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
  35 #include "ipoib.h"
  36
  37 #include <linux/module.h>
  38
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/kernel.h>
  42 #include <linux/vmalloc.h>
  43
  44 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  45
  46 #include <linux/ip.h>
  47 #include <linux/in.h>
  48
  49 #include <linux/jhash.h>
  50 #include <net/arp.h>
  51
  52 #define DRV_VERSION "1.0.0"
  53
  54 const char ipoib_driver_version[] = DRV_VERSION;
  55
  56 MODULE_AUTHOR("Roland Dreier");
  57 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  58 MODULE_LICENSE("Dual BSD/GPL");
  59 MODULE_VERSION(DRV_VERSION);
  60
  61 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  62 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  63
  64 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  65 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  66 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  67 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  68
  69 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  70 int ipoib_debug_level;
  71
  72 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  73 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  74 #endif
  75
  76 struct ipoib_path_iter {
  77         struct net_device *dev;
  78         struct ipoib_path  path;
  79 };
  80
  81 static const u8 ipv4_bcast_addr[] = {
  82         0x00, 0xff, 0xff, 0xff,
  83         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  84         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  85 };
  86
  87 struct workqueue_struct *ipoib_workqueue;
  88
  89 struct ib_sa_client ipoib_sa_client;
  90
  91 static void ipoib_add_one(struct ib_device *device);
  92 static void ipoib_remove_one(struct ib_device *device);
  93 static void ipoib_neigh_reclaim(struct rcu_head *rp);
  94
  95 static struct ib_client ipoib_client = {
  96         .name   = "ipoib",
  97         .add    = ipoib_add_one,
  98         .remove = ipoib_remove_one
  99 };
 100
 101 int ipoib_open(struct net_device *dev)
 102 {
 103         struct ipoib_dev_priv *priv = netdev_priv(dev);
 104
 105         ipoib_dbg(priv, "bringing up interface\n");
 106
 107         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 108
 109         if (ipoib_pkey_dev_delay_open(dev))
 110                 return 0;
 111
 112         if (ipoib_ib_dev_open(dev))
 113                 goto err_disable;
 114
 115         if (ipoib_ib_dev_up(dev))
 116                 goto err_stop;
 117
 118         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 119                 struct ipoib_dev_priv *cpriv;
 120
 121                 /* Bring up any child interfaces too */
 122                 mutex_lock(&priv->vlan_mutex);
 123                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 124                         int flags;
 125
 126                         flags = cpriv->dev->flags;
 127                         if (flags & IFF_UP)
 128                                 continue;
 129
 130                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 131                 }
 132                 mutex_unlock(&priv->vlan_mutex);
 133         }
 134
 135         netif_start_queue(dev);
 136
 137         return 0;
 138
 139 err_stop:
 140         ipoib_ib_dev_stop(dev, 1);
 141
 142 err_disable:
 143         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 144
 145         return -EINVAL;
 146 }
 147
 148 static int ipoib_stop(struct net_device *dev)
 149 {
 150         struct ipoib_dev_priv *priv = netdev_priv(dev);
 151
 152         ipoib_dbg(priv, "stopping interface\n");
 153
 154         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 155
 156         netif_stop_queue(dev);
 157
 158         ipoib_ib_dev_down(dev, 1);
 159         ipoib_ib_dev_stop(dev, 0);
 160
 161         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 162                 struct ipoib_dev_priv *cpriv;
 163
 164                 /* Bring down any child interfaces too */
 165                 mutex_lock(&priv->vlan_mutex);
 166                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 167                         int flags;
 168
 169                         flags = cpriv->dev->flags;
 170                         if (!(flags & IFF_UP))
 171                                 continue;
 172
 173                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 174                 }
 175                 mutex_unlock(&priv->vlan_mutex);
 176         }
 177
 178         return 0;
 179 }
 180
 181 static void ipoib_uninit(struct net_device *dev)
 182 {
 183         ipoib_dev_cleanup(dev);
 184 }
 185
 186 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 187 {
 188         struct ipoib_dev_priv *priv = netdev_priv(dev);
 189
 190         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 191                 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
 192
 193         return features;
 194 }
 195
 196 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 197 {
 198         struct ipoib_dev_priv *priv = netdev_priv(dev);
 199
 200         /* dev->mtu > 2K ==> connected mode */
 201         if (ipoib_cm_admin_enabled(dev)) {
 202                 if (new_mtu > ipoib_cm_max_mtu(dev))
 203                         return -EINVAL;
 204
 205                 if (new_mtu > priv->mcast_mtu)
 206                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 207                                    priv->mcast_mtu);
 208
 209                 dev->mtu = new_mtu;
 210                 return 0;
 211         }
 212
 213         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 214                 return -EINVAL;
 215
 216         priv->admin_mtu = new_mtu;
 217
 218         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 219
 220         return 0;
 221 }
 222
 223 int ipoib_set_mode(struct net_device *dev, const char *buf)
 224 {
 225         struct ipoib_dev_priv *priv = netdev_priv(dev);
 226
 227         /* flush paths if we switch modes so that connections are restarted */
 228         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
 229                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 230                 ipoib_warn(priv, "enabling connected mode "
 231                            "will cause multicast packet drops\n");
 232                 netdev_update_features(dev);
 233                 rtnl_unlock();
 234                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 235
 236                 ipoib_flush_paths(dev);
 237                 rtnl_lock();
 238                 return 0;
 239         }
 240
 241         if (!strcmp(buf, "datagram\n")) {
 242                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 243                 netdev_update_features(dev);
 244                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 245                 rtnl_unlock();
 246                 ipoib_flush_paths(dev);
 247                 rtnl_lock();
 248                 return 0;
 249         }
 250
 251         return -EINVAL;
 252 }
 253
 254 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 255 {
 256         struct ipoib_dev_priv *priv = netdev_priv(dev);
 257         struct rb_node *n = priv->path_tree.rb_node;
 258         struct ipoib_path *path;
 259         int ret;
 260
 261         while (n) {
 262                 path = rb_entry(n, struct ipoib_path, rb_node);
 263
 264                 ret = memcmp(gid, path->pathrec.dgid.raw,
 265                              sizeof (union ib_gid));
 266
 267                 if (ret < 0)
 268                         n = n->rb_left;
 269                 else if (ret > 0)
 270                         n = n->rb_right;
 271                 else
 272                         return path;
 273         }
 274
 275         return NULL;
 276 }
 277
 278 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 279 {
 280         struct ipoib_dev_priv *priv = netdev_priv(dev);
 281         struct rb_node **n = &priv->path_tree.rb_node;
 282         struct rb_node *pn = NULL;
 283         struct ipoib_path *tpath;
 284         int ret;
 285
 286         while (*n) {
 287                 pn = *n;
 288                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 289
 290                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 291                              sizeof (union ib_gid));
 292                 if (ret < 0)
 293                         n = &pn->rb_left;
 294                 else if (ret > 0)
 295                         n = &pn->rb_right;
 296                 else
 297                         return -EEXIST;
 298         }
 299
 300         rb_link_node(&path->rb_node, pn, n);
 301         rb_insert_color(&path->rb_node, &priv->path_tree);
 302
 303         list_add_tail(&path->list, &priv->path_list);
 304
 305         return 0;
 306 }
 307
 308 static void path_free(struct net_device *dev, struct ipoib_path *path)
 309 {
 310         struct sk_buff *skb;
 311
 312         while ((skb = __skb_dequeue(&path->queue)))
 313                 dev_kfree_skb_irq(skb);
 314
 315         ipoib_dbg(netdev_priv(dev), "path_free\n");
 316
 317         /* remove all neigh connected to this path */
 318         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 319
 320         if (path->ah)
 321                 ipoib_put_ah(path->ah);
 322
 323         kfree(path);
 324 }
 325
 326 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 327
 328 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 329 {
 330         struct ipoib_path_iter *iter;
 331
 332         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 333         if (!iter)
 334                 return NULL;
 335
 336         iter->dev = dev;
 337         memset(iter->path.pathrec.dgid.raw, 0, 16);
 338
 339         if (ipoib_path_iter_next(iter)) {
 340                 kfree(iter);
 341                 return NULL;
 342         }
 343
 344         return iter;
 345 }
 346
 347 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 348 {
 349         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 350         struct rb_node *n;
 351         struct ipoib_path *path;
 352         int ret = 1;
 353
 354         spin_lock_irq(&priv->lock);
 355
 356         n = rb_first(&priv->path_tree);
 357
 358         while (n) {
 359                 path = rb_entry(n, struct ipoib_path, rb_node);
 360
 361                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 362                            sizeof (union ib_gid)) < 0) {
 363                         iter->path = *path;
 364                         ret = 0;
 365                         break;
 366                 }
 367
 368                 n = rb_next(n);
 369         }
 370
 371         spin_unlock_irq(&priv->lock);
 372
 373         return ret;
 374 }
 375
 376 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 377                           struct ipoib_path *path)
 378 {
 379         *path = iter->path;
 380 }
 381
 382 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 383
 384 void ipoib_mark_paths_invalid(struct net_device *dev)
 385 {
 386         struct ipoib_dev_priv *priv = netdev_priv(dev);
 387         struct ipoib_path *path, *tp;
 388
 389         spin_lock_irq(&priv->lock);
 390
 391         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 392                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
 393                         be16_to_cpu(path->pathrec.dlid),
 394                         path->pathrec.dgid.raw);
 395                 path->valid =  0;
 396         }
 397
 398         spin_unlock_irq(&priv->lock);
 399 }
 400
 401 void ipoib_flush_paths(struct net_device *dev)
 402 {
 403         struct ipoib_dev_priv *priv = netdev_priv(dev);
 404         struct ipoib_path *path, *tp;
 405         LIST_HEAD(remove_list);
 406         unsigned long flags;
 407
 408         netif_tx_lock_bh(dev);
 409         spin_lock_irqsave(&priv->lock, flags);
 410
 411         list_splice_init(&priv->path_list, &remove_list);
 412
 413         list_for_each_entry(path, &remove_list, list)
 414                 rb_erase(&path->rb_node, &priv->path_tree);
 415
 416         list_for_each_entry_safe(path, tp, &remove_list, list) {
 417                 if (path->query)
 418                         ib_sa_cancel_query(path->query_id, path->query);
 419                 spin_unlock_irqrestore(&priv->lock, flags);
 420                 netif_tx_unlock_bh(dev);
 421                 wait_for_completion(&path->done);
 422                 path_free(dev, path);
 423                 netif_tx_lock_bh(dev);
 424                 spin_lock_irqsave(&priv->lock, flags);
 425         }
 426
 427         spin_unlock_irqrestore(&priv->lock, flags);
 428         netif_tx_unlock_bh(dev);
 429 }
 430
 431 static void path_rec_completion(int status,
 432                                 struct ib_sa_path_rec *pathrec,
 433                                 void *path_ptr)
 434 {
 435         struct ipoib_path *path = path_ptr;
 436         struct net_device *dev = path->dev;
 437         struct ipoib_dev_priv *priv = netdev_priv(dev);
 438         struct ipoib_ah *ah = NULL;
 439         struct ipoib_ah *old_ah = NULL;
 440         struct ipoib_neigh *neigh, *tn;
 441         struct sk_buff_head skqueue;
 442         struct sk_buff *skb;
 443         unsigned long flags;
 444
 445         if (!status)
 446                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 447                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
 448         else
 449                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 450                           status, path->pathrec.dgid.raw);
 451
 452         skb_queue_head_init(&skqueue);
 453
 454         if (!status) {
 455                 struct ib_ah_attr av;
 456
 457                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 458                         ah = ipoib_create_ah(dev, priv->pd, &av);
 459         }
 460
 461         spin_lock_irqsave(&priv->lock, flags);
 462
 463         if (!IS_ERR_OR_NULL(ah)) {
 464                 path->pathrec = *pathrec;
 465
 466                 old_ah   = path->ah;
 467                 path->ah = ah;
 468
 469                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 470                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 471
 472                 while ((skb = __skb_dequeue(&path->queue)))
 473                         __skb_queue_tail(&skqueue, skb);
 474
 475                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 476                         if (neigh->ah) {
 477                                 WARN_ON(neigh->ah != old_ah);
 478                                 /*
 479                                  * Dropping the ah reference inside
 480                                  * priv->lock is safe here, because we
 481                                  * will hold one more reference from
 482                                  * the original value of path->ah (ie
 483                                  * old_ah).
 484                                  */
 485                                 ipoib_put_ah(neigh->ah);
 486                         }
 487                         kref_get(&path->ah->ref);
 488                         neigh->ah = path->ah;
 489
 490                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 491                                 if (!ipoib_cm_get(neigh))
 492                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 493                                                                                path,
 494                                                                                neigh));
 495                                 if (!ipoib_cm_get(neigh)) {
 496                                         list_del(&neigh->list);
 497                                         ipoib_neigh_free(neigh);
 498                                         continue;
 499                                 }
 500                         }
 501
 502                         while ((skb = __skb_dequeue(&neigh->queue)))
 503                                 __skb_queue_tail(&skqueue, skb);
 504                 }
 505                 path->valid = 1;
 506         }
 507
 508         path->query = NULL;
 509         complete(&path->done);
 510
 511         spin_unlock_irqrestore(&priv->lock, flags);
 512
 513         if (IS_ERR_OR_NULL(ah))
 514                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 515
 516         if (old_ah)
 517                 ipoib_put_ah(old_ah);
 518
 519         while ((skb = __skb_dequeue(&skqueue))) {
 520                 skb->dev = dev;
 521                 if (dev_queue_xmit(skb))
 522                         ipoib_warn(priv, "dev_queue_xmit failed "
 523                                    "to requeue packet\n");
 524         }
 525 }
 526
 527 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 528 {
 529         struct ipoib_dev_priv *priv = netdev_priv(dev);
 530         struct ipoib_path *path;
 531
 532         if (!priv->broadcast)
 533                 return NULL;
 534
 535         path = kzalloc(sizeof *path, GFP_ATOMIC);
 536         if (!path)
 537                 return NULL;
 538
 539         path->dev = dev;
 540
 541         skb_queue_head_init(&path->queue);
 542
 543         INIT_LIST_HEAD(&path->neigh_list);
 544
 545         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 546         path->pathrec.sgid          = priv->local_gid;
 547         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 548         path->pathrec.numb_path     = 1;
 549         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 550
 551         return path;
 552 }
 553
 554 static int path_rec_start(struct net_device *dev,
 555                           struct ipoib_path *path)
 556 {
 557         struct ipoib_dev_priv *priv = netdev_priv(dev);
 558
 559         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 560                   path->pathrec.dgid.raw);
 561
 562         init_completion(&path->done);
 563
 564         path->query_id =
 565                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 566                                    &path->pathrec,
 567                                    IB_SA_PATH_REC_DGID          |
 568                                    IB_SA_PATH_REC_SGID          |
 569                                    IB_SA_PATH_REC_NUMB_PATH     |
 570                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 571                                    IB_SA_PATH_REC_PKEY,
 572                                    1000, GFP_ATOMIC,
 573                                    path_rec_completion,
 574                                    path, &path->query);
 575         if (path->query_id < 0) {
 576                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 577                 path->query = NULL;
 578                 complete(&path->done);
 579                 return path->query_id;
 580         }
 581
 582         return 0;
 583 }
 584
 585 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
 586                            struct net_device *dev)
 587 {
 588         struct ipoib_dev_priv *priv = netdev_priv(dev);
 589         struct ipoib_path *path;
 590         struct ipoib_neigh *neigh;
 591         unsigned long flags;
 592
 593         spin_lock_irqsave(&priv->lock, flags);
 594         neigh = ipoib_neigh_alloc(daddr, dev);
 595         if (!neigh) {
 596                 spin_unlock_irqrestore(&priv->lock, flags);
 597                 ++dev->stats.tx_dropped;
 598                 dev_kfree_skb_any(skb);
 599                 return;
 600         }
 601
 602         path = __path_find(dev, daddr + 4);
 603         if (!path) {
 604                 path = path_rec_create(dev, daddr + 4);
 605                 if (!path)
 606                         goto err_path;
 607
 608                 __path_add(dev, path);
 609         }
 610
 611         list_add_tail(&neigh->list, &path->neigh_list);
 612
 613         if (path->ah) {
 614                 kref_get(&path->ah->ref);
 615                 neigh->ah = path->ah;
 616
 617                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 618                         if (!ipoib_cm_get(neigh))
 619                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 620                         if (!ipoib_cm_get(neigh)) {
 621                                 list_del(&neigh->list);
 622                                 ipoib_neigh_free(neigh);
 623                                 goto err_drop;
 624                         }
 625                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 626                                 __skb_queue_tail(&neigh->queue, skb);
 627                         else {
 628                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 629                                            skb_queue_len(&neigh->queue));
 630                                 goto err_drop;
 631                         }
 632                 } else {
 633                         spin_unlock_irqrestore(&priv->lock, flags);
 634                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
 635                         ipoib_neigh_put(neigh);
 636                         return;
 637                 }
 638         } else {
 639                 neigh->ah  = NULL;
 640
 641                 if (!path->query && path_rec_start(dev, path))
 642                         goto err_list;
 643
 644                 __skb_queue_tail(&neigh->queue, skb);
 645         }
 646
 647         spin_unlock_irqrestore(&priv->lock, flags);
 648         ipoib_neigh_put(neigh);
 649         return;
 650
 651 err_list:
 652         list_del(&neigh->list);
 653
 654 err_path:
 655         ipoib_neigh_free(neigh);
 656 err_drop:
 657         ++dev->stats.tx_dropped;
 658         dev_kfree_skb_any(skb);
 659
 660         spin_unlock_irqrestore(&priv->lock, flags);
 661         ipoib_neigh_put(neigh);
 662 }
 663
 664 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 665                              struct ipoib_cb *cb)
 666 {
 667         struct ipoib_dev_priv *priv = netdev_priv(dev);
 668         struct ipoib_path *path;
 669         unsigned long flags;
 670
 671         spin_lock_irqsave(&priv->lock, flags);
 672
 673         path = __path_find(dev, cb->hwaddr + 4);
 674         if (!path || !path->valid) {
 675                 int new_path = 0;
 676
 677                 if (!path) {
 678                         path = path_rec_create(dev, cb->hwaddr + 4);
 679                         new_path = 1;
 680                 }
 681                 if (path) {
 682                         __skb_queue_tail(&path->queue, skb);
 683
 684                         if (!path->query && path_rec_start(dev, path)) {
 685                                 spin_unlock_irqrestore(&priv->lock, flags);
 686                                 if (new_path)
 687                                         path_free(dev, path);
 688                                 return;
 689                         } else
 690                                 __path_add(dev, path);
 691                 } else {
 692                         ++dev->stats.tx_dropped;
 693                         dev_kfree_skb_any(skb);
 694                 }
 695
 696                 spin_unlock_irqrestore(&priv->lock, flags);
 697                 return;
 698         }
 699
 700         if (path->ah) {
 701                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 702                           be16_to_cpu(path->pathrec.dlid));
 703
 704                 spin_unlock_irqrestore(&priv->lock, flags);
 705                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
 706                 return;
 707         } else if ((path->query || !path_rec_start(dev, path)) &&
 708                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 709                 __skb_queue_tail(&path->queue, skb);
 710         } else {
 711                 ++dev->stats.tx_dropped;
 712                 dev_kfree_skb_any(skb);
 713         }
 714
 715         spin_unlock_irqrestore(&priv->lock, flags);
 716 }
 717
 718 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 719 {
 720         struct ipoib_dev_priv *priv = netdev_priv(dev);
 721         struct ipoib_neigh *neigh;
 722         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 723         struct ipoib_header *header;
 724         unsigned long flags;
 725
 726         header = (struct ipoib_header *) skb->data;
 727
 728         if (unlikely(cb->hwaddr[4] == 0xff)) {
 729                 /* multicast, arrange "if" according to probability */
 730                 if ((header->proto != htons(ETH_P_IP)) &&
 731                     (header->proto != htons(ETH_P_IPV6)) &&
 732                     (header->proto != htons(ETH_P_ARP)) &&
 733                     (header->proto != htons(ETH_P_RARP)) &&
 734                     (header->proto != htons(ETH_P_TIPC))) {
 735                         /* ethertype not supported by IPoIB */
 736                         ++dev->stats.tx_dropped;
 737                         dev_kfree_skb_any(skb);
 738                         return NETDEV_TX_OK;
 739                 }
 740                 /* Add in the P_Key for multicast*/
 741                 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 742                 cb->hwaddr[9] = priv->pkey & 0xff;
 743
 744                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
 745                 if (likely(neigh))
 746                         goto send_using_neigh;
 747                 ipoib_mcast_send(dev, cb->hwaddr, skb);
 748                 return NETDEV_TX_OK;
 749         }
 750
 751         /* unicast, arrange "switch" according to probability */
 752         switch (header->proto) {
 753         case htons(ETH_P_IP):
 754         case htons(ETH_P_IPV6):
 755         case htons(ETH_P_TIPC):
 756                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
 757                 if (unlikely(!neigh)) {
 758                         neigh_add_path(skb, cb->hwaddr, dev);
 759                         return NETDEV_TX_OK;
 760                 }
 761                 break;
 762         case htons(ETH_P_ARP):
 763         case htons(ETH_P_RARP):
 764                 /* for unicast ARP and RARP should always perform path find */
 765                 unicast_arp_send(skb, dev, cb);
 766                 return NETDEV_TX_OK;
 767         default:
 768                 /* ethertype not supported by IPoIB */
 769                 ++dev->stats.tx_dropped;
 770                 dev_kfree_skb_any(skb);
 771                 return NETDEV_TX_OK;
 772         }
 773
 774 send_using_neigh:
 775         /* note we now hold a ref to neigh */
 776         if (ipoib_cm_get(neigh)) {
 777                 if (ipoib_cm_up(neigh)) {
 778                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 779                         goto unref;
 780                 }
 781         } else if (neigh->ah) {
 782                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
 783                 goto unref;
 784         }
 785
 786         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 787                 spin_lock_irqsave(&priv->lock, flags);
 788                 __skb_queue_tail(&neigh->queue, skb);
 789                 spin_unlock_irqrestore(&priv->lock, flags);
 790         } else {
 791                 ++dev->stats.tx_dropped;
 792                 dev_kfree_skb_any(skb);
 793         }
 794
 795 unref:
 796         ipoib_neigh_put(neigh);
 797
 798         return NETDEV_TX_OK;
 799 }
 800
 801 static void ipoib_timeout(struct net_device *dev)
 802 {
 803         struct ipoib_dev_priv *priv = netdev_priv(dev);
 804
 805         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 806                    jiffies_to_msecs(jiffies - dev->trans_start));
 807         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 808                    netif_queue_stopped(dev),
 809                    priv->tx_head, priv->tx_tail);
 810         /* XXX reset QP, etc. */
 811 }
 812
 813 static int ipoib_hard_header(struct sk_buff *skb,
 814                              struct net_device *dev,
 815                              unsigned short type,
 816                              const void *daddr, const void *saddr, unsigned len)
 817 {
 818         struct ipoib_header *header;
 819         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 820
 821         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 822
 823         header->proto = htons(type);
 824         header->reserved = 0;
 825
 826         /*
 827          * we don't rely on dst_entry structure,  always stuff the
 828          * destination address into skb->cb so we can figure out where
 829          * to send the packet later.
 830          */
 831         memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
 832
 833         return sizeof *header;
 834 }
 835
 836 static void ipoib_set_mcast_list(struct net_device *dev)
 837 {
 838         struct ipoib_dev_priv *priv = netdev_priv(dev);
 839
 840         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 841                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 842                 return;
 843         }
 844
 845         queue_work(ipoib_workqueue, &priv->restart_task);
 846 }
 847
 848 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
 849 {
 850         /*
 851          * Use only the address parts that contributes to spreading
 852          * The subnet prefix is not used as one can not connect to
 853          * same remote port (GUID) using the same remote QPN via two
 854          * different subnets.
 855          */
 856          /* qpn octets[1:4) & port GUID octets[12:20) */
 857         u32 *d32 = (u32 *) daddr;
 858         u32 hv;
 859
 860         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
 861         return hv & htbl->mask;
 862 }
 863
 864 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
 865 {
 866         struct ipoib_dev_priv *priv = netdev_priv(dev);
 867         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 868         struct ipoib_neigh_hash *htbl;
 869         struct ipoib_neigh *neigh = NULL;
 870         u32 hash_val;
 871
 872         rcu_read_lock_bh();
 873
 874         htbl = rcu_dereference_bh(ntbl->htbl);
 875
 876         if (!htbl)
 877                 goto out_unlock;
 878
 879         hash_val = ipoib_addr_hash(htbl, daddr);
 880         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
 881              neigh != NULL;
 882              neigh = rcu_dereference_bh(neigh->hnext)) {
 883                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
 884                         /* found, take one ref on behalf of the caller */
 885                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
 886                                 /* deleted */
 887                                 neigh = NULL;
 888                                 goto out_unlock;
 889                         }
 890                         neigh->alive = jiffies;
 891                         goto out_unlock;
 892                 }
 893         }
 894
 895 out_unlock:
 896         rcu_read_unlock_bh();
 897         return neigh;
 898 }
 899
 900 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
 901 {
 902         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 903         struct ipoib_neigh_hash *htbl;
 904         unsigned long neigh_obsolete;
 905         unsigned long dt;
 906         unsigned long flags;
 907         int i;
 908
 909         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 910                 return;
 911
 912         spin_lock_irqsave(&priv->lock, flags);
 913
 914         htbl = rcu_dereference_protected(ntbl->htbl,
 915                                          lockdep_is_held(&priv->lock));
 916
 917         if (!htbl)
 918                 goto out_unlock;
 919
 920         /* neigh is obsolete if it was idle for two GC periods */
 921         dt = 2 * arp_tbl.gc_interval;
 922         neigh_obsolete = jiffies - dt;
 923         /* handle possible race condition */
 924         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 925                 goto out_unlock;
 926
 927         for (i = 0; i < htbl->size; i++) {
 928                 struct ipoib_neigh *neigh;
 929                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
 930
 931                 while ((neigh = rcu_dereference_protected(*np,
 932                                                           lockdep_is_held(&priv->lock))) != NULL) {
 933                         /* was the neigh idle for two GC periods */
 934                         if (time_after(neigh_obsolete, neigh->alive)) {
 935                                 rcu_assign_pointer(*np,
 936                                                    rcu_dereference_protected(neigh->hnext,
 937                                                                              lockdep_is_held(&priv->lock)));
 938                                 /* remove from path/mc list */
 939                                 list_del(&neigh->list);
 940                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
 941                         } else {
 942                                 np = &neigh->hnext;
 943                         }
 944
 945                 }
 946         }
 947
 948 out_unlock:
 949         spin_unlock_irqrestore(&priv->lock, flags);
 950 }
 951
 952 static void ipoib_reap_neigh(struct work_struct *work)
 953 {
 954         struct ipoib_dev_priv *priv =
 955                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
 956
 957         __ipoib_reap_neigh(priv);
 958
 959         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 960                 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
 961                                    arp_tbl.gc_interval);
 962 }
 963
 964
 965 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
 966                                       struct net_device *dev)
 967 {
 968         struct ipoib_neigh *neigh;
 969
 970         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
 971         if (!neigh)
 972                 return NULL;
 973
 974         neigh->dev = dev;
 975         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
 976         skb_queue_head_init(&neigh->queue);
 977         INIT_LIST_HEAD(&neigh->list);
 978         ipoib_cm_set(neigh, NULL);
 979         /* one ref on behalf of the caller */
 980         atomic_set(&neigh->refcnt, 1);
 981
 982         return neigh;
 983 }
 984
 985 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
 986                                       struct net_device *dev)
 987 {
 988         struct ipoib_dev_priv *priv = netdev_priv(dev);
 989         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 990         struct ipoib_neigh_hash *htbl;
 991         struct ipoib_neigh *neigh;
 992         u32 hash_val;
 993
 994         htbl = rcu_dereference_protected(ntbl->htbl,
 995                                          lockdep_is_held(&priv->lock));
 996         if (!htbl) {
 997                 neigh = NULL;
 998                 goto out_unlock;
 999         }
1000
1001         /* need to add a new neigh, but maybe some other thread succeeded?
1002          * recalc hash, maybe hash resize took place so we do a search
1003          */
1004         hash_val = ipoib_addr_hash(htbl, daddr);
1005         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1006                                                lockdep_is_held(&priv->lock));
1007              neigh != NULL;
1008              neigh = rcu_dereference_protected(neigh->hnext,
1009                                                lockdep_is_held(&priv->lock))) {
1010                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1011                         /* found, take one ref on behalf of the caller */
1012                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1013                                 /* deleted */
1014                                 neigh = NULL;
1015                                 break;
1016                         }
1017                         neigh->alive = jiffies;
1018                         goto out_unlock;
1019                 }
1020         }
1021
1022         neigh = ipoib_neigh_ctor(daddr, dev);
1023         if (!neigh)
1024                 goto out_unlock;
1025
1026         /* one ref on behalf of the hash table */
1027         atomic_inc(&neigh->refcnt);
1028         neigh->alive = jiffies;
1029         /* put in hash */
1030         rcu_assign_pointer(neigh->hnext,
1031                            rcu_dereference_protected(htbl->buckets[hash_val],
1032                                                      lockdep_is_held(&priv->lock)));
1033         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1034         atomic_inc(&ntbl->entries);
1035
1036 out_unlock:
1037
1038         return neigh;
1039 }
1040
1041 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1042 {
1043         /* neigh reference count was dropprd to zero */
1044         struct net_device *dev = neigh->dev;
1045         struct ipoib_dev_priv *priv = netdev_priv(dev);
1046         struct sk_buff *skb;
1047         if (neigh->ah)
1048                 ipoib_put_ah(neigh->ah);
1049         while ((skb = __skb_dequeue(&neigh->queue))) {
1050                 ++dev->stats.tx_dropped;
1051                 dev_kfree_skb_any(skb);
1052         }
1053         if (ipoib_cm_get(neigh))
1054                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1055         ipoib_dbg(netdev_priv(dev),
1056                   "neigh free for %06x %pI6\n",
1057                   IPOIB_QPN(neigh->daddr),
1058                   neigh->daddr + 4);
1059         kfree(neigh);
1060         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1061                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1062                         complete(&priv->ntbl.flushed);
1063         }
1064 }
1065
1066 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1067 {
1068         /* Called as a result of removal from hash table */
1069         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1070         /* note TX context may hold another ref */
1071         ipoib_neigh_put(neigh);
1072 }
1073
1074 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1075 {
1076         struct net_device *dev = neigh->dev;
1077         struct ipoib_dev_priv *priv = netdev_priv(dev);
1078         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1079         struct ipoib_neigh_hash *htbl;
1080         struct ipoib_neigh __rcu **np;
1081         struct ipoib_neigh *n;
1082         u32 hash_val;
1083
1084         htbl = rcu_dereference_protected(ntbl->htbl,
1085                                         lockdep_is_held(&priv->lock));
1086         if (!htbl)
1087                 return;
1088
1089         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1090         np = &htbl->buckets[hash_val];
1091         for (n = rcu_dereference_protected(*np,
1092                                             lockdep_is_held(&priv->lock));
1093              n != NULL;
1094              n = rcu_dereference_protected(*np,
1095                                         lockdep_is_held(&priv->lock))) {
1096                 if (n == neigh) {
1097                         /* found */
1098                         rcu_assign_pointer(*np,
1099                                            rcu_dereference_protected(neigh->hnext,
1100                                                                      lockdep_is_held(&priv->lock)));
1101                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1102                         return;
1103                 } else {
1104                         np = &n->hnext;
1105                 }
1106         }
1107 }
1108
1109 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1110 {
1111         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1112         struct ipoib_neigh_hash *htbl;
1113         struct ipoib_neigh **buckets;
1114         u32 size;
1115
1116         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1117         ntbl->htbl = NULL;
1118         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1119         if (!htbl)
1120                 return -ENOMEM;
1121         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1122         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1123         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1124         if (!buckets) {
1125                 kfree(htbl);
1126                 return -ENOMEM;
1127         }
1128         htbl->size = size;
1129         htbl->mask = (size - 1);
1130         htbl->buckets = buckets;
1131         ntbl->htbl = htbl;
1132         htbl->ntbl = ntbl;
1133         atomic_set(&ntbl->entries, 0);
1134
1135         /* start garbage collection */
1136         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1137         queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1138                            arp_tbl.gc_interval);
1139
1140         return 0;
1141 }
1142
1143 static void neigh_hash_free_rcu(struct rcu_head *head)
1144 {
1145         struct ipoib_neigh_hash *htbl = container_of(head,
1146                                                     struct ipoib_neigh_hash,
1147                                                     rcu);
1148         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1149         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1150
1151         kfree(buckets);
1152         kfree(htbl);
1153         complete(&ntbl->deleted);
1154 }
1155
1156 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1157 {
1158         struct ipoib_dev_priv *priv = netdev_priv(dev);
1159         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1160         struct ipoib_neigh_hash *htbl;
1161         unsigned long flags;
1162         int i;
1163
1164         /* remove all neigh connected to a given path or mcast */
1165         spin_lock_irqsave(&priv->lock, flags);
1166
1167         htbl = rcu_dereference_protected(ntbl->htbl,
1168                                          lockdep_is_held(&priv->lock));
1169
1170         if (!htbl)
1171                 goto out_unlock;
1172
1173         for (i = 0; i < htbl->size; i++) {
1174                 struct ipoib_neigh *neigh;
1175                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1176
1177                 while ((neigh = rcu_dereference_protected(*np,
1178                                                           lockdep_is_held(&priv->lock))) != NULL) {
1179                         /* delete neighs belong to this parent */
1180                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1181                                 rcu_assign_pointer(*np,
1182                                                    rcu_dereference_protected(neigh->hnext,
1183                                                                              lockdep_is_held(&priv->lock)));
1184                                 /* remove from parent list */
1185                                 list_del(&neigh->list);
1186                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1187                         } else {
1188                                 np = &neigh->hnext;
1189                         }
1190
1191                 }
1192         }
1193 out_unlock:
1194         spin_unlock_irqrestore(&priv->lock, flags);
1195 }
1196
1197 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1198 {
1199         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1200         struct ipoib_neigh_hash *htbl;
1201         unsigned long flags;
1202         int i, wait_flushed = 0;
1203
1204         init_completion(&priv->ntbl.flushed);
1205
1206         spin_lock_irqsave(&priv->lock, flags);
1207
1208         htbl = rcu_dereference_protected(ntbl->htbl,
1209                                         lockdep_is_held(&priv->lock));
1210         if (!htbl)
1211                 goto out_unlock;
1212
1213         wait_flushed = atomic_read(&priv->ntbl.entries);
1214         if (!wait_flushed)
1215                 goto free_htbl;
1216
1217         for (i = 0; i < htbl->size; i++) {
1218                 struct ipoib_neigh *neigh;
1219                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1220
1221                 while ((neigh = rcu_dereference_protected(*np,
1222                                        lockdep_is_held(&priv->lock))) != NULL) {
1223                         rcu_assign_pointer(*np,
1224                                            rcu_dereference_protected(neigh->hnext,
1225                                                                      lockdep_is_held(&priv->lock)));
1226                         /* remove from path/mc list */
1227                         list_del(&neigh->list);
1228                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1229                 }
1230         }
1231
1232 free_htbl:
1233         rcu_assign_pointer(ntbl->htbl, NULL);
1234         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1235
1236 out_unlock:
1237         spin_unlock_irqrestore(&priv->lock, flags);
1238         if (wait_flushed)
1239                 wait_for_completion(&priv->ntbl.flushed);
1240 }
1241
1242 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1243 {
1244         struct ipoib_dev_priv *priv = netdev_priv(dev);
1245         int stopped;
1246
1247         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1248         init_completion(&priv->ntbl.deleted);
1249         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1250
1251         /* Stop GC if called at init fail need to cancel work */
1252         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1253         if (!stopped)
1254                 cancel_delayed_work(&priv->neigh_reap_task);
1255
1256         ipoib_flush_neighs(priv);
1257
1258         wait_for_completion(&priv->ntbl.deleted);
1259 }
1260
1261
1262 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1263 {
1264         struct ipoib_dev_priv *priv = netdev_priv(dev);
1265
1266         if (ipoib_neigh_hash_init(priv) < 0)
1267                 goto out;
1268         /* Allocate RX/TX "rings" to hold queued skbs */
1269         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1270                                 GFP_KERNEL);
1271         if (!priv->rx_ring) {
1272                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1273                        ca->name, ipoib_recvq_size);
1274                 goto out_neigh_hash_cleanup;
1275         }
1276
1277         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1278         if (!priv->tx_ring) {
1279                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1280                        ca->name, ipoib_sendq_size);
1281                 goto out_rx_ring_cleanup;
1282         }
1283
1284         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1285
1286         if (ipoib_ib_dev_init(dev, ca, port))
1287                 goto out_tx_ring_cleanup;
1288
1289         return 0;
1290
1291 out_tx_ring_cleanup:
1292         vfree(priv->tx_ring);
1293
1294 out_rx_ring_cleanup:
1295         kfree(priv->rx_ring);
1296
1297 out_neigh_hash_cleanup:
1298         ipoib_neigh_hash_uninit(dev);
1299 out:
1300         return -ENOMEM;
1301 }
1302
1303 void ipoib_dev_cleanup(struct net_device *dev)
1304 {
1305         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1306         LIST_HEAD(head);
1307
1308         ASSERT_RTNL();
1309
1310         ipoib_delete_debug_files(dev);
1311
1312         /* Delete any child interfaces first */
1313         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1314                 /* Stop GC on child */
1315                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1316                 cancel_delayed_work(&cpriv->neigh_reap_task);
1317                 unregister_netdevice_queue(cpriv->dev, &head);
1318         }
1319         unregister_netdevice_many(&head);
1320
1321         ipoib_ib_dev_cleanup(dev);
1322
1323         kfree(priv->rx_ring);
1324         vfree(priv->tx_ring);
1325
1326         priv->rx_ring = NULL;
1327         priv->tx_ring = NULL;
1328
1329         ipoib_neigh_hash_uninit(dev);
1330 }
1331
1332 static const struct header_ops ipoib_header_ops = {
1333         .create = ipoib_hard_header,
1334 };
1335
1336 static const struct net_device_ops ipoib_netdev_ops = {
1337         .ndo_uninit              = ipoib_uninit,
1338         .ndo_open                = ipoib_open,
1339         .ndo_stop                = ipoib_stop,
1340         .ndo_change_mtu          = ipoib_change_mtu,
1341         .ndo_fix_features        = ipoib_fix_features,
1342         .ndo_start_xmit          = ipoib_start_xmit,
1343         .ndo_tx_timeout          = ipoib_timeout,
1344         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1345 };
1346
1347 void ipoib_setup(struct net_device *dev)
1348 {
1349         struct ipoib_dev_priv *priv = netdev_priv(dev);
1350
1351         dev->netdev_ops          = &ipoib_netdev_ops;
1352         dev->header_ops          = &ipoib_header_ops;
1353
1354         ipoib_set_ethtool_ops(dev);
1355
1356         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1357
1358         dev->watchdog_timeo      = HZ;
1359
1360         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1361
1362         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1363         dev->addr_len            = INFINIBAND_ALEN;
1364         dev->type                = ARPHRD_INFINIBAND;
1365         dev->tx_queue_len        = ipoib_sendq_size * 2;
1366         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1367                                     NETIF_F_HIGHDMA);
1368         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
1369
1370         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1371
1372         netif_carrier_off(dev);
1373
1374         priv->dev = dev;
1375
1376         spin_lock_init(&priv->lock);
1377
1378         mutex_init(&priv->vlan_mutex);
1379
1380         INIT_LIST_HEAD(&priv->path_list);
1381         INIT_LIST_HEAD(&priv->child_intfs);
1382         INIT_LIST_HEAD(&priv->dead_ahs);
1383         INIT_LIST_HEAD(&priv->multicast_list);
1384
1385         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1386         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1387         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1388         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1389         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1390         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1391         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1392         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1393         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1394 }
1395
1396 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1397 {
1398         struct net_device *dev;
1399
1400         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1401                            ipoib_setup);
1402         if (!dev)
1403                 return NULL;
1404
1405         return netdev_priv(dev);
1406 }
1407
1408 static ssize_t show_pkey(struct device *dev,
1409                          struct device_attribute *attr, char *buf)
1410 {
1411         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1412
1413         return sprintf(buf, "0x%04x\n", priv->pkey);
1414 }
1415 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1416
1417 static ssize_t show_umcast(struct device *dev,
1418                            struct device_attribute *attr, char *buf)
1419 {
1420         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1421
1422         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1423 }
1424
1425 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1426 {
1427         struct ipoib_dev_priv *priv = netdev_priv(ndev);
1428
1429         if (umcast_val > 0) {
1430                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1431                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1432                                 "by userspace\n");
1433         } else
1434                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1435 }
1436
1437 static ssize_t set_umcast(struct device *dev,
1438                           struct device_attribute *attr,
1439                           const char *buf, size_t count)
1440 {
1441         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1442
1443         ipoib_set_umcast(to_net_dev(dev), umcast_val);
1444
1445         return count;
1446 }
1447 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1448
1449 int ipoib_add_umcast_attr(struct net_device *dev)
1450 {
1451         return device_create_file(&dev->dev, &dev_attr_umcast);
1452 }
1453
1454 static ssize_t create_child(struct device *dev,
1455                             struct device_attribute *attr,
1456                             const char *buf, size_t count)
1457 {
1458         int pkey;
1459         int ret;
1460
1461         if (sscanf(buf, "%i", &pkey) != 1)
1462                 return -EINVAL;
1463
1464         if (pkey < 0 || pkey > 0xffff)
1465                 return -EINVAL;
1466
1467         /*
1468          * Set the full membership bit, so that we join the right
1469          * broadcast group, etc.
1470          */
1471         pkey |= 0x8000;
1472
1473         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1474
1475         return ret ? ret : count;
1476 }
1477 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1478
1479 static ssize_t delete_child(struct device *dev,
1480                             struct device_attribute *attr,
1481                             const char *buf, size_t count)
1482 {
1483         int pkey;
1484         int ret;
1485
1486         if (sscanf(buf, "%i", &pkey) != 1)
1487                 return -EINVAL;
1488
1489         if (pkey < 0 || pkey > 0xffff)
1490                 return -EINVAL;
1491
1492         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1493
1494         return ret ? ret : count;
1495
1496 }
1497 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1498
1499 int ipoib_add_pkey_attr(struct net_device *dev)
1500 {
1501         return device_create_file(&dev->dev, &dev_attr_pkey);
1502 }
1503
1504 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1505 {
1506         struct ib_device_attr *device_attr;
1507         int result = -ENOMEM;
1508
1509         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1510         if (!device_attr) {
1511                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1512                        hca->name, sizeof *device_attr);
1513                 return result;
1514         }
1515
1516         result = ib_query_device(hca, device_attr);
1517         if (result) {
1518                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1519                        hca->name, result);
1520                 kfree(device_attr);
1521                 return result;
1522         }
1523         priv->hca_caps = device_attr->device_cap_flags;
1524
1525         kfree(device_attr);
1526
1527         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1528                 priv->dev->hw_features = NETIF_F_SG |
1529                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1530
1531                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1532                         priv->dev->hw_features |= NETIF_F_TSO;
1533
1534                 priv->dev->features |= priv->dev->hw_features;
1535         }
1536
1537         return 0;
1538 }
1539
1540 static struct net_device *ipoib_add_port(const char *format,
1541                                          struct ib_device *hca, u8 port)
1542 {
1543         struct ipoib_dev_priv *priv;
1544         struct ib_port_attr attr;
1545         int result = -ENOMEM;
1546
1547         priv = ipoib_intf_alloc(format);
1548         if (!priv)
1549                 goto alloc_mem_failed;
1550
1551         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1552         priv->dev->dev_id = port - 1;
1553
1554         if (!ib_query_port(hca, port, &attr))
1555                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1556         else {
1557                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1558                        hca->name, port);
1559                 goto device_init_failed;
1560         }
1561
1562         /* MTU will be reset when mcast join happens */
1563         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1564         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1565
1566         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1567
1568         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1569         if (result) {
1570                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1571                        hca->name, port, result);
1572                 goto device_init_failed;
1573         }
1574
1575         if (ipoib_set_dev_features(priv, hca))
1576                 goto device_init_failed;
1577
1578         /*
1579          * Set the full membership bit, so that we join the right
1580          * broadcast group, etc.
1581          */
1582         priv->pkey |= 0x8000;
1583
1584         priv->dev->broadcast[8] = priv->pkey >> 8;
1585         priv->dev->broadcast[9] = priv->pkey & 0xff;
1586
1587         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1588         if (result) {
1589                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1590                        hca->name, port, result);
1591                 goto device_init_failed;
1592         } else
1593                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1594
1595         result = ipoib_dev_init(priv->dev, hca, port);
1596         if (result < 0) {
1597                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1598                        hca->name, port, result);
1599                 goto device_init_failed;
1600         }
1601
1602         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1603                               priv->ca, ipoib_event);
1604         result = ib_register_event_handler(&priv->event_handler);
1605         if (result < 0) {
1606                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1607                        "port %d (ret = %d)\n",
1608                        hca->name, port, result);
1609                 goto event_failed;
1610         }
1611
1612         result = register_netdev(priv->dev);
1613         if (result) {
1614                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1615                        hca->name, port, result);
1616                 goto register_failed;
1617         }
1618
1619         ipoib_create_debug_files(priv->dev);
1620
1621         if (ipoib_cm_add_mode_attr(priv->dev))
1622                 goto sysfs_failed;
1623         if (ipoib_add_pkey_attr(priv->dev))
1624                 goto sysfs_failed;
1625         if (ipoib_add_umcast_attr(priv->dev))
1626                 goto sysfs_failed;
1627         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1628                 goto sysfs_failed;
1629         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1630                 goto sysfs_failed;
1631
1632         return priv->dev;
1633
1634 sysfs_failed:
1635         ipoib_delete_debug_files(priv->dev);
1636         unregister_netdev(priv->dev);
1637
1638 register_failed:
1639         ib_unregister_event_handler(&priv->event_handler);
1640         /* Stop GC if started before flush */
1641         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1642         cancel_delayed_work(&priv->neigh_reap_task);
1643         flush_workqueue(ipoib_workqueue);
1644
1645 event_failed:
1646         ipoib_dev_cleanup(priv->dev);
1647
1648 device_init_failed:
1649         free_netdev(priv->dev);
1650
1651 alloc_mem_failed:
1652         return ERR_PTR(result);
1653 }
1654
1655 static void ipoib_add_one(struct ib_device *device)
1656 {
1657         struct list_head *dev_list;
1658         struct net_device *dev;
1659         struct ipoib_dev_priv *priv;
1660         int s, e, p;
1661
1662         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1663                 return;
1664
1665         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1666         if (!dev_list)
1667                 return;
1668
1669         INIT_LIST_HEAD(dev_list);
1670
1671         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1672                 s = 0;
1673                 e = 0;
1674         } else {
1675                 s = 1;
1676                 e = device->phys_port_cnt;
1677         }
1678
1679         for (p = s; p <= e; ++p) {
1680                 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1681                         continue;
1682                 dev = ipoib_add_port("ib%d", device, p);
1683                 if (!IS_ERR(dev)) {
1684                         priv = netdev_priv(dev);
1685                         list_add_tail(&priv->list, dev_list);
1686                 }
1687         }
1688
1689         ib_set_client_data(device, &ipoib_client, dev_list);
1690 }
1691
1692 static void ipoib_remove_one(struct ib_device *device)
1693 {
1694         struct ipoib_dev_priv *priv, *tmp;
1695         struct list_head *dev_list;
1696
1697         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1698                 return;
1699
1700         dev_list = ib_get_client_data(device, &ipoib_client);
1701         if (!dev_list)
1702                 return;
1703
1704         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1705                 ib_unregister_event_handler(&priv->event_handler);
1706
1707                 rtnl_lock();
1708                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1709                 rtnl_unlock();
1710
1711                 /* Stop GC */
1712                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1713                 cancel_delayed_work(&priv->neigh_reap_task);
1714                 flush_workqueue(ipoib_workqueue);
1715
1716                 unregister_netdev(priv->dev);
1717                 free_netdev(priv->dev);
1718         }
1719
1720         kfree(dev_list);
1721 }
1722
1723 static int __init ipoib_init_module(void)
1724 {
1725         int ret;
1726
1727         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1728         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1729         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1730
1731         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1732         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1733         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1734 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1735         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1736 #endif
1737
1738         /*
1739          * When copying small received packets, we only copy from the
1740          * linear data part of the SKB, so we rely on this condition.
1741          */
1742         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1743
1744         ret = ipoib_register_debugfs();
1745         if (ret)
1746                 return ret;
1747
1748         /*
1749          * We create our own workqueue mainly because we want to be
1750          * able to flush it when devices are being removed.  We can't
1751          * use schedule_work()/flush_scheduled_work() because both
1752          * unregister_netdev() and linkwatch_event take the rtnl lock,
1753          * so flush_scheduled_work() can deadlock during device
1754          * removal.
1755          */
1756         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1757         if (!ipoib_workqueue) {
1758                 ret = -ENOMEM;
1759                 goto err_fs;
1760         }
1761
1762         ib_sa_register_client(&ipoib_sa_client);
1763
1764         ret = ib_register_client(&ipoib_client);
1765         if (ret)
1766                 goto err_sa;
1767
1768         ret = ipoib_netlink_init();
1769         if (ret)
1770                 goto err_client;
1771
1772         return 0;
1773
1774 err_client:
1775         ib_unregister_client(&ipoib_client);
1776
1777 err_sa:
1778         ib_sa_unregister_client(&ipoib_sa_client);
1779         destroy_workqueue(ipoib_workqueue);
1780
1781 err_fs:
1782         ipoib_unregister_debugfs();
1783
1784         return ret;
1785 }
1786
1787 static void __exit ipoib_cleanup_module(void)
1788 {
1789         ipoib_netlink_fini();
1790         ib_unregister_client(&ipoib_client);
1791         ib_sa_unregister_client(&ipoib_sa_client);
1792         ipoib_unregister_debugfs();
1793         destroy_workqueue(ipoib_workqueue);
1794 }
1795
1796 module_init(ipoib_init_module);
1797 module_exit(ipoib_cleanup_module);