err.no Git - linux-2.6/blob - drivers/infiniband/ulp/ipoib/ipoib_main.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include "ipoib.h"
  36
  37 #include <linux/module.h>
  38
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/kernel.h>
  42 #include <linux/vmalloc.h>
  43
  44 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  45
  46 #include <linux/ip.h>
  47 #include <linux/in.h>
  48
  49 #include <net/dst.h>
  50
  51 MODULE_AUTHOR("Roland Dreier");
  52 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  53 MODULE_LICENSE("Dual BSD/GPL");
  54
  55 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  56 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  57
  58 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  59 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  60 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  61 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  62
  63 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  64 int ipoib_debug_level;
  65
  66 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  67 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  68 #endif
  69
  70 struct ipoib_path_iter {
  71         struct net_device *dev;
  72         struct ipoib_path  path;
  73 };
  74
  75 static const u8 ipv4_bcast_addr[] = {
  76         0x00, 0xff, 0xff, 0xff,
  77         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  78         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  79 };
  80
  81 struct workqueue_struct *ipoib_workqueue;
  82
  83 struct ib_sa_client ipoib_sa_client;
  84
  85 static void ipoib_add_one(struct ib_device *device);
  86 static void ipoib_remove_one(struct ib_device *device);
  87
  88 static struct ib_client ipoib_client = {
  89         .name   = "ipoib",
  90         .add    = ipoib_add_one,
  91         .remove = ipoib_remove_one
  92 };
  93
  94 int ipoib_open(struct net_device *dev)
  95 {
  96         struct ipoib_dev_priv *priv = netdev_priv(dev);
  97
  98         ipoib_dbg(priv, "bringing up interface\n");
  99
 100         napi_enable(&priv->napi);
 101         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 102
 103         if (ipoib_pkey_dev_delay_open(dev))
 104                 return 0;
 105
 106         if (ipoib_ib_dev_open(dev)) {
 107                 napi_disable(&priv->napi);
 108                 return -EINVAL;
 109         }
 110
 111         if (ipoib_ib_dev_up(dev)) {
 112                 ipoib_ib_dev_stop(dev, 1);
 113                 napi_disable(&priv->napi);
 114                 return -EINVAL;
 115         }
 116
 117         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 118                 struct ipoib_dev_priv *cpriv;
 119
 120                 /* Bring up any child interfaces too */
 121                 mutex_lock(&priv->vlan_mutex);
 122                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 123                         int flags;
 124
 125                         flags = cpriv->dev->flags;
 126                         if (flags & IFF_UP)
 127                                 continue;
 128
 129                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 130                 }
 131                 mutex_unlock(&priv->vlan_mutex);
 132         }
 133
 134         netif_start_queue(dev);
 135
 136         return 0;
 137 }
 138
 139 static int ipoib_stop(struct net_device *dev)
 140 {
 141         struct ipoib_dev_priv *priv = netdev_priv(dev);
 142
 143         ipoib_dbg(priv, "stopping interface\n");
 144
 145         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 146         napi_disable(&priv->napi);
 147
 148         netif_stop_queue(dev);
 149
 150         /*
 151          * Now flush workqueue to make sure a scheduled task doesn't
 152          * bring our internal state back up.
 153          */
 154         flush_workqueue(ipoib_workqueue);
 155
 156         ipoib_ib_dev_down(dev, 1);
 157         ipoib_ib_dev_stop(dev, 1);
 158
 159         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 160                 struct ipoib_dev_priv *cpriv;
 161
 162                 /* Bring down any child interfaces too */
 163                 mutex_lock(&priv->vlan_mutex);
 164                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 165                         int flags;
 166
 167                         flags = cpriv->dev->flags;
 168                         if (!(flags & IFF_UP))
 169                                 continue;
 170
 171                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 172                 }
 173                 mutex_unlock(&priv->vlan_mutex);
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 180 {
 181         struct ipoib_dev_priv *priv = netdev_priv(dev);
 182
 183         /* dev->mtu > 2K ==> connected mode */
 184         if (ipoib_cm_admin_enabled(dev)) {
 185                 if (new_mtu > ipoib_cm_max_mtu(dev))
 186                         return -EINVAL;
 187
 188                 if (new_mtu > priv->mcast_mtu)
 189                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 190                                    priv->mcast_mtu);
 191
 192                 dev->mtu = new_mtu;
 193                 return 0;
 194         }
 195
 196         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 197                 return -EINVAL;
 198
 199         priv->admin_mtu = new_mtu;
 200
 201         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 202
 203         return 0;
 204 }
 205
 206 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 207 {
 208         struct ipoib_dev_priv *priv = netdev_priv(dev);
 209         struct rb_node *n = priv->path_tree.rb_node;
 210         struct ipoib_path *path;
 211         int ret;
 212
 213         while (n) {
 214                 path = rb_entry(n, struct ipoib_path, rb_node);
 215
 216                 ret = memcmp(gid, path->pathrec.dgid.raw,
 217                              sizeof (union ib_gid));
 218
 219                 if (ret < 0)
 220                         n = n->rb_left;
 221                 else if (ret > 0)
 222                         n = n->rb_right;
 223                 else
 224                         return path;
 225         }
 226
 227         return NULL;
 228 }
 229
 230 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 231 {
 232         struct ipoib_dev_priv *priv = netdev_priv(dev);
 233         struct rb_node **n = &priv->path_tree.rb_node;
 234         struct rb_node *pn = NULL;
 235         struct ipoib_path *tpath;
 236         int ret;
 237
 238         while (*n) {
 239                 pn = *n;
 240                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 241
 242                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 243                              sizeof (union ib_gid));
 244                 if (ret < 0)
 245                         n = &pn->rb_left;
 246                 else if (ret > 0)
 247                         n = &pn->rb_right;
 248                 else
 249                         return -EEXIST;
 250         }
 251
 252         rb_link_node(&path->rb_node, pn, n);
 253         rb_insert_color(&path->rb_node, &priv->path_tree);
 254
 255         list_add_tail(&path->list, &priv->path_list);
 256
 257         return 0;
 258 }
 259
 260 static void path_free(struct net_device *dev, struct ipoib_path *path)
 261 {
 262         struct ipoib_dev_priv *priv = netdev_priv(dev);
 263         struct ipoib_neigh *neigh, *tn;
 264         struct sk_buff *skb;
 265         unsigned long flags;
 266
 267         while ((skb = __skb_dequeue(&path->queue)))
 268                 dev_kfree_skb_irq(skb);
 269
 270         spin_lock_irqsave(&priv->lock, flags);
 271
 272         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 273                 /*
 274                  * It's safe to call ipoib_put_ah() inside priv->lock
 275                  * here, because we know that path->ah will always
 276                  * hold one more reference, so ipoib_put_ah() will
 277                  * never do more than decrement the ref count.
 278                  */
 279                 if (neigh->ah)
 280                         ipoib_put_ah(neigh->ah);
 281
 282                 ipoib_neigh_free(dev, neigh);
 283         }
 284
 285         spin_unlock_irqrestore(&priv->lock, flags);
 286
 287         if (path->ah)
 288                 ipoib_put_ah(path->ah);
 289
 290         kfree(path);
 291 }
 292
 293 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 294
 295 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 296 {
 297         struct ipoib_path_iter *iter;
 298
 299         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 300         if (!iter)
 301                 return NULL;
 302
 303         iter->dev = dev;
 304         memset(iter->path.pathrec.dgid.raw, 0, 16);
 305
 306         if (ipoib_path_iter_next(iter)) {
 307                 kfree(iter);
 308                 return NULL;
 309         }
 310
 311         return iter;
 312 }
 313
 314 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 315 {
 316         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 317         struct rb_node *n;
 318         struct ipoib_path *path;
 319         int ret = 1;
 320
 321         spin_lock_irq(&priv->lock);
 322
 323         n = rb_first(&priv->path_tree);
 324
 325         while (n) {
 326                 path = rb_entry(n, struct ipoib_path, rb_node);
 327
 328                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 329                            sizeof (union ib_gid)) < 0) {
 330                         iter->path = *path;
 331                         ret = 0;
 332                         break;
 333                 }
 334
 335                 n = rb_next(n);
 336         }
 337
 338         spin_unlock_irq(&priv->lock);
 339
 340         return ret;
 341 }
 342
 343 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 344                           struct ipoib_path *path)
 345 {
 346         *path = iter->path;
 347 }
 348
 349 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 350
 351 void ipoib_flush_paths(struct net_device *dev)
 352 {
 353         struct ipoib_dev_priv *priv = netdev_priv(dev);
 354         struct ipoib_path *path, *tp;
 355         LIST_HEAD(remove_list);
 356
 357         spin_lock_irq(&priv->tx_lock);
 358         spin_lock(&priv->lock);
 359
 360         list_splice_init(&priv->path_list, &remove_list);
 361
 362         list_for_each_entry(path, &remove_list, list)
 363                 rb_erase(&path->rb_node, &priv->path_tree);
 364
 365         list_for_each_entry_safe(path, tp, &remove_list, list) {
 366                 if (path->query)
 367                         ib_sa_cancel_query(path->query_id, path->query);
 368                 spin_unlock(&priv->lock);
 369                 spin_unlock_irq(&priv->tx_lock);
 370                 wait_for_completion(&path->done);
 371                 path_free(dev, path);
 372                 spin_lock_irq(&priv->tx_lock);
 373                 spin_lock(&priv->lock);
 374         }
 375         spin_unlock(&priv->lock);
 376         spin_unlock_irq(&priv->tx_lock);
 377 }
 378
 379 static void path_rec_completion(int status,
 380                                 struct ib_sa_path_rec *pathrec,
 381                                 void *path_ptr)
 382 {
 383         struct ipoib_path *path = path_ptr;
 384         struct net_device *dev = path->dev;
 385         struct ipoib_dev_priv *priv = netdev_priv(dev);
 386         struct ipoib_ah *ah = NULL;
 387         struct ipoib_neigh *neigh, *tn;
 388         struct sk_buff_head skqueue;
 389         struct sk_buff *skb;
 390         unsigned long flags;
 391
 392         if (!status)
 393                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 394                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 395         else
 396                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 397                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 398
 399         skb_queue_head_init(&skqueue);
 400
 401         if (!status) {
 402                 struct ib_ah_attr av;
 403
 404                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 405                         ah = ipoib_create_ah(dev, priv->pd, &av);
 406         }
 407
 408         spin_lock_irqsave(&priv->lock, flags);
 409
 410         path->ah = ah;
 411
 412         if (ah) {
 413                 path->pathrec = *pathrec;
 414
 415                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 416                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 417
 418                 while ((skb = __skb_dequeue(&path->queue)))
 419                         __skb_queue_tail(&skqueue, skb);
 420
 421                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 422                         kref_get(&path->ah->ref);
 423                         neigh->ah = path->ah;
 424                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 425                                sizeof(union ib_gid));
 426
 427                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 428                                 if (!ipoib_cm_get(neigh))
 429                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 430                                                                                path,
 431                                                                                neigh));
 432                                 if (!ipoib_cm_get(neigh)) {
 433                                         list_del(&neigh->list);
 434                                         if (neigh->ah)
 435                                                 ipoib_put_ah(neigh->ah);
 436                                         ipoib_neigh_free(dev, neigh);
 437                                         continue;
 438                                 }
 439                         }
 440
 441                         while ((skb = __skb_dequeue(&neigh->queue)))
 442                                 __skb_queue_tail(&skqueue, skb);
 443                 }
 444         }
 445
 446         path->query = NULL;
 447         complete(&path->done);
 448
 449         spin_unlock_irqrestore(&priv->lock, flags);
 450
 451         while ((skb = __skb_dequeue(&skqueue))) {
 452                 skb->dev = dev;
 453                 if (dev_queue_xmit(skb))
 454                         ipoib_warn(priv, "dev_queue_xmit failed "
 455                                    "to requeue packet\n");
 456         }
 457 }
 458
 459 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 460 {
 461         struct ipoib_dev_priv *priv = netdev_priv(dev);
 462         struct ipoib_path *path;
 463
 464         if (!priv->broadcast)
 465                 return NULL;
 466
 467         path = kzalloc(sizeof *path, GFP_ATOMIC);
 468         if (!path)
 469                 return NULL;
 470
 471         path->dev = dev;
 472
 473         skb_queue_head_init(&path->queue);
 474
 475         INIT_LIST_HEAD(&path->neigh_list);
 476
 477         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 478         path->pathrec.sgid          = priv->local_gid;
 479         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 480         path->pathrec.numb_path     = 1;
 481         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 482
 483         return path;
 484 }
 485
 486 static int path_rec_start(struct net_device *dev,
 487                           struct ipoib_path *path)
 488 {
 489         struct ipoib_dev_priv *priv = netdev_priv(dev);
 490
 491         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 492                   IPOIB_GID_ARG(path->pathrec.dgid));
 493
 494         init_completion(&path->done);
 495
 496         path->query_id =
 497                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 498                                    &path->pathrec,
 499                                    IB_SA_PATH_REC_DGID          |
 500                                    IB_SA_PATH_REC_SGID          |
 501                                    IB_SA_PATH_REC_NUMB_PATH     |
 502                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 503                                    IB_SA_PATH_REC_PKEY,
 504                                    1000, GFP_ATOMIC,
 505                                    path_rec_completion,
 506                                    path, &path->query);
 507         if (path->query_id < 0) {
 508                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 509                 path->query = NULL;
 510                 return path->query_id;
 511         }
 512
 513         return 0;
 514 }
 515
 516 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 517 {
 518         struct ipoib_dev_priv *priv = netdev_priv(dev);
 519         struct ipoib_path *path;
 520         struct ipoib_neigh *neigh;
 521
 522         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 523         if (!neigh) {
 524                 ++dev->stats.tx_dropped;
 525                 dev_kfree_skb_any(skb);
 526                 return;
 527         }
 528
 529         /*
 530          * We can only be called from ipoib_start_xmit, so we're
 531          * inside tx_lock -- no need to save/restore flags.
 532          */
 533         spin_lock(&priv->lock);
 534
 535         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 536         if (!path) {
 537                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 538                 if (!path)
 539                         goto err_path;
 540
 541                 __path_add(dev, path);
 542         }
 543
 544         list_add_tail(&neigh->list, &path->neigh_list);
 545
 546         if (path->ah) {
 547                 kref_get(&path->ah->ref);
 548                 neigh->ah = path->ah;
 549                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 550                        sizeof(union ib_gid));
 551
 552                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 553                         if (!ipoib_cm_get(neigh))
 554                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 555                         if (!ipoib_cm_get(neigh)) {
 556                                 list_del(&neigh->list);
 557                                 if (neigh->ah)
 558                                         ipoib_put_ah(neigh->ah);
 559                                 ipoib_neigh_free(dev, neigh);
 560                                 goto err_drop;
 561                         }
 562                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 563                                 __skb_queue_tail(&neigh->queue, skb);
 564                         else {
 565                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 566                                            skb_queue_len(&neigh->queue));
 567                                 goto err_drop;
 568                         }
 569                 } else
 570                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 571         } else {
 572                 neigh->ah  = NULL;
 573
 574                 if (!path->query && path_rec_start(dev, path))
 575                         goto err_list;
 576
 577                 __skb_queue_tail(&neigh->queue, skb);
 578         }
 579
 580         spin_unlock(&priv->lock);
 581         return;
 582
 583 err_list:
 584         list_del(&neigh->list);
 585
 586 err_path:
 587         ipoib_neigh_free(dev, neigh);
 588 err_drop:
 589         ++dev->stats.tx_dropped;
 590         dev_kfree_skb_any(skb);
 591
 592         spin_unlock(&priv->lock);
 593 }
 594
 595 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 596 {
 597         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 598
 599         /* Look up path record for unicasts */
 600         if (skb->dst->neighbour->ha[4] != 0xff) {
 601                 neigh_add_path(skb, dev);
 602                 return;
 603         }
 604
 605         /* Add in the P_Key for multicasts */
 606         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 607         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 608         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 609 }
 610
 611 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 612                              struct ipoib_pseudoheader *phdr)
 613 {
 614         struct ipoib_dev_priv *priv = netdev_priv(dev);
 615         struct ipoib_path *path;
 616
 617         /*
 618          * We can only be called from ipoib_start_xmit, so we're
 619          * inside tx_lock -- no need to save/restore flags.
 620          */
 621         spin_lock(&priv->lock);
 622
 623         path = __path_find(dev, phdr->hwaddr + 4);
 624         if (!path) {
 625                 path = path_rec_create(dev, phdr->hwaddr + 4);
 626                 if (path) {
 627                         /* put pseudoheader back on for next time */
 628                         skb_push(skb, sizeof *phdr);
 629                         __skb_queue_tail(&path->queue, skb);
 630
 631                         if (path_rec_start(dev, path)) {
 632                                 spin_unlock(&priv->lock);
 633                                 path_free(dev, path);
 634                                 return;
 635                         } else
 636                                 __path_add(dev, path);
 637                 } else {
 638                         ++dev->stats.tx_dropped;
 639                         dev_kfree_skb_any(skb);
 640                 }
 641
 642                 spin_unlock(&priv->lock);
 643                 return;
 644         }
 645
 646         if (path->ah) {
 647                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 648                           be16_to_cpu(path->pathrec.dlid));
 649
 650                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 651         } else if ((path->query || !path_rec_start(dev, path)) &&
 652                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 653                 /* put pseudoheader back on for next time */
 654                 skb_push(skb, sizeof *phdr);
 655                 __skb_queue_tail(&path->queue, skb);
 656         } else {
 657                 ++dev->stats.tx_dropped;
 658                 dev_kfree_skb_any(skb);
 659         }
 660
 661         spin_unlock(&priv->lock);
 662 }
 663
 664 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 665 {
 666         struct ipoib_dev_priv *priv = netdev_priv(dev);
 667         struct ipoib_neigh *neigh;
 668         unsigned long flags;
 669
 670         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 671                 return NETDEV_TX_LOCKED;
 672
 673         if (likely(skb->dst && skb->dst->neighbour)) {
 674                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 675                         ipoib_path_lookup(skb, dev);
 676                         goto out;
 677                 }
 678
 679                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 680
 681                 if (neigh->ah)
 682                         if (unlikely((memcmp(&neigh->dgid.raw,
 683                                             skb->dst->neighbour->ha + 4,
 684                                             sizeof(union ib_gid))) ||
 685                                          (neigh->dev != dev))) {
 686                                 spin_lock(&priv->lock);
 687                                 /*
 688                                  * It's safe to call ipoib_put_ah() inside
 689                                  * priv->lock here, because we know that
 690                                  * path->ah will always hold one more reference,
 691                                  * so ipoib_put_ah() will never do more than
 692                                  * decrement the ref count.
 693                                  */
 694                                 ipoib_put_ah(neigh->ah);
 695                                 list_del(&neigh->list);
 696                                 ipoib_neigh_free(dev, neigh);
 697                                 spin_unlock(&priv->lock);
 698                                 ipoib_path_lookup(skb, dev);
 699                                 goto out;
 700                         }
 701
 702                 if (ipoib_cm_get(neigh)) {
 703                         if (ipoib_cm_up(neigh)) {
 704                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 705                                 goto out;
 706                         }
 707                 } else if (neigh->ah) {
 708                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 709                         goto out;
 710                 }
 711
 712                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 713                         spin_lock(&priv->lock);
 714                         __skb_queue_tail(&neigh->queue, skb);
 715                         spin_unlock(&priv->lock);
 716                 } else {
 717                         ++dev->stats.tx_dropped;
 718                         dev_kfree_skb_any(skb);
 719                 }
 720         } else {
 721                 struct ipoib_pseudoheader *phdr =
 722                         (struct ipoib_pseudoheader *) skb->data;
 723                 skb_pull(skb, sizeof *phdr);
 724
 725                 if (phdr->hwaddr[4] == 0xff) {
 726                         /* Add in the P_Key for multicast*/
 727                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 728                         phdr->hwaddr[9] = priv->pkey & 0xff;
 729
 730                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 731                 } else {
 732                         /* unicast GID -- should be ARP or RARP reply */
 733
 734                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 735                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 736                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 737                                            IPOIB_GID_FMT "\n",
 738                                            skb->dst ? "neigh" : "dst",
 739                                            be16_to_cpup((__be16 *) skb->data),
 740                                            IPOIB_QPN(phdr->hwaddr),
 741                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 742                                 dev_kfree_skb_any(skb);
 743                                 ++dev->stats.tx_dropped;
 744                                 goto out;
 745                         }
 746
 747                         unicast_arp_send(skb, dev, phdr);
 748                 }
 749         }
 750
 751 out:
 752         spin_unlock_irqrestore(&priv->tx_lock, flags);
 753
 754         return NETDEV_TX_OK;
 755 }
 756
 757 static void ipoib_timeout(struct net_device *dev)
 758 {
 759         struct ipoib_dev_priv *priv = netdev_priv(dev);
 760
 761         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 762                    jiffies_to_msecs(jiffies - dev->trans_start));
 763         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 764                    netif_queue_stopped(dev),
 765                    priv->tx_head, priv->tx_tail);
 766         /* XXX reset QP, etc. */
 767 }
 768
 769 static int ipoib_hard_header(struct sk_buff *skb,
 770                              struct net_device *dev,
 771                              unsigned short type,
 772                              const void *daddr, const void *saddr, unsigned len)
 773 {
 774         struct ipoib_header *header;
 775
 776         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 777
 778         header->proto = htons(type);
 779         header->reserved = 0;
 780
 781         /*
 782          * If we don't have a neighbour structure, stuff the
 783          * destination address onto the front of the skb so we can
 784          * figure out where to send the packet later.
 785          */
 786         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 787                 struct ipoib_pseudoheader *phdr =
 788                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 789                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 790         }
 791
 792         return 0;
 793 }
 794
 795 static void ipoib_set_mcast_list(struct net_device *dev)
 796 {
 797         struct ipoib_dev_priv *priv = netdev_priv(dev);
 798
 799         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 800                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 801                 return;
 802         }
 803
 804         queue_work(ipoib_workqueue, &priv->restart_task);
 805 }
 806
 807 static void ipoib_neigh_cleanup(struct neighbour *n)
 808 {
 809         struct ipoib_neigh *neigh;
 810         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 811         unsigned long flags;
 812         struct ipoib_ah *ah = NULL;
 813
 814         neigh = *to_ipoib_neigh(n);
 815         if (neigh)
 816                 priv = netdev_priv(neigh->dev);
 817         else
 818                 return;
 819         ipoib_dbg(priv,
 820                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 821                   IPOIB_QPN(n->ha),
 822                   IPOIB_GID_RAW_ARG(n->ha + 4));
 823
 824         spin_lock_irqsave(&priv->lock, flags);
 825
 826         if (neigh->ah)
 827                 ah = neigh->ah;
 828         list_del(&neigh->list);
 829         ipoib_neigh_free(n->dev, neigh);
 830
 831         spin_unlock_irqrestore(&priv->lock, flags);
 832
 833         if (ah)
 834                 ipoib_put_ah(ah);
 835 }
 836
 837 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 838                                       struct net_device *dev)
 839 {
 840         struct ipoib_neigh *neigh;
 841
 842         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 843         if (!neigh)
 844                 return NULL;
 845
 846         neigh->neighbour = neighbour;
 847         neigh->dev = dev;
 848         *to_ipoib_neigh(neighbour) = neigh;
 849         skb_queue_head_init(&neigh->queue);
 850         ipoib_cm_set(neigh, NULL);
 851
 852         return neigh;
 853 }
 854
 855 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 856 {
 857         struct sk_buff *skb;
 858         *to_ipoib_neigh(neigh->neighbour) = NULL;
 859         while ((skb = __skb_dequeue(&neigh->queue))) {
 860                 ++dev->stats.tx_dropped;
 861                 dev_kfree_skb_any(skb);
 862         }
 863         if (ipoib_cm_get(neigh))
 864                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 865         kfree(neigh);
 866 }
 867
 868 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 869 {
 870         parms->neigh_cleanup = ipoib_neigh_cleanup;
 871
 872         return 0;
 873 }
 874
 875 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 876 {
 877         struct ipoib_dev_priv *priv = netdev_priv(dev);
 878
 879         /* Allocate RX/TX "rings" to hold queued skbs */
 880         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 881                                 GFP_KERNEL);
 882         if (!priv->rx_ring) {
 883                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 884                        ca->name, ipoib_recvq_size);
 885                 goto out;
 886         }
 887
 888         priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
 889         if (!priv->tx_ring) {
 890                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 891                        ca->name, ipoib_sendq_size);
 892                 goto out_rx_ring_cleanup;
 893         }
 894         memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
 895
 896         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 897
 898         if (ipoib_ib_dev_init(dev, ca, port))
 899                 goto out_tx_ring_cleanup;
 900
 901         return 0;
 902
 903 out_tx_ring_cleanup:
 904         vfree(priv->tx_ring);
 905
 906 out_rx_ring_cleanup:
 907         kfree(priv->rx_ring);
 908
 909 out:
 910         return -ENOMEM;
 911 }
 912
 913 void ipoib_dev_cleanup(struct net_device *dev)
 914 {
 915         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 916
 917         ipoib_delete_debug_files(dev);
 918
 919         /* Delete any child interfaces first */
 920         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 921                 unregister_netdev(cpriv->dev);
 922                 ipoib_dev_cleanup(cpriv->dev);
 923                 free_netdev(cpriv->dev);
 924         }
 925
 926         ipoib_ib_dev_cleanup(dev);
 927
 928         kfree(priv->rx_ring);
 929         vfree(priv->tx_ring);
 930
 931         priv->rx_ring = NULL;
 932         priv->tx_ring = NULL;
 933 }
 934
 935 static const struct header_ops ipoib_header_ops = {
 936         .create = ipoib_hard_header,
 937 };
 938
 939 static void ipoib_setup(struct net_device *dev)
 940 {
 941         struct ipoib_dev_priv *priv = netdev_priv(dev);
 942
 943         dev->open                = ipoib_open;
 944         dev->stop                = ipoib_stop;
 945         dev->change_mtu          = ipoib_change_mtu;
 946         dev->hard_start_xmit     = ipoib_start_xmit;
 947         dev->tx_timeout          = ipoib_timeout;
 948         dev->header_ops          = &ipoib_header_ops;
 949         dev->set_multicast_list  = ipoib_set_mcast_list;
 950         dev->neigh_setup         = ipoib_neigh_setup_dev;
 951
 952         ipoib_set_ethtool_ops(dev);
 953
 954         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
 955
 956         dev->watchdog_timeo      = HZ;
 957
 958         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 959
 960         /*
 961          * We add in INFINIBAND_ALEN to allow for the destination
 962          * address "pseudoheader" for skbs without neighbour struct.
 963          */
 964         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 965         dev->addr_len            = INFINIBAND_ALEN;
 966         dev->type                = ARPHRD_INFINIBAND;
 967         dev->tx_queue_len        = ipoib_sendq_size * 2;
 968         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
 969                                     NETIF_F_LLTX                |
 970                                     NETIF_F_HIGHDMA);
 971
 972         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 973
 974         netif_carrier_off(dev);
 975
 976         priv->dev = dev;
 977
 978         spin_lock_init(&priv->lock);
 979         spin_lock_init(&priv->tx_lock);
 980
 981         mutex_init(&priv->mcast_mutex);
 982         mutex_init(&priv->vlan_mutex);
 983
 984         INIT_LIST_HEAD(&priv->path_list);
 985         INIT_LIST_HEAD(&priv->child_intfs);
 986         INIT_LIST_HEAD(&priv->dead_ahs);
 987         INIT_LIST_HEAD(&priv->multicast_list);
 988
 989         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
 990         INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
 991         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 992         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
 993         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
 994         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
 995 }
 996
 997 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
 998 {
 999         struct net_device *dev;
1000
1001         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1002                            ipoib_setup);
1003         if (!dev)
1004                 return NULL;
1005
1006         return netdev_priv(dev);
1007 }
1008
1009 static ssize_t show_pkey(struct device *dev,
1010                          struct device_attribute *attr, char *buf)
1011 {
1012         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1013
1014         return sprintf(buf, "0x%04x\n", priv->pkey);
1015 }
1016 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1017
1018 static ssize_t show_umcast(struct device *dev,
1019                            struct device_attribute *attr, char *buf)
1020 {
1021         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1022
1023         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1024 }
1025
1026 static ssize_t set_umcast(struct device *dev,
1027                           struct device_attribute *attr,
1028                           const char *buf, size_t count)
1029 {
1030         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1031         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1032
1033         if (umcast_val > 0) {
1034                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1035                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1036                                 "by userspace\n");
1037         } else
1038                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1039
1040         return count;
1041 }
1042 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1043
1044 int ipoib_add_umcast_attr(struct net_device *dev)
1045 {
1046         return device_create_file(&dev->dev, &dev_attr_umcast);
1047 }
1048
1049 static ssize_t create_child(struct device *dev,
1050                             struct device_attribute *attr,
1051                             const char *buf, size_t count)
1052 {
1053         int pkey;
1054         int ret;
1055
1056         if (sscanf(buf, "%i", &pkey) != 1)
1057                 return -EINVAL;
1058
1059         if (pkey < 0 || pkey > 0xffff)
1060                 return -EINVAL;
1061
1062         /*
1063          * Set the full membership bit, so that we join the right
1064          * broadcast group, etc.
1065          */
1066         pkey |= 0x8000;
1067
1068         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1069
1070         return ret ? ret : count;
1071 }
1072 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1073
1074 static ssize_t delete_child(struct device *dev,
1075                             struct device_attribute *attr,
1076                             const char *buf, size_t count)
1077 {
1078         int pkey;
1079         int ret;
1080
1081         if (sscanf(buf, "%i", &pkey) != 1)
1082                 return -EINVAL;
1083
1084         if (pkey < 0 || pkey > 0xffff)
1085                 return -EINVAL;
1086
1087         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1088
1089         return ret ? ret : count;
1090
1091 }
1092 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1093
1094 int ipoib_add_pkey_attr(struct net_device *dev)
1095 {
1096         return device_create_file(&dev->dev, &dev_attr_pkey);
1097 }
1098
1099 static struct net_device *ipoib_add_port(const char *format,
1100                                          struct ib_device *hca, u8 port)
1101 {
1102         struct ipoib_dev_priv *priv;
1103         struct ib_device_attr *device_attr;
1104         struct ib_port_attr attr;
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         if (!ib_query_port(hca, port, &attr))
1114                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1115         else {
1116                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1117                        hca->name, port);
1118                 goto device_init_failed;
1119         }
1120
1121         /* MTU will be reset when mcast join happens */
1122         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1123         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1124
1125         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1126         if (result) {
1127                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1128                        hca->name, port, result);
1129                 goto device_init_failed;
1130         }
1131
1132         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1133         if (!device_attr) {
1134                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1135                        hca->name, sizeof *device_attr);
1136                 goto device_init_failed;
1137         }
1138
1139         result = ib_query_device(hca, device_attr);
1140         if (result) {
1141                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1142                        hca->name, result);
1143                 kfree(device_attr);
1144                 goto device_init_failed;
1145         }
1146         priv->hca_caps = device_attr->device_cap_flags;
1147
1148         kfree(device_attr);
1149
1150         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1151                 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1152                 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1153         }
1154
1155         /*
1156          * Set the full membership bit, so that we join the right
1157          * broadcast group, etc.
1158          */
1159         priv->pkey |= 0x8000;
1160
1161         priv->dev->broadcast[8] = priv->pkey >> 8;
1162         priv->dev->broadcast[9] = priv->pkey & 0xff;
1163
1164         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1165         if (result) {
1166                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1167                        hca->name, port, result);
1168                 goto device_init_failed;
1169         } else
1170                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1171
1172         result = ipoib_dev_init(priv->dev, hca, port);
1173         if (result < 0) {
1174                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1175                        hca->name, port, result);
1176                 goto device_init_failed;
1177         }
1178
1179         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1180                               priv->ca, ipoib_event);
1181         result = ib_register_event_handler(&priv->event_handler);
1182         if (result < 0) {
1183                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1184                        "port %d (ret = %d)\n",
1185                        hca->name, port, result);
1186                 goto event_failed;
1187         }
1188
1189         if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1190                 priv->dev->features |= NETIF_F_TSO;
1191
1192         result = register_netdev(priv->dev);
1193         if (result) {
1194                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1195                        hca->name, port, result);
1196                 goto register_failed;
1197         }
1198
1199         ipoib_create_debug_files(priv->dev);
1200
1201         if (ipoib_cm_add_mode_attr(priv->dev))
1202                 goto sysfs_failed;
1203         if (ipoib_add_pkey_attr(priv->dev))
1204                 goto sysfs_failed;
1205         if (ipoib_add_umcast_attr(priv->dev))
1206                 goto sysfs_failed;
1207         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1208                 goto sysfs_failed;
1209         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1210                 goto sysfs_failed;
1211
1212         return priv->dev;
1213
1214 sysfs_failed:
1215         ipoib_delete_debug_files(priv->dev);
1216         unregister_netdev(priv->dev);
1217
1218 register_failed:
1219         ib_unregister_event_handler(&priv->event_handler);
1220         flush_scheduled_work();
1221
1222 event_failed:
1223         ipoib_dev_cleanup(priv->dev);
1224
1225 device_init_failed:
1226         free_netdev(priv->dev);
1227
1228 alloc_mem_failed:
1229         return ERR_PTR(result);
1230 }
1231
1232 static void ipoib_add_one(struct ib_device *device)
1233 {
1234         struct list_head *dev_list;
1235         struct net_device *dev;
1236         struct ipoib_dev_priv *priv;
1237         int s, e, p;
1238
1239         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1240                 return;
1241
1242         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1243         if (!dev_list)
1244                 return;
1245
1246         INIT_LIST_HEAD(dev_list);
1247
1248         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1249                 s = 0;
1250                 e = 0;
1251         } else {
1252                 s = 1;
1253                 e = device->phys_port_cnt;
1254         }
1255
1256         for (p = s; p <= e; ++p) {
1257                 dev = ipoib_add_port("ib%d", device, p);
1258                 if (!IS_ERR(dev)) {
1259                         priv = netdev_priv(dev);
1260                         list_add_tail(&priv->list, dev_list);
1261                 }
1262         }
1263
1264         ib_set_client_data(device, &ipoib_client, dev_list);
1265 }
1266
1267 static void ipoib_remove_one(struct ib_device *device)
1268 {
1269         struct ipoib_dev_priv *priv, *tmp;
1270         struct list_head *dev_list;
1271
1272         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1273                 return;
1274
1275         dev_list = ib_get_client_data(device, &ipoib_client);
1276
1277         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1278                 ib_unregister_event_handler(&priv->event_handler);
1279                 flush_scheduled_work();
1280
1281                 unregister_netdev(priv->dev);
1282                 ipoib_dev_cleanup(priv->dev);
1283                 free_netdev(priv->dev);
1284         }
1285
1286         kfree(dev_list);
1287 }
1288
1289 static int __init ipoib_init_module(void)
1290 {
1291         int ret;
1292
1293         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1294         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1295         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1296
1297         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1298         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1299         ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
1300                                                      IPOIB_MIN_QUEUE_SIZE));
1301 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1302         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1303 #endif
1304
1305         /*
1306          * When copying small received packets, we only copy from the
1307          * linear data part of the SKB, so we rely on this condition.
1308          */
1309         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1310
1311         ret = ipoib_register_debugfs();
1312         if (ret)
1313                 return ret;
1314
1315         /*
1316          * We create our own workqueue mainly because we want to be
1317          * able to flush it when devices are being removed.  We can't
1318          * use schedule_work()/flush_scheduled_work() because both
1319          * unregister_netdev() and linkwatch_event take the rtnl lock,
1320          * so flush_scheduled_work() can deadlock during device
1321          * removal.
1322          */
1323         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1324         if (!ipoib_workqueue) {
1325                 ret = -ENOMEM;
1326                 goto err_fs;
1327         }
1328
1329         ib_sa_register_client(&ipoib_sa_client);
1330
1331         ret = ib_register_client(&ipoib_client);
1332         if (ret)
1333                 goto err_sa;
1334
1335         return 0;
1336
1337 err_sa:
1338         ib_sa_unregister_client(&ipoib_sa_client);
1339         destroy_workqueue(ipoib_workqueue);
1340
1341 err_fs:
1342         ipoib_unregister_debugfs();
1343
1344         return ret;
1345 }
1346
1347 static void __exit ipoib_cleanup_module(void)
1348 {
1349         ib_unregister_client(&ipoib_client);
1350         ib_sa_unregister_client(&ipoib_sa_client);
1351         ipoib_unregister_debugfs();
1352         destroy_workqueue(ipoib_workqueue);
1353 }
1354
1355 module_init(ipoib_init_module);
1356 module_exit(ipoib_cleanup_module);