_proto);
3590         smc_pnet_exit();
3591         smc_nl_exit();
3592         smc_clc_exit();
3593         unregister_pernet_subsys(&smc_net_stat_ops);
3594         unregister_pernet_subsys(&smc_net_ops);
3595         rcu_barrier();
3596 }
3597
3598 module_init(smc_init);
3599 module_exit(smc_exit);
3600
3601 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
3602 MODULE_DESCRIPTION("smc socket address family");
3603 MODULE_LICENSE("GPL");
3604 MODULE_ALIAS_NETPROTO(PF_SMC);
3605 MODULE_ALIAS_TCP_ULP("smc");
3606 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);