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