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