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 netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 219 {
 220         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 221
 222         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 223                 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 224
 225         return features;
 226 }
 227
 228 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 229 {
 230         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 231         int ret = 0;
 232
 233         /* dev->mtu > 2K ==> connected mode */
 234         if (ipoib_cm_admin_enabled(dev)) {
 235                 if (new_mtu > ipoib_cm_max_mtu(dev))
 236                         return -EINVAL;
 237
 238                 if (new_mtu > priv->mcast_mtu)
 239                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 240                                    priv->mcast_mtu);
 241
 242                 dev->mtu = new_mtu;
 243                 return 0;
 244         }
 245
 246         if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
 247             new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 248                 return -EINVAL;
 249
 250         priv->admin_mtu = new_mtu;
 251
 252         if (priv->mcast_mtu < priv->admin_mtu)
 253                 ipoib_dbg(priv, "MTU must be smaller than the underlying "
 254                                 "link layer MTU - 4 (%u)\n", priv->mcast_mtu);
 255
 256         new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
 257
 258         if (priv->rn_ops->ndo_change_mtu) {
 259                 bool carrier_status = netif_carrier_ok(dev);
 260
 261                 netif_carrier_off(dev);
 262
 263                 /* notify lower level on the real mtu */
 264                 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
 265
 266                 if (carrier_status)
 267                         netif_carrier_on(dev);
 268         } else {
 269                 dev->mtu = new_mtu;
 270         }
 271
 272         return ret;
 273 }
 274
 275 static void ipoib_get_stats(struct net_device *dev,
 276                             struct rtnl_link_stats64 *stats)
 277 {
 278         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 279
 280         if (priv->rn_ops->ndo_get_stats64)
 281                 priv->rn_ops->ndo_get_stats64(dev, stats);
 282         else
 283                 netdev_stats_to_stats64(stats, &dev->stats);
 284 }
 285
 286 /* Called with an RCU read lock taken */
 287 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
 288                                         struct net_device *dev)
 289 {
 290         struct net *net = dev_net(dev);
 291         struct in_device *in_dev;
 292         struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
 293         struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
 294         __be32 ret_addr;
 295
 296         switch (addr->sa_family) {
 297         case AF_INET:
 298                 in_dev = in_dev_get(dev);
 299                 if (!in_dev)
 300                         return false;
 301
 302                 ret_addr = inet_confirm_addr(net, in_dev, 0,
 303                                              addr_in->sin_addr.s_addr,
 304                                              RT_SCOPE_HOST);
 305                 in_dev_put(in_dev);
 306                 if (ret_addr)
 307                         return true;
 308
 309                 break;
 310         case AF_INET6:
 311                 if (IS_ENABLED(CONFIG_IPV6) &&
 312                     ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
 313                         return true;
 314
 315                 break;
 316         }
 317         return false;
 318 }
 319
 320 /**
 321  * Find the master net_device on top of the given net_device.
 322  * @dev: base IPoIB net_device
 323  *
 324  * Returns the master net_device with a reference held, or the same net_device
 325  * if no master exists.
 326  */
 327 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
 328 {
 329         struct net_device *master;
 330
 331         rcu_read_lock();
 332         master = netdev_master_upper_dev_get_rcu(dev);
 333         if (master)
 334                 dev_hold(master);
 335         rcu_read_unlock();
 336
 337         if (master)
 338                 return master;
 339
 340         dev_hold(dev);
 341         return dev;
 342 }
 343
 344 struct ipoib_walk_data {
 345         const struct sockaddr *addr;
 346         struct net_device *result;
 347 };
 348
 349 static int ipoib_upper_walk(struct net_device *upper, void *_data)
 350 {
 351         struct ipoib_walk_data *data = _data;
 352         int ret = 0;
 353
 354         if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
 355                 dev_hold(upper);
 356                 data->result = upper;
 357                 ret = 1;
 358         }
 359
 360         return ret;
 361 }
 362
 363 /**
 364  * Find a net_device matching the given address, which is an upper device of
 365  * the given net_device.
 366  * @addr: IP address to look for.
 367  * @dev: base IPoIB net_device
 368  *
 369  * If found, returns the net_device with a reference held. Otherwise return
 370  * NULL.
 371  */
 372 static struct net_device *ipoib_get_net_dev_match_addr(
 373                 const struct sockaddr *addr, struct net_device *dev)
 374 {
 375         struct ipoib_walk_data data = {
 376                 .addr = addr,
 377         };
 378
 379         rcu_read_lock();
 380         if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
 381                 dev_hold(dev);
 382                 data.result = dev;
 383                 goto out;
 384         }
 385
 386         netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
 387 out:
 388         rcu_read_unlock();
 389         return data.result;
 390 }
 391
 392 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
 393  * pkey_index and address, if one exists.
 394  *
 395  * @found_net_dev: contains a matching net_device if the return value >= 1,
 396  * with a reference held. */
 397 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
 398                                      const union ib_gid *gid,
 399                                      u16 pkey_index,
 400                                      const struct sockaddr *addr,
 401                                      int nesting,
 402                                      struct net_device **found_net_dev)
 403 {
 404         struct ipoib_dev_priv *child_priv;
 405         struct net_device *net_dev = NULL;
 406         int matches = 0;
 407
 408         if (priv->pkey_index == pkey_index &&
 409             (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
 410                 if (!addr) {
 411                         net_dev = ipoib_get_master_net_dev(priv->dev);
 412                 } else {
 413                         /* Verify the net_device matches the IP address, as
 414                          * IPoIB child devices currently share a GID. */
 415                         net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
 416                 }
 417                 if (net_dev) {
 418                         if (!*found_net_dev)
 419                                 *found_net_dev = net_dev;
 420                         else
 421                                 dev_put(net_dev);
 422                         ++matches;
 423                 }
 424         }
 425
 426         /* Check child interfaces */
 427         down_read_nested(&priv->vlan_rwsem, nesting);
 428         list_for_each_entry(child_priv, &priv->child_intfs, list) {
 429                 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
 430                                                     pkey_index, addr,
 431                                                     nesting + 1,
 432                                                     found_net_dev);
 433                 if (matches > 1)
 434                         break;
 435         }
 436         up_read(&priv->vlan_rwsem);
 437
 438         return matches;
 439 }
 440
 441 /* Returns the number of matching net_devs found (between 0 and 2). Also
 442  * return the matching net_device in the @net_dev parameter, holding a
 443  * reference to the net_device, if the number of matches >= 1 */
 444 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
 445                                          u16 pkey_index,
 446                                          const union ib_gid *gid,
 447                                          const struct sockaddr *addr,
 448                                          struct net_device **net_dev)
 449 {
 450         struct ipoib_dev_priv *priv;
 451         int matches = 0;
 452
 453         *net_dev = NULL;
 454
 455         list_for_each_entry(priv, dev_list, list) {
 456                 if (priv->port != port)
 457                         continue;
 458
 459                 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
 460                                                      addr, 0, net_dev);
 461                 if (matches > 1)
 462                         break;
 463         }
 464
 465         return matches;
 466 }
 467
 468 static struct net_device *ipoib_get_net_dev_by_params(
 469                 struct ib_device *dev, u8 port, u16 pkey,
 470                 const union ib_gid *gid, const struct sockaddr *addr,
 471                 void *client_data)
 472 {
 473         struct net_device *net_dev;
 474         struct list_head *dev_list = client_data;
 475         u16 pkey_index;
 476         int matches;
 477         int ret;
 478
 479         if (!rdma_protocol_ib(dev, port))
 480                 return NULL;
 481
 482         ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
 483         if (ret)
 484                 return NULL;
 485
 486         if (!dev_list)
 487                 return NULL;
 488
 489         /* See if we can find a unique device matching the L2 parameters */
 490         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 491                                                 gid, NULL, &net_dev);
 492
 493         switch (matches) {
 494         case 0:
 495                 return NULL;
 496         case 1:
 497                 return net_dev;
 498         }
 499
 500         dev_put(net_dev);
 501
 502         /* Couldn't find a unique device with L2 parameters only. Use L3
 503          * address to uniquely match the net device */
 504         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 505                                                 gid, addr, &net_dev);
 506         switch (matches) {
 507         case 0:
 508                 return NULL;
 509         default:
 510                 dev_warn_ratelimited(&dev->dev,
 511                                      "duplicate IP address detected\n");
 512                 /* Fall through */
 513         case 1:
 514                 return net_dev;
 515         }
 516 }
 517
 518 int ipoib_set_mode(struct net_device *dev, const char *buf)
 519 {
 520         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 521
 522         if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
 523              !strcmp(buf, "connected\n")) ||
 524              (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
 525              !strcmp(buf, "datagram\n"))) {
 526                 return 0;
 527         }
 528
 529         /* flush paths if we switch modes so that connections are restarted */
 530         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
 531                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 532                 ipoib_warn(priv, "enabling connected mode "
 533                            "will cause multicast packet drops\n");
 534                 netdev_update_features(dev);
 535                 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
 536                 rtnl_unlock();
 537                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 538
 539                 ipoib_flush_paths(dev);
 540                 return (!rtnl_trylock()) ? -EBUSY : 0;
 541         }
 542
 543         if (!strcmp(buf, "datagram\n")) {
 544                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 545                 netdev_update_features(dev);
 546                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 547                 rtnl_unlock();
 548                 ipoib_flush_paths(dev);
 549                 return (!rtnl_trylock()) ? -EBUSY : 0;
 550         }
 551
 552         return -EINVAL;
 553 }
 554
 555 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 556 {
 557         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 558         struct rb_node *n = priv->path_tree.rb_node;
 559         struct ipoib_path *path;
 560         int ret;
 561
 562         while (n) {
 563                 path = rb_entry(n, struct ipoib_path, rb_node);
 564
 565                 ret = memcmp(gid, path->pathrec.dgid.raw,
 566                              sizeof (union ib_gid));
 567
 568                 if (ret < 0)
 569                         n = n->rb_left;
 570                 else if (ret > 0)
 571                         n = n->rb_right;
 572                 else
 573                         return path;
 574         }
 575
 576         return NULL;
 577 }
 578
 579 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 580 {
 581         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 582         struct rb_node **n = &priv->path_tree.rb_node;
 583         struct rb_node *pn = NULL;
 584         struct ipoib_path *tpath;
 585         int ret;
 586
 587         while (*n) {
 588                 pn = *n;
 589                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 590
 591                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 592                              sizeof (union ib_gid));
 593                 if (ret < 0)
 594                         n = &pn->rb_left;
 595                 else if (ret > 0)
 596                         n = &pn->rb_right;
 597                 else
 598                         return -EEXIST;
 599         }
 600
 601         rb_link_node(&path->rb_node, pn, n);
 602         rb_insert_color(&path->rb_node, &priv->path_tree);
 603
 604         list_add_tail(&path->list, &priv->path_list);
 605
 606         return 0;
 607 }
 608
 609 static void path_free(struct net_device *dev, struct ipoib_path *path)
 610 {
 611         struct sk_buff *skb;
 612
 613         while ((skb = __skb_dequeue(&path->queue)))
 614                 dev_kfree_skb_irq(skb);
 615
 616         ipoib_dbg(ipoib_priv(dev), "path_free\n");
 617
 618         /* remove all neigh connected to this path */
 619         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 620
 621         if (path->ah)
 622                 ipoib_put_ah(path->ah);
 623
 624         kfree(path);
 625 }
 626
 627 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 628
 629 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 630 {
 631         struct ipoib_path_iter *iter;
 632
 633         iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 634         if (!iter)
 635                 return NULL;
 636
 637         iter->dev = dev;
 638         memset(iter->path.pathrec.dgid.raw, 0, 16);
 639
 640         if (ipoib_path_iter_next(iter)) {
 641                 kfree(iter);
 642                 return NULL;
 643         }
 644
 645         return iter;
 646 }
 647
 648 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 649 {
 650         struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
 651         struct rb_node *n;
 652         struct ipoib_path *path;
 653         int ret = 1;
 654
 655         spin_lock_irq(&priv->lock);
 656
 657         n = rb_first(&priv->path_tree);
 658
 659         while (n) {
 660                 path = rb_entry(n, struct ipoib_path, rb_node);
 661
 662                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 663                            sizeof (union ib_gid)) < 0) {
 664                         iter->path = *path;
 665                         ret = 0;
 666                         break;
 667                 }
 668
 669                 n = rb_next(n);
 670         }
 671
 672         spin_unlock_irq(&priv->lock);
 673
 674         return ret;
 675 }
 676
 677 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 678                           struct ipoib_path *path)
 679 {
 680         *path = iter->path;
 681 }
 682
 683 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 684
 685 void ipoib_mark_paths_invalid(struct net_device *dev)
 686 {
 687         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 688         struct ipoib_path *path, *tp;
 689
 690         spin_lock_irq(&priv->lock);
 691
 692         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 693                 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
 694                           be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
 695                           path->pathrec.dgid.raw);
 696                 if (path->ah)
 697                         path->ah->valid = 0;
 698         }
 699
 700         spin_unlock_irq(&priv->lock);
 701 }
 702
 703 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
 704 {
 705         struct ipoib_pseudo_header *phdr;
 706
 707         phdr = skb_push(skb, sizeof(*phdr));
 708         memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 709 }
 710
 711 void ipoib_flush_paths(struct net_device *dev)
 712 {
 713         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 714         struct ipoib_path *path, *tp;
 715         LIST_HEAD(remove_list);
 716         unsigned long flags;
 717
 718         netif_tx_lock_bh(dev);
 719         spin_lock_irqsave(&priv->lock, flags);
 720
 721         list_splice_init(&priv->path_list, &remove_list);
 722
 723         list_for_each_entry(path, &remove_list, list)
 724                 rb_erase(&path->rb_node, &priv->path_tree);
 725
 726         list_for_each_entry_safe(path, tp, &remove_list, list) {
 727                 if (path->query)
 728                         ib_sa_cancel_query(path->query_id, path->query);
 729                 spin_unlock_irqrestore(&priv->lock, flags);
 730                 netif_tx_unlock_bh(dev);
 731                 wait_for_completion(&path->done);
 732                 path_free(dev, path);
 733                 netif_tx_lock_bh(dev);
 734                 spin_lock_irqsave(&priv->lock, flags);
 735         }
 736
 737         spin_unlock_irqrestore(&priv->lock, flags);
 738         netif_tx_unlock_bh(dev);
 739 }
 740
 741 static void path_rec_completion(int status,
 742                                 struct sa_path_rec *pathrec,
 743                                 void *path_ptr)
 744 {
 745         struct ipoib_path *path = path_ptr;
 746         struct net_device *dev = path->dev;
 747         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 748         struct ipoib_ah *ah = NULL;
 749         struct ipoib_ah *old_ah = NULL;
 750         struct ipoib_neigh *neigh, *tn;
 751         struct sk_buff_head skqueue;
 752         struct sk_buff *skb;
 753         unsigned long flags;
 754
 755         if (!status)
 756                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 757                           be32_to_cpu(sa_path_get_dlid(pathrec)),
 758                           pathrec->dgid.raw);
 759         else
 760                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 761                           status, path->pathrec.dgid.raw);
 762
 763         skb_queue_head_init(&skqueue);
 764
 765         if (!status) {
 766                 struct rdma_ah_attr av;
 767
 768                 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
 769                                                pathrec, &av, NULL)) {
 770                         ah = ipoib_create_ah(dev, priv->pd, &av);
 771                         rdma_destroy_ah_attr(&av);
 772                 }
 773         }
 774
 775         spin_lock_irqsave(&priv->lock, flags);
 776
 777         if (!IS_ERR_OR_NULL(ah)) {
 778                 /*
 779                  * pathrec.dgid is used as the database key from the LLADDR,
 780                  * it must remain unchanged even if the SA returns a different
 781                  * GID to use in the AH.
 782                  */
 783                 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
 784                            sizeof(union ib_gid))) {
 785                         ipoib_dbg(
 786                                 priv,
 787                                 "%s got PathRec for gid %pI6 while asked for %pI6\n",
 788                                 dev->name, pathrec->dgid.raw,
 789                                 path->pathrec.dgid.raw);
 790                         memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
 791                                sizeof(union ib_gid));
 792                 }
 793
 794                 path->pathrec = *pathrec;
 795
 796                 old_ah   = path->ah;
 797                 path->ah = ah;
 798
 799                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 800                           ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
 801                           pathrec->sl);
 802
 803                 while ((skb = __skb_dequeue(&path->queue)))
 804                         __skb_queue_tail(&skqueue, skb);
 805
 806                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 807                         if (neigh->ah) {
 808                                 WARN_ON(neigh->ah != old_ah);
 809                                 /*
 810                                  * Dropping the ah reference inside
 811                                  * priv->lock is safe here, because we
 812                                  * will hold one more reference from
 813                                  * the original value of path->ah (ie
 814                                  * old_ah).
 815                                  */
 816                                 ipoib_put_ah(neigh->ah);
 817                         }
 818                         kref_get(&path->ah->ref);
 819                         neigh->ah = path->ah;
 820
 821                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 822                                 if (!ipoib_cm_get(neigh))
 823                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 824                                                                                path,
 825                                                                                neigh));
 826                                 if (!ipoib_cm_get(neigh)) {
 827                                         ipoib_neigh_free(neigh);
 828                                         continue;
 829                                 }
 830                         }
 831
 832                         while ((skb = __skb_dequeue(&neigh->queue)))
 833                                 __skb_queue_tail(&skqueue, skb);
 834                 }
 835                 path->ah->valid = 1;
 836         }
 837
 838         path->query = NULL;
 839         complete(&path->done);
 840
 841         spin_unlock_irqrestore(&priv->lock, flags);
 842
 843         if (IS_ERR_OR_NULL(ah))
 844                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 845
 846         if (old_ah)
 847                 ipoib_put_ah(old_ah);
 848
 849         while ((skb = __skb_dequeue(&skqueue))) {
 850                 int ret;
 851                 skb->dev = dev;
 852                 ret = dev_queue_xmit(skb);
 853                 if (ret)
 854                         ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
 855                                    __func__, ret);
 856         }
 857 }
 858
 859 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
 860                           void *gid)
 861 {
 862         path->dev = priv->dev;
 863
 864         if (rdma_cap_opa_ah(priv->ca, priv->port))
 865                 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
 866         else
 867                 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
 868
 869         memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
 870         path->pathrec.sgid          = priv->local_gid;
 871         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 872         path->pathrec.numb_path     = 1;
 873         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 874 }
 875
 876 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 877 {
 878         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 879         struct ipoib_path *path;
 880
 881         if (!priv->broadcast)
 882                 return NULL;
 883
 884         path = kzalloc(sizeof(*path), GFP_ATOMIC);
 885         if (!path)
 886                 return NULL;
 887
 888         skb_queue_head_init(&path->queue);
 889
 890         INIT_LIST_HEAD(&path->neigh_list);
 891
 892         init_path_rec(priv, path, gid);
 893
 894         return path;
 895 }
 896
 897 static int path_rec_start(struct net_device *dev,
 898                           struct ipoib_path *path)
 899 {
 900         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 901
 902         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 903                   path->pathrec.dgid.raw);
 904
 905         init_completion(&path->done);
 906
 907         path->query_id =
 908                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 909                                    &path->pathrec,
 910                                    IB_SA_PATH_REC_DGID          |
 911                                    IB_SA_PATH_REC_SGID          |
 912                                    IB_SA_PATH_REC_NUMB_PATH     |
 913                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 914                                    IB_SA_PATH_REC_PKEY,
 915                                    1000, GFP_ATOMIC,
 916                                    path_rec_completion,
 917                                    path, &path->query);
 918         if (path->query_id < 0) {
 919                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 920                 path->query = NULL;
 921                 complete(&path->done);
 922                 return path->query_id;
 923         }
 924
 925         return 0;
 926 }
 927
 928 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
 929                                struct net_device *dev)
 930 {
 931         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 932         struct ipoib_path *path;
 933         unsigned long flags;
 934
 935         spin_lock_irqsave(&priv->lock, flags);
 936
 937         path = __path_find(dev, daddr + 4);
 938         if (!path)
 939                 goto out;
 940         if (!path->query)
 941                 path_rec_start(dev, path);
 942 out:
 943         spin_unlock_irqrestore(&priv->lock, flags);
 944 }
 945
 946 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
 947                                           struct net_device *dev)
 948 {
 949         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 950         struct rdma_netdev *rn = netdev_priv(dev);
 951         struct ipoib_path *path;
 952         struct ipoib_neigh *neigh;
 953         unsigned long flags;
 954
 955         spin_lock_irqsave(&priv->lock, flags);
 956         neigh = ipoib_neigh_alloc(daddr, dev);
 957         if (!neigh) {
 958                 spin_unlock_irqrestore(&priv->lock, flags);
 959                 ++dev->stats.tx_dropped;
 960                 dev_kfree_skb_any(skb);
 961                 return NULL;
 962         }
 963
 964         /* To avoid race condition, make sure that the
 965          * neigh will be added only once.
 966          */
 967         if (unlikely(!list_empty(&neigh->list))) {
 968                 spin_unlock_irqrestore(&priv->lock, flags);
 969                 return neigh;
 970         }
 971
 972         path = __path_find(dev, daddr + 4);
 973         if (!path) {
 974                 path = path_rec_create(dev, daddr + 4);
 975                 if (!path)
 976                         goto err_path;
 977
 978                 __path_add(dev, path);
 979         }
 980
 981         list_add_tail(&neigh->list, &path->neigh_list);
 982
 983         if (path->ah && path->ah->valid) {
 984                 kref_get(&path->ah->ref);
 985                 neigh->ah = path->ah;
 986
 987                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 988                         if (!ipoib_cm_get(neigh))
 989                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 990                         if (!ipoib_cm_get(neigh)) {
 991                                 ipoib_neigh_free(neigh);
 992                                 goto err_drop;
 993                         }
 994                         if (skb_queue_len(&neigh->queue) <
 995                             IPOIB_MAX_PATH_REC_QUEUE) {
 996                                 push_pseudo_header(skb, neigh->daddr);
 997                                 __skb_queue_tail(&neigh->queue, skb);
 998                         } else {
 999                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
1000                                            skb_queue_len(&neigh->queue));
1001                                 goto err_drop;
1002                         }
1003                 } else {
1004                         spin_unlock_irqrestore(&priv->lock, flags);
1005                         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1006                                                        IPOIB_QPN(daddr));
1007                         ipoib_neigh_put(neigh);
1008                         return NULL;
1009                 }
1010         } else {
1011                 neigh->ah  = NULL;
1012
1013                 if (!path->query && path_rec_start(dev, path))
1014                         goto err_path;
1015                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1016                         push_pseudo_header(skb, neigh->daddr);
1017                         __skb_queue_tail(&neigh->queue, skb);
1018                 } else {
1019                         goto err_drop;
1020                 }
1021         }
1022
1023         spin_unlock_irqrestore(&priv->lock, flags);
1024         ipoib_neigh_put(neigh);
1025         return NULL;
1026
1027 err_path:
1028         ipoib_neigh_free(neigh);
1029 err_drop:
1030         ++dev->stats.tx_dropped;
1031         dev_kfree_skb_any(skb);
1032
1033         spin_unlock_irqrestore(&priv->lock, flags);
1034         ipoib_neigh_put(neigh);
1035
1036         return NULL;
1037 }
1038
1039 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1040                              struct ipoib_pseudo_header *phdr)
1041 {
1042         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1043         struct rdma_netdev *rn = netdev_priv(dev);
1044         struct ipoib_path *path;
1045         unsigned long flags;
1046
1047         spin_lock_irqsave(&priv->lock, flags);
1048
1049         /* no broadcast means that all paths are (going to be) not valid */
1050         if (!priv->broadcast)
1051                 goto drop_and_unlock;
1052
1053         path = __path_find(dev, phdr->hwaddr + 4);
1054         if (!path || !path->ah || !path->ah->valid) {
1055                 if (!path) {
1056                         path = path_rec_create(dev, phdr->hwaddr + 4);
1057                         if (!path)
1058                                 goto drop_and_unlock;
1059                         __path_add(dev, path);
1060                 } else {
1061                         /*
1062                          * make sure there are no changes in the existing
1063                          * path record
1064                          */
1065                         init_path_rec(priv, path, phdr->hwaddr + 4);
1066                 }
1067                 if (!path->query && path_rec_start(dev, path)) {
1068                         goto drop_and_unlock;
1069                 }
1070
1071                 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1072                         push_pseudo_header(skb, phdr->hwaddr);
1073                         __skb_queue_tail(&path->queue, skb);
1074                         goto unlock;
1075                 } else {
1076                         goto drop_and_unlock;
1077                 }
1078         }
1079
1080         spin_unlock_irqrestore(&priv->lock, flags);
1081         ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1082                   be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1083         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1084                                        IPOIB_QPN(phdr->hwaddr));
1085         return;
1086
1087 drop_and_unlock:
1088         ++dev->stats.tx_dropped;
1089         dev_kfree_skb_any(skb);
1090 unlock:
1091         spin_unlock_irqrestore(&priv->lock, flags);
1092 }
1093
1094 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1095 {
1096         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1097         struct rdma_netdev *rn = netdev_priv(dev);
1098         struct ipoib_neigh *neigh;
1099         struct ipoib_pseudo_header *phdr;
1100         struct ipoib_header *header;
1101         unsigned long flags;
1102
1103         phdr = (struct ipoib_pseudo_header *) skb->data;
1104         skb_pull(skb, sizeof(*phdr));
1105         header = (struct ipoib_header *) skb->data;
1106
1107         if (unlikely(phdr->hwaddr[4] == 0xff)) {
1108                 /* multicast, arrange "if" according to probability */
1109                 if ((header->proto != htons(ETH_P_IP)) &&
1110                     (header->proto != htons(ETH_P_IPV6)) &&
1111                     (header->proto != htons(ETH_P_ARP)) &&
1112                     (header->proto != htons(ETH_P_RARP)) &&
1113                     (header->proto != htons(ETH_P_TIPC))) {
1114                         /* ethertype not supported by IPoIB */
1115                         ++dev->stats.tx_dropped;
1116                         dev_kfree_skb_any(skb);
1117                         return NETDEV_TX_OK;
1118                 }
1119                 /* Add in the P_Key for multicast*/
1120                 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1121                 phdr->hwaddr[9] = priv->pkey & 0xff;
1122
1123                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1124                 if (likely(neigh))
1125                         goto send_using_neigh;
1126                 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1127                 return NETDEV_TX_OK;
1128         }
1129
1130         /* unicast, arrange "switch" according to probability */
1131         switch (header->proto) {
1132         case htons(ETH_P_IP):
1133         case htons(ETH_P_IPV6):
1134         case htons(ETH_P_TIPC):
1135                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1136                 if (unlikely(!neigh)) {
1137                         neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1138                         if (likely(!neigh))
1139                                 return NETDEV_TX_OK;
1140                 }
1141                 break;
1142         case htons(ETH_P_ARP):
1143         case htons(ETH_P_RARP):
1144                 /* for unicast ARP and RARP should always perform path find */
1145                 unicast_arp_send(skb, dev, phdr);
1146                 return NETDEV_TX_OK;
1147         default:
1148                 /* ethertype not supported by IPoIB */
1149                 ++dev->stats.tx_dropped;
1150                 dev_kfree_skb_any(skb);
1151                 return NETDEV_TX_OK;
1152         }
1153
1154 send_using_neigh:
1155         /* note we now hold a ref to neigh */
1156         if (ipoib_cm_get(neigh)) {
1157                 if (ipoib_cm_up(neigh)) {
1158                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1159                         goto unref;
1160                 }
1161         } else if (neigh->ah && neigh->ah->valid) {
1162                 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1163                                                 IPOIB_QPN(phdr->hwaddr));
1164                 goto unref;
1165         } else if (neigh->ah) {
1166                 neigh_refresh_path(neigh, phdr->hwaddr, dev);
1167         }
1168
1169         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1170                 push_pseudo_header(skb, phdr->hwaddr);
1171                 spin_lock_irqsave(&priv->lock, flags);
1172                 __skb_queue_tail(&neigh->queue, skb);
1173                 spin_unlock_irqrestore(&priv->lock, flags);
1174         } else {
1175                 ++dev->stats.tx_dropped;
1176                 dev_kfree_skb_any(skb);
1177         }
1178
1179 unref:
1180         ipoib_neigh_put(neigh);
1181
1182         return NETDEV_TX_OK;
1183 }
1184
1185 static void ipoib_timeout(struct net_device *dev)
1186 {
1187         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1188
1189         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1190                    jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1191         ipoib_warn(priv,
1192                    "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n",
1193                    netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
1194                    priv->global_tx_head, priv->global_tx_tail);
1195
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,
1203                              const void *saddr,
1204                              unsigned int len)
1205 {
1206         struct ipoib_header *header;
1207
1208         header = skb_push(skb, sizeof(*header));
1209
1210         header->proto = htons(type);
1211         header->reserved = 0;
1212
1213         /*
1214          * we don't rely on dst_entry structure,  always stuff the
1215          * destination address into skb hard header so we can figure out where
1216          * to send the packet later.
1217          */
1218         push_pseudo_header(skb, daddr);
1219
1220         return IPOIB_HARD_LEN;
1221 }
1222
1223 static void ipoib_set_mcast_list(struct net_device *dev)
1224 {
1225         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1226
1227         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1228                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1229                 return;
1230         }
1231
1232         queue_work(priv->wq, &priv->restart_task);
1233 }
1234
1235 static int ipoib_get_iflink(const struct net_device *dev)
1236 {
1237         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1238
1239         /* parent interface */
1240         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1241                 return dev->ifindex;
1242
1243         /* child/vlan interface */
1244         return priv->parent->ifindex;
1245 }
1246
1247 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1248 {
1249         /*
1250          * Use only the address parts that contributes to spreading
1251          * The subnet prefix is not used as one can not connect to
1252          * same remote port (GUID) using the same remote QPN via two
1253          * different subnets.
1254          */
1255          /* qpn octets[1:4) & port GUID octets[12:20) */
1256         u32 *d32 = (u32 *) daddr;
1257         u32 hv;
1258
1259         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1260         return hv & htbl->mask;
1261 }
1262
1263 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1264 {
1265         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1266         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1267         struct ipoib_neigh_hash *htbl;
1268         struct ipoib_neigh *neigh = NULL;
1269         u32 hash_val;
1270
1271         rcu_read_lock_bh();
1272
1273         htbl = rcu_dereference_bh(ntbl->htbl);
1274
1275         if (!htbl)
1276                 goto out_unlock;
1277
1278         hash_val = ipoib_addr_hash(htbl, daddr);
1279         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1280              neigh != NULL;
1281              neigh = rcu_dereference_bh(neigh->hnext)) {
1282                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1283                         /* found, take one ref on behalf of the caller */
1284                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1285                                 /* deleted */
1286                                 neigh = NULL;
1287                                 goto out_unlock;
1288                         }
1289
1290                         if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1291                                 neigh->alive = jiffies;
1292                         goto out_unlock;
1293                 }
1294         }
1295
1296 out_unlock:
1297         rcu_read_unlock_bh();
1298         return neigh;
1299 }
1300
1301 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1302 {
1303         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1304         struct ipoib_neigh_hash *htbl;
1305         unsigned long neigh_obsolete;
1306         unsigned long dt;
1307         unsigned long flags;
1308         int i;
1309         LIST_HEAD(remove_list);
1310
1311         spin_lock_irqsave(&priv->lock, flags);
1312
1313         htbl = rcu_dereference_protected(ntbl->htbl,
1314                                          lockdep_is_held(&priv->lock));
1315
1316         if (!htbl)
1317                 goto out_unlock;
1318
1319         /* neigh is obsolete if it was idle for two GC periods */
1320         dt = 2 * arp_tbl.gc_interval;
1321         neigh_obsolete = jiffies - dt;
1322
1323         for (i = 0; i < htbl->size; i++) {
1324                 struct ipoib_neigh *neigh;
1325                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1326
1327                 while ((neigh = rcu_dereference_protected(*np,
1328                                                           lockdep_is_held(&priv->lock))) != NULL) {
1329                         /* was the neigh idle for two GC periods */
1330                         if (time_after(neigh_obsolete, neigh->alive)) {
1331
1332                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1333
1334                                 rcu_assign_pointer(*np,
1335                                                    rcu_dereference_protected(neigh->hnext,
1336                                                                              lockdep_is_held(&priv->lock)));
1337                                 /* remove from path/mc list */
1338                                 list_del_init(&neigh->list);
1339                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1340                         } else {
1341                                 np = &neigh->hnext;
1342                         }
1343
1344                 }
1345         }
1346
1347 out_unlock:
1348         spin_unlock_irqrestore(&priv->lock, flags);
1349         ipoib_mcast_remove_list(&remove_list);
1350 }
1351
1352 static void ipoib_reap_neigh(struct work_struct *work)
1353 {
1354         struct ipoib_dev_priv *priv =
1355                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1356
1357         __ipoib_reap_neigh(priv);
1358
1359         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1360                            arp_tbl.gc_interval);
1361 }
1362
1363
1364 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1365                                       struct net_device *dev)
1366 {
1367         struct ipoib_neigh *neigh;
1368
1369         neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
1370         if (!neigh)
1371                 return NULL;
1372
1373         neigh->dev = dev;
1374         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1375         skb_queue_head_init(&neigh->queue);
1376         INIT_LIST_HEAD(&neigh->list);
1377         ipoib_cm_set(neigh, NULL);
1378         /* one ref on behalf of the caller */
1379         atomic_set(&neigh->refcnt, 1);
1380
1381         return neigh;
1382 }
1383
1384 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1385                                       struct net_device *dev)
1386 {
1387         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1388         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1389         struct ipoib_neigh_hash *htbl;
1390         struct ipoib_neigh *neigh;
1391         u32 hash_val;
1392
1393         htbl = rcu_dereference_protected(ntbl->htbl,
1394                                          lockdep_is_held(&priv->lock));
1395         if (!htbl) {
1396                 neigh = NULL;
1397                 goto out_unlock;
1398         }
1399
1400         /* need to add a new neigh, but maybe some other thread succeeded?
1401          * recalc hash, maybe hash resize took place so we do a search
1402          */
1403         hash_val = ipoib_addr_hash(htbl, daddr);
1404         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1405                                                lockdep_is_held(&priv->lock));
1406              neigh != NULL;
1407              neigh = rcu_dereference_protected(neigh->hnext,
1408                                                lockdep_is_held(&priv->lock))) {
1409                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1410                         /* found, take one ref on behalf of the caller */
1411                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1412                                 /* deleted */
1413                                 neigh = NULL;
1414                                 break;
1415                         }
1416                         neigh->alive = jiffies;
1417                         goto out_unlock;
1418                 }
1419         }
1420
1421         neigh = ipoib_neigh_ctor(daddr, dev);
1422         if (!neigh)
1423                 goto out_unlock;
1424
1425         /* one ref on behalf of the hash table */
1426         atomic_inc(&neigh->refcnt);
1427         neigh->alive = jiffies;
1428         /* put in hash */
1429         rcu_assign_pointer(neigh->hnext,
1430                            rcu_dereference_protected(htbl->buckets[hash_val],
1431                                                      lockdep_is_held(&priv->lock)));
1432         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1433         atomic_inc(&ntbl->entries);
1434
1435 out_unlock:
1436
1437         return neigh;
1438 }
1439
1440 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1441 {
1442         /* neigh reference count was dropprd to zero */
1443         struct net_device *dev = neigh->dev;
1444         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1445         struct sk_buff *skb;
1446         if (neigh->ah)
1447                 ipoib_put_ah(neigh->ah);
1448         while ((skb = __skb_dequeue(&neigh->queue))) {
1449                 ++dev->stats.tx_dropped;
1450                 dev_kfree_skb_any(skb);
1451         }
1452         if (ipoib_cm_get(neigh))
1453                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1454         ipoib_dbg(ipoib_priv(dev),
1455                   "neigh free for %06x %pI6\n",
1456                   IPOIB_QPN(neigh->daddr),
1457                   neigh->daddr + 4);
1458         kfree(neigh);
1459         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1460                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1461                         complete(&priv->ntbl.flushed);
1462         }
1463 }
1464
1465 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1466 {
1467         /* Called as a result of removal from hash table */
1468         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1469         /* note TX context may hold another ref */
1470         ipoib_neigh_put(neigh);
1471 }
1472
1473 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1474 {
1475         struct net_device *dev = neigh->dev;
1476         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1477         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1478         struct ipoib_neigh_hash *htbl;
1479         struct ipoib_neigh __rcu **np;
1480         struct ipoib_neigh *n;
1481         u32 hash_val;
1482
1483         htbl = rcu_dereference_protected(ntbl->htbl,
1484                                         lockdep_is_held(&priv->lock));
1485         if (!htbl)
1486                 return;
1487
1488         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1489         np = &htbl->buckets[hash_val];
1490         for (n = rcu_dereference_protected(*np,
1491                                             lockdep_is_held(&priv->lock));
1492              n != NULL;
1493              n = rcu_dereference_protected(*np,
1494                                         lockdep_is_held(&priv->lock))) {
1495                 if (n == neigh) {
1496                         /* found */
1497                         rcu_assign_pointer(*np,
1498                                            rcu_dereference_protected(neigh->hnext,
1499                                                                      lockdep_is_held(&priv->lock)));
1500                         /* remove from parent list */
1501                         list_del_init(&neigh->list);
1502                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1503                         return;
1504                 } else {
1505                         np = &n->hnext;
1506                 }
1507         }
1508 }
1509
1510 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1511 {
1512         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1513         struct ipoib_neigh_hash *htbl;
1514         struct ipoib_neigh __rcu **buckets;
1515         u32 size;
1516
1517         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1518         ntbl->htbl = NULL;
1519         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1520         if (!htbl)
1521                 return -ENOMEM;
1522         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1523         buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
1524         if (!buckets) {
1525                 kfree(htbl);
1526                 return -ENOMEM;
1527         }
1528         htbl->size = size;
1529         htbl->mask = (size - 1);
1530         htbl->buckets = buckets;
1531         RCU_INIT_POINTER(ntbl->htbl, htbl);
1532         htbl->ntbl = ntbl;
1533         atomic_set(&ntbl->entries, 0);
1534
1535         /* start garbage collection */
1536         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1537                            arp_tbl.gc_interval);
1538
1539         return 0;
1540 }
1541
1542 static void neigh_hash_free_rcu(struct rcu_head *head)
1543 {
1544         struct ipoib_neigh_hash *htbl = container_of(head,
1545                                                     struct ipoib_neigh_hash,
1546                                                     rcu);
1547         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1548         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1549
1550         kvfree(buckets);
1551         kfree(htbl);
1552         complete(&ntbl->deleted);
1553 }
1554
1555 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1556 {
1557         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1558         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1559         struct ipoib_neigh_hash *htbl;
1560         unsigned long flags;
1561         int i;
1562
1563         /* remove all neigh connected to a given path or mcast */
1564         spin_lock_irqsave(&priv->lock, flags);
1565
1566         htbl = rcu_dereference_protected(ntbl->htbl,
1567                                          lockdep_is_held(&priv->lock));
1568
1569         if (!htbl)
1570                 goto out_unlock;
1571
1572         for (i = 0; i < htbl->size; i++) {
1573                 struct ipoib_neigh *neigh;
1574                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1575
1576                 while ((neigh = rcu_dereference_protected(*np,
1577                                                           lockdep_is_held(&priv->lock))) != NULL) {
1578                         /* delete neighs belong to this parent */
1579                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1580                                 rcu_assign_pointer(*np,
1581                                                    rcu_dereference_protected(neigh->hnext,
1582                                                                              lockdep_is_held(&priv->lock)));
1583                                 /* remove from parent list */
1584                                 list_del_init(&neigh->list);
1585                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1586                         } else {
1587                                 np = &neigh->hnext;
1588                         }
1589
1590                 }
1591         }
1592 out_unlock:
1593         spin_unlock_irqrestore(&priv->lock, flags);
1594 }
1595
1596 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1597 {
1598         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1599         struct ipoib_neigh_hash *htbl;
1600         unsigned long flags;
1601         int i, wait_flushed = 0;
1602
1603         init_completion(&priv->ntbl.flushed);
1604         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1605
1606         spin_lock_irqsave(&priv->lock, flags);
1607
1608         htbl = rcu_dereference_protected(ntbl->htbl,
1609                                         lockdep_is_held(&priv->lock));
1610         if (!htbl)
1611                 goto out_unlock;
1612
1613         wait_flushed = atomic_read(&priv->ntbl.entries);
1614         if (!wait_flushed)
1615                 goto free_htbl;
1616
1617         for (i = 0; i < htbl->size; i++) {
1618                 struct ipoib_neigh *neigh;
1619                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1620
1621                 while ((neigh = rcu_dereference_protected(*np,
1622                                        lockdep_is_held(&priv->lock))) != NULL) {
1623                         rcu_assign_pointer(*np,
1624                                            rcu_dereference_protected(neigh->hnext,
1625                                                                      lockdep_is_held(&priv->lock)));
1626                         /* remove from path/mc list */
1627                         list_del_init(&neigh->list);
1628                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1629                 }
1630         }
1631
1632 free_htbl:
1633         rcu_assign_pointer(ntbl->htbl, NULL);
1634         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1635
1636 out_unlock:
1637         spin_unlock_irqrestore(&priv->lock, flags);
1638         if (wait_flushed)
1639                 wait_for_completion(&priv->ntbl.flushed);
1640 }
1641
1642 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1643 {
1644         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1645
1646         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1647         init_completion(&priv->ntbl.deleted);
1648
1649         cancel_delayed_work_sync(&priv->neigh_reap_task);
1650
1651         ipoib_flush_neighs(priv);
1652
1653         wait_for_completion(&priv->ntbl.deleted);
1654 }
1655
1656 static void ipoib_napi_add(struct net_device *dev)
1657 {
1658         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1659
1660         netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
1661         netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
1662 }
1663
1664 static void ipoib_napi_del(struct net_device *dev)
1665 {
1666         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1667
1668         netif_napi_del(&priv->recv_napi);
1669         netif_napi_del(&priv->send_napi);
1670 }
1671
1672 static void ipoib_dev_uninit_default(struct net_device *dev)
1673 {
1674         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1675
1676         ipoib_transport_dev_cleanup(dev);
1677
1678         ipoib_napi_del(dev);
1679
1680         ipoib_cm_dev_cleanup(dev);
1681
1682         kfree(priv->rx_ring);
1683         vfree(priv->tx_ring);
1684
1685         priv->rx_ring = NULL;
1686         priv->tx_ring = NULL;
1687 }
1688
1689 static int ipoib_dev_init_default(struct net_device *dev)
1690 {
1691         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1692
1693         ipoib_napi_add(dev);
1694
1695         /* Allocate RX/TX "rings" to hold queued skbs */
1696         priv->rx_ring = kcalloc(ipoib_recvq_size,
1697                                        sizeof(*priv->rx_ring),
1698                                        GFP_KERNEL);
1699         if (!priv->rx_ring)
1700                 goto out;
1701
1702         priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1703                                            sizeof(*priv->tx_ring)));
1704         if (!priv->tx_ring) {
1705                 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1706                         priv->ca->name, ipoib_sendq_size);
1707                 goto out_rx_ring_cleanup;
1708         }
1709
1710         /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */
1711
1712         if (ipoib_transport_dev_init(dev, priv->ca)) {
1713                 pr_warn("%s: ipoib_transport_dev_init failed\n",
1714                         priv->ca->name);
1715                 goto out_tx_ring_cleanup;
1716         }
1717
1718         /* after qp created set dev address */
1719         priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
1720         priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
1721         priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
1722
1723         return 0;
1724
1725 out_tx_ring_cleanup:
1726         vfree(priv->tx_ring);
1727
1728 out_rx_ring_cleanup:
1729         kfree(priv->rx_ring);
1730
1731 out:
1732         ipoib_napi_del(dev);
1733         return -ENOMEM;
1734 }
1735
1736 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1737                        int cmd)
1738 {
1739         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1740
1741         if (!priv->rn_ops->ndo_do_ioctl)
1742                 return -EOPNOTSUPP;
1743
1744         return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
1745 }
1746
1747 static int ipoib_dev_init(struct net_device *dev)
1748 {
1749         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1750         int ret = -ENOMEM;
1751
1752         priv->qp = NULL;
1753
1754         /*
1755          * the various IPoIB tasks assume they will never race against
1756          * themselves, so always use a single thread workqueue
1757          */
1758         priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1759         if (!priv->wq) {
1760                 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1761                 goto out;
1762         }
1763
1764         /* create pd, which used both for control and datapath*/
1765         priv->pd = ib_alloc_pd(priv->ca, 0);
1766         if (IS_ERR(priv->pd)) {
1767                 pr_warn("%s: failed to allocate PD\n", priv->ca->name);
1768                 goto clean_wq;
1769         }
1770
1771         ret = priv->rn_ops->ndo_init(dev);
1772         if (ret) {
1773                 pr_warn("%s failed to init HW resource\n", dev->name);
1774                 goto out_free_pd;
1775         }
1776
1777         ret = ipoib_neigh_hash_init(priv);
1778         if (ret) {
1779                 pr_warn("%s failed to init neigh hash\n", dev->name);
1780                 goto out_dev_uninit;
1781         }
1782
1783         if (dev->flags & IFF_UP) {
1784                 if (ipoib_ib_dev_open(dev)) {
1785                         pr_warn("%s failed to open device\n", dev->name);
1786                         ret = -ENODEV;
1787                         goto out_hash_uninit;
1788                 }
1789         }
1790
1791         return 0;
1792
1793 out_hash_uninit:
1794         ipoib_neigh_hash_uninit(dev);
1795
1796 out_dev_uninit:
1797         ipoib_ib_dev_cleanup(dev);
1798
1799 out_free_pd:
1800         if (priv->pd) {
1801                 ib_dealloc_pd(priv->pd);
1802                 priv->pd = NULL;
1803         }
1804
1805 clean_wq:
1806         if (priv->wq) {
1807                 destroy_workqueue(priv->wq);
1808                 priv->wq = NULL;
1809         }
1810
1811 out:
1812         return ret;
1813 }
1814
1815 /*
1816  * This must be called before doing an unregister_netdev on a parent device to
1817  * shutdown the IB event handler.
1818  */
1819 static void ipoib_parent_unregister_pre(struct net_device *ndev)
1820 {
1821         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1822
1823         /*
1824          * ipoib_set_mac checks netif_running before pushing work, clearing
1825          * running ensures the it will not add more work.
1826          */
1827         rtnl_lock();
1828         dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1829         rtnl_unlock();
1830
1831         /* ipoib_event() cannot be running once this returns */
1832         ib_unregister_event_handler(&priv->event_handler);
1833
1834         /*
1835          * Work on the queue grabs the rtnl lock, so this cannot be done while
1836          * also holding it.
1837          */
1838         flush_workqueue(ipoib_workqueue);
1839 }
1840
1841 static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
1842 {
1843         priv->hca_caps = priv->ca->attrs.device_cap_flags;
1844
1845         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1846                 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1847
1848                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1849                         priv->dev->hw_features |= NETIF_F_TSO;
1850
1851                 priv->dev->features |= priv->dev->hw_features;
1852         }
1853 }
1854
1855 static int ipoib_parent_init(struct net_device *ndev)
1856 {
1857         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1858         struct ib_port_attr attr;
1859         int result;
1860
1861         result = ib_query_port(priv->ca, priv->port, &attr);
1862         if (result) {
1863                 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
1864                         priv->port);
1865                 return result;
1866         }
1867         priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1868
1869         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1870         if (result) {
1871                 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
1872                         priv->ca->name, priv->port, result);
1873                 return result;
1874         }
1875
1876         result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
1877         if (result) {
1878                 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
1879                         priv->ca->name, priv->port, result);
1880                 return result;
1881         }
1882         memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
1883                sizeof(union ib_gid));
1884
1885         SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
1886         priv->dev->dev_port = priv->port - 1;
1887         /* Let's set this one too for backwards compatibility. */
1888         priv->dev->dev_id = priv->port - 1;
1889
1890         return 0;
1891 }
1892
1893 static void ipoib_child_init(struct net_device *ndev)
1894 {
1895         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1896         struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1897
1898         priv->max_ib_mtu = ppriv->max_ib_mtu;
1899         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
1900         memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
1901         memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
1902 }
1903
1904 static int ipoib_ndo_init(struct net_device *ndev)
1905 {
1906         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1907         int rc;
1908
1909         if (priv->parent) {
1910                 ipoib_child_init(ndev);
1911         } else {
1912                 rc = ipoib_parent_init(ndev);
1913                 if (rc)
1914                         return rc;
1915         }
1916
1917         /* MTU will be reset when mcast join happens */
1918         ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1919         priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
1920         ndev->max_mtu = IPOIB_CM_MTU;
1921
1922         ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
1923
1924         /*
1925          * Set the full membership bit, so that we join the right
1926          * broadcast group, etc.
1927          */
1928         priv->pkey |= 0x8000;
1929
1930         ndev->broadcast[8] = priv->pkey >> 8;
1931         ndev->broadcast[9] = priv->pkey & 0xff;
1932         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1933
1934         ipoib_set_dev_features(priv);
1935
1936         rc = ipoib_dev_init(ndev);
1937         if (rc) {
1938                 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
1939                         priv->ca->name, priv->dev->name, priv->port, rc);
1940                 return rc;
1941         }
1942
1943         if (priv->parent) {
1944                 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1945
1946                 dev_hold(priv->parent);
1947
1948                 down_write(&ppriv->vlan_rwsem);
1949                 list_add_tail(&priv->list, &ppriv->child_intfs);
1950                 up_write(&ppriv->vlan_rwsem);
1951         }
1952
1953         return 0;
1954 }
1955
1956 static void ipoib_ndo_uninit(struct net_device *dev)
1957 {
1958         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1959
1960         ASSERT_RTNL();
1961
1962         /*
1963          * ipoib_remove_one guarantees the children are removed before the
1964          * parent, and that is the only place where a parent can be removed.
1965          */
1966         WARN_ON(!list_empty(&priv->child_intfs));
1967
1968         if (priv->parent) {
1969                 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1970
1971                 down_write(&ppriv->vlan_rwsem);
1972                 list_del(&priv->list);
1973                 up_write(&ppriv->vlan_rwsem);
1974         }
1975
1976         ipoib_neigh_hash_uninit(dev);
1977
1978         ipoib_ib_dev_cleanup(dev);
1979
1980         /* no more works over the priv->wq */
1981         if (priv->wq) {
1982                 /* See ipoib_mcast_carrier_on_task() */
1983                 WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags));
1984                 flush_workqueue(priv->wq);
1985                 destroy_workqueue(priv->wq);
1986                 priv->wq = NULL;
1987         }
1988
1989         if (priv->parent)
1990                 dev_put(priv->parent);
1991 }
1992
1993 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1994 {
1995         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1996
1997         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1998 }
1999
2000 static int ipoib_get_vf_config(struct net_device *dev, int vf,
2001                                struct ifla_vf_info *ivf)
2002 {
2003         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2004         int err;
2005
2006         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
2007         if (err)
2008                 return err;
2009
2010         ivf->vf = vf;
2011         memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
2012
2013         return 0;
2014 }
2015
2016 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
2017 {
2018         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2019
2020         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
2021                 return -EINVAL;
2022
2023         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
2024 }
2025
2026 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
2027                               struct ifla_vf_stats *vf_stats)
2028 {
2029         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2030
2031         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
2032 }
2033
2034 static const struct header_ops ipoib_header_ops = {
2035         .create = ipoib_hard_header,
2036 };
2037
2038 static const struct net_device_ops ipoib_netdev_ops_pf = {
2039         .ndo_init                = ipoib_ndo_init,
2040         .ndo_uninit              = ipoib_ndo_uninit,
2041         .ndo_open                = ipoib_open,
2042         .ndo_stop                = ipoib_stop,
2043         .ndo_change_mtu          = ipoib_change_mtu,
2044         .ndo_fix_features        = ipoib_fix_features,
2045         .ndo_start_xmit          = ipoib_start_xmit,
2046         .ndo_tx_timeout          = ipoib_timeout,
2047         .ndo_set_rx_mode         = ipoib_set_mcast_list,
2048         .ndo_get_iflink          = ipoib_get_iflink,
2049         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
2050         .ndo_get_vf_config       = ipoib_get_vf_config,
2051         .ndo_get_vf_stats        = ipoib_get_vf_stats,
2052         .ndo_set_vf_guid         = ipoib_set_vf_guid,
2053         .ndo_set_mac_address     = ipoib_set_mac,
2054         .ndo_get_stats64         = ipoib_get_stats,
2055         .ndo_do_ioctl            = ipoib_ioctl,
2056 };
2057
2058 static const struct net_device_ops ipoib_netdev_ops_vf = {
2059         .ndo_init                = ipoib_ndo_init,
2060         .ndo_uninit              = ipoib_ndo_uninit,
2061         .ndo_open                = ipoib_open,
2062         .ndo_stop                = ipoib_stop,
2063         .ndo_change_mtu          = ipoib_change_mtu,
2064         .ndo_fix_features        = ipoib_fix_features,
2065         .ndo_start_xmit          = ipoib_start_xmit,
2066         .ndo_tx_timeout          = ipoib_timeout,
2067         .ndo_set_rx_mode         = ipoib_set_mcast_list,
2068         .ndo_get_iflink          = ipoib_get_iflink,
2069         .ndo_get_stats64         = ipoib_get_stats,
2070         .ndo_do_ioctl            = ipoib_ioctl,
2071 };
2072
2073 void ipoib_setup_common(struct net_device *dev)
2074 {
2075         dev->header_ops          = &ipoib_header_ops;
2076
2077         ipoib_set_ethtool_ops(dev);
2078
2079         dev->watchdog_timeo      = HZ;
2080
2081         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
2082
2083         dev->hard_header_len     = IPOIB_HARD_LEN;
2084         dev->addr_len            = INFINIBAND_ALEN;
2085         dev->type                = ARPHRD_INFINIBAND;
2086         dev->tx_queue_len        = ipoib_sendq_size * 2;
2087         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
2088                                     NETIF_F_HIGHDMA);
2089         netif_keep_dst(dev);
2090
2091         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
2092
2093         /*
2094          * unregister_netdev always frees the netdev, we use this mode
2095          * consistently to unify all the various unregister paths, including
2096          * those connected to rtnl_link_ops which require it.
2097          */
2098         dev->needs_free_netdev = true;
2099 }
2100
2101 static void ipoib_build_priv(struct net_device *dev)
2102 {
2103         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2104
2105         priv->dev = dev;
2106         spin_lock_init(&priv->lock);
2107         init_rwsem(&priv->vlan_rwsem);
2108         mutex_init(&priv->mcast_mutex);
2109
2110         INIT_LIST_HEAD(&priv->path_list);
2111         INIT_LIST_HEAD(&priv->child_intfs);
2112         INIT_LIST_HEAD(&priv->dead_ahs);
2113         INIT_LIST_HEAD(&priv->multicast_list);
2114
2115         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
2116         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
2117         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
2118         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
2119         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
2120         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
2121         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
2122         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
2123 }
2124
2125 static const struct net_device_ops ipoib_netdev_default_pf = {
2126         .ndo_init                = ipoib_dev_init_default,
2127         .ndo_uninit              = ipoib_dev_uninit_default,
2128         .ndo_open                = ipoib_ib_dev_open_default,
2129         .ndo_stop                = ipoib_ib_dev_stop_default,
2130 };
2131
2132 static struct net_device
2133 *ipoib_create_netdev_default(struct ib_device *hca,
2134                              const char *name,
2135                              unsigned char name_assign_type,
2136                              void (*setup)(struct net_device *))
2137 {
2138         struct net_device *dev;
2139         struct rdma_netdev *rn;
2140
2141         dev = alloc_netdev((int)sizeof(struct rdma_netdev),
2142                            name,
2143                            name_assign_type, setup);
2144         if (!dev)
2145                 return NULL;
2146
2147         rn = netdev_priv(dev);
2148
2149         rn->send = ipoib_send;
2150         rn->attach_mcast = ipoib_mcast_attach;
2151         rn->detach_mcast = ipoib_mcast_detach;
2152         rn->hca = hca;
2153         dev->netdev_ops = &ipoib_netdev_default_pf;
2154
2155         return dev;
2156 }
2157
2158 static struct net_device *ipoib_get_netdev(struct ib_device *hca, u8 port,
2159                                            const char *name)
2160 {
2161         struct net_device *dev;
2162
2163         if (hca->alloc_rdma_netdev) {
2164                 dev = hca->alloc_rdma_netdev(hca, port,
2165                                              RDMA_NETDEV_IPOIB, name,
2166                                              NET_NAME_UNKNOWN,
2167                                              ipoib_setup_common);
2168                 if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP)
2169                         return NULL;
2170         }
2171
2172         if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP)
2173                 dev = ipoib_create_netdev_default(hca, name, NET_NAME_UNKNOWN,
2174                                                   ipoib_setup_common);
2175
2176         return dev;
2177 }
2178
2179 struct ipoib_dev_priv *ipoib_intf_alloc(struct ib_device *hca, u8 port,
2180                                         const char *name)
2181 {
2182         struct net_device *dev;
2183         struct ipoib_dev_priv *priv;
2184         struct rdma_netdev *rn;
2185
2186         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2187         if (!priv)
2188                 return NULL;
2189
2190         priv->ca = hca;
2191         priv->port = port;
2192
2193         dev = ipoib_get_netdev(hca, port, name);
2194         if (!dev)
2195                 goto free_priv;
2196
2197         priv->rn_ops = dev->netdev_ops;
2198
2199         /* fixme : should be after the query_cap */
2200         if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
2201                 dev->netdev_ops = &ipoib_netdev_ops_vf;
2202         else
2203                 dev->netdev_ops = &ipoib_netdev_ops_pf;
2204
2205         rn = netdev_priv(dev);
2206         rn->clnt_priv = priv;
2207
2208         /*
2209          * Only the child register_netdev flows can handle priv_destructor
2210          * being set, so we force it to NULL here and handle manually until it
2211          * is safe to turn on.
2212          */
2213         priv->next_priv_destructor = dev->priv_destructor;
2214         dev->priv_destructor = NULL;
2215
2216         ipoib_build_priv(dev);
2217
2218         return priv;
2219 free_priv:
2220         kfree(priv);
2221         return NULL;
2222 }
2223
2224 void ipoib_intf_free(struct net_device *dev)
2225 {
2226         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2227         struct rdma_netdev *rn = netdev_priv(dev);
2228
2229         dev->priv_destructor = priv->next_priv_destructor;
2230         if (dev->priv_destructor)
2231                 dev->priv_destructor(dev);
2232
2233         /*
2234          * There are some error flows around register_netdev failing that may
2235          * attempt to call priv_destructor twice, prevent that from happening.
2236          */
2237         dev->priv_destructor = NULL;
2238
2239         /* unregister/destroy is very complicated. Make bugs more obvious. */
2240         rn->clnt_priv = NULL;
2241
2242         kfree(priv);
2243 }
2244
2245 static ssize_t show_pkey(struct device *dev,
2246                          struct device_attribute *attr, char *buf)
2247 {
2248         struct net_device *ndev = to_net_dev(dev);
2249         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2250
2251         return sprintf(buf, "0x%04x\n", priv->pkey);
2252 }
2253 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2254
2255 static ssize_t show_umcast(struct device *dev,
2256                            struct device_attribute *attr, char *buf)
2257 {
2258         struct net_device *ndev = to_net_dev(dev);
2259         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2260
2261         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2262 }
2263
2264 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2265 {
2266         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2267
2268         if (umcast_val > 0) {
2269                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2270                 ipoib_warn(priv, "ignoring multicast groups joined directly "
2271                                 "by userspace\n");
2272         } else
2273                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2274 }
2275
2276 static ssize_t set_umcast(struct device *dev,
2277                           struct device_attribute *attr,
2278                           const char *buf, size_t count)
2279 {
2280         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2281
2282         ipoib_set_umcast(to_net_dev(dev), umcast_val);
2283
2284         return count;
2285 }
2286 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
2287
2288 int ipoib_add_umcast_attr(struct net_device *dev)
2289 {
2290         return device_create_file(&dev->dev, &dev_attr_umcast);
2291 }
2292
2293 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2294 {
2295         struct ipoib_dev_priv *child_priv;
2296         struct net_device *netdev = priv->dev;
2297
2298         netif_addr_lock_bh(netdev);
2299
2300         memcpy(&priv->local_gid.global.interface_id,
2301                &gid->global.interface_id,
2302                sizeof(gid->global.interface_id));
2303         memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
2304         clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2305
2306         netif_addr_unlock_bh(netdev);
2307
2308         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2309                 down_read(&priv->vlan_rwsem);
2310                 list_for_each_entry(child_priv, &priv->child_intfs, list)
2311                         set_base_guid(child_priv, gid);
2312                 up_read(&priv->vlan_rwsem);
2313         }
2314 }
2315
2316 static int ipoib_check_lladdr(struct net_device *dev,
2317                               struct sockaddr_storage *ss)
2318 {
2319         union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2320         int ret = 0;
2321
2322         netif_addr_lock_bh(dev);
2323
2324         /* Make sure the QPN, reserved and subnet prefix match the current
2325          * lladdr, it also makes sure the lladdr is unicast.
2326          */
2327         if (memcmp(dev->dev_addr, ss->__data,
2328                    4 + sizeof(gid->global.subnet_prefix)) ||
2329             gid->global.interface_id == 0)
2330                 ret = -EINVAL;
2331
2332         netif_addr_unlock_bh(dev);
2333
2334         return ret;
2335 }
2336
2337 static int ipoib_set_mac(struct net_device *dev, void *addr)
2338 {
2339         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2340         struct sockaddr_storage *ss = addr;
2341         int ret;
2342
2343         if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2344                 return -EBUSY;
2345
2346         ret = ipoib_check_lladdr(dev, ss);
2347         if (ret)
2348                 return ret;
2349
2350         set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2351
2352         queue_work(ipoib_workqueue, &priv->flush_light);
2353
2354         return 0;
2355 }
2356
2357 static ssize_t create_child(struct device *dev,
2358                             struct device_attribute *attr,
2359                             const char *buf, size_t count)
2360 {
2361         int pkey;
2362         int ret;
2363
2364         if (sscanf(buf, "%i", &pkey) != 1)
2365                 return -EINVAL;
2366
2367         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2368                 return -EINVAL;
2369
2370         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2371
2372         return ret ? ret : count;
2373 }
2374 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
2375
2376 static ssize_t delete_child(struct device *dev,
2377                             struct device_attribute *attr,
2378                             const char *buf, size_t count)
2379 {
2380         int pkey;
2381         int ret;
2382
2383         if (sscanf(buf, "%i", &pkey) != 1)
2384                 return -EINVAL;
2385
2386         if (pkey < 0 || pkey > 0xffff)
2387                 return -EINVAL;
2388
2389         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2390
2391         return ret ? ret : count;
2392
2393 }
2394 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
2395
2396 int ipoib_add_pkey_attr(struct net_device *dev)
2397 {
2398         return device_create_file(&dev->dev, &dev_attr_pkey);
2399 }
2400
2401 static struct net_device *ipoib_add_port(const char *format,
2402                                          struct ib_device *hca, u8 port)
2403 {
2404         struct ipoib_dev_priv *priv;
2405         struct net_device *ndev;
2406         int result;
2407
2408         priv = ipoib_intf_alloc(hca, port, format);
2409         if (!priv) {
2410                 pr_warn("%s, %d: ipoib_intf_alloc failed\n", hca->name, port);
2411                 return ERR_PTR(-ENOMEM);
2412         }
2413         ndev = priv->dev;
2414
2415         INIT_IB_EVENT_HANDLER(&priv->event_handler,
2416                               priv->ca, ipoib_event);
2417         ib_register_event_handler(&priv->event_handler);
2418
2419         /* call event handler to ensure pkey in sync */
2420         queue_work(ipoib_workqueue, &priv->flush_heavy);
2421
2422         result = register_netdev(ndev);
2423         if (result) {
2424                 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2425                         hca->name, port, result);
2426
2427                 ipoib_parent_unregister_pre(ndev);
2428                 ipoib_intf_free(ndev);
2429                 free_netdev(ndev);
2430
2431                 return ERR_PTR(result);
2432         }
2433
2434         /*
2435          * We cannot set priv_destructor before register_netdev because we
2436          * need priv to be always valid during the error flow to execute
2437          * ipoib_parent_unregister_pre(). Instead handle it manually and only
2438          * enter priv_destructor mode once we are completely registered.
2439          */
2440         ndev->priv_destructor = ipoib_intf_free;
2441
2442         if (ipoib_cm_add_mode_attr(ndev))
2443                 goto sysfs_failed;
2444         if (ipoib_add_pkey_attr(ndev))
2445                 goto sysfs_failed;
2446         if (ipoib_add_umcast_attr(ndev))
2447                 goto sysfs_failed;
2448         if (device_create_file(&ndev->dev, &dev_attr_create_child))
2449                 goto sysfs_failed;
2450         if (device_create_file(&ndev->dev, &dev_attr_delete_child))
2451                 goto sysfs_failed;
2452
2453         return ndev;
2454
2455 sysfs_failed:
2456         ipoib_parent_unregister_pre(ndev);
2457         unregister_netdev(ndev);
2458         return ERR_PTR(-ENOMEM);
2459 }
2460
2461 static void ipoib_add_one(struct ib_device *device)
2462 {
2463         struct list_head *dev_list;
2464         struct net_device *dev;
2465         struct ipoib_dev_priv *priv;
2466         int p;
2467         int count = 0;
2468
2469         dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
2470         if (!dev_list)
2471                 return;
2472
2473         INIT_LIST_HEAD(dev_list);
2474
2475         for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
2476                 if (!rdma_protocol_ib(device, p))
2477                         continue;
2478                 dev = ipoib_add_port("ib%d", device, p);
2479                 if (!IS_ERR(dev)) {
2480                         priv = ipoib_priv(dev);
2481                         list_add_tail(&priv->list, dev_list);
2482                         count++;
2483                 }
2484         }
2485
2486         if (!count) {
2487                 kfree(dev_list);
2488                 return;
2489         }
2490
2491         ib_set_client_data(device, &ipoib_client, dev_list);
2492 }
2493
2494 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2495 {
2496         struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2497         struct list_head *dev_list = client_data;
2498
2499         if (!dev_list)
2500                 return;
2501
2502         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2503                 LIST_HEAD(head);
2504                 ipoib_parent_unregister_pre(priv->dev);
2505
2506                 rtnl_lock();
2507
2508                 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
2509                                          list)
2510                         unregister_netdevice_queue(cpriv->dev, &head);
2511                 unregister_netdevice_queue(priv->dev, &head);
2512                 unregister_netdevice_many(&head);
2513
2514                 rtnl_unlock();
2515         }
2516
2517         kfree(dev_list);
2518 }
2519
2520 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2521 static struct notifier_block ipoib_netdev_notifier = {
2522         .notifier_call = ipoib_netdev_event,
2523 };
2524 #endif
2525
2526 static int __init ipoib_init_module(void)
2527 {
2528         int ret;
2529
2530         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2531         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2532         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2533
2534         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2535         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2536         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2537 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2538         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2539         ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2540 #endif
2541
2542         /*
2543          * When copying small received packets, we only copy from the
2544          * linear data part of the SKB, so we rely on this condition.
2545          */
2546         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2547
2548         ret = ipoib_register_debugfs();
2549         if (ret)
2550                 return ret;
2551
2552         /*
2553          * We create a global workqueue here that is used for all flush
2554          * operations.  However, if you attempt to flush a workqueue
2555          * from a task on that same workqueue, it deadlocks the system.
2556          * We want to be able to flush the tasks associated with a
2557          * specific net device, so we also create a workqueue for each
2558          * netdevice.  We queue up the tasks for that device only on
2559          * its private workqueue, and we only queue up flush events
2560          * on our global flush workqueue.  This avoids the deadlocks.
2561          */
2562         ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
2563         if (!ipoib_workqueue) {
2564                 ret = -ENOMEM;
2565                 goto err_fs;
2566         }
2567
2568         ib_sa_register_client(&ipoib_sa_client);
2569
2570         ret = ib_register_client(&ipoib_client);
2571         if (ret)
2572                 goto err_sa;
2573
2574         ret = ipoib_netlink_init();
2575         if (ret)
2576                 goto err_client;
2577
2578 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2579         register_netdevice_notifier(&ipoib_netdev_notifier);
2580 #endif
2581         return 0;
2582
2583 err_client:
2584         ib_unregister_client(&ipoib_client);
2585
2586 err_sa:
2587         ib_sa_unregister_client(&ipoib_sa_client);
2588         destroy_workqueue(ipoib_workqueue);
2589
2590 err_fs:
2591         ipoib_unregister_debugfs();
2592
2593         return ret;
2594 }
2595
2596 static void __exit ipoib_cleanup_module(void)
2597 {
2598 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2599         unregister_netdevice_notifier(&ipoib_netdev_notifier);
2600 #endif
2601         ipoib_netlink_fini();
2602         ib_unregister_client(&ipoib_client);
2603         ib_sa_unregister_client(&ipoib_sa_client);
2604         ipoib_unregister_debugfs();
2605         destroy_workqueue(ipoib_workqueue);
2606 }
2607
2608 module_init(ipoib_init_module);
2609 module_exit(ipoib_cleanup_module);