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 #include "smc_inet.h"
  58
  59 static DEFINE_MUTEX(smc_server_lgr_pending);    /* serialize link group
  60                                                  * creation on server
  61                                                  */
  62 static DEFINE_MUTEX(smc_client_lgr_pending);    /* serialize link group
  63                                                  * creation on client
  64                                                  */
  65
  66 static struct workqueue_struct  *smc_tcp_ls_wq; /* wq for tcp listen work */
  67 struct workqueue_struct *smc_hs_wq;     /* wq for handshake work */
  68 struct workqueue_struct *smc_close_wq;  /* wq for close work */
  69
  70 static void smc_tcp_listen_work(struct work_struct *);
  71 static void smc_connect_work(struct work_struct *);
  72
  73 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb)
  74 {
  75         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
  76         void *hdr;
  77
  78         if (cb_ctx->pos[0])
  79                 goto out;
  80
  81         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  82                           &smc_gen_nl_family, NLM_F_MULTI,
  83                           SMC_NETLINK_DUMP_HS_LIMITATION);
  84         if (!hdr)
  85                 return -ENOMEM;
  86
  87         if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED,
  88                        sock_net(skb->sk)->smc.limit_smc_hs))
  89                 goto err;
  90
  91         genlmsg_end(skb, hdr);
  92         cb_ctx->pos[0] = 1;
  93 out:
  94         return skb->len;
  95 err:
  96         genlmsg_cancel(skb, hdr);
  97         return -EMSGSIZE;
  98 }
  99
 100 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
 101 {
 102         sock_net(skb->sk)->smc.limit_smc_hs = true;
 103         return 0;
 104 }
 105
 106 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
 107 {
 108         sock_net(skb->sk)->smc.limit_smc_hs = false;
 109         return 0;
 110 }
 111
 112 static void smc_set_keepalive(struct sock *sk, int val)
 113 {
 114         struct smc_sock *smc = smc_sk(sk);
 115
 116         smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
 117 }
 118
 119 static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk,
 120                                           struct sk_buff *skb,
 121                                           struct request_sock *req,
 122                                           struct dst_entry *dst,
 123                                           struct request_sock *req_unhash,
 124                                           bool *own_req)
 125 {
 126         struct smc_sock *smc;
 127         struct sock *child;
 128
 129         smc = smc_clcsock_user_data(sk);
 130
 131         if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) >
 132                                 sk->sk_max_ack_backlog)
 133                 goto drop;
 134
 135         if (sk_acceptq_is_full(&smc->sk)) {
 136                 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 137                 goto drop;
 138         }
 139
 140         /* passthrough to original syn recv sock fct */
 141         child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash,
 142                                                own_req);
 143         /* child must not inherit smc or its ops */
 144         if (child) {
 145                 rcu_assign_sk_user_data(child, NULL);
 146
 147                 /* v4-mapped sockets don't inherit parent ops. Don't restore. */
 148                 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops)
 149                         inet_csk(child)->icsk_af_ops = smc->ori_af_ops;
 150         }
 151         return child;
 152
 153 drop:
 154         dst_release(dst);
 155         tcp_listendrop(sk);
 156         return NULL;
 157 }
 158
 159 static bool smc_hs_congested(const struct sock *sk)
 160 {
 161         const struct smc_sock *smc;
 162
 163         smc = smc_clcsock_user_data(sk);
 164
 165         if (!smc)
 166                 return true;
 167
 168         if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
 169                 return true;
 170
 171         return false;
 172 }
 173
 174 struct smc_hashinfo smc_v4_hashinfo = {
 175         .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
 176 };
 177
 178 struct smc_hashinfo smc_v6_hashinfo = {
 179         .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
 180 };
 181
 182 int smc_hash_sk(struct sock *sk)
 183 {
 184         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 185         struct hlist_head *head;
 186
 187         head = &h->ht;
 188
 189         write_lock_bh(&h->lock);
 190         sk_add_node(sk, head);
 191         write_unlock_bh(&h->lock);
 192         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 193
 194         return 0;
 195 }
 196
 197 void smc_unhash_sk(struct sock *sk)
 198 {
 199         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 200
 201         write_lock_bh(&h->lock);
 202         if (sk_del_node_init(sk))
 203                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 204         write_unlock_bh(&h->lock);
 205 }
 206
 207 /* This will be called before user really release sock_lock. So do the
 208  * work which we didn't do because of user hold the sock_lock in the
 209  * BH context
 210  */
 211 void smc_release_cb(struct sock *sk)
 212 {
 213         struct smc_sock *smc = smc_sk(sk);
 214
 215         if (smc->conn.tx_in_release_sock) {
 216                 smc_tx_pending(&smc->conn);
 217                 smc->conn.tx_in_release_sock = false;
 218         }
 219 }
 220
 221 struct proto smc_proto = {
 222         .name           = "SMC",
 223         .owner          = THIS_MODULE,
 224         .keepalive      = smc_set_keepalive,
 225         .hash           = smc_hash_sk,
 226         .unhash         = smc_unhash_sk,
 227         .release_cb     = smc_release_cb,
 228         .obj_size       = sizeof(struct smc_sock),
 229         .h.smc_hash     = &smc_v4_hashinfo,
 230         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 231 };
 232 EXPORT_SYMBOL_GPL(smc_proto);
 233
 234 struct proto smc_proto6 = {
 235         .name           = "SMC6",
 236         .owner          = THIS_MODULE,
 237         .keepalive      = smc_set_keepalive,
 238         .hash           = smc_hash_sk,
 239         .unhash         = smc_unhash_sk,
 240         .release_cb     = smc_release_cb,
 241         .obj_size       = sizeof(struct smc_sock),
 242         .h.smc_hash     = &smc_v6_hashinfo,
 243         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 244 };
 245 EXPORT_SYMBOL_GPL(smc_proto6);
 246
 247 static void smc_fback_restore_callbacks(struct smc_sock *smc)
 248 {
 249         struct sock *clcsk = smc->clcsock->sk;
 250
 251         write_lock_bh(&clcsk->sk_callback_lock);
 252         clcsk->sk_user_data = NULL;
 253
 254         smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
 255         smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
 256         smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
 257         smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
 258
 259         write_unlock_bh(&clcsk->sk_callback_lock);
 260 }
 261
 262 static void smc_restore_fallback_changes(struct smc_sock *smc)
 263 {
 264         if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
 265                 smc->clcsock->file->private_data = smc->sk.sk_socket;
 266                 smc->clcsock->file = NULL;
 267                 smc_fback_restore_callbacks(smc);
 268         }
 269 }
 270
 271 static int __smc_release(struct smc_sock *smc)
 272 {
 273         struct sock *sk = &smc->sk;
 274         int rc = 0;
 275
 276         if (!smc->use_fallback) {
 277                 rc = smc_close_active(smc);
 278                 smc_sock_set_flag(sk, SOCK_DEAD);
 279                 sk->sk_shutdown |= SHUTDOWN_MASK;
 280         } else {
 281                 if (sk->sk_state != SMC_CLOSED) {
 282                         if (sk->sk_state != SMC_LISTEN &&
 283                             sk->sk_state != SMC_INIT)
 284                                 sock_put(sk); /* passive closing */
 285                         if (sk->sk_state == SMC_LISTEN) {
 286                                 /* wake up clcsock accept */
 287                                 rc = kernel_sock_shutdown(smc->clcsock,
 288                                                           SHUT_RDWR);
 289                         }
 290                         sk->sk_state = SMC_CLOSED;
 291                         sk->sk_state_change(sk);
 292                 }
 293                 smc_restore_fallback_changes(smc);
 294         }
 295
 296         sk->sk_prot->unhash(sk);
 297
 298         if (sk->sk_state == SMC_CLOSED) {
 299                 if (smc->clcsock) {
 300                         release_sock(sk);
 301                         smc_clcsock_release(smc);
 302                         lock_sock(sk);
 303                 }
 304                 if (!smc->use_fallback)
 305                         smc_conn_free(&smc->conn);
 306         }
 307
 308         return rc;
 309 }
 310
 311 int smc_release(struct socket *sock)
 312 {
 313         struct sock *sk = sock->sk;
 314         struct smc_sock *smc;
 315         int old_state, rc = 0;
 316
 317         if (!sk)
 318                 goto out;
 319
 320         sock_hold(sk); /* sock_put below */
 321         smc = smc_sk(sk);
 322
 323         old_state = sk->sk_state;
 324
 325         /* cleanup for a dangling non-blocking connect */
 326         if (smc->connect_nonblock && old_state == SMC_INIT)
 327                 tcp_abort(smc->clcsock->sk, ECONNABORTED);
 328
 329         if (cancel_work_sync(&smc->connect_work))
 330                 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
 331
 332         if (sk->sk_state == SMC_LISTEN)
 333                 /* smc_close_non_accepted() is called and acquires
 334                  * sock lock for child sockets again
 335                  */
 336                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 337         else
 338                 lock_sock(sk);
 339
 340         if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
 341             !smc->use_fallback)
 342                 smc_close_active_abort(smc);
 343
 344         rc = __smc_release(smc);
 345
 346         /* detach socket */
 347         sock_orphan(sk);
 348         sock->sk = NULL;
 349         release_sock(sk);
 350
 351         sock_put(sk); /* sock_hold above */
 352         sock_put(sk); /* final sock_put */
 353 out:
 354         return rc;
 355 }
 356
 357 static void smc_destruct(struct sock *sk)
 358 {
 359         if (sk->sk_state != SMC_CLOSED)
 360                 return;
 361         if (!sock_flag(sk, SOCK_DEAD))
 362                 return;
 363 }
 364
 365 void smc_sk_init(struct net *net, struct sock *sk, int protocol)
 366 {
 367         struct smc_sock *smc = smc_sk(sk);
 368
 369         sk->sk_state = SMC_INIT;
 370         sk->sk_destruct = smc_destruct;
 371         sk->sk_protocol = protocol;
 372         WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
 373         WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
 374         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
 375         INIT_WORK(&smc->connect_work, smc_connect_work);
 376         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
 377         INIT_LIST_HEAD(&smc->accept_q);
 378         spin_lock_init(&smc->accept_q_lock);
 379         spin_lock_init(&smc->conn.send_lock);
 380         sk->sk_prot->hash(sk);
 381         mutex_init(&smc->clcsock_release_lock);
 382         smc_init_saved_callbacks(smc);
 383         smc->limit_smc_hs = net->smc.limit_smc_hs;
 384         smc->use_fallback = false; /* assume rdma capability first */
 385         smc->fallback_rsn = 0;
 386 }
 387
 388 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
 389                                    int protocol)
 390 {
 391         struct proto *prot;
 392         struct sock *sk;
 393
 394         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
 395         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
 396         if (!sk)
 397                 return NULL;
 398
 399         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
 400         smc_sk_init(net, sk, protocol);
 401
 402         return sk;
 403 }
 404
 405 int smc_bind(struct socket *sock, struct sockaddr *uaddr,
 406              int addr_len)
 407 {
 408         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 409         struct sock *sk = sock->sk;
 410         struct smc_sock *smc;
 411         int rc;
 412
 413         smc = smc_sk(sk);
 414
 415         /* replicate tests from inet_bind(), to be safe wrt. future changes */
 416         rc = -EINVAL;
 417         if (addr_len < sizeof(struct sockaddr_in))
 418                 goto out;
 419
 420         rc = -EAFNOSUPPORT;
 421         if (addr->sin_family != AF_INET &&
 422             addr->sin_family != AF_INET6 &&
 423             addr->sin_family != AF_UNSPEC)
 424                 goto out;
 425         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
 426         if (addr->sin_family == AF_UNSPEC &&
 427             addr->sin_addr.s_addr != htonl(INADDR_ANY))
 428                 goto out;
 429
 430         lock_sock(sk);
 431
 432         /* Check if socket is already active */
 433         rc = -EINVAL;
 434         if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
 435                 goto out_rel;
 436
 437         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
 438         smc->clcsock->sk->sk_reuseport = sk->sk_reuseport;
 439         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
 440
 441 out_rel:
 442         release_sock(sk);
 443 out:
 444         return rc;
 445 }
 446
 447 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
 448  * clc socket (since smc is not called for these options from net/core)
 449  */
 450
 451 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
 452                              (1UL << SOCK_KEEPOPEN) | \
 453                              (1UL << SOCK_LINGER) | \
 454                              (1UL << SOCK_BROADCAST) | \
 455                              (1UL << SOCK_TIMESTAMP) | \
 456                              (1UL << SOCK_DBG) | \
 457                              (1UL << SOCK_RCVTSTAMP) | \
 458                              (1UL << SOCK_RCVTSTAMPNS) | \
 459                              (1UL << SOCK_LOCALROUTE) | \
 460                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
 461                              (1UL << SOCK_RXQ_OVFL) | \
 462                              (1UL << SOCK_WIFI_STATUS) | \
 463                              (1UL << SOCK_NOFCS) | \
 464                              (1UL << SOCK_FILTER_LOCKED) | \
 465                              (1UL << SOCK_TSTAMP_NEW))
 466
 467 /* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */
 468 static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk,
 469                                      unsigned long mask)
 470 {
 471         nsk->sk_userlocks = osk->sk_userlocks;
 472         if (osk->sk_userlocks & SOCK_SNDBUF_LOCK)
 473                 nsk->sk_sndbuf = osk->sk_sndbuf;
 474         if (osk->sk_userlocks & SOCK_RCVBUF_LOCK)
 475                 nsk->sk_rcvbuf = osk->sk_rcvbuf;
 476 }
 477
 478 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
 479                                    unsigned long mask)
 480 {
 481         /* options we don't get control via setsockopt for */
 482         nsk->sk_type = osk->sk_type;
 483         nsk->sk_sndtimeo = osk->sk_sndtimeo;
 484         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
 485         nsk->sk_mark = READ_ONCE(osk->sk_mark);
 486         nsk->sk_priority = READ_ONCE(osk->sk_priority);
 487         nsk->sk_rcvlowat = osk->sk_rcvlowat;
 488         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
 489         nsk->sk_err = osk->sk_err;
 490
 491         nsk->sk_flags &= ~mask;
 492         nsk->sk_flags |= osk->sk_flags & mask;
 493
 494         smc_adjust_sock_bufsizes(nsk, osk, mask);
 495 }
 496
 497 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
 498 {
 499         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
 500 }
 501
 502 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
 503                              (1UL << SOCK_KEEPOPEN) | \
 504                              (1UL << SOCK_LINGER) | \
 505                              (1UL << SOCK_DBG))
 506 /* copy only settings and flags relevant for smc from clc to smc socket */
 507 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
 508 {
 509         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
 510 }
 511
 512 /* register the new vzalloced sndbuf on all links */
 513 static int smcr_lgr_reg_sndbufs(struct smc_link *link,
 514                                 struct smc_buf_desc *snd_desc)
 515 {
 516         struct smc_link_group *lgr = link->lgr;
 517         int i, rc = 0;
 518
 519         if (!snd_desc->is_vm)
 520                 return -EINVAL;
 521
 522         /* protect against parallel smcr_link_reg_buf() */
 523         down_write(&lgr->llc_conf_mutex);
 524         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 525                 if (!smc_link_active(&lgr->lnk[i]))
 526                         continue;
 527                 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc);
 528                 if (rc)
 529                         break;
 530         }
 531         up_write(&lgr->llc_conf_mutex);
 532         return rc;
 533 }
 534
 535 /* register the new rmb on all links */
 536 static int smcr_lgr_reg_rmbs(struct smc_link *link,
 537                              struct smc_buf_desc *rmb_desc)
 538 {
 539         struct smc_link_group *lgr = link->lgr;
 540         bool do_slow = false;
 541         int i, rc = 0;
 542
 543         rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
 544         if (rc)
 545                 return rc;
 546
 547         down_read(&lgr->llc_conf_mutex);
 548         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 549                 if (!smc_link_active(&lgr->lnk[i]))
 550                         continue;
 551                 if (!rmb_desc->is_reg_mr[link->link_idx]) {
 552                         up_read(&lgr->llc_conf_mutex);
 553                         goto slow_path;
 554                 }
 555         }
 556         /* mr register already */
 557         goto fast_path;
 558 slow_path:
 559         do_slow = true;
 560         /* protect against parallel smc_llc_cli_rkey_exchange() and
 561          * parallel smcr_link_reg_buf()
 562          */
 563         down_write(&lgr->llc_conf_mutex);
 564         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 565                 if (!smc_link_active(&lgr->lnk[i]))
 566                         continue;
 567                 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc);
 568                 if (rc)
 569                         goto out;
 570         }
 571 fast_path:
 572         /* exchange confirm_rkey msg with peer */
 573         rc = smc_llc_do_confirm_rkey(link, rmb_desc);
 574         if (rc) {
 575                 rc = -EFAULT;
 576                 goto out;
 577         }
 578         rmb_desc->is_conf_rkey = true;
 579 out:
 580         do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex);
 581         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
 582         return rc;
 583 }
 584
 585 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
 586 {
 587         struct smc_link *link = smc->conn.lnk;
 588         struct smc_llc_qentry *qentry;
 589         int rc;
 590
 591         /* Receive CONFIRM LINK request from server over RoCE fabric.
 592          * Increasing the client's timeout by twice as much as the server's
 593          * timeout by default can temporarily avoid decline messages of
 594          * both sides crossing or colliding
 595          */
 596         qentry = smc_llc_wait(link->lgr, NULL, 2 * SMC_LLC_WAIT_TIME,
 597                               SMC_LLC_CONFIRM_LINK);
 598         if (!qentry) {
 599                 struct smc_clc_msg_decline dclc;
 600
 601                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 602                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 603                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
 604         }
 605         smc_llc_save_peer_uid(qentry);
 606         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
 607         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
 608         if (rc)
 609                 return SMC_CLC_DECL_RMBE_EC;
 610
 611         rc = smc_ib_modify_qp_rts(link);
 612         if (rc)
 613                 return SMC_CLC_DECL_ERR_RDYLNK;
 614
 615         smc_wr_remember_qp_attr(link);
 616
 617         /* reg the sndbuf if it was vzalloced */
 618         if (smc->conn.sndbuf_desc->is_vm) {
 619                 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
 620                         return SMC_CLC_DECL_ERR_REGBUF;
 621         }
 622
 623         /* reg the rmb */
 624         if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
 625                 return SMC_CLC_DECL_ERR_REGBUF;
 626
 627         /* confirm_rkey is implicit on 1st contact */
 628         smc->conn.rmb_desc->is_conf_rkey = true;
 629
 630         /* send CONFIRM LINK response over RoCE fabric */
 631         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
 632         if (rc < 0)
 633                 return SMC_CLC_DECL_TIMEOUT_CL;
 634
 635         smc_llc_link_active(link);
 636         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
 637
 638         if (link->lgr->max_links > 1) {
 639                 /* optional 2nd link, receive ADD LINK request from server */
 640                 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
 641                                       SMC_LLC_ADD_LINK);
 642                 if (!qentry) {
 643                         struct smc_clc_msg_decline dclc;
 644
 645                         rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 646                                               SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 647                         if (rc == -EAGAIN)
 648                                 rc = 0; /* no DECLINE received, go with one link */
 649                         return rc;
 650                 }
 651                 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
 652                 smc_llc_cli_add_link(link, qentry);
 653         }
 654         return 0;
 655 }
 656
 657 static bool smc_isascii(char *hostname)
 658 {
 659         int i;
 660
 661         for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
 662                 if (!isascii(hostname[i]))
 663                         return false;
 664         return true;
 665 }
 666
 667 static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
 668                                         struct smc_clc_msg_accept_confirm *clc)
 669 {
 670         struct smc_clc_first_contact_ext *fce;
 671         int clc_v2_len;
 672
 673         if (clc->hdr.version == SMC_V1 ||
 674             !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
 675                 return;
 676
 677         if (smc->conn.lgr->is_smcd) {
 678                 memcpy(smc->conn.lgr->negotiated_eid, clc->d1.eid,
 679                        SMC_MAX_EID_LEN);
 680                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, d1);
 681         } else {
 682                 memcpy(smc->conn.lgr->negotiated_eid, clc->r1.eid,
 683                        SMC_MAX_EID_LEN);
 684                 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm, r1);
 685         }
 686         fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len);
 687         smc->conn.lgr->peer_os = fce->os_type;
 688         smc->conn.lgr->peer_smc_release = fce->release;
 689         if (smc_isascii(fce->hostname))
 690                 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
 691                        SMC_MAX_HOSTNAME_LEN);
 692 }
 693
 694 static void smcr_conn_save_peer_info(struct smc_sock *smc,
 695                                      struct smc_clc_msg_accept_confirm *clc)
 696 {
 697         int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
 698
 699         smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
 700         smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
 701         smc->conn.peer_rmbe_size = bufsize;
 702         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 703         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
 704 }
 705
 706 static void smcd_conn_save_peer_info(struct smc_sock *smc,
 707                                      struct smc_clc_msg_accept_confirm *clc)
 708 {
 709         int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
 710
 711         smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
 712         smc->conn.peer_token = ntohll(clc->d0.token);
 713         /* msg header takes up space in the buffer */
 714         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
 715         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 716         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
 717 }
 718
 719 static void smc_conn_save_peer_info(struct smc_sock *smc,
 720                                     struct smc_clc_msg_accept_confirm *clc)
 721 {
 722         if (smc->conn.lgr->is_smcd)
 723                 smcd_conn_save_peer_info(smc, clc);
 724         else
 725                 smcr_conn_save_peer_info(smc, clc);
 726         smc_conn_save_peer_info_fce(smc, clc);
 727 }
 728
 729 static void smc_link_save_peer_info(struct smc_link *link,
 730                                     struct smc_clc_msg_accept_confirm *clc,
 731                                     struct smc_init_info *ini)
 732 {
 733         link->peer_qpn = ntoh24(clc->r0.qpn);
 734         memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
 735         memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
 736         link->peer_psn = ntoh24(clc->r0.psn);
 737         link->peer_mtu = clc->r0.qp_mtu;
 738 }
 739
 740 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
 741                                        struct smc_stats_fback *fback_arr)
 742 {
 743         int cnt;
 744
 745         for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
 746                 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
 747                         fback_arr[cnt].count++;
 748                         break;
 749                 }
 750                 if (!fback_arr[cnt].fback_code) {
 751                         fback_arr[cnt].fback_code = smc->fallback_rsn;
 752                         fback_arr[cnt].count++;
 753                         break;
 754                 }
 755         }
 756 }
 757
 758 static void smc_stat_fallback(struct smc_sock *smc)
 759 {
 760         struct net *net = sock_net(&smc->sk);
 761
 762         mutex_lock(&net->smc.mutex_fback_rsn);
 763         if (smc->listen_smc) {
 764                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
 765                 net->smc.fback_rsn->srv_fback_cnt++;
 766         } else {
 767                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
 768                 net->smc.fback_rsn->clnt_fback_cnt++;
 769         }
 770         mutex_unlock(&net->smc.mutex_fback_rsn);
 771 }
 772
 773 /* must be called under rcu read lock */
 774 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
 775 {
 776         struct socket_wq *wq;
 777         __poll_t flags;
 778
 779         wq = rcu_dereference(smc->sk.sk_wq);
 780         if (!skwq_has_sleeper(wq))
 781                 return;
 782
 783         /* wake up smc sk->sk_wq */
 784         if (!key) {
 785                 /* sk_state_change */
 786                 wake_up_interruptible_all(&wq->wait);
 787         } else {
 788                 flags = key_to_poll(key);
 789                 if (flags & (EPOLLIN | EPOLLOUT))
 790                         /* sk_data_ready or sk_write_space */
 791                         wake_up_interruptible_sync_poll(&wq->wait, flags);
 792                 else if (flags & EPOLLERR)
 793                         /* sk_error_report */
 794                         wake_up_interruptible_poll(&wq->wait, flags);
 795         }
 796 }
 797
 798 static int smc_fback_mark_woken(wait_queue_entry_t *wait,
 799                                 unsigned int mode, int sync, void *key)
 800 {
 801         struct smc_mark_woken *mark =
 802                 container_of(wait, struct smc_mark_woken, wait_entry);
 803
 804         mark->woken = true;
 805         mark->key = key;
 806         return 0;
 807 }
 808
 809 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
 810                                      void (*clcsock_callback)(struct sock *sk))
 811 {
 812         struct smc_mark_woken mark = { .woken = false };
 813         struct socket_wq *wq;
 814
 815         init_waitqueue_func_entry(&mark.wait_entry,
 816                                   smc_fback_mark_woken);
 817         rcu_read_lock();
 818         wq = rcu_dereference(clcsk->sk_wq);
 819         if (!wq)
 820                 goto out;
 821         add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 822         clcsock_callback(clcsk);
 823         remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 824
 825         if (mark.woken)
 826                 smc_fback_wakeup_waitqueue(smc, mark.key);
 827 out:
 828         rcu_read_unlock();
 829 }
 830
 831 static void smc_fback_state_change(struct sock *clcsk)
 832 {
 833         struct smc_sock *smc;
 834
 835         read_lock_bh(&clcsk->sk_callback_lock);
 836         smc = smc_clcsock_user_data(clcsk);
 837         if (smc)
 838                 smc_fback_forward_wakeup(smc, clcsk,
 839                                          smc->clcsk_state_change);
 840         read_unlock_bh(&clcsk->sk_callback_lock);
 841 }
 842
 843 static void smc_fback_data_ready(struct sock *clcsk)
 844 {
 845         struct smc_sock *smc;
 846
 847         read_lock_bh(&clcsk->sk_callback_lock);
 848         smc = smc_clcsock_user_data(clcsk);
 849         if (smc)
 850                 smc_fback_forward_wakeup(smc, clcsk,
 851                                          smc->clcsk_data_ready);
 852         read_unlock_bh(&clcsk->sk_callback_lock);
 853 }
 854
 855 static void smc_fback_write_space(struct sock *clcsk)
 856 {
 857         struct smc_sock *smc;
 858
 859         read_lock_bh(&clcsk->sk_callback_lock);
 860         smc = smc_clcsock_user_data(clcsk);
 861         if (smc)
 862                 smc_fback_forward_wakeup(smc, clcsk,
 863                                          smc->clcsk_write_space);
 864         read_unlock_bh(&clcsk->sk_callback_lock);
 865 }
 866
 867 static void smc_fback_error_report(struct sock *clcsk)
 868 {
 869         struct smc_sock *smc;
 870
 871         read_lock_bh(&clcsk->sk_callback_lock);
 872         smc = smc_clcsock_user_data(clcsk);
 873         if (smc)
 874                 smc_fback_forward_wakeup(smc, clcsk,
 875                                          smc->clcsk_error_report);
 876         read_unlock_bh(&clcsk->sk_callback_lock);
 877 }
 878
 879 static void smc_fback_replace_callbacks(struct smc_sock *smc)
 880 {
 881         struct sock *clcsk = smc->clcsock->sk;
 882
 883         write_lock_bh(&clcsk->sk_callback_lock);
 884         clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
 885
 886         smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
 887                                &smc->clcsk_state_change);
 888         smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
 889                                &smc->clcsk_data_ready);
 890         smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
 891                                &smc->clcsk_write_space);
 892         smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
 893                                &smc->clcsk_error_report);
 894
 895         write_unlock_bh(&clcsk->sk_callback_lock);
 896 }
 897
 898 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
 899 {
 900         int rc = 0;
 901
 902         mutex_lock(&smc->clcsock_release_lock);
 903         if (!smc->clcsock) {
 904                 rc = -EBADF;
 905                 goto out;
 906         }
 907
 908         smc->use_fallback = true;
 909         smc->fallback_rsn = reason_code;
 910         smc_stat_fallback(smc);
 911         trace_smc_switch_to_fallback(smc, reason_code);
 912         if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
 913                 smc->clcsock->file = smc->sk.sk_socket->file;
 914                 smc->clcsock->file->private_data = smc->clcsock;
 915                 smc->clcsock->wq.fasync_list =
 916                         smc->sk.sk_socket->wq.fasync_list;
 917                 smc->sk.sk_socket->wq.fasync_list = NULL;
 918
 919                 /* There might be some wait entries remaining
 920                  * in smc sk->sk_wq and they should be woken up
 921                  * as clcsock's wait queue is woken up.
 922                  */
 923                 smc_fback_replace_callbacks(smc);
 924         }
 925 out:
 926         mutex_unlock(&smc->clcsock_release_lock);
 927         return rc;
 928 }
 929
 930 /* fall back during connect */
 931 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 932 {
 933         struct net *net = sock_net(&smc->sk);
 934         int rc = 0;
 935
 936         rc = smc_switch_to_fallback(smc, reason_code);
 937         if (rc) { /* fallback fails */
 938                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 939                 if (smc->sk.sk_state == SMC_INIT)
 940                         sock_put(&smc->sk); /* passive closing */
 941                 return rc;
 942         }
 943         smc_copy_sock_settings_to_clc(smc);
 944         smc->connect_nonblock = 0;
 945         if (smc->sk.sk_state == SMC_INIT)
 946                 smc->sk.sk_state = SMC_ACTIVE;
 947         return 0;
 948 }
 949
 950 /* decline and fall back during connect */
 951 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 952                                         u8 version)
 953 {
 954         struct net *net = sock_net(&smc->sk);
 955         int rc;
 956
 957         if (reason_code < 0) { /* error, fallback is not possible */
 958                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 959                 if (smc->sk.sk_state == SMC_INIT)
 960                         sock_put(&smc->sk); /* passive closing */
 961                 return reason_code;
 962         }
 963         if (reason_code != SMC_CLC_DECL_PEERDECL) {
 964                 rc = smc_clc_send_decline(smc, reason_code, version);
 965                 if (rc < 0) {
 966                         this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 967                         if (smc->sk.sk_state == SMC_INIT)
 968                                 sock_put(&smc->sk); /* passive closing */
 969                         return rc;
 970                 }
 971         }
 972         return smc_connect_fallback(smc, reason_code);
 973 }
 974
 975 static void smc_conn_abort(struct smc_sock *smc, int local_first)
 976 {
 977         struct smc_connection *conn = &smc->conn;
 978         struct smc_link_group *lgr = conn->lgr;
 979         bool lgr_valid = false;
 980
 981         if (smc_conn_lgr_valid(conn))
 982                 lgr_valid = true;
 983
 984         smc_conn_free(conn);
 985         if (local_first && lgr_valid)
 986                 smc_lgr_cleanup_early(lgr);
 987 }
 988
 989 /* check if there is a rdma device available for this connection. */
 990 /* called for connect and listen */
 991 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
 992 {
 993         /* PNET table look up: search active ib_device and port
 994          * within same PNETID that also contains the ethernet device
 995          * used for the internal TCP socket
 996          */
 997         smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
 998         if (!ini->check_smcrv2 && !ini->ib_dev)
 999                 return SMC_CLC_DECL_NOSMCRDEV;
1000         if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
1001                 return SMC_CLC_DECL_NOSMCRDEV;
1002         return 0;
1003 }
1004
1005 /* check if there is an ISM device available for this connection. */
1006 /* called for connect and listen */
1007 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
1008 {
1009         /* Find ISM device with same PNETID as connecting interface  */
1010         smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
1011         if (!ini->ism_dev[0])
1012                 return SMC_CLC_DECL_NOSMCDDEV;
1013         else
1014                 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
1015         return 0;
1016 }
1017
1018 /* is chid unique for the ism devices that are already determined? */
1019 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
1020                                            int cnt)
1021 {
1022         int i = (!ini->ism_dev[0]) ? 1 : 0;
1023
1024         for (; i < cnt; i++)
1025                 if (ini->ism_chid[i] == chid)
1026                         return false;
1027         return true;
1028 }
1029
1030 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
1031  * PNETID matching net_device)
1032  */
1033 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
1034                                        struct smc_init_info *ini)
1035 {
1036         int rc = SMC_CLC_DECL_NOSMCDDEV;
1037         struct smcd_dev *smcd;
1038         int i = 1, entry = 1;
1039         bool is_emulated;
1040         u16 chid;
1041
1042         if (smcd_indicated(ini->smc_type_v1))
1043                 rc = 0;         /* already initialized for V1 */
1044         mutex_lock(&smcd_dev_list.mutex);
1045         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1046                 if (smcd->going_away || smcd == ini->ism_dev[0])
1047                         continue;
1048                 chid = smc_ism_get_chid(smcd);
1049                 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
1050                         continue;
1051                 is_emulated = __smc_ism_is_emulated(chid);
1052                 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
1053                     smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
1054                         if (is_emulated && entry == SMCD_CLC_MAX_V2_GID_ENTRIES)
1055                                 /* It's the last GID-CHID entry left in CLC
1056                                  * Proposal SMC-Dv2 extension, but an Emulated-
1057                                  * ISM device will take two entries. So give
1058                                  * up it and try the next potential ISM device.
1059                                  */
1060                                 continue;
1061                         ini->ism_dev[i] = smcd;
1062                         ini->ism_chid[i] = chid;
1063                         ini->is_smcd = true;
1064                         rc = 0;
1065                         i++;
1066                         entry = is_emulated ? entry + 2 : entry + 1;
1067                         if (entry > SMCD_CLC_MAX_V2_GID_ENTRIES)
1068                                 break;
1069                 }
1070         }
1071         mutex_unlock(&smcd_dev_list.mutex);
1072         ini->ism_offered_cnt = i - 1;
1073         if (!ini->ism_dev[0] && !ini->ism_dev[1])
1074                 ini->smcd_version = 0;
1075
1076         return rc;
1077 }
1078
1079 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
1080 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
1081                                       struct smc_init_info *ini)
1082 {
1083         if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
1084                 return SMC_CLC_DECL_ISMVLANERR;
1085         return 0;
1086 }
1087
1088 static int smc_find_proposal_devices(struct smc_sock *smc,
1089                                      struct smc_init_info *ini)
1090 {
1091         int rc = 0;
1092
1093         /* check if there is an ism device available */
1094         if (!(ini->smcd_version & SMC_V1) ||
1095             smc_find_ism_device(smc, ini) ||
1096             smc_connect_ism_vlan_setup(smc, ini))
1097                 ini->smcd_version &= ~SMC_V1;
1098         /* else ISM V1 is supported for this connection */
1099
1100         /* check if there is an rdma device available */
1101         if (!(ini->smcr_version & SMC_V1) ||
1102             smc_find_rdma_device(smc, ini))
1103                 ini->smcr_version &= ~SMC_V1;
1104         /* else RDMA is supported for this connection */
1105
1106         ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1107                                               ini->smcr_version & SMC_V1);
1108
1109         /* check if there is an ism v2 device available */
1110         if (!(ini->smcd_version & SMC_V2) ||
1111             !smc_ism_is_v2_capable() ||
1112             smc_find_ism_v2_device_clnt(smc, ini))
1113                 ini->smcd_version &= ~SMC_V2;
1114
1115         /* check if there is an rdma v2 device available */
1116         ini->check_smcrv2 = true;
1117         ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1118         if (!(ini->smcr_version & SMC_V2) ||
1119             smc->clcsock->sk->sk_family != AF_INET ||
1120             !smc_clc_ueid_count() ||
1121             smc_find_rdma_device(smc, ini))
1122                 ini->smcr_version &= ~SMC_V2;
1123         ini->check_smcrv2 = false;
1124
1125         ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1126                                               ini->smcr_version & SMC_V2);
1127
1128         /* if neither ISM nor RDMA are supported, fallback */
1129         if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
1130                 rc = SMC_CLC_DECL_NOSMCDEV;
1131
1132         return rc;
1133 }
1134
1135 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1136  * used, the VLAN ID will be registered again during the connection setup.
1137  */
1138 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
1139                                         struct smc_init_info *ini)
1140 {
1141         if (!smcd_indicated(ini->smc_type_v1))
1142                 return 0;
1143         if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
1144                 return SMC_CLC_DECL_CNFERR;
1145         return 0;
1146 }
1147
1148 #define SMC_CLC_MAX_ACCEPT_LEN \
1149         (sizeof(struct smc_clc_msg_accept_confirm) + \
1150          sizeof(struct smc_clc_first_contact_ext_v2x) + \
1151          sizeof(struct smc_clc_msg_trail))
1152
1153 /* CLC handshake during connect */
1154 static int smc_connect_clc(struct smc_sock *smc,
1155                            struct smc_clc_msg_accept_confirm *aclc,
1156                            struct smc_init_info *ini)
1157 {
1158         int rc = 0;
1159
1160         /* do inband token exchange */
1161         rc = smc_clc_send_proposal(smc, ini);
1162         if (rc)
1163                 return rc;
1164         /* receive SMC Accept CLC message */
1165         return smc_clc_wait_msg(smc, aclc, SMC_CLC_MAX_ACCEPT_LEN,
1166                                 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
1167 }
1168
1169 void smc_fill_gid_list(struct smc_link_group *lgr,
1170                        struct smc_gidlist *gidlist,
1171                        struct smc_ib_device *known_dev, u8 *known_gid)
1172 {
1173         struct smc_init_info *alt_ini = NULL;
1174
1175         memset(gidlist, 0, sizeof(*gidlist));
1176         memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1177
1178         alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1179         if (!alt_ini)
1180                 goto out;
1181
1182         alt_ini->vlan_id = lgr->vlan_id;
1183         alt_ini->check_smcrv2 = true;
1184         alt_ini->smcrv2.saddr = lgr->saddr;
1185         smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1186
1187         if (!alt_ini->smcrv2.ib_dev_v2)
1188                 goto out;
1189
1190         memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1191                SMC_GID_SIZE);
1192
1193 out:
1194         kfree(alt_ini);
1195 }
1196
1197 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1198                                        struct smc_clc_msg_accept_confirm *aclc,
1199                                        struct smc_init_info *ini)
1200 {
1201         struct smc_clc_first_contact_ext *fce =
1202                 smc_get_clc_first_contact_ext(aclc, false);
1203         struct net *net = sock_net(&smc->sk);
1204         int rc;
1205
1206         if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1207                 return 0;
1208
1209         if (fce->v2_direct) {
1210                 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1211                 ini->smcrv2.uses_gateway = false;
1212         } else {
1213                 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr,
1214                                       smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1215                                       ini->smcrv2.nexthop_mac,
1216                                       &ini->smcrv2.uses_gateway))
1217                         return SMC_CLC_DECL_NOROUTE;
1218                 if (!ini->smcrv2.uses_gateway) {
1219                         /* mismatch: peer claims indirect, but its direct */
1220                         return SMC_CLC_DECL_NOINDIRECT;
1221                 }
1222         }
1223
1224         ini->release_nr = fce->release;
1225         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1226         if (rc)
1227                 return rc;
1228
1229         return 0;
1230 }
1231
1232 /* setup for RDMA connection of client */
1233 static int smc_connect_rdma(struct smc_sock *smc,
1234                             struct smc_clc_msg_accept_confirm *aclc,
1235                             struct smc_init_info *ini)
1236 {
1237         int i, reason_code = 0;
1238         struct smc_link *link;
1239         u8 *eid = NULL;
1240
1241         ini->is_smcd = false;
1242         ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
1243         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1244         memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1245         memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1246         memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
1247         ini->max_conns = SMC_CONN_PER_LGR_MAX;
1248         ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1249
1250         reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1251         if (reason_code)
1252                 return reason_code;
1253
1254         mutex_lock(&smc_client_lgr_pending);
1255         reason_code = smc_conn_create(smc, ini);
1256         if (reason_code) {
1257                 mutex_unlock(&smc_client_lgr_pending);
1258                 return reason_code;
1259         }
1260
1261         smc_conn_save_peer_info(smc, aclc);
1262
1263         if (ini->first_contact_local) {
1264                 link = smc->conn.lnk;
1265         } else {
1266                 /* set link that was assigned by server */
1267                 link = NULL;
1268                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1269                         struct smc_link *l = &smc->conn.lgr->lnk[i];
1270
1271                         if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1272                             !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1273                                     SMC_GID_SIZE) &&
1274                             (aclc->hdr.version > SMC_V1 ||
1275                              !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1276                                      sizeof(l->peer_mac)))) {
1277                                 link = l;
1278                                 break;
1279                         }
1280                 }
1281                 if (!link) {
1282                         reason_code = SMC_CLC_DECL_NOSRVLINK;
1283                         goto connect_abort;
1284                 }
1285                 smc_switch_link_and_count(&smc->conn, link);
1286         }
1287
1288         /* create send buffer and rmb */
1289         if (smc_buf_create(smc, false)) {
1290                 reason_code = SMC_CLC_DECL_MEM;
1291                 goto connect_abort;
1292         }
1293
1294         if (ini->first_contact_local)
1295                 smc_link_save_peer_info(link, aclc, ini);
1296
1297         if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1298                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1299                 goto connect_abort;
1300         }
1301
1302         smc_close_init(smc);
1303         smc_rx_init(smc);
1304
1305         if (ini->first_contact_local) {
1306                 if (smc_ib_ready_link(link)) {
1307                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1308                         goto connect_abort;
1309                 }
1310         } else {
1311                 /* reg sendbufs if they were vzalloced */
1312                 if (smc->conn.sndbuf_desc->is_vm) {
1313                         if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) {
1314                                 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1315                                 goto connect_abort;
1316                         }
1317                 }
1318                 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
1319                         reason_code = SMC_CLC_DECL_ERR_REGBUF;
1320                         goto connect_abort;
1321                 }
1322         }
1323
1324         if (aclc->hdr.version > SMC_V1) {
1325                 eid = aclc->r1.eid;
1326                 if (ini->first_contact_local)
1327                         smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1328                                           link->smcibdev, link->gid);
1329         }
1330
1331         reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
1332                                            aclc->hdr.version, eid, ini);
1333         if (reason_code)
1334                 goto connect_abort;
1335
1336         smc_tx_init(smc);
1337
1338         if (ini->first_contact_local) {
1339                 /* QP confirmation over RoCE fabric */
1340                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1341                 reason_code = smcr_clnt_conf_first_link(smc);
1342                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1343                 if (reason_code)
1344                         goto connect_abort;
1345         }
1346         mutex_unlock(&smc_client_lgr_pending);
1347
1348         smc_copy_sock_settings_to_clc(smc);
1349         smc->connect_nonblock = 0;
1350         if (smc->sk.sk_state == SMC_INIT)
1351                 smc->sk.sk_state = SMC_ACTIVE;
1352
1353         return 0;
1354 connect_abort:
1355         smc_conn_abort(smc, ini->first_contact_local);
1356         mutex_unlock(&smc_client_lgr_pending);
1357         smc->connect_nonblock = 0;
1358
1359         return reason_code;
1360 }
1361
1362 /* The server has chosen one of the proposed ISM devices for the communication.
1363  * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1364  */
1365 static int
1366 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm *aclc,
1367                                struct smc_init_info *ini)
1368 {
1369         int i;
1370
1371         for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
1372                 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
1373                         ini->ism_selected = i;
1374                         return 0;
1375                 }
1376         }
1377
1378         return -EPROTO;
1379 }
1380
1381 /* setup for ISM connection of client */
1382 static int smc_connect_ism(struct smc_sock *smc,
1383                            struct smc_clc_msg_accept_confirm *aclc,
1384                            struct smc_init_info *ini)
1385 {
1386         u8 *eid = NULL;
1387         int rc = 0;
1388
1389         ini->is_smcd = true;
1390         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1391
1392         if (aclc->hdr.version == SMC_V2) {
1393                 if (ini->first_contact_peer) {
1394                         struct smc_clc_first_contact_ext *fce =
1395                                 smc_get_clc_first_contact_ext(aclc, true);
1396
1397                         ini->release_nr = fce->release;
1398                         rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1399                         if (rc)
1400                                 return rc;
1401                 }
1402
1403                 rc = smc_v2_determine_accepted_chid(aclc, ini);
1404                 if (rc)
1405                         return rc;
1406
1407                 if (__smc_ism_is_emulated(ini->ism_chid[ini->ism_selected]))
1408                         ini->ism_peer_gid[ini->ism_selected].gid_ext =
1409                                                 ntohll(aclc->d1.gid_ext);
1410                 /* for non-Emulated-ISM devices, peer gid_ext remains 0. */
1411         }
1412         ini->ism_peer_gid[ini->ism_selected].gid = ntohll(aclc->d0.gid);
1413
1414         /* there is only one lgr role for SMC-D; use server lock */
1415         mutex_lock(&smc_server_lgr_pending);
1416         rc = smc_conn_create(smc, ini);
1417         if (rc) {
1418                 mutex_unlock(&smc_server_lgr_pending);
1419                 return rc;
1420         }
1421
1422         /* Create send and receive buffers */
1423         rc = smc_buf_create(smc, true);
1424         if (rc) {
1425                 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1426                 goto connect_abort;
1427         }
1428
1429         smc_conn_save_peer_info(smc, aclc);
1430
1431         if (smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) {
1432                 rc = smcd_buf_attach(smc);
1433                 if (rc) {
1434                         rc = SMC_CLC_DECL_MEM;  /* try to fallback */
1435                         goto connect_abort;
1436                 }
1437         }
1438         smc_close_init(smc);
1439         smc_rx_init(smc);
1440         smc_tx_init(smc);
1441
1442         if (aclc->hdr.version > SMC_V1)
1443                 eid = aclc->d1.eid;
1444
1445         rc = smc_clc_send_confirm(smc, ini->first_contact_local,
1446                                   aclc->hdr.version, eid, ini);
1447         if (rc)
1448                 goto connect_abort;
1449         mutex_unlock(&smc_server_lgr_pending);
1450
1451         smc_copy_sock_settings_to_clc(smc);
1452         smc->connect_nonblock = 0;
1453         if (smc->sk.sk_state == SMC_INIT)
1454                 smc->sk.sk_state = SMC_ACTIVE;
1455
1456         return 0;
1457 connect_abort:
1458         smc_conn_abort(smc, ini->first_contact_local);
1459         mutex_unlock(&smc_server_lgr_pending);
1460         smc->connect_nonblock = 0;
1461
1462         return rc;
1463 }
1464
1465 /* check if received accept type and version matches a proposed one */
1466 static int smc_connect_check_aclc(struct smc_init_info *ini,
1467                                   struct smc_clc_msg_accept_confirm *aclc)
1468 {
1469         if (aclc->hdr.typev1 != SMC_TYPE_R &&
1470             aclc->hdr.typev1 != SMC_TYPE_D)
1471                 return SMC_CLC_DECL_MODEUNSUPP;
1472
1473         if (aclc->hdr.version >= SMC_V2) {
1474                 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1475                      !smcr_indicated(ini->smc_type_v2)) ||
1476                     (aclc->hdr.typev1 == SMC_TYPE_D &&
1477                      !smcd_indicated(ini->smc_type_v2)))
1478                         return SMC_CLC_DECL_MODEUNSUPP;
1479         } else {
1480                 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1481                      !smcr_indicated(ini->smc_type_v1)) ||
1482                     (aclc->hdr.typev1 == SMC_TYPE_D &&
1483                      !smcd_indicated(ini->smc_type_v1)))
1484                         return SMC_CLC_DECL_MODEUNSUPP;
1485         }
1486
1487         return 0;
1488 }
1489
1490 /* perform steps before actually connecting */
1491 static int __smc_connect(struct smc_sock *smc)
1492 {
1493         u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1494         struct smc_clc_msg_accept_confirm *aclc;
1495         struct smc_init_info *ini = NULL;
1496         u8 *buf = NULL;
1497         int rc = 0;
1498
1499         if (smc->use_fallback)
1500                 return smc_connect_fallback(smc, smc->fallback_rsn);
1501
1502         /* if peer has not signalled SMC-capability, fall back */
1503         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
1504                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
1505
1506         /* IPSec connections opt out of SMC optimizations */
1507         if (using_ipsec(smc))
1508                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1509                                                     version);
1510
1511         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1512         if (!ini)
1513                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1514                                                     version);
1515
1516         ini->smcd_version = SMC_V1 | SMC_V2;
1517         ini->smcr_version = SMC_V1 | SMC_V2;
1518         ini->smc_type_v1 = SMC_TYPE_B;
1519         ini->smc_type_v2 = SMC_TYPE_B;
1520
1521         /* get vlan id from IP device */
1522         if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
1523                 ini->smcd_version &= ~SMC_V1;
1524                 ini->smcr_version = 0;
1525                 ini->smc_type_v1 = SMC_TYPE_N;
1526                 if (!ini->smcd_version) {
1527                         rc = SMC_CLC_DECL_GETVLANERR;
1528                         goto fallback;
1529                 }
1530         }
1531
1532         rc = smc_find_proposal_devices(smc, ini);
1533         if (rc)
1534                 goto fallback;
1535
1536         buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1537         if (!buf) {
1538                 rc = SMC_CLC_DECL_MEM;
1539                 goto fallback;
1540         }
1541         aclc = (struct smc_clc_msg_accept_confirm *)buf;
1542
1543         /* perform CLC handshake */
1544         rc = smc_connect_clc(smc, aclc, ini);
1545         if (rc) {
1546                 /* -EAGAIN on timeout, see tcp_recvmsg() */
1547                 if (rc == -EAGAIN) {
1548                         rc = -ETIMEDOUT;
1549                         smc->sk.sk_err = ETIMEDOUT;
1550                 }
1551                 goto vlan_cleanup;
1552         }
1553
1554         /* check if smc modes and versions of CLC proposal and accept match */
1555         rc = smc_connect_check_aclc(ini, aclc);
1556         version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1557         if (rc)
1558                 goto vlan_cleanup;
1559
1560         /* depending on previous steps, connect using rdma or ism */
1561         if (aclc->hdr.typev1 == SMC_TYPE_R) {
1562                 ini->smcr_version = version;
1563                 rc = smc_connect_rdma(smc, aclc, ini);
1564         } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1565                 ini->smcd_version = version;
1566                 rc = smc_connect_ism(smc, aclc, ini);
1567         }
1568         if (rc)
1569                 goto vlan_cleanup;
1570
1571         SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1572         smc_connect_ism_vlan_cleanup(smc, ini);
1573         kfree(buf);
1574         kfree(ini);
1575         return 0;
1576
1577 vlan_cleanup:
1578         smc_connect_ism_vlan_cleanup(smc, ini);
1579         kfree(buf);
1580 fallback:
1581         kfree(ini);
1582         return smc_connect_decline_fallback(smc, rc, version);
1583 }
1584
1585 static void smc_connect_work(struct work_struct *work)
1586 {
1587         struct smc_sock *smc = container_of(work, struct smc_sock,
1588                                             connect_work);
1589         long timeo = smc->sk.sk_sndtimeo;
1590         int rc = 0;
1591
1592         if (!timeo)
1593                 timeo = MAX_SCHEDULE_TIMEOUT;
1594         lock_sock(smc->clcsock->sk);
1595         if (smc->clcsock->sk->sk_err) {
1596                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1597         } else if ((1 << smc->clcsock->sk->sk_state) &
1598                                         (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1599                 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1600                 if ((rc == -EPIPE) &&
1601                     ((1 << smc->clcsock->sk->sk_state) &
1602                                         (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1603                         rc = 0;
1604         }
1605         release_sock(smc->clcsock->sk);
1606         lock_sock(&smc->sk);
1607         if (rc != 0 || smc->sk.sk_err) {
1608                 smc->sk.sk_state = SMC_CLOSED;
1609                 if (rc == -EPIPE || rc == -EAGAIN)
1610                         smc->sk.sk_err = EPIPE;
1611                 else if (rc == -ECONNREFUSED)
1612                         smc->sk.sk_err = ECONNREFUSED;
1613                 else if (signal_pending(current))
1614                         smc->sk.sk_err = -sock_intr_errno(timeo);
1615                 sock_put(&smc->sk); /* passive closing */
1616                 goto out;
1617         }
1618
1619         rc = __smc_connect(smc);
1620         if (rc < 0)
1621                 smc->sk.sk_err = -rc;
1622
1623 out:
1624         if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1625                 if (smc->sk.sk_err) {
1626                         smc->sk.sk_state_change(&smc->sk);
1627                 } else { /* allow polling before and after fallback decision */
1628                         smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1629                         smc->sk.sk_write_space(&smc->sk);
1630                 }
1631         }
1632         release_sock(&smc->sk);
1633 }
1634
1635 int smc_connect(struct socket *sock, struct sockaddr *addr,
1636                 int alen, int flags)
1637 {
1638         struct sock *sk = sock->sk;
1639         struct smc_sock *smc;
1640         int rc = -EINVAL;
1641
1642         smc = smc_sk(sk);
1643
1644         /* separate smc parameter checking to be safe */
1645         if (alen < sizeof(addr->sa_family))
1646                 goto out_err;
1647         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1648                 goto out_err;
1649
1650         lock_sock(sk);
1651         switch (sock->state) {
1652         default:
1653                 rc = -EINVAL;
1654                 goto out;
1655         case SS_CONNECTED:
1656                 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1657                 goto out;
1658         case SS_CONNECTING:
1659                 if (sk->sk_state == SMC_ACTIVE)
1660                         goto connected;
1661                 break;
1662         case SS_UNCONNECTED:
1663                 sock->state = SS_CONNECTING;
1664                 break;
1665         }
1666
1667         switch (sk->sk_state) {
1668         default:
1669                 goto out;
1670         case SMC_CLOSED:
1671                 rc = sock_error(sk) ? : -ECONNABORTED;
1672                 sock->state = SS_UNCONNECTED;
1673                 goto out;
1674         case SMC_ACTIVE:
1675                 rc = -EISCONN;
1676                 goto out;
1677         case SMC_INIT:
1678                 break;
1679         }
1680
1681         smc_copy_sock_settings_to_clc(smc);
1682         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1683         if (smc->connect_nonblock) {
1684                 rc = -EALREADY;
1685                 goto out;
1686         }
1687         rc = kernel_connect(smc->clcsock, addr, alen, flags);
1688         if (rc && rc != -EINPROGRESS)
1689                 goto out;
1690
1691         if (smc->use_fallback) {
1692                 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
1693                 goto out;
1694         }
1695         sock_hold(&smc->sk); /* sock put in passive closing */
1696         if (flags & O_NONBLOCK) {
1697                 if (queue_work(smc_hs_wq, &smc->connect_work))
1698                         smc->connect_nonblock = 1;
1699                 rc = -EINPROGRESS;
1700                 goto out;
1701         } else {
1702                 rc = __smc_connect(smc);
1703                 if (rc < 0)
1704                         goto out;
1705         }
1706
1707 connected:
1708         rc = 0;
1709         sock->state = SS_CONNECTED;
1710 out:
1711         release_sock(sk);
1712 out_err:
1713         return rc;
1714 }
1715
1716 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1717 {
1718         struct socket *new_clcsock = NULL;
1719         struct sock *lsk = &lsmc->sk;
1720         struct sock *new_sk;
1721         int rc = -EINVAL;
1722
1723         release_sock(lsk);
1724         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1725         if (!new_sk) {
1726                 rc = -ENOMEM;
1727                 lsk->sk_err = ENOMEM;
1728                 *new_smc = NULL;
1729                 lock_sock(lsk);
1730                 goto out;
1731         }
1732         *new_smc = smc_sk(new_sk);
1733
1734         mutex_lock(&lsmc->clcsock_release_lock);
1735         if (lsmc->clcsock)
1736                 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1737         mutex_unlock(&lsmc->clcsock_release_lock);
1738         lock_sock(lsk);
1739         if  (rc < 0 && rc != -EAGAIN)
1740                 lsk->sk_err = -rc;
1741         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1742                 new_sk->sk_prot->unhash(new_sk);
1743                 if (new_clcsock)
1744                         sock_release(new_clcsock);
1745                 new_sk->sk_state = SMC_CLOSED;
1746                 smc_sock_set_flag(new_sk, SOCK_DEAD);
1747                 sock_put(new_sk); /* final */
1748                 *new_smc = NULL;
1749                 goto out;
1750         }
1751
1752         /* new clcsock has inherited the smc listen-specific sk_data_ready
1753          * function; switch it back to the original sk_data_ready function
1754          */
1755         new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1756
1757         /* if new clcsock has also inherited the fallback-specific callback
1758          * functions, switch them back to the original ones.
1759          */
1760         if (lsmc->use_fallback) {
1761                 if (lsmc->clcsk_state_change)
1762                         new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1763                 if (lsmc->clcsk_write_space)
1764                         new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1765                 if (lsmc->clcsk_error_report)
1766                         new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1767         }
1768
1769         (*new_smc)->clcsock = new_clcsock;
1770 out:
1771         return rc;
1772 }
1773
1774 /* add a just created sock to the accept queue of the listen sock as
1775  * candidate for a following socket accept call from user space
1776  */
1777 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1778 {
1779         struct smc_sock *par = smc_sk(parent);
1780
1781         sock_hold(sk); /* sock_put in smc_accept_unlink () */
1782         spin_lock(&par->accept_q_lock);
1783         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1784         spin_unlock(&par->accept_q_lock);
1785         sk_acceptq_added(parent);
1786 }
1787
1788 /* remove a socket from the accept queue of its parental listening socket */
1789 static void smc_accept_unlink(struct sock *sk)
1790 {
1791         struct smc_sock *par = smc_sk(sk)->listen_smc;
1792
1793         spin_lock(&par->accept_q_lock);
1794         list_del_init(&smc_sk(sk)->accept_q);
1795         spin_unlock(&par->accept_q_lock);
1796         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1797         sock_put(sk); /* sock_hold in smc_accept_enqueue */
1798 }
1799
1800 /* remove a sock from the accept queue to bind it to a new socket created
1801  * for a socket accept call from user space
1802  */
1803 struct sock *smc_accept_dequeue(struct sock *parent,
1804                                 struct socket *new_sock)
1805 {
1806         struct smc_sock *isk, *n;
1807         struct sock *new_sk;
1808
1809         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1810                 new_sk = (struct sock *)isk;
1811
1812                 smc_accept_unlink(new_sk);
1813                 if (new_sk->sk_state == SMC_CLOSED) {
1814                         new_sk->sk_prot->unhash(new_sk);
1815                         if (isk->clcsock) {
1816                                 sock_release(isk->clcsock);
1817                                 isk->clcsock = NULL;
1818                         }
1819                         sock_put(new_sk); /* final */
1820                         continue;
1821                 }
1822                 if (new_sock) {
1823                         sock_graft(new_sk, new_sock);
1824                         new_sock->state = SS_CONNECTED;
1825                         if (isk->use_fallback) {
1826                                 smc_sk(new_sk)->clcsock->file = new_sock->file;
1827                                 isk->clcsock->file->private_data = isk->clcsock;
1828                         }
1829                 }
1830                 return new_sk;
1831         }
1832         return NULL;
1833 }
1834
1835 /* clean up for a created but never accepted sock */
1836 void smc_close_non_accepted(struct sock *sk)
1837 {
1838         struct smc_sock *smc = smc_sk(sk);
1839
1840         sock_hold(sk); /* sock_put below */
1841         lock_sock(sk);
1842         if (!sk->sk_lingertime)
1843                 /* wait for peer closing */
1844                 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);
1845         __smc_release(smc);
1846         release_sock(sk);
1847         sock_put(sk); /* sock_hold above */
1848         sock_put(sk); /* final sock_put */
1849 }
1850
1851 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1852 {
1853         struct smc_link *link = smc->conn.lnk;
1854         struct smc_llc_qentry *qentry;
1855         int rc;
1856
1857         /* reg the sndbuf if it was vzalloced*/
1858         if (smc->conn.sndbuf_desc->is_vm) {
1859                 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
1860                         return SMC_CLC_DECL_ERR_REGBUF;
1861         }
1862
1863         /* reg the rmb */
1864         if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
1865                 return SMC_CLC_DECL_ERR_REGBUF;
1866
1867         /* send CONFIRM LINK request to client over the RoCE fabric */
1868         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1869         if (rc < 0)
1870                 return SMC_CLC_DECL_TIMEOUT_CL;
1871
1872         /* receive CONFIRM LINK response from client over the RoCE fabric */
1873         qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1874                               SMC_LLC_CONFIRM_LINK);
1875         if (!qentry) {
1876                 struct smc_clc_msg_decline dclc;
1877
1878                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1879                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1880                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1881         }
1882         smc_llc_save_peer_uid(qentry);
1883         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1884         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1885         if (rc)
1886                 return SMC_CLC_DECL_RMBE_EC;
1887
1888         /* confirm_rkey is implicit on 1st contact */
1889         smc->conn.rmb_desc->is_conf_rkey = true;
1890
1891         smc_llc_link_active(link);
1892         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1893
1894         if (link->lgr->max_links > 1) {
1895                 down_write(&link->lgr->llc_conf_mutex);
1896                 /* initial contact - try to establish second link */
1897                 smc_llc_srv_add_link(link, NULL);
1898                 up_write(&link->lgr->llc_conf_mutex);
1899         }
1900         return 0;
1901 }
1902
1903 /* listen worker: finish */
1904 static void smc_listen_out(struct smc_sock *new_smc)
1905 {
1906         struct smc_sock *lsmc = new_smc->listen_smc;
1907         struct sock *newsmcsk = &new_smc->sk;
1908
1909         if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1910                 atomic_dec(&lsmc->queued_smc_hs);
1911
1912         if (lsmc->sk.sk_state == SMC_LISTEN) {
1913                 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1914                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1915                 release_sock(&lsmc->sk);
1916         } else { /* no longer listening */
1917                 smc_close_non_accepted(newsmcsk);
1918         }
1919
1920         /* Wake up accept */
1921         lsmc->sk.sk_data_ready(&lsmc->sk);
1922         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1923 }
1924
1925 /* listen worker: finish in state connected */
1926 static void smc_listen_out_connected(struct smc_sock *new_smc)
1927 {
1928         struct sock *newsmcsk = &new_smc->sk;
1929
1930         if (newsmcsk->sk_state == SMC_INIT)
1931                 newsmcsk->sk_state = SMC_ACTIVE;
1932
1933         smc_listen_out(new_smc);
1934 }
1935
1936 /* listen worker: finish in error state */
1937 static void smc_listen_out_err(struct smc_sock *new_smc)
1938 {
1939         struct sock *newsmcsk = &new_smc->sk;
1940         struct net *net = sock_net(newsmcsk);
1941
1942         this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1943         if (newsmcsk->sk_state == SMC_INIT)
1944                 sock_put(&new_smc->sk); /* passive closing */
1945         newsmcsk->sk_state = SMC_CLOSED;
1946
1947         smc_listen_out(new_smc);
1948 }
1949
1950 /* listen worker: decline and fall back if possible */
1951 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1952                                int local_first, u8 version)
1953 {
1954         /* RDMA setup failed, switch back to TCP */
1955         smc_conn_abort(new_smc, local_first);
1956         if (reason_code < 0 ||
1957             smc_switch_to_fallback(new_smc, reason_code)) {
1958                 /* error, no fallback possible */
1959                 smc_listen_out_err(new_smc);
1960                 return;
1961         }
1962         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1963                 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1964                         smc_listen_out_err(new_smc);
1965                         return;
1966                 }
1967         }
1968         smc_listen_out_connected(new_smc);
1969 }
1970
1971 /* listen worker: version checking */
1972 static int smc_listen_v2_check(struct smc_sock *new_smc,
1973                                struct smc_clc_msg_proposal *pclc,
1974                                struct smc_init_info *ini)
1975 {
1976         struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1977         struct smc_clc_v2_extension *pclc_v2_ext;
1978         int rc = SMC_CLC_DECL_PEERNOSMC;
1979
1980         ini->smc_type_v1 = pclc->hdr.typev1;
1981         ini->smc_type_v2 = pclc->hdr.typev2;
1982         ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1983         ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1984         if (pclc->hdr.version > SMC_V1) {
1985                 if (smcd_indicated(ini->smc_type_v2))
1986                         ini->smcd_version |= SMC_V2;
1987                 if (smcr_indicated(ini->smc_type_v2))
1988                         ini->smcr_version |= SMC_V2;
1989         }
1990         if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1991                 rc = SMC_CLC_DECL_PEERNOSMC;
1992                 goto out;
1993         }
1994         pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1995         if (!pclc_v2_ext) {
1996                 ini->smcd_version &= ~SMC_V2;
1997                 ini->smcr_version &= ~SMC_V2;
1998                 rc = SMC_CLC_DECL_NOV2EXT;
1999                 goto out;
2000         }
2001         pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
2002         if (ini->smcd_version & SMC_V2) {
2003                 if (!smc_ism_is_v2_capable()) {
2004                         ini->smcd_version &= ~SMC_V2;
2005                         rc = SMC_CLC_DECL_NOISM2SUPP;
2006                 } else if (!pclc_smcd_v2_ext) {
2007                         ini->smcd_version &= ~SMC_V2;
2008                         rc = SMC_CLC_DECL_NOV2DEXT;
2009                 } else if (!pclc_v2_ext->hdr.eid_cnt &&
2010                            !pclc_v2_ext->hdr.flag.seid) {
2011                         ini->smcd_version &= ~SMC_V2;
2012                         rc = SMC_CLC_DECL_NOUEID;
2013                 }
2014         }
2015         if (ini->smcr_version & SMC_V2) {
2016                 if (!pclc_v2_ext->hdr.eid_cnt) {
2017                         ini->smcr_version &= ~SMC_V2;
2018                         rc = SMC_CLC_DECL_NOUEID;
2019                 }
2020         }
2021
2022         ini->release_nr = pclc_v2_ext->hdr.flag.release;
2023         if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
2024                 ini->release_nr = SMC_RELEASE;
2025
2026 out:
2027         if (!ini->smcd_version && !ini->smcr_version)
2028                 return rc;
2029
2030         return 0;
2031 }
2032
2033 /* listen worker: check prefixes */
2034 static int smc_listen_prfx_check(struct smc_sock *new_smc,
2035                                  struct smc_clc_msg_proposal *pclc)
2036 {
2037         struct smc_clc_msg_proposal_prefix *pclc_prfx;
2038         struct socket *newclcsock = new_smc->clcsock;
2039
2040         if (pclc->hdr.typev1 == SMC_TYPE_N)
2041                 return 0;
2042         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
2043         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
2044                 return SMC_CLC_DECL_DIFFPREFIX;
2045
2046         return 0;
2047 }
2048
2049 /* listen worker: initialize connection and buffers */
2050 static int smc_listen_rdma_init(struct smc_sock *new_smc,
2051                                 struct smc_init_info *ini)
2052 {
2053         int rc;
2054
2055         /* allocate connection / link group */
2056         rc = smc_conn_create(new_smc, ini);
2057         if (rc)
2058                 return rc;
2059
2060         /* create send buffer and rmb */
2061         if (smc_buf_create(new_smc, false)) {
2062                 smc_conn_abort(new_smc, ini->first_contact_local);
2063                 return SMC_CLC_DECL_MEM;
2064         }
2065
2066         return 0;
2067 }
2068
2069 /* listen worker: initialize connection and buffers for SMC-D */
2070 static int smc_listen_ism_init(struct smc_sock *new_smc,
2071                                struct smc_init_info *ini)
2072 {
2073         int rc;
2074
2075         rc = smc_conn_create(new_smc, ini);
2076         if (rc)
2077                 return rc;
2078
2079         /* Create send and receive buffers */
2080         rc = smc_buf_create(new_smc, true);
2081         if (rc) {
2082                 smc_conn_abort(new_smc, ini->first_contact_local);
2083                 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
2084                                          SMC_CLC_DECL_MEM;
2085         }
2086
2087         return 0;
2088 }
2089
2090 static bool smc_is_already_selected(struct smcd_dev *smcd,
2091                                     struct smc_init_info *ini,
2092                                     int matches)
2093 {
2094         int i;
2095
2096         for (i = 0; i < matches; i++)
2097                 if (smcd == ini->ism_dev[i])
2098                         return true;
2099
2100         return false;
2101 }
2102
2103 /* check for ISM devices matching proposed ISM devices */
2104 static void smc_check_ism_v2_match(struct smc_init_info *ini,
2105                                    u16 proposed_chid,
2106                                    struct smcd_gid *proposed_gid,
2107                                    unsigned int *matches)
2108 {
2109         struct smcd_dev *smcd;
2110
2111         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2112                 if (smcd->going_away)
2113                         continue;
2114                 if (smc_is_already_selected(smcd, ini, *matches))
2115                         continue;
2116                 if (smc_ism_get_chid(smcd) == proposed_chid &&
2117                     !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
2118                         ini->ism_peer_gid[*matches].gid = proposed_gid->gid;
2119                         if (__smc_ism_is_emulated(proposed_chid))
2120                                 ini->ism_peer_gid[*matches].gid_ext =
2121                                                         proposed_gid->gid_ext;
2122                                 /* non-Emulated-ISM's peer gid_ext remains 0. */
2123                         ini->ism_dev[*matches] = smcd;
2124                         (*matches)++;
2125                         break;
2126                 }
2127         }
2128 }
2129
2130 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2131 {
2132         if (!ini->rc)
2133                 ini->rc = rc;
2134 }
2135
2136 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2137                                         struct smc_clc_msg_proposal *pclc,
2138                                         struct smc_init_info *ini)
2139 {
2140         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2141         struct smc_clc_v2_extension *smc_v2_ext;
2142         struct smc_clc_msg_smcd *pclc_smcd;
2143         unsigned int matches = 0;
2144         struct smcd_gid smcd_gid;
2145         u8 smcd_version;
2146         u8 *eid = NULL;
2147         int i, rc;
2148         u16 chid;
2149
2150         if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
2151                 goto not_found;
2152
2153         pclc_smcd = smc_get_clc_msg_smcd(pclc);
2154         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2155         smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
2156
2157         mutex_lock(&smcd_dev_list.mutex);
2158         if (pclc_smcd->ism.chid) {
2159                 /* check for ISM device matching proposed native ISM device */
2160                 smcd_gid.gid = ntohll(pclc_smcd->ism.gid);
2161                 smcd_gid.gid_ext = 0;
2162                 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2163                                        &smcd_gid, &matches);
2164         }
2165         for (i = 0; i < smc_v2_ext->hdr.ism_gid_cnt; i++) {
2166                 /* check for ISM devices matching proposed non-native ISM
2167                  * devices
2168                  */
2169                 smcd_gid.gid = ntohll(smcd_v2_ext->gidchid[i].gid);
2170                 smcd_gid.gid_ext = 0;
2171                 chid = ntohs(smcd_v2_ext->gidchid[i].chid);
2172                 if (__smc_ism_is_emulated(chid)) {
2173                         if ((i + 1) == smc_v2_ext->hdr.ism_gid_cnt ||
2174                             chid != ntohs(smcd_v2_ext->gidchid[i + 1].chid))
2175                                 /* each Emulated-ISM device takes two GID-CHID
2176                                  * entries and CHID of the second entry repeats
2177                                  * that of the first entry.
2178                                  *
2179                                  * So check if the next GID-CHID entry exists
2180                                  * and both two entries' CHIDs are the same.
2181                                  */
2182                                 continue;
2183                         smcd_gid.gid_ext =
2184                                 ntohll(smcd_v2_ext->gidchid[++i].gid);
2185                 }
2186                 smc_check_ism_v2_match(ini, chid, &smcd_gid, &matches);
2187         }
2188         mutex_unlock(&smcd_dev_list.mutex);
2189
2190         if (!ini->ism_dev[0]) {
2191                 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
2192                 goto not_found;
2193         }
2194
2195         smc_ism_get_system_eid(&eid);
2196         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2197                                smcd_v2_ext->system_eid, eid))
2198                 goto not_found;
2199
2200         /* separate - outside the smcd_dev_list.lock */
2201         smcd_version = ini->smcd_version;
2202         for (i = 0; i < matches; i++) {
2203                 ini->smcd_version = SMC_V2;
2204                 ini->is_smcd = true;
2205                 ini->ism_selected = i;
2206                 rc = smc_listen_ism_init(new_smc, ini);
2207                 if (rc) {
2208                         smc_find_ism_store_rc(rc, ini);
2209                         /* try next active ISM device */
2210                         continue;
2211                 }
2212                 return; /* matching and usable V2 ISM device found */
2213         }
2214         /* no V2 ISM device could be initialized */
2215         ini->smcd_version = smcd_version;       /* restore original value */
2216         ini->negotiated_eid[0] = 0;
2217
2218 not_found:
2219         ini->smcd_version &= ~SMC_V2;
2220         ini->ism_dev[0] = NULL;
2221         ini->is_smcd = false;
2222 }
2223
2224 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2225                                         struct smc_clc_msg_proposal *pclc,
2226                                         struct smc_init_info *ini)
2227 {
2228         struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
2229         int rc = 0;
2230
2231         /* check if ISM V1 is available */
2232         if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
2233                 goto not_found;
2234         ini->is_smcd = true; /* prepare ISM check */
2235         ini->ism_peer_gid[0].gid = ntohll(pclc_smcd->ism.gid);
2236         ini->ism_peer_gid[0].gid_ext = 0;
2237         rc = smc_find_ism_device(new_smc, ini);
2238         if (rc)
2239                 goto not_found;
2240         ini->ism_selected = 0;
2241         rc = smc_listen_ism_init(new_smc, ini);
2242         if (!rc)
2243                 return;         /* V1 ISM device found */
2244
2245 not_found:
2246         smc_find_ism_store_rc(rc, ini);
2247         ini->smcd_version &= ~SMC_V1;
2248         ini->ism_dev[0] = NULL;
2249         ini->is_smcd = false;
2250 }
2251
2252 /* listen worker: register buffers */
2253 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
2254 {
2255         struct smc_connection *conn = &new_smc->conn;
2256
2257         if (!local_first) {
2258                 /* reg sendbufs if they were vzalloced */
2259                 if (conn->sndbuf_desc->is_vm) {
2260                         if (smcr_lgr_reg_sndbufs(conn->lnk,
2261                                                  conn->sndbuf_desc))
2262                                 return SMC_CLC_DECL_ERR_REGBUF;
2263                 }
2264                 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
2265                         return SMC_CLC_DECL_ERR_REGBUF;
2266         }
2267
2268         return 0;
2269 }
2270
2271 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2272                                          struct smc_clc_msg_proposal *pclc,
2273                                          struct smc_init_info *ini)
2274 {
2275         struct smc_clc_v2_extension *smc_v2_ext;
2276         u8 smcr_version;
2277         int rc;
2278
2279         if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2280                 goto not_found;
2281
2282         smc_v2_ext = smc_get_clc_v2_ext(pclc);
2283         if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2284                 goto not_found;
2285
2286         /* prepare RDMA check */
2287         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2288         memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2289         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2290         ini->check_smcrv2 = true;
2291         ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2292         ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2293         ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2294         rc = smc_find_rdma_device(new_smc, ini);
2295         if (rc) {
2296                 smc_find_ism_store_rc(rc, ini);
2297                 goto not_found;
2298         }
2299         if (!ini->smcrv2.uses_gateway)
2300                 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2301
2302         smcr_version = ini->smcr_version;
2303         ini->smcr_version = SMC_V2;
2304         rc = smc_listen_rdma_init(new_smc, ini);
2305         if (!rc) {
2306                 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2307                 if (rc)
2308                         smc_conn_abort(new_smc, ini->first_contact_local);
2309         }
2310         if (!rc)
2311                 return;
2312         ini->smcr_version = smcr_version;
2313         smc_find_ism_store_rc(rc, ini);
2314
2315 not_found:
2316         ini->smcr_version &= ~SMC_V2;
2317         ini->smcrv2.ib_dev_v2 = NULL;
2318         ini->check_smcrv2 = false;
2319 }
2320
2321 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2322                                         struct smc_clc_msg_proposal *pclc,
2323                                         struct smc_init_info *ini)
2324 {
2325         int rc;
2326
2327         if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
2328                 return SMC_CLC_DECL_NOSMCDEV;
2329
2330         /* prepare RDMA check */
2331         memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2332         memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2333         memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2334         rc = smc_find_rdma_device(new_smc, ini);
2335         if (rc) {
2336                 /* no RDMA device found */
2337                 return SMC_CLC_DECL_NOSMCDEV;
2338         }
2339         rc = smc_listen_rdma_init(new_smc, ini);
2340         if (rc)
2341                 return rc;
2342         return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2343 }
2344
2345 /* determine the local device matching to proposal */
2346 static int smc_listen_find_device(struct smc_sock *new_smc,
2347                                   struct smc_clc_msg_proposal *pclc,
2348                                   struct smc_init_info *ini)
2349 {
2350         int prfx_rc;
2351
2352         /* check for ISM device matching V2 proposed device */
2353         smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2354         if (ini->ism_dev[0])
2355                 return 0;
2356
2357         /* check for matching IP prefix and subnet length (V1) */
2358         prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2359         if (prfx_rc)
2360                 smc_find_ism_store_rc(prfx_rc, ini);
2361
2362         /* get vlan id from IP device */
2363         if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
2364                 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
2365
2366         /* check for ISM device matching V1 proposed device */
2367         if (!prfx_rc)
2368                 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
2369         if (ini->ism_dev[0])
2370                 return 0;
2371
2372         if (!smcr_indicated(pclc->hdr.typev1) &&
2373             !smcr_indicated(pclc->hdr.typev2))
2374                 /* skip RDMA and decline */
2375                 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
2376
2377         /* check if RDMA V2 is available */
2378         smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2379         if (ini->smcrv2.ib_dev_v2)
2380                 return 0;
2381
2382         /* check if RDMA V1 is available */
2383         if (!prfx_rc) {
2384                 int rc;
2385
2386                 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2387                 smc_find_ism_store_rc(rc, ini);
2388                 return (!rc) ? 0 : ini->rc;
2389         }
2390         return prfx_rc;
2391 }
2392
2393 /* listen worker: finish RDMA setup */
2394 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2395                                   struct smc_clc_msg_accept_confirm *cclc,
2396                                   bool local_first,
2397                                   struct smc_init_info *ini)
2398 {
2399         struct smc_link *link = new_smc->conn.lnk;
2400         int reason_code = 0;
2401
2402         if (local_first)
2403                 smc_link_save_peer_info(link, cclc, ini);
2404
2405         if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2406                 return SMC_CLC_DECL_ERR_RTOK;
2407
2408         if (local_first) {
2409                 if (smc_ib_ready_link(link))
2410                         return SMC_CLC_DECL_ERR_RDYLNK;
2411                 /* QP confirmation over RoCE fabric */
2412                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
2413                 reason_code = smcr_serv_conf_first_link(new_smc);
2414                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
2415         }
2416         return reason_code;
2417 }
2418
2419 /* setup for connection of server */
2420 static void smc_listen_work(struct work_struct *work)
2421 {
2422         struct smc_sock *new_smc = container_of(work, struct smc_sock,
2423                                                 smc_listen_work);
2424         struct socket *newclcsock = new_smc->clcsock;
2425         struct smc_clc_msg_accept_confirm *cclc;
2426         struct smc_clc_msg_proposal_area *buf;
2427         struct smc_clc_msg_proposal *pclc;
2428         struct smc_init_info *ini = NULL;
2429         u8 proposal_version = SMC_V1;
2430         u8 accept_version;
2431         int rc = 0;
2432
2433         if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2434                 return smc_listen_out_err(new_smc);
2435
2436         if (new_smc->use_fallback) {
2437                 smc_listen_out_connected(new_smc);
2438                 return;
2439         }
2440
2441         /* check if peer is smc capable */
2442         if (!tcp_sk(newclcsock->sk)->syn_smc) {
2443                 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2444                 if (rc)
2445                         smc_listen_out_err(new_smc);
2446                 else
2447                         smc_listen_out_connected(new_smc);
2448                 return;
2449         }
2450
2451         /* do inband token exchange -
2452          * wait for and receive SMC Proposal CLC message
2453          */
2454         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2455         if (!buf) {
2456                 rc = SMC_CLC_DECL_MEM;
2457                 goto out_decl;
2458         }
2459         pclc = (struct smc_clc_msg_proposal *)buf;
2460         rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
2461                               SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
2462         if (rc)
2463                 goto out_decl;
2464
2465         if (pclc->hdr.version > SMC_V1)
2466                 proposal_version = SMC_V2;
2467
2468         /* IPSec connections opt out of SMC optimizations */
2469         if (using_ipsec(new_smc)) {
2470                 rc = SMC_CLC_DECL_IPSEC;
2471                 goto out_decl;
2472         }
2473
2474         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2475         if (!ini) {
2476                 rc = SMC_CLC_DECL_MEM;
2477                 goto out_decl;
2478         }
2479
2480         /* initial version checking */
2481         rc = smc_listen_v2_check(new_smc, pclc, ini);
2482         if (rc)
2483                 goto out_decl;
2484
2485         rc = smc_clc_srv_v2x_features_validate(new_smc, pclc, ini);
2486         if (rc)
2487                 goto out_decl;
2488
2489         mutex_lock(&smc_server_lgr_pending);
2490         smc_close_init(new_smc);
2491         smc_rx_init(new_smc);
2492         smc_tx_init(new_smc);
2493
2494         /* determine ISM or RoCE device used for connection */
2495         rc = smc_listen_find_device(new_smc, pclc, ini);
2496         if (rc)
2497                 goto out_unlock;
2498
2499         /* send SMC Accept CLC message */
2500         accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
2501         rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
2502                                  accept_version, ini->negotiated_eid, ini);
2503         if (rc)
2504                 goto out_unlock;
2505
2506         /* SMC-D does not need this lock any more */
2507         if (ini->is_smcd)
2508                 mutex_unlock(&smc_server_lgr_pending);
2509
2510         /* receive SMC Confirm CLC message */
2511         memset(buf, 0, sizeof(*buf));
2512         cclc = (struct smc_clc_msg_accept_confirm *)buf;
2513         rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
2514                               SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2515         if (rc) {
2516                 if (!ini->is_smcd)
2517                         goto out_unlock;
2518                 goto out_decl;
2519         }
2520
2521         rc = smc_clc_v2x_features_confirm_check(cclc, ini);
2522         if (rc) {
2523                 if (!ini->is_smcd)
2524                         goto out_unlock;
2525                 goto out_decl;
2526         }
2527
2528         /* fce smc release version is needed in smc_listen_rdma_finish,
2529          * so save fce info here.
2530          */
2531         smc_conn_save_peer_info_fce(new_smc, cclc);
2532
2533         /* finish worker */
2534         if (!ini->is_smcd) {
2535                 rc = smc_listen_rdma_finish(new_smc, cclc,
2536                                             ini->first_contact_local, ini);
2537                 if (rc)
2538                         goto out_unlock;
2539                 mutex_unlock(&smc_server_lgr_pending);
2540         }
2541         smc_conn_save_peer_info(new_smc, cclc);
2542
2543         if (ini->is_smcd &&
2544             smc_ism_support_dmb_nocopy(new_smc->conn.lgr->smcd)) {
2545                 rc = smcd_buf_attach(new_smc);
2546                 if (rc)
2547                         goto out_decl;
2548         }
2549
2550         smc_listen_out_connected(new_smc);
2551         SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
2552         goto out_free;
2553
2554 out_unlock:
2555         mutex_unlock(&smc_server_lgr_pending);
2556 out_decl:
2557         smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
2558                            proposal_version);
2559 out_free:
2560         kfree(ini);
2561         kfree(buf);
2562 }
2563
2564 static void smc_tcp_listen_work(struct work_struct *work)
2565 {
2566         struct smc_sock *lsmc = container_of(work, struct smc_sock,
2567                                              tcp_listen_work);
2568         struct sock *lsk = &lsmc->sk;
2569         struct smc_sock *new_smc;
2570         int rc = 0;
2571
2572         lock_sock(lsk);
2573         while (lsk->sk_state == SMC_LISTEN) {
2574                 rc = smc_clcsock_accept(lsmc, &new_smc);
2575                 if (rc) /* clcsock accept queue empty or error */
2576                         goto out;
2577                 if (!new_smc)
2578                         continue;
2579
2580                 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2581                         atomic_inc(&lsmc->queued_smc_hs);
2582
2583                 new_smc->listen_smc = lsmc;
2584                 new_smc->use_fallback = lsmc->use_fallback;
2585                 new_smc->fallback_rsn = lsmc->fallback_rsn;
2586                 sock_hold(lsk); /* sock_put in smc_listen_work */
2587                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2588                 smc_copy_sock_settings_to_smc(new_smc);
2589                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
2590                 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
2591                         sock_put(&new_smc->sk);
2592         }
2593
2594 out:
2595         release_sock(lsk);
2596         sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2597 }
2598
2599 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2600 {
2601         struct smc_sock *lsmc;
2602
2603         read_lock_bh(&listen_clcsock->sk_callback_lock);
2604         lsmc = smc_clcsock_user_data(listen_clcsock);
2605         if (!lsmc)
2606                 goto out;
2607         lsmc->clcsk_data_ready(listen_clcsock);
2608         if (lsmc->sk.sk_state == SMC_LISTEN) {
2609                 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
2610                 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
2611                         sock_put(&lsmc->sk);
2612         }
2613 out:
2614         read_unlock_bh(&listen_clcsock->sk_callback_lock);
2615 }
2616
2617 int smc_listen(struct socket *sock, int backlog)
2618 {
2619         struct sock *sk = sock->sk;
2620         struct smc_sock *smc;
2621         int rc;
2622
2623         smc = smc_sk(sk);
2624         lock_sock(sk);
2625
2626         rc = -EINVAL;
2627         if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2628             smc->connect_nonblock || sock->state != SS_UNCONNECTED)
2629                 goto out;
2630
2631         rc = 0;
2632         if (sk->sk_state == SMC_LISTEN) {
2633                 sk->sk_max_ack_backlog = backlog;
2634                 goto out;
2635         }
2636         /* some socket options are handled in core, so we could not apply
2637          * them to the clc socket -- copy smc socket options to clc socket
2638          */
2639         smc_copy_sock_settings_to_clc(smc);
2640         if (!smc->use_fallback)
2641                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
2642
2643         /* save original sk_data_ready function and establish
2644          * smc-specific sk_data_ready function
2645          */
2646         write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2647         smc->clcsock->sk->sk_user_data =
2648                 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
2649         smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2650                                smc_clcsock_data_ready, &smc->clcsk_data_ready);
2651         write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2652
2653         /* save original ops */
2654         smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2655
2656         smc->af_ops = *smc->ori_af_ops;
2657         smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2658
2659         inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2660
2661         if (smc->limit_smc_hs)
2662                 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
2663
2664         rc = kernel_listen(smc->clcsock, backlog);
2665         if (rc) {
2666                 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2667                 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2668                                        &smc->clcsk_data_ready);
2669                 smc->clcsock->sk->sk_user_data = NULL;
2670                 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2671                 goto out;
2672         }
2673         sk->sk_max_ack_backlog = backlog;
2674         sk->sk_ack_backlog = 0;
2675         sk->sk_state = SMC_LISTEN;
2676
2677 out:
2678         release_sock(sk);
2679         return rc;
2680 }
2681
2682 int smc_accept(struct socket *sock, struct socket *new_sock,
2683                struct proto_accept_arg *arg)
2684 {
2685         struct sock *sk = sock->sk, *nsk;
2686         DECLARE_WAITQUEUE(wait, current);
2687         struct smc_sock *lsmc;
2688         long timeo;
2689         int rc = 0;
2690
2691         lsmc = smc_sk(sk);
2692         sock_hold(sk); /* sock_put below */
2693         lock_sock(sk);
2694
2695         if (lsmc->sk.sk_state != SMC_LISTEN) {
2696                 rc = -EINVAL;
2697                 release_sock(sk);
2698                 goto out;
2699         }
2700
2701         /* Wait for an incoming connection */
2702         timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
2703         add_wait_queue_exclusive(sk_sleep(sk), &wait);
2704         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2705                 set_current_state(TASK_INTERRUPTIBLE);
2706                 if (!timeo) {
2707                         rc = -EAGAIN;
2708                         break;
2709                 }
2710                 release_sock(sk);
2711                 timeo = schedule_timeout(timeo);
2712                 /* wakeup by sk_data_ready in smc_listen_work() */
2713                 sched_annotate_sleep();
2714                 lock_sock(sk);
2715                 if (signal_pending(current)) {
2716                         rc = sock_intr_errno(timeo);
2717                         break;
2718                 }
2719         }
2720         set_current_state(TASK_RUNNING);
2721         remove_wait_queue(sk_sleep(sk), &wait);
2722
2723         if (!rc)
2724                 rc = sock_error(nsk);
2725         release_sock(sk);
2726         if (rc)
2727                 goto out;
2728
2729         if (lsmc->sockopt_defer_accept && !(arg->flags & O_NONBLOCK)) {
2730                 /* wait till data arrives on the socket */
2731                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2732                                                                 MSEC_PER_SEC);
2733                 if (smc_sk(nsk)->use_fallback) {
2734                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2735
2736                         lock_sock(clcsk);
2737                         if (skb_queue_empty(&clcsk->sk_receive_queue))
2738                                 sk_wait_data(clcsk, &timeo, NULL);
2739                         release_sock(clcsk);
2740                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2741                         lock_sock(nsk);
2742                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
2743                         release_sock(nsk);
2744                 }
2745         }
2746
2747 out:
2748         sock_put(sk); /* sock_hold above */
2749         return rc;
2750 }
2751
2752 int smc_getname(struct socket *sock, struct sockaddr *addr,
2753                 int peer)
2754 {
2755         struct smc_sock *smc;
2756
2757         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2758             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2759                 return -ENOTCONN;
2760
2761         smc = smc_sk(sock->sk);
2762
2763         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2764 }
2765
2766 int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2767 {
2768         struct sock *sk = sock->sk;
2769         struct smc_sock *smc;
2770         int rc;
2771
2772         smc = smc_sk(sk);
2773         lock_sock(sk);
2774
2775         /* SMC does not support connect with fastopen */
2776         if (msg->msg_flags & MSG_FASTOPEN) {
2777                 /* not connected yet, fallback */
2778                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2779                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2780                         if (rc)
2781                                 goto out;
2782                 } else {
2783                         rc = -EINVAL;
2784                         goto out;
2785                 }
2786         } else if ((sk->sk_state != SMC_ACTIVE) &&
2787                    (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2788                    (sk->sk_state != SMC_INIT)) {
2789                 rc = -EPIPE;
2790                 goto out;
2791         }
2792
2793         if (smc->use_fallback) {
2794                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2795         } else {
2796                 rc = smc_tx_sendmsg(smc, msg, len);
2797                 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2798         }
2799 out:
2800         release_sock(sk);
2801         return rc;
2802 }
2803
2804 int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2805                 int flags)
2806 {
2807         struct sock *sk = sock->sk;
2808         struct smc_sock *smc;
2809         int rc = -ENOTCONN;
2810
2811         smc = smc_sk(sk);
2812         lock_sock(sk);
2813         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2814                 /* socket was connected before, no more data to read */
2815                 rc = 0;
2816                 goto out;
2817         }
2818         if ((sk->sk_state == SMC_INIT) ||
2819             (sk->sk_state == SMC_LISTEN) ||
2820             (sk->sk_state == SMC_CLOSED))
2821                 goto out;
2822
2823         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2824                 rc = 0;
2825                 goto out;
2826         }
2827
2828         if (smc->use_fallback) {
2829                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2830         } else {
2831                 msg->msg_namelen = 0;
2832                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2833                 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2834         }
2835
2836 out:
2837         release_sock(sk);
2838         return rc;
2839 }
2840
2841 static __poll_t smc_accept_poll(struct sock *parent)
2842 {
2843         struct smc_sock *isk = smc_sk(parent);
2844         __poll_t mask = 0;
2845
2846         spin_lock(&isk->accept_q_lock);
2847         if (!list_empty(&isk->accept_q))
2848                 mask = EPOLLIN | EPOLLRDNORM;
2849         spin_unlock(&isk->accept_q_lock);
2850
2851         return mask;
2852 }
2853
2854 __poll_t smc_poll(struct file *file, struct socket *sock,
2855                   poll_table *wait)
2856 {
2857         struct sock *sk = sock->sk;
2858         struct smc_sock *smc;
2859         __poll_t mask = 0;
2860
2861         if (!sk)
2862                 return EPOLLNVAL;
2863
2864         smc = smc_sk(sock->sk);
2865         if (smc->use_fallback) {
2866                 /* delegate to CLC child sock */
2867                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2868                 sk->sk_err = smc->clcsock->sk->sk_err;
2869         } else {
2870                 if (sk->sk_state != SMC_CLOSED)
2871                         sock_poll_wait(file, sock, wait);
2872                 if (sk->sk_err)
2873                         mask |= EPOLLERR;
2874                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2875                     (sk->sk_state == SMC_CLOSED))
2876                         mask |= EPOLLHUP;
2877                 if (sk->sk_state == SMC_LISTEN) {
2878                         /* woken up by sk_data_ready in smc_listen_work() */
2879                         mask |= smc_accept_poll(sk);
2880                 } else if (smc->use_fallback) { /* as result of connect_work()*/
2881                         mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2882                                                            wait);
2883                         sk->sk_err = smc->clcsock->sk->sk_err;
2884                 } else {
2885                         if ((sk->sk_state != SMC_INIT &&
2886                              atomic_read(&smc->conn.sndbuf_space)) ||
2887                             sk->sk_shutdown & SEND_SHUTDOWN) {
2888                                 mask |= EPOLLOUT | EPOLLWRNORM;
2889                         } else {
2890                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2891                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2892                         }
2893                         if (atomic_read(&smc->conn.bytes_to_rcv))
2894                                 mask |= EPOLLIN | EPOLLRDNORM;
2895                         if (sk->sk_shutdown & RCV_SHUTDOWN)
2896                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2897                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
2898                                 mask |= EPOLLIN;
2899                         if (smc->conn.urg_state == SMC_URG_VALID)
2900                                 mask |= EPOLLPRI;
2901                 }
2902         }
2903
2904         return mask;
2905 }
2906
2907 int smc_shutdown(struct socket *sock, int how)
2908 {
2909         struct sock *sk = sock->sk;
2910         bool do_shutdown = true;
2911         struct smc_sock *smc;
2912         int rc = -EINVAL;
2913         int old_state;
2914         int rc1 = 0;
2915
2916         smc = smc_sk(sk);
2917
2918         if ((how < SHUT_RD) || (how > SHUT_RDWR))
2919                 return rc;
2920
2921         lock_sock(sk);
2922
2923         if (sock->state == SS_CONNECTING) {
2924                 if (sk->sk_state == SMC_ACTIVE)
2925                         sock->state = SS_CONNECTED;
2926                 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2927                          sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2928                          sk->sk_state == SMC_APPCLOSEWAIT1 ||
2929                          sk->sk_state == SMC_APPCLOSEWAIT2 ||
2930                          sk->sk_state == SMC_APPFINCLOSEWAIT)
2931                         sock->state = SS_DISCONNECTING;
2932         }
2933
2934         rc = -ENOTCONN;
2935         if ((sk->sk_state != SMC_ACTIVE) &&
2936             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2937             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2938             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2939             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2940             (sk->sk_state != SMC_APPFINCLOSEWAIT))
2941                 goto out;
2942         if (smc->use_fallback) {
2943                 rc = kernel_sock_shutdown(smc->clcsock, how);
2944                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2945                 if (sk->sk_shutdown == SHUTDOWN_MASK) {
2946                         sk->sk_state = SMC_CLOSED;
2947                         sk->sk_socket->state = SS_UNCONNECTED;
2948                         sock_put(sk);
2949                 }
2950                 goto out;
2951         }
2952         switch (how) {
2953         case SHUT_RDWR:         /* shutdown in both directions */
2954                 old_state = sk->sk_state;
2955                 rc = smc_close_active(smc);
2956                 if (old_state == SMC_ACTIVE &&
2957                     sk->sk_state == SMC_PEERCLOSEWAIT1)
2958                         do_shutdown = false;
2959                 break;
2960         case SHUT_WR:
2961                 rc = smc_close_shutdown_write(smc);
2962                 break;
2963         case SHUT_RD:
2964                 rc = 0;
2965                 /* nothing more to do because peer is not involved */
2966                 break;
2967         }
2968         if (do_shutdown && smc->clcsock)
2969                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2970         /* map sock_shutdown_cmd constants to sk_shutdown value range */
2971         sk->sk_shutdown |= how + 1;
2972
2973         if (sk->sk_state == SMC_CLOSED)
2974                 sock->state = SS_UNCONNECTED;
2975         else
2976                 sock->state = SS_DISCONNECTING;
2977 out:
2978         release_sock(sk);
2979         return rc ? rc : rc1;
2980 }
2981
2982 static int __smc_getsockopt(struct socket *sock, int level, int optname,
2983                             char __user *optval, int __user *optlen)
2984 {
2985         struct smc_sock *smc;
2986         int val, len;
2987
2988         smc = smc_sk(sock->sk);
2989
2990         if (get_user(len, optlen))
2991                 return -EFAULT;
2992
2993         len = min_t(int, len, sizeof(int));
2994
2995         if (len < 0)
2996                 return -EINVAL;
2997
2998         switch (optname) {
2999         case SMC_LIMIT_HS:
3000                 val = smc->limit_smc_hs;
3001                 break;
3002         default:
3003                 return -EOPNOTSUPP;
3004         }
3005
3006         if (put_user(len, optlen))
3007                 return -EFAULT;
3008         if (copy_to_user(optval, &val, len))
3009                 return -EFAULT;
3010
3011         return 0;
3012 }
3013
3014 static int __smc_setsockopt(struct socket *sock, int level, int optname,
3015                             sockptr_t optval, unsigned int optlen)
3016 {
3017         struct sock *sk = sock->sk;
3018         struct smc_sock *smc;
3019         int val, rc;
3020
3021         smc = smc_sk(sk);
3022
3023         lock_sock(sk);
3024         switch (optname) {
3025         case SMC_LIMIT_HS:
3026                 if (optlen < sizeof(int)) {
3027                         rc = -EINVAL;
3028                         break;
3029                 }
3030                 if (copy_from_sockptr(&val, optval, sizeof(int))) {
3031                         rc = -EFAULT;
3032                         break;
3033                 }
3034
3035                 smc->limit_smc_hs = !!val;
3036                 rc = 0;
3037                 break;
3038         default:
3039                 rc = -EOPNOTSUPP;
3040                 break;
3041         }
3042         release_sock(sk);
3043
3044         return rc;
3045 }
3046
3047 int smc_setsockopt(struct socket *sock, int level, int optname,
3048                    sockptr_t optval, unsigned int optlen)
3049 {
3050         struct sock *sk = sock->sk;
3051         struct smc_sock *smc;
3052         int val, rc;
3053
3054         if (level == SOL_TCP && optname == TCP_ULP)
3055                 return -EOPNOTSUPP;
3056         else if (level == SOL_SMC)
3057                 return __smc_setsockopt(sock, level, optname, optval, optlen);
3058
3059         smc = smc_sk(sk);
3060
3061         /* generic setsockopts reaching us here always apply to the
3062          * CLC socket
3063          */
3064         mutex_lock(&smc->clcsock_release_lock);
3065         if (!smc->clcsock) {
3066                 mutex_unlock(&smc->clcsock_release_lock);
3067                 return -EBADF;
3068         }
3069         if (unlikely(!smc->clcsock->ops->setsockopt))
3070                 rc = -EOPNOTSUPP;
3071         else
3072                 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
3073                                                    optval, optlen);
3074         if (smc->clcsock->sk->sk_err) {
3075                 sk->sk_err = smc->clcsock->sk->sk_err;
3076                 sk_error_report(sk);
3077         }
3078         mutex_unlock(&smc->clcsock_release_lock);
3079
3080         if (optlen < sizeof(int))
3081                 return -EINVAL;
3082         if (copy_from_sockptr(&val, optval, sizeof(int)))
3083                 return -EFAULT;
3084
3085         lock_sock(sk);
3086         if (rc || smc->use_fallback)
3087                 goto out;
3088         switch (optname) {
3089         case TCP_FASTOPEN:
3090         case TCP_FASTOPEN_CONNECT:
3091         case TCP_FASTOPEN_KEY:
3092         case TCP_FASTOPEN_NO_COOKIE:
3093                 /* option not supported by SMC */
3094                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
3095                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
3096                 } else {
3097                         rc = -EINVAL;
3098                 }
3099                 break;
3100         case TCP_NODELAY:
3101                 if (sk->sk_state != SMC_INIT &&
3102                     sk->sk_state != SMC_LISTEN &&
3103                     sk->sk_state != SMC_CLOSED) {
3104                         if (val) {
3105                                 SMC_STAT_INC(smc, ndly_cnt);
3106                                 smc_tx_pending(&smc->conn);
3107                                 cancel_delayed_work(&smc->conn.tx_work);
3108                         }
3109                 }
3110                 break;
3111         case TCP_CORK:
3112                 if (sk->sk_state != SMC_INIT &&
3113                     sk->sk_state != SMC_LISTEN &&
3114                     sk->sk_state != SMC_CLOSED) {
3115                         if (!val) {
3116                                 SMC_STAT_INC(smc, cork_cnt);
3117                                 smc_tx_pending(&smc->conn);
3118                                 cancel_delayed_work(&smc->conn.tx_work);
3119                         }
3120                 }
3121                 break;
3122         case TCP_DEFER_ACCEPT:
3123                 smc->sockopt_defer_accept = val;
3124                 break;
3125         default:
3126                 break;
3127         }
3128 out:
3129         release_sock(sk);
3130
3131         return rc;
3132 }
3133
3134 int smc_getsockopt(struct socket *sock, int level, int optname,
3135                    char __user *optval, int __user *optlen)
3136 {
3137         struct smc_sock *smc;
3138         int rc;
3139
3140         if (level == SOL_SMC)
3141                 return __smc_getsockopt(sock, level, optname, optval, optlen);
3142
3143         smc = smc_sk(sock->sk);
3144         mutex_lock(&smc->clcsock_release_lock);
3145         if (!smc->clcsock) {
3146                 mutex_unlock(&smc->clcsock_release_lock);
3147                 return -EBADF;
3148         }
3149         /* socket options apply to the CLC socket */
3150         if (unlikely(!smc->clcsock->ops->getsockopt)) {
3151                 mutex_unlock(&smc->clcsock_release_lock);
3152                 return -EOPNOTSUPP;
3153         }
3154         rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
3155                                            optval, optlen);
3156         mutex_unlock(&smc->clcsock_release_lock);
3157         return rc;
3158 }
3159
3160 int smc_ioctl(struct socket *sock, unsigned int cmd,
3161               unsigned long arg)
3162 {
3163         union smc_host_cursor cons, urg;
3164         struct smc_connection *conn;
3165         struct smc_sock *smc;
3166         int answ;
3167
3168         smc = smc_sk(sock->sk);
3169         conn = &smc->conn;
3170         lock_sock(&smc->sk);
3171         if (smc->use_fallback) {
3172                 if (!smc->clcsock) {
3173                         release_sock(&smc->sk);
3174                         return -EBADF;
3175                 }
3176                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
3177                 release_sock(&smc->sk);
3178                 return answ;
3179         }
3180         switch (cmd) {
3181         case SIOCINQ: /* same as FIONREAD */
3182                 if (smc->sk.sk_state == SMC_LISTEN) {
3183                         release_sock(&smc->sk);
3184                         return -EINVAL;
3185                 }
3186                 if (smc->sk.sk_state == SMC_INIT ||
3187                     smc->sk.sk_state == SMC_CLOSED)
3188                         answ = 0;
3189                 else
3190                         answ = atomic_read(&smc->conn.bytes_to_rcv);
3191                 break;
3192         case SIOCOUTQ:
3193                 /* output queue size (not send + not acked) */
3194                 if (smc->sk.sk_state == SMC_LISTEN) {
3195                         release_sock(&smc->sk);
3196                         return -EINVAL;
3197                 }
3198                 if (smc->sk.sk_state == SMC_INIT ||
3199                     smc->sk.sk_state == SMC_CLOSED)
3200                         answ = 0;
3201                 else
3202                         answ = smc->conn.sndbuf_desc->len -
3203                                         atomic_read(&smc->conn.sndbuf_space);
3204                 break;
3205         case SIOCOUTQNSD:
3206                 /* output queue size (not send only) */
3207                 if (smc->sk.sk_state == SMC_LISTEN) {
3208                         release_sock(&smc->sk);
3209                         return -EINVAL;
3210                 }
3211                 if (smc->sk.sk_state == SMC_INIT ||
3212                     smc->sk.sk_state == SMC_CLOSED)
3213                         answ = 0;
3214                 else
3215                         answ = smc_tx_prepared_sends(&smc->conn);
3216                 break;
3217         case SIOCATMARK:
3218                 if (smc->sk.sk_state == SMC_LISTEN) {
3219                         release_sock(&smc->sk);
3220                         return -EINVAL;
3221                 }
3222                 if (smc->sk.sk_state == SMC_INIT ||
3223                     smc->sk.sk_state == SMC_CLOSED) {
3224                         answ = 0;
3225                 } else {
3226                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3227                         smc_curs_copy(&urg, &conn->urg_curs, conn);
3228                         answ = smc_curs_diff(conn->rmb_desc->len,
3229                                              &cons, &urg) == 1;
3230                 }
3231                 break;
3232         default:
3233                 release_sock(&smc->sk);
3234                 return -ENOIOCTLCMD;
3235         }
3236         release_sock(&smc->sk);
3237
3238         return put_user(answ, (int __user *)arg);
3239 }
3240
3241 /* Map the affected portions of the rmbe into an spd, note the number of bytes
3242  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3243  * updates till whenever a respective page has been fully processed.
3244  * Note that subsequent recv() calls have to wait till all splice() processing
3245  * completed.
3246  */
3247 ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3248                         struct pipe_inode_info *pipe, size_t len,
3249                         unsigned int flags)
3250 {
3251         struct sock *sk = sock->sk;
3252         struct smc_sock *smc;
3253         int rc = -ENOTCONN;
3254
3255         smc = smc_sk(sk);
3256         lock_sock(sk);
3257         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3258                 /* socket was connected before, no more data to read */
3259                 rc = 0;
3260                 goto out;
3261         }
3262         if (sk->sk_state == SMC_INIT ||
3263             sk->sk_state == SMC_LISTEN ||
3264             sk->sk_state == SMC_CLOSED)
3265                 goto out;
3266
3267         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3268                 rc = 0;
3269                 goto out;
3270         }
3271
3272         if (smc->use_fallback) {
3273                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3274                                                     pipe, len, flags);
3275         } else {
3276                 if (*ppos) {
3277                         rc = -ESPIPE;
3278                         goto out;
3279                 }
3280                 if (flags & SPLICE_F_NONBLOCK)
3281                         flags = MSG_DONTWAIT;
3282                 else
3283                         flags = 0;
3284                 SMC_STAT_INC(smc, splice_cnt);
3285                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
3286         }
3287 out:
3288         release_sock(sk);
3289
3290         return rc;
3291 }
3292
3293 /* must look like tcp */
3294 static const struct proto_ops smc_sock_ops = {
3295         .family         = PF_SMC,
3296         .owner          = THIS_MODULE,
3297         .release        = smc_release,
3298         .bind           = smc_bind,
3299         .connect        = smc_connect,
3300         .socketpair     = sock_no_socketpair,
3301         .accept         = smc_accept,
3302         .getname        = smc_getname,
3303         .poll           = smc_poll,
3304         .ioctl          = smc_ioctl,
3305         .listen         = smc_listen,
3306         .shutdown       = smc_shutdown,
3307         .setsockopt     = smc_setsockopt,
3308         .getsockopt     = smc_getsockopt,
3309         .sendmsg        = smc_sendmsg,
3310         .recvmsg        = smc_recvmsg,
3311         .mmap           = sock_no_mmap,
3312         .splice_read    = smc_splice_read,
3313 };
3314
3315 int smc_create_clcsk(struct net *net, struct sock *sk, int family)
3316 {
3317         struct smc_sock *smc = smc_sk(sk);
3318         int rc;
3319
3320         rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3321                               &smc->clcsock);
3322         if (rc) {
3323                 sk_common_release(sk);
3324                 return rc;
3325         }
3326
3327         /* smc_clcsock_release() does not wait smc->clcsock->sk's
3328          * destruction;  its sk_state might not be TCP_CLOSE after
3329          * smc->sk is close()d, and TCP timers can be fired later,
3330          * which need net ref.
3331          */
3332         sk = smc->clcsock->sk;
3333         __netns_tracker_free(net, &sk->ns_tracker, false);
3334         sk->sk_net_refcnt = 1;
3335         get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
3336         sock_inuse_add(net, 1);
3337         return 0;
3338 }
3339
3340 static int __smc_create(struct net *net, struct socket *sock, int protocol,
3341                         int kern, struct socket *clcsock)
3342 {
3343         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
3344         struct smc_sock *smc;
3345         struct sock *sk;
3346         int rc;
3347
3348         rc = -ESOCKTNOSUPPORT;
3349         if (sock->type != SOCK_STREAM)
3350                 goto out;
3351
3352         rc = -EPROTONOSUPPORT;
3353         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
3354                 goto out;
3355
3356         rc = -ENOBUFS;
3357         sock->ops = &smc_sock_ops;
3358         sock->state = SS_UNCONNECTED;
3359         sk = smc_sock_alloc(net, sock, protocol);
3360         if (!sk)
3361                 goto out;
3362
3363         /* create internal TCP socket for CLC handshake and fallback */
3364         smc = smc_sk(sk);
3365
3366         rc = 0;
3367         if (clcsock)
3368                 smc->clcsock = clcsock;
3369         else
3370                 rc = smc_create_clcsk(net, sk, family);
3371 out:
3372         return rc;
3373 }
3374
3375 static int smc_create(struct net *net, struct socket *sock, int protocol,
3376                       int kern)
3377 {
3378         return __smc_create(net, sock, protocol, kern, NULL);
3379 }
3380
3381 static const struct net_proto_family smc_sock_family_ops = {
3382         .family = PF_SMC,
3383         .owner  = THIS_MODULE,
3384         .create = smc_create,
3385 };
3386
3387 static int smc_ulp_init(struct sock *sk)
3388 {
3389         struct socket *tcp = sk->sk_socket;
3390         struct net *net = sock_net(sk);
3391         struct socket *smcsock;
3392         int protocol, ret;
3393
3394         /* only TCP can be replaced */
3395         if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3396             (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3397                 return -ESOCKTNOSUPPORT;
3398         /* don't handle wq now */
3399         if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3400                 return -ENOTCONN;
3401
3402         if (sk->sk_family == AF_INET)
3403                 protocol = SMCPROTO_SMC;
3404         else
3405                 protocol = SMCPROTO_SMC6;
3406
3407         smcsock = sock_alloc();
3408         if (!smcsock)
3409                 return -ENFILE;
3410
3411         smcsock->type = SOCK_STREAM;
3412         __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3413         ret = __smc_create(net, smcsock, protocol, 1, tcp);
3414         if (ret) {
3415                 sock_release(smcsock); /* module_put() which ops won't be NULL */
3416                 return ret;
3417         }
3418
3419         /* replace tcp socket to smc */
3420         smcsock->file = tcp->file;
3421         smcsock->file->private_data = smcsock;
3422         smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3423         smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3424         tcp->file = NULL;
3425
3426         return ret;
3427 }
3428
3429 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3430                           const gfp_t priority)
3431 {
3432         struct inet_connection_sock *icsk = inet_csk(newsk);
3433
3434         /* don't inherit ulp ops to child when listen */
3435         icsk->icsk_ulp_ops = NULL;
3436 }
3437
3438 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3439         .name           = "smc",
3440         .owner          = THIS_MODULE,
3441         .init           = smc_ulp_init,
3442         .clone          = smc_ulp_clone,
3443 };
3444
3445 unsigned int smc_net_id;
3446
3447 static __net_init int smc_net_init(struct net *net)
3448 {
3449         int rc;
3450
3451         rc = smc_sysctl_net_init(net);
3452         if (rc)
3453                 return rc;
3454         return smc_pnet_net_init(net);
3455 }
3456
3457 static void __net_exit smc_net_exit(struct net *net)
3458 {
3459         smc_sysctl_net_exit(net);
3460         smc_pnet_net_exit(net);
3461 }
3462
3463 static __net_init int smc_net_stat_init(struct net *net)
3464 {
3465         return smc_stats_init(net);
3466 }
3467
3468 static void __net_exit smc_net_stat_exit(struct net *net)
3469 {
3470         smc_stats_exit(net);
3471 }
3472
3473 static struct pernet_operations smc_net_ops = {
3474         .init = smc_net_init,
3475         .exit = smc_net_exit,
3476         .id   = &smc_net_id,
3477         .size = sizeof(struct smc_net),
3478 };
3479
3480 static struct pernet_operations smc_net_stat_ops = {
3481         .init = smc_net_stat_init,
3482         .exit = smc_net_stat_exit,
3483 };
3484
3485 static int __init smc_init(void)
3486 {
3487         int rc;
3488
3489         rc = register_pernet_subsys(&smc_net_ops);
3490         if (rc)
3491                 return rc;
3492
3493         rc = register_pernet_subsys(&smc_net_stat_ops);
3494         if (rc)
3495                 goto out_pernet_subsys;
3496
3497         rc = smc_ism_init();
3498         if (rc)
3499                 goto out_pernet_subsys_stat;
3500         smc_clc_init();
3501
3502         rc = smc_nl_init();
3503         if (rc)
3504                 goto out_ism;
3505
3506         rc = smc_pnet_init();
3507         if (rc)
3508                 goto out_nl;
3509
3510         rc = -ENOMEM;
3511
3512         smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3513         if (!smc_tcp_ls_wq)
3514                 goto out_pnet;
3515
3516         smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3517         if (!smc_hs_wq)
3518                 goto out_alloc_tcp_ls_wq;
3519
3520         smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3521         if (!smc_close_wq)
3522                 goto out_alloc_hs_wq;
3523
3524         rc = smc_core_init();
3525         if (rc) {
3526                 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
3527                 goto out_alloc_wqs;
3528         }
3529
3530         rc = smc_llc_init();
3531         if (rc) {
3532                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
3533                 goto out_core;
3534         }
3535
3536         rc = smc_cdc_init();
3537         if (rc) {
3538                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
3539                 goto out_core;
3540         }
3541
3542         rc = proto_register(&smc_proto, 1);
3543         if (rc) {
3544                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
3545                 goto out_core;
3546         }
3547
3548         rc = proto_register(&smc_proto6, 1);
3549         if (rc) {
3550                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3551                 goto out_proto;
3552         }
3553
3554         rc = sock_register(&smc_sock_family_ops);
3555         if (rc) {
3556                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
3557                 goto out_proto6;
3558         }
3559         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
3560         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
3561
3562         rc = smc_ib_register_client();
3563         if (rc) {
3564                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3565                 goto out_sock;
3566         }
3567
3568         rc = smc_loopback_init();
3569         if (rc) {
3570                 pr_err("%s: smc_loopback_init fails with %d\n", __func__, rc);
3571                 goto out_ib;
3572         }
3573
3574         rc = tcp_register_ulp(&smc_ulp_ops);
3575         if (rc) {
3576                 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
3577                 goto out_lo;
3578         }
3579         rc = smc_inet_init();
3580         if (rc) {
3581                 pr_err("%s: smc_inet_init fails with %d\n", __func__, rc);
3582                 goto out_ulp;
3583         }
3584         static_branch_enable(&tcp_have_smc);
3585         return 0;
3586 out_ulp:
3587         tcp_unregister_ulp(&smc_ulp_ops);
3588 out_lo:
3589         smc_loopback_exit();
3590 out_ib:
3591         smc_ib_unregister_client();
3592 out_sock:
3593         sock_unregister(PF_SMC);
3594 out_proto6:
3595         proto_unregister(&smc_proto6);
3596 out_proto:
3597         proto_unregister(&smc_proto);
3598 out_core:
3599         smc_core_exit();
3600 out_alloc_wqs:
3601         destroy_workqueue(smc_close_wq);
3602 out_alloc_hs_wq:
3603         destroy_workqueue(smc_hs_wq);
3604 out_alloc_tcp_ls_wq:
3605         destroy_workqueue(smc_tcp_ls_wq);
3606 out_pnet:
3607         smc_pnet_exit();
3608 out_nl:
3609         smc_nl_exit();
3610 out_ism:
3611         smc_clc_exit();
3612         smc_ism_exit();
3613 out_pernet_subsys_stat:
3614         unregister_pernet_subsys(&smc_net_stat_ops);
3615 out_pernet_subsys:
3616         unregister_pernet_subsys(&smc_net_ops);
3617
3618         return rc;
3619 }
3620
3621 static void __exit smc_exit(void)
3622 {
3623         static_branch_disable(&tcp_have_smc);
3624         smc_inet_exit();
3625         tcp_unregister_ulp(&smc_ulp_ops);
3626         sock_unregister(PF_SMC);
3627         smc_core_exit();
3628         smc_loopback_exit();
3629         smc_ib_unregister_client();
3630         smc_ism_exit();
3631         destroy_workqueue(smc_close_wq);
3632         destroy_workqueue(smc_tcp_ls_wq);
3633         destroy_workqueue(smc_hs_wq);
3634         proto_unregister(&smc_proto6);
3635         proto_unregister(&smc_proto);
3636         smc_pnet_exit();
3637         smc_nl_exit();
3638         smc_clc_exit();
3639         unregister_pernet_subsys(&smc_net_stat_ops);
3640         unregister_pernet_subsys(&smc_net_ops);
3641         rcu_barrier();
3642 }
3643
3644 module_init(smc_init);
3645 module_exit(smc_exit);
3646
3647 MODULE_AUTHOR("Ursula Braun <[email protected]>");
3648 MODULE_DESCRIPTION("smc socket address family");
3649 MODULE_LICENSE("GPL");
3650 MODULE_ALIAS_NETPROTO(PF_SMC);
3651 MODULE_ALIAS_TCP_ULP("smc");
3652 /* 256 for IPPROTO_SMC and 1 for SOCK_STREAM */
3653 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 256, 1);
3654 #if IS_ENABLED(CONFIG_IPV6)
3655 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 256, 1);
3656 #endif /* CONFIG_IPV6 */
3657 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);