drivers/infiniband/ulp/ipoib/ipoib_main.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include "ipoib.h"
  36
  37 #include <linux/module.h>
  38
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/kernel.h>
  42 #include <linux/vmalloc.h>
  43
  44 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  45
  46 #include <linux/ip.h>
  47 #include <linux/in.h>
  48
  49 #include <linux/jhash.h>
  50 #include <net/arp.h>
  51 #include <net/addrconf.h>
  52 #include <linux/inetdevice.h>
  53 #include <rdma/ib_cache.h>
  54
  55 #define DRV_VERSION "1.0.0"
  56
  57 const char ipoib_driver_version[] = DRV_VERSION;
  58
  59 MODULE_AUTHOR("Roland Dreier");
  60 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  61 MODULE_LICENSE("Dual BSD/GPL");
  62
  63 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  64 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  65
  66 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  67 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  68 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  69 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  70
  71 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  72 int ipoib_debug_level;
  73
  74 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  75 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  76 #endif
  77
  78 struct ipoib_path_iter {
  79         struct net_device *dev;
  80         struct ipoib_path  path;
  81 };
  82
  83 static const u8 ipv4_bcast_addr[] = {
  84         0x00, 0xff, 0xff, 0xff,
  85         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  86         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  87 };
  88
  89 struct workqueue_struct *ipoib_workqueue;
  90
  91 struct ib_sa_client ipoib_sa_client;
  92
  93 static void ipoib_add_one(struct ib_device *device);
  94 static void ipoib_remove_one(struct ib_device *device, void *client_data);
  95 static void ipoib_neigh_reclaim(struct rcu_head *rp);
  96 static struct net_device *ipoib_get_net_dev_by_params(
  97                 struct ib_device *dev, u8 port, u16 pkey,
  98                 const union ib_gid *gid, const struct sockaddr *addr,
  99                 void *client_data);
 100 static int ipoib_set_mac(struct net_device *dev, void *addr);
 101 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
 102                        int cmd);
 103
 104 static struct ib_client ipoib_client = {
 105         .name   = "ipoib",
 106         .add    = ipoib_add_one,
 107         .remove = ipoib_remove_one,
 108         .get_net_dev_by_params = ipoib_get_net_dev_by_params,
 109 };
 110
 111 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 112 static int ipoib_netdev_event(struct notifier_block *this,
 113                               unsigned long event, void *ptr)
 114 {
 115         struct netdev_notifier_info *ni = ptr;
 116         struct net_device *dev = ni->dev;
 117
 118         if (dev->netdev_ops->ndo_open != ipoib_open)
 119                 return NOTIFY_DONE;
 120
 121         switch (event) {
 122         case NETDEV_REGISTER:
 123                 ipoib_create_debug_files(dev);
 124                 break;
 125         case NETDEV_CHANGENAME:
 126                 ipoib_delete_debug_files(dev);
 127                 ipoib_create_debug_files(dev);
 128                 break;
 129         case NETDEV_UNREGISTER:
 130                 ipoib_delete_debug_files(dev);
 131                 break;
 132         }
 133
 134         return NOTIFY_DONE;
 135 }
 136 #endif
 137
 138 int ipoib_open(struct net_device *dev)
 139 {
 140         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 141
 142         ipoib_dbg(priv, "bringing up interface\n");
 143
 144         netif_carrier_off(dev);
 145
 146         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 147
 148         priv->sm_fullmember_sendonly_support = false;
 149
 150         if (ipoib_ib_dev_open(dev)) {
 151                 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 152                         return 0;
 153                 goto err_disable;
 154         }
 155
 156         ipoib_ib_dev_up(dev);
 157
 158         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 159                 struct ipoib_dev_priv *cpriv;
 160
 161                 /* Bring up any child interfaces too */
 162                 down_read(&priv->vlan_rwsem);
 163                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 164                         int flags;
 165
 166                         flags = cpriv->dev->flags;
 167                         if (flags & IFF_UP)
 168                                 continue;
 169
 170                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 171                 }
 172                 up_read(&priv->vlan_rwsem);
 173         }
 174
 175         netif_start_queue(dev);
 176
 177         return 0;
 178
 179 err_disable:
 180         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 181
 182         return -EINVAL;
 183 }
 184
 185 static int ipoib_stop(struct net_device *dev)
 186 {
 187         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 188
 189         ipoib_dbg(priv, "stopping interface\n");
 190
 191         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 192
 193         netif_stop_queue(dev);
 194
 195         ipoib_ib_dev_down(dev);
 196         ipoib_ib_dev_stop(dev);
 197
 198         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 199                 struct ipoib_dev_priv *cpriv;
 200
 201                 /* Bring down any child interfaces too */
 202                 down_read(&priv->vlan_rwsem);
 203                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 204                         int flags;
 205
 206                         flags = cpriv->dev->flags;
 207                         if (!(flags & IFF_UP))
 208                                 continue;
 209
 210                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 211                 }
 212                 up_read(&priv->vlan_rwsem);
 213         }
 214
 215         return 0;
 216 }
 217
 218 static void ipoib_uninit(struct net_device *dev)
 219 {
 220         ipoib_dev_cleanup(dev);
 221 }
 222
 223 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 224 {
 225         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 226
 227         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 228                 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 229
 230         return features;
 231 }
 232
 233 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 234 {
 235         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 236         int ret = 0;
 237
 238         /* dev->mtu > 2K ==> connected mode */
 239         if (ipoib_cm_admin_enabled(dev)) {
 240                 if (new_mtu > ipoib_cm_max_mtu(dev))
 241                         return -EINVAL;
 242
 243                 if (new_mtu > priv->mcast_mtu)
 244                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 245                                    priv->mcast_mtu);
 246
 247                 dev->mtu = new_mtu;
 248                 return 0;
 249         }
 250
 251         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 252                 return -EINVAL;
 253
 254         priv->admin_mtu = new_mtu;
 255
 256         if (priv->mcast_mtu < priv->admin_mtu)
 257                 ipoib_dbg(priv, "MTU must be smaller than the underlying "
 258                                 "link layer MTU - 4 (%u)\n", priv->mcast_mtu);
 259
 260         new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
 261
 262         if (priv->rn_ops->ndo_change_mtu) {
 263                 bool carrier_status = netif_carrier_ok(dev);
 264
 265                 netif_carrier_off(dev);
 266
 267                 /* notify lower level on the real mtu */
 268                 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
 269
 270                 if (carrier_status)
 271                         netif_carrier_on(dev);
 272         } else {
 273                 dev->mtu = new_mtu;
 274         }
 275
 276         return ret;
 277 }
 278
 279 static void ipoib_get_stats(struct net_device *dev,
 280                             struct rtnl_link_stats64 *stats)
 281 {
 282         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 283
 284         if (priv->rn_ops->ndo_get_stats64)
 285                 priv->rn_ops->ndo_get_stats64(dev, stats);
 286         else
 287                 netdev_stats_to_stats64(stats, &dev->stats);
 288 }
 289
 290 /* Called with an RCU read lock taken */
 291 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
 292                                         struct net_device *dev)
 293 {
 294         struct net *net = dev_net(dev);
 295         struct in_device *in_dev;
 296         struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
 297         struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
 298         __be32 ret_addr;
 299
 300         switch (addr->sa_family) {
 301         case AF_INET:
 302                 in_dev = in_dev_get(dev);
 303                 if (!in_dev)
 304                         return false;
 305
 306                 ret_addr = inet_confirm_addr(net, in_dev, 0,
 307                                              addr_in->sin_addr.s_addr,
 308                                              RT_SCOPE_HOST);
 309                 in_dev_put(in_dev);
 310                 if (ret_addr)
 311                         return true;
 312
 313                 break;
 314         case AF_INET6:
 315                 if (IS_ENABLED(CONFIG_IPV6) &&
 316                     ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
 317                         return true;
 318
 319                 break;
 320         }
 321         return false;
 322 }
 323
 324 /**
 325  * Find the master net_device on top of the given net_device.
 326  * @dev: base IPoIB net_device
 327  *
 328  * Returns the master net_device with a reference held, or the same net_device
 329  * if no master exists.
 330  */
 331 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
 332 {
 333         struct net_device *master;
 334
 335         rcu_read_lock();
 336         master = netdev_master_upper_dev_get_rcu(dev);
 337         if (master)
 338                 dev_hold(master);
 339         rcu_read_unlock();
 340
 341         if (master)
 342                 return master;
 343
 344         dev_hold(dev);
 345         return dev;
 346 }
 347
 348 struct ipoib_walk_data {
 349         const struct sockaddr *addr;
 350         struct net_device *result;
 351 };
 352
 353 static int ipoib_upper_walk(struct net_device *upper, void *_data)
 354 {
 355         struct ipoib_walk_data *data = _data;
 356         int ret = 0;
 357
 358         if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
 359                 dev_hold(upper);
 360                 data->result = upper;
 361                 ret = 1;
 362         }
 363
 364         return ret;
 365 }
 366
 367 /**
 368  * Find a net_device matching the given address, which is an upper device of
 369  * the given net_device.
 370  * @addr: IP address to look for.
 371  * @dev: base IPoIB net_device
 372  *
 373  * If found, returns the net_device with a reference held. Otherwise return
 374  * NULL.
 375  */
 376 static struct net_device *ipoib_get_net_dev_match_addr(
 377                 const struct sockaddr *addr, struct net_device *dev)
 378 {
 379         struct ipoib_walk_data data = {
 380                 .addr = addr,
 381         };
 382
 383         rcu_read_lock();
 384         if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
 385                 dev_hold(dev);
 386                 data.result = dev;
 387                 goto out;
 388         }
 389
 390         netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
 391 out:
 392         rcu_read_unlock();
 393         return data.result;
 394 }
 395
 396 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
 397  * pkey_index and address, if one exists.
 398  *
 399  * @found_net_dev: contains a matching net_device if the return value >= 1,
 400  * with a reference held. */
 401 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
 402                                      const union ib_gid *gid,
 403                                      u16 pkey_index,
 404                                      const struct sockaddr *addr,
 405                                      int nesting,
 406                                      struct net_device **found_net_dev)
 407 {
 408         struct ipoib_dev_priv *child_priv;
 409         struct net_device *net_dev = NULL;
 410         int matches = 0;
 411
 412         if (priv->pkey_index == pkey_index &&
 413             (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
 414                 if (!addr) {
 415                         net_dev = ipoib_get_master_net_dev(priv->dev);
 416                 } else {
 417                         /* Verify the net_device matches the IP address, as
 418                          * IPoIB child devices currently share a GID. */
 419                         net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
 420                 }
 421                 if (net_dev) {
 422                         if (!*found_net_dev)
 423                                 *found_net_dev = net_dev;
 424                         else
 425                                 dev_put(net_dev);
 426                         ++matches;
 427                 }
 428         }
 429
 430         /* Check child interfaces */
 431         down_read_nested(&priv->vlan_rwsem, nesting);
 432         list_for_each_entry(child_priv, &priv->child_intfs, list) {
 433                 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
 434                                                     pkey_index, addr,
 435                                                     nesting + 1,
 436                                                     found_net_dev);
 437                 if (matches > 1)
 438                         break;
 439         }
 440         up_read(&priv->vlan_rwsem);
 441
 442         return matches;
 443 }
 444
 445 /* Returns the number of matching net_devs found (between 0 and 2). Also
 446  * return the matching net_device in the @net_dev parameter, holding a
 447  * reference to the net_device, if the number of matches >= 1 */
 448 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
 449                                          u16 pkey_index,
 450                                          const union ib_gid *gid,
 451                                          const struct sockaddr *addr,
 452                                          struct net_device **net_dev)
 453 {
 454         struct ipoib_dev_priv *priv;
 455         int matches = 0;
 456
 457         *net_dev = NULL;
 458
 459         list_for_each_entry(priv, dev_list, list) {
 460                 if (priv->port != port)
 461                         continue;
 462
 463                 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
 464                                                      addr, 0, net_dev);
 465                 if (matches > 1)
 466                         break;
 467         }
 468
 469         return matches;
 470 }
 471
 472 static struct net_device *ipoib_get_net_dev_by_params(
 473                 struct ib_device *dev, u8 port, u16 pkey,
 474                 const union ib_gid *gid, const struct sockaddr *addr,
 475                 void *client_data)
 476 {
 477         struct net_device *net_dev;
 478         struct list_head *dev_list = client_data;
 479         u16 pkey_index;
 480         int matches;
 481         int ret;
 482
 483         if (!rdma_protocol_ib(dev, port))
 484                 return NULL;
 485
 486         ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
 487         if (ret)
 488                 return NULL;
 489
 490         if (!dev_list)
 491                 return NULL;
 492
 493         /* See if we can find a unique device matching the L2 parameters */
 494         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 495                                                 gid, NULL, &net_dev);
 496
 497         switch (matches) {
 498         case 0:
 499                 return NULL;
 500         case 1:
 501                 return net_dev;
 502         }
 503
 504         dev_put(net_dev);
 505
 506         /* Couldn't find a unique device with L2 parameters only. Use L3
 507          * address to uniquely match the net device */
 508         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 509                                                 gid, addr, &net_dev);
 510         switch (matches) {
 511         case 0:
 512                 return NULL;
 513         default:
 514                 dev_warn_ratelimited(&dev->dev,
 515                                      "duplicate IP address detected\n");
 516                 /* Fall through */
 517         case 1:
 518                 return net_dev;
 519         }
 520 }
 521
 522 int ipoib_set_mode(struct net_device *dev, const char *buf)
 523 {
 524         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 525
 526         if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
 527              !strcmp(buf, "connected\n")) ||
 528              (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
 529              !strcmp(buf, "datagram\n"))) {
 530                 return 0;
 531         }
 532
 533         /* flush paths if we switch modes so that connections are restarted */
 534         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
 535                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 536                 ipoib_warn(priv, "enabling connected mode "
 537                            "will cause multicast packet drops\n");
 538                 netdev_update_features(dev);
 539                 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
 540                 rtnl_unlock();
 541                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 542
 543                 ipoib_flush_paths(dev);
 544                 return (!rtnl_trylock()) ? -EBUSY : 0;
 545         }
 546
 547         if (!strcmp(buf, "datagram\n")) {
 548                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 549                 netdev_update_features(dev);
 550                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 551                 rtnl_unlock();
 552                 ipoib_flush_paths(dev);
 553                 return (!rtnl_trylock()) ? -EBUSY : 0;
 554         }
 555
 556         return -EINVAL;
 557 }
 558
 559 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 560 {
 561         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 562         struct rb_node *n = priv->path_tree.rb_node;
 563         struct ipoib_path *path;
 564         int ret;
 565
 566         while (n) {
 567                 path = rb_entry(n, struct ipoib_path, rb_node);
 568
 569                 ret = memcmp(gid, path->pathrec.dgid.raw,
 570                              sizeof (union ib_gid));
 571
 572                 if (ret < 0)
 573                         n = n->rb_left;
 574                 else if (ret > 0)
 575                         n = n->rb_right;
 576                 else
 577                         return path;
 578         }
 579
 580         return NULL;
 581 }
 582
 583 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 584 {
 585         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 586         struct rb_node **n = &priv->path_tree.rb_node;
 587         struct rb_node *pn = NULL;
 588         struct ipoib_path *tpath;
 589         int ret;
 590
 591         while (*n) {
 592                 pn = *n;
 593                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 594
 595                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 596                              sizeof (union ib_gid));
 597                 if (ret < 0)
 598                         n = &pn->rb_left;
 599                 else if (ret > 0)
 600                         n = &pn->rb_right;
 601                 else
 602                         return -EEXIST;
 603         }
 604
 605         rb_link_node(&path->rb_node, pn, n);
 606         rb_insert_color(&path->rb_node, &priv->path_tree);
 607
 608         list_add_tail(&path->list, &priv->path_list);
 609
 610         return 0;
 611 }
 612
 613 static void path_free(struct net_device *dev, struct ipoib_path *path)
 614 {
 615         struct sk_buff *skb;
 616
 617         while ((skb = __skb_dequeue(&path->queue)))
 618                 dev_kfree_skb_irq(skb);
 619
 620         ipoib_dbg(ipoib_priv(dev), "path_free\n");
 621
 622         /* remove all neigh connected to this path */
 623         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 624
 625         if (path->ah)
 626                 ipoib_put_ah(path->ah);
 627
 628         kfree(path);
 629 }
 630
 631 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 632
 633 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 634 {
 635         struct ipoib_path_iter *iter;
 636
 637         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 638         if (!iter)
 639                 return NULL;
 640
 641         iter->dev = dev;
 642         memset(iter->path.pathrec.dgid.raw, 0, 16);
 643
 644         if (ipoib_path_iter_next(iter)) {
 645                 kfree(iter);
 646                 return NULL;
 647         }
 648
 649         return iter;
 650 }
 651
 652 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 653 {
 654         struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
 655         struct rb_node *n;
 656         struct ipoib_path *path;
 657         int ret = 1;
 658
 659         spin_lock_irq(&priv->lock);
 660
 661         n = rb_first(&priv->path_tree);
 662
 663         while (n) {
 664                 path = rb_entry(n, struct ipoib_path, rb_node);
 665
 666                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 667                            sizeof (union ib_gid)) < 0) {
 668                         iter->path = *path;
 669                         ret = 0;
 670                         break;
 671                 }
 672
 673                 n = rb_next(n);
 674         }
 675
 676         spin_unlock_irq(&priv->lock);
 677
 678         return ret;
 679 }
 680
 681 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 682                           struct ipoib_path *path)
 683 {
 684         *path = iter->path;
 685 }
 686
 687 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 688
 689 void ipoib_mark_paths_invalid(struct net_device *dev)
 690 {
 691         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 692         struct ipoib_path *path, *tp;
 693
 694         spin_lock_irq(&priv->lock);
 695
 696         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 697                 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
 698                           be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
 699                           path->pathrec.dgid.raw);
 700                 if (path->ah)
 701                         path->ah->valid = 0;
 702         }
 703
 704         spin_unlock_irq(&priv->lock);
 705 }
 706
 707 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
 708 {
 709         struct ipoib_pseudo_header *phdr;
 710
 711         phdr = skb_push(skb, sizeof(*phdr));
 712         memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 713 }
 714
 715 void ipoib_flush_paths(struct net_device *dev)
 716 {
 717         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 718         struct ipoib_path *path, *tp;
 719         LIST_HEAD(remove_list);
 720         unsigned long flags;
 721
 722         netif_tx_lock_bh(dev);
 723         spin_lock_irqsave(&priv->lock, flags);
 724
 725         list_splice_init(&priv->path_list, &remove_list);
 726
 727         list_for_each_entry(path, &remove_list, list)
 728                 rb_erase(&path->rb_node, &priv->path_tree);
 729
 730         list_for_each_entry_safe(path, tp, &remove_list, list) {
 731                 if (path->query)
 732                         ib_sa_cancel_query(path->query_id, path->query);
 733                 spin_unlock_irqrestore(&priv->lock, flags);
 734                 netif_tx_unlock_bh(dev);
 735                 wait_for_completion(&path->done);
 736                 path_free(dev, path);
 737                 netif_tx_lock_bh(dev);
 738                 spin_lock_irqsave(&priv->lock, flags);
 739         }
 740
 741         spin_unlock_irqrestore(&priv->lock, flags);
 742         netif_tx_unlock_bh(dev);
 743 }
 744
 745 static void path_rec_completion(int status,
 746                                 struct sa_path_rec *pathrec,
 747                                 void *path_ptr)
 748 {
 749         struct ipoib_path *path = path_ptr;
 750         struct net_device *dev = path->dev;
 751         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 752         struct ipoib_ah *ah = NULL;
 753         struct ipoib_ah *old_ah = NULL;
 754         struct ipoib_neigh *neigh, *tn;
 755         struct sk_buff_head skqueue;
 756         struct sk_buff *skb;
 757         unsigned long flags;
 758
 759         if (!status)
 760                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 761                           be32_to_cpu(sa_path_get_dlid(pathrec)),
 762                           pathrec->dgid.raw);
 763         else
 764                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 765                           status, path->pathrec.dgid.raw);
 766
 767         skb_queue_head_init(&skqueue);
 768
 769         if (!status) {
 770                 struct rdma_ah_attr av;
 771
 772                 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
 773                                                pathrec, &av, NULL)) {
 774                         ah = ipoib_create_ah(dev, priv->pd, &av);
 775                         rdma_destroy_ah_attr(&av);
 776                 }
 777         }
 778
 779         spin_lock_irqsave(&priv->lock, flags);
 780
 781         if (!IS_ERR_OR_NULL(ah)) {
 782                 /*
 783                  * pathrec.dgid is used as the database key from the LLADDR,
 784                  * it must remain unchanged even if the SA returns a different
 785                  * GID to use in the AH.
 786                  */
 787                 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
 788                            sizeof(union ib_gid))) {
 789                         ipoib_dbg(
 790                                 priv,
 791                                 "%s got PathRec for gid %pI6 while asked for %pI6\n",
 792                                 dev->name, pathrec->dgid.raw,
 793                                 path->pathrec.dgid.raw);
 794                         memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
 795                                sizeof(union ib_gid));
 796                 }
 797
 798                 path->pathrec = *pathrec;
 799
 800                 old_ah   = path->ah;
 801                 path->ah = ah;
 802
 803                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 804                           ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
 805                           pathrec->sl);
 806
 807                 while ((skb = __skb_dequeue(&path->queue)))
 808                         __skb_queue_tail(&skqueue, skb);
 809
 810                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 811                         if (neigh->ah) {
 812                                 WARN_ON(neigh->ah != old_ah);
 813                                 /*
 814                                  * Dropping the ah reference inside
 815                                  * priv->lock is safe here, because we
 816                                  * will hold one more reference from
 817                                  * the original value of path->ah (ie
 818                                  * old_ah).
 819                                  */
 820                                 ipoib_put_ah(neigh->ah);
 821                         }
 822                         kref_get(&path->ah->ref);
 823                         neigh->ah = path->ah;
 824
 825                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 826                                 if (!ipoib_cm_get(neigh))
 827                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 828                                                                                path,
 829                                                                                neigh));
 830                                 if (!ipoib_cm_get(neigh)) {
 831                                         ipoib_neigh_free(neigh);
 832                                         continue;
 833                                 }
 834                         }
 835
 836                         while ((skb = __skb_dequeue(&neigh->queue)))
 837                                 __skb_queue_tail(&skqueue, skb);
 838                 }
 839                 path->ah->valid = 1;
 840         }
 841
 842         path->query = NULL;
 843         complete(&path->done);
 844
 845         spin_unlock_irqrestore(&priv->lock, flags);
 846
 847         if (IS_ERR_OR_NULL(ah))
 848                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 849
 850         if (old_ah)
 851                 ipoib_put_ah(old_ah);
 852
 853         while ((skb = __skb_dequeue(&skqueue))) {
 854                 int ret;
 855                 skb->dev = dev;
 856                 ret = dev_queue_xmit(skb);
 857                 if (ret)
 858                         ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
 859                                    __func__, ret);
 860         }
 861 }
 862
 863 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
 864                           void *gid)
 865 {
 866         path->dev = priv->dev;
 867
 868         if (rdma_cap_opa_ah(priv->ca, priv->port))
 869                 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
 870         else
 871                 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
 872
 873         memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
 874         path->pathrec.sgid          = priv->local_gid;
 875         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 876         path->pathrec.numb_path     = 1;
 877         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 878 }
 879
 880 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 881 {
 882         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 883         struct ipoib_path *path;
 884
 885         if (!priv->broadcast)
 886                 return NULL;
 887
 888         path = kzalloc(sizeof *path, GFP_ATOMIC);
 889         if (!path)
 890                 return NULL;
 891
 892         skb_queue_head_init(&path->queue);
 893
 894         INIT_LIST_HEAD(&path->neigh_list);
 895
 896         init_path_rec(priv, path, gid);
 897
 898         return path;
 899 }
 900
 901 static int path_rec_start(struct net_device *dev,
 902                           struct ipoib_path *path)
 903 {
 904         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 905
 906         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 907                   path->pathrec.dgid.raw);
 908
 909         init_completion(&path->done);
 910
 911         path->query_id =
 912                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 913                                    &path->pathrec,
 914                                    IB_SA_PATH_REC_DGID          |
 915                                    IB_SA_PATH_REC_SGID          |
 916                                    IB_SA_PATH_REC_NUMB_PATH     |
 917                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 918                                    IB_SA_PATH_REC_PKEY,
 919                                    1000, GFP_ATOMIC,
 920                                    path_rec_completion,
 921                                    path, &path->query);
 922         if (path->query_id < 0) {
 923                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 924                 path->query = NULL;
 925                 complete(&path->done);
 926                 return path->query_id;
 927         }
 928
 929         return 0;
 930 }
 931
 932 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
 933                                struct net_device *dev)
 934 {
 935         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 936         struct ipoib_path *path;
 937         unsigned long flags;
 938
 939         spin_lock_irqsave(&priv->lock, flags);
 940
 941         path = __path_find(dev, daddr + 4);
 942         if (!path)
 943                 goto out;
 944         if (!path->query)
 945                 path_rec_start(dev, path);
 946 out:
 947         spin_unlock_irqrestore(&priv->lock, flags);
 948 }
 949
 950 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
 951                                           struct net_device *dev)
 952 {
 953         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 954         struct rdma_netdev *rn = netdev_priv(dev);
 955         struct ipoib_path *path;
 956         struct ipoib_neigh *neigh;
 957         unsigned long flags;
 958
 959         spin_lock_irqsave(&priv->lock, flags);
 960         neigh = ipoib_neigh_alloc(daddr, dev);
 961         if (!neigh) {
 962                 spin_unlock_irqrestore(&priv->lock, flags);
 963                 ++dev->stats.tx_dropped;
 964                 dev_kfree_skb_any(skb);
 965                 return NULL;
 966         }
 967
 968         /* To avoid race condition, make sure that the
 969          * neigh will be added only once.
 970          */
 971         if (unlikely(!list_empty(&neigh->list))) {
 972                 spin_unlock_irqrestore(&priv->lock, flags);
 973                 return neigh;
 974         }
 975
 976         path = __path_find(dev, daddr + 4);
 977         if (!path) {
 978                 path = path_rec_create(dev, daddr + 4);
 979                 if (!path)
 980                         goto err_path;
 981
 982                 __path_add(dev, path);
 983         }
 984
 985         list_add_tail(&neigh->list, &path->neigh_list);
 986
 987         if (path->ah && path->ah->valid) {
 988                 kref_get(&path->ah->ref);
 989                 neigh->ah = path->ah;
 990
 991                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 992                         if (!ipoib_cm_get(neigh))
 993                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 994                         if (!ipoib_cm_get(neigh)) {
 995                                 ipoib_neigh_free(neigh);
 996                                 goto err_drop;
 997                         }
 998                         if (skb_queue_len(&neigh->queue) <
 999                             IPOIB_MAX_PATH_REC_QUEUE) {
1000                                 push_pseudo_header(skb, neigh->daddr);
1001                                 __skb_queue_tail(&neigh->queue, skb);
1002                         } else {
1003                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
1004                                            skb_queue_len(&neigh->queue));
1005                                 goto err_drop;
1006                         }
1007                 } else {
1008                         spin_unlock_irqrestore(&priv->lock, flags);
1009                         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1010                                                        IPOIB_QPN(daddr));
1011                         ipoib_neigh_put(neigh);
1012                         return NULL;
1013                 }
1014         } else {
1015                 neigh->ah  = NULL;
1016
1017                 if (!path->query && path_rec_start(dev, path))
1018                         goto err_path;
1019                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1020                         push_pseudo_header(skb, neigh->daddr);
1021                         __skb_queue_tail(&neigh->queue, skb);
1022                 } else {
1023                         goto err_drop;
1024                 }
1025         }
1026
1027         spin_unlock_irqrestore(&priv->lock, flags);
1028         ipoib_neigh_put(neigh);
1029         return NULL;
1030
1031 err_path:
1032         ipoib_neigh_free(neigh);
1033 err_drop:
1034         ++dev->stats.tx_dropped;
1035         dev_kfree_skb_any(skb);
1036
1037         spin_unlock_irqrestore(&priv->lock, flags);
1038         ipoib_neigh_put(neigh);
1039
1040         return NULL;
1041 }
1042
1043 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1044                              struct ipoib_pseudo_header *phdr)
1045 {
1046         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1047         struct rdma_netdev *rn = netdev_priv(dev);
1048         struct ipoib_path *path;
1049         unsigned long flags;
1050
1051         spin_lock_irqsave(&priv->lock, flags);
1052
1053         /* no broadcast means that all paths are (going to be) not valid */
1054         if (!priv->broadcast)
1055                 goto drop_and_unlock;
1056
1057         path = __path_find(dev, phdr->hwaddr + 4);
1058         if (!path || !path->ah || !path->ah->valid) {
1059                 if (!path) {
1060                         path = path_rec_create(dev, phdr->hwaddr + 4);
1061                         if (!path)
1062                                 goto drop_and_unlock;
1063                         __path_add(dev, path);
1064                 } else {
1065                         /*
1066                          * make sure there are no changes in the existing
1067                          * path record
1068                          */
1069                         init_path_rec(priv, path, phdr->hwaddr + 4);
1070                 }
1071                 if (!path->query && path_rec_start(dev, path)) {
1072                         goto drop_and_unlock;
1073                 }
1074
1075                 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1076                         push_pseudo_header(skb, phdr->hwaddr);
1077                         __skb_queue_tail(&path->queue, skb);
1078                         goto unlock;
1079                 } else {
1080                         goto drop_and_unlock;
1081                 }
1082         }
1083
1084         spin_unlock_irqrestore(&priv->lock, flags);
1085         ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1086                   be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1087         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1088                                        IPOIB_QPN(phdr->hwaddr));
1089         return;
1090
1091 drop_and_unlock:
1092         ++dev->stats.tx_dropped;
1093         dev_kfree_skb_any(skb);
1094 unlock:
1095         spin_unlock_irqrestore(&priv->lock, flags);
1096 }
1097
1098 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1099 {
1100         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1101         struct rdma_netdev *rn = netdev_priv(dev);
1102         struct ipoib_neigh *neigh;
1103         struct ipoib_pseudo_header *phdr;
1104         struct ipoib_header *header;
1105         unsigned long flags;
1106
1107         phdr = (struct ipoib_pseudo_header *) skb->data;
1108         skb_pull(skb, sizeof(*phdr));
1109         header = (struct ipoib_header *) skb->data;
1110
1111         if (unlikely(phdr->hwaddr[4] == 0xff)) {
1112                 /* multicast, arrange "if" according to probability */
1113                 if ((header->proto != htons(ETH_P_IP)) &&
1114                     (header->proto != htons(ETH_P_IPV6)) &&
1115                     (header->proto != htons(ETH_P_ARP)) &&
1116                     (header->proto != htons(ETH_P_RARP)) &&
1117                     (header->proto != htons(ETH_P_TIPC))) {
1118                         /* ethertype not supported by IPoIB */
1119                         ++dev->stats.tx_dropped;
1120                         dev_kfree_skb_any(skb);
1121                         return NETDEV_TX_OK;
1122                 }
1123                 /* Add in the P_Key for multicast*/
1124                 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1125                 phdr->hwaddr[9] = priv->pkey & 0xff;
1126
1127                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1128                 if (likely(neigh))
1129                         goto send_using_neigh;
1130                 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1131                 return NETDEV_TX_OK;
1132         }
1133
1134         /* unicast, arrange "switch" according to probability */
1135         switch (header->proto) {
1136         case htons(ETH_P_IP):
1137         case htons(ETH_P_IPV6):
1138         case htons(ETH_P_TIPC):
1139                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1140                 if (unlikely(!neigh)) {
1141                         neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1142                         if (likely(!neigh))
1143                                 return NETDEV_TX_OK;
1144                 }
1145                 break;
1146         case htons(ETH_P_ARP):
1147         case htons(ETH_P_RARP):
1148                 /* for unicast ARP and RARP should always perform path find */
1149                 unicast_arp_send(skb, dev, phdr);
1150                 return NETDEV_TX_OK;
1151         default:
1152                 /* ethertype not supported by IPoIB */
1153                 ++dev->stats.tx_dropped;
1154                 dev_kfree_skb_any(skb);
1155                 return NETDEV_TX_OK;
1156         }
1157
1158 send_using_neigh:
1159         /* note we now hold a ref to neigh */
1160         if (ipoib_cm_get(neigh)) {
1161                 if (ipoib_cm_up(neigh)) {
1162                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1163                         goto unref;
1164                 }
1165         } else if (neigh->ah && neigh->ah->valid) {
1166                 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1167                                                 IPOIB_QPN(phdr->hwaddr));
1168                 goto unref;
1169         } else if (neigh->ah) {
1170                 neigh_refresh_path(neigh, phdr->hwaddr, dev);
1171         }
1172
1173         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1174                 push_pseudo_header(skb, phdr->hwaddr);
1175                 spin_lock_irqsave(&priv->lock, flags);
1176                 __skb_queue_tail(&neigh->queue, skb);
1177                 spin_unlock_irqrestore(&priv->lock, flags);
1178         } else {
1179                 ++dev->stats.tx_dropped;
1180                 dev_kfree_skb_any(skb);
1181         }
1182
1183 unref:
1184         ipoib_neigh_put(neigh);
1185
1186         return NETDEV_TX_OK;
1187 }
1188
1189 static void ipoib_timeout(struct net_device *dev)
1190 {
1191         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1192
1193         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1194                    jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1195         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1196                    netif_queue_stopped(dev),
1197                    priv->tx_head, priv->tx_tail);
1198         /* XXX reset QP, etc. */
1199 }
1200
1201 static int ipoib_hard_header(struct sk_buff *skb,
1202                              struct net_device *dev,
1203                              unsigned short type,
1204                              const void *daddr, const void *saddr, unsigned len)
1205 {
1206         struct ipoib_header *header;
1207
1208         header = skb_push(skb, sizeof *header);
1209
1210         header->proto = htons(type);
1211         header->reserved = 0;
1212
1213         /*
1214          * we don't rely on dst_entry structure,  always stuff the
1215          * destination address into skb hard header so we can figure out where
1216          * to send the packet later.
1217          */
1218         push_pseudo_header(skb, daddr);
1219
1220         return IPOIB_HARD_LEN;
1221 }
1222
1223 static void ipoib_set_mcast_list(struct net_device *dev)
1224 {
1225         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1226
1227         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1228                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1229                 return;
1230         }
1231
1232         queue_work(priv->wq, &priv->restart_task);
1233 }
1234
1235 static int ipoib_get_iflink(const struct net_device *dev)
1236 {
1237         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1238
1239         /* parent interface */
1240         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1241                 return dev->ifindex;
1242
1243         /* child/vlan interface */
1244         return priv->parent->ifindex;
1245 }
1246
1247 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1248 {
1249         /*
1250          * Use only the address parts that contributes to spreading
1251          * The subnet prefix is not used as one can not connect to
1252          * same remote port (GUID) using the same remote QPN via two
1253          * different subnets.
1254          */
1255          /* qpn octets[1:4) & port GUID octets[12:20) */
1256         u32 *d32 = (u32 *) daddr;
1257         u32 hv;
1258
1259         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1260         return hv & htbl->mask;
1261 }
1262
1263 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1264 {
1265         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1266         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1267         struct ipoib_neigh_hash *htbl;
1268         struct ipoib_neigh *neigh = NULL;
1269         u32 hash_val;
1270
1271         rcu_read_lock_bh();
1272
1273         htbl = rcu_dereference_bh(ntbl->htbl);
1274
1275         if (!htbl)
1276                 goto out_unlock;
1277
1278         hash_val = ipoib_addr_hash(htbl, daddr);
1279         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1280              neigh != NULL;
1281              neigh = rcu_dereference_bh(neigh->hnext)) {
1282                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1283                         /* found, take one ref on behalf of the caller */
1284                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1285                                 /* deleted */
1286                                 neigh = NULL;
1287                                 goto out_unlock;
1288                         }
1289
1290                         if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1291                                 neigh->alive = jiffies;
1292                         goto out_unlock;
1293                 }
1294         }
1295
1296 out_unlock:
1297         rcu_read_unlock_bh();
1298         return neigh;
1299 }
1300
1301 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1302 {
1303         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1304         struct ipoib_neigh_hash *htbl;
1305         unsigned long neigh_obsolete;
1306         unsigned long dt;
1307         unsigned long flags;
1308         int i;
1309         LIST_HEAD(remove_list);
1310
1311         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1312                 return;
1313
1314         spin_lock_irqsave(&priv->lock, flags);
1315
1316         htbl = rcu_dereference_protected(ntbl->htbl,
1317                                          lockdep_is_held(&priv->lock));
1318
1319         if (!htbl)
1320                 goto out_unlock;
1321
1322         /* neigh is obsolete if it was idle for two GC periods */
1323         dt = 2 * arp_tbl.gc_interval;
1324         neigh_obsolete = jiffies - dt;
1325         /* handle possible race condition */
1326         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1327                 goto out_unlock;
1328
1329         for (i = 0; i < htbl->size; i++) {
1330                 struct ipoib_neigh *neigh;
1331                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1332
1333                 while ((neigh = rcu_dereference_protected(*np,
1334                                                           lockdep_is_held(&priv->lock))) != NULL) {
1335                         /* was the neigh idle for two GC periods */
1336                         if (time_after(neigh_obsolete, neigh->alive)) {
1337
1338                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1339
1340                                 rcu_assign_pointer(*np,
1341                                                    rcu_dereference_protected(neigh->hnext,
1342                                                                              lockdep_is_held(&priv->lock)));
1343                                 /* remove from path/mc list */
1344                                 list_del_init(&neigh->list);
1345                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1346                         } else {
1347                                 np = &neigh->hnext;
1348                         }
1349
1350                 }
1351         }
1352
1353 out_unlock:
1354         spin_unlock_irqrestore(&priv->lock, flags);
1355         ipoib_mcast_remove_list(&remove_list);
1356 }
1357
1358 static void ipoib_reap_neigh(struct work_struct *work)
1359 {
1360         struct ipoib_dev_priv *priv =
1361                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1362
1363         __ipoib_reap_neigh(priv);
1364
1365         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1366                 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1367                                    arp_tbl.gc_interval);
1368 }
1369
1370
1371 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1372                                       struct net_device *dev)
1373 {
1374         struct ipoib_neigh *neigh;
1375
1376         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1377         if (!neigh)
1378                 return NULL;
1379
1380         neigh->dev = dev;
1381         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1382         skb_queue_head_init(&neigh->queue);
1383         INIT_LIST_HEAD(&neigh->list);
1384         ipoib_cm_set(neigh, NULL);
1385         /* one ref on behalf of the caller */
1386         atomic_set(&neigh->refcnt, 1);
1387
1388         return neigh;
1389 }
1390
1391 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1392                                       struct net_device *dev)
1393 {
1394         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1395         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1396         struct ipoib_neigh_hash *htbl;
1397         struct ipoib_neigh *neigh;
1398         u32 hash_val;
1399
1400         htbl = rcu_dereference_protected(ntbl->htbl,
1401                                          lockdep_is_held(&priv->lock));
1402         if (!htbl) {
1403                 neigh = NULL;
1404                 goto out_unlock;
1405         }
1406
1407         /* need to add a new neigh, but maybe some other thread succeeded?
1408          * recalc hash, maybe hash resize took place so we do a search
1409          */
1410         hash_val = ipoib_addr_hash(htbl, daddr);
1411         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1412                                                lockdep_is_held(&priv->lock));
1413              neigh != NULL;
1414              neigh = rcu_dereference_protected(neigh->hnext,
1415                                                lockdep_is_held(&priv->lock))) {
1416                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1417                         /* found, take one ref on behalf of the caller */
1418                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1419                                 /* deleted */
1420                                 neigh = NULL;
1421                                 break;
1422                         }
1423                         neigh->alive = jiffies;
1424                         goto out_unlock;
1425                 }
1426         }
1427
1428         neigh = ipoib_neigh_ctor(daddr, dev);
1429         if (!neigh)
1430                 goto out_unlock;
1431
1432         /* one ref on behalf of the hash table */
1433         atomic_inc(&neigh->refcnt);
1434         neigh->alive = jiffies;
1435         /* put in hash */
1436         rcu_assign_pointer(neigh->hnext,
1437                            rcu_dereference_protected(htbl->buckets[hash_val],
1438                                                      lockdep_is_held(&priv->lock)));
1439         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1440         atomic_inc(&ntbl->entries);
1441
1442 out_unlock:
1443
1444         return neigh;
1445 }
1446
1447 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1448 {
1449         /* neigh reference count was dropprd to zero */
1450         struct net_device *dev = neigh->dev;
1451         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1452         struct sk_buff *skb;
1453         if (neigh->ah)
1454                 ipoib_put_ah(neigh->ah);
1455         while ((skb = __skb_dequeue(&neigh->queue))) {
1456                 ++dev->stats.tx_dropped;
1457                 dev_kfree_skb_any(skb);
1458         }
1459         if (ipoib_cm_get(neigh))
1460                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1461         ipoib_dbg(ipoib_priv(dev),
1462                   "neigh free for %06x %pI6\n",
1463                   IPOIB_QPN(neigh->daddr),
1464                   neigh->daddr + 4);
1465         kfree(neigh);
1466         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1467                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1468                         complete(&priv->ntbl.flushed);
1469         }
1470 }
1471
1472 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1473 {
1474         /* Called as a result of removal from hash table */
1475         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1476         /* note TX context may hold another ref */
1477         ipoib_neigh_put(neigh);
1478 }
1479
1480 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1481 {
1482         struct net_device *dev = neigh->dev;
1483         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1484         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1485         struct ipoib_neigh_hash *htbl;
1486         struct ipoib_neigh __rcu **np;
1487         struct ipoib_neigh *n;
1488         u32 hash_val;
1489
1490         htbl = rcu_dereference_protected(ntbl->htbl,
1491                                         lockdep_is_held(&priv->lock));
1492         if (!htbl)
1493                 return;
1494
1495         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1496         np = &htbl->buckets[hash_val];
1497         for (n = rcu_dereference_protected(*np,
1498                                             lockdep_is_held(&priv->lock));
1499              n != NULL;
1500              n = rcu_dereference_protected(*np,
1501                                         lockdep_is_held(&priv->lock))) {
1502                 if (n == neigh) {
1503                         /* found */
1504                         rcu_assign_pointer(*np,
1505                                            rcu_dereference_protected(neigh->hnext,
1506                                                                      lockdep_is_held(&priv->lock)));
1507                         /* remove from parent list */
1508                         list_del_init(&neigh->list);
1509                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1510                         return;
1511                 } else {
1512                         np = &n->hnext;
1513                 }
1514         }
1515 }
1516
1517 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1518 {
1519         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1520         struct ipoib_neigh_hash *htbl;
1521         struct ipoib_neigh __rcu **buckets;
1522         u32 size;
1523
1524         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1525         ntbl->htbl = NULL;
1526         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1527         if (!htbl)
1528                 return -ENOMEM;
1529         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1530         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1531         buckets = kcalloc(size, sizeof(*buckets), GFP_KERNEL);
1532         if (!buckets) {
1533                 kfree(htbl);
1534                 return -ENOMEM;
1535         }
1536         htbl->size = size;
1537         htbl->mask = (size - 1);
1538         htbl->buckets = buckets;
1539         RCU_INIT_POINTER(ntbl->htbl, htbl);
1540         htbl->ntbl = ntbl;
1541         atomic_set(&ntbl->entries, 0);
1542
1543         /* start garbage collection */
1544         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1545         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1546                            arp_tbl.gc_interval);
1547
1548         return 0;
1549 }
1550
1551 static void neigh_hash_free_rcu(struct rcu_head *head)
1552 {
1553         struct ipoib_neigh_hash *htbl = container_of(head,
1554                                                     struct ipoib_neigh_hash,
1555                                                     rcu);
1556         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1557         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1558
1559         kfree(buckets);
1560         kfree(htbl);
1561         complete(&ntbl->deleted);
1562 }
1563
1564 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1565 {
1566         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1567         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1568         struct ipoib_neigh_hash *htbl;
1569         unsigned long flags;
1570         int i;
1571
1572         /* remove all neigh connected to a given path or mcast */
1573         spin_lock_irqsave(&priv->lock, flags);
1574
1575         htbl = rcu_dereference_protected(ntbl->htbl,
1576                                          lockdep_is_held(&priv->lock));
1577
1578         if (!htbl)
1579                 goto out_unlock;
1580
1581         for (i = 0; i < htbl->size; i++) {
1582                 struct ipoib_neigh *neigh;
1583                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1584
1585                 while ((neigh = rcu_dereference_protected(*np,
1586                                                           lockdep_is_held(&priv->lock))) != NULL) {
1587                         /* delete neighs belong to this parent */
1588                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1589                                 rcu_assign_pointer(*np,
1590                                                    rcu_dereference_protected(neigh->hnext,
1591                                                                              lockdep_is_held(&priv->lock)));
1592                                 /* remove from parent list */
1593                                 list_del_init(&neigh->list);
1594                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1595                         } else {
1596                                 np = &neigh->hnext;
1597                         }
1598
1599                 }
1600         }
1601 out_unlock:
1602         spin_unlock_irqrestore(&priv->lock, flags);
1603 }
1604
1605 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1606 {
1607         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1608         struct ipoib_neigh_hash *htbl;
1609         unsigned long flags;
1610         int i, wait_flushed = 0;
1611
1612         init_completion(&priv->ntbl.flushed);
1613         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1614
1615         spin_lock_irqsave(&priv->lock, flags);
1616
1617         htbl = rcu_dereference_protected(ntbl->htbl,
1618                                         lockdep_is_held(&priv->lock));
1619         if (!htbl)
1620                 goto out_unlock;
1621
1622         wait_flushed = atomic_read(&priv->ntbl.entries);
1623         if (!wait_flushed)
1624                 goto free_htbl;
1625
1626         for (i = 0; i < htbl->size; i++) {
1627                 struct ipoib_neigh *neigh;
1628                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1629
1630                 while ((neigh = rcu_dereference_protected(*np,
1631                                        lockdep_is_held(&priv->lock))) != NULL) {
1632                         rcu_assign_pointer(*np,
1633                                            rcu_dereference_protected(neigh->hnext,
1634                                                                      lockdep_is_held(&priv->lock)));
1635                         /* remove from path/mc list */
1636                         list_del_init(&neigh->list);
1637                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1638                 }
1639         }
1640
1641 free_htbl:
1642         rcu_assign_pointer(ntbl->htbl, NULL);
1643         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1644
1645 out_unlock:
1646         spin_unlock_irqrestore(&priv->lock, flags);
1647         if (wait_flushed)
1648                 wait_for_completion(&priv->ntbl.flushed);
1649 }
1650
1651 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1652 {
1653         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1654         int stopped;
1655
1656         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1657         init_completion(&priv->ntbl.deleted);
1658
1659         /* Stop GC if called at init fail need to cancel work */
1660         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1661         if (!stopped)
1662                 cancel_delayed_work(&priv->neigh_reap_task);
1663
1664         ipoib_flush_neighs(priv);
1665
1666         wait_for_completion(&priv->ntbl.deleted);
1667 }
1668
1669 static void ipoib_napi_add(struct net_device *dev)
1670 {
1671         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1672
1673         netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
1674         netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
1675 }
1676
1677 static void ipoib_napi_del(struct net_device *dev)
1678 {
1679         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1680
1681         netif_napi_del(&priv->recv_napi);
1682         netif_napi_del(&priv->send_napi);
1683 }
1684
1685 static void ipoib_dev_uninit_default(struct net_device *dev)
1686 {
1687         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1688
1689         ipoib_transport_dev_cleanup(dev);
1690
1691         ipoib_napi_del(dev);
1692
1693         ipoib_cm_dev_cleanup(dev);
1694
1695         kfree(priv->rx_ring);
1696         vfree(priv->tx_ring);
1697
1698         priv->rx_ring = NULL;
1699         priv->tx_ring = NULL;
1700 }
1701
1702 static int ipoib_dev_init_default(struct net_device *dev)
1703 {
1704         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1705
1706         ipoib_napi_add(dev);
1707
1708         /* Allocate RX/TX "rings" to hold queued skbs */
1709         priv->rx_ring = kcalloc(ipoib_recvq_size,
1710                                        sizeof(*priv->rx_ring),
1711                                        GFP_KERNEL);
1712         if (!priv->rx_ring)
1713                 goto out;
1714
1715         priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1716                                            sizeof(*priv->tx_ring)));
1717         if (!priv->tx_ring) {
1718                 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1719                         priv->ca->name, ipoib_sendq_size);
1720                 goto out_rx_ring_cleanup;
1721         }
1722
1723         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1724
1725         if (ipoib_transport_dev_init(dev, priv->ca)) {
1726                 pr_warn("%s: ipoib_transport_dev_init failed\n",
1727                         priv->ca->name);
1728                 goto out_tx_ring_cleanup;
1729         }
1730
1731         /* after qp created set dev address */
1732         priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
1733         priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
1734         priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
1735
1736         return 0;
1737
1738 out_tx_ring_cleanup:
1739         vfree(priv->tx_ring);
1740
1741 out_rx_ring_cleanup:
1742         kfree(priv->rx_ring);
1743
1744 out:
1745         ipoib_napi_del(dev);
1746         return -ENOMEM;
1747 }
1748
1749 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1750                        int cmd)
1751 {
1752         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1753
1754         if (!priv->rn_ops->ndo_do_ioctl)
1755                 return -EOPNOTSUPP;
1756
1757         return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
1758 }
1759
1760 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1761 {
1762         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1763         int ret = -ENOMEM;
1764
1765         priv->ca = ca;
1766         priv->port = port;
1767         priv->qp = NULL;
1768
1769         /*
1770          * the various IPoIB tasks assume they will never race against
1771          * themselves, so always use a single thread workqueue
1772          */
1773         priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1774         if (!priv->wq) {
1775                 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1776                 goto out;
1777         }
1778
1779         /* create pd, which used both for control and datapath*/
1780         priv->pd = ib_alloc_pd(priv->ca, 0);
1781         if (IS_ERR(priv->pd)) {
1782                 pr_warn("%s: failed to allocate PD\n", ca->name);
1783                 goto clean_wq;
1784         }
1785
1786         ret = priv->rn_ops->ndo_init(dev);
1787         if (ret) {
1788                 pr_warn("%s failed to init HW resource\n", dev->name);
1789                 goto out_free_pd;
1790         }
1791
1792         if (ipoib_neigh_hash_init(priv) < 0) {
1793                 pr_warn("%s failed to init neigh hash\n", dev->name);
1794                 goto out_dev_uninit;
1795         }
1796
1797         if (dev->flags & IFF_UP) {
1798                 if (ipoib_ib_dev_open(dev)) {
1799                         pr_warn("%s failed to open device\n", dev->name);
1800                         ret = -ENODEV;
1801                         goto out_dev_uninit;
1802                 }
1803         }
1804
1805         return 0;
1806
1807 out_dev_uninit:
1808         ipoib_ib_dev_cleanup(dev);
1809
1810 out_free_pd:
1811         if (priv->pd) {
1812                 ib_dealloc_pd(priv->pd);
1813                 priv->pd = NULL;
1814         }
1815
1816 clean_wq:
1817         if (priv->wq) {
1818                 destroy_workqueue(priv->wq);
1819                 priv->wq = NULL;
1820         }
1821
1822 out:
1823         return ret;
1824 }
1825
1826 void ipoib_dev_cleanup(struct net_device *dev)
1827 {
1828         struct ipoib_dev_priv *priv = ipoib_priv(dev), *cpriv, *tcpriv;
1829         LIST_HEAD(head);
1830
1831         ASSERT_RTNL();
1832
1833         /* Delete any child interfaces first */
1834         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1835                 /* Stop GC on child */
1836                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1837                 cancel_delayed_work(&cpriv->neigh_reap_task);
1838                 unregister_netdevice_queue(cpriv->dev, &head);
1839         }
1840         unregister_netdevice_many(&head);
1841
1842         ipoib_neigh_hash_uninit(dev);
1843
1844         ipoib_ib_dev_cleanup(dev);
1845
1846         /* no more works over the priv->wq */
1847         if (priv->wq) {
1848                 flush_workqueue(priv->wq);
1849                 destroy_workqueue(priv->wq);
1850                 priv->wq = NULL;
1851         }
1852 }
1853
1854 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1855 {
1856         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1857
1858         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1859 }
1860
1861 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1862                                struct ifla_vf_info *ivf)
1863 {
1864         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1865         int err;
1866
1867         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
1868         if (err)
1869                 return err;
1870
1871         ivf->vf = vf;
1872
1873         return 0;
1874 }
1875
1876 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
1877 {
1878         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1879
1880         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
1881                 return -EINVAL;
1882
1883         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
1884 }
1885
1886 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
1887                               struct ifla_vf_stats *vf_stats)
1888 {
1889         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1890
1891         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
1892 }
1893
1894 static const struct header_ops ipoib_header_ops = {
1895         .create = ipoib_hard_header,
1896 };
1897
1898 static const struct net_device_ops ipoib_netdev_ops_pf = {
1899         .ndo_uninit              = ipoib_uninit,
1900         .ndo_open                = ipoib_open,
1901         .ndo_stop                = ipoib_stop,
1902         .ndo_change_mtu          = ipoib_change_mtu,
1903         .ndo_fix_features        = ipoib_fix_features,
1904         .ndo_start_xmit          = ipoib_start_xmit,
1905         .ndo_tx_timeout          = ipoib_timeout,
1906         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1907         .ndo_get_iflink          = ipoib_get_iflink,
1908         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
1909         .ndo_get_vf_config       = ipoib_get_vf_config,
1910         .ndo_get_vf_stats        = ipoib_get_vf_stats,
1911         .ndo_set_vf_guid         = ipoib_set_vf_guid,
1912         .ndo_set_mac_address     = ipoib_set_mac,
1913         .ndo_get_stats64         = ipoib_get_stats,
1914         .ndo_do_ioctl            = ipoib_ioctl,
1915 };
1916
1917 static const struct net_device_ops ipoib_netdev_ops_vf = {
1918         .ndo_uninit              = ipoib_uninit,
1919         .ndo_open                = ipoib_open,
1920         .ndo_stop                = ipoib_stop,
1921         .ndo_change_mtu          = ipoib_change_mtu,
1922         .ndo_fix_features        = ipoib_fix_features,
1923         .ndo_start_xmit          = ipoib_start_xmit,
1924         .ndo_tx_timeout          = ipoib_timeout,
1925         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1926         .ndo_get_iflink          = ipoib_get_iflink,
1927         .ndo_get_stats64         = ipoib_get_stats,
1928         .ndo_do_ioctl            = ipoib_ioctl,
1929 };
1930
1931 void ipoib_setup_common(struct net_device *dev)
1932 {
1933         dev->header_ops          = &ipoib_header_ops;
1934
1935         ipoib_set_ethtool_ops(dev);
1936
1937         dev->watchdog_timeo      = HZ;
1938
1939         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1940
1941         dev->hard_header_len     = IPOIB_HARD_LEN;
1942         dev->addr_len            = INFINIBAND_ALEN;
1943         dev->type                = ARPHRD_INFINIBAND;
1944         dev->tx_queue_len        = ipoib_sendq_size * 2;
1945         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1946                                     NETIF_F_HIGHDMA);
1947         netif_keep_dst(dev);
1948
1949         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1950 }
1951
1952 static void ipoib_build_priv(struct net_device *dev)
1953 {
1954         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1955
1956         priv->dev = dev;
1957         spin_lock_init(&priv->lock);
1958         init_rwsem(&priv->vlan_rwsem);
1959         mutex_init(&priv->mcast_mutex);
1960         mutex_init(&priv->sysfs_mutex);
1961
1962         INIT_LIST_HEAD(&priv->path_list);
1963         INIT_LIST_HEAD(&priv->child_intfs);
1964         INIT_LIST_HEAD(&priv->dead_ahs);
1965         INIT_LIST_HEAD(&priv->multicast_list);
1966
1967         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1968         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1969         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1970         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1971         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1972         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1973         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1974         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1975 }
1976
1977 static const struct net_device_ops ipoib_netdev_default_pf = {
1978         .ndo_init                = ipoib_dev_init_default,
1979         .ndo_uninit              = ipoib_dev_uninit_default,
1980         .ndo_open                = ipoib_ib_dev_open_default,
1981         .ndo_stop                = ipoib_ib_dev_stop_default,
1982 };
1983
1984 static struct net_device
1985 *ipoib_create_netdev_default(struct ib_device *hca,
1986                              const char *name,
1987                              unsigned char name_assign_type,
1988                              void (*setup)(struct net_device *))
1989 {
1990         struct net_device *dev;
1991         struct rdma_netdev *rn;
1992
1993         dev = alloc_netdev((int)sizeof(struct rdma_netdev),
1994                            name,
1995                            name_assign_type, setup);
1996         if (!dev)
1997                 return NULL;
1998
1999         rn = netdev_priv(dev);
2000
2001         rn->send = ipoib_send;
2002         rn->attach_mcast = ipoib_mcast_attach;
2003         rn->detach_mcast = ipoib_mcast_detach;
2004         rn->free_rdma_netdev = free_netdev;
2005         rn->hca = hca;
2006
2007         dev->netdev_ops = &ipoib_netdev_default_pf;
2008
2009         return dev;
2010 }
2011
2012 static struct net_device *ipoib_get_netdev(struct ib_device *hca, u8 port,
2013                                            const char *name)
2014 {
2015         struct net_device *dev;
2016
2017         if (hca->alloc_rdma_netdev) {
2018                 dev = hca->alloc_rdma_netdev(hca, port,
2019                                              RDMA_NETDEV_IPOIB, name,
2020                                              NET_NAME_UNKNOWN,
2021                                              ipoib_setup_common);
2022                 if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP)
2023                         return NULL;
2024         }
2025
2026         if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP)
2027                 dev = ipoib_create_netdev_default(hca, name, NET_NAME_UNKNOWN,
2028                                                   ipoib_setup_common);
2029
2030         return dev;
2031 }
2032
2033 struct ipoib_dev_priv *ipoib_intf_alloc(struct ib_device *hca, u8 port,
2034                                         const char *name)
2035 {
2036         struct net_device *dev;
2037         struct ipoib_dev_priv *priv;
2038         struct rdma_netdev *rn;
2039
2040         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2041         if (!priv)
2042                 return NULL;
2043
2044         dev = ipoib_get_netdev(hca, port, name);
2045         if (!dev)
2046                 goto free_priv;
2047
2048         priv->rn_ops = dev->netdev_ops;
2049
2050         /* fixme : should be after the query_cap */
2051         if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
2052                 dev->netdev_ops = &ipoib_netdev_ops_vf;
2053         else
2054                 dev->netdev_ops = &ipoib_netdev_ops_pf;
2055
2056         rn = netdev_priv(dev);
2057         rn->clnt_priv = priv;
2058         ipoib_build_priv(dev);
2059
2060         return priv;
2061 free_priv:
2062         kfree(priv);
2063         return NULL;
2064 }
2065
2066 static ssize_t show_pkey(struct device *dev,
2067                          struct device_attribute *attr, char *buf)
2068 {
2069         struct net_device *ndev = to_net_dev(dev);
2070         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2071
2072         return sprintf(buf, "0x%04x\n", priv->pkey);
2073 }
2074 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2075
2076 static ssize_t show_umcast(struct device *dev,
2077                            struct device_attribute *attr, char *buf)
2078 {
2079         struct net_device *ndev = to_net_dev(dev);
2080         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2081
2082         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2083 }
2084
2085 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2086 {
2087         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2088
2089         if (umcast_val > 0) {
2090                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2091                 ipoib_warn(priv, "ignoring multicast groups joined directly "
2092                                 "by userspace\n");
2093         } else
2094                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2095 }
2096
2097 static ssize_t set_umcast(struct device *dev,
2098                           struct device_attribute *attr,
2099                           const char *buf, size_t count)
2100 {
2101         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2102
2103         ipoib_set_umcast(to_net_dev(dev), umcast_val);
2104
2105         return count;
2106 }
2107 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
2108
2109 int ipoib_add_umcast_attr(struct net_device *dev)
2110 {
2111         return device_create_file(&dev->dev, &dev_attr_umcast);
2112 }
2113
2114 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2115 {
2116         struct ipoib_dev_priv *child_priv;
2117         struct net_device *netdev = priv->dev;
2118
2119         netif_addr_lock_bh(netdev);
2120
2121         memcpy(&priv->local_gid.global.interface_id,
2122                &gid->global.interface_id,
2123                sizeof(gid->global.interface_id));
2124         memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
2125         clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2126
2127         netif_addr_unlock_bh(netdev);
2128
2129         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2130                 down_read(&priv->vlan_rwsem);
2131                 list_for_each_entry(child_priv, &priv->child_intfs, list)
2132                         set_base_guid(child_priv, gid);
2133                 up_read(&priv->vlan_rwsem);
2134         }
2135 }
2136
2137 static int ipoib_check_lladdr(struct net_device *dev,
2138                               struct sockaddr_storage *ss)
2139 {
2140         union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2141         int ret = 0;
2142
2143         netif_addr_lock_bh(dev);
2144
2145         /* Make sure the QPN, reserved and subnet prefix match the current
2146          * lladdr, it also makes sure the lladdr is unicast.
2147          */
2148         if (memcmp(dev->dev_addr, ss->__data,
2149                    4 + sizeof(gid->global.subnet_prefix)) ||
2150             gid->global.interface_id == 0)
2151                 ret = -EINVAL;
2152
2153         netif_addr_unlock_bh(dev);
2154
2155         return ret;
2156 }
2157
2158 static int ipoib_set_mac(struct net_device *dev, void *addr)
2159 {
2160         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2161         struct sockaddr_storage *ss = addr;
2162         int ret;
2163
2164         if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2165                 return -EBUSY;
2166
2167         ret = ipoib_check_lladdr(dev, ss);
2168         if (ret)
2169                 return ret;
2170
2171         set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2172
2173         queue_work(ipoib_workqueue, &priv->flush_light);
2174
2175         return 0;
2176 }
2177
2178 static ssize_t create_child(struct device *dev,
2179                             struct device_attribute *attr,
2180                             const char *buf, size_t count)
2181 {
2182         int pkey;
2183         int ret;
2184
2185         if (sscanf(buf, "%i", &pkey) != 1)
2186                 return -EINVAL;
2187
2188         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2189                 return -EINVAL;
2190
2191         /*
2192          * Set the full membership bit, so that we join the right
2193          * broadcast group, etc.
2194          */
2195         pkey |= 0x8000;
2196
2197         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2198
2199         return ret ? ret : count;
2200 }
2201 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
2202
2203 static ssize_t delete_child(struct device *dev,
2204                             struct device_attribute *attr,
2205                             const char *buf, size_t count)
2206 {
2207         int pkey;
2208         int ret;
2209
2210         if (sscanf(buf, "%i", &pkey) != 1)
2211                 return -EINVAL;
2212
2213         if (pkey < 0 || pkey > 0xffff)
2214                 return -EINVAL;
2215
2216         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2217
2218         return ret ? ret : count;
2219
2220 }
2221 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
2222
2223 int ipoib_add_pkey_attr(struct net_device *dev)
2224 {
2225         return device_create_file(&dev->dev, &dev_attr_pkey);
2226 }
2227
2228 void ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
2229 {
2230         priv->hca_caps = hca->attrs.device_cap_flags;
2231
2232         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
2233                 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
2234
2235                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
2236                         priv->dev->hw_features |= NETIF_F_TSO;
2237
2238                 priv->dev->features |= priv->dev->hw_features;
2239         }
2240 }
2241
2242 static struct net_device *ipoib_add_port(const char *format,
2243                                          struct ib_device *hca, u8 port)
2244 {
2245         struct ipoib_dev_priv *priv;
2246         struct ib_port_attr attr;
2247         struct rdma_netdev *rn;
2248         int result = -ENOMEM;
2249
2250         priv = ipoib_intf_alloc(hca, port, format);
2251         if (!priv) {
2252                 pr_warn("%s, %d: ipoib_intf_alloc failed\n", hca->name, port);
2253                 goto alloc_mem_failed;
2254         }
2255
2256         SET_NETDEV_DEV(priv->dev, hca->dev.parent);
2257         priv->dev->dev_id = port - 1;
2258
2259         result = ib_query_port(hca, port, &attr);
2260         if (result) {
2261                 pr_warn("%s: ib_query_port %d failed\n", hca->name, port);
2262                 goto device_init_failed;
2263         }
2264
2265         priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
2266
2267         /* MTU will be reset when mcast join happens */
2268         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
2269         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
2270         priv->dev->max_mtu = IPOIB_CM_MTU;
2271
2272         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
2273
2274         result = ib_query_pkey(hca, port, 0, &priv->pkey);
2275         if (result) {
2276                 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
2277                         hca->name, port, result);
2278                 goto device_init_failed;
2279         }
2280
2281         ipoib_set_dev_features(priv, hca);
2282
2283         /*
2284          * Set the full membership bit, so that we join the right
2285          * broadcast group, etc.
2286          */
2287         priv->pkey |= 0x8000;
2288
2289         priv->dev->broadcast[8] = priv->pkey >> 8;
2290         priv->dev->broadcast[9] = priv->pkey & 0xff;
2291
2292         result = rdma_query_gid(hca, port, 0, &priv->local_gid);
2293         if (result) {
2294                 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
2295                         hca->name, port, result);
2296                 goto device_init_failed;
2297         }
2298
2299         memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
2300                sizeof(union ib_gid));
2301         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2302
2303         result = ipoib_dev_init(priv->dev, hca, port);
2304         if (result) {
2305                 pr_warn("%s: failed to initialize port %d (ret = %d)\n",
2306                         hca->name, port, result);
2307                 goto device_init_failed;
2308         }
2309
2310         INIT_IB_EVENT_HANDLER(&priv->event_handler,
2311                               priv->ca, ipoib_event);
2312         ib_register_event_handler(&priv->event_handler);
2313
2314         /* call event handler to ensure pkey in sync */
2315         queue_work(ipoib_workqueue, &priv->flush_heavy);
2316
2317         result = register_netdev(priv->dev);
2318         if (result) {
2319                 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2320                         hca->name, port, result);
2321                 goto register_failed;
2322         }
2323
2324         result = -ENOMEM;
2325         if (ipoib_cm_add_mode_attr(priv->dev))
2326                 goto sysfs_failed;
2327         if (ipoib_add_pkey_attr(priv->dev))
2328                 goto sysfs_failed;
2329         if (ipoib_add_umcast_attr(priv->dev))
2330                 goto sysfs_failed;
2331         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
2332                 goto sysfs_failed;
2333         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
2334                 goto sysfs_failed;
2335
2336         return priv->dev;
2337
2338 sysfs_failed:
2339         unregister_netdev(priv->dev);
2340
2341 register_failed:
2342         ib_unregister_event_handler(&priv->event_handler);
2343         flush_workqueue(ipoib_workqueue);
2344         /* Stop GC if started before flush */
2345         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2346         cancel_delayed_work(&priv->neigh_reap_task);
2347         flush_workqueue(priv->wq);
2348         ipoib_dev_cleanup(priv->dev);
2349
2350 device_init_failed:
2351         rn = netdev_priv(priv->dev);
2352         rn->free_rdma_netdev(priv->dev);
2353         kfree(priv);
2354
2355 alloc_mem_failed:
2356         return ERR_PTR(result);
2357 }
2358
2359 static void ipoib_add_one(struct ib_device *device)
2360 {
2361         struct list_head *dev_list;
2362         struct net_device *dev;
2363         struct ipoib_dev_priv *priv;
2364         int p;
2365         int count = 0;
2366
2367         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
2368         if (!dev_list)
2369                 return;
2370
2371         INIT_LIST_HEAD(dev_list);
2372
2373         for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
2374                 if (!rdma_protocol_ib(device, p))
2375                         continue;
2376                 dev = ipoib_add_port("ib%d", device, p);
2377                 if (!IS_ERR(dev)) {
2378                         priv = ipoib_priv(dev);
2379                         list_add_tail(&priv->list, dev_list);
2380                         count++;
2381                 }
2382         }
2383
2384         if (!count) {
2385                 kfree(dev_list);
2386                 return;
2387         }
2388
2389         ib_set_client_data(device, &ipoib_client, dev_list);
2390 }
2391
2392 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2393 {
2394         struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2395         struct list_head *dev_list = client_data;
2396
2397         if (!dev_list)
2398                 return;
2399
2400         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2401                 struct rdma_netdev *parent_rn = netdev_priv(priv->dev);
2402
2403                 ib_unregister_event_handler(&priv->event_handler);
2404                 flush_workqueue(ipoib_workqueue);
2405
2406                 /* mark interface in the middle of destruction */
2407                 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags);
2408
2409                 rtnl_lock();
2410                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
2411                 rtnl_unlock();
2412
2413                 /* Stop GC */
2414                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2415                 cancel_delayed_work(&priv->neigh_reap_task);
2416                 flush_workqueue(priv->wq);
2417
2418                 /* Wrap rtnl_lock/unlock with mutex to protect sysfs calls */
2419                 mutex_lock(&priv->sysfs_mutex);
2420                 unregister_netdev(priv->dev);
2421                 mutex_unlock(&priv->sysfs_mutex);
2422
2423                 parent_rn->free_rdma_netdev(priv->dev);
2424
2425                 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
2426                         struct rdma_netdev *child_rn;
2427
2428                         child_rn = netdev_priv(cpriv->dev);
2429                         child_rn->free_rdma_netdev(cpriv->dev);
2430                         kfree(cpriv);
2431                 }
2432
2433                 kfree(priv);
2434         }
2435
2436         kfree(dev_list);
2437 }
2438
2439 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2440 static struct notifier_block ipoib_netdev_notifier = {
2441         .notifier_call = ipoib_netdev_event,
2442 };
2443 #endif
2444
2445 static int __init ipoib_init_module(void)
2446 {
2447         int ret;
2448
2449         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2450         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2451         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2452
2453         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2454         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2455         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2456 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2457         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2458         ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2459 #endif
2460
2461         /*
2462          * When copying small received packets, we only copy from the
2463          * linear data part of the SKB, so we rely on this condition.
2464          */
2465         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2466
2467         ret = ipoib_register_debugfs();
2468         if (ret)
2469                 return ret;
2470
2471         /*
2472          * We create a global workqueue here that is used for all flush
2473          * operations.  However, if you attempt to flush a workqueue
2474          * from a task on that same workqueue, it deadlocks the system.
2475          * We want to be able to flush the tasks associated with a
2476          * specific net device, so we also create a workqueue for each
2477          * netdevice.  We queue up the tasks for that device only on
2478          * its private workqueue, and we only queue up flush events
2479          * on our global flush workqueue.  This avoids the deadlocks.
2480          */
2481         ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush",
2482                                                   WQ_MEM_RECLAIM);
2483         if (!ipoib_workqueue) {
2484                 ret = -ENOMEM;
2485                 goto err_fs;
2486         }
2487
2488         ib_sa_register_client(&ipoib_sa_client);
2489
2490         ret = ib_register_client(&ipoib_client);
2491         if (ret)
2492                 goto err_sa;
2493
2494         ret = ipoib_netlink_init();
2495         if (ret)
2496                 goto err_client;
2497
2498 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2499         register_netdevice_notifier(&ipoib_netdev_notifier);
2500 #endif
2501         return 0;
2502
2503 err_client:
2504         ib_unregister_client(&ipoib_client);
2505
2506 err_sa:
2507         ib_sa_unregister_client(&ipoib_sa_client);
2508         destroy_workqueue(ipoib_workqueue);
2509
2510 err_fs:
2511         ipoib_unregister_debugfs();
2512
2513         return ret;
2514 }
2515
2516 static void __exit ipoib_cleanup_module(void)
2517 {
2518 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2519         unregister_netdevice_notifier(&ipoib_netdev_notifier);
2520 #endif
2521         ipoib_netlink_fini();
2522         ib_unregister_client(&ipoib_client);
2523         ib_sa_unregister_client(&ipoib_sa_client);
2524         ipoib_unregister_debugfs();
2525         destroy_workqueue(ipoib_workqueue);
2526 }
2527
2528 module_init(ipoib_init_module);
2529 module_exit(ipoib_cleanup_module);