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 MODULE_AUTHOR("Roland Dreier");
  56 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  57 MODULE_LICENSE("Dual BSD/GPL");
  58
  59 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  60 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  61
  62 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  63 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  64 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  65 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  66
  67 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  68 int ipoib_debug_level;
  69
  70 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  71 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  72 #endif
  73
  74 struct ipoib_path_iter {
  75         struct net_device *dev;
  76         struct ipoib_path  path;
  77 };
  78
  79 static const u8 ipv4_bcast_addr[] = {
  80         0x00, 0xff, 0xff, 0xff,
  81         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  82         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  83 };
  84
  85 struct workqueue_struct *ipoib_workqueue;
  86
  87 struct ib_sa_client ipoib_sa_client;
  88
  89 static int ipoib_add_one(struct ib_device *device);
  90 static void ipoib_remove_one(struct ib_device *device, void *client_data);
  91 static void ipoib_neigh_reclaim(struct rcu_head *rp);
  92 static struct net_device *ipoib_get_net_dev_by_params(
  93                 struct ib_device *dev, u32 port, u16 pkey,
  94                 const union ib_gid *gid, const struct sockaddr *addr,
  95                 void *client_data);
  96 static int ipoib_set_mac(struct net_device *dev, void *addr);
  97 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
  98                        int cmd);
  99
 100 static struct ib_client ipoib_client = {
 101         .name   = "ipoib",
 102         .add    = ipoib_add_one,
 103         .remove = ipoib_remove_one,
 104         .get_net_dev_by_params = ipoib_get_net_dev_by_params,
 105 };
 106
 107 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 108 static int ipoib_netdev_event(struct notifier_block *this,
 109                               unsigned long event, void *ptr)
 110 {
 111         struct netdev_notifier_info *ni = ptr;
 112         struct net_device *dev = ni->dev;
 113
 114         if (dev->netdev_ops->ndo_open != ipoib_open)
 115                 return NOTIFY_DONE;
 116
 117         switch (event) {
 118         case NETDEV_REGISTER:
 119                 ipoib_create_debug_files(dev);
 120                 break;
 121         case NETDEV_CHANGENAME:
 122                 ipoib_delete_debug_files(dev);
 123                 ipoib_create_debug_files(dev);
 124                 break;
 125         case NETDEV_UNREGISTER:
 126                 ipoib_delete_debug_files(dev);
 127                 break;
 128         }
 129
 130         return NOTIFY_DONE;
 131 }
 132 #endif
 133
 134 int ipoib_open(struct net_device *dev)
 135 {
 136         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 137
 138         ipoib_dbg(priv, "bringing up interface\n");
 139
 140         netif_carrier_off(dev);
 141
 142         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 143
 144         if (ipoib_ib_dev_open(dev)) {
 145                 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 146                         return 0;
 147                 goto err_disable;
 148         }
 149
 150         ipoib_ib_dev_up(dev);
 151
 152         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 153                 struct ipoib_dev_priv *cpriv;
 154
 155                 /* Bring up any child interfaces too */
 156                 down_read(&priv->vlan_rwsem);
 157                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 158                         int flags;
 159
 160                         flags = cpriv->dev->flags;
 161                         if (flags & IFF_UP)
 162                                 continue;
 163
 164                         dev_change_flags(cpriv->dev, flags | IFF_UP, NULL);
 165                 }
 166                 up_read(&priv->vlan_rwsem);
 167         } else if (priv->parent) {
 168                 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
 169
 170                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &ppriv->flags))
 171                         ipoib_dbg(priv, "parent device %s is not up, so child device may be not functioning.\n",
 172                                   ppriv->dev->name);
 173         }
 174         netif_start_queue(dev);
 175
 176         return 0;
 177
 178 err_disable:
 179         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 180
 181         return -EINVAL;
 182 }
 183
 184 static int ipoib_stop(struct net_device *dev)
 185 {
 186         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 187
 188         ipoib_dbg(priv, "stopping interface\n");
 189
 190         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 191
 192         netif_stop_queue(dev);
 193
 194         ipoib_ib_dev_down(dev);
 195         ipoib_ib_dev_stop(dev);
 196
 197         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 198                 struct ipoib_dev_priv *cpriv;
 199
 200                 /* Bring down any child interfaces too */
 201                 down_read(&priv->vlan_rwsem);
 202                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 203                         int flags;
 204
 205                         flags = cpriv->dev->flags;
 206                         if (!(flags & IFF_UP))
 207                                 continue;
 208
 209                         dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL);
 210                 }
 211                 up_read(&priv->vlan_rwsem);
 212         }
 213
 214         return 0;
 215 }
 216
 217 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 218 {
 219         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 220
 221         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 222                 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 223
 224         return features;
 225 }
 226
 227 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 228 {
 229         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 230         int ret = 0;
 231
 232         /* dev->mtu > 2K ==> connected mode */
 233         if (ipoib_cm_admin_enabled(dev)) {
 234                 if (new_mtu > ipoib_cm_max_mtu(dev))
 235                         return -EINVAL;
 236
 237                 if (new_mtu > priv->mcast_mtu)
 238                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 239                                    priv->mcast_mtu);
 240
 241                 dev->mtu = new_mtu;
 242                 return 0;
 243         }
 244
 245         if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
 246             new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 247                 return -EINVAL;
 248
 249         priv->admin_mtu = new_mtu;
 250
 251         if (priv->mcast_mtu < priv->admin_mtu)
 252                 ipoib_dbg(priv, "MTU must be smaller than the underlying "
 253                                 "link layer MTU - 4 (%u)\n", priv->mcast_mtu);
 254
 255         new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
 256
 257         if (priv->rn_ops->ndo_change_mtu) {
 258                 bool carrier_status = netif_carrier_ok(dev);
 259
 260                 netif_carrier_off(dev);
 261
 262                 /* notify lower level on the real mtu */
 263                 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
 264
 265                 if (carrier_status)
 266                         netif_carrier_on(dev);
 267         } else {
 268                 dev->mtu = new_mtu;
 269         }
 270
 271         return ret;
 272 }
 273
 274 static void ipoib_get_stats(struct net_device *dev,
 275                             struct rtnl_link_stats64 *stats)
 276 {
 277         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 278
 279         if (priv->rn_ops->ndo_get_stats64)
 280                 priv->rn_ops->ndo_get_stats64(dev, stats);
 281         else
 282                 netdev_stats_to_stats64(stats, &dev->stats);
 283 }
 284
 285 /* Called with an RCU read lock taken */
 286 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
 287                                         struct net_device *dev)
 288 {
 289         struct net *net = dev_net(dev);
 290         struct in_device *in_dev;
 291         struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
 292         struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
 293         __be32 ret_addr;
 294
 295         switch (addr->sa_family) {
 296         case AF_INET:
 297                 in_dev = in_dev_get(dev);
 298                 if (!in_dev)
 299                         return false;
 300
 301                 ret_addr = inet_confirm_addr(net, in_dev, 0,
 302                                              addr_in->sin_addr.s_addr,
 303                                              RT_SCOPE_HOST);
 304                 in_dev_put(in_dev);
 305                 if (ret_addr)
 306                         return true;
 307
 308                 break;
 309         case AF_INET6:
 310                 if (IS_ENABLED(CONFIG_IPV6) &&
 311                     ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
 312                         return true;
 313
 314                 break;
 315         }
 316         return false;
 317 }
 318
 319 /*
 320  * Find the master net_device on top of the given net_device.
 321  * @dev: base IPoIB net_device
 322  *
 323  * Returns the master net_device with a reference held, or the same net_device
 324  * if no master exists.
 325  */
 326 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
 327 {
 328         struct net_device *master;
 329
 330         rcu_read_lock();
 331         master = netdev_master_upper_dev_get_rcu(dev);
 332         if (master)
 333                 dev_hold(master);
 334         rcu_read_unlock();
 335
 336         if (master)
 337                 return master;
 338
 339         dev_hold(dev);
 340         return dev;
 341 }
 342
 343 struct ipoib_walk_data {
 344         const struct sockaddr *addr;
 345         struct net_device *result;
 346 };
 347
 348 static int ipoib_upper_walk(struct net_device *upper,
 349                             struct netdev_nested_priv *priv)
 350 {
 351         struct ipoib_walk_data *data = (struct ipoib_walk_data *)priv->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  * ipoib_get_net_dev_match_addr - Find a net_device matching
 365  * the given address, which is an upper device of the given net_device.
 366  *
 367  * @addr: IP address to look for.
 368  * @dev: base IPoIB net_device
 369  *
 370  * If found, returns the net_device with a reference held. Otherwise return
 371  * NULL.
 372  */
 373 static struct net_device *ipoib_get_net_dev_match_addr(
 374                 const struct sockaddr *addr, struct net_device *dev)
 375 {
 376         struct netdev_nested_priv priv;
 377         struct ipoib_walk_data data = {
 378                 .addr = addr,
 379         };
 380
 381         priv.data = (void *)&data;
 382         rcu_read_lock();
 383         if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
 384                 dev_hold(dev);
 385                 data.result = dev;
 386                 goto out;
 387         }
 388
 389         netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &priv);
 390 out:
 391         rcu_read_unlock();
 392         return data.result;
 393 }
 394
 395 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
 396  * pkey_index and address, if one exists.
 397  *
 398  * @found_net_dev: contains a matching net_device if the return value >= 1,
 399  * with a reference held. */
 400 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
 401                                      const union ib_gid *gid,
 402                                      u16 pkey_index,
 403                                      const struct sockaddr *addr,
 404                                      int nesting,
 405                                      struct net_device **found_net_dev)
 406 {
 407         struct ipoib_dev_priv *child_priv;
 408         struct net_device *net_dev = NULL;
 409         int matches = 0;
 410
 411         if (priv->pkey_index == pkey_index &&
 412             (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
 413                 if (!addr) {
 414                         net_dev = ipoib_get_master_net_dev(priv->dev);
 415                 } else {
 416                         /* Verify the net_device matches the IP address, as
 417                          * IPoIB child devices currently share a GID. */
 418                         net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
 419                 }
 420                 if (net_dev) {
 421                         if (!*found_net_dev)
 422                                 *found_net_dev = net_dev;
 423                         else
 424                                 dev_put(net_dev);
 425                         ++matches;
 426                 }
 427         }
 428
 429         /* Check child interfaces */
 430         down_read_nested(&priv->vlan_rwsem, nesting);
 431         list_for_each_entry(child_priv, &priv->child_intfs, list) {
 432                 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
 433                                                     pkey_index, addr,
 434                                                     nesting + 1,
 435                                                     found_net_dev);
 436                 if (matches > 1)
 437                         break;
 438         }
 439         up_read(&priv->vlan_rwsem);
 440
 441         return matches;
 442 }
 443
 444 /* Returns the number of matching net_devs found (between 0 and 2). Also
 445  * return the matching net_device in the @net_dev parameter, holding a
 446  * reference to the net_device, if the number of matches >= 1 */
 447 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u32 port,
 448                                          u16 pkey_index,
 449                                          const union ib_gid *gid,
 450                                          const struct sockaddr *addr,
 451                                          struct net_device **net_dev)
 452 {
 453         struct ipoib_dev_priv *priv;
 454         int matches = 0;
 455
 456         *net_dev = NULL;
 457
 458         list_for_each_entry(priv, dev_list, list) {
 459                 if (priv->port != port)
 460                         continue;
 461
 462                 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
 463                                                      addr, 0, net_dev);
 464                 if (matches > 1)
 465                         break;
 466         }
 467
 468         return matches;
 469 }
 470
 471 static struct net_device *ipoib_get_net_dev_by_params(
 472                 struct ib_device *dev, u32 port, u16 pkey,
 473                 const union ib_gid *gid, const struct sockaddr *addr,
 474                 void *client_data)
 475 {
 476         struct net_device *net_dev;
 477         struct list_head *dev_list = client_data;
 478         u16 pkey_index;
 479         int matches;
 480         int ret;
 481
 482         if (!rdma_protocol_ib(dev, port))
 483                 return NULL;
 484
 485         ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
 486         if (ret)
 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                 fallthrough;
 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                 netif_set_real_num_tx_queues(dev, 1);
 537                 rtnl_unlock();
 538                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 539
 540                 ipoib_flush_paths(dev);
 541                 return (!rtnl_trylock()) ? -EBUSY : 0;
 542         }
 543
 544         if (!strcmp(buf, "datagram\n")) {
 545                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 546                 netdev_update_features(dev);
 547                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 548                 netif_set_real_num_tx_queues(dev, dev->num_tx_queues);
 549                 rtnl_unlock();
 550                 ipoib_flush_paths(dev);
 551                 return (!rtnl_trylock()) ? -EBUSY : 0;
 552         }
 553
 554         return -EINVAL;
 555 }
 556
 557 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 558 {
 559         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 560         struct rb_node *n = priv->path_tree.rb_node;
 561         struct ipoib_path *path;
 562         int ret;
 563
 564         while (n) {
 565                 path = rb_entry(n, struct ipoib_path, rb_node);
 566
 567                 ret = memcmp(gid, path->pathrec.dgid.raw,
 568                              sizeof (union ib_gid));
 569
 570                 if (ret < 0)
 571                         n = n->rb_left;
 572                 else if (ret > 0)
 573                         n = n->rb_right;
 574                 else
 575                         return path;
 576         }
 577
 578         return NULL;
 579 }
 580
 581 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 582 {
 583         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 584         struct rb_node **n = &priv->path_tree.rb_node;
 585         struct rb_node *pn = NULL;
 586         struct ipoib_path *tpath;
 587         int ret;
 588
 589         while (*n) {
 590                 pn = *n;
 591                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 592
 593                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 594                              sizeof (union ib_gid));
 595                 if (ret < 0)
 596                         n = &pn->rb_left;
 597                 else if (ret > 0)
 598                         n = &pn->rb_right;
 599                 else
 600                         return -EEXIST;
 601         }
 602
 603         rb_link_node(&path->rb_node, pn, n);
 604         rb_insert_color(&path->rb_node, &priv->path_tree);
 605
 606         list_add_tail(&path->list, &priv->path_list);
 607
 608         return 0;
 609 }
 610
 611 static void path_free(struct net_device *dev, struct ipoib_path *path)
 612 {
 613         struct sk_buff *skb;
 614
 615         while ((skb = __skb_dequeue(&path->queue)))
 616                 dev_kfree_skb_irq(skb);
 617
 618         ipoib_dbg(ipoib_priv(dev), "%s\n", __func__);
 619
 620         /* remove all neigh connected to this path */
 621         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 622
 623         if (path->ah)
 624                 ipoib_put_ah(path->ah);
 625
 626         kfree(path);
 627 }
 628
 629 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 630
 631 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 632 {
 633         struct ipoib_path_iter *iter;
 634
 635         iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 636         if (!iter)
 637                 return NULL;
 638
 639         iter->dev = dev;
 640         memset(iter->path.pathrec.dgid.raw, 0, 16);
 641
 642         if (ipoib_path_iter_next(iter)) {
 643                 kfree(iter);
 644                 return NULL;
 645         }
 646
 647         return iter;
 648 }
 649
 650 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 651 {
 652         struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
 653         struct rb_node *n;
 654         struct ipoib_path *path;
 655         int ret = 1;
 656
 657         spin_lock_irq(&priv->lock);
 658
 659         n = rb_first(&priv->path_tree);
 660
 661         while (n) {
 662                 path = rb_entry(n, struct ipoib_path, rb_node);
 663
 664                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 665                            sizeof (union ib_gid)) < 0) {
 666                         iter->path = *path;
 667                         ret = 0;
 668                         break;
 669                 }
 670
 671                 n = rb_next(n);
 672         }
 673
 674         spin_unlock_irq(&priv->lock);
 675
 676         return ret;
 677 }
 678
 679 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 680                           struct ipoib_path *path)
 681 {
 682         *path = iter->path;
 683 }
 684
 685 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 686
 687 void ipoib_mark_paths_invalid(struct net_device *dev)
 688 {
 689         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 690         struct ipoib_path *path, *tp;
 691
 692         spin_lock_irq(&priv->lock);
 693
 694         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 695                 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
 696                           be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
 697                           path->pathrec.dgid.raw);
 698                 if (path->ah)
 699                         path->ah->valid = 0;
 700         }
 701
 702         spin_unlock_irq(&priv->lock);
 703 }
 704
 705 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
 706 {
 707         struct ipoib_pseudo_header *phdr;
 708
 709         phdr = skb_push(skb, sizeof(*phdr));
 710         memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 711 }
 712
 713 void ipoib_flush_paths(struct net_device *dev)
 714 {
 715         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 716         struct ipoib_path *path, *tp;
 717         LIST_HEAD(remove_list);
 718         unsigned long flags;
 719
 720         netif_tx_lock_bh(dev);
 721         spin_lock_irqsave(&priv->lock, flags);
 722
 723         list_splice_init(&priv->path_list, &remove_list);
 724
 725         list_for_each_entry(path, &remove_list, list)
 726                 rb_erase(&path->rb_node, &priv->path_tree);
 727
 728         list_for_each_entry_safe(path, tp, &remove_list, list) {
 729                 if (path->query)
 730                         ib_sa_cancel_query(path->query_id, path->query);
 731                 spin_unlock_irqrestore(&priv->lock, flags);
 732                 netif_tx_unlock_bh(dev);
 733                 wait_for_completion(&path->done);
 734                 path_free(dev, path);
 735                 netif_tx_lock_bh(dev);
 736                 spin_lock_irqsave(&priv->lock, flags);
 737         }
 738
 739         spin_unlock_irqrestore(&priv->lock, flags);
 740         netif_tx_unlock_bh(dev);
 741 }
 742
 743 static void path_rec_completion(int status,
 744                                 struct sa_path_rec *pathrec,
 745                                 unsigned int num_prs, void *path_ptr)
 746 {
 747         struct ipoib_path *path = path_ptr;
 748         struct net_device *dev = path->dev;
 749         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 750         struct ipoib_ah *ah = NULL;
 751         struct ipoib_ah *old_ah = NULL;
 752         struct ipoib_neigh *neigh, *tn;
 753         struct sk_buff_head skqueue;
 754         struct sk_buff *skb;
 755         unsigned long flags;
 756
 757         if (!status)
 758                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 759                           be32_to_cpu(sa_path_get_dlid(pathrec)),
 760                           pathrec->dgid.raw);
 761         else
 762                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 763                           status, path->pathrec.dgid.raw);
 764
 765         skb_queue_head_init(&skqueue);
 766
 767         if (!status) {
 768                 struct rdma_ah_attr av;
 769
 770                 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
 771                                                pathrec, &av, NULL)) {
 772                         ah = ipoib_create_ah(dev, priv->pd, &av);
 773                         rdma_destroy_ah_attr(&av);
 774                 }
 775         }
 776
 777         spin_lock_irqsave(&priv->lock, flags);
 778
 779         if (!IS_ERR_OR_NULL(ah)) {
 780                 /*
 781                  * pathrec.dgid is used as the database key from the LLADDR,
 782                  * it must remain unchanged even if the SA returns a different
 783                  * GID to use in the AH.
 784                  */
 785                 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
 786                            sizeof(union ib_gid))) {
 787                         ipoib_dbg(
 788                                 priv,
 789                                 "%s got PathRec for gid %pI6 while asked for %pI6\n",
 790                                 dev->name, pathrec->dgid.raw,
 791                                 path->pathrec.dgid.raw);
 792                         memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
 793                                sizeof(union ib_gid));
 794                 }
 795
 796                 path->pathrec = *pathrec;
 797
 798                 old_ah   = path->ah;
 799                 path->ah = ah;
 800
 801                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 802                           ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
 803                           pathrec->sl);
 804
 805                 while ((skb = __skb_dequeue(&path->queue)))
 806                         __skb_queue_tail(&skqueue, skb);
 807
 808                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 809                         if (neigh->ah) {
 810                                 WARN_ON(neigh->ah != old_ah);
 811                                 /*
 812                                  * Dropping the ah reference inside
 813                                  * priv->lock is safe here, because we
 814                                  * will hold one more reference from
 815                                  * the original value of path->ah (ie
 816                                  * old_ah).
 817                                  */
 818                                 ipoib_put_ah(neigh->ah);
 819                         }
 820                         kref_get(&path->ah->ref);
 821                         neigh->ah = path->ah;
 822
 823                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 824                                 if (!ipoib_cm_get(neigh))
 825                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 826                                                                                path,
 827                                                                                neigh));
 828                                 if (!ipoib_cm_get(neigh)) {
 829                                         ipoib_neigh_free(neigh);
 830                                         continue;
 831                                 }
 832                         }
 833
 834                         while ((skb = __skb_dequeue(&neigh->queue)))
 835                                 __skb_queue_tail(&skqueue, skb);
 836                 }
 837                 path->ah->valid = 1;
 838         }
 839
 840         path->query = NULL;
 841         complete(&path->done);
 842
 843         spin_unlock_irqrestore(&priv->lock, flags);
 844
 845         if (IS_ERR_OR_NULL(ah))
 846                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 847
 848         if (old_ah)
 849                 ipoib_put_ah(old_ah);
 850
 851         while ((skb = __skb_dequeue(&skqueue))) {
 852                 int ret;
 853                 skb->dev = dev;
 854                 ret = dev_queue_xmit(skb);
 855                 if (ret)
 856                         ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
 857                                    __func__, ret);
 858         }
 859 }
 860
 861 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
 862                           void *gid)
 863 {
 864         path->dev = priv->dev;
 865
 866         if (rdma_cap_opa_ah(priv->ca, priv->port))
 867                 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
 868         else
 869                 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
 870
 871         memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
 872         path->pathrec.sgid          = priv->local_gid;
 873         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 874         path->pathrec.numb_path     = 1;
 875         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 876 }
 877
 878 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 879 {
 880         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 881         struct ipoib_path *path;
 882
 883         if (!priv->broadcast)
 884                 return NULL;
 885
 886         path = kzalloc(sizeof(*path), GFP_ATOMIC);
 887         if (!path)
 888                 return NULL;
 889
 890         skb_queue_head_init(&path->queue);
 891
 892         INIT_LIST_HEAD(&path->neigh_list);
 893
 894         init_path_rec(priv, path, gid);
 895
 896         return path;
 897 }
 898
 899 static int path_rec_start(struct net_device *dev,
 900                           struct ipoib_path *path)
 901 {
 902         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 903
 904         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 905                   path->pathrec.dgid.raw);
 906
 907         init_completion(&path->done);
 908
 909         path->query_id =
 910                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 911                                    &path->pathrec,
 912                                    IB_SA_PATH_REC_DGID          |
 913                                    IB_SA_PATH_REC_SGID          |
 914                                    IB_SA_PATH_REC_NUMB_PATH     |
 915                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 916                                    IB_SA_PATH_REC_PKEY,
 917                                    1000, GFP_ATOMIC,
 918                                    path_rec_completion,
 919                                    path, &path->query);
 920         if (path->query_id < 0) {
 921                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 922                 path->query = NULL;
 923                 complete(&path->done);
 924                 return path->query_id;
 925         }
 926
 927         return 0;
 928 }
 929
 930 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
 931                                struct net_device *dev)
 932 {
 933         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 934         struct ipoib_path *path;
 935         unsigned long flags;
 936
 937         spin_lock_irqsave(&priv->lock, flags);
 938
 939         path = __path_find(dev, daddr + 4);
 940         if (!path)
 941                 goto out;
 942         if (!path->query)
 943                 path_rec_start(dev, path);
 944 out:
 945         spin_unlock_irqrestore(&priv->lock, flags);
 946 }
 947
 948 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
 949                                           struct net_device *dev)
 950 {
 951         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 952         struct rdma_netdev *rn = netdev_priv(dev);
 953         struct ipoib_path *path;
 954         struct ipoib_neigh *neigh;
 955         unsigned long flags;
 956
 957         spin_lock_irqsave(&priv->lock, flags);
 958         neigh = ipoib_neigh_alloc(daddr, dev);
 959         if (!neigh) {
 960                 spin_unlock_irqrestore(&priv->lock, flags);
 961                 ++dev->stats.tx_dropped;
 962                 dev_kfree_skb_any(skb);
 963                 return NULL;
 964         }
 965
 966         /* To avoid race condition, make sure that the
 967          * neigh will be added only once.
 968          */
 969         if (unlikely(!list_empty(&neigh->list))) {
 970                 spin_unlock_irqrestore(&priv->lock, flags);
 971                 return neigh;
 972         }
 973
 974         path = __path_find(dev, daddr + 4);
 975         if (!path) {
 976                 path = path_rec_create(dev, daddr + 4);
 977                 if (!path)
 978                         goto err_path;
 979
 980                 __path_add(dev, path);
 981         }
 982
 983         list_add_tail(&neigh->list, &path->neigh_list);
 984
 985         if (path->ah && path->ah->valid) {
 986                 kref_get(&path->ah->ref);
 987                 neigh->ah = path->ah;
 988
 989                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 990                         if (!ipoib_cm_get(neigh))
 991                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 992                         if (!ipoib_cm_get(neigh)) {
 993                                 ipoib_neigh_free(neigh);
 994                                 goto err_drop;
 995                         }
 996                         if (skb_queue_len(&neigh->queue) <
 997                             IPOIB_MAX_PATH_REC_QUEUE) {
 998                                 push_pseudo_header(skb, neigh->daddr);
 999                                 __skb_queue_tail(&neigh->queue, skb);
1000                         } else {
1001                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
1002                                            skb_queue_len(&neigh->queue));
1003                                 goto err_drop;
1004                         }
1005                 } else {
1006                         spin_unlock_irqrestore(&priv->lock, flags);
1007                         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1008                                                        IPOIB_QPN(daddr));
1009                         ipoib_neigh_put(neigh);
1010                         return NULL;
1011                 }
1012         } else {
1013                 neigh->ah  = NULL;
1014
1015                 if (!path->query && path_rec_start(dev, path))
1016                         goto err_path;
1017                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1018                         push_pseudo_header(skb, neigh->daddr);
1019                         __skb_queue_tail(&neigh->queue, skb);
1020                 } else {
1021                         goto err_drop;
1022                 }
1023         }
1024
1025         spin_unlock_irqrestore(&priv->lock, flags);
1026         ipoib_neigh_put(neigh);
1027         return NULL;
1028
1029 err_path:
1030         ipoib_neigh_free(neigh);
1031 err_drop:
1032         ++dev->stats.tx_dropped;
1033         dev_kfree_skb_any(skb);
1034
1035         spin_unlock_irqrestore(&priv->lock, flags);
1036         ipoib_neigh_put(neigh);
1037
1038         return NULL;
1039 }
1040
1041 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1042                              struct ipoib_pseudo_header *phdr)
1043 {
1044         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1045         struct rdma_netdev *rn = netdev_priv(dev);
1046         struct ipoib_path *path;
1047         unsigned long flags;
1048
1049         spin_lock_irqsave(&priv->lock, flags);
1050
1051         /* no broadcast means that all paths are (going to be) not valid */
1052         if (!priv->broadcast)
1053                 goto drop_and_unlock;
1054
1055         path = __path_find(dev, phdr->hwaddr + 4);
1056         if (!path || !path->ah || !path->ah->valid) {
1057                 if (!path) {
1058                         path = path_rec_create(dev, phdr->hwaddr + 4);
1059                         if (!path)
1060                                 goto drop_and_unlock;
1061                         __path_add(dev, path);
1062                 } else {
1063                         /*
1064                          * make sure there are no changes in the existing
1065                          * path record
1066                          */
1067                         init_path_rec(priv, path, phdr->hwaddr + 4);
1068                 }
1069                 if (!path->query && path_rec_start(dev, path)) {
1070                         goto drop_and_unlock;
1071                 }
1072
1073                 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1074                         push_pseudo_header(skb, phdr->hwaddr);
1075                         __skb_queue_tail(&path->queue, skb);
1076                         goto unlock;
1077                 } else {
1078                         goto drop_and_unlock;
1079                 }
1080         }
1081
1082         spin_unlock_irqrestore(&priv->lock, flags);
1083         ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1084                   be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1085         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1086                                        IPOIB_QPN(phdr->hwaddr));
1087         return;
1088
1089 drop_and_unlock:
1090         ++dev->stats.tx_dropped;
1091         dev_kfree_skb_any(skb);
1092 unlock:
1093         spin_unlock_irqrestore(&priv->lock, flags);
1094 }
1095
1096 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1097 {
1098         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1099         struct rdma_netdev *rn = netdev_priv(dev);
1100         struct ipoib_neigh *neigh;
1101         struct ipoib_pseudo_header *phdr;
1102         struct ipoib_header *header;
1103         unsigned long flags;
1104
1105         phdr = (struct ipoib_pseudo_header *) skb->data;
1106         skb_pull(skb, sizeof(*phdr));
1107         header = (struct ipoib_header *) skb->data;
1108
1109         if (unlikely(phdr->hwaddr[4] == 0xff)) {
1110                 /* multicast, arrange "if" according to probability */
1111                 if ((header->proto != htons(ETH_P_IP)) &&
1112                     (header->proto != htons(ETH_P_IPV6)) &&
1113                     (header->proto != htons(ETH_P_ARP)) &&
1114                     (header->proto != htons(ETH_P_RARP)) &&
1115                     (header->proto != htons(ETH_P_TIPC))) {
1116                         /* ethertype not supported by IPoIB */
1117                         ++dev->stats.tx_dropped;
1118                         dev_kfree_skb_any(skb);
1119                         return NETDEV_TX_OK;
1120                 }
1121                 /* Add in the P_Key for multicast*/
1122                 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1123                 phdr->hwaddr[9] = priv->pkey & 0xff;
1124
1125                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1126                 if (likely(neigh))
1127                         goto send_using_neigh;
1128                 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1129                 return NETDEV_TX_OK;
1130         }
1131
1132         /* unicast, arrange "switch" according to probability */
1133         switch (header->proto) {
1134         case htons(ETH_P_IP):
1135         case htons(ETH_P_IPV6):
1136         case htons(ETH_P_TIPC):
1137                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1138                 if (unlikely(!neigh)) {
1139                         neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1140                         if (likely(!neigh))
1141                                 return NETDEV_TX_OK;
1142                 }
1143                 break;
1144         case htons(ETH_P_ARP):
1145         case htons(ETH_P_RARP):
1146                 /* for unicast ARP and RARP should always perform path find */
1147                 unicast_arp_send(skb, dev, phdr);
1148                 return NETDEV_TX_OK;
1149         default:
1150                 /* ethertype not supported by IPoIB */
1151                 ++dev->stats.tx_dropped;
1152                 dev_kfree_skb_any(skb);
1153                 return NETDEV_TX_OK;
1154         }
1155
1156 send_using_neigh:
1157         /* note we now hold a ref to neigh */
1158         if (ipoib_cm_get(neigh)) {
1159                 if (ipoib_cm_up(neigh)) {
1160                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1161                         goto unref;
1162                 }
1163         } else if (neigh->ah && neigh->ah->valid) {
1164                 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1165                                                 IPOIB_QPN(phdr->hwaddr));
1166                 goto unref;
1167         } else if (neigh->ah) {
1168                 neigh_refresh_path(neigh, phdr->hwaddr, dev);
1169         }
1170
1171         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1172                 push_pseudo_header(skb, phdr->hwaddr);
1173                 spin_lock_irqsave(&priv->lock, flags);
1174                 __skb_queue_tail(&neigh->queue, skb);
1175                 spin_unlock_irqrestore(&priv->lock, flags);
1176         } else {
1177                 ++dev->stats.tx_dropped;
1178                 dev_kfree_skb_any(skb);
1179         }
1180
1181 unref:
1182         ipoib_neigh_put(neigh);
1183
1184         return NETDEV_TX_OK;
1185 }
1186
1187 static void ipoib_timeout(struct net_device *dev, unsigned int txqueue)
1188 {
1189         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1190         struct rdma_netdev *rn = netdev_priv(dev);
1191
1192         if (rn->tx_timeout) {
1193                 rn->tx_timeout(dev, txqueue);
1194                 return;
1195         }
1196         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1197                    jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1198         ipoib_warn(priv,
1199                    "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n",
1200                    netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
1201                    priv->global_tx_head, priv->global_tx_tail);
1202
1203         /* XXX reset QP, etc. */
1204 }
1205
1206 static int ipoib_hard_header(struct sk_buff *skb,
1207                              struct net_device *dev,
1208                              unsigned short type,
1209                              const void *daddr,
1210                              const void *saddr,
1211                              unsigned int len)
1212 {
1213         struct ipoib_header *header;
1214
1215         header = skb_push(skb, sizeof(*header));
1216
1217         header->proto = htons(type);
1218         header->reserved = 0;
1219
1220         /*
1221          * we don't rely on dst_entry structure,  always stuff the
1222          * destination address into skb hard header so we can figure out where
1223          * to send the packet later.
1224          */
1225         push_pseudo_header(skb, daddr);
1226
1227         return IPOIB_HARD_LEN;
1228 }
1229
1230 static void ipoib_set_mcast_list(struct net_device *dev)
1231 {
1232         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1233
1234         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1235                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1236                 return;
1237         }
1238
1239         queue_work(priv->wq, &priv->restart_task);
1240 }
1241
1242 static int ipoib_get_iflink(const struct net_device *dev)
1243 {
1244         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1245
1246         /* parent interface */
1247         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1248                 return dev->ifindex;
1249
1250         /* child/vlan interface */
1251         return priv->parent->ifindex;
1252 }
1253
1254 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1255 {
1256         /*
1257          * Use only the address parts that contributes to spreading
1258          * The subnet prefix is not used as one can not connect to
1259          * same remote port (GUID) using the same remote QPN via two
1260          * different subnets.
1261          */
1262          /* qpn octets[1:4) & port GUID octets[12:20) */
1263         u32 *d32 = (u32 *) daddr;
1264         u32 hv;
1265
1266         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1267         return hv & htbl->mask;
1268 }
1269
1270 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1271 {
1272         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1273         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1274         struct ipoib_neigh_hash *htbl;
1275         struct ipoib_neigh *neigh = NULL;
1276         u32 hash_val;
1277
1278         rcu_read_lock_bh();
1279
1280         htbl = rcu_dereference_bh(ntbl->htbl);
1281
1282         if (!htbl)
1283                 goto out_unlock;
1284
1285         hash_val = ipoib_addr_hash(htbl, daddr);
1286         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1287              neigh != NULL;
1288              neigh = rcu_dereference_bh(neigh->hnext)) {
1289                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1290                         /* found, take one ref on behalf of the caller */
1291                         if (!refcount_inc_not_zero(&neigh->refcnt)) {
1292                                 /* deleted */
1293                                 neigh = NULL;
1294                                 goto out_unlock;
1295                         }
1296
1297                         if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1298                                 neigh->alive = jiffies;
1299                         goto out_unlock;
1300                 }
1301         }
1302
1303 out_unlock:
1304         rcu_read_unlock_bh();
1305         return neigh;
1306 }
1307
1308 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1309 {
1310         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1311         struct ipoib_neigh_hash *htbl;
1312         unsigned long neigh_obsolete;
1313         unsigned long dt;
1314         unsigned long flags;
1315         int i;
1316         LIST_HEAD(remove_list);
1317
1318         spin_lock_irqsave(&priv->lock, flags);
1319
1320         htbl = rcu_dereference_protected(ntbl->htbl,
1321                                          lockdep_is_held(&priv->lock));
1322
1323         if (!htbl)
1324                 goto out_unlock;
1325
1326         /* neigh is obsolete if it was idle for two GC periods */
1327         dt = 2 * arp_tbl.gc_interval;
1328         neigh_obsolete = jiffies - dt;
1329
1330         for (i = 0; i < htbl->size; i++) {
1331                 struct ipoib_neigh *neigh;
1332                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1333
1334                 while ((neigh = rcu_dereference_protected(*np,
1335                                                           lockdep_is_held(&priv->lock))) != NULL) {
1336                         /* was the neigh idle for two GC periods */
1337                         if (time_after(neigh_obsolete, neigh->alive)) {
1338
1339                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1340
1341                                 rcu_assign_pointer(*np,
1342                                                    rcu_dereference_protected(neigh->hnext,
1343                                                                              lockdep_is_held(&priv->lock)));
1344                                 /* remove from path/mc list */
1345                                 list_del_init(&neigh->list);
1346                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1347                         } else {
1348                                 np = &neigh->hnext;
1349                         }
1350
1351                 }
1352         }
1353
1354 out_unlock:
1355         spin_unlock_irqrestore(&priv->lock, flags);
1356         ipoib_mcast_remove_list(&remove_list);
1357 }
1358
1359 static void ipoib_reap_neigh(struct work_struct *work)
1360 {
1361         struct ipoib_dev_priv *priv =
1362                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1363
1364         __ipoib_reap_neigh(priv);
1365
1366         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1367                            arp_tbl.gc_interval);
1368 }
1369
1370
1371 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1372                                       struct net_device *dev)
1373 {
1374         struct ipoib_neigh *neigh;
1375
1376         neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
1377         if (!neigh)
1378                 return NULL;
1379
1380         neigh->dev = dev;
1381         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1382         skb_queue_head_init(&neigh->queue);
1383         INIT_LIST_HEAD(&neigh->list);
1384         ipoib_cm_set(neigh, NULL);
1385         /* one ref on behalf of the caller */
1386         refcount_set(&neigh->refcnt, 1);
1387
1388         return neigh;
1389 }
1390
1391 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1392                                       struct net_device *dev)
1393 {
1394         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1395         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1396         struct ipoib_neigh_hash *htbl;
1397         struct ipoib_neigh *neigh;
1398         u32 hash_val;
1399
1400         htbl = rcu_dereference_protected(ntbl->htbl,
1401                                          lockdep_is_held(&priv->lock));
1402         if (!htbl) {
1403                 neigh = NULL;
1404                 goto out_unlock;
1405         }
1406
1407         /* need to add a new neigh, but maybe some other thread succeeded?
1408          * recalc hash, maybe hash resize took place so we do a search
1409          */
1410         hash_val = ipoib_addr_hash(htbl, daddr);
1411         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1412                                                lockdep_is_held(&priv->lock));
1413              neigh != NULL;
1414              neigh = rcu_dereference_protected(neigh->hnext,
1415                                                lockdep_is_held(&priv->lock))) {
1416                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1417                         /* found, take one ref on behalf of the caller */
1418                         if (!refcount_inc_not_zero(&neigh->refcnt)) {
1419                                 /* deleted */
1420                                 neigh = NULL;
1421                                 break;
1422                         }
1423                         neigh->alive = jiffies;
1424                         goto out_unlock;
1425                 }
1426         }
1427
1428         neigh = ipoib_neigh_ctor(daddr, dev);
1429         if (!neigh)
1430                 goto out_unlock;
1431
1432         /* one ref on behalf of the hash table */
1433         refcount_inc(&neigh->refcnt);
1434         neigh->alive = jiffies;
1435         /* put in hash */
1436         rcu_assign_pointer(neigh->hnext,
1437                            rcu_dereference_protected(htbl->buckets[hash_val],
1438                                                      lockdep_is_held(&priv->lock)));
1439         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1440         atomic_inc(&ntbl->entries);
1441
1442 out_unlock:
1443
1444         return neigh;
1445 }
1446
1447 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1448 {
1449         /* neigh reference count was dropprd to zero */
1450         struct net_device *dev = neigh->dev;
1451         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1452         struct sk_buff *skb;
1453         if (neigh->ah)
1454                 ipoib_put_ah(neigh->ah);
1455         while ((skb = __skb_dequeue(&neigh->queue))) {
1456                 ++dev->stats.tx_dropped;
1457                 dev_kfree_skb_any(skb);
1458         }
1459         if (ipoib_cm_get(neigh))
1460                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1461         ipoib_dbg(ipoib_priv(dev),
1462                   "neigh free for %06x %pI6\n",
1463                   IPOIB_QPN(neigh->daddr),
1464                   neigh->daddr + 4);
1465         kfree(neigh);
1466         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1467                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1468                         complete(&priv->ntbl.flushed);
1469         }
1470 }
1471
1472 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1473 {
1474         /* Called as a result of removal from hash table */
1475         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1476         /* note TX context may hold another ref */
1477         ipoib_neigh_put(neigh);
1478 }
1479
1480 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1481 {
1482         struct net_device *dev = neigh->dev;
1483         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1484         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1485         struct ipoib_neigh_hash *htbl;
1486         struct ipoib_neigh __rcu **np;
1487         struct ipoib_neigh *n;
1488         u32 hash_val;
1489
1490         htbl = rcu_dereference_protected(ntbl->htbl,
1491                                         lockdep_is_held(&priv->lock));
1492         if (!htbl)
1493                 return;
1494
1495         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1496         np = &htbl->buckets[hash_val];
1497         for (n = rcu_dereference_protected(*np,
1498                                             lockdep_is_held(&priv->lock));
1499              n != NULL;
1500              n = rcu_dereference_protected(*np,
1501                                         lockdep_is_held(&priv->lock))) {
1502                 if (n == neigh) {
1503                         /* found */
1504                         rcu_assign_pointer(*np,
1505                                            rcu_dereference_protected(neigh->hnext,
1506                                                                      lockdep_is_held(&priv->lock)));
1507                         /* remove from parent list */
1508                         list_del_init(&neigh->list);
1509                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1510                         return;
1511                 } else {
1512                         np = &n->hnext;
1513                 }
1514         }
1515 }
1516
1517 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1518 {
1519         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1520         struct ipoib_neigh_hash *htbl;
1521         struct ipoib_neigh __rcu **buckets;
1522         u32 size;
1523
1524         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1525         ntbl->htbl = NULL;
1526         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1527         if (!htbl)
1528                 return -ENOMEM;
1529         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1530         buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
1531         if (!buckets) {
1532                 kfree(htbl);
1533                 return -ENOMEM;
1534         }
1535         htbl->size = size;
1536         htbl->mask = (size - 1);
1537         htbl->buckets = buckets;
1538         RCU_INIT_POINTER(ntbl->htbl, htbl);
1539         htbl->ntbl = ntbl;
1540         atomic_set(&ntbl->entries, 0);
1541
1542         /* start garbage collection */
1543         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1544                            arp_tbl.gc_interval);
1545
1546         return 0;
1547 }
1548
1549 static void neigh_hash_free_rcu(struct rcu_head *head)
1550 {
1551         struct ipoib_neigh_hash *htbl = container_of(head,
1552                                                     struct ipoib_neigh_hash,
1553                                                     rcu);
1554         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1555         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1556
1557         kvfree(buckets);
1558         kfree(htbl);
1559         complete(&ntbl->deleted);
1560 }
1561
1562 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1563 {
1564         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1565         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1566         struct ipoib_neigh_hash *htbl;
1567         unsigned long flags;
1568         int i;
1569
1570         /* remove all neigh connected to a given path or mcast */
1571         spin_lock_irqsave(&priv->lock, flags);
1572
1573         htbl = rcu_dereference_protected(ntbl->htbl,
1574                                          lockdep_is_held(&priv->lock));
1575
1576         if (!htbl)
1577                 goto out_unlock;
1578
1579         for (i = 0; i < htbl->size; i++) {
1580                 struct ipoib_neigh *neigh;
1581                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1582
1583                 while ((neigh = rcu_dereference_protected(*np,
1584                                                           lockdep_is_held(&priv->lock))) != NULL) {
1585                         /* delete neighs belong to this parent */
1586                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1587                                 rcu_assign_pointer(*np,
1588                                                    rcu_dereference_protected(neigh->hnext,
1589                                                                              lockdep_is_held(&priv->lock)));
1590                                 /* remove from parent list */
1591                                 list_del_init(&neigh->list);
1592                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1593                         } else {
1594                                 np = &neigh->hnext;
1595                         }
1596
1597                 }
1598         }
1599 out_unlock:
1600         spin_unlock_irqrestore(&priv->lock, flags);
1601 }
1602
1603 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1604 {
1605         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1606         struct ipoib_neigh_hash *htbl;
1607         unsigned long flags;
1608         int i, wait_flushed = 0;
1609
1610         init_completion(&priv->ntbl.flushed);
1611         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1612
1613         spin_lock_irqsave(&priv->lock, flags);
1614
1615         htbl = rcu_dereference_protected(ntbl->htbl,
1616                                         lockdep_is_held(&priv->lock));
1617         if (!htbl)
1618                 goto out_unlock;
1619
1620         wait_flushed = atomic_read(&priv->ntbl.entries);
1621         if (!wait_flushed)
1622                 goto free_htbl;
1623
1624         for (i = 0; i < htbl->size; i++) {
1625                 struct ipoib_neigh *neigh;
1626                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1627
1628                 while ((neigh = rcu_dereference_protected(*np,
1629                                        lockdep_is_held(&priv->lock))) != NULL) {
1630                         rcu_assign_pointer(*np,
1631                                            rcu_dereference_protected(neigh->hnext,
1632                                                                      lockdep_is_held(&priv->lock)));
1633                         /* remove from path/mc list */
1634                         list_del_init(&neigh->list);
1635                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1636                 }
1637         }
1638
1639 free_htbl:
1640         rcu_assign_pointer(ntbl->htbl, NULL);
1641         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1642
1643 out_unlock:
1644         spin_unlock_irqrestore(&priv->lock, flags);
1645         if (wait_flushed)
1646                 wait_for_completion(&priv->ntbl.flushed);
1647 }
1648
1649 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1650 {
1651         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1652
1653         ipoib_dbg(priv, "%s\n", __func__);
1654         init_completion(&priv->ntbl.deleted);
1655
1656         cancel_delayed_work_sync(&priv->neigh_reap_task);
1657
1658         ipoib_flush_neighs(priv);
1659
1660         wait_for_completion(&priv->ntbl.deleted);
1661 }
1662
1663 static void ipoib_napi_add(struct net_device *dev)
1664 {
1665         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1666
1667         netif_napi_add_weight(dev, &priv->recv_napi, ipoib_rx_poll,
1668                               IPOIB_NUM_WC);
1669         netif_napi_add_weight(dev, &priv->send_napi, ipoib_tx_poll,
1670                               MAX_SEND_CQE);
1671 }
1672
1673 static void ipoib_napi_del(struct net_device *dev)
1674 {
1675         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1676
1677         netif_napi_del(&priv->recv_napi);
1678         netif_napi_del(&priv->send_napi);
1679 }
1680
1681 static void ipoib_dev_uninit_default(struct net_device *dev)
1682 {
1683         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1684
1685         ipoib_transport_dev_cleanup(dev);
1686
1687         ipoib_napi_del(dev);
1688
1689         ipoib_cm_dev_cleanup(dev);
1690
1691         kfree(priv->rx_ring);
1692         vfree(priv->tx_ring);
1693
1694         priv->rx_ring = NULL;
1695         priv->tx_ring = NULL;
1696 }
1697
1698 static int ipoib_dev_init_default(struct net_device *dev)
1699 {
1700         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1701         u8 addr_mod[3];
1702
1703         ipoib_napi_add(dev);
1704
1705         /* Allocate RX/TX "rings" to hold queued skbs */
1706         priv->rx_ring = kcalloc(ipoib_recvq_size,
1707                                        sizeof(*priv->rx_ring),
1708                                        GFP_KERNEL);
1709         if (!priv->rx_ring)
1710                 goto out;
1711
1712         priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1713                                            sizeof(*priv->tx_ring)));
1714         if (!priv->tx_ring) {
1715                 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1716                         priv->ca->name, ipoib_sendq_size);
1717                 goto out_rx_ring_cleanup;
1718         }
1719
1720         /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */
1721
1722         if (ipoib_transport_dev_init(dev, priv->ca)) {
1723                 pr_warn("%s: ipoib_transport_dev_init failed\n",
1724                         priv->ca->name);
1725                 goto out_tx_ring_cleanup;
1726         }
1727
1728         /* after qp created set dev address */
1729         addr_mod[0] = (priv->qp->qp_num >> 16) & 0xff;
1730         addr_mod[1] = (priv->qp->qp_num >>  8) & 0xff;
1731         addr_mod[2] = (priv->qp->qp_num) & 0xff;
1732         dev_addr_mod(priv->dev, 1, addr_mod, sizeof(addr_mod));
1733
1734         return 0;
1735
1736 out_tx_ring_cleanup:
1737         vfree(priv->tx_ring);
1738
1739 out_rx_ring_cleanup:
1740         kfree(priv->rx_ring);
1741
1742 out:
1743         ipoib_napi_del(dev);
1744         return -ENOMEM;
1745 }
1746
1747 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1748                        int cmd)
1749 {
1750         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1751
1752         if (!priv->rn_ops->ndo_eth_ioctl)
1753                 return -EOPNOTSUPP;
1754
1755         return priv->rn_ops->ndo_eth_ioctl(dev, ifr, cmd);
1756 }
1757
1758 static int ipoib_dev_init(struct net_device *dev)
1759 {
1760         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1761         int ret = -ENOMEM;
1762
1763         priv->qp = NULL;
1764
1765         /*
1766          * the various IPoIB tasks assume they will never race against
1767          * themselves, so always use a single thread workqueue
1768          */
1769         priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1770         if (!priv->wq) {
1771                 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1772                 goto out;
1773         }
1774
1775         /* create pd, which used both for control and datapath*/
1776         priv->pd = ib_alloc_pd(priv->ca, 0);
1777         if (IS_ERR(priv->pd)) {
1778                 pr_warn("%s: failed to allocate PD\n", priv->ca->name);
1779                 goto clean_wq;
1780         }
1781
1782         ret = priv->rn_ops->ndo_init(dev);
1783         if (ret) {
1784                 pr_warn("%s failed to init HW resource\n", dev->name);
1785                 goto out_free_pd;
1786         }
1787
1788         ret = ipoib_neigh_hash_init(priv);
1789         if (ret) {
1790                 pr_warn("%s failed to init neigh hash\n", dev->name);
1791                 goto out_dev_uninit;
1792         }
1793
1794         if (dev->flags & IFF_UP) {
1795                 if (ipoib_ib_dev_open(dev)) {
1796                         pr_warn("%s failed to open device\n", dev->name);
1797                         ret = -ENODEV;
1798                         goto out_hash_uninit;
1799                 }
1800         }
1801
1802         return 0;
1803
1804 out_hash_uninit:
1805         ipoib_neigh_hash_uninit(dev);
1806
1807 out_dev_uninit:
1808         ipoib_ib_dev_cleanup(dev);
1809
1810 out_free_pd:
1811         if (priv->pd) {
1812                 ib_dealloc_pd(priv->pd);
1813                 priv->pd = NULL;
1814         }
1815
1816 clean_wq:
1817         if (priv->wq) {
1818                 destroy_workqueue(priv->wq);
1819                 priv->wq = NULL;
1820         }
1821
1822 out:
1823         return ret;
1824 }
1825
1826 /*
1827  * This must be called before doing an unregister_netdev on a parent device to
1828  * shutdown the IB event handler.
1829  */
1830 static void ipoib_parent_unregister_pre(struct net_device *ndev)
1831 {
1832         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1833
1834         /*
1835          * ipoib_set_mac checks netif_running before pushing work, clearing
1836          * running ensures the it will not add more work.
1837          */
1838         rtnl_lock();
1839         dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL);
1840         rtnl_unlock();
1841
1842         /* ipoib_event() cannot be running once this returns */
1843         ib_unregister_event_handler(&priv->event_handler);
1844
1845         /*
1846          * Work on the queue grabs the rtnl lock, so this cannot be done while
1847          * also holding it.
1848          */
1849         flush_workqueue(ipoib_workqueue);
1850 }
1851
1852 static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
1853 {
1854         priv->hca_caps = priv->ca->attrs.device_cap_flags;
1855         priv->kernel_caps = priv->ca->attrs.kernel_cap_flags;
1856
1857         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1858                 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1859
1860                 if (priv->kernel_caps & IBK_UD_TSO)
1861                         priv->dev->hw_features |= NETIF_F_TSO;
1862
1863                 priv->dev->features |= priv->dev->hw_features;
1864         }
1865 }
1866
1867 static int ipoib_parent_init(struct net_device *ndev)
1868 {
1869         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1870         struct ib_port_attr attr;
1871         int result;
1872
1873         result = ib_query_port(priv->ca, priv->port, &attr);
1874         if (result) {
1875                 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
1876                         priv->port);
1877                 return result;
1878         }
1879         priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr);
1880
1881         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1882         if (result) {
1883                 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
1884                         priv->ca->name, priv->port, result);
1885                 return result;
1886         }
1887
1888         result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
1889         if (result) {
1890                 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
1891                         priv->ca->name, priv->port, result);
1892                 return result;
1893         }
1894         dev_addr_mod(priv->dev, 4, priv->local_gid.raw, sizeof(union ib_gid));
1895
1896         SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
1897         priv->dev->dev_port = priv->port - 1;
1898         /* Let's set this one too for backwards compatibility. */
1899         priv->dev->dev_id = priv->port - 1;
1900
1901         return 0;
1902 }
1903
1904 static void ipoib_child_init(struct net_device *ndev)
1905 {
1906         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1907         struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1908
1909         priv->max_ib_mtu = ppriv->max_ib_mtu;
1910         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
1911         if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN))
1912                 memcpy(&priv->local_gid, priv->dev->dev_addr + 4,
1913                        sizeof(priv->local_gid));
1914         else {
1915                 __dev_addr_set(priv->dev, ppriv->dev->dev_addr,
1916                                INFINIBAND_ALEN);
1917                 memcpy(&priv->local_gid, &ppriv->local_gid,
1918                        sizeof(priv->local_gid));
1919         }
1920 }
1921
1922 static int ipoib_ndo_init(struct net_device *ndev)
1923 {
1924         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1925         int rc;
1926         struct rdma_netdev *rn = netdev_priv(ndev);
1927
1928         if (priv->parent) {
1929                 ipoib_child_init(ndev);
1930         } else {
1931                 rc = ipoib_parent_init(ndev);
1932                 if (rc)
1933                         return rc;
1934         }
1935
1936         /* MTU will be reset when mcast join happens */
1937         ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1938         priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
1939         rn->mtu = priv->mcast_mtu;
1940         ndev->max_mtu = IPOIB_CM_MTU;
1941
1942         ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
1943
1944         /*
1945          * Set the full membership bit, so that we join the right
1946          * broadcast group, etc.
1947          */
1948         priv->pkey |= 0x8000;
1949
1950         ndev->broadcast[8] = priv->pkey >> 8;
1951         ndev->broadcast[9] = priv->pkey & 0xff;
1952         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1953
1954         ipoib_set_dev_features(priv);
1955
1956         rc = ipoib_dev_init(ndev);
1957         if (rc) {
1958                 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
1959                         priv->ca->name, priv->dev->name, priv->port, rc);
1960                 return rc;
1961         }
1962
1963         if (priv->parent) {
1964                 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1965
1966                 dev_hold(priv->parent);
1967
1968                 down_write(&ppriv->vlan_rwsem);
1969                 list_add_tail(&priv->list, &ppriv->child_intfs);
1970                 up_write(&ppriv->vlan_rwsem);
1971         }
1972
1973         return 0;
1974 }
1975
1976 static void ipoib_ndo_uninit(struct net_device *dev)
1977 {
1978         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1979
1980         ASSERT_RTNL();
1981
1982         /*
1983          * ipoib_remove_one guarantees the children are removed before the
1984          * parent, and that is the only place where a parent can be removed.
1985          */
1986         WARN_ON(!list_empty(&priv->child_intfs));
1987
1988         if (priv->parent) {
1989                 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1990
1991                 down_write(&ppriv->vlan_rwsem);
1992                 list_del(&priv->list);
1993                 up_write(&ppriv->vlan_rwsem);
1994         }
1995
1996         ipoib_neigh_hash_uninit(dev);
1997
1998         ipoib_ib_dev_cleanup(dev);
1999
2000         /* no more works over the priv->wq */
2001         if (priv->wq) {
2002                 /* See ipoib_mcast_carrier_on_task() */
2003                 WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags));
2004                 destroy_workqueue(priv->wq);
2005                 priv->wq = NULL;
2006         }
2007
2008         dev_put(priv->parent);
2009 }
2010
2011 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
2012 {
2013         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2014
2015         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
2016 }
2017
2018 static int ipoib_get_vf_config(struct net_device *dev, int vf,
2019                                struct ifla_vf_info *ivf)
2020 {
2021         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2022         int err;
2023
2024         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
2025         if (err)
2026                 return err;
2027
2028         ivf->vf = vf;
2029         memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
2030
2031         return 0;
2032 }
2033
2034 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
2035 {
2036         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2037
2038         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
2039                 return -EINVAL;
2040
2041         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
2042 }
2043
2044 static int ipoib_get_vf_guid(struct net_device *dev, int vf,
2045                              struct ifla_vf_guid *node_guid,
2046                              struct ifla_vf_guid *port_guid)
2047 {
2048         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2049
2050         return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid);
2051 }
2052
2053 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
2054                               struct ifla_vf_stats *vf_stats)
2055 {
2056         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2057
2058         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
2059 }
2060
2061 static const struct header_ops ipoib_header_ops = {
2062         .create = ipoib_hard_header,
2063 };
2064
2065 static const struct net_device_ops ipoib_netdev_ops_pf = {
2066         .ndo_init                = ipoib_ndo_init,
2067         .ndo_uninit              = ipoib_ndo_uninit,
2068         .ndo_open                = ipoib_open,
2069         .ndo_stop                = ipoib_stop,
2070         .ndo_change_mtu          = ipoib_change_mtu,
2071         .ndo_fix_features        = ipoib_fix_features,
2072         .ndo_start_xmit          = ipoib_start_xmit,
2073         .ndo_tx_timeout          = ipoib_timeout,
2074         .ndo_set_rx_mode         = ipoib_set_mcast_list,
2075         .ndo_get_iflink          = ipoib_get_iflink,
2076         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
2077         .ndo_get_vf_config       = ipoib_get_vf_config,
2078         .ndo_get_vf_stats        = ipoib_get_vf_stats,
2079         .ndo_get_vf_guid         = ipoib_get_vf_guid,
2080         .ndo_set_vf_guid         = ipoib_set_vf_guid,
2081         .ndo_set_mac_address     = ipoib_set_mac,
2082         .ndo_get_stats64         = ipoib_get_stats,
2083         .ndo_eth_ioctl           = ipoib_ioctl,
2084 };
2085
2086 static const struct net_device_ops ipoib_netdev_ops_vf = {
2087         .ndo_init                = ipoib_ndo_init,
2088         .ndo_uninit              = ipoib_ndo_uninit,
2089         .ndo_open                = ipoib_open,
2090         .ndo_stop                = ipoib_stop,
2091         .ndo_change_mtu          = ipoib_change_mtu,
2092         .ndo_fix_features        = ipoib_fix_features,
2093         .ndo_start_xmit          = ipoib_start_xmit,
2094         .ndo_tx_timeout          = ipoib_timeout,
2095         .ndo_set_rx_mode         = ipoib_set_mcast_list,
2096         .ndo_get_iflink          = ipoib_get_iflink,
2097         .ndo_get_stats64         = ipoib_get_stats,
2098         .ndo_eth_ioctl           = ipoib_ioctl,
2099 };
2100
2101 static const struct net_device_ops ipoib_netdev_default_pf = {
2102         .ndo_init                = ipoib_dev_init_default,
2103         .ndo_uninit              = ipoib_dev_uninit_default,
2104         .ndo_open                = ipoib_ib_dev_open_default,
2105         .ndo_stop                = ipoib_ib_dev_stop_default,
2106 };
2107
2108 void ipoib_setup_common(struct net_device *dev)
2109 {
2110         dev->header_ops          = &ipoib_header_ops;
2111         dev->netdev_ops          = &ipoib_netdev_default_pf;
2112
2113         ipoib_set_ethtool_ops(dev);
2114
2115         dev->watchdog_timeo      = HZ;
2116
2117         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
2118
2119         dev->hard_header_len     = IPOIB_HARD_LEN;
2120         dev->addr_len            = INFINIBAND_ALEN;
2121         dev->type                = ARPHRD_INFINIBAND;
2122         dev->tx_queue_len        = ipoib_sendq_size * 2;
2123         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
2124                                     NETIF_F_HIGHDMA);
2125         netif_keep_dst(dev);
2126
2127         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
2128
2129         /*
2130          * unregister_netdev always frees the netdev, we use this mode
2131          * consistently to unify all the various unregister paths, including
2132          * those connected to rtnl_link_ops which require it.
2133          */
2134         dev->needs_free_netdev = true;
2135 }
2136
2137 static void ipoib_build_priv(struct net_device *dev)
2138 {
2139         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2140
2141         priv->dev = dev;
2142         spin_lock_init(&priv->lock);
2143         init_rwsem(&priv->vlan_rwsem);
2144         mutex_init(&priv->mcast_mutex);
2145
2146         INIT_LIST_HEAD(&priv->path_list);
2147         INIT_LIST_HEAD(&priv->child_intfs);
2148         INIT_LIST_HEAD(&priv->dead_ahs);
2149         INIT_LIST_HEAD(&priv->multicast_list);
2150
2151         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
2152         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
2153         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
2154         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
2155         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
2156         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
2157         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
2158         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
2159 }
2160
2161 static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u32 port,
2162                                              const char *name)
2163 {
2164         struct net_device *dev;
2165
2166         dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2167                                 NET_NAME_UNKNOWN, ipoib_setup_common);
2168         if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP)
2169                 return dev;
2170
2171         dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN,
2172                            ipoib_setup_common);
2173         if (!dev)
2174                 return ERR_PTR(-ENOMEM);
2175         return dev;
2176 }
2177
2178 int ipoib_intf_init(struct ib_device *hca, u32 port, const char *name,
2179                     struct net_device *dev)
2180 {
2181         struct rdma_netdev *rn = netdev_priv(dev);
2182         struct ipoib_dev_priv *priv;
2183         int rc;
2184
2185         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2186         if (!priv)
2187                 return -ENOMEM;
2188
2189         priv->ca = hca;
2190         priv->port = port;
2191
2192         rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2193                               NET_NAME_UNKNOWN, ipoib_setup_common, dev);
2194         if (rc) {
2195                 if (rc != -EOPNOTSUPP)
2196                         goto out;
2197
2198                 rn->send = ipoib_send;
2199                 rn->attach_mcast = ipoib_mcast_attach;
2200                 rn->detach_mcast = ipoib_mcast_detach;
2201                 rn->hca = hca;
2202
2203                 rc = netif_set_real_num_tx_queues(dev, 1);
2204                 if (rc)
2205                         goto out;
2206
2207                 rc = netif_set_real_num_rx_queues(dev, 1);
2208                 if (rc)
2209                         goto out;
2210         }
2211
2212         priv->rn_ops = dev->netdev_ops;
2213
2214         if (hca->attrs.kernel_cap_flags & IBK_VIRTUAL_FUNCTION)
2215                 dev->netdev_ops = &ipoib_netdev_ops_vf;
2216         else
2217                 dev->netdev_ops = &ipoib_netdev_ops_pf;
2218
2219         rn->clnt_priv = priv;
2220         /*
2221          * Only the child register_netdev flows can handle priv_destructor
2222          * being set, so we force it to NULL here and handle manually until it
2223          * is safe to turn on.
2224          */
2225         priv->next_priv_destructor = dev->priv_destructor;
2226         dev->priv_destructor = NULL;
2227
2228         ipoib_build_priv(dev);
2229
2230         return 0;
2231
2232 out:
2233         kfree(priv);
2234         return rc;
2235 }
2236
2237 struct net_device *ipoib_intf_alloc(struct ib_device *hca, u32 port,
2238                                     const char *name)
2239 {
2240         struct net_device *dev;
2241         int rc;
2242
2243         dev = ipoib_alloc_netdev(hca, port, name);
2244         if (IS_ERR(dev))
2245                 return dev;
2246
2247         rc = ipoib_intf_init(hca, port, name, dev);
2248         if (rc) {
2249                 free_netdev(dev);
2250                 return ERR_PTR(rc);
2251         }
2252
2253         /*
2254          * Upon success the caller must ensure ipoib_intf_free is called or
2255          * register_netdevice succeed'd and priv_destructor is set to
2256          * ipoib_intf_free.
2257          */
2258         return dev;
2259 }
2260
2261 void ipoib_intf_free(struct net_device *dev)
2262 {
2263         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2264         struct rdma_netdev *rn = netdev_priv(dev);
2265
2266         dev->priv_destructor = priv->next_priv_destructor;
2267         if (dev->priv_destructor)
2268                 dev->priv_destructor(dev);
2269
2270         /*
2271          * There are some error flows around register_netdev failing that may
2272          * attempt to call priv_destructor twice, prevent that from happening.
2273          */
2274         dev->priv_destructor = NULL;
2275
2276         /* unregister/destroy is very complicated. Make bugs more obvious. */
2277         rn->clnt_priv = NULL;
2278
2279         kfree(priv);
2280 }
2281
2282 static ssize_t pkey_show(struct device *dev, struct device_attribute *attr,
2283                          char *buf)
2284 {
2285         struct net_device *ndev = to_net_dev(dev);
2286         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2287
2288         return sysfs_emit(buf, "0x%04x\n", priv->pkey);
2289 }
2290 static DEVICE_ATTR_RO(pkey);
2291
2292 static ssize_t umcast_show(struct device *dev, struct device_attribute *attr,
2293                            char *buf)
2294 {
2295         struct net_device *ndev = to_net_dev(dev);
2296         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2297
2298         return sysfs_emit(buf, "%d\n",
2299                           test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2300 }
2301
2302 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2303 {
2304         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2305
2306         if (umcast_val > 0) {
2307                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2308                 ipoib_warn(priv, "ignoring multicast groups joined directly "
2309                                 "by userspace\n");
2310         } else
2311                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2312 }
2313
2314 static ssize_t umcast_store(struct device *dev, struct device_attribute *attr,
2315                             const char *buf, size_t count)
2316 {
2317         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2318
2319         ipoib_set_umcast(to_net_dev(dev), umcast_val);
2320
2321         return count;
2322 }
2323 static DEVICE_ATTR_RW(umcast);
2324
2325 int ipoib_add_umcast_attr(struct net_device *dev)
2326 {
2327         return device_create_file(&dev->dev, &dev_attr_umcast);
2328 }
2329
2330 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2331 {
2332         struct ipoib_dev_priv *child_priv;
2333         struct net_device *netdev = priv->dev;
2334
2335         netif_addr_lock_bh(netdev);
2336
2337         memcpy(&priv->local_gid.global.interface_id,
2338                &gid->global.interface_id,
2339                sizeof(gid->global.interface_id));
2340         dev_addr_mod(netdev, 4, (u8 *)&priv->local_gid, sizeof(priv->local_gid));
2341         clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2342
2343         netif_addr_unlock_bh(netdev);
2344
2345         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2346                 down_read(&priv->vlan_rwsem);
2347                 list_for_each_entry(child_priv, &priv->child_intfs, list)
2348                         set_base_guid(child_priv, gid);
2349                 up_read(&priv->vlan_rwsem);
2350         }
2351 }
2352
2353 static int ipoib_check_lladdr(struct net_device *dev,
2354                               struct sockaddr_storage *ss)
2355 {
2356         union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2357         int ret = 0;
2358
2359         netif_addr_lock_bh(dev);
2360
2361         /* Make sure the QPN, reserved and subnet prefix match the current
2362          * lladdr, it also makes sure the lladdr is unicast.
2363          */
2364         if (memcmp(dev->dev_addr, ss->__data,
2365                    4 + sizeof(gid->global.subnet_prefix)) ||
2366             gid->global.interface_id == 0)
2367                 ret = -EINVAL;
2368
2369         netif_addr_unlock_bh(dev);
2370
2371         return ret;
2372 }
2373
2374 static int ipoib_set_mac(struct net_device *dev, void *addr)
2375 {
2376         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2377         struct sockaddr_storage *ss = addr;
2378         int ret;
2379
2380         if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2381                 return -EBUSY;
2382
2383         ret = ipoib_check_lladdr(dev, ss);
2384         if (ret)
2385                 return ret;
2386
2387         set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2388
2389         queue_work(ipoib_workqueue, &priv->flush_light);
2390
2391         return 0;
2392 }
2393
2394 static ssize_t create_child_store(struct device *dev,
2395                                   struct device_attribute *attr,
2396                                   const char *buf, size_t count)
2397 {
2398         int pkey;
2399         int ret;
2400
2401         if (sscanf(buf, "%i", &pkey) != 1)
2402                 return -EINVAL;
2403
2404         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2405                 return -EINVAL;
2406
2407         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2408
2409         return ret ? ret : count;
2410 }
2411 static DEVICE_ATTR_WO(create_child);
2412
2413 static ssize_t delete_child_store(struct device *dev,
2414                                   struct device_attribute *attr,
2415                                   const char *buf, size_t count)
2416 {
2417         int pkey;
2418         int ret;
2419
2420         if (sscanf(buf, "%i", &pkey) != 1)
2421                 return -EINVAL;
2422
2423         if (pkey < 0 || pkey > 0xffff)
2424                 return -EINVAL;
2425
2426         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2427
2428         return ret ? ret : count;
2429
2430 }
2431 static DEVICE_ATTR_WO(delete_child);
2432
2433 int ipoib_add_pkey_attr(struct net_device *dev)
2434 {
2435         return device_create_file(&dev->dev, &dev_attr_pkey);
2436 }
2437
2438 /*
2439  * We erroneously exposed the iface's port number in the dev_id
2440  * sysfs field long after dev_port was introduced for that purpose[1],
2441  * and we need to stop everyone from relying on that.
2442  * Let's overload the shower routine for the dev_id file here
2443  * to gently bring the issue up.
2444  *
2445  * [1] https://www.spinics.net/lists/netdev/msg272123.html
2446  */
2447 static ssize_t dev_id_show(struct device *dev,
2448                            struct device_attribute *attr, char *buf)
2449 {
2450         struct net_device *ndev = to_net_dev(dev);
2451
2452         /*
2453          * ndev->dev_port will be equal to 0 in old kernel prior to commit
2454          * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
2455          * port numbers") Zero was chosen as special case for user space
2456          * applications to fallback and query dev_id to check if it has
2457          * different value or not.
2458          *
2459          * Don't print warning in such scenario.
2460          *
2461          * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
2462          */
2463         if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
2464                 netdev_info_once(ndev,
2465                         "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
2466                         current->comm);
2467
2468         return sysfs_emit(buf, "%#x\n", ndev->dev_id);
2469 }
2470 static DEVICE_ATTR_RO(dev_id);
2471
2472 static int ipoib_intercept_dev_id_attr(struct net_device *dev)
2473 {
2474         device_remove_file(&dev->dev, &dev_attr_dev_id);
2475         return device_create_file(&dev->dev, &dev_attr_dev_id);
2476 }
2477
2478 static struct net_device *ipoib_add_port(const char *format,
2479                                          struct ib_device *hca, u32 port)
2480 {
2481         struct rtnl_link_ops *ops = ipoib_get_link_ops();
2482         struct rdma_netdev_alloc_params params;
2483         struct ipoib_dev_priv *priv;
2484         struct net_device *ndev;
2485         int result;
2486
2487         ndev = ipoib_intf_alloc(hca, port, format);
2488         if (IS_ERR(ndev)) {
2489                 pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port,
2490                         PTR_ERR(ndev));
2491                 return ndev;
2492         }
2493         priv = ipoib_priv(ndev);
2494
2495         INIT_IB_EVENT_HANDLER(&priv->event_handler,
2496                               priv->ca, ipoib_event);
2497         ib_register_event_handler(&priv->event_handler);
2498
2499         /* call event handler to ensure pkey in sync */
2500         queue_work(ipoib_workqueue, &priv->flush_heavy);
2501
2502         ndev->rtnl_link_ops = ipoib_get_link_ops();
2503
2504         result = register_netdev(ndev);
2505         if (result) {
2506                 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2507                         hca->name, port, result);
2508
2509                 ipoib_parent_unregister_pre(ndev);
2510                 ipoib_intf_free(ndev);
2511                 free_netdev(ndev);
2512
2513                 return ERR_PTR(result);
2514         }
2515
2516         if (hca->ops.rdma_netdev_get_params) {
2517                 int rc = hca->ops.rdma_netdev_get_params(hca, port,
2518                                                      RDMA_NETDEV_IPOIB,
2519                                                      &params);
2520
2521                 if (!rc && ops->priv_size < params.sizeof_priv)
2522                         ops->priv_size = params.sizeof_priv;
2523         }
2524         /*
2525          * We cannot set priv_destructor before register_netdev because we
2526          * need priv to be always valid during the error flow to execute
2527          * ipoib_parent_unregister_pre(). Instead handle it manually and only
2528          * enter priv_destructor mode once we are completely registered.
2529          */
2530         ndev->priv_destructor = ipoib_intf_free;
2531
2532         if (ipoib_intercept_dev_id_attr(ndev))
2533                 goto sysfs_failed;
2534         if (ipoib_cm_add_mode_attr(ndev))
2535                 goto sysfs_failed;
2536         if (ipoib_add_pkey_attr(ndev))
2537                 goto sysfs_failed;
2538         if (ipoib_add_umcast_attr(ndev))
2539                 goto sysfs_failed;
2540         if (device_create_file(&ndev->dev, &dev_attr_create_child))
2541                 goto sysfs_failed;
2542         if (device_create_file(&ndev->dev, &dev_attr_delete_child))
2543                 goto sysfs_failed;
2544
2545         return ndev;
2546
2547 sysfs_failed:
2548         ipoib_parent_unregister_pre(ndev);
2549         unregister_netdev(ndev);
2550         return ERR_PTR(-ENOMEM);
2551 }
2552
2553 static int ipoib_add_one(struct ib_device *device)
2554 {
2555         struct list_head *dev_list;
2556         struct net_device *dev;
2557         struct ipoib_dev_priv *priv;
2558         unsigned int p;
2559         int count = 0;
2560
2561         dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
2562         if (!dev_list)
2563                 return -ENOMEM;
2564
2565         INIT_LIST_HEAD(dev_list);
2566
2567         rdma_for_each_port (device, p) {
2568                 if (!rdma_protocol_ib(device, p))
2569                         continue;
2570                 dev = ipoib_add_port("ib%d", device, p);
2571                 if (!IS_ERR(dev)) {
2572                         priv = ipoib_priv(dev);
2573                         list_add_tail(&priv->list, dev_list);
2574                         count++;
2575                 }
2576         }
2577
2578         if (!count) {
2579                 kfree(dev_list);
2580                 return -EOPNOTSUPP;
2581         }
2582
2583         ib_set_client_data(device, &ipoib_client, dev_list);
2584         return 0;
2585 }
2586
2587 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2588 {
2589         struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2590         struct list_head *dev_list = client_data;
2591
2592         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2593                 LIST_HEAD(head);
2594                 ipoib_parent_unregister_pre(priv->dev);
2595
2596                 rtnl_lock();
2597
2598                 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
2599                                          list)
2600                         unregister_netdevice_queue(cpriv->dev, &head);
2601                 unregister_netdevice_queue(priv->dev, &head);
2602                 unregister_netdevice_many(&head);
2603
2604                 rtnl_unlock();
2605         }
2606
2607         kfree(dev_list);
2608 }
2609
2610 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2611 static struct notifier_block ipoib_netdev_notifier = {
2612         .notifier_call = ipoib_netdev_event,
2613 };
2614 #endif
2615
2616 static int __init ipoib_init_module(void)
2617 {
2618         int ret;
2619
2620         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2621         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2622         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2623
2624         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2625         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2626         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2627 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2628         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2629         ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2630 #endif
2631
2632         /*
2633          * When copying small received packets, we only copy from the
2634          * linear data part of the SKB, so we rely on this condition.
2635          */
2636         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2637
2638         ipoib_register_debugfs();
2639
2640         /*
2641          * We create a global workqueue here that is used for all flush
2642          * operations.  However, if you attempt to flush a workqueue
2643          * from a task on that same workqueue, it deadlocks the system.
2644          * We want to be able to flush the tasks associated with a
2645          * specific net device, so we also create a workqueue for each
2646          * netdevice.  We queue up the tasks for that device only on
2647          * its private workqueue, and we only queue up flush events
2648          * on our global flush workqueue.  This avoids the deadlocks.
2649          */
2650         ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
2651         if (!ipoib_workqueue) {
2652                 ret = -ENOMEM;
2653                 goto err_fs;
2654         }
2655
2656         ib_sa_register_client(&ipoib_sa_client);
2657
2658         ret = ib_register_client(&ipoib_client);
2659         if (ret)
2660                 goto err_sa;
2661
2662         ret = ipoib_netlink_init();
2663         if (ret)
2664                 goto err_client;
2665
2666 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2667         register_netdevice_notifier(&ipoib_netdev_notifier);
2668 #endif
2669         return 0;
2670
2671 err_client:
2672         ib_unregister_client(&ipoib_client);
2673
2674 err_sa:
2675         ib_sa_unregister_client(&ipoib_sa_client);
2676         destroy_workqueue(ipoib_workqueue);
2677
2678 err_fs:
2679         ipoib_unregister_debugfs();
2680
2681         return ret;
2682 }
2683
2684 static void __exit ipoib_cleanup_module(void)
2685 {
2686 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2687         unregister_netdevice_notifier(&ipoib_netdev_notifier);
2688 #endif
2689         ipoib_netlink_fini();
2690         ib_unregister_client(&ipoib_client);
2691         ib_sa_unregister_client(&ipoib_sa_client);
2692         ipoib_unregister_debugfs();
2693         destroy_workqueue(ipoib_workqueue);
2694 }
2695
2696 module_init(ipoib_init_module);
2697 module_exit(ipoib_cleanup_module);