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 #include <linux/pci.h>
  55
  56 #define DRV_VERSION "1.0.0"
  57
  58 const char ipoib_driver_version[] = DRV_VERSION;
  59
  60 MODULE_AUTHOR("Roland Dreier");
  61 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  62 MODULE_LICENSE("Dual BSD/GPL");
  63 MODULE_VERSION(DRV_VERSION);
  64
  65 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  66 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  67
  68 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  69 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  70 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  71 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  72
  73 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  74 int ipoib_debug_level;
  75
  76 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  77 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  78 #endif
  79
  80 struct ipoib_path_iter {
  81         struct net_device *dev;
  82         struct ipoib_path  path;
  83 };
  84
  85 static const u8 ipv4_bcast_addr[] = {
  86         0x00, 0xff, 0xff, 0xff,
  87         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  88         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  89 };
  90
  91 struct workqueue_struct *ipoib_workqueue;
  92
  93 struct ib_sa_client ipoib_sa_client;
  94
  95 static void ipoib_add_one(struct ib_device *device);
  96 static void ipoib_remove_one(struct ib_device *device, void *client_data);
  97 static void ipoib_neigh_reclaim(struct rcu_head *rp);
  98 static struct net_device *ipoib_get_net_dev_by_params(
  99                 struct ib_device *dev, u8 port, u16 pkey,
 100                 const union ib_gid *gid, const struct sockaddr *addr,
 101                 void *client_data);
 102
 103 static struct ib_client ipoib_client = {
 104         .name   = "ipoib",
 105         .add    = ipoib_add_one,
 106         .remove = ipoib_remove_one,
 107         .get_net_dev_by_params = ipoib_get_net_dev_by_params,
 108 };
 109
 110 int ipoib_open(struct net_device *dev)
 111 {
 112         struct ipoib_dev_priv *priv = netdev_priv(dev);
 113
 114         ipoib_dbg(priv, "bringing up interface\n");
 115
 116         netif_carrier_off(dev);
 117
 118         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 119
 120         priv->sm_fullmember_sendonly_support = false;
 121
 122         if (ipoib_ib_dev_open(dev)) {
 123                 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 124                         return 0;
 125                 goto err_disable;
 126         }
 127
 128         if (ipoib_ib_dev_up(dev))
 129                 goto err_stop;
 130
 131         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 132                 struct ipoib_dev_priv *cpriv;
 133
 134                 /* Bring up any child interfaces too */
 135                 down_read(&priv->vlan_rwsem);
 136                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 137                         int flags;
 138
 139                         flags = cpriv->dev->flags;
 140                         if (flags & IFF_UP)
 141                                 continue;
 142
 143                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 144                 }
 145                 up_read(&priv->vlan_rwsem);
 146         }
 147
 148         netif_start_queue(dev);
 149
 150         return 0;
 151
 152 err_stop:
 153         ipoib_ib_dev_stop(dev);
 154
 155 err_disable:
 156         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 157
 158         return -EINVAL;
 159 }
 160
 161 static int ipoib_stop(struct net_device *dev)
 162 {
 163         struct ipoib_dev_priv *priv = netdev_priv(dev);
 164
 165         ipoib_dbg(priv, "stopping interface\n");
 166
 167         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 168
 169         netif_stop_queue(dev);
 170
 171         ipoib_ib_dev_down(dev);
 172         ipoib_ib_dev_stop(dev);
 173
 174         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 175                 struct ipoib_dev_priv *cpriv;
 176
 177                 /* Bring down any child interfaces too */
 178                 down_read(&priv->vlan_rwsem);
 179                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 180                         int flags;
 181
 182                         flags = cpriv->dev->flags;
 183                         if (!(flags & IFF_UP))
 184                                 continue;
 185
 186                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 187                 }
 188                 up_read(&priv->vlan_rwsem);
 189         }
 190
 191         return 0;
 192 }
 193
 194 static void ipoib_uninit(struct net_device *dev)
 195 {
 196         ipoib_dev_cleanup(dev);
 197 }
 198
 199 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 200 {
 201         struct ipoib_dev_priv *priv = netdev_priv(dev);
 202
 203         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 204                 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 205
 206         return features;
 207 }
 208
 209 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 210 {
 211         struct ipoib_dev_priv *priv = netdev_priv(dev);
 212
 213         /* dev->mtu > 2K ==> connected mode */
 214         if (ipoib_cm_admin_enabled(dev)) {
 215                 if (new_mtu > ipoib_cm_max_mtu(dev))
 216                         return -EINVAL;
 217
 218                 if (new_mtu > priv->mcast_mtu)
 219                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 220                                    priv->mcast_mtu);
 221
 222                 dev->mtu = new_mtu;
 223                 return 0;
 224         }
 225
 226         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 227                 return -EINVAL;
 228
 229         priv->admin_mtu = new_mtu;
 230
 231         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 232
 233         return 0;
 234 }
 235
 236 /* Called with an RCU read lock taken */
 237 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
 238                                         struct net_device *dev)
 239 {
 240         struct net *net = dev_net(dev);
 241         struct in_device *in_dev;
 242         struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
 243         struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
 244         __be32 ret_addr;
 245
 246         switch (addr->sa_family) {
 247         case AF_INET:
 248                 in_dev = in_dev_get(dev);
 249                 if (!in_dev)
 250                         return false;
 251
 252                 ret_addr = inet_confirm_addr(net, in_dev, 0,
 253                                              addr_in->sin_addr.s_addr,
 254                                              RT_SCOPE_HOST);
 255                 in_dev_put(in_dev);
 256                 if (ret_addr)
 257                         return true;
 258
 259                 break;
 260         case AF_INET6:
 261                 if (IS_ENABLED(CONFIG_IPV6) &&
 262                     ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
 263                         return true;
 264
 265                 break;
 266         }
 267         return false;
 268 }
 269
 270 /**
 271  * Find the master net_device on top of the given net_device.
 272  * @dev: base IPoIB net_device
 273  *
 274  * Returns the master net_device with a reference held, or the same net_device
 275  * if no master exists.
 276  */
 277 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
 278 {
 279         struct net_device *master;
 280
 281         rcu_read_lock();
 282         master = netdev_master_upper_dev_get_rcu(dev);
 283         if (master)
 284                 dev_hold(master);
 285         rcu_read_unlock();
 286
 287         if (master)
 288                 return master;
 289
 290         dev_hold(dev);
 291         return dev;
 292 }
 293
 294 /**
 295  * Find a net_device matching the given address, which is an upper device of
 296  * the given net_device.
 297  * @addr: IP address to look for.
 298  * @dev: base IPoIB net_device
 299  *
 300  * If found, returns the net_device with a reference held. Otherwise return
 301  * NULL.
 302  */
 303 static struct net_device *ipoib_get_net_dev_match_addr(
 304                 const struct sockaddr *addr, struct net_device *dev)
 305 {
 306         struct net_device *upper,
 307                           *result = NULL;
 308         struct list_head *iter;
 309
 310         rcu_read_lock();
 311         if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
 312                 dev_hold(dev);
 313                 result = dev;
 314                 goto out;
 315         }
 316
 317         netdev_for_each_all_upper_dev_rcu(dev, upper, iter) {
 318                 if (ipoib_is_dev_match_addr_rcu(addr, upper)) {
 319                         dev_hold(upper);
 320                         result = upper;
 321                         break;
 322                 }
 323         }
 324 out:
 325         rcu_read_unlock();
 326         return result;
 327 }
 328
 329 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
 330  * pkey_index and address, if one exists.
 331  *
 332  * @found_net_dev: contains a matching net_device if the return value >= 1,
 333  * with a reference held. */
 334 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
 335                                      const union ib_gid *gid,
 336                                      u16 pkey_index,
 337                                      const struct sockaddr *addr,
 338                                      int nesting,
 339                                      struct net_device **found_net_dev)
 340 {
 341         struct ipoib_dev_priv *child_priv;
 342         struct net_device *net_dev = NULL;
 343         int matches = 0;
 344
 345         if (priv->pkey_index == pkey_index &&
 346             (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
 347                 if (!addr) {
 348                         net_dev = ipoib_get_master_net_dev(priv->dev);
 349                 } else {
 350                         /* Verify the net_device matches the IP address, as
 351                          * IPoIB child devices currently share a GID. */
 352                         net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
 353                 }
 354                 if (net_dev) {
 355                         if (!*found_net_dev)
 356                                 *found_net_dev = net_dev;
 357                         else
 358                                 dev_put(net_dev);
 359                         ++matches;
 360                 }
 361         }
 362
 363         /* Check child interfaces */
 364         down_read_nested(&priv->vlan_rwsem, nesting);
 365         list_for_each_entry(child_priv, &priv->child_intfs, list) {
 366                 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
 367                                                     pkey_index, addr,
 368                                                     nesting + 1,
 369                                                     found_net_dev);
 370                 if (matches > 1)
 371                         break;
 372         }
 373         up_read(&priv->vlan_rwsem);
 374
 375         return matches;
 376 }
 377
 378 /* Returns the number of matching net_devs found (between 0 and 2). Also
 379  * return the matching net_device in the @net_dev parameter, holding a
 380  * reference to the net_device, if the number of matches >= 1 */
 381 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
 382                                          u16 pkey_index,
 383                                          const union ib_gid *gid,
 384                                          const struct sockaddr *addr,
 385                                          struct net_device **net_dev)
 386 {
 387         struct ipoib_dev_priv *priv;
 388         int matches = 0;
 389
 390         *net_dev = NULL;
 391
 392         list_for_each_entry(priv, dev_list, list) {
 393                 if (priv->port != port)
 394                         continue;
 395
 396                 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
 397                                                      addr, 0, net_dev);
 398                 if (matches > 1)
 399                         break;
 400         }
 401
 402         return matches;
 403 }
 404
 405 static struct net_device *ipoib_get_net_dev_by_params(
 406                 struct ib_device *dev, u8 port, u16 pkey,
 407                 const union ib_gid *gid, const struct sockaddr *addr,
 408                 void *client_data)
 409 {
 410         struct net_device *net_dev;
 411         struct list_head *dev_list = client_data;
 412         u16 pkey_index;
 413         int matches;
 414         int ret;
 415
 416         if (!rdma_protocol_ib(dev, port))
 417                 return NULL;
 418
 419         ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
 420         if (ret)
 421                 return NULL;
 422
 423         if (!dev_list)
 424                 return NULL;
 425
 426         /* See if we can find a unique device matching the L2 parameters */
 427         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 428                                                 gid, NULL, &net_dev);
 429
 430         switch (matches) {
 431         case 0:
 432                 return NULL;
 433         case 1:
 434                 return net_dev;
 435         }
 436
 437         dev_put(net_dev);
 438
 439         /* Couldn't find a unique device with L2 parameters only. Use L3
 440          * address to uniquely match the net device */
 441         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 442                                                 gid, addr, &net_dev);
 443         switch (matches) {
 444         case 0:
 445                 return NULL;
 446         default:
 447                 dev_warn_ratelimited(&dev->dev,
 448                                      "duplicate IP address detected\n");
 449                 /* Fall through */
 450         case 1:
 451                 return net_dev;
 452         }
 453 }
 454
 455 int ipoib_set_mode(struct net_device *dev, const char *buf)
 456 {
 457         struct ipoib_dev_priv *priv = netdev_priv(dev);
 458
 459         /* flush paths if we switch modes so that connections are restarted */
 460         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
 461                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 462                 ipoib_warn(priv, "enabling connected mode "
 463                            "will cause multicast packet drops\n");
 464                 netdev_update_features(dev);
 465                 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
 466                 rtnl_unlock();
 467                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 468
 469                 ipoib_flush_paths(dev);
 470                 rtnl_lock();
 471                 return 0;
 472         }
 473
 474         if (!strcmp(buf, "datagram\n")) {
 475                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 476                 netdev_update_features(dev);
 477                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 478                 rtnl_unlock();
 479                 ipoib_flush_paths(dev);
 480                 rtnl_lock();
 481                 return 0;
 482         }
 483
 484         return -EINVAL;
 485 }
 486
 487 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 488 {
 489         struct ipoib_dev_priv *priv = netdev_priv(dev);
 490         struct rb_node *n = priv->path_tree.rb_node;
 491         struct ipoib_path *path;
 492         int ret;
 493
 494         while (n) {
 495                 path = rb_entry(n, struct ipoib_path, rb_node);
 496
 497                 ret = memcmp(gid, path->pathrec.dgid.raw,
 498                              sizeof (union ib_gid));
 499
 500                 if (ret < 0)
 501                         n = n->rb_left;
 502                 else if (ret > 0)
 503                         n = n->rb_right;
 504                 else
 505                         return path;
 506         }
 507
 508         return NULL;
 509 }
 510
 511 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 512 {
 513         struct ipoib_dev_priv *priv = netdev_priv(dev);
 514         struct rb_node **n = &priv->path_tree.rb_node;
 515         struct rb_node *pn = NULL;
 516         struct ipoib_path *tpath;
 517         int ret;
 518
 519         while (*n) {
 520                 pn = *n;
 521                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 522
 523                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 524                              sizeof (union ib_gid));
 525                 if (ret < 0)
 526                         n = &pn->rb_left;
 527                 else if (ret > 0)
 528                         n = &pn->rb_right;
 529                 else
 530                         return -EEXIST;
 531         }
 532
 533         rb_link_node(&path->rb_node, pn, n);
 534         rb_insert_color(&path->rb_node, &priv->path_tree);
 535
 536         list_add_tail(&path->list, &priv->path_list);
 537
 538         return 0;
 539 }
 540
 541 static void path_free(struct net_device *dev, struct ipoib_path *path)
 542 {
 543         struct sk_buff *skb;
 544
 545         while ((skb = __skb_dequeue(&path->queue)))
 546                 dev_kfree_skb_irq(skb);
 547
 548         ipoib_dbg(netdev_priv(dev), "path_free\n");
 549
 550         /* remove all neigh connected to this path */
 551         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 552
 553         if (path->ah)
 554                 ipoib_put_ah(path->ah);
 555
 556         kfree(path);
 557 }
 558
 559 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 560
 561 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 562 {
 563         struct ipoib_path_iter *iter;
 564
 565         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 566         if (!iter)
 567                 return NULL;
 568
 569         iter->dev = dev;
 570         memset(iter->path.pathrec.dgid.raw, 0, 16);
 571
 572         if (ipoib_path_iter_next(iter)) {
 573                 kfree(iter);
 574                 return NULL;
 575         }
 576
 577         return iter;
 578 }
 579
 580 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 581 {
 582         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 583         struct rb_node *n;
 584         struct ipoib_path *path;
 585         int ret = 1;
 586
 587         spin_lock_irq(&priv->lock);
 588
 589         n = rb_first(&priv->path_tree);
 590
 591         while (n) {
 592                 path = rb_entry(n, struct ipoib_path, rb_node);
 593
 594                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 595                            sizeof (union ib_gid)) < 0) {
 596                         iter->path = *path;
 597                         ret = 0;
 598                         break;
 599                 }
 600
 601                 n = rb_next(n);
 602         }
 603
 604         spin_unlock_irq(&priv->lock);
 605
 606         return ret;
 607 }
 608
 609 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 610                           struct ipoib_path *path)
 611 {
 612         *path = iter->path;
 613 }
 614
 615 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 616
 617 void ipoib_mark_paths_invalid(struct net_device *dev)
 618 {
 619         struct ipoib_dev_priv *priv = netdev_priv(dev);
 620         struct ipoib_path *path, *tp;
 621
 622         spin_lock_irq(&priv->lock);
 623
 624         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 625                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
 626                         be16_to_cpu(path->pathrec.dlid),
 627                         path->pathrec.dgid.raw);
 628                 path->valid =  0;
 629         }
 630
 631         spin_unlock_irq(&priv->lock);
 632 }
 633
 634 struct classport_info_context {
 635         struct ipoib_dev_priv   *priv;
 636         struct completion       done;
 637         struct ib_sa_query      *sa_query;
 638 };
 639
 640 static void classport_info_query_cb(int status, struct ib_class_port_info *rec,
 641                                     void *context)
 642 {
 643         struct classport_info_context *cb_ctx = context;
 644         struct ipoib_dev_priv *priv;
 645
 646         WARN_ON(!context);
 647
 648         priv = cb_ctx->priv;
 649
 650         if (status || !rec) {
 651                 pr_debug("device: %s failed query classport_info status: %d\n",
 652                          priv->dev->name, status);
 653                 /* keeps the default, will try next mcast_restart */
 654                 priv->sm_fullmember_sendonly_support = false;
 655                 goto out;
 656         }
 657
 658         if (ib_get_cpi_capmask2(rec) &
 659             IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT) {
 660                 pr_debug("device: %s enabled fullmember-sendonly for sendonly MCG\n",
 661                          priv->dev->name);
 662                 priv->sm_fullmember_sendonly_support = true;
 663         } else {
 664                 pr_debug("device: %s disabled fullmember-sendonly for sendonly MCG\n",
 665                          priv->dev->name);
 666                 priv->sm_fullmember_sendonly_support = false;
 667         }
 668
 669 out:
 670         complete(&cb_ctx->done);
 671 }
 672
 673 int ipoib_check_sm_sendonly_fullmember_support(struct ipoib_dev_priv *priv)
 674 {
 675         struct classport_info_context *callback_context;
 676         int ret;
 677
 678         callback_context = kmalloc(sizeof(*callback_context), GFP_KERNEL);
 679         if (!callback_context)
 680                 return -ENOMEM;
 681
 682         callback_context->priv = priv;
 683         init_completion(&callback_context->done);
 684
 685         ret = ib_sa_classport_info_rec_query(&ipoib_sa_client,
 686                                              priv->ca, priv->port, 3000,
 687                                              GFP_KERNEL,
 688                                              classport_info_query_cb,
 689                                              callback_context,
 690                                              &callback_context->sa_query);
 691         if (ret < 0) {
 692                 pr_info("%s failed to send ib_sa_classport_info query, ret: %d\n",
 693                         priv->dev->name, ret);
 694                 kfree(callback_context);
 695                 return ret;
 696         }
 697
 698         /* waiting for the callback to finish before returnning */
 699         wait_for_completion(&callback_context->done);
 700         kfree(callback_context);
 701
 702         return ret;
 703 }
 704
 705 void ipoib_flush_paths(struct net_device *dev)
 706 {
 707         struct ipoib_dev_priv *priv = netdev_priv(dev);
 708         struct ipoib_path *path, *tp;
 709         LIST_HEAD(remove_list);
 710         unsigned long flags;
 711
 712         netif_tx_lock_bh(dev);
 713         spin_lock_irqsave(&priv->lock, flags);
 714
 715         list_splice_init(&priv->path_list, &remove_list);
 716
 717         list_for_each_entry(path, &remove_list, list)
 718                 rb_erase(&path->rb_node, &priv->path_tree);
 719
 720         list_for_each_entry_safe(path, tp, &remove_list, list) {
 721                 if (path->query)
 722                         ib_sa_cancel_query(path->query_id, path->query);
 723                 spin_unlock_irqrestore(&priv->lock, flags);
 724                 netif_tx_unlock_bh(dev);
 725                 wait_for_completion(&path->done);
 726                 path_free(dev, path);
 727                 netif_tx_lock_bh(dev);
 728                 spin_lock_irqsave(&priv->lock, flags);
 729         }
 730
 731         spin_unlock_irqrestore(&priv->lock, flags);
 732         netif_tx_unlock_bh(dev);
 733 }
 734
 735 static void path_rec_completion(int status,
 736                                 struct ib_sa_path_rec *pathrec,
 737                                 void *path_ptr)
 738 {
 739         struct ipoib_path *path = path_ptr;
 740         struct net_device *dev = path->dev;
 741         struct ipoib_dev_priv *priv = netdev_priv(dev);
 742         struct ipoib_ah *ah = NULL;
 743         struct ipoib_ah *old_ah = NULL;
 744         struct ipoib_neigh *neigh, *tn;
 745         struct sk_buff_head skqueue;
 746         struct sk_buff *skb;
 747         unsigned long flags;
 748
 749         if (!status)
 750                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 751                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
 752         else
 753                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 754                           status, path->pathrec.dgid.raw);
 755
 756         skb_queue_head_init(&skqueue);
 757
 758         if (!status) {
 759                 struct ib_ah_attr av;
 760
 761                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 762                         ah = ipoib_create_ah(dev, priv->pd, &av);
 763         }
 764
 765         spin_lock_irqsave(&priv->lock, flags);
 766
 767         if (!IS_ERR_OR_NULL(ah)) {
 768                 path->pathrec = *pathrec;
 769
 770                 old_ah   = path->ah;
 771                 path->ah = ah;
 772
 773                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 774                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 775
 776                 while ((skb = __skb_dequeue(&path->queue)))
 777                         __skb_queue_tail(&skqueue, skb);
 778
 779                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 780                         if (neigh->ah) {
 781                                 WARN_ON(neigh->ah != old_ah);
 782                                 /*
 783                                  * Dropping the ah reference inside
 784                                  * priv->lock is safe here, because we
 785                                  * will hold one more reference from
 786                                  * the original value of path->ah (ie
 787                                  * old_ah).
 788                                  */
 789                                 ipoib_put_ah(neigh->ah);
 790                         }
 791                         kref_get(&path->ah->ref);
 792                         neigh->ah = path->ah;
 793
 794                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 795                                 if (!ipoib_cm_get(neigh))
 796                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 797                                                                                path,
 798                                                                                neigh));
 799                                 if (!ipoib_cm_get(neigh)) {
 800                                         ipoib_neigh_free(neigh);
 801                                         continue;
 802                                 }
 803                         }
 804
 805                         while ((skb = __skb_dequeue(&neigh->queue)))
 806                                 __skb_queue_tail(&skqueue, skb);
 807                 }
 808                 path->valid = 1;
 809         }
 810
 811         path->query = NULL;
 812         complete(&path->done);
 813
 814         spin_unlock_irqrestore(&priv->lock, flags);
 815
 816         if (IS_ERR_OR_NULL(ah))
 817                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 818
 819         if (old_ah)
 820                 ipoib_put_ah(old_ah);
 821
 822         while ((skb = __skb_dequeue(&skqueue))) {
 823                 skb->dev = dev;
 824                 if (dev_queue_xmit(skb))
 825                         ipoib_warn(priv, "dev_queue_xmit failed "
 826                                    "to requeue packet\n");
 827         }
 828 }
 829
 830 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 831 {
 832         struct ipoib_dev_priv *priv = netdev_priv(dev);
 833         struct ipoib_path *path;
 834
 835         if (!priv->broadcast)
 836                 return NULL;
 837
 838         path = kzalloc(sizeof *path, GFP_ATOMIC);
 839         if (!path)
 840                 return NULL;
 841
 842         path->dev = dev;
 843
 844         skb_queue_head_init(&path->queue);
 845
 846         INIT_LIST_HEAD(&path->neigh_list);
 847
 848         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 849         path->pathrec.sgid          = priv->local_gid;
 850         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 851         path->pathrec.numb_path     = 1;
 852         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 853
 854         return path;
 855 }
 856
 857 static int path_rec_start(struct net_device *dev,
 858                           struct ipoib_path *path)
 859 {
 860         struct ipoib_dev_priv *priv = netdev_priv(dev);
 861
 862         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 863                   path->pathrec.dgid.raw);
 864
 865         init_completion(&path->done);
 866
 867         path->query_id =
 868                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 869                                    &path->pathrec,
 870                                    IB_SA_PATH_REC_DGID          |
 871                                    IB_SA_PATH_REC_SGID          |
 872                                    IB_SA_PATH_REC_NUMB_PATH     |
 873                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 874                                    IB_SA_PATH_REC_PKEY,
 875                                    1000, GFP_ATOMIC,
 876                                    path_rec_completion,
 877                                    path, &path->query);
 878         if (path->query_id < 0) {
 879                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 880                 path->query = NULL;
 881                 complete(&path->done);
 882                 return path->query_id;
 883         }
 884
 885         return 0;
 886 }
 887
 888 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
 889                            struct net_device *dev)
 890 {
 891         struct ipoib_dev_priv *priv = netdev_priv(dev);
 892         struct ipoib_path *path;
 893         struct ipoib_neigh *neigh;
 894         unsigned long flags;
 895
 896         spin_lock_irqsave(&priv->lock, flags);
 897         neigh = ipoib_neigh_alloc(daddr, dev);
 898         if (!neigh) {
 899                 spin_unlock_irqrestore(&priv->lock, flags);
 900                 ++dev->stats.tx_dropped;
 901                 dev_kfree_skb_any(skb);
 902                 return;
 903         }
 904
 905         path = __path_find(dev, daddr + 4);
 906         if (!path) {
 907                 path = path_rec_create(dev, daddr + 4);
 908                 if (!path)
 909                         goto err_path;
 910
 911                 __path_add(dev, path);
 912         }
 913
 914         list_add_tail(&neigh->list, &path->neigh_list);
 915
 916         if (path->ah) {
 917                 kref_get(&path->ah->ref);
 918                 neigh->ah = path->ah;
 919
 920                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 921                         if (!ipoib_cm_get(neigh))
 922                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 923                         if (!ipoib_cm_get(neigh)) {
 924                                 ipoib_neigh_free(neigh);
 925                                 goto err_drop;
 926                         }
 927                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 928                                 __skb_queue_tail(&neigh->queue, skb);
 929                         else {
 930                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 931                                            skb_queue_len(&neigh->queue));
 932                                 goto err_drop;
 933                         }
 934                 } else {
 935                         spin_unlock_irqrestore(&priv->lock, flags);
 936                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
 937                         ipoib_neigh_put(neigh);
 938                         return;
 939                 }
 940         } else {
 941                 neigh->ah  = NULL;
 942
 943                 if (!path->query && path_rec_start(dev, path))
 944                         goto err_path;
 945                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 946                         __skb_queue_tail(&neigh->queue, skb);
 947                 else
 948                         goto err_drop;
 949         }
 950
 951         spin_unlock_irqrestore(&priv->lock, flags);
 952         ipoib_neigh_put(neigh);
 953         return;
 954
 955 err_path:
 956         ipoib_neigh_free(neigh);
 957 err_drop:
 958         ++dev->stats.tx_dropped;
 959         dev_kfree_skb_any(skb);
 960
 961         spin_unlock_irqrestore(&priv->lock, flags);
 962         ipoib_neigh_put(neigh);
 963 }
 964
 965 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 966                              struct ipoib_cb *cb)
 967 {
 968         struct ipoib_dev_priv *priv = netdev_priv(dev);
 969         struct ipoib_path *path;
 970         unsigned long flags;
 971
 972         spin_lock_irqsave(&priv->lock, flags);
 973
 974         path = __path_find(dev, cb->hwaddr + 4);
 975         if (!path || !path->valid) {
 976                 int new_path = 0;
 977
 978                 if (!path) {
 979                         path = path_rec_create(dev, cb->hwaddr + 4);
 980                         new_path = 1;
 981                 }
 982                 if (path) {
 983                         if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 984                                 __skb_queue_tail(&path->queue, skb);
 985                         } else {
 986                                 ++dev->stats.tx_dropped;
 987                                 dev_kfree_skb_any(skb);
 988                         }
 989
 990                         if (!path->query && path_rec_start(dev, path)) {
 991                                 spin_unlock_irqrestore(&priv->lock, flags);
 992                                 if (new_path)
 993                                         path_free(dev, path);
 994                                 return;
 995                         } else
 996                                 __path_add(dev, path);
 997                 } else {
 998                         ++dev->stats.tx_dropped;
 999                         dev_kfree_skb_any(skb);
1000                 }
1001
1002                 spin_unlock_irqrestore(&priv->lock, flags);
1003                 return;
1004         }
1005
1006         if (path->ah) {
1007                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
1008                           be16_to_cpu(path->pathrec.dlid));
1009
1010                 spin_unlock_irqrestore(&priv->lock, flags);
1011                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
1012                 return;
1013         } else if ((path->query || !path_rec_start(dev, path)) &&
1014                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1015                 __skb_queue_tail(&path->queue, skb);
1016         } else {
1017                 ++dev->stats.tx_dropped;
1018                 dev_kfree_skb_any(skb);
1019         }
1020
1021         spin_unlock_irqrestore(&priv->lock, flags);
1022 }
1023
1024 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1025 {
1026         struct ipoib_dev_priv *priv = netdev_priv(dev);
1027         struct ipoib_neigh *neigh;
1028         struct ipoib_cb *cb = ipoib_skb_cb(skb);
1029         struct ipoib_header *header;
1030         unsigned long flags;
1031
1032         header = (struct ipoib_header *) skb->data;
1033
1034         if (unlikely(cb->hwaddr[4] == 0xff)) {
1035                 /* multicast, arrange "if" according to probability */
1036                 if ((header->proto != htons(ETH_P_IP)) &&
1037                     (header->proto != htons(ETH_P_IPV6)) &&
1038                     (header->proto != htons(ETH_P_ARP)) &&
1039                     (header->proto != htons(ETH_P_RARP)) &&
1040                     (header->proto != htons(ETH_P_TIPC))) {
1041                         /* ethertype not supported by IPoIB */
1042                         ++dev->stats.tx_dropped;
1043                         dev_kfree_skb_any(skb);
1044                         return NETDEV_TX_OK;
1045                 }
1046                 /* Add in the P_Key for multicast*/
1047                 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1048                 cb->hwaddr[9] = priv->pkey & 0xff;
1049
1050                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
1051                 if (likely(neigh))
1052                         goto send_using_neigh;
1053                 ipoib_mcast_send(dev, cb->hwaddr, skb);
1054                 return NETDEV_TX_OK;
1055         }
1056
1057         /* unicast, arrange "switch" according to probability */
1058         switch (header->proto) {
1059         case htons(ETH_P_IP):
1060         case htons(ETH_P_IPV6):
1061         case htons(ETH_P_TIPC):
1062                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
1063                 if (unlikely(!neigh)) {
1064                         neigh_add_path(skb, cb->hwaddr, dev);
1065                         return NETDEV_TX_OK;
1066                 }
1067                 break;
1068         case htons(ETH_P_ARP):
1069         case htons(ETH_P_RARP):
1070                 /* for unicast ARP and RARP should always perform path find */
1071                 unicast_arp_send(skb, dev, cb);
1072                 return NETDEV_TX_OK;
1073         default:
1074                 /* ethertype not supported by IPoIB */
1075                 ++dev->stats.tx_dropped;
1076                 dev_kfree_skb_any(skb);
1077                 return NETDEV_TX_OK;
1078         }
1079
1080 send_using_neigh:
1081         /* note we now hold a ref to neigh */
1082         if (ipoib_cm_get(neigh)) {
1083                 if (ipoib_cm_up(neigh)) {
1084                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1085                         goto unref;
1086                 }
1087         } else if (neigh->ah) {
1088                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
1089                 goto unref;
1090         }
1091
1092         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1093                 spin_lock_irqsave(&priv->lock, flags);
1094                 __skb_queue_tail(&neigh->queue, skb);
1095                 spin_unlock_irqrestore(&priv->lock, flags);
1096         } else {
1097                 ++dev->stats.tx_dropped;
1098                 dev_kfree_skb_any(skb);
1099         }
1100
1101 unref:
1102         ipoib_neigh_put(neigh);
1103
1104         return NETDEV_TX_OK;
1105 }
1106
1107 static void ipoib_timeout(struct net_device *dev)
1108 {
1109         struct ipoib_dev_priv *priv = netdev_priv(dev);
1110
1111         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1112                    jiffies_to_msecs(jiffies - dev->trans_start));
1113         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1114                    netif_queue_stopped(dev),
1115                    priv->tx_head, priv->tx_tail);
1116         /* XXX reset QP, etc. */
1117 }
1118
1119 static int ipoib_hard_header(struct sk_buff *skb,
1120                              struct net_device *dev,
1121                              unsigned short type,
1122                              const void *daddr, const void *saddr, unsigned len)
1123 {
1124         struct ipoib_header *header;
1125         struct ipoib_cb *cb = ipoib_skb_cb(skb);
1126
1127         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
1128
1129         header->proto = htons(type);
1130         header->reserved = 0;
1131
1132         /*
1133          * we don't rely on dst_entry structure,  always stuff the
1134          * destination address into skb->cb so we can figure out where
1135          * to send the packet later.
1136          */
1137         memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
1138
1139         return sizeof *header;
1140 }
1141
1142 static void ipoib_set_mcast_list(struct net_device *dev)
1143 {
1144         struct ipoib_dev_priv *priv = netdev_priv(dev);
1145
1146         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1147                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1148                 return;
1149         }
1150
1151         queue_work(priv->wq, &priv->restart_task);
1152 }
1153
1154 static int ipoib_get_iflink(const struct net_device *dev)
1155 {
1156         struct ipoib_dev_priv *priv = netdev_priv(dev);
1157
1158         /* parent interface */
1159         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1160                 return dev->ifindex;
1161
1162         /* child/vlan interface */
1163         return priv->parent->ifindex;
1164 }
1165
1166 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1167 {
1168         /*
1169          * Use only the address parts that contributes to spreading
1170          * The subnet prefix is not used as one can not connect to
1171          * same remote port (GUID) using the same remote QPN via two
1172          * different subnets.
1173          */
1174          /* qpn octets[1:4) & port GUID octets[12:20) */
1175         u32 *d32 = (u32 *) daddr;
1176         u32 hv;
1177
1178         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1179         return hv & htbl->mask;
1180 }
1181
1182 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1183 {
1184         struct ipoib_dev_priv *priv = netdev_priv(dev);
1185         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1186         struct ipoib_neigh_hash *htbl;
1187         struct ipoib_neigh *neigh = NULL;
1188         u32 hash_val;
1189
1190         rcu_read_lock_bh();
1191
1192         htbl = rcu_dereference_bh(ntbl->htbl);
1193
1194         if (!htbl)
1195                 goto out_unlock;
1196
1197         hash_val = ipoib_addr_hash(htbl, daddr);
1198         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1199              neigh != NULL;
1200              neigh = rcu_dereference_bh(neigh->hnext)) {
1201                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1202                         /* found, take one ref on behalf of the caller */
1203                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1204                                 /* deleted */
1205                                 neigh = NULL;
1206                                 goto out_unlock;
1207                         }
1208                         neigh->alive = jiffies;
1209                         goto out_unlock;
1210                 }
1211         }
1212
1213 out_unlock:
1214         rcu_read_unlock_bh();
1215         return neigh;
1216 }
1217
1218 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1219 {
1220         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1221         struct ipoib_neigh_hash *htbl;
1222         unsigned long neigh_obsolete;
1223         unsigned long dt;
1224         unsigned long flags;
1225         int i;
1226         LIST_HEAD(remove_list);
1227
1228         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1229                 return;
1230
1231         spin_lock_irqsave(&priv->lock, flags);
1232
1233         htbl = rcu_dereference_protected(ntbl->htbl,
1234                                          lockdep_is_held(&priv->lock));
1235
1236         if (!htbl)
1237                 goto out_unlock;
1238
1239         /* neigh is obsolete if it was idle for two GC periods */
1240         dt = 2 * arp_tbl.gc_interval;
1241         neigh_obsolete = jiffies - dt;
1242         /* handle possible race condition */
1243         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1244                 goto out_unlock;
1245
1246         for (i = 0; i < htbl->size; i++) {
1247                 struct ipoib_neigh *neigh;
1248                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1249
1250                 while ((neigh = rcu_dereference_protected(*np,
1251                                                           lockdep_is_held(&priv->lock))) != NULL) {
1252                         /* was the neigh idle for two GC periods */
1253                         if (time_after(neigh_obsolete, neigh->alive)) {
1254
1255                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1256
1257                                 rcu_assign_pointer(*np,
1258                                                    rcu_dereference_protected(neigh->hnext,
1259                                                                              lockdep_is_held(&priv->lock)));
1260                                 /* remove from path/mc list */
1261                                 list_del(&neigh->list);
1262                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1263                         } else {
1264                                 np = &neigh->hnext;
1265                         }
1266
1267                 }
1268         }
1269
1270 out_unlock:
1271         spin_unlock_irqrestore(&priv->lock, flags);
1272         ipoib_mcast_remove_list(&remove_list);
1273 }
1274
1275 static void ipoib_reap_neigh(struct work_struct *work)
1276 {
1277         struct ipoib_dev_priv *priv =
1278                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1279
1280         __ipoib_reap_neigh(priv);
1281
1282         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1283                 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1284                                    arp_tbl.gc_interval);
1285 }
1286
1287
1288 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1289                                       struct net_device *dev)
1290 {
1291         struct ipoib_neigh *neigh;
1292
1293         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1294         if (!neigh)
1295                 return NULL;
1296
1297         neigh->dev = dev;
1298         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1299         skb_queue_head_init(&neigh->queue);
1300         INIT_LIST_HEAD(&neigh->list);
1301         ipoib_cm_set(neigh, NULL);
1302         /* one ref on behalf of the caller */
1303         atomic_set(&neigh->refcnt, 1);
1304
1305         return neigh;
1306 }
1307
1308 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1309                                       struct net_device *dev)
1310 {
1311         struct ipoib_dev_priv *priv = netdev_priv(dev);
1312         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1313         struct ipoib_neigh_hash *htbl;
1314         struct ipoib_neigh *neigh;
1315         u32 hash_val;
1316
1317         htbl = rcu_dereference_protected(ntbl->htbl,
1318                                          lockdep_is_held(&priv->lock));
1319         if (!htbl) {
1320                 neigh = NULL;
1321                 goto out_unlock;
1322         }
1323
1324         /* need to add a new neigh, but maybe some other thread succeeded?
1325          * recalc hash, maybe hash resize took place so we do a search
1326          */
1327         hash_val = ipoib_addr_hash(htbl, daddr);
1328         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1329                                                lockdep_is_held(&priv->lock));
1330              neigh != NULL;
1331              neigh = rcu_dereference_protected(neigh->hnext,
1332                                                lockdep_is_held(&priv->lock))) {
1333                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1334                         /* found, take one ref on behalf of the caller */
1335                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1336                                 /* deleted */
1337                                 neigh = NULL;
1338                                 break;
1339                         }
1340                         neigh->alive = jiffies;
1341                         goto out_unlock;
1342                 }
1343         }
1344
1345         neigh = ipoib_neigh_ctor(daddr, dev);
1346         if (!neigh)
1347                 goto out_unlock;
1348
1349         /* one ref on behalf of the hash table */
1350         atomic_inc(&neigh->refcnt);
1351         neigh->alive = jiffies;
1352         /* put in hash */
1353         rcu_assign_pointer(neigh->hnext,
1354                            rcu_dereference_protected(htbl->buckets[hash_val],
1355                                                      lockdep_is_held(&priv->lock)));
1356         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1357         atomic_inc(&ntbl->entries);
1358
1359 out_unlock:
1360
1361         return neigh;
1362 }
1363
1364 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1365 {
1366         /* neigh reference count was dropprd to zero */
1367         struct net_device *dev = neigh->dev;
1368         struct ipoib_dev_priv *priv = netdev_priv(dev);
1369         struct sk_buff *skb;
1370         if (neigh->ah)
1371                 ipoib_put_ah(neigh->ah);
1372         while ((skb = __skb_dequeue(&neigh->queue))) {
1373                 ++dev->stats.tx_dropped;
1374                 dev_kfree_skb_any(skb);
1375         }
1376         if (ipoib_cm_get(neigh))
1377                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1378         ipoib_dbg(netdev_priv(dev),
1379                   "neigh free for %06x %pI6\n",
1380                   IPOIB_QPN(neigh->daddr),
1381                   neigh->daddr + 4);
1382         kfree(neigh);
1383         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1384                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1385                         complete(&priv->ntbl.flushed);
1386         }
1387 }
1388
1389 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1390 {
1391         /* Called as a result of removal from hash table */
1392         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1393         /* note TX context may hold another ref */
1394         ipoib_neigh_put(neigh);
1395 }
1396
1397 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1398 {
1399         struct net_device *dev = neigh->dev;
1400         struct ipoib_dev_priv *priv = netdev_priv(dev);
1401         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1402         struct ipoib_neigh_hash *htbl;
1403         struct ipoib_neigh __rcu **np;
1404         struct ipoib_neigh *n;
1405         u32 hash_val;
1406
1407         htbl = rcu_dereference_protected(ntbl->htbl,
1408                                         lockdep_is_held(&priv->lock));
1409         if (!htbl)
1410                 return;
1411
1412         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1413         np = &htbl->buckets[hash_val];
1414         for (n = rcu_dereference_protected(*np,
1415                                             lockdep_is_held(&priv->lock));
1416              n != NULL;
1417              n = rcu_dereference_protected(*np,
1418                                         lockdep_is_held(&priv->lock))) {
1419                 if (n == neigh) {
1420                         /* found */
1421                         rcu_assign_pointer(*np,
1422                                            rcu_dereference_protected(neigh->hnext,
1423                                                                      lockdep_is_held(&priv->lock)));
1424                         /* remove from parent list */
1425                         list_del(&neigh->list);
1426                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1427                         return;
1428                 } else {
1429                         np = &n->hnext;
1430                 }
1431         }
1432 }
1433
1434 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1435 {
1436         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1437         struct ipoib_neigh_hash *htbl;
1438         struct ipoib_neigh __rcu **buckets;
1439         u32 size;
1440
1441         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1442         ntbl->htbl = NULL;
1443         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1444         if (!htbl)
1445                 return -ENOMEM;
1446         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1447         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1448         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1449         if (!buckets) {
1450                 kfree(htbl);
1451                 return -ENOMEM;
1452         }
1453         htbl->size = size;
1454         htbl->mask = (size - 1);
1455         htbl->buckets = buckets;
1456         RCU_INIT_POINTER(ntbl->htbl, htbl);
1457         htbl->ntbl = ntbl;
1458         atomic_set(&ntbl->entries, 0);
1459
1460         /* start garbage collection */
1461         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1462         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1463                            arp_tbl.gc_interval);
1464
1465         return 0;
1466 }
1467
1468 static void neigh_hash_free_rcu(struct rcu_head *head)
1469 {
1470         struct ipoib_neigh_hash *htbl = container_of(head,
1471                                                     struct ipoib_neigh_hash,
1472                                                     rcu);
1473         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1474         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1475
1476         kfree(buckets);
1477         kfree(htbl);
1478         complete(&ntbl->deleted);
1479 }
1480
1481 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1482 {
1483         struct ipoib_dev_priv *priv = netdev_priv(dev);
1484         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1485         struct ipoib_neigh_hash *htbl;
1486         unsigned long flags;
1487         int i;
1488
1489         /* remove all neigh connected to a given path or mcast */
1490         spin_lock_irqsave(&priv->lock, flags);
1491
1492         htbl = rcu_dereference_protected(ntbl->htbl,
1493                                          lockdep_is_held(&priv->lock));
1494
1495         if (!htbl)
1496                 goto out_unlock;
1497
1498         for (i = 0; i < htbl->size; i++) {
1499                 struct ipoib_neigh *neigh;
1500                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1501
1502                 while ((neigh = rcu_dereference_protected(*np,
1503                                                           lockdep_is_held(&priv->lock))) != NULL) {
1504                         /* delete neighs belong to this parent */
1505                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1506                                 rcu_assign_pointer(*np,
1507                                                    rcu_dereference_protected(neigh->hnext,
1508                                                                              lockdep_is_held(&priv->lock)));
1509                                 /* remove from parent list */
1510                                 list_del(&neigh->list);
1511                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1512                         } else {
1513                                 np = &neigh->hnext;
1514                         }
1515
1516                 }
1517         }
1518 out_unlock:
1519         spin_unlock_irqrestore(&priv->lock, flags);
1520 }
1521
1522 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1523 {
1524         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1525         struct ipoib_neigh_hash *htbl;
1526         unsigned long flags;
1527         int i, wait_flushed = 0;
1528
1529         init_completion(&priv->ntbl.flushed);
1530
1531         spin_lock_irqsave(&priv->lock, flags);
1532
1533         htbl = rcu_dereference_protected(ntbl->htbl,
1534                                         lockdep_is_held(&priv->lock));
1535         if (!htbl)
1536                 goto out_unlock;
1537
1538         wait_flushed = atomic_read(&priv->ntbl.entries);
1539         if (!wait_flushed)
1540                 goto free_htbl;
1541
1542         for (i = 0; i < htbl->size; i++) {
1543                 struct ipoib_neigh *neigh;
1544                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1545
1546                 while ((neigh = rcu_dereference_protected(*np,
1547                                        lockdep_is_held(&priv->lock))) != NULL) {
1548                         rcu_assign_pointer(*np,
1549                                            rcu_dereference_protected(neigh->hnext,
1550                                                                      lockdep_is_held(&priv->lock)));
1551                         /* remove from path/mc list */
1552                         list_del(&neigh->list);
1553                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1554                 }
1555         }
1556
1557 free_htbl:
1558         rcu_assign_pointer(ntbl->htbl, NULL);
1559         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1560
1561 out_unlock:
1562         spin_unlock_irqrestore(&priv->lock, flags);
1563         if (wait_flushed)
1564                 wait_for_completion(&priv->ntbl.flushed);
1565 }
1566
1567 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1568 {
1569         struct ipoib_dev_priv *priv = netdev_priv(dev);
1570         int stopped;
1571
1572         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1573         init_completion(&priv->ntbl.deleted);
1574         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1575
1576         /* Stop GC if called at init fail need to cancel work */
1577         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1578         if (!stopped)
1579                 cancel_delayed_work(&priv->neigh_reap_task);
1580
1581         ipoib_flush_neighs(priv);
1582
1583         wait_for_completion(&priv->ntbl.deleted);
1584 }
1585
1586
1587 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1588 {
1589         struct ipoib_dev_priv *priv = netdev_priv(dev);
1590
1591         /* Allocate RX/TX "rings" to hold queued skbs */
1592         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1593                                 GFP_KERNEL);
1594         if (!priv->rx_ring) {
1595                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1596                        ca->name, ipoib_recvq_size);
1597                 goto out;
1598         }
1599
1600         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1601         if (!priv->tx_ring) {
1602                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1603                        ca->name, ipoib_sendq_size);
1604                 goto out_rx_ring_cleanup;
1605         }
1606
1607         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1608
1609         if (ipoib_ib_dev_init(dev, ca, port))
1610                 goto out_tx_ring_cleanup;
1611
1612         /*
1613          * Must be after ipoib_ib_dev_init so we can allocate a per
1614          * device wq there and use it here
1615          */
1616         if (ipoib_neigh_hash_init(priv) < 0)
1617                 goto out_dev_uninit;
1618
1619         return 0;
1620
1621 out_dev_uninit:
1622         ipoib_ib_dev_cleanup(dev);
1623
1624 out_tx_ring_cleanup:
1625         vfree(priv->tx_ring);
1626
1627 out_rx_ring_cleanup:
1628         kfree(priv->rx_ring);
1629
1630 out:
1631         return -ENOMEM;
1632 }
1633
1634 void ipoib_dev_cleanup(struct net_device *dev)
1635 {
1636         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1637         LIST_HEAD(head);
1638
1639         ASSERT_RTNL();
1640
1641         ipoib_delete_debug_files(dev);
1642
1643         /* Delete any child interfaces first */
1644         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1645                 /* Stop GC on child */
1646                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1647                 cancel_delayed_work(&cpriv->neigh_reap_task);
1648                 unregister_netdevice_queue(cpriv->dev, &head);
1649         }
1650         unregister_netdevice_many(&head);
1651
1652         /*
1653          * Must be before ipoib_ib_dev_cleanup or we delete an in use
1654          * work queue
1655          */
1656         ipoib_neigh_hash_uninit(dev);
1657
1658         ipoib_ib_dev_cleanup(dev);
1659
1660         kfree(priv->rx_ring);
1661         vfree(priv->tx_ring);
1662
1663         priv->rx_ring = NULL;
1664         priv->tx_ring = NULL;
1665 }
1666
1667 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1668 {
1669         struct ipoib_dev_priv *priv = netdev_priv(dev);
1670
1671         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1672 }
1673
1674 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1675                                struct ifla_vf_info *ivf)
1676 {
1677         struct ipoib_dev_priv *priv = netdev_priv(dev);
1678         int err;
1679
1680         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
1681         if (err)
1682                 return err;
1683
1684         ivf->vf = vf;
1685
1686         return 0;
1687 }
1688
1689 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
1690 {
1691         struct ipoib_dev_priv *priv = netdev_priv(dev);
1692
1693         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
1694                 return -EINVAL;
1695
1696         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
1697 }
1698
1699 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
1700                               struct ifla_vf_stats *vf_stats)
1701 {
1702         struct ipoib_dev_priv *priv = netdev_priv(dev);
1703
1704         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
1705 }
1706
1707 static const struct header_ops ipoib_header_ops = {
1708         .create = ipoib_hard_header,
1709 };
1710
1711 static const struct net_device_ops ipoib_netdev_ops_pf = {
1712         .ndo_uninit              = ipoib_uninit,
1713         .ndo_open                = ipoib_open,
1714         .ndo_stop                = ipoib_stop,
1715         .ndo_change_mtu          = ipoib_change_mtu,
1716         .ndo_fix_features        = ipoib_fix_features,
1717         .ndo_start_xmit          = ipoib_start_xmit,
1718         .ndo_tx_timeout          = ipoib_timeout,
1719         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1720         .ndo_get_iflink          = ipoib_get_iflink,
1721         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
1722         .ndo_get_vf_config       = ipoib_get_vf_config,
1723         .ndo_get_vf_stats        = ipoib_get_vf_stats,
1724         .ndo_set_vf_guid         = ipoib_set_vf_guid,
1725 };
1726
1727 static const struct net_device_ops ipoib_netdev_ops_vf = {
1728         .ndo_uninit              = ipoib_uninit,
1729         .ndo_open                = ipoib_open,
1730         .ndo_stop                = ipoib_stop,
1731         .ndo_change_mtu          = ipoib_change_mtu,
1732         .ndo_fix_features        = ipoib_fix_features,
1733         .ndo_start_xmit          = ipoib_start_xmit,
1734         .ndo_tx_timeout          = ipoib_timeout,
1735         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1736         .ndo_get_iflink          = ipoib_get_iflink,
1737 };
1738
1739 void ipoib_setup(struct net_device *dev)
1740 {
1741         struct ipoib_dev_priv *priv = netdev_priv(dev);
1742
1743         if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
1744                 dev->netdev_ops = &ipoib_netdev_ops_vf;
1745         else
1746                 dev->netdev_ops = &ipoib_netdev_ops_pf;
1747
1748         dev->header_ops          = &ipoib_header_ops;
1749
1750         ipoib_set_ethtool_ops(dev);
1751
1752         netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1753
1754         dev->watchdog_timeo      = HZ;
1755
1756         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1757
1758         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1759         dev->addr_len            = INFINIBAND_ALEN;
1760         dev->type                = ARPHRD_INFINIBAND;
1761         dev->tx_queue_len        = ipoib_sendq_size * 2;
1762         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1763                                     NETIF_F_HIGHDMA);
1764         netif_keep_dst(dev);
1765
1766         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1767
1768         priv->dev = dev;
1769
1770         spin_lock_init(&priv->lock);
1771
1772         init_rwsem(&priv->vlan_rwsem);
1773
1774         INIT_LIST_HEAD(&priv->path_list);
1775         INIT_LIST_HEAD(&priv->child_intfs);
1776         INIT_LIST_HEAD(&priv->dead_ahs);
1777         INIT_LIST_HEAD(&priv->multicast_list);
1778
1779         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1780         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1781         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1782         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1783         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1784         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1785         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1786         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1787 }
1788
1789 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1790 {
1791         struct net_device *dev;
1792
1793         dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1794                            NET_NAME_UNKNOWN, ipoib_setup);
1795         if (!dev)
1796                 return NULL;
1797
1798         return netdev_priv(dev);
1799 }
1800
1801 static ssize_t show_pkey(struct device *dev,
1802                          struct device_attribute *attr, char *buf)
1803 {
1804         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1805
1806         return sprintf(buf, "0x%04x\n", priv->pkey);
1807 }
1808 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1809
1810 static ssize_t show_umcast(struct device *dev,
1811                            struct device_attribute *attr, char *buf)
1812 {
1813         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1814
1815         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1816 }
1817
1818 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1819 {
1820         struct ipoib_dev_priv *priv = netdev_priv(ndev);
1821
1822         if (umcast_val > 0) {
1823                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1824                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1825                                 "by userspace\n");
1826         } else
1827                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1828 }
1829
1830 static ssize_t set_umcast(struct device *dev,
1831                           struct device_attribute *attr,
1832                           const char *buf, size_t count)
1833 {
1834         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1835
1836         ipoib_set_umcast(to_net_dev(dev), umcast_val);
1837
1838         return count;
1839 }
1840 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1841
1842 int ipoib_add_umcast_attr(struct net_device *dev)
1843 {
1844         return device_create_file(&dev->dev, &dev_attr_umcast);
1845 }
1846
1847 static ssize_t create_child(struct device *dev,
1848                             struct device_attribute *attr,
1849                             const char *buf, size_t count)
1850 {
1851         int pkey;
1852         int ret;
1853
1854         if (sscanf(buf, "%i", &pkey) != 1)
1855                 return -EINVAL;
1856
1857         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1858                 return -EINVAL;
1859
1860         /*
1861          * Set the full membership bit, so that we join the right
1862          * broadcast group, etc.
1863          */
1864         pkey |= 0x8000;
1865
1866         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1867
1868         return ret ? ret : count;
1869 }
1870 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1871
1872 static ssize_t delete_child(struct device *dev,
1873                             struct device_attribute *attr,
1874                             const char *buf, size_t count)
1875 {
1876         int pkey;
1877         int ret;
1878
1879         if (sscanf(buf, "%i", &pkey) != 1)
1880                 return -EINVAL;
1881
1882         if (pkey < 0 || pkey > 0xffff)
1883                 return -EINVAL;
1884
1885         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1886
1887         return ret ? ret : count;
1888
1889 }
1890 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1891
1892 int ipoib_add_pkey_attr(struct net_device *dev)
1893 {
1894         return device_create_file(&dev->dev, &dev_attr_pkey);
1895 }
1896
1897 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1898 {
1899         priv->hca_caps = hca->attrs.device_cap_flags;
1900
1901         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1902                 priv->dev->hw_features = NETIF_F_SG |
1903                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1904
1905                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1906                         priv->dev->hw_features |= NETIF_F_TSO;
1907
1908                 priv->dev->features |= priv->dev->hw_features;
1909         }
1910
1911         return 0;
1912 }
1913
1914 static struct net_device *ipoib_add_port(const char *format,
1915                                          struct ib_device *hca, u8 port)
1916 {
1917         struct ipoib_dev_priv *priv;
1918         struct ib_port_attr attr;
1919         int result = -ENOMEM;
1920
1921         priv = ipoib_intf_alloc(format);
1922         if (!priv)
1923                 goto alloc_mem_failed;
1924
1925         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1926         priv->dev->dev_id = port - 1;
1927
1928         result = ib_query_port(hca, port, &attr);
1929         if (!result)
1930                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1931         else {
1932                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1933                        hca->name, port);
1934                 goto device_init_failed;
1935         }
1936
1937         /* MTU will be reset when mcast join happens */
1938         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1939         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1940
1941         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1942
1943         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1944         if (result) {
1945                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1946                        hca->name, port, result);
1947                 goto device_init_failed;
1948         }
1949
1950         result = ipoib_set_dev_features(priv, hca);
1951         if (result)
1952                 goto device_init_failed;
1953
1954         /*
1955          * Set the full membership bit, so that we join the right
1956          * broadcast group, etc.
1957          */
1958         priv->pkey |= 0x8000;
1959
1960         priv->dev->broadcast[8] = priv->pkey >> 8;
1961         priv->dev->broadcast[9] = priv->pkey & 0xff;
1962
1963         result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
1964         if (result) {
1965                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1966                        hca->name, port, result);
1967                 goto device_init_failed;
1968         } else
1969                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1970
1971         result = ipoib_dev_init(priv->dev, hca, port);
1972         if (result < 0) {
1973                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1974                        hca->name, port, result);
1975                 goto device_init_failed;
1976         }
1977
1978         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1979                               priv->ca, ipoib_event);
1980         result = ib_register_event_handler(&priv->event_handler);
1981         if (result < 0) {
1982                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1983                        "port %d (ret = %d)\n",
1984                        hca->name, port, result);
1985                 goto event_failed;
1986         }
1987
1988         result = register_netdev(priv->dev);
1989         if (result) {
1990                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1991                        hca->name, port, result);
1992                 goto register_failed;
1993         }
1994
1995         ipoib_create_debug_files(priv->dev);
1996
1997         if (ipoib_cm_add_mode_attr(priv->dev))
1998                 goto sysfs_failed;
1999         if (ipoib_add_pkey_attr(priv->dev))
2000                 goto sysfs_failed;
2001         if (ipoib_add_umcast_attr(priv->dev))
2002                 goto sysfs_failed;
2003         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
2004                 goto sysfs_failed;
2005         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
2006                 goto sysfs_failed;
2007
2008         return priv->dev;
2009
2010 sysfs_failed:
2011         ipoib_delete_debug_files(priv->dev);
2012         unregister_netdev(priv->dev);
2013
2014 register_failed:
2015         ib_unregister_event_handler(&priv->event_handler);
2016         flush_workqueue(ipoib_workqueue);
2017         /* Stop GC if started before flush */
2018         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2019         cancel_delayed_work(&priv->neigh_reap_task);
2020         flush_workqueue(priv->wq);
2021
2022 event_failed:
2023         ipoib_dev_cleanup(priv->dev);
2024
2025 device_init_failed:
2026         free_netdev(priv->dev);
2027
2028 alloc_mem_failed:
2029         return ERR_PTR(result);
2030 }
2031
2032 static void ipoib_add_one(struct ib_device *device)
2033 {
2034         struct list_head *dev_list;
2035         struct net_device *dev;
2036         struct ipoib_dev_priv *priv;
2037         int p;
2038         int count = 0;
2039
2040         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
2041         if (!dev_list)
2042                 return;
2043
2044         INIT_LIST_HEAD(dev_list);
2045
2046         for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
2047                 if (!rdma_protocol_ib(device, p))
2048                         continue;
2049                 dev = ipoib_add_port("ib%d", device, p);
2050                 if (!IS_ERR(dev)) {
2051                         priv = netdev_priv(dev);
2052                         list_add_tail(&priv->list, dev_list);
2053                         count++;
2054                 }
2055         }
2056
2057         if (!count) {
2058                 kfree(dev_list);
2059                 return;
2060         }
2061
2062         ib_set_client_data(device, &ipoib_client, dev_list);
2063 }
2064
2065 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2066 {
2067         struct ipoib_dev_priv *priv, *tmp;
2068         struct list_head *dev_list = client_data;
2069
2070         if (!dev_list)
2071                 return;
2072
2073         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2074                 ib_unregister_event_handler(&priv->event_handler);
2075                 flush_workqueue(ipoib_workqueue);
2076
2077                 rtnl_lock();
2078                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
2079                 rtnl_unlock();
2080
2081                 /* Stop GC */
2082                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2083                 cancel_delayed_work(&priv->neigh_reap_task);
2084                 flush_workqueue(priv->wq);
2085
2086                 unregister_netdev(priv->dev);
2087                 free_netdev(priv->dev);
2088         }
2089
2090         kfree(dev_list);
2091 }
2092
2093 static int __init ipoib_init_module(void)
2094 {
2095         int ret;
2096
2097         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2098         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2099         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2100
2101         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2102         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2103         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2104 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2105         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2106 #endif
2107
2108         /*
2109          * When copying small received packets, we only copy from the
2110          * linear data part of the SKB, so we rely on this condition.
2111          */
2112         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2113
2114         ret = ipoib_register_debugfs();
2115         if (ret)
2116                 return ret;
2117
2118         /*
2119          * We create a global workqueue here that is used for all flush
2120          * operations.  However, if you attempt to flush a workqueue
2121          * from a task on that same workqueue, it deadlocks the system.
2122          * We want to be able to flush the tasks associated with a
2123          * specific net device, so we also create a workqueue for each
2124          * netdevice.  We queue up the tasks for that device only on
2125          * its private workqueue, and we only queue up flush events
2126          * on our global flush workqueue.  This avoids the deadlocks.
2127          */
2128         ipoib_workqueue = create_singlethread_workqueue("ipoib_flush");
2129         if (!ipoib_workqueue) {
2130                 ret = -ENOMEM;
2131                 goto err_fs;
2132         }
2133
2134         ib_sa_register_client(&ipoib_sa_client);
2135
2136         ret = ib_register_client(&ipoib_client);
2137         if (ret)
2138                 goto err_sa;
2139
2140         ret = ipoib_netlink_init();
2141         if (ret)
2142                 goto err_client;
2143
2144         return 0;
2145
2146 err_client:
2147         ib_unregister_client(&ipoib_client);
2148
2149 err_sa:
2150         ib_sa_unregister_client(&ipoib_sa_client);
2151         destroy_workqueue(ipoib_workqueue);
2152
2153 err_fs:
2154         ipoib_unregister_debugfs();
2155
2156         return ret;
2157 }
2158
2159 static void __exit ipoib_cleanup_module(void)
2160 {
2161         ipoib_netlink_fini();
2162         ib_unregister_client(&ipoib_client);
2163         ib_sa_unregister_client(&ipoib_sa_client);
2164         ipoib_unregister_debugfs();
2165         destroy_workqueue(ipoib_workqueue);
2166 }
2167
2168 module_init(ipoib_init_module);
2169 module_exit(ipoib_cleanup_module);