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 = READ_ONCE(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_first_contact_ext *fce;
 681         int clc_v2_len;
 682
 683         if (clc->hdr.version == SMC_V1 ||
 684             !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
 685                 return;
 686
 687         if (smc->conn.lgr->is_smcd) {
 688                 memcpy(smc->conn.lgr->negotiated_eid, clc->d1.eid,
 689                        SMC_MAX_EID_LEN);
 690                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, d1);
 691         } else {
 692                 memcpy(smc->conn.lgr->negotiated_eid, clc->r1.eid,
 693                        SMC_MAX_EID_LEN);
 694                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, r1);
 695         }
 696         fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len);
 697         smc->conn.lgr->peer_os = fce->os_type;
 698         smc->conn.lgr->peer_smc_release = fce->release;
 699         if (smc_isascii(fce->hostname))
 700                 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
 701                        SMC_MAX_HOSTNAME_LEN);
 702 }
 703
 704 static void smcr_conn_save_peer_info(struct smc_sock *smc,
 705                                      struct smc_clc_msg_accept_confirm *clc)
 706 {
 707         int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
 708
 709         smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
 710         smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
 711         smc->conn.peer_rmbe_size = bufsize;
 712         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 713         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
 714 }
 715
 716 static void smcd_conn_save_peer_info(struct smc_sock *smc,
 717                                      struct smc_clc_msg_accept_confirm *clc)
 718 {
 719         int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
 720
 721         smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
 722         smc->conn.peer_token = ntohll(clc->d0.token);
 723         /* msg header takes up space in the buffer */
 724         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
 725         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 726         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
 727 }
 728
 729 static void smc_conn_save_peer_info(struct smc_sock *smc,
 730                                     struct smc_clc_msg_accept_confirm *clc)
 731 {
 732         if (smc->conn.lgr->is_smcd)
 733                 smcd_conn_save_peer_info(smc, clc);
 734         else
 735                 smcr_conn_save_peer_info(smc, clc);
 736         smc_conn_save_peer_info_fce(smc, clc);
 737 }
 738
 739 static void smc_link_save_peer_info(struct smc_link *link,
 740                                     struct smc_clc_msg_accept_confirm *clc,
 741                                     struct smc_init_info *ini)
 742 {
 743         link->peer_qpn = ntoh24(clc->r0.qpn);
 744         memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
 745         memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
 746         link->peer_psn = ntoh24(clc->r0.psn);
 747         link->peer_mtu = clc->r0.qp_mtu;
 748 }
 749
 750 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
 751                                        struct smc_stats_fback *fback_arr)
 752 {
 753         int cnt;
 754
 755         for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
 756                 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
 757                         fback_arr[cnt].count++;
 758                         break;
 759                 }
 760                 if (!fback_arr[cnt].fback_code) {
 761                         fback_arr[cnt].fback_code = smc->fallback_rsn;
 762                         fback_arr[cnt].count++;
 763                         break;
 764                 }
 765         }
 766 }
 767
 768 static void smc_stat_fallback(struct smc_sock *smc)
 769 {
 770         struct net *net = sock_net(&smc->sk);
 771
 772         mutex_lock(&net->smc.mutex_fback_rsn);
 773         if (smc->listen_smc) {
 774                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
 775                 net->smc.fback_rsn->srv_fback_cnt++;
 776         } else {
 777                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
 778                 net->smc.fback_rsn->clnt_fback_cnt++;
 779         }
 780         mutex_unlock(&net->smc.mutex_fback_rsn);
 781 }
 782
 783 /* must be called under rcu read lock */
 784 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
 785 {
 786         struct socket_wq *wq;
 787         __poll_t flags;
 788
 789         wq = rcu_dereference(smc->sk.sk_wq);
 790         if (!skwq_has_sleeper(wq))
 791                 return;
 792
 793         /* wake up smc sk->sk_wq */
 794         if (!key) {
 795                 /* sk_state_change */
 796                 wake_up_interruptible_all(&wq->wait);
 797         } else {
 798                 flags = key_to_poll(key);
 799                 if (flags & (EPOLLIN | EPOLLOUT))
 800                         /* sk_data_ready or sk_write_space */
 801                         wake_up_interruptible_sync_poll(&wq->wait, flags);
 802                 else if (flags & EPOLLERR)
 803                         /* sk_error_report */
 804                         wake_up_interruptible_poll(&wq->wait, flags);
 805         }
 806 }
 807
 808 static int smc_fback_mark_woken(wait_queue_entry_t *wait,
 809                                 unsigned int mode, int sync, void *key)
 810 {
 811         struct smc_mark_woken *mark =
 812                 container_of(wait, struct smc_mark_woken, wait_entry);
 813
 814         mark->woken = true;
 815         mark->key = key;
 816         return 0;
 817 }
 818
 819 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
 820                                      void (*clcsock_callback)(struct sock *sk))
 821 {
 822         struct smc_mark_woken mark = { .woken = false };
 823         struct socket_wq *wq;
 824
 825         init_waitqueue_func_entry(&mark.wait_entry,
 826                                   smc_fback_mark_woken);
 827         rcu_read_lock();
 828         wq = rcu_dereference(clcsk->sk_wq);
 829         if (!wq)
 830                 goto out;
 831         add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 832         clcsock_callback(clcsk);
 833         remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 834
 835         if (mark.woken)
 836                 smc_fback_wakeup_waitqueue(smc, mark.key);
 837 out:
 838         rcu_read_unlock();
 839 }
 840
 841 static void smc_fback_state_change(struct sock *clcsk)
 842 {
 843         struct smc_sock *smc;
 844
 845         read_lock_bh(&clcsk->sk_callback_lock);
 846         smc = smc_clcsock_user_data(clcsk);
 847         if (smc)
 848                 smc_fback_forward_wakeup(smc, clcsk,
 849                                          smc->clcsk_state_change);
 850         read_unlock_bh(&clcsk->sk_callback_lock);
 851 }
 852
 853 static void smc_fback_data_ready(struct sock *clcsk)
 854 {
 855         struct smc_sock *smc;
 856
 857         read_lock_bh(&clcsk->sk_callback_lock);
 858         smc = smc_clcsock_user_data(clcsk);
 859         if (smc)
 860                 smc_fback_forward_wakeup(smc, clcsk,
 861                                          smc->clcsk_data_ready);
 862         read_unlock_bh(&clcsk->sk_callback_lock);
 863 }
 864
 865 static void smc_fback_write_space(struct sock *clcsk)
 866 {
 867         struct smc_sock *smc;
 868
 869         read_lock_bh(&clcsk->sk_callback_lock);
 870         smc = smc_clcsock_user_data(clcsk);
 871         if (smc)
 872                 smc_fback_forward_wakeup(smc, clcsk,
 873                                          smc->clcsk_write_space);
 874         read_unlock_bh(&clcsk->sk_callback_lock);
 875 }
 876
 877 static void smc_fback_error_report(struct sock *clcsk)
 878 {
 879         struct smc_sock *smc;
 880
 881         read_lock_bh(&clcsk->sk_callback_lock);
 882         smc = smc_clcsock_user_data(clcsk);
 883         if (smc)
 884                 smc_fback_forward_wakeup(smc, clcsk,
 885                                          smc->clcsk_error_report);
 886         read_unlock_bh(&clcsk->sk_callback_lock);
 887 }
 888
 889 static void smc_fback_replace_callbacks(struct smc_sock *smc)
 890 {
 891         struct sock *clcsk = smc->clcsock->sk;
 892
 893         write_lock_bh(&clcsk->sk_callback_lock);
 894         clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
 895
 896         smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
 897                                &smc->clcsk_state_change);
 898         smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
 899                                &smc->clcsk_data_ready);
 900         smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
 901                                &smc->clcsk_write_space);
 902         smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
 903                                &smc->clcsk_error_report);
 904
 905         write_unlock_bh(&clcsk->sk_callback_lock);
 906 }
 907
 908 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
 909 {
 910         int rc = 0;
 911
 912         mutex_lock(&smc->clcsock_release_lock);
 913         if (!smc->clcsock) {
 914                 rc = -EBADF;
 915                 goto out;
 916         }
 917
 918         smc->use_fallback = true;
 919         smc->fallback_rsn = reason_code;
 920         smc_stat_fallback(smc);
 921         trace_smc_switch_to_fallback(smc, reason_code);
 922         if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
 923                 smc->clcsock->file = smc->sk.sk_socket->file;
 924                 smc->clcsock->file->private_data = smc->clcsock;
 925                 smc->clcsock->wq.fasync_list =
 926                         smc->sk.sk_socket->wq.fasync_list;
 927                 smc->sk.sk_socket->wq.fasync_list = NULL;
 928
 929                 /* There might be some wait entries remaining
 930                  * in smc sk->sk_wq and they should be woken up
 931                  * as clcsock's wait queue is woken up.
 932                  */
 933                 smc_fback_replace_callbacks(smc);
 934         }
 935 out:
 936         mutex_unlock(&smc->clcsock_release_lock);
 937         return rc;
 938 }
 939
 940 /* fall back during connect */
 941 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 942 {
 943         struct net *net = sock_net(&smc->sk);
 944         int rc = 0;
 945
 946         rc = smc_switch_to_fallback(smc, reason_code);
 947         if (rc) { /* fallback fails */
 948                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 949                 if (smc->sk.sk_state == SMC_INIT)
 950                         sock_put(&smc->sk); /* passive closing */
 951                 return rc;
 952         }
 953         smc_copy_sock_settings_to_clc(smc);
 954         smc->connect_nonblock = 0;
 955         if (smc->sk.sk_state == SMC_INIT)
 956                 smc->sk.sk_state = SMC_ACTIVE;
 957         return 0;
 958 }
 959
 960 /* decline and fall back during connect */
 961 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 962                                         u8 version)
 963 {
 964         struct net *net = sock_net(&smc->sk);
 965         int rc;
 966
 967         if (reason_code < 0) { /* error, fallback is not possible */
 968                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 969                 if (smc->sk.sk_state == SMC_INIT)
 970                         sock_put(&smc->sk); /* passive closing */
 971                 return reason_code;
 972         }
 973         if (reason_code != SMC_CLC_DECL_PEERDECL) {
 974                 rc = smc_clc_send_decline(smc, reason_code, version);
 975                 if (rc < 0) {
 976                         this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 977                         if (smc->sk.sk_state == SMC_INIT)
 978                                 sock_put(&smc->sk); /* passive closing */
 979                         return rc;
 980                 }
 981         }
 982         return smc_connect_fallback(smc, reason_code);
 983 }
 984
 985 static void smc_conn_abort(struct smc_sock *smc, int local_first)
 986 {
 987         struct smc_connection *conn = &smc->conn;
 988         struct smc_link_group *lgr = conn->lgr;
 989         bool lgr_valid = false;
 990
 991         if (smc_conn_lgr_valid(conn))
 992                 lgr_valid = true;
 993
 994         smc_conn_free(conn);
 995         if (local_first && lgr_valid)
 996                 smc_lgr_cleanup_early(lgr);
 997 }
 998
 999 /* check if there is a rdma device available for this connection. */
1000 /* called for connect and listen */
1001 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
1002 {
1003         /* PNET table look up: search active ib_device and port
1004          * within same PNETID that also contains the ethernet device
1005          * used for the internal TCP socket
1006          */
1007         smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
1008         if (!ini->check_smcrv2 && !ini->ib_dev)
1009                 return SMC_CLC_DECL_NOSMCRDEV;
1010         if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
1011                 return SMC_CLC_DECL_NOSMCRDEV;
1012         return 0;
1013 }
1014
1015 /* check if there is an ISM device available for this connection. */
1016 /* called for connect and listen */
1017 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
1018 {
1019         /* Find ISM device with same PNETID as connecting interface  */
1020         smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
1021         if (!ini->ism_dev[0])
1022                 return SMC_CLC_DECL_NOSMCDDEV;
1023         else
1024                 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
1025         return 0;
1026 }
1027
1028 /* is chid unique for the ism devices that are already determined? */
1029 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
1030                                            int cnt)
1031 {
1032         int i = (!ini->ism_dev[0]) ? 1 : 0;
1033
1034         for (; i < cnt; i++)
1035                 if (ini->ism_chid[i] == chid)
1036                         return false;
1037         return true;
1038 }
1039
1040 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
1041  * PNETID matching net_device)
1042  */
1043 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
1044                                        struct smc_init_info *ini)
1045 {
1046         int rc = SMC_CLC_DECL_NOSMCDDEV;
1047         struct smcd_dev *smcd;
1048         int i = 1, entry = 1;
1049         bool is_emulated;
1050         u16 chid;
1051
1052         if (smcd_indicated(ini->smc_type_v1))
1053                 rc = 0;         /* already initialized for V1 */
1054         mutex_lock(&smcd_dev_list.mutex);
1055         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1056                 if (smcd->going_away || smcd == ini->ism_dev[0])
1057                         continue;
1058                 chid = smc_ism_get_chid(smcd);
1059                 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
1060                         continue;
1061                 is_emulated = __smc_ism_is_emulated(chid);
1062                 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
1063                     smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
1064                         if (is_emulated && entry == SMCD_CLC_MAX_V2_GID_ENTRIES)
1065                                 /* It's the last GID-CHID entry left in CLC
1066                                  * Proposal SMC-Dv2 extension, but an Emulated-
1067                                  * ISM device will take two entries. So give
1068                                  * up it and try the next potential ISM device.
1069                                  */
1070                                 continue;
1071                         ini->ism_dev[i] = smcd;
1072                         ini->ism_chid[i] = chid;
1073                         ini->is_smcd = true;
1074                         rc = 0;
1075                         i++;
1076                         entry = is_emulated ? entry + 2 : entry + 1;
1077                         if (entry > SMCD_CLC_MAX_V2_GID_ENTRIES)
1078                                 break;
1079                 }
1080         }
1081         mutex_unlock(&smcd_dev_list.mutex);
1082         ini->ism_offered_cnt = i - 1;
1083         if (!ini->ism_dev[0] && !ini->ism_dev[1])
1084                 ini->smcd_version = 0;
1085
1086         return rc;
1087 }
1088
1089 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
1090 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
1091                                       struct smc_init_info *ini)
1092 {
1093         if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
1094                 return SMC_CLC_DECL_ISMVLANERR;
1095         return 0;
1096 }
1097
1098 static int smc_find_proposal_devices(struct smc_sock *smc,
1099                                      struct smc_init_info *ini)
1100 {
1101         int rc = 0;
1102
1103         /* check if there is an ism device available */
1104         if (!(ini->smcd_version & SMC_V1) ||
1105             smc_find_ism_device(smc, ini) ||
1106             smc_connect_ism_vlan_setup(smc, ini))
1107                 ini->smcd_version &= ~SMC_V1;
1108         /* else ISM V1 is supported for this connection */
1109
1110         /* check if there is an rdma device available */
1111         if (!(ini->smcr_version & SMC_V1) ||
1112             smc_find_rdma_device(smc, ini))
1113                 ini->smcr_version &= ~SMC_V1;
1114         /* else RDMA is supported for this connection */
1115
1116         ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1117                                               ini->smcr_version & SMC_V1);
1118
1119         /* check if there is an ism v2 device available */
1120         if (!(ini->smcd_version & SMC_V2) ||
1121             !smc_ism_is_v2_capable() ||
1122             smc_find_ism_v2_device_clnt(smc, ini))
1123                 ini->smcd_version &= ~SMC_V2;
1124
1125         /* check if there is an rdma v2 device available */
1126         ini->check_smcrv2 = true;
1127         ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1128         if (!(ini->smcr_version & SMC_V2) ||
1129             smc->clcsock->sk->sk_family != AF_INET ||
1130             !smc_clc_ueid_count() ||
1131             smc_find_rdma_device(smc, ini))
1132                 ini->smcr_version &= ~SMC_V2;
1133         ini->check_smcrv2 = false;
1134
1135         ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1136                                               ini->smcr_version & SMC_V2);
1137
1138         /* if neither ISM nor RDMA are supported, fallback */
1139         if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
1140                 rc = SMC_CLC_DECL_NOSMCDEV;
1141
1142         return rc;
1143 }
1144
1145 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1146  * used, the VLAN ID will be registered again during the connection setup.
1147  */
1148 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
1149                                         struct smc_init_info *ini)
1150 {
1151         if (!smcd_indicated(ini->smc_type_v1))
1152                 return 0;
1153         if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
1154                 return SMC_CLC_DECL_CNFERR;
1155         return 0;
1156 }
1157
1158 #define SMC_CLC_MAX_ACCEPT_LEN \
1159         (sizeof(struct smc_clc_msg_accept_confirm) + \
1160          sizeof(struct smc_clc_first_contact_ext_v2x) + \
1161          sizeof(struct smc_clc_msg_trail))
1162
1163 /* CLC handshake during connect */
1164 static int smc_connect_clc(struct smc_sock *smc,
1165                            struct smc_clc_msg_accept_confirm *aclc,
1166                            struct smc_init_info *ini)
1167 {
1168         int rc = 0;
1169
1170         /* do inband token exchange */
1171         rc = smc_clc_send_proposal(smc, ini);
1172         if (rc)
1173                 return rc;
1174         /* receive SMC Accept CLC message */
1175         return smc_clc_wait_msg(smc, aclc, SMC_CLC_MAX_ACCEPT_LEN,
1176                                 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
1177 }
1178
1179 void smc_fill_gid_list(struct smc_link_group *lgr,
1180                        struct smc_gidlist *gidlist,
1181                        struct smc_ib_device *known_dev, u8 *known_gid)
1182 {
1183         struct smc_init_info *alt_ini = NULL;
1184
1185         memset(gidlist, 0, sizeof(*gidlist));
1186         memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1187
1188         alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1189         if (!alt_ini)
1190                 goto out;
1191
1192         alt_ini->vlan_id = lgr->vlan_id;
1193         alt_ini->check_smcrv2 = true;
1194         alt_ini->smcrv2.saddr = lgr->saddr;
1195         smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1196
1197         if (!alt_ini->smcrv2.ib_dev_v2)
1198                 goto out;
1199
1200         memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1201                SMC_GID_SIZE);
1202
1203 out:
1204         kfree(alt_ini);
1205 }
1206
1207 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1208                                        struct smc_clc_msg_accept_confirm *aclc,
1209                                        struct smc_init_info *ini)
1210 {
1211         struct smc_clc_first_contact_ext *fce =
1212                 smc_get_clc_first_contact_ext(aclc, false);
1213         struct net *net = sock_net(&smc->sk);
1214         int rc;
1215
1216         if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1217                 return 0;
1218
1219         if (fce->v2_direct) {
1220                 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1221                 ini->smcrv2.uses_gateway = false;
1222         } else {
1223                 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr,
1224                                       smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1225                                       ini->smcrv2.nexthop_mac,
1226                                       &ini->smcrv2.uses_gateway))
1227                         return SMC_CLC_DECL_NOROUTE;
1228                 if (!ini->smcrv2.uses_gateway) {
1229                         /* mismatch: peer claims indirect, but its direct */
1230                         return SMC_CLC_DECL_NOINDIRECT;
1231                 }
1232         }
1233
1234         ini->release_nr = fce->release;
1235         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1236         if (rc)
1237                 return rc;
1238
1239         return 0;
1240 }
1241
1242 /* setup for RDMA connection of client */
1243 static int smc_connect_rdma(struct smc_sock *smc,
1244                             struct smc_clc_msg_accept_confirm *aclc,
1245                             struct smc_init_info *ini)
1246 {
1247         int i, reason_code = 0;
1248         struct smc_link *link;
1249         u8 *eid = NULL;
1250
1251         ini->is_smcd = false;
1252         ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
1253         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1254         memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1255         memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1256         memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
1257         ini->max_conns = SMC_CONN_PER_LGR_MAX;
1258         ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1259
1260         reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1261         if (reason_code)
1262                 return reason_code;
1263
1264         mutex_lock(&smc_client_lgr_pending);
1265         reason_code = smc_conn_create(smc, ini);
1266         if (reason_code) {
1267                 mutex_unlock(&smc_client_lgr_pending);
1268                 return reason_code;
1269         }
1270
1271         smc_conn_save_peer_info(smc, aclc);
1272
1273         if (ini->first_contact_local) {
1274                 link = smc->conn.lnk;
1275         } else {
1276                 /* set link that was assigned by server */
1277                 link = NULL;
1278                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1279                         struct smc_link *l = &smc->conn.lgr->lnk[i];
1280
1281                         if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1282                             !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1283                                     SMC_GID_SIZE) &&
1284                             (aclc->hdr.version > SMC_V1 ||
1285                              !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1286                                      sizeof(l->peer_mac)))) {
1287                                 link = l;
1288                                 break;
1289                         }
1290                 }
1291                 if (!link) {
1292                         reason_code = SMC_CLC_DECL_NOSRVLINK;
1293                         goto connect_abort;
1294                 }
1295                 smc_switch_link_and_count(&smc->conn, link);
1296         }
1297
1298         /* create send buffer and rmb */
1299         if (smc_buf_create(smc, false)) {
1300                 reason_code = SMC_CLC_DECL_MEM;
1301                 goto connect_abort;
1302         }
1303
1304         if (ini->first_contact_local)
1305                 smc_link_save_peer_info(link, aclc, ini);
1306
1307         if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1308                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1309                 goto connect_abort;
1310         }
1311
1312         smc_close_init(smc);
1313         smc_rx_init(smc);
1314
1315         if (ini->first_contact_local) {
1316                 if (smc_ib_ready_link(link)) {
1317                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1318                         goto connect_abort;
1319                 }
1320         } else {
1321                 /* reg sendbufs if they were vzalloced */
1322                 if (smc->conn.sndbuf_desc->is_vm) {
1323                         if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) {
1324                                 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1325                                 goto connect_abort;
1326                         }
1327                 }
1328                 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
1329                         reason_code = SMC_CLC_DECL_ERR_REGBUF;
1330                         goto connect_abort;
1331                 }
1332         }
1333
1334         if (aclc->hdr.version > SMC_V1) {
1335                 eid = aclc->r1.eid;
1336                 if (ini->first_contact_local)
1337                         smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1338                                           link->smcibdev, link->gid);
1339         }
1340
1341         reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
1342                                            aclc->hdr.version, eid, ini);
1343         if (reason_code)
1344                 goto connect_abort;
1345
1346         smc_tx_init(smc);
1347
1348         if (ini->first_contact_local) {
1349                 /* QP confirmation over RoCE fabric */
1350                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1351                 reason_code = smcr_clnt_conf_first_link(smc);
1352                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1353                 if (reason_code)
1354                         goto connect_abort;
1355         }
1356         mutex_unlock(&smc_client_lgr_pending);
1357
1358         smc_copy_sock_settings_to_clc(smc);
1359         smc->connect_nonblock = 0;
1360         if (smc->sk.sk_state == SMC_INIT)
1361                 smc->sk.sk_state = SMC_ACTIVE;
1362
1363         return 0;
1364 connect_abort:
1365         smc_conn_abort(smc, ini->first_contact_local);
1366         mutex_unlock(&smc_client_lgr_pending);
1367         smc->connect_nonblock = 0;
1368
1369         return reason_code;
1370 }
1371
1372 /* The server has chosen one of the proposed ISM devices for the communication.
1373  * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1374  */
1375 static int
1376 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm *aclc,
1377                                struct smc_init_info *ini)
1378 {
1379         int i;
1380
1381         for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
1382                 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
1383                         ini->ism_selected = i;
1384                         return 0;
1385                 }
1386         }
1387
1388         return -EPROTO;
1389 }
1390
1391 /* setup for ISM connection of client */
1392 static int smc_connect_ism(struct smc_sock *smc,
1393                            struct smc_clc_msg_accept_confirm *aclc,
1394                            struct smc_init_info *ini)
1395 {
1396         u8 *eid = NULL;
1397         int rc = 0;
1398
1399         ini->is_smcd = true;
1400         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1401
1402         if (aclc->hdr.version == SMC_V2) {
1403                 if (ini->first_contact_peer) {
1404                         struct smc_clc_first_contact_ext *fce =
1405                                 smc_get_clc_first_contact_ext(aclc, true);
1406
1407                         ini->release_nr = fce->release;
1408                         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1409                         if (rc)
1410                                 return rc;
1411                 }
1412
1413                 rc = smc_v2_determine_accepted_chid(aclc, ini);
1414                 if (rc)
1415                         return rc;
1416
1417                 if (__smc_ism_is_emulated(ini->ism_chid[ini->ism_selected]))
1418                         ini->ism_peer_gid[ini->ism_selected].gid_ext =
1419                                                 ntohll(aclc->d1.gid_ext);
1420                 /* for non-Emulated-ISM devices, peer gid_ext remains 0. */
1421         }
1422         ini->ism_peer_gid[ini->ism_selected].gid = ntohll(aclc->d0.gid);
1423
1424         /* there is only one lgr role for SMC-D; use server lock */
1425         mutex_lock(&smc_server_lgr_pending);
1426         rc = smc_conn_create(smc, ini);
1427         if (rc) {
1428                 mutex_unlock(&smc_server_lgr_pending);
1429                 return rc;
1430         }
1431
1432         /* Create send and receive buffers */
1433         rc = smc_buf_create(smc, true);
1434         if (rc) {
1435                 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1436                 goto connect_abort;
1437         }
1438
1439         smc_conn_save_peer_info(smc, aclc);
1440         smc_close_init(smc);
1441         smc_rx_init(smc);
1442         smc_tx_init(smc);
1443
1444         if (aclc->hdr.version > SMC_V1)
1445                 eid = aclc->d1.eid;
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 *aclc;
1497         struct smc_init_info *ini = NULL;
1498         u8 *buf = NULL;
1499         int rc = 0;
1500
1501         if (smc->use_fallback)
1502                 return smc_connect_fallback(smc, smc->fallback_rsn);
1503
1504         /* if peer has not signalled SMC-capability, fall back */
1505         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
1506                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
1507
1508         /* IPSec connections opt out of SMC optimizations */
1509         if (using_ipsec(smc))
1510                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1511                                                     version);
1512
1513         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1514         if (!ini)
1515                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1516                                                     version);
1517
1518         ini->smcd_version = SMC_V1 | SMC_V2;
1519         ini->smcr_version = SMC_V1 | SMC_V2;
1520         ini->smc_type_v1 = SMC_TYPE_B;
1521         ini->smc_type_v2 = SMC_TYPE_B;
1522
1523         /* get vlan id from IP device */
1524         if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
1525                 ini->smcd_version &= ~SMC_V1;
1526                 ini->smcr_version = 0;
1527                 ini->smc_type_v1 = SMC_TYPE_N;
1528                 if (!ini->smcd_version) {
1529                         rc = SMC_CLC_DECL_GETVLANERR;
1530                         goto fallback;
1531                 }
1532         }
1533
1534         rc = smc_find_proposal_devices(smc, ini);
1535         if (rc)
1536                 goto fallback;
1537
1538         buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1539         if (!buf) {
1540                 rc = SMC_CLC_DECL_MEM;
1541                 goto fallback;
1542         }
1543         aclc = (struct smc_clc_msg_accept_confirm *)buf;
1544
1545         /* perform CLC handshake */
1546         rc = smc_connect_clc(smc, aclc, ini);
1547         if (rc) {
1548                 /* -EAGAIN on timeout, see tcp_recvmsg() */
1549                 if (rc == -EAGAIN) {
1550                         rc = -ETIMEDOUT;
1551                         smc->sk.sk_err = ETIMEDOUT;
1552                 }
1553                 goto vlan_cleanup;
1554         }
1555
1556         /* check if smc modes and versions of CLC proposal and accept match */
1557         rc = smc_connect_check_aclc(ini, aclc);
1558         version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1559         if (rc)
1560                 goto vlan_cleanup;
1561
1562         /* depending on previous steps, connect using rdma or ism */
1563         if (aclc->hdr.typev1 == SMC_TYPE_R) {
1564                 ini->smcr_version = version;
1565                 rc = smc_connect_rdma(smc, aclc, ini);
1566         } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1567                 ini->smcd_version = version;
1568                 rc = smc_connect_ism(smc, aclc, ini);
1569         }
1570         if (rc)
1571                 goto vlan_cleanup;
1572
1573         SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1574         smc_connect_ism_vlan_cleanup(smc, ini);
1575         kfree(buf);
1576         kfree(ini);
1577         return 0;
1578
1579 vlan_cleanup:
1580         smc_connect_ism_vlan_cleanup(smc, ini);
1581         kfree(buf);
1582 fallback:
1583         kfree(ini);
1584         return smc_connect_decline_fallback(smc, rc, version);
1585 }
1586
1587 static void smc_connect_work(struct work_struct *work)
1588 {
1589         struct smc_sock *smc = container_of(work, struct smc_sock,
1590                                             connect_work);
1591         long timeo = smc->sk.sk_sndtimeo;
1592         int rc = 0;
1593
1594         if (!timeo)
1595                 timeo = MAX_SCHEDULE_TIMEOUT;
1596         lock_sock(smc->clcsock->sk);
1597         if (smc->clcsock->sk->sk_err) {
1598                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1599         } else if ((1 << smc->clcsock->sk->sk_state) &
1600                                         (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1601                 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1602                 if ((rc == -EPIPE) &&
1603                     ((1 << smc->clcsock->sk->sk_state) &
1604                                         (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1605                         rc = 0;
1606         }
1607         release_sock(smc->clcsock->sk);
1608         lock_sock(&smc->sk);
1609         if (rc != 0 || smc->sk.sk_err) {
1610                 smc->sk.sk_state = SMC_CLOSED;
1611                 if (rc == -EPIPE || rc == -EAGAIN)
1612                         smc->sk.sk_err = EPIPE;
1613                 else if (rc == -ECONNREFUSED)
1614                         smc->sk.sk_err = ECONNREFUSED;
1615                 else if (signal_pending(current))
1616                         smc->sk.sk_err = -sock_intr_errno(timeo);
1617                 sock_put(&smc->sk); /* passive closing */
1618                 goto out;
1619         }
1620
1621         rc = __smc_connect(smc);
1622         if (rc < 0)
1623                 smc->sk.sk_err = -rc;
1624
1625 out:
1626         if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1627                 if (smc->sk.sk_err) {
1628                         smc->sk.sk_state_change(&smc->sk);
1629                 } else { /* allow polling before and after fallback decision */
1630                         smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1631                         smc->sk.sk_write_space(&smc->sk);
1632                 }
1633         }
1634         release_sock(&smc->sk);
1635 }
1636
1637 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1638                        int alen, int flags)
1639 {
1640         struct sock *sk = sock->sk;
1641         struct smc_sock *smc;
1642         int rc = -EINVAL;
1643
1644         smc = smc_sk(sk);
1645
1646         /* separate smc parameter checking to be safe */
1647         if (alen < sizeof(addr->sa_family))
1648                 goto out_err;
1649         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1650                 goto out_err;
1651
1652         lock_sock(sk);
1653         switch (sock->state) {
1654         default:
1655                 rc = -EINVAL;
1656                 goto out;
1657         case SS_CONNECTED:
1658                 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1659                 goto out;
1660         case SS_CONNECTING:
1661                 if (sk->sk_state == SMC_ACTIVE)
1662                         goto connected;
1663                 break;
1664         case SS_UNCONNECTED:
1665                 sock->state = SS_CONNECTING;
1666                 break;
1667         }
1668
1669         switch (sk->sk_state) {
1670         default:
1671                 goto out;
1672         case SMC_CLOSED:
1673                 rc = sock_error(sk) ? : -ECONNABORTED;
1674                 sock->state = SS_UNCONNECTED;
1675                 goto out;
1676         case SMC_ACTIVE:
1677                 rc = -EISCONN;
1678                 goto out;
1679         case SMC_INIT:
1680                 break;
1681         }
1682
1683         smc_copy_sock_settings_to_clc(smc);
1684         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1685         if (smc->connect_nonblock) {
1686                 rc = -EALREADY;
1687                 goto out;
1688         }
1689         rc = kernel_connect(smc->clcsock, addr, alen, flags);
1690         if (rc && rc != -EINPROGRESS)
1691                 goto out;
1692
1693         if (smc->use_fallback) {
1694                 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
1695                 goto out;
1696         }
1697         sock_hold(&smc->sk); /* sock put in passive closing */
1698         if (flags & O_NONBLOCK) {
1699                 if (queue_work(smc_hs_wq, &smc->connect_work))
1700                         smc->connect_nonblock = 1;
1701                 rc = -EINPROGRESS;
1702                 goto out;
1703         } else {
1704                 rc = __smc_connect(smc);
1705                 if (rc < 0)
1706                         goto out;
1707         }
1708
1709 connected:
1710         rc = 0;
1711         sock->state = SS_CONNECTED;
1712 out:
1713         release_sock(sk);
1714 out_err:
1715         return rc;
1716 }
1717
1718 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1719 {
1720         struct socket *new_clcsock = NULL;
1721         struct sock *lsk = &lsmc->sk;
1722         struct sock *new_sk;
1723         int rc = -EINVAL;
1724
1725         release_sock(lsk);
1726         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1727         if (!new_sk) {
1728                 rc = -ENOMEM;
1729                 lsk->sk_err = ENOMEM;
1730                 *new_smc = NULL;
1731                 lock_sock(lsk);
1732                 goto out;
1733         }
1734         *new_smc = smc_sk(new_sk);
1735
1736         mutex_lock(&lsmc->clcsock_release_lock);
1737         if (lsmc->clcsock)
1738                 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1739         mutex_unlock(&lsmc->clcsock_release_lock);
1740         lock_sock(lsk);
1741         if  (rc < 0 && rc != -EAGAIN)
1742                 lsk->sk_err = -rc;
1743         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1744                 new_sk->sk_prot->unhash(new_sk);
1745                 if (new_clcsock)
1746                         sock_release(new_clcsock);
1747                 new_sk->sk_state = SMC_CLOSED;
1748                 smc_sock_set_flag(new_sk, SOCK_DEAD);
1749                 sock_put(new_sk); /* final */
1750                 *new_smc = NULL;
1751                 goto out;
1752         }
1753
1754         /* new clcsock has inherited the smc listen-specific sk_data_ready
1755          * function; switch it back to the original sk_data_ready function
1756          */
1757         new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1758
1759         /* if new clcsock has also inherited the fallback-specific callback
1760          * functions, switch them back to the original ones.
1761          */
1762         if (lsmc->use_fallback) {
1763                 if (lsmc->clcsk_state_change)
1764                         new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1765                 if (lsmc->clcsk_write_space)
1766                         new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1767                 if (lsmc->clcsk_error_report)
1768                         new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1769         }
1770
1771         (*new_smc)->clcsock = new_clcsock;
1772 out:
1773         return rc;
1774 }
1775
1776 /* add a just created sock to the accept queue of the listen sock as
1777  * candidate for a following socket accept call from user space
1778  */
1779 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1780 {
1781         struct smc_sock *par = smc_sk(parent);
1782
1783         sock_hold(sk); /* sock_put in smc_accept_unlink () */
1784         spin_lock(&par->accept_q_lock);
1785         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1786         spin_unlock(&par->accept_q_lock);
1787         sk_acceptq_added(parent);
1788 }
1789
1790 /* remove a socket from the accept queue of its parental listening socket */
1791 static void smc_accept_unlink(struct sock *sk)
1792 {
1793         struct smc_sock *par = smc_sk(sk)->listen_smc;
1794
1795         spin_lock(&par->accept_q_lock);
1796         list_del_init(&smc_sk(sk)->accept_q);
1797         spin_unlock(&par->accept_q_lock);
1798         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1799         sock_put(sk); /* sock_hold in smc_accept_enqueue */
1800 }
1801
1802 /* remove a sock from the accept queue to bind it to a new socket created
1803  * for a socket accept call from user space
1804  */
1805 struct sock *smc_accept_dequeue(struct sock *parent,
1806                                 struct socket *new_sock)
1807 {
1808         struct smc_sock *isk, *n;
1809         struct sock *new_sk;
1810
1811         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1812                 new_sk = (struct sock *)isk;
1813
1814                 smc_accept_unlink(new_sk);
1815                 if (new_sk->sk_state == SMC_CLOSED) {
1816                         new_sk->sk_prot->unhash(new_sk);
1817                         if (isk->clcsock) {
1818                                 sock_release(isk->clcsock);
1819                                 isk->clcsock = NULL;
1820                         }
1821                         sock_put(new_sk); /* final */
1822                         continue;
1823                 }
1824                 if (new_sock) {
1825                         sock_graft(new_sk, new_sock);
1826                         new_sock->state = SS_CONNECTED;
1827                         if (isk->use_fallback) {
1828                                 smc_sk(new_sk)->clcsock->file = new_sock->file;
1829                                 isk->clcsock->file->private_data = isk->clcsock;
1830                         }
1831                 }
1832                 return new_sk;
1833         }
1834         return NULL;
1835 }
1836
1837 /* clean up for a created but never accepted sock */
1838 void smc_close_non_accepted(struct sock *sk)
1839 {
1840         struct smc_sock *smc = smc_sk(sk);
1841
1842         sock_hold(sk); /* sock_put below */
1843         lock_sock(sk);
1844         if (!sk->sk_lingertime)
1845                 /* wait for peer closing */
1846                 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);
1847         __smc_release(smc);
1848         release_sock(sk);
1849         sock_put(sk); /* sock_hold above */
1850         sock_put(sk); /* final sock_put */
1851 }
1852
1853 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1854 {
1855         struct smc_link *link = smc->conn.lnk;
1856         struct smc_llc_qentry *qentry;
1857         int rc;
1858
1859         /* reg the sndbuf if it was vzalloced*/
1860         if (smc->conn.sndbuf_desc->is_vm) {
1861                 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
1862                         return SMC_CLC_DECL_ERR_REGBUF;
1863         }
1864
1865         /* reg the rmb */
1866         if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
1867                 return SMC_CLC_DECL_ERR_REGBUF;
1868
1869         /* send CONFIRM LINK request to client over the RoCE fabric */
1870         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1871         if (rc < 0)
1872                 return SMC_CLC_DECL_TIMEOUT_CL;
1873
1874         /* receive CONFIRM LINK response from client over the RoCE fabric */
1875         qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1876                               SMC_LLC_CONFIRM_LINK);
1877         if (!qentry) {
1878                 struct smc_clc_msg_decline dclc;
1879
1880                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1881                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1882                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1883         }
1884         smc_llc_save_peer_uid(qentry);
1885         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1886         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1887         if (rc)
1888                 return SMC_CLC_DECL_RMBE_EC;
1889
1890         /* confirm_rkey is implicit on 1st contact */
1891         smc->conn.rmb_desc->is_conf_rkey = true;
1892
1893         smc_llc_link_active(link);
1894         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1895
1896         if (link->lgr->max_links > 1) {
1897                 down_write(&link->lgr->llc_conf_mutex);
1898                 /* initial contact - try to establish second link */
1899                 smc_llc_srv_add_link(link, NULL);
1900                 up_write(&link->lgr->llc_conf_mutex);
1901         }
1902         return 0;
1903 }
1904
1905 /* listen worker: finish */
1906 static void smc_listen_out(struct smc_sock *new_smc)
1907 {
1908         struct smc_sock *lsmc = new_smc->listen_smc;
1909         struct sock *newsmcsk = &new_smc->sk;
1910
1911         if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1912                 atomic_dec(&lsmc->queued_smc_hs);
1913
1914         if (lsmc->sk.sk_state == SMC_LISTEN) {
1915                 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1916                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1917                 release_sock(&lsmc->sk);
1918         } else { /* no longer listening */
1919                 smc_close_non_accepted(newsmcsk);
1920         }
1921
1922         /* Wake up accept */
1923         lsmc->sk.sk_data_ready(&lsmc->sk);
1924         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1925 }
1926
1927 /* listen worker: finish in state connected */
1928 static void smc_listen_out_connected(struct smc_sock *new_smc)
1929 {
1930         struct sock *newsmcsk = &new_smc->sk;
1931
1932         if (newsmcsk->sk_state == SMC_INIT)
1933                 newsmcsk->sk_state = SMC_ACTIVE;
1934
1935         smc_listen_out(new_smc);
1936 }
1937
1938 /* listen worker: finish in error state */
1939 static void smc_listen_out_err(struct smc_sock *new_smc)
1940 {
1941         struct sock *newsmcsk = &new_smc->sk;
1942         struct net *net = sock_net(newsmcsk);
1943
1944         this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1945         if (newsmcsk->sk_state == SMC_INIT)
1946                 sock_put(&new_smc->sk); /* passive closing */
1947         newsmcsk->sk_state = SMC_CLOSED;
1948
1949         smc_listen_out(new_smc);
1950 }
1951
1952 /* listen worker: decline and fall back if possible */
1953 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1954                                int local_first, u8 version)
1955 {
1956         /* RDMA setup failed, switch back to TCP */
1957         smc_conn_abort(new_smc, local_first);
1958         if (reason_code < 0 ||
1959             smc_switch_to_fallback(new_smc, reason_code)) {
1960                 /* error, no fallback possible */
1961                 smc_listen_out_err(new_smc);
1962                 return;
1963         }
1964         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1965                 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1966                         smc_listen_out_err(new_smc);
1967                         return;
1968                 }
1969         }
1970         smc_listen_out_connected(new_smc);
1971 }
1972
1973 /* listen worker: version checking */
1974 static int smc_listen_v2_check(struct smc_sock *new_smc,
1975                                struct smc_clc_msg_proposal *pclc,
1976                                struct smc_init_info *ini)
1977 {
1978         struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1979         struct smc_clc_v2_extension *pclc_v2_ext;
1980         int rc = SMC_CLC_DECL_PEERNOSMC;
1981
1982         ini->smc_type_v1 = pclc->hdr.typev1;
1983         ini->smc_type_v2 = pclc->hdr.typev2;
1984         ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1985         ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1986         if (pclc->hdr.version > SMC_V1) {
1987                 if (smcd_indicated(ini->smc_type_v2))
1988                         ini->smcd_version |= SMC_V2;
1989                 if (smcr_indicated(ini->smc_type_v2))
1990                         ini->smcr_version |= SMC_V2;
1991         }
1992         if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1993                 rc = SMC_CLC_DECL_PEERNOSMC;
1994                 goto out;
1995         }
1996         pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1997         if (!pclc_v2_ext) {
1998                 ini->smcd_version &= ~SMC_V2;
1999                 ini->smcr_version &= ~SMC_V2;
2000                 rc = SMC_CLC_DECL_NOV2EXT;
2001                 goto out;
2002         }
2003         pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
2004         if (ini->smcd_version & SMC_V2) {
2005                 if (!smc_ism_is_v2_capable()) {
2006                         ini->smcd_version &= ~SMC_V2;
2007                         rc = SMC_CLC_DECL_NOISM2SUPP;
2008                 } else if (!pclc_smcd_v2_ext) {
2009                         ini->smcd_version &= ~SMC_V2;
2010                         rc = SMC_CLC_DECL_NOV2DEXT;
2011                 } else if (!pclc_v2_ext->hdr.eid_cnt &&
2012                            !pclc_v2_ext->hdr.flag.seid) {
2013                         ini->smcd_version &= ~SMC_V2;
2014                         rc = SMC_CLC_DECL_NOUEID;
2015                 }
2016         }
2017         if (ini->smcr_version & SMC_V2) {
2018                 if (!pclc_v2_ext->hdr.eid_cnt) {
2019                         ini->smcr_version &= ~SMC_V2;
2020                         rc = SMC_CLC_DECL_NOUEID;
2021                 }
2022         }
2023
2024         ini->release_nr = pclc_v2_ext->hdr.flag.release;
2025         if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
2026                 ini->release_nr = SMC_RELEASE;
2027
2028 out:
2029         if (!ini->smcd_version && !ini->smcr_version)
2030                 return rc;
2031
2032         return 0;
2033 }
2034
2035 /* listen worker: check prefixes */
2036 static int smc_listen_prfx_check(struct smc_sock *new_smc,
2037                                  struct smc_clc_msg_proposal *pclc)
2038 {
2039         struct smc_clc_msg_proposal_prefix *pclc_prfx;
2040         struct socket *newclcsock = new_smc->clcsock;
2041
2042         if (pclc->hdr.typev1 == SMC_TYPE_N)
2043                 return 0;
2044         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
2045         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
2046                 return SMC_CLC_DECL_DIFFPREFIX;
2047
2048         return 0;
2049 }
2050
2051 /* listen worker: initialize connection and buffers */
2052 static int smc_listen_rdma_init(struct smc_sock *new_smc,
2053                                 struct smc_init_info *ini)
2054 {
2055         int rc;
2056
2057         /* allocate connection / link group */
2058         rc = smc_conn_create(new_smc, ini);
2059         if (rc)
2060                 return rc;
2061
2062         /* create send buffer and rmb */
2063         if (smc_buf_create(new_smc, false)) {
2064                 smc_conn_abort(new_smc, ini->first_contact_local);
2065                 return SMC_CLC_DECL_MEM;
2066         }
2067
2068         return 0;
2069 }
2070
2071 /* listen worker: initialize connection and buffers for SMC-D */
2072 static int smc_listen_ism_init(struct smc_sock *new_smc,
2073                                struct smc_init_info *ini)
2074 {
2075         int rc;
2076
2077         rc = smc_conn_create(new_smc, ini);
2078         if (rc)
2079                 return rc;
2080
2081         /* Create send and receive buffers */
2082         rc = smc_buf_create(new_smc, true);
2083         if (rc) {
2084                 smc_conn_abort(new_smc, ini->first_contact_local);
2085                 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
2086                                          SMC_CLC_DECL_MEM;
2087         }
2088
2089         return 0;
2090 }
2091
2092 static bool smc_is_already_selected(struct smcd_dev *smcd,
2093                                     struct smc_init_info *ini,
2094                                     int matches)
2095 {
2096         int i;
2097
2098         for (i = 0; i < matches; i++)
2099                 if (smcd == ini->ism_dev[i])
2100                         return true;
2101
2102         return false;
2103 }
2104
2105 /* check for ISM devices matching proposed ISM devices */
2106 static void smc_check_ism_v2_match(struct smc_init_info *ini,
2107                                    u16 proposed_chid,
2108                                    struct smcd_gid *proposed_gid,
2109                                    unsigned int *matches)
2110 {
2111         struct smcd_dev *smcd;
2112
2113         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2114                 if (smcd->going_away)
2115                         continue;
2116                 if (smc_is_already_selected(smcd, ini, *matches))
2117                         continue;
2118                 if (smc_ism_get_chid(smcd) == proposed_chid &&
2119                     !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
2120                         ini->ism_peer_gid[*matches].gid = proposed_gid->gid;
2121                         if (__smc_ism_is_emulated(proposed_chid))
2122                                 ini->ism_peer_gid[*matches].gid_ext =
2123                                                         proposed_gid->gid_ext;
2124                                 /* non-Emulated-ISM's peer gid_ext remains 0. */
2125                         ini->ism_dev[*matches] = smcd;
2126                         (*matches)++;
2127                         break;
2128                 }
2129         }
2130 }
2131
2132 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2133 {
2134         if (!ini->rc)
2135                 ini->rc = rc;
2136 }
2137
2138 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2139                                         struct smc_clc_msg_proposal *pclc,
2140                                         struct smc_init_info *ini)
2141 {
2142         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2143         struct smc_clc_v2_extension *smc_v2_ext;
2144         struct smc_clc_msg_smcd *pclc_smcd;
2145         unsigned int matches = 0;
2146         struct smcd_gid smcd_gid;
2147         u8 smcd_version;
2148         u8 *eid = NULL;
2149         int i, rc;
2150         u16 chid;
2151
2152         if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
2153                 goto not_found;
2154
2155         pclc_smcd = smc_get_clc_msg_smcd(pclc);
2156         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2157         smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
2158
2159         mutex_lock(&smcd_dev_list.mutex);
2160         if (pclc_smcd->ism.chid) {
2161                 /* check for ISM device matching proposed native ISM device */
2162                 smcd_gid.gid = ntohll(pclc_smcd->ism.gid);
2163                 smcd_gid.gid_ext = 0;
2164                 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2165                                        &smcd_gid, &matches);
2166         }
2167         for (i = 0; i < smc_v2_ext->hdr.ism_gid_cnt; i++) {
2168                 /* check for ISM devices matching proposed non-native ISM
2169                  * devices
2170                  */
2171                 smcd_gid.gid = ntohll(smcd_v2_ext->gidchid[i].gid);
2172                 smcd_gid.gid_ext = 0;
2173                 chid = ntohs(smcd_v2_ext->gidchid[i].chid);
2174                 if (__smc_ism_is_emulated(chid)) {
2175                         if ((i + 1) == smc_v2_ext->hdr.ism_gid_cnt ||
2176                             chid != ntohs(smcd_v2_ext->gidchid[i + 1].chid))
2177                                 /* each Emulated-ISM device takes two GID-CHID
2178                                  * entries and CHID of the second entry repeats
2179                                  * that of the first entry.
2180                                  *
2181                                  * So check if the next GID-CHID entry exists
2182                                  * and both two entries' CHIDs are the same.
2183                                  */
2184                                 continue;
2185                         smcd_gid.gid_ext =
2186                                 ntohll(smcd_v2_ext->gidchid[++i].gid);
2187                 }
2188                 smc_check_ism_v2_match(ini, chid, &smcd_gid, &matches);
2189         }
2190         mutex_unlock(&smcd_dev_list.mutex);
2191
2192         if (!ini->ism_dev[0]) {
2193                 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
2194                 goto not_found;
2195         }
2196
2197         smc_ism_get_system_eid(&eid);
2198         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2199                                smcd_v2_ext->system_eid, eid))
2200                 goto not_found;
2201
2202         /* separate - outside the smcd_dev_list.lock */
2203         smcd_version = ini->smcd_version;
2204         for (i = 0; i < matches; i++) {
2205                 ini->smcd_version = SMC_V2;
2206                 ini->is_smcd = true;
2207                 ini->ism_selected = i;
2208                 rc = smc_listen_ism_init(new_smc, ini);
2209                 if (rc) {
2210                         smc_find_ism_store_rc(rc, ini);
2211                         /* try next active ISM device */
2212                         continue;
2213                 }
2214                 return; /* matching and usable V2 ISM device found */
2215         }
2216         /* no V2 ISM device could be initialized */
2217         ini->smcd_version = smcd_version;       /* restore original value */
2218         ini->negotiated_eid[0] = 0;
2219
2220 not_found:
2221         ini->smcd_version &= ~SMC_V2;
2222         ini->ism_dev[0] = NULL;
2223         ini->is_smcd = false;
2224 }
2225
2226 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2227                                         struct smc_clc_msg_proposal *pclc,
2228                                         struct smc_init_info *ini)
2229 {
2230         struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
2231         int rc = 0;
2232
2233         /* check if ISM V1 is available */
2234         if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
2235                 goto not_found;
2236         ini->is_smcd = true; /* prepare ISM check */
2237         ini->ism_peer_gid[0].gid = ntohll(pclc_smcd->ism.gid);
2238         ini->ism_peer_gid[0].gid_ext = 0;
2239         rc = smc_find_ism_device(new_smc, ini);
2240         if (rc)
2241                 goto not_found;
2242         ini->ism_selected = 0;
2243         rc = smc_listen_ism_init(new_smc, ini);
2244         if (!rc)
2245                 return;         /* V1 ISM device found */
2246
2247 not_found:
2248         smc_find_ism_store_rc(rc, ini);
2249         ini->smcd_version &= ~SMC_V1;
2250         ini->ism_dev[0] = NULL;
2251         ini->is_smcd = false;
2252 }
2253
2254 /* listen worker: register buffers */
2255 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
2256 {
2257         struct smc_connection *conn = &new_smc->conn;
2258
2259         if (!local_first) {
2260                 /* reg sendbufs if they were vzalloced */
2261                 if (conn->sndbuf_desc->is_vm) {
2262                         if (smcr_lgr_reg_sndbufs(conn->lnk,
2263                                                  conn->sndbuf_desc))
2264                                 return SMC_CLC_DECL_ERR_REGBUF;
2265                 }
2266                 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
2267                         return SMC_CLC_DECL_ERR_REGBUF;
2268         }
2269
2270         return 0;
2271 }
2272
2273 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2274                                          struct smc_clc_msg_proposal *pclc,
2275                                          struct smc_init_info *ini)
2276 {
2277         struct smc_clc_v2_extension *smc_v2_ext;
2278         u8 smcr_version;
2279         int rc;
2280
2281         if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2282                 goto not_found;
2283
2284         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2285         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2286                 goto not_found;
2287
2288         /* prepare RDMA check */
2289         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2290         memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2291         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2292         ini->check_smcrv2 = true;
2293         ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2294         ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2295         ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2296         rc = smc_find_rdma_device(new_smc, ini);
2297         if (rc) {
2298                 smc_find_ism_store_rc(rc, ini);
2299                 goto not_found;
2300         }
2301         if (!ini->smcrv2.uses_gateway)
2302                 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2303
2304         smcr_version = ini->smcr_version;
2305         ini->smcr_version = SMC_V2;
2306         rc = smc_listen_rdma_init(new_smc, ini);
2307         if (!rc) {
2308                 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2309                 if (rc)
2310                         smc_conn_abort(new_smc, ini->first_contact_local);
2311         }
2312         if (!rc)
2313                 return;
2314         ini->smcr_version = smcr_version;
2315         smc_find_ism_store_rc(rc, ini);
2316
2317 not_found:
2318         ini->smcr_version &= ~SMC_V2;
2319         ini->smcrv2.ib_dev_v2 = NULL;
2320         ini->check_smcrv2 = false;
2321 }
2322
2323 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2324                                         struct smc_clc_msg_proposal *pclc,
2325                                         struct smc_init_info *ini)
2326 {
2327         int rc;
2328
2329         if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
2330                 return SMC_CLC_DECL_NOSMCDEV;
2331
2332         /* prepare RDMA check */
2333         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2334         memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2335         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2336         rc = smc_find_rdma_device(new_smc, ini);
2337         if (rc) {
2338                 /* no RDMA device found */
2339                 return SMC_CLC_DECL_NOSMCDEV;
2340         }
2341         rc = smc_listen_rdma_init(new_smc, ini);
2342         if (rc)
2343                 return rc;
2344         return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2345 }
2346
2347 /* determine the local device matching to proposal */
2348 static int smc_listen_find_device(struct smc_sock *new_smc,
2349                                   struct smc_clc_msg_proposal *pclc,
2350                                   struct smc_init_info *ini)
2351 {
2352         int prfx_rc;
2353
2354         /* check for ISM device matching V2 proposed device */
2355         smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2356         if (ini->ism_dev[0])
2357                 return 0;
2358
2359         /* check for matching IP prefix and subnet length (V1) */
2360         prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2361         if (prfx_rc)
2362                 smc_find_ism_store_rc(prfx_rc, ini);
2363
2364         /* get vlan id from IP device */
2365         if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
2366                 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
2367
2368         /* check for ISM device matching V1 proposed device */
2369         if (!prfx_rc)
2370                 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
2371         if (ini->ism_dev[0])
2372                 return 0;
2373
2374         if (!smcr_indicated(pclc->hdr.typev1) &&
2375             !smcr_indicated(pclc->hdr.typev2))
2376                 /* skip RDMA and decline */
2377                 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
2378
2379         /* check if RDMA V2 is available */
2380         smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2381         if (ini->smcrv2.ib_dev_v2)
2382                 return 0;
2383
2384         /* check if RDMA V1 is available */
2385         if (!prfx_rc) {
2386                 int rc;
2387
2388                 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2389                 smc_find_ism_store_rc(rc, ini);
2390                 return (!rc) ? 0 : ini->rc;
2391         }
2392         return prfx_rc;
2393 }
2394
2395 /* listen worker: finish RDMA setup */
2396 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2397                                   struct smc_clc_msg_accept_confirm *cclc,
2398                                   bool local_first,
2399                                   struct smc_init_info *ini)
2400 {
2401         struct smc_link *link = new_smc->conn.lnk;
2402         int reason_code = 0;
2403
2404         if (local_first)
2405                 smc_link_save_peer_info(link, cclc, ini);
2406
2407         if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2408                 return SMC_CLC_DECL_ERR_RTOK;
2409
2410         if (local_first) {
2411                 if (smc_ib_ready_link(link))
2412                         return SMC_CLC_DECL_ERR_RDYLNK;
2413                 /* QP confirmation over RoCE fabric */
2414                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
2415                 reason_code = smcr_serv_conf_first_link(new_smc);
2416                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
2417         }
2418         return reason_code;
2419 }
2420
2421 /* setup for connection of server */
2422 static void smc_listen_work(struct work_struct *work)
2423 {
2424         struct smc_sock *new_smc = container_of(work, struct smc_sock,
2425                                                 smc_listen_work);
2426         struct socket *newclcsock = new_smc->clcsock;
2427         struct smc_clc_msg_accept_confirm *cclc;
2428         struct smc_clc_msg_proposal_area *buf;
2429         struct smc_clc_msg_proposal *pclc;
2430         struct smc_init_info *ini = NULL;
2431         u8 proposal_version = SMC_V1;
2432         u8 accept_version;
2433         int rc = 0;
2434
2435         if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2436                 return smc_listen_out_err(new_smc);
2437
2438         if (new_smc->use_fallback) {
2439                 smc_listen_out_connected(new_smc);
2440                 return;
2441         }
2442
2443         /* check if peer is smc capable */
2444         if (!tcp_sk(newclcsock->sk)->syn_smc) {
2445                 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2446                 if (rc)
2447                         smc_listen_out_err(new_smc);
2448                 else
2449                         smc_listen_out_connected(new_smc);
2450                 return;
2451         }
2452
2453         /* do inband token exchange -
2454          * wait for and receive SMC Proposal CLC message
2455          */
2456         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2457         if (!buf) {
2458                 rc = SMC_CLC_DECL_MEM;
2459                 goto out_decl;
2460         }
2461         pclc = (struct smc_clc_msg_proposal *)buf;
2462         rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
2463                               SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
2464         if (rc)
2465                 goto out_decl;
2466
2467         if (pclc->hdr.version > SMC_V1)
2468                 proposal_version = SMC_V2;
2469
2470         /* IPSec connections opt out of SMC optimizations */
2471         if (using_ipsec(new_smc)) {
2472                 rc = SMC_CLC_DECL_IPSEC;
2473                 goto out_decl;
2474         }
2475
2476         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2477         if (!ini) {
2478                 rc = SMC_CLC_DECL_MEM;
2479                 goto out_decl;
2480         }
2481
2482         /* initial version checking */
2483         rc = smc_listen_v2_check(new_smc, pclc, ini);
2484         if (rc)
2485                 goto out_decl;
2486
2487         rc = smc_clc_srv_v2x_features_validate(new_smc, pclc, ini);
2488         if (rc)
2489                 goto out_decl;
2490
2491         mutex_lock(&smc_server_lgr_pending);
2492         smc_close_init(new_smc);
2493         smc_rx_init(new_smc);
2494         smc_tx_init(new_smc);
2495
2496         /* determine ISM or RoCE device used for connection */
2497         rc = smc_listen_find_device(new_smc, pclc, ini);
2498         if (rc)
2499                 goto out_unlock;
2500
2501         /* send SMC Accept CLC message */
2502         accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
2503         rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
2504                                  accept_version, ini->negotiated_eid, ini);
2505         if (rc)
2506                 goto out_unlock;
2507
2508         /* SMC-D does not need this lock any more */
2509         if (ini->is_smcd)
2510                 mutex_unlock(&smc_server_lgr_pending);
2511
2512         /* receive SMC Confirm CLC message */
2513         memset(buf, 0, sizeof(*buf));
2514         cclc = (struct smc_clc_msg_accept_confirm *)buf;
2515         rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
2516                               SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2517         if (rc) {
2518                 if (!ini->is_smcd)
2519                         goto out_unlock;
2520                 goto out_decl;
2521         }
2522
2523         rc = smc_clc_v2x_features_confirm_check(cclc, ini);
2524         if (rc) {
2525                 if (!ini->is_smcd)
2526                         goto out_unlock;
2527                 goto out_decl;
2528         }
2529
2530         /* fce smc release version is needed in smc_listen_rdma_finish,
2531          * so save fce info here.
2532          */
2533         smc_conn_save_peer_info_fce(new_smc, cclc);
2534
2535         /* finish worker */
2536         if (!ini->is_smcd) {
2537                 rc = smc_listen_rdma_finish(new_smc, cclc,
2538                                             ini->first_contact_local, ini);
2539                 if (rc)
2540                         goto out_unlock;
2541                 mutex_unlock(&smc_server_lgr_pending);
2542         }
2543         smc_conn_save_peer_info(new_smc, cclc);
2544         smc_listen_out_connected(new_smc);
2545         SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
2546         goto out_free;
2547
2548 out_unlock:
2549         mutex_unlock(&smc_server_lgr_pending);
2550 out_decl:
2551         smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
2552                            proposal_version);
2553 out_free:
2554         kfree(ini);
2555         kfree(buf);
2556 }
2557
2558 static void smc_tcp_listen_work(struct work_struct *work)
2559 {
2560         struct smc_sock *lsmc = container_of(work, struct smc_sock,
2561                                              tcp_listen_work);
2562         struct sock *lsk = &lsmc->sk;
2563         struct smc_sock *new_smc;
2564         int rc = 0;
2565
2566         lock_sock(lsk);
2567         while (lsk->sk_state == SMC_LISTEN) {
2568                 rc = smc_clcsock_accept(lsmc, &new_smc);
2569                 if (rc) /* clcsock accept queue empty or error */
2570                         goto out;
2571                 if (!new_smc)
2572                         continue;
2573
2574                 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2575                         atomic_inc(&lsmc->queued_smc_hs);
2576
2577                 new_smc->listen_smc = lsmc;
2578                 new_smc->use_fallback = lsmc->use_fallback;
2579                 new_smc->fallback_rsn = lsmc->fallback_rsn;
2580                 sock_hold(lsk); /* sock_put in smc_listen_work */
2581                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2582                 smc_copy_sock_settings_to_smc(new_smc);
2583                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
2584                 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
2585                         sock_put(&new_smc->sk);
2586         }
2587
2588 out:
2589         release_sock(lsk);
2590         sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2591 }
2592
2593 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2594 {
2595         struct smc_sock *lsmc;
2596
2597         read_lock_bh(&listen_clcsock->sk_callback_lock);
2598         lsmc = smc_clcsock_user_data(listen_clcsock);
2599         if (!lsmc)
2600                 goto out;
2601         lsmc->clcsk_data_ready(listen_clcsock);
2602         if (lsmc->sk.sk_state == SMC_LISTEN) {
2603                 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
2604                 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
2605                         sock_put(&lsmc->sk);
2606         }
2607 out:
2608         read_unlock_bh(&listen_clcsock->sk_callback_lock);
2609 }
2610
2611 static int smc_listen(struct socket *sock, int backlog)
2612 {
2613         struct sock *sk = sock->sk;
2614         struct smc_sock *smc;
2615         int rc;
2616
2617         smc = smc_sk(sk);
2618         lock_sock(sk);
2619
2620         rc = -EINVAL;
2621         if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2622             smc->connect_nonblock || sock->state != SS_UNCONNECTED)
2623                 goto out;
2624
2625         rc = 0;
2626         if (sk->sk_state == SMC_LISTEN) {
2627                 sk->sk_max_ack_backlog = backlog;
2628                 goto out;
2629         }
2630         /* some socket options are handled in core, so we could not apply
2631          * them to the clc socket -- copy smc socket options to clc socket
2632          */
2633         smc_copy_sock_settings_to_clc(smc);
2634         if (!smc->use_fallback)
2635                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
2636
2637         /* save original sk_data_ready function and establish
2638          * smc-specific sk_data_ready function
2639          */
2640         write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2641         smc->clcsock->sk->sk_user_data =
2642                 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
2643         smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2644                                smc_clcsock_data_ready, &smc->clcsk_data_ready);
2645         write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2646
2647         /* save original ops */
2648         smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2649
2650         smc->af_ops = *smc->ori_af_ops;
2651         smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2652
2653         inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2654
2655         if (smc->limit_smc_hs)
2656                 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
2657
2658         rc = kernel_listen(smc->clcsock, backlog);
2659         if (rc) {
2660                 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2661                 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2662                                        &smc->clcsk_data_ready);
2663                 smc->clcsock->sk->sk_user_data = NULL;
2664                 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2665                 goto out;
2666         }
2667         sk->sk_max_ack_backlog = backlog;
2668         sk->sk_ack_backlog = 0;
2669         sk->sk_state = SMC_LISTEN;
2670
2671 out:
2672         release_sock(sk);
2673         return rc;
2674 }
2675
2676 static int smc_accept(struct socket *sock, struct socket *new_sock,
2677                       int flags, bool kern)
2678 {
2679         struct sock *sk = sock->sk, *nsk;
2680         DECLARE_WAITQUEUE(wait, current);
2681         struct smc_sock *lsmc;
2682         long timeo;
2683         int rc = 0;
2684
2685         lsmc = smc_sk(sk);
2686         sock_hold(sk); /* sock_put below */
2687         lock_sock(sk);
2688
2689         if (lsmc->sk.sk_state != SMC_LISTEN) {
2690                 rc = -EINVAL;
2691                 release_sock(sk);
2692                 goto out;
2693         }
2694
2695         /* Wait for an incoming connection */
2696         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2697         add_wait_queue_exclusive(sk_sleep(sk), &wait);
2698         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2699                 set_current_state(TASK_INTERRUPTIBLE);
2700                 if (!timeo) {
2701                         rc = -EAGAIN;
2702                         break;
2703                 }
2704                 release_sock(sk);
2705                 timeo = schedule_timeout(timeo);
2706                 /* wakeup by sk_data_ready in smc_listen_work() */
2707                 sched_annotate_sleep();
2708                 lock_sock(sk);
2709                 if (signal_pending(current)) {
2710                         rc = sock_intr_errno(timeo);
2711                         break;
2712                 }
2713         }
2714         set_current_state(TASK_RUNNING);
2715         remove_wait_queue(sk_sleep(sk), &wait);
2716
2717         if (!rc)
2718                 rc = sock_error(nsk);
2719         release_sock(sk);
2720         if (rc)
2721                 goto out;
2722
2723         if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2724                 /* wait till data arrives on the socket */
2725                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2726                                                                 MSEC_PER_SEC);
2727                 if (smc_sk(nsk)->use_fallback) {
2728                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2729
2730                         lock_sock(clcsk);
2731                         if (skb_queue_empty(&clcsk->sk_receive_queue))
2732                                 sk_wait_data(clcsk, &timeo, NULL);
2733                         release_sock(clcsk);
2734                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2735                         lock_sock(nsk);
2736                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
2737                         release_sock(nsk);
2738                 }
2739         }
2740
2741 out:
2742         sock_put(sk); /* sock_hold above */
2743         return rc;
2744 }
2745
2746 static int smc_getname(struct socket *sock, struct sockaddr *addr,
2747                        int peer)
2748 {
2749         struct smc_sock *smc;
2750
2751         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2752             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2753                 return -ENOTCONN;
2754
2755         smc = smc_sk(sock->sk);
2756
2757         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2758 }
2759
2760 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2761 {
2762         struct sock *sk = sock->sk;
2763         struct smc_sock *smc;
2764         int rc;
2765
2766         smc = smc_sk(sk);
2767         lock_sock(sk);
2768
2769         /* SMC does not support connect with fastopen */
2770         if (msg->msg_flags & MSG_FASTOPEN) {
2771                 /* not connected yet, fallback */
2772                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2773                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2774                         if (rc)
2775                                 goto out;
2776                 } else {
2777                         rc = -EINVAL;
2778                         goto out;
2779                 }
2780         } else if ((sk->sk_state != SMC_ACTIVE) &&
2781                    (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2782                    (sk->sk_state != SMC_INIT)) {
2783                 rc = -EPIPE;
2784                 goto out;
2785         }
2786
2787         if (smc->use_fallback) {
2788                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2789         } else {
2790                 rc = smc_tx_sendmsg(smc, msg, len);
2791                 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2792         }
2793 out:
2794         release_sock(sk);
2795         return rc;
2796 }
2797
2798 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2799                        int flags)
2800 {
2801         struct sock *sk = sock->sk;
2802         struct smc_sock *smc;
2803         int rc = -ENOTCONN;
2804
2805         smc = smc_sk(sk);
2806         lock_sock(sk);
2807         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2808                 /* socket was connected before, no more data to read */
2809                 rc = 0;
2810                 goto out;
2811         }
2812         if ((sk->sk_state == SMC_INIT) ||
2813             (sk->sk_state == SMC_LISTEN) ||
2814             (sk->sk_state == SMC_CLOSED))
2815                 goto out;
2816
2817         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2818                 rc = 0;
2819                 goto out;
2820         }
2821
2822         if (smc->use_fallback) {
2823                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2824         } else {
2825                 msg->msg_namelen = 0;
2826                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2827                 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2828         }
2829
2830 out:
2831         release_sock(sk);
2832         return rc;
2833 }
2834
2835 static __poll_t smc_accept_poll(struct sock *parent)
2836 {
2837         struct smc_sock *isk = smc_sk(parent);
2838         __poll_t mask = 0;
2839
2840         spin_lock(&isk->accept_q_lock);
2841         if (!list_empty(&isk->accept_q))
2842                 mask = EPOLLIN | EPOLLRDNORM;
2843         spin_unlock(&isk->accept_q_lock);
2844
2845         return mask;
2846 }
2847
2848 static __poll_t smc_poll(struct file *file, struct socket *sock,
2849                              poll_table *wait)
2850 {
2851         struct sock *sk = sock->sk;
2852         struct smc_sock *smc;
2853         __poll_t mask = 0;
2854
2855         if (!sk)
2856                 return EPOLLNVAL;
2857
2858         smc = smc_sk(sock->sk);
2859         if (smc->use_fallback) {
2860                 /* delegate to CLC child sock */
2861                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2862                 sk->sk_err = smc->clcsock->sk->sk_err;
2863         } else {
2864                 if (sk->sk_state != SMC_CLOSED)
2865                         sock_poll_wait(file, sock, wait);
2866                 if (sk->sk_err)
2867                         mask |= EPOLLERR;
2868                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2869                     (sk->sk_state == SMC_CLOSED))
2870                         mask |= EPOLLHUP;
2871                 if (sk->sk_state == SMC_LISTEN) {
2872                         /* woken up by sk_data_ready in smc_listen_work() */
2873                         mask |= smc_accept_poll(sk);
2874                 } else if (smc->use_fallback) { /* as result of connect_work()*/
2875                         mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2876                                                            wait);
2877                         sk->sk_err = smc->clcsock->sk->sk_err;
2878                 } else {
2879                         if ((sk->sk_state != SMC_INIT &&
2880                              atomic_read(&smc->conn.sndbuf_space)) ||
2881                             sk->sk_shutdown & SEND_SHUTDOWN) {
2882                                 mask |= EPOLLOUT | EPOLLWRNORM;
2883                         } else {
2884                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2885                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2886                         }
2887                         if (atomic_read(&smc->conn.bytes_to_rcv))
2888                                 mask |= EPOLLIN | EPOLLRDNORM;
2889                         if (sk->sk_shutdown & RCV_SHUTDOWN)
2890                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2891                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
2892                                 mask |= EPOLLIN;
2893                         if (smc->conn.urg_state == SMC_URG_VALID)
2894                                 mask |= EPOLLPRI;
2895                 }
2896         }
2897
2898         return mask;
2899 }
2900
2901 static int smc_shutdown(struct socket *sock, int how)
2902 {
2903         struct sock *sk = sock->sk;
2904         bool do_shutdown = true;
2905         struct smc_sock *smc;
2906         int rc = -EINVAL;
2907         int old_state;
2908         int rc1 = 0;
2909
2910         smc = smc_sk(sk);
2911
2912         if ((how < SHUT_RD) || (how > SHUT_RDWR))
2913                 return rc;
2914
2915         lock_sock(sk);
2916
2917         if (sock->state == SS_CONNECTING) {
2918                 if (sk->sk_state == SMC_ACTIVE)
2919                         sock->state = SS_CONNECTED;
2920                 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2921                          sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2922                          sk->sk_state == SMC_APPCLOSEWAIT1 ||
2923                          sk->sk_state == SMC_APPCLOSEWAIT2 ||
2924                          sk->sk_state == SMC_APPFINCLOSEWAIT)
2925                         sock->state = SS_DISCONNECTING;
2926         }
2927
2928         rc = -ENOTCONN;
2929         if ((sk->sk_state != SMC_ACTIVE) &&
2930             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2931             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2932             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2933             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2934             (sk->sk_state != SMC_APPFINCLOSEWAIT))
2935                 goto out;
2936         if (smc->use_fallback) {
2937                 rc = kernel_sock_shutdown(smc->clcsock, how);
2938                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2939                 if (sk->sk_shutdown == SHUTDOWN_MASK) {
2940                         sk->sk_state = SMC_CLOSED;
2941                         sk->sk_socket->state = SS_UNCONNECTED;
2942                         sock_put(sk);
2943                 }
2944                 goto out;
2945         }
2946         switch (how) {
2947         case SHUT_RDWR:         /* shutdown in both directions */
2948                 old_state = sk->sk_state;
2949                 rc = smc_close_active(smc);
2950                 if (old_state == SMC_ACTIVE &&
2951                     sk->sk_state == SMC_PEERCLOSEWAIT1)
2952                         do_shutdown = false;
2953                 break;
2954         case SHUT_WR:
2955                 rc = smc_close_shutdown_write(smc);
2956                 break;
2957         case SHUT_RD:
2958                 rc = 0;
2959                 /* nothing more to do because peer is not involved */
2960                 break;
2961         }
2962         if (do_shutdown && smc->clcsock)
2963                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2964         /* map sock_shutdown_cmd constants to sk_shutdown value range */
2965         sk->sk_shutdown |= how + 1;
2966
2967         if (sk->sk_state == SMC_CLOSED)
2968                 sock->state = SS_UNCONNECTED;
2969         else
2970                 sock->state = SS_DISCONNECTING;
2971 out:
2972         release_sock(sk);
2973         return rc ? rc : rc1;
2974 }
2975
2976 static int __smc_getsockopt(struct socket *sock, int level, int optname,
2977                             char __user *optval, int __user *optlen)
2978 {
2979         struct smc_sock *smc;
2980         int val, len;
2981
2982         smc = smc_sk(sock->sk);
2983
2984         if (get_user(len, optlen))
2985                 return -EFAULT;
2986
2987         len = min_t(int, len, sizeof(int));
2988
2989         if (len < 0)
2990                 return -EINVAL;
2991
2992         switch (optname) {
2993         case SMC_LIMIT_HS:
2994                 val = smc->limit_smc_hs;
2995                 break;
2996         default:
2997                 return -EOPNOTSUPP;
2998         }
2999
3000         if (put_user(len, optlen))
3001                 return -EFAULT;
3002         if (copy_to_user(optval, &val, len))
3003                 return -EFAULT;
3004
3005         return 0;
3006 }
3007
3008 static int __smc_setsockopt(struct socket *sock, int level, int optname,
3009                             sockptr_t optval, unsigned int optlen)
3010 {
3011         struct sock *sk = sock->sk;
3012         struct smc_sock *smc;
3013         int val, rc;
3014
3015         smc = smc_sk(sk);
3016
3017         lock_sock(sk);
3018         switch (optname) {
3019         case SMC_LIMIT_HS:
3020                 if (optlen < sizeof(int)) {
3021                         rc = -EINVAL;
3022                         break;
3023                 }
3024                 if (copy_from_sockptr(&val, optval, sizeof(int))) {
3025                         rc = -EFAULT;
3026                         break;
3027                 }
3028
3029                 smc->limit_smc_hs = !!val;
3030                 rc = 0;
3031                 break;
3032         default:
3033                 rc = -EOPNOTSUPP;
3034                 break;
3035         }
3036         release_sock(sk);
3037
3038         return rc;
3039 }
3040
3041 static int smc_setsockopt(struct socket *sock, int level, int optname,
3042                           sockptr_t optval, unsigned int optlen)
3043 {
3044         struct sock *sk = sock->sk;
3045         struct smc_sock *smc;
3046         int val, rc;
3047
3048         if (level == SOL_TCP && optname == TCP_ULP)
3049                 return -EOPNOTSUPP;
3050         else if (level == SOL_SMC)
3051                 return __smc_setsockopt(sock, level, optname, optval, optlen);
3052
3053         smc = smc_sk(sk);
3054
3055         /* generic setsockopts reaching us here always apply to the
3056          * CLC socket
3057          */
3058         mutex_lock(&smc->clcsock_release_lock);
3059         if (!smc->clcsock) {
3060                 mutex_unlock(&smc->clcsock_release_lock);
3061                 return -EBADF;
3062         }
3063         if (unlikely(!smc->clcsock->ops->setsockopt))
3064                 rc = -EOPNOTSUPP;
3065         else
3066                 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
3067                                                    optval, optlen);
3068         if (smc->clcsock->sk->sk_err) {
3069                 sk->sk_err = smc->clcsock->sk->sk_err;
3070                 sk_error_report(sk);
3071         }
3072         mutex_unlock(&smc->clcsock_release_lock);
3073
3074         if (optlen < sizeof(int))
3075                 return -EINVAL;
3076         if (copy_from_sockptr(&val, optval, sizeof(int)))
3077                 return -EFAULT;
3078
3079         lock_sock(sk);
3080         if (rc || smc->use_fallback)
3081                 goto out;
3082         switch (optname) {
3083         case TCP_FASTOPEN:
3084         case TCP_FASTOPEN_CONNECT:
3085         case TCP_FASTOPEN_KEY:
3086         case TCP_FASTOPEN_NO_COOKIE:
3087                 /* option not supported by SMC */
3088                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
3089                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
3090                 } else {
3091                         rc = -EINVAL;
3092                 }
3093                 break;
3094         case TCP_NODELAY:
3095                 if (sk->sk_state != SMC_INIT &&
3096                     sk->sk_state != SMC_LISTEN &&
3097                     sk->sk_state != SMC_CLOSED) {
3098                         if (val) {
3099                                 SMC_STAT_INC(smc, ndly_cnt);
3100                                 smc_tx_pending(&smc->conn);
3101                                 cancel_delayed_work(&smc->conn.tx_work);
3102                         }
3103                 }
3104                 break;
3105         case TCP_CORK:
3106                 if (sk->sk_state != SMC_INIT &&
3107                     sk->sk_state != SMC_LISTEN &&
3108                     sk->sk_state != SMC_CLOSED) {
3109                         if (!val) {
3110                                 SMC_STAT_INC(smc, cork_cnt);
3111                                 smc_tx_pending(&smc->conn);
3112                                 cancel_delayed_work(&smc->conn.tx_work);
3113                         }
3114                 }
3115                 break;
3116         case TCP_DEFER_ACCEPT:
3117                 smc->sockopt_defer_accept = val;
3118                 break;
3119         default:
3120                 break;
3121         }
3122 out:
3123         release_sock(sk);
3124
3125         return rc;
3126 }
3127
3128 static int smc_getsockopt(struct socket *sock, int level, int optname,
3129                           char __user *optval, int __user *optlen)
3130 {
3131         struct smc_sock *smc;
3132         int rc;
3133
3134         if (level == SOL_SMC)
3135                 return __smc_getsockopt(sock, level, optname, optval, optlen);
3136
3137         smc = smc_sk(sock->sk);
3138         mutex_lock(&smc->clcsock_release_lock);
3139         if (!smc->clcsock) {
3140                 mutex_unlock(&smc->clcsock_release_lock);
3141                 return -EBADF;
3142         }
3143         /* socket options apply to the CLC socket */
3144         if (unlikely(!smc->clcsock->ops->getsockopt)) {
3145                 mutex_unlock(&smc->clcsock_release_lock);
3146                 return -EOPNOTSUPP;
3147         }
3148         rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
3149                                            optval, optlen);
3150         mutex_unlock(&smc->clcsock_release_lock);
3151         return rc;
3152 }
3153
3154 static int smc_ioctl(struct socket *sock, unsigned int cmd,
3155                      unsigned long arg)
3156 {
3157         union smc_host_cursor cons, urg;
3158         struct smc_connection *conn;
3159         struct smc_sock *smc;
3160         int answ;
3161
3162         smc = smc_sk(sock->sk);
3163         conn = &smc->conn;
3164         lock_sock(&smc->sk);
3165         if (smc->use_fallback) {
3166                 if (!smc->clcsock) {
3167                         release_sock(&smc->sk);
3168                         return -EBADF;
3169                 }
3170                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
3171                 release_sock(&smc->sk);
3172                 return answ;
3173         }
3174         switch (cmd) {
3175         case SIOCINQ: /* same as FIONREAD */
3176                 if (smc->sk.sk_state == SMC_LISTEN) {
3177                         release_sock(&smc->sk);
3178                         return -EINVAL;
3179                 }
3180                 if (smc->sk.sk_state == SMC_INIT ||
3181                     smc->sk.sk_state == SMC_CLOSED)
3182                         answ = 0;
3183                 else
3184                         answ = atomic_read(&smc->conn.bytes_to_rcv);
3185                 break;
3186         case SIOCOUTQ:
3187                 /* output queue size (not send + not acked) */
3188                 if (smc->sk.sk_state == SMC_LISTEN) {
3189                         release_sock(&smc->sk);
3190                         return -EINVAL;
3191                 }
3192                 if (smc->sk.sk_state == SMC_INIT ||
3193                     smc->sk.sk_state == SMC_CLOSED)
3194                         answ = 0;
3195                 else
3196                         answ = smc->conn.sndbuf_desc->len -
3197                                         atomic_read(&smc->conn.sndbuf_space);
3198                 break;
3199         case SIOCOUTQNSD:
3200                 /* output queue size (not send only) */
3201                 if (smc->sk.sk_state == SMC_LISTEN) {
3202                         release_sock(&smc->sk);
3203                         return -EINVAL;
3204                 }
3205                 if (smc->sk.sk_state == SMC_INIT ||
3206                     smc->sk.sk_state == SMC_CLOSED)
3207                         answ = 0;
3208                 else
3209                         answ = smc_tx_prepared_sends(&smc->conn);
3210                 break;
3211         case SIOCATMARK:
3212                 if (smc->sk.sk_state == SMC_LISTEN) {
3213                         release_sock(&smc->sk);
3214                         return -EINVAL;
3215                 }
3216                 if (smc->sk.sk_state == SMC_INIT ||
3217                     smc->sk.sk_state == SMC_CLOSED) {
3218                         answ = 0;
3219                 } else {
3220                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3221                         smc_curs_copy(&urg, &conn->urg_curs, conn);
3222                         answ = smc_curs_diff(conn->rmb_desc->len,
3223                                              &cons, &urg) == 1;
3224                 }
3225                 break;
3226         default:
3227                 release_sock(&smc->sk);
3228                 return -ENOIOCTLCMD;
3229         }
3230         release_sock(&smc->sk);
3231
3232         return put_user(answ, (int __user *)arg);
3233 }
3234
3235 /* Map the affected portions of the rmbe into an spd, note the number of bytes
3236  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3237  * updates till whenever a respective page has been fully processed.
3238  * Note that subsequent recv() calls have to wait till all splice() processing
3239  * completed.
3240  */
3241 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3242                                struct pipe_inode_info *pipe, size_t len,
3243                                unsigned int flags)
3244 {
3245         struct sock *sk = sock->sk;
3246         struct smc_sock *smc;
3247         int rc = -ENOTCONN;
3248
3249         smc = smc_sk(sk);
3250         lock_sock(sk);
3251         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3252                 /* socket was connected before, no more data to read */
3253                 rc = 0;
3254                 goto out;
3255         }
3256         if (sk->sk_state == SMC_INIT ||
3257             sk->sk_state == SMC_LISTEN ||
3258             sk->sk_state == SMC_CLOSED)
3259                 goto out;
3260
3261         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3262                 rc = 0;
3263                 goto out;
3264         }
3265
3266         if (smc->use_fallback) {
3267                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3268                                                     pipe, len, flags);
3269         } else {
3270                 if (*ppos) {
3271                         rc = -ESPIPE;
3272                         goto out;
3273                 }
3274                 if (flags & SPLICE_F_NONBLOCK)
3275                         flags = MSG_DONTWAIT;
3276                 else
3277                         flags = 0;
3278                 SMC_STAT_INC(smc, splice_cnt);
3279                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
3280         }
3281 out:
3282         release_sock(sk);
3283
3284         return rc;
3285 }
3286
3287 /* must look like tcp */
3288 static const struct proto_ops smc_sock_ops = {
3289         .family         = PF_SMC,
3290         .owner          = THIS_MODULE,
3291         .release        = smc_release,
3292         .bind           = smc_bind,
3293         .connect        = smc_connect,
3294         .socketpair     = sock_no_socketpair,
3295         .accept         = smc_accept,
3296         .getname        = smc_getname,
3297         .poll           = smc_poll,
3298         .ioctl          = smc_ioctl,
3299         .listen         = smc_listen,
3300         .shutdown       = smc_shutdown,
3301         .setsockopt     = smc_setsockopt,
3302         .getsockopt     = smc_getsockopt,
3303         .sendmsg        = smc_sendmsg,
3304         .recvmsg        = smc_recvmsg,
3305         .mmap           = sock_no_mmap,
3306         .splice_read    = smc_splice_read,
3307 };
3308
3309 static int __smc_create(struct net *net, struct socket *sock, int protocol,
3310                         int kern, struct socket *clcsock)
3311 {
3312         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
3313         struct smc_sock *smc;
3314         struct sock *sk;
3315         int rc;
3316
3317         rc = -ESOCKTNOSUPPORT;
3318         if (sock->type != SOCK_STREAM)
3319                 goto out;
3320
3321         rc = -EPROTONOSUPPORT;
3322         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
3323                 goto out;
3324
3325         rc = -ENOBUFS;
3326         sock->ops = &smc_sock_ops;
3327         sock->state = SS_UNCONNECTED;
3328         sk = smc_sock_alloc(net, sock, protocol);
3329         if (!sk)
3330                 goto out;
3331
3332         /* create internal TCP socket for CLC handshake and fallback */
3333         smc = smc_sk(sk);
3334         smc->use_fallback = false; /* assume rdma capability first */
3335         smc->fallback_rsn = 0;
3336
3337         /* default behavior from limit_smc_hs in every net namespace */
3338         smc->limit_smc_hs = net->smc.limit_smc_hs;
3339
3340         rc = 0;
3341         if (!clcsock) {
3342                 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3343                                       &smc->clcsock);
3344                 if (rc) {
3345                         sk_common_release(sk);
3346                         goto out;
3347                 }
3348
3349                 /* smc_clcsock_release() does not wait smc->clcsock->sk's
3350                  * destruction;  its sk_state might not be TCP_CLOSE after
3351                  * smc->sk is close()d, and TCP timers can be fired later,
3352                  * which need net ref.
3353                  */
3354                 sk = smc->clcsock->sk;
3355                 __netns_tracker_free(net, &sk->ns_tracker, false);
3356                 sk->sk_net_refcnt = 1;
3357                 get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
3358                 sock_inuse_add(net, 1);
3359         } else {
3360                 smc->clcsock = clcsock;
3361         }
3362
3363 out:
3364         return rc;
3365 }
3366
3367 static int smc_create(struct net *net, struct socket *sock, int protocol,
3368                       int kern)
3369 {
3370         return __smc_create(net, sock, protocol, kern, NULL);
3371 }
3372
3373 static const struct net_proto_family smc_sock_family_ops = {
3374         .family = PF_SMC,
3375         .owner  = THIS_MODULE,
3376         .create = smc_create,
3377 };
3378
3379 static int smc_ulp_init(struct sock *sk)
3380 {
3381         struct socket *tcp = sk->sk_socket;
3382         struct net *net = sock_net(sk);
3383         struct socket *smcsock;
3384         int protocol, ret;
3385
3386         /* only TCP can be replaced */
3387         if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3388             (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3389                 return -ESOCKTNOSUPPORT;
3390         /* don't handle wq now */
3391         if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3392                 return -ENOTCONN;
3393
3394         if (sk->sk_family == AF_INET)
3395                 protocol = SMCPROTO_SMC;
3396         else
3397                 protocol = SMCPROTO_SMC6;
3398
3399         smcsock = sock_alloc();
3400         if (!smcsock)
3401                 return -ENFILE;
3402
3403         smcsock->type = SOCK_STREAM;
3404         __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3405         ret = __smc_create(net, smcsock, protocol, 1, tcp);
3406         if (ret) {
3407                 sock_release(smcsock); /* module_put() which ops won't be NULL */
3408                 return ret;
3409         }
3410
3411         /* replace tcp socket to smc */
3412         smcsock->file = tcp->file;
3413         smcsock->file->private_data = smcsock;
3414         smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3415         smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3416         tcp->file = NULL;
3417
3418         return ret;
3419 }
3420
3421 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3422                           const gfp_t priority)
3423 {
3424         struct inet_connection_sock *icsk = inet_csk(newsk);
3425
3426         /* don't inherit ulp ops to child when listen */
3427         icsk->icsk_ulp_ops = NULL;
3428 }
3429
3430 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3431         .name           = "smc",
3432         .owner          = THIS_MODULE,
3433         .init           = smc_ulp_init,
3434         .clone          = smc_ulp_clone,
3435 };
3436
3437 unsigned int smc_net_id;
3438
3439 static __net_init int smc_net_init(struct net *net)
3440 {
3441         int rc;
3442
3443         rc = smc_sysctl_net_init(net);
3444         if (rc)
3445                 return rc;
3446         return smc_pnet_net_init(net);
3447 }
3448
3449 static void __net_exit smc_net_exit(struct net *net)
3450 {
3451         smc_sysctl_net_exit(net);
3452         smc_pnet_net_exit(net);
3453 }
3454
3455 static __net_init int smc_net_stat_init(struct net *net)
3456 {
3457         return smc_stats_init(net);
3458 }
3459
3460 static void __net_exit smc_net_stat_exit(struct net *net)
3461 {
3462         smc_stats_exit(net);
3463 }
3464
3465 static struct pernet_operations smc_net_ops = {
3466         .init = smc_net_init,
3467         .exit = smc_net_exit,
3468         .id   = &smc_net_id,
3469         .size = sizeof(struct smc_net),
3470 };
3471
3472 static struct pernet_operations smc_net_stat_ops = {
3473         .init = smc_net_stat_init,
3474         .exit = smc_net_stat_exit,
3475 };
3476
3477 static int __init smc_init(void)
3478 {
3479         int rc;
3480
3481         rc = register_pernet_subsys(&smc_net_ops);
3482         if (rc)
3483                 return rc;
3484
3485         rc = register_pernet_subsys(&smc_net_stat_ops);
3486         if (rc)
3487                 goto out_pernet_subsys;
3488
3489         rc = smc_ism_init();
3490         if (rc)
3491                 goto out_pernet_subsys_stat;
3492         smc_clc_init();
3493
3494         rc = smc_nl_init();
3495         if (rc)
3496                 goto out_ism;
3497
3498         rc = smc_pnet_init();
3499         if (rc)
3500                 goto out_nl;
3501
3502         rc = -ENOMEM;
3503
3504         smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3505         if (!smc_tcp_ls_wq)
3506                 goto out_pnet;
3507
3508         smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3509         if (!smc_hs_wq)
3510                 goto out_alloc_tcp_ls_wq;
3511
3512         smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3513         if (!smc_close_wq)
3514                 goto out_alloc_hs_wq;
3515
3516         rc = smc_core_init();
3517         if (rc) {
3518                 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
3519                 goto out_alloc_wqs;
3520         }
3521
3522         rc = smc_llc_init();
3523         if (rc) {
3524                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
3525                 goto out_core;
3526         }
3527
3528         rc = smc_cdc_init();
3529         if (rc) {
3530                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
3531                 goto out_core;
3532         }
3533
3534         rc = proto_register(&smc_proto, 1);
3535         if (rc) {
3536                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
3537                 goto out_core;
3538         }
3539
3540         rc = proto_register(&smc_proto6, 1);
3541         if (rc) {
3542                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3543                 goto out_proto;
3544         }
3545
3546         rc = sock_register(&smc_sock_family_ops);
3547         if (rc) {
3548                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
3549                 goto out_proto6;
3550         }
3551         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
3552         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
3553
3554         rc = smc_ib_register_client();
3555         if (rc) {
3556                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3557                 goto out_sock;
3558         }
3559
3560         rc = tcp_register_ulp(&smc_ulp_ops);
3561         if (rc) {
3562                 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
3563                 goto out_ib;
3564         }
3565
3566         static_branch_enable(&tcp_have_smc);
3567         return 0;
3568
3569 out_ib:
3570         smc_ib_unregister_client();
3571 out_sock:
3572         sock_unregister(PF_SMC);
3573 out_proto6:
3574         proto_unregister(&smc_proto6);
3575 out_proto:
3576         proto_unregister(&smc_proto);
3577 out_core:
3578         smc_core_exit();
3579 out_alloc_wqs:
3580         destroy_workqueue(smc_close_wq);
3581 out_alloc_hs_wq:
3582         destroy_workqueue(smc_hs_wq);
3583 out_alloc_tcp_ls_wq:
3584         destroy_workqueue(smc_tcp_ls_wq);
3585 out_pnet:
3586         smc_pnet_exit();
3587 out_nl:
3588         smc_nl_exit();
3589 out_ism:
3590         smc_clc_exit();
3591         smc_ism_exit();
3592 out_pernet_subsys_stat:
3593         unregister_pernet_subsys(&smc_net_stat_ops);
3594 out_pernet_subsys:
3595         unregister_pernet_subsys(&smc_net_ops);
3596
3597         return rc;
3598 }
3599
3600 static void __exit smc_exit(void)
3601 {
3602         static_branch_disable(&tcp_have_smc);
3603         tcp_unregister_ulp(&smc_ulp_ops);
3604         sock_unregister(PF_SMC);
3605         smc_core_exit();
3606         smc_ib_unregister_client();
3607         smc_ism_exit();
3608         destroy_workqueue(smc_close_wq);
3609         destroy_workqueue(smc_tcp_ls_wq);
3610         destroy_workqueue(smc_hs_wq);
3611         proto_unregister(&smc_proto6);
3612         proto_unregister(&smc_proto);
3613         smc_pnet_exit();
3614         smc_nl_exit();
3615         smc_clc_exit();
3616         unregister_pernet_subsys(&smc_net_stat_ops);
3617         unregister_pernet_subsys(&smc_net_ops);
3618         rcu_barrier();
3619 }
3620
3621 module_init(smc_init);
3622 module_exit(smc_exit);
3623
3624 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
3625 MODULE_DESCRIPTION("smc socket address family");
3626 MODULE_LICENSE("GPL");
3627 MODULE_ALIAS_NETPROTO(PF_SMC);
3628 MODULE_ALIAS_TCP_ULP("smc");
3629 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);