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 <[email protected]>
  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 #include "smc_loopback.h"
  57
  58 static DEFINE_MUTEX(smc_server_lgr_pending);    /* serialize link group
  59                                                  * creation on server
  60                                                  */
  61 static DEFINE_MUTEX(smc_client_lgr_pending);    /* serialize link group
  62                                                  * creation on client
  63                                                  */
  64
  65 static struct workqueue_struct  *smc_tcp_ls_wq; /* wq for tcp listen work */
  66 struct workqueue_struct *smc_hs_wq;     /* wq for handshake work */
  67 struct workqueue_struct *smc_close_wq;  /* wq for close work */
  68
  69 static void smc_tcp_listen_work(struct work_struct *);
  70 static void smc_connect_work(struct work_struct *);
  71
  72 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb)
  73 {
  74         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
  75         void *hdr;
  76
  77         if (cb_ctx->pos[0])
  78                 goto out;
  79
  80         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  81                           &smc_gen_nl_family, NLM_F_MULTI,
  82                           SMC_NETLINK_DUMP_HS_LIMITATION);
  83         if (!hdr)
  84                 return -ENOMEM;
  85
  86         if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED,
  87                        sock_net(skb->sk)->smc.limit_smc_hs))
  88                 goto err;
  89
  90         genlmsg_end(skb, hdr);
  91         cb_ctx->pos[0] = 1;
  92 out:
  93         return skb->len;
  94 err:
  95         genlmsg_cancel(skb, hdr);
  96         return -EMSGSIZE;
  97 }
  98
  99 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
 100 {
 101         sock_net(skb->sk)->smc.limit_smc_hs = true;
 102         return 0;
 103 }
 104
 105 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
 106 {
 107         sock_net(skb->sk)->smc.limit_smc_hs = false;
 108         return 0;
 109 }
 110
 111 static void smc_set_keepalive(struct sock *sk, int val)
 112 {
 113         struct smc_sock *smc = smc_sk(sk);
 114
 115         smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
 116 }
 117
 118 static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk,
 119                                           struct sk_buff *skb,
 120                                           struct request_sock *req,
 121                                           struct dst_entry *dst,
 122                                           struct request_sock *req_unhash,
 123                                           bool *own_req)
 124 {
 125         struct smc_sock *smc;
 126         struct sock *child;
 127
 128         smc = smc_clcsock_user_data(sk);
 129
 130         if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) >
 131                                 sk->sk_max_ack_backlog)
 132                 goto drop;
 133
 134         if (sk_acceptq_is_full(&smc->sk)) {
 135                 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 136                 goto drop;
 137         }
 138
 139         /* passthrough to original syn recv sock fct */
 140         child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash,
 141                                                own_req);
 142         /* child must not inherit smc or its ops */
 143         if (child) {
 144                 rcu_assign_sk_user_data(child, NULL);
 145
 146                 /* v4-mapped sockets don't inherit parent ops. Don't restore. */
 147                 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops)
 148                         inet_csk(child)->icsk_af_ops = smc->ori_af_ops;
 149         }
 150         return child;
 151
 152 drop:
 153         dst_release(dst);
 154         tcp_listendrop(sk);
 155         return NULL;
 156 }
 157
 158 static bool smc_hs_congested(const struct sock *sk)
 159 {
 160         const struct smc_sock *smc;
 161
 162         smc = smc_clcsock_user_data(sk);
 163
 164         if (!smc)
 165                 return true;
 166
 167         if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
 168                 return true;
 169
 170         return false;
 171 }
 172
 173 static struct smc_hashinfo smc_v4_hashinfo = {
 174         .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
 175 };
 176
 177 static struct smc_hashinfo smc_v6_hashinfo = {
 178         .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
 179 };
 180
 181 static int smc_hash_sk(struct sock *sk)
 182 {
 183         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 184         struct hlist_head *head;
 185
 186         head = &h->ht;
 187
 188         write_lock_bh(&h->lock);
 189         sk_add_node(sk, head);
 190         write_unlock_bh(&h->lock);
 191         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 192
 193         return 0;
 194 }
 195
 196 static 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
 206 /* This will be called before user really release sock_lock. So do the
 207  * work which we didn't do because of user hold the sock_lock in the
 208  * BH context
 209  */
 210 static void smc_release_cb(struct sock *sk)
 211 {
 212         struct smc_sock *smc = smc_sk(sk);
 213
 214         if (smc->conn.tx_in_release_sock) {
 215                 smc_tx_pending(&smc->conn);
 216                 smc->conn.tx_in_release_sock = false;
 217         }
 218 }
 219
 220 struct proto smc_proto = {
 221         .name           = "SMC",
 222         .owner          = THIS_MODULE,
 223         .keepalive      = smc_set_keepalive,
 224         .hash           = smc_hash_sk,
 225         .unhash         = smc_unhash_sk,
 226         .release_cb     = smc_release_cb,
 227         .obj_size       = sizeof(struct smc_sock),
 228         .h.smc_hash     = &smc_v4_hashinfo,
 229         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 230 };
 231 EXPORT_SYMBOL_GPL(smc_proto);
 232
 233 struct proto smc_proto6 = {
 234         .name           = "SMC6",
 235         .owner          = THIS_MODULE,
 236         .keepalive      = smc_set_keepalive,
 237         .hash           = smc_hash_sk,
 238         .unhash         = smc_unhash_sk,
 239         .release_cb     = smc_release_cb,
 240         .obj_size       = sizeof(struct smc_sock),
 241         .h.smc_hash     = &smc_v6_hashinfo,
 242         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 243 };
 244 EXPORT_SYMBOL_GPL(smc_proto6);
 245
 246 static void smc_fback_restore_callbacks(struct smc_sock *smc)
 247 {
 248         struct sock *clcsk = smc->clcsock->sk;
 249
 250         write_lock_bh(&clcsk->sk_callback_lock);
 251         clcsk->sk_user_data = NULL;
 252
 253         smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
 254         smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
 255         smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
 256         smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
 257
 258         write_unlock_bh(&clcsk->sk_callback_lock);
 259 }
 260
 261 static void smc_restore_fallback_changes(struct smc_sock *smc)
 262 {
 263         if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
 264                 smc->clcsock->file->private_data = smc->sk.sk_socket;
 265                 smc->clcsock->file = NULL;
 266                 smc_fback_restore_callbacks(smc);
 267         }
 268 }
 269
 270 static int __smc_release(struct smc_sock *smc)
 271 {
 272         struct sock *sk = &smc->sk;
 273         int rc = 0;
 274
 275         if (!smc->use_fallback) {
 276                 rc = smc_close_active(smc);
 277                 smc_sock_set_flag(sk, SOCK_DEAD);
 278                 sk->sk_shutdown |= SHUTDOWN_MASK;
 279         } else {
 280                 if (sk->sk_state != SMC_CLOSED) {
 281                         if (sk->sk_state != SMC_LISTEN &&
 282                             sk->sk_state != SMC_INIT)
 283                                 sock_put(sk); /* passive closing */
 284                         if (sk->sk_state == SMC_LISTEN) {
 285                                 /* wake up clcsock accept */
 286                                 rc = kernel_sock_shutdown(smc->clcsock,
 287                                                           SHUT_RDWR);
 288                         }
 289                         sk->sk_state = SMC_CLOSED;
 290                         sk->sk_state_change(sk);
 291                 }
 292                 smc_restore_fallback_changes(smc);
 293         }
 294
 295         sk->sk_prot->unhash(sk);
 296
 297         if (sk->sk_state == SMC_CLOSED) {
 298                 if (smc->clcsock) {
 299                         release_sock(sk);
 300                         smc_clcsock_release(smc);
 301                         lock_sock(sk);
 302                 }
 303                 if (!smc->use_fallback)
 304                         smc_conn_free(&smc->conn);
 305         }
 306
 307         return rc;
 308 }
 309
 310 static int smc_release(struct socket *sock)
 311 {
 312         struct sock *sk = sock->sk;
 313         struct smc_sock *smc;
 314         int old_state, rc = 0;
 315
 316         if (!sk)
 317                 goto out;
 318
 319         sock_hold(sk); /* sock_put below */
 320         smc = smc_sk(sk);
 321
 322         old_state = sk->sk_state;
 323
 324         /* cleanup for a dangling non-blocking connect */
 325         if (smc->connect_nonblock && old_state == SMC_INIT)
 326                 tcp_abort(smc->clcsock->sk, ECONNABORTED);
 327
 328         if (cancel_work_sync(&smc->connect_work))
 329                 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
 330
 331         if (sk->sk_state == SMC_LISTEN)
 332                 /* smc_close_non_accepted() is called and acquires
 333                  * sock lock for child sockets again
 334                  */
 335                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 336         else
 337                 lock_sock(sk);
 338
 339         if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
 340             !smc->use_fallback)
 341                 smc_close_active_abort(smc);
 342
 343         rc = __smc_release(smc);
 344
 345         /* detach socket */
 346         sock_orphan(sk);
 347         sock->sk = NULL;
 348         release_sock(sk);
 349
 350         sock_put(sk); /* sock_hold above */
 351         sock_put(sk); /* final sock_put */
 352 out:
 353         return rc;
 354 }
 355
 356 static void smc_destruct(struct sock *sk)
 357 {
 358         if (sk->sk_state != SMC_CLOSED)
 359                 return;
 360         if (!sock_flag(sk, SOCK_DEAD))
 361                 return;
 362 }
 363
 364 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
 365                                    int protocol)
 366 {
 367         struct smc_sock *smc;
 368         struct proto *prot;
 369         struct sock *sk;
 370
 371         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
 372         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
 373         if (!sk)
 374                 return NULL;
 375
 376         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
 377         sk->sk_state = SMC_INIT;
 378         sk->sk_destruct = smc_destruct;
 379         sk->sk_protocol = protocol;
 380         WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
 381         WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
 382         smc = smc_sk(sk);
 383         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
 384         INIT_WORK(&smc->connect_work, smc_connect_work);
 385         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
 386         INIT_LIST_HEAD(&smc->accept_q);
 387         spin_lock_init(&smc->accept_q_lock);
 388         spin_lock_init(&smc->conn.send_lock);
 389         sk->sk_prot->hash(sk);
 390         mutex_init(&smc->clcsock_release_lock);
 391         smc_init_saved_callbacks(smc);
 392
 393         return sk;
 394 }
 395
 396 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
 397                     int addr_len)
 398 {
 399         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 400         struct sock *sk = sock->sk;
 401         struct smc_sock *smc;
 402         int rc;
 403
 404         smc = smc_sk(sk);
 405
 406         /* replicate tests from inet_bind(), to be safe wrt. future changes */
 407         rc = -EINVAL;
 408         if (addr_len < sizeof(struct sockaddr_in))
 409                 goto out;
 410
 411         rc = -EAFNOSUPPORT;
 412         if (addr->sin_family != AF_INET &&
 413             addr->sin_family != AF_INET6 &&
 414             addr->sin_family != AF_UNSPEC)
 415                 goto out;
 416         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
 417         if (addr->sin_family == AF_UNSPEC &&
 418             addr->sin_addr.s_addr != htonl(INADDR_ANY))
 419                 goto out;
 420
 421         lock_sock(sk);
 422
 423         /* Check if socket is already active */
 424         rc = -EINVAL;
 425         if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
 426                 goto out_rel;
 427
 428         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
 429         smc->clcsock->sk->sk_reuseport = sk->sk_reuseport;
 430         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
 431
 432 out_rel:
 433         release_sock(sk);
 434 out:
 435         return rc;
 436 }
 437
 438 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
 439  * clc socket (since smc is not called for these options from net/core)
 440  */
 441
 442 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
 443                              (1UL << SOCK_KEEPOPEN) | \
 444                              (1UL << SOCK_LINGER) | \
 445                              (1UL << SOCK_BROADCAST) | \
 446                              (1UL << SOCK_TIMESTAMP) | \
 447                              (1UL << SOCK_DBG) | \
 448                              (1UL << SOCK_RCVTSTAMP) | \
 449                              (1UL << SOCK_RCVTSTAMPNS) | \
 450                              (1UL << SOCK_LOCALROUTE) | \
 451                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
 452                              (1UL << SOCK_RXQ_OVFL) | \
 453                              (1UL << SOCK_WIFI_STATUS) | \
 454                              (1UL << SOCK_NOFCS) | \
 455                              (1UL << SOCK_FILTER_LOCKED) | \
 456                              (1UL << SOCK_TSTAMP_NEW))
 457
 458 /* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */
 459 static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk,
 460                                      unsigned long mask)
 461 {
 462         nsk->sk_userlocks = osk->sk_userlocks;
 463         if (osk->sk_userlocks & SOCK_SNDBUF_LOCK)
 464                 nsk->sk_sndbuf = osk->sk_sndbuf;
 465         if (osk->sk_userlocks & SOCK_RCVBUF_LOCK)
 466                 nsk->sk_rcvbuf = osk->sk_rcvbuf;
 467 }
 468
 469 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
 470                                    unsigned long mask)
 471 {
 472         /* options we don't get control via setsockopt for */
 473         nsk->sk_type = osk->sk_type;
 474         nsk->sk_sndtimeo = osk->sk_sndtimeo;
 475         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
 476         nsk->sk_mark = READ_ONCE(osk->sk_mark);
 477         nsk->sk_priority = READ_ONCE(osk->sk_priority);
 478         nsk->sk_rcvlowat = osk->sk_rcvlowat;
 479         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
 480         nsk->sk_err = osk->sk_err;
 481
 482         nsk->sk_flags &= ~mask;
 483         nsk->sk_flags |= osk->sk_flags & mask;
 484
 485         smc_adjust_sock_bufsizes(nsk, osk, mask);
 486 }
 487
 488 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
 489 {
 490         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
 491 }
 492
 493 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
 494                              (1UL << SOCK_KEEPOPEN) | \
 495                              (1UL << SOCK_LINGER) | \
 496                              (1UL << SOCK_DBG))
 497 /* copy only settings and flags relevant for smc from clc to smc socket */
 498 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
 499 {
 500         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
 501 }
 502
 503 /* register the new vzalloced sndbuf on all links */
 504 static int smcr_lgr_reg_sndbufs(struct smc_link *link,
 505                                 struct smc_buf_desc *snd_desc)
 506 {
 507         struct smc_link_group *lgr = link->lgr;
 508         int i, rc = 0;
 509
 510         if (!snd_desc->is_vm)
 511                 return -EINVAL;
 512
 513         /* protect against parallel smcr_link_reg_buf() */
 514         down_write(&lgr->llc_conf_mutex);
 515         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 516                 if (!smc_link_active(&lgr->lnk[i]))
 517                         continue;
 518                 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc);
 519                 if (rc)
 520                         break;
 521         }
 522         up_write(&lgr->llc_conf_mutex);
 523         return rc;
 524 }
 525
 526 /* register the new rmb on all links */
 527 static int smcr_lgr_reg_rmbs(struct smc_link *link,
 528                              struct smc_buf_desc *rmb_desc)
 529 {
 530         struct smc_link_group *lgr = link->lgr;
 531         bool do_slow = false;
 532         int i, rc = 0;
 533
 534         rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
 535         if (rc)
 536                 return rc;
 537
 538         down_read(&lgr->llc_conf_mutex);
 539         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 540                 if (!smc_link_active(&lgr->lnk[i]))
 541                         continue;
 542                 if (!rmb_desc->is_reg_mr[link->link_idx]) {
 543                         up_read(&lgr->llc_conf_mutex);
 544                         goto slow_path;
 545                 }
 546         }
 547         /* mr register already */
 548         goto fast_path;
 549 slow_path:
 550         do_slow = true;
 551         /* protect against parallel smc_llc_cli_rkey_exchange() and
 552          * parallel smcr_link_reg_buf()
 553          */
 554         down_write(&lgr->llc_conf_mutex);
 555         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 556                 if (!smc_link_active(&lgr->lnk[i]))
 557                         continue;
 558                 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc);
 559                 if (rc)
 560                         goto out;
 561         }
 562 fast_path:
 563         /* exchange confirm_rkey msg with peer */
 564         rc = smc_llc_do_confirm_rkey(link, rmb_desc);
 565         if (rc) {
 566                 rc = -EFAULT;
 567                 goto out;
 568         }
 569         rmb_desc->is_conf_rkey = true;
 570 out:
 571         do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex);
 572         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
 573         return rc;
 574 }
 575
 576 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
 577 {
 578         struct smc_link *link = smc->conn.lnk;
 579         struct smc_llc_qentry *qentry;
 580         int rc;
 581
 582         /* Receive CONFIRM LINK request from server over RoCE fabric.
 583          * Increasing the client's timeout by twice as much as the server's
 584          * timeout by default can temporarily avoid decline messages of
 585          * both sides crossing or colliding
 586          */
 587         qentry = smc_llc_wait(link->lgr, NULL, 2 * SMC_LLC_WAIT_TIME,
 588                               SMC_LLC_CONFIRM_LINK);
 589         if (!qentry) {
 590                 struct smc_clc_msg_decline dclc;
 591
 592                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 593                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 594                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
 595         }
 596         smc_llc_save_peer_uid(qentry);
 597         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
 598         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
 599         if (rc)
 600                 return SMC_CLC_DECL_RMBE_EC;
 601
 602         rc = smc_ib_modify_qp_rts(link);
 603         if (rc)
 604                 return SMC_CLC_DECL_ERR_RDYLNK;
 605
 606         smc_wr_remember_qp_attr(link);
 607
 608         /* reg the sndbuf if it was vzalloced */
 609         if (smc->conn.sndbuf_desc->is_vm) {
 610                 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
 611                         return SMC_CLC_DECL_ERR_REGBUF;
 612         }
 613
 614         /* reg the rmb */
 615         if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
 616                 return SMC_CLC_DECL_ERR_REGBUF;
 617
 618         /* confirm_rkey is implicit on 1st contact */
 619         smc->conn.rmb_desc->is_conf_rkey = true;
 620
 621         /* send CONFIRM LINK response over RoCE fabric */
 622         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
 623         if (rc < 0)
 624                 return SMC_CLC_DECL_TIMEOUT_CL;
 625
 626         smc_llc_link_active(link);
 627         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
 628
 629         if (link->lgr->max_links > 1) {
 630                 /* optional 2nd link, receive ADD LINK request from server */
 631                 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
 632                                       SMC_LLC_ADD_LINK);
 633                 if (!qentry) {
 634                         struct smc_clc_msg_decline dclc;
 635
 636                         rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 637                                               SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 638                         if (rc == -EAGAIN)
 639                                 rc = 0; /* no DECLINE received, go with one link */
 640                         return rc;
 641                 }
 642                 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
 643                 smc_llc_cli_add_link(link, qentry);
 644         }
 645         return 0;
 646 }
 647
 648 static bool smc_isascii(char *hostname)
 649 {
 650         int i;
 651
 652         for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
 653                 if (!isascii(hostname[i]))
 654                         return false;
 655         return true;
 656 }
 657
 658 static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
 659                                         struct smc_clc_msg_accept_confirm *clc)
 660 {
 661         struct smc_clc_first_contact_ext *fce;
 662         int clc_v2_len;
 663
 664         if (clc->hdr.version == SMC_V1 ||
 665             !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
 666                 return;
 667
 668         if (smc->conn.lgr->is_smcd) {
 669                 memcpy(smc->conn.lgr->negotiated_eid, clc->d1.eid,
 670                        SMC_MAX_EID_LEN);
 671                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, d1);
 672         } else {
 673                 memcpy(smc->conn.lgr->negotiated_eid, clc->r1.eid,
 674                        SMC_MAX_EID_LEN);
 675                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, r1);
 676         }
 677         fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len);
 678         smc->conn.lgr->peer_os = fce->os_type;
 679         smc->conn.lgr->peer_smc_release = fce->release;
 680         if (smc_isascii(fce->hostname))
 681                 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
 682                        SMC_MAX_HOSTNAME_LEN);
 683 }
 684
 685 static void smcr_conn_save_peer_info(struct smc_sock *smc,
 686                                      struct smc_clc_msg_accept_confirm *clc)
 687 {
 688         int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
 689
 690         smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
 691         smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
 692         smc->conn.peer_rmbe_size = bufsize;
 693         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 694         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
 695 }
 696
 697 static void smcd_conn_save_peer_info(struct smc_sock *smc,
 698                                      struct smc_clc_msg_accept_confirm *clc)
 699 {
 700         int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
 701
 702         smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
 703         smc->conn.peer_token = ntohll(clc->d0.token);
 704         /* msg header takes up space in the buffer */
 705         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
 706         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 707         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
 708 }
 709
 710 static void smc_conn_save_peer_info(struct smc_sock *smc,
 711                                     struct smc_clc_msg_accept_confirm *clc)
 712 {
 713         if (smc->conn.lgr->is_smcd)
 714                 smcd_conn_save_peer_info(smc, clc);
 715         else
 716                 smcr_conn_save_peer_info(smc, clc);
 717         smc_conn_save_peer_info_fce(smc, clc);
 718 }
 719
 720 static void smc_link_save_peer_info(struct smc_link *link,
 721                                     struct smc_clc_msg_accept_confirm *clc,
 722                                     struct smc_init_info *ini)
 723 {
 724         link->peer_qpn = ntoh24(clc->r0.qpn);
 725         memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
 726         memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
 727         link->peer_psn = ntoh24(clc->r0.psn);
 728         link->peer_mtu = clc->r0.qp_mtu;
 729 }
 730
 731 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
 732                                        struct smc_stats_fback *fback_arr)
 733 {
 734         int cnt;
 735
 736         for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
 737                 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
 738                         fback_arr[cnt].count++;
 739                         break;
 740                 }
 741                 if (!fback_arr[cnt].fback_code) {
 742                         fback_arr[cnt].fback_code = smc->fallback_rsn;
 743                         fback_arr[cnt].count++;
 744                         break;
 745                 }
 746         }
 747 }
 748
 749 static void smc_stat_fallback(struct smc_sock *smc)
 750 {
 751         struct net *net = sock_net(&smc->sk);
 752
 753         mutex_lock(&net->smc.mutex_fback_rsn);
 754         if (smc->listen_smc) {
 755                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
 756                 net->smc.fback_rsn->srv_fback_cnt++;
 757         } else {
 758                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
 759                 net->smc.fback_rsn->clnt_fback_cnt++;
 760         }
 761         mutex_unlock(&net->smc.mutex_fback_rsn);
 762 }
 763
 764 /* must be called under rcu read lock */
 765 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
 766 {
 767         struct socket_wq *wq;
 768         __poll_t flags;
 769
 770         wq = rcu_dereference(smc->sk.sk_wq);
 771         if (!skwq_has_sleeper(wq))
 772                 return;
 773
 774         /* wake up smc sk->sk_wq */
 775         if (!key) {
 776                 /* sk_state_change */
 777                 wake_up_interruptible_all(&wq->wait);
 778         } else {
 779                 flags = key_to_poll(key);
 780                 if (flags & (EPOLLIN | EPOLLOUT))
 781                         /* sk_data_ready or sk_write_space */
 782                         wake_up_interruptible_sync_poll(&wq->wait, flags);
 783                 else if (flags & EPOLLERR)
 784                         /* sk_error_report */
 785                         wake_up_interruptible_poll(&wq->wait, flags);
 786         }
 787 }
 788
 789 static int smc_fback_mark_woken(wait_queue_entry_t *wait,
 790                                 unsigned int mode, int sync, void *key)
 791 {
 792         struct smc_mark_woken *mark =
 793                 container_of(wait, struct smc_mark_woken, wait_entry);
 794
 795         mark->woken = true;
 796         mark->key = key;
 797         return 0;
 798 }
 799
 800 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
 801                                      void (*clcsock_callback)(struct sock *sk))
 802 {
 803         struct smc_mark_woken mark = { .woken = false };
 804         struct socket_wq *wq;
 805
 806         init_waitqueue_func_entry(&mark.wait_entry,
 807                                   smc_fback_mark_woken);
 808         rcu_read_lock();
 809         wq = rcu_dereference(clcsk->sk_wq);
 810         if (!wq)
 811                 goto out;
 812         add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 813         clcsock_callback(clcsk);
 814         remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 815
 816         if (mark.woken)
 817                 smc_fback_wakeup_waitqueue(smc, mark.key);
 818 out:
 819         rcu_read_unlock();
 820 }
 821
 822 static void smc_fback_state_change(struct sock *clcsk)
 823 {
 824         struct smc_sock *smc;
 825
 826         read_lock_bh(&clcsk->sk_callback_lock);
 827         smc = smc_clcsock_user_data(clcsk);
 828         if (smc)
 829                 smc_fback_forward_wakeup(smc, clcsk,
 830                                          smc->clcsk_state_change);
 831         read_unlock_bh(&clcsk->sk_callback_lock);
 832 }
 833
 834 static void smc_fback_data_ready(struct sock *clcsk)
 835 {
 836         struct smc_sock *smc;
 837
 838         read_lock_bh(&clcsk->sk_callback_lock);
 839         smc = smc_clcsock_user_data(clcsk);
 840         if (smc)
 841                 smc_fback_forward_wakeup(smc, clcsk,
 842                                          smc->clcsk_data_ready);
 843         read_unlock_bh(&clcsk->sk_callback_lock);
 844 }
 845
 846 static void smc_fback_write_space(struct sock *clcsk)
 847 {
 848         struct smc_sock *smc;
 849
 850         read_lock_bh(&clcsk->sk_callback_lock);
 851         smc = smc_clcsock_user_data(clcsk);
 852         if (smc)
 853                 smc_fback_forward_wakeup(smc, clcsk,
 854                                          smc->clcsk_write_space);
 855         read_unlock_bh(&clcsk->sk_callback_lock);
 856 }
 857
 858 static void smc_fback_error_report(struct sock *clcsk)
 859 {
 860         struct smc_sock *smc;
 861
 862         read_lock_bh(&clcsk->sk_callback_lock);
 863         smc = smc_clcsock_user_data(clcsk);
 864         if (smc)
 865                 smc_fback_forward_wakeup(smc, clcsk,
 866                                          smc->clcsk_error_report);
 867         read_unlock_bh(&clcsk->sk_callback_lock);
 868 }
 869
 870 static void smc_fback_replace_callbacks(struct smc_sock *smc)
 871 {
 872         struct sock *clcsk = smc->clcsock->sk;
 873
 874         write_lock_bh(&clcsk->sk_callback_lock);
 875         clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
 876
 877         smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
 878                                &smc->clcsk_state_change);
 879         smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
 880                                &smc->clcsk_data_ready);
 881         smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
 882                                &smc->clcsk_write_space);
 883         smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
 884                                &smc->clcsk_error_report);
 885
 886         write_unlock_bh(&clcsk->sk_callback_lock);
 887 }
 888
 889 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
 890 {
 891         int rc = 0;
 892
 893         mutex_lock(&smc->clcsock_release_lock);
 894         if (!smc->clcsock) {
 895                 rc = -EBADF;
 896                 goto out;
 897         }
 898
 899         smc->use_fallback = true;
 900         smc->fallback_rsn = reason_code;
 901         smc_stat_fallback(smc);
 902         trace_smc_switch_to_fallback(smc, reason_code);
 903         if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
 904                 smc->clcsock->file = smc->sk.sk_socket->file;
 905                 smc->clcsock->file->private_data = smc->clcsock;
 906                 smc->clcsock->wq.fasync_list =
 907                         smc->sk.sk_socket->wq.fasync_list;
 908                 smc->sk.sk_socket->wq.fasync_list = NULL;
 909
 910                 /* There might be some wait entries remaining
 911                  * in smc sk->sk_wq and they should be woken up
 912                  * as clcsock's wait queue is woken up.
 913                  */
 914                 smc_fback_replace_callbacks(smc);
 915         }
 916 out:
 917         mutex_unlock(&smc->clcsock_release_lock);
 918         return rc;
 919 }
 920
 921 /* fall back during connect */
 922 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 923 {
 924         struct net *net = sock_net(&smc->sk);
 925         int rc = 0;
 926
 927         rc = smc_switch_to_fallback(smc, reason_code);
 928         if (rc) { /* fallback fails */
 929                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 930                 if (smc->sk.sk_state == SMC_INIT)
 931                         sock_put(&smc->sk); /* passive closing */
 932                 return rc;
 933         }
 934         smc_copy_sock_settings_to_clc(smc);
 935         smc->connect_nonblock = 0;
 936         if (smc->sk.sk_state == SMC_INIT)
 937                 smc->sk.sk_state = SMC_ACTIVE;
 938         return 0;
 939 }
 940
 941 /* decline and fall back during connect */
 942 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 943                                         u8 version)
 944 {
 945         struct net *net = sock_net(&smc->sk);
 946         int rc;
 947
 948         if (reason_code < 0) { /* error, fallback is not possible */
 949                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 950                 if (smc->sk.sk_state == SMC_INIT)
 951                         sock_put(&smc->sk); /* passive closing */
 952                 return reason_code;
 953         }
 954         if (reason_code != SMC_CLC_DECL_PEERDECL) {
 955                 rc = smc_clc_send_decline(smc, reason_code, version);
 956                 if (rc < 0) {
 957                         this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 958                         if (smc->sk.sk_state == SMC_INIT)
 959                                 sock_put(&smc->sk); /* passive closing */
 960                         return rc;
 961                 }
 962         }
 963         return smc_connect_fallback(smc, reason_code);
 964 }
 965
 966 static void smc_conn_abort(struct smc_sock *smc, int local_first)
 967 {
 968         struct smc_connection *conn = &smc->conn;
 969         struct smc_link_group *lgr = conn->lgr;
 970         bool lgr_valid = false;
 971
 972         if (smc_conn_lgr_valid(conn))
 973                 lgr_valid = true;
 974
 975         smc_conn_free(conn);
 976         if (local_first && lgr_valid)
 977                 smc_lgr_cleanup_early(lgr);
 978 }
 979
 980 /* check if there is a rdma device available for this connection. */
 981 /* called for connect and listen */
 982 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
 983 {
 984         /* PNET table look up: search active ib_device and port
 985          * within same PNETID that also contains the ethernet device
 986          * used for the internal TCP socket
 987          */
 988         smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
 989         if (!ini->check_smcrv2 && !ini->ib_dev)
 990                 return SMC_CLC_DECL_NOSMCRDEV;
 991         if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
 992                 return SMC_CLC_DECL_NOSMCRDEV;
 993         return 0;
 994 }
 995
 996 /* check if there is an ISM device available for this connection. */
 997 /* called for connect and listen */
 998 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
 999 {
1000         /* Find ISM device with same PNETID as connecting interface  */
1001         smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
1002         if (!ini->ism_dev[0])
1003                 return SMC_CLC_DECL_NOSMCDDEV;
1004         else
1005                 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
1006         return 0;
1007 }
1008
1009 /* is chid unique for the ism devices that are already determined? */
1010 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
1011                                            int cnt)
1012 {
1013         int i = (!ini->ism_dev[0]) ? 1 : 0;
1014
1015         for (; i < cnt; i++)
1016                 if (ini->ism_chid[i] == chid)
1017                         return false;
1018         return true;
1019 }
1020
1021 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
1022  * PNETID matching net_device)
1023  */
1024 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
1025                                        struct smc_init_info *ini)
1026 {
1027         int rc = SMC_CLC_DECL_NOSMCDDEV;
1028         struct smcd_dev *smcd;
1029         int i = 1, entry = 1;
1030         bool is_emulated;
1031         u16 chid;
1032
1033         if (smcd_indicated(ini->smc_type_v1))
1034                 rc = 0;         /* already initialized for V1 */
1035         mutex_lock(&smcd_dev_list.mutex);
1036         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1037                 if (smcd->going_away || smcd == ini->ism_dev[0])
1038                         continue;
1039                 chid = smc_ism_get_chid(smcd);
1040                 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
1041                         continue;
1042                 is_emulated = __smc_ism_is_emulated(chid);
1043                 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
1044                     smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
1045                         if (is_emulated && entry == SMCD_CLC_MAX_V2_GID_ENTRIES)
1046                                 /* It's the last GID-CHID entry left in CLC
1047                                  * Proposal SMC-Dv2 extension, but an Emulated-
1048                                  * ISM device will take two entries. So give
1049                                  * up it and try the next potential ISM device.
1050                                  */
1051                                 continue;
1052                         ini->ism_dev[i] = smcd;
1053                         ini->ism_chid[i] = chid;
1054                         ini->is_smcd = true;
1055                         rc = 0;
1056                         i++;
1057                         entry = is_emulated ? entry + 2 : entry + 1;
1058                         if (entry > SMCD_CLC_MAX_V2_GID_ENTRIES)
1059                                 break;
1060                 }
1061         }
1062         mutex_unlock(&smcd_dev_list.mutex);
1063         ini->ism_offered_cnt = i - 1;
1064         if (!ini->ism_dev[0] && !ini->ism_dev[1])
1065                 ini->smcd_version = 0;
1066
1067         return rc;
1068 }
1069
1070 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
1071 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
1072                                       struct smc_init_info *ini)
1073 {
1074         if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
1075                 return SMC_CLC_DECL_ISMVLANERR;
1076         return 0;
1077 }
1078
1079 static int smc_find_proposal_devices(struct smc_sock *smc,
1080                                      struct smc_init_info *ini)
1081 {
1082         int rc = 0;
1083
1084         /* check if there is an ism device available */
1085         if (!(ini->smcd_version & SMC_V1) ||
1086             smc_find_ism_device(smc, ini) ||
1087             smc_connect_ism_vlan_setup(smc, ini))
1088                 ini->smcd_version &= ~SMC_V1;
1089         /* else ISM V1 is supported for this connection */
1090
1091         /* check if there is an rdma device available */
1092         if (!(ini->smcr_version & SMC_V1) ||
1093             smc_find_rdma_device(smc, ini))
1094                 ini->smcr_version &= ~SMC_V1;
1095         /* else RDMA is supported for this connection */
1096
1097         ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1098                                               ini->smcr_version & SMC_V1);
1099
1100         /* check if there is an ism v2 device available */
1101         if (!(ini->smcd_version & SMC_V2) ||
1102             !smc_ism_is_v2_capable() ||
1103             smc_find_ism_v2_device_clnt(smc, ini))
1104                 ini->smcd_version &= ~SMC_V2;
1105
1106         /* check if there is an rdma v2 device available */
1107         ini->check_smcrv2 = true;
1108         ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1109         if (!(ini->smcr_version & SMC_V2) ||
1110             smc->clcsock->sk->sk_family != AF_INET ||
1111             !smc_clc_ueid_count() ||
1112             smc_find_rdma_device(smc, ini))
1113                 ini->smcr_version &= ~SMC_V2;
1114         ini->check_smcrv2 = false;
1115
1116         ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1117                                               ini->smcr_version & SMC_V2);
1118
1119         /* if neither ISM nor RDMA are supported, fallback */
1120         if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
1121                 rc = SMC_CLC_DECL_NOSMCDEV;
1122
1123         return rc;
1124 }
1125
1126 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1127  * used, the VLAN ID will be registered again during the connection setup.
1128  */
1129 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
1130                                         struct smc_init_info *ini)
1131 {
1132         if (!smcd_indicated(ini->smc_type_v1))
1133                 return 0;
1134         if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
1135                 return SMC_CLC_DECL_CNFERR;
1136         return 0;
1137 }
1138
1139 #define SMC_CLC_MAX_ACCEPT_LEN \
1140         (sizeof(struct smc_clc_msg_accept_confirm) + \
1141          sizeof(struct smc_clc_first_contact_ext_v2x) + \
1142          sizeof(struct smc_clc_msg_trail))
1143
1144 /* CLC handshake during connect */
1145 static int smc_connect_clc(struct smc_sock *smc,
1146                            struct smc_clc_msg_accept_confirm *aclc,
1147                            struct smc_init_info *ini)
1148 {
1149         int rc = 0;
1150
1151         /* do inband token exchange */
1152         rc = smc_clc_send_proposal(smc, ini);
1153         if (rc)
1154                 return rc;
1155         /* receive SMC Accept CLC message */
1156         return smc_clc_wait_msg(smc, aclc, SMC_CLC_MAX_ACCEPT_LEN,
1157                                 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
1158 }
1159
1160 void smc_fill_gid_list(struct smc_link_group *lgr,
1161                        struct smc_gidlist *gidlist,
1162                        struct smc_ib_device *known_dev, u8 *known_gid)
1163 {
1164         struct smc_init_info *alt_ini = NULL;
1165
1166         memset(gidlist, 0, sizeof(*gidlist));
1167         memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1168
1169         alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1170         if (!alt_ini)
1171                 goto out;
1172
1173         alt_ini->vlan_id = lgr->vlan_id;
1174         alt_ini->check_smcrv2 = true;
1175         alt_ini->smcrv2.saddr = lgr->saddr;
1176         smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1177
1178         if (!alt_ini->smcrv2.ib_dev_v2)
1179                 goto out;
1180
1181         memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1182                SMC_GID_SIZE);
1183
1184 out:
1185         kfree(alt_ini);
1186 }
1187
1188 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1189                                        struct smc_clc_msg_accept_confirm *aclc,
1190                                        struct smc_init_info *ini)
1191 {
1192         struct smc_clc_first_contact_ext *fce =
1193                 smc_get_clc_first_contact_ext(aclc, false);
1194         struct net *net = sock_net(&smc->sk);
1195         int rc;
1196
1197         if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1198                 return 0;
1199
1200         if (fce->v2_direct) {
1201                 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1202                 ini->smcrv2.uses_gateway = false;
1203         } else {
1204                 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr,
1205                                       smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1206                                       ini->smcrv2.nexthop_mac,
1207                                       &ini->smcrv2.uses_gateway))
1208                         return SMC_CLC_DECL_NOROUTE;
1209                 if (!ini->smcrv2.uses_gateway) {
1210                         /* mismatch: peer claims indirect, but its direct */
1211                         return SMC_CLC_DECL_NOINDIRECT;
1212                 }
1213         }
1214
1215         ini->release_nr = fce->release;
1216         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1217         if (rc)
1218                 return rc;
1219
1220         return 0;
1221 }
1222
1223 /* setup for RDMA connection of client */
1224 static int smc_connect_rdma(struct smc_sock *smc,
1225                             struct smc_clc_msg_accept_confirm *aclc,
1226                             struct smc_init_info *ini)
1227 {
1228         int i, reason_code = 0;
1229         struct smc_link *link;
1230         u8 *eid = NULL;
1231
1232         ini->is_smcd = false;
1233         ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
1234         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1235         memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1236         memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1237         memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
1238         ini->max_conns = SMC_CONN_PER_LGR_MAX;
1239         ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1240
1241         reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1242         if (reason_code)
1243                 return reason_code;
1244
1245         mutex_lock(&smc_client_lgr_pending);
1246         reason_code = smc_conn_create(smc, ini);
1247         if (reason_code) {
1248                 mutex_unlock(&smc_client_lgr_pending);
1249                 return reason_code;
1250         }
1251
1252         smc_conn_save_peer_info(smc, aclc);
1253
1254         if (ini->first_contact_local) {
1255                 link = smc->conn.lnk;
1256         } else {
1257                 /* set link that was assigned by server */
1258                 link = NULL;
1259                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1260                         struct smc_link *l = &smc->conn.lgr->lnk[i];
1261
1262                         if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1263                             !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1264                                     SMC_GID_SIZE) &&
1265                             (aclc->hdr.version > SMC_V1 ||
1266                              !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1267                                      sizeof(l->peer_mac)))) {
1268                                 link = l;
1269                                 break;
1270                         }
1271                 }
1272                 if (!link) {
1273                         reason_code = SMC_CLC_DECL_NOSRVLINK;
1274                         goto connect_abort;
1275                 }
1276                 smc_switch_link_and_count(&smc->conn, link);
1277         }
1278
1279         /* create send buffer and rmb */
1280         if (smc_buf_create(smc, false)) {
1281                 reason_code = SMC_CLC_DECL_MEM;
1282                 goto connect_abort;
1283         }
1284
1285         if (ini->first_contact_local)
1286                 smc_link_save_peer_info(link, aclc, ini);
1287
1288         if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1289                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1290                 goto connect_abort;
1291         }
1292
1293         smc_close_init(smc);
1294         smc_rx_init(smc);
1295
1296         if (ini->first_contact_local) {
1297                 if (smc_ib_ready_link(link)) {
1298                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1299                         goto connect_abort;
1300                 }
1301         } else {
1302                 /* reg sendbufs if they were vzalloced */
1303                 if (smc->conn.sndbuf_desc->is_vm) {
1304                         if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) {
1305                                 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1306                                 goto connect_abort;
1307                         }
1308                 }
1309                 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
1310                         reason_code = SMC_CLC_DECL_ERR_REGBUF;
1311                         goto connect_abort;
1312                 }
1313         }
1314
1315         if (aclc->hdr.version > SMC_V1) {
1316                 eid = aclc->r1.eid;
1317                 if (ini->first_contact_local)
1318                         smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1319                                           link->smcibdev, link->gid);
1320         }
1321
1322         reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
1323                                            aclc->hdr.version, eid, ini);
1324         if (reason_code)
1325                 goto connect_abort;
1326
1327         smc_tx_init(smc);
1328
1329         if (ini->first_contact_local) {
1330                 /* QP confirmation over RoCE fabric */
1331                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1332                 reason_code = smcr_clnt_conf_first_link(smc);
1333                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1334                 if (reason_code)
1335                         goto connect_abort;
1336         }
1337         mutex_unlock(&smc_client_lgr_pending);
1338
1339         smc_copy_sock_settings_to_clc(smc);
1340         smc->connect_nonblock = 0;
1341         if (smc->sk.sk_state == SMC_INIT)
1342                 smc->sk.sk_state = SMC_ACTIVE;
1343
1344         return 0;
1345 connect_abort:
1346         smc_conn_abort(smc, ini->first_contact_local);
1347         mutex_unlock(&smc_client_lgr_pending);
1348         smc->connect_nonblock = 0;
1349
1350         return reason_code;
1351 }
1352
1353 /* The server has chosen one of the proposed ISM devices for the communication.
1354  * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1355  */
1356 static int
1357 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm *aclc,
1358                                struct smc_init_info *ini)
1359 {
1360         int i;
1361
1362         for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
1363                 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
1364                         ini->ism_selected = i;
1365                         return 0;
1366                 }
1367         }
1368
1369         return -EPROTO;
1370 }
1371
1372 /* setup for ISM connection of client */
1373 static int smc_connect_ism(struct smc_sock *smc,
1374                            struct smc_clc_msg_accept_confirm *aclc,
1375                            struct smc_init_info *ini)
1376 {
1377         u8 *eid = NULL;
1378         int rc = 0;
1379
1380         ini->is_smcd = true;
1381         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1382
1383         if (aclc->hdr.version == SMC_V2) {
1384                 if (ini->first_contact_peer) {
1385                         struct smc_clc_first_contact_ext *fce =
1386                                 smc_get_clc_first_contact_ext(aclc, true);
1387
1388                         ini->release_nr = fce->release;
1389                         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1390                         if (rc)
1391                                 return rc;
1392                 }
1393
1394                 rc = smc_v2_determine_accepted_chid(aclc, ini);
1395                 if (rc)
1396                         return rc;
1397
1398                 if (__smc_ism_is_emulated(ini->ism_chid[ini->ism_selected]))
1399                         ini->ism_peer_gid[ini->ism_selected].gid_ext =
1400                                                 ntohll(aclc->d1.gid_ext);
1401                 /* for non-Emulated-ISM devices, peer gid_ext remains 0. */
1402         }
1403         ini->ism_peer_gid[ini->ism_selected].gid = ntohll(aclc->d0.gid);
1404
1405         /* there is only one lgr role for SMC-D; use server lock */
1406         mutex_lock(&smc_server_lgr_pending);
1407         rc = smc_conn_create(smc, ini);
1408         if (rc) {
1409                 mutex_unlock(&smc_server_lgr_pending);
1410                 return rc;
1411         }
1412
1413         /* Create send and receive buffers */
1414         rc = smc_buf_create(smc, true);
1415         if (rc) {
1416                 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1417                 goto connect_abort;
1418         }
1419
1420         smc_conn_save_peer_info(smc, aclc);
1421
1422         if (smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) {
1423                 rc = smcd_buf_attach(smc);
1424                 if (rc) {
1425                         rc = SMC_CLC_DECL_MEM;  /* try to fallback */
1426                         goto connect_abort;
1427                 }
1428         }
1429         smc_close_init(smc);
1430         smc_rx_init(smc);
1431         smc_tx_init(smc);
1432
1433         if (aclc->hdr.version > SMC_V1)
1434                 eid = aclc->d1.eid;
1435
1436         rc = smc_clc_send_confirm(smc, ini->first_contact_local,
1437                                   aclc->hdr.version, eid, ini);
1438         if (rc)
1439                 goto connect_abort;
1440         mutex_unlock(&smc_server_lgr_pending);
1441
1442         smc_copy_sock_settings_to_clc(smc);
1443         smc->connect_nonblock = 0;
1444         if (smc->sk.sk_state == SMC_INIT)
1445                 smc->sk.sk_state = SMC_ACTIVE;
1446
1447         return 0;
1448 connect_abort:
1449         smc_conn_abort(smc, ini->first_contact_local);
1450         mutex_unlock(&smc_server_lgr_pending);
1451         smc->connect_nonblock = 0;
1452
1453         return rc;
1454 }
1455
1456 /* check if received accept type and version matches a proposed one */
1457 static int smc_connect_check_aclc(struct smc_init_info *ini,
1458                                   struct smc_clc_msg_accept_confirm *aclc)
1459 {
1460         if (aclc->hdr.typev1 != SMC_TYPE_R &&
1461             aclc->hdr.typev1 != SMC_TYPE_D)
1462                 return SMC_CLC_DECL_MODEUNSUPP;
1463
1464         if (aclc->hdr.version >= SMC_V2) {
1465                 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1466                      !smcr_indicated(ini->smc_type_v2)) ||
1467                     (aclc->hdr.typev1 == SMC_TYPE_D &&
1468                      !smcd_indicated(ini->smc_type_v2)))
1469                         return SMC_CLC_DECL_MODEUNSUPP;
1470         } else {
1471                 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1472                      !smcr_indicated(ini->smc_type_v1)) ||
1473                     (aclc->hdr.typev1 == SMC_TYPE_D &&
1474                      !smcd_indicated(ini->smc_type_v1)))
1475                         return SMC_CLC_DECL_MODEUNSUPP;
1476         }
1477
1478         return 0;
1479 }
1480
1481 /* perform steps before actually connecting */
1482 static int __smc_connect(struct smc_sock *smc)
1483 {
1484         u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1485         struct smc_clc_msg_accept_confirm *aclc;
1486         struct smc_init_info *ini = NULL;
1487         u8 *buf = NULL;
1488         int rc = 0;
1489
1490         if (smc->use_fallback)
1491                 return smc_connect_fallback(smc, smc->fallback_rsn);
1492
1493         /* if peer has not signalled SMC-capability, fall back */
1494         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
1495                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
1496
1497         /* IPSec connections opt out of SMC optimizations */
1498         if (using_ipsec(smc))
1499                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1500                                                     version);
1501
1502         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1503         if (!ini)
1504                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1505                                                     version);
1506
1507         ini->smcd_version = SMC_V1 | SMC_V2;
1508         ini->smcr_version = SMC_V1 | SMC_V2;
1509         ini->smc_type_v1 = SMC_TYPE_B;
1510         ini->smc_type_v2 = SMC_TYPE_B;
1511
1512         /* get vlan id from IP device */
1513         if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
1514                 ini->smcd_version &= ~SMC_V1;
1515                 ini->smcr_version = 0;
1516                 ini->smc_type_v1 = SMC_TYPE_N;
1517                 if (!ini->smcd_version) {
1518                         rc = SMC_CLC_DECL_GETVLANERR;
1519                         goto fallback;
1520                 }
1521         }
1522
1523         rc = smc_find_proposal_devices(smc, ini);
1524         if (rc)
1525                 goto fallback;
1526
1527         buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1528         if (!buf) {
1529                 rc = SMC_CLC_DECL_MEM;
1530                 goto fallback;
1531         }
1532         aclc = (struct smc_clc_msg_accept_confirm *)buf;
1533
1534         /* perform CLC handshake */
1535         rc = smc_connect_clc(smc, aclc, ini);
1536         if (rc) {
1537                 /* -EAGAIN on timeout, see tcp_recvmsg() */
1538                 if (rc == -EAGAIN) {
1539                         rc = -ETIMEDOUT;
1540                         smc->sk.sk_err = ETIMEDOUT;
1541                 }
1542                 goto vlan_cleanup;
1543         }
1544
1545         /* check if smc modes and versions of CLC proposal and accept match */
1546         rc = smc_connect_check_aclc(ini, aclc);
1547         version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1548         if (rc)
1549                 goto vlan_cleanup;
1550
1551         /* depending on previous steps, connect using rdma or ism */
1552         if (aclc->hdr.typev1 == SMC_TYPE_R) {
1553                 ini->smcr_version = version;
1554                 rc = smc_connect_rdma(smc, aclc, ini);
1555         } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1556                 ini->smcd_version = version;
1557                 rc = smc_connect_ism(smc, aclc, ini);
1558         }
1559         if (rc)
1560                 goto vlan_cleanup;
1561
1562         SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1563         smc_connect_ism_vlan_cleanup(smc, ini);
1564         kfree(buf);
1565         kfree(ini);
1566         return 0;
1567
1568 vlan_cleanup:
1569         smc_connect_ism_vlan_cleanup(smc, ini);
1570         kfree(buf);
1571 fallback:
1572         kfree(ini);
1573         return smc_connect_decline_fallback(smc, rc, version);
1574 }
1575
1576 static void smc_connect_work(struct work_struct *work)
1577 {
1578         struct smc_sock *smc = container_of(work, struct smc_sock,
1579                                             connect_work);
1580         long timeo = smc->sk.sk_sndtimeo;
1581         int rc = 0;
1582
1583         if (!timeo)
1584                 timeo = MAX_SCHEDULE_TIMEOUT;
1585         lock_sock(smc->clcsock->sk);
1586         if (smc->clcsock->sk->sk_err) {
1587                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1588         } else if ((1 << smc->clcsock->sk->sk_state) &
1589                                         (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1590                 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1591                 if ((rc == -EPIPE) &&
1592                     ((1 << smc->clcsock->sk->sk_state) &
1593                                         (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1594                         rc = 0;
1595         }
1596         release_sock(smc->clcsock->sk);
1597         lock_sock(&smc->sk);
1598         if (rc != 0 || smc->sk.sk_err) {
1599                 smc->sk.sk_state = SMC_CLOSED;
1600                 if (rc == -EPIPE || rc == -EAGAIN)
1601                         smc->sk.sk_err = EPIPE;
1602                 else if (rc == -ECONNREFUSED)
1603                         smc->sk.sk_err = ECONNREFUSED;
1604                 else if (signal_pending(current))
1605                         smc->sk.sk_err = -sock_intr_errno(timeo);
1606                 sock_put(&smc->sk); /* passive closing */
1607                 goto out;
1608         }
1609
1610         rc = __smc_connect(smc);
1611         if (rc < 0)
1612                 smc->sk.sk_err = -rc;
1613
1614 out:
1615         if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1616                 if (smc->sk.sk_err) {
1617                         smc->sk.sk_state_change(&smc->sk);
1618                 } else { /* allow polling before and after fallback decision */
1619                         smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1620                         smc->sk.sk_write_space(&smc->sk);
1621                 }
1622         }
1623         release_sock(&smc->sk);
1624 }
1625
1626 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1627                        int alen, int flags)
1628 {
1629         struct sock *sk = sock->sk;
1630         struct smc_sock *smc;
1631         int rc = -EINVAL;
1632
1633         smc = smc_sk(sk);
1634
1635         /* separate smc parameter checking to be safe */
1636         if (alen < sizeof(addr->sa_family))
1637                 goto out_err;
1638         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1639                 goto out_err;
1640
1641         lock_sock(sk);
1642         switch (sock->state) {
1643         default:
1644                 rc = -EINVAL;
1645                 goto out;
1646         case SS_CONNECTED:
1647                 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1648                 goto out;
1649         case SS_CONNECTING:
1650                 if (sk->sk_state == SMC_ACTIVE)
1651                         goto connected;
1652                 break;
1653         case SS_UNCONNECTED:
1654                 sock->state = SS_CONNECTING;
1655                 break;
1656         }
1657
1658         switch (sk->sk_state) {
1659         default:
1660                 goto out;
1661         case SMC_CLOSED:
1662                 rc = sock_error(sk) ? : -ECONNABORTED;
1663                 sock->state = SS_UNCONNECTED;
1664                 goto out;
1665         case SMC_ACTIVE:
1666                 rc = -EISCONN;
1667                 goto out;
1668         case SMC_INIT:
1669                 break;
1670         }
1671
1672         smc_copy_sock_settings_to_clc(smc);
1673         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1674         if (smc->connect_nonblock) {
1675                 rc = -EALREADY;
1676                 goto out;
1677         }
1678         rc = kernel_connect(smc->clcsock, addr, alen, flags);
1679         if (rc && rc != -EINPROGRESS)
1680                 goto out;
1681
1682         if (smc->use_fallback) {
1683                 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
1684                 goto out;
1685         }
1686         sock_hold(&smc->sk); /* sock put in passive closing */
1687         if (flags & O_NONBLOCK) {
1688                 if (queue_work(smc_hs_wq, &smc->connect_work))
1689                         smc->connect_nonblock = 1;
1690                 rc = -EINPROGRESS;
1691                 goto out;
1692         } else {
1693                 rc = __smc_connect(smc);
1694                 if (rc < 0)
1695                         goto out;
1696         }
1697
1698 connected:
1699         rc = 0;
1700         sock->state = SS_CONNECTED;
1701 out:
1702         release_sock(sk);
1703 out_err:
1704         return rc;
1705 }
1706
1707 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1708 {
1709         struct socket *new_clcsock = NULL;
1710         struct sock *lsk = &lsmc->sk;
1711         struct sock *new_sk;
1712         int rc = -EINVAL;
1713
1714         release_sock(lsk);
1715         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1716         if (!new_sk) {
1717                 rc = -ENOMEM;
1718                 lsk->sk_err = ENOMEM;
1719                 *new_smc = NULL;
1720                 lock_sock(lsk);
1721                 goto out;
1722         }
1723         *new_smc = smc_sk(new_sk);
1724
1725         mutex_lock(&lsmc->clcsock_release_lock);
1726         if (lsmc->clcsock)
1727                 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1728         mutex_unlock(&lsmc->clcsock_release_lock);
1729         lock_sock(lsk);
1730         if  (rc < 0 && rc != -EAGAIN)
1731                 lsk->sk_err = -rc;
1732         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1733                 new_sk->sk_prot->unhash(new_sk);
1734                 if (new_clcsock)
1735                         sock_release(new_clcsock);
1736                 new_sk->sk_state = SMC_CLOSED;
1737                 smc_sock_set_flag(new_sk, SOCK_DEAD);
1738                 sock_put(new_sk); /* final */
1739                 *new_smc = NULL;
1740                 goto out;
1741         }
1742
1743         /* new clcsock has inherited the smc listen-specific sk_data_ready
1744          * function; switch it back to the original sk_data_ready function
1745          */
1746         new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1747
1748         /* if new clcsock has also inherited the fallback-specific callback
1749          * functions, switch them back to the original ones.
1750          */
1751         if (lsmc->use_fallback) {
1752                 if (lsmc->clcsk_state_change)
1753                         new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1754                 if (lsmc->clcsk_write_space)
1755                         new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1756                 if (lsmc->clcsk_error_report)
1757                         new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1758         }
1759
1760         (*new_smc)->clcsock = new_clcsock;
1761 out:
1762         return rc;
1763 }
1764
1765 /* add a just created sock to the accept queue of the listen sock as
1766  * candidate for a following socket accept call from user space
1767  */
1768 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1769 {
1770         struct smc_sock *par = smc_sk(parent);
1771
1772         sock_hold(sk); /* sock_put in smc_accept_unlink () */
1773         spin_lock(&par->accept_q_lock);
1774         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1775         spin_unlock(&par->accept_q_lock);
1776         sk_acceptq_added(parent);
1777 }
1778
1779 /* remove a socket from the accept queue of its parental listening socket */
1780 static void smc_accept_unlink(struct sock *sk)
1781 {
1782         struct smc_sock *par = smc_sk(sk)->listen_smc;
1783
1784         spin_lock(&par->accept_q_lock);
1785         list_del_init(&smc_sk(sk)->accept_q);
1786         spin_unlock(&par->accept_q_lock);
1787         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1788         sock_put(sk); /* sock_hold in smc_accept_enqueue */
1789 }
1790
1791 /* remove a sock from the accept queue to bind it to a new socket created
1792  * for a socket accept call from user space
1793  */
1794 struct sock *smc_accept_dequeue(struct sock *parent,
1795                                 struct socket *new_sock)
1796 {
1797         struct smc_sock *isk, *n;
1798         struct sock *new_sk;
1799
1800         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1801                 new_sk = (struct sock *)isk;
1802
1803                 smc_accept_unlink(new_sk);
1804                 if (new_sk->sk_state == SMC_CLOSED) {
1805                         new_sk->sk_prot->unhash(new_sk);
1806                         if (isk->clcsock) {
1807                                 sock_release(isk->clcsock);
1808                                 isk->clcsock = NULL;
1809                         }
1810                         sock_put(new_sk); /* final */
1811                         continue;
1812                 }
1813                 if (new_sock) {
1814                         sock_graft(new_sk, new_sock);
1815                         new_sock->state = SS_CONNECTED;
1816                         if (isk->use_fallback) {
1817                                 smc_sk(new_sk)->clcsock->file = new_sock->file;
1818                                 isk->clcsock->file->private_data = isk->clcsock;
1819                         }
1820                 }
1821                 return new_sk;
1822         }
1823         return NULL;
1824 }
1825
1826 /* clean up for a created but never accepted sock */
1827 void smc_close_non_accepted(struct sock *sk)
1828 {
1829         struct smc_sock *smc = smc_sk(sk);
1830
1831         sock_hold(sk); /* sock_put below */
1832         lock_sock(sk);
1833         if (!sk->sk_lingertime)
1834                 /* wait for peer closing */
1835                 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);
1836         __smc_release(smc);
1837         release_sock(sk);
1838         sock_put(sk); /* sock_hold above */
1839         sock_put(sk); /* final sock_put */
1840 }
1841
1842 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1843 {
1844         struct smc_link *link = smc->conn.lnk;
1845         struct smc_llc_qentry *qentry;
1846         int rc;
1847
1848         /* reg the sndbuf if it was vzalloced*/
1849         if (smc->conn.sndbuf_desc->is_vm) {
1850                 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
1851                         return SMC_CLC_DECL_ERR_REGBUF;
1852         }
1853
1854         /* reg the rmb */
1855         if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
1856                 return SMC_CLC_DECL_ERR_REGBUF;
1857
1858         /* send CONFIRM LINK request to client over the RoCE fabric */
1859         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1860         if (rc < 0)
1861                 return SMC_CLC_DECL_TIMEOUT_CL;
1862
1863         /* receive CONFIRM LINK response from client over the RoCE fabric */
1864         qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1865                               SMC_LLC_CONFIRM_LINK);
1866         if (!qentry) {
1867                 struct smc_clc_msg_decline dclc;
1868
1869                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1870                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1871                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1872         }
1873         smc_llc_save_peer_uid(qentry);
1874         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1875         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1876         if (rc)
1877                 return SMC_CLC_DECL_RMBE_EC;
1878
1879         /* confirm_rkey is implicit on 1st contact */
1880         smc->conn.rmb_desc->is_conf_rkey = true;
1881
1882         smc_llc_link_active(link);
1883         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1884
1885         if (link->lgr->max_links > 1) {
1886                 down_write(&link->lgr->llc_conf_mutex);
1887                 /* initial contact - try to establish second link */
1888                 smc_llc_srv_add_link(link, NULL);
1889                 up_write(&link->lgr->llc_conf_mutex);
1890         }
1891         return 0;
1892 }
1893
1894 /* listen worker: finish */
1895 static void smc_listen_out(struct smc_sock *new_smc)
1896 {
1897         struct smc_sock *lsmc = new_smc->listen_smc;
1898         struct sock *newsmcsk = &new_smc->sk;
1899
1900         if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1901                 atomic_dec(&lsmc->queued_smc_hs);
1902
1903         if (lsmc->sk.sk_state == SMC_LISTEN) {
1904                 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1905                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1906                 release_sock(&lsmc->sk);
1907         } else { /* no longer listening */
1908                 smc_close_non_accepted(newsmcsk);
1909         }
1910
1911         /* Wake up accept */
1912         lsmc->sk.sk_data_ready(&lsmc->sk);
1913         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1914 }
1915
1916 /* listen worker: finish in state connected */
1917 static void smc_listen_out_connected(struct smc_sock *new_smc)
1918 {
1919         struct sock *newsmcsk = &new_smc->sk;
1920
1921         if (newsmcsk->sk_state == SMC_INIT)
1922                 newsmcsk->sk_state = SMC_ACTIVE;
1923
1924         smc_listen_out(new_smc);
1925 }
1926
1927 /* listen worker: finish in error state */
1928 static void smc_listen_out_err(struct smc_sock *new_smc)
1929 {
1930         struct sock *newsmcsk = &new_smc->sk;
1931         struct net *net = sock_net(newsmcsk);
1932
1933         this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1934         if (newsmcsk->sk_state == SMC_INIT)
1935                 sock_put(&new_smc->sk); /* passive closing */
1936         newsmcsk->sk_state = SMC_CLOSED;
1937
1938         smc_listen_out(new_smc);
1939 }
1940
1941 /* listen worker: decline and fall back if possible */
1942 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1943                                int local_first, u8 version)
1944 {
1945         /* RDMA setup failed, switch back to TCP */
1946         smc_conn_abort(new_smc, local_first);
1947         if (reason_code < 0 ||
1948             smc_switch_to_fallback(new_smc, reason_code)) {
1949                 /* error, no fallback possible */
1950                 smc_listen_out_err(new_smc);
1951                 return;
1952         }
1953         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1954                 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1955                         smc_listen_out_err(new_smc);
1956                         return;
1957                 }
1958         }
1959         smc_listen_out_connected(new_smc);
1960 }
1961
1962 /* listen worker: version checking */
1963 static int smc_listen_v2_check(struct smc_sock *new_smc,
1964                                struct smc_clc_msg_proposal *pclc,
1965                                struct smc_init_info *ini)
1966 {
1967         struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1968         struct smc_clc_v2_extension *pclc_v2_ext;
1969         int rc = SMC_CLC_DECL_PEERNOSMC;
1970
1971         ini->smc_type_v1 = pclc->hdr.typev1;
1972         ini->smc_type_v2 = pclc->hdr.typev2;
1973         ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1974         ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1975         if (pclc->hdr.version > SMC_V1) {
1976                 if (smcd_indicated(ini->smc_type_v2))
1977                         ini->smcd_version |= SMC_V2;
1978                 if (smcr_indicated(ini->smc_type_v2))
1979                         ini->smcr_version |= SMC_V2;
1980         }
1981         if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1982                 rc = SMC_CLC_DECL_PEERNOSMC;
1983                 goto out;
1984         }
1985         pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1986         if (!pclc_v2_ext) {
1987                 ini->smcd_version &= ~SMC_V2;
1988                 ini->smcr_version &= ~SMC_V2;
1989                 rc = SMC_CLC_DECL_NOV2EXT;
1990                 goto out;
1991         }
1992         pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
1993         if (ini->smcd_version & SMC_V2) {
1994                 if (!smc_ism_is_v2_capable()) {
1995                         ini->smcd_version &= ~SMC_V2;
1996                         rc = SMC_CLC_DECL_NOISM2SUPP;
1997                 } else if (!pclc_smcd_v2_ext) {
1998                         ini->smcd_version &= ~SMC_V2;
1999                         rc = SMC_CLC_DECL_NOV2DEXT;
2000                 } else if (!pclc_v2_ext->hdr.eid_cnt &&
2001                            !pclc_v2_ext->hdr.flag.seid) {
2002                         ini->smcd_version &= ~SMC_V2;
2003                         rc = SMC_CLC_DECL_NOUEID;
2004                 }
2005         }
2006         if (ini->smcr_version & SMC_V2) {
2007                 if (!pclc_v2_ext->hdr.eid_cnt) {
2008                         ini->smcr_version &= ~SMC_V2;
2009                         rc = SMC_CLC_DECL_NOUEID;
2010                 }
2011         }
2012
2013         ini->release_nr = pclc_v2_ext->hdr.flag.release;
2014         if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
2015                 ini->release_nr = SMC_RELEASE;
2016
2017 out:
2018         if (!ini->smcd_version && !ini->smcr_version)
2019                 return rc;
2020
2021         return 0;
2022 }
2023
2024 /* listen worker: check prefixes */
2025 static int smc_listen_prfx_check(struct smc_sock *new_smc,
2026                                  struct smc_clc_msg_proposal *pclc)
2027 {
2028         struct smc_clc_msg_proposal_prefix *pclc_prfx;
2029         struct socket *newclcsock = new_smc->clcsock;
2030
2031         if (pclc->hdr.typev1 == SMC_TYPE_N)
2032                 return 0;
2033         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
2034         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
2035                 return SMC_CLC_DECL_DIFFPREFIX;
2036
2037         return 0;
2038 }
2039
2040 /* listen worker: initialize connection and buffers */
2041 static int smc_listen_rdma_init(struct smc_sock *new_smc,
2042                                 struct smc_init_info *ini)
2043 {
2044         int rc;
2045
2046         /* allocate connection / link group */
2047         rc = smc_conn_create(new_smc, ini);
2048         if (rc)
2049                 return rc;
2050
2051         /* create send buffer and rmb */
2052         if (smc_buf_create(new_smc, false)) {
2053                 smc_conn_abort(new_smc, ini->first_contact_local);
2054                 return SMC_CLC_DECL_MEM;
2055         }
2056
2057         return 0;
2058 }
2059
2060 /* listen worker: initialize connection and buffers for SMC-D */
2061 static int smc_listen_ism_init(struct smc_sock *new_smc,
2062                                struct smc_init_info *ini)
2063 {
2064         int rc;
2065
2066         rc = smc_conn_create(new_smc, ini);
2067         if (rc)
2068                 return rc;
2069
2070         /* Create send and receive buffers */
2071         rc = smc_buf_create(new_smc, true);
2072         if (rc) {
2073                 smc_conn_abort(new_smc, ini->first_contact_local);
2074                 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
2075                                          SMC_CLC_DECL_MEM;
2076         }
2077
2078         return 0;
2079 }
2080
2081 static bool smc_is_already_selected(struct smcd_dev *smcd,
2082                                     struct smc_init_info *ini,
2083                                     int matches)
2084 {
2085         int i;
2086
2087         for (i = 0; i < matches; i++)
2088                 if (smcd == ini->ism_dev[i])
2089                         return true;
2090
2091         return false;
2092 }
2093
2094 /* check for ISM devices matching proposed ISM devices */
2095 static void smc_check_ism_v2_match(struct smc_init_info *ini,
2096                                    u16 proposed_chid,
2097                                    struct smcd_gid *proposed_gid,
2098                                    unsigned int *matches)
2099 {
2100         struct smcd_dev *smcd;
2101
2102         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2103                 if (smcd->going_away)
2104                         continue;
2105                 if (smc_is_already_selected(smcd, ini, *matches))
2106                         continue;
2107                 if (smc_ism_get_chid(smcd) == proposed_chid &&
2108                     !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
2109                         ini->ism_peer_gid[*matches].gid = proposed_gid->gid;
2110                         if (__smc_ism_is_emulated(proposed_chid))
2111                                 ini->ism_peer_gid[*matches].gid_ext =
2112                                                         proposed_gid->gid_ext;
2113                                 /* non-Emulated-ISM's peer gid_ext remains 0. */
2114                         ini->ism_dev[*matches] = smcd;
2115                         (*matches)++;
2116                         break;
2117                 }
2118         }
2119 }
2120
2121 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2122 {
2123         if (!ini->rc)
2124                 ini->rc = rc;
2125 }
2126
2127 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2128                                         struct smc_clc_msg_proposal *pclc,
2129                                         struct smc_init_info *ini)
2130 {
2131         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2132         struct smc_clc_v2_extension *smc_v2_ext;
2133         struct smc_clc_msg_smcd *pclc_smcd;
2134         unsigned int matches = 0;
2135         struct smcd_gid smcd_gid;
2136         u8 smcd_version;
2137         u8 *eid = NULL;
2138         int i, rc;
2139         u16 chid;
2140
2141         if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
2142                 goto not_found;
2143
2144         pclc_smcd = smc_get_clc_msg_smcd(pclc);
2145         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2146         smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
2147
2148         mutex_lock(&smcd_dev_list.mutex);
2149         if (pclc_smcd->ism.chid) {
2150                 /* check for ISM device matching proposed native ISM device */
2151                 smcd_gid.gid = ntohll(pclc_smcd->ism.gid);
2152                 smcd_gid.gid_ext = 0;
2153                 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2154                                        &smcd_gid, &matches);
2155         }
2156         for (i = 0; i < smc_v2_ext->hdr.ism_gid_cnt; i++) {
2157                 /* check for ISM devices matching proposed non-native ISM
2158                  * devices
2159                  */
2160                 smcd_gid.gid = ntohll(smcd_v2_ext->gidchid[i].gid);
2161                 smcd_gid.gid_ext = 0;
2162                 chid = ntohs(smcd_v2_ext->gidchid[i].chid);
2163                 if (__smc_ism_is_emulated(chid)) {
2164                         if ((i + 1) == smc_v2_ext->hdr.ism_gid_cnt ||
2165                             chid != ntohs(smcd_v2_ext->gidchid[i + 1].chid))
2166                                 /* each Emulated-ISM device takes two GID-CHID
2167                                  * entries and CHID of the second entry repeats
2168                                  * that of the first entry.
2169                                  *
2170                                  * So check if the next GID-CHID entry exists
2171                                  * and both two entries' CHIDs are the same.
2172                                  */
2173                                 continue;
2174                         smcd_gid.gid_ext =
2175                                 ntohll(smcd_v2_ext->gidchid[++i].gid);
2176                 }
2177                 smc_check_ism_v2_match(ini, chid, &smcd_gid, &matches);
2178         }
2179         mutex_unlock(&smcd_dev_list.mutex);
2180
2181         if (!ini->ism_dev[0]) {
2182                 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
2183                 goto not_found;
2184         }
2185
2186         smc_ism_get_system_eid(&eid);
2187         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2188                                smcd_v2_ext->system_eid, eid))
2189                 goto not_found;
2190
2191         /* separate - outside the smcd_dev_list.lock */
2192         smcd_version = ini->smcd_version;
2193         for (i = 0; i < matches; i++) {
2194                 ini->smcd_version = SMC_V2;
2195                 ini->is_smcd = true;
2196                 ini->ism_selected = i;
2197                 rc = smc_listen_ism_init(new_smc, ini);
2198                 if (rc) {
2199                         smc_find_ism_store_rc(rc, ini);
2200                         /* try next active ISM device */
2201                         continue;
2202                 }
2203                 return; /* matching and usable V2 ISM device found */
2204         }
2205         /* no V2 ISM device could be initialized */
2206         ini->smcd_version = smcd_version;       /* restore original value */
2207         ini->negotiated_eid[0] = 0;
2208
2209 not_found:
2210         ini->smcd_version &= ~SMC_V2;
2211         ini->ism_dev[0] = NULL;
2212         ini->is_smcd = false;
2213 }
2214
2215 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2216                                         struct smc_clc_msg_proposal *pclc,
2217                                         struct smc_init_info *ini)
2218 {
2219         struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
2220         int rc = 0;
2221
2222         /* check if ISM V1 is available */
2223         if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
2224                 goto not_found;
2225         ini->is_smcd = true; /* prepare ISM check */
2226         ini->ism_peer_gid[0].gid = ntohll(pclc_smcd->ism.gid);
2227         ini->ism_peer_gid[0].gid_ext = 0;
2228         rc = smc_find_ism_device(new_smc, ini);
2229         if (rc)
2230                 goto not_found;
2231         ini->ism_selected = 0;
2232         rc = smc_listen_ism_init(new_smc, ini);
2233         if (!rc)
2234                 return;         /* V1 ISM device found */
2235
2236 not_found:
2237         smc_find_ism_store_rc(rc, ini);
2238         ini->smcd_version &= ~SMC_V1;
2239         ini->ism_dev[0] = NULL;
2240         ini->is_smcd = false;
2241 }
2242
2243 /* listen worker: register buffers */
2244 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
2245 {
2246         struct smc_connection *conn = &new_smc->conn;
2247
2248         if (!local_first) {
2249                 /* reg sendbufs if they were vzalloced */
2250                 if (conn->sndbuf_desc->is_vm) {
2251                         if (smcr_lgr_reg_sndbufs(conn->lnk,
2252                                                  conn->sndbuf_desc))
2253                                 return SMC_CLC_DECL_ERR_REGBUF;
2254                 }
2255                 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
2256                         return SMC_CLC_DECL_ERR_REGBUF;
2257         }
2258
2259         return 0;
2260 }
2261
2262 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2263                                          struct smc_clc_msg_proposal *pclc,
2264                                          struct smc_init_info *ini)
2265 {
2266         struct smc_clc_v2_extension *smc_v2_ext;
2267         u8 smcr_version;
2268         int rc;
2269
2270         if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2271                 goto not_found;
2272
2273         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2274         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2275                 goto not_found;
2276
2277         /* prepare RDMA check */
2278         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2279         memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2280         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2281         ini->check_smcrv2 = true;
2282         ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2283         ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2284         ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2285         rc = smc_find_rdma_device(new_smc, ini);
2286         if (rc) {
2287                 smc_find_ism_store_rc(rc, ini);
2288                 goto not_found;
2289         }
2290         if (!ini->smcrv2.uses_gateway)
2291                 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2292
2293         smcr_version = ini->smcr_version;
2294         ini->smcr_version = SMC_V2;
2295         rc = smc_listen_rdma_init(new_smc, ini);
2296         if (!rc) {
2297                 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2298                 if (rc)
2299                         smc_conn_abort(new_smc, ini->first_contact_local);
2300         }
2301         if (!rc)
2302                 return;
2303         ini->smcr_version = smcr_version;
2304         smc_find_ism_store_rc(rc, ini);
2305
2306 not_found:
2307         ini->smcr_version &= ~SMC_V2;
2308         ini->smcrv2.ib_dev_v2 = NULL;
2309         ini->check_smcrv2 = false;
2310 }
2311
2312 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2313                                         struct smc_clc_msg_proposal *pclc,
2314                                         struct smc_init_info *ini)
2315 {
2316         int rc;
2317
2318         if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
2319                 return SMC_CLC_DECL_NOSMCDEV;
2320
2321         /* prepare RDMA check */
2322         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2323         memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2324         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2325         rc = smc_find_rdma_device(new_smc, ini);
2326         if (rc) {
2327                 /* no RDMA device found */
2328                 return SMC_CLC_DECL_NOSMCDEV;
2329         }
2330         rc = smc_listen_rdma_init(new_smc, ini);
2331         if (rc)
2332                 return rc;
2333         return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2334 }
2335
2336 /* determine the local device matching to proposal */
2337 static int smc_listen_find_device(struct smc_sock *new_smc,
2338                                   struct smc_clc_msg_proposal *pclc,
2339                                   struct smc_init_info *ini)
2340 {
2341         int prfx_rc;
2342
2343         /* check for ISM device matching V2 proposed device */
2344         smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2345         if (ini->ism_dev[0])
2346                 return 0;
2347
2348         /* check for matching IP prefix and subnet length (V1) */
2349         prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2350         if (prfx_rc)
2351                 smc_find_ism_store_rc(prfx_rc, ini);
2352
2353         /* get vlan id from IP device */
2354         if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
2355                 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
2356
2357         /* check for ISM device matching V1 proposed device */
2358         if (!prfx_rc)
2359                 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
2360         if (ini->ism_dev[0])
2361                 return 0;
2362
2363         if (!smcr_indicated(pclc->hdr.typev1) &&
2364             !smcr_indicated(pclc->hdr.typev2))
2365                 /* skip RDMA and decline */
2366                 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
2367
2368         /* check if RDMA V2 is available */
2369         smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2370         if (ini->smcrv2.ib_dev_v2)
2371                 return 0;
2372
2373         /* check if RDMA V1 is available */
2374         if (!prfx_rc) {
2375                 int rc;
2376
2377                 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2378                 smc_find_ism_store_rc(rc, ini);
2379                 return (!rc) ? 0 : ini->rc;
2380         }
2381         return prfx_rc;
2382 }
2383
2384 /* listen worker: finish RDMA setup */
2385 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2386                                   struct smc_clc_msg_accept_confirm *cclc,
2387                                   bool local_first,
2388                                   struct smc_init_info *ini)
2389 {
2390         struct smc_link *link = new_smc->conn.lnk;
2391         int reason_code = 0;
2392
2393         if (local_first)
2394                 smc_link_save_peer_info(link, cclc, ini);
2395
2396         if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2397                 return SMC_CLC_DECL_ERR_RTOK;
2398
2399         if (local_first) {
2400                 if (smc_ib_ready_link(link))
2401                         return SMC_CLC_DECL_ERR_RDYLNK;
2402                 /* QP confirmation over RoCE fabric */
2403                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
2404                 reason_code = smcr_serv_conf_first_link(new_smc);
2405                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
2406         }
2407         return reason_code;
2408 }
2409
2410 /* setup for connection of server */
2411 static void smc_listen_work(struct work_struct *work)
2412 {
2413         struct smc_sock *new_smc = container_of(work, struct smc_sock,
2414                                                 smc_listen_work);
2415         struct socket *newclcsock = new_smc->clcsock;
2416         struct smc_clc_msg_accept_confirm *cclc;
2417         struct smc_clc_msg_proposal_area *buf;
2418         struct smc_clc_msg_proposal *pclc;
2419         struct smc_init_info *ini = NULL;
2420         u8 proposal_version = SMC_V1;
2421         u8 accept_version;
2422         int rc = 0;
2423
2424         if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2425                 return smc_listen_out_err(new_smc);
2426
2427         if (new_smc->use_fallback) {
2428                 smc_listen_out_connected(new_smc);
2429                 return;
2430         }
2431
2432         /* check if peer is smc capable */
2433         if (!tcp_sk(newclcsock->sk)->syn_smc) {
2434                 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2435                 if (rc)
2436                         smc_listen_out_err(new_smc);
2437                 else
2438                         smc_listen_out_connected(new_smc);
2439                 return;
2440         }
2441
2442         /* do inband token exchange -
2443          * wait for and receive SMC Proposal CLC message
2444          */
2445         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2446         if (!buf) {
2447                 rc = SMC_CLC_DECL_MEM;
2448                 goto out_decl;
2449         }
2450         pclc = (struct smc_clc_msg_proposal *)buf;
2451         rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
2452                               SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
2453         if (rc)
2454                 goto out_decl;
2455
2456         if (pclc->hdr.version > SMC_V1)
2457                 proposal_version = SMC_V2;
2458
2459         /* IPSec connections opt out of SMC optimizations */
2460         if (using_ipsec(new_smc)) {
2461                 rc = SMC_CLC_DECL_IPSEC;
2462                 goto out_decl;
2463         }
2464
2465         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2466         if (!ini) {
2467                 rc = SMC_CLC_DECL_MEM;
2468                 goto out_decl;
2469         }
2470
2471         /* initial version checking */
2472         rc = smc_listen_v2_check(new_smc, pclc, ini);
2473         if (rc)
2474                 goto out_decl;
2475
2476         rc = smc_clc_srv_v2x_features_validate(new_smc, pclc, ini);
2477         if (rc)
2478                 goto out_decl;
2479
2480         mutex_lock(&smc_server_lgr_pending);
2481         smc_close_init(new_smc);
2482         smc_rx_init(new_smc);
2483         smc_tx_init(new_smc);
2484
2485         /* determine ISM or RoCE device used for connection */
2486         rc = smc_listen_find_device(new_smc, pclc, ini);
2487         if (rc)
2488                 goto out_unlock;
2489
2490         /* send SMC Accept CLC message */
2491         accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
2492         rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
2493                                  accept_version, ini->negotiated_eid, ini);
2494         if (rc)
2495                 goto out_unlock;
2496
2497         /* SMC-D does not need this lock any more */
2498         if (ini->is_smcd)
2499                 mutex_unlock(&smc_server_lgr_pending);
2500
2501         /* receive SMC Confirm CLC message */
2502         memset(buf, 0, sizeof(*buf));
2503         cclc = (struct smc_clc_msg_accept_confirm *)buf;
2504         rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
2505                               SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2506         if (rc) {
2507                 if (!ini->is_smcd)
2508                         goto out_unlock;
2509                 goto out_decl;
2510         }
2511
2512         rc = smc_clc_v2x_features_confirm_check(cclc, ini);
2513         if (rc) {
2514                 if (!ini->is_smcd)
2515                         goto out_unlock;
2516                 goto out_decl;
2517         }
2518
2519         /* fce smc release version is needed in smc_listen_rdma_finish,
2520          * so save fce info here.
2521          */
2522         smc_conn_save_peer_info_fce(new_smc, cclc);
2523
2524         /* finish worker */
2525         if (!ini->is_smcd) {
2526                 rc = smc_listen_rdma_finish(new_smc, cclc,
2527                                             ini->first_contact_local, ini);
2528                 if (rc)
2529                         goto out_unlock;
2530                 mutex_unlock(&smc_server_lgr_pending);
2531         }
2532         smc_conn_save_peer_info(new_smc, cclc);
2533
2534         if (ini->is_smcd &&
2535             smc_ism_support_dmb_nocopy(new_smc->conn.lgr->smcd)) {
2536                 rc = smcd_buf_attach(new_smc);
2537                 if (rc)
2538                         goto out_decl;
2539         }
2540
2541         smc_listen_out_connected(new_smc);
2542         SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
2543         goto out_free;
2544
2545 out_unlock:
2546         mutex_unlock(&smc_server_lgr_pending);
2547 out_decl:
2548         smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
2549                            proposal_version);
2550 out_free:
2551         kfree(ini);
2552         kfree(buf);
2553 }
2554
2555 static void smc_tcp_listen_work(struct work_struct *work)
2556 {
2557         struct smc_sock *lsmc = container_of(work, struct smc_sock,
2558                                              tcp_listen_work);
2559         struct sock *lsk = &lsmc->sk;
2560         struct smc_sock *new_smc;
2561         int rc = 0;
2562
2563         lock_sock(lsk);
2564         while (lsk->sk_state == SMC_LISTEN) {
2565                 rc = smc_clcsock_accept(lsmc, &new_smc);
2566                 if (rc) /* clcsock accept queue empty or error */
2567                         goto out;
2568                 if (!new_smc)
2569                         continue;
2570
2571                 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2572                         atomic_inc(&lsmc->queued_smc_hs);
2573
2574                 new_smc->listen_smc = lsmc;
2575                 new_smc->use_fallback = lsmc->use_fallback;
2576                 new_smc->fallback_rsn = lsmc->fallback_rsn;
2577                 sock_hold(lsk); /* sock_put in smc_listen_work */
2578                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2579                 smc_copy_sock_settings_to_smc(new_smc);
2580                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
2581                 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
2582                         sock_put(&new_smc->sk);
2583         }
2584
2585 out:
2586         release_sock(lsk);
2587         sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2588 }
2589
2590 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2591 {
2592         struct smc_sock *lsmc;
2593
2594         read_lock_bh(&listen_clcsock->sk_callback_lock);
2595         lsmc = smc_clcsock_user_data(listen_clcsock);
2596         if (!lsmc)
2597                 goto out;
2598         lsmc->clcsk_data_ready(listen_clcsock);
2599         if (lsmc->sk.sk_state == SMC_LISTEN) {
2600                 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
2601                 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
2602                         sock_put(&lsmc->sk);
2603         }
2604 out:
2605         read_unlock_bh(&listen_clcsock->sk_callback_lock);
2606 }
2607
2608 static int smc_listen(struct socket *sock, int backlog)
2609 {
2610         struct sock *sk = sock->sk;
2611         struct smc_sock *smc;
2612         int rc;
2613
2614         smc = smc_sk(sk);
2615         lock_sock(sk);
2616
2617         rc = -EINVAL;
2618         if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2619             smc->connect_nonblock || sock->state != SS_UNCONNECTED)
2620                 goto out;
2621
2622         rc = 0;
2623         if (sk->sk_state == SMC_LISTEN) {
2624                 sk->sk_max_ack_backlog = backlog;
2625                 goto out;
2626         }
2627         /* some socket options are handled in core, so we could not apply
2628          * them to the clc socket -- copy smc socket options to clc socket
2629          */
2630         smc_copy_sock_settings_to_clc(smc);
2631         if (!smc->use_fallback)
2632                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
2633
2634         /* save original sk_data_ready function and establish
2635          * smc-specific sk_data_ready function
2636          */
2637         write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2638         smc->clcsock->sk->sk_user_data =
2639                 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
2640         smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2641                                smc_clcsock_data_ready, &smc->clcsk_data_ready);
2642         write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2643
2644         /* save original ops */
2645         smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2646
2647         smc->af_ops = *smc->ori_af_ops;
2648         smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2649
2650         inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2651
2652         if (smc->limit_smc_hs)
2653                 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
2654
2655         rc = kernel_listen(smc->clcsock, backlog);
2656         if (rc) {
2657                 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2658                 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2659                                        &smc->clcsk_data_ready);
2660                 smc->clcsock->sk->sk_user_data = NULL;
2661                 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2662                 goto out;
2663         }
2664         sk->sk_max_ack_backlog = backlog;
2665         sk->sk_ack_backlog = 0;
2666         sk->sk_state = SMC_LISTEN;
2667
2668 out:
2669         release_sock(sk);
2670         return rc;
2671 }
2672
2673 static int smc_accept(struct socket *sock, struct socket *new_sock,
2674                       struct proto_accept_arg *arg)
2675 {
2676         struct sock *sk = sock->sk, *nsk;
2677         DECLARE_WAITQUEUE(wait, current);
2678         struct smc_sock *lsmc;
2679         long timeo;
2680         int rc = 0;
2681
2682         lsmc = smc_sk(sk);
2683         sock_hold(sk); /* sock_put below */
2684         lock_sock(sk);
2685
2686         if (lsmc->sk.sk_state != SMC_LISTEN) {
2687                 rc = -EINVAL;
2688                 release_sock(sk);
2689                 goto out;
2690         }
2691
2692         /* Wait for an incoming connection */
2693         timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
2694         add_wait_queue_exclusive(sk_sleep(sk), &wait);
2695         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2696                 set_current_state(TASK_INTERRUPTIBLE);
2697                 if (!timeo) {
2698                         rc = -EAGAIN;
2699                         break;
2700                 }
2701                 release_sock(sk);
2702                 timeo = schedule_timeout(timeo);
2703                 /* wakeup by sk_data_ready in smc_listen_work() */
2704                 sched_annotate_sleep();
2705                 lock_sock(sk);
2706                 if (signal_pending(current)) {
2707                         rc = sock_intr_errno(timeo);
2708                         break;
2709                 }
2710         }
2711         set_current_state(TASK_RUNNING);
2712         remove_wait_queue(sk_sleep(sk), &wait);
2713
2714         if (!rc)
2715                 rc = sock_error(nsk);
2716         release_sock(sk);
2717         if (rc)
2718                 goto out;
2719
2720         if (lsmc->sockopt_defer_accept && !(arg->flags & O_NONBLOCK)) {
2721                 /* wait till data arrives on the socket */
2722                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2723                                                                 MSEC_PER_SEC);
2724                 if (smc_sk(nsk)->use_fallback) {
2725                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2726
2727                         lock_sock(clcsk);
2728                         if (skb_queue_empty(&clcsk->sk_receive_queue))
2729                                 sk_wait_data(clcsk, &timeo, NULL);
2730                         release_sock(clcsk);
2731                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2732                         lock_sock(nsk);
2733                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
2734                         release_sock(nsk);
2735                 }
2736         }
2737
2738 out:
2739         sock_put(sk); /* sock_hold above */
2740         return rc;
2741 }
2742
2743 static int smc_getname(struct socket *sock, struct sockaddr *addr,
2744                        int peer)
2745 {
2746         struct smc_sock *smc;
2747
2748         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2749             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2750                 return -ENOTCONN;
2751
2752         smc = smc_sk(sock->sk);
2753
2754         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2755 }
2756
2757 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2758 {
2759         struct sock *sk = sock->sk;
2760         struct smc_sock *smc;
2761         int rc;
2762
2763         smc = smc_sk(sk);
2764         lock_sock(sk);
2765
2766         /* SMC does not support connect with fastopen */
2767         if (msg->msg_flags & MSG_FASTOPEN) {
2768                 /* not connected yet, fallback */
2769                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2770                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2771                         if (rc)
2772                                 goto out;
2773                 } else {
2774                         rc = -EINVAL;
2775                         goto out;
2776                 }
2777         } else if ((sk->sk_state != SMC_ACTIVE) &&
2778                    (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2779                    (sk->sk_state != SMC_INIT)) {
2780                 rc = -EPIPE;
2781                 goto out;
2782         }
2783
2784         if (smc->use_fallback) {
2785                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2786         } else {
2787                 rc = smc_tx_sendmsg(smc, msg, len);
2788                 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2789         }
2790 out:
2791         release_sock(sk);
2792         return rc;
2793 }
2794
2795 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2796                        int flags)
2797 {
2798         struct sock *sk = sock->sk;
2799         struct smc_sock *smc;
2800         int rc = -ENOTCONN;
2801
2802         smc = smc_sk(sk);
2803         lock_sock(sk);
2804         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2805                 /* socket was connected before, no more data to read */
2806                 rc = 0;
2807                 goto out;
2808         }
2809         if ((sk->sk_state == SMC_INIT) ||
2810             (sk->sk_state == SMC_LISTEN) ||
2811             (sk->sk_state == SMC_CLOSED))
2812                 goto out;
2813
2814         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2815                 rc = 0;
2816                 goto out;
2817         }
2818
2819         if (smc->use_fallback) {
2820                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2821         } else {
2822                 msg->msg_namelen = 0;
2823                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2824                 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2825         }
2826
2827 out:
2828         release_sock(sk);
2829         return rc;
2830 }
2831
2832 static __poll_t smc_accept_poll(struct sock *parent)
2833 {
2834         struct smc_sock *isk = smc_sk(parent);
2835         __poll_t mask = 0;
2836
2837         spin_lock(&isk->accept_q_lock);
2838         if (!list_empty(&isk->accept_q))
2839                 mask = EPOLLIN | EPOLLRDNORM;
2840         spin_unlock(&isk->accept_q_lock);
2841
2842         return mask;
2843 }
2844
2845 static __poll_t smc_poll(struct file *file, struct socket *sock,
2846                              poll_table *wait)
2847 {
2848         struct sock *sk = sock->sk;
2849         struct smc_sock *smc;
2850         __poll_t mask = 0;
2851
2852         if (!sk)
2853                 return EPOLLNVAL;
2854
2855         smc = smc_sk(sock->sk);
2856         if (smc->use_fallback) {
2857                 /* delegate to CLC child sock */
2858                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2859                 sk->sk_err = smc->clcsock->sk->sk_err;
2860         } else {
2861                 if (sk->sk_state != SMC_CLOSED)
2862                         sock_poll_wait(file, sock, wait);
2863                 if (sk->sk_err)
2864                         mask |= EPOLLERR;
2865                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2866                     (sk->sk_state == SMC_CLOSED))
2867                         mask |= EPOLLHUP;
2868                 if (sk->sk_state == SMC_LISTEN) {
2869                         /* woken up by sk_data_ready in smc_listen_work() */
2870                         mask |= smc_accept_poll(sk);
2871                 } else if (smc->use_fallback) { /* as result of connect_work()*/
2872                         mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2873                                                            wait);
2874                         sk->sk_err = smc->clcsock->sk->sk_err;
2875                 } else {
2876                         if ((sk->sk_state != SMC_INIT &&
2877                              atomic_read(&smc->conn.sndbuf_space)) ||
2878                             sk->sk_shutdown & SEND_SHUTDOWN) {
2879                                 mask |= EPOLLOUT | EPOLLWRNORM;
2880                         } else {
2881                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2882                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2883                         }
2884                         if (atomic_read(&smc->conn.bytes_to_rcv))
2885                                 mask |= EPOLLIN | EPOLLRDNORM;
2886                         if (sk->sk_shutdown & RCV_SHUTDOWN)
2887                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2888                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
2889                                 mask |= EPOLLIN;
2890                         if (smc->conn.urg_state == SMC_URG_VALID)
2891                                 mask |= EPOLLPRI;
2892                 }
2893         }
2894
2895         return mask;
2896 }
2897
2898 static int smc_shutdown(struct socket *sock, int how)
2899 {
2900         struct sock *sk = sock->sk;
2901         bool do_shutdown = true;
2902         struct smc_sock *smc;
2903         int rc = -EINVAL;
2904         int old_state;
2905         int rc1 = 0;
2906
2907         smc = smc_sk(sk);
2908
2909         if ((how < SHUT_RD) || (how > SHUT_RDWR))
2910                 return rc;
2911
2912         lock_sock(sk);
2913
2914         if (sock->state == SS_CONNECTING) {
2915                 if (sk->sk_state == SMC_ACTIVE)
2916                         sock->state = SS_CONNECTED;
2917                 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2918                          sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2919                          sk->sk_state == SMC_APPCLOSEWAIT1 ||
2920                          sk->sk_state == SMC_APPCLOSEWAIT2 ||
2921                          sk->sk_state == SMC_APPFINCLOSEWAIT)
2922                         sock->state = SS_DISCONNECTING;
2923         }
2924
2925         rc = -ENOTCONN;
2926         if ((sk->sk_state != SMC_ACTIVE) &&
2927             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2928             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2929             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2930             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2931             (sk->sk_state != SMC_APPFINCLOSEWAIT))
2932                 goto out;
2933         if (smc->use_fallback) {
2934                 rc = kernel_sock_shutdown(smc->clcsock, how);
2935                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2936                 if (sk->sk_shutdown == SHUTDOWN_MASK) {
2937                         sk->sk_state = SMC_CLOSED;
2938                         sk->sk_socket->state = SS_UNCONNECTED;
2939                         sock_put(sk);
2940                 }
2941                 goto out;
2942         }
2943         switch (how) {
2944         case SHUT_RDWR:         /* shutdown in both directions */
2945                 old_state = sk->sk_state;
2946                 rc = smc_close_active(smc);
2947                 if (old_state == SMC_ACTIVE &&
2948                     sk->sk_state == SMC_PEERCLOSEWAIT1)
2949                         do_shutdown = false;
2950                 break;
2951         case SHUT_WR:
2952                 rc = smc_close_shutdown_write(smc);
2953                 break;
2954         case SHUT_RD:
2955                 rc = 0;
2956                 /* nothing more to do because peer is not involved */
2957                 break;
2958         }
2959         if (do_shutdown && smc->clcsock)
2960                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2961         /* map sock_shutdown_cmd constants to sk_shutdown value range */
2962         sk->sk_shutdown |= how + 1;
2963
2964         if (sk->sk_state == SMC_CLOSED)
2965                 sock->state = SS_UNCONNECTED;
2966         else
2967                 sock->state = SS_DISCONNECTING;
2968 out:
2969         release_sock(sk);
2970         return rc ? rc : rc1;
2971 }
2972
2973 static int __smc_getsockopt(struct socket *sock, int level, int optname,
2974                             char __user *optval, int __user *optlen)
2975 {
2976         struct smc_sock *smc;
2977         int val, len;
2978
2979         smc = smc_sk(sock->sk);
2980
2981         if (get_user(len, optlen))
2982                 return -EFAULT;
2983
2984         len = min_t(int, len, sizeof(int));
2985
2986         if (len < 0)
2987                 return -EINVAL;
2988
2989         switch (optname) {
2990         case SMC_LIMIT_HS:
2991                 val = smc->limit_smc_hs;
2992                 break;
2993         default:
2994                 return -EOPNOTSUPP;
2995         }
2996
2997         if (put_user(len, optlen))
2998                 return -EFAULT;
2999         if (copy_to_user(optval, &val, len))
3000                 return -EFAULT;
3001
3002         return 0;
3003 }
3004
3005 static int __smc_setsockopt(struct socket *sock, int level, int optname,
3006                             sockptr_t optval, unsigned int optlen)
3007 {
3008         struct sock *sk = sock->sk;
3009         struct smc_sock *smc;
3010         int val, rc;
3011
3012         smc = smc_sk(sk);
3013
3014         lock_sock(sk);
3015         switch (optname) {
3016         case SMC_LIMIT_HS:
3017                 if (optlen < sizeof(int)) {
3018                         rc = -EINVAL;
3019                         break;
3020                 }
3021                 if (copy_from_sockptr(&val, optval, sizeof(int))) {
3022                         rc = -EFAULT;
3023                         break;
3024                 }
3025
3026                 smc->limit_smc_hs = !!val;
3027                 rc = 0;
3028                 break;
3029         default:
3030                 rc = -EOPNOTSUPP;
3031                 break;
3032         }
3033         release_sock(sk);
3034
3035         return rc;
3036 }
3037
3038 static int smc_setsockopt(struct socket *sock, int level, int optname,
3039                           sockptr_t optval, unsigned int optlen)
3040 {
3041         struct sock *sk = sock->sk;
3042         struct smc_sock *smc;
3043         int val, rc;
3044
3045         if (level == SOL_TCP && optname == TCP_ULP)
3046                 return -EOPNOTSUPP;
3047         else if (level == SOL_SMC)
3048                 return __smc_setsockopt(sock, level, optname, optval, optlen);
3049
3050         smc = smc_sk(sk);
3051
3052         /* generic setsockopts reaching us here always apply to the
3053          * CLC socket
3054          */
3055         mutex_lock(&smc->clcsock_release_lock);
3056         if (!smc->clcsock) {
3057                 mutex_unlock(&smc->clcsock_release_lock);
3058                 return -EBADF;
3059         }
3060         if (unlikely(!smc->clcsock->ops->setsockopt))
3061                 rc = -EOPNOTSUPP;
3062         else
3063                 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
3064                                                    optval, optlen);
3065         if (smc->clcsock->sk->sk_err) {
3066                 sk->sk_err = smc->clcsock->sk->sk_err;
3067                 sk_error_report(sk);
3068         }
3069         mutex_unlock(&smc->clcsock_release_lock);
3070
3071         if (optlen < sizeof(int))
3072                 return -EINVAL;
3073         if (copy_from_sockptr(&val, optval, sizeof(int)))
3074                 return -EFAULT;
3075
3076         lock_sock(sk);
3077         if (rc || smc->use_fallback)
3078                 goto out;
3079         switch (optname) {
3080         case TCP_FASTOPEN:
3081         case TCP_FASTOPEN_CONNECT:
3082         case TCP_FASTOPEN_KEY:
3083         case TCP_FASTOPEN_NO_COOKIE:
3084                 /* option not supported by SMC */
3085                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
3086                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
3087                 } else {
3088                         rc = -EINVAL;
3089                 }
3090                 break;
3091         case TCP_NODELAY:
3092                 if (sk->sk_state != SMC_INIT &&
3093                     sk->sk_state != SMC_LISTEN &&
3094                     sk->sk_state != SMC_CLOSED) {
3095                         if (val) {
3096                                 SMC_STAT_INC(smc, ndly_cnt);
3097                                 smc_tx_pending(&smc->conn);
3098                                 cancel_delayed_work(&smc->conn.tx_work);
3099                         }
3100                 }
3101                 break;
3102         case TCP_CORK:
3103                 if (sk->sk_state != SMC_INIT &&
3104                     sk->sk_state != SMC_LISTEN &&
3105                     sk->sk_state != SMC_CLOSED) {
3106                         if (!val) {
3107                                 SMC_STAT_INC(smc, cork_cnt);
3108                                 smc_tx_pending(&smc->conn);
3109                                 cancel_delayed_work(&smc->conn.tx_work);
3110                         }
3111                 }
3112                 break;
3113         case TCP_DEFER_ACCEPT:
3114                 smc->sockopt_defer_accept = val;
3115                 break;
3116         default:
3117                 break;
3118         }
3119 out:
3120         release_sock(sk);
3121
3122         return rc;
3123 }
3124
3125 static int smc_getsockopt(struct socket *sock, int level, int optname,
3126                           char __user *optval, int __user *optlen)
3127 {
3128         struct smc_sock *smc;
3129         int rc;
3130
3131         if (level == SOL_SMC)
3132                 return __smc_getsockopt(sock, level, optname, optval, optlen);
3133
3134         smc = smc_sk(sock->sk);
3135         mutex_lock(&smc->clcsock_release_lock);
3136         if (!smc->clcsock) {
3137                 mutex_unlock(&smc->clcsock_release_lock);
3138                 return -EBADF;
3139         }
3140         /* socket options apply to the CLC socket */
3141         if (unlikely(!smc->clcsock->ops->getsockopt)) {
3142                 mutex_unlock(&smc->clcsock_release_lock);
3143                 return -EOPNOTSUPP;
3144         }
3145         rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
3146                                            optval, optlen);
3147         mutex_unlock(&smc->clcsock_release_lock);
3148         return rc;
3149 }
3150
3151 static int smc_ioctl(struct socket *sock, unsigned int cmd,
3152                      unsigned long arg)
3153 {
3154         union smc_host_cursor cons, urg;
3155         struct smc_connection *conn;
3156         struct smc_sock *smc;
3157         int answ;
3158
3159         smc = smc_sk(sock->sk);
3160         conn = &smc->conn;
3161         lock_sock(&smc->sk);
3162         if (smc->use_fallback) {
3163                 if (!smc->clcsock) {
3164                         release_sock(&smc->sk);
3165                         return -EBADF;
3166                 }
3167                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
3168                 release_sock(&smc->sk);
3169                 return answ;
3170         }
3171         switch (cmd) {
3172         case SIOCINQ: /* same as FIONREAD */
3173                 if (smc->sk.sk_state == SMC_LISTEN) {
3174                         release_sock(&smc->sk);
3175                         return -EINVAL;
3176                 }
3177                 if (smc->sk.sk_state == SMC_INIT ||
3178                     smc->sk.sk_state == SMC_CLOSED)
3179                         answ = 0;
3180                 else
3181                         answ = atomic_read(&smc->conn.bytes_to_rcv);
3182                 break;
3183         case SIOCOUTQ:
3184                 /* output queue size (not send + not acked) */
3185                 if (smc->sk.sk_state == SMC_LISTEN) {
3186                         release_sock(&smc->sk);
3187                         return -EINVAL;
3188                 }
3189                 if (smc->sk.sk_state == SMC_INIT ||
3190                     smc->sk.sk_state == SMC_CLOSED)
3191                         answ = 0;
3192                 else
3193                         answ = smc->conn.sndbuf_desc->len -
3194                                         atomic_read(&smc->conn.sndbuf_space);
3195                 break;
3196         case SIOCOUTQNSD:
3197                 /* output queue size (not send only) */
3198                 if (smc->sk.sk_state == SMC_LISTEN) {
3199                         release_sock(&smc->sk);
3200                         return -EINVAL;
3201                 }
3202                 if (smc->sk.sk_state == SMC_INIT ||
3203                     smc->sk.sk_state == SMC_CLOSED)
3204                         answ = 0;
3205                 else
3206                         answ = smc_tx_prepared_sends(&smc->conn);
3207                 break;
3208         case SIOCATMARK:
3209                 if (smc->sk.sk_state == SMC_LISTEN) {
3210                         release_sock(&smc->sk);
3211                         return -EINVAL;
3212                 }
3213                 if (smc->sk.sk_state == SMC_INIT ||
3214                     smc->sk.sk_state == SMC_CLOSED) {
3215                         answ = 0;
3216                 } else {
3217                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3218                         smc_curs_copy(&urg, &conn->urg_curs, conn);
3219                         answ = smc_curs_diff(conn->rmb_desc->len,
3220                                              &cons, &urg) == 1;
3221                 }
3222                 break;
3223         default:
3224                 release_sock(&smc->sk);
3225                 return -ENOIOCTLCMD;
3226         }
3227         release_sock(&smc->sk);
3228
3229         return put_user(answ, (int __user *)arg);
3230 }
3231
3232 /* Map the affected portions of the rmbe into an spd, note the number of bytes
3233  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3234  * updates till whenever a respective page has been fully processed.
3235  * Note that subsequent recv() calls have to wait till all splice() processing
3236  * completed.
3237  */
3238 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3239                                struct pipe_inode_info *pipe, size_t len,
3240                                unsigned int flags)
3241 {
3242         struct sock *sk = sock->sk;
3243         struct smc_sock *smc;
3244         int rc = -ENOTCONN;
3245
3246         smc = smc_sk(sk);
3247         lock_sock(sk);
3248         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3249                 /* socket was connected before, no more data to read */
3250                 rc = 0;
3251                 goto out;
3252         }
3253         if (sk->sk_state == SMC_INIT ||
3254             sk->sk_state == SMC_LISTEN ||
3255             sk->sk_state == SMC_CLOSED)
3256                 goto out;
3257
3258         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3259                 rc = 0;
3260                 goto out;
3261         }
3262
3263         if (smc->use_fallback) {
3264                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3265                                                     pipe, len, flags);
3266         } else {
3267                 if (*ppos) {
3268                         rc = -ESPIPE;
3269                         goto out;
3270                 }
3271                 if (flags & SPLICE_F_NONBLOCK)
3272                         flags = MSG_DONTWAIT;
3273                 else
3274                         flags = 0;
3275                 SMC_STAT_INC(smc, splice_cnt);
3276                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
3277         }
3278 out:
3279         release_sock(sk);
3280
3281         return rc;
3282 }
3283
3284 /* must look like tcp */
3285 static const struct proto_ops smc_sock_ops = {
3286         .family         = PF_SMC,
3287         .owner          = THIS_MODULE,
3288         .release        = smc_release,
3289         .bind           = smc_bind,
3290         .connect        = smc_connect,
3291         .socketpair     = sock_no_socketpair,
3292         .accept         = smc_accept,
3293         .getname        = smc_getname,
3294         .poll           = smc_poll,
3295         .ioctl          = smc_ioctl,
3296         .listen         = smc_listen,
3297         .shutdown       = smc_shutdown,
3298         .setsockopt     = smc_setsockopt,
3299         .getsockopt     = smc_getsockopt,
3300         .sendmsg        = smc_sendmsg,
3301         .recvmsg        = smc_recvmsg,
3302         .mmap           = sock_no_mmap,
3303         .splice_read    = smc_splice_read,
3304 };
3305
3306 static int __smc_create(struct net *net, struct socket *sock, int protocol,
3307                         int kern, struct socket *clcsock)
3308 {
3309         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
3310         struct smc_sock *smc;
3311         struct sock *sk;
3312         int rc;
3313
3314         rc = -ESOCKTNOSUPPORT;
3315         if (sock->type != SOCK_STREAM)
3316                 goto out;
3317
3318         rc = -EPROTONOSUPPORT;
3319         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
3320                 goto out;
3321
3322         rc = -ENOBUFS;
3323         sock->ops = &smc_sock_ops;
3324         sock->state = SS_UNCONNECTED;
3325         sk = smc_sock_alloc(net, sock, protocol);
3326         if (!sk)
3327                 goto out;
3328
3329         /* create internal TCP socket for CLC handshake and fallback */
3330         smc = smc_sk(sk);
3331         smc->use_fallback = false; /* assume rdma capability first */
3332         smc->fallback_rsn = 0;
3333
3334         /* default behavior from limit_smc_hs in every net namespace */
3335         smc->limit_smc_hs = net->smc.limit_smc_hs;
3336
3337         rc = 0;
3338         if (!clcsock) {
3339                 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3340                                       &smc->clcsock);
3341                 if (rc) {
3342                         sk_common_release(sk);
3343                         goto out;
3344                 }
3345
3346                 /* smc_clcsock_release() does not wait smc->clcsock->sk's
3347                  * destruction;  its sk_state might not be TCP_CLOSE after
3348                  * smc->sk is close()d, and TCP timers can be fired later,
3349                  * which need net ref.
3350                  */
3351                 sk = smc->clcsock->sk;
3352                 __netns_tracker_free(net, &sk->ns_tracker, false);
3353                 sk->sk_net_refcnt = 1;
3354                 get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
3355                 sock_inuse_add(net, 1);
3356         } else {
3357                 smc->clcsock = clcsock;
3358         }
3359
3360 out:
3361         return rc;
3362 }
3363
3364 static int smc_create(struct net *net, struct socket *sock, int protocol,
3365                       int kern)
3366 {
3367         return __smc_create(net, sock, protocol, kern, NULL);
3368 }
3369
3370 static const struct net_proto_family smc_sock_family_ops = {
3371         .family = PF_SMC,
3372         .owner  = THIS_MODULE,
3373         .create = smc_create,
3374 };
3375
3376 static int smc_ulp_init(struct sock *sk)
3377 {
3378         struct socket *tcp = sk->sk_socket;
3379         struct net *net = sock_net(sk);
3380         struct socket *smcsock;
3381         int protocol, ret;
3382
3383         /* only TCP can be replaced */
3384         if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3385             (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3386                 return -ESOCKTNOSUPPORT;
3387         /* don't handle wq now */
3388         if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3389                 return -ENOTCONN;
3390
3391         if (sk->sk_family == AF_INET)
3392                 protocol = SMCPROTO_SMC;
3393         else
3394                 protocol = SMCPROTO_SMC6;
3395
3396         smcsock = sock_alloc();
3397         if (!smcsock)
3398                 return -ENFILE;
3399
3400         smcsock->type = SOCK_STREAM;
3401         __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3402         ret = __smc_create(net, smcsock, protocol, 1, tcp);
3403         if (ret) {
3404                 sock_release(smcsock); /* module_put() which ops won't be NULL */
3405                 return ret;
3406         }
3407
3408         /* replace tcp socket to smc */
3409         smcsock->file = tcp->file;
3410         smcsock->file->private_data = smcsock;
3411         smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3412         smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3413         tcp->file = NULL;
3414
3415         return ret;
3416 }
3417
3418 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3419                           const gfp_t priority)
3420 {
3421         struct inet_connection_sock *icsk = inet_csk(newsk);
3422
3423         /* don't inherit ulp ops to child when listen */
3424         icsk->icsk_ulp_ops = NULL;
3425 }
3426
3427 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3428         .name           = "smc",
3429         .owner          = THIS_MODULE,
3430         .init           = smc_ulp_init,
3431         .clone          = smc_ulp_clone,
3432 };
3433
3434 unsigned int smc_net_id;
3435
3436 static __net_init int smc_net_init(struct net *net)
3437 {
3438         int rc;
3439
3440         rc = smc_sysctl_net_init(net);
3441         if (rc)
3442                 return rc;
3443         return smc_pnet_net_init(net);
3444 }
3445
3446 static void __net_exit smc_net_exit(struct net *net)
3447 {
3448         smc_sysctl_net_exit(net);
3449         smc_pnet_net_exit(net);
3450 }
3451
3452 static __net_init int smc_net_stat_init(struct net *net)
3453 {
3454         return smc_stats_init(net);
3455 }
3456
3457 static void __net_exit smc_net_stat_exit(struct net *net)
3458 {
3459         smc_stats_exit(net);
3460 }
3461
3462 static struct pernet_operations smc_net_ops = {
3463         .init = smc_net_init,
3464         .exit = smc_net_exit,
3465         .id   = &smc_net_id,
3466         .size = sizeof(struct smc_net),
3467 };
3468
3469 static struct pernet_operations smc_net_stat_ops = {
3470         .init = smc_net_stat_init,
3471         .exit = smc_net_stat_exit,
3472 };
3473
3474 static int __init smc_init(void)
3475 {
3476         int rc;
3477
3478         rc = register_pernet_subsys(&smc_net_ops);
3479         if (rc)
3480                 return rc;
3481
3482         rc = register_pernet_subsys(&smc_net_stat_ops);
3483         if (rc)
3484                 goto out_pernet_subsys;
3485
3486         rc = smc_ism_init();
3487         if (rc)
3488                 goto out_pernet_subsys_stat;
3489         smc_clc_init();
3490
3491         rc = smc_nl_init();
3492         if (rc)
3493                 goto out_ism;
3494
3495         rc = smc_pnet_init();
3496         if (rc)
3497                 goto out_nl;
3498
3499         rc = -ENOMEM;
3500
3501         smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3502         if (!smc_tcp_ls_wq)
3503                 goto out_pnet;
3504
3505         smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3506         if (!smc_hs_wq)
3507                 goto out_alloc_tcp_ls_wq;
3508
3509         smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3510         if (!smc_close_wq)
3511                 goto out_alloc_hs_wq;
3512
3513         rc = smc_core_init();
3514         if (rc) {
3515                 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
3516                 goto out_alloc_wqs;
3517         }
3518
3519         rc = smc_llc_init();
3520         if (rc) {
3521                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
3522                 goto out_core;
3523         }
3524
3525         rc = smc_cdc_init();
3526         if (rc) {
3527                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
3528                 goto out_core;
3529         }
3530
3531         rc = proto_register(&smc_proto, 1);
3532         if (rc) {
3533                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
3534                 goto out_core;
3535         }
3536
3537         rc = proto_register(&smc_proto6, 1);
3538         if (rc) {
3539                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3540                 goto out_proto;
3541         }
3542
3543         rc = sock_register(&smc_sock_family_ops);
3544         if (rc) {
3545                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
3546                 goto out_proto6;
3547         }
3548         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
3549         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
3550
3551         rc = smc_ib_register_client();
3552         if (rc) {
3553                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3554                 goto out_sock;
3555         }
3556
3557         rc = smc_loopback_init();
3558         if (rc) {
3559                 pr_err("%s: smc_loopback_init fails with %d\n", __func__, rc);
3560                 goto out_ib;
3561         }
3562
3563         rc = tcp_register_ulp(&smc_ulp_ops);
3564         if (rc) {
3565                 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
3566                 goto out_lo;
3567         }
3568
3569         static_branch_enable(&tcp_have_smc);
3570         return 0;
3571
3572 out_lo:
3573         smc_loopback_exit();
3574 out_ib:
3575         smc_ib_unregister_client();
3576 out_sock:
3577         sock_unregister(PF_SMC);
3578 out_proto6:
3579         proto_unregister(&smc_proto6);
3580 out_proto:
3581         proto_unregister(&smc_proto);
3582 out_core:
3583         smc_core_exit();
3584 out_alloc_wqs:
3585         destroy_workqueue(smc_close_wq);
3586 out_alloc_hs_wq:
3587         destroy_workqueue(smc_hs_wq);
3588 out_alloc_tcp_ls_wq:
3589         destroy_workqueue(smc_tcp_ls_wq);
3590 out_pnet:
3591         smc_pnet_exit();
3592 out_nl:
3593         smc_nl_exit();
3594 out_ism:
3595         smc_clc_exit();
3596         smc_ism_exit();
3597 out_pernet_subsys_stat:
3598         unregister_pernet_subsys(&smc_net_stat_ops);
3599 out_pernet_subsys:
3600         unregister_pernet_subsys(&smc_net_ops);
3601
3602         return rc;
3603 }
3604
3605 static void __exit smc_exit(void)
3606 {
3607         static_branch_disable(&tcp_have_smc);
3608         tcp_unregister_ulp(&smc_ulp_ops);
3609         sock_unregister(PF_SMC);
3610         smc_core_exit();
3611         smc_loopback_exit();
3612         smc_ib_unregister_client();
3613         smc_ism_exit();
3614         destroy_workqueue(smc_close_wq);
3615         destroy_workqueue(smc_tcp_ls_wq);
3616         destroy_workqueue(smc_hs_wq);
3617         proto_unregister(&smc_proto6);
3618         proto_unregister(&smc_proto);
3619         smc_pnet_exit();
3620         smc_nl_exit();
3621         smc_clc_exit();
3622         unregister_pernet_subsys(&smc_net_stat_ops);
3623         unregister_pernet_subsys(&smc_net_ops);
3624         rcu_barrier();
3625 }
3626
3627 module_init(smc_init);
3628 module_exit(smc_exit);
3629
3630 MODULE_AUTHOR("Ursula Braun <[email protected]>");
3631 MODULE_DESCRIPTION("smc socket address family");
3632 MODULE_LICENSE("GPL");
3633 MODULE_ALIAS_NETPROTO(PF_SMC);
3634 MODULE_ALIAS_TCP_ULP("smc");
3635 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);