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         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 101
 102         if (ipoib_pkey_dev_delay_open(dev))
 103                 return 0;
 104
 105         if (ipoib_ib_dev_open(dev))
 106                 goto err_disable;
 107
 108         if (ipoib_ib_dev_up(dev))
 109                 goto err_stop;
 110
 111         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 112                 struct ipoib_dev_priv *cpriv;
 113
 114                 /* Bring up any child interfaces too */
 115                 mutex_lock(&priv->vlan_mutex);
 116                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 117                         int flags;
 118
 119                         flags = cpriv->dev->flags;
 120                         if (flags & IFF_UP)
 121                                 continue;
 122
 123                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 124                 }
 125                 mutex_unlock(&priv->vlan_mutex);
 126         }
 127
 128         netif_start_queue(dev);
 129
 130         return 0;
 131
 132 err_stop:
 133         ipoib_ib_dev_stop(dev, 1);
 134
 135 err_disable:
 136         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 137
 138         return -EINVAL;
 139 }
 140
 141 static int ipoib_stop(struct net_device *dev)
 142 {
 143         struct ipoib_dev_priv *priv = netdev_priv(dev);
 144
 145         ipoib_dbg(priv, "stopping interface\n");
 146
 147         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 148
 149         netif_stop_queue(dev);
 150
 151         ipoib_ib_dev_down(dev, 0);
 152         ipoib_ib_dev_stop(dev, 0);
 153
 154         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 155                 struct ipoib_dev_priv *cpriv;
 156
 157                 /* Bring down any child interfaces too */
 158                 mutex_lock(&priv->vlan_mutex);
 159                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 160                         int flags;
 161
 162                         flags = cpriv->dev->flags;
 163                         if (!(flags & IFF_UP))
 164                                 continue;
 165
 166                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 167                 }
 168                 mutex_unlock(&priv->vlan_mutex);
 169         }
 170
 171         return 0;
 172 }
 173
 174 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 175 {
 176         struct ipoib_dev_priv *priv = netdev_priv(dev);
 177
 178         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 179                 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
 180
 181         return features;
 182 }
 183
 184 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 185 {
 186         struct ipoib_dev_priv *priv = netdev_priv(dev);
 187
 188         /* dev->mtu > 2K ==> connected mode */
 189         if (ipoib_cm_admin_enabled(dev)) {
 190                 if (new_mtu > ipoib_cm_max_mtu(dev))
 191                         return -EINVAL;
 192
 193                 if (new_mtu > priv->mcast_mtu)
 194                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 195                                    priv->mcast_mtu);
 196
 197                 dev->mtu = new_mtu;
 198                 return 0;
 199         }
 200
 201         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 202                 return -EINVAL;
 203
 204         priv->admin_mtu = new_mtu;
 205
 206         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 207
 208         return 0;
 209 }
 210
 211 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 212 {
 213         struct ipoib_dev_priv *priv = netdev_priv(dev);
 214         struct rb_node *n = priv->path_tree.rb_node;
 215         struct ipoib_path *path;
 216         int ret;
 217
 218         while (n) {
 219                 path = rb_entry(n, struct ipoib_path, rb_node);
 220
 221                 ret = memcmp(gid, path->pathrec.dgid.raw,
 222                              sizeof (union ib_gid));
 223
 224                 if (ret < 0)
 225                         n = n->rb_left;
 226                 else if (ret > 0)
 227                         n = n->rb_right;
 228                 else
 229                         return path;
 230         }
 231
 232         return NULL;
 233 }
 234
 235 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 236 {
 237         struct ipoib_dev_priv *priv = netdev_priv(dev);
 238         struct rb_node **n = &priv->path_tree.rb_node;
 239         struct rb_node *pn = NULL;
 240         struct ipoib_path *tpath;
 241         int ret;
 242
 243         while (*n) {
 244                 pn = *n;
 245                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 246
 247                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 248                              sizeof (union ib_gid));
 249                 if (ret < 0)
 250                         n = &pn->rb_left;
 251                 else if (ret > 0)
 252                         n = &pn->rb_right;
 253                 else
 254                         return -EEXIST;
 255         }
 256
 257         rb_link_node(&path->rb_node, pn, n);
 258         rb_insert_color(&path->rb_node, &priv->path_tree);
 259
 260         list_add_tail(&path->list, &priv->path_list);
 261
 262         return 0;
 263 }
 264
 265 static void path_free(struct net_device *dev, struct ipoib_path *path)
 266 {
 267         struct ipoib_dev_priv *priv = netdev_priv(dev);
 268         struct ipoib_neigh *neigh, *tn;
 269         struct sk_buff *skb;
 270         unsigned long flags;
 271
 272         while ((skb = __skb_dequeue(&path->queue)))
 273                 dev_kfree_skb_irq(skb);
 274
 275         spin_lock_irqsave(&priv->lock, flags);
 276
 277         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 278                 /*
 279                  * It's safe to call ipoib_put_ah() inside priv->lock
 280                  * here, because we know that path->ah will always
 281                  * hold one more reference, so ipoib_put_ah() will
 282                  * never do more than decrement the ref count.
 283                  */
 284                 if (neigh->ah)
 285                         ipoib_put_ah(neigh->ah);
 286
 287                 ipoib_neigh_free(dev, neigh);
 288         }
 289
 290         spin_unlock_irqrestore(&priv->lock, flags);
 291
 292         if (path->ah)
 293                 ipoib_put_ah(path->ah);
 294
 295         kfree(path);
 296 }
 297
 298 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 299
 300 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 301 {
 302         struct ipoib_path_iter *iter;
 303
 304         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 305         if (!iter)
 306                 return NULL;
 307
 308         iter->dev = dev;
 309         memset(iter->path.pathrec.dgid.raw, 0, 16);
 310
 311         if (ipoib_path_iter_next(iter)) {
 312                 kfree(iter);
 313                 return NULL;
 314         }
 315
 316         return iter;
 317 }
 318
 319 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 320 {
 321         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 322         struct rb_node *n;
 323         struct ipoib_path *path;
 324         int ret = 1;
 325
 326         spin_lock_irq(&priv->lock);
 327
 328         n = rb_first(&priv->path_tree);
 329
 330         while (n) {
 331                 path = rb_entry(n, struct ipoib_path, rb_node);
 332
 333                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 334                            sizeof (union ib_gid)) < 0) {
 335                         iter->path = *path;
 336                         ret = 0;
 337                         break;
 338                 }
 339
 340                 n = rb_next(n);
 341         }
 342
 343         spin_unlock_irq(&priv->lock);
 344
 345         return ret;
 346 }
 347
 348 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 349                           struct ipoib_path *path)
 350 {
 351         *path = iter->path;
 352 }
 353
 354 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 355
 356 void ipoib_mark_paths_invalid(struct net_device *dev)
 357 {
 358         struct ipoib_dev_priv *priv = netdev_priv(dev);
 359         struct ipoib_path *path, *tp;
 360
 361         spin_lock_irq(&priv->lock);
 362
 363         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 364                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
 365                         be16_to_cpu(path->pathrec.dlid),
 366                         path->pathrec.dgid.raw);
 367                 path->valid =  0;
 368         }
 369
 370         spin_unlock_irq(&priv->lock);
 371 }
 372
 373 void ipoib_flush_paths(struct net_device *dev)
 374 {
 375         struct ipoib_dev_priv *priv = netdev_priv(dev);
 376         struct ipoib_path *path, *tp;
 377         LIST_HEAD(remove_list);
 378         unsigned long flags;
 379
 380         netif_tx_lock_bh(dev);
 381         spin_lock_irqsave(&priv->lock, flags);
 382
 383         list_splice_init(&priv->path_list, &remove_list);
 384
 385         list_for_each_entry(path, &remove_list, list)
 386                 rb_erase(&path->rb_node, &priv->path_tree);
 387
 388         list_for_each_entry_safe(path, tp, &remove_list, list) {
 389                 if (path->query)
 390                         ib_sa_cancel_query(path->query_id, path->query);
 391                 spin_unlock_irqrestore(&priv->lock, flags);
 392                 netif_tx_unlock_bh(dev);
 393                 wait_for_completion(&path->done);
 394                 path_free(dev, path);
 395                 netif_tx_lock_bh(dev);
 396                 spin_lock_irqsave(&priv->lock, flags);
 397         }
 398
 399         spin_unlock_irqrestore(&priv->lock, flags);
 400         netif_tx_unlock_bh(dev);
 401 }
 402
 403 static void path_rec_completion(int status,
 404                                 struct ib_sa_path_rec *pathrec,
 405                                 void *path_ptr)
 406 {
 407         struct ipoib_path *path = path_ptr;
 408         struct net_device *dev = path->dev;
 409         struct ipoib_dev_priv *priv = netdev_priv(dev);
 410         struct ipoib_ah *ah = NULL;
 411         struct ipoib_ah *old_ah = NULL;
 412         struct ipoib_neigh *neigh, *tn;
 413         struct sk_buff_head skqueue;
 414         struct sk_buff *skb;
 415         unsigned long flags;
 416
 417         if (!status)
 418                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 419                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
 420         else
 421                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 422                           status, path->pathrec.dgid.raw);
 423
 424         skb_queue_head_init(&skqueue);
 425
 426         if (!status) {
 427                 struct ib_ah_attr av;
 428
 429                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 430                         ah = ipoib_create_ah(dev, priv->pd, &av);
 431         }
 432
 433         spin_lock_irqsave(&priv->lock, flags);
 434
 435         if (!IS_ERR_OR_NULL(ah)) {
 436                 path->pathrec = *pathrec;
 437
 438                 old_ah   = path->ah;
 439                 path->ah = ah;
 440
 441                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 442                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 443
 444                 while ((skb = __skb_dequeue(&path->queue)))
 445                         __skb_queue_tail(&skqueue, skb);
 446
 447                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 448                         if (neigh->ah) {
 449                                 WARN_ON(neigh->ah != old_ah);
 450                                 /*
 451                                  * Dropping the ah reference inside
 452                                  * priv->lock is safe here, because we
 453                                  * will hold one more reference from
 454                                  * the original value of path->ah (ie
 455                                  * old_ah).
 456                                  */
 457                                 ipoib_put_ah(neigh->ah);
 458                         }
 459                         kref_get(&path->ah->ref);
 460                         neigh->ah = path->ah;
 461                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 462                                sizeof(union ib_gid));
 463
 464                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 465                                 if (!ipoib_cm_get(neigh))
 466                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 467                                                                                path,
 468                                                                                neigh));
 469                                 if (!ipoib_cm_get(neigh)) {
 470                                         list_del(&neigh->list);
 471                                         if (neigh->ah)
 472                                                 ipoib_put_ah(neigh->ah);
 473                                         ipoib_neigh_free(dev, neigh);
 474                                         continue;
 475                                 }
 476                         }
 477
 478                         while ((skb = __skb_dequeue(&neigh->queue)))
 479                                 __skb_queue_tail(&skqueue, skb);
 480                 }
 481                 path->valid = 1;
 482         }
 483
 484         path->query = NULL;
 485         complete(&path->done);
 486
 487         spin_unlock_irqrestore(&priv->lock, flags);
 488
 489         if (old_ah)
 490                 ipoib_put_ah(old_ah);
 491
 492         while ((skb = __skb_dequeue(&skqueue))) {
 493                 skb->dev = dev;
 494                 if (dev_queue_xmit(skb))
 495                         ipoib_warn(priv, "dev_queue_xmit failed "
 496                                    "to requeue packet\n");
 497         }
 498 }
 499
 500 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 501 {
 502         struct ipoib_dev_priv *priv = netdev_priv(dev);
 503         struct ipoib_path *path;
 504
 505         if (!priv->broadcast)
 506                 return NULL;
 507
 508         path = kzalloc(sizeof *path, GFP_ATOMIC);
 509         if (!path)
 510                 return NULL;
 511
 512         path->dev = dev;
 513
 514         skb_queue_head_init(&path->queue);
 515
 516         INIT_LIST_HEAD(&path->neigh_list);
 517
 518         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 519         path->pathrec.sgid          = priv->local_gid;
 520         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 521         path->pathrec.numb_path     = 1;
 522         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 523
 524         return path;
 525 }
 526
 527 static int path_rec_start(struct net_device *dev,
 528                           struct ipoib_path *path)
 529 {
 530         struct ipoib_dev_priv *priv = netdev_priv(dev);
 531
 532         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 533                   path->pathrec.dgid.raw);
 534
 535         init_completion(&path->done);
 536
 537         path->query_id =
 538                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 539                                    &path->pathrec,
 540                                    IB_SA_PATH_REC_DGID          |
 541                                    IB_SA_PATH_REC_SGID          |
 542                                    IB_SA_PATH_REC_NUMB_PATH     |
 543                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 544                                    IB_SA_PATH_REC_PKEY,
 545                                    1000, GFP_ATOMIC,
 546                                    path_rec_completion,
 547                                    path, &path->query);
 548         if (path->query_id < 0) {
 549                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 550                 path->query = NULL;
 551                 complete(&path->done);
 552                 return path->query_id;
 553         }
 554
 555         return 0;
 556 }
 557
 558 /* called with rcu_read_lock */
 559 static void neigh_add_path(struct sk_buff *skb, struct neighbour *n, struct net_device *dev)
 560 {
 561         struct ipoib_dev_priv *priv = netdev_priv(dev);
 562         struct ipoib_path *path;
 563         struct ipoib_neigh *neigh;
 564         unsigned long flags;
 565
 566         neigh = ipoib_neigh_alloc(n, skb->dev);
 567         if (!neigh) {
 568                 ++dev->stats.tx_dropped;
 569                 dev_kfree_skb_any(skb);
 570                 return;
 571         }
 572
 573         spin_lock_irqsave(&priv->lock, flags);
 574
 575         path = __path_find(dev, n->ha + 4);
 576         if (!path) {
 577                 path = path_rec_create(dev, n->ha + 4);
 578                 if (!path)
 579                         goto err_path;
 580
 581                 __path_add(dev, path);
 582         }
 583
 584         list_add_tail(&neigh->list, &path->neigh_list);
 585
 586         if (path->ah) {
 587                 kref_get(&path->ah->ref);
 588                 neigh->ah = path->ah;
 589                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 590                        sizeof(union ib_gid));
 591
 592                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 593                         if (!ipoib_cm_get(neigh))
 594                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 595                         if (!ipoib_cm_get(neigh)) {
 596                                 list_del(&neigh->list);
 597                                 if (neigh->ah)
 598                                         ipoib_put_ah(neigh->ah);
 599                                 ipoib_neigh_free(dev, neigh);
 600                                 goto err_drop;
 601                         }
 602                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 603                                 __skb_queue_tail(&neigh->queue, skb);
 604                         else {
 605                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 606                                            skb_queue_len(&neigh->queue));
 607                                 goto err_drop;
 608                         }
 609                 } else {
 610                         spin_unlock_irqrestore(&priv->lock, flags);
 611                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(n->ha));
 612                         return;
 613                 }
 614         } else {
 615                 neigh->ah  = NULL;
 616
 617                 if (!path->query && path_rec_start(dev, path))
 618                         goto err_list;
 619
 620                 __skb_queue_tail(&neigh->queue, skb);
 621         }
 622
 623         spin_unlock_irqrestore(&priv->lock, flags);
 624         return;
 625
 626 err_list:
 627         list_del(&neigh->list);
 628
 629 err_path:
 630         ipoib_neigh_free(dev, neigh);
 631 err_drop:
 632         ++dev->stats.tx_dropped;
 633         dev_kfree_skb_any(skb);
 634
 635         spin_unlock_irqrestore(&priv->lock, flags);
 636 }
 637
 638 /* called with rcu_read_lock */
 639 static void ipoib_path_lookup(struct sk_buff *skb, struct neighbour *n, struct net_device *dev)
 640 {
 641         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 642
 643         /* Look up path record for unicasts */
 644         if (n->ha[4] != 0xff) {
 645                 neigh_add_path(skb, n, dev);
 646                 return;
 647         }
 648
 649         /* Add in the P_Key for multicasts */
 650         n->ha[8] = (priv->pkey >> 8) & 0xff;
 651         n->ha[9] = priv->pkey & 0xff;
 652         ipoib_mcast_send(dev, n->ha + 4, skb);
 653 }
 654
 655 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 656                              struct ipoib_cb *cb)
 657 {
 658         struct ipoib_dev_priv *priv = netdev_priv(dev);
 659         struct ipoib_path *path;
 660         unsigned long flags;
 661
 662         spin_lock_irqsave(&priv->lock, flags);
 663
 664         path = __path_find(dev, cb->hwaddr + 4);
 665         if (!path || !path->valid) {
 666                 int new_path = 0;
 667
 668                 if (!path) {
 669                         path = path_rec_create(dev, cb->hwaddr + 4);
 670                         new_path = 1;
 671                 }
 672                 if (path) {
 673                         __skb_queue_tail(&path->queue, skb);
 674
 675                         if (!path->query && path_rec_start(dev, path)) {
 676                                 spin_unlock_irqrestore(&priv->lock, flags);
 677                                 if (new_path)
 678                                         path_free(dev, path);
 679                                 return;
 680                         } else
 681                                 __path_add(dev, path);
 682                 } else {
 683                         ++dev->stats.tx_dropped;
 684                         dev_kfree_skb_any(skb);
 685                 }
 686
 687                 spin_unlock_irqrestore(&priv->lock, flags);
 688                 return;
 689         }
 690
 691         if (path->ah) {
 692                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 693                           be16_to_cpu(path->pathrec.dlid));
 694
 695                 spin_unlock_irqrestore(&priv->lock, flags);
 696                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
 697                 return;
 698         } else if ((path->query || !path_rec_start(dev, path)) &&
 699                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 700                 __skb_queue_tail(&path->queue, skb);
 701         } else {
 702                 ++dev->stats.tx_dropped;
 703                 dev_kfree_skb_any(skb);
 704         }
 705
 706         spin_unlock_irqrestore(&priv->lock, flags);
 707 }
 708
 709 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 710 {
 711         struct ipoib_dev_priv *priv = netdev_priv(dev);
 712         struct ipoib_neigh *neigh;
 713         struct neighbour *n = NULL;
 714         unsigned long flags;
 715
 716         rcu_read_lock();
 717         if (likely(skb_dst(skb))) {
 718                 n = dst_neigh_lookup_skb(skb_dst(skb), skb);
 719                 if (!n) {
 720                         ++dev->stats.tx_dropped;
 721                         dev_kfree_skb_any(skb);
 722                         goto unlock;
 723                 }
 724         }
 725         if (likely(n)) {
 726                 if (unlikely(!*to_ipoib_neigh(n))) {
 727                         ipoib_path_lookup(skb, n, dev);
 728                         goto unlock;
 729                 }
 730
 731                 neigh = *to_ipoib_neigh(n);
 732
 733                 if (unlikely((memcmp(&neigh->dgid.raw,
 734                                      n->ha + 4,
 735                                      sizeof(union ib_gid))) ||
 736                              (neigh->dev != dev))) {
 737                         spin_lock_irqsave(&priv->lock, flags);
 738                         /*
 739                          * It's safe to call ipoib_put_ah() inside
 740                          * priv->lock here, because we know that
 741                          * path->ah will always hold one more reference,
 742                          * so ipoib_put_ah() will never do more than
 743                          * decrement the ref count.
 744                          */
 745                         if (neigh->ah)
 746                                 ipoib_put_ah(neigh->ah);
 747                         list_del(&neigh->list);
 748                         ipoib_neigh_free(dev, neigh);
 749                         spin_unlock_irqrestore(&priv->lock, flags);
 750                         ipoib_path_lookup(skb, n, dev);
 751                         goto unlock;
 752                 }
 753
 754                 if (ipoib_cm_get(neigh)) {
 755                         if (ipoib_cm_up(neigh)) {
 756                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 757                                 goto unlock;
 758                         }
 759                 } else if (neigh->ah) {
 760                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(n->ha));
 761                         goto unlock;
 762                 }
 763
 764                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 765                         spin_lock_irqsave(&priv->lock, flags);
 766                         __skb_queue_tail(&neigh->queue, skb);
 767                         spin_unlock_irqrestore(&priv->lock, flags);
 768                 } else {
 769                         ++dev->stats.tx_dropped;
 770                         dev_kfree_skb_any(skb);
 771                 }
 772         } else {
 773                 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 774
 775                 if (cb->hwaddr[4] == 0xff) {
 776                         /* Add in the P_Key for multicast*/
 777                         cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 778                         cb->hwaddr[9] = priv->pkey & 0xff;
 779
 780                         ipoib_mcast_send(dev, cb->hwaddr + 4, skb);
 781                 } else {
 782                         /* unicast GID -- should be ARP or RARP reply */
 783
 784                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 785                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 786                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
 787                                            skb_dst(skb) ? "neigh" : "dst",
 788                                            be16_to_cpup((__be16 *) skb->data),
 789                                            IPOIB_QPN(cb->hwaddr),
 790                                            cb->hwaddr + 4);
 791                                 dev_kfree_skb_any(skb);
 792                                 ++dev->stats.tx_dropped;
 793                                 goto unlock;
 794                         }
 795
 796                         unicast_arp_send(skb, dev, cb);
 797                 }
 798         }
 799 unlock:
 800         if (n)
 801                 neigh_release(n);
 802         rcu_read_unlock();
 803         return NETDEV_TX_OK;
 804 }
 805
 806 static void ipoib_timeout(struct net_device *dev)
 807 {
 808         struct ipoib_dev_priv *priv = netdev_priv(dev);
 809
 810         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 811                    jiffies_to_msecs(jiffies - dev->trans_start));
 812         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 813                    netif_queue_stopped(dev),
 814                    priv->tx_head, priv->tx_tail);
 815         /* XXX reset QP, etc. */
 816 }
 817
 818 static int ipoib_hard_header(struct sk_buff *skb,
 819                              struct net_device *dev,
 820                              unsigned short type,
 821                              const void *daddr, const void *saddr, unsigned len)
 822 {
 823         struct ipoib_header *header;
 824
 825         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 826
 827         header->proto = htons(type);
 828         header->reserved = 0;
 829
 830         /*
 831          * If we don't have a dst_entry structure, stuff the
 832          * destination address into skb->cb so we can figure out where
 833          * to send the packet later.
 834          */
 835         if (!skb_dst(skb)) {
 836                 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 837                 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
 838         }
 839
 840         return 0;
 841 }
 842
 843 static void ipoib_set_mcast_list(struct net_device *dev)
 844 {
 845         struct ipoib_dev_priv *priv = netdev_priv(dev);
 846
 847         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 848                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 849                 return;
 850         }
 851
 852         queue_work(ipoib_workqueue, &priv->restart_task);
 853 }
 854
 855 static void ipoib_neigh_cleanup(struct neighbour *n)
 856 {
 857         struct ipoib_neigh *neigh;
 858         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 859         unsigned long flags;
 860         struct ipoib_ah *ah = NULL;
 861
 862         neigh = *to_ipoib_neigh(n);
 863         if (neigh)
 864                 priv = netdev_priv(neigh->dev);
 865         else
 866                 return;
 867         ipoib_dbg(priv,
 868                   "neigh_cleanup for %06x %pI6\n",
 869                   IPOIB_QPN(n->ha),
 870                   n->ha + 4);
 871
 872         spin_lock_irqsave(&priv->lock, flags);
 873
 874         if (neigh->ah)
 875                 ah = neigh->ah;
 876         list_del(&neigh->list);
 877         ipoib_neigh_free(n->dev, neigh);
 878
 879         spin_unlock_irqrestore(&priv->lock, flags);
 880
 881         if (ah)
 882                 ipoib_put_ah(ah);
 883 }
 884
 885 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 886                                       struct net_device *dev)
 887 {
 888         struct ipoib_neigh *neigh;
 889
 890         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 891         if (!neigh)
 892                 return NULL;
 893
 894         neigh->neighbour = neighbour;
 895         neigh->dev = dev;
 896         memset(&neigh->dgid.raw, 0, sizeof (union ib_gid));
 897         *to_ipoib_neigh(neighbour) = neigh;
 898         skb_queue_head_init(&neigh->queue);
 899         ipoib_cm_set(neigh, NULL);
 900
 901         return neigh;
 902 }
 903
 904 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 905 {
 906         struct sk_buff *skb;
 907         *to_ipoib_neigh(neigh->neighbour) = NULL;
 908         while ((skb = __skb_dequeue(&neigh->queue))) {
 909                 ++dev->stats.tx_dropped;
 910                 dev_kfree_skb_any(skb);
 911         }
 912         if (ipoib_cm_get(neigh))
 913                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 914         kfree(neigh);
 915 }
 916
 917 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 918 {
 919         parms->neigh_cleanup = ipoib_neigh_cleanup;
 920
 921         return 0;
 922 }
 923
 924 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 925 {
 926         struct ipoib_dev_priv *priv = netdev_priv(dev);
 927
 928         /* Allocate RX/TX "rings" to hold queued skbs */
 929         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 930                                 GFP_KERNEL);
 931         if (!priv->rx_ring) {
 932                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 933                        ca->name, ipoib_recvq_size);
 934                 goto out;
 935         }
 936
 937         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
 938         if (!priv->tx_ring) {
 939                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 940                        ca->name, ipoib_sendq_size);
 941                 goto out_rx_ring_cleanup;
 942         }
 943
 944         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 945
 946         if (ipoib_ib_dev_init(dev, ca, port))
 947                 goto out_tx_ring_cleanup;
 948
 949         return 0;
 950
 951 out_tx_ring_cleanup:
 952         vfree(priv->tx_ring);
 953
 954 out_rx_ring_cleanup:
 955         kfree(priv->rx_ring);
 956
 957 out:
 958         return -ENOMEM;
 959 }
 960
 961 void ipoib_dev_cleanup(struct net_device *dev)
 962 {
 963         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 964
 965         ipoib_delete_debug_files(dev);
 966
 967         /* Delete any child interfaces first */
 968         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 969                 unregister_netdev(cpriv->dev);
 970                 ipoib_dev_cleanup(cpriv->dev);
 971                 free_netdev(cpriv->dev);
 972         }
 973
 974         ipoib_ib_dev_cleanup(dev);
 975
 976         kfree(priv->rx_ring);
 977         vfree(priv->tx_ring);
 978
 979         priv->rx_ring = NULL;
 980         priv->tx_ring = NULL;
 981 }
 982
 983 static const struct header_ops ipoib_header_ops = {
 984         .create = ipoib_hard_header,
 985 };
 986
 987 static const struct net_device_ops ipoib_netdev_ops = {
 988         .ndo_open                = ipoib_open,
 989         .ndo_stop                = ipoib_stop,
 990         .ndo_change_mtu          = ipoib_change_mtu,
 991         .ndo_fix_features        = ipoib_fix_features,
 992         .ndo_start_xmit          = ipoib_start_xmit,
 993         .ndo_tx_timeout          = ipoib_timeout,
 994         .ndo_set_rx_mode         = ipoib_set_mcast_list,
 995         .ndo_neigh_setup         = ipoib_neigh_setup_dev,
 996 };
 997
 998 static void ipoib_setup(struct net_device *dev)
 999 {
1000         struct ipoib_dev_priv *priv = netdev_priv(dev);
1001
1002         dev->netdev_ops          = &ipoib_netdev_ops;
1003         dev->header_ops          = &ipoib_header_ops;
1004
1005         ipoib_set_ethtool_ops(dev);
1006
1007         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1008
1009         dev->watchdog_timeo      = HZ;
1010
1011         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1012
1013         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1014         dev->addr_len            = INFINIBAND_ALEN;
1015         dev->type                = ARPHRD_INFINIBAND;
1016         dev->tx_queue_len        = ipoib_sendq_size * 2;
1017         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1018                                     NETIF_F_HIGHDMA);
1019         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
1020
1021         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1022
1023         netif_carrier_off(dev);
1024
1025         priv->dev = dev;
1026
1027         spin_lock_init(&priv->lock);
1028
1029         mutex_init(&priv->vlan_mutex);
1030
1031         INIT_LIST_HEAD(&priv->path_list);
1032         INIT_LIST_HEAD(&priv->child_intfs);
1033         INIT_LIST_HEAD(&priv->dead_ahs);
1034         INIT_LIST_HEAD(&priv->multicast_list);
1035
1036         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1037         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1038         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1039         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1040         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1041         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1042         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1043         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1044 }
1045
1046 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1047 {
1048         struct net_device *dev;
1049
1050         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1051                            ipoib_setup);
1052         if (!dev)
1053                 return NULL;
1054
1055         return netdev_priv(dev);
1056 }
1057
1058 static ssize_t show_pkey(struct device *dev,
1059                          struct device_attribute *attr, char *buf)
1060 {
1061         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1062
1063         return sprintf(buf, "0x%04x\n", priv->pkey);
1064 }
1065 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1066
1067 static ssize_t show_umcast(struct device *dev,
1068                            struct device_attribute *attr, char *buf)
1069 {
1070         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1071
1072         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1073 }
1074
1075 static ssize_t set_umcast(struct device *dev,
1076                           struct device_attribute *attr,
1077                           const char *buf, size_t count)
1078 {
1079         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1080         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1081
1082         if (umcast_val > 0) {
1083                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1084                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1085                                 "by userspace\n");
1086         } else
1087                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1088
1089         return count;
1090 }
1091 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1092
1093 int ipoib_add_umcast_attr(struct net_device *dev)
1094 {
1095         return device_create_file(&dev->dev, &dev_attr_umcast);
1096 }
1097
1098 static ssize_t create_child(struct device *dev,
1099                             struct device_attribute *attr,
1100                             const char *buf, size_t count)
1101 {
1102         int pkey;
1103         int ret;
1104
1105         if (sscanf(buf, "%i", &pkey) != 1)
1106                 return -EINVAL;
1107
1108         if (pkey < 0 || pkey > 0xffff)
1109                 return -EINVAL;
1110
1111         /*
1112          * Set the full membership bit, so that we join the right
1113          * broadcast group, etc.
1114          */
1115         pkey |= 0x8000;
1116
1117         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1118
1119         return ret ? ret : count;
1120 }
1121 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1122
1123 static ssize_t delete_child(struct device *dev,
1124                             struct device_attribute *attr,
1125                             const char *buf, size_t count)
1126 {
1127         int pkey;
1128         int ret;
1129
1130         if (sscanf(buf, "%i", &pkey) != 1)
1131                 return -EINVAL;
1132
1133         if (pkey < 0 || pkey > 0xffff)
1134                 return -EINVAL;
1135
1136         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1137
1138         return ret ? ret : count;
1139
1140 }
1141 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1142
1143 int ipoib_add_pkey_attr(struct net_device *dev)
1144 {
1145         return device_create_file(&dev->dev, &dev_attr_pkey);
1146 }
1147
1148 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1149 {
1150         struct ib_device_attr *device_attr;
1151         int result = -ENOMEM;
1152
1153         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1154         if (!device_attr) {
1155                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1156                        hca->name, sizeof *device_attr);
1157                 return result;
1158         }
1159
1160         result = ib_query_device(hca, device_attr);
1161         if (result) {
1162                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1163                        hca->name, result);
1164                 kfree(device_attr);
1165                 return result;
1166         }
1167         priv->hca_caps = device_attr->device_cap_flags;
1168
1169         kfree(device_attr);
1170
1171         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1172                 priv->dev->hw_features = NETIF_F_SG |
1173                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1174
1175                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1176                         priv->dev->hw_features |= NETIF_F_TSO;
1177
1178                 priv->dev->features |= priv->dev->hw_features;
1179         }
1180
1181         return 0;
1182 }
1183
1184 static struct net_device *ipoib_add_port(const char *format,
1185                                          struct ib_device *hca, u8 port)
1186 {
1187         struct ipoib_dev_priv *priv;
1188         struct ib_port_attr attr;
1189         int result = -ENOMEM;
1190
1191         priv = ipoib_intf_alloc(format);
1192         if (!priv)
1193                 goto alloc_mem_failed;
1194
1195         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1196         priv->dev->dev_id = port - 1;
1197
1198         if (!ib_query_port(hca, port, &attr))
1199                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1200         else {
1201                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1202                        hca->name, port);
1203                 goto device_init_failed;
1204         }
1205
1206         /* MTU will be reset when mcast join happens */
1207         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1208         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1209
1210         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1211
1212         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1213         if (result) {
1214                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1215                        hca->name, port, result);
1216                 goto device_init_failed;
1217         }
1218
1219         if (ipoib_set_dev_features(priv, hca))
1220                 goto device_init_failed;
1221
1222         /*
1223          * Set the full membership bit, so that we join the right
1224          * broadcast group, etc.
1225          */
1226         priv->pkey |= 0x8000;
1227
1228         priv->dev->broadcast[8] = priv->pkey >> 8;
1229         priv->dev->broadcast[9] = priv->pkey & 0xff;
1230
1231         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1232         if (result) {
1233                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1234                        hca->name, port, result);
1235                 goto device_init_failed;
1236         } else
1237                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1238
1239         result = ipoib_dev_init(priv->dev, hca, port);
1240         if (result < 0) {
1241                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1242                        hca->name, port, result);
1243                 goto device_init_failed;
1244         }
1245
1246         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1247                               priv->ca, ipoib_event);
1248         result = ib_register_event_handler(&priv->event_handler);
1249         if (result < 0) {
1250                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1251                        "port %d (ret = %d)\n",
1252                        hca->name, port, result);
1253                 goto event_failed;
1254         }
1255
1256         result = register_netdev(priv->dev);
1257         if (result) {
1258                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1259                        hca->name, port, result);
1260                 goto register_failed;
1261         }
1262
1263         ipoib_create_debug_files(priv->dev);
1264
1265         if (ipoib_cm_add_mode_attr(priv->dev))
1266                 goto sysfs_failed;
1267         if (ipoib_add_pkey_attr(priv->dev))
1268                 goto sysfs_failed;
1269         if (ipoib_add_umcast_attr(priv->dev))
1270                 goto sysfs_failed;
1271         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1272                 goto sysfs_failed;
1273         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1274                 goto sysfs_failed;
1275
1276         return priv->dev;
1277
1278 sysfs_failed:
1279         ipoib_delete_debug_files(priv->dev);
1280         unregister_netdev(priv->dev);
1281
1282 register_failed:
1283         ib_unregister_event_handler(&priv->event_handler);
1284         flush_workqueue(ipoib_workqueue);
1285
1286 event_failed:
1287         ipoib_dev_cleanup(priv->dev);
1288
1289 device_init_failed:
1290         free_netdev(priv->dev);
1291
1292 alloc_mem_failed:
1293         return ERR_PTR(result);
1294 }
1295
1296 static void ipoib_add_one(struct ib_device *device)
1297 {
1298         struct list_head *dev_list;
1299         struct net_device *dev;
1300         struct ipoib_dev_priv *priv;
1301         int s, e, p;
1302
1303         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1304                 return;
1305
1306         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1307         if (!dev_list)
1308                 return;
1309
1310         INIT_LIST_HEAD(dev_list);
1311
1312         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1313                 s = 0;
1314                 e = 0;
1315         } else {
1316                 s = 1;
1317                 e = device->phys_port_cnt;
1318         }
1319
1320         for (p = s; p <= e; ++p) {
1321                 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1322                         continue;
1323                 dev = ipoib_add_port("ib%d", device, p);
1324                 if (!IS_ERR(dev)) {
1325                         priv = netdev_priv(dev);
1326                         list_add_tail(&priv->list, dev_list);
1327                 }
1328         }
1329
1330         ib_set_client_data(device, &ipoib_client, dev_list);
1331 }
1332
1333 static void ipoib_remove_one(struct ib_device *device)
1334 {
1335         struct ipoib_dev_priv *priv, *tmp;
1336         struct list_head *dev_list;
1337
1338         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1339                 return;
1340
1341         dev_list = ib_get_client_data(device, &ipoib_client);
1342
1343         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1344                 ib_unregister_event_handler(&priv->event_handler);
1345
1346                 rtnl_lock();
1347                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1348                 rtnl_unlock();
1349
1350                 flush_workqueue(ipoib_workqueue);
1351
1352                 unregister_netdev(priv->dev);
1353                 ipoib_dev_cleanup(priv->dev);
1354                 free_netdev(priv->dev);
1355         }
1356
1357         kfree(dev_list);
1358 }
1359
1360 static int __init ipoib_init_module(void)
1361 {
1362         int ret;
1363
1364         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1365         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1366         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1367
1368         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1369         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1370         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1371 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1372         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1373 #endif
1374
1375         /*
1376          * When copying small received packets, we only copy from the
1377          * linear data part of the SKB, so we rely on this condition.
1378          */
1379         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1380
1381         ret = ipoib_register_debugfs();
1382         if (ret)
1383                 return ret;
1384
1385         /*
1386          * We create our own workqueue mainly because we want to be
1387          * able to flush it when devices are being removed.  We can't
1388          * use schedule_work()/flush_scheduled_work() because both
1389          * unregister_netdev() and linkwatch_event take the rtnl lock,
1390          * so flush_scheduled_work() can deadlock during device
1391          * removal.
1392          */
1393         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1394         if (!ipoib_workqueue) {
1395                 ret = -ENOMEM;
1396                 goto err_fs;
1397         }
1398
1399         ib_sa_register_client(&ipoib_sa_client);
1400
1401         ret = ib_register_client(&ipoib_client);
1402         if (ret)
1403                 goto err_sa;
1404
1405         return 0;
1406
1407 err_sa:
1408         ib_sa_unregister_client(&ipoib_sa_client);
1409         destroy_workqueue(ipoib_workqueue);
1410
1411 err_fs:
1412         ipoib_unregister_debugfs();
1413
1414         return ret;
1415 }
1416
1417 static void __exit ipoib_cleanup_module(void)
1418 {
1419         ib_unregister_client(&ipoib_client);
1420         ib_sa_unregister_client(&ipoib_sa_client);
1421         ipoib_unregister_debugfs();
1422         destroy_workqueue(ipoib_workqueue);
1423 }
1424
1425 module_init(ipoib_init_module);
1426 module_exit(ipoib_cleanup_module);