net/smc/af_smc.c

   1 /*
   2  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   3  *
   4  *  AF_SMC protocol family socket handler keeping the AF_INET sock address type
   5  *  applies to SOCK_STREAM sockets only
   6  *  offers an alternative communication option for TCP-protocol sockets
   7  *  applicable with RoCE-cards only
   8  *
   9  *  Initial restrictions:
  10  *    - support for alternate links postponed
  11  *
  12  *  Copyright IBM Corp. 2016, 2018
  13  *
  14  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  15  *              based on prototype from Frank Blaschka
  16  */
  17
  18 #define KMSG_COMPONENT "smc"
  19 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  20
  21 #include <linux/module.h>
  22 #include <linux/socket.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/in.h>
  25 #include <linux/sched/signal.h>
  26 #include <linux/if_vlan.h>
  27
  28 #include <net/sock.h>
  29 #include <net/tcp.h>
  30 #include <net/smc.h>
  31 #include <asm/ioctls.h>
  32
  33 #include <net/net_namespace.h>
  34 #include <net/netns/generic.h>
  35 #include "smc_netns.h"
  36
  37 #include "smc.h"
  38 #include "smc_clc.h"
  39 #include "smc_llc.h"
  40 #include "smc_cdc.h"
  41 #include "smc_core.h"
  42 #include "smc_ib.h"
  43 #include "smc_ism.h"
  44 #include "smc_pnet.h"
  45 #include "smc_tx.h"
  46 #include "smc_rx.h"
  47 #include "smc_close.h"
  48
  49 static DEFINE_MUTEX(smc_server_lgr_pending);    /* serialize link group
  50                                                  * creation on server
  51                                                  */
  52 static DEFINE_MUTEX(smc_client_lgr_pending);    /* serialize link group
  53                                                  * creation on client
  54                                                  */
  55
  56 static void smc_tcp_listen_work(struct work_struct *);
  57 static void smc_connect_work(struct work_struct *);
  58
  59 static void smc_set_keepalive(struct sock *sk, int val)
  60 {
  61         struct smc_sock *smc = smc_sk(sk);
  62
  63         smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
  64 }
  65
  66 static struct smc_hashinfo smc_v4_hashinfo = {
  67         .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
  68 };
  69
  70 static struct smc_hashinfo smc_v6_hashinfo = {
  71         .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
  72 };
  73
  74 int smc_hash_sk(struct sock *sk)
  75 {
  76         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
  77         struct hlist_head *head;
  78
  79         head = &h->ht;
  80
  81         write_lock_bh(&h->lock);
  82         sk_add_node(sk, head);
  83         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  84         write_unlock_bh(&h->lock);
  85
  86         return 0;
  87 }
  88 EXPORT_SYMBOL_GPL(smc_hash_sk);
  89
  90 void smc_unhash_sk(struct sock *sk)
  91 {
  92         struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
  93
  94         write_lock_bh(&h->lock);
  95         if (sk_del_node_init(sk))
  96                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
  97         write_unlock_bh(&h->lock);
  98 }
  99 EXPORT_SYMBOL_GPL(smc_unhash_sk);
 100
 101 struct proto smc_proto = {
 102         .name           = "SMC",
 103         .owner          = THIS_MODULE,
 104         .keepalive      = smc_set_keepalive,
 105         .hash           = smc_hash_sk,
 106         .unhash         = smc_unhash_sk,
 107         .obj_size       = sizeof(struct smc_sock),
 108         .h.smc_hash     = &smc_v4_hashinfo,
 109         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 110 };
 111 EXPORT_SYMBOL_GPL(smc_proto);
 112
 113 struct proto smc_proto6 = {
 114         .name           = "SMC6",
 115         .owner          = THIS_MODULE,
 116         .keepalive      = smc_set_keepalive,
 117         .hash           = smc_hash_sk,
 118         .unhash         = smc_unhash_sk,
 119         .obj_size       = sizeof(struct smc_sock),
 120         .h.smc_hash     = &smc_v6_hashinfo,
 121         .slab_flags     = SLAB_TYPESAFE_BY_RCU,
 122 };
 123 EXPORT_SYMBOL_GPL(smc_proto6);
 124
 125 static int smc_release(struct socket *sock)
 126 {
 127         struct sock *sk = sock->sk;
 128         struct smc_sock *smc;
 129         int rc = 0;
 130
 131         if (!sk)
 132                 goto out;
 133
 134         smc = smc_sk(sk);
 135
 136         /* cleanup for a dangling non-blocking connect */
 137         if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
 138                 tcp_abort(smc->clcsock->sk, ECONNABORTED);
 139         flush_work(&smc->connect_work);
 140
 141         if (sk->sk_state == SMC_LISTEN)
 142                 /* smc_close_non_accepted() is called and acquires
 143                  * sock lock for child sockets again
 144                  */
 145                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 146         else
 147                 lock_sock(sk);
 148
 149         if (!smc->use_fallback) {
 150                 rc = smc_close_active(smc);
 151                 sock_set_flag(sk, SOCK_DEAD);
 152                 sk->sk_shutdown |= SHUTDOWN_MASK;
 153         } else {
 154                 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
 155                         sock_put(sk); /* passive closing */
 156                 if (sk->sk_state == SMC_LISTEN) {
 157                         /* wake up clcsock accept */
 158                         rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
 159                 }
 160                 sk->sk_state = SMC_CLOSED;
 161                 sk->sk_state_change(sk);
 162         }
 163
 164         sk->sk_prot->unhash(sk);
 165
 166         if (sk->sk_state == SMC_CLOSED) {
 167                 if (smc->clcsock) {
 168                         mutex_lock(&smc->clcsock_release_lock);
 169                         sock_release(smc->clcsock);
 170                         smc->clcsock = NULL;
 171                         mutex_unlock(&smc->clcsock_release_lock);
 172                 }
 173                 if (!smc->use_fallback)
 174                         smc_conn_free(&smc->conn);
 175         }
 176
 177         /* detach socket */
 178         sock_orphan(sk);
 179         sock->sk = NULL;
 180         release_sock(sk);
 181
 182         sock_put(sk); /* final sock_put */
 183 out:
 184         return rc;
 185 }
 186
 187 static void smc_destruct(struct sock *sk)
 188 {
 189         if (sk->sk_state != SMC_CLOSED)
 190                 return;
 191         if (!sock_flag(sk, SOCK_DEAD))
 192                 return;
 193
 194         sk_refcnt_debug_dec(sk);
 195 }
 196
 197 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
 198                                    int protocol)
 199 {
 200         struct smc_sock *smc;
 201         struct proto *prot;
 202         struct sock *sk;
 203
 204         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
 205         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
 206         if (!sk)
 207                 return NULL;
 208
 209         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
 210         sk->sk_state = SMC_INIT;
 211         sk->sk_destruct = smc_destruct;
 212         sk->sk_protocol = protocol;
 213         smc = smc_sk(sk);
 214         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
 215         INIT_WORK(&smc->connect_work, smc_connect_work);
 216         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
 217         INIT_LIST_HEAD(&smc->accept_q);
 218         spin_lock_init(&smc->accept_q_lock);
 219         spin_lock_init(&smc->conn.send_lock);
 220         sk->sk_prot->hash(sk);
 221         sk_refcnt_debug_inc(sk);
 222         mutex_init(&smc->clcsock_release_lock);
 223
 224         return sk;
 225 }
 226
 227 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
 228                     int addr_len)
 229 {
 230         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 231         struct sock *sk = sock->sk;
 232         struct smc_sock *smc;
 233         int rc;
 234
 235         smc = smc_sk(sk);
 236
 237         /* replicate tests from inet_bind(), to be safe wrt. future changes */
 238         rc = -EINVAL;
 239         if (addr_len < sizeof(struct sockaddr_in))
 240                 goto out;
 241
 242         rc = -EAFNOSUPPORT;
 243         if (addr->sin_family != AF_INET &&
 244             addr->sin_family != AF_INET6 &&
 245             addr->sin_family != AF_UNSPEC)
 246                 goto out;
 247         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
 248         if (addr->sin_family == AF_UNSPEC &&
 249             addr->sin_addr.s_addr != htonl(INADDR_ANY))
 250                 goto out;
 251
 252         lock_sock(sk);
 253
 254         /* Check if socket is already active */
 255         rc = -EINVAL;
 256         if (sk->sk_state != SMC_INIT)
 257                 goto out_rel;
 258
 259         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
 260         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
 261
 262 out_rel:
 263         release_sock(sk);
 264 out:
 265         return rc;
 266 }
 267
 268 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
 269                                    unsigned long mask)
 270 {
 271         /* options we don't get control via setsockopt for */
 272         nsk->sk_type = osk->sk_type;
 273         nsk->sk_sndbuf = osk->sk_sndbuf;
 274         nsk->sk_rcvbuf = osk->sk_rcvbuf;
 275         nsk->sk_sndtimeo = osk->sk_sndtimeo;
 276         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
 277         nsk->sk_mark = osk->sk_mark;
 278         nsk->sk_priority = osk->sk_priority;
 279         nsk->sk_rcvlowat = osk->sk_rcvlowat;
 280         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
 281         nsk->sk_err = osk->sk_err;
 282
 283         nsk->sk_flags &= ~mask;
 284         nsk->sk_flags |= osk->sk_flags & mask;
 285 }
 286
 287 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
 288                              (1UL << SOCK_KEEPOPEN) | \
 289                              (1UL << SOCK_LINGER) | \
 290                              (1UL << SOCK_BROADCAST) | \
 291                              (1UL << SOCK_TIMESTAMP) | \
 292                              (1UL << SOCK_DBG) | \
 293                              (1UL << SOCK_RCVTSTAMP) | \
 294                              (1UL << SOCK_RCVTSTAMPNS) | \
 295                              (1UL << SOCK_LOCALROUTE) | \
 296                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
 297                              (1UL << SOCK_RXQ_OVFL) | \
 298                              (1UL << SOCK_WIFI_STATUS) | \
 299                              (1UL << SOCK_NOFCS) | \
 300                              (1UL << SOCK_FILTER_LOCKED) | \
 301                              (1UL << SOCK_TSTAMP_NEW))
 302 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
 303  * clc socket (since smc is not called for these options from net/core)
 304  */
 305 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
 306 {
 307         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
 308 }
 309
 310 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
 311                              (1UL << SOCK_KEEPOPEN) | \
 312                              (1UL << SOCK_LINGER) | \
 313                              (1UL << SOCK_DBG))
 314 /* copy only settings and flags relevant for smc from clc to smc socket */
 315 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
 316 {
 317         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
 318 }
 319
 320 /* register a new rmb, send confirm_rkey msg to register with peer */
 321 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc,
 322                        bool conf_rkey)
 323 {
 324         if (!rmb_desc->wr_reg) {
 325                 /* register memory region for new rmb */
 326                 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
 327                         rmb_desc->regerr = 1;
 328                         return -EFAULT;
 329                 }
 330                 rmb_desc->wr_reg = 1;
 331         }
 332         if (!conf_rkey)
 333                 return 0;
 334         /* exchange confirm_rkey msg with peer */
 335         if (smc_llc_do_confirm_rkey(link, rmb_desc)) {
 336                 rmb_desc->regerr = 1;
 337                 return -EFAULT;
 338         }
 339         return 0;
 340 }
 341
 342 static int smc_clnt_conf_first_link(struct smc_sock *smc)
 343 {
 344         struct net *net = sock_net(smc->clcsock->sk);
 345         struct smc_link_group *lgr = smc->conn.lgr;
 346         struct smc_link *link;
 347         int rest;
 348         int rc;
 349
 350         link = &lgr->lnk[SMC_SINGLE_LINK];
 351         /* receive CONFIRM LINK request from server over RoCE fabric */
 352         rest = wait_for_completion_interruptible_timeout(
 353                 &link->llc_confirm,
 354                 SMC_LLC_WAIT_FIRST_TIME);
 355         if (rest <= 0) {
 356                 struct smc_clc_msg_decline dclc;
 357
 358                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 359                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 360                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
 361         }
 362
 363         if (link->llc_confirm_rc)
 364                 return SMC_CLC_DECL_RMBE_EC;
 365
 366         rc = smc_ib_modify_qp_rts(link);
 367         if (rc)
 368                 return SMC_CLC_DECL_ERR_RDYLNK;
 369
 370         smc_wr_remember_qp_attr(link);
 371
 372         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
 373                 return SMC_CLC_DECL_ERR_REGRMB;
 374
 375         /* send CONFIRM LINK response over RoCE fabric */
 376         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
 377         if (rc < 0)
 378                 return SMC_CLC_DECL_TIMEOUT_CL;
 379
 380         /* receive ADD LINK request from server over RoCE fabric */
 381         rest = wait_for_completion_interruptible_timeout(&link->llc_add,
 382                                                          SMC_LLC_WAIT_TIME);
 383         if (rest <= 0) {
 384                 struct smc_clc_msg_decline dclc;
 385
 386                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 387                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 388                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
 389         }
 390
 391         /* send add link reject message, only one link supported for now */
 392         rc = smc_llc_send_add_link(link,
 393                                    link->smcibdev->mac[link->ibport - 1],
 394                                    link->gid, SMC_LLC_RESP);
 395         if (rc < 0)
 396                 return SMC_CLC_DECL_TIMEOUT_AL;
 397
 398         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
 399
 400         return 0;
 401 }
 402
 403 static void smcr_conn_save_peer_info(struct smc_sock *smc,
 404                                      struct smc_clc_msg_accept_confirm *clc)
 405 {
 406         int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
 407
 408         smc->conn.peer_rmbe_idx = clc->rmbe_idx;
 409         smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
 410         smc->conn.peer_rmbe_size = bufsize;
 411         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 412         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
 413 }
 414
 415 static void smcd_conn_save_peer_info(struct smc_sock *smc,
 416                                      struct smc_clc_msg_accept_confirm *clc)
 417 {
 418         int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
 419
 420         smc->conn.peer_rmbe_idx = clc->dmbe_idx;
 421         smc->conn.peer_token = clc->token;
 422         /* msg header takes up space in the buffer */
 423         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
 424         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 425         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
 426 }
 427
 428 static void smc_conn_save_peer_info(struct smc_sock *smc,
 429                                     struct smc_clc_msg_accept_confirm *clc)
 430 {
 431         if (smc->conn.lgr->is_smcd)
 432                 smcd_conn_save_peer_info(smc, clc);
 433         else
 434                 smcr_conn_save_peer_info(smc, clc);
 435 }
 436
 437 static void smc_link_save_peer_info(struct smc_link *link,
 438                                     struct smc_clc_msg_accept_confirm *clc)
 439 {
 440         link->peer_qpn = ntoh24(clc->qpn);
 441         memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
 442         memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
 443         link->peer_psn = ntoh24(clc->psn);
 444         link->peer_mtu = clc->qp_mtu;
 445 }
 446
 447 /* fall back during connect */
 448 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 449 {
 450         smc->use_fallback = true;
 451         smc->fallback_rsn = reason_code;
 452         smc_copy_sock_settings_to_clc(smc);
 453         smc->connect_nonblock = 0;
 454         if (smc->sk.sk_state == SMC_INIT)
 455                 smc->sk.sk_state = SMC_ACTIVE;
 456         return 0;
 457 }
 458
 459 /* decline and fall back during connect */
 460 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
 461 {
 462         int rc;
 463
 464         if (reason_code < 0) { /* error, fallback is not possible */
 465                 if (smc->sk.sk_state == SMC_INIT)
 466                         sock_put(&smc->sk); /* passive closing */
 467                 return reason_code;
 468         }
 469         if (reason_code != SMC_CLC_DECL_PEERDECL) {
 470                 rc = smc_clc_send_decline(smc, reason_code);
 471                 if (rc < 0) {
 472                         if (smc->sk.sk_state == SMC_INIT)
 473                                 sock_put(&smc->sk); /* passive closing */
 474                         return rc;
 475                 }
 476         }
 477         return smc_connect_fallback(smc, reason_code);
 478 }
 479
 480 /* abort connecting */
 481 static int smc_connect_abort(struct smc_sock *smc, int reason_code,
 482                              int local_contact)
 483 {
 484         if (local_contact == SMC_FIRST_CONTACT)
 485                 smc_lgr_forget(smc->conn.lgr);
 486         if (smc->conn.lgr->is_smcd)
 487                 /* there is only one lgr role for SMC-D; use server lock */
 488                 mutex_unlock(&smc_server_lgr_pending);
 489         else
 490                 mutex_unlock(&smc_client_lgr_pending);
 491
 492         smc_conn_free(&smc->conn);
 493         smc->connect_nonblock = 0;
 494         return reason_code;
 495 }
 496
 497 /* check if there is a rdma device available for this connection. */
 498 /* called for connect and listen */
 499 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
 500 {
 501         /* PNET table look up: search active ib_device and port
 502          * within same PNETID that also contains the ethernet device
 503          * used for the internal TCP socket
 504          */
 505         smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
 506         if (!ini->ib_dev)
 507                 return SMC_CLC_DECL_NOSMCRDEV;
 508         return 0;
 509 }
 510
 511 /* check if there is an ISM device available for this connection. */
 512 /* called for connect and listen */
 513 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
 514 {
 515         /* Find ISM device with same PNETID as connecting interface  */
 516         smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
 517         if (!ini->ism_dev)
 518                 return SMC_CLC_DECL_NOSMCDDEV;
 519         return 0;
 520 }
 521
 522 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
 523 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
 524                                       struct smc_init_info *ini)
 525 {
 526         if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev, ini->vlan_id))
 527                 return SMC_CLC_DECL_ISMVLANERR;
 528         return 0;
 529 }
 530
 531 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
 532  * used, the VLAN ID will be registered again during the connection setup.
 533  */
 534 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
 535                                         struct smc_init_info *ini)
 536 {
 537         if (!is_smcd)
 538                 return 0;
 539         if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev, ini->vlan_id))
 540                 return SMC_CLC_DECL_CNFERR;
 541         return 0;
 542 }
 543
 544 /* CLC handshake during connect */
 545 static int smc_connect_clc(struct smc_sock *smc, int smc_type,
 546                            struct smc_clc_msg_accept_confirm *aclc,
 547                            struct smc_init_info *ini)
 548 {
 549         int rc = 0;
 550
 551         /* do inband token exchange */
 552         rc = smc_clc_send_proposal(smc, smc_type, ini);
 553         if (rc)
 554                 return rc;
 555         /* receive SMC Accept CLC message */
 556         return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT,
 557                                 CLC_WAIT_TIME);
 558 }
 559
 560 /* setup for RDMA connection of client */
 561 static int smc_connect_rdma(struct smc_sock *smc,
 562                             struct smc_clc_msg_accept_confirm *aclc,
 563                             struct smc_init_info *ini)
 564 {
 565         struct smc_link *link;
 566         int reason_code = 0;
 567
 568         ini->is_smcd = false;
 569         ini->ib_lcl = &aclc->lcl;
 570         ini->ib_clcqpn = ntoh24(aclc->qpn);
 571         ini->srv_first_contact = aclc->hdr.flag;
 572
 573         mutex_lock(&smc_client_lgr_pending);
 574         reason_code = smc_conn_create(smc, ini);
 575         if (reason_code) {
 576                 mutex_unlock(&smc_client_lgr_pending);
 577                 return reason_code;
 578         }
 579         link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
 580
 581         smc_conn_save_peer_info(smc, aclc);
 582
 583         /* create send buffer and rmb */
 584         if (smc_buf_create(smc, false))
 585                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM,
 586                                          ini->cln_first_contact);
 587
 588         if (ini->cln_first_contact == SMC_FIRST_CONTACT)
 589                 smc_link_save_peer_info(link, aclc);
 590
 591         if (smc_rmb_rtoken_handling(&smc->conn, aclc))
 592                 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
 593                                          ini->cln_first_contact);
 594
 595         smc_close_init(smc);
 596         smc_rx_init(smc);
 597
 598         if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
 599                 if (smc_ib_ready_link(link))
 600                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
 601                                                  ini->cln_first_contact);
 602         } else {
 603                 if (smc_reg_rmb(link, smc->conn.rmb_desc, true))
 604                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
 605                                                  ini->cln_first_contact);
 606         }
 607         smc_rmb_sync_sg_for_device(&smc->conn);
 608
 609         reason_code = smc_clc_send_confirm(smc);
 610         if (reason_code)
 611                 return smc_connect_abort(smc, reason_code,
 612                                          ini->cln_first_contact);
 613
 614         smc_tx_init(smc);
 615
 616         if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
 617                 /* QP confirmation over RoCE fabric */
 618                 reason_code = smc_clnt_conf_first_link(smc);
 619                 if (reason_code)
 620                         return smc_connect_abort(smc, reason_code,
 621                                                  ini->cln_first_contact);
 622         }
 623         mutex_unlock(&smc_client_lgr_pending);
 624
 625         smc_copy_sock_settings_to_clc(smc);
 626         smc->connect_nonblock = 0;
 627         if (smc->sk.sk_state == SMC_INIT)
 628                 smc->sk.sk_state = SMC_ACTIVE;
 629
 630         return 0;
 631 }
 632
 633 /* setup for ISM connection of client */
 634 static int smc_connect_ism(struct smc_sock *smc,
 635                            struct smc_clc_msg_accept_confirm *aclc,
 636                            struct smc_init_info *ini)
 637 {
 638         int rc = 0;
 639
 640         ini->is_smcd = true;
 641         ini->ism_gid = aclc->gid;
 642         ini->srv_first_contact = aclc->hdr.flag;
 643
 644         /* there is only one lgr role for SMC-D; use server lock */
 645         mutex_lock(&smc_server_lgr_pending);
 646         rc = smc_conn_create(smc, ini);
 647         if (rc) {
 648                 mutex_unlock(&smc_server_lgr_pending);
 649                 return rc;
 650         }
 651
 652         /* Create send and receive buffers */
 653         if (smc_buf_create(smc, true))
 654                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM,
 655                                          ini->cln_first_contact);
 656
 657         smc_conn_save_peer_info(smc, aclc);
 658         smc_close_init(smc);
 659         smc_rx_init(smc);
 660         smc_tx_init(smc);
 661
 662         rc = smc_clc_send_confirm(smc);
 663         if (rc)
 664                 return smc_connect_abort(smc, rc, ini->cln_first_contact);
 665         mutex_unlock(&smc_server_lgr_pending);
 666
 667         smc_copy_sock_settings_to_clc(smc);
 668         smc->connect_nonblock = 0;
 669         if (smc->sk.sk_state == SMC_INIT)
 670                 smc->sk.sk_state = SMC_ACTIVE;
 671
 672         return 0;
 673 }
 674
 675 /* perform steps before actually connecting */
 676 static int __smc_connect(struct smc_sock *smc)
 677 {
 678         bool ism_supported = false, rdma_supported = false;
 679         struct smc_clc_msg_accept_confirm aclc;
 680         struct smc_init_info ini = {0};
 681         int smc_type;
 682         int rc = 0;
 683
 684         sock_hold(&smc->sk); /* sock put in passive closing */
 685
 686         if (smc->use_fallback)
 687                 return smc_connect_fallback(smc, smc->fallback_rsn);
 688
 689         /* if peer has not signalled SMC-capability, fall back */
 690         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
 691                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
 692
 693         /* IPSec connections opt out of SMC-R optimizations */
 694         if (using_ipsec(smc))
 695                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
 696
 697         /* get vlan id from IP device */
 698         if (smc_vlan_by_tcpsk(smc->clcsock, &ini))
 699                 return smc_connect_decline_fallback(smc,
 700                                                     SMC_CLC_DECL_GETVLANERR);
 701
 702         /* check if there is an ism device available */
 703         if (!smc_find_ism_device(smc, &ini) &&
 704             !smc_connect_ism_vlan_setup(smc, &ini)) {
 705                 /* ISM is supported for this connection */
 706                 ism_supported = true;
 707                 smc_type = SMC_TYPE_D;
 708         }
 709
 710         /* check if there is a rdma device available */
 711         if (!smc_find_rdma_device(smc, &ini)) {
 712                 /* RDMA is supported for this connection */
 713                 rdma_supported = true;
 714                 if (ism_supported)
 715                         smc_type = SMC_TYPE_B; /* both */
 716                 else
 717                         smc_type = SMC_TYPE_R; /* only RDMA */
 718         }
 719
 720         /* if neither ISM nor RDMA are supported, fallback */
 721         if (!rdma_supported && !ism_supported)
 722                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
 723
 724         /* perform CLC handshake */
 725         rc = smc_connect_clc(smc, smc_type, &aclc, &ini);
 726         if (rc) {
 727                 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
 728                 return smc_connect_decline_fallback(smc, rc);
 729         }
 730
 731         /* depending on previous steps, connect using rdma or ism */
 732         if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
 733                 rc = smc_connect_rdma(smc, &aclc, &ini);
 734         else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
 735                 rc = smc_connect_ism(smc, &aclc, &ini);
 736         else
 737                 rc = SMC_CLC_DECL_MODEUNSUPP;
 738         if (rc) {
 739                 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
 740                 return smc_connect_decline_fallback(smc, rc);
 741         }
 742
 743         smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
 744         return 0;
 745 }
 746
 747 static void smc_connect_work(struct work_struct *work)
 748 {
 749         struct smc_sock *smc = container_of(work, struct smc_sock,
 750                                             connect_work);
 751         long timeo = smc->sk.sk_sndtimeo;
 752         int rc = 0;
 753
 754         if (!timeo)
 755                 timeo = MAX_SCHEDULE_TIMEOUT;
 756         lock_sock(smc->clcsock->sk);
 757         if (smc->clcsock->sk->sk_err) {
 758                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
 759         } else if ((1 << smc->clcsock->sk->sk_state) &
 760                                         (TCPF_SYN_SENT | TCP_SYN_RECV)) {
 761                 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
 762                 if ((rc == -EPIPE) &&
 763                     ((1 << smc->clcsock->sk->sk_state) &
 764                                         (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
 765                         rc = 0;
 766         }
 767         release_sock(smc->clcsock->sk);
 768         lock_sock(&smc->sk);
 769         if (rc != 0 || smc->sk.sk_err) {
 770                 smc->sk.sk_state = SMC_CLOSED;
 771                 if (rc == -EPIPE || rc == -EAGAIN)
 772                         smc->sk.sk_err = EPIPE;
 773                 else if (signal_pending(current))
 774                         smc->sk.sk_err = -sock_intr_errno(timeo);
 775                 goto out;
 776         }
 777
 778         rc = __smc_connect(smc);
 779         if (rc < 0)
 780                 smc->sk.sk_err = -rc;
 781
 782 out:
 783         if (smc->sk.sk_err)
 784                 smc->sk.sk_state_change(&smc->sk);
 785         else
 786                 smc->sk.sk_write_space(&smc->sk);
 787         release_sock(&smc->sk);
 788 }
 789
 790 static int smc_connect(struct socket *sock, struct sockaddr *addr,
 791                        int alen, int flags)
 792 {
 793         struct sock *sk = sock->sk;
 794         struct smc_sock *smc;
 795         int rc = -EINVAL;
 796
 797         smc = smc_sk(sk);
 798
 799         /* separate smc parameter checking to be safe */
 800         if (alen < sizeof(addr->sa_family))
 801                 goto out_err;
 802         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
 803                 goto out_err;
 804
 805         lock_sock(sk);
 806         switch (sk->sk_state) {
 807         default:
 808                 goto out;
 809         case SMC_ACTIVE:
 810                 rc = -EISCONN;
 811                 goto out;
 812         case SMC_INIT:
 813                 rc = 0;
 814                 break;
 815         }
 816
 817         smc_copy_sock_settings_to_clc(smc);
 818         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
 819         if (smc->connect_nonblock) {
 820                 rc = -EALREADY;
 821                 goto out;
 822         }
 823         rc = kernel_connect(smc->clcsock, addr, alen, flags);
 824         if (rc && rc != -EINPROGRESS)
 825                 goto out;
 826         if (flags & O_NONBLOCK) {
 827                 if (schedule_work(&smc->connect_work))
 828                         smc->connect_nonblock = 1;
 829                 rc = -EINPROGRESS;
 830         } else {
 831                 rc = __smc_connect(smc);
 832                 if (rc < 0)
 833                         goto out;
 834                 else
 835                         rc = 0; /* success cases including fallback */
 836         }
 837
 838 out:
 839         release_sock(sk);
 840 out_err:
 841         return rc;
 842 }
 843
 844 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
 845 {
 846         struct socket *new_clcsock = NULL;
 847         struct sock *lsk = &lsmc->sk;
 848         struct sock *new_sk;
 849         int rc = -EINVAL;
 850
 851         release_sock(lsk);
 852         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
 853         if (!new_sk) {
 854                 rc = -ENOMEM;
 855                 lsk->sk_err = ENOMEM;
 856                 *new_smc = NULL;
 857                 lock_sock(lsk);
 858                 goto out;
 859         }
 860         *new_smc = smc_sk(new_sk);
 861
 862         mutex_lock(&lsmc->clcsock_release_lock);
 863         if (lsmc->clcsock)
 864                 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
 865         mutex_unlock(&lsmc->clcsock_release_lock);
 866         lock_sock(lsk);
 867         if  (rc < 0)
 868                 lsk->sk_err = -rc;
 869         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
 870                 if (new_clcsock)
 871                         sock_release(new_clcsock);
 872                 new_sk->sk_state = SMC_CLOSED;
 873                 sock_set_flag(new_sk, SOCK_DEAD);
 874                 new_sk->sk_prot->unhash(new_sk);
 875                 sock_put(new_sk); /* final */
 876                 *new_smc = NULL;
 877                 goto out;
 878         }
 879
 880         (*new_smc)->clcsock = new_clcsock;
 881 out:
 882         return rc;
 883 }
 884
 885 /* add a just created sock to the accept queue of the listen sock as
 886  * candidate for a following socket accept call from user space
 887  */
 888 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
 889 {
 890         struct smc_sock *par = smc_sk(parent);
 891
 892         sock_hold(sk); /* sock_put in smc_accept_unlink () */
 893         spin_lock(&par->accept_q_lock);
 894         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
 895         spin_unlock(&par->accept_q_lock);
 896         sk_acceptq_added(parent);
 897 }
 898
 899 /* remove a socket from the accept queue of its parental listening socket */
 900 static void smc_accept_unlink(struct sock *sk)
 901 {
 902         struct smc_sock *par = smc_sk(sk)->listen_smc;
 903
 904         spin_lock(&par->accept_q_lock);
 905         list_del_init(&smc_sk(sk)->accept_q);
 906         spin_unlock(&par->accept_q_lock);
 907         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
 908         sock_put(sk); /* sock_hold in smc_accept_enqueue */
 909 }
 910
 911 /* remove a sock from the accept queue to bind it to a new socket created
 912  * for a socket accept call from user space
 913  */
 914 struct sock *smc_accept_dequeue(struct sock *parent,
 915                                 struct socket *new_sock)
 916 {
 917         struct smc_sock *isk, *n;
 918         struct sock *new_sk;
 919
 920         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
 921                 new_sk = (struct sock *)isk;
 922
 923                 smc_accept_unlink(new_sk);
 924                 if (new_sk->sk_state == SMC_CLOSED) {
 925                         if (isk->clcsock) {
 926                                 sock_release(isk->clcsock);
 927                                 isk->clcsock = NULL;
 928                         }
 929                         new_sk->sk_prot->unhash(new_sk);
 930                         sock_put(new_sk); /* final */
 931                         continue;
 932                 }
 933                 if (new_sock)
 934                         sock_graft(new_sk, new_sock);
 935                 return new_sk;
 936         }
 937         return NULL;
 938 }
 939
 940 /* clean up for a created but never accepted sock */
 941 void smc_close_non_accepted(struct sock *sk)
 942 {
 943         struct smc_sock *smc = smc_sk(sk);
 944
 945         lock_sock(sk);
 946         if (!sk->sk_lingertime)
 947                 /* wait for peer closing */
 948                 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
 949         if (!smc->use_fallback) {
 950                 smc_close_active(smc);
 951                 sock_set_flag(sk, SOCK_DEAD);
 952                 sk->sk_shutdown |= SHUTDOWN_MASK;
 953         }
 954         if (smc->clcsock) {
 955                 struct socket *tcp;
 956
 957                 tcp = smc->clcsock;
 958                 smc->clcsock = NULL;
 959                 sock_release(tcp);
 960         }
 961         if (smc->use_fallback) {
 962                 sock_put(sk); /* passive closing */
 963                 sk->sk_state = SMC_CLOSED;
 964         } else {
 965                 if (sk->sk_state == SMC_CLOSED)
 966                         smc_conn_free(&smc->conn);
 967         }
 968         release_sock(sk);
 969         sk->sk_prot->unhash(sk);
 970         sock_put(sk); /* final sock_put */
 971 }
 972
 973 static int smc_serv_conf_first_link(struct smc_sock *smc)
 974 {
 975         struct net *net = sock_net(smc->clcsock->sk);
 976         struct smc_link_group *lgr = smc->conn.lgr;
 977         struct smc_link *link;
 978         int rest;
 979         int rc;
 980
 981         link = &lgr->lnk[SMC_SINGLE_LINK];
 982
 983         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
 984                 return SMC_CLC_DECL_ERR_REGRMB;
 985
 986         /* send CONFIRM LINK request to client over the RoCE fabric */
 987         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
 988         if (rc < 0)
 989                 return SMC_CLC_DECL_TIMEOUT_CL;
 990
 991         /* receive CONFIRM LINK response from client over the RoCE fabric */
 992         rest = wait_for_completion_interruptible_timeout(
 993                 &link->llc_confirm_resp,
 994                 SMC_LLC_WAIT_FIRST_TIME);
 995         if (rest <= 0) {
 996                 struct smc_clc_msg_decline dclc;
 997
 998                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 999                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1000                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1001         }
1002
1003         if (link->llc_confirm_resp_rc)
1004                 return SMC_CLC_DECL_RMBE_EC;
1005
1006         /* send ADD LINK request to client over the RoCE fabric */
1007         rc = smc_llc_send_add_link(link,
1008                                    link->smcibdev->mac[link->ibport - 1],
1009                                    link->gid, SMC_LLC_REQ);
1010         if (rc < 0)
1011                 return SMC_CLC_DECL_TIMEOUT_AL;
1012
1013         /* receive ADD LINK response from client over the RoCE fabric */
1014         rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
1015                                                          SMC_LLC_WAIT_TIME);
1016         if (rest <= 0) {
1017                 struct smc_clc_msg_decline dclc;
1018
1019                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1020                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1021                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
1022         }
1023
1024         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
1025
1026         return 0;
1027 }
1028
1029 /* listen worker: finish */
1030 static void smc_listen_out(struct smc_sock *new_smc)
1031 {
1032         struct smc_sock *lsmc = new_smc->listen_smc;
1033         struct sock *newsmcsk = &new_smc->sk;
1034
1035         lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1036         if (lsmc->sk.sk_state == SMC_LISTEN) {
1037                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1038         } else { /* no longer listening */
1039                 smc_close_non_accepted(newsmcsk);
1040         }
1041         release_sock(&lsmc->sk);
1042
1043         /* Wake up accept */
1044         lsmc->sk.sk_data_ready(&lsmc->sk);
1045         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1046 }
1047
1048 /* listen worker: finish in state connected */
1049 static void smc_listen_out_connected(struct smc_sock *new_smc)
1050 {
1051         struct sock *newsmcsk = &new_smc->sk;
1052
1053         sk_refcnt_debug_inc(newsmcsk);
1054         if (newsmcsk->sk_state == SMC_INIT)
1055                 newsmcsk->sk_state = SMC_ACTIVE;
1056
1057         smc_listen_out(new_smc);
1058 }
1059
1060 /* listen worker: finish in error state */
1061 static void smc_listen_out_err(struct smc_sock *new_smc)
1062 {
1063         struct sock *newsmcsk = &new_smc->sk;
1064
1065         if (newsmcsk->sk_state == SMC_INIT)
1066                 sock_put(&new_smc->sk); /* passive closing */
1067         newsmcsk->sk_state = SMC_CLOSED;
1068         smc_conn_free(&new_smc->conn);
1069
1070         smc_listen_out(new_smc);
1071 }
1072
1073 /* listen worker: decline and fall back if possible */
1074 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1075                                int local_contact)
1076 {
1077         /* RDMA setup failed, switch back to TCP */
1078         if (local_contact == SMC_FIRST_CONTACT)
1079                 smc_lgr_forget(new_smc->conn.lgr);
1080         if (reason_code < 0) { /* error, no fallback possible */
1081                 smc_listen_out_err(new_smc);
1082                 return;
1083         }
1084         smc_conn_free(&new_smc->conn);
1085         new_smc->use_fallback = true;
1086         new_smc->fallback_rsn = reason_code;
1087         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1088                 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1089                         smc_listen_out_err(new_smc);
1090                         return;
1091                 }
1092         }
1093         smc_listen_out_connected(new_smc);
1094 }
1095
1096 /* listen worker: check prefixes */
1097 static int smc_listen_prfx_check(struct smc_sock *new_smc,
1098                                  struct smc_clc_msg_proposal *pclc)
1099 {
1100         struct smc_clc_msg_proposal_prefix *pclc_prfx;
1101         struct socket *newclcsock = new_smc->clcsock;
1102
1103         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1104         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1105                 return SMC_CLC_DECL_DIFFPREFIX;
1106
1107         return 0;
1108 }
1109
1110 /* listen worker: initialize connection and buffers */
1111 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1112                                 struct smc_init_info *ini)
1113 {
1114         int rc;
1115
1116         /* allocate connection / link group */
1117         rc = smc_conn_create(new_smc, ini);
1118         if (rc)
1119                 return rc;
1120
1121         /* create send buffer and rmb */
1122         if (smc_buf_create(new_smc, false))
1123                 return SMC_CLC_DECL_MEM;
1124
1125         return 0;
1126 }
1127
1128 /* listen worker: initialize connection and buffers for SMC-D */
1129 static int smc_listen_ism_init(struct smc_sock *new_smc,
1130                                struct smc_clc_msg_proposal *pclc,
1131                                struct smc_init_info *ini)
1132 {
1133         struct smc_clc_msg_smcd *pclc_smcd;
1134         int rc;
1135
1136         pclc_smcd = smc_get_clc_msg_smcd(pclc);
1137         ini->ism_gid = pclc_smcd->gid;
1138         rc = smc_conn_create(new_smc, ini);
1139         if (rc)
1140                 return rc;
1141
1142         /* Check if peer can be reached via ISM device */
1143         if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1144                             new_smc->conn.lgr->vlan_id,
1145                             new_smc->conn.lgr->smcd)) {
1146                 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1147                         smc_lgr_forget(new_smc->conn.lgr);
1148                 smc_conn_free(&new_smc->conn);
1149                 return SMC_CLC_DECL_SMCDNOTALK;
1150         }
1151
1152         /* Create send and receive buffers */
1153         if (smc_buf_create(new_smc, true)) {
1154                 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1155                         smc_lgr_forget(new_smc->conn.lgr);
1156                 smc_conn_free(&new_smc->conn);
1157                 return SMC_CLC_DECL_MEM;
1158         }
1159
1160         return 0;
1161 }
1162
1163 /* listen worker: register buffers */
1164 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1165 {
1166         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1167
1168         if (local_contact != SMC_FIRST_CONTACT) {
1169                 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
1170                         return SMC_CLC_DECL_ERR_REGRMB;
1171         }
1172         smc_rmb_sync_sg_for_device(&new_smc->conn);
1173
1174         return 0;
1175 }
1176
1177 /* listen worker: finish RDMA setup */
1178 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1179                                   struct smc_clc_msg_accept_confirm *cclc,
1180                                   int local_contact)
1181 {
1182         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1183         int reason_code = 0;
1184
1185         if (local_contact == SMC_FIRST_CONTACT)
1186                 smc_link_save_peer_info(link, cclc);
1187
1188         if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
1189                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1190                 goto decline;
1191         }
1192
1193         if (local_contact == SMC_FIRST_CONTACT) {
1194                 if (smc_ib_ready_link(link)) {
1195                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1196                         goto decline;
1197                 }
1198                 /* QP confirmation over RoCE fabric */
1199                 reason_code = smc_serv_conf_first_link(new_smc);
1200                 if (reason_code)
1201                         goto decline;
1202         }
1203         return 0;
1204
1205 decline:
1206         smc_listen_decline(new_smc, reason_code, local_contact);
1207         return reason_code;
1208 }
1209
1210 /* setup for RDMA connection of server */
1211 static void smc_listen_work(struct work_struct *work)
1212 {
1213         struct smc_sock *new_smc = container_of(work, struct smc_sock,
1214                                                 smc_listen_work);
1215         struct socket *newclcsock = new_smc->clcsock;
1216         struct smc_clc_msg_accept_confirm cclc;
1217         struct smc_clc_msg_proposal *pclc;
1218         struct smc_init_info ini = {0};
1219         bool ism_supported = false;
1220         u8 buf[SMC_CLC_MAX_LEN];
1221         int rc = 0;
1222
1223         if (new_smc->use_fallback) {
1224                 smc_listen_out_connected(new_smc);
1225                 return;
1226         }
1227
1228         /* check if peer is smc capable */
1229         if (!tcp_sk(newclcsock->sk)->syn_smc) {
1230                 new_smc->use_fallback = true;
1231                 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1232                 smc_listen_out_connected(new_smc);
1233                 return;
1234         }
1235
1236         /* do inband token exchange -
1237          * wait for and receive SMC Proposal CLC message
1238          */
1239         pclc = (struct smc_clc_msg_proposal *)&buf;
1240         rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1241                               SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1242         if (rc)
1243                 goto out_decl;
1244
1245         /* IPSec connections opt out of SMC-R optimizations */
1246         if (using_ipsec(new_smc)) {
1247                 rc = SMC_CLC_DECL_IPSEC;
1248                 goto out_decl;
1249         }
1250
1251         /* check for matching IP prefix and subnet length */
1252         rc = smc_listen_prfx_check(new_smc, pclc);
1253         if (rc)
1254                 goto out_decl;
1255
1256         /* get vlan id from IP device */
1257         if (smc_vlan_by_tcpsk(new_smc->clcsock, &ini)) {
1258                 rc = SMC_CLC_DECL_GETVLANERR;
1259                 goto out_decl;
1260         }
1261
1262         mutex_lock(&smc_server_lgr_pending);
1263         smc_close_init(new_smc);
1264         smc_rx_init(new_smc);
1265         smc_tx_init(new_smc);
1266
1267         /* check if ISM is available */
1268         if (pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) {
1269                 ini.is_smcd = true; /* prepare ISM check */
1270                 rc = smc_find_ism_device(new_smc, &ini);
1271                 if (!rc)
1272                         rc = smc_listen_ism_init(new_smc, pclc, &ini);
1273                 if (!rc)
1274                         ism_supported = true;
1275                 else if (pclc->hdr.path == SMC_TYPE_D)
1276                         goto out_unlock; /* skip RDMA and decline */
1277         }
1278
1279         /* check if RDMA is available */
1280         if (!ism_supported) { /* SMC_TYPE_R or SMC_TYPE_B */
1281                 /* prepare RDMA check */
1282                 memset(&ini, 0, sizeof(ini));
1283                 ini.is_smcd = false;
1284                 ini.ib_lcl = &pclc->lcl;
1285                 rc = smc_find_rdma_device(new_smc, &ini);
1286                 if (rc) {
1287                         /* no RDMA device found */
1288                         if (pclc->hdr.path == SMC_TYPE_B)
1289                                 /* neither ISM nor RDMA device found */
1290                                 rc = SMC_CLC_DECL_NOSMCDEV;
1291                         goto out_unlock;
1292                 }
1293                 rc = smc_listen_rdma_init(new_smc, &ini);
1294                 if (rc)
1295                         goto out_unlock;
1296                 rc = smc_listen_rdma_reg(new_smc, ini.cln_first_contact);
1297                 if (rc)
1298                         goto out_unlock;
1299         }
1300
1301         /* send SMC Accept CLC message */
1302         rc = smc_clc_send_accept(new_smc, ini.cln_first_contact);
1303         if (rc)
1304                 goto out_unlock;
1305
1306         /* SMC-D does not need this lock any more */
1307         if (ism_supported)
1308                 mutex_unlock(&smc_server_lgr_pending);
1309
1310         /* receive SMC Confirm CLC message */
1311         rc = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1312                               SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1313         if (rc) {
1314                 if (!ism_supported)
1315                         goto out_unlock;
1316                 goto out_decl;
1317         }
1318
1319         /* finish worker */
1320         if (!ism_supported) {
1321                 rc = smc_listen_rdma_finish(new_smc, &cclc,
1322                                             ini.cln_first_contact);
1323                 mutex_unlock(&smc_server_lgr_pending);
1324                 if (rc)
1325                         return;
1326         }
1327         smc_conn_save_peer_info(new_smc, &cclc);
1328         smc_listen_out_connected(new_smc);
1329         return;
1330
1331 out_unlock:
1332         mutex_unlock(&smc_server_lgr_pending);
1333 out_decl:
1334         smc_listen_decline(new_smc, rc, ini.cln_first_contact);
1335 }
1336
1337 static void smc_tcp_listen_work(struct work_struct *work)
1338 {
1339         struct smc_sock *lsmc = container_of(work, struct smc_sock,
1340                                              tcp_listen_work);
1341         struct sock *lsk = &lsmc->sk;
1342         struct smc_sock *new_smc;
1343         int rc = 0;
1344
1345         lock_sock(lsk);
1346         while (lsk->sk_state == SMC_LISTEN) {
1347                 rc = smc_clcsock_accept(lsmc, &new_smc);
1348                 if (rc)
1349                         goto out;
1350                 if (!new_smc)
1351                         continue;
1352
1353                 new_smc->listen_smc = lsmc;
1354                 new_smc->use_fallback = lsmc->use_fallback;
1355                 new_smc->fallback_rsn = lsmc->fallback_rsn;
1356                 sock_hold(lsk); /* sock_put in smc_listen_work */
1357                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1358                 smc_copy_sock_settings_to_smc(new_smc);
1359                 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1360                 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1361                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1362                 if (!schedule_work(&new_smc->smc_listen_work))
1363                         sock_put(&new_smc->sk);
1364         }
1365
1366 out:
1367         release_sock(lsk);
1368         sock_put(&lsmc->sk); /* sock_hold in smc_listen */
1369 }
1370
1371 static int smc_listen(struct socket *sock, int backlog)
1372 {
1373         struct sock *sk = sock->sk;
1374         struct smc_sock *smc;
1375         int rc;
1376
1377         smc = smc_sk(sk);
1378         lock_sock(sk);
1379
1380         rc = -EINVAL;
1381         if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
1382                 goto out;
1383
1384         rc = 0;
1385         if (sk->sk_state == SMC_LISTEN) {
1386                 sk->sk_max_ack_backlog = backlog;
1387                 goto out;
1388         }
1389         /* some socket options are handled in core, so we could not apply
1390          * them to the clc socket -- copy smc socket options to clc socket
1391          */
1392         smc_copy_sock_settings_to_clc(smc);
1393         if (!smc->use_fallback)
1394                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1395
1396         rc = kernel_listen(smc->clcsock, backlog);
1397         if (rc)
1398                 goto out;
1399         sk->sk_max_ack_backlog = backlog;
1400         sk->sk_ack_backlog = 0;
1401         sk->sk_state = SMC_LISTEN;
1402         sock_hold(sk); /* sock_hold in tcp_listen_worker */
1403         if (!schedule_work(&smc->tcp_listen_work))
1404                 sock_put(sk);
1405
1406 out:
1407         release_sock(sk);
1408         return rc;
1409 }
1410
1411 static int smc_accept(struct socket *sock, struct socket *new_sock,
1412                       int flags, bool kern)
1413 {
1414         struct sock *sk = sock->sk, *nsk;
1415         DECLARE_WAITQUEUE(wait, current);
1416         struct smc_sock *lsmc;
1417         long timeo;
1418         int rc = 0;
1419
1420         lsmc = smc_sk(sk);
1421         sock_hold(sk); /* sock_put below */
1422         lock_sock(sk);
1423
1424         if (lsmc->sk.sk_state != SMC_LISTEN) {
1425                 rc = -EINVAL;
1426                 release_sock(sk);
1427                 goto out;
1428         }
1429
1430         /* Wait for an incoming connection */
1431         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1432         add_wait_queue_exclusive(sk_sleep(sk), &wait);
1433         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1434                 set_current_state(TASK_INTERRUPTIBLE);
1435                 if (!timeo) {
1436                         rc = -EAGAIN;
1437                         break;
1438                 }
1439                 release_sock(sk);
1440                 timeo = schedule_timeout(timeo);
1441                 /* wakeup by sk_data_ready in smc_listen_work() */
1442                 sched_annotate_sleep();
1443                 lock_sock(sk);
1444                 if (signal_pending(current)) {
1445                         rc = sock_intr_errno(timeo);
1446                         break;
1447                 }
1448         }
1449         set_current_state(TASK_RUNNING);
1450         remove_wait_queue(sk_sleep(sk), &wait);
1451
1452         if (!rc)
1453                 rc = sock_error(nsk);
1454         release_sock(sk);
1455         if (rc)
1456                 goto out;
1457
1458         if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1459                 /* wait till data arrives on the socket */
1460                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1461                                                                 MSEC_PER_SEC);
1462                 if (smc_sk(nsk)->use_fallback) {
1463                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1464
1465                         lock_sock(clcsk);
1466                         if (skb_queue_empty(&clcsk->sk_receive_queue))
1467                                 sk_wait_data(clcsk, &timeo, NULL);
1468                         release_sock(clcsk);
1469                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1470                         lock_sock(nsk);
1471                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1472                         release_sock(nsk);
1473                 }
1474         }
1475
1476 out:
1477         sock_put(sk); /* sock_hold above */
1478         return rc;
1479 }
1480
1481 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1482                        int peer)
1483 {
1484         struct smc_sock *smc;
1485
1486         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1487             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1488                 return -ENOTCONN;
1489
1490         smc = smc_sk(sock->sk);
1491
1492         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1493 }
1494
1495 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1496 {
1497         struct sock *sk = sock->sk;
1498         struct smc_sock *smc;
1499         int rc = -EPIPE;
1500
1501         smc = smc_sk(sk);
1502         lock_sock(sk);
1503         if ((sk->sk_state != SMC_ACTIVE) &&
1504             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1505             (sk->sk_state != SMC_INIT))
1506                 goto out;
1507
1508         if (msg->msg_flags & MSG_FASTOPEN) {
1509                 if (sk->sk_state == SMC_INIT) {
1510                         smc->use_fallback = true;
1511                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1512                 } else {
1513                         rc = -EINVAL;
1514                         goto out;
1515                 }
1516         }
1517
1518         if (smc->use_fallback)
1519                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1520         else
1521                 rc = smc_tx_sendmsg(smc, msg, len);
1522 out:
1523         release_sock(sk);
1524         return rc;
1525 }
1526
1527 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1528                        int flags)
1529 {
1530         struct sock *sk = sock->sk;
1531         struct smc_sock *smc;
1532         int rc = -ENOTCONN;
1533
1534         smc = smc_sk(sk);
1535         lock_sock(sk);
1536         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1537                 /* socket was connected before, no more data to read */
1538                 rc = 0;
1539                 goto out;
1540         }
1541         if ((sk->sk_state == SMC_INIT) ||
1542             (sk->sk_state == SMC_LISTEN) ||
1543             (sk->sk_state == SMC_CLOSED))
1544                 goto out;
1545
1546         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1547                 rc = 0;
1548                 goto out;
1549         }
1550
1551         if (smc->use_fallback) {
1552                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1553         } else {
1554                 msg->msg_namelen = 0;
1555                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1556         }
1557
1558 out:
1559         release_sock(sk);
1560         return rc;
1561 }
1562
1563 static __poll_t smc_accept_poll(struct sock *parent)
1564 {
1565         struct smc_sock *isk = smc_sk(parent);
1566         __poll_t mask = 0;
1567
1568         spin_lock(&isk->accept_q_lock);
1569         if (!list_empty(&isk->accept_q))
1570                 mask = EPOLLIN | EPOLLRDNORM;
1571         spin_unlock(&isk->accept_q_lock);
1572
1573         return mask;
1574 }
1575
1576 static __poll_t smc_poll(struct file *file, struct socket *sock,
1577                              poll_table *wait)
1578 {
1579         struct sock *sk = sock->sk;
1580         struct smc_sock *smc;
1581         __poll_t mask = 0;
1582
1583         if (!sk)
1584                 return EPOLLNVAL;
1585
1586         smc = smc_sk(sock->sk);
1587         if (smc->use_fallback) {
1588                 /* delegate to CLC child sock */
1589                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1590                 sk->sk_err = smc->clcsock->sk->sk_err;
1591         } else {
1592                 if (sk->sk_state != SMC_CLOSED)
1593                         sock_poll_wait(file, sock, wait);
1594                 if (sk->sk_err)
1595                         mask |= EPOLLERR;
1596                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1597                     (sk->sk_state == SMC_CLOSED))
1598                         mask |= EPOLLHUP;
1599                 if (sk->sk_state == SMC_LISTEN) {
1600                         /* woken up by sk_data_ready in smc_listen_work() */
1601                         mask |= smc_accept_poll(sk);
1602                 } else if (smc->use_fallback) { /* as result of connect_work()*/
1603                         mask |= smc->clcsock->ops->poll(file, smc->clcsock,
1604                                                            wait);
1605                         sk->sk_err = smc->clcsock->sk->sk_err;
1606                 } else {
1607                         if ((sk->sk_state != SMC_INIT &&
1608                              atomic_read(&smc->conn.sndbuf_space)) ||
1609                             sk->sk_shutdown & SEND_SHUTDOWN) {
1610                                 mask |= EPOLLOUT | EPOLLWRNORM;
1611                         } else {
1612                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1613                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1614                         }
1615                         if (atomic_read(&smc->conn.bytes_to_rcv))
1616                                 mask |= EPOLLIN | EPOLLRDNORM;
1617                         if (sk->sk_shutdown & RCV_SHUTDOWN)
1618                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1619                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
1620                                 mask |= EPOLLIN;
1621                         if (smc->conn.urg_state == SMC_URG_VALID)
1622                                 mask |= EPOLLPRI;
1623                 }
1624         }
1625
1626         return mask;
1627 }
1628
1629 static int smc_shutdown(struct socket *sock, int how)
1630 {
1631         struct sock *sk = sock->sk;
1632         struct smc_sock *smc;
1633         int rc = -EINVAL;
1634         int rc1 = 0;
1635
1636         smc = smc_sk(sk);
1637
1638         if ((how < SHUT_RD) || (how > SHUT_RDWR))
1639                 return rc;
1640
1641         lock_sock(sk);
1642
1643         rc = -ENOTCONN;
1644         if ((sk->sk_state != SMC_ACTIVE) &&
1645             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1646             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1647             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1648             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1649             (sk->sk_state != SMC_APPFINCLOSEWAIT))
1650                 goto out;
1651         if (smc->use_fallback) {
1652                 rc = kernel_sock_shutdown(smc->clcsock, how);
1653                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1654                 if (sk->sk_shutdown == SHUTDOWN_MASK)
1655                         sk->sk_state = SMC_CLOSED;
1656                 goto out;
1657         }
1658         switch (how) {
1659         case SHUT_RDWR:         /* shutdown in both directions */
1660                 rc = smc_close_active(smc);
1661                 break;
1662         case SHUT_WR:
1663                 rc = smc_close_shutdown_write(smc);
1664                 break;
1665         case SHUT_RD:
1666                 rc = 0;
1667                 /* nothing more to do because peer is not involved */
1668                 break;
1669         }
1670         if (smc->clcsock)
1671                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1672         /* map sock_shutdown_cmd constants to sk_shutdown value range */
1673         sk->sk_shutdown |= how + 1;
1674
1675 out:
1676         release_sock(sk);
1677         return rc ? rc : rc1;
1678 }
1679
1680 static int smc_setsockopt(struct socket *sock, int level, int optname,
1681                           char __user *optval, unsigned int optlen)
1682 {
1683         struct sock *sk = sock->sk;
1684         struct smc_sock *smc;
1685         int val, rc;
1686
1687         smc = smc_sk(sk);
1688
1689         /* generic setsockopts reaching us here always apply to the
1690          * CLC socket
1691          */
1692         rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1693                                            optval, optlen);
1694         if (smc->clcsock->sk->sk_err) {
1695                 sk->sk_err = smc->clcsock->sk->sk_err;
1696                 sk->sk_error_report(sk);
1697         }
1698         if (rc)
1699                 return rc;
1700
1701         if (optlen < sizeof(int))
1702                 return -EINVAL;
1703         if (get_user(val, (int __user *)optval))
1704                 return -EFAULT;
1705
1706         lock_sock(sk);
1707         switch (optname) {
1708         case TCP_ULP:
1709         case TCP_FASTOPEN:
1710         case TCP_FASTOPEN_CONNECT:
1711         case TCP_FASTOPEN_KEY:
1712         case TCP_FASTOPEN_NO_COOKIE:
1713                 /* option not supported by SMC */
1714                 if (sk->sk_state == SMC_INIT) {
1715                         smc->use_fallback = true;
1716                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1717                 } else {
1718                         if (!smc->use_fallback)
1719                                 rc = -EINVAL;
1720                 }
1721                 break;
1722         case TCP_NODELAY:
1723                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1724                         if (val && !smc->use_fallback)
1725                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1726                                                  0);
1727                 }
1728                 break;
1729         case TCP_CORK:
1730                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1731                         if (!val && !smc->use_fallback)
1732                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1733                                                  0);
1734                 }
1735                 break;
1736         case TCP_DEFER_ACCEPT:
1737                 smc->sockopt_defer_accept = val;
1738                 break;
1739         default:
1740                 break;
1741         }
1742         release_sock(sk);
1743
1744         return rc;
1745 }
1746
1747 static int smc_getsockopt(struct socket *sock, int level, int optname,
1748                           char __user *optval, int __user *optlen)
1749 {
1750         struct smc_sock *smc;
1751
1752         smc = smc_sk(sock->sk);
1753         /* socket options apply to the CLC socket */
1754         return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1755                                              optval, optlen);
1756 }
1757
1758 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1759                      unsigned long arg)
1760 {
1761         union smc_host_cursor cons, urg;
1762         struct smc_connection *conn;
1763         struct smc_sock *smc;
1764         int answ;
1765
1766         smc = smc_sk(sock->sk);
1767         conn = &smc->conn;
1768         lock_sock(&smc->sk);
1769         if (smc->use_fallback) {
1770                 if (!smc->clcsock) {
1771                         release_sock(&smc->sk);
1772                         return -EBADF;
1773                 }
1774                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1775                 release_sock(&smc->sk);
1776                 return answ;
1777         }
1778         switch (cmd) {
1779         case SIOCINQ: /* same as FIONREAD */
1780                 if (smc->sk.sk_state == SMC_LISTEN) {
1781                         release_sock(&smc->sk);
1782                         return -EINVAL;
1783                 }
1784                 if (smc->sk.sk_state == SMC_INIT ||
1785                     smc->sk.sk_state == SMC_CLOSED)
1786                         answ = 0;
1787                 else
1788                         answ = atomic_read(&smc->conn.bytes_to_rcv);
1789                 break;
1790         case SIOCOUTQ:
1791                 /* output queue size (not send + not acked) */
1792                 if (smc->sk.sk_state == SMC_LISTEN) {
1793                         release_sock(&smc->sk);
1794                         return -EINVAL;
1795                 }
1796                 if (smc->sk.sk_state == SMC_INIT ||
1797                     smc->sk.sk_state == SMC_CLOSED)
1798                         answ = 0;
1799                 else
1800                         answ = smc->conn.sndbuf_desc->len -
1801                                         atomic_read(&smc->conn.sndbuf_space);
1802                 break;
1803         case SIOCOUTQNSD:
1804                 /* output queue size (not send only) */
1805                 if (smc->sk.sk_state == SMC_LISTEN) {
1806                         release_sock(&smc->sk);
1807                         return -EINVAL;
1808                 }
1809                 if (smc->sk.sk_state == SMC_INIT ||
1810                     smc->sk.sk_state == SMC_CLOSED)
1811                         answ = 0;
1812                 else
1813                         answ = smc_tx_prepared_sends(&smc->conn);
1814                 break;
1815         case SIOCATMARK:
1816                 if (smc->sk.sk_state == SMC_LISTEN) {
1817                         release_sock(&smc->sk);
1818                         return -EINVAL;
1819                 }
1820                 if (smc->sk.sk_state == SMC_INIT ||
1821                     smc->sk.sk_state == SMC_CLOSED) {
1822                         answ = 0;
1823                 } else {
1824                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1825                         smc_curs_copy(&urg, &conn->urg_curs, conn);
1826                         answ = smc_curs_diff(conn->rmb_desc->len,
1827                                              &cons, &urg) == 1;
1828                 }
1829                 break;
1830         default:
1831                 release_sock(&smc->sk);
1832                 return -ENOIOCTLCMD;
1833         }
1834         release_sock(&smc->sk);
1835
1836         return put_user(answ, (int __user *)arg);
1837 }
1838
1839 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1840                             int offset, size_t size, int flags)
1841 {
1842         struct sock *sk = sock->sk;
1843         struct smc_sock *smc;
1844         int rc = -EPIPE;
1845
1846         smc = smc_sk(sk);
1847         lock_sock(sk);
1848         if (sk->sk_state != SMC_ACTIVE) {
1849                 release_sock(sk);
1850                 goto out;
1851         }
1852         release_sock(sk);
1853         if (smc->use_fallback)
1854                 rc = kernel_sendpage(smc->clcsock, page, offset,
1855                                      size, flags);
1856         else
1857                 rc = sock_no_sendpage(sock, page, offset, size, flags);
1858
1859 out:
1860         return rc;
1861 }
1862
1863 /* Map the affected portions of the rmbe into an spd, note the number of bytes
1864  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
1865  * updates till whenever a respective page has been fully processed.
1866  * Note that subsequent recv() calls have to wait till all splice() processing
1867  * completed.
1868  */
1869 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1870                                struct pipe_inode_info *pipe, size_t len,
1871                                unsigned int flags)
1872 {
1873         struct sock *sk = sock->sk;
1874         struct smc_sock *smc;
1875         int rc = -ENOTCONN;
1876
1877         smc = smc_sk(sk);
1878         lock_sock(sk);
1879         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1880                 /* socket was connected before, no more data to read */
1881                 rc = 0;
1882                 goto out;
1883         }
1884         if (sk->sk_state == SMC_INIT ||
1885             sk->sk_state == SMC_LISTEN ||
1886             sk->sk_state == SMC_CLOSED)
1887                 goto out;
1888
1889         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1890                 rc = 0;
1891                 goto out;
1892         }
1893
1894         if (smc->use_fallback) {
1895                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1896                                                     pipe, len, flags);
1897         } else {
1898                 if (*ppos) {
1899                         rc = -ESPIPE;
1900                         goto out;
1901                 }
1902                 if (flags & SPLICE_F_NONBLOCK)
1903                         flags = MSG_DONTWAIT;
1904                 else
1905                         flags = 0;
1906                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1907         }
1908 out:
1909         release_sock(sk);
1910
1911         return rc;
1912 }
1913
1914 /* must look like tcp */
1915 static const struct proto_ops smc_sock_ops = {
1916         .family         = PF_SMC,
1917         .owner          = THIS_MODULE,
1918         .release        = smc_release,
1919         .bind           = smc_bind,
1920         .connect        = smc_connect,
1921         .socketpair     = sock_no_socketpair,
1922         .accept         = smc_accept,
1923         .getname        = smc_getname,
1924         .poll           = smc_poll,
1925         .ioctl          = smc_ioctl,
1926         .listen         = smc_listen,
1927         .shutdown       = smc_shutdown,
1928         .setsockopt     = smc_setsockopt,
1929         .getsockopt     = smc_getsockopt,
1930         .sendmsg        = smc_sendmsg,
1931         .recvmsg        = smc_recvmsg,
1932         .mmap           = sock_no_mmap,
1933         .sendpage       = smc_sendpage,
1934         .splice_read    = smc_splice_read,
1935 };
1936
1937 static int smc_create(struct net *net, struct socket *sock, int protocol,
1938                       int kern)
1939 {
1940         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1941         struct smc_sock *smc;
1942         struct sock *sk;
1943         int rc;
1944
1945         rc = -ESOCKTNOSUPPORT;
1946         if (sock->type != SOCK_STREAM)
1947                 goto out;
1948
1949         rc = -EPROTONOSUPPORT;
1950         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1951                 goto out;
1952
1953         rc = -ENOBUFS;
1954         sock->ops = &smc_sock_ops;
1955         sk = smc_sock_alloc(net, sock, protocol);
1956         if (!sk)
1957                 goto out;
1958
1959         /* create internal TCP socket for CLC handshake and fallback */
1960         smc = smc_sk(sk);
1961         smc->use_fallback = false; /* assume rdma capability first */
1962         smc->fallback_rsn = 0;
1963         rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1964                               &smc->clcsock);
1965         if (rc) {
1966                 sk_common_release(sk);
1967                 goto out;
1968         }
1969         smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1970         smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1971
1972 out:
1973         return rc;
1974 }
1975
1976 static const struct net_proto_family smc_sock_family_ops = {
1977         .family = PF_SMC,
1978         .owner  = THIS_MODULE,
1979         .create = smc_create,
1980 };
1981
1982 unsigned int smc_net_id;
1983
1984 static __net_init int smc_net_init(struct net *net)
1985 {
1986         return smc_pnet_net_init(net);
1987 }
1988
1989 static void __net_exit smc_net_exit(struct net *net)
1990 {
1991         smc_pnet_net_exit(net);
1992 }
1993
1994 static struct pernet_operations smc_net_ops = {
1995         .init = smc_net_init,
1996         .exit = smc_net_exit,
1997         .id   = &smc_net_id,
1998         .size = sizeof(struct smc_net),
1999 };
2000
2001 static int __init smc_init(void)
2002 {
2003         int rc;
2004
2005         rc = register_pernet_subsys(&smc_net_ops);
2006         if (rc)
2007                 return rc;
2008
2009         rc = smc_pnet_init();
2010         if (rc)
2011                 return rc;
2012
2013         rc = smc_llc_init();
2014         if (rc) {
2015                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2016                 goto out_pnet;
2017         }
2018
2019         rc = smc_cdc_init();
2020         if (rc) {
2021                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2022                 goto out_pnet;
2023         }
2024
2025         rc = proto_register(&smc_proto, 1);
2026         if (rc) {
2027                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2028                 goto out_pnet;
2029         }
2030
2031         rc = proto_register(&smc_proto6, 1);
2032         if (rc) {
2033                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2034                 goto out_proto;
2035         }
2036
2037         rc = sock_register(&smc_sock_family_ops);
2038         if (rc) {
2039                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2040                 goto out_proto6;
2041         }
2042         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2043         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2044
2045         rc = smc_ib_register_client();
2046         if (rc) {
2047                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2048                 goto out_sock;
2049         }
2050
2051         static_branch_enable(&tcp_have_smc);
2052         return 0;
2053
2054 out_sock:
2055         sock_unregister(PF_SMC);
2056 out_proto6:
2057         proto_unregister(&smc_proto6);
2058 out_proto:
2059         proto_unregister(&smc_proto);
2060 out_pnet:
2061         smc_pnet_exit();
2062         return rc;
2063 }
2064
2065 static void __exit smc_exit(void)
2066 {
2067         smc_core_exit();
2068         static_branch_disable(&tcp_have_smc);
2069         smc_ib_unregister_client();
2070         sock_unregister(PF_SMC);
2071         proto_unregister(&smc_proto6);
2072         proto_unregister(&smc_proto);
2073         smc_pnet_exit();
2074         unregister_pernet_subsys(&smc_net_ops);
2075 }
2076
2077 module_init(smc_init);
2078 module_exit(smc_exit);
2079
2080 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2081 MODULE_DESCRIPTION("smc socket address family");
2082 MODULE_LICENSE("GPL");
2083 MODULE_ALIAS_NETPROTO(PF_SMC);