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   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 static int lro;
  64 module_param(lro, bool, 0444);
  65 MODULE_PARM_DESC(lro,  "Enable LRO (Large Receive Offload)");
  66
  67 static int lro_max_aggr = IPOIB_LRO_MAX_AGGR;
  68 module_param(lro_max_aggr, int, 0644);
  69 MODULE_PARM_DESC(lro_max_aggr, "LRO: Max packets to be aggregated "
  70                 "(default = 64)");
  71
  72 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  73 int ipoib_debug_level;
  74
  75 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  76 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  77 #endif
  78
  79 struct ipoib_path_iter {
  80         struct net_device *dev;
  81         struct ipoib_path  path;
  82 };
  83
  84 static const u8 ipv4_bcast_addr[] = {
  85         0x00, 0xff, 0xff, 0xff,
  86         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  87         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  88 };
  89
  90 struct workqueue_struct *ipoib_workqueue;
  91
  92 struct ib_sa_client ipoib_sa_client;
  93
  94 static void ipoib_add_one(struct ib_device *device);
  95 static void ipoib_remove_one(struct ib_device *device);
  96
  97 static struct ib_client ipoib_client = {
  98         .name   = "ipoib",
  99         .add    = ipoib_add_one,
 100         .remove = ipoib_remove_one
 101 };
 102
 103 int ipoib_open(struct net_device *dev)
 104 {
 105         struct ipoib_dev_priv *priv = netdev_priv(dev);
 106
 107         ipoib_dbg(priv, "bringing up interface\n");
 108
 109         napi_enable(&priv->napi);
 110         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 111
 112         if (ipoib_pkey_dev_delay_open(dev))
 113                 return 0;
 114
 115         if (ipoib_ib_dev_open(dev)) {
 116                 napi_disable(&priv->napi);
 117                 return -EINVAL;
 118         }
 119
 120         if (ipoib_ib_dev_up(dev)) {
 121                 ipoib_ib_dev_stop(dev, 1);
 122                 napi_disable(&priv->napi);
 123                 return -EINVAL;
 124         }
 125
 126         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 127                 struct ipoib_dev_priv *cpriv;
 128
 129                 /* Bring up any child interfaces too */
 130                 mutex_lock(&priv->vlan_mutex);
 131                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 132                         int flags;
 133
 134                         flags = cpriv->dev->flags;
 135                         if (flags & IFF_UP)
 136                                 continue;
 137
 138                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 139                 }
 140                 mutex_unlock(&priv->vlan_mutex);
 141         }
 142
 143         netif_start_queue(dev);
 144
 145         return 0;
 146 }
 147
 148 static int ipoib_stop(struct net_device *dev)
 149 {
 150         struct ipoib_dev_priv *priv = netdev_priv(dev);
 151
 152         ipoib_dbg(priv, "stopping interface\n");
 153
 154         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 155         napi_disable(&priv->napi);
 156
 157         netif_stop_queue(dev);
 158
 159         /*
 160          * Now flush workqueue to make sure a scheduled task doesn't
 161          * bring our internal state back up.
 162          */
 163         flush_workqueue(ipoib_workqueue);
 164
 165         ipoib_ib_dev_down(dev, 1);
 166         ipoib_ib_dev_stop(dev, 1);
 167
 168         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 169                 struct ipoib_dev_priv *cpriv;
 170
 171                 /* Bring down any child interfaces too */
 172                 mutex_lock(&priv->vlan_mutex);
 173                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 174                         int flags;
 175
 176                         flags = cpriv->dev->flags;
 177                         if (!(flags & IFF_UP))
 178                                 continue;
 179
 180                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 181                 }
 182                 mutex_unlock(&priv->vlan_mutex);
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 189 {
 190         struct ipoib_dev_priv *priv = netdev_priv(dev);
 191
 192         /* dev->mtu > 2K ==> connected mode */
 193         if (ipoib_cm_admin_enabled(dev)) {
 194                 if (new_mtu > ipoib_cm_max_mtu(dev))
 195                         return -EINVAL;
 196
 197                 if (new_mtu > priv->mcast_mtu)
 198                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 199                                    priv->mcast_mtu);
 200
 201                 dev->mtu = new_mtu;
 202                 return 0;
 203         }
 204
 205         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 206                 return -EINVAL;
 207
 208         priv->admin_mtu = new_mtu;
 209
 210         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 211
 212         return 0;
 213 }
 214
 215 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 216 {
 217         struct ipoib_dev_priv *priv = netdev_priv(dev);
 218         struct rb_node *n = priv->path_tree.rb_node;
 219         struct ipoib_path *path;
 220         int ret;
 221
 222         while (n) {
 223                 path = rb_entry(n, struct ipoib_path, rb_node);
 224
 225                 ret = memcmp(gid, path->pathrec.dgid.raw,
 226                              sizeof (union ib_gid));
 227
 228                 if (ret < 0)
 229                         n = n->rb_left;
 230                 else if (ret > 0)
 231                         n = n->rb_right;
 232                 else
 233                         return path;
 234         }
 235
 236         return NULL;
 237 }
 238
 239 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 240 {
 241         struct ipoib_dev_priv *priv = netdev_priv(dev);
 242         struct rb_node **n = &priv->path_tree.rb_node;
 243         struct rb_node *pn = NULL;
 244         struct ipoib_path *tpath;
 245         int ret;
 246
 247         while (*n) {
 248                 pn = *n;
 249                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 250
 251                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 252                              sizeof (union ib_gid));
 253                 if (ret < 0)
 254                         n = &pn->rb_left;
 255                 else if (ret > 0)
 256                         n = &pn->rb_right;
 257                 else
 258                         return -EEXIST;
 259         }
 260
 261         rb_link_node(&path->rb_node, pn, n);
 262         rb_insert_color(&path->rb_node, &priv->path_tree);
 263
 264         list_add_tail(&path->list, &priv->path_list);
 265
 266         return 0;
 267 }
 268
 269 static void path_free(struct net_device *dev, struct ipoib_path *path)
 270 {
 271         struct ipoib_dev_priv *priv = netdev_priv(dev);
 272         struct ipoib_neigh *neigh, *tn;
 273         struct sk_buff *skb;
 274         unsigned long flags;
 275
 276         while ((skb = __skb_dequeue(&path->queue)))
 277                 dev_kfree_skb_irq(skb);
 278
 279         spin_lock_irqsave(&priv->lock, flags);
 280
 281         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 282                 /*
 283                  * It's safe to call ipoib_put_ah() inside priv->lock
 284                  * here, because we know that path->ah will always
 285                  * hold one more reference, so ipoib_put_ah() will
 286                  * never do more than decrement the ref count.
 287                  */
 288                 if (neigh->ah)
 289                         ipoib_put_ah(neigh->ah);
 290
 291                 ipoib_neigh_free(dev, neigh);
 292         }
 293
 294         spin_unlock_irqrestore(&priv->lock, flags);
 295
 296         if (path->ah)
 297                 ipoib_put_ah(path->ah);
 298
 299         kfree(path);
 300 }
 301
 302 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 303
 304 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 305 {
 306         struct ipoib_path_iter *iter;
 307
 308         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 309         if (!iter)
 310                 return NULL;
 311
 312         iter->dev = dev;
 313         memset(iter->path.pathrec.dgid.raw, 0, 16);
 314
 315         if (ipoib_path_iter_next(iter)) {
 316                 kfree(iter);
 317                 return NULL;
 318         }
 319
 320         return iter;
 321 }
 322
 323 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 324 {
 325         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 326         struct rb_node *n;
 327         struct ipoib_path *path;
 328         int ret = 1;
 329
 330         spin_lock_irq(&priv->lock);
 331
 332         n = rb_first(&priv->path_tree);
 333
 334         while (n) {
 335                 path = rb_entry(n, struct ipoib_path, rb_node);
 336
 337                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 338                            sizeof (union ib_gid)) < 0) {
 339                         iter->path = *path;
 340                         ret = 0;
 341                         break;
 342                 }
 343
 344                 n = rb_next(n);
 345         }
 346
 347         spin_unlock_irq(&priv->lock);
 348
 349         return ret;
 350 }
 351
 352 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 353                           struct ipoib_path *path)
 354 {
 355         *path = iter->path;
 356 }
 357
 358 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 359
 360 void ipoib_flush_paths(struct net_device *dev)
 361 {
 362         struct ipoib_dev_priv *priv = netdev_priv(dev);
 363         struct ipoib_path *path, *tp;
 364         LIST_HEAD(remove_list);
 365
 366         spin_lock_irq(&priv->tx_lock);
 367         spin_lock(&priv->lock);
 368
 369         list_splice_init(&priv->path_list, &remove_list);
 370
 371         list_for_each_entry(path, &remove_list, list)
 372                 rb_erase(&path->rb_node, &priv->path_tree);
 373
 374         list_for_each_entry_safe(path, tp, &remove_list, list) {
 375                 if (path->query)
 376                         ib_sa_cancel_query(path->query_id, path->query);
 377                 spin_unlock(&priv->lock);
 378                 spin_unlock_irq(&priv->tx_lock);
 379                 wait_for_completion(&path->done);
 380                 path_free(dev, path);
 381                 spin_lock_irq(&priv->tx_lock);
 382                 spin_lock(&priv->lock);
 383         }
 384         spin_unlock(&priv->lock);
 385         spin_unlock_irq(&priv->tx_lock);
 386 }
 387
 388 static void path_rec_completion(int status,
 389                                 struct ib_sa_path_rec *pathrec,
 390                                 void *path_ptr)
 391 {
 392         struct ipoib_path *path = path_ptr;
 393         struct net_device *dev = path->dev;
 394         struct ipoib_dev_priv *priv = netdev_priv(dev);
 395         struct ipoib_ah *ah = NULL;
 396         struct ipoib_neigh *neigh, *tn;
 397         struct sk_buff_head skqueue;
 398         struct sk_buff *skb;
 399         unsigned long flags;
 400
 401         if (!status)
 402                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 403                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 404         else
 405                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 406                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 407
 408         skb_queue_head_init(&skqueue);
 409
 410         if (!status) {
 411                 struct ib_ah_attr av;
 412
 413                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 414                         ah = ipoib_create_ah(dev, priv->pd, &av);
 415         }
 416
 417         spin_lock_irqsave(&priv->lock, flags);
 418
 419         path->ah = ah;
 420
 421         if (ah) {
 422                 path->pathrec = *pathrec;
 423
 424                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 425                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 426
 427                 while ((skb = __skb_dequeue(&path->queue)))
 428                         __skb_queue_tail(&skqueue, skb);
 429
 430                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 431                         kref_get(&path->ah->ref);
 432                         neigh->ah = path->ah;
 433                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 434                                sizeof(union ib_gid));
 435
 436                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 437                                 if (!ipoib_cm_get(neigh))
 438                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 439                                                                                path,
 440                                                                                neigh));
 441                                 if (!ipoib_cm_get(neigh)) {
 442                                         list_del(&neigh->list);
 443                                         if (neigh->ah)
 444                                                 ipoib_put_ah(neigh->ah);
 445                                         ipoib_neigh_free(dev, neigh);
 446                                         continue;
 447                                 }
 448                         }
 449
 450                         while ((skb = __skb_dequeue(&neigh->queue)))
 451                                 __skb_queue_tail(&skqueue, skb);
 452                 }
 453         }
 454
 455         path->query = NULL;
 456         complete(&path->done);
 457
 458         spin_unlock_irqrestore(&priv->lock, flags);
 459
 460         while ((skb = __skb_dequeue(&skqueue))) {
 461                 skb->dev = dev;
 462                 if (dev_queue_xmit(skb))
 463                         ipoib_warn(priv, "dev_queue_xmit failed "
 464                                    "to requeue packet\n");
 465         }
 466 }
 467
 468 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 469 {
 470         struct ipoib_dev_priv *priv = netdev_priv(dev);
 471         struct ipoib_path *path;
 472
 473         if (!priv->broadcast)
 474                 return NULL;
 475
 476         path = kzalloc(sizeof *path, GFP_ATOMIC);
 477         if (!path)
 478                 return NULL;
 479
 480         path->dev = dev;
 481
 482         skb_queue_head_init(&path->queue);
 483
 484         INIT_LIST_HEAD(&path->neigh_list);
 485
 486         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 487         path->pathrec.sgid          = priv->local_gid;
 488         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 489         path->pathrec.numb_path     = 1;
 490         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 491
 492         return path;
 493 }
 494
 495 static int path_rec_start(struct net_device *dev,
 496                           struct ipoib_path *path)
 497 {
 498         struct ipoib_dev_priv *priv = netdev_priv(dev);
 499
 500         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 501                   IPOIB_GID_ARG(path->pathrec.dgid));
 502
 503         init_completion(&path->done);
 504
 505         path->query_id =
 506                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 507                                    &path->pathrec,
 508                                    IB_SA_PATH_REC_DGID          |
 509                                    IB_SA_PATH_REC_SGID          |
 510                                    IB_SA_PATH_REC_NUMB_PATH     |
 511                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 512                                    IB_SA_PATH_REC_PKEY,
 513                                    1000, GFP_ATOMIC,
 514                                    path_rec_completion,
 515                                    path, &path->query);
 516         if (path->query_id < 0) {
 517                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 518                 path->query = NULL;
 519                 return path->query_id;
 520         }
 521
 522         return 0;
 523 }
 524
 525 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 526 {
 527         struct ipoib_dev_priv *priv = netdev_priv(dev);
 528         struct ipoib_path *path;
 529         struct ipoib_neigh *neigh;
 530
 531         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 532         if (!neigh) {
 533                 ++dev->stats.tx_dropped;
 534                 dev_kfree_skb_any(skb);
 535                 return;
 536         }
 537
 538         /*
 539          * We can only be called from ipoib_start_xmit, so we're
 540          * inside tx_lock -- no need to save/restore flags.
 541          */
 542         spin_lock(&priv->lock);
 543
 544         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 545         if (!path) {
 546                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 547                 if (!path)
 548                         goto err_path;
 549
 550                 __path_add(dev, path);
 551         }
 552
 553         list_add_tail(&neigh->list, &path->neigh_list);
 554
 555         if (path->ah) {
 556                 kref_get(&path->ah->ref);
 557                 neigh->ah = path->ah;
 558                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 559                        sizeof(union ib_gid));
 560
 561                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 562                         if (!ipoib_cm_get(neigh))
 563                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 564                         if (!ipoib_cm_get(neigh)) {
 565                                 list_del(&neigh->list);
 566                                 if (neigh->ah)
 567                                         ipoib_put_ah(neigh->ah);
 568                                 ipoib_neigh_free(dev, neigh);
 569                                 goto err_drop;
 570                         }
 571                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 572                                 __skb_queue_tail(&neigh->queue, skb);
 573                         else {
 574                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 575                                            skb_queue_len(&neigh->queue));
 576                                 goto err_drop;
 577                         }
 578                 } else
 579                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 580         } else {
 581                 neigh->ah  = NULL;
 582
 583                 if (!path->query && path_rec_start(dev, path))
 584                         goto err_list;
 585
 586                 __skb_queue_tail(&neigh->queue, skb);
 587         }
 588
 589         spin_unlock(&priv->lock);
 590         return;
 591
 592 err_list:
 593         list_del(&neigh->list);
 594
 595 err_path:
 596         ipoib_neigh_free(dev, neigh);
 597 err_drop:
 598         ++dev->stats.tx_dropped;
 599         dev_kfree_skb_any(skb);
 600
 601         spin_unlock(&priv->lock);
 602 }
 603
 604 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 605 {
 606         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 607
 608         /* Look up path record for unicasts */
 609         if (skb->dst->neighbour->ha[4] != 0xff) {
 610                 neigh_add_path(skb, dev);
 611                 return;
 612         }
 613
 614         /* Add in the P_Key for multicasts */
 615         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 616         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 617         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 618 }
 619
 620 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 621                              struct ipoib_pseudoheader *phdr)
 622 {
 623         struct ipoib_dev_priv *priv = netdev_priv(dev);
 624         struct ipoib_path *path;
 625
 626         /*
 627          * We can only be called from ipoib_start_xmit, so we're
 628          * inside tx_lock -- no need to save/restore flags.
 629          */
 630         spin_lock(&priv->lock);
 631
 632         path = __path_find(dev, phdr->hwaddr + 4);
 633         if (!path) {
 634                 path = path_rec_create(dev, phdr->hwaddr + 4);
 635                 if (path) {
 636                         /* put pseudoheader back on for next time */
 637                         skb_push(skb, sizeof *phdr);
 638                         __skb_queue_tail(&path->queue, skb);
 639
 640                         if (path_rec_start(dev, path)) {
 641                                 spin_unlock(&priv->lock);
 642                                 path_free(dev, path);
 643                                 return;
 644                         } else
 645                                 __path_add(dev, path);
 646                 } else {
 647                         ++dev->stats.tx_dropped;
 648                         dev_kfree_skb_any(skb);
 649                 }
 650
 651                 spin_unlock(&priv->lock);
 652                 return;
 653         }
 654
 655         if (path->ah) {
 656                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 657                           be16_to_cpu(path->pathrec.dlid));
 658
 659                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 660         } else if ((path->query || !path_rec_start(dev, path)) &&
 661                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 662                 /* put pseudoheader back on for next time */
 663                 skb_push(skb, sizeof *phdr);
 664                 __skb_queue_tail(&path->queue, skb);
 665         } else {
 666                 ++dev->stats.tx_dropped;
 667                 dev_kfree_skb_any(skb);
 668         }
 669
 670         spin_unlock(&priv->lock);
 671 }
 672
 673 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 674 {
 675         struct ipoib_dev_priv *priv = netdev_priv(dev);
 676         struct ipoib_neigh *neigh;
 677         unsigned long flags;
 678
 679         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 680                 return NETDEV_TX_LOCKED;
 681
 682         if (likely(skb->dst && skb->dst->neighbour)) {
 683                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 684                         ipoib_path_lookup(skb, dev);
 685                         goto out;
 686                 }
 687
 688                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 689
 690                 if (neigh->ah)
 691                         if (unlikely((memcmp(&neigh->dgid.raw,
 692                                             skb->dst->neighbour->ha + 4,
 693                                             sizeof(union ib_gid))) ||
 694                                          (neigh->dev != dev))) {
 695                                 spin_lock(&priv->lock);
 696                                 /*
 697                                  * It's safe to call ipoib_put_ah() inside
 698                                  * priv->lock here, because we know that
 699                                  * path->ah will always hold one more reference,
 700                                  * so ipoib_put_ah() will never do more than
 701                                  * decrement the ref count.
 702                                  */
 703                                 ipoib_put_ah(neigh->ah);
 704                                 list_del(&neigh->list);
 705                                 ipoib_neigh_free(dev, neigh);
 706                                 spin_unlock(&priv->lock);
 707                                 ipoib_path_lookup(skb, dev);
 708                                 goto out;
 709                         }
 710
 711                 if (ipoib_cm_get(neigh)) {
 712                         if (ipoib_cm_up(neigh)) {
 713                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 714                                 goto out;
 715                         }
 716                 } else if (neigh->ah) {
 717                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 718                         goto out;
 719                 }
 720
 721                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 722                         spin_lock(&priv->lock);
 723                         __skb_queue_tail(&neigh->queue, skb);
 724                         spin_unlock(&priv->lock);
 725                 } else {
 726                         ++dev->stats.tx_dropped;
 727                         dev_kfree_skb_any(skb);
 728                 }
 729         } else {
 730                 struct ipoib_pseudoheader *phdr =
 731                         (struct ipoib_pseudoheader *) skb->data;
 732                 skb_pull(skb, sizeof *phdr);
 733
 734                 if (phdr->hwaddr[4] == 0xff) {
 735                         /* Add in the P_Key for multicast*/
 736                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 737                         phdr->hwaddr[9] = priv->pkey & 0xff;
 738
 739                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 740                 } else {
 741                         /* unicast GID -- should be ARP or RARP reply */
 742
 743                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 744                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 745                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 746                                            IPOIB_GID_FMT "\n",
 747                                            skb->dst ? "neigh" : "dst",
 748                                            be16_to_cpup((__be16 *) skb->data),
 749                                            IPOIB_QPN(phdr->hwaddr),
 750                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 751                                 dev_kfree_skb_any(skb);
 752                                 ++dev->stats.tx_dropped;
 753                                 goto out;
 754                         }
 755
 756                         unicast_arp_send(skb, dev, phdr);
 757                 }
 758         }
 759
 760 out:
 761         spin_unlock_irqrestore(&priv->tx_lock, flags);
 762
 763         return NETDEV_TX_OK;
 764 }
 765
 766 static void ipoib_timeout(struct net_device *dev)
 767 {
 768         struct ipoib_dev_priv *priv = netdev_priv(dev);
 769
 770         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 771                    jiffies_to_msecs(jiffies - dev->trans_start));
 772         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 773                    netif_queue_stopped(dev),
 774                    priv->tx_head, priv->tx_tail);
 775         /* XXX reset QP, etc. */
 776 }
 777
 778 static int ipoib_hard_header(struct sk_buff *skb,
 779                              struct net_device *dev,
 780                              unsigned short type,
 781                              const void *daddr, const void *saddr, unsigned len)
 782 {
 783         struct ipoib_header *header;
 784
 785         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 786
 787         header->proto = htons(type);
 788         header->reserved = 0;
 789
 790         /*
 791          * If we don't have a neighbour structure, stuff the
 792          * destination address onto the front of the skb so we can
 793          * figure out where to send the packet later.
 794          */
 795         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 796                 struct ipoib_pseudoheader *phdr =
 797                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 798                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 799         }
 800
 801         return 0;
 802 }
 803
 804 static void ipoib_set_mcast_list(struct net_device *dev)
 805 {
 806         struct ipoib_dev_priv *priv = netdev_priv(dev);
 807
 808         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 809                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 810                 return;
 811         }
 812
 813         queue_work(ipoib_workqueue, &priv->restart_task);
 814 }
 815
 816 static void ipoib_neigh_cleanup(struct neighbour *n)
 817 {
 818         struct ipoib_neigh *neigh;
 819         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 820         unsigned long flags;
 821         struct ipoib_ah *ah = NULL;
 822
 823         neigh = *to_ipoib_neigh(n);
 824         if (neigh)
 825                 priv = netdev_priv(neigh->dev);
 826         else
 827                 return;
 828         ipoib_dbg(priv,
 829                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 830                   IPOIB_QPN(n->ha),
 831                   IPOIB_GID_RAW_ARG(n->ha + 4));
 832
 833         spin_lock_irqsave(&priv->lock, flags);
 834
 835         if (neigh->ah)
 836                 ah = neigh->ah;
 837         list_del(&neigh->list);
 838         ipoib_neigh_free(n->dev, neigh);
 839
 840         spin_unlock_irqrestore(&priv->lock, flags);
 841
 842         if (ah)
 843                 ipoib_put_ah(ah);
 844 }
 845
 846 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 847                                       struct net_device *dev)
 848 {
 849         struct ipoib_neigh *neigh;
 850
 851         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 852         if (!neigh)
 853                 return NULL;
 854
 855         neigh->neighbour = neighbour;
 856         neigh->dev = dev;
 857         *to_ipoib_neigh(neighbour) = neigh;
 858         skb_queue_head_init(&neigh->queue);
 859         ipoib_cm_set(neigh, NULL);
 860
 861         return neigh;
 862 }
 863
 864 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 865 {
 866         struct sk_buff *skb;
 867         *to_ipoib_neigh(neigh->neighbour) = NULL;
 868         while ((skb = __skb_dequeue(&neigh->queue))) {
 869                 ++dev->stats.tx_dropped;
 870                 dev_kfree_skb_any(skb);
 871         }
 872         if (ipoib_cm_get(neigh))
 873                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 874         kfree(neigh);
 875 }
 876
 877 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 878 {
 879         parms->neigh_cleanup = ipoib_neigh_cleanup;
 880
 881         return 0;
 882 }
 883
 884 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 885 {
 886         struct ipoib_dev_priv *priv = netdev_priv(dev);
 887
 888         /* Allocate RX/TX "rings" to hold queued skbs */
 889         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 890                                 GFP_KERNEL);
 891         if (!priv->rx_ring) {
 892                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 893                        ca->name, ipoib_recvq_size);
 894                 goto out;
 895         }
 896
 897         priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
 898         if (!priv->tx_ring) {
 899                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 900                        ca->name, ipoib_sendq_size);
 901                 goto out_rx_ring_cleanup;
 902         }
 903         memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
 904
 905         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 906
 907         if (ipoib_ib_dev_init(dev, ca, port))
 908                 goto out_tx_ring_cleanup;
 909
 910         return 0;
 911
 912 out_tx_ring_cleanup:
 913         vfree(priv->tx_ring);
 914
 915 out_rx_ring_cleanup:
 916         kfree(priv->rx_ring);
 917
 918 out:
 919         return -ENOMEM;
 920 }
 921
 922 void ipoib_dev_cleanup(struct net_device *dev)
 923 {
 924         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 925
 926         ipoib_delete_debug_files(dev);
 927
 928         /* Delete any child interfaces first */
 929         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 930                 unregister_netdev(cpriv->dev);
 931                 ipoib_dev_cleanup(cpriv->dev);
 932                 free_netdev(cpriv->dev);
 933         }
 934
 935         ipoib_ib_dev_cleanup(dev);
 936
 937         kfree(priv->rx_ring);
 938         vfree(priv->tx_ring);
 939
 940         priv->rx_ring = NULL;
 941         priv->tx_ring = NULL;
 942 }
 943
 944 static const struct header_ops ipoib_header_ops = {
 945         .create = ipoib_hard_header,
 946 };
 947
 948 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
 949                        void **tcph, u64 *hdr_flags, void *priv)
 950 {
 951         unsigned int ip_len;
 952         struct iphdr *iph;
 953
 954         if (unlikely(skb->protocol != htons(ETH_P_IP)))
 955                 return -1;
 956
 957         /*
 958          * In the future we may add an else clause that verifies the
 959          * checksum and allows devices which do not calculate checksum
 960          * to use LRO.
 961          */
 962         if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY))
 963                 return -1;
 964
 965         /* Check for non-TCP packet */
 966         skb_reset_network_header(skb);
 967         iph = ip_hdr(skb);
 968         if (iph->protocol != IPPROTO_TCP)
 969                 return -1;
 970
 971         ip_len = ip_hdrlen(skb);
 972         skb_set_transport_header(skb, ip_len);
 973         *tcph = tcp_hdr(skb);
 974
 975         /* check if IP header and TCP header are complete */
 976         if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
 977                 return -1;
 978
 979         *hdr_flags = LRO_IPV4 | LRO_TCP;
 980         *iphdr = iph;
 981
 982         return 0;
 983 }
 984
 985 static void ipoib_lro_setup(struct ipoib_dev_priv *priv)
 986 {
 987         priv->lro.lro_mgr.max_aggr       = lro_max_aggr;
 988         priv->lro.lro_mgr.max_desc       = IPOIB_MAX_LRO_DESCRIPTORS;
 989         priv->lro.lro_mgr.lro_arr        = priv->lro.lro_desc;
 990         priv->lro.lro_mgr.get_skb_header = get_skb_hdr;
 991         priv->lro.lro_mgr.features       = LRO_F_NAPI;
 992         priv->lro.lro_mgr.dev            = priv->dev;
 993         priv->lro.lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
 994 }
 995
 996 static void ipoib_setup(struct net_device *dev)
 997 {
 998         struct ipoib_dev_priv *priv = netdev_priv(dev);
 999
1000         dev->open                = ipoib_open;
1001         dev->stop                = ipoib_stop;
1002         dev->change_mtu          = ipoib_change_mtu;
1003         dev->hard_start_xmit     = ipoib_start_xmit;
1004         dev->tx_timeout          = ipoib_timeout;
1005         dev->header_ops          = &ipoib_header_ops;
1006         dev->set_multicast_list  = ipoib_set_mcast_list;
1007         dev->neigh_setup         = ipoib_neigh_setup_dev;
1008
1009         ipoib_set_ethtool_ops(dev);
1010
1011         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1012
1013         dev->watchdog_timeo      = HZ;
1014
1015         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1016
1017         /*
1018          * We add in INFINIBAND_ALEN to allow for the destination
1019          * address "pseudoheader" for skbs without neighbour struct.
1020          */
1021         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1022         dev->addr_len            = INFINIBAND_ALEN;
1023         dev->type                = ARPHRD_INFINIBAND;
1024         dev->tx_queue_len        = ipoib_sendq_size * 2;
1025         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1026                                     NETIF_F_LLTX                |
1027                                     NETIF_F_HIGHDMA);
1028
1029         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1030
1031         netif_carrier_off(dev);
1032
1033         priv->dev = dev;
1034
1035         ipoib_lro_setup(priv);
1036
1037         spin_lock_init(&priv->lock);
1038         spin_lock_init(&priv->tx_lock);
1039
1040         mutex_init(&priv->mcast_mutex);
1041         mutex_init(&priv->vlan_mutex);
1042
1043         INIT_LIST_HEAD(&priv->path_list);
1044         INIT_LIST_HEAD(&priv->child_intfs);
1045         INIT_LIST_HEAD(&priv->dead_ahs);
1046         INIT_LIST_HEAD(&priv->multicast_list);
1047
1048         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1049         INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
1050         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1051         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
1052         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1053         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1054 }
1055
1056 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1057 {
1058         struct net_device *dev;
1059
1060         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1061                            ipoib_setup);
1062         if (!dev)
1063                 return NULL;
1064
1065         return netdev_priv(dev);
1066 }
1067
1068 static ssize_t show_pkey(struct device *dev,
1069                          struct device_attribute *attr, char *buf)
1070 {
1071         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1072
1073         return sprintf(buf, "0x%04x\n", priv->pkey);
1074 }
1075 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1076
1077 static ssize_t show_umcast(struct device *dev,
1078                            struct device_attribute *attr, char *buf)
1079 {
1080         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1081
1082         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1083 }
1084
1085 static ssize_t set_umcast(struct device *dev,
1086                           struct device_attribute *attr,
1087                           const char *buf, size_t count)
1088 {
1089         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1090         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1091
1092         if (umcast_val > 0) {
1093                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1094                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1095                                 "by userspace\n");
1096         } else
1097                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1098
1099         return count;
1100 }
1101 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1102
1103 int ipoib_add_umcast_attr(struct net_device *dev)
1104 {
1105         return device_create_file(&dev->dev, &dev_attr_umcast);
1106 }
1107
1108 static ssize_t create_child(struct device *dev,
1109                             struct device_attribute *attr,
1110                             const char *buf, size_t count)
1111 {
1112         int pkey;
1113         int ret;
1114
1115         if (sscanf(buf, "%i", &pkey) != 1)
1116                 return -EINVAL;
1117
1118         if (pkey < 0 || pkey > 0xffff)
1119                 return -EINVAL;
1120
1121         /*
1122          * Set the full membership bit, so that we join the right
1123          * broadcast group, etc.
1124          */
1125         pkey |= 0x8000;
1126
1127         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1128
1129         return ret ? ret : count;
1130 }
1131 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1132
1133 static ssize_t delete_child(struct device *dev,
1134                             struct device_attribute *attr,
1135                             const char *buf, size_t count)
1136 {
1137         int pkey;
1138         int ret;
1139
1140         if (sscanf(buf, "%i", &pkey) != 1)
1141                 return -EINVAL;
1142
1143         if (pkey < 0 || pkey > 0xffff)
1144                 return -EINVAL;
1145
1146         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1147
1148         return ret ? ret : count;
1149
1150 }
1151 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1152
1153 int ipoib_add_pkey_attr(struct net_device *dev)
1154 {
1155         return device_create_file(&dev->dev, &dev_attr_pkey);
1156 }
1157
1158 static struct net_device *ipoib_add_port(const char *format,
1159                                          struct ib_device *hca, u8 port)
1160 {
1161         struct ipoib_dev_priv *priv;
1162         struct ib_device_attr *device_attr;
1163         struct ib_port_attr attr;
1164         int result = -ENOMEM;
1165
1166         priv = ipoib_intf_alloc(format);
1167         if (!priv)
1168                 goto alloc_mem_failed;
1169
1170         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1171
1172         if (!ib_query_port(hca, port, &attr))
1173                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1174         else {
1175                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1176                        hca->name, port);
1177                 goto device_init_failed;
1178         }
1179
1180         /* MTU will be reset when mcast join happens */
1181         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1182         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1183
1184         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1185         if (result) {
1186                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1187                        hca->name, port, result);
1188                 goto device_init_failed;
1189         }
1190
1191         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1192         if (!device_attr) {
1193                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1194                        hca->name, sizeof *device_attr);
1195                 goto device_init_failed;
1196         }
1197
1198         result = ib_query_device(hca, device_attr);
1199         if (result) {
1200                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1201                        hca->name, result);
1202                 kfree(device_attr);
1203                 goto device_init_failed;
1204         }
1205         priv->hca_caps = device_attr->device_cap_flags;
1206
1207         kfree(device_attr);
1208
1209         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1210                 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1211                 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1212         }
1213
1214         if (lro)
1215                 priv->dev->features |= NETIF_F_LRO;
1216
1217         /*
1218          * Set the full membership bit, so that we join the right
1219          * broadcast group, etc.
1220          */
1221         priv->pkey |= 0x8000;
1222
1223         priv->dev->broadcast[8] = priv->pkey >> 8;
1224         priv->dev->broadcast[9] = priv->pkey & 0xff;
1225
1226         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1227         if (result) {
1228                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1229                        hca->name, port, result);
1230                 goto device_init_failed;
1231         } else
1232                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1233
1234         result = ipoib_dev_init(priv->dev, hca, port);
1235         if (result < 0) {
1236                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1237                        hca->name, port, result);
1238                 goto device_init_failed;
1239         }
1240
1241         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1242                               priv->ca, ipoib_event);
1243         result = ib_register_event_handler(&priv->event_handler);
1244         if (result < 0) {
1245                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1246                        "port %d (ret = %d)\n",
1247                        hca->name, port, result);
1248                 goto event_failed;
1249         }
1250
1251         if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1252                 priv->dev->features |= NETIF_F_TSO;
1253
1254         result = register_netdev(priv->dev);
1255         if (result) {
1256                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1257                        hca->name, port, result);
1258                 goto register_failed;
1259         }
1260
1261         ipoib_create_debug_files(priv->dev);
1262
1263         if (ipoib_cm_add_mode_attr(priv->dev))
1264                 goto sysfs_failed;
1265         if (ipoib_add_pkey_attr(priv->dev))
1266                 goto sysfs_failed;
1267         if (ipoib_add_umcast_attr(priv->dev))
1268                 goto sysfs_failed;
1269         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1270                 goto sysfs_failed;
1271         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1272                 goto sysfs_failed;
1273
1274         return priv->dev;
1275
1276 sysfs_failed:
1277         ipoib_delete_debug_files(priv->dev);
1278         unregister_netdev(priv->dev);
1279
1280 register_failed:
1281         ib_unregister_event_handler(&priv->event_handler);
1282         flush_scheduled_work();
1283
1284 event_failed:
1285         ipoib_dev_cleanup(priv->dev);
1286
1287 device_init_failed:
1288         free_netdev(priv->dev);
1289
1290 alloc_mem_failed:
1291         return ERR_PTR(result);
1292 }
1293
1294 static void ipoib_add_one(struct ib_device *device)
1295 {
1296         struct list_head *dev_list;
1297         struct net_device *dev;
1298         struct ipoib_dev_priv *priv;
1299         int s, e, p;
1300
1301         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1302                 return;
1303
1304         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1305         if (!dev_list)
1306                 return;
1307
1308         INIT_LIST_HEAD(dev_list);
1309
1310         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1311                 s = 0;
1312                 e = 0;
1313         } else {
1314                 s = 1;
1315                 e = device->phys_port_cnt;
1316         }
1317
1318         for (p = s; p <= e; ++p) {
1319                 dev = ipoib_add_port("ib%d", device, p);
1320                 if (!IS_ERR(dev)) {
1321                         priv = netdev_priv(dev);
1322                         list_add_tail(&priv->list, dev_list);
1323                 }
1324         }
1325
1326         ib_set_client_data(device, &ipoib_client, dev_list);
1327 }
1328
1329 static void ipoib_remove_one(struct ib_device *device)
1330 {
1331         struct ipoib_dev_priv *priv, *tmp;
1332         struct list_head *dev_list;
1333
1334         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1335                 return;
1336
1337         dev_list = ib_get_client_data(device, &ipoib_client);
1338
1339         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1340                 ib_unregister_event_handler(&priv->event_handler);
1341                 flush_scheduled_work();
1342
1343                 unregister_netdev(priv->dev);
1344                 ipoib_dev_cleanup(priv->dev);
1345                 free_netdev(priv->dev);
1346         }
1347
1348         kfree(dev_list);
1349 }
1350
1351 static int __init ipoib_init_module(void)
1352 {
1353         int ret;
1354
1355         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1356         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1357         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1358
1359         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1360         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1361         ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
1362                                                      IPOIB_MIN_QUEUE_SIZE));
1363 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1364         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1365 #endif
1366
1367         /*
1368          * When copying small received packets, we only copy from the
1369          * linear data part of the SKB, so we rely on this condition.
1370          */
1371         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1372
1373         ret = ipoib_register_debugfs();
1374         if (ret)
1375                 return ret;
1376
1377         /*
1378          * We create our own workqueue mainly because we want to be
1379          * able to flush it when devices are being removed.  We can't
1380          * use schedule_work()/flush_scheduled_work() because both
1381          * unregister_netdev() and linkwatch_event take the rtnl lock,
1382          * so flush_scheduled_work() can deadlock during device
1383          * removal.
1384          */
1385         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1386         if (!ipoib_workqueue) {
1387                 ret = -ENOMEM;
1388                 goto err_fs;
1389         }
1390
1391         ib_sa_register_client(&ipoib_sa_client);
1392
1393         ret = ib_register_client(&ipoib_client);
1394         if (ret)
1395                 goto err_sa;
1396
1397         return 0;
1398
1399 err_sa:
1400         ib_sa_unregister_client(&ipoib_sa_client);
1401         destroy_workqueue(ipoib_workqueue);
1402
1403 err_fs:
1404         ipoib_unregister_debugfs();
1405
1406         return ret;
1407 }
1408
1409 static void __exit ipoib_cleanup_module(void)
1410 {
1411         ib_unregister_client(&ipoib_client);
1412         ib_sa_unregister_client(&ipoib_sa_client);
1413         ipoib_unregister_debugfs();
1414         destroy_workqueue(ipoib_workqueue);
1415 }
1416
1417 module_init(ipoib_init_module);
1418 module_exit(ipoib_cleanup_module);