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 #include <linux/vmalloc.h>
  45
  46 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  47
  48 #include <linux/ip.h>
  49 #include <linux/in.h>
  50
  51 #include <net/dst.h>
  52
  53 MODULE_AUTHOR("Roland Dreier");
  54 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  55 MODULE_LICENSE("Dual BSD/GPL");
  56
  57 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  58 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  59
  60 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  61 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  62 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  63 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  64
  65 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  66 int ipoib_debug_level;
  67
  68 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  69 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  70 #endif
  71
  72 struct ipoib_path_iter {
  73         struct net_device *dev;
  74         struct ipoib_path  path;
  75 };
  76
  77 static const u8 ipv4_bcast_addr[] = {
  78         0x00, 0xff, 0xff, 0xff,
  79         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  80         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  81 };
  82
  83 struct workqueue_struct *ipoib_workqueue;
  84
  85 struct ib_sa_client ipoib_sa_client;
  86
  87 static void ipoib_add_one(struct ib_device *device);
  88 static void ipoib_remove_one(struct ib_device *device);
  89
  90 static struct ib_client ipoib_client = {
  91         .name   = "ipoib",
  92         .add    = ipoib_add_one,
  93         .remove = ipoib_remove_one
  94 };
  95
  96 int ipoib_open(struct net_device *dev)
  97 {
  98         struct ipoib_dev_priv *priv = netdev_priv(dev);
  99
 100         ipoib_dbg(priv, "bringing up interface\n");
 101
 102         napi_enable(&priv->napi);
 103         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 104
 105         if (ipoib_pkey_dev_delay_open(dev))
 106                 return 0;
 107
 108         if (ipoib_ib_dev_open(dev)) {
 109                 napi_disable(&priv->napi);
 110                 return -EINVAL;
 111         }
 112
 113         if (ipoib_ib_dev_up(dev)) {
 114                 ipoib_ib_dev_stop(dev, 1);
 115                 napi_disable(&priv->napi);
 116                 return -EINVAL;
 117         }
 118
 119         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 120                 struct ipoib_dev_priv *cpriv;
 121
 122                 /* Bring up any child interfaces too */
 123                 mutex_lock(&priv->vlan_mutex);
 124                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 125                         int flags;
 126
 127                         flags = cpriv->dev->flags;
 128                         if (flags & IFF_UP)
 129                                 continue;
 130
 131                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 132                 }
 133                 mutex_unlock(&priv->vlan_mutex);
 134         }
 135
 136         netif_start_queue(dev);
 137
 138         return 0;
 139 }
 140
 141 static int ipoib_stop(struct net_device *dev)
 142 {
 143         struct ipoib_dev_priv *priv = netdev_priv(dev);
 144
 145         ipoib_dbg(priv, "stopping interface\n");
 146
 147         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 148         napi_disable(&priv->napi);
 149
 150         netif_stop_queue(dev);
 151
 152         /*
 153          * Now flush workqueue to make sure a scheduled task doesn't
 154          * bring our internal state back up.
 155          */
 156         flush_workqueue(ipoib_workqueue);
 157
 158         ipoib_ib_dev_down(dev, 1);
 159         ipoib_ib_dev_stop(dev, 1);
 160
 161         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 162                 struct ipoib_dev_priv *cpriv;
 163
 164                 /* Bring down any child interfaces too */
 165                 mutex_lock(&priv->vlan_mutex);
 166                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 167                         int flags;
 168
 169                         flags = cpriv->dev->flags;
 170                         if (!(flags & IFF_UP))
 171                                 continue;
 172
 173                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 174                 }
 175                 mutex_unlock(&priv->vlan_mutex);
 176         }
 177
 178         return 0;
 179 }
 180
 181 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 182 {
 183         struct ipoib_dev_priv *priv = netdev_priv(dev);
 184
 185         /* dev->mtu > 2K ==> connected mode */
 186         if (ipoib_cm_admin_enabled(dev)) {
 187                 if (new_mtu > ipoib_cm_max_mtu(dev))
 188                         return -EINVAL;
 189
 190                 if (new_mtu > priv->mcast_mtu)
 191                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 192                                    priv->mcast_mtu);
 193
 194                 dev->mtu = new_mtu;
 195                 return 0;
 196         }
 197
 198         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
 199                 return -EINVAL;
 200
 201         priv->admin_mtu = new_mtu;
 202
 203         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 204
 205         return 0;
 206 }
 207
 208 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 209 {
 210         struct ipoib_dev_priv *priv = netdev_priv(dev);
 211         struct rb_node *n = priv->path_tree.rb_node;
 212         struct ipoib_path *path;
 213         int ret;
 214
 215         while (n) {
 216                 path = rb_entry(n, struct ipoib_path, rb_node);
 217
 218                 ret = memcmp(gid, path->pathrec.dgid.raw,
 219                              sizeof (union ib_gid));
 220
 221                 if (ret < 0)
 222                         n = n->rb_left;
 223                 else if (ret > 0)
 224                         n = n->rb_right;
 225                 else
 226                         return path;
 227         }
 228
 229         return NULL;
 230 }
 231
 232 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 233 {
 234         struct ipoib_dev_priv *priv = netdev_priv(dev);
 235         struct rb_node **n = &priv->path_tree.rb_node;
 236         struct rb_node *pn = NULL;
 237         struct ipoib_path *tpath;
 238         int ret;
 239
 240         while (*n) {
 241                 pn = *n;
 242                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 243
 244                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 245                              sizeof (union ib_gid));
 246                 if (ret < 0)
 247                         n = &pn->rb_left;
 248                 else if (ret > 0)
 249                         n = &pn->rb_right;
 250                 else
 251                         return -EEXIST;
 252         }
 253
 254         rb_link_node(&path->rb_node, pn, n);
 255         rb_insert_color(&path->rb_node, &priv->path_tree);
 256
 257         list_add_tail(&path->list, &priv->path_list);
 258
 259         return 0;
 260 }
 261
 262 static void path_free(struct net_device *dev, struct ipoib_path *path)
 263 {
 264         struct ipoib_dev_priv *priv = netdev_priv(dev);
 265         struct ipoib_neigh *neigh, *tn;
 266         struct sk_buff *skb;
 267         unsigned long flags;
 268
 269         while ((skb = __skb_dequeue(&path->queue)))
 270                 dev_kfree_skb_irq(skb);
 271
 272         spin_lock_irqsave(&priv->lock, flags);
 273
 274         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 275                 /*
 276                  * It's safe to call ipoib_put_ah() inside priv->lock
 277                  * here, because we know that path->ah will always
 278                  * hold one more reference, so ipoib_put_ah() will
 279                  * never do more than decrement the ref count.
 280                  */
 281                 if (neigh->ah)
 282                         ipoib_put_ah(neigh->ah);
 283
 284                 ipoib_neigh_free(dev, neigh);
 285         }
 286
 287         spin_unlock_irqrestore(&priv->lock, flags);
 288
 289         if (path->ah)
 290                 ipoib_put_ah(path->ah);
 291
 292         kfree(path);
 293 }
 294
 295 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 296
 297 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 298 {
 299         struct ipoib_path_iter *iter;
 300
 301         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 302         if (!iter)
 303                 return NULL;
 304
 305         iter->dev = dev;
 306         memset(iter->path.pathrec.dgid.raw, 0, 16);
 307
 308         if (ipoib_path_iter_next(iter)) {
 309                 kfree(iter);
 310                 return NULL;
 311         }
 312
 313         return iter;
 314 }
 315
 316 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 317 {
 318         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 319         struct rb_node *n;
 320         struct ipoib_path *path;
 321         int ret = 1;
 322
 323         spin_lock_irq(&priv->lock);
 324
 325         n = rb_first(&priv->path_tree);
 326
 327         while (n) {
 328                 path = rb_entry(n, struct ipoib_path, rb_node);
 329
 330                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 331                            sizeof (union ib_gid)) < 0) {
 332                         iter->path = *path;
 333                         ret = 0;
 334                         break;
 335                 }
 336
 337                 n = rb_next(n);
 338         }
 339
 340         spin_unlock_irq(&priv->lock);
 341
 342         return ret;
 343 }
 344
 345 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 346                           struct ipoib_path *path)
 347 {
 348         *path = iter->path;
 349 }
 350
 351 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 352
 353 void ipoib_flush_paths(struct net_device *dev)
 354 {
 355         struct ipoib_dev_priv *priv = netdev_priv(dev);
 356         struct ipoib_path *path, *tp;
 357         LIST_HEAD(remove_list);
 358
 359         spin_lock_irq(&priv->tx_lock);
 360         spin_lock(&priv->lock);
 361
 362         list_splice_init(&priv->path_list, &remove_list);
 363
 364         list_for_each_entry(path, &remove_list, list)
 365                 rb_erase(&path->rb_node, &priv->path_tree);
 366
 367         list_for_each_entry_safe(path, tp, &remove_list, list) {
 368                 if (path->query)
 369                         ib_sa_cancel_query(path->query_id, path->query);
 370                 spin_unlock(&priv->lock);
 371                 spin_unlock_irq(&priv->tx_lock);
 372                 wait_for_completion(&path->done);
 373                 path_free(dev, path);
 374                 spin_lock_irq(&priv->tx_lock);
 375                 spin_lock(&priv->lock);
 376         }
 377         spin_unlock(&priv->lock);
 378         spin_unlock_irq(&priv->tx_lock);
 379 }
 380
 381 static void path_rec_completion(int status,
 382                                 struct ib_sa_path_rec *pathrec,
 383                                 void *path_ptr)
 384 {
 385         struct ipoib_path *path = path_ptr;
 386         struct net_device *dev = path->dev;
 387         struct ipoib_dev_priv *priv = netdev_priv(dev);
 388         struct ipoib_ah *ah = NULL;
 389         struct ipoib_neigh *neigh, *tn;
 390         struct sk_buff_head skqueue;
 391         struct sk_buff *skb;
 392         unsigned long flags;
 393
 394         if (!status)
 395                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 396                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 397         else
 398                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 399                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 400
 401         skb_queue_head_init(&skqueue);
 402
 403         if (!status) {
 404                 struct ib_ah_attr av;
 405
 406                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 407                         ah = ipoib_create_ah(dev, priv->pd, &av);
 408         }
 409
 410         spin_lock_irqsave(&priv->lock, flags);
 411
 412         path->ah = ah;
 413
 414         if (ah) {
 415                 path->pathrec = *pathrec;
 416
 417                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 418                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 419
 420                 while ((skb = __skb_dequeue(&path->queue)))
 421                         __skb_queue_tail(&skqueue, skb);
 422
 423                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 424                         kref_get(&path->ah->ref);
 425                         neigh->ah = path->ah;
 426                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 427                                sizeof(union ib_gid));
 428
 429                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 430                                 if (!ipoib_cm_get(neigh))
 431                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 432                                                                                path,
 433                                                                                neigh));
 434                                 if (!ipoib_cm_get(neigh)) {
 435                                         list_del(&neigh->list);
 436                                         if (neigh->ah)
 437                                                 ipoib_put_ah(neigh->ah);
 438                                         ipoib_neigh_free(dev, neigh);
 439                                         continue;
 440                                 }
 441                         }
 442
 443                         while ((skb = __skb_dequeue(&neigh->queue)))
 444                                 __skb_queue_tail(&skqueue, skb);
 445                 }
 446         }
 447
 448         path->query = NULL;
 449         complete(&path->done);
 450
 451         spin_unlock_irqrestore(&priv->lock, flags);
 452
 453         while ((skb = __skb_dequeue(&skqueue))) {
 454                 skb->dev = dev;
 455                 if (dev_queue_xmit(skb))
 456                         ipoib_warn(priv, "dev_queue_xmit failed "
 457                                    "to requeue packet\n");
 458         }
 459 }
 460
 461 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 462 {
 463         struct ipoib_dev_priv *priv = netdev_priv(dev);
 464         struct ipoib_path *path;
 465
 466         if (!priv->broadcast)
 467                 return NULL;
 468
 469         path = kzalloc(sizeof *path, GFP_ATOMIC);
 470         if (!path)
 471                 return NULL;
 472
 473         path->dev = dev;
 474
 475         skb_queue_head_init(&path->queue);
 476
 477         INIT_LIST_HEAD(&path->neigh_list);
 478
 479         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 480         path->pathrec.sgid          = priv->local_gid;
 481         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 482         path->pathrec.numb_path     = 1;
 483         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 484
 485         return path;
 486 }
 487
 488 static int path_rec_start(struct net_device *dev,
 489                           struct ipoib_path *path)
 490 {
 491         struct ipoib_dev_priv *priv = netdev_priv(dev);
 492
 493         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 494                   IPOIB_GID_ARG(path->pathrec.dgid));
 495
 496         init_completion(&path->done);
 497
 498         path->query_id =
 499                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 500                                    &path->pathrec,
 501                                    IB_SA_PATH_REC_DGID          |
 502                                    IB_SA_PATH_REC_SGID          |
 503                                    IB_SA_PATH_REC_NUMB_PATH     |
 504                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 505                                    IB_SA_PATH_REC_PKEY,
 506                                    1000, GFP_ATOMIC,
 507                                    path_rec_completion,
 508                                    path, &path->query);
 509         if (path->query_id < 0) {
 510                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 511                 path->query = NULL;
 512                 return path->query_id;
 513         }
 514
 515         return 0;
 516 }
 517
 518 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 519 {
 520         struct ipoib_dev_priv *priv = netdev_priv(dev);
 521         struct ipoib_path *path;
 522         struct ipoib_neigh *neigh;
 523
 524         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 525         if (!neigh) {
 526                 ++dev->stats.tx_dropped;
 527                 dev_kfree_skb_any(skb);
 528                 return;
 529         }
 530
 531         /*
 532          * We can only be called from ipoib_start_xmit, so we're
 533          * inside tx_lock -- no need to save/restore flags.
 534          */
 535         spin_lock(&priv->lock);
 536
 537         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 538         if (!path) {
 539                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 540                 if (!path)
 541                         goto err_path;
 542
 543                 __path_add(dev, path);
 544         }
 545
 546         list_add_tail(&neigh->list, &path->neigh_list);
 547
 548         if (path->ah) {
 549                 kref_get(&path->ah->ref);
 550                 neigh->ah = path->ah;
 551                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 552                        sizeof(union ib_gid));
 553
 554                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 555                         if (!ipoib_cm_get(neigh))
 556                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 557                         if (!ipoib_cm_get(neigh)) {
 558                                 list_del(&neigh->list);
 559                                 if (neigh->ah)
 560                                         ipoib_put_ah(neigh->ah);
 561                                 ipoib_neigh_free(dev, neigh);
 562                                 goto err_drop;
 563                         }
 564                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 565                                 __skb_queue_tail(&neigh->queue, skb);
 566                         else {
 567                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 568                                            skb_queue_len(&neigh->queue));
 569                                 goto err_drop;
 570                         }
 571                 } else
 572                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 573         } else {
 574                 neigh->ah  = NULL;
 575
 576                 if (!path->query && path_rec_start(dev, path))
 577                         goto err_list;
 578
 579                 __skb_queue_tail(&neigh->queue, skb);
 580         }
 581
 582         spin_unlock(&priv->lock);
 583         return;
 584
 585 err_list:
 586         list_del(&neigh->list);
 587
 588 err_path:
 589         ipoib_neigh_free(dev, neigh);
 590 err_drop:
 591         ++dev->stats.tx_dropped;
 592         dev_kfree_skb_any(skb);
 593
 594         spin_unlock(&priv->lock);
 595 }
 596
 597 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 598 {
 599         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 600
 601         /* Look up path record for unicasts */
 602         if (skb->dst->neighbour->ha[4] != 0xff) {
 603                 neigh_add_path(skb, dev);
 604                 return;
 605         }
 606
 607         /* Add in the P_Key for multicasts */
 608         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 609         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 610         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 611 }
 612
 613 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 614                              struct ipoib_pseudoheader *phdr)
 615 {
 616         struct ipoib_dev_priv *priv = netdev_priv(dev);
 617         struct ipoib_path *path;
 618
 619         /*
 620          * We can only be called from ipoib_start_xmit, so we're
 621          * inside tx_lock -- no need to save/restore flags.
 622          */
 623         spin_lock(&priv->lock);
 624
 625         path = __path_find(dev, phdr->hwaddr + 4);
 626         if (!path) {
 627                 path = path_rec_create(dev, phdr->hwaddr + 4);
 628                 if (path) {
 629                         /* put pseudoheader back on for next time */
 630                         skb_push(skb, sizeof *phdr);
 631                         __skb_queue_tail(&path->queue, skb);
 632
 633                         if (path_rec_start(dev, path)) {
 634                                 spin_unlock(&priv->lock);
 635                                 path_free(dev, path);
 636                                 return;
 637                         } else
 638                                 __path_add(dev, path);
 639                 } else {
 640                         ++dev->stats.tx_dropped;
 641                         dev_kfree_skb_any(skb);
 642                 }
 643
 644                 spin_unlock(&priv->lock);
 645                 return;
 646         }
 647
 648         if (path->ah) {
 649                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 650                           be16_to_cpu(path->pathrec.dlid));
 651
 652                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 653         } else if ((path->query || !path_rec_start(dev, path)) &&
 654                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 655                 /* put pseudoheader back on for next time */
 656                 skb_push(skb, sizeof *phdr);
 657                 __skb_queue_tail(&path->queue, skb);
 658         } else {
 659                 ++dev->stats.tx_dropped;
 660                 dev_kfree_skb_any(skb);
 661         }
 662
 663         spin_unlock(&priv->lock);
 664 }
 665
 666 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 667 {
 668         struct ipoib_dev_priv *priv = netdev_priv(dev);
 669         struct ipoib_neigh *neigh;
 670         unsigned long flags;
 671
 672         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 673                 return NETDEV_TX_LOCKED;
 674
 675         if (likely(skb->dst && skb->dst->neighbour)) {
 676                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 677                         ipoib_path_lookup(skb, dev);
 678                         goto out;
 679                 }
 680
 681                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 682
 683                 if (neigh->ah)
 684                         if (unlikely((memcmp(&neigh->dgid.raw,
 685                                             skb->dst->neighbour->ha + 4,
 686                                             sizeof(union ib_gid))) ||
 687                                          (neigh->dev != dev))) {
 688                                 spin_lock(&priv->lock);
 689                                 /*
 690                                  * It's safe to call ipoib_put_ah() inside
 691                                  * priv->lock here, because we know that
 692                                  * path->ah will always hold one more reference,
 693                                  * so ipoib_put_ah() will never do more than
 694                                  * decrement the ref count.
 695                                  */
 696                                 ipoib_put_ah(neigh->ah);
 697                                 list_del(&neigh->list);
 698                                 ipoib_neigh_free(dev, neigh);
 699                                 spin_unlock(&priv->lock);
 700                                 ipoib_path_lookup(skb, dev);
 701                                 goto out;
 702                         }
 703
 704                 if (ipoib_cm_get(neigh)) {
 705                         if (ipoib_cm_up(neigh)) {
 706                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 707                                 goto out;
 708                         }
 709                 } else if (neigh->ah) {
 710                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 711                         goto out;
 712                 }
 713
 714                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 715                         spin_lock(&priv->lock);
 716                         __skb_queue_tail(&neigh->queue, skb);
 717                         spin_unlock(&priv->lock);
 718                 } else {
 719                         ++dev->stats.tx_dropped;
 720                         dev_kfree_skb_any(skb);
 721                 }
 722         } else {
 723                 struct ipoib_pseudoheader *phdr =
 724                         (struct ipoib_pseudoheader *) skb->data;
 725                 skb_pull(skb, sizeof *phdr);
 726
 727                 if (phdr->hwaddr[4] == 0xff) {
 728                         /* Add in the P_Key for multicast*/
 729                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 730                         phdr->hwaddr[9] = priv->pkey & 0xff;
 731
 732                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 733                 } else {
 734                         /* unicast GID -- should be ARP or RARP reply */
 735
 736                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 737                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 738                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 739                                            IPOIB_GID_FMT "\n",
 740                                            skb->dst ? "neigh" : "dst",
 741                                            be16_to_cpup((__be16 *) skb->data),
 742                                            IPOIB_QPN(phdr->hwaddr),
 743                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 744                                 dev_kfree_skb_any(skb);
 745                                 ++dev->stats.tx_dropped;
 746                                 goto out;
 747                         }
 748
 749                         unicast_arp_send(skb, dev, phdr);
 750                 }
 751         }
 752
 753 out:
 754         spin_unlock_irqrestore(&priv->tx_lock, flags);
 755
 756         return NETDEV_TX_OK;
 757 }
 758
 759 static void ipoib_timeout(struct net_device *dev)
 760 {
 761         struct ipoib_dev_priv *priv = netdev_priv(dev);
 762
 763         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 764                    jiffies_to_msecs(jiffies - dev->trans_start));
 765         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 766                    netif_queue_stopped(dev),
 767                    priv->tx_head, priv->tx_tail);
 768         /* XXX reset QP, etc. */
 769 }
 770
 771 static int ipoib_hard_header(struct sk_buff *skb,
 772                              struct net_device *dev,
 773                              unsigned short type,
 774                              const void *daddr, const void *saddr, unsigned len)
 775 {
 776         struct ipoib_header *header;
 777
 778         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 779
 780         header->proto = htons(type);
 781         header->reserved = 0;
 782
 783         /*
 784          * If we don't have a neighbour structure, stuff the
 785          * destination address onto the front of the skb so we can
 786          * figure out where to send the packet later.
 787          */
 788         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 789                 struct ipoib_pseudoheader *phdr =
 790                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 791                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 792         }
 793
 794         return 0;
 795 }
 796
 797 static void ipoib_set_mcast_list(struct net_device *dev)
 798 {
 799         struct ipoib_dev_priv *priv = netdev_priv(dev);
 800
 801         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 802                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 803                 return;
 804         }
 805
 806         queue_work(ipoib_workqueue, &priv->restart_task);
 807 }
 808
 809 static void ipoib_neigh_cleanup(struct neighbour *n)
 810 {
 811         struct ipoib_neigh *neigh;
 812         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 813         unsigned long flags;
 814         struct ipoib_ah *ah = NULL;
 815
 816         neigh = *to_ipoib_neigh(n);
 817         if (neigh)
 818                 priv = netdev_priv(neigh->dev);
 819         else
 820                 return;
 821         ipoib_dbg(priv,
 822                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 823                   IPOIB_QPN(n->ha),
 824                   IPOIB_GID_RAW_ARG(n->ha + 4));
 825
 826         spin_lock_irqsave(&priv->lock, flags);
 827
 828         if (neigh->ah)
 829                 ah = neigh->ah;
 830         list_del(&neigh->list);
 831         ipoib_neigh_free(n->dev, neigh);
 832
 833         spin_unlock_irqrestore(&priv->lock, flags);
 834
 835         if (ah)
 836                 ipoib_put_ah(ah);
 837 }
 838
 839 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 840                                       struct net_device *dev)
 841 {
 842         struct ipoib_neigh *neigh;
 843
 844         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 845         if (!neigh)
 846                 return NULL;
 847
 848         neigh->neighbour = neighbour;
 849         neigh->dev = dev;
 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 = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
 891         if (!priv->tx_ring) {
 892                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 893                        ca->name, ipoib_sendq_size);
 894                 goto out_rx_ring_cleanup;
 895         }
 896         memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
 897
 898         /* priv->tx_head, tx_tail & tx_outstanding 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         vfree(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         vfree(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     |
 969                                     NETIF_F_LLTX                |
 970                                     NETIF_F_HIGHDMA);
 971
 972         /* MTU will be reset when mcast join happens */
 973         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 974         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 975
 976         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 977
 978         netif_carrier_off(dev);
 979
 980         priv->dev = dev;
 981
 982         spin_lock_init(&priv->lock);
 983         spin_lock_init(&priv->tx_lock);
 984
 985         mutex_init(&priv->mcast_mutex);
 986         mutex_init(&priv->vlan_mutex);
 987
 988         INIT_LIST_HEAD(&priv->path_list);
 989         INIT_LIST_HEAD(&priv->child_intfs);
 990         INIT_LIST_HEAD(&priv->dead_ahs);
 991         INIT_LIST_HEAD(&priv->multicast_list);
 992
 993         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
 994         INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
 995         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 996         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
 997         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
 998         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
 999 }
1000
1001 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1002 {
1003         struct net_device *dev;
1004
1005         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1006                            ipoib_setup);
1007         if (!dev)
1008                 return NULL;
1009
1010         return netdev_priv(dev);
1011 }
1012
1013 static ssize_t show_pkey(struct device *dev,
1014                          struct device_attribute *attr, char *buf)
1015 {
1016         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1017
1018         return sprintf(buf, "0x%04x\n", priv->pkey);
1019 }
1020 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1021
1022 static ssize_t show_umcast(struct device *dev,
1023                            struct device_attribute *attr, char *buf)
1024 {
1025         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1026
1027         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1028 }
1029
1030 static ssize_t set_umcast(struct device *dev,
1031                           struct device_attribute *attr,
1032                           const char *buf, size_t count)
1033 {
1034         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1035         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1036
1037         if (umcast_val > 0) {
1038                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1039                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1040                                 "by userspace\n");
1041         } else
1042                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1043
1044         return count;
1045 }
1046 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1047
1048 int ipoib_add_umcast_attr(struct net_device *dev)
1049 {
1050         return device_create_file(&dev->dev, &dev_attr_umcast);
1051 }
1052
1053 static ssize_t create_child(struct device *dev,
1054                             struct device_attribute *attr,
1055                             const char *buf, size_t count)
1056 {
1057         int pkey;
1058         int ret;
1059
1060         if (sscanf(buf, "%i", &pkey) != 1)
1061                 return -EINVAL;
1062
1063         if (pkey < 0 || pkey > 0xffff)
1064                 return -EINVAL;
1065
1066         /*
1067          * Set the full membership bit, so that we join the right
1068          * broadcast group, etc.
1069          */
1070         pkey |= 0x8000;
1071
1072         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1073
1074         return ret ? ret : count;
1075 }
1076 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1077
1078 static ssize_t delete_child(struct device *dev,
1079                             struct device_attribute *attr,
1080                             const char *buf, size_t count)
1081 {
1082         int pkey;
1083         int ret;
1084
1085         if (sscanf(buf, "%i", &pkey) != 1)
1086                 return -EINVAL;
1087
1088         if (pkey < 0 || pkey > 0xffff)
1089                 return -EINVAL;
1090
1091         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1092
1093         return ret ? ret : count;
1094
1095 }
1096 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1097
1098 int ipoib_add_pkey_attr(struct net_device *dev)
1099 {
1100         return device_create_file(&dev->dev, &dev_attr_pkey);
1101 }
1102
1103 static struct net_device *ipoib_add_port(const char *format,
1104                                          struct ib_device *hca, u8 port)
1105 {
1106         struct ipoib_dev_priv *priv;
1107         struct ib_device_attr *device_attr;
1108         int result = -ENOMEM;
1109
1110         priv = ipoib_intf_alloc(format);
1111         if (!priv)
1112                 goto alloc_mem_failed;
1113
1114         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1115
1116         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1117         if (result) {
1118                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1119                        hca->name, port, result);
1120                 goto device_init_failed;
1121         }
1122
1123         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1124         if (!device_attr) {
1125                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1126                        hca->name, sizeof *device_attr);
1127                 goto device_init_failed;
1128         }
1129
1130         result = ib_query_device(hca, device_attr);
1131         if (result) {
1132                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1133                        hca->name, result);
1134                 kfree(device_attr);
1135                 goto device_init_failed;
1136         }
1137
1138         if (device_attr->device_cap_flags & IB_DEVICE_UD_IP_CSUM) {
1139                 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1140                 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1141         }
1142
1143         kfree(device_attr);
1144
1145         /*
1146          * Set the full membership bit, so that we join the right
1147          * broadcast group, etc.
1148          */
1149         priv->pkey |= 0x8000;
1150
1151         priv->dev->broadcast[8] = priv->pkey >> 8;
1152         priv->dev->broadcast[9] = priv->pkey & 0xff;
1153
1154         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1155         if (result) {
1156                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1157                        hca->name, port, result);
1158                 goto device_init_failed;
1159         } else
1160                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1161
1162         result = ipoib_dev_init(priv->dev, hca, port);
1163         if (result < 0) {
1164                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1165                        hca->name, port, result);
1166                 goto device_init_failed;
1167         }
1168
1169         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1170                               priv->ca, ipoib_event);
1171         result = ib_register_event_handler(&priv->event_handler);
1172         if (result < 0) {
1173                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1174                        "port %d (ret = %d)\n",
1175                        hca->name, port, result);
1176                 goto event_failed;
1177         }
1178
1179         result = register_netdev(priv->dev);
1180         if (result) {
1181                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1182                        hca->name, port, result);
1183                 goto register_failed;
1184         }
1185
1186         ipoib_create_debug_files(priv->dev);
1187
1188         if (ipoib_cm_add_mode_attr(priv->dev))
1189                 goto sysfs_failed;
1190         if (ipoib_add_pkey_attr(priv->dev))
1191                 goto sysfs_failed;
1192         if (ipoib_add_umcast_attr(priv->dev))
1193                 goto sysfs_failed;
1194         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1195                 goto sysfs_failed;
1196         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1197                 goto sysfs_failed;
1198
1199         return priv->dev;
1200
1201 sysfs_failed:
1202         ipoib_delete_debug_files(priv->dev);
1203         unregister_netdev(priv->dev);
1204
1205 register_failed:
1206         ib_unregister_event_handler(&priv->event_handler);
1207         flush_scheduled_work();
1208
1209 event_failed:
1210         ipoib_dev_cleanup(priv->dev);
1211
1212 device_init_failed:
1213         free_netdev(priv->dev);
1214
1215 alloc_mem_failed:
1216         return ERR_PTR(result);
1217 }
1218
1219 static void ipoib_add_one(struct ib_device *device)
1220 {
1221         struct list_head *dev_list;
1222         struct net_device *dev;
1223         struct ipoib_dev_priv *priv;
1224         int s, e, p;
1225
1226         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1227                 return;
1228
1229         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1230         if (!dev_list)
1231                 return;
1232
1233         INIT_LIST_HEAD(dev_list);
1234
1235         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1236                 s = 0;
1237                 e = 0;
1238         } else {
1239                 s = 1;
1240                 e = device->phys_port_cnt;
1241         }
1242
1243         for (p = s; p <= e; ++p) {
1244                 dev = ipoib_add_port("ib%d", device, p);
1245                 if (!IS_ERR(dev)) {
1246                         priv = netdev_priv(dev);
1247                         list_add_tail(&priv->list, dev_list);
1248                 }
1249         }
1250
1251         ib_set_client_data(device, &ipoib_client, dev_list);
1252 }
1253
1254 static void ipoib_remove_one(struct ib_device *device)
1255 {
1256         struct ipoib_dev_priv *priv, *tmp;
1257         struct list_head *dev_list;
1258
1259         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1260                 return;
1261
1262         dev_list = ib_get_client_data(device, &ipoib_client);
1263
1264         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1265                 ib_unregister_event_handler(&priv->event_handler);
1266                 flush_scheduled_work();
1267
1268                 unregister_netdev(priv->dev);
1269                 ipoib_dev_cleanup(priv->dev);
1270                 free_netdev(priv->dev);
1271         }
1272
1273         kfree(dev_list);
1274 }
1275
1276 static int __init ipoib_init_module(void)
1277 {
1278         int ret;
1279
1280         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1281         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1282         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1283
1284         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1285         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1286         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1287 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1288         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1289 #endif
1290
1291         ret = ipoib_register_debugfs();
1292         if (ret)
1293                 return ret;
1294
1295         /*
1296          * We create our own workqueue mainly because we want to be
1297          * able to flush it when devices are being removed.  We can't
1298          * use schedule_work()/flush_scheduled_work() because both
1299          * unregister_netdev() and linkwatch_event take the rtnl lock,
1300          * so flush_scheduled_work() can deadlock during device
1301          * removal.
1302          */
1303         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1304         if (!ipoib_workqueue) {
1305                 ret = -ENOMEM;
1306                 goto err_fs;
1307         }
1308
1309         ib_sa_register_client(&ipoib_sa_client);
1310
1311         ret = ib_register_client(&ipoib_client);
1312         if (ret)
1313                 goto err_sa;
1314
1315         return 0;
1316
1317 err_sa:
1318         ib_sa_unregister_client(&ipoib_sa_client);
1319         destroy_workqueue(ipoib_workqueue);
1320
1321 err_fs:
1322         ipoib_unregister_debugfs();
1323
1324         return ret;
1325 }
1326
1327 static void __exit ipoib_cleanup_module(void)
1328 {
1329         ib_unregister_client(&ipoib_client);
1330         ib_sa_unregister_client(&ipoib_sa_client);
1331         ipoib_unregister_debugfs();
1332         destroy_workqueue(ipoib_workqueue);
1333 }
1334
1335 module_init(ipoib_init_module);
1336 module_exit(ipoib_cleanup_module);