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         /*
 152          * Now flush workqueue to make sure a scheduled task doesn't
 153          * bring our internal state back up.
 154          */
 155         flush_workqueue(ipoib_workqueue);
 156
 157         ipoib_ib_dev_down(dev, 1);
 158         ipoib_ib_dev_stop(dev, 1);
 159
 160         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 161                 struct ipoib_dev_priv *cpriv;
 162
 163                 /* Bring down any child interfaces too */
 164                 mutex_lock(&priv->vlan_mutex);
 165                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 166                         int flags;
 167
 168                         flags = cpriv->dev->flags;
 169                         if (!(flags & IFF_UP))
 170                                 continue;
 171
 172                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 173                 }
 174                 mutex_unlock(&priv->vlan_mutex);
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 181 {
 182         struct ipoib_dev_priv *priv = netdev_priv(dev);
 183
 184         /* dev->mtu > 2K ==> connected mode */
 185         if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
 186                 if (new_mtu > priv->mcast_mtu)
 187                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 188                                    priv->mcast_mtu);
 189                 dev->mtu = new_mtu;
 190                 return 0;
 191         }
 192
 193         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN) {
 194                 return -EINVAL;
 195         }
 196
 197         priv->admin_mtu = new_mtu;
 198
 199         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 200
 201         return 0;
 202 }
 203
 204 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 205 {
 206         struct ipoib_dev_priv *priv = netdev_priv(dev);
 207         struct rb_node *n = priv->path_tree.rb_node;
 208         struct ipoib_path *path;
 209         int ret;
 210
 211         while (n) {
 212                 path = rb_entry(n, struct ipoib_path, rb_node);
 213
 214                 ret = memcmp(gid, path->pathrec.dgid.raw,
 215                              sizeof (union ib_gid));
 216
 217                 if (ret < 0)
 218                         n = n->rb_left;
 219                 else if (ret > 0)
 220                         n = n->rb_right;
 221                 else
 222                         return path;
 223         }
 224
 225         return NULL;
 226 }
 227
 228 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 229 {
 230         struct ipoib_dev_priv *priv = netdev_priv(dev);
 231         struct rb_node **n = &priv->path_tree.rb_node;
 232         struct rb_node *pn = NULL;
 233         struct ipoib_path *tpath;
 234         int ret;
 235
 236         while (*n) {
 237                 pn = *n;
 238                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 239
 240                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 241                              sizeof (union ib_gid));
 242                 if (ret < 0)
 243                         n = &pn->rb_left;
 244                 else if (ret > 0)
 245                         n = &pn->rb_right;
 246                 else
 247                         return -EEXIST;
 248         }
 249
 250         rb_link_node(&path->rb_node, pn, n);
 251         rb_insert_color(&path->rb_node, &priv->path_tree);
 252
 253         list_add_tail(&path->list, &priv->path_list);
 254
 255         return 0;
 256 }
 257
 258 static void path_free(struct net_device *dev, struct ipoib_path *path)
 259 {
 260         struct ipoib_dev_priv *priv = netdev_priv(dev);
 261         struct ipoib_neigh *neigh, *tn;
 262         struct sk_buff *skb;
 263         unsigned long flags;
 264
 265         while ((skb = __skb_dequeue(&path->queue)))
 266                 dev_kfree_skb_irq(skb);
 267
 268         spin_lock_irqsave(&priv->lock, flags);
 269
 270         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 271                 /*
 272                  * It's safe to call ipoib_put_ah() inside priv->lock
 273                  * here, because we know that path->ah will always
 274                  * hold one more reference, so ipoib_put_ah() will
 275                  * never do more than decrement the ref count.
 276                  */
 277                 if (neigh->ah)
 278                         ipoib_put_ah(neigh->ah);
 279
 280                 ipoib_neigh_free(dev, neigh);
 281         }
 282
 283         spin_unlock_irqrestore(&priv->lock, flags);
 284
 285         if (path->ah)
 286                 ipoib_put_ah(path->ah);
 287
 288         kfree(path);
 289 }
 290
 291 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 292
 293 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 294 {
 295         struct ipoib_path_iter *iter;
 296
 297         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 298         if (!iter)
 299                 return NULL;
 300
 301         iter->dev = dev;
 302         memset(iter->path.pathrec.dgid.raw, 0, 16);
 303
 304         if (ipoib_path_iter_next(iter)) {
 305                 kfree(iter);
 306                 return NULL;
 307         }
 308
 309         return iter;
 310 }
 311
 312 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 313 {
 314         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 315         struct rb_node *n;
 316         struct ipoib_path *path;
 317         int ret = 1;
 318
 319         spin_lock_irq(&priv->lock);
 320
 321         n = rb_first(&priv->path_tree);
 322
 323         while (n) {
 324                 path = rb_entry(n, struct ipoib_path, rb_node);
 325
 326                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 327                            sizeof (union ib_gid)) < 0) {
 328                         iter->path = *path;
 329                         ret = 0;
 330                         break;
 331                 }
 332
 333                 n = rb_next(n);
 334         }
 335
 336         spin_unlock_irq(&priv->lock);
 337
 338         return ret;
 339 }
 340
 341 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 342                           struct ipoib_path *path)
 343 {
 344         *path = iter->path;
 345 }
 346
 347 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 348
 349 void ipoib_flush_paths(struct net_device *dev)
 350 {
 351         struct ipoib_dev_priv *priv = netdev_priv(dev);
 352         struct ipoib_path *path, *tp;
 353         LIST_HEAD(remove_list);
 354
 355         spin_lock_irq(&priv->tx_lock);
 356         spin_lock(&priv->lock);
 357
 358         list_splice(&priv->path_list, &remove_list);
 359         INIT_LIST_HEAD(&priv->path_list);
 360
 361         list_for_each_entry(path, &remove_list, list)
 362                 rb_erase(&path->rb_node, &priv->path_tree);
 363
 364         list_for_each_entry_safe(path, tp, &remove_list, list) {
 365                 if (path->query)
 366                         ib_sa_cancel_query(path->query_id, path->query);
 367                 spin_unlock(&priv->lock);
 368                 spin_unlock_irq(&priv->tx_lock);
 369                 wait_for_completion(&path->done);
 370                 path_free(dev, path);
 371                 spin_lock_irq(&priv->tx_lock);
 372                 spin_lock(&priv->lock);
 373         }
 374         spin_unlock(&priv->lock);
 375         spin_unlock_irq(&priv->tx_lock);
 376 }
 377
 378 static void path_rec_completion(int status,
 379                                 struct ib_sa_path_rec *pathrec,
 380                                 void *path_ptr)
 381 {
 382         struct ipoib_path *path = path_ptr;
 383         struct net_device *dev = path->dev;
 384         struct ipoib_dev_priv *priv = netdev_priv(dev);
 385         struct ipoib_ah *ah = NULL;
 386         struct ipoib_neigh *neigh, *tn;
 387         struct sk_buff_head skqueue;
 388         struct sk_buff *skb;
 389         unsigned long flags;
 390
 391         if (!status)
 392                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 393                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 394         else
 395                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 396                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 397
 398         skb_queue_head_init(&skqueue);
 399
 400         if (!status) {
 401                 struct ib_ah_attr av;
 402
 403                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 404                         ah = ipoib_create_ah(dev, priv->pd, &av);
 405         }
 406
 407         spin_lock_irqsave(&priv->lock, flags);
 408
 409         path->ah = ah;
 410
 411         if (ah) {
 412                 path->pathrec = *pathrec;
 413
 414                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 415                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 416
 417                 while ((skb = __skb_dequeue(&path->queue)))
 418                         __skb_queue_tail(&skqueue, skb);
 419
 420                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 421                         kref_get(&path->ah->ref);
 422                         neigh->ah = path->ah;
 423                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 424                                sizeof(union ib_gid));
 425
 426                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 427                                 if (!ipoib_cm_get(neigh))
 428                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 429                                                                                path,
 430                                                                                neigh));
 431                                 if (!ipoib_cm_get(neigh)) {
 432                                         list_del(&neigh->list);
 433                                         if (neigh->ah)
 434                                                 ipoib_put_ah(neigh->ah);
 435                                         ipoib_neigh_free(dev, neigh);
 436                                         continue;
 437                                 }
 438                         }
 439
 440                         while ((skb = __skb_dequeue(&neigh->queue)))
 441                                 __skb_queue_tail(&skqueue, skb);
 442                 }
 443         }
 444
 445         path->query = NULL;
 446         complete(&path->done);
 447
 448         spin_unlock_irqrestore(&priv->lock, flags);
 449
 450         while ((skb = __skb_dequeue(&skqueue))) {
 451                 skb->dev = dev;
 452                 if (dev_queue_xmit(skb))
 453                         ipoib_warn(priv, "dev_queue_xmit failed "
 454                                    "to requeue packet\n");
 455         }
 456 }
 457
 458 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 459 {
 460         struct ipoib_dev_priv *priv = netdev_priv(dev);
 461         struct ipoib_path *path;
 462
 463         if (!priv->broadcast)
 464                 return NULL;
 465
 466         path = kzalloc(sizeof *path, GFP_ATOMIC);
 467         if (!path)
 468                 return NULL;
 469
 470         path->dev = dev;
 471
 472         skb_queue_head_init(&path->queue);
 473
 474         INIT_LIST_HEAD(&path->neigh_list);
 475
 476         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 477         path->pathrec.sgid          = priv->local_gid;
 478         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 479         path->pathrec.numb_path     = 1;
 480         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 481
 482         return path;
 483 }
 484
 485 static int path_rec_start(struct net_device *dev,
 486                           struct ipoib_path *path)
 487 {
 488         struct ipoib_dev_priv *priv = netdev_priv(dev);
 489
 490         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 491                   IPOIB_GID_ARG(path->pathrec.dgid));
 492
 493         init_completion(&path->done);
 494
 495         path->query_id =
 496                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 497                                    &path->pathrec,
 498                                    IB_SA_PATH_REC_DGID          |
 499                                    IB_SA_PATH_REC_SGID          |
 500                                    IB_SA_PATH_REC_NUMB_PATH     |
 501                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 502                                    IB_SA_PATH_REC_PKEY,
 503                                    1000, GFP_ATOMIC,
 504                                    path_rec_completion,
 505                                    path, &path->query);
 506         if (path->query_id < 0) {
 507                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 508                 path->query = NULL;
 509                 return path->query_id;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 516 {
 517         struct ipoib_dev_priv *priv = netdev_priv(dev);
 518         struct ipoib_path *path;
 519         struct ipoib_neigh *neigh;
 520
 521         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 522         if (!neigh) {
 523                 ++dev->stats.tx_dropped;
 524                 dev_kfree_skb_any(skb);
 525                 return;
 526         }
 527
 528         /*
 529          * We can only be called from ipoib_start_xmit, so we're
 530          * inside tx_lock -- no need to save/restore flags.
 531          */
 532         spin_lock(&priv->lock);
 533
 534         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 535         if (!path) {
 536                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 537                 if (!path)
 538                         goto err_path;
 539
 540                 __path_add(dev, path);
 541         }
 542
 543         list_add_tail(&neigh->list, &path->neigh_list);
 544
 545         if (path->ah) {
 546                 kref_get(&path->ah->ref);
 547                 neigh->ah = path->ah;
 548                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 549                        sizeof(union ib_gid));
 550
 551                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 552                         if (!ipoib_cm_get(neigh))
 553                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 554                         if (!ipoib_cm_get(neigh)) {
 555                                 list_del(&neigh->list);
 556                                 if (neigh->ah)
 557                                         ipoib_put_ah(neigh->ah);
 558                                 ipoib_neigh_free(dev, neigh);
 559                                 goto err_drop;
 560                         }
 561                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 562                                 __skb_queue_tail(&neigh->queue, skb);
 563                         else {
 564                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 565                                            skb_queue_len(&neigh->queue));
 566                                 goto err_drop;
 567                         }
 568                 } else
 569                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 570         } else {
 571                 neigh->ah  = NULL;
 572
 573                 if (!path->query && path_rec_start(dev, path))
 574                         goto err_list;
 575
 576                 __skb_queue_tail(&neigh->queue, skb);
 577         }
 578
 579         spin_unlock(&priv->lock);
 580         return;
 581
 582 err_list:
 583         list_del(&neigh->list);
 584
 585 err_path:
 586         ipoib_neigh_free(dev, neigh);
 587 err_drop:
 588         ++dev->stats.tx_dropped;
 589         dev_kfree_skb_any(skb);
 590
 591         spin_unlock(&priv->lock);
 592 }
 593
 594 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 595 {
 596         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 597
 598         /* Look up path record for unicasts */
 599         if (skb->dst->neighbour->ha[4] != 0xff) {
 600                 neigh_add_path(skb, dev);
 601                 return;
 602         }
 603
 604         /* Add in the P_Key for multicasts */
 605         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 606         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 607         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 608 }
 609
 610 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 611                              struct ipoib_pseudoheader *phdr)
 612 {
 613         struct ipoib_dev_priv *priv = netdev_priv(dev);
 614         struct ipoib_path *path;
 615
 616         /*
 617          * We can only be called from ipoib_start_xmit, so we're
 618          * inside tx_lock -- no need to save/restore flags.
 619          */
 620         spin_lock(&priv->lock);
 621
 622         path = __path_find(dev, phdr->hwaddr + 4);
 623         if (!path) {
 624                 path = path_rec_create(dev, phdr->hwaddr + 4);
 625                 if (path) {
 626                         /* put pseudoheader back on for next time */
 627                         skb_push(skb, sizeof *phdr);
 628                         __skb_queue_tail(&path->queue, skb);
 629
 630                         if (path_rec_start(dev, path)) {
 631                                 spin_unlock(&priv->lock);
 632                                 path_free(dev, path);
 633                                 return;
 634                         } else
 635                                 __path_add(dev, path);
 636                 } else {
 637                         ++dev->stats.tx_dropped;
 638                         dev_kfree_skb_any(skb);
 639                 }
 640
 641                 spin_unlock(&priv->lock);
 642                 return;
 643         }
 644
 645         if (path->ah) {
 646                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 647                           be16_to_cpu(path->pathrec.dlid));
 648
 649                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 650         } else if ((path->query || !path_rec_start(dev, path)) &&
 651                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 652                 /* put pseudoheader back on for next time */
 653                 skb_push(skb, sizeof *phdr);
 654                 __skb_queue_tail(&path->queue, skb);
 655         } else {
 656                 ++dev->stats.tx_dropped;
 657                 dev_kfree_skb_any(skb);
 658         }
 659
 660         spin_unlock(&priv->lock);
 661 }
 662
 663 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 664 {
 665         struct ipoib_dev_priv *priv = netdev_priv(dev);
 666         struct ipoib_neigh *neigh;
 667         unsigned long flags;
 668
 669         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 670                 return NETDEV_TX_LOCKED;
 671
 672         /*
 673          * Check if our queue is stopped.  Since we have the LLTX bit
 674          * set, we can't rely on netif_stop_queue() preventing our
 675          * xmit function from being called with a full queue.
 676          */
 677         if (unlikely(netif_queue_stopped(dev))) {
 678                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 679                 return NETDEV_TX_BUSY;
 680         }
 681
 682         if (likely(skb->dst && skb->dst->neighbour)) {
 683                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 684                         ipoib_path_lookup(skb, dev);
 685                         goto out;
 686                 }
 687
 688                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 689
 690                 if (ipoib_cm_get(neigh)) {
 691                         if (ipoib_cm_up(neigh)) {
 692                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 693                                 goto out;
 694                         }
 695                 } else if (neigh->ah) {
 696                         if (unlikely((memcmp(&neigh->dgid.raw,
 697                                             skb->dst->neighbour->ha + 4,
 698                                             sizeof(union ib_gid))) ||
 699                                          (neigh->dev != dev))) {
 700                                 spin_lock(&priv->lock);
 701                                 /*
 702                                  * It's safe to call ipoib_put_ah() inside
 703                                  * priv->lock here, because we know that
 704                                  * path->ah will always hold one more reference,
 705                                  * so ipoib_put_ah() will never do more than
 706                                  * decrement the ref count.
 707                                  */
 708                                 ipoib_put_ah(neigh->ah);
 709                                 list_del(&neigh->list);
 710                                 ipoib_neigh_free(dev, neigh);
 711                                 spin_unlock(&priv->lock);
 712                                 ipoib_path_lookup(skb, dev);
 713                                 goto out;
 714                         }
 715
 716                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 717                         goto out;
 718                 }
 719
 720                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 721                         spin_lock(&priv->lock);
 722                         __skb_queue_tail(&neigh->queue, skb);
 723                         spin_unlock(&priv->lock);
 724                 } else {
 725                         ++dev->stats.tx_dropped;
 726                         dev_kfree_skb_any(skb);
 727                 }
 728         } else {
 729                 struct ipoib_pseudoheader *phdr =
 730                         (struct ipoib_pseudoheader *) skb->data;
 731                 skb_pull(skb, sizeof *phdr);
 732
 733                 if (phdr->hwaddr[4] == 0xff) {
 734                         /* Add in the P_Key for multicast*/
 735                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 736                         phdr->hwaddr[9] = priv->pkey & 0xff;
 737
 738                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 739                 } else {
 740                         /* unicast GID -- should be ARP or RARP reply */
 741
 742                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 743                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 744                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 745                                            IPOIB_GID_FMT "\n",
 746                                            skb->dst ? "neigh" : "dst",
 747                                            be16_to_cpup((__be16 *) skb->data),
 748                                            IPOIB_QPN(phdr->hwaddr),
 749                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 750                                 dev_kfree_skb_any(skb);
 751                                 ++dev->stats.tx_dropped;
 752                                 goto out;
 753                         }
 754
 755                         unicast_arp_send(skb, dev, phdr);
 756                 }
 757         }
 758
 759 out:
 760         spin_unlock_irqrestore(&priv->tx_lock, flags);
 761
 762         return NETDEV_TX_OK;
 763 }
 764
 765 static void ipoib_timeout(struct net_device *dev)
 766 {
 767         struct ipoib_dev_priv *priv = netdev_priv(dev);
 768
 769         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 770                    jiffies_to_msecs(jiffies - dev->trans_start));
 771         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 772                    netif_queue_stopped(dev),
 773                    priv->tx_head, priv->tx_tail);
 774         /* XXX reset QP, etc. */
 775 }
 776
 777 static int ipoib_hard_header(struct sk_buff *skb,
 778                              struct net_device *dev,
 779                              unsigned short type,
 780                              const void *daddr, const void *saddr, unsigned len)
 781 {
 782         struct ipoib_header *header;
 783
 784         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 785
 786         header->proto = htons(type);
 787         header->reserved = 0;
 788
 789         /*
 790          * If we don't have a neighbour structure, stuff the
 791          * destination address onto the front of the skb so we can
 792          * figure out where to send the packet later.
 793          */
 794         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 795                 struct ipoib_pseudoheader *phdr =
 796                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 797                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 798         }
 799
 800         return 0;
 801 }
 802
 803 static void ipoib_set_mcast_list(struct net_device *dev)
 804 {
 805         struct ipoib_dev_priv *priv = netdev_priv(dev);
 806
 807         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 808                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 809                 return;
 810         }
 811
 812         queue_work(ipoib_workqueue, &priv->restart_task);
 813 }
 814
 815 static void ipoib_neigh_cleanup(struct neighbour *n)
 816 {
 817         struct ipoib_neigh *neigh;
 818         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 819         unsigned long flags;
 820         struct ipoib_ah *ah = NULL;
 821
 822         neigh = *to_ipoib_neigh(n);
 823         if (neigh) {
 824                 priv = netdev_priv(neigh->dev);
 825                 ipoib_dbg(priv, "neigh_destructor for bonding device: %s\n",
 826                           n->dev->name);
 827         } else
 828                 return;
 829         ipoib_dbg(priv,
 830                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 831                   IPOIB_QPN(n->ha),
 832                   IPOIB_GID_RAW_ARG(n->ha + 4));
 833
 834         spin_lock_irqsave(&priv->lock, flags);
 835
 836         if (neigh->ah)
 837                 ah = neigh->ah;
 838         list_del(&neigh->list);
 839         ipoib_neigh_free(n->dev, neigh);
 840
 841         spin_unlock_irqrestore(&priv->lock, flags);
 842
 843         if (ah)
 844                 ipoib_put_ah(ah);
 845 }
 846
 847 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 848                                       struct net_device *dev)
 849 {
 850         struct ipoib_neigh *neigh;
 851
 852         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 853         if (!neigh)
 854                 return NULL;
 855
 856         neigh->neighbour = neighbour;
 857         neigh->dev = dev;
 858         *to_ipoib_neigh(neighbour) = neigh;
 859         skb_queue_head_init(&neigh->queue);
 860         ipoib_cm_set(neigh, NULL);
 861
 862         return neigh;
 863 }
 864
 865 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 866 {
 867         struct sk_buff *skb;
 868         *to_ipoib_neigh(neigh->neighbour) = NULL;
 869         while ((skb = __skb_dequeue(&neigh->queue))) {
 870                 ++dev->stats.tx_dropped;
 871                 dev_kfree_skb_any(skb);
 872         }
 873         if (ipoib_cm_get(neigh))
 874                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 875         kfree(neigh);
 876 }
 877
 878 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 879 {
 880         parms->neigh_cleanup = ipoib_neigh_cleanup;
 881
 882         return 0;
 883 }
 884
 885 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 886 {
 887         struct ipoib_dev_priv *priv = netdev_priv(dev);
 888
 889         /* Allocate RX/TX "rings" to hold queued skbs */
 890         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 891                                 GFP_KERNEL);
 892         if (!priv->rx_ring) {
 893                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 894                        ca->name, ipoib_recvq_size);
 895                 goto out;
 896         }
 897
 898         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
 899                                 GFP_KERNEL);
 900         if (!priv->tx_ring) {
 901                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 902                        ca->name, ipoib_sendq_size);
 903                 goto out_rx_ring_cleanup;
 904         }
 905
 906         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 907
 908         if (ipoib_ib_dev_init(dev, ca, port))
 909                 goto out_tx_ring_cleanup;
 910
 911         return 0;
 912
 913 out_tx_ring_cleanup:
 914         kfree(priv->tx_ring);
 915
 916 out_rx_ring_cleanup:
 917         kfree(priv->rx_ring);
 918
 919 out:
 920         return -ENOMEM;
 921 }
 922
 923 void ipoib_dev_cleanup(struct net_device *dev)
 924 {
 925         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 926
 927         ipoib_delete_debug_files(dev);
 928
 929         /* Delete any child interfaces first */
 930         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 931                 unregister_netdev(cpriv->dev);
 932                 ipoib_dev_cleanup(cpriv->dev);
 933                 free_netdev(cpriv->dev);
 934         }
 935
 936         ipoib_ib_dev_cleanup(dev);
 937
 938         kfree(priv->rx_ring);
 939         kfree(priv->tx_ring);
 940
 941         priv->rx_ring = NULL;
 942         priv->tx_ring = NULL;
 943 }
 944
 945 static const struct header_ops ipoib_header_ops = {
 946         .create = ipoib_hard_header,
 947 };
 948
 949 static void ipoib_setup(struct net_device *dev)
 950 {
 951         struct ipoib_dev_priv *priv = netdev_priv(dev);
 952
 953         dev->open                = ipoib_open;
 954         dev->stop                = ipoib_stop;
 955         dev->change_mtu          = ipoib_change_mtu;
 956         dev->hard_start_xmit     = ipoib_start_xmit;
 957         dev->tx_timeout          = ipoib_timeout;
 958         dev->header_ops          = &ipoib_header_ops;
 959         dev->set_multicast_list  = ipoib_set_mcast_list;
 960         dev->neigh_setup         = ipoib_neigh_setup_dev;
 961
 962         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
 963
 964         dev->watchdog_timeo      = HZ;
 965
 966         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 967
 968         /*
 969          * We add in INFINIBAND_ALEN to allow for the destination
 970          * address "pseudoheader" for skbs without neighbour struct.
 971          */
 972         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 973         dev->addr_len            = INFINIBAND_ALEN;
 974         dev->type                = ARPHRD_INFINIBAND;
 975         dev->tx_queue_len        = ipoib_sendq_size * 2;
 976         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
 977
 978         /* MTU will be reset when mcast join happens */
 979         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 980         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 981
 982         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 983
 984         netif_carrier_off(dev);
 985
 986         priv->dev = dev;
 987
 988         spin_lock_init(&priv->lock);
 989         spin_lock_init(&priv->tx_lock);
 990
 991         mutex_init(&priv->mcast_mutex);
 992         mutex_init(&priv->vlan_mutex);
 993
 994         INIT_LIST_HEAD(&priv->path_list);
 995         INIT_LIST_HEAD(&priv->child_intfs);
 996         INIT_LIST_HEAD(&priv->dead_ahs);
 997         INIT_LIST_HEAD(&priv->multicast_list);
 998
 999         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1000         INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
1001         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1002         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
1003         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1004         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1005 }
1006
1007 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1008 {
1009         struct net_device *dev;
1010
1011         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1012                            ipoib_setup);
1013         if (!dev)
1014                 return NULL;
1015
1016         return netdev_priv(dev);
1017 }
1018
1019 static ssize_t show_pkey(struct device *dev,
1020                          struct device_attribute *attr, char *buf)
1021 {
1022         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1023
1024         return sprintf(buf, "0x%04x\n", priv->pkey);
1025 }
1026 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1027
1028 static ssize_t show_umcast(struct device *dev,
1029                            struct device_attribute *attr, char *buf)
1030 {
1031         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1032
1033         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1034 }
1035
1036 static ssize_t set_umcast(struct device *dev,
1037                           struct device_attribute *attr,
1038                           const char *buf, size_t count)
1039 {
1040         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1041         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1042
1043         if (umcast_val > 0) {
1044                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1045                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1046                                 "by userspace\n");
1047         } else
1048                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1049
1050         return count;
1051 }
1052 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1053
1054 int ipoib_add_umcast_attr(struct net_device *dev)
1055 {
1056         return device_create_file(&dev->dev, &dev_attr_umcast);
1057 }
1058
1059 static ssize_t create_child(struct device *dev,
1060                             struct device_attribute *attr,
1061                             const char *buf, size_t count)
1062 {
1063         int pkey;
1064         int ret;
1065
1066         if (sscanf(buf, "%i", &pkey) != 1)
1067                 return -EINVAL;
1068
1069         if (pkey < 0 || pkey > 0xffff)
1070                 return -EINVAL;
1071
1072         /*
1073          * Set the full membership bit, so that we join the right
1074          * broadcast group, etc.
1075          */
1076         pkey |= 0x8000;
1077
1078         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1079
1080         return ret ? ret : count;
1081 }
1082 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1083
1084 static ssize_t delete_child(struct device *dev,
1085                             struct device_attribute *attr,
1086                             const char *buf, size_t count)
1087 {
1088         int pkey;
1089         int ret;
1090
1091         if (sscanf(buf, "%i", &pkey) != 1)
1092                 return -EINVAL;
1093
1094         if (pkey < 0 || pkey > 0xffff)
1095                 return -EINVAL;
1096
1097         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1098
1099         return ret ? ret : count;
1100
1101 }
1102 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1103
1104 int ipoib_add_pkey_attr(struct net_device *dev)
1105 {
1106         return device_create_file(&dev->dev, &dev_attr_pkey);
1107 }
1108
1109 static struct net_device *ipoib_add_port(const char *format,
1110                                          struct ib_device *hca, u8 port)
1111 {
1112         struct ipoib_dev_priv *priv;
1113         int result = -ENOMEM;
1114
1115         priv = ipoib_intf_alloc(format);
1116         if (!priv)
1117                 goto alloc_mem_failed;
1118
1119         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1120
1121         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1122         if (result) {
1123                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1124                        hca->name, port, result);
1125                 goto device_init_failed;
1126         }
1127
1128         /*
1129          * Set the full membership bit, so that we join the right
1130          * broadcast group, etc.
1131          */
1132         priv->pkey |= 0x8000;
1133
1134         priv->dev->broadcast[8] = priv->pkey >> 8;
1135         priv->dev->broadcast[9] = priv->pkey & 0xff;
1136
1137         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1138         if (result) {
1139                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1140                        hca->name, port, result);
1141                 goto device_init_failed;
1142         } else
1143                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1144
1145
1146         result = ipoib_dev_init(priv->dev, hca, port);
1147         if (result < 0) {
1148                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1149                        hca->name, port, result);
1150                 goto device_init_failed;
1151         }
1152
1153         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1154                               priv->ca, ipoib_event);
1155         result = ib_register_event_handler(&priv->event_handler);
1156         if (result < 0) {
1157                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1158                        "port %d (ret = %d)\n",
1159                        hca->name, port, result);
1160                 goto event_failed;
1161         }
1162
1163         result = register_netdev(priv->dev);
1164         if (result) {
1165                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1166                        hca->name, port, result);
1167                 goto register_failed;
1168         }
1169
1170         ipoib_create_debug_files(priv->dev);
1171
1172         if (ipoib_cm_add_mode_attr(priv->dev))
1173                 goto sysfs_failed;
1174         if (ipoib_add_pkey_attr(priv->dev))
1175                 goto sysfs_failed;
1176         if (ipoib_add_umcast_attr(priv->dev))
1177                 goto sysfs_failed;
1178         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1179                 goto sysfs_failed;
1180         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1181                 goto sysfs_failed;
1182
1183         return priv->dev;
1184
1185 sysfs_failed:
1186         ipoib_delete_debug_files(priv->dev);
1187         unregister_netdev(priv->dev);
1188
1189 register_failed:
1190         ib_unregister_event_handler(&priv->event_handler);
1191         flush_scheduled_work();
1192
1193 event_failed:
1194         ipoib_dev_cleanup(priv->dev);
1195
1196 device_init_failed:
1197         free_netdev(priv->dev);
1198
1199 alloc_mem_failed:
1200         return ERR_PTR(result);
1201 }
1202
1203 static void ipoib_add_one(struct ib_device *device)
1204 {
1205         struct list_head *dev_list;
1206         struct net_device *dev;
1207         struct ipoib_dev_priv *priv;
1208         int s, e, p;
1209
1210         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1211                 return;
1212
1213         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1214         if (!dev_list)
1215                 return;
1216
1217         INIT_LIST_HEAD(dev_list);
1218
1219         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1220                 s = 0;
1221                 e = 0;
1222         } else {
1223                 s = 1;
1224                 e = device->phys_port_cnt;
1225         }
1226
1227         for (p = s; p <= e; ++p) {
1228                 dev = ipoib_add_port("ib%d", device, p);
1229                 if (!IS_ERR(dev)) {
1230                         priv = netdev_priv(dev);
1231                         list_add_tail(&priv->list, dev_list);
1232                 }
1233         }
1234
1235         ib_set_client_data(device, &ipoib_client, dev_list);
1236 }
1237
1238 static void ipoib_remove_one(struct ib_device *device)
1239 {
1240         struct ipoib_dev_priv *priv, *tmp;
1241         struct list_head *dev_list;
1242
1243         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1244                 return;
1245
1246         dev_list = ib_get_client_data(device, &ipoib_client);
1247
1248         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1249                 ib_unregister_event_handler(&priv->event_handler);
1250                 flush_scheduled_work();
1251
1252                 unregister_netdev(priv->dev);
1253                 ipoib_dev_cleanup(priv->dev);
1254                 free_netdev(priv->dev);
1255         }
1256
1257         kfree(dev_list);
1258 }
1259
1260 static int __init ipoib_init_module(void)
1261 {
1262         int ret;
1263
1264         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1265         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1266         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1267
1268         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1269         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1270         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1271
1272         ret = ipoib_register_debugfs();
1273         if (ret)
1274                 return ret;
1275
1276         /*
1277          * We create our own workqueue mainly because we want to be
1278          * able to flush it when devices are being removed.  We can't
1279          * use schedule_work()/flush_scheduled_work() because both
1280          * unregister_netdev() and linkwatch_event take the rtnl lock,
1281          * so flush_scheduled_work() can deadlock during device
1282          * removal.
1283          */
1284         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1285         if (!ipoib_workqueue) {
1286                 ret = -ENOMEM;
1287                 goto err_fs;
1288         }
1289
1290         ib_sa_register_client(&ipoib_sa_client);
1291
1292         ret = ib_register_client(&ipoib_client);
1293         if (ret)
1294                 goto err_sa;
1295
1296         return 0;
1297
1298 err_sa:
1299         ib_sa_unregister_client(&ipoib_sa_client);
1300         destroy_workqueue(ipoib_workqueue);
1301
1302 err_fs:
1303         ipoib_unregister_debugfs();
1304
1305         return ret;
1306 }
1307
1308 static void __exit ipoib_cleanup_module(void)
1309 {
1310         ib_unregister_client(&ipoib_client);
1311         ib_sa_unregister_client(&ipoib_sa_client);
1312         ipoib_unregister_debugfs();
1313         destroy_workqueue(ipoib_workqueue);
1314 }
1315
1316 module_init(ipoib_init_module);
1317 module_exit(ipoib_cleanup_module);