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                                         ipoib_neigh_free(neigh);
 497                                         continue;
 498                                 }
 499                         }
 500
 501                         while ((skb = __skb_dequeue(&neigh->queue)))
 502                                 __skb_queue_tail(&skqueue, skb);
 503                 }
 504                 path->valid = 1;
 505         }
 506
 507         path->query = NULL;
 508         complete(&path->done);
 509
 510         spin_unlock_irqrestore(&priv->lock, flags);
 511
 512         if (IS_ERR_OR_NULL(ah))
 513                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 514
 515         if (old_ah)
 516                 ipoib_put_ah(old_ah);
 517
 518         while ((skb = __skb_dequeue(&skqueue))) {
 519                 skb->dev = dev;
 520                 if (dev_queue_xmit(skb))
 521                         ipoib_warn(priv, "dev_queue_xmit failed "
 522                                    "to requeue packet\n");
 523         }
 524 }
 525
 526 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 527 {
 528         struct ipoib_dev_priv *priv = netdev_priv(dev);
 529         struct ipoib_path *path;
 530
 531         if (!priv->broadcast)
 532                 return NULL;
 533
 534         path = kzalloc(sizeof *path, GFP_ATOMIC);
 535         if (!path)
 536                 return NULL;
 537
 538         path->dev = dev;
 539
 540         skb_queue_head_init(&path->queue);
 541
 542         INIT_LIST_HEAD(&path->neigh_list);
 543
 544         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 545         path->pathrec.sgid          = priv->local_gid;
 546         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 547         path->pathrec.numb_path     = 1;
 548         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 549
 550         return path;
 551 }
 552
 553 static int path_rec_start(struct net_device *dev,
 554                           struct ipoib_path *path)
 555 {
 556         struct ipoib_dev_priv *priv = netdev_priv(dev);
 557
 558         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 559                   path->pathrec.dgid.raw);
 560
 561         init_completion(&path->done);
 562
 563         path->query_id =
 564                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 565                                    &path->pathrec,
 566                                    IB_SA_PATH_REC_DGID          |
 567                                    IB_SA_PATH_REC_SGID          |
 568                                    IB_SA_PATH_REC_NUMB_PATH     |
 569                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 570                                    IB_SA_PATH_REC_PKEY,
 571                                    1000, GFP_ATOMIC,
 572                                    path_rec_completion,
 573                                    path, &path->query);
 574         if (path->query_id < 0) {
 575                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 576                 path->query = NULL;
 577                 complete(&path->done);
 578                 return path->query_id;
 579         }
 580
 581         return 0;
 582 }
 583
 584 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
 585                            struct net_device *dev)
 586 {
 587         struct ipoib_dev_priv *priv = netdev_priv(dev);
 588         struct ipoib_path *path;
 589         struct ipoib_neigh *neigh;
 590         unsigned long flags;
 591
 592         spin_lock_irqsave(&priv->lock, flags);
 593         neigh = ipoib_neigh_alloc(daddr, dev);
 594         if (!neigh) {
 595                 spin_unlock_irqrestore(&priv->lock, flags);
 596                 ++dev->stats.tx_dropped;
 597                 dev_kfree_skb_any(skb);
 598                 return;
 599         }
 600
 601         path = __path_find(dev, daddr + 4);
 602         if (!path) {
 603                 path = path_rec_create(dev, daddr + 4);
 604                 if (!path)
 605                         goto err_path;
 606
 607                 __path_add(dev, path);
 608         }
 609
 610         list_add_tail(&neigh->list, &path->neigh_list);
 611
 612         if (path->ah) {
 613                 kref_get(&path->ah->ref);
 614                 neigh->ah = path->ah;
 615
 616                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 617                         if (!ipoib_cm_get(neigh))
 618                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 619                         if (!ipoib_cm_get(neigh)) {
 620                                 ipoib_neigh_free(neigh);
 621                                 goto err_drop;
 622                         }
 623                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 624                                 __skb_queue_tail(&neigh->queue, skb);
 625                         else {
 626                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 627                                            skb_queue_len(&neigh->queue));
 628                                 goto err_drop;
 629                         }
 630                 } else {
 631                         spin_unlock_irqrestore(&priv->lock, flags);
 632                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
 633                         ipoib_neigh_put(neigh);
 634                         return;
 635                 }
 636         } else {
 637                 neigh->ah  = NULL;
 638
 639                 if (!path->query && path_rec_start(dev, path))
 640                         goto err_path;
 641
 642                 __skb_queue_tail(&neigh->queue, skb);
 643         }
 644
 645         spin_unlock_irqrestore(&priv->lock, flags);
 646         ipoib_neigh_put(neigh);
 647         return;
 648
 649 err_path:
 650         ipoib_neigh_free(neigh);
 651 err_drop:
 652         ++dev->stats.tx_dropped;
 653         dev_kfree_skb_any(skb);
 654
 655         spin_unlock_irqrestore(&priv->lock, flags);
 656         ipoib_neigh_put(neigh);
 657 }
 658
 659 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 660                              struct ipoib_cb *cb)
 661 {
 662         struct ipoib_dev_priv *priv = netdev_priv(dev);
 663         struct ipoib_path *path;
 664         unsigned long flags;
 665
 666         spin_lock_irqsave(&priv->lock, flags);
 667
 668         path = __path_find(dev, cb->hwaddr + 4);
 669         if (!path || !path->valid) {
 670                 int new_path = 0;
 671
 672                 if (!path) {
 673                         path = path_rec_create(dev, cb->hwaddr + 4);
 674                         new_path = 1;
 675                 }
 676                 if (path) {
 677                         __skb_queue_tail(&path->queue, skb);
 678
 679                         if (!path->query && path_rec_start(dev, path)) {
 680                                 spin_unlock_irqrestore(&priv->lock, flags);
 681                                 if (new_path)
 682                                         path_free(dev, path);
 683                                 return;
 684                         } else
 685                                 __path_add(dev, path);
 686                 } else {
 687                         ++dev->stats.tx_dropped;
 688                         dev_kfree_skb_any(skb);
 689                 }
 690
 691                 spin_unlock_irqrestore(&priv->lock, flags);
 692                 return;
 693         }
 694
 695         if (path->ah) {
 696                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 697                           be16_to_cpu(path->pathrec.dlid));
 698
 699                 spin_unlock_irqrestore(&priv->lock, flags);
 700                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
 701                 return;
 702         } else if ((path->query || !path_rec_start(dev, path)) &&
 703                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 704                 __skb_queue_tail(&path->queue, skb);
 705         } else {
 706                 ++dev->stats.tx_dropped;
 707                 dev_kfree_skb_any(skb);
 708         }
 709
 710         spin_unlock_irqrestore(&priv->lock, flags);
 711 }
 712
 713 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 714 {
 715         struct ipoib_dev_priv *priv = netdev_priv(dev);
 716         struct ipoib_neigh *neigh;
 717         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 718         struct ipoib_header *header;
 719         unsigned long flags;
 720
 721         header = (struct ipoib_header *) skb->data;
 722
 723         if (unlikely(cb->hwaddr[4] == 0xff)) {
 724                 /* multicast, arrange "if" according to probability */
 725                 if ((header->proto != htons(ETH_P_IP)) &&
 726                     (header->proto != htons(ETH_P_IPV6)) &&
 727                     (header->proto != htons(ETH_P_ARP)) &&
 728                     (header->proto != htons(ETH_P_RARP)) &&
 729                     (header->proto != htons(ETH_P_TIPC))) {
 730                         /* ethertype not supported by IPoIB */
 731                         ++dev->stats.tx_dropped;
 732                         dev_kfree_skb_any(skb);
 733                         return NETDEV_TX_OK;
 734                 }
 735                 /* Add in the P_Key for multicast*/
 736                 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 737                 cb->hwaddr[9] = priv->pkey & 0xff;
 738
 739                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
 740                 if (likely(neigh))
 741                         goto send_using_neigh;
 742                 ipoib_mcast_send(dev, cb->hwaddr, skb);
 743                 return NETDEV_TX_OK;
 744         }
 745
 746         /* unicast, arrange "switch" according to probability */
 747         switch (header->proto) {
 748         case htons(ETH_P_IP):
 749         case htons(ETH_P_IPV6):
 750         case htons(ETH_P_TIPC):
 751                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
 752                 if (unlikely(!neigh)) {
 753                         neigh_add_path(skb, cb->hwaddr, dev);
 754                         return NETDEV_TX_OK;
 755                 }
 756                 break;
 757         case htons(ETH_P_ARP):
 758         case htons(ETH_P_RARP):
 759                 /* for unicast ARP and RARP should always perform path find */
 760                 unicast_arp_send(skb, dev, cb);
 761                 return NETDEV_TX_OK;
 762         default:
 763                 /* ethertype not supported by IPoIB */
 764                 ++dev->stats.tx_dropped;
 765                 dev_kfree_skb_any(skb);
 766                 return NETDEV_TX_OK;
 767         }
 768
 769 send_using_neigh:
 770         /* note we now hold a ref to neigh */
 771         if (ipoib_cm_get(neigh)) {
 772                 if (ipoib_cm_up(neigh)) {
 773                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 774                         goto unref;
 775                 }
 776         } else if (neigh->ah) {
 777                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
 778                 goto unref;
 779         }
 780
 781         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 782                 spin_lock_irqsave(&priv->lock, flags);
 783                 __skb_queue_tail(&neigh->queue, skb);
 784                 spin_unlock_irqrestore(&priv->lock, flags);
 785         } else {
 786                 ++dev->stats.tx_dropped;
 787                 dev_kfree_skb_any(skb);
 788         }
 789
 790 unref:
 791         ipoib_neigh_put(neigh);
 792
 793         return NETDEV_TX_OK;
 794 }
 795
 796 static void ipoib_timeout(struct net_device *dev)
 797 {
 798         struct ipoib_dev_priv *priv = netdev_priv(dev);
 799
 800         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 801                    jiffies_to_msecs(jiffies - dev->trans_start));
 802         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 803                    netif_queue_stopped(dev),
 804                    priv->tx_head, priv->tx_tail);
 805         /* XXX reset QP, etc. */
 806 }
 807
 808 static int ipoib_hard_header(struct sk_buff *skb,
 809                              struct net_device *dev,
 810                              unsigned short type,
 811                              const void *daddr, const void *saddr, unsigned len)
 812 {
 813         struct ipoib_header *header;
 814         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 815
 816         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 817
 818         header->proto = htons(type);
 819         header->reserved = 0;
 820
 821         /*
 822          * we don't rely on dst_entry structure,  always stuff the
 823          * destination address into skb->cb so we can figure out where
 824          * to send the packet later.
 825          */
 826         memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
 827
 828         return sizeof *header;
 829 }
 830
 831 static void ipoib_set_mcast_list(struct net_device *dev)
 832 {
 833         struct ipoib_dev_priv *priv = netdev_priv(dev);
 834
 835         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 836                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 837                 return;
 838         }
 839
 840         queue_work(ipoib_workqueue, &priv->restart_task);
 841 }
 842
 843 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
 844 {
 845         /*
 846          * Use only the address parts that contributes to spreading
 847          * The subnet prefix is not used as one can not connect to
 848          * same remote port (GUID) using the same remote QPN via two
 849          * different subnets.
 850          */
 851          /* qpn octets[1:4) & port GUID octets[12:20) */
 852         u32 *d32 = (u32 *) daddr;
 853         u32 hv;
 854
 855         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
 856         return hv & htbl->mask;
 857 }
 858
 859 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
 860 {
 861         struct ipoib_dev_priv *priv = netdev_priv(dev);
 862         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 863         struct ipoib_neigh_hash *htbl;
 864         struct ipoib_neigh *neigh = NULL;
 865         u32 hash_val;
 866
 867         rcu_read_lock_bh();
 868
 869         htbl = rcu_dereference_bh(ntbl->htbl);
 870
 871         if (!htbl)
 872                 goto out_unlock;
 873
 874         hash_val = ipoib_addr_hash(htbl, daddr);
 875         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
 876              neigh != NULL;
 877              neigh = rcu_dereference_bh(neigh->hnext)) {
 878                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
 879                         /* found, take one ref on behalf of the caller */
 880                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
 881                                 /* deleted */
 882                                 neigh = NULL;
 883                                 goto out_unlock;
 884                         }
 885                         neigh->alive = jiffies;
 886                         goto out_unlock;
 887                 }
 888         }
 889
 890 out_unlock:
 891         rcu_read_unlock_bh();
 892         return neigh;
 893 }
 894
 895 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
 896 {
 897         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 898         struct ipoib_neigh_hash *htbl;
 899         unsigned long neigh_obsolete;
 900         unsigned long dt;
 901         unsigned long flags;
 902         int i;
 903
 904         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 905                 return;
 906
 907         spin_lock_irqsave(&priv->lock, flags);
 908
 909         htbl = rcu_dereference_protected(ntbl->htbl,
 910                                          lockdep_is_held(&priv->lock));
 911
 912         if (!htbl)
 913                 goto out_unlock;
 914
 915         /* neigh is obsolete if it was idle for two GC periods */
 916         dt = 2 * arp_tbl.gc_interval;
 917         neigh_obsolete = jiffies - dt;
 918         /* handle possible race condition */
 919         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 920                 goto out_unlock;
 921
 922         for (i = 0; i < htbl->size; i++) {
 923                 struct ipoib_neigh *neigh;
 924                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
 925
 926                 while ((neigh = rcu_dereference_protected(*np,
 927                                                           lockdep_is_held(&priv->lock))) != NULL) {
 928                         /* was the neigh idle for two GC periods */
 929                         if (time_after(neigh_obsolete, neigh->alive)) {
 930                                 rcu_assign_pointer(*np,
 931                                                    rcu_dereference_protected(neigh->hnext,
 932                                                                              lockdep_is_held(&priv->lock)));
 933                                 /* remove from path/mc list */
 934                                 list_del(&neigh->list);
 935                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
 936                         } else {
 937                                 np = &neigh->hnext;
 938                         }
 939
 940                 }
 941         }
 942
 943 out_unlock:
 944         spin_unlock_irqrestore(&priv->lock, flags);
 945 }
 946
 947 static void ipoib_reap_neigh(struct work_struct *work)
 948 {
 949         struct ipoib_dev_priv *priv =
 950                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
 951
 952         __ipoib_reap_neigh(priv);
 953
 954         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 955                 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
 956                                    arp_tbl.gc_interval);
 957 }
 958
 959
 960 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
 961                                       struct net_device *dev)
 962 {
 963         struct ipoib_neigh *neigh;
 964
 965         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
 966         if (!neigh)
 967                 return NULL;
 968
 969         neigh->dev = dev;
 970         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
 971         skb_queue_head_init(&neigh->queue);
 972         INIT_LIST_HEAD(&neigh->list);
 973         ipoib_cm_set(neigh, NULL);
 974         /* one ref on behalf of the caller */
 975         atomic_set(&neigh->refcnt, 1);
 976
 977         return neigh;
 978 }
 979
 980 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
 981                                       struct net_device *dev)
 982 {
 983         struct ipoib_dev_priv *priv = netdev_priv(dev);
 984         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 985         struct ipoib_neigh_hash *htbl;
 986         struct ipoib_neigh *neigh;
 987         u32 hash_val;
 988
 989         htbl = rcu_dereference_protected(ntbl->htbl,
 990                                          lockdep_is_held(&priv->lock));
 991         if (!htbl) {
 992                 neigh = NULL;
 993                 goto out_unlock;
 994         }
 995
 996         /* need to add a new neigh, but maybe some other thread succeeded?
 997          * recalc hash, maybe hash resize took place so we do a search
 998          */
 999         hash_val = ipoib_addr_hash(htbl, daddr);
1000         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1001                                                lockdep_is_held(&priv->lock));
1002              neigh != NULL;
1003              neigh = rcu_dereference_protected(neigh->hnext,
1004                                                lockdep_is_held(&priv->lock))) {
1005                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1006                         /* found, take one ref on behalf of the caller */
1007                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1008                                 /* deleted */
1009                                 neigh = NULL;
1010                                 break;
1011                         }
1012                         neigh->alive = jiffies;
1013                         goto out_unlock;
1014                 }
1015         }
1016
1017         neigh = ipoib_neigh_ctor(daddr, dev);
1018         if (!neigh)
1019                 goto out_unlock;
1020
1021         /* one ref on behalf of the hash table */
1022         atomic_inc(&neigh->refcnt);
1023         neigh->alive = jiffies;
1024         /* put in hash */
1025         rcu_assign_pointer(neigh->hnext,
1026                            rcu_dereference_protected(htbl->buckets[hash_val],
1027                                                      lockdep_is_held(&priv->lock)));
1028         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1029         atomic_inc(&ntbl->entries);
1030
1031 out_unlock:
1032
1033         return neigh;
1034 }
1035
1036 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1037 {
1038         /* neigh reference count was dropprd to zero */
1039         struct net_device *dev = neigh->dev;
1040         struct ipoib_dev_priv *priv = netdev_priv(dev);
1041         struct sk_buff *skb;
1042         if (neigh->ah)
1043                 ipoib_put_ah(neigh->ah);
1044         while ((skb = __skb_dequeue(&neigh->queue))) {
1045                 ++dev->stats.tx_dropped;
1046                 dev_kfree_skb_any(skb);
1047         }
1048         if (ipoib_cm_get(neigh))
1049                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1050         ipoib_dbg(netdev_priv(dev),
1051                   "neigh free for %06x %pI6\n",
1052                   IPOIB_QPN(neigh->daddr),
1053                   neigh->daddr + 4);
1054         kfree(neigh);
1055         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1056                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1057                         complete(&priv->ntbl.flushed);
1058         }
1059 }
1060
1061 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1062 {
1063         /* Called as a result of removal from hash table */
1064         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1065         /* note TX context may hold another ref */
1066         ipoib_neigh_put(neigh);
1067 }
1068
1069 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1070 {
1071         struct net_device *dev = neigh->dev;
1072         struct ipoib_dev_priv *priv = netdev_priv(dev);
1073         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1074         struct ipoib_neigh_hash *htbl;
1075         struct ipoib_neigh __rcu **np;
1076         struct ipoib_neigh *n;
1077         u32 hash_val;
1078
1079         htbl = rcu_dereference_protected(ntbl->htbl,
1080                                         lockdep_is_held(&priv->lock));
1081         if (!htbl)
1082                 return;
1083
1084         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1085         np = &htbl->buckets[hash_val];
1086         for (n = rcu_dereference_protected(*np,
1087                                             lockdep_is_held(&priv->lock));
1088              n != NULL;
1089              n = rcu_dereference_protected(*np,
1090                                         lockdep_is_held(&priv->lock))) {
1091                 if (n == neigh) {
1092                         /* found */
1093                         rcu_assign_pointer(*np,
1094                                            rcu_dereference_protected(neigh->hnext,
1095                                                                      lockdep_is_held(&priv->lock)));
1096                         /* remove from parent list */
1097                         list_del(&neigh->list);
1098                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1099                         return;
1100                 } else {
1101                         np = &n->hnext;
1102                 }
1103         }
1104 }
1105
1106 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1107 {
1108         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1109         struct ipoib_neigh_hash *htbl;
1110         struct ipoib_neigh **buckets;
1111         u32 size;
1112
1113         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1114         ntbl->htbl = NULL;
1115         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1116         if (!htbl)
1117                 return -ENOMEM;
1118         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1119         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1120         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1121         if (!buckets) {
1122                 kfree(htbl);
1123                 return -ENOMEM;
1124         }
1125         htbl->size = size;
1126         htbl->mask = (size - 1);
1127         htbl->buckets = buckets;
1128         ntbl->htbl = htbl;
1129         htbl->ntbl = ntbl;
1130         atomic_set(&ntbl->entries, 0);
1131
1132         /* start garbage collection */
1133         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1134         queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1135                            arp_tbl.gc_interval);
1136
1137         return 0;
1138 }
1139
1140 static void neigh_hash_free_rcu(struct rcu_head *head)
1141 {
1142         struct ipoib_neigh_hash *htbl = container_of(head,
1143                                                     struct ipoib_neigh_hash,
1144                                                     rcu);
1145         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1146         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1147
1148         kfree(buckets);
1149         kfree(htbl);
1150         complete(&ntbl->deleted);
1151 }
1152
1153 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1154 {
1155         struct ipoib_dev_priv *priv = netdev_priv(dev);
1156         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1157         struct ipoib_neigh_hash *htbl;
1158         unsigned long flags;
1159         int i;
1160
1161         /* remove all neigh connected to a given path or mcast */
1162         spin_lock_irqsave(&priv->lock, flags);
1163
1164         htbl = rcu_dereference_protected(ntbl->htbl,
1165                                          lockdep_is_held(&priv->lock));
1166
1167         if (!htbl)
1168                 goto out_unlock;
1169
1170         for (i = 0; i < htbl->size; i++) {
1171                 struct ipoib_neigh *neigh;
1172                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1173
1174                 while ((neigh = rcu_dereference_protected(*np,
1175                                                           lockdep_is_held(&priv->lock))) != NULL) {
1176                         /* delete neighs belong to this parent */
1177                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1178                                 rcu_assign_pointer(*np,
1179                                                    rcu_dereference_protected(neigh->hnext,
1180                                                                              lockdep_is_held(&priv->lock)));
1181                                 /* remove from parent list */
1182                                 list_del(&neigh->list);
1183                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1184                         } else {
1185                                 np = &neigh->hnext;
1186                         }
1187
1188                 }
1189         }
1190 out_unlock:
1191         spin_unlock_irqrestore(&priv->lock, flags);
1192 }
1193
1194 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1195 {
1196         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1197         struct ipoib_neigh_hash *htbl;
1198         unsigned long flags;
1199         int i, wait_flushed = 0;
1200
1201         init_completion(&priv->ntbl.flushed);
1202
1203         spin_lock_irqsave(&priv->lock, flags);
1204
1205         htbl = rcu_dereference_protected(ntbl->htbl,
1206                                         lockdep_is_held(&priv->lock));
1207         if (!htbl)
1208                 goto out_unlock;
1209
1210         wait_flushed = atomic_read(&priv->ntbl.entries);
1211         if (!wait_flushed)
1212                 goto free_htbl;
1213
1214         for (i = 0; i < htbl->size; i++) {
1215                 struct ipoib_neigh *neigh;
1216                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1217
1218                 while ((neigh = rcu_dereference_protected(*np,
1219                                        lockdep_is_held(&priv->lock))) != NULL) {
1220                         rcu_assign_pointer(*np,
1221                                            rcu_dereference_protected(neigh->hnext,
1222                                                                      lockdep_is_held(&priv->lock)));
1223                         /* remove from path/mc list */
1224                         list_del(&neigh->list);
1225                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1226                 }
1227         }
1228
1229 free_htbl:
1230         rcu_assign_pointer(ntbl->htbl, NULL);
1231         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1232
1233 out_unlock:
1234         spin_unlock_irqrestore(&priv->lock, flags);
1235         if (wait_flushed)
1236                 wait_for_completion(&priv->ntbl.flushed);
1237 }
1238
1239 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1240 {
1241         struct ipoib_dev_priv *priv = netdev_priv(dev);
1242         int stopped;
1243
1244         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1245         init_completion(&priv->ntbl.deleted);
1246         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1247
1248         /* Stop GC if called at init fail need to cancel work */
1249         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1250         if (!stopped)
1251                 cancel_delayed_work(&priv->neigh_reap_task);
1252
1253         ipoib_flush_neighs(priv);
1254
1255         wait_for_completion(&priv->ntbl.deleted);
1256 }
1257
1258
1259 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1260 {
1261         struct ipoib_dev_priv *priv = netdev_priv(dev);
1262
1263         if (ipoib_neigh_hash_init(priv) < 0)
1264                 goto out;
1265         /* Allocate RX/TX "rings" to hold queued skbs */
1266         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1267                                 GFP_KERNEL);
1268         if (!priv->rx_ring) {
1269                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1270                        ca->name, ipoib_recvq_size);
1271                 goto out_neigh_hash_cleanup;
1272         }
1273
1274         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1275         if (!priv->tx_ring) {
1276                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1277                        ca->name, ipoib_sendq_size);
1278                 goto out_rx_ring_cleanup;
1279         }
1280
1281         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1282
1283         if (ipoib_ib_dev_init(dev, ca, port))
1284                 goto out_tx_ring_cleanup;
1285
1286         return 0;
1287
1288 out_tx_ring_cleanup:
1289         vfree(priv->tx_ring);
1290
1291 out_rx_ring_cleanup:
1292         kfree(priv->rx_ring);
1293
1294 out_neigh_hash_cleanup:
1295         ipoib_neigh_hash_uninit(dev);
1296 out:
1297         return -ENOMEM;
1298 }
1299
1300 void ipoib_dev_cleanup(struct net_device *dev)
1301 {
1302         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1303         LIST_HEAD(head);
1304
1305         ASSERT_RTNL();
1306
1307         ipoib_delete_debug_files(dev);
1308
1309         /* Delete any child interfaces first */
1310         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1311                 /* Stop GC on child */
1312                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1313                 cancel_delayed_work(&cpriv->neigh_reap_task);
1314                 unregister_netdevice_queue(cpriv->dev, &head);
1315         }
1316         unregister_netdevice_many(&head);
1317
1318         ipoib_ib_dev_cleanup(dev);
1319
1320         kfree(priv->rx_ring);
1321         vfree(priv->tx_ring);
1322
1323         priv->rx_ring = NULL;
1324         priv->tx_ring = NULL;
1325
1326         ipoib_neigh_hash_uninit(dev);
1327 }
1328
1329 static const struct header_ops ipoib_header_ops = {
1330         .create = ipoib_hard_header,
1331 };
1332
1333 static const struct net_device_ops ipoib_netdev_ops = {
1334         .ndo_uninit              = ipoib_uninit,
1335         .ndo_open                = ipoib_open,
1336         .ndo_stop                = ipoib_stop,
1337         .ndo_change_mtu          = ipoib_change_mtu,
1338         .ndo_fix_features        = ipoib_fix_features,
1339         .ndo_start_xmit          = ipoib_start_xmit,
1340         .ndo_tx_timeout          = ipoib_timeout,
1341         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1342 };
1343
1344 void ipoib_setup(struct net_device *dev)
1345 {
1346         struct ipoib_dev_priv *priv = netdev_priv(dev);
1347
1348         dev->netdev_ops          = &ipoib_netdev_ops;
1349         dev->header_ops          = &ipoib_header_ops;
1350
1351         ipoib_set_ethtool_ops(dev);
1352
1353         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1354
1355         dev->watchdog_timeo      = HZ;
1356
1357         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1358
1359         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1360         dev->addr_len            = INFINIBAND_ALEN;
1361         dev->type                = ARPHRD_INFINIBAND;
1362         dev->tx_queue_len        = ipoib_sendq_size * 2;
1363         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1364                                     NETIF_F_HIGHDMA);
1365         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
1366
1367         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1368
1369         netif_carrier_off(dev);
1370
1371         priv->dev = dev;
1372
1373         spin_lock_init(&priv->lock);
1374
1375         mutex_init(&priv->vlan_mutex);
1376
1377         INIT_LIST_HEAD(&priv->path_list);
1378         INIT_LIST_HEAD(&priv->child_intfs);
1379         INIT_LIST_HEAD(&priv->dead_ahs);
1380         INIT_LIST_HEAD(&priv->multicast_list);
1381
1382         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1383         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1384         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1385         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1386         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1387         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1388         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1389         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1390         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1391 }
1392
1393 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1394 {
1395         struct net_device *dev;
1396
1397         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1398                            ipoib_setup);
1399         if (!dev)
1400                 return NULL;
1401
1402         return netdev_priv(dev);
1403 }
1404
1405 static ssize_t show_pkey(struct device *dev,
1406                          struct device_attribute *attr, char *buf)
1407 {
1408         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1409
1410         return sprintf(buf, "0x%04x\n", priv->pkey);
1411 }
1412 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1413
1414 static ssize_t show_umcast(struct device *dev,
1415                            struct device_attribute *attr, char *buf)
1416 {
1417         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1418
1419         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1420 }
1421
1422 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1423 {
1424         struct ipoib_dev_priv *priv = netdev_priv(ndev);
1425
1426         if (umcast_val > 0) {
1427                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1428                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1429                                 "by userspace\n");
1430         } else
1431                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1432 }
1433
1434 static ssize_t set_umcast(struct device *dev,
1435                           struct device_attribute *attr,
1436                           const char *buf, size_t count)
1437 {
1438         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1439
1440         ipoib_set_umcast(to_net_dev(dev), umcast_val);
1441
1442         return count;
1443 }
1444 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1445
1446 int ipoib_add_umcast_attr(struct net_device *dev)
1447 {
1448         return device_create_file(&dev->dev, &dev_attr_umcast);
1449 }
1450
1451 static ssize_t create_child(struct device *dev,
1452                             struct device_attribute *attr,
1453                             const char *buf, size_t count)
1454 {
1455         int pkey;
1456         int ret;
1457
1458         if (sscanf(buf, "%i", &pkey) != 1)
1459                 return -EINVAL;
1460
1461         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1462                 return -EINVAL;
1463
1464         /*
1465          * Set the full membership bit, so that we join the right
1466          * broadcast group, etc.
1467          */
1468         pkey |= 0x8000;
1469
1470         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1471
1472         return ret ? ret : count;
1473 }
1474 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1475
1476 static ssize_t delete_child(struct device *dev,
1477                             struct device_attribute *attr,
1478                             const char *buf, size_t count)
1479 {
1480         int pkey;
1481         int ret;
1482
1483         if (sscanf(buf, "%i", &pkey) != 1)
1484                 return -EINVAL;
1485
1486         if (pkey < 0 || pkey > 0xffff)
1487                 return -EINVAL;
1488
1489         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1490
1491         return ret ? ret : count;
1492
1493 }
1494 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1495
1496 int ipoib_add_pkey_attr(struct net_device *dev)
1497 {
1498         return device_create_file(&dev->dev, &dev_attr_pkey);
1499 }
1500
1501 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1502 {
1503         struct ib_device_attr *device_attr;
1504         int result = -ENOMEM;
1505
1506         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1507         if (!device_attr) {
1508                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1509                        hca->name, sizeof *device_attr);
1510                 return result;
1511         }
1512
1513         result = ib_query_device(hca, device_attr);
1514         if (result) {
1515                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1516                        hca->name, result);
1517                 kfree(device_attr);
1518                 return result;
1519         }
1520         priv->hca_caps = device_attr->device_cap_flags;
1521
1522         kfree(device_attr);
1523
1524         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1525                 priv->dev->hw_features = NETIF_F_SG |
1526                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1527
1528                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1529                         priv->dev->hw_features |= NETIF_F_TSO;
1530
1531                 priv->dev->features |= priv->dev->hw_features;
1532         }
1533
1534         return 0;
1535 }
1536
1537 static struct net_device *ipoib_add_port(const char *format,
1538                                          struct ib_device *hca, u8 port)
1539 {
1540         struct ipoib_dev_priv *priv;
1541         struct ib_port_attr attr;
1542         int result = -ENOMEM;
1543
1544         priv = ipoib_intf_alloc(format);
1545         if (!priv)
1546                 goto alloc_mem_failed;
1547
1548         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1549         priv->dev->dev_id = port - 1;
1550
1551         if (!ib_query_port(hca, port, &attr))
1552                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1553         else {
1554                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1555                        hca->name, port);
1556                 goto device_init_failed;
1557         }
1558
1559         /* MTU will be reset when mcast join happens */
1560         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1561         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1562
1563         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1564
1565         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1566         if (result) {
1567                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1568                        hca->name, port, result);
1569                 goto device_init_failed;
1570         }
1571
1572         if (ipoib_set_dev_features(priv, hca))
1573                 goto device_init_failed;
1574
1575         /*
1576          * Set the full membership bit, so that we join the right
1577          * broadcast group, etc.
1578          */
1579         priv->pkey |= 0x8000;
1580
1581         priv->dev->broadcast[8] = priv->pkey >> 8;
1582         priv->dev->broadcast[9] = priv->pkey & 0xff;
1583
1584         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1585         if (result) {
1586                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1587                        hca->name, port, result);
1588                 goto device_init_failed;
1589         } else
1590                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1591
1592         result = ipoib_dev_init(priv->dev, hca, port);
1593         if (result < 0) {
1594                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1595                        hca->name, port, result);
1596                 goto device_init_failed;
1597         }
1598
1599         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1600                               priv->ca, ipoib_event);
1601         result = ib_register_event_handler(&priv->event_handler);
1602         if (result < 0) {
1603                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1604                        "port %d (ret = %d)\n",
1605                        hca->name, port, result);
1606                 goto event_failed;
1607         }
1608
1609         result = register_netdev(priv->dev);
1610         if (result) {
1611                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1612                        hca->name, port, result);
1613                 goto register_failed;
1614         }
1615
1616         ipoib_create_debug_files(priv->dev);
1617
1618         if (ipoib_cm_add_mode_attr(priv->dev))
1619                 goto sysfs_failed;
1620         if (ipoib_add_pkey_attr(priv->dev))
1621                 goto sysfs_failed;
1622         if (ipoib_add_umcast_attr(priv->dev))
1623                 goto sysfs_failed;
1624         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1625                 goto sysfs_failed;
1626         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1627                 goto sysfs_failed;
1628
1629         return priv->dev;
1630
1631 sysfs_failed:
1632         ipoib_delete_debug_files(priv->dev);
1633         unregister_netdev(priv->dev);
1634
1635 register_failed:
1636         ib_unregister_event_handler(&priv->event_handler);
1637         /* Stop GC if started before flush */
1638         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1639         cancel_delayed_work(&priv->neigh_reap_task);
1640         flush_workqueue(ipoib_workqueue);
1641
1642 event_failed:
1643         ipoib_dev_cleanup(priv->dev);
1644
1645 device_init_failed:
1646         free_netdev(priv->dev);
1647
1648 alloc_mem_failed:
1649         return ERR_PTR(result);
1650 }
1651
1652 static void ipoib_add_one(struct ib_device *device)
1653 {
1654         struct list_head *dev_list;
1655         struct net_device *dev;
1656         struct ipoib_dev_priv *priv;
1657         int s, e, p;
1658
1659         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1660                 return;
1661
1662         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1663         if (!dev_list)
1664                 return;
1665
1666         INIT_LIST_HEAD(dev_list);
1667
1668         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1669                 s = 0;
1670                 e = 0;
1671         } else {
1672                 s = 1;
1673                 e = device->phys_port_cnt;
1674         }
1675
1676         for (p = s; p <= e; ++p) {
1677                 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1678                         continue;
1679                 dev = ipoib_add_port("ib%d", device, p);
1680                 if (!IS_ERR(dev)) {
1681                         priv = netdev_priv(dev);
1682                         list_add_tail(&priv->list, dev_list);
1683                 }
1684         }
1685
1686         ib_set_client_data(device, &ipoib_client, dev_list);
1687 }
1688
1689 static void ipoib_remove_one(struct ib_device *device)
1690 {
1691         struct ipoib_dev_priv *priv, *tmp;
1692         struct list_head *dev_list;
1693
1694         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1695                 return;
1696
1697         dev_list = ib_get_client_data(device, &ipoib_client);
1698         if (!dev_list)
1699                 return;
1700
1701         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1702                 ib_unregister_event_handler(&priv->event_handler);
1703
1704                 rtnl_lock();
1705                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1706                 rtnl_unlock();
1707
1708                 /* Stop GC */
1709                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1710                 cancel_delayed_work(&priv->neigh_reap_task);
1711                 flush_workqueue(ipoib_workqueue);
1712
1713                 unregister_netdev(priv->dev);
1714                 free_netdev(priv->dev);
1715         }
1716
1717         kfree(dev_list);
1718 }
1719
1720 static int __init ipoib_init_module(void)
1721 {
1722         int ret;
1723
1724         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1725         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1726         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1727
1728         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1729         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1730         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1731 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1732         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1733 #endif
1734
1735         /*
1736          * When copying small received packets, we only copy from the
1737          * linear data part of the SKB, so we rely on this condition.
1738          */
1739         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1740
1741         ret = ipoib_register_debugfs();
1742         if (ret)
1743                 return ret;
1744
1745         /*
1746          * We create our own workqueue mainly because we want to be
1747          * able to flush it when devices are being removed.  We can't
1748          * use schedule_work()/flush_scheduled_work() because both
1749          * unregister_netdev() and linkwatch_event take the rtnl lock,
1750          * so flush_scheduled_work() can deadlock during device
1751          * removal.
1752          */
1753         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1754         if (!ipoib_workqueue) {
1755                 ret = -ENOMEM;
1756                 goto err_fs;
1757         }
1758
1759         ib_sa_register_client(&ipoib_sa_client);
1760
1761         ret = ib_register_client(&ipoib_client);
1762         if (ret)
1763                 goto err_sa;
1764
1765         ret = ipoib_netlink_init();
1766         if (ret)
1767                 goto err_client;
1768
1769         return 0;
1770
1771 err_client:
1772         ib_unregister_client(&ipoib_client);
1773
1774 err_sa:
1775         ib_sa_unregister_client(&ipoib_sa_client);
1776         destroy_workqueue(ipoib_workqueue);
1777
1778 err_fs:
1779         ipoib_unregister_debugfs();
1780
1781         return ret;
1782 }
1783
1784 static void __exit ipoib_cleanup_module(void)
1785 {
1786         ipoib_netlink_fini();
1787         ib_unregister_client(&ipoib_client);
1788         ib_sa_unregister_client(&ipoib_sa_client);
1789         ipoib_unregister_debugfs();
1790         destroy_workqueue(ipoib_workqueue);
1791 }
1792
1793 module_init(ipoib_init_module);
1794 module_exit(ipoib_cleanup_module);