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

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include "ipoib.h"
  36
  37 #include <linux/module.h>
  38
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/kernel.h>
  42 #include <linux/vmalloc.h>
  43
  44 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  45
  46 #include <linux/ip.h>
  47 #include <linux/in.h>
  48
  49 #include <net/dst.h>
  50
  51 MODULE_AUTHOR("Roland Dreier");
  52 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  53 MODULE_LICENSE("Dual BSD/GPL");
  54
  55 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  56 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  57
  58 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  59 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  60 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  61 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  62
  63 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_mark_paths_invalid(struct net_device *dev)
 361 {
 362         struct ipoib_dev_priv *priv = netdev_priv(dev);
 363         struct ipoib_path *path, *tp;
 364
 365         spin_lock_irq(&priv->lock);
 366
 367         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 368                 ipoib_dbg(priv, "mark path LID 0x%04x GID " IPOIB_GID_FMT " invalid\n",
 369                         be16_to_cpu(path->pathrec.dlid),
 370                         IPOIB_GID_ARG(path->pathrec.dgid));
 371                 path->valid =  0;
 372         }
 373
 374         spin_unlock_irq(&priv->lock);
 375 }
 376
 377 void ipoib_flush_paths(struct net_device *dev)
 378 {
 379         struct ipoib_dev_priv *priv = netdev_priv(dev);
 380         struct ipoib_path *path, *tp;
 381         LIST_HEAD(remove_list);
 382
 383         spin_lock_irq(&priv->tx_lock);
 384         spin_lock(&priv->lock);
 385
 386         list_splice_init(&priv->path_list, &remove_list);
 387
 388         list_for_each_entry(path, &remove_list, list)
 389                 rb_erase(&path->rb_node, &priv->path_tree);
 390
 391         list_for_each_entry_safe(path, tp, &remove_list, list) {
 392                 if (path->query)
 393                         ib_sa_cancel_query(path->query_id, path->query);
 394                 spin_unlock(&priv->lock);
 395                 spin_unlock_irq(&priv->tx_lock);
 396                 wait_for_completion(&path->done);
 397                 path_free(dev, path);
 398                 spin_lock_irq(&priv->tx_lock);
 399                 spin_lock(&priv->lock);
 400         }
 401         spin_unlock(&priv->lock);
 402         spin_unlock_irq(&priv->tx_lock);
 403 }
 404
 405 static void path_rec_completion(int status,
 406                                 struct ib_sa_path_rec *pathrec,
 407                                 void *path_ptr)
 408 {
 409         struct ipoib_path *path = path_ptr;
 410         struct net_device *dev = path->dev;
 411         struct ipoib_dev_priv *priv = netdev_priv(dev);
 412         struct ipoib_ah *ah = NULL;
 413         struct ipoib_ah *old_ah;
 414         struct ipoib_neigh *neigh, *tn;
 415         struct sk_buff_head skqueue;
 416         struct sk_buff *skb;
 417         unsigned long flags;
 418
 419         if (!status)
 420                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 421                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 422         else
 423                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 424                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 425
 426         skb_queue_head_init(&skqueue);
 427
 428         if (!status) {
 429                 struct ib_ah_attr av;
 430
 431                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 432                         ah = ipoib_create_ah(dev, priv->pd, &av);
 433         }
 434
 435         spin_lock_irqsave(&priv->lock, flags);
 436
 437         old_ah   = path->ah;
 438         path->ah = ah;
 439
 440         if (ah) {
 441                 path->pathrec = *pathrec;
 442
 443                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 444                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 445
 446                 while ((skb = __skb_dequeue(&path->queue)))
 447                         __skb_queue_tail(&skqueue, skb);
 448
 449                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 450                         if (neigh->ah) {
 451                                 WARN_ON(neigh->ah != old_ah);
 452                                 /*
 453                                  * Dropping the ah reference inside
 454                                  * priv->lock is safe here, because we
 455                                  * will hold one more reference from
 456                                  * the original value of path->ah (ie
 457                                  * old_ah).
 458                                  */
 459                                 ipoib_put_ah(neigh->ah);
 460                         }
 461                         kref_get(&path->ah->ref);
 462                         neigh->ah = path->ah;
 463                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 464                                sizeof(union ib_gid));
 465
 466                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 467                                 if (!ipoib_cm_get(neigh))
 468                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 469                                                                                path,
 470                                                                                neigh));
 471                                 if (!ipoib_cm_get(neigh)) {
 472                                         list_del(&neigh->list);
 473                                         if (neigh->ah)
 474                                                 ipoib_put_ah(neigh->ah);
 475                                         ipoib_neigh_free(dev, neigh);
 476                                         continue;
 477                                 }
 478                         }
 479
 480                         while ((skb = __skb_dequeue(&neigh->queue)))
 481                                 __skb_queue_tail(&skqueue, skb);
 482                 }
 483                 path->valid = 1;
 484         }
 485
 486         path->query = NULL;
 487         complete(&path->done);
 488
 489         spin_unlock_irqrestore(&priv->lock, flags);
 490
 491         if (old_ah)
 492                 ipoib_put_ah(old_ah);
 493
 494         while ((skb = __skb_dequeue(&skqueue))) {
 495                 skb->dev = dev;
 496                 if (dev_queue_xmit(skb))
 497                         ipoib_warn(priv, "dev_queue_xmit failed "
 498                                    "to requeue packet\n");
 499         }
 500 }
 501
 502 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 503 {
 504         struct ipoib_dev_priv *priv = netdev_priv(dev);
 505         struct ipoib_path *path;
 506
 507         if (!priv->broadcast)
 508                 return NULL;
 509
 510         path = kzalloc(sizeof *path, GFP_ATOMIC);
 511         if (!path)
 512                 return NULL;
 513
 514         path->dev = dev;
 515
 516         skb_queue_head_init(&path->queue);
 517
 518         INIT_LIST_HEAD(&path->neigh_list);
 519
 520         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 521         path->pathrec.sgid          = priv->local_gid;
 522         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 523         path->pathrec.numb_path     = 1;
 524         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 525
 526         return path;
 527 }
 528
 529 static int path_rec_start(struct net_device *dev,
 530                           struct ipoib_path *path)
 531 {
 532         struct ipoib_dev_priv *priv = netdev_priv(dev);
 533
 534         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 535                   IPOIB_GID_ARG(path->pathrec.dgid));
 536
 537         init_completion(&path->done);
 538
 539         path->query_id =
 540                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 541                                    &path->pathrec,
 542                                    IB_SA_PATH_REC_DGID          |
 543                                    IB_SA_PATH_REC_SGID          |
 544                                    IB_SA_PATH_REC_NUMB_PATH     |
 545                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 546                                    IB_SA_PATH_REC_PKEY,
 547                                    1000, GFP_ATOMIC,
 548                                    path_rec_completion,
 549                                    path, &path->query);
 550         if (path->query_id < 0) {
 551                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 552                 path->query = NULL;
 553                 return path->query_id;
 554         }
 555
 556         return 0;
 557 }
 558
 559 static void neigh_add_path(struct sk_buff *skb, 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
 565         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 566         if (!neigh) {
 567                 ++dev->stats.tx_dropped;
 568                 dev_kfree_skb_any(skb);
 569                 return;
 570         }
 571
 572         /*
 573          * We can only be called from ipoib_start_xmit, so we're
 574          * inside tx_lock -- no need to save/restore flags.
 575          */
 576         spin_lock(&priv->lock);
 577
 578         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 579         if (!path) {
 580                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 581                 if (!path)
 582                         goto err_path;
 583
 584                 __path_add(dev, path);
 585         }
 586
 587         list_add_tail(&neigh->list, &path->neigh_list);
 588
 589         if (path->ah) {
 590                 kref_get(&path->ah->ref);
 591                 neigh->ah = path->ah;
 592                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 593                        sizeof(union ib_gid));
 594
 595                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 596                         if (!ipoib_cm_get(neigh))
 597                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 598                         if (!ipoib_cm_get(neigh)) {
 599                                 list_del(&neigh->list);
 600                                 if (neigh->ah)
 601                                         ipoib_put_ah(neigh->ah);
 602                                 ipoib_neigh_free(dev, neigh);
 603                                 goto err_drop;
 604                         }
 605                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 606                                 __skb_queue_tail(&neigh->queue, skb);
 607                         else {
 608                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 609                                            skb_queue_len(&neigh->queue));
 610                                 goto err_drop;
 611                         }
 612                 } else
 613                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 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(&priv->lock);
 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(&priv->lock);
 636 }
 637
 638 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 639 {
 640         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 641
 642         /* Look up path record for unicasts */
 643         if (skb->dst->neighbour->ha[4] != 0xff) {
 644                 neigh_add_path(skb, dev);
 645                 return;
 646         }
 647
 648         /* Add in the P_Key for multicasts */
 649         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 650         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 651         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 652 }
 653
 654 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 655                              struct ipoib_pseudoheader *phdr)
 656 {
 657         struct ipoib_dev_priv *priv = netdev_priv(dev);
 658         struct ipoib_path *path;
 659
 660         /*
 661          * We can only be called from ipoib_start_xmit, so we're
 662          * inside tx_lock -- no need to save/restore flags.
 663          */
 664         spin_lock(&priv->lock);
 665
 666         path = __path_find(dev, phdr->hwaddr + 4);
 667         if (!path || !path->valid) {
 668                 if (!path)
 669                         path = path_rec_create(dev, phdr->hwaddr + 4);
 670                 if (path) {
 671                         /* put pseudoheader back on for next time */
 672                         skb_push(skb, sizeof *phdr);
 673                         __skb_queue_tail(&path->queue, skb);
 674
 675                         if (path_rec_start(dev, path)) {
 676                                 spin_unlock(&priv->lock);
 677                                 path_free(dev, path);
 678                                 return;
 679                         } else
 680                                 __path_add(dev, path);
 681                 } else {
 682                         ++dev->stats.tx_dropped;
 683                         dev_kfree_skb_any(skb);
 684                 }
 685
 686                 spin_unlock(&priv->lock);
 687                 return;
 688         }
 689
 690         if (path->ah) {
 691                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 692                           be16_to_cpu(path->pathrec.dlid));
 693
 694                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 695         } else if ((path->query || !path_rec_start(dev, path)) &&
 696                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 697                 /* put pseudoheader back on for next time */
 698                 skb_push(skb, sizeof *phdr);
 699                 __skb_queue_tail(&path->queue, skb);
 700         } else {
 701                 ++dev->stats.tx_dropped;
 702                 dev_kfree_skb_any(skb);
 703         }
 704
 705         spin_unlock(&priv->lock);
 706 }
 707
 708 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 709 {
 710         struct ipoib_dev_priv *priv = netdev_priv(dev);
 711         struct ipoib_neigh *neigh;
 712         unsigned long flags;
 713
 714         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 715                 return NETDEV_TX_LOCKED;
 716
 717         if (likely(skb->dst && skb->dst->neighbour)) {
 718                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 719                         ipoib_path_lookup(skb, dev);
 720                         goto out;
 721                 }
 722
 723                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 724
 725                 if (neigh->ah)
 726                         if (unlikely((memcmp(&neigh->dgid.raw,
 727                                             skb->dst->neighbour->ha + 4,
 728                                             sizeof(union ib_gid))) ||
 729                                          (neigh->dev != dev))) {
 730                                 spin_lock(&priv->lock);
 731                                 /*
 732                                  * It's safe to call ipoib_put_ah() inside
 733                                  * priv->lock here, because we know that
 734                                  * path->ah will always hold one more reference,
 735                                  * so ipoib_put_ah() will never do more than
 736                                  * decrement the ref count.
 737                                  */
 738                                 ipoib_put_ah(neigh->ah);
 739                                 list_del(&neigh->list);
 740                                 ipoib_neigh_free(dev, neigh);
 741                                 spin_unlock(&priv->lock);
 742                                 ipoib_path_lookup(skb, dev);
 743                                 goto out;
 744                         }
 745
 746                 if (ipoib_cm_get(neigh)) {
 747                         if (ipoib_cm_up(neigh)) {
 748                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 749                                 goto out;
 750                         }
 751                 } else if (neigh->ah) {
 752                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 753                         goto out;
 754                 }
 755
 756                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 757                         spin_lock(&priv->lock);
 758                         __skb_queue_tail(&neigh->queue, skb);
 759                         spin_unlock(&priv->lock);
 760                 } else {
 761                         ++dev->stats.tx_dropped;
 762                         dev_kfree_skb_any(skb);
 763                 }
 764         } else {
 765                 struct ipoib_pseudoheader *phdr =
 766                         (struct ipoib_pseudoheader *) skb->data;
 767                 skb_pull(skb, sizeof *phdr);
 768
 769                 if (phdr->hwaddr[4] == 0xff) {
 770                         /* Add in the P_Key for multicast*/
 771                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 772                         phdr->hwaddr[9] = priv->pkey & 0xff;
 773
 774                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 775                 } else {
 776                         /* unicast GID -- should be ARP or RARP reply */
 777
 778                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 779                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 780                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 781                                            IPOIB_GID_FMT "\n",
 782                                            skb->dst ? "neigh" : "dst",
 783                                            be16_to_cpup((__be16 *) skb->data),
 784                                            IPOIB_QPN(phdr->hwaddr),
 785                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 786                                 dev_kfree_skb_any(skb);
 787                                 ++dev->stats.tx_dropped;
 788                                 goto out;
 789                         }
 790
 791                         unicast_arp_send(skb, dev, phdr);
 792                 }
 793         }
 794
 795 out:
 796         spin_unlock_irqrestore(&priv->tx_lock, flags);
 797
 798         return NETDEV_TX_OK;
 799 }
 800
 801 static void ipoib_timeout(struct net_device *dev)
 802 {
 803         struct ipoib_dev_priv *priv = netdev_priv(dev);
 804
 805         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 806                    jiffies_to_msecs(jiffies - dev->trans_start));
 807         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 808                    netif_queue_stopped(dev),
 809                    priv->tx_head, priv->tx_tail);
 810         /* XXX reset QP, etc. */
 811 }
 812
 813 static int ipoib_hard_header(struct sk_buff *skb,
 814                              struct net_device *dev,
 815                              unsigned short type,
 816                              const void *daddr, const void *saddr, unsigned len)
 817 {
 818         struct ipoib_header *header;
 819
 820         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 821
 822         header->proto = htons(type);
 823         header->reserved = 0;
 824
 825         /*
 826          * If we don't have a neighbour structure, stuff the
 827          * destination address onto the front of the skb so we can
 828          * figure out where to send the packet later.
 829          */
 830         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 831                 struct ipoib_pseudoheader *phdr =
 832                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 833                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 834         }
 835
 836         return 0;
 837 }
 838
 839 static void ipoib_set_mcast_list(struct net_device *dev)
 840 {
 841         struct ipoib_dev_priv *priv = netdev_priv(dev);
 842
 843         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 844                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 845                 return;
 846         }
 847
 848         queue_work(ipoib_workqueue, &priv->restart_task);
 849 }
 850
 851 static void ipoib_neigh_cleanup(struct neighbour *n)
 852 {
 853         struct ipoib_neigh *neigh;
 854         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 855         unsigned long flags;
 856         struct ipoib_ah *ah = NULL;
 857
 858         neigh = *to_ipoib_neigh(n);
 859         if (neigh)
 860                 priv = netdev_priv(neigh->dev);
 861         else
 862                 return;
 863         ipoib_dbg(priv,
 864                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 865                   IPOIB_QPN(n->ha),
 866                   IPOIB_GID_RAW_ARG(n->ha + 4));
 867
 868         spin_lock_irqsave(&priv->lock, flags);
 869
 870         if (neigh->ah)
 871                 ah = neigh->ah;
 872         list_del(&neigh->list);
 873         ipoib_neigh_free(n->dev, neigh);
 874
 875         spin_unlock_irqrestore(&priv->lock, flags);
 876
 877         if (ah)
 878                 ipoib_put_ah(ah);
 879 }
 880
 881 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 882                                       struct net_device *dev)
 883 {
 884         struct ipoib_neigh *neigh;
 885
 886         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 887         if (!neigh)
 888                 return NULL;
 889
 890         neigh->neighbour = neighbour;
 891         neigh->dev = dev;
 892         *to_ipoib_neigh(neighbour) = neigh;
 893         skb_queue_head_init(&neigh->queue);
 894         ipoib_cm_set(neigh, NULL);
 895
 896         return neigh;
 897 }
 898
 899 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 900 {
 901         struct sk_buff *skb;
 902         *to_ipoib_neigh(neigh->neighbour) = NULL;
 903         while ((skb = __skb_dequeue(&neigh->queue))) {
 904                 ++dev->stats.tx_dropped;
 905                 dev_kfree_skb_any(skb);
 906         }
 907         if (ipoib_cm_get(neigh))
 908                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 909         kfree(neigh);
 910 }
 911
 912 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 913 {
 914         parms->neigh_cleanup = ipoib_neigh_cleanup;
 915
 916         return 0;
 917 }
 918
 919 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 920 {
 921         struct ipoib_dev_priv *priv = netdev_priv(dev);
 922
 923         /* Allocate RX/TX "rings" to hold queued skbs */
 924         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 925                                 GFP_KERNEL);
 926         if (!priv->rx_ring) {
 927                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 928                        ca->name, ipoib_recvq_size);
 929                 goto out;
 930         }
 931
 932         priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
 933         if (!priv->tx_ring) {
 934                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 935                        ca->name, ipoib_sendq_size);
 936                 goto out_rx_ring_cleanup;
 937         }
 938         memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
 939
 940         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 941
 942         if (ipoib_ib_dev_init(dev, ca, port))
 943                 goto out_tx_ring_cleanup;
 944
 945         return 0;
 946
 947 out_tx_ring_cleanup:
 948         vfree(priv->tx_ring);
 949
 950 out_rx_ring_cleanup:
 951         kfree(priv->rx_ring);
 952
 953 out:
 954         return -ENOMEM;
 955 }
 956
 957 void ipoib_dev_cleanup(struct net_device *dev)
 958 {
 959         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 960
 961         ipoib_delete_debug_files(dev);
 962
 963         /* Delete any child interfaces first */
 964         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 965                 unregister_netdev(cpriv->dev);
 966                 ipoib_dev_cleanup(cpriv->dev);
 967                 free_netdev(cpriv->dev);
 968         }
 969
 970         ipoib_ib_dev_cleanup(dev);
 971
 972         kfree(priv->rx_ring);
 973         vfree(priv->tx_ring);
 974
 975         priv->rx_ring = NULL;
 976         priv->tx_ring = NULL;
 977 }
 978
 979 static const struct header_ops ipoib_header_ops = {
 980         .create = ipoib_hard_header,
 981 };
 982
 983 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
 984                        void **tcph, u64 *hdr_flags, void *priv)
 985 {
 986         unsigned int ip_len;
 987         struct iphdr *iph;
 988
 989         if (unlikely(skb->protocol != htons(ETH_P_IP)))
 990                 return -1;
 991
 992         /*
 993          * In the future we may add an else clause that verifies the
 994          * checksum and allows devices which do not calculate checksum
 995          * to use LRO.
 996          */
 997         if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY))
 998                 return -1;
 999
1000         /* Check for non-TCP packet */
1001         skb_reset_network_header(skb);
1002         iph = ip_hdr(skb);
1003         if (iph->protocol != IPPROTO_TCP)
1004                 return -1;
1005
1006         ip_len = ip_hdrlen(skb);
1007         skb_set_transport_header(skb, ip_len);
1008         *tcph = tcp_hdr(skb);
1009
1010         /* check if IP header and TCP header are complete */
1011         if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
1012                 return -1;
1013
1014         *hdr_flags = LRO_IPV4 | LRO_TCP;
1015         *iphdr = iph;
1016
1017         return 0;
1018 }
1019
1020 static void ipoib_lro_setup(struct ipoib_dev_priv *priv)
1021 {
1022         priv->lro.lro_mgr.max_aggr       = lro_max_aggr;
1023         priv->lro.lro_mgr.max_desc       = IPOIB_MAX_LRO_DESCRIPTORS;
1024         priv->lro.lro_mgr.lro_arr        = priv->lro.lro_desc;
1025         priv->lro.lro_mgr.get_skb_header = get_skb_hdr;
1026         priv->lro.lro_mgr.features       = LRO_F_NAPI;
1027         priv->lro.lro_mgr.dev            = priv->dev;
1028         priv->lro.lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1029 }
1030
1031 static void ipoib_setup(struct net_device *dev)
1032 {
1033         struct ipoib_dev_priv *priv = netdev_priv(dev);
1034
1035         dev->open                = ipoib_open;
1036         dev->stop                = ipoib_stop;
1037         dev->change_mtu          = ipoib_change_mtu;
1038         dev->hard_start_xmit     = ipoib_start_xmit;
1039         dev->tx_timeout          = ipoib_timeout;
1040         dev->header_ops          = &ipoib_header_ops;
1041         dev->set_multicast_list  = ipoib_set_mcast_list;
1042         dev->neigh_setup         = ipoib_neigh_setup_dev;
1043
1044         ipoib_set_ethtool_ops(dev);
1045
1046         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1047
1048         dev->watchdog_timeo      = HZ;
1049
1050         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1051
1052         /*
1053          * We add in INFINIBAND_ALEN to allow for the destination
1054          * address "pseudoheader" for skbs without neighbour struct.
1055          */
1056         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1057         dev->addr_len            = INFINIBAND_ALEN;
1058         dev->type                = ARPHRD_INFINIBAND;
1059         dev->tx_queue_len        = ipoib_sendq_size * 2;
1060         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1061                                     NETIF_F_LLTX                |
1062                                     NETIF_F_HIGHDMA);
1063
1064         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1065
1066         netif_carrier_off(dev);
1067
1068         priv->dev = dev;
1069
1070         ipoib_lro_setup(priv);
1071
1072         spin_lock_init(&priv->lock);
1073         spin_lock_init(&priv->tx_lock);
1074
1075         mutex_init(&priv->vlan_mutex);
1076
1077         INIT_LIST_HEAD(&priv->path_list);
1078         INIT_LIST_HEAD(&priv->child_intfs);
1079         INIT_LIST_HEAD(&priv->dead_ahs);
1080         INIT_LIST_HEAD(&priv->multicast_list);
1081
1082         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1083         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1084         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1085         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1086         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1087         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1088         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1089 }
1090
1091 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1092 {
1093         struct net_device *dev;
1094
1095         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1096                            ipoib_setup);
1097         if (!dev)
1098                 return NULL;
1099
1100         return netdev_priv(dev);
1101 }
1102
1103 static ssize_t show_pkey(struct device *dev,
1104                          struct device_attribute *attr, char *buf)
1105 {
1106         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1107
1108         return sprintf(buf, "0x%04x\n", priv->pkey);
1109 }
1110 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1111
1112 static ssize_t show_umcast(struct device *dev,
1113                            struct device_attribute *attr, char *buf)
1114 {
1115         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1116
1117         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1118 }
1119
1120 static ssize_t set_umcast(struct device *dev,
1121                           struct device_attribute *attr,
1122                           const char *buf, size_t count)
1123 {
1124         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1125         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1126
1127         if (umcast_val > 0) {
1128                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1129                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1130                                 "by userspace\n");
1131         } else
1132                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1133
1134         return count;
1135 }
1136 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1137
1138 int ipoib_add_umcast_attr(struct net_device *dev)
1139 {
1140         return device_create_file(&dev->dev, &dev_attr_umcast);
1141 }
1142
1143 static ssize_t create_child(struct device *dev,
1144                             struct device_attribute *attr,
1145                             const char *buf, size_t count)
1146 {
1147         int pkey;
1148         int ret;
1149
1150         if (sscanf(buf, "%i", &pkey) != 1)
1151                 return -EINVAL;
1152
1153         if (pkey < 0 || pkey > 0xffff)
1154                 return -EINVAL;
1155
1156         /*
1157          * Set the full membership bit, so that we join the right
1158          * broadcast group, etc.
1159          */
1160         pkey |= 0x8000;
1161
1162         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1163
1164         return ret ? ret : count;
1165 }
1166 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1167
1168 static ssize_t delete_child(struct device *dev,
1169                             struct device_attribute *attr,
1170                             const char *buf, size_t count)
1171 {
1172         int pkey;
1173         int ret;
1174
1175         if (sscanf(buf, "%i", &pkey) != 1)
1176                 return -EINVAL;
1177
1178         if (pkey < 0 || pkey > 0xffff)
1179                 return -EINVAL;
1180
1181         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1182
1183         return ret ? ret : count;
1184
1185 }
1186 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1187
1188 int ipoib_add_pkey_attr(struct net_device *dev)
1189 {
1190         return device_create_file(&dev->dev, &dev_attr_pkey);
1191 }
1192
1193 static struct net_device *ipoib_add_port(const char *format,
1194                                          struct ib_device *hca, u8 port)
1195 {
1196         struct ipoib_dev_priv *priv;
1197         struct ib_device_attr *device_attr;
1198         struct ib_port_attr attr;
1199         int result = -ENOMEM;
1200
1201         priv = ipoib_intf_alloc(format);
1202         if (!priv)
1203                 goto alloc_mem_failed;
1204
1205         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1206
1207         if (!ib_query_port(hca, port, &attr))
1208                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1209         else {
1210                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1211                        hca->name, port);
1212                 goto device_init_failed;
1213         }
1214
1215         /* MTU will be reset when mcast join happens */
1216         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1217         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1218
1219         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1220         if (result) {
1221                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1222                        hca->name, port, result);
1223                 goto device_init_failed;
1224         }
1225
1226         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1227         if (!device_attr) {
1228                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1229                        hca->name, sizeof *device_attr);
1230                 goto device_init_failed;
1231         }
1232
1233         result = ib_query_device(hca, device_attr);
1234         if (result) {
1235                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1236                        hca->name, result);
1237                 kfree(device_attr);
1238                 goto device_init_failed;
1239         }
1240         priv->hca_caps = device_attr->device_cap_flags;
1241
1242         kfree(device_attr);
1243
1244         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1245                 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1246                 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1247         }
1248
1249         if (lro)
1250                 priv->dev->features |= NETIF_F_LRO;
1251
1252         /*
1253          * Set the full membership bit, so that we join the right
1254          * broadcast group, etc.
1255          */
1256         priv->pkey |= 0x8000;
1257
1258         priv->dev->broadcast[8] = priv->pkey >> 8;
1259         priv->dev->broadcast[9] = priv->pkey & 0xff;
1260
1261         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1262         if (result) {
1263                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1264                        hca->name, port, result);
1265                 goto device_init_failed;
1266         } else
1267                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1268
1269         result = ipoib_dev_init(priv->dev, hca, port);
1270         if (result < 0) {
1271                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1272                        hca->name, port, result);
1273                 goto device_init_failed;
1274         }
1275
1276         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1277                               priv->ca, ipoib_event);
1278         result = ib_register_event_handler(&priv->event_handler);
1279         if (result < 0) {
1280                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1281                        "port %d (ret = %d)\n",
1282                        hca->name, port, result);
1283                 goto event_failed;
1284         }
1285
1286         if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1287                 priv->dev->features |= NETIF_F_TSO;
1288
1289         result = register_netdev(priv->dev);
1290         if (result) {
1291                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1292                        hca->name, port, result);
1293                 goto register_failed;
1294         }
1295
1296         ipoib_create_debug_files(priv->dev);
1297
1298         if (ipoib_cm_add_mode_attr(priv->dev))
1299                 goto sysfs_failed;
1300         if (ipoib_add_pkey_attr(priv->dev))
1301                 goto sysfs_failed;
1302         if (ipoib_add_umcast_attr(priv->dev))
1303                 goto sysfs_failed;
1304         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1305                 goto sysfs_failed;
1306         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1307                 goto sysfs_failed;
1308
1309         return priv->dev;
1310
1311 sysfs_failed:
1312         ipoib_delete_debug_files(priv->dev);
1313         unregister_netdev(priv->dev);
1314
1315 register_failed:
1316         ib_unregister_event_handler(&priv->event_handler);
1317         flush_scheduled_work();
1318
1319 event_failed:
1320         ipoib_dev_cleanup(priv->dev);
1321
1322 device_init_failed:
1323         free_netdev(priv->dev);
1324
1325 alloc_mem_failed:
1326         return ERR_PTR(result);
1327 }
1328
1329 static void ipoib_add_one(struct ib_device *device)
1330 {
1331         struct list_head *dev_list;
1332         struct net_device *dev;
1333         struct ipoib_dev_priv *priv;
1334         int s, e, p;
1335
1336         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1337                 return;
1338
1339         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1340         if (!dev_list)
1341                 return;
1342
1343         INIT_LIST_HEAD(dev_list);
1344
1345         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1346                 s = 0;
1347                 e = 0;
1348         } else {
1349                 s = 1;
1350                 e = device->phys_port_cnt;
1351         }
1352
1353         for (p = s; p <= e; ++p) {
1354                 dev = ipoib_add_port("ib%d", device, p);
1355                 if (!IS_ERR(dev)) {
1356                         priv = netdev_priv(dev);
1357                         list_add_tail(&priv->list, dev_list);
1358                 }
1359         }
1360
1361         ib_set_client_data(device, &ipoib_client, dev_list);
1362 }
1363
1364 static void ipoib_remove_one(struct ib_device *device)
1365 {
1366         struct ipoib_dev_priv *priv, *tmp;
1367         struct list_head *dev_list;
1368
1369         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1370                 return;
1371
1372         dev_list = ib_get_client_data(device, &ipoib_client);
1373
1374         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1375                 ib_unregister_event_handler(&priv->event_handler);
1376                 flush_scheduled_work();
1377
1378                 unregister_netdev(priv->dev);
1379                 ipoib_dev_cleanup(priv->dev);
1380                 free_netdev(priv->dev);
1381         }
1382
1383         kfree(dev_list);
1384 }
1385
1386 static int __init ipoib_init_module(void)
1387 {
1388         int ret;
1389
1390         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1391         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1392         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1393
1394         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1395         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1396         ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
1397                                                      IPOIB_MIN_QUEUE_SIZE));
1398 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1399         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1400 #endif
1401
1402         /*
1403          * When copying small received packets, we only copy from the
1404          * linear data part of the SKB, so we rely on this condition.
1405          */
1406         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1407
1408         ret = ipoib_register_debugfs();
1409         if (ret)
1410                 return ret;
1411
1412         /*
1413          * We create our own workqueue mainly because we want to be
1414          * able to flush it when devices are being removed.  We can't
1415          * use schedule_work()/flush_scheduled_work() because both
1416          * unregister_netdev() and linkwatch_event take the rtnl lock,
1417          * so flush_scheduled_work() can deadlock during device
1418          * removal.
1419          */
1420         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1421         if (!ipoib_workqueue) {
1422                 ret = -ENOMEM;
1423                 goto err_fs;
1424         }
1425
1426         ib_sa_register_client(&ipoib_sa_client);
1427
1428         ret = ib_register_client(&ipoib_client);
1429         if (ret)
1430                 goto err_sa;
1431
1432         return 0;
1433
1434 err_sa:
1435         ib_sa_unregister_client(&ipoib_sa_client);
1436         destroy_workqueue(ipoib_workqueue);
1437
1438 err_fs:
1439         ipoib_unregister_debugfs();
1440
1441         return ret;
1442 }
1443
1444 static void __exit ipoib_cleanup_module(void)
1445 {
1446         ib_unregister_client(&ipoib_client);
1447         ib_sa_unregister_client(&ipoib_sa_client);
1448         ipoib_unregister_debugfs();
1449         destroy_workqueue(ipoib_workqueue);
1450 }
1451
1452 module_init(ipoib_init_module);
1453 module_exit(ipoib_cleanup_module);