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                 path->valid =  0;
 701         }
 702
 703         spin_unlock_irq(&priv->lock);
 704 }
 705
 706 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
 707 {
 708         struct ipoib_pseudo_header *phdr;
 709
 710         phdr = skb_push(skb, sizeof(*phdr));
 711         memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 712 }
 713
 714 void ipoib_flush_paths(struct net_device *dev)
 715 {
 716         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 717         struct ipoib_path *path, *tp;
 718         LIST_HEAD(remove_list);
 719         unsigned long flags;
 720
 721         netif_tx_lock_bh(dev);
 722         spin_lock_irqsave(&priv->lock, flags);
 723
 724         list_splice_init(&priv->path_list, &remove_list);
 725
 726         list_for_each_entry(path, &remove_list, list)
 727                 rb_erase(&path->rb_node, &priv->path_tree);
 728
 729         list_for_each_entry_safe(path, tp, &remove_list, list) {
 730                 if (path->query)
 731                         ib_sa_cancel_query(path->query_id, path->query);
 732                 spin_unlock_irqrestore(&priv->lock, flags);
 733                 netif_tx_unlock_bh(dev);
 734                 wait_for_completion(&path->done);
 735                 path_free(dev, path);
 736                 netif_tx_lock_bh(dev);
 737                 spin_lock_irqsave(&priv->lock, flags);
 738         }
 739
 740         spin_unlock_irqrestore(&priv->lock, flags);
 741         netif_tx_unlock_bh(dev);
 742 }
 743
 744 static void path_rec_completion(int status,
 745                                 struct sa_path_rec *pathrec,
 746                                 void *path_ptr)
 747 {
 748         struct ipoib_path *path = path_ptr;
 749         struct net_device *dev = path->dev;
 750         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 751         struct ipoib_ah *ah = NULL;
 752         struct ipoib_ah *old_ah = NULL;
 753         struct ipoib_neigh *neigh, *tn;
 754         struct sk_buff_head skqueue;
 755         struct sk_buff *skb;
 756         unsigned long flags;
 757
 758         if (!status)
 759                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 760                           be32_to_cpu(sa_path_get_dlid(pathrec)),
 761                           pathrec->dgid.raw);
 762         else
 763                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 764                           status, path->pathrec.dgid.raw);
 765
 766         skb_queue_head_init(&skqueue);
 767
 768         if (!status) {
 769                 struct rdma_ah_attr av;
 770
 771                 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
 772                                                pathrec, &av))
 773                         ah = ipoib_create_ah(dev, priv->pd, &av);
 774         }
 775
 776         spin_lock_irqsave(&priv->lock, flags);
 777
 778         if (!IS_ERR_OR_NULL(ah)) {
 779                 /*
 780                  * pathrec.dgid is used as the database key from the LLADDR,
 781                  * it must remain unchanged even if the SA returns a different
 782                  * GID to use in the AH.
 783                  */
 784                 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
 785                            sizeof(union ib_gid))) {
 786                         ipoib_dbg(
 787                                 priv,
 788                                 "%s got PathRec for gid %pI6 while asked for %pI6\n",
 789                                 dev->name, pathrec->dgid.raw,
 790                                 path->pathrec.dgid.raw);
 791                         memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
 792                                sizeof(union ib_gid));
 793                 }
 794
 795                 path->pathrec = *pathrec;
 796
 797                 old_ah   = path->ah;
 798                 path->ah = ah;
 799
 800                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 801                           ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
 802                           pathrec->sl);
 803
 804                 while ((skb = __skb_dequeue(&path->queue)))
 805                         __skb_queue_tail(&skqueue, skb);
 806
 807                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 808                         if (neigh->ah) {
 809                                 WARN_ON(neigh->ah != old_ah);
 810                                 /*
 811                                  * Dropping the ah reference inside
 812                                  * priv->lock is safe here, because we
 813                                  * will hold one more reference from
 814                                  * the original value of path->ah (ie
 815                                  * old_ah).
 816                                  */
 817                                 ipoib_put_ah(neigh->ah);
 818                         }
 819                         kref_get(&path->ah->ref);
 820                         neigh->ah = path->ah;
 821
 822                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 823                                 if (!ipoib_cm_get(neigh))
 824                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 825                                                                                path,
 826                                                                                neigh));
 827                                 if (!ipoib_cm_get(neigh)) {
 828                                         ipoib_neigh_free(neigh);
 829                                         continue;
 830                                 }
 831                         }
 832
 833                         while ((skb = __skb_dequeue(&neigh->queue)))
 834                                 __skb_queue_tail(&skqueue, skb);
 835                 }
 836                 path->valid = 1;
 837         }
 838
 839         path->query = NULL;
 840         complete(&path->done);
 841
 842         spin_unlock_irqrestore(&priv->lock, flags);
 843
 844         if (IS_ERR_OR_NULL(ah))
 845                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 846
 847         if (old_ah)
 848                 ipoib_put_ah(old_ah);
 849
 850         while ((skb = __skb_dequeue(&skqueue))) {
 851                 int ret;
 852                 skb->dev = dev;
 853                 ret = dev_queue_xmit(skb);
 854                 if (ret)
 855                         ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
 856                                    __func__, ret);
 857         }
 858 }
 859
 860 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
 861                           void *gid)
 862 {
 863         path->dev = priv->dev;
 864
 865         if (rdma_cap_opa_ah(priv->ca, priv->port))
 866                 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
 867         else
 868                 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
 869
 870         memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
 871         path->pathrec.sgid          = priv->local_gid;
 872         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 873         path->pathrec.numb_path     = 1;
 874         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 875 }
 876
 877 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 878 {
 879         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 880         struct ipoib_path *path;
 881
 882         if (!priv->broadcast)
 883                 return NULL;
 884
 885         path = kzalloc(sizeof *path, GFP_ATOMIC);
 886         if (!path)
 887                 return NULL;
 888
 889         skb_queue_head_init(&path->queue);
 890
 891         INIT_LIST_HEAD(&path->neigh_list);
 892
 893         init_path_rec(priv, path, gid);
 894
 895         return path;
 896 }
 897
 898 static int path_rec_start(struct net_device *dev,
 899                           struct ipoib_path *path)
 900 {
 901         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 902
 903         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 904                   path->pathrec.dgid.raw);
 905
 906         init_completion(&path->done);
 907
 908         path->query_id =
 909                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 910                                    &path->pathrec,
 911                                    IB_SA_PATH_REC_DGID          |
 912                                    IB_SA_PATH_REC_SGID          |
 913                                    IB_SA_PATH_REC_NUMB_PATH     |
 914                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 915                                    IB_SA_PATH_REC_PKEY,
 916                                    1000, GFP_ATOMIC,
 917                                    path_rec_completion,
 918                                    path, &path->query);
 919         if (path->query_id < 0) {
 920                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 921                 path->query = NULL;
 922                 complete(&path->done);
 923                 return path->query_id;
 924         }
 925
 926         return 0;
 927 }
 928
 929 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
 930                                           struct net_device *dev)
 931 {
 932         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 933         struct rdma_netdev *rn = netdev_priv(dev);
 934         struct ipoib_path *path;
 935         struct ipoib_neigh *neigh;
 936         unsigned long flags;
 937
 938         spin_lock_irqsave(&priv->lock, flags);
 939         neigh = ipoib_neigh_alloc(daddr, dev);
 940         if (!neigh) {
 941                 spin_unlock_irqrestore(&priv->lock, flags);
 942                 ++dev->stats.tx_dropped;
 943                 dev_kfree_skb_any(skb);
 944                 return NULL;
 945         }
 946
 947         /* To avoid race condition, make sure that the
 948          * neigh will be added only once.
 949          */
 950         if (unlikely(!list_empty(&neigh->list))) {
 951                 spin_unlock_irqrestore(&priv->lock, flags);
 952                 return neigh;
 953         }
 954
 955         path = __path_find(dev, daddr + 4);
 956         if (!path) {
 957                 path = path_rec_create(dev, daddr + 4);
 958                 if (!path)
 959                         goto err_path;
 960
 961                 __path_add(dev, path);
 962         }
 963
 964         list_add_tail(&neigh->list, &path->neigh_list);
 965
 966         if (path->ah) {
 967                 kref_get(&path->ah->ref);
 968                 neigh->ah = path->ah;
 969
 970                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 971                         if (!ipoib_cm_get(neigh))
 972                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 973                         if (!ipoib_cm_get(neigh)) {
 974                                 ipoib_neigh_free(neigh);
 975                                 goto err_drop;
 976                         }
 977                         if (skb_queue_len(&neigh->queue) <
 978                             IPOIB_MAX_PATH_REC_QUEUE) {
 979                                 push_pseudo_header(skb, neigh->daddr);
 980                                 __skb_queue_tail(&neigh->queue, skb);
 981                         } else {
 982                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 983                                            skb_queue_len(&neigh->queue));
 984                                 goto err_drop;
 985                         }
 986                 } else {
 987                         spin_unlock_irqrestore(&priv->lock, flags);
 988                         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
 989                                                        IPOIB_QPN(daddr));
 990                         ipoib_neigh_put(neigh);
 991                         return NULL;
 992                 }
 993         } else {
 994                 neigh->ah  = NULL;
 995
 996                 if (!path->query && path_rec_start(dev, path))
 997                         goto err_path;
 998                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 999                         push_pseudo_header(skb, neigh->daddr);
1000                         __skb_queue_tail(&neigh->queue, skb);
1001                 } else {
1002                         goto err_drop;
1003                 }
1004         }
1005
1006         spin_unlock_irqrestore(&priv->lock, flags);
1007         ipoib_neigh_put(neigh);
1008         return NULL;
1009
1010 err_path:
1011         ipoib_neigh_free(neigh);
1012 err_drop:
1013         ++dev->stats.tx_dropped;
1014         dev_kfree_skb_any(skb);
1015
1016         spin_unlock_irqrestore(&priv->lock, flags);
1017         ipoib_neigh_put(neigh);
1018
1019         return NULL;
1020 }
1021
1022 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1023                              struct ipoib_pseudo_header *phdr)
1024 {
1025         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1026         struct rdma_netdev *rn = netdev_priv(dev);
1027         struct ipoib_path *path;
1028         unsigned long flags;
1029
1030         spin_lock_irqsave(&priv->lock, flags);
1031
1032         /* no broadcast means that all paths are (going to be) not valid */
1033         if (!priv->broadcast)
1034                 goto drop_and_unlock;
1035
1036         path = __path_find(dev, phdr->hwaddr + 4);
1037         if (!path || !path->valid) {
1038                 int new_path = 0;
1039
1040                 if (!path) {
1041                         path = path_rec_create(dev, phdr->hwaddr + 4);
1042                         new_path = 1;
1043                 }
1044                 if (path) {
1045                         if (!new_path)
1046                                 /* make sure there is no changes in the existing path record */
1047                                 init_path_rec(priv, path, phdr->hwaddr + 4);
1048
1049                         if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1050                                 push_pseudo_header(skb, phdr->hwaddr);
1051                                 __skb_queue_tail(&path->queue, skb);
1052                         } else {
1053                                 ++dev->stats.tx_dropped;
1054                                 dev_kfree_skb_any(skb);
1055                         }
1056
1057                         if (!path->query && path_rec_start(dev, path)) {
1058                                 spin_unlock_irqrestore(&priv->lock, flags);
1059                                 if (new_path)
1060                                         path_free(dev, path);
1061                                 return;
1062                         } else
1063                                 __path_add(dev, path);
1064                 } else {
1065                         goto drop_and_unlock;
1066                 }
1067
1068                 spin_unlock_irqrestore(&priv->lock, flags);
1069                 return;
1070         }
1071
1072         if (path->ah) {
1073                 ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1074                           be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1075
1076                 spin_unlock_irqrestore(&priv->lock, flags);
1077                 path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1078                                                IPOIB_QPN(phdr->hwaddr));
1079                 return;
1080         } else if ((path->query || !path_rec_start(dev, path)) &&
1081                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1082                 push_pseudo_header(skb, phdr->hwaddr);
1083                 __skb_queue_tail(&path->queue, skb);
1084         } else {
1085                 goto drop_and_unlock;
1086         }
1087
1088         spin_unlock_irqrestore(&priv->lock, flags);
1089         return;
1090
1091 drop_and_unlock:
1092         ++dev->stats.tx_dropped;
1093         dev_kfree_skb_any(skb);
1094         spin_unlock_irqrestore(&priv->lock, flags);
1095 }
1096
1097 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1098 {
1099         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1100         struct rdma_netdev *rn = netdev_priv(dev);
1101         struct ipoib_neigh *neigh;
1102         struct ipoib_pseudo_header *phdr;
1103         struct ipoib_header *header;
1104         unsigned long flags;
1105
1106         phdr = (struct ipoib_pseudo_header *) skb->data;
1107         skb_pull(skb, sizeof(*phdr));
1108         header = (struct ipoib_header *) skb->data;
1109
1110         if (unlikely(phdr->hwaddr[4] == 0xff)) {
1111                 /* multicast, arrange "if" according to probability */
1112                 if ((header->proto != htons(ETH_P_IP)) &&
1113                     (header->proto != htons(ETH_P_IPV6)) &&
1114                     (header->proto != htons(ETH_P_ARP)) &&
1115                     (header->proto != htons(ETH_P_RARP)) &&
1116                     (header->proto != htons(ETH_P_TIPC))) {
1117                         /* ethertype not supported by IPoIB */
1118                         ++dev->stats.tx_dropped;
1119                         dev_kfree_skb_any(skb);
1120                         return NETDEV_TX_OK;
1121                 }
1122                 /* Add in the P_Key for multicast*/
1123                 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1124                 phdr->hwaddr[9] = priv->pkey & 0xff;
1125
1126                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1127                 if (likely(neigh))
1128                         goto send_using_neigh;
1129                 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1130                 return NETDEV_TX_OK;
1131         }
1132
1133         /* unicast, arrange "switch" according to probability */
1134         switch (header->proto) {
1135         case htons(ETH_P_IP):
1136         case htons(ETH_P_IPV6):
1137         case htons(ETH_P_TIPC):
1138                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1139                 if (unlikely(!neigh)) {
1140                         neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1141                         if (likely(!neigh))
1142                                 return NETDEV_TX_OK;
1143                 }
1144                 break;
1145         case htons(ETH_P_ARP):
1146         case htons(ETH_P_RARP):
1147                 /* for unicast ARP and RARP should always perform path find */
1148                 unicast_arp_send(skb, dev, phdr);
1149                 return NETDEV_TX_OK;
1150         default:
1151                 /* ethertype not supported by IPoIB */
1152                 ++dev->stats.tx_dropped;
1153                 dev_kfree_skb_any(skb);
1154                 return NETDEV_TX_OK;
1155         }
1156
1157 send_using_neigh:
1158         /* note we now hold a ref to neigh */
1159         if (ipoib_cm_get(neigh)) {
1160                 if (ipoib_cm_up(neigh)) {
1161                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1162                         goto unref;
1163                 }
1164         } else if (neigh->ah) {
1165                 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1166                                                 IPOIB_QPN(phdr->hwaddr));
1167                 goto unref;
1168         }
1169
1170         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1171                 push_pseudo_header(skb, phdr->hwaddr);
1172                 spin_lock_irqsave(&priv->lock, flags);
1173                 __skb_queue_tail(&neigh->queue, skb);
1174                 spin_unlock_irqrestore(&priv->lock, flags);
1175         } else {
1176                 ++dev->stats.tx_dropped;
1177                 dev_kfree_skb_any(skb);
1178         }
1179
1180 unref:
1181         ipoib_neigh_put(neigh);
1182
1183         return NETDEV_TX_OK;
1184 }
1185
1186 static void ipoib_timeout(struct net_device *dev)
1187 {
1188         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1189
1190         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1191                    jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1192         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1193                    netif_queue_stopped(dev),
1194                    priv->tx_head, priv->tx_tail);
1195         /* XXX reset QP, etc. */
1196 }
1197
1198 static int ipoib_hard_header(struct sk_buff *skb,
1199                              struct net_device *dev,
1200                              unsigned short type,
1201                              const void *daddr, const void *saddr, unsigned len)
1202 {
1203         struct ipoib_header *header;
1204
1205         header = skb_push(skb, sizeof *header);
1206
1207         header->proto = htons(type);
1208         header->reserved = 0;
1209
1210         /*
1211          * we don't rely on dst_entry structure,  always stuff the
1212          * destination address into skb hard header so we can figure out where
1213          * to send the packet later.
1214          */
1215         push_pseudo_header(skb, daddr);
1216
1217         return IPOIB_HARD_LEN;
1218 }
1219
1220 static void ipoib_set_mcast_list(struct net_device *dev)
1221 {
1222         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1223
1224         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1225                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1226                 return;
1227         }
1228
1229         queue_work(priv->wq, &priv->restart_task);
1230 }
1231
1232 static int ipoib_get_iflink(const struct net_device *dev)
1233 {
1234         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1235
1236         /* parent interface */
1237         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1238                 return dev->ifindex;
1239
1240         /* child/vlan interface */
1241         return priv->parent->ifindex;
1242 }
1243
1244 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1245 {
1246         /*
1247          * Use only the address parts that contributes to spreading
1248          * The subnet prefix is not used as one can not connect to
1249          * same remote port (GUID) using the same remote QPN via two
1250          * different subnets.
1251          */
1252          /* qpn octets[1:4) & port GUID octets[12:20) */
1253         u32 *d32 = (u32 *) daddr;
1254         u32 hv;
1255
1256         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1257         return hv & htbl->mask;
1258 }
1259
1260 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1261 {
1262         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1263         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1264         struct ipoib_neigh_hash *htbl;
1265         struct ipoib_neigh *neigh = NULL;
1266         u32 hash_val;
1267
1268         rcu_read_lock_bh();
1269
1270         htbl = rcu_dereference_bh(ntbl->htbl);
1271
1272         if (!htbl)
1273                 goto out_unlock;
1274
1275         hash_val = ipoib_addr_hash(htbl, daddr);
1276         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1277              neigh != NULL;
1278              neigh = rcu_dereference_bh(neigh->hnext)) {
1279                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1280                         /* found, take one ref on behalf of the caller */
1281                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1282                                 /* deleted */
1283                                 neigh = NULL;
1284                                 goto out_unlock;
1285                         }
1286
1287                         if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1288                                 neigh->alive = jiffies;
1289                         goto out_unlock;
1290                 }
1291         }
1292
1293 out_unlock:
1294         rcu_read_unlock_bh();
1295         return neigh;
1296 }
1297
1298 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1299 {
1300         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1301         struct ipoib_neigh_hash *htbl;
1302         unsigned long neigh_obsolete;
1303         unsigned long dt;
1304         unsigned long flags;
1305         int i;
1306         LIST_HEAD(remove_list);
1307
1308         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1309                 return;
1310
1311         spin_lock_irqsave(&priv->lock, flags);
1312
1313         htbl = rcu_dereference_protected(ntbl->htbl,
1314                                          lockdep_is_held(&priv->lock));
1315
1316         if (!htbl)
1317                 goto out_unlock;
1318
1319         /* neigh is obsolete if it was idle for two GC periods */
1320         dt = 2 * arp_tbl.gc_interval;
1321         neigh_obsolete = jiffies - dt;
1322         /* handle possible race condition */
1323         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1324                 goto out_unlock;
1325
1326         for (i = 0; i < htbl->size; i++) {
1327                 struct ipoib_neigh *neigh;
1328                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1329
1330                 while ((neigh = rcu_dereference_protected(*np,
1331                                                           lockdep_is_held(&priv->lock))) != NULL) {
1332                         /* was the neigh idle for two GC periods */
1333                         if (time_after(neigh_obsolete, neigh->alive)) {
1334
1335                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1336
1337                                 rcu_assign_pointer(*np,
1338                                                    rcu_dereference_protected(neigh->hnext,
1339                                                                              lockdep_is_held(&priv->lock)));
1340                                 /* remove from path/mc list */
1341                                 list_del_init(&neigh->list);
1342                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1343                         } else {
1344                                 np = &neigh->hnext;
1345                         }
1346
1347                 }
1348         }
1349
1350 out_unlock:
1351         spin_unlock_irqrestore(&priv->lock, flags);
1352         ipoib_mcast_remove_list(&remove_list);
1353 }
1354
1355 static void ipoib_reap_neigh(struct work_struct *work)
1356 {
1357         struct ipoib_dev_priv *priv =
1358                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1359
1360         __ipoib_reap_neigh(priv);
1361
1362         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1363                 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1364                                    arp_tbl.gc_interval);
1365 }
1366
1367
1368 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1369                                       struct net_device *dev)
1370 {
1371         struct ipoib_neigh *neigh;
1372
1373         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1374         if (!neigh)
1375                 return NULL;
1376
1377         neigh->dev = dev;
1378         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1379         skb_queue_head_init(&neigh->queue);
1380         INIT_LIST_HEAD(&neigh->list);
1381         ipoib_cm_set(neigh, NULL);
1382         /* one ref on behalf of the caller */
1383         atomic_set(&neigh->refcnt, 1);
1384
1385         return neigh;
1386 }
1387
1388 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1389                                       struct net_device *dev)
1390 {
1391         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1392         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1393         struct ipoib_neigh_hash *htbl;
1394         struct ipoib_neigh *neigh;
1395         u32 hash_val;
1396
1397         htbl = rcu_dereference_protected(ntbl->htbl,
1398                                          lockdep_is_held(&priv->lock));
1399         if (!htbl) {
1400                 neigh = NULL;
1401                 goto out_unlock;
1402         }
1403
1404         /* need to add a new neigh, but maybe some other thread succeeded?
1405          * recalc hash, maybe hash resize took place so we do a search
1406          */
1407         hash_val = ipoib_addr_hash(htbl, daddr);
1408         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1409                                                lockdep_is_held(&priv->lock));
1410              neigh != NULL;
1411              neigh = rcu_dereference_protected(neigh->hnext,
1412                                                lockdep_is_held(&priv->lock))) {
1413                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1414                         /* found, take one ref on behalf of the caller */
1415                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1416                                 /* deleted */
1417                                 neigh = NULL;
1418                                 break;
1419                         }
1420                         neigh->alive = jiffies;
1421                         goto out_unlock;
1422                 }
1423         }
1424
1425         neigh = ipoib_neigh_ctor(daddr, dev);
1426         if (!neigh)
1427                 goto out_unlock;
1428
1429         /* one ref on behalf of the hash table */
1430         atomic_inc(&neigh->refcnt);
1431         neigh->alive = jiffies;
1432         /* put in hash */
1433         rcu_assign_pointer(neigh->hnext,
1434                            rcu_dereference_protected(htbl->buckets[hash_val],
1435                                                      lockdep_is_held(&priv->lock)));
1436         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1437         atomic_inc(&ntbl->entries);
1438
1439 out_unlock:
1440
1441         return neigh;
1442 }
1443
1444 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1445 {
1446         /* neigh reference count was dropprd to zero */
1447         struct net_device *dev = neigh->dev;
1448         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1449         struct sk_buff *skb;
1450         if (neigh->ah)
1451                 ipoib_put_ah(neigh->ah);
1452         while ((skb = __skb_dequeue(&neigh->queue))) {
1453                 ++dev->stats.tx_dropped;
1454                 dev_kfree_skb_any(skb);
1455         }
1456         if (ipoib_cm_get(neigh))
1457                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1458         ipoib_dbg(ipoib_priv(dev),
1459                   "neigh free for %06x %pI6\n",
1460                   IPOIB_QPN(neigh->daddr),
1461                   neigh->daddr + 4);
1462         kfree(neigh);
1463         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1464                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1465                         complete(&priv->ntbl.flushed);
1466         }
1467 }
1468
1469 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1470 {
1471         /* Called as a result of removal from hash table */
1472         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1473         /* note TX context may hold another ref */
1474         ipoib_neigh_put(neigh);
1475 }
1476
1477 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1478 {
1479         struct net_device *dev = neigh->dev;
1480         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1481         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1482         struct ipoib_neigh_hash *htbl;
1483         struct ipoib_neigh __rcu **np;
1484         struct ipoib_neigh *n;
1485         u32 hash_val;
1486
1487         htbl = rcu_dereference_protected(ntbl->htbl,
1488                                         lockdep_is_held(&priv->lock));
1489         if (!htbl)
1490                 return;
1491
1492         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1493         np = &htbl->buckets[hash_val];
1494         for (n = rcu_dereference_protected(*np,
1495                                             lockdep_is_held(&priv->lock));
1496              n != NULL;
1497              n = rcu_dereference_protected(*np,
1498                                         lockdep_is_held(&priv->lock))) {
1499                 if (n == neigh) {
1500                         /* found */
1501                         rcu_assign_pointer(*np,
1502                                            rcu_dereference_protected(neigh->hnext,
1503                                                                      lockdep_is_held(&priv->lock)));
1504                         /* remove from parent list */
1505                         list_del_init(&neigh->list);
1506                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1507                         return;
1508                 } else {
1509                         np = &n->hnext;
1510                 }
1511         }
1512 }
1513
1514 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1515 {
1516         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1517         struct ipoib_neigh_hash *htbl;
1518         struct ipoib_neigh __rcu **buckets;
1519         u32 size;
1520
1521         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1522         ntbl->htbl = NULL;
1523         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1524         if (!htbl)
1525                 return -ENOMEM;
1526         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1527         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1528         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1529         if (!buckets) {
1530                 kfree(htbl);
1531                 return -ENOMEM;
1532         }
1533         htbl->size = size;
1534         htbl->mask = (size - 1);
1535         htbl->buckets = buckets;
1536         RCU_INIT_POINTER(ntbl->htbl, htbl);
1537         htbl->ntbl = ntbl;
1538         atomic_set(&ntbl->entries, 0);
1539
1540         /* start garbage collection */
1541         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1542         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1543                            arp_tbl.gc_interval);
1544
1545         return 0;
1546 }
1547
1548 static void neigh_hash_free_rcu(struct rcu_head *head)
1549 {
1550         struct ipoib_neigh_hash *htbl = container_of(head,
1551                                                     struct ipoib_neigh_hash,
1552                                                     rcu);
1553         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1554         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1555
1556         kfree(buckets);
1557         kfree(htbl);
1558         complete(&ntbl->deleted);
1559 }
1560
1561 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1562 {
1563         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1564         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1565         struct ipoib_neigh_hash *htbl;
1566         unsigned long flags;
1567         int i;
1568
1569         /* remove all neigh connected to a given path or mcast */
1570         spin_lock_irqsave(&priv->lock, flags);
1571
1572         htbl = rcu_dereference_protected(ntbl->htbl,
1573                                          lockdep_is_held(&priv->lock));
1574
1575         if (!htbl)
1576                 goto out_unlock;
1577
1578         for (i = 0; i < htbl->size; i++) {
1579                 struct ipoib_neigh *neigh;
1580                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1581
1582                 while ((neigh = rcu_dereference_protected(*np,
1583                                                           lockdep_is_held(&priv->lock))) != NULL) {
1584                         /* delete neighs belong to this parent */
1585                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1586                                 rcu_assign_pointer(*np,
1587                                                    rcu_dereference_protected(neigh->hnext,
1588                                                                              lockdep_is_held(&priv->lock)));
1589                                 /* remove from parent list */
1590                                 list_del_init(&neigh->list);
1591                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1592                         } else {
1593                                 np = &neigh->hnext;
1594                         }
1595
1596                 }
1597         }
1598 out_unlock:
1599         spin_unlock_irqrestore(&priv->lock, flags);
1600 }
1601
1602 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1603 {
1604         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1605         struct ipoib_neigh_hash *htbl;
1606         unsigned long flags;
1607         int i, wait_flushed = 0;
1608
1609         init_completion(&priv->ntbl.flushed);
1610         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1611
1612         spin_lock_irqsave(&priv->lock, flags);
1613
1614         htbl = rcu_dereference_protected(ntbl->htbl,
1615                                         lockdep_is_held(&priv->lock));
1616         if (!htbl)
1617                 goto out_unlock;
1618
1619         wait_flushed = atomic_read(&priv->ntbl.entries);
1620         if (!wait_flushed)
1621                 goto free_htbl;
1622
1623         for (i = 0; i < htbl->size; i++) {
1624                 struct ipoib_neigh *neigh;
1625                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1626
1627                 while ((neigh = rcu_dereference_protected(*np,
1628                                        lockdep_is_held(&priv->lock))) != NULL) {
1629                         rcu_assign_pointer(*np,
1630                                            rcu_dereference_protected(neigh->hnext,
1631                                                                      lockdep_is_held(&priv->lock)));
1632                         /* remove from path/mc list */
1633                         list_del_init(&neigh->list);
1634                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1635                 }
1636         }
1637
1638 free_htbl:
1639         rcu_assign_pointer(ntbl->htbl, NULL);
1640         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1641
1642 out_unlock:
1643         spin_unlock_irqrestore(&priv->lock, flags);
1644         if (wait_flushed)
1645                 wait_for_completion(&priv->ntbl.flushed);
1646 }
1647
1648 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1649 {
1650         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1651         int stopped;
1652
1653         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1654         init_completion(&priv->ntbl.deleted);
1655
1656         /* Stop GC if called at init fail need to cancel work */
1657         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1658         if (!stopped)
1659                 cancel_delayed_work(&priv->neigh_reap_task);
1660
1661         ipoib_flush_neighs(priv);
1662
1663         wait_for_completion(&priv->ntbl.deleted);
1664 }
1665
1666 static void ipoib_napi_add(struct net_device *dev)
1667 {
1668         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1669
1670         netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
1671         netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
1672 }
1673
1674 static void ipoib_napi_del(struct net_device *dev)
1675 {
1676         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1677
1678         netif_napi_del(&priv->recv_napi);
1679         netif_napi_del(&priv->send_napi);
1680 }
1681
1682 static void ipoib_dev_uninit_default(struct net_device *dev)
1683 {
1684         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1685
1686         ipoib_transport_dev_cleanup(dev);
1687
1688         ipoib_napi_del(dev);
1689
1690         ipoib_cm_dev_cleanup(dev);
1691
1692         kfree(priv->rx_ring);
1693         vfree(priv->tx_ring);
1694
1695         priv->rx_ring = NULL;
1696         priv->tx_ring = NULL;
1697 }
1698
1699 static int ipoib_dev_init_default(struct net_device *dev)
1700 {
1701         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1702
1703         ipoib_napi_add(dev);
1704
1705         /* Allocate RX/TX "rings" to hold queued skbs */
1706         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1707                                 GFP_KERNEL);
1708         if (!priv->rx_ring)
1709                 goto out;
1710
1711         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1712         if (!priv->tx_ring) {
1713                 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1714                         priv->ca->name, ipoib_sendq_size);
1715                 goto out_rx_ring_cleanup;
1716         }
1717
1718         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1719
1720         if (ipoib_transport_dev_init(dev, priv->ca)) {
1721                 pr_warn("%s: ipoib_transport_dev_init failed\n",
1722                         priv->ca->name);
1723                 goto out_tx_ring_cleanup;
1724         }
1725
1726         /* after qp created set dev address */
1727         priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
1728         priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
1729         priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
1730
1731         return 0;
1732
1733 out_tx_ring_cleanup:
1734         vfree(priv->tx_ring);
1735
1736 out_rx_ring_cleanup:
1737         kfree(priv->rx_ring);
1738
1739 out:
1740         ipoib_napi_del(dev);
1741         return -ENOMEM;
1742 }
1743
1744 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1745                        int cmd)
1746 {
1747         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1748
1749         if (!priv->rn_ops->ndo_do_ioctl)
1750                 return -EOPNOTSUPP;
1751
1752         return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
1753 }
1754
1755 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1756 {
1757         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1758         int ret = -ENOMEM;
1759
1760         priv->ca = ca;
1761         priv->port = port;
1762         priv->qp = NULL;
1763
1764         /*
1765          * the various IPoIB tasks assume they will never race against
1766          * themselves, so always use a single thread workqueue
1767          */
1768         priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1769         if (!priv->wq) {
1770                 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1771                 goto out;
1772         }
1773
1774         /* create pd, which used both for control and datapath*/
1775         priv->pd = ib_alloc_pd(priv->ca, 0);
1776         if (IS_ERR(priv->pd)) {
1777                 pr_warn("%s: failed to allocate PD\n", ca->name);
1778                 goto clean_wq;
1779         }
1780
1781         ret = priv->rn_ops->ndo_init(dev);
1782         if (ret) {
1783                 pr_warn("%s failed to init HW resource\n", dev->name);
1784                 goto out_free_pd;
1785         }
1786
1787         if (ipoib_neigh_hash_init(priv) < 0) {
1788                 pr_warn("%s failed to init neigh hash\n", dev->name);
1789                 goto out_dev_uninit;
1790         }
1791
1792         if (dev->flags & IFF_UP) {
1793                 if (ipoib_ib_dev_open(dev)) {
1794                         pr_warn("%s failed to open device\n", dev->name);
1795                         ret = -ENODEV;
1796                         goto out_dev_uninit;
1797                 }
1798         }
1799
1800         return 0;
1801
1802 out_dev_uninit:
1803         ipoib_ib_dev_cleanup(dev);
1804
1805 out_free_pd:
1806         if (priv->pd) {
1807                 ib_dealloc_pd(priv->pd);
1808                 priv->pd = NULL;
1809         }
1810
1811 clean_wq:
1812         if (priv->wq) {
1813                 destroy_workqueue(priv->wq);
1814                 priv->wq = NULL;
1815         }
1816
1817 out:
1818         return ret;
1819 }
1820
1821 void ipoib_dev_cleanup(struct net_device *dev)
1822 {
1823         struct ipoib_dev_priv *priv = ipoib_priv(dev), *cpriv, *tcpriv;
1824         LIST_HEAD(head);
1825
1826         ASSERT_RTNL();
1827
1828         /* Delete any child interfaces first */
1829         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1830                 /* Stop GC on child */
1831                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1832                 cancel_delayed_work(&cpriv->neigh_reap_task);
1833                 unregister_netdevice_queue(cpriv->dev, &head);
1834         }
1835         unregister_netdevice_many(&head);
1836
1837         ipoib_neigh_hash_uninit(dev);
1838
1839         ipoib_ib_dev_cleanup(dev);
1840
1841         /* no more works over the priv->wq */
1842         if (priv->wq) {
1843                 flush_workqueue(priv->wq);
1844                 destroy_workqueue(priv->wq);
1845                 priv->wq = NULL;
1846         }
1847 }
1848
1849 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1850 {
1851         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1852
1853         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1854 }
1855
1856 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1857                                struct ifla_vf_info *ivf)
1858 {
1859         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1860         int err;
1861
1862         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
1863         if (err)
1864                 return err;
1865
1866         ivf->vf = vf;
1867
1868         return 0;
1869 }
1870
1871 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
1872 {
1873         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1874
1875         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
1876                 return -EINVAL;
1877
1878         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
1879 }
1880
1881 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
1882                               struct ifla_vf_stats *vf_stats)
1883 {
1884         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1885
1886         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
1887 }
1888
1889 static const struct header_ops ipoib_header_ops = {
1890         .create = ipoib_hard_header,
1891 };
1892
1893 static const struct net_device_ops ipoib_netdev_ops_pf = {
1894         .ndo_uninit              = ipoib_uninit,
1895         .ndo_open                = ipoib_open,
1896         .ndo_stop                = ipoib_stop,
1897         .ndo_change_mtu          = ipoib_change_mtu,
1898         .ndo_fix_features        = ipoib_fix_features,
1899         .ndo_start_xmit          = ipoib_start_xmit,
1900         .ndo_tx_timeout          = ipoib_timeout,
1901         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1902         .ndo_get_iflink          = ipoib_get_iflink,
1903         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
1904         .ndo_get_vf_config       = ipoib_get_vf_config,
1905         .ndo_get_vf_stats        = ipoib_get_vf_stats,
1906         .ndo_set_vf_guid         = ipoib_set_vf_guid,
1907         .ndo_set_mac_address     = ipoib_set_mac,
1908         .ndo_get_stats64         = ipoib_get_stats,
1909         .ndo_do_ioctl            = ipoib_ioctl,
1910 };
1911
1912 static const struct net_device_ops ipoib_netdev_ops_vf = {
1913         .ndo_uninit              = ipoib_uninit,
1914         .ndo_open                = ipoib_open,
1915         .ndo_stop                = ipoib_stop,
1916         .ndo_change_mtu          = ipoib_change_mtu,
1917         .ndo_fix_features        = ipoib_fix_features,
1918         .ndo_start_xmit          = ipoib_start_xmit,
1919         .ndo_tx_timeout          = ipoib_timeout,
1920         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1921         .ndo_get_iflink          = ipoib_get_iflink,
1922         .ndo_get_stats64         = ipoib_get_stats,
1923         .ndo_do_ioctl            = ipoib_ioctl,
1924 };
1925
1926 void ipoib_setup_common(struct net_device *dev)
1927 {
1928         dev->header_ops          = &ipoib_header_ops;
1929
1930         ipoib_set_ethtool_ops(dev);
1931
1932         dev->watchdog_timeo      = HZ;
1933
1934         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1935
1936         dev->hard_header_len     = IPOIB_HARD_LEN;
1937         dev->addr_len            = INFINIBAND_ALEN;
1938         dev->type                = ARPHRD_INFINIBAND;
1939         dev->tx_queue_len        = ipoib_sendq_size * 2;
1940         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1941                                     NETIF_F_HIGHDMA);
1942         netif_keep_dst(dev);
1943
1944         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1945 }
1946
1947 static void ipoib_build_priv(struct net_device *dev)
1948 {
1949         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1950
1951         priv->dev = dev;
1952         spin_lock_init(&priv->lock);
1953         init_rwsem(&priv->vlan_rwsem);
1954         mutex_init(&priv->mcast_mutex);
1955         mutex_init(&priv->sysfs_mutex);
1956
1957         INIT_LIST_HEAD(&priv->path_list);
1958         INIT_LIST_HEAD(&priv->child_intfs);
1959         INIT_LIST_HEAD(&priv->dead_ahs);
1960         INIT_LIST_HEAD(&priv->multicast_list);
1961
1962         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1963         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1964         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1965         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1966         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1967         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1968         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1969         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1970 }
1971
1972 static const struct net_device_ops ipoib_netdev_default_pf = {
1973         .ndo_init                = ipoib_dev_init_default,
1974         .ndo_uninit              = ipoib_dev_uninit_default,
1975         .ndo_open                = ipoib_ib_dev_open_default,
1976         .ndo_stop                = ipoib_ib_dev_stop_default,
1977 };
1978
1979 static struct net_device
1980 *ipoib_create_netdev_default(struct ib_device *hca,
1981                              const char *name,
1982                              unsigned char name_assign_type,
1983                              void (*setup)(struct net_device *))
1984 {
1985         struct net_device *dev;
1986         struct rdma_netdev *rn;
1987
1988         dev = alloc_netdev((int)sizeof(struct rdma_netdev),
1989                            name,
1990                            name_assign_type, setup);
1991         if (!dev)
1992                 return NULL;
1993
1994         rn = netdev_priv(dev);
1995
1996         rn->send = ipoib_send;
1997         rn->attach_mcast = ipoib_mcast_attach;
1998         rn->detach_mcast = ipoib_mcast_detach;
1999         rn->free_rdma_netdev = free_netdev;
2000         rn->hca = hca;
2001
2002         dev->netdev_ops = &ipoib_netdev_default_pf;
2003
2004         return dev;
2005 }
2006
2007 static struct net_device *ipoib_get_netdev(struct ib_device *hca, u8 port,
2008                                            const char *name)
2009 {
2010         struct net_device *dev;
2011
2012         if (hca->alloc_rdma_netdev) {
2013                 dev = hca->alloc_rdma_netdev(hca, port,
2014                                              RDMA_NETDEV_IPOIB, name,
2015                                              NET_NAME_UNKNOWN,
2016                                              ipoib_setup_common);
2017                 if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP)
2018                         return NULL;
2019         }
2020
2021         if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP)
2022                 dev = ipoib_create_netdev_default(hca, name, NET_NAME_UNKNOWN,
2023                                                   ipoib_setup_common);
2024
2025         return dev;
2026 }
2027
2028 struct ipoib_dev_priv *ipoib_intf_alloc(struct ib_device *hca, u8 port,
2029                                         const char *name)
2030 {
2031         struct net_device *dev;
2032         struct ipoib_dev_priv *priv;
2033         struct rdma_netdev *rn;
2034
2035         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2036         if (!priv)
2037                 return NULL;
2038
2039         dev = ipoib_get_netdev(hca, port, name);
2040         if (!dev)
2041                 goto free_priv;
2042
2043         priv->rn_ops = dev->netdev_ops;
2044
2045         /* fixme : should be after the query_cap */
2046         if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
2047                 dev->netdev_ops = &ipoib_netdev_ops_vf;
2048         else
2049                 dev->netdev_ops = &ipoib_netdev_ops_pf;
2050
2051         rn = netdev_priv(dev);
2052         rn->clnt_priv = priv;
2053         ipoib_build_priv(dev);
2054
2055         return priv;
2056 free_priv:
2057         kfree(priv);
2058         return NULL;
2059 }
2060
2061 static ssize_t show_pkey(struct device *dev,
2062                          struct device_attribute *attr, char *buf)
2063 {
2064         struct net_device *ndev = to_net_dev(dev);
2065         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2066
2067         return sprintf(buf, "0x%04x\n", priv->pkey);
2068 }
2069 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2070
2071 static ssize_t show_umcast(struct device *dev,
2072                            struct device_attribute *attr, char *buf)
2073 {
2074         struct net_device *ndev = to_net_dev(dev);
2075         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2076
2077         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2078 }
2079
2080 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2081 {
2082         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2083
2084         if (umcast_val > 0) {
2085                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2086                 ipoib_warn(priv, "ignoring multicast groups joined directly "
2087                                 "by userspace\n");
2088         } else
2089                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2090 }
2091
2092 static ssize_t set_umcast(struct device *dev,
2093                           struct device_attribute *attr,
2094                           const char *buf, size_t count)
2095 {
2096         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2097
2098         ipoib_set_umcast(to_net_dev(dev), umcast_val);
2099
2100         return count;
2101 }
2102 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
2103
2104 int ipoib_add_umcast_attr(struct net_device *dev)
2105 {
2106         return device_create_file(&dev->dev, &dev_attr_umcast);
2107 }
2108
2109 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2110 {
2111         struct ipoib_dev_priv *child_priv;
2112         struct net_device *netdev = priv->dev;
2113
2114         netif_addr_lock_bh(netdev);
2115
2116         memcpy(&priv->local_gid.global.interface_id,
2117                &gid->global.interface_id,
2118                sizeof(gid->global.interface_id));
2119         memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
2120         clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2121
2122         netif_addr_unlock_bh(netdev);
2123
2124         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2125                 down_read(&priv->vlan_rwsem);
2126                 list_for_each_entry(child_priv, &priv->child_intfs, list)
2127                         set_base_guid(child_priv, gid);
2128                 up_read(&priv->vlan_rwsem);
2129         }
2130 }
2131
2132 static int ipoib_check_lladdr(struct net_device *dev,
2133                               struct sockaddr_storage *ss)
2134 {
2135         union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2136         int ret = 0;
2137
2138         netif_addr_lock_bh(dev);
2139
2140         /* Make sure the QPN, reserved and subnet prefix match the current
2141          * lladdr, it also makes sure the lladdr is unicast.
2142          */
2143         if (memcmp(dev->dev_addr, ss->__data,
2144                    4 + sizeof(gid->global.subnet_prefix)) ||
2145             gid->global.interface_id == 0)
2146                 ret = -EINVAL;
2147
2148         netif_addr_unlock_bh(dev);
2149
2150         return ret;
2151 }
2152
2153 static int ipoib_set_mac(struct net_device *dev, void *addr)
2154 {
2155         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2156         struct sockaddr_storage *ss = addr;
2157         int ret;
2158
2159         if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2160                 return -EBUSY;
2161
2162         ret = ipoib_check_lladdr(dev, ss);
2163         if (ret)
2164                 return ret;
2165
2166         set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2167
2168         queue_work(ipoib_workqueue, &priv->flush_light);
2169
2170         return 0;
2171 }
2172
2173 static ssize_t create_child(struct device *dev,
2174                             struct device_attribute *attr,
2175                             const char *buf, size_t count)
2176 {
2177         int pkey;
2178         int ret;
2179
2180         if (sscanf(buf, "%i", &pkey) != 1)
2181                 return -EINVAL;
2182
2183         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2184                 return -EINVAL;
2185
2186         /*
2187          * Set the full membership bit, so that we join the right
2188          * broadcast group, etc.
2189          */
2190         pkey |= 0x8000;
2191
2192         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2193
2194         return ret ? ret : count;
2195 }
2196 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
2197
2198 static ssize_t delete_child(struct device *dev,
2199                             struct device_attribute *attr,
2200                             const char *buf, size_t count)
2201 {
2202         int pkey;
2203         int ret;
2204
2205         if (sscanf(buf, "%i", &pkey) != 1)
2206                 return -EINVAL;
2207
2208         if (pkey < 0 || pkey > 0xffff)
2209                 return -EINVAL;
2210
2211         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2212
2213         return ret ? ret : count;
2214
2215 }
2216 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
2217
2218 int ipoib_add_pkey_attr(struct net_device *dev)
2219 {
2220         return device_create_file(&dev->dev, &dev_attr_pkey);
2221 }
2222
2223 void ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
2224 {
2225         priv->hca_caps = hca->attrs.device_cap_flags;
2226
2227         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
2228                 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
2229
2230                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
2231                         priv->dev->hw_features |= NETIF_F_TSO;
2232
2233                 priv->dev->features |= priv->dev->hw_features;
2234         }
2235 }
2236
2237 static struct net_device *ipoib_add_port(const char *format,
2238                                          struct ib_device *hca, u8 port)
2239 {
2240         struct ipoib_dev_priv *priv;
2241         struct ib_port_attr attr;
2242         struct rdma_netdev *rn;
2243         int result = -ENOMEM;
2244
2245         priv = ipoib_intf_alloc(hca, port, format);
2246         if (!priv) {
2247                 pr_warn("%s, %d: ipoib_intf_alloc failed\n", hca->name, port);
2248                 goto alloc_mem_failed;
2249         }
2250
2251         SET_NETDEV_DEV(priv->dev, hca->dev.parent);
2252         priv->dev->dev_id = port - 1;
2253
2254         result = ib_query_port(hca, port, &attr);
2255         if (result) {
2256                 pr_warn("%s: ib_query_port %d failed\n", hca->name, port);
2257                 goto device_init_failed;
2258         }
2259
2260         priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
2261
2262         /* MTU will be reset when mcast join happens */
2263         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
2264         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
2265         priv->dev->max_mtu = IPOIB_CM_MTU;
2266
2267         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
2268
2269         result = ib_query_pkey(hca, port, 0, &priv->pkey);
2270         if (result) {
2271                 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
2272                         hca->name, port, result);
2273                 goto device_init_failed;
2274         }
2275
2276         ipoib_set_dev_features(priv, hca);
2277
2278         /*
2279          * Set the full membership bit, so that we join the right
2280          * broadcast group, etc.
2281          */
2282         priv->pkey |= 0x8000;
2283
2284         priv->dev->broadcast[8] = priv->pkey >> 8;
2285         priv->dev->broadcast[9] = priv->pkey & 0xff;
2286
2287         result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
2288         if (result) {
2289                 pr_warn("%s: ib_query_gid port %d failed (ret = %d)\n",
2290                         hca->name, port, result);
2291                 goto device_init_failed;
2292         }
2293
2294         memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
2295                sizeof(union ib_gid));
2296         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2297
2298         result = ipoib_dev_init(priv->dev, hca, port);
2299         if (result) {
2300                 pr_warn("%s: failed to initialize port %d (ret = %d)\n",
2301                         hca->name, port, result);
2302                 goto device_init_failed;
2303         }
2304
2305         INIT_IB_EVENT_HANDLER(&priv->event_handler,
2306                               priv->ca, ipoib_event);
2307         ib_register_event_handler(&priv->event_handler);
2308
2309         /* call event handler to ensure pkey in sync */
2310         queue_work(ipoib_workqueue, &priv->flush_heavy);
2311
2312         result = register_netdev(priv->dev);
2313         if (result) {
2314                 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2315                         hca->name, port, result);
2316                 goto register_failed;
2317         }
2318
2319         result = -ENOMEM;
2320         if (ipoib_cm_add_mode_attr(priv->dev))
2321                 goto sysfs_failed;
2322         if (ipoib_add_pkey_attr(priv->dev))
2323                 goto sysfs_failed;
2324         if (ipoib_add_umcast_attr(priv->dev))
2325                 goto sysfs_failed;
2326         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
2327                 goto sysfs_failed;
2328         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
2329                 goto sysfs_failed;
2330
2331         return priv->dev;
2332
2333 sysfs_failed:
2334         unregister_netdev(priv->dev);
2335
2336 register_failed:
2337         ib_unregister_event_handler(&priv->event_handler);
2338         flush_workqueue(ipoib_workqueue);
2339         /* Stop GC if started before flush */
2340         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2341         cancel_delayed_work(&priv->neigh_reap_task);
2342         flush_workqueue(priv->wq);
2343         ipoib_dev_cleanup(priv->dev);
2344
2345 device_init_failed:
2346         rn = netdev_priv(priv->dev);
2347         rn->free_rdma_netdev(priv->dev);
2348         kfree(priv);
2349
2350 alloc_mem_failed:
2351         return ERR_PTR(result);
2352 }
2353
2354 static void ipoib_add_one(struct ib_device *device)
2355 {
2356         struct list_head *dev_list;
2357         struct net_device *dev;
2358         struct ipoib_dev_priv *priv;
2359         int p;
2360         int count = 0;
2361
2362         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
2363         if (!dev_list)
2364                 return;
2365
2366         INIT_LIST_HEAD(dev_list);
2367
2368         for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
2369                 if (!rdma_protocol_ib(device, p))
2370                         continue;
2371                 dev = ipoib_add_port("ib%d", device, p);
2372                 if (!IS_ERR(dev)) {
2373                         priv = ipoib_priv(dev);
2374                         list_add_tail(&priv->list, dev_list);
2375                         count++;
2376                 }
2377         }
2378
2379         if (!count) {
2380                 kfree(dev_list);
2381                 return;
2382         }
2383
2384         ib_set_client_data(device, &ipoib_client, dev_list);
2385 }
2386
2387 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2388 {
2389         struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2390         struct list_head *dev_list = client_data;
2391
2392         if (!dev_list)
2393                 return;
2394
2395         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2396                 struct rdma_netdev *parent_rn = netdev_priv(priv->dev);
2397
2398                 ib_unregister_event_handler(&priv->event_handler);
2399                 flush_workqueue(ipoib_workqueue);
2400
2401                 /* mark interface in the middle of destruction */
2402                 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags);
2403
2404                 rtnl_lock();
2405                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
2406                 rtnl_unlock();
2407
2408                 /* Stop GC */
2409                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2410                 cancel_delayed_work(&priv->neigh_reap_task);
2411                 flush_workqueue(priv->wq);
2412
2413                 /* Wrap rtnl_lock/unlock with mutex to protect sysfs calls */
2414                 mutex_lock(&priv->sysfs_mutex);
2415                 unregister_netdev(priv->dev);
2416                 mutex_unlock(&priv->sysfs_mutex);
2417
2418                 parent_rn->free_rdma_netdev(priv->dev);
2419
2420                 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
2421                         struct rdma_netdev *child_rn;
2422
2423                         child_rn = netdev_priv(cpriv->dev);
2424                         child_rn->free_rdma_netdev(cpriv->dev);
2425                         kfree(cpriv);
2426                 }
2427
2428                 kfree(priv);
2429         }
2430
2431         kfree(dev_list);
2432 }
2433
2434 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2435 static struct notifier_block ipoib_netdev_notifier = {
2436         .notifier_call = ipoib_netdev_event,
2437 };
2438 #endif
2439
2440 static int __init ipoib_init_module(void)
2441 {
2442         int ret;
2443
2444         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2445         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2446         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2447
2448         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2449         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2450         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2451 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2452         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2453         ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2454 #endif
2455
2456         /*
2457          * When copying small received packets, we only copy from the
2458          * linear data part of the SKB, so we rely on this condition.
2459          */
2460         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2461
2462         ret = ipoib_register_debugfs();
2463         if (ret)
2464                 return ret;
2465
2466         /*
2467          * We create a global workqueue here that is used for all flush
2468          * operations.  However, if you attempt to flush a workqueue
2469          * from a task on that same workqueue, it deadlocks the system.
2470          * We want to be able to flush the tasks associated with a
2471          * specific net device, so we also create a workqueue for each
2472          * netdevice.  We queue up the tasks for that device only on
2473          * its private workqueue, and we only queue up flush events
2474          * on our global flush workqueue.  This avoids the deadlocks.
2475          */
2476         ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush",
2477                                                   WQ_MEM_RECLAIM);
2478         if (!ipoib_workqueue) {
2479                 ret = -ENOMEM;
2480                 goto err_fs;
2481         }
2482
2483         ib_sa_register_client(&ipoib_sa_client);
2484
2485         ret = ib_register_client(&ipoib_client);
2486         if (ret)
2487                 goto err_sa;
2488
2489         ret = ipoib_netlink_init();
2490         if (ret)
2491                 goto err_client;
2492
2493 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2494         register_netdevice_notifier(&ipoib_netdev_notifier);
2495 #endif
2496         return 0;
2497
2498 err_client:
2499         ib_unregister_client(&ipoib_client);
2500
2501 err_sa:
2502         ib_sa_unregister_client(&ipoib_sa_client);
2503         destroy_workqueue(ipoib_workqueue);
2504
2505 err_fs:
2506         ipoib_unregister_debugfs();
2507
2508         return ret;
2509 }
2510
2511 static void __exit ipoib_cleanup_module(void)
2512 {
2513 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2514         unregister_netdevice_notifier(&ipoib_netdev_notifier);
2515 #endif
2516         ipoib_netlink_fini();
2517         ib_unregister_client(&ipoib_client);
2518         ib_sa_unregister_client(&ipoib_sa_client);
2519         ipoib_unregister_debugfs();
2520         destroy_workqueue(ipoib_workqueue);
2521 }
2522
2523 module_init(ipoib_init_module);
2524 module_exit(ipoib_cleanup_module);