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 <net/dst.h>
  50
  51 MODULE_AUTHOR("Roland Dreier");
  52 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  53 MODULE_LICENSE("Dual BSD/GPL");
  54
  55 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  56 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  57
  58 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  59 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  60 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  61 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  62
  63 static int lro;
  64 module_param(lro, bool, 0444);
  65 MODULE_PARM_DESC(lro,  "Enable LRO (Large Receive Offload)");
  66
  67 static int lro_max_aggr = IPOIB_LRO_MAX_AGGR;
  68 module_param(lro_max_aggr, int, 0644);
  69 MODULE_PARM_DESC(lro_max_aggr, "LRO: Max packets to be aggregated "
  70                 "(default = 64)");
  71
  72 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  73 int ipoib_debug_level;
  74
  75 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  76 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  77 #endif
  78
  79 struct ipoib_path_iter {
  80         struct net_device *dev;
  81         struct ipoib_path  path;
  82 };
  83
  84 static const u8 ipv4_bcast_addr[] = {
  85         0x00, 0xff, 0xff, 0xff,
  86         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  87         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  88 };
  89
  90 struct workqueue_struct *ipoib_workqueue;
  91
  92 struct ib_sa_client ipoib_sa_client;
  93
  94 static void ipoib_add_one(struct ib_device *device);
  95 static void ipoib_remove_one(struct ib_device *device);
  96
  97 static struct ib_client ipoib_client = {
  98         .name   = "ipoib",
  99         .add    = ipoib_add_one,
 100         .remove = ipoib_remove_one
 101 };
 102
 103 int ipoib_open(struct net_device *dev)
 104 {
 105         struct ipoib_dev_priv *priv = netdev_priv(dev);
 106
 107         ipoib_dbg(priv, "bringing up interface\n");
 108
 109         if (!test_and_set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 110                 napi_enable(&priv->napi);
 111
 112         if (ipoib_pkey_dev_delay_open(dev))
 113                 return 0;
 114
 115         if (ipoib_ib_dev_open(dev))
 116                 goto err_disable;
 117
 118         if (ipoib_ib_dev_up(dev))
 119                 goto err_stop;
 120
 121         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 122                 struct ipoib_dev_priv *cpriv;
 123
 124                 /* Bring up any child interfaces too */
 125                 mutex_lock(&priv->vlan_mutex);
 126                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 127                         int flags;
 128
 129                         flags = cpriv->dev->flags;
 130                         if (flags & IFF_UP)
 131                                 continue;
 132
 133                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 134                 }
 135                 mutex_unlock(&priv->vlan_mutex);
 136         }
 137
 138         netif_start_queue(dev);
 139
 140         return 0;
 141
 142 err_stop:
 143         ipoib_ib_dev_stop(dev, 1);
 144
 145 err_disable:
 146         napi_disable(&priv->napi);
 147         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 148
 149         return -EINVAL;
 150 }
 151
 152 static int ipoib_stop(struct net_device *dev)
 153 {
 154         struct ipoib_dev_priv *priv = netdev_priv(dev);
 155
 156         ipoib_dbg(priv, "stopping interface\n");
 157
 158         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 159         napi_disable(&priv->napi);
 160
 161         netif_stop_queue(dev);
 162
 163         ipoib_ib_dev_down(dev, 0);
 164         ipoib_ib_dev_stop(dev, 0);
 165
 166         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 167                 struct ipoib_dev_priv *cpriv;
 168
 169                 /* Bring down any child interfaces too */
 170                 mutex_lock(&priv->vlan_mutex);
 171                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 172                         int flags;
 173
 174                         flags = cpriv->dev->flags;
 175                         if (!(flags & IFF_UP))
 176                                 continue;
 177
 178                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 179                 }
 180                 mutex_unlock(&priv->vlan_mutex);
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 187 {
 188         struct ipoib_dev_priv *priv = netdev_priv(dev);
 189
 190         /* dev->mtu > 2K ==> connected mode */
 191         if (ipoib_cm_admin_enabled(dev)) {
 192                 if (new_mtu > ipoib_cm_max_mtu(dev))
 193                         return -EINVAL;
 194
 195                 if (new_mtu > priv->mcast_mtu)
 196                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 197                                    priv->mcast_mtu);
 198
 199                 dev->mtu = new_mtu;
 200                 return 0;
 201         }
 202
 203         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 204                 return -EINVAL;
 205
 206         priv->admin_mtu = new_mtu;
 207
 208         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 209
 210         return 0;
 211 }
 212
 213 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 214 {
 215         struct ipoib_dev_priv *priv = netdev_priv(dev);
 216         struct rb_node *n = priv->path_tree.rb_node;
 217         struct ipoib_path *path;
 218         int ret;
 219
 220         while (n) {
 221                 path = rb_entry(n, struct ipoib_path, rb_node);
 222
 223                 ret = memcmp(gid, path->pathrec.dgid.raw,
 224                              sizeof (union ib_gid));
 225
 226                 if (ret < 0)
 227                         n = n->rb_left;
 228                 else if (ret > 0)
 229                         n = n->rb_right;
 230                 else
 231                         return path;
 232         }
 233
 234         return NULL;
 235 }
 236
 237 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 238 {
 239         struct ipoib_dev_priv *priv = netdev_priv(dev);
 240         struct rb_node **n = &priv->path_tree.rb_node;
 241         struct rb_node *pn = NULL;
 242         struct ipoib_path *tpath;
 243         int ret;
 244
 245         while (*n) {
 246                 pn = *n;
 247                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 248
 249                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 250                              sizeof (union ib_gid));
 251                 if (ret < 0)
 252                         n = &pn->rb_left;
 253                 else if (ret > 0)
 254                         n = &pn->rb_right;
 255                 else
 256                         return -EEXIST;
 257         }
 258
 259         rb_link_node(&path->rb_node, pn, n);
 260         rb_insert_color(&path->rb_node, &priv->path_tree);
 261
 262         list_add_tail(&path->list, &priv->path_list);
 263
 264         return 0;
 265 }
 266
 267 static void path_free(struct net_device *dev, struct ipoib_path *path)
 268 {
 269         struct ipoib_dev_priv *priv = netdev_priv(dev);
 270         struct ipoib_neigh *neigh, *tn;
 271         struct sk_buff *skb;
 272         unsigned long flags;
 273
 274         while ((skb = __skb_dequeue(&path->queue)))
 275                 dev_kfree_skb_irq(skb);
 276
 277         spin_lock_irqsave(&priv->lock, flags);
 278
 279         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 280                 /*
 281                  * It's safe to call ipoib_put_ah() inside priv->lock
 282                  * here, because we know that path->ah will always
 283                  * hold one more reference, so ipoib_put_ah() will
 284                  * never do more than decrement the ref count.
 285                  */
 286                 if (neigh->ah)
 287                         ipoib_put_ah(neigh->ah);
 288
 289                 ipoib_neigh_free(dev, neigh);
 290         }
 291
 292         spin_unlock_irqrestore(&priv->lock, flags);
 293
 294         if (path->ah)
 295                 ipoib_put_ah(path->ah);
 296
 297         kfree(path);
 298 }
 299
 300 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 301
 302 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 303 {
 304         struct ipoib_path_iter *iter;
 305
 306         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 307         if (!iter)
 308                 return NULL;
 309
 310         iter->dev = dev;
 311         memset(iter->path.pathrec.dgid.raw, 0, 16);
 312
 313         if (ipoib_path_iter_next(iter)) {
 314                 kfree(iter);
 315                 return NULL;
 316         }
 317
 318         return iter;
 319 }
 320
 321 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 322 {
 323         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 324         struct rb_node *n;
 325         struct ipoib_path *path;
 326         int ret = 1;
 327
 328         spin_lock_irq(&priv->lock);
 329
 330         n = rb_first(&priv->path_tree);
 331
 332         while (n) {
 333                 path = rb_entry(n, struct ipoib_path, rb_node);
 334
 335                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 336                            sizeof (union ib_gid)) < 0) {
 337                         iter->path = *path;
 338                         ret = 0;
 339                         break;
 340                 }
 341
 342                 n = rb_next(n);
 343         }
 344
 345         spin_unlock_irq(&priv->lock);
 346
 347         return ret;
 348 }
 349
 350 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 351                           struct ipoib_path *path)
 352 {
 353         *path = iter->path;
 354 }
 355
 356 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 357
 358 void ipoib_mark_paths_invalid(struct net_device *dev)
 359 {
 360         struct ipoib_dev_priv *priv = netdev_priv(dev);
 361         struct ipoib_path *path, *tp;
 362
 363         spin_lock_irq(&priv->lock);
 364
 365         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 366                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
 367                         be16_to_cpu(path->pathrec.dlid),
 368                         path->pathrec.dgid.raw);
 369                 path->valid =  0;
 370         }
 371
 372         spin_unlock_irq(&priv->lock);
 373 }
 374
 375 void ipoib_flush_paths(struct net_device *dev)
 376 {
 377         struct ipoib_dev_priv *priv = netdev_priv(dev);
 378         struct ipoib_path *path, *tp;
 379         LIST_HEAD(remove_list);
 380         unsigned long flags;
 381
 382         netif_tx_lock_bh(dev);
 383         spin_lock_irqsave(&priv->lock, flags);
 384
 385         list_splice_init(&priv->path_list, &remove_list);
 386
 387         list_for_each_entry(path, &remove_list, list)
 388                 rb_erase(&path->rb_node, &priv->path_tree);
 389
 390         list_for_each_entry_safe(path, tp, &remove_list, list) {
 391                 if (path->query)
 392                         ib_sa_cancel_query(path->query_id, path->query);
 393                 spin_unlock_irqrestore(&priv->lock, flags);
 394                 netif_tx_unlock_bh(dev);
 395                 wait_for_completion(&path->done);
 396                 path_free(dev, path);
 397                 netif_tx_lock_bh(dev);
 398                 spin_lock_irqsave(&priv->lock, flags);
 399         }
 400
 401         spin_unlock_irqrestore(&priv->lock, flags);
 402         netif_tx_unlock_bh(dev);
 403 }
 404
 405 static void path_rec_completion(int status,
 406                                 struct ib_sa_path_rec *pathrec,
 407                                 void *path_ptr)
 408 {
 409         struct ipoib_path *path = path_ptr;
 410         struct net_device *dev = path->dev;
 411         struct ipoib_dev_priv *priv = netdev_priv(dev);
 412         struct ipoib_ah *ah = NULL;
 413         struct ipoib_ah *old_ah = NULL;
 414         struct ipoib_neigh *neigh, *tn;
 415         struct sk_buff_head skqueue;
 416         struct sk_buff *skb;
 417         unsigned long flags;
 418
 419         if (!status)
 420                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 421                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
 422         else
 423                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 424                           status, path->pathrec.dgid.raw);
 425
 426         skb_queue_head_init(&skqueue);
 427
 428         if (!status) {
 429                 struct ib_ah_attr av;
 430
 431                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 432                         ah = ipoib_create_ah(dev, priv->pd, &av);
 433         }
 434
 435         spin_lock_irqsave(&priv->lock, flags);
 436
 437         if (ah) {
 438                 path->pathrec = *pathrec;
 439
 440                 old_ah   = path->ah;
 441                 path->ah = ah;
 442
 443                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 444                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 445
 446                 while ((skb = __skb_dequeue(&path->queue)))
 447                         __skb_queue_tail(&skqueue, skb);
 448
 449                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 450                         if (neigh->ah) {
 451                                 WARN_ON(neigh->ah != old_ah);
 452                                 /*
 453                                  * Dropping the ah reference inside
 454                                  * priv->lock is safe here, because we
 455                                  * will hold one more reference from
 456                                  * the original value of path->ah (ie
 457                                  * old_ah).
 458                                  */
 459                                 ipoib_put_ah(neigh->ah);
 460                         }
 461                         kref_get(&path->ah->ref);
 462                         neigh->ah = path->ah;
 463                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 464                                sizeof(union ib_gid));
 465
 466                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 467                                 if (!ipoib_cm_get(neigh))
 468                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 469                                                                                path,
 470                                                                                neigh));
 471                                 if (!ipoib_cm_get(neigh)) {
 472                                         list_del(&neigh->list);
 473                                         if (neigh->ah)
 474                                                 ipoib_put_ah(neigh->ah);
 475                                         ipoib_neigh_free(dev, neigh);
 476                                         continue;
 477                                 }
 478                         }
 479
 480                         while ((skb = __skb_dequeue(&neigh->queue)))
 481                                 __skb_queue_tail(&skqueue, skb);
 482                 }
 483                 path->valid = 1;
 484         }
 485
 486         path->query = NULL;
 487         complete(&path->done);
 488
 489         spin_unlock_irqrestore(&priv->lock, flags);
 490
 491         if (old_ah)
 492                 ipoib_put_ah(old_ah);
 493
 494         while ((skb = __skb_dequeue(&skqueue))) {
 495                 skb->dev = dev;
 496                 if (dev_queue_xmit(skb))
 497                         ipoib_warn(priv, "dev_queue_xmit failed "
 498                                    "to requeue packet\n");
 499         }
 500 }
 501
 502 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 503 {
 504         struct ipoib_dev_priv *priv = netdev_priv(dev);
 505         struct ipoib_path *path;
 506
 507         if (!priv->broadcast)
 508                 return NULL;
 509
 510         path = kzalloc(sizeof *path, GFP_ATOMIC);
 511         if (!path)
 512                 return NULL;
 513
 514         path->dev = dev;
 515
 516         skb_queue_head_init(&path->queue);
 517
 518         INIT_LIST_HEAD(&path->neigh_list);
 519
 520         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 521         path->pathrec.sgid          = priv->local_gid;
 522         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 523         path->pathrec.numb_path     = 1;
 524         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 525
 526         return path;
 527 }
 528
 529 static int path_rec_start(struct net_device *dev,
 530                           struct ipoib_path *path)
 531 {
 532         struct ipoib_dev_priv *priv = netdev_priv(dev);
 533
 534         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 535                   path->pathrec.dgid.raw);
 536
 537         init_completion(&path->done);
 538
 539         path->query_id =
 540                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 541                                    &path->pathrec,
 542                                    IB_SA_PATH_REC_DGID          |
 543                                    IB_SA_PATH_REC_SGID          |
 544                                    IB_SA_PATH_REC_NUMB_PATH     |
 545                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 546                                    IB_SA_PATH_REC_PKEY,
 547                                    1000, GFP_ATOMIC,
 548                                    path_rec_completion,
 549                                    path, &path->query);
 550         if (path->query_id < 0) {
 551                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 552                 path->query = NULL;
 553                 complete(&path->done);
 554                 return path->query_id;
 555         }
 556
 557         return 0;
 558 }
 559
 560 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 561 {
 562         struct ipoib_dev_priv *priv = netdev_priv(dev);
 563         struct ipoib_path *path;
 564         struct ipoib_neigh *neigh;
 565         unsigned long flags;
 566
 567         neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
 568         if (!neigh) {
 569                 ++dev->stats.tx_dropped;
 570                 dev_kfree_skb_any(skb);
 571                 return;
 572         }
 573
 574         spin_lock_irqsave(&priv->lock, flags);
 575
 576         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 577         if (!path) {
 578                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 579                 if (!path)
 580                         goto err_path;
 581
 582                 __path_add(dev, path);
 583         }
 584
 585         list_add_tail(&neigh->list, &path->neigh_list);
 586
 587         if (path->ah) {
 588                 kref_get(&path->ah->ref);
 589                 neigh->ah = path->ah;
 590                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 591                        sizeof(union ib_gid));
 592
 593                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 594                         if (!ipoib_cm_get(neigh))
 595                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 596                         if (!ipoib_cm_get(neigh)) {
 597                                 list_del(&neigh->list);
 598                                 if (neigh->ah)
 599                                         ipoib_put_ah(neigh->ah);
 600                                 ipoib_neigh_free(dev, neigh);
 601                                 goto err_drop;
 602                         }
 603                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 604                                 __skb_queue_tail(&neigh->queue, skb);
 605                         else {
 606                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 607                                            skb_queue_len(&neigh->queue));
 608                                 goto err_drop;
 609                         }
 610                 } else
 611                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 612         } else {
 613                 neigh->ah  = NULL;
 614
 615                 if (!path->query && path_rec_start(dev, path))
 616                         goto err_list;
 617
 618                 __skb_queue_tail(&neigh->queue, skb);
 619         }
 620
 621         spin_unlock_irqrestore(&priv->lock, flags);
 622         return;
 623
 624 err_list:
 625         list_del(&neigh->list);
 626
 627 err_path:
 628         ipoib_neigh_free(dev, neigh);
 629 err_drop:
 630         ++dev->stats.tx_dropped;
 631         dev_kfree_skb_any(skb);
 632
 633         spin_unlock_irqrestore(&priv->lock, flags);
 634 }
 635
 636 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 637 {
 638         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 639
 640         /* Look up path record for unicasts */
 641         if (skb->dst->neighbour->ha[4] != 0xff) {
 642                 neigh_add_path(skb, dev);
 643                 return;
 644         }
 645
 646         /* Add in the P_Key for multicasts */
 647         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 648         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 649         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 650 }
 651
 652 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 653                              struct ipoib_pseudoheader *phdr)
 654 {
 655         struct ipoib_dev_priv *priv = netdev_priv(dev);
 656         struct ipoib_path *path;
 657         unsigned long flags;
 658
 659         spin_lock_irqsave(&priv->lock, flags);
 660
 661         path = __path_find(dev, phdr->hwaddr + 4);
 662         if (!path || !path->valid) {
 663                 int new_path = 0;
 664
 665                 if (!path) {
 666                         path = path_rec_create(dev, phdr->hwaddr + 4);
 667                         new_path = 1;
 668                 }
 669                 if (path) {
 670                         /* put pseudoheader back on for next time */
 671                         skb_push(skb, sizeof *phdr);
 672                         __skb_queue_tail(&path->queue, skb);
 673
 674                         if (!path->query && path_rec_start(dev, path)) {
 675                                 spin_unlock_irqrestore(&priv->lock, flags);
 676                                 if (new_path)
 677                                         path_free(dev, path);
 678                                 return;
 679                         } else
 680                                 __path_add(dev, path);
 681                 } else {
 682                         ++dev->stats.tx_dropped;
 683                         dev_kfree_skb_any(skb);
 684                 }
 685
 686                 spin_unlock_irqrestore(&priv->lock, flags);
 687                 return;
 688         }
 689
 690         if (path->ah) {
 691                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 692                           be16_to_cpu(path->pathrec.dlid));
 693
 694                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 695         } else if ((path->query || !path_rec_start(dev, path)) &&
 696                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 697                 /* put pseudoheader back on for next time */
 698                 skb_push(skb, sizeof *phdr);
 699                 __skb_queue_tail(&path->queue, skb);
 700         } else {
 701                 ++dev->stats.tx_dropped;
 702                 dev_kfree_skb_any(skb);
 703         }
 704
 705         spin_unlock_irqrestore(&priv->lock, flags);
 706 }
 707
 708 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 709 {
 710         struct ipoib_dev_priv *priv = netdev_priv(dev);
 711         struct ipoib_neigh *neigh;
 712         unsigned long flags;
 713
 714         if (likely(skb->dst && skb->dst->neighbour)) {
 715                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 716                         ipoib_path_lookup(skb, dev);
 717                         return NETDEV_TX_OK;
 718                 }
 719
 720                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 721
 722                 if (unlikely((memcmp(&neigh->dgid.raw,
 723                                      skb->dst->neighbour->ha + 4,
 724                                      sizeof(union ib_gid))) ||
 725                              (neigh->dev != dev))) {
 726                         spin_lock_irqsave(&priv->lock, flags);
 727                         /*
 728                          * It's safe to call ipoib_put_ah() inside
 729                          * priv->lock here, because we know that
 730                          * path->ah will always hold one more reference,
 731                          * so ipoib_put_ah() will never do more than
 732                          * decrement the ref count.
 733                          */
 734                         if (neigh->ah)
 735                                 ipoib_put_ah(neigh->ah);
 736                         list_del(&neigh->list);
 737                         ipoib_neigh_free(dev, neigh);
 738                         spin_unlock_irqrestore(&priv->lock, flags);
 739                         ipoib_path_lookup(skb, dev);
 740                         return NETDEV_TX_OK;
 741                 }
 742
 743                 if (ipoib_cm_get(neigh)) {
 744                         if (ipoib_cm_up(neigh)) {
 745                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 746                                 return NETDEV_TX_OK;
 747                         }
 748                 } else if (neigh->ah) {
 749                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 750                         return NETDEV_TX_OK;
 751                 }
 752
 753                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 754                         spin_lock_irqsave(&priv->lock, flags);
 755                         __skb_queue_tail(&neigh->queue, skb);
 756                         spin_unlock_irqrestore(&priv->lock, flags);
 757                 } else {
 758                         ++dev->stats.tx_dropped;
 759                         dev_kfree_skb_any(skb);
 760                 }
 761         } else {
 762                 struct ipoib_pseudoheader *phdr =
 763                         (struct ipoib_pseudoheader *) skb->data;
 764                 skb_pull(skb, sizeof *phdr);
 765
 766                 if (phdr->hwaddr[4] == 0xff) {
 767                         /* Add in the P_Key for multicast*/
 768                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 769                         phdr->hwaddr[9] = priv->pkey & 0xff;
 770
 771                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 772                 } else {
 773                         /* unicast GID -- should be ARP or RARP reply */
 774
 775                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 776                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 777                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
 778                                            skb->dst ? "neigh" : "dst",
 779                                            be16_to_cpup((__be16 *) skb->data),
 780                                            IPOIB_QPN(phdr->hwaddr),
 781                                            phdr->hwaddr + 4);
 782                                 dev_kfree_skb_any(skb);
 783                                 ++dev->stats.tx_dropped;
 784                                 return NETDEV_TX_OK;
 785                         }
 786
 787                         unicast_arp_send(skb, dev, phdr);
 788                 }
 789         }
 790
 791         return NETDEV_TX_OK;
 792 }
 793
 794 static void ipoib_timeout(struct net_device *dev)
 795 {
 796         struct ipoib_dev_priv *priv = netdev_priv(dev);
 797
 798         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 799                    jiffies_to_msecs(jiffies - dev->trans_start));
 800         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 801                    netif_queue_stopped(dev),
 802                    priv->tx_head, priv->tx_tail);
 803         /* XXX reset QP, etc. */
 804 }
 805
 806 static int ipoib_hard_header(struct sk_buff *skb,
 807                              struct net_device *dev,
 808                              unsigned short type,
 809                              const void *daddr, const void *saddr, unsigned len)
 810 {
 811         struct ipoib_header *header;
 812
 813         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 814
 815         header->proto = htons(type);
 816         header->reserved = 0;
 817
 818         /*
 819          * If we don't have a neighbour structure, stuff the
 820          * destination address onto the front of the skb so we can
 821          * figure out where to send the packet later.
 822          */
 823         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 824                 struct ipoib_pseudoheader *phdr =
 825                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 826                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 827         }
 828
 829         return 0;
 830 }
 831
 832 static void ipoib_set_mcast_list(struct net_device *dev)
 833 {
 834         struct ipoib_dev_priv *priv = netdev_priv(dev);
 835
 836         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 837                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 838                 return;
 839         }
 840
 841         queue_work(ipoib_workqueue, &priv->restart_task);
 842 }
 843
 844 static void ipoib_neigh_cleanup(struct neighbour *n)
 845 {
 846         struct ipoib_neigh *neigh;
 847         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 848         unsigned long flags;
 849         struct ipoib_ah *ah = NULL;
 850
 851         neigh = *to_ipoib_neigh(n);
 852         if (neigh)
 853                 priv = netdev_priv(neigh->dev);
 854         else
 855                 return;
 856         ipoib_dbg(priv,
 857                   "neigh_cleanup for %06x %pI6\n",
 858                   IPOIB_QPN(n->ha),
 859                   n->ha + 4);
 860
 861         spin_lock_irqsave(&priv->lock, flags);
 862
 863         if (neigh->ah)
 864                 ah = neigh->ah;
 865         list_del(&neigh->list);
 866         ipoib_neigh_free(n->dev, neigh);
 867
 868         spin_unlock_irqrestore(&priv->lock, flags);
 869
 870         if (ah)
 871                 ipoib_put_ah(ah);
 872 }
 873
 874 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
 875                                       struct net_device *dev)
 876 {
 877         struct ipoib_neigh *neigh;
 878
 879         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 880         if (!neigh)
 881                 return NULL;
 882
 883         neigh->neighbour = neighbour;
 884         neigh->dev = dev;
 885         *to_ipoib_neigh(neighbour) = neigh;
 886         skb_queue_head_init(&neigh->queue);
 887         ipoib_cm_set(neigh, NULL);
 888
 889         return neigh;
 890 }
 891
 892 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 893 {
 894         struct sk_buff *skb;
 895         *to_ipoib_neigh(neigh->neighbour) = NULL;
 896         while ((skb = __skb_dequeue(&neigh->queue))) {
 897                 ++dev->stats.tx_dropped;
 898                 dev_kfree_skb_any(skb);
 899         }
 900         if (ipoib_cm_get(neigh))
 901                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 902         kfree(neigh);
 903 }
 904
 905 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 906 {
 907         parms->neigh_cleanup = ipoib_neigh_cleanup;
 908
 909         return 0;
 910 }
 911
 912 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 913 {
 914         struct ipoib_dev_priv *priv = netdev_priv(dev);
 915
 916         /* Allocate RX/TX "rings" to hold queued skbs */
 917         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 918                                 GFP_KERNEL);
 919         if (!priv->rx_ring) {
 920                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 921                        ca->name, ipoib_recvq_size);
 922                 goto out;
 923         }
 924
 925         priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
 926         if (!priv->tx_ring) {
 927                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 928                        ca->name, ipoib_sendq_size);
 929                 goto out_rx_ring_cleanup;
 930         }
 931         memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
 932
 933         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 934
 935         if (ipoib_ib_dev_init(dev, ca, port))
 936                 goto out_tx_ring_cleanup;
 937
 938         return 0;
 939
 940 out_tx_ring_cleanup:
 941         vfree(priv->tx_ring);
 942
 943 out_rx_ring_cleanup:
 944         kfree(priv->rx_ring);
 945
 946 out:
 947         return -ENOMEM;
 948 }
 949
 950 void ipoib_dev_cleanup(struct net_device *dev)
 951 {
 952         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 953
 954         ipoib_delete_debug_files(dev);
 955
 956         /* Delete any child interfaces first */
 957         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 958                 unregister_netdev(cpriv->dev);
 959                 ipoib_dev_cleanup(cpriv->dev);
 960                 free_netdev(cpriv->dev);
 961         }
 962
 963         ipoib_ib_dev_cleanup(dev);
 964
 965         kfree(priv->rx_ring);
 966         vfree(priv->tx_ring);
 967
 968         priv->rx_ring = NULL;
 969         priv->tx_ring = NULL;
 970 }
 971
 972 static const struct header_ops ipoib_header_ops = {
 973         .create = ipoib_hard_header,
 974 };
 975
 976 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
 977                        void **tcph, u64 *hdr_flags, void *priv)
 978 {
 979         unsigned int ip_len;
 980         struct iphdr *iph;
 981
 982         if (unlikely(skb->protocol != htons(ETH_P_IP)))
 983                 return -1;
 984
 985         /*
 986          * In the future we may add an else clause that verifies the
 987          * checksum and allows devices which do not calculate checksum
 988          * to use LRO.
 989          */
 990         if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY))
 991                 return -1;
 992
 993         /* Check for non-TCP packet */
 994         skb_reset_network_header(skb);
 995         iph = ip_hdr(skb);
 996         if (iph->protocol != IPPROTO_TCP)
 997                 return -1;
 998
 999         ip_len = ip_hdrlen(skb);
1000         skb_set_transport_header(skb, ip_len);
1001         *tcph = tcp_hdr(skb);
1002
1003         /* check if IP header and TCP header are complete */
1004         if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
1005                 return -1;
1006
1007         *hdr_flags = LRO_IPV4 | LRO_TCP;
1008         *iphdr = iph;
1009
1010         return 0;
1011 }
1012
1013 static void ipoib_lro_setup(struct ipoib_dev_priv *priv)
1014 {
1015         priv->lro.lro_mgr.max_aggr       = lro_max_aggr;
1016         priv->lro.lro_mgr.max_desc       = IPOIB_MAX_LRO_DESCRIPTORS;
1017         priv->lro.lro_mgr.lro_arr        = priv->lro.lro_desc;
1018         priv->lro.lro_mgr.get_skb_header = get_skb_hdr;
1019         priv->lro.lro_mgr.features       = LRO_F_NAPI;
1020         priv->lro.lro_mgr.dev            = priv->dev;
1021         priv->lro.lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1022 }
1023
1024 static void ipoib_setup(struct net_device *dev)
1025 {
1026         struct ipoib_dev_priv *priv = netdev_priv(dev);
1027
1028         dev->open                = ipoib_open;
1029         dev->stop                = ipoib_stop;
1030         dev->change_mtu          = ipoib_change_mtu;
1031         dev->hard_start_xmit     = ipoib_start_xmit;
1032         dev->tx_timeout          = ipoib_timeout;
1033         dev->header_ops          = &ipoib_header_ops;
1034         dev->set_multicast_list  = ipoib_set_mcast_list;
1035         dev->neigh_setup         = ipoib_neigh_setup_dev;
1036
1037         ipoib_set_ethtool_ops(dev);
1038
1039         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1040
1041         dev->watchdog_timeo      = HZ;
1042
1043         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1044
1045         /*
1046          * We add in INFINIBAND_ALEN to allow for the destination
1047          * address "pseudoheader" for skbs without neighbour struct.
1048          */
1049         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1050         dev->addr_len            = INFINIBAND_ALEN;
1051         dev->type                = ARPHRD_INFINIBAND;
1052         dev->tx_queue_len        = ipoib_sendq_size * 2;
1053         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1054                                     NETIF_F_HIGHDMA);
1055
1056         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1057
1058         netif_carrier_off(dev);
1059
1060         priv->dev = dev;
1061
1062         ipoib_lro_setup(priv);
1063
1064         spin_lock_init(&priv->lock);
1065
1066         mutex_init(&priv->vlan_mutex);
1067
1068         INIT_LIST_HEAD(&priv->path_list);
1069         INIT_LIST_HEAD(&priv->child_intfs);
1070         INIT_LIST_HEAD(&priv->dead_ahs);
1071         INIT_LIST_HEAD(&priv->multicast_list);
1072
1073         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1074         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1075         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1076         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1077         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1078         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1079         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1080         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1081 }
1082
1083 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1084 {
1085         struct net_device *dev;
1086
1087         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1088                            ipoib_setup);
1089         if (!dev)
1090                 return NULL;
1091
1092         return netdev_priv(dev);
1093 }
1094
1095 static ssize_t show_pkey(struct device *dev,
1096                          struct device_attribute *attr, char *buf)
1097 {
1098         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1099
1100         return sprintf(buf, "0x%04x\n", priv->pkey);
1101 }
1102 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1103
1104 static ssize_t show_umcast(struct device *dev,
1105                            struct device_attribute *attr, char *buf)
1106 {
1107         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1108
1109         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1110 }
1111
1112 static ssize_t set_umcast(struct device *dev,
1113                           struct device_attribute *attr,
1114                           const char *buf, size_t count)
1115 {
1116         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1117         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1118
1119         if (umcast_val > 0) {
1120                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1121                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1122                                 "by userspace\n");
1123         } else
1124                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1125
1126         return count;
1127 }
1128 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1129
1130 int ipoib_add_umcast_attr(struct net_device *dev)
1131 {
1132         return device_create_file(&dev->dev, &dev_attr_umcast);
1133 }
1134
1135 static ssize_t create_child(struct device *dev,
1136                             struct device_attribute *attr,
1137                             const char *buf, size_t count)
1138 {
1139         int pkey;
1140         int ret;
1141
1142         if (sscanf(buf, "%i", &pkey) != 1)
1143                 return -EINVAL;
1144
1145         if (pkey < 0 || pkey > 0xffff)
1146                 return -EINVAL;
1147
1148         /*
1149          * Set the full membership bit, so that we join the right
1150          * broadcast group, etc.
1151          */
1152         pkey |= 0x8000;
1153
1154         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1155
1156         return ret ? ret : count;
1157 }
1158 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1159
1160 static ssize_t delete_child(struct device *dev,
1161                             struct device_attribute *attr,
1162                             const char *buf, size_t count)
1163 {
1164         int pkey;
1165         int ret;
1166
1167         if (sscanf(buf, "%i", &pkey) != 1)
1168                 return -EINVAL;
1169
1170         if (pkey < 0 || pkey > 0xffff)
1171                 return -EINVAL;
1172
1173         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1174
1175         return ret ? ret : count;
1176
1177 }
1178 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1179
1180 int ipoib_add_pkey_attr(struct net_device *dev)
1181 {
1182         return device_create_file(&dev->dev, &dev_attr_pkey);
1183 }
1184
1185 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1186 {
1187         struct ib_device_attr *device_attr;
1188         int result = -ENOMEM;
1189
1190         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1191         if (!device_attr) {
1192                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1193                        hca->name, sizeof *device_attr);
1194                 return result;
1195         }
1196
1197         result = ib_query_device(hca, device_attr);
1198         if (result) {
1199                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1200                        hca->name, result);
1201                 kfree(device_attr);
1202                 return result;
1203         }
1204         priv->hca_caps = device_attr->device_cap_flags;
1205
1206         kfree(device_attr);
1207
1208         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1209                 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1210                 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1211         }
1212
1213         if (lro)
1214                 priv->dev->features |= NETIF_F_LRO;
1215
1216         if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1217                 priv->dev->features |= NETIF_F_TSO;
1218
1219         return 0;
1220 }
1221
1222
1223 static struct net_device *ipoib_add_port(const char *format,
1224                                          struct ib_device *hca, u8 port)
1225 {
1226         struct ipoib_dev_priv *priv;
1227         struct ib_port_attr attr;
1228         int result = -ENOMEM;
1229
1230         priv = ipoib_intf_alloc(format);
1231         if (!priv)
1232                 goto alloc_mem_failed;
1233
1234         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1235
1236         if (!ib_query_port(hca, port, &attr))
1237                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1238         else {
1239                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1240                        hca->name, port);
1241                 goto device_init_failed;
1242         }
1243
1244         /* MTU will be reset when mcast join happens */
1245         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1246         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1247
1248         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1249         if (result) {
1250                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1251                        hca->name, port, result);
1252                 goto device_init_failed;
1253         }
1254
1255         if (ipoib_set_dev_features(priv, hca))
1256                 goto device_init_failed;
1257
1258         /*
1259          * Set the full membership bit, so that we join the right
1260          * broadcast group, etc.
1261          */
1262         priv->pkey |= 0x8000;
1263
1264         priv->dev->broadcast[8] = priv->pkey >> 8;
1265         priv->dev->broadcast[9] = priv->pkey & 0xff;
1266
1267         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1268         if (result) {
1269                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1270                        hca->name, port, result);
1271                 goto device_init_failed;
1272         } else
1273                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1274
1275         result = ipoib_dev_init(priv->dev, hca, port);
1276         if (result < 0) {
1277                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1278                        hca->name, port, result);
1279                 goto device_init_failed;
1280         }
1281
1282         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1283                               priv->ca, ipoib_event);
1284         result = ib_register_event_handler(&priv->event_handler);
1285         if (result < 0) {
1286                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1287                        "port %d (ret = %d)\n",
1288                        hca->name, port, result);
1289                 goto event_failed;
1290         }
1291
1292         result = register_netdev(priv->dev);
1293         if (result) {
1294                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1295                        hca->name, port, result);
1296                 goto register_failed;
1297         }
1298
1299         ipoib_create_debug_files(priv->dev);
1300
1301         if (ipoib_cm_add_mode_attr(priv->dev))
1302                 goto sysfs_failed;
1303         if (ipoib_add_pkey_attr(priv->dev))
1304                 goto sysfs_failed;
1305         if (ipoib_add_umcast_attr(priv->dev))
1306                 goto sysfs_failed;
1307         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1308                 goto sysfs_failed;
1309         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1310                 goto sysfs_failed;
1311
1312         return priv->dev;
1313
1314 sysfs_failed:
1315         ipoib_delete_debug_files(priv->dev);
1316         unregister_netdev(priv->dev);
1317
1318 register_failed:
1319         ib_unregister_event_handler(&priv->event_handler);
1320         flush_workqueue(ipoib_workqueue);
1321
1322 event_failed:
1323         ipoib_dev_cleanup(priv->dev);
1324
1325 device_init_failed:
1326         free_netdev(priv->dev);
1327
1328 alloc_mem_failed:
1329         return ERR_PTR(result);
1330 }
1331
1332 static void ipoib_add_one(struct ib_device *device)
1333 {
1334         struct list_head *dev_list;
1335         struct net_device *dev;
1336         struct ipoib_dev_priv *priv;
1337         int s, e, p;
1338
1339         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1340                 return;
1341
1342         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1343         if (!dev_list)
1344                 return;
1345
1346         INIT_LIST_HEAD(dev_list);
1347
1348         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1349                 s = 0;
1350                 e = 0;
1351         } else {
1352                 s = 1;
1353                 e = device->phys_port_cnt;
1354         }
1355
1356         for (p = s; p <= e; ++p) {
1357                 dev = ipoib_add_port("ib%d", device, p);
1358                 if (!IS_ERR(dev)) {
1359                         priv = netdev_priv(dev);
1360                         list_add_tail(&priv->list, dev_list);
1361                 }
1362         }
1363
1364         ib_set_client_data(device, &ipoib_client, dev_list);
1365 }
1366
1367 static void ipoib_remove_one(struct ib_device *device)
1368 {
1369         struct ipoib_dev_priv *priv, *tmp;
1370         struct list_head *dev_list;
1371
1372         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1373                 return;
1374
1375         dev_list = ib_get_client_data(device, &ipoib_client);
1376
1377         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1378                 ib_unregister_event_handler(&priv->event_handler);
1379
1380                 rtnl_lock();
1381                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1382                 rtnl_unlock();
1383
1384                 flush_workqueue(ipoib_workqueue);
1385
1386                 unregister_netdev(priv->dev);
1387                 ipoib_dev_cleanup(priv->dev);
1388                 free_netdev(priv->dev);
1389         }
1390
1391         kfree(dev_list);
1392 }
1393
1394 static int __init ipoib_init_module(void)
1395 {
1396         int ret;
1397
1398         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1399         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1400         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1401
1402         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1403         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1404         ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
1405                                                      IPOIB_MIN_QUEUE_SIZE));
1406 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1407         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1408 #endif
1409
1410         /*
1411          * When copying small received packets, we only copy from the
1412          * linear data part of the SKB, so we rely on this condition.
1413          */
1414         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1415
1416         ret = ipoib_register_debugfs();
1417         if (ret)
1418                 return ret;
1419
1420         /*
1421          * We create our own workqueue mainly because we want to be
1422          * able to flush it when devices are being removed.  We can't
1423          * use schedule_work()/flush_scheduled_work() because both
1424          * unregister_netdev() and linkwatch_event take the rtnl lock,
1425          * so flush_scheduled_work() can deadlock during device
1426          * removal.
1427          */
1428         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1429         if (!ipoib_workqueue) {
1430                 ret = -ENOMEM;
1431                 goto err_fs;
1432         }
1433
1434         ib_sa_register_client(&ipoib_sa_client);
1435
1436         ret = ib_register_client(&ipoib_client);
1437         if (ret)
1438                 goto err_sa;
1439
1440         return 0;
1441
1442 err_sa:
1443         ib_sa_unregister_client(&ipoib_sa_client);
1444         destroy_workqueue(ipoib_workqueue);
1445
1446 err_fs:
1447         ipoib_unregister_debugfs();
1448
1449         return ret;
1450 }
1451
1452 static void __exit ipoib_cleanup_module(void)
1453 {
1454         ib_unregister_client(&ipoib_client);
1455         ib_sa_unregister_client(&ipoib_sa_client);
1456         ipoib_unregister_debugfs();
1457         destroy_workqueue(ipoib_workqueue);
1458 }
1459
1460 module_init(ipoib_init_module);
1461 module_exit(ipoib_cleanup_module);