git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/ulp/ipoib/ipoib_main.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
  35  */
  36
  37 #include "ipoib.h"
  38
  39 #include <linux/module.h>
  40
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/kernel.h>
  44 #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(&priv->path_list, &remove_list);
 363         INIT_LIST_HEAD(&priv->path_list);
 364
 365         list_for_each_entry(path, &remove_list, list)
 366                 rb_erase(&path->rb_node, &priv->path_tree);
 367
 368         list_for_each_entry_safe(path, tp, &remove_list, list) {
 369                 if (path->query)
 370                         ib_sa_cancel_query(path->query_id, path->query);
 371                 spin_unlock(&priv->lock);
 372                 spin_unlock_irq(&priv->tx_lock);
 373                 wait_for_completion(&path->done);
 374                 path_free(dev, path);
 375                 spin_lock_irq(&priv->tx_lock);
 376                 spin_lock(&priv->lock);
 377         }
 378         spin_unlock(&priv->lock);
 379         spin_unlock_irq(&priv->tx_lock);
 380 }
 381
 382 static void path_rec_completion(int status,
 383                                 struct ib_sa_path_rec *pathrec,
 384                                 void *path_ptr)
 385 {
 386         struct ipoib_path *path = path_ptr;
 387         struct net_device *dev = path->dev;
 388         struct ipoib_dev_priv *priv = netdev_priv(dev);
 389         struct ipoib_ah *ah = NULL;
 390         struct ipoib_neigh *neigh, *tn;
 391         struct sk_buff_head skqueue;
 392         struct sk_buff *skb;
 393         unsigned long flags;
 394
 395         if (!status)
 396                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 397                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 398         else
 399                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 400                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 401
 402         skb_queue_head_init(&skqueue);
 403
 404         if (!status) {
 405                 struct ib_ah_attr av;
 406
 407                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 408                         ah = ipoib_create_ah(dev, priv->pd, &av);
 409         }
 410
 411         spin_lock_irqsave(&priv->lock, flags);
 412
 413         path->ah = ah;
 414
 415         if (ah) {
 416                 path->pathrec = *pathrec;
 417
 418                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 419                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 420
 421                 while ((skb = __skb_dequeue(&path->queue)))
 422                         __skb_queue_tail(&skqueue, skb);
 423
 424                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 425                         kref_get(&path->ah->ref);
 426                         neigh->ah = path->ah;
 427                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 428                                sizeof(union ib_gid));
 429
 430                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 431                                 if (!ipoib_cm_get(neigh))
 432                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 433                                                                                path,
 434                                                                                neigh));
 435                                 if (!ipoib_cm_get(neigh)) {
 436                                         list_del(&neigh->list);
 437                                         if (neigh->ah)
 438                                                 ipoib_put_ah(neigh->ah);
 439                                         ipoib_neigh_free(dev, neigh);
 440                                         continue;
 441                                 }
 442                         }
 443
 444                         while ((skb = __skb_dequeue(&neigh->queue)))
 445                                 __skb_queue_tail(&skqueue, skb);
 446                 }
 447         }
 448
 449         path->query = NULL;
 450         complete(&path->done);
 451
 452         spin_unlock_irqrestore(&priv->lock, flags);
 453
 454         while ((skb = __skb_dequeue(&skqueue))) {
 455                 skb->dev = dev;
 456                 if (dev_queue_xmit(skb))
 457                         ipoib_warn(priv, "dev_queue_xmit failed "
 458                                    "to requeue packet\n");
 459         }
 460 }
 461
 462 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 463 {
 464         struct ipoib_dev_priv *priv = netdev_priv(dev);
 465         struct ipoib_path *path;
 466
 467         if (!priv->broadcast)
 468                 return NULL;
 469
 470         path = kzalloc(sizeof *path, GFP_ATOMIC);
 471         if (!path)
 472                 return NULL;
 473
 474         path->dev = dev;
 475
 476         skb_queue_head_init(&path->queue);
 477
 478         INIT_LIST_HEAD(&path->neigh_list);
 479
 480         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 481         path->pathrec.sgid          = priv->local_gid;
 482         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 483         path->pathrec.numb_path     = 1;
 484         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 485
 486         return path;
 487 }
 488
 489 static int path_rec_start(struct net_device *dev,
 490                           struct ipoib_path *path)
 491 {
 492         struct ipoib_dev_priv *priv = netdev_priv(dev);
 493
 494         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 495                   IPOIB_GID_ARG(path->pathrec.dgid));
 496
 497         init_completion(&path->done);
 498
 499         path->query_id =
 500                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 501                                    &path->pathrec,
 502                                    IB_SA_PATH_REC_DGID          |
 503                                    IB_SA_PATH_REC_SGID          |
 504                                    IB_SA_PATH_REC_NUMB_PATH     |
 505                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 506                                    IB_SA_PATH_REC_PKEY,
 507                                    1000, GFP_ATOMIC,
 508                                    path_rec_completion,
 509                                    path, &path->query);
 510         if (path->query_id < 0) {
 511                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 512                 path->query = NULL;
 513                 return path->query_id;
 514         }
 515
 516         return 0;
 517 }
 518
 519 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 520 {
 521         struct ipoib_dev_priv *priv = netdev_priv(dev);
 522         struct ipoib_path *path;
 523         struct ipoib_neigh *neigh;
 524
 525         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 526         if (!neigh) {
 527                 ++dev->stats.tx_dropped;
 528                 dev_kfree_skb_any(skb);
 529                 return;
 530         }
 531
 532         /*
 533          * We can only be called from ipoib_start_xmit, so we're
 534          * inside tx_lock -- no need to save/restore flags.
 535          */
 536         spin_lock(&priv->lock);
 537
 538         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 539         if (!path) {
 540                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 541                 if (!path)
 542                         goto err_path;
 543
 544                 __path_add(dev, path);
 545         }
 546
 547         list_add_tail(&neigh->list, &path->neigh_list);
 548
 549         if (path->ah) {
 550                 kref_get(&path->ah->ref);
 551                 neigh->ah = path->ah;
 552                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 553                        sizeof(union ib_gid));
 554
 555                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 556                         if (!ipoib_cm_get(neigh))
 557                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 558                         if (!ipoib_cm_get(neigh)) {
 559                                 list_del(&neigh->list);
 560                                 if (neigh->ah)
 561                                         ipoib_put_ah(neigh->ah);
 562                                 ipoib_neigh_free(dev, neigh);
 563                                 goto err_drop;
 564                         }
 565                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 566                                 __skb_queue_tail(&neigh->queue, skb);
 567                         else {
 568                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 569                                            skb_queue_len(&neigh->queue));
 570                                 goto err_drop;
 571                         }
 572                 } else
 573                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 574         } else {
 575                 neigh->ah  = NULL;
 576
 577                 if (!path->query && path_rec_start(dev, path))
 578                         goto err_list;
 579
 580                 __skb_queue_tail(&neigh->queue, skb);
 581         }
 582
 583         spin_unlock(&priv->lock);
 584         return;
 585
 586 err_list:
 587         list_del(&neigh->list);
 588
 589 err_path:
 590         ipoib_neigh_free(dev, neigh);
 591 err_drop:
 592         ++dev->stats.tx_dropped;
 593         dev_kfree_skb_any(skb);
 594
 595         spin_unlock(&priv->lock);
 596 }
 597
 598 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 599 {
 600         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 601
 602         /* Look up path record for unicasts */
 603         if (skb->dst->neighbour->ha[4] != 0xff) {
 604                 neigh_add_path(skb, dev);
 605                 return;
 606         }
 607
 608         /* Add in the P_Key for multicasts */
 609         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 610         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 611         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 612 }
 613
 614 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 615                              struct ipoib_pseudoheader *phdr)
 616 {
 617         struct ipoib_dev_priv *priv = netdev_priv(dev);
 618         struct ipoib_path *path;
 619
 620         /*
 621          * We can only be called from ipoib_start_xmit, so we're
 622          * inside tx_lock -- no need to save/restore flags.
 623          */
 624         spin_lock(&priv->lock);
 625
 626         path = __path_find(dev, phdr->hwaddr + 4);
 627         if (!path) {
 628                 path = path_rec_create(dev, phdr->hwaddr + 4);
 629                 if (path) {
 630                         /* put pseudoheader back on for next time */
 631                         skb_push(skb, sizeof *phdr);
 632                         __skb_queue_tail(&path->queue, skb);
 633
 634                         if (path_rec_start(dev, path)) {
 635                                 spin_unlock(&priv->lock);
 636                                 path_free(dev, path);
 637                                 return;
 638                         } else
 639                                 __path_add(dev, path);
 640                 } else {
 641                         ++dev->stats.tx_dropped;
 642                         dev_kfree_skb_any(skb);
 643                 }
 644
 645                 spin_unlock(&priv->lock);
 646                 return;
 647         }
 648
 649         if (path->ah) {
 650                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 651                           be16_to_cpu(path->pathrec.dlid));
 652
 653                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 654         } else if ((path->query || !path_rec_start(dev, path)) &&
 655                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 656                 /* put pseudoheader back on for next time */
 657                 skb_push(skb, sizeof *phdr);
 658                 __skb_queue_tail(&path->queue, skb);
 659         } else {
 660                 ++dev->stats.tx_dropped;
 661                 dev_kfree_skb_any(skb);
 662         }
 663
 664         spin_unlock(&priv->lock);
 665 }
 666
 667 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 668 {
 669         struct ipoib_dev_priv *priv = netdev_priv(dev);
 670         struct ipoib_neigh *neigh;
 671         unsigned long flags;
 672
 673         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 674                 return NETDEV_TX_LOCKED;
 675
 676         if (likely(skb->dst && skb->dst->neighbour)) {
 677                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 678                         ipoib_path_lookup(skb, dev);
 679                         goto out;
 680                 }
 681
 682                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 683
 684                 if (neigh->ah)
 685                         if (unlikely((memcmp(&neigh->dgid.raw,
 686                                             skb->dst->neighbour->ha + 4,
 687                                             sizeof(union ib_gid))) ||
 688                                          (neigh->dev != dev))) {
 689                                 spin_lock(&priv->lock);
 690                                 /*
 691                                  * It's safe to call ipoib_put_ah() inside
 692                                  * priv->lock here, because we know that
 693                                  * path->ah will always hold one more reference,
 694                                  * so ipoib_put_ah() will never do more than
 695                                  * decrement the ref count.
 696                                  */
 697                                 ipoib_put_ah(neigh->ah);
 698                                 list_del(&neigh->list);
 699                                 ipoib_neigh_free(dev, neigh);
 700                                 spin_unlock(&priv->lock);
 701                                 ipoib_path_lookup(skb, dev);
 702                                 goto out;
 703                         }
 704
 705                 if (ipoib_cm_get(neigh)) {
 706                         if (ipoib_cm_up(neigh)) {
 707                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 708                                 goto out;
 709                         }
 710                 } else if (neigh->ah) {
 711                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 712                         goto out;
 713                 }
 714
 715                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 716                         spin_lock(&priv->lock);
 717                         __skb_queue_tail(&neigh->queue, skb);
 718                         spin_unlock(&priv->lock);
 719                 } else {
 720                         ++dev->stats.tx_dropped;
 721                         dev_kfree_skb_any(skb);
 722                 }
 723         } else {
 724                 struct ipoib_pseudoheader *phdr =
 725                         (struct ipoib_pseudoheader *) skb->data;
 726                 skb_pull(skb, sizeof *phdr);
 727
 728                 if (phdr->hwaddr[4] == 0xff) {
 729                         /* Add in the P_Key for multicast*/
 730                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 731                         phdr->hwaddr[9] = priv->pkey & 0xff;
 732
 733                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 734                 } else {
 735                         /* unicast GID -- should be ARP or RARP reply */
 736
 737                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 738                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 739                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 740                                            IPOIB_GID_FMT "\n",
 741                                            skb->dst ? "neigh" : "dst",
 742                                            be16_to_cpup((__be16 *) skb->data),
 743                                            IPOIB_QPN(phdr->hwaddr),
 744                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 745                                 dev_kfree_skb_any(skb);
 746                                 ++dev->stats.tx_dropped;
 747                                 goto out;
 748                         }
 749
 750                         unicast_arp_send(skb, dev, phdr);
 751                 }
 752         }
 753
 754 out:
 755         spin_unlock_irqrestore(&priv->tx_lock, flags);
 756
 757         return NETDEV_TX_OK;
 758 }
 759
 760 static void ipoib_timeout(struct net_device *dev)
 761 {
 762         struct ipoib_dev_priv *priv = netdev_priv(dev);
 763
 764         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 765                    jiffies_to_msecs(jiffies - dev->trans_start));
 766         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 767                    netif_queue_stopped(dev),
 768                    priv->tx_head, priv->tx_tail);
 769         /* XXX reset QP, etc. */
 770 }
 771
 772 static int ipoib_hard_header(struct sk_buff *skb,
 773                              struct net_device *dev,
 774                              unsigned short type,
 775                              const void *daddr, const void *saddr, unsigned len)
 776 {
 777         struct ipoib_header *header;
 778
 779         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 780
 781         header->proto = htons(type);
 782         header->reserved = 0;
 783
 784         /*
 785          * If we don't have a neighbour structure, stuff the
 786          * destination address onto the front of the skb so we can
 787          * figure out where to send the packet later.
 788          */
 789         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 790                 struct ipoib_pseudoheader *phdr =
 791                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 792                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 793         }
 794
 795         return 0;
 796 }
 797
 798 static void ipoib_set_mcast_list(struct net_device *dev)
 799 {
 800         struct ipoib_dev_priv *priv = netdev_priv(dev);
 801
 802         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 803                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 804                 return;
 805         }
 806
 807         queue_work(ipoib_workqueue, &priv->restart_task);
 808 }
 809
 810 static void ipoib_neigh_cleanup(struct neighbour *n)
 811 {
 812         struct ipoib_neigh *neigh;
 813         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 814         unsigned long flags;
 815         struct ipoib_ah *ah = NULL;
 816
 817         neigh = *to_ipoib_neigh(n);
 818         if (neigh)
 819                 priv = netdev_priv(neigh->dev);
 820         else
 821                 return;
 822         ipoib_dbg(priv,
 823                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 824                   IPOIB_QPN(n->ha),
 825                   IPOIB_GID_RAW_ARG(n->ha + 4));
 826
 827         spin_lock_irqsave(&priv->lock, flags);
 828
 829         if (neigh->ah)
 830                 ah = neigh->ah;
 831         list_del(&neigh->list);
 832         ipoib_neigh_free(n->dev, neigh);
 833
 834         spin_unlock_irqrestore(&priv->lock, flags);
 835
 836         if (ah)
 837                 ipoib_put_ah(ah);
 838 }
 839
 840 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 841                                       struct net_device *dev)
 842 {
 843         struct ipoib_neigh *neigh;
 844
 845         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 846         if (!neigh)
 847                 return NULL;
 848
 849         neigh->neighbour = neighbour;
 850         neigh->dev = dev;
 851         *to_ipoib_neigh(neighbour) = neigh;
 852         skb_queue_head_init(&neigh->queue);
 853         ipoib_cm_set(neigh, NULL);
 854
 855         return neigh;
 856 }
 857
 858 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 859 {
 860         struct sk_buff *skb;
 861         *to_ipoib_neigh(neigh->neighbour) = NULL;
 862         while ((skb = __skb_dequeue(&neigh->queue))) {
 863                 ++dev->stats.tx_dropped;
 864                 dev_kfree_skb_any(skb);
 865         }
 866         if (ipoib_cm_get(neigh))
 867                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 868         kfree(neigh);
 869 }
 870
 871 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 872 {
 873         parms->neigh_cleanup = ipoib_neigh_cleanup;
 874
 875         return 0;
 876 }
 877
 878 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 879 {
 880         struct ipoib_dev_priv *priv = netdev_priv(dev);
 881
 882         /* Allocate RX/TX "rings" to hold queued skbs */
 883         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 884                                 GFP_KERNEL);
 885         if (!priv->rx_ring) {
 886                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 887                        ca->name, ipoib_recvq_size);
 888                 goto out;
 889         }
 890
 891         priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
 892         if (!priv->tx_ring) {
 893                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 894                        ca->name, ipoib_sendq_size);
 895                 goto out_rx_ring_cleanup;
 896         }
 897         memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
 898
 899         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 900
 901         if (ipoib_ib_dev_init(dev, ca, port))
 902                 goto out_tx_ring_cleanup;
 903
 904         return 0;
 905
 906 out_tx_ring_cleanup:
 907         vfree(priv->tx_ring);
 908
 909 out_rx_ring_cleanup:
 910         kfree(priv->rx_ring);
 911
 912 out:
 913         return -ENOMEM;
 914 }
 915
 916 void ipoib_dev_cleanup(struct net_device *dev)
 917 {
 918         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 919
 920         ipoib_delete_debug_files(dev);
 921
 922         /* Delete any child interfaces first */
 923         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 924                 unregister_netdev(cpriv->dev);
 925                 ipoib_dev_cleanup(cpriv->dev);
 926                 free_netdev(cpriv->dev);
 927         }
 928
 929         ipoib_ib_dev_cleanup(dev);
 930
 931         kfree(priv->rx_ring);
 932         vfree(priv->tx_ring);
 933
 934         priv->rx_ring = NULL;
 935         priv->tx_ring = NULL;
 936 }
 937
 938 static const struct header_ops ipoib_header_ops = {
 939         .create = ipoib_hard_header,
 940 };
 941
 942 static void ipoib_setup(struct net_device *dev)
 943 {
 944         struct ipoib_dev_priv *priv = netdev_priv(dev);
 945
 946         dev->open                = ipoib_open;
 947         dev->stop                = ipoib_stop;
 948         dev->change_mtu          = ipoib_change_mtu;
 949         dev->hard_start_xmit     = ipoib_start_xmit;
 950         dev->tx_timeout          = ipoib_timeout;
 951         dev->header_ops          = &ipoib_header_ops;
 952         dev->set_multicast_list  = ipoib_set_mcast_list;
 953         dev->neigh_setup         = ipoib_neigh_setup_dev;
 954
 955         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
 956
 957         dev->watchdog_timeo      = HZ;
 958
 959         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 960
 961         /*
 962          * We add in INFINIBAND_ALEN to allow for the destination
 963          * address "pseudoheader" for skbs without neighbour struct.
 964          */
 965         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 966         dev->addr_len            = INFINIBAND_ALEN;
 967         dev->type                = ARPHRD_INFINIBAND;
 968         dev->tx_queue_len        = ipoib_sendq_size * 2;
 969         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
 970                                     NETIF_F_LLTX                |
 971                                     NETIF_F_HIGHDMA);
 972
 973         /* MTU will be reset when mcast join happens */
 974         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 975         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 976
 977         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 978
 979         netif_carrier_off(dev);
 980
 981         priv->dev = dev;
 982
 983         spin_lock_init(&priv->lock);
 984         spin_lock_init(&priv->tx_lock);
 985
 986         mutex_init(&priv->mcast_mutex);
 987         mutex_init(&priv->vlan_mutex);
 988
 989         INIT_LIST_HEAD(&priv->path_list);
 990         INIT_LIST_HEAD(&priv->child_intfs);
 991         INIT_LIST_HEAD(&priv->dead_ahs);
 992         INIT_LIST_HEAD(&priv->multicast_list);
 993
 994         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
 995         INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
 996         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 997         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
 998         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
 999         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1000 }
1001
1002 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1003 {
1004         struct net_device *dev;
1005
1006         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1007                            ipoib_setup);
1008         if (!dev)
1009                 return NULL;
1010
1011         return netdev_priv(dev);
1012 }
1013
1014 static ssize_t show_pkey(struct device *dev,
1015                          struct device_attribute *attr, char *buf)
1016 {
1017         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1018
1019         return sprintf(buf, "0x%04x\n", priv->pkey);
1020 }
1021 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1022
1023 static ssize_t show_umcast(struct device *dev,
1024                            struct device_attribute *attr, char *buf)
1025 {
1026         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1027
1028         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1029 }
1030
1031 static ssize_t set_umcast(struct device *dev,
1032                           struct device_attribute *attr,
1033                           const char *buf, size_t count)
1034 {
1035         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1036         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1037
1038         if (umcast_val > 0) {
1039                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1040                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1041                                 "by userspace\n");
1042         } else
1043                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1044
1045         return count;
1046 }
1047 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1048
1049 int ipoib_add_umcast_attr(struct net_device *dev)
1050 {
1051         return device_create_file(&dev->dev, &dev_attr_umcast);
1052 }
1053
1054 static ssize_t create_child(struct device *dev,
1055                             struct device_attribute *attr,
1056                             const char *buf, size_t count)
1057 {
1058         int pkey;
1059         int ret;
1060
1061         if (sscanf(buf, "%i", &pkey) != 1)
1062                 return -EINVAL;
1063
1064         if (pkey < 0 || pkey > 0xffff)
1065                 return -EINVAL;
1066
1067         /*
1068          * Set the full membership bit, so that we join the right
1069          * broadcast group, etc.
1070          */
1071         pkey |= 0x8000;
1072
1073         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1074
1075         return ret ? ret : count;
1076 }
1077 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1078
1079 static ssize_t delete_child(struct device *dev,
1080                             struct device_attribute *attr,
1081                             const char *buf, size_t count)
1082 {
1083         int pkey;
1084         int ret;
1085
1086         if (sscanf(buf, "%i", &pkey) != 1)
1087                 return -EINVAL;
1088
1089         if (pkey < 0 || pkey > 0xffff)
1090                 return -EINVAL;
1091
1092         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1093
1094         return ret ? ret : count;
1095
1096 }
1097 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1098
1099 int ipoib_add_pkey_attr(struct net_device *dev)
1100 {
1101         return device_create_file(&dev->dev, &dev_attr_pkey);
1102 }
1103
1104 static struct net_device *ipoib_add_port(const char *format,
1105                                          struct ib_device *hca, u8 port)
1106 {
1107         struct ipoib_dev_priv *priv;
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         /*
1124          * Set the full membership bit, so that we join the right
1125          * broadcast group, etc.
1126          */
1127         priv->pkey |= 0x8000;
1128
1129         priv->dev->broadcast[8] = priv->pkey >> 8;
1130         priv->dev->broadcast[9] = priv->pkey & 0xff;
1131
1132         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1133         if (result) {
1134                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1135                        hca->name, port, result);
1136                 goto device_init_failed;
1137         } else
1138                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1139
1140
1141         result = ipoib_dev_init(priv->dev, hca, port);
1142         if (result < 0) {
1143                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1144                        hca->name, port, result);
1145                 goto device_init_failed;
1146         }
1147
1148         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1149                               priv->ca, ipoib_event);
1150         result = ib_register_event_handler(&priv->event_handler);
1151         if (result < 0) {
1152                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1153                        "port %d (ret = %d)\n",
1154                        hca->name, port, result);
1155                 goto event_failed;
1156         }
1157
1158         result = register_netdev(priv->dev);
1159         if (result) {
1160                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1161                        hca->name, port, result);
1162                 goto register_failed;
1163         }
1164
1165         ipoib_create_debug_files(priv->dev);
1166
1167         if (ipoib_cm_add_mode_attr(priv->dev))
1168                 goto sysfs_failed;
1169         if (ipoib_add_pkey_attr(priv->dev))
1170                 goto sysfs_failed;
1171         if (ipoib_add_umcast_attr(priv->dev))
1172                 goto sysfs_failed;
1173         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1174                 goto sysfs_failed;
1175         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1176                 goto sysfs_failed;
1177
1178         return priv->dev;
1179
1180 sysfs_failed:
1181         ipoib_delete_debug_files(priv->dev);
1182         unregister_netdev(priv->dev);
1183
1184 register_failed:
1185         ib_unregister_event_handler(&priv->event_handler);
1186         flush_scheduled_work();
1187
1188 event_failed:
1189         ipoib_dev_cleanup(priv->dev);
1190
1191 device_init_failed:
1192         free_netdev(priv->dev);
1193
1194 alloc_mem_failed:
1195         return ERR_PTR(result);
1196 }
1197
1198 static void ipoib_add_one(struct ib_device *device)
1199 {
1200         struct list_head *dev_list;
1201         struct net_device *dev;
1202         struct ipoib_dev_priv *priv;
1203         int s, e, p;
1204
1205         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1206                 return;
1207
1208         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1209         if (!dev_list)
1210                 return;
1211
1212         INIT_LIST_HEAD(dev_list);
1213
1214         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1215                 s = 0;
1216                 e = 0;
1217         } else {
1218                 s = 1;
1219                 e = device->phys_port_cnt;
1220         }
1221
1222         for (p = s; p <= e; ++p) {
1223                 dev = ipoib_add_port("ib%d", device, p);
1224                 if (!IS_ERR(dev)) {
1225                         priv = netdev_priv(dev);
1226                         list_add_tail(&priv->list, dev_list);
1227                 }
1228         }
1229
1230         ib_set_client_data(device, &ipoib_client, dev_list);
1231 }
1232
1233 static void ipoib_remove_one(struct ib_device *device)
1234 {
1235         struct ipoib_dev_priv *priv, *tmp;
1236         struct list_head *dev_list;
1237
1238         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1239                 return;
1240
1241         dev_list = ib_get_client_data(device, &ipoib_client);
1242
1243         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1244                 ib_unregister_event_handler(&priv->event_handler);
1245                 flush_scheduled_work();
1246
1247                 unregister_netdev(priv->dev);
1248                 ipoib_dev_cleanup(priv->dev);
1249                 free_netdev(priv->dev);
1250         }
1251
1252         kfree(dev_list);
1253 }
1254
1255 static int __init ipoib_init_module(void)
1256 {
1257         int ret;
1258
1259         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1260         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1261         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1262
1263         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1264         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1265         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1266 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1267         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1268 #endif
1269
1270         ret = ipoib_register_debugfs();
1271         if (ret)
1272                 return ret;
1273
1274         /*
1275          * We create our own workqueue mainly because we want to be
1276          * able to flush it when devices are being removed.  We can't
1277          * use schedule_work()/flush_scheduled_work() because both
1278          * unregister_netdev() and linkwatch_event take the rtnl lock,
1279          * so flush_scheduled_work() can deadlock during device
1280          * removal.
1281          */
1282         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1283         if (!ipoib_workqueue) {
1284                 ret = -ENOMEM;
1285                 goto err_fs;
1286         }
1287
1288         ib_sa_register_client(&ipoib_sa_client);
1289
1290         ret = ib_register_client(&ipoib_client);
1291         if (ret)
1292                 goto err_sa;
1293
1294         return 0;
1295
1296 err_sa:
1297         ib_sa_unregister_client(&ipoib_sa_client);
1298         destroy_workqueue(ipoib_workqueue);
1299
1300 err_fs:
1301         ipoib_unregister_debugfs();
1302
1303         return ret;
1304 }
1305
1306 static void __exit ipoib_cleanup_module(void)
1307 {
1308         ib_unregister_client(&ipoib_client);
1309         ib_sa_unregister_client(&ipoib_sa_client);
1310         ipoib_unregister_debugfs();
1311         destroy_workqueue(ipoib_workqueue);
1312 }
1313
1314 module_init(ipoib_init_module);
1315 module_exit(ipoib_cleanup_module);