drivers/infiniband/ulp/ipoib/ipoib_main.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
  35  */
  36
  37 #include "ipoib.h"
  38
  39 #include <linux/module.h>
  40
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/kernel.h>
  44
  45 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  46
  47 #include <linux/ip.h>
  48 #include <linux/in.h>
  49
  50 #include <net/dst.h>
  51
  52 #define IPOIB_QPN(ha) (be32_to_cpup((__be32 *) ha) & 0xffffff)
  53
  54 MODULE_AUTHOR("Roland Dreier");
  55 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  56 MODULE_LICENSE("Dual BSD/GPL");
  57
  58 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  59 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  60
  61 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  62 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  63 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  64 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  65
  66 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  67 int ipoib_debug_level;
  68
  69 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  70 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  71 #endif
  72
  73 struct ipoib_path_iter {
  74         struct net_device *dev;
  75         struct ipoib_path  path;
  76 };
  77
  78 static const u8 ipv4_bcast_addr[] = {
  79         0x00, 0xff, 0xff, 0xff,
  80         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  81         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  82 };
  83
  84 struct workqueue_struct *ipoib_workqueue;
  85
  86 struct ib_sa_client ipoib_sa_client;
  87
  88 static void ipoib_add_one(struct ib_device *device);
  89 static void ipoib_remove_one(struct ib_device *device);
  90
  91 static struct ib_client ipoib_client = {
  92         .name   = "ipoib",
  93         .add    = ipoib_add_one,
  94         .remove = ipoib_remove_one
  95 };
  96
  97 int ipoib_open(struct net_device *dev)
  98 {
  99         struct ipoib_dev_priv *priv = netdev_priv(dev);
 100
 101         ipoib_dbg(priv, "bringing up interface\n");
 102
 103         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 104
 105         if (ipoib_pkey_dev_delay_open(dev))
 106                 return 0;
 107
 108         if (ipoib_ib_dev_open(dev))
 109                 return -EINVAL;
 110
 111         if (ipoib_ib_dev_up(dev)) {
 112                 ipoib_ib_dev_stop(dev);
 113                 return -EINVAL;
 114         }
 115
 116         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 117                 struct ipoib_dev_priv *cpriv;
 118
 119                 /* Bring up any child interfaces too */
 120                 mutex_lock(&priv->vlan_mutex);
 121                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 122                         int flags;
 123
 124                         flags = cpriv->dev->flags;
 125                         if (flags & IFF_UP)
 126                                 continue;
 127
 128                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 129                 }
 130                 mutex_unlock(&priv->vlan_mutex);
 131         }
 132
 133         netif_start_queue(dev);
 134
 135         return 0;
 136 }
 137
 138 static int ipoib_stop(struct net_device *dev)
 139 {
 140         struct ipoib_dev_priv *priv = netdev_priv(dev);
 141
 142         ipoib_dbg(priv, "stopping interface\n");
 143
 144         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 145
 146         netif_stop_queue(dev);
 147
 148         /*
 149          * Now flush workqueue to make sure a scheduled task doesn't
 150          * bring our internal state back up.
 151          */
 152         flush_workqueue(ipoib_workqueue);
 153
 154         ipoib_ib_dev_down(dev, 1);
 155         ipoib_ib_dev_stop(dev);
 156
 157         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 158                 struct ipoib_dev_priv *cpriv;
 159
 160                 /* Bring down any child interfaces too */
 161                 mutex_lock(&priv->vlan_mutex);
 162                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 163                         int flags;
 164
 165                         flags = cpriv->dev->flags;
 166                         if (!(flags & IFF_UP))
 167                                 continue;
 168
 169                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 170                 }
 171                 mutex_unlock(&priv->vlan_mutex);
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 178 {
 179         struct ipoib_dev_priv *priv = netdev_priv(dev);
 180
 181         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
 182                 return -EINVAL;
 183
 184         priv->admin_mtu = new_mtu;
 185
 186         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 187
 188         return 0;
 189 }
 190
 191 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 192 {
 193         struct ipoib_dev_priv *priv = netdev_priv(dev);
 194         struct rb_node *n = priv->path_tree.rb_node;
 195         struct ipoib_path *path;
 196         int ret;
 197
 198         while (n) {
 199                 path = rb_entry(n, struct ipoib_path, rb_node);
 200
 201                 ret = memcmp(gid, path->pathrec.dgid.raw,
 202                              sizeof (union ib_gid));
 203
 204                 if (ret < 0)
 205                         n = n->rb_left;
 206                 else if (ret > 0)
 207                         n = n->rb_right;
 208                 else
 209                         return path;
 210         }
 211
 212         return NULL;
 213 }
 214
 215 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 216 {
 217         struct ipoib_dev_priv *priv = netdev_priv(dev);
 218         struct rb_node **n = &priv->path_tree.rb_node;
 219         struct rb_node *pn = NULL;
 220         struct ipoib_path *tpath;
 221         int ret;
 222
 223         while (*n) {
 224                 pn = *n;
 225                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 226
 227                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 228                              sizeof (union ib_gid));
 229                 if (ret < 0)
 230                         n = &pn->rb_left;
 231                 else if (ret > 0)
 232                         n = &pn->rb_right;
 233                 else
 234                         return -EEXIST;
 235         }
 236
 237         rb_link_node(&path->rb_node, pn, n);
 238         rb_insert_color(&path->rb_node, &priv->path_tree);
 239
 240         list_add_tail(&path->list, &priv->path_list);
 241
 242         return 0;
 243 }
 244
 245 static void path_free(struct net_device *dev, struct ipoib_path *path)
 246 {
 247         struct ipoib_dev_priv *priv = netdev_priv(dev);
 248         struct ipoib_neigh *neigh, *tn;
 249         struct sk_buff *skb;
 250         unsigned long flags;
 251
 252         while ((skb = __skb_dequeue(&path->queue)))
 253                 dev_kfree_skb_irq(skb);
 254
 255         spin_lock_irqsave(&priv->lock, flags);
 256
 257         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 258                 /*
 259                  * It's safe to call ipoib_put_ah() inside priv->lock
 260                  * here, because we know that path->ah will always
 261                  * hold one more reference, so ipoib_put_ah() will
 262                  * never do more than decrement the ref count.
 263                  */
 264                 if (neigh->ah)
 265                         ipoib_put_ah(neigh->ah);
 266
 267                 ipoib_neigh_free(neigh);
 268         }
 269
 270         spin_unlock_irqrestore(&priv->lock, flags);
 271
 272         if (path->ah)
 273                 ipoib_put_ah(path->ah);
 274
 275         kfree(path);
 276 }
 277
 278 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 279
 280 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 281 {
 282         struct ipoib_path_iter *iter;
 283
 284         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 285         if (!iter)
 286                 return NULL;
 287
 288         iter->dev = dev;
 289         memset(iter->path.pathrec.dgid.raw, 0, 16);
 290
 291         if (ipoib_path_iter_next(iter)) {
 292                 kfree(iter);
 293                 return NULL;
 294         }
 295
 296         return iter;
 297 }
 298
 299 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 300 {
 301         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 302         struct rb_node *n;
 303         struct ipoib_path *path;
 304         int ret = 1;
 305
 306         spin_lock_irq(&priv->lock);
 307
 308         n = rb_first(&priv->path_tree);
 309
 310         while (n) {
 311                 path = rb_entry(n, struct ipoib_path, rb_node);
 312
 313                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 314                            sizeof (union ib_gid)) < 0) {
 315                         iter->path = *path;
 316                         ret = 0;
 317                         break;
 318                 }
 319
 320                 n = rb_next(n);
 321         }
 322
 323         spin_unlock_irq(&priv->lock);
 324
 325         return ret;
 326 }
 327
 328 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 329                           struct ipoib_path *path)
 330 {
 331         *path = iter->path;
 332 }
 333
 334 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 335
 336 void ipoib_flush_paths(struct net_device *dev)
 337 {
 338         struct ipoib_dev_priv *priv = netdev_priv(dev);
 339         struct ipoib_path *path, *tp;
 340         LIST_HEAD(remove_list);
 341
 342         spin_lock_irq(&priv->tx_lock);
 343         spin_lock(&priv->lock);
 344
 345         list_splice(&priv->path_list, &remove_list);
 346         INIT_LIST_HEAD(&priv->path_list);
 347
 348         list_for_each_entry(path, &remove_list, list)
 349                 rb_erase(&path->rb_node, &priv->path_tree);
 350
 351         list_for_each_entry_safe(path, tp, &remove_list, list) {
 352                 if (path->query)
 353                         ib_sa_cancel_query(path->query_id, path->query);
 354                 spin_unlock(&priv->lock);
 355                 spin_unlock_irq(&priv->tx_lock);
 356                 wait_for_completion(&path->done);
 357                 path_free(dev, path);
 358                 spin_lock_irq(&priv->tx_lock);
 359                 spin_lock(&priv->lock);
 360         }
 361         spin_unlock(&priv->lock);
 362         spin_unlock_irq(&priv->tx_lock);
 363 }
 364
 365 static void path_rec_completion(int status,
 366                                 struct ib_sa_path_rec *pathrec,
 367                                 void *path_ptr)
 368 {
 369         struct ipoib_path *path = path_ptr;
 370         struct net_device *dev = path->dev;
 371         struct ipoib_dev_priv *priv = netdev_priv(dev);
 372         struct ipoib_ah *ah = NULL;
 373         struct ipoib_neigh *neigh;
 374         struct sk_buff_head skqueue;
 375         struct sk_buff *skb;
 376         unsigned long flags;
 377
 378         if (pathrec)
 379                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 380                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 381         else
 382                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 383                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 384
 385         skb_queue_head_init(&skqueue);
 386
 387         if (!status) {
 388                 struct ib_ah_attr av = {
 389                         .dlid          = be16_to_cpu(pathrec->dlid),
 390                         .sl            = pathrec->sl,
 391                         .port_num      = priv->port,
 392                         .static_rate   = pathrec->rate
 393                 };
 394
 395                 ah = ipoib_create_ah(dev, priv->pd, &av);
 396         }
 397
 398         spin_lock_irqsave(&priv->lock, flags);
 399
 400         path->ah = ah;
 401
 402         if (ah) {
 403                 path->pathrec = *pathrec;
 404
 405                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 406                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 407
 408                 while ((skb = __skb_dequeue(&path->queue)))
 409                         __skb_queue_tail(&skqueue, skb);
 410
 411                 list_for_each_entry(neigh, &path->neigh_list, list) {
 412                         kref_get(&path->ah->ref);
 413                         neigh->ah = path->ah;
 414                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 415                                sizeof(union ib_gid));
 416
 417                         while ((skb = __skb_dequeue(&neigh->queue)))
 418                                 __skb_queue_tail(&skqueue, skb);
 419                 }
 420         }
 421
 422         path->query = NULL;
 423         complete(&path->done);
 424
 425         spin_unlock_irqrestore(&priv->lock, flags);
 426
 427         while ((skb = __skb_dequeue(&skqueue))) {
 428                 skb->dev = dev;
 429                 if (dev_queue_xmit(skb))
 430                         ipoib_warn(priv, "dev_queue_xmit failed "
 431                                    "to requeue packet\n");
 432         }
 433 }
 434
 435 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 436 {
 437         struct ipoib_dev_priv *priv = netdev_priv(dev);
 438         struct ipoib_path *path;
 439
 440         path = kzalloc(sizeof *path, GFP_ATOMIC);
 441         if (!path)
 442                 return NULL;
 443
 444         path->dev = dev;
 445
 446         skb_queue_head_init(&path->queue);
 447
 448         INIT_LIST_HEAD(&path->neigh_list);
 449
 450         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 451         path->pathrec.sgid      = priv->local_gid;
 452         path->pathrec.pkey      = cpu_to_be16(priv->pkey);
 453         path->pathrec.numb_path = 1;
 454
 455         return path;
 456 }
 457
 458 static int path_rec_start(struct net_device *dev,
 459                           struct ipoib_path *path)
 460 {
 461         struct ipoib_dev_priv *priv = netdev_priv(dev);
 462
 463         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 464                   IPOIB_GID_ARG(path->pathrec.dgid));
 465
 466         init_completion(&path->done);
 467
 468         path->query_id =
 469                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 470                                    &path->pathrec,
 471                                    IB_SA_PATH_REC_DGID          |
 472                                    IB_SA_PATH_REC_SGID          |
 473                                    IB_SA_PATH_REC_NUMB_PATH     |
 474                                    IB_SA_PATH_REC_PKEY,
 475                                    1000, GFP_ATOMIC,
 476                                    path_rec_completion,
 477                                    path, &path->query);
 478         if (path->query_id < 0) {
 479                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 480                 path->query = NULL;
 481                 return path->query_id;
 482         }
 483
 484         return 0;
 485 }
 486
 487 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 488 {
 489         struct ipoib_dev_priv *priv = netdev_priv(dev);
 490         struct ipoib_path *path;
 491         struct ipoib_neigh *neigh;
 492
 493         neigh = ipoib_neigh_alloc(skb->dst->neighbour);
 494         if (!neigh) {
 495                 ++priv->stats.tx_dropped;
 496                 dev_kfree_skb_any(skb);
 497                 return;
 498         }
 499
 500         skb_queue_head_init(&neigh->queue);
 501
 502         /*
 503          * We can only be called from ipoib_start_xmit, so we're
 504          * inside tx_lock -- no need to save/restore flags.
 505          */
 506         spin_lock(&priv->lock);
 507
 508         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 509         if (!path) {
 510                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 511                 if (!path)
 512                         goto err_path;
 513
 514                 __path_add(dev, path);
 515         }
 516
 517         list_add_tail(&neigh->list, &path->neigh_list);
 518
 519         if (path->ah) {
 520                 kref_get(&path->ah->ref);
 521                 neigh->ah = path->ah;
 522                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 523                        sizeof(union ib_gid));
 524
 525                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 526         } else {
 527                 neigh->ah  = NULL;
 528                 __skb_queue_tail(&neigh->queue, skb);
 529
 530                 if (!path->query && path_rec_start(dev, path))
 531                         goto err_list;
 532         }
 533
 534         spin_unlock(&priv->lock);
 535         return;
 536
 537 err_list:
 538         list_del(&neigh->list);
 539
 540 err_path:
 541         ipoib_neigh_free(neigh);
 542         ++priv->stats.tx_dropped;
 543         dev_kfree_skb_any(skb);
 544
 545         spin_unlock(&priv->lock);
 546 }
 547
 548 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 549 {
 550         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 551
 552         /* Look up path record for unicasts */
 553         if (skb->dst->neighbour->ha[4] != 0xff) {
 554                 neigh_add_path(skb, dev);
 555                 return;
 556         }
 557
 558         /* Add in the P_Key for multicasts */
 559         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 560         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 561         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 562 }
 563
 564 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 565                              struct ipoib_pseudoheader *phdr)
 566 {
 567         struct ipoib_dev_priv *priv = netdev_priv(dev);
 568         struct ipoib_path *path;
 569
 570         /*
 571          * We can only be called from ipoib_start_xmit, so we're
 572          * inside tx_lock -- no need to save/restore flags.
 573          */
 574         spin_lock(&priv->lock);
 575
 576         path = __path_find(dev, phdr->hwaddr + 4);
 577         if (!path) {
 578                 path = path_rec_create(dev, phdr->hwaddr + 4);
 579                 if (path) {
 580                         /* put pseudoheader back on for next time */
 581                         skb_push(skb, sizeof *phdr);
 582                         __skb_queue_tail(&path->queue, skb);
 583
 584                         if (path_rec_start(dev, path)) {
 585                                 spin_unlock(&priv->lock);
 586                                 path_free(dev, path);
 587                                 return;
 588                         } else
 589                                 __path_add(dev, path);
 590                 } else {
 591                         ++priv->stats.tx_dropped;
 592                         dev_kfree_skb_any(skb);
 593                 }
 594
 595                 spin_unlock(&priv->lock);
 596                 return;
 597         }
 598
 599         if (path->ah) {
 600                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 601                           be16_to_cpu(path->pathrec.dlid));
 602
 603                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 604         } else if ((path->query || !path_rec_start(dev, path)) &&
 605                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 606                 /* put pseudoheader back on for next time */
 607                 skb_push(skb, sizeof *phdr);
 608                 __skb_queue_tail(&path->queue, skb);
 609         } else {
 610                 ++priv->stats.tx_dropped;
 611                 dev_kfree_skb_any(skb);
 612         }
 613
 614         spin_unlock(&priv->lock);
 615 }
 616
 617 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 618 {
 619         struct ipoib_dev_priv *priv = netdev_priv(dev);
 620         struct ipoib_neigh *neigh;
 621         unsigned long flags;
 622
 623         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 624                 return NETDEV_TX_LOCKED;
 625
 626         /*
 627          * Check if our queue is stopped.  Since we have the LLTX bit
 628          * set, we can't rely on netif_stop_queue() preventing our
 629          * xmit function from being called with a full queue.
 630          */
 631         if (unlikely(netif_queue_stopped(dev))) {
 632                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 633                 return NETDEV_TX_BUSY;
 634         }
 635
 636         if (likely(skb->dst && skb->dst->neighbour)) {
 637                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 638                         ipoib_path_lookup(skb, dev);
 639                         goto out;
 640                 }
 641
 642                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 643
 644                 if (likely(neigh->ah)) {
 645                         if (unlikely(memcmp(&neigh->dgid.raw,
 646                                             skb->dst->neighbour->ha + 4,
 647                                             sizeof(union ib_gid)))) {
 648                                 spin_lock(&priv->lock);
 649                                 /*
 650                                  * It's safe to call ipoib_put_ah() inside
 651                                  * priv->lock here, because we know that
 652                                  * path->ah will always hold one more reference,
 653                                  * so ipoib_put_ah() will never do more than
 654                                  * decrement the ref count.
 655                                  */
 656                                 ipoib_put_ah(neigh->ah);
 657                                 list_del(&neigh->list);
 658                                 ipoib_neigh_free(neigh);
 659                                 spin_unlock(&priv->lock);
 660                                 ipoib_path_lookup(skb, dev);
 661                                 goto out;
 662                         }
 663
 664                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 665                         goto out;
 666                 }
 667
 668                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 669                         spin_lock(&priv->lock);
 670                         __skb_queue_tail(&neigh->queue, skb);
 671                         spin_unlock(&priv->lock);
 672                 } else {
 673                         ++priv->stats.tx_dropped;
 674                         dev_kfree_skb_any(skb);
 675                 }
 676         } else {
 677                 struct ipoib_pseudoheader *phdr =
 678                         (struct ipoib_pseudoheader *) skb->data;
 679                 skb_pull(skb, sizeof *phdr);
 680
 681                 if (phdr->hwaddr[4] == 0xff) {
 682                         /* Add in the P_Key for multicast*/
 683                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 684                         phdr->hwaddr[9] = priv->pkey & 0xff;
 685
 686                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 687                 } else {
 688                         /* unicast GID -- should be ARP or RARP reply */
 689
 690                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 691                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 692                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 693                                            IPOIB_GID_FMT "\n",
 694                                            skb->dst ? "neigh" : "dst",
 695                                            be16_to_cpup((__be16 *) skb->data),
 696                                            IPOIB_QPN(phdr->hwaddr),
 697                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 698                                 dev_kfree_skb_any(skb);
 699                                 ++priv->stats.tx_dropped;
 700                                 goto out;
 701                         }
 702
 703                         unicast_arp_send(skb, dev, phdr);
 704                 }
 705         }
 706
 707 out:
 708         spin_unlock_irqrestore(&priv->tx_lock, flags);
 709
 710         return NETDEV_TX_OK;
 711 }
 712
 713 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
 714 {
 715         struct ipoib_dev_priv *priv = netdev_priv(dev);
 716
 717         return &priv->stats;
 718 }
 719
 720 static void ipoib_timeout(struct net_device *dev)
 721 {
 722         struct ipoib_dev_priv *priv = netdev_priv(dev);
 723
 724         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 725                    jiffies_to_msecs(jiffies - dev->trans_start));
 726         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 727                    netif_queue_stopped(dev),
 728                    priv->tx_head, priv->tx_tail);
 729         /* XXX reset QP, etc. */
 730 }
 731
 732 static int ipoib_hard_header(struct sk_buff *skb,
 733                              struct net_device *dev,
 734                              unsigned short type,
 735                              void *daddr, void *saddr, unsigned len)
 736 {
 737         struct ipoib_header *header;
 738
 739         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 740
 741         header->proto = htons(type);
 742         header->reserved = 0;
 743
 744         /*
 745          * If we don't have a neighbour structure, stuff the
 746          * destination address onto the front of the skb so we can
 747          * figure out where to send the packet later.
 748          */
 749         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 750                 struct ipoib_pseudoheader *phdr =
 751                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 752                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 753         }
 754
 755         return 0;
 756 }
 757
 758 static void ipoib_set_mcast_list(struct net_device *dev)
 759 {
 760         struct ipoib_dev_priv *priv = netdev_priv(dev);
 761
 762         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 763                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 764                 return;
 765         }
 766
 767         queue_work(ipoib_workqueue, &priv->restart_task);
 768 }
 769
 770 static void ipoib_neigh_destructor(struct neighbour *n)
 771 {
 772         struct ipoib_neigh *neigh;
 773         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 774         unsigned long flags;
 775         struct ipoib_ah *ah = NULL;
 776
 777         ipoib_dbg(priv,
 778                   "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
 779                   IPOIB_QPN(n->ha),
 780                   IPOIB_GID_RAW_ARG(n->ha + 4));
 781
 782         spin_lock_irqsave(&priv->lock, flags);
 783
 784         neigh = *to_ipoib_neigh(n);
 785         if (neigh) {
 786                 if (neigh->ah)
 787                         ah = neigh->ah;
 788                 list_del(&neigh->list);
 789                 ipoib_neigh_free(neigh);
 790         }
 791
 792         spin_unlock_irqrestore(&priv->lock, flags);
 793
 794         if (ah)
 795                 ipoib_put_ah(ah);
 796 }
 797
 798 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
 799 {
 800         struct ipoib_neigh *neigh;
 801
 802         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 803         if (!neigh)
 804                 return NULL;
 805
 806         neigh->neighbour = neighbour;
 807         *to_ipoib_neigh(neighbour) = neigh;
 808
 809         return neigh;
 810 }
 811
 812 void ipoib_neigh_free(struct ipoib_neigh *neigh)
 813 {
 814         *to_ipoib_neigh(neigh->neighbour) = NULL;
 815         kfree(neigh);
 816 }
 817
 818 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 819 {
 820         parms->neigh_destructor = ipoib_neigh_destructor;
 821
 822         return 0;
 823 }
 824
 825 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 826 {
 827         struct ipoib_dev_priv *priv = netdev_priv(dev);
 828
 829         /* Allocate RX/TX "rings" to hold queued skbs */
 830         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 831                                 GFP_KERNEL);
 832         if (!priv->rx_ring) {
 833                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 834                        ca->name, ipoib_recvq_size);
 835                 goto out;
 836         }
 837
 838         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
 839                                 GFP_KERNEL);
 840         if (!priv->tx_ring) {
 841                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 842                        ca->name, ipoib_sendq_size);
 843                 goto out_rx_ring_cleanup;
 844         }
 845
 846         /* priv->tx_head & tx_tail are already 0 */
 847
 848         if (ipoib_ib_dev_init(dev, ca, port))
 849                 goto out_tx_ring_cleanup;
 850
 851         return 0;
 852
 853 out_tx_ring_cleanup:
 854         kfree(priv->tx_ring);
 855
 856 out_rx_ring_cleanup:
 857         kfree(priv->rx_ring);
 858
 859 out:
 860         return -ENOMEM;
 861 }
 862
 863 void ipoib_dev_cleanup(struct net_device *dev)
 864 {
 865         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 866
 867         ipoib_delete_debug_files(dev);
 868
 869         /* Delete any child interfaces first */
 870         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 871                 unregister_netdev(cpriv->dev);
 872                 ipoib_dev_cleanup(cpriv->dev);
 873                 free_netdev(cpriv->dev);
 874         }
 875
 876         ipoib_ib_dev_cleanup(dev);
 877
 878         kfree(priv->rx_ring);
 879         kfree(priv->tx_ring);
 880
 881         priv->rx_ring = NULL;
 882         priv->tx_ring = NULL;
 883 }
 884
 885 static void ipoib_setup(struct net_device *dev)
 886 {
 887         struct ipoib_dev_priv *priv = netdev_priv(dev);
 888
 889         dev->open                = ipoib_open;
 890         dev->stop                = ipoib_stop;
 891         dev->change_mtu          = ipoib_change_mtu;
 892         dev->hard_start_xmit     = ipoib_start_xmit;
 893         dev->get_stats           = ipoib_get_stats;
 894         dev->tx_timeout          = ipoib_timeout;
 895         dev->hard_header         = ipoib_hard_header;
 896         dev->set_multicast_list  = ipoib_set_mcast_list;
 897         dev->neigh_setup         = ipoib_neigh_setup_dev;
 898
 899         dev->watchdog_timeo      = HZ;
 900
 901         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 902
 903         /*
 904          * We add in INFINIBAND_ALEN to allow for the destination
 905          * address "pseudoheader" for skbs without neighbour struct.
 906          */
 907         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 908         dev->addr_len            = INFINIBAND_ALEN;
 909         dev->type                = ARPHRD_INFINIBAND;
 910         dev->tx_queue_len        = ipoib_sendq_size * 2;
 911         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
 912
 913         /* MTU will be reset when mcast join happens */
 914         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 915         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 916
 917         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 918
 919         netif_carrier_off(dev);
 920
 921         SET_MODULE_OWNER(dev);
 922
 923         priv->dev = dev;
 924
 925         spin_lock_init(&priv->lock);
 926         spin_lock_init(&priv->tx_lock);
 927
 928         mutex_init(&priv->mcast_mutex);
 929         mutex_init(&priv->vlan_mutex);
 930
 931         INIT_LIST_HEAD(&priv->path_list);
 932         INIT_LIST_HEAD(&priv->child_intfs);
 933         INIT_LIST_HEAD(&priv->dead_ahs);
 934         INIT_LIST_HEAD(&priv->multicast_list);
 935
 936         INIT_WORK(&priv->pkey_task,    ipoib_pkey_poll,          priv->dev);
 937         INIT_WORK(&priv->mcast_task,   ipoib_mcast_join_task,    priv->dev);
 938         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush,       priv->dev);
 939         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
 940         INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah,            priv->dev);
 941 }
 942
 943 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
 944 {
 945         struct net_device *dev;
 946
 947         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
 948                            ipoib_setup);
 949         if (!dev)
 950                 return NULL;
 951
 952         return netdev_priv(dev);
 953 }
 954
 955 static ssize_t show_pkey(struct class_device *cdev, char *buf)
 956 {
 957         struct ipoib_dev_priv *priv =
 958                 netdev_priv(container_of(cdev, struct net_device, class_dev));
 959
 960         return sprintf(buf, "0x%04x\n", priv->pkey);
 961 }
 962 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
 963
 964 static ssize_t create_child(struct class_device *cdev,
 965                             const char *buf, size_t count)
 966 {
 967         int pkey;
 968         int ret;
 969
 970         if (sscanf(buf, "%i", &pkey) != 1)
 971                 return -EINVAL;
 972
 973         if (pkey < 0 || pkey > 0xffff)
 974                 return -EINVAL;
 975
 976         /*
 977          * Set the full membership bit, so that we join the right
 978          * broadcast group, etc.
 979          */
 980         pkey |= 0x8000;
 981
 982         ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
 983                              pkey);
 984
 985         return ret ? ret : count;
 986 }
 987 static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
 988
 989 static ssize_t delete_child(struct class_device *cdev,
 990                             const char *buf, size_t count)
 991 {
 992         int pkey;
 993         int ret;
 994
 995         if (sscanf(buf, "%i", &pkey) != 1)
 996                 return -EINVAL;
 997
 998         if (pkey < 0 || pkey > 0xffff)
 999                 return -EINVAL;
1000
1001         ret = ipoib_vlan_delete(container_of(cdev, struct net_device, class_dev),
1002                                 pkey);
1003
1004         return ret ? ret : count;
1005
1006 }
1007 static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1008
1009 int ipoib_add_pkey_attr(struct net_device *dev)
1010 {
1011         return class_device_create_file(&dev->class_dev,
1012                                         &class_device_attr_pkey);
1013 }
1014
1015 static struct net_device *ipoib_add_port(const char *format,
1016                                          struct ib_device *hca, u8 port)
1017 {
1018         struct ipoib_dev_priv *priv;
1019         int result = -ENOMEM;
1020
1021         priv = ipoib_intf_alloc(format);
1022         if (!priv)
1023                 goto alloc_mem_failed;
1024
1025         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1026
1027         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1028         if (result) {
1029                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1030                        hca->name, port, result);
1031                 goto alloc_mem_failed;
1032         }
1033
1034         /*
1035          * Set the full membership bit, so that we join the right
1036          * broadcast group, etc.
1037          */
1038         priv->pkey |= 0x8000;
1039
1040         priv->dev->broadcast[8] = priv->pkey >> 8;
1041         priv->dev->broadcast[9] = priv->pkey & 0xff;
1042
1043         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1044         if (result) {
1045                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1046                        hca->name, port, result);
1047                 goto alloc_mem_failed;
1048         } else
1049                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1050
1051
1052         result = ipoib_dev_init(priv->dev, hca, port);
1053         if (result < 0) {
1054                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1055                        hca->name, port, result);
1056                 goto device_init_failed;
1057         }
1058
1059         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1060                               priv->ca, ipoib_event);
1061         result = ib_register_event_handler(&priv->event_handler);
1062         if (result < 0) {
1063                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1064                        "port %d (ret = %d)\n",
1065                        hca->name, port, result);
1066                 goto event_failed;
1067         }
1068
1069         result = register_netdev(priv->dev);
1070         if (result) {
1071                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1072                        hca->name, port, result);
1073                 goto register_failed;
1074         }
1075
1076         ipoib_create_debug_files(priv->dev);
1077
1078         if (ipoib_add_pkey_attr(priv->dev))
1079                 goto sysfs_failed;
1080         if (class_device_create_file(&priv->dev->class_dev,
1081                                      &class_device_attr_create_child))
1082                 goto sysfs_failed;
1083         if (class_device_create_file(&priv->dev->class_dev,
1084                                      &class_device_attr_delete_child))
1085                 goto sysfs_failed;
1086
1087         return priv->dev;
1088
1089 sysfs_failed:
1090         ipoib_delete_debug_files(priv->dev);
1091         unregister_netdev(priv->dev);
1092
1093 register_failed:
1094         ib_unregister_event_handler(&priv->event_handler);
1095         flush_scheduled_work();
1096
1097 event_failed:
1098         ipoib_dev_cleanup(priv->dev);
1099
1100 device_init_failed:
1101         free_netdev(priv->dev);
1102
1103 alloc_mem_failed:
1104         return ERR_PTR(result);
1105 }
1106
1107 static void ipoib_add_one(struct ib_device *device)
1108 {
1109         struct list_head *dev_list;
1110         struct net_device *dev;
1111         struct ipoib_dev_priv *priv;
1112         int s, e, p;
1113
1114         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1115                 return;
1116
1117         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1118         if (!dev_list)
1119                 return;
1120
1121         INIT_LIST_HEAD(dev_list);
1122
1123         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1124                 s = 0;
1125                 e = 0;
1126         } else {
1127                 s = 1;
1128                 e = device->phys_port_cnt;
1129         }
1130
1131         for (p = s; p <= e; ++p) {
1132                 dev = ipoib_add_port("ib%d", device, p);
1133                 if (!IS_ERR(dev)) {
1134                         priv = netdev_priv(dev);
1135                         list_add_tail(&priv->list, dev_list);
1136                 }
1137         }
1138
1139         ib_set_client_data(device, &ipoib_client, dev_list);
1140 }
1141
1142 static void ipoib_remove_one(struct ib_device *device)
1143 {
1144         struct ipoib_dev_priv *priv, *tmp;
1145         struct list_head *dev_list;
1146
1147         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1148                 return;
1149
1150         dev_list = ib_get_client_data(device, &ipoib_client);
1151
1152         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1153                 ib_unregister_event_handler(&priv->event_handler);
1154                 flush_scheduled_work();
1155
1156                 unregister_netdev(priv->dev);
1157                 ipoib_dev_cleanup(priv->dev);
1158                 free_netdev(priv->dev);
1159         }
1160
1161         kfree(dev_list);
1162 }
1163
1164 static int __init ipoib_init_module(void)
1165 {
1166         int ret;
1167
1168         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1169         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1170         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1171
1172         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1173         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1174         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1175
1176         ret = ipoib_register_debugfs();
1177         if (ret)
1178                 return ret;
1179
1180         /*
1181          * We create our own workqueue mainly because we want to be
1182          * able to flush it when devices are being removed.  We can't
1183          * use schedule_work()/flush_scheduled_work() because both
1184          * unregister_netdev() and linkwatch_event take the rtnl lock,
1185          * so flush_scheduled_work() can deadlock during device
1186          * removal.
1187          */
1188         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1189         if (!ipoib_workqueue) {
1190                 ret = -ENOMEM;
1191                 goto err_fs;
1192         }
1193
1194         ib_sa_register_client(&ipoib_sa_client);
1195
1196         ret = ib_register_client(&ipoib_client);
1197         if (ret)
1198                 goto err_sa;
1199
1200         return 0;
1201
1202 err_sa:
1203         ib_sa_unregister_client(&ipoib_sa_client);
1204         destroy_workqueue(ipoib_workqueue);
1205
1206 err_fs:
1207         ipoib_unregister_debugfs();
1208
1209         return ret;
1210 }
1211
1212 static void __exit ipoib_cleanup_module(void)
1213 {
1214         ib_unregister_client(&ipoib_client);
1215         ib_sa_unregister_client(&ipoib_sa_client);
1216         ipoib_unregister_debugfs();
1217         destroy_workqueue(ipoib_workqueue);
1218 }
1219
1220 module_init(ipoib_init_module);
1221 module_exit(ipoib_cleanup_module);