git.oblomov.eu Git - linux-2.6/blob - 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  * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
  35  */
  36
  37 #include "ipoib.h"
  38
  39 #include <linux/module.h>
  40
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/kernel.h>
  44
  45 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  46
  47 #include <linux/ip.h>
  48 #include <linux/in.h>
  49
  50 #include <net/dst.h>
  51
  52 MODULE_AUTHOR("Roland Dreier");
  53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  58
  59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  63
  64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  65 int ipoib_debug_level;
  66
  67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  69 #endif
  70
  71 struct ipoib_path_iter {
  72         struct net_device *dev;
  73         struct ipoib_path  path;
  74 };
  75
  76 static const u8 ipv4_bcast_addr[] = {
  77         0x00, 0xff, 0xff, 0xff,
  78         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  79         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  80 };
  81
  82 struct workqueue_struct *ipoib_workqueue;
  83
  84 struct ib_sa_client ipoib_sa_client;
  85
  86 static void ipoib_add_one(struct ib_device *device);
  87 static void ipoib_remove_one(struct ib_device *device);
  88
  89 static struct ib_client ipoib_client = {
  90         .name   = "ipoib",
  91         .add    = ipoib_add_one,
  92         .remove = ipoib_remove_one
  93 };
  94
  95 int ipoib_open(struct net_device *dev)
  96 {
  97         struct ipoib_dev_priv *priv = netdev_priv(dev);
  98
  99         ipoib_dbg(priv, "bringing up interface\n");
 100
 101         napi_enable(&priv->napi);
 102         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 103
 104         if (ipoib_pkey_dev_delay_open(dev))
 105                 return 0;
 106
 107         if (ipoib_ib_dev_open(dev)) {
 108                 napi_disable(&priv->napi);
 109                 return -EINVAL;
 110         }
 111
 112         if (ipoib_ib_dev_up(dev)) {
 113                 ipoib_ib_dev_stop(dev, 1);
 114                 napi_disable(&priv->napi);
 115                 return -EINVAL;
 116         }
 117
 118         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 119                 struct ipoib_dev_priv *cpriv;
 120
 121                 /* Bring up any child interfaces too */
 122                 mutex_lock(&priv->vlan_mutex);
 123                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 124                         int flags;
 125
 126                         flags = cpriv->dev->flags;
 127                         if (flags & IFF_UP)
 128                                 continue;
 129
 130                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 131                 }
 132                 mutex_unlock(&priv->vlan_mutex);
 133         }
 134
 135         netif_start_queue(dev);
 136
 137         return 0;
 138 }
 139
 140 static int ipoib_stop(struct net_device *dev)
 141 {
 142         struct ipoib_dev_priv *priv = netdev_priv(dev);
 143
 144         ipoib_dbg(priv, "stopping interface\n");
 145
 146         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 147         napi_disable(&priv->napi);
 148
 149         netif_stop_queue(dev);
 150
 151         clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
 152
 153         /*
 154          * Now flush workqueue to make sure a scheduled task doesn't
 155          * bring our internal state back up.
 156          */
 157         flush_workqueue(ipoib_workqueue);
 158
 159         ipoib_ib_dev_down(dev, 1);
 160         ipoib_ib_dev_stop(dev, 1);
 161
 162         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 163                 struct ipoib_dev_priv *cpriv;
 164
 165                 /* Bring down any child interfaces too */
 166                 mutex_lock(&priv->vlan_mutex);
 167                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 168                         int flags;
 169
 170                         flags = cpriv->dev->flags;
 171                         if (!(flags & IFF_UP))
 172                                 continue;
 173
 174                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 175                 }
 176                 mutex_unlock(&priv->vlan_mutex);
 177         }
 178
 179         return 0;
 180 }
 181
 182 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 183 {
 184         struct ipoib_dev_priv *priv = netdev_priv(dev);
 185
 186         /* dev->mtu > 2K ==> connected mode */
 187         if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
 188                 if (new_mtu > priv->mcast_mtu)
 189                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 190                                    priv->mcast_mtu);
 191                 dev->mtu = new_mtu;
 192                 return 0;
 193         }
 194
 195         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN) {
 196                 return -EINVAL;
 197         }
 198
 199         priv->admin_mtu = new_mtu;
 200
 201         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 202
 203         return 0;
 204 }
 205
 206 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 207 {
 208         struct ipoib_dev_priv *priv = netdev_priv(dev);
 209         struct rb_node *n = priv->path_tree.rb_node;
 210         struct ipoib_path *path;
 211         int ret;
 212
 213         while (n) {
 214                 path = rb_entry(n, struct ipoib_path, rb_node);
 215
 216                 ret = memcmp(gid, path->pathrec.dgid.raw,
 217                              sizeof (union ib_gid));
 218
 219                 if (ret < 0)
 220                         n = n->rb_left;
 221                 else if (ret > 0)
 222                         n = n->rb_right;
 223                 else
 224                         return path;
 225         }
 226
 227         return NULL;
 228 }
 229
 230 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 231 {
 232         struct ipoib_dev_priv *priv = netdev_priv(dev);
 233         struct rb_node **n = &priv->path_tree.rb_node;
 234         struct rb_node *pn = NULL;
 235         struct ipoib_path *tpath;
 236         int ret;
 237
 238         while (*n) {
 239                 pn = *n;
 240                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 241
 242                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 243                              sizeof (union ib_gid));
 244                 if (ret < 0)
 245                         n = &pn->rb_left;
 246                 else if (ret > 0)
 247                         n = &pn->rb_right;
 248                 else
 249                         return -EEXIST;
 250         }
 251
 252         rb_link_node(&path->rb_node, pn, n);
 253         rb_insert_color(&path->rb_node, &priv->path_tree);
 254
 255         list_add_tail(&path->list, &priv->path_list);
 256
 257         return 0;
 258 }
 259
 260 static void path_free(struct net_device *dev, struct ipoib_path *path)
 261 {
 262         struct ipoib_dev_priv *priv = netdev_priv(dev);
 263         struct ipoib_neigh *neigh, *tn;
 264         struct sk_buff *skb;
 265         unsigned long flags;
 266
 267         while ((skb = __skb_dequeue(&path->queue)))
 268                 dev_kfree_skb_irq(skb);
 269
 270         spin_lock_irqsave(&priv->lock, flags);
 271
 272         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 273                 /*
 274                  * It's safe to call ipoib_put_ah() inside priv->lock
 275                  * here, because we know that path->ah will always
 276                  * hold one more reference, so ipoib_put_ah() will
 277                  * never do more than decrement the ref count.
 278                  */
 279                 if (neigh->ah)
 280                         ipoib_put_ah(neigh->ah);
 281
 282                 ipoib_neigh_free(dev, neigh);
 283         }
 284
 285         spin_unlock_irqrestore(&priv->lock, flags);
 286
 287         if (path->ah)
 288                 ipoib_put_ah(path->ah);
 289
 290         kfree(path);
 291 }
 292
 293 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 294
 295 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 296 {
 297         struct ipoib_path_iter *iter;
 298
 299         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 300         if (!iter)
 301                 return NULL;
 302
 303         iter->dev = dev;
 304         memset(iter->path.pathrec.dgid.raw, 0, 16);
 305
 306         if (ipoib_path_iter_next(iter)) {
 307                 kfree(iter);
 308                 return NULL;
 309         }
 310
 311         return iter;
 312 }
 313
 314 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 315 {
 316         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 317         struct rb_node *n;
 318         struct ipoib_path *path;
 319         int ret = 1;
 320
 321         spin_lock_irq(&priv->lock);
 322
 323         n = rb_first(&priv->path_tree);
 324
 325         while (n) {
 326                 path = rb_entry(n, struct ipoib_path, rb_node);
 327
 328                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 329                            sizeof (union ib_gid)) < 0) {
 330                         iter->path = *path;
 331                         ret = 0;
 332                         break;
 333                 }
 334
 335                 n = rb_next(n);
 336         }
 337
 338         spin_unlock_irq(&priv->lock);
 339
 340         return ret;
 341 }
 342
 343 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 344                           struct ipoib_path *path)
 345 {
 346         *path = iter->path;
 347 }
 348
 349 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 350
 351 void ipoib_flush_paths(struct net_device *dev)
 352 {
 353         struct ipoib_dev_priv *priv = netdev_priv(dev);
 354         struct ipoib_path *path, *tp;
 355         LIST_HEAD(remove_list);
 356
 357         spin_lock_irq(&priv->tx_lock);
 358         spin_lock(&priv->lock);
 359
 360         list_splice(&priv->path_list, &remove_list);
 361         INIT_LIST_HEAD(&priv->path_list);
 362
 363         list_for_each_entry(path, &remove_list, list)
 364                 rb_erase(&path->rb_node, &priv->path_tree);
 365
 366         list_for_each_entry_safe(path, tp, &remove_list, list) {
 367                 if (path->query)
 368                         ib_sa_cancel_query(path->query_id, path->query);
 369                 spin_unlock(&priv->lock);
 370                 spin_unlock_irq(&priv->tx_lock);
 371                 wait_for_completion(&path->done);
 372                 path_free(dev, path);
 373                 spin_lock_irq(&priv->tx_lock);
 374                 spin_lock(&priv->lock);
 375         }
 376         spin_unlock(&priv->lock);
 377         spin_unlock_irq(&priv->tx_lock);
 378 }
 379
 380 static void path_rec_completion(int status,
 381                                 struct ib_sa_path_rec *pathrec,
 382                                 void *path_ptr)
 383 {
 384         struct ipoib_path *path = path_ptr;
 385         struct net_device *dev = path->dev;
 386         struct ipoib_dev_priv *priv = netdev_priv(dev);
 387         struct ipoib_ah *ah = NULL;
 388         struct ipoib_neigh *neigh, *tn;
 389         struct sk_buff_head skqueue;
 390         struct sk_buff *skb;
 391         unsigned long flags;
 392
 393         if (!status)
 394                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 395                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 396         else
 397                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 398                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 399
 400         skb_queue_head_init(&skqueue);
 401
 402         if (!status) {
 403                 struct ib_ah_attr av;
 404
 405                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 406                         ah = ipoib_create_ah(dev, priv->pd, &av);
 407         }
 408
 409         spin_lock_irqsave(&priv->lock, flags);
 410
 411         path->ah = ah;
 412
 413         if (ah) {
 414                 path->pathrec = *pathrec;
 415
 416                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 417                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 418
 419                 while ((skb = __skb_dequeue(&path->queue)))
 420                         __skb_queue_tail(&skqueue, skb);
 421
 422                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 423                         kref_get(&path->ah->ref);
 424                         neigh->ah = path->ah;
 425                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 426                                sizeof(union ib_gid));
 427
 428                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 429                                 if (!ipoib_cm_get(neigh))
 430                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 431                                                                                path,
 432                                                                                neigh));
 433                                 if (!ipoib_cm_get(neigh)) {
 434                                         list_del(&neigh->list);
 435                                         if (neigh->ah)
 436                                                 ipoib_put_ah(neigh->ah);
 437                                         ipoib_neigh_free(dev, neigh);
 438                                         continue;
 439                                 }
 440                         }
 441
 442                         while ((skb = __skb_dequeue(&neigh->queue)))
 443                                 __skb_queue_tail(&skqueue, skb);
 444                 }
 445         }
 446
 447         path->query = NULL;
 448         complete(&path->done);
 449
 450         spin_unlock_irqrestore(&priv->lock, flags);
 451
 452         while ((skb = __skb_dequeue(&skqueue))) {
 453                 skb->dev = dev;
 454                 if (dev_queue_xmit(skb))
 455                         ipoib_warn(priv, "dev_queue_xmit failed "
 456                                    "to requeue packet\n");
 457         }
 458 }
 459
 460 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 461 {
 462         struct ipoib_dev_priv *priv = netdev_priv(dev);
 463         struct ipoib_path *path;
 464
 465         path = kzalloc(sizeof *path, GFP_ATOMIC);
 466         if (!path)
 467                 return NULL;
 468
 469         path->dev = dev;
 470
 471         skb_queue_head_init(&path->queue);
 472
 473         INIT_LIST_HEAD(&path->neigh_list);
 474
 475         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 476         path->pathrec.sgid          = priv->local_gid;
 477         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 478         path->pathrec.numb_path     = 1;
 479         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 480
 481         return path;
 482 }
 483
 484 static int path_rec_start(struct net_device *dev,
 485                           struct ipoib_path *path)
 486 {
 487         struct ipoib_dev_priv *priv = netdev_priv(dev);
 488
 489         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 490                   IPOIB_GID_ARG(path->pathrec.dgid));
 491
 492         init_completion(&path->done);
 493
 494         path->query_id =
 495                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 496                                    &path->pathrec,
 497                                    IB_SA_PATH_REC_DGID          |
 498                                    IB_SA_PATH_REC_SGID          |
 499                                    IB_SA_PATH_REC_NUMB_PATH     |
 500                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 501                                    IB_SA_PATH_REC_PKEY,
 502                                    1000, GFP_ATOMIC,
 503                                    path_rec_completion,
 504                                    path, &path->query);
 505         if (path->query_id < 0) {
 506                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 507                 path->query = NULL;
 508                 return path->query_id;
 509         }
 510
 511         return 0;
 512 }
 513
 514 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 515 {
 516         struct ipoib_dev_priv *priv = netdev_priv(dev);
 517         struct ipoib_path *path;
 518         struct ipoib_neigh *neigh;
 519
 520         neigh = ipoib_neigh_alloc(skb->dst->neighbour);
 521         if (!neigh) {
 522                 ++dev->stats.tx_dropped;
 523                 dev_kfree_skb_any(skb);
 524                 return;
 525         }
 526
 527         /*
 528          * We can only be called from ipoib_start_xmit, so we're
 529          * inside tx_lock -- no need to save/restore flags.
 530          */
 531         spin_lock(&priv->lock);
 532
 533         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 534         if (!path) {
 535                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 536                 if (!path)
 537                         goto err_path;
 538
 539                 __path_add(dev, path);
 540         }
 541
 542         list_add_tail(&neigh->list, &path->neigh_list);
 543
 544         if (path->ah) {
 545                 kref_get(&path->ah->ref);
 546                 neigh->ah = path->ah;
 547                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 548                        sizeof(union ib_gid));
 549
 550                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 551                         if (!ipoib_cm_get(neigh))
 552                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 553                         if (!ipoib_cm_get(neigh)) {
 554                                 list_del(&neigh->list);
 555                                 if (neigh->ah)
 556                                         ipoib_put_ah(neigh->ah);
 557                                 ipoib_neigh_free(dev, neigh);
 558                                 goto err_drop;
 559                         }
 560                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 561                                 __skb_queue_tail(&neigh->queue, skb);
 562                         else {
 563                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 564                                            skb_queue_len(&neigh->queue));
 565                                 goto err_drop;
 566                         }
 567                 } else
 568                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 569         } else {
 570                 neigh->ah  = NULL;
 571
 572                 if (!path->query && path_rec_start(dev, path))
 573                         goto err_list;
 574
 575                 __skb_queue_tail(&neigh->queue, skb);
 576         }
 577
 578         spin_unlock(&priv->lock);
 579         return;
 580
 581 err_list:
 582         list_del(&neigh->list);
 583
 584 err_path:
 585         ipoib_neigh_free(dev, neigh);
 586 err_drop:
 587         ++dev->stats.tx_dropped;
 588         dev_kfree_skb_any(skb);
 589
 590         spin_unlock(&priv->lock);
 591 }
 592
 593 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 594 {
 595         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 596
 597         /* Look up path record for unicasts */
 598         if (skb->dst->neighbour->ha[4] != 0xff) {
 599                 neigh_add_path(skb, dev);
 600                 return;
 601         }
 602
 603         /* Add in the P_Key for multicasts */
 604         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 605         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 606         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 607 }
 608
 609 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 610                              struct ipoib_pseudoheader *phdr)
 611 {
 612         struct ipoib_dev_priv *priv = netdev_priv(dev);
 613         struct ipoib_path *path;
 614
 615         /*
 616          * We can only be called from ipoib_start_xmit, so we're
 617          * inside tx_lock -- no need to save/restore flags.
 618          */
 619         spin_lock(&priv->lock);
 620
 621         path = __path_find(dev, phdr->hwaddr + 4);
 622         if (!path) {
 623                 path = path_rec_create(dev, phdr->hwaddr + 4);
 624                 if (path) {
 625                         /* put pseudoheader back on for next time */
 626                         skb_push(skb, sizeof *phdr);
 627                         __skb_queue_tail(&path->queue, skb);
 628
 629                         if (path_rec_start(dev, path)) {
 630                                 spin_unlock(&priv->lock);
 631                                 path_free(dev, path);
 632                                 return;
 633                         } else
 634                                 __path_add(dev, path);
 635                 } else {
 636                         ++dev->stats.tx_dropped;
 637                         dev_kfree_skb_any(skb);
 638                 }
 639
 640                 spin_unlock(&priv->lock);
 641                 return;
 642         }
 643
 644         if (path->ah) {
 645                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 646                           be16_to_cpu(path->pathrec.dlid));
 647
 648                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 649         } else if ((path->query || !path_rec_start(dev, path)) &&
 650                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 651                 /* put pseudoheader back on for next time */
 652                 skb_push(skb, sizeof *phdr);
 653                 __skb_queue_tail(&path->queue, skb);
 654         } else {
 655                 ++dev->stats.tx_dropped;
 656                 dev_kfree_skb_any(skb);
 657         }
 658
 659         spin_unlock(&priv->lock);
 660 }
 661
 662 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 663 {
 664         struct ipoib_dev_priv *priv = netdev_priv(dev);
 665         struct ipoib_neigh *neigh;
 666         unsigned long flags;
 667
 668         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 669                 return NETDEV_TX_LOCKED;
 670
 671         /*
 672          * Check if our queue is stopped.  Since we have the LLTX bit
 673          * set, we can't rely on netif_stop_queue() preventing our
 674          * xmit function from being called with a full queue.
 675          */
 676         if (unlikely(netif_queue_stopped(dev))) {
 677                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 678                 return NETDEV_TX_BUSY;
 679         }
 680
 681         if (likely(skb->dst && skb->dst->neighbour)) {
 682                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 683                         ipoib_path_lookup(skb, dev);
 684                         goto out;
 685                 }
 686
 687                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 688
 689                 if (ipoib_cm_get(neigh)) {
 690                         if (ipoib_cm_up(neigh)) {
 691                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 692                                 goto out;
 693                         }
 694                 } else if (neigh->ah) {
 695                         if (unlikely(memcmp(&neigh->dgid.raw,
 696                                             skb->dst->neighbour->ha + 4,
 697                                             sizeof(union ib_gid)))) {
 698                                 spin_lock(&priv->lock);
 699                                 /*
 700                                  * It's safe to call ipoib_put_ah() inside
 701                                  * priv->lock here, because we know that
 702                                  * path->ah will always hold one more reference,
 703                                  * so ipoib_put_ah() will never do more than
 704                                  * decrement the ref count.
 705                                  */
 706                                 ipoib_put_ah(neigh->ah);
 707                                 list_del(&neigh->list);
 708                                 ipoib_neigh_free(dev, neigh);
 709                                 spin_unlock(&priv->lock);
 710                                 ipoib_path_lookup(skb, dev);
 711                                 goto out;
 712                         }
 713
 714                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 715                         goto out;
 716                 }
 717
 718                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 719                         spin_lock(&priv->lock);
 720                         __skb_queue_tail(&neigh->queue, skb);
 721                         spin_unlock(&priv->lock);
 722                 } else {
 723                         ++dev->stats.tx_dropped;
 724                         dev_kfree_skb_any(skb);
 725                 }
 726         } else {
 727                 struct ipoib_pseudoheader *phdr =
 728                         (struct ipoib_pseudoheader *) skb->data;
 729                 skb_pull(skb, sizeof *phdr);
 730
 731                 if (phdr->hwaddr[4] == 0xff) {
 732                         /* Add in the P_Key for multicast*/
 733                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 734                         phdr->hwaddr[9] = priv->pkey & 0xff;
 735
 736                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 737                 } else {
 738                         /* unicast GID -- should be ARP or RARP reply */
 739
 740                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 741                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 742                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 743                                            IPOIB_GID_FMT "\n",
 744                                            skb->dst ? "neigh" : "dst",
 745                                            be16_to_cpup((__be16 *) skb->data),
 746                                            IPOIB_QPN(phdr->hwaddr),
 747                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 748                                 dev_kfree_skb_any(skb);
 749                                 ++dev->stats.tx_dropped;
 750                                 goto out;
 751                         }
 752
 753                         unicast_arp_send(skb, dev, phdr);
 754                 }
 755         }
 756
 757 out:
 758         spin_unlock_irqrestore(&priv->tx_lock, flags);
 759
 760         return NETDEV_TX_OK;
 761 }
 762
 763 static void ipoib_timeout(struct net_device *dev)
 764 {
 765         struct ipoib_dev_priv *priv = netdev_priv(dev);
 766
 767         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 768                    jiffies_to_msecs(jiffies - dev->trans_start));
 769         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 770                    netif_queue_stopped(dev),
 771                    priv->tx_head, priv->tx_tail);
 772         /* XXX reset QP, etc. */
 773 }
 774
 775 static int ipoib_hard_header(struct sk_buff *skb,
 776                              struct net_device *dev,
 777                              unsigned short type,
 778                              const void *daddr, const void *saddr, unsigned len)
 779 {
 780         struct ipoib_header *header;
 781
 782         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 783
 784         header->proto = htons(type);
 785         header->reserved = 0;
 786
 787         /*
 788          * If we don't have a neighbour structure, stuff the
 789          * destination address onto the front of the skb so we can
 790          * figure out where to send the packet later.
 791          */
 792         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 793                 struct ipoib_pseudoheader *phdr =
 794                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 795                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 796         }
 797
 798         return 0;
 799 }
 800
 801 static void ipoib_set_mcast_list(struct net_device *dev)
 802 {
 803         struct ipoib_dev_priv *priv = netdev_priv(dev);
 804
 805         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 806                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 807                 return;
 808         }
 809
 810         queue_work(ipoib_workqueue, &priv->restart_task);
 811 }
 812
 813 static void ipoib_neigh_cleanup(struct neighbour *n)
 814 {
 815         struct ipoib_neigh *neigh;
 816         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 817         unsigned long flags;
 818         struct ipoib_ah *ah = NULL;
 819
 820         ipoib_dbg(priv,
 821                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 822                   IPOIB_QPN(n->ha),
 823                   IPOIB_GID_RAW_ARG(n->ha + 4));
 824
 825         spin_lock_irqsave(&priv->lock, flags);
 826
 827         neigh = *to_ipoib_neigh(n);
 828         if (neigh) {
 829                 if (neigh->ah)
 830                         ah = neigh->ah;
 831                 list_del(&neigh->list);
 832                 ipoib_neigh_free(n->dev, neigh);
 833         }
 834
 835         spin_unlock_irqrestore(&priv->lock, flags);
 836
 837         if (ah)
 838                 ipoib_put_ah(ah);
 839 }
 840
 841 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
 842 {
 843         struct ipoib_neigh *neigh;
 844
 845         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 846         if (!neigh)
 847                 return NULL;
 848
 849         neigh->neighbour = neighbour;
 850         *to_ipoib_neigh(neighbour) = neigh;
 851         skb_queue_head_init(&neigh->queue);
 852         ipoib_cm_set(neigh, NULL);
 853
 854         return neigh;
 855 }
 856
 857 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 858 {
 859         struct sk_buff *skb;
 860         *to_ipoib_neigh(neigh->neighbour) = NULL;
 861         while ((skb = __skb_dequeue(&neigh->queue))) {
 862                 ++dev->stats.tx_dropped;
 863                 dev_kfree_skb_any(skb);
 864         }
 865         if (ipoib_cm_get(neigh))
 866                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 867         kfree(neigh);
 868 }
 869
 870 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 871 {
 872         parms->neigh_cleanup = ipoib_neigh_cleanup;
 873
 874         return 0;
 875 }
 876
 877 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 878 {
 879         struct ipoib_dev_priv *priv = netdev_priv(dev);
 880
 881         /* Allocate RX/TX "rings" to hold queued skbs */
 882         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 883                                 GFP_KERNEL);
 884         if (!priv->rx_ring) {
 885                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 886                        ca->name, ipoib_recvq_size);
 887                 goto out;
 888         }
 889
 890         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
 891                                 GFP_KERNEL);
 892         if (!priv->tx_ring) {
 893                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 894                        ca->name, ipoib_sendq_size);
 895                 goto out_rx_ring_cleanup;
 896         }
 897
 898         /* priv->tx_head & tx_tail are already 0 */
 899
 900         if (ipoib_ib_dev_init(dev, ca, port))
 901                 goto out_tx_ring_cleanup;
 902
 903         return 0;
 904
 905 out_tx_ring_cleanup:
 906         kfree(priv->tx_ring);
 907
 908 out_rx_ring_cleanup:
 909         kfree(priv->rx_ring);
 910
 911 out:
 912         return -ENOMEM;
 913 }
 914
 915 void ipoib_dev_cleanup(struct net_device *dev)
 916 {
 917         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 918
 919         ipoib_delete_debug_files(dev);
 920
 921         /* Delete any child interfaces first */
 922         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 923                 unregister_netdev(cpriv->dev);
 924                 ipoib_dev_cleanup(cpriv->dev);
 925                 free_netdev(cpriv->dev);
 926         }
 927
 928         ipoib_ib_dev_cleanup(dev);
 929
 930         kfree(priv->rx_ring);
 931         kfree(priv->tx_ring);
 932
 933         priv->rx_ring = NULL;
 934         priv->tx_ring = NULL;
 935 }
 936
 937 static const struct header_ops ipoib_header_ops = {
 938         .create = ipoib_hard_header,
 939 };
 940
 941 static void ipoib_setup(struct net_device *dev)
 942 {
 943         struct ipoib_dev_priv *priv = netdev_priv(dev);
 944
 945         dev->open                = ipoib_open;
 946         dev->stop                = ipoib_stop;
 947         dev->change_mtu          = ipoib_change_mtu;
 948         dev->hard_start_xmit     = ipoib_start_xmit;
 949         dev->tx_timeout          = ipoib_timeout;
 950         dev->header_ops          = &ipoib_header_ops;
 951         dev->set_multicast_list  = ipoib_set_mcast_list;
 952         dev->neigh_setup         = ipoib_neigh_setup_dev;
 953
 954         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
 955
 956         dev->watchdog_timeo      = HZ;
 957
 958         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 959
 960         /*
 961          * We add in INFINIBAND_ALEN to allow for the destination
 962          * address "pseudoheader" for skbs without neighbour struct.
 963          */
 964         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 965         dev->addr_len            = INFINIBAND_ALEN;
 966         dev->type                = ARPHRD_INFINIBAND;
 967         dev->tx_queue_len        = ipoib_sendq_size * 2;
 968         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
 969
 970         /* MTU will be reset when mcast join happens */
 971         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 972         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 973
 974         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 975
 976         netif_carrier_off(dev);
 977
 978         priv->dev = dev;
 979
 980         spin_lock_init(&priv->lock);
 981         spin_lock_init(&priv->tx_lock);
 982
 983         mutex_init(&priv->mcast_mutex);
 984         mutex_init(&priv->vlan_mutex);
 985
 986         INIT_LIST_HEAD(&priv->path_list);
 987         INIT_LIST_HEAD(&priv->child_intfs);
 988         INIT_LIST_HEAD(&priv->dead_ahs);
 989         INIT_LIST_HEAD(&priv->multicast_list);
 990
 991         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
 992         INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
 993         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 994         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
 995         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
 996         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
 997 }
 998
 999 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1000 {
1001         struct net_device *dev;
1002
1003         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1004                            ipoib_setup);
1005         if (!dev)
1006                 return NULL;
1007
1008         return netdev_priv(dev);
1009 }
1010
1011 static ssize_t show_pkey(struct device *dev,
1012                          struct device_attribute *attr, char *buf)
1013 {
1014         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1015
1016         return sprintf(buf, "0x%04x\n", priv->pkey);
1017 }
1018 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1019
1020 static ssize_t show_umcast(struct device *dev,
1021                            struct device_attribute *attr, char *buf)
1022 {
1023         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1024
1025         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1026 }
1027
1028 static ssize_t set_umcast(struct device *dev,
1029                           struct device_attribute *attr,
1030                           const char *buf, size_t count)
1031 {
1032         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1033         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1034
1035         if (umcast_val > 0) {
1036                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1037                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1038                                 "by userspace\n");
1039         } else
1040                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1041
1042         return count;
1043 }
1044 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1045
1046 int ipoib_add_umcast_attr(struct net_device *dev)
1047 {
1048         return device_create_file(&dev->dev, &dev_attr_umcast);
1049 }
1050
1051 static ssize_t create_child(struct device *dev,
1052                             struct device_attribute *attr,
1053                             const char *buf, size_t count)
1054 {
1055         int pkey;
1056         int ret;
1057
1058         if (sscanf(buf, "%i", &pkey) != 1)
1059                 return -EINVAL;
1060
1061         if (pkey < 0 || pkey > 0xffff)
1062                 return -EINVAL;
1063
1064         /*
1065          * Set the full membership bit, so that we join the right
1066          * broadcast group, etc.
1067          */
1068         pkey |= 0x8000;
1069
1070         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1071
1072         return ret ? ret : count;
1073 }
1074 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1075
1076 static ssize_t delete_child(struct device *dev,
1077                             struct device_attribute *attr,
1078                             const char *buf, size_t count)
1079 {
1080         int pkey;
1081         int ret;
1082
1083         if (sscanf(buf, "%i", &pkey) != 1)
1084                 return -EINVAL;
1085
1086         if (pkey < 0 || pkey > 0xffff)
1087                 return -EINVAL;
1088
1089         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1090
1091         return ret ? ret : count;
1092
1093 }
1094 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1095
1096 int ipoib_add_pkey_attr(struct net_device *dev)
1097 {
1098         return device_create_file(&dev->dev, &dev_attr_pkey);
1099 }
1100
1101 static struct net_device *ipoib_add_port(const char *format,
1102                                          struct ib_device *hca, u8 port)
1103 {
1104         struct ipoib_dev_priv *priv;
1105         int result = -ENOMEM;
1106
1107         priv = ipoib_intf_alloc(format);
1108         if (!priv)
1109                 goto alloc_mem_failed;
1110
1111         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1112
1113         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1114         if (result) {
1115                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1116                        hca->name, port, result);
1117                 goto device_init_failed;
1118         }
1119
1120         /*
1121          * Set the full membership bit, so that we join the right
1122          * broadcast group, etc.
1123          */
1124         priv->pkey |= 0x8000;
1125
1126         priv->dev->broadcast[8] = priv->pkey >> 8;
1127         priv->dev->broadcast[9] = priv->pkey & 0xff;
1128
1129         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1130         if (result) {
1131                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1132                        hca->name, port, result);
1133                 goto device_init_failed;
1134         } else
1135                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1136
1137
1138         result = ipoib_dev_init(priv->dev, hca, port);
1139         if (result < 0) {
1140                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1141                        hca->name, port, result);
1142                 goto device_init_failed;
1143         }
1144
1145         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1146                               priv->ca, ipoib_event);
1147         result = ib_register_event_handler(&priv->event_handler);
1148         if (result < 0) {
1149                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1150                        "port %d (ret = %d)\n",
1151                        hca->name, port, result);
1152                 goto event_failed;
1153         }
1154
1155         result = register_netdev(priv->dev);
1156         if (result) {
1157                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1158                        hca->name, port, result);
1159                 goto register_failed;
1160         }
1161
1162         ipoib_create_debug_files(priv->dev);
1163
1164         if (ipoib_cm_add_mode_attr(priv->dev))
1165                 goto sysfs_failed;
1166         if (ipoib_add_pkey_attr(priv->dev))
1167                 goto sysfs_failed;
1168         if (ipoib_add_umcast_attr(priv->dev))
1169                 goto sysfs_failed;
1170         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1171                 goto sysfs_failed;
1172         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1173                 goto sysfs_failed;
1174
1175         return priv->dev;
1176
1177 sysfs_failed:
1178         ipoib_delete_debug_files(priv->dev);
1179         unregister_netdev(priv->dev);
1180
1181 register_failed:
1182         ib_unregister_event_handler(&priv->event_handler);
1183         flush_scheduled_work();
1184
1185 event_failed:
1186         ipoib_dev_cleanup(priv->dev);
1187
1188 device_init_failed:
1189         free_netdev(priv->dev);
1190
1191 alloc_mem_failed:
1192         return ERR_PTR(result);
1193 }
1194
1195 static void ipoib_add_one(struct ib_device *device)
1196 {
1197         struct list_head *dev_list;
1198         struct net_device *dev;
1199         struct ipoib_dev_priv *priv;
1200         int s, e, p;
1201
1202         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1203                 return;
1204
1205         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1206         if (!dev_list)
1207                 return;
1208
1209         INIT_LIST_HEAD(dev_list);
1210
1211         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1212                 s = 0;
1213                 e = 0;
1214         } else {
1215                 s = 1;
1216                 e = device->phys_port_cnt;
1217         }
1218
1219         for (p = s; p <= e; ++p) {
1220                 dev = ipoib_add_port("ib%d", device, p);
1221                 if (!IS_ERR(dev)) {
1222                         priv = netdev_priv(dev);
1223                         list_add_tail(&priv->list, dev_list);
1224                 }
1225         }
1226
1227         ib_set_client_data(device, &ipoib_client, dev_list);
1228 }
1229
1230 static void ipoib_remove_one(struct ib_device *device)
1231 {
1232         struct ipoib_dev_priv *priv, *tmp;
1233         struct list_head *dev_list;
1234
1235         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1236                 return;
1237
1238         dev_list = ib_get_client_data(device, &ipoib_client);
1239
1240         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1241                 ib_unregister_event_handler(&priv->event_handler);
1242                 flush_scheduled_work();
1243
1244                 unregister_netdev(priv->dev);
1245                 ipoib_dev_cleanup(priv->dev);
1246                 free_netdev(priv->dev);
1247         }
1248
1249         kfree(dev_list);
1250 }
1251
1252 static int __init ipoib_init_module(void)
1253 {
1254         int ret;
1255
1256         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1257         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1258         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1259
1260         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1261         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1262         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1263
1264         ret = ipoib_register_debugfs();
1265         if (ret)
1266                 return ret;
1267
1268         /*
1269          * We create our own workqueue mainly because we want to be
1270          * able to flush it when devices are being removed.  We can't
1271          * use schedule_work()/flush_scheduled_work() because both
1272          * unregister_netdev() and linkwatch_event take the rtnl lock,
1273          * so flush_scheduled_work() can deadlock during device
1274          * removal.
1275          */
1276         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1277         if (!ipoib_workqueue) {
1278                 ret = -ENOMEM;
1279                 goto err_fs;
1280         }
1281
1282         ib_sa_register_client(&ipoib_sa_client);
1283
1284         ret = ib_register_client(&ipoib_client);
1285         if (ret)
1286                 goto err_sa;
1287
1288         return 0;
1289
1290 err_sa:
1291         ib_sa_unregister_client(&ipoib_sa_client);
1292         destroy_workqueue(ipoib_workqueue);
1293
1294 err_fs:
1295         ipoib_unregister_debugfs();
1296
1297         return ret;
1298 }
1299
1300 static void __exit ipoib_cleanup_module(void)
1301 {
1302         ib_unregister_client(&ipoib_client);
1303         ib_sa_unregister_client(&ipoib_sa_client);
1304         ipoib_unregister_debugfs();
1305         destroy_workqueue(ipoib_workqueue);
1306 }
1307
1308 module_init(ipoib_init_module);
1309 module_exit(ipoib_cleanup_module);