drivers/infiniband/ulp/ipoib/ipoib_main.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
  35  */
  36
  37 #include "ipoib.h"
  38
  39 #include <linux/module.h>
  40
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/kernel.h>
  44
  45 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  46
  47 #include <linux/ip.h>
  48 #include <linux/in.h>
  49
  50 #include <net/dst.h>
  51
  52 MODULE_AUTHOR("Roland Dreier");
  53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  58
  59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  63
  64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  65 int ipoib_debug_level;
  66
  67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  69 #endif
  70
  71 struct ipoib_path_iter {
  72         struct net_device *dev;
  73         struct ipoib_path  path;
  74 };
  75
  76 static const u8 ipv4_bcast_addr[] = {
  77         0x00, 0xff, 0xff, 0xff,
  78         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  79         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  80 };
  81
  82 struct workqueue_struct *ipoib_workqueue;
  83
  84 struct ib_sa_client ipoib_sa_client;
  85
  86 static void ipoib_add_one(struct ib_device *device);
  87 static void ipoib_remove_one(struct ib_device *device);
  88
  89 static struct ib_client ipoib_client = {
  90         .name   = "ipoib",
  91         .add    = ipoib_add_one,
  92         .remove = ipoib_remove_one
  93 };
  94
  95 int ipoib_open(struct net_device *dev)
  96 {
  97         struct ipoib_dev_priv *priv = netdev_priv(dev);
  98
  99         ipoib_dbg(priv, "bringing up interface\n");
 100
 101         napi_enable(&priv->napi);
 102         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 103
 104         if (ipoib_pkey_dev_delay_open(dev))
 105                 return 0;
 106
 107         if (ipoib_ib_dev_open(dev)) {
 108                 napi_disable(&priv->napi);
 109                 return -EINVAL;
 110         }
 111
 112         if (ipoib_ib_dev_up(dev)) {
 113                 ipoib_ib_dev_stop(dev, 1);
 114                 napi_disable(&priv->napi);
 115                 return -EINVAL;
 116         }
 117
 118         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 119                 struct ipoib_dev_priv *cpriv;
 120
 121                 /* Bring up any child interfaces too */
 122                 mutex_lock(&priv->vlan_mutex);
 123                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 124                         int flags;
 125
 126                         flags = cpriv->dev->flags;
 127                         if (flags & IFF_UP)
 128                                 continue;
 129
 130                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 131                 }
 132                 mutex_unlock(&priv->vlan_mutex);
 133         }
 134
 135         netif_start_queue(dev);
 136
 137         return 0;
 138 }
 139
 140 static int ipoib_stop(struct net_device *dev)
 141 {
 142         struct ipoib_dev_priv *priv = netdev_priv(dev);
 143
 144         ipoib_dbg(priv, "stopping interface\n");
 145
 146         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 147         napi_disable(&priv->napi);
 148
 149         netif_stop_queue(dev);
 150
 151         /*
 152          * Now flush workqueue to make sure a scheduled task doesn't
 153          * bring our internal state back up.
 154          */
 155         flush_workqueue(ipoib_workqueue);
 156
 157         ipoib_ib_dev_down(dev, 1);
 158         ipoib_ib_dev_stop(dev, 1);
 159
 160         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 161                 struct ipoib_dev_priv *cpriv;
 162
 163                 /* Bring down any child interfaces too */
 164                 mutex_lock(&priv->vlan_mutex);
 165                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 166                         int flags;
 167
 168                         flags = cpriv->dev->flags;
 169                         if (!(flags & IFF_UP))
 170                                 continue;
 171
 172                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 173                 }
 174                 mutex_unlock(&priv->vlan_mutex);
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 181 {
 182         struct ipoib_dev_priv *priv = netdev_priv(dev);
 183
 184         /* dev->mtu > 2K ==> connected mode */
 185         if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
 186                 if (new_mtu > priv->mcast_mtu)
 187                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 188                                    priv->mcast_mtu);
 189                 dev->mtu = new_mtu;
 190                 return 0;
 191         }
 192
 193         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN) {
 194                 return -EINVAL;
 195         }
 196
 197         priv->admin_mtu = new_mtu;
 198
 199         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 200
 201         return 0;
 202 }
 203
 204 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 205 {
 206         struct ipoib_dev_priv *priv = netdev_priv(dev);
 207         struct rb_node *n = priv->path_tree.rb_node;
 208         struct ipoib_path *path;
 209         int ret;
 210
 211         while (n) {
 212                 path = rb_entry(n, struct ipoib_path, rb_node);
 213
 214                 ret = memcmp(gid, path->pathrec.dgid.raw,
 215                              sizeof (union ib_gid));
 216
 217                 if (ret < 0)
 218                         n = n->rb_left;
 219                 else if (ret > 0)
 220                         n = n->rb_right;
 221                 else
 222                         return path;
 223         }
 224
 225         return NULL;
 226 }
 227
 228 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 229 {
 230         struct ipoib_dev_priv *priv = netdev_priv(dev);
 231         struct rb_node **n = &priv->path_tree.rb_node;
 232         struct rb_node *pn = NULL;
 233         struct ipoib_path *tpath;
 234         int ret;
 235
 236         while (*n) {
 237                 pn = *n;
 238                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 239
 240                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 241                              sizeof (union ib_gid));
 242                 if (ret < 0)
 243                         n = &pn->rb_left;
 244                 else if (ret > 0)
 245                         n = &pn->rb_right;
 246                 else
 247                         return -EEXIST;
 248         }
 249
 250         rb_link_node(&path->rb_node, pn, n);
 251         rb_insert_color(&path->rb_node, &priv->path_tree);
 252
 253         list_add_tail(&path->list, &priv->path_list);
 254
 255         return 0;
 256 }
 257
 258 static void path_free(struct net_device *dev, struct ipoib_path *path)
 259 {
 260         struct ipoib_dev_priv *priv = netdev_priv(dev);
 261         struct ipoib_neigh *neigh, *tn;
 262         struct sk_buff *skb;
 263         unsigned long flags;
 264
 265         while ((skb = __skb_dequeue(&path->queue)))
 266                 dev_kfree_skb_irq(skb);
 267
 268         spin_lock_irqsave(&priv->lock, flags);
 269
 270         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 271                 /*
 272                  * It's safe to call ipoib_put_ah() inside priv->lock
 273                  * here, because we know that path->ah will always
 274                  * hold one more reference, so ipoib_put_ah() will
 275                  * never do more than decrement the ref count.
 276                  */
 277                 if (neigh->ah)
 278                         ipoib_put_ah(neigh->ah);
 279
 280                 ipoib_neigh_free(dev, neigh);
 281         }
 282
 283         spin_unlock_irqrestore(&priv->lock, flags);
 284
 285         if (path->ah)
 286                 ipoib_put_ah(path->ah);
 287
 288         kfree(path);
 289 }
 290
 291 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 292
 293 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 294 {
 295         struct ipoib_path_iter *iter;
 296
 297         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 298         if (!iter)
 299                 return NULL;
 300
 301         iter->dev = dev;
 302         memset(iter->path.pathrec.dgid.raw, 0, 16);
 303
 304         if (ipoib_path_iter_next(iter)) {
 305                 kfree(iter);
 306                 return NULL;
 307         }
 308
 309         return iter;
 310 }
 311
 312 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 313 {
 314         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 315         struct rb_node *n;
 316         struct ipoib_path *path;
 317         int ret = 1;
 318
 319         spin_lock_irq(&priv->lock);
 320
 321         n = rb_first(&priv->path_tree);
 322
 323         while (n) {
 324                 path = rb_entry(n, struct ipoib_path, rb_node);
 325
 326                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 327                            sizeof (union ib_gid)) < 0) {
 328                         iter->path = *path;
 329                         ret = 0;
 330                         break;
 331                 }
 332
 333                 n = rb_next(n);
 334         }
 335
 336         spin_unlock_irq(&priv->lock);
 337
 338         return ret;
 339 }
 340
 341 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 342                           struct ipoib_path *path)
 343 {
 344         *path = iter->path;
 345 }
 346
 347 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 348
 349 void ipoib_flush_paths(struct net_device *dev)
 350 {
 351         struct ipoib_dev_priv *priv = netdev_priv(dev);
 352         struct ipoib_path *path, *tp;
 353         LIST_HEAD(remove_list);
 354
 355         spin_lock_irq(&priv->tx_lock);
 356         spin_lock(&priv->lock);
 357
 358         list_splice(&priv->path_list, &remove_list);
 359         INIT_LIST_HEAD(&priv->path_list);
 360
 361         list_for_each_entry(path, &remove_list, list)
 362                 rb_erase(&path->rb_node, &priv->path_tree);
 363
 364         list_for_each_entry_safe(path, tp, &remove_list, list) {
 365                 if (path->query)
 366                         ib_sa_cancel_query(path->query_id, path->query);
 367                 spin_unlock(&priv->lock);
 368                 spin_unlock_irq(&priv->tx_lock);
 369                 wait_for_completion(&path->done);
 370                 path_free(dev, path);
 371                 spin_lock_irq(&priv->tx_lock);
 372                 spin_lock(&priv->lock);
 373         }
 374         spin_unlock(&priv->lock);
 375         spin_unlock_irq(&priv->tx_lock);
 376 }
 377
 378 static void path_rec_completion(int status,
 379                                 struct ib_sa_path_rec *pathrec,
 380                                 void *path_ptr)
 381 {
 382         struct ipoib_path *path = path_ptr;
 383         struct net_device *dev = path->dev;
 384         struct ipoib_dev_priv *priv = netdev_priv(dev);
 385         struct ipoib_ah *ah = NULL;
 386         struct ipoib_neigh *neigh, *tn;
 387         struct sk_buff_head skqueue;
 388         struct sk_buff *skb;
 389         unsigned long flags;
 390
 391         if (!status)
 392                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 393                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 394         else
 395                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 396                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 397
 398         skb_queue_head_init(&skqueue);
 399
 400         if (!status) {
 401                 struct ib_ah_attr av;
 402
 403                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 404                         ah = ipoib_create_ah(dev, priv->pd, &av);
 405         }
 406
 407         spin_lock_irqsave(&priv->lock, flags);
 408
 409         path->ah = ah;
 410
 411         if (ah) {
 412                 path->pathrec = *pathrec;
 413
 414                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 415                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 416
 417                 while ((skb = __skb_dequeue(&path->queue)))
 418                         __skb_queue_tail(&skqueue, skb);
 419
 420                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 421                         kref_get(&path->ah->ref);
 422                         neigh->ah = path->ah;
 423                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 424                                sizeof(union ib_gid));
 425
 426                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 427                                 if (!ipoib_cm_get(neigh))
 428                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 429                                                                                path,
 430                                                                                neigh));
 431                                 if (!ipoib_cm_get(neigh)) {
 432                                         list_del(&neigh->list);
 433                                         if (neigh->ah)
 434                                                 ipoib_put_ah(neigh->ah);
 435                                         ipoib_neigh_free(dev, neigh);
 436                                         continue;
 437                                 }
 438                         }
 439
 440                         while ((skb = __skb_dequeue(&neigh->queue)))
 441                                 __skb_queue_tail(&skqueue, skb);
 442                 }
 443         }
 444
 445         path->query = NULL;
 446         complete(&path->done);
 447
 448         spin_unlock_irqrestore(&priv->lock, flags);
 449
 450         while ((skb = __skb_dequeue(&skqueue))) {
 451                 skb->dev = dev;
 452                 if (dev_queue_xmit(skb))
 453                         ipoib_warn(priv, "dev_queue_xmit failed "
 454                                    "to requeue packet\n");
 455         }
 456 }
 457
 458 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 459 {
 460         struct ipoib_dev_priv *priv = netdev_priv(dev);
 461         struct ipoib_path *path;
 462
 463         path = kzalloc(sizeof *path, GFP_ATOMIC);
 464         if (!path)
 465                 return NULL;
 466
 467         path->dev = dev;
 468
 469         skb_queue_head_init(&path->queue);
 470
 471         INIT_LIST_HEAD(&path->neigh_list);
 472
 473         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 474         path->pathrec.sgid          = priv->local_gid;
 475         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 476         path->pathrec.numb_path     = 1;
 477         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 478
 479         return path;
 480 }
 481
 482 static int path_rec_start(struct net_device *dev,
 483                           struct ipoib_path *path)
 484 {
 485         struct ipoib_dev_priv *priv = netdev_priv(dev);
 486
 487         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 488                   IPOIB_GID_ARG(path->pathrec.dgid));
 489
 490         init_completion(&path->done);
 491
 492         path->query_id =
 493                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 494                                    &path->pathrec,
 495                                    IB_SA_PATH_REC_DGID          |
 496                                    IB_SA_PATH_REC_SGID          |
 497                                    IB_SA_PATH_REC_NUMB_PATH     |
 498                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 499                                    IB_SA_PATH_REC_PKEY,
 500                                    1000, GFP_ATOMIC,
 501                                    path_rec_completion,
 502                                    path, &path->query);
 503         if (path->query_id < 0) {
 504                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 505                 path->query = NULL;
 506                 return path->query_id;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 513 {
 514         struct ipoib_dev_priv *priv = netdev_priv(dev);
 515         struct ipoib_path *path;
 516         struct ipoib_neigh *neigh;
 517
 518         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 519         if (!neigh) {
 520                 ++dev->stats.tx_dropped;
 521                 dev_kfree_skb_any(skb);
 522                 return;
 523         }
 524
 525         /*
 526          * We can only be called from ipoib_start_xmit, so we're
 527          * inside tx_lock -- no need to save/restore flags.
 528          */
 529         spin_lock(&priv->lock);
 530
 531         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 532         if (!path) {
 533                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 534                 if (!path)
 535                         goto err_path;
 536
 537                 __path_add(dev, path);
 538         }
 539
 540         list_add_tail(&neigh->list, &path->neigh_list);
 541
 542         if (path->ah) {
 543                 kref_get(&path->ah->ref);
 544                 neigh->ah = path->ah;
 545                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 546                        sizeof(union ib_gid));
 547
 548                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 549                         if (!ipoib_cm_get(neigh))
 550                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 551                         if (!ipoib_cm_get(neigh)) {
 552                                 list_del(&neigh->list);
 553                                 if (neigh->ah)
 554                                         ipoib_put_ah(neigh->ah);
 555                                 ipoib_neigh_free(dev, neigh);
 556                                 goto err_drop;
 557                         }
 558                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 559                                 __skb_queue_tail(&neigh->queue, skb);
 560                         else {
 561                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 562                                            skb_queue_len(&neigh->queue));
 563                                 goto err_drop;
 564                         }
 565                 } else
 566                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 567         } else {
 568                 neigh->ah  = NULL;
 569
 570                 if (!path->query && path_rec_start(dev, path))
 571                         goto err_list;
 572
 573                 __skb_queue_tail(&neigh->queue, skb);
 574         }
 575
 576         spin_unlock(&priv->lock);
 577         return;
 578
 579 err_list:
 580         list_del(&neigh->list);
 581
 582 err_path:
 583         ipoib_neigh_free(dev, neigh);
 584 err_drop:
 585         ++dev->stats.tx_dropped;
 586         dev_kfree_skb_any(skb);
 587
 588         spin_unlock(&priv->lock);
 589 }
 590
 591 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 592 {
 593         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 594
 595         /* Look up path record for unicasts */
 596         if (skb->dst->neighbour->ha[4] != 0xff) {
 597                 neigh_add_path(skb, dev);
 598                 return;
 599         }
 600
 601         /* Add in the P_Key for multicasts */
 602         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 603         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 604         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 605 }
 606
 607 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 608                              struct ipoib_pseudoheader *phdr)
 609 {
 610         struct ipoib_dev_priv *priv = netdev_priv(dev);
 611         struct ipoib_path *path;
 612
 613         /*
 614          * We can only be called from ipoib_start_xmit, so we're
 615          * inside tx_lock -- no need to save/restore flags.
 616          */
 617         spin_lock(&priv->lock);
 618
 619         path = __path_find(dev, phdr->hwaddr + 4);
 620         if (!path) {
 621                 path = path_rec_create(dev, phdr->hwaddr + 4);
 622                 if (path) {
 623                         /* put pseudoheader back on for next time */
 624                         skb_push(skb, sizeof *phdr);
 625                         __skb_queue_tail(&path->queue, skb);
 626
 627                         if (path_rec_start(dev, path)) {
 628                                 spin_unlock(&priv->lock);
 629                                 path_free(dev, path);
 630                                 return;
 631                         } else
 632                                 __path_add(dev, path);
 633                 } else {
 634                         ++dev->stats.tx_dropped;
 635                         dev_kfree_skb_any(skb);
 636                 }
 637
 638                 spin_unlock(&priv->lock);
 639                 return;
 640         }
 641
 642         if (path->ah) {
 643                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 644                           be16_to_cpu(path->pathrec.dlid));
 645
 646                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 647         } else if ((path->query || !path_rec_start(dev, path)) &&
 648                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 649                 /* put pseudoheader back on for next time */
 650                 skb_push(skb, sizeof *phdr);
 651                 __skb_queue_tail(&path->queue, skb);
 652         } else {
 653                 ++dev->stats.tx_dropped;
 654                 dev_kfree_skb_any(skb);
 655         }
 656
 657         spin_unlock(&priv->lock);
 658 }
 659
 660 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 661 {
 662         struct ipoib_dev_priv *priv = netdev_priv(dev);
 663         struct ipoib_neigh *neigh;
 664         unsigned long flags;
 665
 666         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 667                 return NETDEV_TX_LOCKED;
 668
 669         /*
 670          * Check if our queue is stopped.  Since we have the LLTX bit
 671          * set, we can't rely on netif_stop_queue() preventing our
 672          * xmit function from being called with a full queue.
 673          */
 674         if (unlikely(netif_queue_stopped(dev))) {
 675                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 676                 return NETDEV_TX_BUSY;
 677         }
 678
 679         if (likely(skb->dst && skb->dst->neighbour)) {
 680                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 681                         ipoib_path_lookup(skb, dev);
 682                         goto out;
 683                 }
 684
 685                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 686
 687                 if (ipoib_cm_get(neigh)) {
 688                         if (ipoib_cm_up(neigh)) {
 689                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 690                                 goto out;
 691                         }
 692                 } else if (neigh->ah) {
 693                         if (unlikely((memcmp(&neigh->dgid.raw,
 694                                             skb->dst->neighbour->ha + 4,
 695                                             sizeof(union ib_gid))) ||
 696                                          (neigh->dev != dev))) {
 697                                 spin_lock(&priv->lock);
 698                                 /*
 699                                  * It's safe to call ipoib_put_ah() inside
 700                                  * priv->lock here, because we know that
 701                                  * path->ah will always hold one more reference,
 702                                  * so ipoib_put_ah() will never do more than
 703                                  * decrement the ref count.
 704                                  */
 705                                 ipoib_put_ah(neigh->ah);
 706                                 list_del(&neigh->list);
 707                                 ipoib_neigh_free(dev, neigh);
 708                                 spin_unlock(&priv->lock);
 709                                 ipoib_path_lookup(skb, dev);
 710                                 goto out;
 711                         }
 712
 713                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 714                         goto out;
 715                 }
 716
 717                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 718                         spin_lock(&priv->lock);
 719                         __skb_queue_tail(&neigh->queue, skb);
 720                         spin_unlock(&priv->lock);
 721                 } else {
 722                         ++dev->stats.tx_dropped;
 723                         dev_kfree_skb_any(skb);
 724                 }
 725         } else {
 726                 struct ipoib_pseudoheader *phdr =
 727                         (struct ipoib_pseudoheader *) skb->data;
 728                 skb_pull(skb, sizeof *phdr);
 729
 730                 if (phdr->hwaddr[4] == 0xff) {
 731                         /* Add in the P_Key for multicast*/
 732                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 733                         phdr->hwaddr[9] = priv->pkey & 0xff;
 734
 735                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 736                 } else {
 737                         /* unicast GID -- should be ARP or RARP reply */
 738
 739                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 740                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 741                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 742                                            IPOIB_GID_FMT "\n",
 743                                            skb->dst ? "neigh" : "dst",
 744                                            be16_to_cpup((__be16 *) skb->data),
 745                                            IPOIB_QPN(phdr->hwaddr),
 746                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 747                                 dev_kfree_skb_any(skb);
 748                                 ++dev->stats.tx_dropped;
 749                                 goto out;
 750                         }
 751
 752                         unicast_arp_send(skb, dev, phdr);
 753                 }
 754         }
 755
 756 out:
 757         spin_unlock_irqrestore(&priv->tx_lock, flags);
 758
 759         return NETDEV_TX_OK;
 760 }
 761
 762 static void ipoib_timeout(struct net_device *dev)
 763 {
 764         struct ipoib_dev_priv *priv = netdev_priv(dev);
 765
 766         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 767                    jiffies_to_msecs(jiffies - dev->trans_start));
 768         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 769                    netif_queue_stopped(dev),
 770                    priv->tx_head, priv->tx_tail);
 771         /* XXX reset QP, etc. */
 772 }
 773
 774 static int ipoib_hard_header(struct sk_buff *skb,
 775                              struct net_device *dev,
 776                              unsigned short type,
 777                              const void *daddr, const void *saddr, unsigned len)
 778 {
 779         struct ipoib_header *header;
 780
 781         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 782
 783         header->proto = htons(type);
 784         header->reserved = 0;
 785
 786         /*
 787          * If we don't have a neighbour structure, stuff the
 788          * destination address onto the front of the skb so we can
 789          * figure out where to send the packet later.
 790          */
 791         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 792                 struct ipoib_pseudoheader *phdr =
 793                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 794                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 795         }
 796
 797         return 0;
 798 }
 799
 800 static void ipoib_set_mcast_list(struct net_device *dev)
 801 {
 802         struct ipoib_dev_priv *priv = netdev_priv(dev);
 803
 804         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 805                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 806                 return;
 807         }
 808
 809         queue_work(ipoib_workqueue, &priv->restart_task);
 810 }
 811
 812 static void ipoib_neigh_cleanup(struct neighbour *n)
 813 {
 814         struct ipoib_neigh *neigh;
 815         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 816         unsigned long flags;
 817         struct ipoib_ah *ah = NULL;
 818
 819         neigh = *to_ipoib_neigh(n);
 820         if (neigh) {
 821                 priv = netdev_priv(neigh->dev);
 822                 ipoib_dbg(priv, "neigh_destructor for bonding device: %s\n",
 823                           n->dev->name);
 824         } else
 825                 return;
 826         ipoib_dbg(priv,
 827                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 828                   IPOIB_QPN(n->ha),
 829                   IPOIB_GID_RAW_ARG(n->ha + 4));
 830
 831         spin_lock_irqsave(&priv->lock, flags);
 832
 833         if (neigh->ah)
 834                 ah = neigh->ah;
 835         list_del(&neigh->list);
 836         ipoib_neigh_free(n->dev, neigh);
 837
 838         spin_unlock_irqrestore(&priv->lock, flags);
 839
 840         if (ah)
 841                 ipoib_put_ah(ah);
 842 }
 843
 844 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 845                                       struct net_device *dev)
 846 {
 847         struct ipoib_neigh *neigh;
 848
 849         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 850         if (!neigh)
 851                 return NULL;
 852
 853         neigh->neighbour = neighbour;
 854         neigh->dev = dev;
 855         *to_ipoib_neigh(neighbour) = neigh;
 856         skb_queue_head_init(&neigh->queue);
 857         ipoib_cm_set(neigh, NULL);
 858
 859         return neigh;
 860 }
 861
 862 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 863 {
 864         struct sk_buff *skb;
 865         *to_ipoib_neigh(neigh->neighbour) = NULL;
 866         while ((skb = __skb_dequeue(&neigh->queue))) {
 867                 ++dev->stats.tx_dropped;
 868                 dev_kfree_skb_any(skb);
 869         }
 870         if (ipoib_cm_get(neigh))
 871                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 872         kfree(neigh);
 873 }
 874
 875 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 876 {
 877         parms->neigh_cleanup = ipoib_neigh_cleanup;
 878
 879         return 0;
 880 }
 881
 882 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 883 {
 884         struct ipoib_dev_priv *priv = netdev_priv(dev);
 885
 886         /* Allocate RX/TX "rings" to hold queued skbs */
 887         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 888                                 GFP_KERNEL);
 889         if (!priv->rx_ring) {
 890                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 891                        ca->name, ipoib_recvq_size);
 892                 goto out;
 893         }
 894
 895         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
 896                                 GFP_KERNEL);
 897         if (!priv->tx_ring) {
 898                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 899                        ca->name, ipoib_sendq_size);
 900                 goto out_rx_ring_cleanup;
 901         }
 902
 903         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 904
 905         if (ipoib_ib_dev_init(dev, ca, port))
 906                 goto out_tx_ring_cleanup;
 907
 908         return 0;
 909
 910 out_tx_ring_cleanup:
 911         kfree(priv->tx_ring);
 912
 913 out_rx_ring_cleanup:
 914         kfree(priv->rx_ring);
 915
 916 out:
 917         return -ENOMEM;
 918 }
 919
 920 void ipoib_dev_cleanup(struct net_device *dev)
 921 {
 922         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 923
 924         ipoib_delete_debug_files(dev);
 925
 926         /* Delete any child interfaces first */
 927         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 928                 unregister_netdev(cpriv->dev);
 929                 ipoib_dev_cleanup(cpriv->dev);
 930                 free_netdev(cpriv->dev);
 931         }
 932
 933         ipoib_ib_dev_cleanup(dev);
 934
 935         kfree(priv->rx_ring);
 936         kfree(priv->tx_ring);
 937
 938         priv->rx_ring = NULL;
 939         priv->tx_ring = NULL;
 940 }
 941
 942 static const struct header_ops ipoib_header_ops = {
 943         .create = ipoib_hard_header,
 944 };
 945
 946 static void ipoib_setup(struct net_device *dev)
 947 {
 948         struct ipoib_dev_priv *priv = netdev_priv(dev);
 949
 950         dev->open                = ipoib_open;
 951         dev->stop                = ipoib_stop;
 952         dev->change_mtu          = ipoib_change_mtu;
 953         dev->hard_start_xmit     = ipoib_start_xmit;
 954         dev->tx_timeout          = ipoib_timeout;
 955         dev->header_ops          = &ipoib_header_ops;
 956         dev->set_multicast_list  = ipoib_set_mcast_list;
 957         dev->neigh_setup         = ipoib_neigh_setup_dev;
 958
 959         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
 960
 961         dev->watchdog_timeo      = HZ;
 962
 963         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 964
 965         /*
 966          * We add in INFINIBAND_ALEN to allow for the destination
 967          * address "pseudoheader" for skbs without neighbour struct.
 968          */
 969         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 970         dev->addr_len            = INFINIBAND_ALEN;
 971         dev->type                = ARPHRD_INFINIBAND;
 972         dev->tx_queue_len        = ipoib_sendq_size * 2;
 973         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
 974
 975         /* MTU will be reset when mcast join happens */
 976         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 977         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 978
 979         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 980
 981         netif_carrier_off(dev);
 982
 983         priv->dev = dev;
 984
 985         spin_lock_init(&priv->lock);
 986         spin_lock_init(&priv->tx_lock);
 987
 988         mutex_init(&priv->mcast_mutex);
 989         mutex_init(&priv->vlan_mutex);
 990
 991         INIT_LIST_HEAD(&priv->path_list);
 992         INIT_LIST_HEAD(&priv->child_intfs);
 993         INIT_LIST_HEAD(&priv->dead_ahs);
 994         INIT_LIST_HEAD(&priv->multicast_list);
 995
 996         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
 997         INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
 998         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 999         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
1000         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1001         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1002 }
1003
1004 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1005 {
1006         struct net_device *dev;
1007
1008         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1009                            ipoib_setup);
1010         if (!dev)
1011                 return NULL;
1012
1013         return netdev_priv(dev);
1014 }
1015
1016 static ssize_t show_pkey(struct device *dev,
1017                          struct device_attribute *attr, char *buf)
1018 {
1019         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1020
1021         return sprintf(buf, "0x%04x\n", priv->pkey);
1022 }
1023 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1024
1025 static ssize_t show_umcast(struct device *dev,
1026                            struct device_attribute *attr, char *buf)
1027 {
1028         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1029
1030         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1031 }
1032
1033 static ssize_t set_umcast(struct device *dev,
1034                           struct device_attribute *attr,
1035                           const char *buf, size_t count)
1036 {
1037         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1038         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1039
1040         if (umcast_val > 0) {
1041                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1042                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1043                                 "by userspace\n");
1044         } else
1045                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1046
1047         return count;
1048 }
1049 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1050
1051 int ipoib_add_umcast_attr(struct net_device *dev)
1052 {
1053         return device_create_file(&dev->dev, &dev_attr_umcast);
1054 }
1055
1056 static ssize_t create_child(struct device *dev,
1057                             struct device_attribute *attr,
1058                             const char *buf, size_t count)
1059 {
1060         int pkey;
1061         int ret;
1062
1063         if (sscanf(buf, "%i", &pkey) != 1)
1064                 return -EINVAL;
1065
1066         if (pkey < 0 || pkey > 0xffff)
1067                 return -EINVAL;
1068
1069         /*
1070          * Set the full membership bit, so that we join the right
1071          * broadcast group, etc.
1072          */
1073         pkey |= 0x8000;
1074
1075         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1076
1077         return ret ? ret : count;
1078 }
1079 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1080
1081 static ssize_t delete_child(struct device *dev,
1082                             struct device_attribute *attr,
1083                             const char *buf, size_t count)
1084 {
1085         int pkey;
1086         int ret;
1087
1088         if (sscanf(buf, "%i", &pkey) != 1)
1089                 return -EINVAL;
1090
1091         if (pkey < 0 || pkey > 0xffff)
1092                 return -EINVAL;
1093
1094         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1095
1096         return ret ? ret : count;
1097
1098 }
1099 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1100
1101 int ipoib_add_pkey_attr(struct net_device *dev)
1102 {
1103         return device_create_file(&dev->dev, &dev_attr_pkey);
1104 }
1105
1106 static struct net_device *ipoib_add_port(const char *format,
1107                                          struct ib_device *hca, u8 port)
1108 {
1109         struct ipoib_dev_priv *priv;
1110         int result = -ENOMEM;
1111
1112         priv = ipoib_intf_alloc(format);
1113         if (!priv)
1114                 goto alloc_mem_failed;
1115
1116         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1117
1118         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1119         if (result) {
1120                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1121                        hca->name, port, result);
1122                 goto device_init_failed;
1123         }
1124
1125         /*
1126          * Set the full membership bit, so that we join the right
1127          * broadcast group, etc.
1128          */
1129         priv->pkey |= 0x8000;
1130
1131         priv->dev->broadcast[8] = priv->pkey >> 8;
1132         priv->dev->broadcast[9] = priv->pkey & 0xff;
1133
1134         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1135         if (result) {
1136                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1137                        hca->name, port, result);
1138                 goto device_init_failed;
1139         } else
1140                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1141
1142
1143         result = ipoib_dev_init(priv->dev, hca, port);
1144         if (result < 0) {
1145                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1146                        hca->name, port, result);
1147                 goto device_init_failed;
1148         }
1149
1150         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1151                               priv->ca, ipoib_event);
1152         result = ib_register_event_handler(&priv->event_handler);
1153         if (result < 0) {
1154                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1155                        "port %d (ret = %d)\n",
1156                        hca->name, port, result);
1157                 goto event_failed;
1158         }
1159
1160         result = register_netdev(priv->dev);
1161         if (result) {
1162                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1163                        hca->name, port, result);
1164                 goto register_failed;
1165         }
1166
1167         ipoib_create_debug_files(priv->dev);
1168
1169         if (ipoib_cm_add_mode_attr(priv->dev))
1170                 goto sysfs_failed;
1171         if (ipoib_add_pkey_attr(priv->dev))
1172                 goto sysfs_failed;
1173         if (ipoib_add_umcast_attr(priv->dev))
1174                 goto sysfs_failed;
1175         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1176                 goto sysfs_failed;
1177         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1178                 goto sysfs_failed;
1179
1180         return priv->dev;
1181
1182 sysfs_failed:
1183         ipoib_delete_debug_files(priv->dev);
1184         unregister_netdev(priv->dev);
1185
1186 register_failed:
1187         ib_unregister_event_handler(&priv->event_handler);
1188         flush_scheduled_work();
1189
1190 event_failed:
1191         ipoib_dev_cleanup(priv->dev);
1192
1193 device_init_failed:
1194         free_netdev(priv->dev);
1195
1196 alloc_mem_failed:
1197         return ERR_PTR(result);
1198 }
1199
1200 static void ipoib_add_one(struct ib_device *device)
1201 {
1202         struct list_head *dev_list;
1203         struct net_device *dev;
1204         struct ipoib_dev_priv *priv;
1205         int s, e, p;
1206
1207         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1208                 return;
1209
1210         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1211         if (!dev_list)
1212                 return;
1213
1214         INIT_LIST_HEAD(dev_list);
1215
1216         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1217                 s = 0;
1218                 e = 0;
1219         } else {
1220                 s = 1;
1221                 e = device->phys_port_cnt;
1222         }
1223
1224         for (p = s; p <= e; ++p) {
1225                 dev = ipoib_add_port("ib%d", device, p);
1226                 if (!IS_ERR(dev)) {
1227                         priv = netdev_priv(dev);
1228                         list_add_tail(&priv->list, dev_list);
1229                 }
1230         }
1231
1232         ib_set_client_data(device, &ipoib_client, dev_list);
1233 }
1234
1235 static void ipoib_remove_one(struct ib_device *device)
1236 {
1237         struct ipoib_dev_priv *priv, *tmp;
1238         struct list_head *dev_list;
1239
1240         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1241                 return;
1242
1243         dev_list = ib_get_client_data(device, &ipoib_client);
1244
1245         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1246                 ib_unregister_event_handler(&priv->event_handler);
1247                 flush_scheduled_work();
1248
1249                 unregister_netdev(priv->dev);
1250                 ipoib_dev_cleanup(priv->dev);
1251                 free_netdev(priv->dev);
1252         }
1253
1254         kfree(dev_list);
1255 }
1256
1257 static int __init ipoib_init_module(void)
1258 {
1259         int ret;
1260
1261         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1262         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1263         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1264
1265         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1266         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1267         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1268
1269         ret = ipoib_register_debugfs();
1270         if (ret)
1271                 return ret;
1272
1273         /*
1274          * We create our own workqueue mainly because we want to be
1275          * able to flush it when devices are being removed.  We can't
1276          * use schedule_work()/flush_scheduled_work() because both
1277          * unregister_netdev() and linkwatch_event take the rtnl lock,
1278          * so flush_scheduled_work() can deadlock during device
1279          * removal.
1280          */
1281         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1282         if (!ipoib_workqueue) {
1283                 ret = -ENOMEM;
1284                 goto err_fs;
1285         }
1286
1287         ib_sa_register_client(&ipoib_sa_client);
1288
1289         ret = ib_register_client(&ipoib_client);
1290         if (ret)
1291                 goto err_sa;
1292
1293         return 0;
1294
1295 err_sa:
1296         ib_sa_unregister_client(&ipoib_sa_client);
1297         destroy_workqueue(ipoib_workqueue);
1298
1299 err_fs:
1300         ipoib_unregister_debugfs();
1301
1302         return ret;
1303 }
1304
1305 static void __exit ipoib_cleanup_module(void)
1306 {
1307         ib_unregister_client(&ipoib_client);
1308         ib_sa_unregister_client(&ipoib_sa_client);
1309         ipoib_unregister_debugfs();
1310         destroy_workqueue(ipoib_workqueue);
1311 }
1312
1313 module_init(ipoib_init_module);
1314 module_exit(ipoib_cleanup_module);