net/smc/af_smc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  AF_SMC protocol family socket handler keeping the AF_INET sock address type
   6  *  applies to SOCK_STREAM sockets only
   7  *  offers an alternative communication option for TCP-protocol sockets
   8  *  applicable with RoCE-cards only
   9  *
  10  *  Initial restrictions:
  11  *    - support for alternate links postponed
  12  *
  13  *  Copyright IBM Corp. 2016, 2018
  14  *
  15  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  16  *              based on prototype from Frank Blaschka
  17  */
  18
  19 #define KMSG_COMPONENT "smc"
  20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  21
  22 #include <linux/module.h>
  23 #include <linux/socket.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/in.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/rcupdate_wait.h>
  29 #include <linux/ctype.h>
  30
  31 #include <net/sock.h>
  32 #include <net/tcp.h>
  33 #include <net/smc.h>
  34 #include <asm/ioctls.h>
  35
  36 #include <net/net_namespace.h>
  37 #include <net/netns/generic.h>
  38 #include "smc_netns.h"
  39
  40 #include "smc.h"
  41 #include "smc_clc.h"
  42 #include "smc_llc.h"
  43 #include "smc_cdc.h"
  44 #include "smc_core.h"
  45 #include "smc_ib.h"
  46 #include "smc_ism.h"
  47 #include "smc_pnet.h"
  48 #include "smc_netlink.h"
  49 #include "smc_tx.h"
  50 #include "smc_rx.h"
  51 #include "smc_close.h"
  52 #include "smc_stats.h"
  53
  54 static DEFINE_MUTEX(smc_server_lgr_pending);    /* serialize link group
  55                                                  * creation on server
  56                                                  */
  57 static DEFINE_MUTEX(smc_client_lgr_pending);    /* serialize link group
  58                                                  * creation on client
  59                                                  */
  60
  61 struct workqueue_struct *smc_hs_wq;     /* wq for handshake work */
  62 struct workqueue_struct *smc_close_wq;  /* wq for close work */
  63
  64 static void smc_tcp_listen_work(struct work_struct *);
  65 static void smc_connect_work(struct work_struct *);
  66
  67 static void smc_set_keepalive(struct sock *sk, int val)
  68 {
  69         struct smc_sock *smc = smc_sk(sk);
  70
  71         smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
  72 }
  73
  74 static struct smc_hashinfo smc_v4_hashinfo = {
  75         .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
  76 };
  77
  78 static struct smc_hashinfo smc_v6_hashinfo = {
  79         .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
  80 };
  81
  82 int smc_hash_sk(struct sock *sk)
  83 {
  84         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
  85         struct hlist_head *head;
  86
  87         head = &h->ht;
  88
  89         write_lock_bh(&h->lock);
  90         sk_add_node(sk, head);
  91         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  92         write_unlock_bh(&h->lock);
  93
  94         return 0;
  95 }
  96 EXPORT_SYMBOL_GPL(smc_hash_sk);
  97
  98 void smc_unhash_sk(struct sock *sk)
  99 {
 100         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
 101
 102         write_lock_bh(&h->lock);
 103         if (sk_del_node_init(sk))
 104                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 105         write_unlock_bh(&h->lock);
 106 }
 107 EXPORT_SYMBOL_GPL(smc_unhash_sk);
 108
 109 struct proto smc_proto = {
 110         .name           = "SMC",
 111         .owner          = THIS_MODULE,
 112         .keepalive      = smc_set_keepalive,
 113         .hash           = smc_hash_sk,
 114         .unhash         = smc_unhash_sk,
 115         .obj_size       = sizeof(struct smc_sock),
 116         .h.smc_hash     = &smc_v4_hashinfo,
 117         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 118 };
 119 EXPORT_SYMBOL_GPL(smc_proto);
 120
 121 struct proto smc_proto6 = {
 122         .name           = "SMC6",
 123         .owner          = THIS_MODULE,
 124         .keepalive      = smc_set_keepalive,
 125         .hash           = smc_hash_sk,
 126         .unhash         = smc_unhash_sk,
 127         .obj_size       = sizeof(struct smc_sock),
 128         .h.smc_hash     = &smc_v6_hashinfo,
 129         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 130 };
 131 EXPORT_SYMBOL_GPL(smc_proto6);
 132
 133 static void smc_restore_fallback_changes(struct smc_sock *smc)
 134 {
 135         if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
 136                 smc->clcsock->file->private_data = smc->sk.sk_socket;
 137                 smc->clcsock->file = NULL;
 138         }
 139 }
 140
 141 static int __smc_release(struct smc_sock *smc)
 142 {
 143         struct sock *sk = &smc->sk;
 144         int rc = 0;
 145
 146         if (!smc->use_fallback) {
 147                 rc = smc_close_active(smc);
 148                 sock_set_flag(sk, SOCK_DEAD);
 149                 sk->sk_shutdown |= SHUTDOWN_MASK;
 150         } else {
 151                 if (sk->sk_state != SMC_CLOSED) {
 152                         if (sk->sk_state != SMC_LISTEN &&
 153                             sk->sk_state != SMC_INIT)
 154                                 sock_put(sk); /* passive closing */
 155                         if (sk->sk_state == SMC_LISTEN) {
 156                                 /* wake up clcsock accept */
 157                                 rc = kernel_sock_shutdown(smc->clcsock,
 158                                                           SHUT_RDWR);
 159                         }
 160                         sk->sk_state = SMC_CLOSED;
 161                         sk->sk_state_change(sk);
 162                 }
 163                 smc_restore_fallback_changes(smc);
 164         }
 165
 166         sk->sk_prot->unhash(sk);
 167
 168         if (sk->sk_state == SMC_CLOSED) {
 169                 if (smc->clcsock) {
 170                         release_sock(sk);
 171                         smc_clcsock_release(smc);
 172                         lock_sock(sk);
 173                 }
 174                 if (!smc->use_fallback)
 175                         smc_conn_free(&smc->conn);
 176         }
 177
 178         return rc;
 179 }
 180
 181 static int smc_release(struct socket *sock)
 182 {
 183         struct sock *sk = sock->sk;
 184         struct smc_sock *smc;
 185         int old_state, rc = 0;
 186
 187         if (!sk)
 188                 goto out;
 189
 190         sock_hold(sk); /* sock_put below */
 191         smc = smc_sk(sk);
 192
 193         old_state = sk->sk_state;
 194
 195         /* cleanup for a dangling non-blocking connect */
 196         if (smc->connect_nonblock && old_state == SMC_INIT)
 197                 tcp_abort(smc->clcsock->sk, ECONNABORTED);
 198
 199         if (cancel_work_sync(&smc->connect_work))
 200                 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
 201
 202         if (sk->sk_state == SMC_LISTEN)
 203                 /* smc_close_non_accepted() is called and acquires
 204                  * sock lock for child sockets again
 205                  */
 206                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 207         else
 208                 lock_sock(sk);
 209
 210         if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
 211             !smc->use_fallback)
 212                 smc_close_active_abort(smc);
 213
 214         rc = __smc_release(smc);
 215
 216         /* detach socket */
 217         sock_orphan(sk);
 218         sock->sk = NULL;
 219         release_sock(sk);
 220
 221         sock_put(sk); /* sock_hold above */
 222         sock_put(sk); /* final sock_put */
 223 out:
 224         return rc;
 225 }
 226
 227 static void smc_destruct(struct sock *sk)
 228 {
 229         if (sk->sk_state != SMC_CLOSED)
 230                 return;
 231         if (!sock_flag(sk, SOCK_DEAD))
 232                 return;
 233
 234         sk_refcnt_debug_dec(sk);
 235 }
 236
 237 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
 238                                    int protocol)
 239 {
 240         struct smc_sock *smc;
 241         struct proto *prot;
 242         struct sock *sk;
 243
 244         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
 245         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
 246         if (!sk)
 247                 return NULL;
 248
 249         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
 250         sk->sk_state = SMC_INIT;
 251         sk->sk_destruct = smc_destruct;
 252         sk->sk_protocol = protocol;
 253         smc = smc_sk(sk);
 254         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
 255         INIT_WORK(&smc->connect_work, smc_connect_work);
 256         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
 257         INIT_LIST_HEAD(&smc->accept_q);
 258         spin_lock_init(&smc->accept_q_lock);
 259         spin_lock_init(&smc->conn.send_lock);
 260         sk->sk_prot->hash(sk);
 261         sk_refcnt_debug_inc(sk);
 262         mutex_init(&smc->clcsock_release_lock);
 263
 264         return sk;
 265 }
 266
 267 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
 268                     int addr_len)
 269 {
 270         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 271         struct sock *sk = sock->sk;
 272         struct smc_sock *smc;
 273         int rc;
 274
 275         smc = smc_sk(sk);
 276
 277         /* replicate tests from inet_bind(), to be safe wrt. future changes */
 278         rc = -EINVAL;
 279         if (addr_len < sizeof(struct sockaddr_in))
 280                 goto out;
 281
 282         rc = -EAFNOSUPPORT;
 283         if (addr->sin_family != AF_INET &&
 284             addr->sin_family != AF_INET6 &&
 285             addr->sin_family != AF_UNSPEC)
 286                 goto out;
 287         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
 288         if (addr->sin_family == AF_UNSPEC &&
 289             addr->sin_addr.s_addr != htonl(INADDR_ANY))
 290                 goto out;
 291
 292         lock_sock(sk);
 293
 294         /* Check if socket is already active */
 295         rc = -EINVAL;
 296         if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
 297                 goto out_rel;
 298
 299         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
 300         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
 301
 302 out_rel:
 303         release_sock(sk);
 304 out:
 305         return rc;
 306 }
 307
 308 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
 309                                    unsigned long mask)
 310 {
 311         /* options we don't get control via setsockopt for */
 312         nsk->sk_type = osk->sk_type;
 313         nsk->sk_sndbuf = osk->sk_sndbuf;
 314         nsk->sk_rcvbuf = osk->sk_rcvbuf;
 315         nsk->sk_sndtimeo = osk->sk_sndtimeo;
 316         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
 317         nsk->sk_mark = osk->sk_mark;
 318         nsk->sk_priority = osk->sk_priority;
 319         nsk->sk_rcvlowat = osk->sk_rcvlowat;
 320         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
 321         nsk->sk_err = osk->sk_err;
 322
 323         nsk->sk_flags &= ~mask;
 324         nsk->sk_flags |= osk->sk_flags & mask;
 325 }
 326
 327 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
 328                              (1UL << SOCK_KEEPOPEN) | \
 329                              (1UL << SOCK_LINGER) | \
 330                              (1UL << SOCK_BROADCAST) | \
 331                              (1UL << SOCK_TIMESTAMP) | \
 332                              (1UL << SOCK_DBG) | \
 333                              (1UL << SOCK_RCVTSTAMP) | \
 334                              (1UL << SOCK_RCVTSTAMPNS) | \
 335                              (1UL << SOCK_LOCALROUTE) | \
 336                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
 337                              (1UL << SOCK_RXQ_OVFL) | \
 338                              (1UL << SOCK_WIFI_STATUS) | \
 339                              (1UL << SOCK_NOFCS) | \
 340                              (1UL << SOCK_FILTER_LOCKED) | \
 341                              (1UL << SOCK_TSTAMP_NEW))
 342 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
 343  * clc socket (since smc is not called for these options from net/core)
 344  */
 345 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
 346 {
 347         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
 348 }
 349
 350 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
 351                              (1UL << SOCK_KEEPOPEN) | \
 352                              (1UL << SOCK_LINGER) | \
 353                              (1UL << SOCK_DBG))
 354 /* copy only settings and flags relevant for smc from clc to smc socket */
 355 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
 356 {
 357         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
 358 }
 359
 360 /* register the new rmb on all links */
 361 static int smcr_lgr_reg_rmbs(struct smc_link *link,
 362                              struct smc_buf_desc *rmb_desc)
 363 {
 364         struct smc_link_group *lgr = link->lgr;
 365         int i, rc = 0;
 366
 367         rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
 368         if (rc)
 369                 return rc;
 370         /* protect against parallel smc_llc_cli_rkey_exchange() and
 371          * parallel smcr_link_reg_rmb()
 372          */
 373         mutex_lock(&lgr->llc_conf_mutex);
 374         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 375                 if (!smc_link_active(&lgr->lnk[i]))
 376                         continue;
 377                 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
 378                 if (rc)
 379                         goto out;
 380         }
 381
 382         /* exchange confirm_rkey msg with peer */
 383         rc = smc_llc_do_confirm_rkey(link, rmb_desc);
 384         if (rc) {
 385                 rc = -EFAULT;
 386                 goto out;
 387         }
 388         rmb_desc->is_conf_rkey = true;
 389 out:
 390         mutex_unlock(&lgr->llc_conf_mutex);
 391         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
 392         return rc;
 393 }
 394
 395 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
 396 {
 397         struct smc_link *link = smc->conn.lnk;
 398         struct smc_llc_qentry *qentry;
 399         int rc;
 400
 401         /* receive CONFIRM LINK request from server over RoCE fabric */
 402         qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
 403                               SMC_LLC_CONFIRM_LINK);
 404         if (!qentry) {
 405                 struct smc_clc_msg_decline dclc;
 406
 407                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 408                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 409                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
 410         }
 411         smc_llc_save_peer_uid(qentry);
 412         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
 413         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
 414         if (rc)
 415                 return SMC_CLC_DECL_RMBE_EC;
 416
 417         rc = smc_ib_modify_qp_rts(link);
 418         if (rc)
 419                 return SMC_CLC_DECL_ERR_RDYLNK;
 420
 421         smc_wr_remember_qp_attr(link);
 422
 423         if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
 424                 return SMC_CLC_DECL_ERR_REGRMB;
 425
 426         /* confirm_rkey is implicit on 1st contact */
 427         smc->conn.rmb_desc->is_conf_rkey = true;
 428
 429         /* send CONFIRM LINK response over RoCE fabric */
 430         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
 431         if (rc < 0)
 432                 return SMC_CLC_DECL_TIMEOUT_CL;
 433
 434         smc_llc_link_active(link);
 435         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
 436
 437         /* optional 2nd link, receive ADD LINK request from server */
 438         qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
 439                               SMC_LLC_ADD_LINK);
 440         if (!qentry) {
 441                 struct smc_clc_msg_decline dclc;
 442
 443                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 444                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 445                 if (rc == -EAGAIN)
 446                         rc = 0; /* no DECLINE received, go with one link */
 447                 return rc;
 448         }
 449         smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
 450         smc_llc_cli_add_link(link, qentry);
 451         return 0;
 452 }
 453
 454 static void smcr_conn_save_peer_info(struct smc_sock *smc,
 455                                      struct smc_clc_msg_accept_confirm *clc)
 456 {
 457         int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
 458
 459         smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
 460         smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
 461         smc->conn.peer_rmbe_size = bufsize;
 462         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 463         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
 464 }
 465
 466 static bool smc_isascii(char *hostname)
 467 {
 468         int i;
 469
 470         for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
 471                 if (!isascii(hostname[i]))
 472                         return false;
 473         return true;
 474 }
 475
 476 static void smcd_conn_save_peer_info(struct smc_sock *smc,
 477                                      struct smc_clc_msg_accept_confirm *clc)
 478 {
 479         int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
 480
 481         smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
 482         smc->conn.peer_token = clc->d0.token;
 483         /* msg header takes up space in the buffer */
 484         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
 485         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 486         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
 487         if (clc->hdr.version > SMC_V1 &&
 488             (clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) {
 489                 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
 490                         (struct smc_clc_msg_accept_confirm_v2 *)clc;
 491                 struct smc_clc_first_contact_ext *fce =
 492                         (struct smc_clc_first_contact_ext *)
 493                                 (((u8 *)clc_v2) + sizeof(*clc_v2));
 494
 495                 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid,
 496                        SMC_MAX_EID_LEN);
 497                 smc->conn.lgr->peer_os = fce->os_type;
 498                 smc->conn.lgr->peer_smc_release = fce->release;
 499                 if (smc_isascii(fce->hostname))
 500                         memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
 501                                SMC_MAX_HOSTNAME_LEN);
 502         }
 503 }
 504
 505 static void smc_conn_save_peer_info(struct smc_sock *smc,
 506                                     struct smc_clc_msg_accept_confirm *clc)
 507 {
 508         if (smc->conn.lgr->is_smcd)
 509                 smcd_conn_save_peer_info(smc, clc);
 510         else
 511                 smcr_conn_save_peer_info(smc, clc);
 512 }
 513
 514 static void smc_link_save_peer_info(struct smc_link *link,
 515                                     struct smc_clc_msg_accept_confirm *clc)
 516 {
 517         link->peer_qpn = ntoh24(clc->r0.qpn);
 518         memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE);
 519         memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac));
 520         link->peer_psn = ntoh24(clc->r0.psn);
 521         link->peer_mtu = clc->r0.qp_mtu;
 522 }
 523
 524 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
 525                                        struct smc_stats_fback *fback_arr)
 526 {
 527         int cnt;
 528
 529         for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
 530                 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
 531                         fback_arr[cnt].count++;
 532                         break;
 533                 }
 534                 if (!fback_arr[cnt].fback_code) {
 535                         fback_arr[cnt].fback_code = smc->fallback_rsn;
 536                         fback_arr[cnt].count++;
 537                         break;
 538                 }
 539         }
 540 }
 541
 542 static void smc_stat_fallback(struct smc_sock *smc)
 543 {
 544         struct net *net = sock_net(&smc->sk);
 545
 546         mutex_lock(&net->smc.mutex_fback_rsn);
 547         if (smc->listen_smc) {
 548                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
 549                 net->smc.fback_rsn->srv_fback_cnt++;
 550         } else {
 551                 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
 552                 net->smc.fback_rsn->clnt_fback_cnt++;
 553         }
 554         mutex_unlock(&net->smc.mutex_fback_rsn);
 555 }
 556
 557 /* must be called under rcu read lock */
 558 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
 559 {
 560         struct socket_wq *wq;
 561         __poll_t flags;
 562
 563         wq = rcu_dereference(smc->sk.sk_wq);
 564         if (!skwq_has_sleeper(wq))
 565                 return;
 566
 567         /* wake up smc sk->sk_wq */
 568         if (!key) {
 569                 /* sk_state_change */
 570                 wake_up_interruptible_all(&wq->wait);
 571         } else {
 572                 flags = key_to_poll(key);
 573                 if (flags & (EPOLLIN | EPOLLOUT))
 574                         /* sk_data_ready or sk_write_space */
 575                         wake_up_interruptible_sync_poll(&wq->wait, flags);
 576                 else if (flags & EPOLLERR)
 577                         /* sk_error_report */
 578                         wake_up_interruptible_poll(&wq->wait, flags);
 579         }
 580 }
 581
 582 static int smc_fback_mark_woken(wait_queue_entry_t *wait,
 583                                 unsigned int mode, int sync, void *key)
 584 {
 585         struct smc_mark_woken *mark =
 586                 container_of(wait, struct smc_mark_woken, wait_entry);
 587
 588         mark->woken = true;
 589         mark->key = key;
 590         return 0;
 591 }
 592
 593 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
 594                                      void (*clcsock_callback)(struct sock *sk))
 595 {
 596         struct smc_mark_woken mark = { .woken = false };
 597         struct socket_wq *wq;
 598
 599         init_waitqueue_func_entry(&mark.wait_entry,
 600                                   smc_fback_mark_woken);
 601         rcu_read_lock();
 602         wq = rcu_dereference(clcsk->sk_wq);
 603         if (!wq)
 604                 goto out;
 605         add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 606         clcsock_callback(clcsk);
 607         remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
 608
 609         if (mark.woken)
 610                 smc_fback_wakeup_waitqueue(smc, mark.key);
 611 out:
 612         rcu_read_unlock();
 613 }
 614
 615 static void smc_fback_state_change(struct sock *clcsk)
 616 {
 617         struct smc_sock *smc =
 618                 smc_clcsock_user_data(clcsk);
 619
 620         if (!smc)
 621                 return;
 622         smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_state_change);
 623 }
 624
 625 static void smc_fback_data_ready(struct sock *clcsk)
 626 {
 627         struct smc_sock *smc =
 628                 smc_clcsock_user_data(clcsk);
 629
 630         if (!smc)
 631                 return;
 632         smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_data_ready);
 633 }
 634
 635 static void smc_fback_write_space(struct sock *clcsk)
 636 {
 637         struct smc_sock *smc =
 638                 smc_clcsock_user_data(clcsk);
 639
 640         if (!smc)
 641                 return;
 642         smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_write_space);
 643 }
 644
 645 static void smc_fback_error_report(struct sock *clcsk)
 646 {
 647         struct smc_sock *smc =
 648                 smc_clcsock_user_data(clcsk);
 649
 650         if (!smc)
 651                 return;
 652         smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_error_report);
 653 }
 654
 655 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
 656 {
 657         struct sock *clcsk;
 658         int rc = 0;
 659
 660         mutex_lock(&smc->clcsock_release_lock);
 661         if (!smc->clcsock) {
 662                 rc = -EBADF;
 663                 goto out;
 664         }
 665         clcsk = smc->clcsock->sk;
 666
 667         if (smc->use_fallback)
 668                 goto out;
 669         smc->use_fallback = true;
 670         smc->fallback_rsn = reason_code;
 671         smc_stat_fallback(smc);
 672         if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
 673                 smc->clcsock->file = smc->sk.sk_socket->file;
 674                 smc->clcsock->file->private_data = smc->clcsock;
 675                 smc->clcsock->wq.fasync_list =
 676                         smc->sk.sk_socket->wq.fasync_list;
 677
 678                 /* There might be some wait entries remaining
 679                  * in smc sk->sk_wq and they should be woken up
 680                  * as clcsock's wait queue is woken up.
 681                  */
 682                 smc->clcsk_state_change = clcsk->sk_state_change;
 683                 smc->clcsk_data_ready = clcsk->sk_data_ready;
 684                 smc->clcsk_write_space = clcsk->sk_write_space;
 685                 smc->clcsk_error_report = clcsk->sk_error_report;
 686
 687                 clcsk->sk_state_change = smc_fback_state_change;
 688                 clcsk->sk_data_ready = smc_fback_data_ready;
 689                 clcsk->sk_write_space = smc_fback_write_space;
 690                 clcsk->sk_error_report = smc_fback_error_report;
 691
 692                 smc->clcsock->sk->sk_user_data =
 693                         (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
 694         }
 695 out:
 696         mutex_unlock(&smc->clcsock_release_lock);
 697         return rc;
 698 }
 699
 700 /* fall back during connect */
 701 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 702 {
 703         struct net *net = sock_net(&smc->sk);
 704         int rc = 0;
 705
 706         rc = smc_switch_to_fallback(smc, reason_code);
 707         if (rc) { /* fallback fails */
 708                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 709                 if (smc->sk.sk_state == SMC_INIT)
 710                         sock_put(&smc->sk); /* passive closing */
 711                 return rc;
 712         }
 713         smc_copy_sock_settings_to_clc(smc);
 714         smc->connect_nonblock = 0;
 715         if (smc->sk.sk_state == SMC_INIT)
 716                 smc->sk.sk_state = SMC_ACTIVE;
 717         return 0;
 718 }
 719
 720 /* decline and fall back during connect */
 721 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 722                                         u8 version)
 723 {
 724         struct net *net = sock_net(&smc->sk);
 725         int rc;
 726
 727         if (reason_code < 0) { /* error, fallback is not possible */
 728                 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 729                 if (smc->sk.sk_state == SMC_INIT)
 730                         sock_put(&smc->sk); /* passive closing */
 731                 return reason_code;
 732         }
 733         if (reason_code != SMC_CLC_DECL_PEERDECL) {
 734                 rc = smc_clc_send_decline(smc, reason_code, version);
 735                 if (rc < 0) {
 736                         this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 737                         if (smc->sk.sk_state == SMC_INIT)
 738                                 sock_put(&smc->sk); /* passive closing */
 739                         return rc;
 740                 }
 741         }
 742         return smc_connect_fallback(smc, reason_code);
 743 }
 744
 745 static void smc_conn_abort(struct smc_sock *smc, int local_first)
 746 {
 747         struct smc_connection *conn = &smc->conn;
 748         struct smc_link_group *lgr = conn->lgr;
 749
 750         smc_conn_free(conn);
 751         if (local_first)
 752                 smc_lgr_cleanup_early(lgr);
 753 }
 754
 755 /* check if there is a rdma device available for this connection. */
 756 /* called for connect and listen */
 757 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
 758 {
 759         /* PNET table look up: search active ib_device and port
 760          * within same PNETID that also contains the ethernet device
 761          * used for the internal TCP socket
 762          */
 763         smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
 764         if (!ini->ib_dev)
 765                 return SMC_CLC_DECL_NOSMCRDEV;
 766         return 0;
 767 }
 768
 769 /* check if there is an ISM device available for this connection. */
 770 /* called for connect and listen */
 771 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
 772 {
 773         /* Find ISM device with same PNETID as connecting interface  */
 774         smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
 775         if (!ini->ism_dev[0])
 776                 return SMC_CLC_DECL_NOSMCDDEV;
 777         else
 778                 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
 779         return 0;
 780 }
 781
 782 /* is chid unique for the ism devices that are already determined? */
 783 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
 784                                            int cnt)
 785 {
 786         int i = (!ini->ism_dev[0]) ? 1 : 0;
 787
 788         for (; i < cnt; i++)
 789                 if (ini->ism_chid[i] == chid)
 790                         return false;
 791         return true;
 792 }
 793
 794 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
 795  * PNETID matching net_device)
 796  */
 797 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
 798                                        struct smc_init_info *ini)
 799 {
 800         int rc = SMC_CLC_DECL_NOSMCDDEV;
 801         struct smcd_dev *smcd;
 802         int i = 1;
 803         u16 chid;
 804
 805         if (smcd_indicated(ini->smc_type_v1))
 806                 rc = 0;         /* already initialized for V1 */
 807         mutex_lock(&smcd_dev_list.mutex);
 808         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
 809                 if (smcd->going_away || smcd == ini->ism_dev[0])
 810                         continue;
 811                 chid = smc_ism_get_chid(smcd);
 812                 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
 813                         continue;
 814                 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
 815                     smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
 816                         ini->ism_dev[i] = smcd;
 817                         ini->ism_chid[i] = chid;
 818                         ini->is_smcd = true;
 819                         rc = 0;
 820                         i++;
 821                         if (i > SMC_MAX_ISM_DEVS)
 822                                 break;
 823                 }
 824         }
 825         mutex_unlock(&smcd_dev_list.mutex);
 826         ini->ism_offered_cnt = i - 1;
 827         if (!ini->ism_dev[0] && !ini->ism_dev[1])
 828                 ini->smcd_version = 0;
 829
 830         return rc;
 831 }
 832
 833 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
 834 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
 835                                       struct smc_init_info *ini)
 836 {
 837         if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
 838                 return SMC_CLC_DECL_ISMVLANERR;
 839         return 0;
 840 }
 841
 842 static int smc_find_proposal_devices(struct smc_sock *smc,
 843                                      struct smc_init_info *ini)
 844 {
 845         int rc = 0;
 846
 847         /* check if there is an ism device available */
 848         if (ini->smcd_version & SMC_V1) {
 849                 if (smc_find_ism_device(smc, ini) ||
 850                     smc_connect_ism_vlan_setup(smc, ini)) {
 851                         if (ini->smc_type_v1 == SMC_TYPE_B)
 852                                 ini->smc_type_v1 = SMC_TYPE_R;
 853                         else
 854                                 ini->smc_type_v1 = SMC_TYPE_N;
 855                 } /* else ISM V1 is supported for this connection */
 856                 if (smc_find_rdma_device(smc, ini)) {
 857                         if (ini->smc_type_v1 == SMC_TYPE_B)
 858                                 ini->smc_type_v1 = SMC_TYPE_D;
 859                         else
 860                                 ini->smc_type_v1 = SMC_TYPE_N;
 861                 } /* else RDMA is supported for this connection */
 862         }
 863         if (smc_ism_is_v2_capable() && smc_find_ism_v2_device_clnt(smc, ini))
 864                 ini->smc_type_v2 = SMC_TYPE_N;
 865
 866         /* if neither ISM nor RDMA are supported, fallback */
 867         if (!smcr_indicated(ini->smc_type_v1) &&
 868             ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
 869                 rc = SMC_CLC_DECL_NOSMCDEV;
 870
 871         return rc;
 872 }
 873
 874 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
 875  * used, the VLAN ID will be registered again during the connection setup.
 876  */
 877 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
 878                                         struct smc_init_info *ini)
 879 {
 880         if (!smcd_indicated(ini->smc_type_v1))
 881                 return 0;
 882         if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
 883                 return SMC_CLC_DECL_CNFERR;
 884         return 0;
 885 }
 886
 887 #define SMC_CLC_MAX_ACCEPT_LEN \
 888         (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
 889          sizeof(struct smc_clc_first_contact_ext) + \
 890          sizeof(struct smc_clc_msg_trail))
 891
 892 /* CLC handshake during connect */
 893 static int smc_connect_clc(struct smc_sock *smc,
 894                            struct smc_clc_msg_accept_confirm_v2 *aclc2,
 895                            struct smc_init_info *ini)
 896 {
 897         int rc = 0;
 898
 899         /* do inband token exchange */
 900         rc = smc_clc_send_proposal(smc, ini);
 901         if (rc)
 902                 return rc;
 903         /* receive SMC Accept CLC message */
 904         return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
 905                                 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
 906 }
 907
 908 /* setup for RDMA connection of client */
 909 static int smc_connect_rdma(struct smc_sock *smc,
 910                             struct smc_clc_msg_accept_confirm *aclc,
 911                             struct smc_init_info *ini)
 912 {
 913         int i, reason_code = 0;
 914         struct smc_link *link;
 915
 916         ini->is_smcd = false;
 917         ini->ib_lcl = &aclc->r0.lcl;
 918         ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
 919         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
 920
 921         mutex_lock(&smc_client_lgr_pending);
 922         reason_code = smc_conn_create(smc, ini);
 923         if (reason_code) {
 924                 mutex_unlock(&smc_client_lgr_pending);
 925                 return reason_code;
 926         }
 927
 928         smc_conn_save_peer_info(smc, aclc);
 929
 930         if (ini->first_contact_local) {
 931                 link = smc->conn.lnk;
 932         } else {
 933                 /* set link that was assigned by server */
 934                 link = NULL;
 935                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 936                         struct smc_link *l = &smc->conn.lgr->lnk[i];
 937
 938                         if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
 939                             !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
 940                                     SMC_GID_SIZE) &&
 941                             !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
 942                                     sizeof(l->peer_mac))) {
 943                                 link = l;
 944                                 break;
 945                         }
 946                 }
 947                 if (!link) {
 948                         reason_code = SMC_CLC_DECL_NOSRVLINK;
 949                         goto connect_abort;
 950                 }
 951                 smc_switch_link_and_count(&smc->conn, link);
 952         }
 953
 954         /* create send buffer and rmb */
 955         if (smc_buf_create(smc, false)) {
 956                 reason_code = SMC_CLC_DECL_MEM;
 957                 goto connect_abort;
 958         }
 959
 960         if (ini->first_contact_local)
 961                 smc_link_save_peer_info(link, aclc);
 962
 963         if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
 964                 reason_code = SMC_CLC_DECL_ERR_RTOK;
 965                 goto connect_abort;
 966         }
 967
 968         smc_close_init(smc);
 969         smc_rx_init(smc);
 970
 971         if (ini->first_contact_local) {
 972                 if (smc_ib_ready_link(link)) {
 973                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
 974                         goto connect_abort;
 975                 }
 976         } else {
 977                 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
 978                         reason_code = SMC_CLC_DECL_ERR_REGRMB;
 979                         goto connect_abort;
 980                 }
 981         }
 982         smc_rmb_sync_sg_for_device(&smc->conn);
 983
 984         reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
 985                                            SMC_V1);
 986         if (reason_code)
 987                 goto connect_abort;
 988
 989         smc_tx_init(smc);
 990
 991         if (ini->first_contact_local) {
 992                 /* QP confirmation over RoCE fabric */
 993                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
 994                 reason_code = smcr_clnt_conf_first_link(smc);
 995                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
 996                 if (reason_code)
 997                         goto connect_abort;
 998         }
 999         mutex_unlock(&smc_client_lgr_pending);
1000
1001         smc_copy_sock_settings_to_clc(smc);
1002         smc->connect_nonblock = 0;
1003         if (smc->sk.sk_state == SMC_INIT)
1004                 smc->sk.sk_state = SMC_ACTIVE;
1005
1006         return 0;
1007 connect_abort:
1008         smc_conn_abort(smc, ini->first_contact_local);
1009         mutex_unlock(&smc_client_lgr_pending);
1010         smc->connect_nonblock = 0;
1011
1012         return reason_code;
1013 }
1014
1015 /* The server has chosen one of the proposed ISM devices for the communication.
1016  * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1017  */
1018 static int
1019 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
1020                                struct smc_init_info *ini)
1021 {
1022         int i;
1023
1024         for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
1025                 if (ini->ism_chid[i] == ntohs(aclc->chid)) {
1026                         ini->ism_selected = i;
1027                         return 0;
1028                 }
1029         }
1030
1031         return -EPROTO;
1032 }
1033
1034 /* setup for ISM connection of client */
1035 static int smc_connect_ism(struct smc_sock *smc,
1036                            struct smc_clc_msg_accept_confirm *aclc,
1037                            struct smc_init_info *ini)
1038 {
1039         int rc = 0;
1040
1041         ini->is_smcd = true;
1042         ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1043
1044         if (aclc->hdr.version == SMC_V2) {
1045                 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
1046                         (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1047
1048                 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
1049                 if (rc)
1050                         return rc;
1051         }
1052         ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
1053
1054         /* there is only one lgr role for SMC-D; use server lock */
1055         mutex_lock(&smc_server_lgr_pending);
1056         rc = smc_conn_create(smc, ini);
1057         if (rc) {
1058                 mutex_unlock(&smc_server_lgr_pending);
1059                 return rc;
1060         }
1061
1062         /* Create send and receive buffers */
1063         rc = smc_buf_create(smc, true);
1064         if (rc) {
1065                 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1066                 goto connect_abort;
1067         }
1068
1069         smc_conn_save_peer_info(smc, aclc);
1070         smc_close_init(smc);
1071         smc_rx_init(smc);
1072         smc_tx_init(smc);
1073
1074         rc = smc_clc_send_confirm(smc, ini->first_contact_local,
1075                                   aclc->hdr.version);
1076         if (rc)
1077                 goto connect_abort;
1078         mutex_unlock(&smc_server_lgr_pending);
1079
1080         smc_copy_sock_settings_to_clc(smc);
1081         smc->connect_nonblock = 0;
1082         if (smc->sk.sk_state == SMC_INIT)
1083                 smc->sk.sk_state = SMC_ACTIVE;
1084
1085         return 0;
1086 connect_abort:
1087         smc_conn_abort(smc, ini->first_contact_local);
1088         mutex_unlock(&smc_server_lgr_pending);
1089         smc->connect_nonblock = 0;
1090
1091         return rc;
1092 }
1093
1094 /* check if received accept type and version matches a proposed one */
1095 static int smc_connect_check_aclc(struct smc_init_info *ini,
1096                                   struct smc_clc_msg_accept_confirm *aclc)
1097 {
1098         if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1099              !smcr_indicated(ini->smc_type_v1)) ||
1100             (aclc->hdr.typev1 == SMC_TYPE_D &&
1101              ((!smcd_indicated(ini->smc_type_v1) &&
1102                !smcd_indicated(ini->smc_type_v2)) ||
1103               (aclc->hdr.version == SMC_V1 &&
1104                !smcd_indicated(ini->smc_type_v1)) ||
1105               (aclc->hdr.version == SMC_V2 &&
1106                !smcd_indicated(ini->smc_type_v2)))))
1107                 return SMC_CLC_DECL_MODEUNSUPP;
1108
1109         return 0;
1110 }
1111
1112 /* perform steps before actually connecting */
1113 static int __smc_connect(struct smc_sock *smc)
1114 {
1115         u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1116         struct smc_clc_msg_accept_confirm_v2 *aclc2;
1117         struct smc_clc_msg_accept_confirm *aclc;
1118         struct smc_init_info *ini = NULL;
1119         u8 *buf = NULL;
1120         int rc = 0;
1121
1122         if (smc->use_fallback)
1123                 return smc_connect_fallback(smc, smc->fallback_rsn);
1124
1125         /* if peer has not signalled SMC-capability, fall back */
1126         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
1127                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
1128
1129         /* IPSec connections opt out of SMC optimizations */
1130         if (using_ipsec(smc))
1131                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1132                                                     version);
1133
1134         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1135         if (!ini)
1136                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1137                                                     version);
1138
1139         ini->smcd_version = SMC_V1;
1140         ini->smcd_version |= smc_ism_is_v2_capable() ? SMC_V2 : 0;
1141         ini->smc_type_v1 = SMC_TYPE_B;
1142         ini->smc_type_v2 = smc_ism_is_v2_capable() ? SMC_TYPE_D : SMC_TYPE_N;
1143
1144         /* get vlan id from IP device */
1145         if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
1146                 ini->smcd_version &= ~SMC_V1;
1147                 ini->smc_type_v1 = SMC_TYPE_N;
1148                 if (!ini->smcd_version) {
1149                         rc = SMC_CLC_DECL_GETVLANERR;
1150                         goto fallback;
1151                 }
1152         }
1153
1154         rc = smc_find_proposal_devices(smc, ini);
1155         if (rc)
1156                 goto fallback;
1157
1158         buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1159         if (!buf) {
1160                 rc = SMC_CLC_DECL_MEM;
1161                 goto fallback;
1162         }
1163         aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1164         aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1165
1166         /* perform CLC handshake */
1167         rc = smc_connect_clc(smc, aclc2, ini);
1168         if (rc)
1169                 goto vlan_cleanup;
1170
1171         /* check if smc modes and versions of CLC proposal and accept match */
1172         rc = smc_connect_check_aclc(ini, aclc);
1173         version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1174         ini->smcd_version = version;
1175         if (rc)
1176                 goto vlan_cleanup;
1177
1178         /* depending on previous steps, connect using rdma or ism */
1179         if (aclc->hdr.typev1 == SMC_TYPE_R)
1180                 rc = smc_connect_rdma(smc, aclc, ini);
1181         else if (aclc->hdr.typev1 == SMC_TYPE_D)
1182                 rc = smc_connect_ism(smc, aclc, ini);
1183         if (rc)
1184                 goto vlan_cleanup;
1185
1186         SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1187         smc_connect_ism_vlan_cleanup(smc, ini);
1188         kfree(buf);
1189         kfree(ini);
1190         return 0;
1191
1192 vlan_cleanup:
1193         smc_connect_ism_vlan_cleanup(smc, ini);
1194         kfree(buf);
1195 fallback:
1196         kfree(ini);
1197         return smc_connect_decline_fallback(smc, rc, version);
1198 }
1199
1200 static void smc_connect_work(struct work_struct *work)
1201 {
1202         struct smc_sock *smc = container_of(work, struct smc_sock,
1203                                             connect_work);
1204         long timeo = smc->sk.sk_sndtimeo;
1205         int rc = 0;
1206
1207         if (!timeo)
1208                 timeo = MAX_SCHEDULE_TIMEOUT;
1209         lock_sock(smc->clcsock->sk);
1210         if (smc->clcsock->sk->sk_err) {
1211                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1212         } else if ((1 << smc->clcsock->sk->sk_state) &
1213                                         (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1214                 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1215                 if ((rc == -EPIPE) &&
1216                     ((1 << smc->clcsock->sk->sk_state) &
1217                                         (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1218                         rc = 0;
1219         }
1220         release_sock(smc->clcsock->sk);
1221         lock_sock(&smc->sk);
1222         if (rc != 0 || smc->sk.sk_err) {
1223                 smc->sk.sk_state = SMC_CLOSED;
1224                 if (rc == -EPIPE || rc == -EAGAIN)
1225                         smc->sk.sk_err = EPIPE;
1226                 else if (rc == -ECONNREFUSED)
1227                         smc->sk.sk_err = ECONNREFUSED;
1228                 else if (signal_pending(current))
1229                         smc->sk.sk_err = -sock_intr_errno(timeo);
1230                 sock_put(&smc->sk); /* passive closing */
1231                 goto out;
1232         }
1233
1234         rc = __smc_connect(smc);
1235         if (rc < 0)
1236                 smc->sk.sk_err = -rc;
1237
1238 out:
1239         if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1240                 if (smc->sk.sk_err) {
1241                         smc->sk.sk_state_change(&smc->sk);
1242                 } else { /* allow polling before and after fallback decision */
1243                         smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1244                         smc->sk.sk_write_space(&smc->sk);
1245                 }
1246         }
1247         release_sock(&smc->sk);
1248 }
1249
1250 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1251                        int alen, int flags)
1252 {
1253         struct sock *sk = sock->sk;
1254         struct smc_sock *smc;
1255         int rc = -EINVAL;
1256
1257         smc = smc_sk(sk);
1258
1259         /* separate smc parameter checking to be safe */
1260         if (alen < sizeof(addr->sa_family))
1261                 goto out_err;
1262         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1263                 goto out_err;
1264
1265         lock_sock(sk);
1266         switch (sk->sk_state) {
1267         default:
1268                 goto out;
1269         case SMC_ACTIVE:
1270                 rc = -EISCONN;
1271                 goto out;
1272         case SMC_INIT:
1273                 break;
1274         }
1275
1276         smc_copy_sock_settings_to_clc(smc);
1277         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1278         if (smc->connect_nonblock) {
1279                 rc = -EALREADY;
1280                 goto out;
1281         }
1282         rc = kernel_connect(smc->clcsock, addr, alen, flags);
1283         if (rc && rc != -EINPROGRESS)
1284                 goto out;
1285
1286         if (smc->use_fallback)
1287                 goto out;
1288         sock_hold(&smc->sk); /* sock put in passive closing */
1289         if (flags & O_NONBLOCK) {
1290                 if (queue_work(smc_hs_wq, &smc->connect_work))
1291                         smc->connect_nonblock = 1;
1292                 rc = -EINPROGRESS;
1293         } else {
1294                 rc = __smc_connect(smc);
1295                 if (rc < 0)
1296                         goto out;
1297                 else
1298                         rc = 0; /* success cases including fallback */
1299         }
1300
1301 out:
1302         release_sock(sk);
1303 out_err:
1304         return rc;
1305 }
1306
1307 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1308 {
1309         struct socket *new_clcsock = NULL;
1310         struct sock *lsk = &lsmc->sk;
1311         struct sock *new_sk;
1312         int rc = -EINVAL;
1313
1314         release_sock(lsk);
1315         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1316         if (!new_sk) {
1317                 rc = -ENOMEM;
1318                 lsk->sk_err = ENOMEM;
1319                 *new_smc = NULL;
1320                 lock_sock(lsk);
1321                 goto out;
1322         }
1323         *new_smc = smc_sk(new_sk);
1324
1325         mutex_lock(&lsmc->clcsock_release_lock);
1326         if (lsmc->clcsock)
1327                 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1328         mutex_unlock(&lsmc->clcsock_release_lock);
1329         lock_sock(lsk);
1330         if  (rc < 0 && rc != -EAGAIN)
1331                 lsk->sk_err = -rc;
1332         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1333                 new_sk->sk_prot->unhash(new_sk);
1334                 if (new_clcsock)
1335                         sock_release(new_clcsock);
1336                 new_sk->sk_state = SMC_CLOSED;
1337                 sock_set_flag(new_sk, SOCK_DEAD);
1338                 sock_put(new_sk); /* final */
1339                 *new_smc = NULL;
1340                 goto out;
1341         }
1342
1343         /* new clcsock has inherited the smc listen-specific sk_data_ready
1344          * function; switch it back to the original sk_data_ready function
1345          */
1346         new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1347         (*new_smc)->clcsock = new_clcsock;
1348 out:
1349         return rc;
1350 }
1351
1352 /* add a just created sock to the accept queue of the listen sock as
1353  * candidate for a following socket accept call from user space
1354  */
1355 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1356 {
1357         struct smc_sock *par = smc_sk(parent);
1358
1359         sock_hold(sk); /* sock_put in smc_accept_unlink () */
1360         spin_lock(&par->accept_q_lock);
1361         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1362         spin_unlock(&par->accept_q_lock);
1363         sk_acceptq_added(parent);
1364 }
1365
1366 /* remove a socket from the accept queue of its parental listening socket */
1367 static void smc_accept_unlink(struct sock *sk)
1368 {
1369         struct smc_sock *par = smc_sk(sk)->listen_smc;
1370
1371         spin_lock(&par->accept_q_lock);
1372         list_del_init(&smc_sk(sk)->accept_q);
1373         spin_unlock(&par->accept_q_lock);
1374         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1375         sock_put(sk); /* sock_hold in smc_accept_enqueue */
1376 }
1377
1378 /* remove a sock from the accept queue to bind it to a new socket created
1379  * for a socket accept call from user space
1380  */
1381 struct sock *smc_accept_dequeue(struct sock *parent,
1382                                 struct socket *new_sock)
1383 {
1384         struct smc_sock *isk, *n;
1385         struct sock *new_sk;
1386
1387         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1388                 new_sk = (struct sock *)isk;
1389
1390                 smc_accept_unlink(new_sk);
1391                 if (new_sk->sk_state == SMC_CLOSED) {
1392                         new_sk->sk_prot->unhash(new_sk);
1393                         if (isk->clcsock) {
1394                                 sock_release(isk->clcsock);
1395                                 isk->clcsock = NULL;
1396                         }
1397                         sock_put(new_sk); /* final */
1398                         continue;
1399                 }
1400                 if (new_sock) {
1401                         sock_graft(new_sk, new_sock);
1402                         if (isk->use_fallback) {
1403                                 smc_sk(new_sk)->clcsock->file = new_sock->file;
1404                                 isk->clcsock->file->private_data = isk->clcsock;
1405                         }
1406                 }
1407                 return new_sk;
1408         }
1409         return NULL;
1410 }
1411
1412 /* clean up for a created but never accepted sock */
1413 void smc_close_non_accepted(struct sock *sk)
1414 {
1415         struct smc_sock *smc = smc_sk(sk);
1416
1417         sock_hold(sk); /* sock_put below */
1418         lock_sock(sk);
1419         if (!sk->sk_lingertime)
1420                 /* wait for peer closing */
1421                 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
1422         __smc_release(smc);
1423         release_sock(sk);
1424         sock_put(sk); /* sock_hold above */
1425         sock_put(sk); /* final sock_put */
1426 }
1427
1428 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1429 {
1430         struct smc_link *link = smc->conn.lnk;
1431         struct smc_llc_qentry *qentry;
1432         int rc;
1433
1434         if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
1435                 return SMC_CLC_DECL_ERR_REGRMB;
1436
1437         /* send CONFIRM LINK request to client over the RoCE fabric */
1438         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1439         if (rc < 0)
1440                 return SMC_CLC_DECL_TIMEOUT_CL;
1441
1442         /* receive CONFIRM LINK response from client over the RoCE fabric */
1443         qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1444                               SMC_LLC_CONFIRM_LINK);
1445         if (!qentry) {
1446                 struct smc_clc_msg_decline dclc;
1447
1448                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1449                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1450                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1451         }
1452         smc_llc_save_peer_uid(qentry);
1453         rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1454         smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1455         if (rc)
1456                 return SMC_CLC_DECL_RMBE_EC;
1457
1458         /* confirm_rkey is implicit on 1st contact */
1459         smc->conn.rmb_desc->is_conf_rkey = true;
1460
1461         smc_llc_link_active(link);
1462         smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1463
1464         /* initial contact - try to establish second link */
1465         smc_llc_srv_add_link(link);
1466         return 0;
1467 }
1468
1469 /* listen worker: finish */
1470 static void smc_listen_out(struct smc_sock *new_smc)
1471 {
1472         struct smc_sock *lsmc = new_smc->listen_smc;
1473         struct sock *newsmcsk = &new_smc->sk;
1474
1475         if (lsmc->sk.sk_state == SMC_LISTEN) {
1476                 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1477                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1478                 release_sock(&lsmc->sk);
1479         } else { /* no longer listening */
1480                 smc_close_non_accepted(newsmcsk);
1481         }
1482
1483         /* Wake up accept */
1484         lsmc->sk.sk_data_ready(&lsmc->sk);
1485         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1486 }
1487
1488 /* listen worker: finish in state connected */
1489 static void smc_listen_out_connected(struct smc_sock *new_smc)
1490 {
1491         struct sock *newsmcsk = &new_smc->sk;
1492
1493         if (newsmcsk->sk_state == SMC_INIT)
1494                 newsmcsk->sk_state = SMC_ACTIVE;
1495
1496         smc_listen_out(new_smc);
1497 }
1498
1499 /* listen worker: finish in error state */
1500 static void smc_listen_out_err(struct smc_sock *new_smc)
1501 {
1502         struct sock *newsmcsk = &new_smc->sk;
1503         struct net *net = sock_net(newsmcsk);
1504
1505         this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1506         if (newsmcsk->sk_state == SMC_INIT)
1507                 sock_put(&new_smc->sk); /* passive closing */
1508         newsmcsk->sk_state = SMC_CLOSED;
1509
1510         smc_listen_out(new_smc);
1511 }
1512
1513 /* listen worker: decline and fall back if possible */
1514 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1515                                int local_first, u8 version)
1516 {
1517         /* RDMA setup failed, switch back to TCP */
1518         smc_conn_abort(new_smc, local_first);
1519         if (reason_code < 0 ||
1520             smc_switch_to_fallback(new_smc, reason_code)) {
1521                 /* error, no fallback possible */
1522                 smc_listen_out_err(new_smc);
1523                 return;
1524         }
1525         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1526                 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1527                         smc_listen_out_err(new_smc);
1528                         return;
1529                 }
1530         }
1531         smc_listen_out_connected(new_smc);
1532 }
1533
1534 /* listen worker: version checking */
1535 static int smc_listen_v2_check(struct smc_sock *new_smc,
1536                                struct smc_clc_msg_proposal *pclc,
1537                                struct smc_init_info *ini)
1538 {
1539         struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1540         struct smc_clc_v2_extension *pclc_v2_ext;
1541         int rc = SMC_CLC_DECL_PEERNOSMC;
1542
1543         ini->smc_type_v1 = pclc->hdr.typev1;
1544         ini->smc_type_v2 = pclc->hdr.typev2;
1545         ini->smcd_version = ini->smc_type_v1 != SMC_TYPE_N ? SMC_V1 : 0;
1546         if (pclc->hdr.version > SMC_V1)
1547                 ini->smcd_version |=
1548                                 ini->smc_type_v2 != SMC_TYPE_N ? SMC_V2 : 0;
1549         if (!(ini->smcd_version & SMC_V2)) {
1550                 rc = SMC_CLC_DECL_PEERNOSMC;
1551                 goto out;
1552         }
1553         if (!smc_ism_is_v2_capable()) {
1554                 ini->smcd_version &= ~SMC_V2;
1555                 rc = SMC_CLC_DECL_NOISM2SUPP;
1556                 goto out;
1557         }
1558         pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1559         if (!pclc_v2_ext) {
1560                 ini->smcd_version &= ~SMC_V2;
1561                 rc = SMC_CLC_DECL_NOV2EXT;
1562                 goto out;
1563         }
1564         pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
1565         if (!pclc_smcd_v2_ext) {
1566                 ini->smcd_version &= ~SMC_V2;
1567                 rc = SMC_CLC_DECL_NOV2DEXT;
1568         }
1569
1570 out:
1571         if (!ini->smcd_version)
1572                 return rc;
1573
1574         return 0;
1575 }
1576
1577 /* listen worker: check prefixes */
1578 static int smc_listen_prfx_check(struct smc_sock *new_smc,
1579                                  struct smc_clc_msg_proposal *pclc)
1580 {
1581         struct smc_clc_msg_proposal_prefix *pclc_prfx;
1582         struct socket *newclcsock = new_smc->clcsock;
1583
1584         if (pclc->hdr.typev1 == SMC_TYPE_N)
1585                 return 0;
1586         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1587         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1588                 return SMC_CLC_DECL_DIFFPREFIX;
1589
1590         return 0;
1591 }
1592
1593 /* listen worker: initialize connection and buffers */
1594 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1595                                 struct smc_init_info *ini)
1596 {
1597         int rc;
1598
1599         /* allocate connection / link group */
1600         rc = smc_conn_create(new_smc, ini);
1601         if (rc)
1602                 return rc;
1603
1604         /* create send buffer and rmb */
1605         if (smc_buf_create(new_smc, false))
1606                 return SMC_CLC_DECL_MEM;
1607
1608         return 0;
1609 }
1610
1611 /* listen worker: initialize connection and buffers for SMC-D */
1612 static int smc_listen_ism_init(struct smc_sock *new_smc,
1613                                struct smc_init_info *ini)
1614 {
1615         int rc;
1616
1617         rc = smc_conn_create(new_smc, ini);
1618         if (rc)
1619                 return rc;
1620
1621         /* Create send and receive buffers */
1622         rc = smc_buf_create(new_smc, true);
1623         if (rc) {
1624                 smc_conn_abort(new_smc, ini->first_contact_local);
1625                 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
1626                                          SMC_CLC_DECL_MEM;
1627         }
1628
1629         return 0;
1630 }
1631
1632 static bool smc_is_already_selected(struct smcd_dev *smcd,
1633                                     struct smc_init_info *ini,
1634                                     int matches)
1635 {
1636         int i;
1637
1638         for (i = 0; i < matches; i++)
1639                 if (smcd == ini->ism_dev[i])
1640                         return true;
1641
1642         return false;
1643 }
1644
1645 /* check for ISM devices matching proposed ISM devices */
1646 static void smc_check_ism_v2_match(struct smc_init_info *ini,
1647                                    u16 proposed_chid, u64 proposed_gid,
1648                                    unsigned int *matches)
1649 {
1650         struct smcd_dev *smcd;
1651
1652         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1653                 if (smcd->going_away)
1654                         continue;
1655                 if (smc_is_already_selected(smcd, ini, *matches))
1656                         continue;
1657                 if (smc_ism_get_chid(smcd) == proposed_chid &&
1658                     !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
1659                         ini->ism_peer_gid[*matches] = proposed_gid;
1660                         ini->ism_dev[*matches] = smcd;
1661                         (*matches)++;
1662                         break;
1663                 }
1664         }
1665 }
1666
1667 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
1668 {
1669         if (!ini->rc)
1670                 ini->rc = rc;
1671 }
1672
1673 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
1674                                         struct smc_clc_msg_proposal *pclc,
1675                                         struct smc_init_info *ini)
1676 {
1677         struct smc_clc_smcd_v2_extension *smcd_v2_ext;
1678         struct smc_clc_v2_extension *smc_v2_ext;
1679         struct smc_clc_msg_smcd *pclc_smcd;
1680         unsigned int matches = 0;
1681         u8 smcd_version;
1682         u8 *eid = NULL;
1683         int i, rc;
1684
1685         if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
1686                 goto not_found;
1687
1688         pclc_smcd = smc_get_clc_msg_smcd(pclc);
1689         smc_v2_ext = smc_get_clc_v2_ext(pclc);
1690         smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
1691         if (!smcd_v2_ext ||
1692             !smc_v2_ext->hdr.flag.seid) { /* no system EID support for SMCD */
1693                 smc_find_ism_store_rc(SMC_CLC_DECL_NOSEID, ini);
1694                 goto not_found;
1695         }
1696
1697         mutex_lock(&smcd_dev_list.mutex);
1698         if (pclc_smcd->ism.chid)
1699                 /* check for ISM device matching proposed native ISM device */
1700                 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
1701                                        ntohll(pclc_smcd->ism.gid), &matches);
1702         for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
1703                 /* check for ISM devices matching proposed non-native ISM
1704                  * devices
1705                  */
1706                 smc_check_ism_v2_match(ini,
1707                                        ntohs(smcd_v2_ext->gidchid[i - 1].chid),
1708                                        ntohll(smcd_v2_ext->gidchid[i - 1].gid),
1709                                        &matches);
1710         }
1711         mutex_unlock(&smcd_dev_list.mutex);
1712
1713         if (ini->ism_dev[0]) {
1714                 smc_ism_get_system_eid(ini->ism_dev[0], &eid);
1715                 if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN))
1716                         goto not_found;
1717         } else {
1718                 goto not_found;
1719         }
1720
1721         /* separate - outside the smcd_dev_list.lock */
1722         smcd_version = ini->smcd_version;
1723         for (i = 0; i < matches; i++) {
1724                 ini->smcd_version = SMC_V2;
1725                 ini->is_smcd = true;
1726                 ini->ism_selected = i;
1727                 rc = smc_listen_ism_init(new_smc, ini);
1728                 if (rc) {
1729                         smc_find_ism_store_rc(rc, ini);
1730                         /* try next active ISM device */
1731                         continue;
1732                 }
1733                 return; /* matching and usable V2 ISM device found */
1734         }
1735         /* no V2 ISM device could be initialized */
1736         ini->smcd_version = smcd_version;       /* restore original value */
1737
1738 not_found:
1739         ini->smcd_version &= ~SMC_V2;
1740         ini->ism_dev[0] = NULL;
1741         ini->is_smcd = false;
1742 }
1743
1744 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
1745                                         struct smc_clc_msg_proposal *pclc,
1746                                         struct smc_init_info *ini)
1747 {
1748         struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
1749         int rc = 0;
1750
1751         /* check if ISM V1 is available */
1752         if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
1753                 goto not_found;
1754         ini->is_smcd = true; /* prepare ISM check */
1755         ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
1756         rc = smc_find_ism_device(new_smc, ini);
1757         if (rc)
1758                 goto not_found;
1759         ini->ism_selected = 0;
1760         rc = smc_listen_ism_init(new_smc, ini);
1761         if (!rc)
1762                 return;         /* V1 ISM device found */
1763
1764 not_found:
1765         smc_find_ism_store_rc(rc, ini);
1766         ini->ism_dev[0] = NULL;
1767         ini->is_smcd = false;
1768 }
1769
1770 /* listen worker: register buffers */
1771 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
1772 {
1773         struct smc_connection *conn = &new_smc->conn;
1774
1775         if (!local_first) {
1776                 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
1777                         return SMC_CLC_DECL_ERR_REGRMB;
1778         }
1779         smc_rmb_sync_sg_for_device(&new_smc->conn);
1780
1781         return 0;
1782 }
1783
1784 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
1785                                         struct smc_clc_msg_proposal *pclc,
1786                                         struct smc_init_info *ini)
1787 {
1788         int rc;
1789
1790         if (!smcr_indicated(ini->smc_type_v1))
1791                 return SMC_CLC_DECL_NOSMCDEV;
1792
1793         /* prepare RDMA check */
1794         ini->ib_lcl = &pclc->lcl;
1795         rc = smc_find_rdma_device(new_smc, ini);
1796         if (rc) {
1797                 /* no RDMA device found */
1798                 if (ini->smc_type_v1 == SMC_TYPE_B)
1799                         /* neither ISM nor RDMA device found */
1800                         rc = SMC_CLC_DECL_NOSMCDEV;
1801                 return rc;
1802         }
1803         rc = smc_listen_rdma_init(new_smc, ini);
1804         if (rc)
1805                 return rc;
1806         return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
1807 }
1808
1809 /* determine the local device matching to proposal */
1810 static int smc_listen_find_device(struct smc_sock *new_smc,
1811                                   struct smc_clc_msg_proposal *pclc,
1812                                   struct smc_init_info *ini)
1813 {
1814         int rc;
1815
1816         /* check for ISM device matching V2 proposed device */
1817         smc_find_ism_v2_device_serv(new_smc, pclc, ini);
1818         if (ini->ism_dev[0])
1819                 return 0;
1820
1821         if (!(ini->smcd_version & SMC_V1))
1822                 return ini->rc ?: SMC_CLC_DECL_NOSMCD2DEV;
1823
1824         /* check for matching IP prefix and subnet length */
1825         rc = smc_listen_prfx_check(new_smc, pclc);
1826         if (rc)
1827                 return ini->rc ?: rc;
1828
1829         /* get vlan id from IP device */
1830         if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
1831                 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
1832
1833         /* check for ISM device matching V1 proposed device */
1834         smc_find_ism_v1_device_serv(new_smc, pclc, ini);
1835         if (ini->ism_dev[0])
1836                 return 0;
1837
1838         if (pclc->hdr.typev1 == SMC_TYPE_D)
1839                 /* skip RDMA and decline */
1840                 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
1841
1842         /* check if RDMA is available */
1843         rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
1844         smc_find_ism_store_rc(rc, ini);
1845
1846         return (!rc) ? 0 : ini->rc;
1847 }
1848
1849 /* listen worker: finish RDMA setup */
1850 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1851                                   struct smc_clc_msg_accept_confirm *cclc,
1852                                   bool local_first)
1853 {
1854         struct smc_link *link = new_smc->conn.lnk;
1855         int reason_code = 0;
1856
1857         if (local_first)
1858                 smc_link_save_peer_info(link, cclc);
1859
1860         if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
1861                 return SMC_CLC_DECL_ERR_RTOK;
1862
1863         if (local_first) {
1864                 if (smc_ib_ready_link(link))
1865                         return SMC_CLC_DECL_ERR_RDYLNK;
1866                 /* QP confirmation over RoCE fabric */
1867                 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1868                 reason_code = smcr_serv_conf_first_link(new_smc);
1869                 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1870         }
1871         return reason_code;
1872 }
1873
1874 /* setup for connection of server */
1875 static void smc_listen_work(struct work_struct *work)
1876 {
1877         struct smc_sock *new_smc = container_of(work, struct smc_sock,
1878                                                 smc_listen_work);
1879         u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1880         struct socket *newclcsock = new_smc->clcsock;
1881         struct smc_clc_msg_accept_confirm *cclc;
1882         struct smc_clc_msg_proposal_area *buf;
1883         struct smc_clc_msg_proposal *pclc;
1884         struct smc_init_info *ini = NULL;
1885         int rc = 0;
1886
1887         if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1888                 return smc_listen_out_err(new_smc);
1889
1890         if (new_smc->use_fallback) {
1891                 smc_listen_out_connected(new_smc);
1892                 return;
1893         }
1894
1895         /* check if peer is smc capable */
1896         if (!tcp_sk(newclcsock->sk)->syn_smc) {
1897                 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
1898                 if (rc)
1899                         smc_listen_out_err(new_smc);
1900                 else
1901                         smc_listen_out_connected(new_smc);
1902                 return;
1903         }
1904
1905         /* do inband token exchange -
1906          * wait for and receive SMC Proposal CLC message
1907          */
1908         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
1909         if (!buf) {
1910                 rc = SMC_CLC_DECL_MEM;
1911                 goto out_decl;
1912         }
1913         pclc = (struct smc_clc_msg_proposal *)buf;
1914         rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
1915                               SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1916         if (rc)
1917                 goto out_decl;
1918         version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version;
1919
1920         /* IPSec connections opt out of SMC optimizations */
1921         if (using_ipsec(new_smc)) {
1922                 rc = SMC_CLC_DECL_IPSEC;
1923                 goto out_decl;
1924         }
1925
1926         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1927         if (!ini) {
1928                 rc = SMC_CLC_DECL_MEM;
1929                 goto out_decl;
1930         }
1931
1932         /* initial version checking */
1933         rc = smc_listen_v2_check(new_smc, pclc, ini);
1934         if (rc)
1935                 goto out_decl;
1936
1937         mutex_lock(&smc_server_lgr_pending);
1938         smc_close_init(new_smc);
1939         smc_rx_init(new_smc);
1940         smc_tx_init(new_smc);
1941
1942         /* determine ISM or RoCE device used for connection */
1943         rc = smc_listen_find_device(new_smc, pclc, ini);
1944         if (rc)
1945                 goto out_unlock;
1946
1947         /* send SMC Accept CLC message */
1948         rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
1949                                  ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1);
1950         if (rc)
1951                 goto out_unlock;
1952
1953         /* SMC-D does not need this lock any more */
1954         if (ini->is_smcd)
1955                 mutex_unlock(&smc_server_lgr_pending);
1956
1957         /* receive SMC Confirm CLC message */
1958         memset(buf, 0, sizeof(*buf));
1959         cclc = (struct smc_clc_msg_accept_confirm *)buf;
1960         rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
1961                               SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1962         if (rc) {
1963                 if (!ini->is_smcd)
1964                         goto out_unlock;
1965                 goto out_decl;
1966         }
1967
1968         /* finish worker */
1969         if (!ini->is_smcd) {
1970                 rc = smc_listen_rdma_finish(new_smc, cclc,
1971                                             ini->first_contact_local);
1972                 if (rc)
1973                         goto out_unlock;
1974                 mutex_unlock(&smc_server_lgr_pending);
1975         }
1976         smc_conn_save_peer_info(new_smc, cclc);
1977         smc_listen_out_connected(new_smc);
1978         SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
1979         goto out_free;
1980
1981 out_unlock:
1982         mutex_unlock(&smc_server_lgr_pending);
1983 out_decl:
1984         smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
1985                            version);
1986 out_free:
1987         kfree(ini);
1988         kfree(buf);
1989 }
1990
1991 static void smc_tcp_listen_work(struct work_struct *work)
1992 {
1993         struct smc_sock *lsmc = container_of(work, struct smc_sock,
1994                                              tcp_listen_work);
1995         struct sock *lsk = &lsmc->sk;
1996         struct smc_sock *new_smc;
1997         int rc = 0;
1998
1999         lock_sock(lsk);
2000         while (lsk->sk_state == SMC_LISTEN) {
2001                 rc = smc_clcsock_accept(lsmc, &new_smc);
2002                 if (rc) /* clcsock accept queue empty or error */
2003                         goto out;
2004                 if (!new_smc)
2005                         continue;
2006
2007                 new_smc->listen_smc = lsmc;
2008                 new_smc->use_fallback = lsmc->use_fallback;
2009                 new_smc->fallback_rsn = lsmc->fallback_rsn;
2010                 sock_hold(lsk); /* sock_put in smc_listen_work */
2011                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2012                 smc_copy_sock_settings_to_smc(new_smc);
2013                 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
2014                 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
2015                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
2016                 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
2017                         sock_put(&new_smc->sk);
2018         }
2019
2020 out:
2021         release_sock(lsk);
2022         sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2023 }
2024
2025 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2026 {
2027         struct smc_sock *lsmc =
2028                 smc_clcsock_user_data(listen_clcsock);
2029
2030         if (!lsmc)
2031                 return;
2032         lsmc->clcsk_data_ready(listen_clcsock);
2033         if (lsmc->sk.sk_state == SMC_LISTEN) {
2034                 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
2035                 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work))
2036                         sock_put(&lsmc->sk);
2037         }
2038 }
2039
2040 static int smc_listen(struct socket *sock, int backlog)
2041 {
2042         struct sock *sk = sock->sk;
2043         struct smc_sock *smc;
2044         int rc;
2045
2046         smc = smc_sk(sk);
2047         lock_sock(sk);
2048
2049         rc = -EINVAL;
2050         if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2051             smc->connect_nonblock)
2052                 goto out;
2053
2054         rc = 0;
2055         if (sk->sk_state == SMC_LISTEN) {
2056                 sk->sk_max_ack_backlog = backlog;
2057                 goto out;
2058         }
2059         /* some socket options are handled in core, so we could not apply
2060          * them to the clc socket -- copy smc socket options to clc socket
2061          */
2062         smc_copy_sock_settings_to_clc(smc);
2063         if (!smc->use_fallback)
2064                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
2065
2066         /* save original sk_data_ready function and establish
2067          * smc-specific sk_data_ready function
2068          */
2069         smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready;
2070         smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready;
2071         smc->clcsock->sk->sk_user_data =
2072                 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
2073         rc = kernel_listen(smc->clcsock, backlog);
2074         if (rc) {
2075                 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
2076                 goto out;
2077         }
2078         sk->sk_max_ack_backlog = backlog;
2079         sk->sk_ack_backlog = 0;
2080         sk->sk_state = SMC_LISTEN;
2081
2082 out:
2083         release_sock(sk);
2084         return rc;
2085 }
2086
2087 static int smc_accept(struct socket *sock, struct socket *new_sock,
2088                       int flags, bool kern)
2089 {
2090         struct sock *sk = sock->sk, *nsk;
2091         DECLARE_WAITQUEUE(wait, current);
2092         struct smc_sock *lsmc;
2093         long timeo;
2094         int rc = 0;
2095
2096         lsmc = smc_sk(sk);
2097         sock_hold(sk); /* sock_put below */
2098         lock_sock(sk);
2099
2100         if (lsmc->sk.sk_state != SMC_LISTEN) {
2101                 rc = -EINVAL;
2102                 release_sock(sk);
2103                 goto out;
2104         }
2105
2106         /* Wait for an incoming connection */
2107         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2108         add_wait_queue_exclusive(sk_sleep(sk), &wait);
2109         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2110                 set_current_state(TASK_INTERRUPTIBLE);
2111                 if (!timeo) {
2112                         rc = -EAGAIN;
2113                         break;
2114                 }
2115                 release_sock(sk);
2116                 timeo = schedule_timeout(timeo);
2117                 /* wakeup by sk_data_ready in smc_listen_work() */
2118                 sched_annotate_sleep();
2119                 lock_sock(sk);
2120                 if (signal_pending(current)) {
2121                         rc = sock_intr_errno(timeo);
2122                         break;
2123                 }
2124         }
2125         set_current_state(TASK_RUNNING);
2126         remove_wait_queue(sk_sleep(sk), &wait);
2127
2128         if (!rc)
2129                 rc = sock_error(nsk);
2130         release_sock(sk);
2131         if (rc)
2132                 goto out;
2133
2134         if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2135                 /* wait till data arrives on the socket */
2136                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2137                                                                 MSEC_PER_SEC);
2138                 if (smc_sk(nsk)->use_fallback) {
2139                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2140
2141                         lock_sock(clcsk);
2142                         if (skb_queue_empty(&clcsk->sk_receive_queue))
2143                                 sk_wait_data(clcsk, &timeo, NULL);
2144                         release_sock(clcsk);
2145                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2146                         lock_sock(nsk);
2147                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
2148                         release_sock(nsk);
2149                 }
2150         }
2151
2152 out:
2153         sock_put(sk); /* sock_hold above */
2154         return rc;
2155 }
2156
2157 static int smc_getname(struct socket *sock, struct sockaddr *addr,
2158                        int peer)
2159 {
2160         struct smc_sock *smc;
2161
2162         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2163             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2164                 return -ENOTCONN;
2165
2166         smc = smc_sk(sock->sk);
2167
2168         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2169 }
2170
2171 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2172 {
2173         struct sock *sk = sock->sk;
2174         struct smc_sock *smc;
2175         int rc;
2176
2177         smc = smc_sk(sk);
2178         lock_sock(sk);
2179
2180         /* SMC does not support connect with fastopen */
2181         if (msg->msg_flags & MSG_FASTOPEN) {
2182                 /* not connected yet, fallback */
2183                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2184                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2185                         if (rc)
2186                                 goto out;
2187                 } else {
2188                         rc = -EINVAL;
2189                         goto out;
2190                 }
2191         } else if ((sk->sk_state != SMC_ACTIVE) &&
2192                    (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2193                    (sk->sk_state != SMC_INIT)) {
2194                 rc = -EPIPE;
2195                 goto out;
2196         }
2197
2198         if (smc->use_fallback) {
2199                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2200         } else {
2201                 rc = smc_tx_sendmsg(smc, msg, len);
2202                 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2203         }
2204 out:
2205         release_sock(sk);
2206         return rc;
2207 }
2208
2209 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2210                        int flags)
2211 {
2212         struct sock *sk = sock->sk;
2213         struct smc_sock *smc;
2214         int rc = -ENOTCONN;
2215
2216         smc = smc_sk(sk);
2217         lock_sock(sk);
2218         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2219                 /* socket was connected before, no more data to read */
2220                 rc = 0;
2221                 goto out;
2222         }
2223         if ((sk->sk_state == SMC_INIT) ||
2224             (sk->sk_state == SMC_LISTEN) ||
2225             (sk->sk_state == SMC_CLOSED))
2226                 goto out;
2227
2228         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2229                 rc = 0;
2230                 goto out;
2231         }
2232
2233         if (smc->use_fallback) {
2234                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2235         } else {
2236                 msg->msg_namelen = 0;
2237                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2238                 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2239         }
2240
2241 out:
2242         release_sock(sk);
2243         return rc;
2244 }
2245
2246 static __poll_t smc_accept_poll(struct sock *parent)
2247 {
2248         struct smc_sock *isk = smc_sk(parent);
2249         __poll_t mask = 0;
2250
2251         spin_lock(&isk->accept_q_lock);
2252         if (!list_empty(&isk->accept_q))
2253                 mask = EPOLLIN | EPOLLRDNORM;
2254         spin_unlock(&isk->accept_q_lock);
2255
2256         return mask;
2257 }
2258
2259 static __poll_t smc_poll(struct file *file, struct socket *sock,
2260                              poll_table *wait)
2261 {
2262         struct sock *sk = sock->sk;
2263         struct smc_sock *smc;
2264         __poll_t mask = 0;
2265
2266         if (!sk)
2267                 return EPOLLNVAL;
2268
2269         smc = smc_sk(sock->sk);
2270         if (smc->use_fallback) {
2271                 /* delegate to CLC child sock */
2272                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2273                 sk->sk_err = smc->clcsock->sk->sk_err;
2274         } else {
2275                 if (sk->sk_state != SMC_CLOSED)
2276                         sock_poll_wait(file, sock, wait);
2277                 if (sk->sk_err)
2278                         mask |= EPOLLERR;
2279                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2280                     (sk->sk_state == SMC_CLOSED))
2281                         mask |= EPOLLHUP;
2282                 if (sk->sk_state == SMC_LISTEN) {
2283                         /* woken up by sk_data_ready in smc_listen_work() */
2284                         mask |= smc_accept_poll(sk);
2285                 } else if (smc->use_fallback) { /* as result of connect_work()*/
2286                         mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2287                                                            wait);
2288                         sk->sk_err = smc->clcsock->sk->sk_err;
2289                 } else {
2290                         if ((sk->sk_state != SMC_INIT &&
2291                              atomic_read(&smc->conn.sndbuf_space)) ||
2292                             sk->sk_shutdown & SEND_SHUTDOWN) {
2293                                 mask |= EPOLLOUT | EPOLLWRNORM;
2294                         } else {
2295                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2296                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2297                         }
2298                         if (atomic_read(&smc->conn.bytes_to_rcv))
2299                                 mask |= EPOLLIN | EPOLLRDNORM;
2300                         if (sk->sk_shutdown & RCV_SHUTDOWN)
2301                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2302                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
2303                                 mask |= EPOLLIN;
2304                         if (smc->conn.urg_state == SMC_URG_VALID)
2305                                 mask |= EPOLLPRI;
2306                 }
2307         }
2308
2309         return mask;
2310 }
2311
2312 static int smc_shutdown(struct socket *sock, int how)
2313 {
2314         struct sock *sk = sock->sk;
2315         bool do_shutdown = true;
2316         struct smc_sock *smc;
2317         int rc = -EINVAL;
2318         int old_state;
2319         int rc1 = 0;
2320
2321         smc = smc_sk(sk);
2322
2323         if ((how < SHUT_RD) || (how > SHUT_RDWR))
2324                 return rc;
2325
2326         lock_sock(sk);
2327
2328         rc = -ENOTCONN;
2329         if ((sk->sk_state != SMC_ACTIVE) &&
2330             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2331             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2332             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2333             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2334             (sk->sk_state != SMC_APPFINCLOSEWAIT))
2335                 goto out;
2336         if (smc->use_fallback) {
2337                 rc = kernel_sock_shutdown(smc->clcsock, how);
2338                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2339                 if (sk->sk_shutdown == SHUTDOWN_MASK) {
2340                         sk->sk_state = SMC_CLOSED;
2341                         sock_put(sk);
2342                 }
2343                 goto out;
2344         }
2345         switch (how) {
2346         case SHUT_RDWR:         /* shutdown in both directions */
2347                 old_state = sk->sk_state;
2348                 rc = smc_close_active(smc);
2349                 if (old_state == SMC_ACTIVE &&
2350                     sk->sk_state == SMC_PEERCLOSEWAIT1)
2351                         do_shutdown = false;
2352                 break;
2353         case SHUT_WR:
2354                 rc = smc_close_shutdown_write(smc);
2355                 break;
2356         case SHUT_RD:
2357                 rc = 0;
2358                 /* nothing more to do because peer is not involved */
2359                 break;
2360         }
2361         if (do_shutdown && smc->clcsock)
2362                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2363         /* map sock_shutdown_cmd constants to sk_shutdown value range */
2364         sk->sk_shutdown |= how + 1;
2365
2366 out:
2367         release_sock(sk);
2368         return rc ? rc : rc1;
2369 }
2370
2371 static int smc_setsockopt(struct socket *sock, int level, int optname,
2372                           sockptr_t optval, unsigned int optlen)
2373 {
2374         struct sock *sk = sock->sk;
2375         struct smc_sock *smc;
2376         int val, rc;
2377
2378         if (level == SOL_TCP && optname == TCP_ULP)
2379                 return -EOPNOTSUPP;
2380
2381         smc = smc_sk(sk);
2382
2383         /* generic setsockopts reaching us here always apply to the
2384          * CLC socket
2385          */
2386         mutex_lock(&smc->clcsock_release_lock);
2387         if (!smc->clcsock) {
2388                 mutex_unlock(&smc->clcsock_release_lock);
2389                 return -EBADF;
2390         }
2391         if (unlikely(!smc->clcsock->ops->setsockopt))
2392                 rc = -EOPNOTSUPP;
2393         else
2394                 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
2395                                                    optval, optlen);
2396         if (smc->clcsock->sk->sk_err) {
2397                 sk->sk_err = smc->clcsock->sk->sk_err;
2398                 sk_error_report(sk);
2399         }
2400         mutex_unlock(&smc->clcsock_release_lock);
2401
2402         if (optlen < sizeof(int))
2403                 return -EINVAL;
2404         if (copy_from_sockptr(&val, optval, sizeof(int)))
2405                 return -EFAULT;
2406
2407         lock_sock(sk);
2408         if (rc || smc->use_fallback)
2409                 goto out;
2410         switch (optname) {
2411         case TCP_FASTOPEN:
2412         case TCP_FASTOPEN_CONNECT:
2413         case TCP_FASTOPEN_KEY:
2414         case TCP_FASTOPEN_NO_COOKIE:
2415                 /* option not supported by SMC */
2416                 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2417                         rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2418                 } else {
2419                         rc = -EINVAL;
2420                 }
2421                 break;
2422         case TCP_NODELAY:
2423                 if (sk->sk_state != SMC_INIT &&
2424                     sk->sk_state != SMC_LISTEN &&
2425                     sk->sk_state != SMC_CLOSED) {
2426                         if (val) {
2427                                 SMC_STAT_INC(smc, ndly_cnt);
2428                                 smc_tx_pending(&smc->conn);
2429                                 cancel_delayed_work(&smc->conn.tx_work);
2430                         }
2431                 }
2432                 break;
2433         case TCP_CORK:
2434                 if (sk->sk_state != SMC_INIT &&
2435                     sk->sk_state != SMC_LISTEN &&
2436                     sk->sk_state != SMC_CLOSED) {
2437                         if (!val) {
2438                                 SMC_STAT_INC(smc, cork_cnt);
2439                                 smc_tx_pending(&smc->conn);
2440                                 cancel_delayed_work(&smc->conn.tx_work);
2441                         }
2442                 }
2443                 break;
2444         case TCP_DEFER_ACCEPT:
2445                 smc->sockopt_defer_accept = val;
2446                 break;
2447         default:
2448                 break;
2449         }
2450 out:
2451         release_sock(sk);
2452
2453         return rc;
2454 }
2455
2456 static int smc_getsockopt(struct socket *sock, int level, int optname,
2457                           char __user *optval, int __user *optlen)
2458 {
2459         struct smc_sock *smc;
2460         int rc;
2461
2462         smc = smc_sk(sock->sk);
2463         mutex_lock(&smc->clcsock_release_lock);
2464         if (!smc->clcsock) {
2465                 mutex_unlock(&smc->clcsock_release_lock);
2466                 return -EBADF;
2467         }
2468         /* socket options apply to the CLC socket */
2469         if (unlikely(!smc->clcsock->ops->getsockopt)) {
2470                 mutex_unlock(&smc->clcsock_release_lock);
2471                 return -EOPNOTSUPP;
2472         }
2473         rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
2474                                            optval, optlen);
2475         mutex_unlock(&smc->clcsock_release_lock);
2476         return rc;
2477 }
2478
2479 static int smc_ioctl(struct socket *sock, unsigned int cmd,
2480                      unsigned long arg)
2481 {
2482         union smc_host_cursor cons, urg;
2483         struct smc_connection *conn;
2484         struct smc_sock *smc;
2485         int answ;
2486
2487         smc = smc_sk(sock->sk);
2488         conn = &smc->conn;
2489         lock_sock(&smc->sk);
2490         if (smc->use_fallback) {
2491                 if (!smc->clcsock) {
2492                         release_sock(&smc->sk);
2493                         return -EBADF;
2494                 }
2495                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
2496                 release_sock(&smc->sk);
2497                 return answ;
2498         }
2499         switch (cmd) {
2500         case SIOCINQ: /* same as FIONREAD */
2501                 if (smc->sk.sk_state == SMC_LISTEN) {
2502                         release_sock(&smc->sk);
2503                         return -EINVAL;
2504                 }
2505                 if (smc->sk.sk_state == SMC_INIT ||
2506                     smc->sk.sk_state == SMC_CLOSED)
2507                         answ = 0;
2508                 else
2509                         answ = atomic_read(&smc->conn.bytes_to_rcv);
2510                 break;
2511         case SIOCOUTQ:
2512                 /* output queue size (not send + not acked) */
2513                 if (smc->sk.sk_state == SMC_LISTEN) {
2514                         release_sock(&smc->sk);
2515                         return -EINVAL;
2516                 }
2517                 if (smc->sk.sk_state == SMC_INIT ||
2518                     smc->sk.sk_state == SMC_CLOSED)
2519                         answ = 0;
2520                 else
2521                         answ = smc->conn.sndbuf_desc->len -
2522                                         atomic_read(&smc->conn.sndbuf_space);
2523                 break;
2524         case SIOCOUTQNSD:
2525                 /* output queue size (not send only) */
2526                 if (smc->sk.sk_state == SMC_LISTEN) {
2527                         release_sock(&smc->sk);
2528                         return -EINVAL;
2529                 }
2530                 if (smc->sk.sk_state == SMC_INIT ||
2531                     smc->sk.sk_state == SMC_CLOSED)
2532                         answ = 0;
2533                 else
2534                         answ = smc_tx_prepared_sends(&smc->conn);
2535                 break;
2536         case SIOCATMARK:
2537                 if (smc->sk.sk_state == SMC_LISTEN) {
2538                         release_sock(&smc->sk);
2539                         return -EINVAL;
2540                 }
2541                 if (smc->sk.sk_state == SMC_INIT ||
2542                     smc->sk.sk_state == SMC_CLOSED) {
2543                         answ = 0;
2544                 } else {
2545                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
2546                         smc_curs_copy(&urg, &conn->urg_curs, conn);
2547                         answ = smc_curs_diff(conn->rmb_desc->len,
2548                                              &cons, &urg) == 1;
2549                 }
2550                 break;
2551         default:
2552                 release_sock(&smc->sk);
2553                 return -ENOIOCTLCMD;
2554         }
2555         release_sock(&smc->sk);
2556
2557         return put_user(answ, (int __user *)arg);
2558 }
2559
2560 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
2561                             int offset, size_t size, int flags)
2562 {
2563         struct sock *sk = sock->sk;
2564         struct smc_sock *smc;
2565         int rc = -EPIPE;
2566
2567         smc = smc_sk(sk);
2568         lock_sock(sk);
2569         if (sk->sk_state != SMC_ACTIVE) {
2570                 release_sock(sk);
2571                 goto out;
2572         }
2573         release_sock(sk);
2574         if (smc->use_fallback) {
2575                 rc = kernel_sendpage(smc->clcsock, page, offset,
2576                                      size, flags);
2577         } else {
2578                 SMC_STAT_INC(smc, sendpage_cnt);
2579                 rc = sock_no_sendpage(sock, page, offset, size, flags);
2580         }
2581
2582 out:
2583         return rc;
2584 }
2585
2586 /* Map the affected portions of the rmbe into an spd, note the number of bytes
2587  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
2588  * updates till whenever a respective page has been fully processed.
2589  * Note that subsequent recv() calls have to wait till all splice() processing
2590  * completed.
2591  */
2592 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
2593                                struct pipe_inode_info *pipe, size_t len,
2594                                unsigned int flags)
2595 {
2596         struct sock *sk = sock->sk;
2597         struct smc_sock *smc;
2598         int rc = -ENOTCONN;
2599
2600         smc = smc_sk(sk);
2601         lock_sock(sk);
2602         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2603                 /* socket was connected before, no more data to read */
2604                 rc = 0;
2605                 goto out;
2606         }
2607         if (sk->sk_state == SMC_INIT ||
2608             sk->sk_state == SMC_LISTEN ||
2609             sk->sk_state == SMC_CLOSED)
2610                 goto out;
2611
2612         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2613                 rc = 0;
2614                 goto out;
2615         }
2616
2617         if (smc->use_fallback) {
2618                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
2619                                                     pipe, len, flags);
2620         } else {
2621                 if (*ppos) {
2622                         rc = -ESPIPE;
2623                         goto out;
2624                 }
2625                 if (flags & SPLICE_F_NONBLOCK)
2626                         flags = MSG_DONTWAIT;
2627                 else
2628                         flags = 0;
2629                 SMC_STAT_INC(smc, splice_cnt);
2630                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
2631         }
2632 out:
2633         release_sock(sk);
2634
2635         return rc;
2636 }
2637
2638 /* must look like tcp */
2639 static const struct proto_ops smc_sock_ops = {
2640         .family         = PF_SMC,
2641         .owner          = THIS_MODULE,
2642         .release        = smc_release,
2643         .bind           = smc_bind,
2644         .connect        = smc_connect,
2645         .socketpair     = sock_no_socketpair,
2646         .accept         = smc_accept,
2647         .getname        = smc_getname,
2648         .poll           = smc_poll,
2649         .ioctl          = smc_ioctl,
2650         .listen         = smc_listen,
2651         .shutdown       = smc_shutdown,
2652         .setsockopt     = smc_setsockopt,
2653         .getsockopt     = smc_getsockopt,
2654         .sendmsg        = smc_sendmsg,
2655         .recvmsg        = smc_recvmsg,
2656         .mmap           = sock_no_mmap,
2657         .sendpage       = smc_sendpage,
2658         .splice_read    = smc_splice_read,
2659 };
2660
2661 static int smc_create(struct net *net, struct socket *sock, int protocol,
2662                       int kern)
2663 {
2664         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
2665         struct smc_sock *smc;
2666         struct sock *sk;
2667         int rc;
2668
2669         rc = -ESOCKTNOSUPPORT;
2670         if (sock->type != SOCK_STREAM)
2671                 goto out;
2672
2673         rc = -EPROTONOSUPPORT;
2674         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
2675                 goto out;
2676
2677         rc = -ENOBUFS;
2678         sock->ops = &smc_sock_ops;
2679         sk = smc_sock_alloc(net, sock, protocol);
2680         if (!sk)
2681                 goto out;
2682
2683         /* create internal TCP socket for CLC handshake and fallback */
2684         smc = smc_sk(sk);
2685         smc->use_fallback = false; /* assume rdma capability first */
2686         smc->fallback_rsn = 0;
2687         rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
2688                               &smc->clcsock);
2689         if (rc) {
2690                 sk_common_release(sk);
2691                 goto out;
2692         }
2693         smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
2694         smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
2695
2696 out:
2697         return rc;
2698 }
2699
2700 static const struct net_proto_family smc_sock_family_ops = {
2701         .family = PF_SMC,
2702         .owner  = THIS_MODULE,
2703         .create = smc_create,
2704 };
2705
2706 unsigned int smc_net_id;
2707
2708 static __net_init int smc_net_init(struct net *net)
2709 {
2710         return smc_pnet_net_init(net);
2711 }
2712
2713 static void __net_exit smc_net_exit(struct net *net)
2714 {
2715         smc_pnet_net_exit(net);
2716 }
2717
2718 static __net_init int smc_net_stat_init(struct net *net)
2719 {
2720         return smc_stats_init(net);
2721 }
2722
2723 static void __net_exit smc_net_stat_exit(struct net *net)
2724 {
2725         smc_stats_exit(net);
2726 }
2727
2728 static struct pernet_operations smc_net_ops = {
2729         .init = smc_net_init,
2730         .exit = smc_net_exit,
2731         .id   = &smc_net_id,
2732         .size = sizeof(struct smc_net),
2733 };
2734
2735 static struct pernet_operations smc_net_stat_ops = {
2736         .init = smc_net_stat_init,
2737         .exit = smc_net_stat_exit,
2738 };
2739
2740 static int __init smc_init(void)
2741 {
2742         int rc;
2743
2744         rc = register_pernet_subsys(&smc_net_ops);
2745         if (rc)
2746                 return rc;
2747
2748         rc = register_pernet_subsys(&smc_net_stat_ops);
2749         if (rc)
2750                 goto out_pernet_subsys;
2751
2752         smc_ism_init();
2753         smc_clc_init();
2754
2755         rc = smc_nl_init();
2756         if (rc)
2757                 goto out_pernet_subsys_stat;
2758
2759         rc = smc_pnet_init();
2760         if (rc)
2761                 goto out_nl;
2762
2763         rc = -ENOMEM;
2764         smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
2765         if (!smc_hs_wq)
2766                 goto out_pnet;
2767
2768         smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
2769         if (!smc_close_wq)
2770                 goto out_alloc_hs_wq;
2771
2772         rc = smc_core_init();
2773         if (rc) {
2774                 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
2775                 goto out_alloc_wqs;
2776         }
2777
2778         rc = smc_llc_init();
2779         if (rc) {
2780                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2781                 goto out_core;
2782         }
2783
2784         rc = smc_cdc_init();
2785         if (rc) {
2786                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2787                 goto out_core;
2788         }
2789
2790         rc = proto_register(&smc_proto, 1);
2791         if (rc) {
2792                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2793                 goto out_core;
2794         }
2795
2796         rc = proto_register(&smc_proto6, 1);
2797         if (rc) {
2798                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2799                 goto out_proto;
2800         }
2801
2802         rc = sock_register(&smc_sock_family_ops);
2803         if (rc) {
2804                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2805                 goto out_proto6;
2806         }
2807         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2808         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2809
2810         rc = smc_ib_register_client();
2811         if (rc) {
2812                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2813                 goto out_sock;
2814         }
2815
2816         static_branch_enable(&tcp_have_smc);
2817         return 0;
2818
2819 out_sock:
2820         sock_unregister(PF_SMC);
2821 out_proto6:
2822         proto_unregister(&smc_proto6);
2823 out_proto:
2824         proto_unregister(&smc_proto);
2825 out_core:
2826         smc_core_exit();
2827 out_alloc_wqs:
2828         destroy_workqueue(smc_close_wq);
2829 out_alloc_hs_wq:
2830         destroy_workqueue(smc_hs_wq);
2831 out_pnet:
2832         smc_pnet_exit();
2833 out_nl:
2834         smc_nl_exit();
2835 out_pernet_subsys_stat:
2836         unregister_pernet_subsys(&smc_net_stat_ops);
2837 out_pernet_subsys:
2838         unregister_pernet_subsys(&smc_net_ops);
2839
2840         return rc;
2841 }
2842
2843 static void __exit smc_exit(void)
2844 {
2845         static_branch_disable(&tcp_have_smc);
2846         sock_unregister(PF_SMC);
2847         smc_core_exit();
2848         smc_ib_unregister_client();
2849         destroy_workqueue(smc_close_wq);
2850         destroy_workqueue(smc_hs_wq);
2851         proto_unregister(&smc_proto6);
2852         proto_unregister(&smc_proto);
2853         smc_pnet_exit();
2854         smc_nl_exit();
2855         unregister_pernet_subsys(&smc_net_stat_ops);
2856         unregister_pernet_subsys(&smc_net_ops);
2857         rcu_barrier();
2858 }
2859
2860 module_init(smc_init);
2861 module_exit(smc_exit);
2862
2863 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2864 MODULE_DESCRIPTION("smc socket address family");
2865 MODULE_LICENSE("GPL");
2866 MODULE_ALIAS_NETPROTO(PF_SMC);