net/rds/af_rds.c

   1 /*
   2  * Copyright (c) 2006 Oracle.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33 #include <linux/module.h>
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  36 #include <linux/gfp.h>
  37 #include <linux/in.h>
  38 #include <linux/poll.h>
  39 #include <net/sock.h>
  40
  41 #include "rds.h"
  42
  43 /* this is just used for stats gathering :/ */
  44 static DEFINE_SPINLOCK(rds_sock_lock);
  45 static unsigned long rds_sock_count;
  46 static LIST_HEAD(rds_sock_list);
  47 DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);
  48
  49 /*
  50  * This is called as the final descriptor referencing this socket is closed.
  51  * We have to unbind the socket so that another socket can be bound to the
  52  * address it was using.
  53  *
  54  * We have to be careful about racing with the incoming path.  sock_orphan()
  55  * sets SOCK_DEAD and we use that as an indicator to the rx path that new
  56  * messages shouldn't be queued.
  57  */
  58 static int rds_release(struct socket *sock)
  59 {
  60         struct sock *sk = sock->sk;
  61         struct rds_sock *rs;
  62
  63         if (!sk)
  64                 goto out;
  65
  66         rs = rds_sk_to_rs(sk);
  67
  68         sock_orphan(sk);
  69         /* Note - rds_clear_recv_queue grabs rs_recv_lock, so
  70          * that ensures the recv path has completed messing
  71          * with the socket. */
  72         rds_clear_recv_queue(rs);
  73         rds_cong_remove_socket(rs);
  74
  75         rds_remove_bound(rs);
  76
  77         rds_send_drop_to(rs, NULL);
  78         rds_rdma_drop_keys(rs);
  79         rds_notify_queue_get(rs, NULL);
  80
  81         spin_lock_bh(&rds_sock_lock);
  82         list_del_init(&rs->rs_item);
  83         rds_sock_count--;
  84         spin_unlock_bh(&rds_sock_lock);
  85
  86         rds_trans_put(rs->rs_transport);
  87
  88         sock->sk = NULL;
  89         sock_put(sk);
  90 out:
  91         return 0;
  92 }
  93
  94 /*
  95  * Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
  96  * _bh() isn't OK here, we're called from interrupt handlers.  It's probably OK
  97  * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
  98  * this seems more conservative.
  99  * NB - normally, one would use sk_callback_lock for this, but we can
 100  * get here from interrupts, whereas the network code grabs sk_callback_lock
 101  * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
 102  */
 103 void rds_wake_sk_sleep(struct rds_sock *rs)
 104 {
 105         unsigned long flags;
 106
 107         read_lock_irqsave(&rs->rs_recv_lock, flags);
 108         __rds_wake_sk_sleep(rds_rs_to_sk(rs));
 109         read_unlock_irqrestore(&rs->rs_recv_lock, flags);
 110 }
 111
 112 static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
 113                        int *uaddr_len, int peer)
 114 {
 115         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
 116         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
 117
 118         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 119
 120         /* racey, don't care */
 121         if (peer) {
 122                 if (!rs->rs_conn_addr)
 123                         return -ENOTCONN;
 124
 125                 sin->sin_port = rs->rs_conn_port;
 126                 sin->sin_addr.s_addr = rs->rs_conn_addr;
 127         } else {
 128                 sin->sin_port = rs->rs_bound_port;
 129                 sin->sin_addr.s_addr = rs->rs_bound_addr;
 130         }
 131
 132         sin->sin_family = AF_INET;
 133
 134         *uaddr_len = sizeof(*sin);
 135         return 0;
 136 }
 137
 138 /*
 139  * RDS' poll is without a doubt the least intuitive part of the interface,
 140  * as POLLIN and POLLOUT do not behave entirely as you would expect from
 141  * a network protocol.
 142  *
 143  * POLLIN is asserted if
 144  *  -   there is data on the receive queue.
 145  *  -   to signal that a previously congested destination may have become
 146  *      uncongested
 147  *  -   A notification has been queued to the socket (this can be a congestion
 148  *      update, or a RDMA completion).
 149  *
 150  * POLLOUT is asserted if there is room on the send queue. This does not mean
 151  * however, that the next sendmsg() call will succeed. If the application tries
 152  * to send to a congested destination, the system call may still fail (and
 153  * return ENOBUFS).
 154  */
 155 static unsigned int rds_poll(struct file *file, struct socket *sock,
 156                              poll_table *wait)
 157 {
 158         struct sock *sk = sock->sk;
 159         struct rds_sock *rs = rds_sk_to_rs(sk);
 160         unsigned int mask = 0;
 161         unsigned long flags;
 162
 163         poll_wait(file, sk_sleep(sk), wait);
 164
 165         if (rs->rs_seen_congestion)
 166                 poll_wait(file, &rds_poll_waitq, wait);
 167
 168         read_lock_irqsave(&rs->rs_recv_lock, flags);
 169         if (!rs->rs_cong_monitor) {
 170                 /* When a congestion map was updated, we signal POLLIN for
 171                  * "historical" reasons. Applications can also poll for
 172                  * WRBAND instead. */
 173                 if (rds_cong_updated_since(&rs->rs_cong_track))
 174                         mask |= (POLLIN | POLLRDNORM | POLLWRBAND);
 175         } else {
 176                 spin_lock(&rs->rs_lock);
 177                 if (rs->rs_cong_notify)
 178                         mask |= (POLLIN | POLLRDNORM);
 179                 spin_unlock(&rs->rs_lock);
 180         }
 181         if (!list_empty(&rs->rs_recv_queue) ||
 182             !list_empty(&rs->rs_notify_queue))
 183                 mask |= (POLLIN | POLLRDNORM);
 184         if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
 185                 mask |= (POLLOUT | POLLWRNORM);
 186         read_unlock_irqrestore(&rs->rs_recv_lock, flags);
 187
 188         /* clear state any time we wake a seen-congested socket */
 189         if (mask)
 190                 rs->rs_seen_congestion = 0;
 191
 192         return mask;
 193 }
 194
 195 static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 196 {
 197         return -ENOIOCTLCMD;
 198 }
 199
 200 static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
 201                               int len)
 202 {
 203         struct sockaddr_in sin;
 204         int ret = 0;
 205
 206         /* racing with another thread binding seems ok here */
 207         if (rs->rs_bound_addr == 0) {
 208                 ret = -ENOTCONN; /* XXX not a great errno */
 209                 goto out;
 210         }
 211
 212         if (len < sizeof(struct sockaddr_in)) {
 213                 ret = -EINVAL;
 214                 goto out;
 215         }
 216
 217         if (copy_from_user(&sin, optval, sizeof(sin))) {
 218                 ret = -EFAULT;
 219                 goto out;
 220         }
 221
 222         rds_send_drop_to(rs, &sin);
 223 out:
 224         return ret;
 225 }
 226
 227 static int rds_set_bool_option(unsigned char *optvar, char __user *optval,
 228                                int optlen)
 229 {
 230         int value;
 231
 232         if (optlen < sizeof(int))
 233                 return -EINVAL;
 234         if (get_user(value, (int __user *) optval))
 235                 return -EFAULT;
 236         *optvar = !!value;
 237         return 0;
 238 }
 239
 240 static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
 241                             int optlen)
 242 {
 243         int ret;
 244
 245         ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
 246         if (ret == 0) {
 247                 if (rs->rs_cong_monitor) {
 248                         rds_cong_add_socket(rs);
 249                 } else {
 250                         rds_cong_remove_socket(rs);
 251                         rs->rs_cong_mask = 0;
 252                         rs->rs_cong_notify = 0;
 253                 }
 254         }
 255         return ret;
 256 }
 257
 258 static int rds_set_transport(struct rds_sock *rs, char __user *optval,
 259                              int optlen)
 260 {
 261         int t_type;
 262
 263         if (rs->rs_transport)
 264                 return -EOPNOTSUPP; /* previously attached to transport */
 265
 266         if (optlen != sizeof(int))
 267                 return -EINVAL;
 268
 269         if (copy_from_user(&t_type, (int __user *)optval, sizeof(t_type)))
 270                 return -EFAULT;
 271
 272         if (t_type < 0 || t_type >= RDS_TRANS_COUNT)
 273                 return -EINVAL;
 274
 275         rs->rs_transport = rds_trans_get(t_type);
 276
 277         return rs->rs_transport ? 0 : -ENOPROTOOPT;
 278 }
 279
 280 static int rds_enable_recvtstamp(struct sock *sk, char __user *optval,
 281                                  int optlen)
 282 {
 283         int val, valbool;
 284
 285         if (optlen != sizeof(int))
 286                 return -EFAULT;
 287
 288         if (get_user(val, (int __user *)optval))
 289                 return -EFAULT;
 290
 291         valbool = val ? 1 : 0;
 292
 293         if (valbool)
 294                 sock_set_flag(sk, SOCK_RCVTSTAMP);
 295         else
 296                 sock_reset_flag(sk, SOCK_RCVTSTAMP);
 297
 298         return 0;
 299 }
 300
 301 static int rds_recv_track_latency(struct rds_sock *rs, char __user *optval,
 302                                   int optlen)
 303 {
 304         struct rds_rx_trace_so trace;
 305         int i;
 306
 307         if (optlen != sizeof(struct rds_rx_trace_so))
 308                 return -EFAULT;
 309
 310         if (copy_from_user(&trace, optval, sizeof(trace)))
 311                 return -EFAULT;
 312
 313         if (trace.rx_traces > RDS_MSG_RX_DGRAM_TRACE_MAX)
 314                 return -EFAULT;
 315
 316         rs->rs_rx_traces = trace.rx_traces;
 317         for (i = 0; i < rs->rs_rx_traces; i++) {
 318                 if (trace.rx_trace_pos[i] > RDS_MSG_RX_DGRAM_TRACE_MAX) {
 319                         rs->rs_rx_traces = 0;
 320                         return -EFAULT;
 321                 }
 322                 rs->rs_rx_trace[i] = trace.rx_trace_pos[i];
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int rds_setsockopt(struct socket *sock, int level, int optname,
 329                           char __user *optval, unsigned int optlen)
 330 {
 331         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
 332         int ret;
 333
 334         if (level != SOL_RDS) {
 335                 ret = -ENOPROTOOPT;
 336                 goto out;
 337         }
 338
 339         switch (optname) {
 340         case RDS_CANCEL_SENT_TO:
 341                 ret = rds_cancel_sent_to(rs, optval, optlen);
 342                 break;
 343         case RDS_GET_MR:
 344                 ret = rds_get_mr(rs, optval, optlen);
 345                 break;
 346         case RDS_GET_MR_FOR_DEST:
 347                 ret = rds_get_mr_for_dest(rs, optval, optlen);
 348                 break;
 349         case RDS_FREE_MR:
 350                 ret = rds_free_mr(rs, optval, optlen);
 351                 break;
 352         case RDS_RECVERR:
 353                 ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
 354                 break;
 355         case RDS_CONG_MONITOR:
 356                 ret = rds_cong_monitor(rs, optval, optlen);
 357                 break;
 358         case SO_RDS_TRANSPORT:
 359                 lock_sock(sock->sk);
 360                 ret = rds_set_transport(rs, optval, optlen);
 361                 release_sock(sock->sk);
 362                 break;
 363         case SO_TIMESTAMP:
 364                 lock_sock(sock->sk);
 365                 ret = rds_enable_recvtstamp(sock->sk, optval, optlen);
 366                 release_sock(sock->sk);
 367                 break;
 368         case SO_RDS_MSG_RXPATH_LATENCY:
 369                 ret = rds_recv_track_latency(rs, optval, optlen);
 370                 break;
 371         default:
 372                 ret = -ENOPROTOOPT;
 373         }
 374 out:
 375         return ret;
 376 }
 377
 378 static int rds_getsockopt(struct socket *sock, int level, int optname,
 379                           char __user *optval, int __user *optlen)
 380 {
 381         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
 382         int ret = -ENOPROTOOPT, len;
 383         int trans;
 384
 385         if (level != SOL_RDS)
 386                 goto out;
 387
 388         if (get_user(len, optlen)) {
 389                 ret = -EFAULT;
 390                 goto out;
 391         }
 392
 393         switch (optname) {
 394         case RDS_INFO_FIRST ... RDS_INFO_LAST:
 395                 ret = rds_info_getsockopt(sock, optname, optval,
 396                                           optlen);
 397                 break;
 398
 399         case RDS_RECVERR:
 400                 if (len < sizeof(int))
 401                         ret = -EINVAL;
 402                 else
 403                 if (put_user(rs->rs_recverr, (int __user *) optval) ||
 404                     put_user(sizeof(int), optlen))
 405                         ret = -EFAULT;
 406                 else
 407                         ret = 0;
 408                 break;
 409         case SO_RDS_TRANSPORT:
 410                 if (len < sizeof(int)) {
 411                         ret = -EINVAL;
 412                         break;
 413                 }
 414                 trans = (rs->rs_transport ? rs->rs_transport->t_type :
 415                          RDS_TRANS_NONE); /* unbound */
 416                 if (put_user(trans, (int __user *)optval) ||
 417                     put_user(sizeof(int), optlen))
 418                         ret = -EFAULT;
 419                 else
 420                         ret = 0;
 421                 break;
 422         default:
 423                 break;
 424         }
 425
 426 out:
 427         return ret;
 428
 429 }
 430
 431 static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
 432                        int addr_len, int flags)
 433 {
 434         struct sock *sk = sock->sk;
 435         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
 436         struct rds_sock *rs = rds_sk_to_rs(sk);
 437         int ret = 0;
 438
 439         lock_sock(sk);
 440
 441         if (addr_len != sizeof(struct sockaddr_in)) {
 442                 ret = -EINVAL;
 443                 goto out;
 444         }
 445
 446         if (sin->sin_family != AF_INET) {
 447                 ret = -EAFNOSUPPORT;
 448                 goto out;
 449         }
 450
 451         if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
 452                 ret = -EDESTADDRREQ;
 453                 goto out;
 454         }
 455
 456         rs->rs_conn_addr = sin->sin_addr.s_addr;
 457         rs->rs_conn_port = sin->sin_port;
 458
 459 out:
 460         release_sock(sk);
 461         return ret;
 462 }
 463
 464 static struct proto rds_proto = {
 465         .name     = "RDS",
 466         .owner    = THIS_MODULE,
 467         .obj_size = sizeof(struct rds_sock),
 468 };
 469
 470 static const struct proto_ops rds_proto_ops = {
 471         .family =       AF_RDS,
 472         .owner =        THIS_MODULE,
 473         .release =      rds_release,
 474         .bind =         rds_bind,
 475         .connect =      rds_connect,
 476         .socketpair =   sock_no_socketpair,
 477         .accept =       sock_no_accept,
 478         .getname =      rds_getname,
 479         .poll =         rds_poll,
 480         .ioctl =        rds_ioctl,
 481         .listen =       sock_no_listen,
 482         .shutdown =     sock_no_shutdown,
 483         .setsockopt =   rds_setsockopt,
 484         .getsockopt =   rds_getsockopt,
 485         .sendmsg =      rds_sendmsg,
 486         .recvmsg =      rds_recvmsg,
 487         .mmap =         sock_no_mmap,
 488         .sendpage =     sock_no_sendpage,
 489 };
 490
 491 static void rds_sock_destruct(struct sock *sk)
 492 {
 493         struct rds_sock *rs = rds_sk_to_rs(sk);
 494
 495         WARN_ON((&rs->rs_item != rs->rs_item.next ||
 496                  &rs->rs_item != rs->rs_item.prev));
 497 }
 498
 499 static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
 500 {
 501         struct rds_sock *rs;
 502
 503         sock_init_data(sock, sk);
 504         sock->ops               = &rds_proto_ops;
 505         sk->sk_protocol         = protocol;
 506         sk->sk_destruct         = rds_sock_destruct;
 507
 508         rs = rds_sk_to_rs(sk);
 509         spin_lock_init(&rs->rs_lock);
 510         rwlock_init(&rs->rs_recv_lock);
 511         INIT_LIST_HEAD(&rs->rs_send_queue);
 512         INIT_LIST_HEAD(&rs->rs_recv_queue);
 513         INIT_LIST_HEAD(&rs->rs_notify_queue);
 514         INIT_LIST_HEAD(&rs->rs_cong_list);
 515         spin_lock_init(&rs->rs_rdma_lock);
 516         rs->rs_rdma_keys = RB_ROOT;
 517         rs->rs_rx_traces = 0;
 518
 519         spin_lock_bh(&rds_sock_lock);
 520         list_add_tail(&rs->rs_item, &rds_sock_list);
 521         rds_sock_count++;
 522         spin_unlock_bh(&rds_sock_lock);
 523
 524         return 0;
 525 }
 526
 527 static int rds_create(struct net *net, struct socket *sock, int protocol,
 528                       int kern)
 529 {
 530         struct sock *sk;
 531
 532         if (sock->type != SOCK_SEQPACKET || protocol)
 533                 return -ESOCKTNOSUPPORT;
 534
 535         sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto, kern);
 536         if (!sk)
 537                 return -ENOMEM;
 538
 539         return __rds_create(sock, sk, protocol);
 540 }
 541
 542 void rds_sock_addref(struct rds_sock *rs)
 543 {
 544         sock_hold(rds_rs_to_sk(rs));
 545 }
 546
 547 void rds_sock_put(struct rds_sock *rs)
 548 {
 549         sock_put(rds_rs_to_sk(rs));
 550 }
 551
 552 static const struct net_proto_family rds_family_ops = {
 553         .family =       AF_RDS,
 554         .create =       rds_create,
 555         .owner  =       THIS_MODULE,
 556 };
 557
 558 static void rds_sock_inc_info(struct socket *sock, unsigned int len,
 559                               struct rds_info_iterator *iter,
 560                               struct rds_info_lengths *lens)
 561 {
 562         struct rds_sock *rs;
 563         struct rds_incoming *inc;
 564         unsigned int total = 0;
 565
 566         len /= sizeof(struct rds_info_message);
 567
 568         spin_lock_bh(&rds_sock_lock);
 569
 570         list_for_each_entry(rs, &rds_sock_list, rs_item) {
 571                 read_lock(&rs->rs_recv_lock);
 572
 573                 /* XXX too lazy to maintain counts.. */
 574                 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
 575                         total++;
 576                         if (total <= len)
 577                                 rds_inc_info_copy(inc, iter, inc->i_saddr,
 578                                                   rs->rs_bound_addr, 1);
 579                 }
 580
 581                 read_unlock(&rs->rs_recv_lock);
 582         }
 583
 584         spin_unlock_bh(&rds_sock_lock);
 585
 586         lens->nr = total;
 587         lens->each = sizeof(struct rds_info_message);
 588 }
 589
 590 static void rds_sock_info(struct socket *sock, unsigned int len,
 591                           struct rds_info_iterator *iter,
 592                           struct rds_info_lengths *lens)
 593 {
 594         struct rds_info_socket sinfo;
 595         struct rds_sock *rs;
 596
 597         len /= sizeof(struct rds_info_socket);
 598
 599         spin_lock_bh(&rds_sock_lock);
 600
 601         if (len < rds_sock_count)
 602                 goto out;
 603
 604         list_for_each_entry(rs, &rds_sock_list, rs_item) {
 605                 sinfo.sndbuf = rds_sk_sndbuf(rs);
 606                 sinfo.rcvbuf = rds_sk_rcvbuf(rs);
 607                 sinfo.bound_addr = rs->rs_bound_addr;
 608                 sinfo.connected_addr = rs->rs_conn_addr;
 609                 sinfo.bound_port = rs->rs_bound_port;
 610                 sinfo.connected_port = rs->rs_conn_port;
 611                 sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
 612
 613                 rds_info_copy(iter, &sinfo, sizeof(sinfo));
 614         }
 615
 616 out:
 617         lens->nr = rds_sock_count;
 618         lens->each = sizeof(struct rds_info_socket);
 619
 620         spin_unlock_bh(&rds_sock_lock);
 621 }
 622
 623 static void rds_exit(void)
 624 {
 625         sock_unregister(rds_family_ops.family);
 626         proto_unregister(&rds_proto);
 627         rds_conn_exit();
 628         rds_cong_exit();
 629         rds_sysctl_exit();
 630         rds_threads_exit();
 631         rds_stats_exit();
 632         rds_page_exit();
 633         rds_bind_lock_destroy();
 634         rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
 635         rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
 636 }
 637 module_exit(rds_exit);
 638
 639 u32 rds_gen_num;
 640
 641 static int rds_init(void)
 642 {
 643         int ret;
 644
 645         net_get_random_once(&rds_gen_num, sizeof(rds_gen_num));
 646
 647         ret = rds_bind_lock_init();
 648         if (ret)
 649                 goto out;
 650
 651         ret = rds_conn_init();
 652         if (ret)
 653                 goto out_bind;
 654
 655         ret = rds_threads_init();
 656         if (ret)
 657                 goto out_conn;
 658         ret = rds_sysctl_init();
 659         if (ret)
 660                 goto out_threads;
 661         ret = rds_stats_init();
 662         if (ret)
 663                 goto out_sysctl;
 664         ret = proto_register(&rds_proto, 1);
 665         if (ret)
 666                 goto out_stats;
 667         ret = sock_register(&rds_family_ops);
 668         if (ret)
 669                 goto out_proto;
 670
 671         rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
 672         rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
 673
 674         goto out;
 675
 676 out_proto:
 677         proto_unregister(&rds_proto);
 678 out_stats:
 679         rds_stats_exit();
 680 out_sysctl:
 681         rds_sysctl_exit();
 682 out_threads:
 683         rds_threads_exit();
 684 out_conn:
 685         rds_conn_exit();
 686         rds_cong_exit();
 687         rds_page_exit();
 688 out_bind:
 689         rds_bind_lock_destroy();
 690 out:
 691         return ret;
 692 }
 693 module_init(rds_init);
 694
 695 #define DRV_VERSION     "4.0"
 696 #define DRV_RELDATE     "Feb 12, 2009"
 697
 698 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
 699 MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
 700                    " v" DRV_VERSION " (" DRV_RELDATE ")");
 701 MODULE_VERSION(DRV_VERSION);
 702 MODULE_LICENSE("Dual BSD/GPL");
 703 MODULE_ALIAS_NETPROTO(PF_RDS);