drivers/infiniband/ulp/ipoib/ipoib_main.c

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