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_info && sk->sk_state == SMC_INIT)
 138                 tcp_abort(smc->clcsock->sk, ECONNABORTED);
 139         flush_work(&smc->connect_work);
 140         kfree(smc->connect_info);
 141         smc->connect_info = NULL;
 142
 143         if (sk->sk_state == SMC_LISTEN)
 144                 /* smc_close_non_accepted() is called and acquires
 145                  * sock lock for child sockets again
 146                  */
 147                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 148         else
 149                 lock_sock(sk);
 150
 151         if (!smc->use_fallback) {
 152                 rc = smc_close_active(smc);
 153                 sock_set_flag(sk, SOCK_DEAD);
 154                 sk->sk_shutdown |= SHUTDOWN_MASK;
 155         } else {
 156                 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
 157                         sock_put(sk); /* passive closing */
 158                 if (sk->sk_state == SMC_LISTEN) {
 159                         /* wake up clcsock accept */
 160                         rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
 161                 }
 162                 sk->sk_state = SMC_CLOSED;
 163                 sk->sk_state_change(sk);
 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         /* detach socket */
 179         sock_orphan(sk);
 180         sock->sk = NULL;
 181         release_sock(sk);
 182
 183         sock_put(sk); /* final sock_put */
 184 out:
 185         return rc;
 186 }
 187
 188 static void smc_destruct(struct sock *sk)
 189 {
 190         if (sk->sk_state != SMC_CLOSED)
 191                 return;
 192         if (!sock_flag(sk, SOCK_DEAD))
 193                 return;
 194
 195         sk_refcnt_debug_dec(sk);
 196 }
 197
 198 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
 199                                    int protocol)
 200 {
 201         struct smc_sock *smc;
 202         struct proto *prot;
 203         struct sock *sk;
 204
 205         prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
 206         sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
 207         if (!sk)
 208                 return NULL;
 209
 210         sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
 211         sk->sk_state = SMC_INIT;
 212         sk->sk_destruct = smc_destruct;
 213         sk->sk_protocol = protocol;
 214         smc = smc_sk(sk);
 215         INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
 216         INIT_WORK(&smc->connect_work, smc_connect_work);
 217         INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
 218         INIT_LIST_HEAD(&smc->accept_q);
 219         spin_lock_init(&smc->accept_q_lock);
 220         spin_lock_init(&smc->conn.send_lock);
 221         sk->sk_prot->hash(sk);
 222         sk_refcnt_debug_inc(sk);
 223         mutex_init(&smc->clcsock_release_lock);
 224
 225         return sk;
 226 }
 227
 228 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
 229                     int addr_len)
 230 {
 231         struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 232         struct sock *sk = sock->sk;
 233         struct smc_sock *smc;
 234         int rc;
 235
 236         smc = smc_sk(sk);
 237
 238         /* replicate tests from inet_bind(), to be safe wrt. future changes */
 239         rc = -EINVAL;
 240         if (addr_len < sizeof(struct sockaddr_in))
 241                 goto out;
 242
 243         rc = -EAFNOSUPPORT;
 244         if (addr->sin_family != AF_INET &&
 245             addr->sin_family != AF_INET6 &&
 246             addr->sin_family != AF_UNSPEC)
 247                 goto out;
 248         /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
 249         if (addr->sin_family == AF_UNSPEC &&
 250             addr->sin_addr.s_addr != htonl(INADDR_ANY))
 251                 goto out;
 252
 253         lock_sock(sk);
 254
 255         /* Check if socket is already active */
 256         rc = -EINVAL;
 257         if (sk->sk_state != SMC_INIT)
 258                 goto out_rel;
 259
 260         smc->clcsock->sk->sk_reuse = sk->sk_reuse;
 261         rc = kernel_bind(smc->clcsock, uaddr, addr_len);
 262
 263 out_rel:
 264         release_sock(sk);
 265 out:
 266         return rc;
 267 }
 268
 269 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
 270                                    unsigned long mask)
 271 {
 272         /* options we don't get control via setsockopt for */
 273         nsk->sk_type = osk->sk_type;
 274         nsk->sk_sndbuf = osk->sk_sndbuf;
 275         nsk->sk_rcvbuf = osk->sk_rcvbuf;
 276         nsk->sk_sndtimeo = osk->sk_sndtimeo;
 277         nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
 278         nsk->sk_mark = osk->sk_mark;
 279         nsk->sk_priority = osk->sk_priority;
 280         nsk->sk_rcvlowat = osk->sk_rcvlowat;
 281         nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
 282         nsk->sk_err = osk->sk_err;
 283
 284         nsk->sk_flags &= ~mask;
 285         nsk->sk_flags |= osk->sk_flags & mask;
 286 }
 287
 288 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
 289                              (1UL << SOCK_KEEPOPEN) | \
 290                              (1UL << SOCK_LINGER) | \
 291                              (1UL << SOCK_BROADCAST) | \
 292                              (1UL << SOCK_TIMESTAMP) | \
 293                              (1UL << SOCK_DBG) | \
 294                              (1UL << SOCK_RCVTSTAMP) | \
 295                              (1UL << SOCK_RCVTSTAMPNS) | \
 296                              (1UL << SOCK_LOCALROUTE) | \
 297                              (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
 298                              (1UL << SOCK_RXQ_OVFL) | \
 299                              (1UL << SOCK_WIFI_STATUS) | \
 300                              (1UL << SOCK_NOFCS) | \
 301                              (1UL << SOCK_FILTER_LOCKED) | \
 302                              (1UL << SOCK_TSTAMP_NEW))
 303 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
 304  * clc socket (since smc is not called for these options from net/core)
 305  */
 306 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
 307 {
 308         smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
 309 }
 310
 311 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
 312                              (1UL << SOCK_KEEPOPEN) | \
 313                              (1UL << SOCK_LINGER) | \
 314                              (1UL << SOCK_DBG))
 315 /* copy only settings and flags relevant for smc from clc to smc socket */
 316 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
 317 {
 318         smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
 319 }
 320
 321 /* register a new rmb, send confirm_rkey msg to register with peer */
 322 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc,
 323                        bool conf_rkey)
 324 {
 325         if (!rmb_desc->wr_reg) {
 326                 /* register memory region for new rmb */
 327                 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
 328                         rmb_desc->regerr = 1;
 329                         return -EFAULT;
 330                 }
 331                 rmb_desc->wr_reg = 1;
 332         }
 333         if (!conf_rkey)
 334                 return 0;
 335         /* exchange confirm_rkey msg with peer */
 336         if (smc_llc_do_confirm_rkey(link, rmb_desc)) {
 337                 rmb_desc->regerr = 1;
 338                 return -EFAULT;
 339         }
 340         return 0;
 341 }
 342
 343 static int smc_clnt_conf_first_link(struct smc_sock *smc)
 344 {
 345         struct net *net = sock_net(smc->clcsock->sk);
 346         struct smc_link_group *lgr = smc->conn.lgr;
 347         struct smc_link *link;
 348         int rest;
 349         int rc;
 350
 351         link = &lgr->lnk[SMC_SINGLE_LINK];
 352         /* receive CONFIRM LINK request from server over RoCE fabric */
 353         rest = wait_for_completion_interruptible_timeout(
 354                 &link->llc_confirm,
 355                 SMC_LLC_WAIT_FIRST_TIME);
 356         if (rest <= 0) {
 357                 struct smc_clc_msg_decline dclc;
 358
 359                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 360                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 361                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
 362         }
 363
 364         if (link->llc_confirm_rc)
 365                 return SMC_CLC_DECL_RMBE_EC;
 366
 367         rc = smc_ib_modify_qp_rts(link);
 368         if (rc)
 369                 return SMC_CLC_DECL_ERR_RDYLNK;
 370
 371         smc_wr_remember_qp_attr(link);
 372
 373         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
 374                 return SMC_CLC_DECL_ERR_REGRMB;
 375
 376         /* send CONFIRM LINK response over RoCE fabric */
 377         rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
 378         if (rc < 0)
 379                 return SMC_CLC_DECL_TIMEOUT_CL;
 380
 381         /* receive ADD LINK request from server over RoCE fabric */
 382         rest = wait_for_completion_interruptible_timeout(&link->llc_add,
 383                                                          SMC_LLC_WAIT_TIME);
 384         if (rest <= 0) {
 385                 struct smc_clc_msg_decline dclc;
 386
 387                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
 388                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
 389                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
 390         }
 391
 392         /* send add link reject message, only one link supported for now */
 393         rc = smc_llc_send_add_link(link,
 394                                    link->smcibdev->mac[link->ibport - 1],
 395                                    link->gid, SMC_LLC_RESP);
 396         if (rc < 0)
 397                 return SMC_CLC_DECL_TIMEOUT_AL;
 398
 399         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
 400
 401         return 0;
 402 }
 403
 404 static void smcr_conn_save_peer_info(struct smc_sock *smc,
 405                                      struct smc_clc_msg_accept_confirm *clc)
 406 {
 407         int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
 408
 409         smc->conn.peer_rmbe_idx = clc->rmbe_idx;
 410         smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
 411         smc->conn.peer_rmbe_size = bufsize;
 412         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 413         smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
 414 }
 415
 416 static void smcd_conn_save_peer_info(struct smc_sock *smc,
 417                                      struct smc_clc_msg_accept_confirm *clc)
 418 {
 419         int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
 420
 421         smc->conn.peer_rmbe_idx = clc->dmbe_idx;
 422         smc->conn.peer_token = clc->token;
 423         /* msg header takes up space in the buffer */
 424         smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
 425         atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
 426         smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
 427 }
 428
 429 static void smc_conn_save_peer_info(struct smc_sock *smc,
 430                                     struct smc_clc_msg_accept_confirm *clc)
 431 {
 432         if (smc->conn.lgr->is_smcd)
 433                 smcd_conn_save_peer_info(smc, clc);
 434         else
 435                 smcr_conn_save_peer_info(smc, clc);
 436 }
 437
 438 static void smc_link_save_peer_info(struct smc_link *link,
 439                                     struct smc_clc_msg_accept_confirm *clc)
 440 {
 441         link->peer_qpn = ntoh24(clc->qpn);
 442         memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
 443         memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
 444         link->peer_psn = ntoh24(clc->psn);
 445         link->peer_mtu = clc->qp_mtu;
 446 }
 447
 448 static void smc_switch_to_fallback(struct smc_sock *smc)
 449 {
 450         smc->use_fallback = true;
 451         if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
 452                 smc->clcsock->file = smc->sk.sk_socket->file;
 453                 smc->clcsock->file->private_data = smc->clcsock;
 454         }
 455 }
 456
 457 /* fall back during connect */
 458 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 459 {
 460         smc_switch_to_fallback(smc);
 461         smc->fallback_rsn = reason_code;
 462         smc_copy_sock_settings_to_clc(smc);
 463         if (smc->sk.sk_state == SMC_INIT)
 464                 smc->sk.sk_state = SMC_ACTIVE;
 465         return 0;
 466 }
 467
 468 /* decline and fall back during connect */
 469 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
 470 {
 471         int rc;
 472
 473         if (reason_code < 0) { /* error, fallback is not possible */
 474                 if (smc->sk.sk_state == SMC_INIT)
 475                         sock_put(&smc->sk); /* passive closing */
 476                 return reason_code;
 477         }
 478         if (reason_code != SMC_CLC_DECL_PEERDECL) {
 479                 rc = smc_clc_send_decline(smc, reason_code);
 480                 if (rc < 0) {
 481                         if (smc->sk.sk_state == SMC_INIT)
 482                                 sock_put(&smc->sk); /* passive closing */
 483                         return rc;
 484                 }
 485         }
 486         return smc_connect_fallback(smc, reason_code);
 487 }
 488
 489 /* abort connecting */
 490 static int smc_connect_abort(struct smc_sock *smc, int reason_code,
 491                              int local_contact)
 492 {
 493         if (local_contact == SMC_FIRST_CONTACT)
 494                 smc_lgr_forget(smc->conn.lgr);
 495         if (smc->conn.lgr->is_smcd)
 496                 /* there is only one lgr role for SMC-D; use server lock */
 497                 mutex_unlock(&smc_server_lgr_pending);
 498         else
 499                 mutex_unlock(&smc_client_lgr_pending);
 500
 501         smc_conn_free(&smc->conn);
 502         return reason_code;
 503 }
 504
 505 /* check if there is a rdma device available for this connection. */
 506 /* called for connect and listen */
 507 static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev,
 508                           u8 *ibport, unsigned short vlan_id, u8 gid[])
 509 {
 510         int reason_code = 0;
 511
 512         /* PNET table look up: search active ib_device and port
 513          * within same PNETID that also contains the ethernet device
 514          * used for the internal TCP socket
 515          */
 516         smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport, vlan_id,
 517                                     gid);
 518         if (!(*ibdev))
 519                 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
 520
 521         return reason_code;
 522 }
 523
 524 /* check if there is an ISM device available for this connection. */
 525 /* called for connect and listen */
 526 static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev)
 527 {
 528         /* Find ISM device with same PNETID as connecting interface  */
 529         smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev);
 530         if (!(*ismdev))
 531                 return SMC_CLC_DECL_CNFERR; /* configuration error */
 532         return 0;
 533 }
 534
 535 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
 536 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
 537                                       struct smcd_dev *ismdev,
 538                                       unsigned short vlan_id)
 539 {
 540         if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id))
 541                 return SMC_CLC_DECL_CNFERR;
 542         return 0;
 543 }
 544
 545 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
 546  * used, the VLAN ID will be registered again during the connection setup.
 547  */
 548 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
 549                                         struct smcd_dev *ismdev,
 550                                         unsigned short vlan_id)
 551 {
 552         if (!is_smcd)
 553                 return 0;
 554         if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id))
 555                 return SMC_CLC_DECL_CNFERR;
 556         return 0;
 557 }
 558
 559 /* CLC handshake during connect */
 560 static int smc_connect_clc(struct smc_sock *smc, int smc_type,
 561                            struct smc_clc_msg_accept_confirm *aclc,
 562                            struct smc_ib_device *ibdev, u8 ibport,
 563                            u8 gid[], struct smcd_dev *ismdev)
 564 {
 565         int rc = 0;
 566
 567         /* do inband token exchange */
 568         rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, gid, ismdev);
 569         if (rc)
 570                 return rc;
 571         /* receive SMC Accept CLC message */
 572         return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT,
 573                                 CLC_WAIT_TIME);
 574 }
 575
 576 /* setup for RDMA connection of client */
 577 static int smc_connect_rdma(struct smc_sock *smc,
 578                             struct smc_clc_msg_accept_confirm *aclc,
 579                             struct smc_ib_device *ibdev, u8 ibport)
 580 {
 581         int local_contact = SMC_FIRST_CONTACT;
 582         struct smc_link *link;
 583         int reason_code = 0;
 584
 585         mutex_lock(&smc_client_lgr_pending);
 586         local_contact = smc_conn_create(smc, false, aclc->hdr.flag, ibdev,
 587                                         ibport, ntoh24(aclc->qpn), &aclc->lcl,
 588                                         NULL, 0);
 589         if (local_contact < 0) {
 590                 if (local_contact == -ENOMEM)
 591                         reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
 592                 else if (local_contact == -ENOLINK)
 593                         reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
 594                 else
 595                         reason_code = SMC_CLC_DECL_INTERR; /* other error */
 596                 mutex_unlock(&smc_client_lgr_pending);
 597                 return reason_code;
 598         }
 599         link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
 600
 601         smc_conn_save_peer_info(smc, aclc);
 602
 603         /* create send buffer and rmb */
 604         if (smc_buf_create(smc, false))
 605                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
 606
 607         if (local_contact == SMC_FIRST_CONTACT)
 608                 smc_link_save_peer_info(link, aclc);
 609
 610         if (smc_rmb_rtoken_handling(&smc->conn, aclc))
 611                 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
 612                                          local_contact);
 613
 614         smc_close_init(smc);
 615         smc_rx_init(smc);
 616
 617         if (local_contact == SMC_FIRST_CONTACT) {
 618                 if (smc_ib_ready_link(link))
 619                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
 620                                                  local_contact);
 621         } else {
 622                 if (smc_reg_rmb(link, smc->conn.rmb_desc, true))
 623                         return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
 624                                                  local_contact);
 625         }
 626         smc_rmb_sync_sg_for_device(&smc->conn);
 627
 628         reason_code = smc_clc_send_confirm(smc);
 629         if (reason_code)
 630                 return smc_connect_abort(smc, reason_code, local_contact);
 631
 632         smc_tx_init(smc);
 633
 634         if (local_contact == SMC_FIRST_CONTACT) {
 635                 /* QP confirmation over RoCE fabric */
 636                 reason_code = smc_clnt_conf_first_link(smc);
 637                 if (reason_code)
 638                         return smc_connect_abort(smc, reason_code,
 639                                                  local_contact);
 640         }
 641         mutex_unlock(&smc_client_lgr_pending);
 642
 643         smc_copy_sock_settings_to_clc(smc);
 644         if (smc->sk.sk_state == SMC_INIT)
 645                 smc->sk.sk_state = SMC_ACTIVE;
 646
 647         return 0;
 648 }
 649
 650 /* setup for ISM connection of client */
 651 static int smc_connect_ism(struct smc_sock *smc,
 652                            struct smc_clc_msg_accept_confirm *aclc,
 653                            struct smcd_dev *ismdev)
 654 {
 655         int local_contact = SMC_FIRST_CONTACT;
 656         int rc = 0;
 657
 658         /* there is only one lgr role for SMC-D; use server lock */
 659         mutex_lock(&smc_server_lgr_pending);
 660         local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0, 0,
 661                                         NULL, ismdev, aclc->gid);
 662         if (local_contact < 0) {
 663                 mutex_unlock(&smc_server_lgr_pending);
 664                 return SMC_CLC_DECL_MEM;
 665         }
 666
 667         /* Create send and receive buffers */
 668         if (smc_buf_create(smc, true))
 669                 return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact);
 670
 671         smc_conn_save_peer_info(smc, aclc);
 672         smc_close_init(smc);
 673         smc_rx_init(smc);
 674         smc_tx_init(smc);
 675
 676         rc = smc_clc_send_confirm(smc);
 677         if (rc)
 678                 return smc_connect_abort(smc, rc, local_contact);
 679         mutex_unlock(&smc_server_lgr_pending);
 680
 681         smc_copy_sock_settings_to_clc(smc);
 682         if (smc->sk.sk_state == SMC_INIT)
 683                 smc->sk.sk_state = SMC_ACTIVE;
 684
 685         return 0;
 686 }
 687
 688 /* perform steps before actually connecting */
 689 static int __smc_connect(struct smc_sock *smc)
 690 {
 691         bool ism_supported = false, rdma_supported = false;
 692         struct smc_clc_msg_accept_confirm aclc;
 693         struct smc_ib_device *ibdev;
 694         struct smcd_dev *ismdev;
 695         u8 gid[SMC_GID_SIZE];
 696         unsigned short vlan;
 697         int smc_type;
 698         int rc = 0;
 699         u8 ibport;
 700
 701         sock_hold(&smc->sk); /* sock put in passive closing */
 702
 703         if (smc->use_fallback)
 704                 return smc_connect_fallback(smc, smc->fallback_rsn);
 705
 706         /* if peer has not signalled SMC-capability, fall back */
 707         if (!tcp_sk(smc->clcsock->sk)->syn_smc)
 708                 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
 709
 710         /* IPSec connections opt out of SMC-R optimizations */
 711         if (using_ipsec(smc))
 712                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
 713
 714         /* check for VLAN ID */
 715         if (smc_vlan_by_tcpsk(smc->clcsock, &vlan))
 716                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR);
 717
 718         /* check if there is an ism device available */
 719         if (!smc_check_ism(smc, &ismdev) &&
 720             !smc_connect_ism_vlan_setup(smc, ismdev, vlan)) {
 721                 /* ISM is supported for this connection */
 722                 ism_supported = true;
 723                 smc_type = SMC_TYPE_D;
 724         }
 725
 726         /* check if there is a rdma device available */
 727         if (!smc_check_rdma(smc, &ibdev, &ibport, vlan, gid)) {
 728                 /* RDMA is supported for this connection */
 729                 rdma_supported = true;
 730                 if (ism_supported)
 731                         smc_type = SMC_TYPE_B; /* both */
 732                 else
 733                         smc_type = SMC_TYPE_R; /* only RDMA */
 734         }
 735
 736         /* if neither ISM nor RDMA are supported, fallback */
 737         if (!rdma_supported && !ism_supported)
 738                 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
 739
 740         /* perform CLC handshake */
 741         rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, gid, ismdev);
 742         if (rc) {
 743                 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
 744                 return smc_connect_decline_fallback(smc, rc);
 745         }
 746
 747         /* depending on previous steps, connect using rdma or ism */
 748         if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
 749                 rc = smc_connect_rdma(smc, &aclc, ibdev, ibport);
 750         else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
 751                 rc = smc_connect_ism(smc, &aclc, ismdev);
 752         else
 753                 rc = SMC_CLC_DECL_MODEUNSUPP;
 754         if (rc) {
 755                 smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
 756                 return smc_connect_decline_fallback(smc, rc);
 757         }
 758
 759         smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan);
 760         return 0;
 761 }
 762
 763 static void smc_connect_work(struct work_struct *work)
 764 {
 765         struct smc_sock *smc = container_of(work, struct smc_sock,
 766                                             connect_work);
 767         int rc;
 768
 769         lock_sock(&smc->sk);
 770         rc = kernel_connect(smc->clcsock, &smc->connect_info->addr,
 771                             smc->connect_info->alen, smc->connect_info->flags);
 772         if (smc->clcsock->sk->sk_err) {
 773                 smc->sk.sk_err = smc->clcsock->sk->sk_err;
 774                 goto out;
 775         }
 776         if (rc < 0) {
 777                 smc->sk.sk_err = -rc;
 778                 goto out;
 779         }
 780
 781         rc = __smc_connect(smc);
 782         if (rc < 0)
 783                 smc->sk.sk_err = -rc;
 784
 785 out:
 786         if (!sock_flag(&smc->sk, SOCK_DEAD)) {
 787                 if (smc->sk.sk_err) {
 788                         smc->sk.sk_state_change(&smc->sk);
 789                 } else { /* allow polling before and after fallback decision */
 790                         smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
 791                         smc->sk.sk_write_space(&smc->sk);
 792                 }
 793         }
 794         kfree(smc->connect_info);
 795         smc->connect_info = NULL;
 796         release_sock(&smc->sk);
 797 }
 798
 799 static int smc_connect(struct socket *sock, struct sockaddr *addr,
 800                        int alen, int flags)
 801 {
 802         struct sock *sk = sock->sk;
 803         struct smc_sock *smc;
 804         int rc = -EINVAL;
 805
 806         smc = smc_sk(sk);
 807
 808         /* separate smc parameter checking to be safe */
 809         if (alen < sizeof(addr->sa_family))
 810                 goto out_err;
 811         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
 812                 goto out_err;
 813
 814         lock_sock(sk);
 815         switch (sk->sk_state) {
 816         default:
 817                 goto out;
 818         case SMC_ACTIVE:
 819                 rc = -EISCONN;
 820                 goto out;
 821         case SMC_INIT:
 822                 rc = 0;
 823                 break;
 824         }
 825
 826         smc_copy_sock_settings_to_clc(smc);
 827         tcp_sk(smc->clcsock->sk)->syn_smc = 1;
 828         if (flags & O_NONBLOCK) {
 829                 if (smc->connect_info) {
 830                         rc = -EALREADY;
 831                         goto out;
 832                 }
 833                 smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL);
 834                 if (!smc->connect_info) {
 835                         rc = -ENOMEM;
 836                         goto out;
 837                 }
 838                 smc->connect_info->alen = alen;
 839                 smc->connect_info->flags = flags ^ O_NONBLOCK;
 840                 memcpy(&smc->connect_info->addr, addr, alen);
 841                 schedule_work(&smc->connect_work);
 842                 rc = -EINPROGRESS;
 843         } else {
 844                 rc = kernel_connect(smc->clcsock, addr, alen, flags);
 845                 if (rc)
 846                         goto out;
 847
 848                 rc = __smc_connect(smc);
 849                 if (rc < 0)
 850                         goto out;
 851                 else
 852                         rc = 0; /* success cases including fallback */
 853         }
 854
 855 out:
 856         release_sock(sk);
 857 out_err:
 858         return rc;
 859 }
 860
 861 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
 862 {
 863         struct socket *new_clcsock = NULL;
 864         struct sock *lsk = &lsmc->sk;
 865         struct sock *new_sk;
 866         int rc = -EINVAL;
 867
 868         release_sock(lsk);
 869         new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
 870         if (!new_sk) {
 871                 rc = -ENOMEM;
 872                 lsk->sk_err = ENOMEM;
 873                 *new_smc = NULL;
 874                 lock_sock(lsk);
 875                 goto out;
 876         }
 877         *new_smc = smc_sk(new_sk);
 878
 879         mutex_lock(&lsmc->clcsock_release_lock);
 880         if (lsmc->clcsock)
 881                 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
 882         mutex_unlock(&lsmc->clcsock_release_lock);
 883         lock_sock(lsk);
 884         if  (rc < 0)
 885                 lsk->sk_err = -rc;
 886         if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
 887                 new_sk->sk_prot->unhash(new_sk);
 888                 if (new_clcsock)
 889                         sock_release(new_clcsock);
 890                 new_sk->sk_state = SMC_CLOSED;
 891                 sock_set_flag(new_sk, SOCK_DEAD);
 892                 sock_put(new_sk); /* final */
 893                 *new_smc = NULL;
 894                 goto out;
 895         }
 896
 897         (*new_smc)->clcsock = new_clcsock;
 898 out:
 899         return rc;
 900 }
 901
 902 /* add a just created sock to the accept queue of the listen sock as
 903  * candidate for a following socket accept call from user space
 904  */
 905 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
 906 {
 907         struct smc_sock *par = smc_sk(parent);
 908
 909         sock_hold(sk); /* sock_put in smc_accept_unlink () */
 910         spin_lock(&par->accept_q_lock);
 911         list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
 912         spin_unlock(&par->accept_q_lock);
 913         sk_acceptq_added(parent);
 914 }
 915
 916 /* remove a socket from the accept queue of its parental listening socket */
 917 static void smc_accept_unlink(struct sock *sk)
 918 {
 919         struct smc_sock *par = smc_sk(sk)->listen_smc;
 920
 921         spin_lock(&par->accept_q_lock);
 922         list_del_init(&smc_sk(sk)->accept_q);
 923         spin_unlock(&par->accept_q_lock);
 924         sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
 925         sock_put(sk); /* sock_hold in smc_accept_enqueue */
 926 }
 927
 928 /* remove a sock from the accept queue to bind it to a new socket created
 929  * for a socket accept call from user space
 930  */
 931 struct sock *smc_accept_dequeue(struct sock *parent,
 932                                 struct socket *new_sock)
 933 {
 934         struct smc_sock *isk, *n;
 935         struct sock *new_sk;
 936
 937         list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
 938                 new_sk = (struct sock *)isk;
 939
 940                 smc_accept_unlink(new_sk);
 941                 if (new_sk->sk_state == SMC_CLOSED) {
 942                         new_sk->sk_prot->unhash(new_sk);
 943                         if (isk->clcsock) {
 944                                 sock_release(isk->clcsock);
 945                                 isk->clcsock = NULL;
 946                         }
 947                         sock_put(new_sk); /* final */
 948                         continue;
 949                 }
 950                 if (new_sock) {
 951                         sock_graft(new_sk, new_sock);
 952                         if (isk->use_fallback) {
 953                                 smc_sk(new_sk)->clcsock->file = new_sock->file;
 954                                 isk->clcsock->file->private_data = isk->clcsock;
 955                         }
 956                 }
 957                 return new_sk;
 958         }
 959         return NULL;
 960 }
 961
 962 /* clean up for a created but never accepted sock */
 963 void smc_close_non_accepted(struct sock *sk)
 964 {
 965         struct smc_sock *smc = smc_sk(sk);
 966
 967         lock_sock(sk);
 968         if (!sk->sk_lingertime)
 969                 /* wait for peer closing */
 970                 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
 971         if (!smc->use_fallback) {
 972                 smc_close_active(smc);
 973                 sock_set_flag(sk, SOCK_DEAD);
 974                 sk->sk_shutdown |= SHUTDOWN_MASK;
 975         }
 976         sk->sk_prot->unhash(sk);
 977         if (smc->clcsock) {
 978                 struct socket *tcp;
 979
 980                 tcp = smc->clcsock;
 981                 smc->clcsock = NULL;
 982                 sock_release(tcp);
 983         }
 984         if (smc->use_fallback) {
 985                 sock_put(sk); /* passive closing */
 986                 sk->sk_state = SMC_CLOSED;
 987         } else {
 988                 if (sk->sk_state == SMC_CLOSED)
 989                         smc_conn_free(&smc->conn);
 990         }
 991         release_sock(sk);
 992         sock_put(sk); /* final sock_put */
 993 }
 994
 995 static int smc_serv_conf_first_link(struct smc_sock *smc)
 996 {
 997         struct net *net = sock_net(smc->clcsock->sk);
 998         struct smc_link_group *lgr = smc->conn.lgr;
 999         struct smc_link *link;
1000         int rest;
1001         int rc;
1002
1003         link = &lgr->lnk[SMC_SINGLE_LINK];
1004
1005         if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
1006                 return SMC_CLC_DECL_ERR_REGRMB;
1007
1008         /* send CONFIRM LINK request to client over the RoCE fabric */
1009         rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1010         if (rc < 0)
1011                 return SMC_CLC_DECL_TIMEOUT_CL;
1012
1013         /* receive CONFIRM LINK response from client over the RoCE fabric */
1014         rest = wait_for_completion_interruptible_timeout(
1015                 &link->llc_confirm_resp,
1016                 SMC_LLC_WAIT_FIRST_TIME);
1017         if (rest <= 0) {
1018                 struct smc_clc_msg_decline dclc;
1019
1020                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1021                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1022                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1023         }
1024
1025         if (link->llc_confirm_resp_rc)
1026                 return SMC_CLC_DECL_RMBE_EC;
1027
1028         /* send ADD LINK request to client over the RoCE fabric */
1029         rc = smc_llc_send_add_link(link,
1030                                    link->smcibdev->mac[link->ibport - 1],
1031                                    link->gid, SMC_LLC_REQ);
1032         if (rc < 0)
1033                 return SMC_CLC_DECL_TIMEOUT_AL;
1034
1035         /* receive ADD LINK response from client over the RoCE fabric */
1036         rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
1037                                                          SMC_LLC_WAIT_TIME);
1038         if (rest <= 0) {
1039                 struct smc_clc_msg_decline dclc;
1040
1041                 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1042                                       SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1043                 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
1044         }
1045
1046         smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
1047
1048         return 0;
1049 }
1050
1051 /* listen worker: finish */
1052 static void smc_listen_out(struct smc_sock *new_smc)
1053 {
1054         struct smc_sock *lsmc = new_smc->listen_smc;
1055         struct sock *newsmcsk = &new_smc->sk;
1056
1057         if (lsmc->sk.sk_state == SMC_LISTEN) {
1058                 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1059                 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1060                 release_sock(&lsmc->sk);
1061         } else { /* no longer listening */
1062                 smc_close_non_accepted(newsmcsk);
1063         }
1064
1065         /* Wake up accept */
1066         lsmc->sk.sk_data_ready(&lsmc->sk);
1067         sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1068 }
1069
1070 /* listen worker: finish in state connected */
1071 static void smc_listen_out_connected(struct smc_sock *new_smc)
1072 {
1073         struct sock *newsmcsk = &new_smc->sk;
1074
1075         sk_refcnt_debug_inc(newsmcsk);
1076         if (newsmcsk->sk_state == SMC_INIT)
1077                 newsmcsk->sk_state = SMC_ACTIVE;
1078
1079         smc_listen_out(new_smc);
1080 }
1081
1082 /* listen worker: finish in error state */
1083 static void smc_listen_out_err(struct smc_sock *new_smc)
1084 {
1085         struct sock *newsmcsk = &new_smc->sk;
1086
1087         if (newsmcsk->sk_state == SMC_INIT)
1088                 sock_put(&new_smc->sk); /* passive closing */
1089         newsmcsk->sk_state = SMC_CLOSED;
1090         smc_conn_free(&new_smc->conn);
1091
1092         smc_listen_out(new_smc);
1093 }
1094
1095 /* listen worker: decline and fall back if possible */
1096 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1097                                int local_contact)
1098 {
1099         /* RDMA setup failed, switch back to TCP */
1100         if (local_contact == SMC_FIRST_CONTACT)
1101                 smc_lgr_forget(new_smc->conn.lgr);
1102         if (reason_code < 0) { /* error, no fallback possible */
1103                 smc_listen_out_err(new_smc);
1104                 return;
1105         }
1106         smc_conn_free(&new_smc->conn);
1107         smc_switch_to_fallback(new_smc);
1108         new_smc->fallback_rsn = reason_code;
1109         if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1110                 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1111                         smc_listen_out_err(new_smc);
1112                         return;
1113                 }
1114         }
1115         smc_listen_out_connected(new_smc);
1116 }
1117
1118 /* listen worker: check prefixes */
1119 static int smc_listen_rdma_check(struct smc_sock *new_smc,
1120                                  struct smc_clc_msg_proposal *pclc)
1121 {
1122         struct smc_clc_msg_proposal_prefix *pclc_prfx;
1123         struct socket *newclcsock = new_smc->clcsock;
1124
1125         pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1126         if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1127                 return SMC_CLC_DECL_CNFERR;
1128
1129         return 0;
1130 }
1131
1132 /* listen worker: initialize connection and buffers */
1133 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1134                                 struct smc_clc_msg_proposal *pclc,
1135                                 struct smc_ib_device *ibdev, u8 ibport,
1136                                 int *local_contact)
1137 {
1138         /* allocate connection / link group */
1139         *local_contact = smc_conn_create(new_smc, false, 0, ibdev, ibport, 0,
1140                                          &pclc->lcl, NULL, 0);
1141         if (*local_contact < 0) {
1142                 if (*local_contact == -ENOMEM)
1143                         return SMC_CLC_DECL_MEM;/* insufficient memory*/
1144                 return SMC_CLC_DECL_INTERR; /* other error */
1145         }
1146
1147         /* create send buffer and rmb */
1148         if (smc_buf_create(new_smc, false))
1149                 return SMC_CLC_DECL_MEM;
1150
1151         return 0;
1152 }
1153
1154 /* listen worker: initialize connection and buffers for SMC-D */
1155 static int smc_listen_ism_init(struct smc_sock *new_smc,
1156                                struct smc_clc_msg_proposal *pclc,
1157                                struct smcd_dev *ismdev,
1158                                int *local_contact)
1159 {
1160         struct smc_clc_msg_smcd *pclc_smcd;
1161
1162         pclc_smcd = smc_get_clc_msg_smcd(pclc);
1163         *local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, 0, NULL,
1164                                          ismdev, pclc_smcd->gid);
1165         if (*local_contact < 0) {
1166                 if (*local_contact == -ENOMEM)
1167                         return SMC_CLC_DECL_MEM;/* insufficient memory*/
1168                 return SMC_CLC_DECL_INTERR; /* other error */
1169         }
1170
1171         /* Check if peer can be reached via ISM device */
1172         if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1173                             new_smc->conn.lgr->vlan_id,
1174                             new_smc->conn.lgr->smcd)) {
1175                 if (*local_contact == SMC_FIRST_CONTACT)
1176                         smc_lgr_forget(new_smc->conn.lgr);
1177                 smc_conn_free(&new_smc->conn);
1178                 return SMC_CLC_DECL_CNFERR;
1179         }
1180
1181         /* Create send and receive buffers */
1182         if (smc_buf_create(new_smc, true)) {
1183                 if (*local_contact == SMC_FIRST_CONTACT)
1184                         smc_lgr_forget(new_smc->conn.lgr);
1185                 smc_conn_free(&new_smc->conn);
1186                 return SMC_CLC_DECL_MEM;
1187         }
1188
1189         return 0;
1190 }
1191
1192 /* listen worker: register buffers */
1193 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1194 {
1195         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1196
1197         if (local_contact != SMC_FIRST_CONTACT) {
1198                 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
1199                         return SMC_CLC_DECL_ERR_REGRMB;
1200         }
1201         smc_rmb_sync_sg_for_device(&new_smc->conn);
1202
1203         return 0;
1204 }
1205
1206 /* listen worker: finish RDMA setup */
1207 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1208                                   struct smc_clc_msg_accept_confirm *cclc,
1209                                   int local_contact)
1210 {
1211         struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1212         int reason_code = 0;
1213
1214         if (local_contact == SMC_FIRST_CONTACT)
1215                 smc_link_save_peer_info(link, cclc);
1216
1217         if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
1218                 reason_code = SMC_CLC_DECL_ERR_RTOK;
1219                 goto decline;
1220         }
1221
1222         if (local_contact == SMC_FIRST_CONTACT) {
1223                 if (smc_ib_ready_link(link)) {
1224                         reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1225                         goto decline;
1226                 }
1227                 /* QP confirmation over RoCE fabric */
1228                 reason_code = smc_serv_conf_first_link(new_smc);
1229                 if (reason_code)
1230                         goto decline;
1231         }
1232         return 0;
1233
1234 decline:
1235         smc_listen_decline(new_smc, reason_code, local_contact);
1236         return reason_code;
1237 }
1238
1239 /* setup for RDMA connection of server */
1240 static void smc_listen_work(struct work_struct *work)
1241 {
1242         struct smc_sock *new_smc = container_of(work, struct smc_sock,
1243                                                 smc_listen_work);
1244         struct socket *newclcsock = new_smc->clcsock;
1245         struct smc_clc_msg_accept_confirm cclc;
1246         struct smc_clc_msg_proposal *pclc;
1247         struct smc_ib_device *ibdev;
1248         bool ism_supported = false;
1249         struct smcd_dev *ismdev;
1250         u8 buf[SMC_CLC_MAX_LEN];
1251         int local_contact = 0;
1252         unsigned short vlan;
1253         int reason_code = 0;
1254         int rc = 0;
1255         u8 ibport;
1256
1257         if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1258                 return smc_listen_out_err(new_smc);
1259
1260         if (new_smc->use_fallback) {
1261                 smc_listen_out_connected(new_smc);
1262                 return;
1263         }
1264
1265         /* check if peer is smc capable */
1266         if (!tcp_sk(newclcsock->sk)->syn_smc) {
1267                 smc_switch_to_fallback(new_smc);
1268                 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1269                 smc_listen_out_connected(new_smc);
1270                 return;
1271         }
1272
1273         /* do inband token exchange -
1274          * wait for and receive SMC Proposal CLC message
1275          */
1276         pclc = (struct smc_clc_msg_proposal *)&buf;
1277         reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1278                                        SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1279         if (reason_code) {
1280                 smc_listen_decline(new_smc, reason_code, 0);
1281                 return;
1282         }
1283
1284         /* IPSec connections opt out of SMC-R optimizations */
1285         if (using_ipsec(new_smc)) {
1286                 smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0);
1287                 return;
1288         }
1289
1290         mutex_lock(&smc_server_lgr_pending);
1291         smc_close_init(new_smc);
1292         smc_rx_init(new_smc);
1293         smc_tx_init(new_smc);
1294
1295         /* check if ISM is available */
1296         if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) &&
1297             !smc_check_ism(new_smc, &ismdev) &&
1298             !smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) {
1299                 ism_supported = true;
1300         }
1301
1302         /* check if RDMA is available */
1303         if (!ism_supported &&
1304             ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) ||
1305              smc_vlan_by_tcpsk(new_smc->clcsock, &vlan) ||
1306              smc_check_rdma(new_smc, &ibdev, &ibport, vlan, NULL) ||
1307              smc_listen_rdma_check(new_smc, pclc) ||
1308              smc_listen_rdma_init(new_smc, pclc, ibdev, ibport,
1309                                   &local_contact) ||
1310              smc_listen_rdma_reg(new_smc, local_contact))) {
1311                 /* SMC not supported, decline */
1312                 mutex_unlock(&smc_server_lgr_pending);
1313                 smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP,
1314                                    local_contact);
1315                 return;
1316         }
1317
1318         /* send SMC Accept CLC message */
1319         rc = smc_clc_send_accept(new_smc, local_contact);
1320         if (rc) {
1321                 mutex_unlock(&smc_server_lgr_pending);
1322                 smc_listen_decline(new_smc, rc, local_contact);
1323                 return;
1324         }
1325
1326         /* SMC-D does not need this lock any more */
1327         if (ism_supported)
1328                 mutex_unlock(&smc_server_lgr_pending);
1329
1330         /* receive SMC Confirm CLC message */
1331         reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1332                                        SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1333         if (reason_code) {
1334                 if (!ism_supported)
1335                         mutex_unlock(&smc_server_lgr_pending);
1336                 smc_listen_decline(new_smc, reason_code, local_contact);
1337                 return;
1338         }
1339
1340         /* finish worker */
1341         if (!ism_supported) {
1342                 rc = smc_listen_rdma_finish(new_smc, &cclc, local_contact);
1343                 mutex_unlock(&smc_server_lgr_pending);
1344                 if (rc)
1345                         return;
1346         }
1347         smc_conn_save_peer_info(new_smc, &cclc);
1348         smc_listen_out_connected(new_smc);
1349 }
1350
1351 static void smc_tcp_listen_work(struct work_struct *work)
1352 {
1353         struct smc_sock *lsmc = container_of(work, struct smc_sock,
1354                                              tcp_listen_work);
1355         struct sock *lsk = &lsmc->sk;
1356         struct smc_sock *new_smc;
1357         int rc = 0;
1358
1359         lock_sock(lsk);
1360         while (lsk->sk_state == SMC_LISTEN) {
1361                 rc = smc_clcsock_accept(lsmc, &new_smc);
1362                 if (rc)
1363                         goto out;
1364                 if (!new_smc)
1365                         continue;
1366
1367                 new_smc->listen_smc = lsmc;
1368                 new_smc->use_fallback = lsmc->use_fallback;
1369                 new_smc->fallback_rsn = lsmc->fallback_rsn;
1370                 sock_hold(lsk); /* sock_put in smc_listen_work */
1371                 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1372                 smc_copy_sock_settings_to_smc(new_smc);
1373                 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1374                 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1375                 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1376                 if (!schedule_work(&new_smc->smc_listen_work))
1377                         sock_put(&new_smc->sk);
1378         }
1379
1380 out:
1381         release_sock(lsk);
1382         sock_put(&lsmc->sk); /* sock_hold in smc_listen */
1383 }
1384
1385 static int smc_listen(struct socket *sock, int backlog)
1386 {
1387         struct sock *sk = sock->sk;
1388         struct smc_sock *smc;
1389         int rc;
1390
1391         smc = smc_sk(sk);
1392         lock_sock(sk);
1393
1394         rc = -EINVAL;
1395         if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
1396                 goto out;
1397
1398         rc = 0;
1399         if (sk->sk_state == SMC_LISTEN) {
1400                 sk->sk_max_ack_backlog = backlog;
1401                 goto out;
1402         }
1403         /* some socket options are handled in core, so we could not apply
1404          * them to the clc socket -- copy smc socket options to clc socket
1405          */
1406         smc_copy_sock_settings_to_clc(smc);
1407         if (!smc->use_fallback)
1408                 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1409
1410         rc = kernel_listen(smc->clcsock, backlog);
1411         if (rc)
1412                 goto out;
1413         sk->sk_max_ack_backlog = backlog;
1414         sk->sk_ack_backlog = 0;
1415         sk->sk_state = SMC_LISTEN;
1416         sock_hold(sk); /* sock_hold in tcp_listen_worker */
1417         if (!schedule_work(&smc->tcp_listen_work))
1418                 sock_put(sk);
1419
1420 out:
1421         release_sock(sk);
1422         return rc;
1423 }
1424
1425 static int smc_accept(struct socket *sock, struct socket *new_sock,
1426                       int flags, bool kern)
1427 {
1428         struct sock *sk = sock->sk, *nsk;
1429         DECLARE_WAITQUEUE(wait, current);
1430         struct smc_sock *lsmc;
1431         long timeo;
1432         int rc = 0;
1433
1434         lsmc = smc_sk(sk);
1435         sock_hold(sk); /* sock_put below */
1436         lock_sock(sk);
1437
1438         if (lsmc->sk.sk_state != SMC_LISTEN) {
1439                 rc = -EINVAL;
1440                 release_sock(sk);
1441                 goto out;
1442         }
1443
1444         /* Wait for an incoming connection */
1445         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1446         add_wait_queue_exclusive(sk_sleep(sk), &wait);
1447         while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1448                 set_current_state(TASK_INTERRUPTIBLE);
1449                 if (!timeo) {
1450                         rc = -EAGAIN;
1451                         break;
1452                 }
1453                 release_sock(sk);
1454                 timeo = schedule_timeout(timeo);
1455                 /* wakeup by sk_data_ready in smc_listen_work() */
1456                 sched_annotate_sleep();
1457                 lock_sock(sk);
1458                 if (signal_pending(current)) {
1459                         rc = sock_intr_errno(timeo);
1460                         break;
1461                 }
1462         }
1463         set_current_state(TASK_RUNNING);
1464         remove_wait_queue(sk_sleep(sk), &wait);
1465
1466         if (!rc)
1467                 rc = sock_error(nsk);
1468         release_sock(sk);
1469         if (rc)
1470                 goto out;
1471
1472         if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1473                 /* wait till data arrives on the socket */
1474                 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1475                                                                 MSEC_PER_SEC);
1476                 if (smc_sk(nsk)->use_fallback) {
1477                         struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1478
1479                         lock_sock(clcsk);
1480                         if (skb_queue_empty(&clcsk->sk_receive_queue))
1481                                 sk_wait_data(clcsk, &timeo, NULL);
1482                         release_sock(clcsk);
1483                 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1484                         lock_sock(nsk);
1485                         smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1486                         release_sock(nsk);
1487                 }
1488         }
1489
1490 out:
1491         sock_put(sk); /* sock_hold above */
1492         return rc;
1493 }
1494
1495 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1496                        int peer)
1497 {
1498         struct smc_sock *smc;
1499
1500         if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1501             (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1502                 return -ENOTCONN;
1503
1504         smc = smc_sk(sock->sk);
1505
1506         return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1507 }
1508
1509 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1510 {
1511         struct sock *sk = sock->sk;
1512         struct smc_sock *smc;
1513         int rc = -EPIPE;
1514
1515         smc = smc_sk(sk);
1516         lock_sock(sk);
1517         if ((sk->sk_state != SMC_ACTIVE) &&
1518             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1519             (sk->sk_state != SMC_INIT))
1520                 goto out;
1521
1522         if (msg->msg_flags & MSG_FASTOPEN) {
1523                 if (sk->sk_state == SMC_INIT) {
1524                         smc_switch_to_fallback(smc);
1525                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1526                 } else {
1527                         rc = -EINVAL;
1528                         goto out;
1529                 }
1530         }
1531
1532         if (smc->use_fallback)
1533                 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1534         else
1535                 rc = smc_tx_sendmsg(smc, msg, len);
1536 out:
1537         release_sock(sk);
1538         return rc;
1539 }
1540
1541 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1542                        int flags)
1543 {
1544         struct sock *sk = sock->sk;
1545         struct smc_sock *smc;
1546         int rc = -ENOTCONN;
1547
1548         smc = smc_sk(sk);
1549         lock_sock(sk);
1550         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1551                 /* socket was connected before, no more data to read */
1552                 rc = 0;
1553                 goto out;
1554         }
1555         if ((sk->sk_state == SMC_INIT) ||
1556             (sk->sk_state == SMC_LISTEN) ||
1557             (sk->sk_state == SMC_CLOSED))
1558                 goto out;
1559
1560         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1561                 rc = 0;
1562                 goto out;
1563         }
1564
1565         if (smc->use_fallback) {
1566                 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1567         } else {
1568                 msg->msg_namelen = 0;
1569                 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1570         }
1571
1572 out:
1573         release_sock(sk);
1574         return rc;
1575 }
1576
1577 static __poll_t smc_accept_poll(struct sock *parent)
1578 {
1579         struct smc_sock *isk = smc_sk(parent);
1580         __poll_t mask = 0;
1581
1582         spin_lock(&isk->accept_q_lock);
1583         if (!list_empty(&isk->accept_q))
1584                 mask = EPOLLIN | EPOLLRDNORM;
1585         spin_unlock(&isk->accept_q_lock);
1586
1587         return mask;
1588 }
1589
1590 static __poll_t smc_poll(struct file *file, struct socket *sock,
1591                              poll_table *wait)
1592 {
1593         struct sock *sk = sock->sk;
1594         __poll_t mask = 0;
1595         struct smc_sock *smc;
1596
1597         if (!sk)
1598                 return EPOLLNVAL;
1599
1600         smc = smc_sk(sock->sk);
1601         if (smc->use_fallback) {
1602                 /* delegate to CLC child sock */
1603                 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1604                 sk->sk_err = smc->clcsock->sk->sk_err;
1605                 if (sk->sk_err)
1606                         mask |= EPOLLERR;
1607         } else {
1608                 if (sk->sk_state != SMC_CLOSED)
1609                         sock_poll_wait(file, sock, wait);
1610                 if (sk->sk_err)
1611                         mask |= EPOLLERR;
1612                 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1613                     (sk->sk_state == SMC_CLOSED))
1614                         mask |= EPOLLHUP;
1615                 if (sk->sk_state == SMC_LISTEN) {
1616                         /* woken up by sk_data_ready in smc_listen_work() */
1617                         mask = smc_accept_poll(sk);
1618                 } else {
1619                         if (atomic_read(&smc->conn.sndbuf_space) ||
1620                             sk->sk_shutdown & SEND_SHUTDOWN) {
1621                                 mask |= EPOLLOUT | EPOLLWRNORM;
1622                         } else {
1623                                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1624                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1625                         }
1626                         if (atomic_read(&smc->conn.bytes_to_rcv))
1627                                 mask |= EPOLLIN | EPOLLRDNORM;
1628                         if (sk->sk_shutdown & RCV_SHUTDOWN)
1629                                 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1630                         if (sk->sk_state == SMC_APPCLOSEWAIT1)
1631                                 mask |= EPOLLIN;
1632                         if (smc->conn.urg_state == SMC_URG_VALID)
1633                                 mask |= EPOLLPRI;
1634                 }
1635         }
1636
1637         return mask;
1638 }
1639
1640 static int smc_shutdown(struct socket *sock, int how)
1641 {
1642         struct sock *sk = sock->sk;
1643         struct smc_sock *smc;
1644         int rc = -EINVAL;
1645         int rc1 = 0;
1646
1647         smc = smc_sk(sk);
1648
1649         if ((how < SHUT_RD) || (how > SHUT_RDWR))
1650                 return rc;
1651
1652         lock_sock(sk);
1653
1654         rc = -ENOTCONN;
1655         if ((sk->sk_state != SMC_ACTIVE) &&
1656             (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1657             (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1658             (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1659             (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1660             (sk->sk_state != SMC_APPFINCLOSEWAIT))
1661                 goto out;
1662         if (smc->use_fallback) {
1663                 rc = kernel_sock_shutdown(smc->clcsock, how);
1664                 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1665                 if (sk->sk_shutdown == SHUTDOWN_MASK)
1666                         sk->sk_state = SMC_CLOSED;
1667                 goto out;
1668         }
1669         switch (how) {
1670         case SHUT_RDWR:         /* shutdown in both directions */
1671                 rc = smc_close_active(smc);
1672                 break;
1673         case SHUT_WR:
1674                 rc = smc_close_shutdown_write(smc);
1675                 break;
1676         case SHUT_RD:
1677                 rc = 0;
1678                 /* nothing more to do because peer is not involved */
1679                 break;
1680         }
1681         if (smc->clcsock)
1682                 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1683         /* map sock_shutdown_cmd constants to sk_shutdown value range */
1684         sk->sk_shutdown |= how + 1;
1685
1686 out:
1687         release_sock(sk);
1688         return rc ? rc : rc1;
1689 }
1690
1691 static int smc_setsockopt(struct socket *sock, int level, int optname,
1692                           char __user *optval, unsigned int optlen)
1693 {
1694         struct sock *sk = sock->sk;
1695         struct smc_sock *smc;
1696         int val, rc;
1697
1698         smc = smc_sk(sk);
1699
1700         /* generic setsockopts reaching us here always apply to the
1701          * CLC socket
1702          */
1703         rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1704                                            optval, optlen);
1705         if (smc->clcsock->sk->sk_err) {
1706                 sk->sk_err = smc->clcsock->sk->sk_err;
1707                 sk->sk_error_report(sk);
1708         }
1709         if (rc)
1710                 return rc;
1711
1712         if (optlen < sizeof(int))
1713                 return -EINVAL;
1714         if (get_user(val, (int __user *)optval))
1715                 return -EFAULT;
1716
1717         lock_sock(sk);
1718         switch (optname) {
1719         case TCP_ULP:
1720         case TCP_FASTOPEN:
1721         case TCP_FASTOPEN_CONNECT:
1722         case TCP_FASTOPEN_KEY:
1723         case TCP_FASTOPEN_NO_COOKIE:
1724                 /* option not supported by SMC */
1725                 if (sk->sk_state == SMC_INIT) {
1726                         smc_switch_to_fallback(smc);
1727                         smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1728                 } else {
1729                         if (!smc->use_fallback)
1730                                 rc = -EINVAL;
1731                 }
1732                 break;
1733         case TCP_NODELAY:
1734                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1735                         if (val && !smc->use_fallback)
1736                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1737                                                  0);
1738                 }
1739                 break;
1740         case TCP_CORK:
1741                 if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) {
1742                         if (!val && !smc->use_fallback)
1743                                 mod_delayed_work(system_wq, &smc->conn.tx_work,
1744                                                  0);
1745                 }
1746                 break;
1747         case TCP_DEFER_ACCEPT:
1748                 smc->sockopt_defer_accept = val;
1749                 break;
1750         default:
1751                 break;
1752         }
1753         release_sock(sk);
1754
1755         return rc;
1756 }
1757
1758 static int smc_getsockopt(struct socket *sock, int level, int optname,
1759                           char __user *optval, int __user *optlen)
1760 {
1761         struct smc_sock *smc;
1762
1763         smc = smc_sk(sock->sk);
1764         /* socket options apply to the CLC socket */
1765         return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1766                                              optval, optlen);
1767 }
1768
1769 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1770                      unsigned long arg)
1771 {
1772         union smc_host_cursor cons, urg;
1773         struct smc_connection *conn;
1774         struct smc_sock *smc;
1775         int answ;
1776
1777         smc = smc_sk(sock->sk);
1778         conn = &smc->conn;
1779         lock_sock(&smc->sk);
1780         if (smc->use_fallback) {
1781                 if (!smc->clcsock) {
1782                         release_sock(&smc->sk);
1783                         return -EBADF;
1784                 }
1785                 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1786                 release_sock(&smc->sk);
1787                 return answ;
1788         }
1789         switch (cmd) {
1790         case SIOCINQ: /* same as FIONREAD */
1791                 if (smc->sk.sk_state == SMC_LISTEN) {
1792                         release_sock(&smc->sk);
1793                         return -EINVAL;
1794                 }
1795                 if (smc->sk.sk_state == SMC_INIT ||
1796                     smc->sk.sk_state == SMC_CLOSED)
1797                         answ = 0;
1798                 else
1799                         answ = atomic_read(&smc->conn.bytes_to_rcv);
1800                 break;
1801         case SIOCOUTQ:
1802                 /* output queue size (not send + not acked) */
1803                 if (smc->sk.sk_state == SMC_LISTEN) {
1804                         release_sock(&smc->sk);
1805                         return -EINVAL;
1806                 }
1807                 if (smc->sk.sk_state == SMC_INIT ||
1808                     smc->sk.sk_state == SMC_CLOSED)
1809                         answ = 0;
1810                 else
1811                         answ = smc->conn.sndbuf_desc->len -
1812                                         atomic_read(&smc->conn.sndbuf_space);
1813                 break;
1814         case SIOCOUTQNSD:
1815                 /* output queue size (not send only) */
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                         answ = smc_tx_prepared_sends(&smc->conn);
1825                 break;
1826         case SIOCATMARK:
1827                 if (smc->sk.sk_state == SMC_LISTEN) {
1828                         release_sock(&smc->sk);
1829                         return -EINVAL;
1830                 }
1831                 if (smc->sk.sk_state == SMC_INIT ||
1832                     smc->sk.sk_state == SMC_CLOSED) {
1833                         answ = 0;
1834                 } else {
1835                         smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1836                         smc_curs_copy(&urg, &conn->urg_curs, conn);
1837                         answ = smc_curs_diff(conn->rmb_desc->len,
1838                                              &cons, &urg) == 1;
1839                 }
1840                 break;
1841         default:
1842                 release_sock(&smc->sk);
1843                 return -ENOIOCTLCMD;
1844         }
1845         release_sock(&smc->sk);
1846
1847         return put_user(answ, (int __user *)arg);
1848 }
1849
1850 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1851                             int offset, size_t size, int flags)
1852 {
1853         struct sock *sk = sock->sk;
1854         struct smc_sock *smc;
1855         int rc = -EPIPE;
1856
1857         smc = smc_sk(sk);
1858         lock_sock(sk);
1859         if (sk->sk_state != SMC_ACTIVE) {
1860                 release_sock(sk);
1861                 goto out;
1862         }
1863         release_sock(sk);
1864         if (smc->use_fallback)
1865                 rc = kernel_sendpage(smc->clcsock, page, offset,
1866                                      size, flags);
1867         else
1868                 rc = sock_no_sendpage(sock, page, offset, size, flags);
1869
1870 out:
1871         return rc;
1872 }
1873
1874 /* Map the affected portions of the rmbe into an spd, note the number of bytes
1875  * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
1876  * updates till whenever a respective page has been fully processed.
1877  * Note that subsequent recv() calls have to wait till all splice() processing
1878  * completed.
1879  */
1880 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1881                                struct pipe_inode_info *pipe, size_t len,
1882                                unsigned int flags)
1883 {
1884         struct sock *sk = sock->sk;
1885         struct smc_sock *smc;
1886         int rc = -ENOTCONN;
1887
1888         smc = smc_sk(sk);
1889         lock_sock(sk);
1890         if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1891                 /* socket was connected before, no more data to read */
1892                 rc = 0;
1893                 goto out;
1894         }
1895         if (sk->sk_state == SMC_INIT ||
1896             sk->sk_state == SMC_LISTEN ||
1897             sk->sk_state == SMC_CLOSED)
1898                 goto out;
1899
1900         if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1901                 rc = 0;
1902                 goto out;
1903         }
1904
1905         if (smc->use_fallback) {
1906                 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1907                                                     pipe, len, flags);
1908         } else {
1909                 if (*ppos) {
1910                         rc = -ESPIPE;
1911                         goto out;
1912                 }
1913                 if (flags & SPLICE_F_NONBLOCK)
1914                         flags = MSG_DONTWAIT;
1915                 else
1916                         flags = 0;
1917                 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1918         }
1919 out:
1920         release_sock(sk);
1921
1922         return rc;
1923 }
1924
1925 /* must look like tcp */
1926 static const struct proto_ops smc_sock_ops = {
1927         .family         = PF_SMC,
1928         .owner          = THIS_MODULE,
1929         .release        = smc_release,
1930         .bind           = smc_bind,
1931         .connect        = smc_connect,
1932         .socketpair     = sock_no_socketpair,
1933         .accept         = smc_accept,
1934         .getname        = smc_getname,
1935         .poll           = smc_poll,
1936         .ioctl          = smc_ioctl,
1937         .listen         = smc_listen,
1938         .shutdown       = smc_shutdown,
1939         .setsockopt     = smc_setsockopt,
1940         .getsockopt     = smc_getsockopt,
1941         .sendmsg        = smc_sendmsg,
1942         .recvmsg        = smc_recvmsg,
1943         .mmap           = sock_no_mmap,
1944         .sendpage       = smc_sendpage,
1945         .splice_read    = smc_splice_read,
1946 };
1947
1948 static int smc_create(struct net *net, struct socket *sock, int protocol,
1949                       int kern)
1950 {
1951         int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1952         struct smc_sock *smc;
1953         struct sock *sk;
1954         int rc;
1955
1956         rc = -ESOCKTNOSUPPORT;
1957         if (sock->type != SOCK_STREAM)
1958                 goto out;
1959
1960         rc = -EPROTONOSUPPORT;
1961         if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1962                 goto out;
1963
1964         rc = -ENOBUFS;
1965         sock->ops = &smc_sock_ops;
1966         sk = smc_sock_alloc(net, sock, protocol);
1967         if (!sk)
1968                 goto out;
1969
1970         /* create internal TCP socket for CLC handshake and fallback */
1971         smc = smc_sk(sk);
1972         smc->use_fallback = false; /* assume rdma capability first */
1973         smc->fallback_rsn = 0;
1974         rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1975                               &smc->clcsock);
1976         if (rc) {
1977                 sk_common_release(sk);
1978                 goto out;
1979         }
1980         smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1981         smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1982
1983 out:
1984         return rc;
1985 }
1986
1987 static const struct net_proto_family smc_sock_family_ops = {
1988         .family = PF_SMC,
1989         .owner  = THIS_MODULE,
1990         .create = smc_create,
1991 };
1992
1993 unsigned int smc_net_id;
1994
1995 static __net_init int smc_net_init(struct net *net)
1996 {
1997         return smc_pnet_net_init(net);
1998 }
1999
2000 static void __net_exit smc_net_exit(struct net *net)
2001 {
2002         smc_pnet_net_exit(net);
2003 }
2004
2005 static struct pernet_operations smc_net_ops = {
2006         .init = smc_net_init,
2007         .exit = smc_net_exit,
2008         .id   = &smc_net_id,
2009         .size = sizeof(struct smc_net),
2010 };
2011
2012 static int __init smc_init(void)
2013 {
2014         int rc;
2015
2016         rc = register_pernet_subsys(&smc_net_ops);
2017         if (rc)
2018                 return rc;
2019
2020         rc = smc_pnet_init();
2021         if (rc)
2022                 return rc;
2023
2024         rc = smc_llc_init();
2025         if (rc) {
2026                 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2027                 goto out_pnet;
2028         }
2029
2030         rc = smc_cdc_init();
2031         if (rc) {
2032                 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2033                 goto out_pnet;
2034         }
2035
2036         rc = proto_register(&smc_proto, 1);
2037         if (rc) {
2038                 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2039                 goto out_pnet;
2040         }
2041
2042         rc = proto_register(&smc_proto6, 1);
2043         if (rc) {
2044                 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2045                 goto out_proto;
2046         }
2047
2048         rc = sock_register(&smc_sock_family_ops);
2049         if (rc) {
2050                 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2051                 goto out_proto6;
2052         }
2053         INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2054         INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2055
2056         rc = smc_ib_register_client();
2057         if (rc) {
2058                 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2059                 goto out_sock;
2060         }
2061
2062         static_branch_enable(&tcp_have_smc);
2063         return 0;
2064
2065 out_sock:
2066         sock_unregister(PF_SMC);
2067 out_proto6:
2068         proto_unregister(&smc_proto6);
2069 out_proto:
2070         proto_unregister(&smc_proto);
2071 out_pnet:
2072         smc_pnet_exit();
2073         return rc;
2074 }
2075
2076 static void __exit smc_exit(void)
2077 {
2078         smc_core_exit();
2079         static_branch_disable(&tcp_have_smc);
2080         smc_ib_unregister_client();
2081         sock_unregister(PF_SMC);
2082         proto_unregister(&smc_proto6);
2083         proto_unregister(&smc_proto);
2084         smc_pnet_exit();
2085         unregister_pernet_subsys(&smc_net_ops);
2086 }
2087
2088 module_init(smc_init);
2089 module_exit(smc_exit);
2090
2091 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2092 MODULE_DESCRIPTION("smc socket address family");
2093 MODULE_LICENSE("GPL");
2094 MODULE_ALIAS_NETPROTO(PF_SMC);