git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/ulp/ipoib/ipoib_main.c

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