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