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   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $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 MODULE_AUTHOR("Roland Dreier");
  53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  58
  59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  63
  64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  65 int ipoib_debug_level;
  66
  67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  69 #endif
  70
  71 struct ipoib_path_iter {
  72         struct net_device *dev;
  73         struct ipoib_path  path;
  74 };
  75
  76 static const u8 ipv4_bcast_addr[] = {
  77         0x00, 0xff, 0xff, 0xff,
  78         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  79         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  80 };
  81
  82 struct workqueue_struct *ipoib_workqueue;
  83
  84 struct ib_sa_client ipoib_sa_client;
  85
  86 static void ipoib_add_one(struct ib_device *device);
  87 static void ipoib_remove_one(struct ib_device *device);
  88
  89 static struct ib_client ipoib_client = {
  90         .name   = "ipoib",
  91         .add    = ipoib_add_one,
  92         .remove = ipoib_remove_one
  93 };
  94
  95 int ipoib_open(struct net_device *dev)
  96 {
  97         struct ipoib_dev_priv *priv = netdev_priv(dev);
  98
  99         ipoib_dbg(priv, "bringing up interface\n");
 100
 101         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 102
 103         if (ipoib_pkey_dev_delay_open(dev))
 104                 return 0;
 105
 106         if (ipoib_ib_dev_open(dev))
 107                 return -EINVAL;
 108
 109         if (ipoib_ib_dev_up(dev)) {
 110                 ipoib_ib_dev_stop(dev);
 111                 return -EINVAL;
 112         }
 113
 114         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 115                 struct ipoib_dev_priv *cpriv;
 116
 117                 /* Bring up any child interfaces too */
 118                 mutex_lock(&priv->vlan_mutex);
 119                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 120                         int flags;
 121
 122                         flags = cpriv->dev->flags;
 123                         if (flags & IFF_UP)
 124                                 continue;
 125
 126                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 127                 }
 128                 mutex_unlock(&priv->vlan_mutex);
 129         }
 130
 131         netif_start_queue(dev);
 132
 133         return 0;
 134 }
 135
 136 static int ipoib_stop(struct net_device *dev)
 137 {
 138         struct ipoib_dev_priv *priv = netdev_priv(dev);
 139
 140         ipoib_dbg(priv, "stopping interface\n");
 141
 142         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 143
 144         netif_stop_queue(dev);
 145
 146         clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
 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         /* dev->mtu > 2K ==> connected mode */
 182         if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
 183                 if (new_mtu > priv->mcast_mtu)
 184                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 185                                    priv->mcast_mtu);
 186                 dev->mtu = new_mtu;
 187                 return 0;
 188         }
 189
 190         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN) {
 191                 return -EINVAL;
 192         }
 193
 194         priv->admin_mtu = new_mtu;
 195
 196         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 197
 198         return 0;
 199 }
 200
 201 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 202 {
 203         struct ipoib_dev_priv *priv = netdev_priv(dev);
 204         struct rb_node *n = priv->path_tree.rb_node;
 205         struct ipoib_path *path;
 206         int ret;
 207
 208         while (n) {
 209                 path = rb_entry(n, struct ipoib_path, rb_node);
 210
 211                 ret = memcmp(gid, path->pathrec.dgid.raw,
 212                              sizeof (union ib_gid));
 213
 214                 if (ret < 0)
 215                         n = n->rb_left;
 216                 else if (ret > 0)
 217                         n = n->rb_right;
 218                 else
 219                         return path;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 226 {
 227         struct ipoib_dev_priv *priv = netdev_priv(dev);
 228         struct rb_node **n = &priv->path_tree.rb_node;
 229         struct rb_node *pn = NULL;
 230         struct ipoib_path *tpath;
 231         int ret;
 232
 233         while (*n) {
 234                 pn = *n;
 235                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 236
 237                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 238                              sizeof (union ib_gid));
 239                 if (ret < 0)
 240                         n = &pn->rb_left;
 241                 else if (ret > 0)
 242                         n = &pn->rb_right;
 243                 else
 244                         return -EEXIST;
 245         }
 246
 247         rb_link_node(&path->rb_node, pn, n);
 248         rb_insert_color(&path->rb_node, &priv->path_tree);
 249
 250         list_add_tail(&path->list, &priv->path_list);
 251
 252         return 0;
 253 }
 254
 255 static void path_free(struct net_device *dev, struct ipoib_path *path)
 256 {
 257         struct ipoib_dev_priv *priv = netdev_priv(dev);
 258         struct ipoib_neigh *neigh, *tn;
 259         struct sk_buff *skb;
 260         unsigned long flags;
 261
 262         while ((skb = __skb_dequeue(&path->queue)))
 263                 dev_kfree_skb_irq(skb);
 264
 265         spin_lock_irqsave(&priv->lock, flags);
 266
 267         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 268                 /*
 269                  * It's safe to call ipoib_put_ah() inside priv->lock
 270                  * here, because we know that path->ah will always
 271                  * hold one more reference, so ipoib_put_ah() will
 272                  * never do more than decrement the ref count.
 273                  */
 274                 if (neigh->ah)
 275                         ipoib_put_ah(neigh->ah);
 276
 277                 ipoib_neigh_free(dev, neigh);
 278         }
 279
 280         spin_unlock_irqrestore(&priv->lock, flags);
 281
 282         if (path->ah)
 283                 ipoib_put_ah(path->ah);
 284
 285         kfree(path);
 286 }
 287
 288 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 289
 290 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 291 {
 292         struct ipoib_path_iter *iter;
 293
 294         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 295         if (!iter)
 296                 return NULL;
 297
 298         iter->dev = dev;
 299         memset(iter->path.pathrec.dgid.raw, 0, 16);
 300
 301         if (ipoib_path_iter_next(iter)) {
 302                 kfree(iter);
 303                 return NULL;
 304         }
 305
 306         return iter;
 307 }
 308
 309 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 310 {
 311         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 312         struct rb_node *n;
 313         struct ipoib_path *path;
 314         int ret = 1;
 315
 316         spin_lock_irq(&priv->lock);
 317
 318         n = rb_first(&priv->path_tree);
 319
 320         while (n) {
 321                 path = rb_entry(n, struct ipoib_path, rb_node);
 322
 323                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 324                            sizeof (union ib_gid)) < 0) {
 325                         iter->path = *path;
 326                         ret = 0;
 327                         break;
 328                 }
 329
 330                 n = rb_next(n);
 331         }
 332
 333         spin_unlock_irq(&priv->lock);
 334
 335         return ret;
 336 }
 337
 338 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 339                           struct ipoib_path *path)
 340 {
 341         *path = iter->path;
 342 }
 343
 344 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 345
 346 void ipoib_flush_paths(struct net_device *dev)
 347 {
 348         struct ipoib_dev_priv *priv = netdev_priv(dev);
 349         struct ipoib_path *path, *tp;
 350         LIST_HEAD(remove_list);
 351
 352         spin_lock_irq(&priv->tx_lock);
 353         spin_lock(&priv->lock);
 354
 355         list_splice(&priv->path_list, &remove_list);
 356         INIT_LIST_HEAD(&priv->path_list);
 357
 358         list_for_each_entry(path, &remove_list, list)
 359                 rb_erase(&path->rb_node, &priv->path_tree);
 360
 361         list_for_each_entry_safe(path, tp, &remove_list, list) {
 362                 if (path->query)
 363                         ib_sa_cancel_query(path->query_id, path->query);
 364                 spin_unlock(&priv->lock);
 365                 spin_unlock_irq(&priv->tx_lock);
 366                 wait_for_completion(&path->done);
 367                 path_free(dev, path);
 368                 spin_lock_irq(&priv->tx_lock);
 369                 spin_lock(&priv->lock);
 370         }
 371         spin_unlock(&priv->lock);
 372         spin_unlock_irq(&priv->tx_lock);
 373 }
 374
 375 static void path_rec_completion(int status,
 376                                 struct ib_sa_path_rec *pathrec,
 377                                 void *path_ptr)
 378 {
 379         struct ipoib_path *path = path_ptr;
 380         struct net_device *dev = path->dev;
 381         struct ipoib_dev_priv *priv = netdev_priv(dev);
 382         struct ipoib_ah *ah = NULL;
 383         struct ipoib_neigh *neigh, *tn;
 384         struct sk_buff_head skqueue;
 385         struct sk_buff *skb;
 386         unsigned long flags;
 387
 388         if (!status)
 389                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 390                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 391         else
 392                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 393                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 394
 395         skb_queue_head_init(&skqueue);
 396
 397         if (!status) {
 398                 struct ib_ah_attr av;
 399
 400                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 401                         ah = ipoib_create_ah(dev, priv->pd, &av);
 402         }
 403
 404         spin_lock_irqsave(&priv->lock, flags);
 405
 406         path->ah = ah;
 407
 408         if (ah) {
 409                 path->pathrec = *pathrec;
 410
 411                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 412                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 413
 414                 while ((skb = __skb_dequeue(&path->queue)))
 415                         __skb_queue_tail(&skqueue, skb);
 416
 417                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 418                         kref_get(&path->ah->ref);
 419                         neigh->ah = path->ah;
 420                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 421                                sizeof(union ib_gid));
 422
 423                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 424                                 if (!ipoib_cm_get(neigh))
 425                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 426                                                                                path,
 427                                                                                neigh));
 428                                 if (!ipoib_cm_get(neigh)) {
 429                                         list_del(&neigh->list);
 430                                         if (neigh->ah)
 431                                                 ipoib_put_ah(neigh->ah);
 432                                         ipoib_neigh_free(dev, neigh);
 433                                         continue;
 434                                 }
 435                         }
 436
 437                         while ((skb = __skb_dequeue(&neigh->queue)))
 438                                 __skb_queue_tail(&skqueue, skb);
 439                 }
 440         }
 441
 442         path->query = NULL;
 443         complete(&path->done);
 444
 445         spin_unlock_irqrestore(&priv->lock, flags);
 446
 447         while ((skb = __skb_dequeue(&skqueue))) {
 448                 skb->dev = dev;
 449                 if (dev_queue_xmit(skb))
 450                         ipoib_warn(priv, "dev_queue_xmit failed "
 451                                    "to requeue packet\n");
 452         }
 453 }
 454
 455 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 456 {
 457         struct ipoib_dev_priv *priv = netdev_priv(dev);
 458         struct ipoib_path *path;
 459
 460         path = kzalloc(sizeof *path, GFP_ATOMIC);
 461         if (!path)
 462                 return NULL;
 463
 464         path->dev = dev;
 465
 466         skb_queue_head_init(&path->queue);
 467
 468         INIT_LIST_HEAD(&path->neigh_list);
 469
 470         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 471         path->pathrec.sgid      = priv->local_gid;
 472         path->pathrec.pkey      = cpu_to_be16(priv->pkey);
 473         path->pathrec.numb_path = 1;
 474
 475         return path;
 476 }
 477
 478 static int path_rec_start(struct net_device *dev,
 479                           struct ipoib_path *path)
 480 {
 481         struct ipoib_dev_priv *priv = netdev_priv(dev);
 482
 483         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 484                   IPOIB_GID_ARG(path->pathrec.dgid));
 485
 486         init_completion(&path->done);
 487
 488         path->query_id =
 489                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 490                                    &path->pathrec,
 491                                    IB_SA_PATH_REC_DGID          |
 492                                    IB_SA_PATH_REC_SGID          |
 493                                    IB_SA_PATH_REC_NUMB_PATH     |
 494                                    IB_SA_PATH_REC_PKEY,
 495                                    1000, GFP_ATOMIC,
 496                                    path_rec_completion,
 497                                    path, &path->query);
 498         if (path->query_id < 0) {
 499                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 500                 path->query = NULL;
 501                 return path->query_id;
 502         }
 503
 504         return 0;
 505 }
 506
 507 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 508 {
 509         struct ipoib_dev_priv *priv = netdev_priv(dev);
 510         struct ipoib_path *path;
 511         struct ipoib_neigh *neigh;
 512
 513         neigh = ipoib_neigh_alloc(skb->dst->neighbour);
 514         if (!neigh) {
 515                 ++priv->stats.tx_dropped;
 516                 dev_kfree_skb_any(skb);
 517                 return;
 518         }
 519
 520         /*
 521          * We can only be called from ipoib_start_xmit, so we're
 522          * inside tx_lock -- no need to save/restore flags.
 523          */
 524         spin_lock(&priv->lock);
 525
 526         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 527         if (!path) {
 528                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 529                 if (!path)
 530                         goto err_path;
 531
 532                 __path_add(dev, path);
 533         }
 534
 535         list_add_tail(&neigh->list, &path->neigh_list);
 536
 537         if (path->ah) {
 538                 kref_get(&path->ah->ref);
 539                 neigh->ah = path->ah;
 540                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 541                        sizeof(union ib_gid));
 542
 543                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 544                         if (!ipoib_cm_get(neigh))
 545                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 546                         if (!ipoib_cm_get(neigh)) {
 547                                 list_del(&neigh->list);
 548                                 if (neigh->ah)
 549                                         ipoib_put_ah(neigh->ah);
 550                                 ipoib_neigh_free(dev, neigh);
 551                                 goto err_drop;
 552                         }
 553                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 554                                 __skb_queue_tail(&neigh->queue, skb);
 555                         else {
 556                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 557                                            skb_queue_len(&neigh->queue));
 558                                 goto err_drop;
 559                         }
 560                 } else
 561                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 562         } else {
 563                 neigh->ah  = NULL;
 564
 565                 if (!path->query && path_rec_start(dev, path))
 566                         goto err_list;
 567
 568                 __skb_queue_tail(&neigh->queue, skb);
 569         }
 570
 571         spin_unlock(&priv->lock);
 572         return;
 573
 574 err_list:
 575         list_del(&neigh->list);
 576
 577 err_path:
 578         ipoib_neigh_free(dev, neigh);
 579 err_drop:
 580         ++priv->stats.tx_dropped;
 581         dev_kfree_skb_any(skb);
 582
 583         spin_unlock(&priv->lock);
 584 }
 585
 586 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 587 {
 588         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 589
 590         /* Look up path record for unicasts */
 591         if (skb->dst->neighbour->ha[4] != 0xff) {
 592                 neigh_add_path(skb, dev);
 593                 return;
 594         }
 595
 596         /* Add in the P_Key for multicasts */
 597         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 598         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 599         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 600 }
 601
 602 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 603                              struct ipoib_pseudoheader *phdr)
 604 {
 605         struct ipoib_dev_priv *priv = netdev_priv(dev);
 606         struct ipoib_path *path;
 607
 608         /*
 609          * We can only be called from ipoib_start_xmit, so we're
 610          * inside tx_lock -- no need to save/restore flags.
 611          */
 612         spin_lock(&priv->lock);
 613
 614         path = __path_find(dev, phdr->hwaddr + 4);
 615         if (!path) {
 616                 path = path_rec_create(dev, phdr->hwaddr + 4);
 617                 if (path) {
 618                         /* put pseudoheader back on for next time */
 619                         skb_push(skb, sizeof *phdr);
 620                         __skb_queue_tail(&path->queue, skb);
 621
 622                         if (path_rec_start(dev, path)) {
 623                                 spin_unlock(&priv->lock);
 624                                 path_free(dev, path);
 625                                 return;
 626                         } else
 627                                 __path_add(dev, path);
 628                 } else {
 629                         ++priv->stats.tx_dropped;
 630                         dev_kfree_skb_any(skb);
 631                 }
 632
 633                 spin_unlock(&priv->lock);
 634                 return;
 635         }
 636
 637         if (path->ah) {
 638                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 639                           be16_to_cpu(path->pathrec.dlid));
 640
 641                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 642         } else if ((path->query || !path_rec_start(dev, path)) &&
 643                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 644                 /* put pseudoheader back on for next time */
 645                 skb_push(skb, sizeof *phdr);
 646                 __skb_queue_tail(&path->queue, skb);
 647         } else {
 648                 ++priv->stats.tx_dropped;
 649                 dev_kfree_skb_any(skb);
 650         }
 651
 652         spin_unlock(&priv->lock);
 653 }
 654
 655 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 656 {
 657         struct ipoib_dev_priv *priv = netdev_priv(dev);
 658         struct ipoib_neigh *neigh;
 659         unsigned long flags;
 660
 661         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 662                 return NETDEV_TX_LOCKED;
 663
 664         /*
 665          * Check if our queue is stopped.  Since we have the LLTX bit
 666          * set, we can't rely on netif_stop_queue() preventing our
 667          * xmit function from being called with a full queue.
 668          */
 669         if (unlikely(netif_queue_stopped(dev))) {
 670                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 671                 return NETDEV_TX_BUSY;
 672         }
 673
 674         if (likely(skb->dst && skb->dst->neighbour)) {
 675                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 676                         ipoib_path_lookup(skb, dev);
 677                         goto out;
 678                 }
 679
 680                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 681
 682                 if (ipoib_cm_get(neigh)) {
 683                         if (ipoib_cm_up(neigh)) {
 684                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 685                                 goto out;
 686                         }
 687                 } else if (neigh->ah) {
 688                         if (unlikely(memcmp(&neigh->dgid.raw,
 689                                             skb->dst->neighbour->ha + 4,
 690                                             sizeof(union ib_gid)))) {
 691                                 spin_lock(&priv->lock);
 692                                 /*
 693                                  * It's safe to call ipoib_put_ah() inside
 694                                  * priv->lock here, because we know that
 695                                  * path->ah will always hold one more reference,
 696                                  * so ipoib_put_ah() will never do more than
 697                                  * decrement the ref count.
 698                                  */
 699                                 ipoib_put_ah(neigh->ah);
 700                                 list_del(&neigh->list);
 701                                 ipoib_neigh_free(dev, neigh);
 702                                 spin_unlock(&priv->lock);
 703                                 ipoib_path_lookup(skb, dev);
 704                                 goto out;
 705                         }
 706
 707                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 708                         goto out;
 709                 }
 710
 711                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 712                         spin_lock(&priv->lock);
 713                         __skb_queue_tail(&neigh->queue, skb);
 714                         spin_unlock(&priv->lock);
 715                 } else {
 716                         ++priv->stats.tx_dropped;
 717                         dev_kfree_skb_any(skb);
 718                 }
 719         } else {
 720                 struct ipoib_pseudoheader *phdr =
 721                         (struct ipoib_pseudoheader *) skb->data;
 722                 skb_pull(skb, sizeof *phdr);
 723
 724                 if (phdr->hwaddr[4] == 0xff) {
 725                         /* Add in the P_Key for multicast*/
 726                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 727                         phdr->hwaddr[9] = priv->pkey & 0xff;
 728
 729                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 730                 } else {
 731                         /* unicast GID -- should be ARP or RARP reply */
 732
 733                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 734                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 735                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 736                                            IPOIB_GID_FMT "\n",
 737                                            skb->dst ? "neigh" : "dst",
 738                                            be16_to_cpup((__be16 *) skb->data),
 739                                            IPOIB_QPN(phdr->hwaddr),
 740                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 741                                 dev_kfree_skb_any(skb);
 742                                 ++priv->stats.tx_dropped;
 743                                 goto out;
 744                         }
 745
 746                         unicast_arp_send(skb, dev, phdr);
 747                 }
 748         }
 749
 750 out:
 751         spin_unlock_irqrestore(&priv->tx_lock, flags);
 752
 753         return NETDEV_TX_OK;
 754 }
 755
 756 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
 757 {
 758         struct ipoib_dev_priv *priv = netdev_priv(dev);
 759
 760         return &priv->stats;
 761 }
 762
 763 static void ipoib_timeout(struct net_device *dev)
 764 {
 765         struct ipoib_dev_priv *priv = netdev_priv(dev);
 766
 767         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 768                    jiffies_to_msecs(jiffies - dev->trans_start));
 769         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 770                    netif_queue_stopped(dev),
 771                    priv->tx_head, priv->tx_tail);
 772         /* XXX reset QP, etc. */
 773 }
 774
 775 static int ipoib_hard_header(struct sk_buff *skb,
 776                              struct net_device *dev,
 777                              unsigned short type,
 778                              void *daddr, void *saddr, unsigned len)
 779 {
 780         struct ipoib_header *header;
 781
 782         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 783
 784         header->proto = htons(type);
 785         header->reserved = 0;
 786
 787         /*
 788          * If we don't have a neighbour structure, stuff the
 789          * destination address onto the front of the skb so we can
 790          * figure out where to send the packet later.
 791          */
 792         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 793                 struct ipoib_pseudoheader *phdr =
 794                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 795                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 796         }
 797
 798         return 0;
 799 }
 800
 801 static void ipoib_set_mcast_list(struct net_device *dev)
 802 {
 803         struct ipoib_dev_priv *priv = netdev_priv(dev);
 804
 805         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 806                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 807                 return;
 808         }
 809
 810         queue_work(ipoib_workqueue, &priv->restart_task);
 811 }
 812
 813 static void ipoib_neigh_cleanup(struct neighbour *n)
 814 {
 815         struct ipoib_neigh *neigh;
 816         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 817         unsigned long flags;
 818         struct ipoib_ah *ah = NULL;
 819
 820         ipoib_dbg(priv,
 821                   "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
 822                   IPOIB_QPN(n->ha),
 823                   IPOIB_GID_RAW_ARG(n->ha + 4));
 824
 825         spin_lock_irqsave(&priv->lock, flags);
 826
 827         neigh = *to_ipoib_neigh(n);
 828         if (neigh) {
 829                 if (neigh->ah)
 830                         ah = neigh->ah;
 831                 list_del(&neigh->list);
 832                 ipoib_neigh_free(n->dev, neigh);
 833         }
 834
 835         spin_unlock_irqrestore(&priv->lock, flags);
 836
 837         if (ah)
 838                 ipoib_put_ah(ah);
 839 }
 840
 841 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
 842 {
 843         struct ipoib_neigh *neigh;
 844
 845         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 846         if (!neigh)
 847                 return NULL;
 848
 849         neigh->neighbour = neighbour;
 850         *to_ipoib_neigh(neighbour) = neigh;
 851         skb_queue_head_init(&neigh->queue);
 852         ipoib_cm_set(neigh, NULL);
 853
 854         return neigh;
 855 }
 856
 857 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 858 {
 859         struct ipoib_dev_priv *priv = netdev_priv(dev);
 860         struct sk_buff *skb;
 861         *to_ipoib_neigh(neigh->neighbour) = NULL;
 862         while ((skb = __skb_dequeue(&neigh->queue))) {
 863                 ++priv->stats.tx_dropped;
 864                 dev_kfree_skb_any(skb);
 865         }
 866         if (ipoib_cm_get(neigh))
 867                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 868         kfree(neigh);
 869 }
 870
 871 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 872 {
 873         parms->neigh_cleanup = ipoib_neigh_cleanup;
 874
 875         return 0;
 876 }
 877
 878 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 879 {
 880         struct ipoib_dev_priv *priv = netdev_priv(dev);
 881
 882         /* Allocate RX/TX "rings" to hold queued skbs */
 883         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 884                                 GFP_KERNEL);
 885         if (!priv->rx_ring) {
 886                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 887                        ca->name, ipoib_recvq_size);
 888                 goto out;
 889         }
 890
 891         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
 892                                 GFP_KERNEL);
 893         if (!priv->tx_ring) {
 894                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 895                        ca->name, ipoib_sendq_size);
 896                 goto out_rx_ring_cleanup;
 897         }
 898
 899         /* priv->tx_head & tx_tail are already 0 */
 900
 901         if (ipoib_ib_dev_init(dev, ca, port))
 902                 goto out_tx_ring_cleanup;
 903
 904         return 0;
 905
 906 out_tx_ring_cleanup:
 907         kfree(priv->tx_ring);
 908
 909 out_rx_ring_cleanup:
 910         kfree(priv->rx_ring);
 911
 912 out:
 913         return -ENOMEM;
 914 }
 915
 916 void ipoib_dev_cleanup(struct net_device *dev)
 917 {
 918         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 919
 920         ipoib_delete_debug_files(dev);
 921
 922         /* Delete any child interfaces first */
 923         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 924                 unregister_netdev(cpriv->dev);
 925                 ipoib_dev_cleanup(cpriv->dev);
 926                 free_netdev(cpriv->dev);
 927         }
 928
 929         ipoib_ib_dev_cleanup(dev);
 930
 931         kfree(priv->rx_ring);
 932         kfree(priv->tx_ring);
 933
 934         priv->rx_ring = NULL;
 935         priv->tx_ring = NULL;
 936 }
 937
 938 static void ipoib_setup(struct net_device *dev)
 939 {
 940         struct ipoib_dev_priv *priv = netdev_priv(dev);
 941
 942         dev->open                = ipoib_open;
 943         dev->stop                = ipoib_stop;
 944         dev->change_mtu          = ipoib_change_mtu;
 945         dev->hard_start_xmit     = ipoib_start_xmit;
 946         dev->get_stats           = ipoib_get_stats;
 947         dev->tx_timeout          = ipoib_timeout;
 948         dev->hard_header         = ipoib_hard_header;
 949         dev->set_multicast_list  = ipoib_set_mcast_list;
 950         dev->neigh_setup         = ipoib_neigh_setup_dev;
 951
 952         dev->watchdog_timeo      = HZ;
 953
 954         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 955
 956         /*
 957          * We add in INFINIBAND_ALEN to allow for the destination
 958          * address "pseudoheader" for skbs without neighbour struct.
 959          */
 960         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 961         dev->addr_len            = INFINIBAND_ALEN;
 962         dev->type                = ARPHRD_INFINIBAND;
 963         dev->tx_queue_len        = ipoib_sendq_size * 2;
 964         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
 965
 966         /* MTU will be reset when mcast join happens */
 967         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 968         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 969
 970         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 971
 972         netif_carrier_off(dev);
 973
 974         SET_MODULE_OWNER(dev);
 975
 976         priv->dev = dev;
 977
 978         spin_lock_init(&priv->lock);
 979         spin_lock_init(&priv->tx_lock);
 980
 981         mutex_init(&priv->mcast_mutex);
 982         mutex_init(&priv->vlan_mutex);
 983
 984         INIT_LIST_HEAD(&priv->path_list);
 985         INIT_LIST_HEAD(&priv->child_intfs);
 986         INIT_LIST_HEAD(&priv->dead_ahs);
 987         INIT_LIST_HEAD(&priv->multicast_list);
 988
 989         INIT_DELAYED_WORK(&priv->pkey_task,    ipoib_pkey_poll);
 990         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 991         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
 992         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
 993         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
 994 }
 995
 996 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
 997 {
 998         struct net_device *dev;
 999
1000         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1001                            ipoib_setup);
1002         if (!dev)
1003                 return NULL;
1004
1005         return netdev_priv(dev);
1006 }
1007
1008 static ssize_t show_pkey(struct device *dev,
1009                          struct device_attribute *attr, char *buf)
1010 {
1011         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1012
1013         return sprintf(buf, "0x%04x\n", priv->pkey);
1014 }
1015 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1016
1017 static ssize_t create_child(struct device *dev,
1018                             struct device_attribute *attr,
1019                             const char *buf, size_t count)
1020 {
1021         int pkey;
1022         int ret;
1023
1024         if (sscanf(buf, "%i", &pkey) != 1)
1025                 return -EINVAL;
1026
1027         if (pkey < 0 || pkey > 0xffff)
1028                 return -EINVAL;
1029
1030         /*
1031          * Set the full membership bit, so that we join the right
1032          * broadcast group, etc.
1033          */
1034         pkey |= 0x8000;
1035
1036         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1037
1038         return ret ? ret : count;
1039 }
1040 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1041
1042 static ssize_t delete_child(struct device *dev,
1043                             struct device_attribute *attr,
1044                             const char *buf, size_t count)
1045 {
1046         int pkey;
1047         int ret;
1048
1049         if (sscanf(buf, "%i", &pkey) != 1)
1050                 return -EINVAL;
1051
1052         if (pkey < 0 || pkey > 0xffff)
1053                 return -EINVAL;
1054
1055         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1056
1057         return ret ? ret : count;
1058
1059 }
1060 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1061
1062 int ipoib_add_pkey_attr(struct net_device *dev)
1063 {
1064         return device_create_file(&dev->dev, &dev_attr_pkey);
1065 }
1066
1067 static struct net_device *ipoib_add_port(const char *format,
1068                                          struct ib_device *hca, u8 port)
1069 {
1070         struct ipoib_dev_priv *priv;
1071         int result = -ENOMEM;
1072
1073         priv = ipoib_intf_alloc(format);
1074         if (!priv)
1075                 goto alloc_mem_failed;
1076
1077         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1078
1079         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1080         if (result) {
1081                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1082                        hca->name, port, result);
1083                 goto alloc_mem_failed;
1084         }
1085
1086         /*
1087          * Set the full membership bit, so that we join the right
1088          * broadcast group, etc.
1089          */
1090         priv->pkey |= 0x8000;
1091
1092         priv->dev->broadcast[8] = priv->pkey >> 8;
1093         priv->dev->broadcast[9] = priv->pkey & 0xff;
1094
1095         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1096         if (result) {
1097                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1098                        hca->name, port, result);
1099                 goto alloc_mem_failed;
1100         } else
1101                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1102
1103
1104         result = ipoib_dev_init(priv->dev, hca, port);
1105         if (result < 0) {
1106                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1107                        hca->name, port, result);
1108                 goto device_init_failed;
1109         }
1110
1111         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1112                               priv->ca, ipoib_event);
1113         result = ib_register_event_handler(&priv->event_handler);
1114         if (result < 0) {
1115                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1116                        "port %d (ret = %d)\n",
1117                        hca->name, port, result);
1118                 goto event_failed;
1119         }
1120
1121         result = register_netdev(priv->dev);
1122         if (result) {
1123                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1124                        hca->name, port, result);
1125                 goto register_failed;
1126         }
1127
1128         ipoib_create_debug_files(priv->dev);
1129
1130         if (ipoib_cm_add_mode_attr(priv->dev))
1131                 goto sysfs_failed;
1132         if (ipoib_add_pkey_attr(priv->dev))
1133                 goto sysfs_failed;
1134         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1135                 goto sysfs_failed;
1136         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1137                 goto sysfs_failed;
1138
1139         return priv->dev;
1140
1141 sysfs_failed:
1142         ipoib_delete_debug_files(priv->dev);
1143         unregister_netdev(priv->dev);
1144
1145 register_failed:
1146         ib_unregister_event_handler(&priv->event_handler);
1147         flush_scheduled_work();
1148
1149 event_failed:
1150         ipoib_dev_cleanup(priv->dev);
1151
1152 device_init_failed:
1153         free_netdev(priv->dev);
1154
1155 alloc_mem_failed:
1156         return ERR_PTR(result);
1157 }
1158
1159 static void ipoib_add_one(struct ib_device *device)
1160 {
1161         struct list_head *dev_list;
1162         struct net_device *dev;
1163         struct ipoib_dev_priv *priv;
1164         int s, e, p;
1165
1166         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1167                 return;
1168
1169         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1170         if (!dev_list)
1171                 return;
1172
1173         INIT_LIST_HEAD(dev_list);
1174
1175         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1176                 s = 0;
1177                 e = 0;
1178         } else {
1179                 s = 1;
1180                 e = device->phys_port_cnt;
1181         }
1182
1183         for (p = s; p <= e; ++p) {
1184                 dev = ipoib_add_port("ib%d", device, p);
1185                 if (!IS_ERR(dev)) {
1186                         priv = netdev_priv(dev);
1187                         list_add_tail(&priv->list, dev_list);
1188                 }
1189         }
1190
1191         ib_set_client_data(device, &ipoib_client, dev_list);
1192 }
1193
1194 static void ipoib_remove_one(struct ib_device *device)
1195 {
1196         struct ipoib_dev_priv *priv, *tmp;
1197         struct list_head *dev_list;
1198
1199         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1200                 return;
1201
1202         dev_list = ib_get_client_data(device, &ipoib_client);
1203
1204         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1205                 ib_unregister_event_handler(&priv->event_handler);
1206                 flush_scheduled_work();
1207
1208                 unregister_netdev(priv->dev);
1209                 ipoib_dev_cleanup(priv->dev);
1210                 free_netdev(priv->dev);
1211         }
1212
1213         kfree(dev_list);
1214 }
1215
1216 static int __init ipoib_init_module(void)
1217 {
1218         int ret;
1219
1220         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1221         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1222         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1223
1224         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1225         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1226         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1227
1228         ret = ipoib_register_debugfs();
1229         if (ret)
1230                 return ret;
1231
1232         /*
1233          * We create our own workqueue mainly because we want to be
1234          * able to flush it when devices are being removed.  We can't
1235          * use schedule_work()/flush_scheduled_work() because both
1236          * unregister_netdev() and linkwatch_event take the rtnl lock,
1237          * so flush_scheduled_work() can deadlock during device
1238          * removal.
1239          */
1240         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1241         if (!ipoib_workqueue) {
1242                 ret = -ENOMEM;
1243                 goto err_fs;
1244         }
1245
1246         ib_sa_register_client(&ipoib_sa_client);
1247
1248         ret = ib_register_client(&ipoib_client);
1249         if (ret)
1250                 goto err_sa;
1251
1252         return 0;
1253
1254 err_sa:
1255         ib_sa_unregister_client(&ipoib_sa_client);
1256         destroy_workqueue(ipoib_workqueue);
1257
1258 err_fs:
1259         ipoib_unregister_debugfs();
1260
1261         return ret;
1262 }
1263
1264 static void __exit ipoib_cleanup_module(void)
1265 {
1266         ib_unregister_client(&ipoib_client);
1267         ib_sa_unregister_client(&ipoib_sa_client);
1268         ipoib_unregister_debugfs();
1269         destroy_workqueue(ipoib_workqueue);
1270 }
1271
1272 module_init(ipoib_init_module);
1273 module_exit(ipoib_cleanup_module);