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   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
  35  */
  36
  37 #include "ipoib.h"
  38
  39 #include <linux/module.h>
  40
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/kernel.h>
  44
  45 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  46
  47 #include <linux/ip.h>
  48 #include <linux/in.h>
  49
  50 #include <net/dst.h>
  51
  52 MODULE_AUTHOR("Roland Dreier");
  53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  58
  59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  63
  64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  65 int ipoib_debug_level;
  66
  67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  69 #endif
  70
  71 struct ipoib_path_iter {
  72         struct net_device *dev;
  73         struct ipoib_path  path;
  74 };
  75
  76 static const u8 ipv4_bcast_addr[] = {
  77         0x00, 0xff, 0xff, 0xff,
  78         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  79         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  80 };
  81
  82 struct workqueue_struct *ipoib_workqueue;
  83
  84 struct ib_sa_client ipoib_sa_client;
  85
  86 static void ipoib_add_one(struct ib_device *device);
  87 static void ipoib_remove_one(struct ib_device *device);
  88
  89 static struct ib_client ipoib_client = {
  90         .name   = "ipoib",
  91         .add    = ipoib_add_one,
  92         .remove = ipoib_remove_one
  93 };
  94
  95 int ipoib_open(struct net_device *dev)
  96 {
  97         struct ipoib_dev_priv *priv = netdev_priv(dev);
  98
  99         ipoib_dbg(priv, "bringing up interface\n");
 100
 101         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 102
 103         if (ipoib_pkey_dev_delay_open(dev))
 104                 return 0;
 105
 106         if (ipoib_ib_dev_open(dev))
 107                 return -EINVAL;
 108
 109         if (ipoib_ib_dev_up(dev)) {
 110                 ipoib_ib_dev_stop(dev);
 111                 return -EINVAL;
 112         }
 113
 114         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 115                 struct ipoib_dev_priv *cpriv;
 116
 117                 /* Bring up any child interfaces too */
 118                 mutex_lock(&priv->vlan_mutex);
 119                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 120                         int flags;
 121
 122                         flags = cpriv->dev->flags;
 123                         if (flags & IFF_UP)
 124                                 continue;
 125
 126                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 127                 }
 128                 mutex_unlock(&priv->vlan_mutex);
 129         }
 130
 131         netif_start_queue(dev);
 132
 133         return 0;
 134 }
 135
 136 static int ipoib_stop(struct net_device *dev)
 137 {
 138         struct ipoib_dev_priv *priv = netdev_priv(dev);
 139
 140         ipoib_dbg(priv, "stopping interface\n");
 141
 142         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 143
 144         netif_stop_queue(dev);
 145
 146         clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
 147
 148         /*
 149          * Now flush workqueue to make sure a scheduled task doesn't
 150          * bring our internal state back up.
 151          */
 152         flush_workqueue(ipoib_workqueue);
 153
 154         ipoib_ib_dev_down(dev, 1);
 155         ipoib_ib_dev_stop(dev);
 156
 157         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 158                 struct ipoib_dev_priv *cpriv;
 159
 160                 /* Bring down any child interfaces too */
 161                 mutex_lock(&priv->vlan_mutex);
 162                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 163                         int flags;
 164
 165                         flags = cpriv->dev->flags;
 166                         if (!(flags & IFF_UP))
 167                                 continue;
 168
 169                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 170                 }
 171                 mutex_unlock(&priv->vlan_mutex);
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 178 {
 179         struct ipoib_dev_priv *priv = netdev_priv(dev);
 180
 181         /* dev->mtu > 2K ==> connected mode */
 182         if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
 183                 if (new_mtu > priv->mcast_mtu)
 184                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 185                                    priv->mcast_mtu);
 186                 dev->mtu = new_mtu;
 187                 return 0;
 188         }
 189
 190         if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN) {
 191                 return -EINVAL;
 192         }
 193
 194         priv->admin_mtu = new_mtu;
 195
 196         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 197
 198         return 0;
 199 }
 200
 201 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 202 {
 203         struct ipoib_dev_priv *priv = netdev_priv(dev);
 204         struct rb_node *n = priv->path_tree.rb_node;
 205         struct ipoib_path *path;
 206         int ret;
 207
 208         while (n) {
 209                 path = rb_entry(n, struct ipoib_path, rb_node);
 210
 211                 ret = memcmp(gid, path->pathrec.dgid.raw,
 212                              sizeof (union ib_gid));
 213
 214                 if (ret < 0)
 215                         n = n->rb_left;
 216                 else if (ret > 0)
 217                         n = n->rb_right;
 218                 else
 219                         return path;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 226 {
 227         struct ipoib_dev_priv *priv = netdev_priv(dev);
 228         struct rb_node **n = &priv->path_tree.rb_node;
 229         struct rb_node *pn = NULL;
 230         struct ipoib_path *tpath;
 231         int ret;
 232
 233         while (*n) {
 234                 pn = *n;
 235                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 236
 237                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 238                              sizeof (union ib_gid));
 239                 if (ret < 0)
 240                         n = &pn->rb_left;
 241                 else if (ret > 0)
 242                         n = &pn->rb_right;
 243                 else
 244                         return -EEXIST;
 245         }
 246
 247         rb_link_node(&path->rb_node, pn, n);
 248         rb_insert_color(&path->rb_node, &priv->path_tree);
 249
 250         list_add_tail(&path->list, &priv->path_list);
 251
 252         return 0;
 253 }
 254
 255 static void path_free(struct net_device *dev, struct ipoib_path *path)
 256 {
 257         struct ipoib_dev_priv *priv = netdev_priv(dev);
 258         struct ipoib_neigh *neigh, *tn;
 259         struct sk_buff *skb;
 260         unsigned long flags;
 261
 262         while ((skb = __skb_dequeue(&path->queue)))
 263                 dev_kfree_skb_irq(skb);
 264
 265         spin_lock_irqsave(&priv->lock, flags);
 266
 267         list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 268                 /*
 269                  * It's safe to call ipoib_put_ah() inside priv->lock
 270                  * here, because we know that path->ah will always
 271                  * hold one more reference, so ipoib_put_ah() will
 272                  * never do more than decrement the ref count.
 273                  */
 274                 if (neigh->ah)
 275                         ipoib_put_ah(neigh->ah);
 276
 277                 ipoib_neigh_free(dev, neigh);
 278         }
 279
 280         spin_unlock_irqrestore(&priv->lock, flags);
 281
 282         if (path->ah)
 283                 ipoib_put_ah(path->ah);
 284
 285         kfree(path);
 286 }
 287
 288 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 289
 290 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 291 {
 292         struct ipoib_path_iter *iter;
 293
 294         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 295         if (!iter)
 296                 return NULL;
 297
 298         iter->dev = dev;
 299         memset(iter->path.pathrec.dgid.raw, 0, 16);
 300
 301         if (ipoib_path_iter_next(iter)) {
 302                 kfree(iter);
 303                 return NULL;
 304         }
 305
 306         return iter;
 307 }
 308
 309 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 310 {
 311         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 312         struct rb_node *n;
 313         struct ipoib_path *path;
 314         int ret = 1;
 315
 316         spin_lock_irq(&priv->lock);
 317
 318         n = rb_first(&priv->path_tree);
 319
 320         while (n) {
 321                 path = rb_entry(n, struct ipoib_path, rb_node);
 322
 323                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 324                            sizeof (union ib_gid)) < 0) {
 325                         iter->path = *path;
 326                         ret = 0;
 327                         break;
 328                 }
 329
 330                 n = rb_next(n);
 331         }
 332
 333         spin_unlock_irq(&priv->lock);
 334
 335         return ret;
 336 }
 337
 338 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 339                           struct ipoib_path *path)
 340 {
 341         *path = iter->path;
 342 }
 343
 344 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 345
 346 void ipoib_flush_paths(struct net_device *dev)
 347 {
 348         struct ipoib_dev_priv *priv = netdev_priv(dev);
 349         struct ipoib_path *path, *tp;
 350         LIST_HEAD(remove_list);
 351
 352         spin_lock_irq(&priv->tx_lock);
 353         spin_lock(&priv->lock);
 354
 355         list_splice(&priv->path_list, &remove_list);
 356         INIT_LIST_HEAD(&priv->path_list);
 357
 358         list_for_each_entry(path, &remove_list, list)
 359                 rb_erase(&path->rb_node, &priv->path_tree);
 360
 361         list_for_each_entry_safe(path, tp, &remove_list, list) {
 362                 if (path->query)
 363                         ib_sa_cancel_query(path->query_id, path->query);
 364                 spin_unlock(&priv->lock);
 365                 spin_unlock_irq(&priv->tx_lock);
 366                 wait_for_completion(&path->done);
 367                 path_free(dev, path);
 368                 spin_lock_irq(&priv->tx_lock);
 369                 spin_lock(&priv->lock);
 370         }
 371         spin_unlock(&priv->lock);
 372         spin_unlock_irq(&priv->tx_lock);
 373 }
 374
 375 static void path_rec_completion(int status,
 376                                 struct ib_sa_path_rec *pathrec,
 377                                 void *path_ptr)
 378 {
 379         struct ipoib_path *path = path_ptr;
 380         struct net_device *dev = path->dev;
 381         struct ipoib_dev_priv *priv = netdev_priv(dev);
 382         struct ipoib_ah *ah = NULL;
 383         struct ipoib_neigh *neigh;
 384         struct sk_buff_head skqueue;
 385         struct sk_buff *skb;
 386         unsigned long flags;
 387
 388         if (pathrec)
 389                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
 390                           be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
 391         else
 392                 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
 393                           status, IPOIB_GID_ARG(path->pathrec.dgid));
 394
 395         skb_queue_head_init(&skqueue);
 396
 397         if (!status) {
 398                 struct ib_ah_attr av = {
 399                         .dlid          = be16_to_cpu(pathrec->dlid),
 400                         .sl            = pathrec->sl,
 401                         .port_num      = priv->port,
 402                         .static_rate   = pathrec->rate
 403                 };
 404
 405                 ah = ipoib_create_ah(dev, priv->pd, &av);
 406         }
 407
 408         spin_lock_irqsave(&priv->lock, flags);
 409
 410         path->ah = ah;
 411
 412         if (ah) {
 413                 path->pathrec = *pathrec;
 414
 415                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 416                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 417
 418                 while ((skb = __skb_dequeue(&path->queue)))
 419                         __skb_queue_tail(&skqueue, skb);
 420
 421                 list_for_each_entry(neigh, &path->neigh_list, list) {
 422                         kref_get(&path->ah->ref);
 423                         neigh->ah = path->ah;
 424                         memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 425                                sizeof(union ib_gid));
 426
 427                         if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 428                                 if (!ipoib_cm_get(neigh))
 429                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 430                                                                                path,
 431                                                                                neigh));
 432                                 if (!ipoib_cm_get(neigh)) {
 433                                         list_del(&neigh->list);
 434                                         if (neigh->ah)
 435                                                 ipoib_put_ah(neigh->ah);
 436                                         ipoib_neigh_free(dev, neigh);
 437                                         continue;
 438                                 }
 439                         }
 440
 441                         while ((skb = __skb_dequeue(&neigh->queue)))
 442                                 __skb_queue_tail(&skqueue, skb);
 443                 }
 444         }
 445
 446         path->query = NULL;
 447         complete(&path->done);
 448
 449         spin_unlock_irqrestore(&priv->lock, flags);
 450
 451         while ((skb = __skb_dequeue(&skqueue))) {
 452                 skb->dev = dev;
 453                 if (dev_queue_xmit(skb))
 454                         ipoib_warn(priv, "dev_queue_xmit failed "
 455                                    "to requeue packet\n");
 456         }
 457 }
 458
 459 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 460 {
 461         struct ipoib_dev_priv *priv = netdev_priv(dev);
 462         struct ipoib_path *path;
 463
 464         path = kzalloc(sizeof *path, GFP_ATOMIC);
 465         if (!path)
 466                 return NULL;
 467
 468         path->dev = dev;
 469
 470         skb_queue_head_init(&path->queue);
 471
 472         INIT_LIST_HEAD(&path->neigh_list);
 473
 474         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 475         path->pathrec.sgid      = priv->local_gid;
 476         path->pathrec.pkey      = cpu_to_be16(priv->pkey);
 477         path->pathrec.numb_path = 1;
 478
 479         return path;
 480 }
 481
 482 static int path_rec_start(struct net_device *dev,
 483                           struct ipoib_path *path)
 484 {
 485         struct ipoib_dev_priv *priv = netdev_priv(dev);
 486
 487         ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
 488                   IPOIB_GID_ARG(path->pathrec.dgid));
 489
 490         init_completion(&path->done);
 491
 492         path->query_id =
 493                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 494                                    &path->pathrec,
 495                                    IB_SA_PATH_REC_DGID          |
 496                                    IB_SA_PATH_REC_SGID          |
 497                                    IB_SA_PATH_REC_NUMB_PATH     |
 498                                    IB_SA_PATH_REC_PKEY,
 499                                    1000, GFP_ATOMIC,
 500                                    path_rec_completion,
 501                                    path, &path->query);
 502         if (path->query_id < 0) {
 503                 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
 504                 path->query = NULL;
 505                 return path->query_id;
 506         }
 507
 508         return 0;
 509 }
 510
 511 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 512 {
 513         struct ipoib_dev_priv *priv = netdev_priv(dev);
 514         struct ipoib_path *path;
 515         struct ipoib_neigh *neigh;
 516
 517         neigh = ipoib_neigh_alloc(skb->dst->neighbour);
 518         if (!neigh) {
 519                 ++priv->stats.tx_dropped;
 520                 dev_kfree_skb_any(skb);
 521                 return;
 522         }
 523
 524         /*
 525          * We can only be called from ipoib_start_xmit, so we're
 526          * inside tx_lock -- no need to save/restore flags.
 527          */
 528         spin_lock(&priv->lock);
 529
 530         path = __path_find(dev, skb->dst->neighbour->ha + 4);
 531         if (!path) {
 532                 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
 533                 if (!path)
 534                         goto err_path;
 535
 536                 __path_add(dev, path);
 537         }
 538
 539         list_add_tail(&neigh->list, &path->neigh_list);
 540
 541         if (path->ah) {
 542                 kref_get(&path->ah->ref);
 543                 neigh->ah = path->ah;
 544                 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
 545                        sizeof(union ib_gid));
 546
 547                 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
 548                         if (!ipoib_cm_get(neigh))
 549                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 550                         if (!ipoib_cm_get(neigh)) {
 551                                 list_del(&neigh->list);
 552                                 if (neigh->ah)
 553                                         ipoib_put_ah(neigh->ah);
 554                                 ipoib_neigh_free(dev, neigh);
 555                                 goto err_drop;
 556                         }
 557                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 558                                 __skb_queue_tail(&neigh->queue, skb);
 559                         else {
 560                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 561                                            skb_queue_len(&neigh->queue));
 562                                 goto err_drop;
 563                         }
 564                 } else
 565                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 566         } else {
 567                 neigh->ah  = NULL;
 568
 569                 if (!path->query && path_rec_start(dev, path))
 570                         goto err_list;
 571
 572                 __skb_queue_tail(&neigh->queue, skb);
 573         }
 574
 575         spin_unlock(&priv->lock);
 576         return;
 577
 578 err_list:
 579         list_del(&neigh->list);
 580
 581 err_path:
 582         ipoib_neigh_free(dev, neigh);
 583 err_drop:
 584         ++priv->stats.tx_dropped;
 585         dev_kfree_skb_any(skb);
 586
 587         spin_unlock(&priv->lock);
 588 }
 589
 590 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
 591 {
 592         struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
 593
 594         /* Look up path record for unicasts */
 595         if (skb->dst->neighbour->ha[4] != 0xff) {
 596                 neigh_add_path(skb, dev);
 597                 return;
 598         }
 599
 600         /* Add in the P_Key for multicasts */
 601         skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
 602         skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
 603         ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
 604 }
 605
 606 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 607                              struct ipoib_pseudoheader *phdr)
 608 {
 609         struct ipoib_dev_priv *priv = netdev_priv(dev);
 610         struct ipoib_path *path;
 611
 612         /*
 613          * We can only be called from ipoib_start_xmit, so we're
 614          * inside tx_lock -- no need to save/restore flags.
 615          */
 616         spin_lock(&priv->lock);
 617
 618         path = __path_find(dev, phdr->hwaddr + 4);
 619         if (!path) {
 620                 path = path_rec_create(dev, phdr->hwaddr + 4);
 621                 if (path) {
 622                         /* put pseudoheader back on for next time */
 623                         skb_push(skb, sizeof *phdr);
 624                         __skb_queue_tail(&path->queue, skb);
 625
 626                         if (path_rec_start(dev, path)) {
 627                                 spin_unlock(&priv->lock);
 628                                 path_free(dev, path);
 629                                 return;
 630                         } else
 631                                 __path_add(dev, path);
 632                 } else {
 633                         ++priv->stats.tx_dropped;
 634                         dev_kfree_skb_any(skb);
 635                 }
 636
 637                 spin_unlock(&priv->lock);
 638                 return;
 639         }
 640
 641         if (path->ah) {
 642                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 643                           be16_to_cpu(path->pathrec.dlid));
 644
 645                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
 646         } else if ((path->query || !path_rec_start(dev, path)) &&
 647                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 648                 /* put pseudoheader back on for next time */
 649                 skb_push(skb, sizeof *phdr);
 650                 __skb_queue_tail(&path->queue, skb);
 651         } else {
 652                 ++priv->stats.tx_dropped;
 653                 dev_kfree_skb_any(skb);
 654         }
 655
 656         spin_unlock(&priv->lock);
 657 }
 658
 659 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 660 {
 661         struct ipoib_dev_priv *priv = netdev_priv(dev);
 662         struct ipoib_neigh *neigh;
 663         unsigned long flags;
 664
 665         if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 666                 return NETDEV_TX_LOCKED;
 667
 668         /*
 669          * Check if our queue is stopped.  Since we have the LLTX bit
 670          * set, we can't rely on netif_stop_queue() preventing our
 671          * xmit function from being called with a full queue.
 672          */
 673         if (unlikely(netif_queue_stopped(dev))) {
 674                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 675                 return NETDEV_TX_BUSY;
 676         }
 677
 678         if (likely(skb->dst && skb->dst->neighbour)) {
 679                 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 680                         ipoib_path_lookup(skb, dev);
 681                         goto out;
 682                 }
 683
 684                 neigh = *to_ipoib_neigh(skb->dst->neighbour);
 685
 686                 if (ipoib_cm_get(neigh)) {
 687                         if (ipoib_cm_up(neigh)) {
 688                                 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 689                                 goto out;
 690                         }
 691                 } else if (neigh->ah) {
 692                         if (unlikely(memcmp(&neigh->dgid.raw,
 693                                             skb->dst->neighbour->ha + 4,
 694                                             sizeof(union ib_gid)))) {
 695                                 spin_lock(&priv->lock);
 696                                 /*
 697                                  * It's safe to call ipoib_put_ah() inside
 698                                  * priv->lock here, because we know that
 699                                  * path->ah will always hold one more reference,
 700                                  * so ipoib_put_ah() will never do more than
 701                                  * decrement the ref count.
 702                                  */
 703                                 ipoib_put_ah(neigh->ah);
 704                                 list_del(&neigh->list);
 705                                 ipoib_neigh_free(dev, neigh);
 706                                 spin_unlock(&priv->lock);
 707                                 ipoib_path_lookup(skb, dev);
 708                                 goto out;
 709                         }
 710
 711                         ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
 712                         goto out;
 713                 }
 714
 715                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 716                         spin_lock(&priv->lock);
 717                         __skb_queue_tail(&neigh->queue, skb);
 718                         spin_unlock(&priv->lock);
 719                 } else {
 720                         ++priv->stats.tx_dropped;
 721                         dev_kfree_skb_any(skb);
 722                 }
 723         } else {
 724                 struct ipoib_pseudoheader *phdr =
 725                         (struct ipoib_pseudoheader *) skb->data;
 726                 skb_pull(skb, sizeof *phdr);
 727
 728                 if (phdr->hwaddr[4] == 0xff) {
 729                         /* Add in the P_Key for multicast*/
 730                         phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 731                         phdr->hwaddr[9] = priv->pkey & 0xff;
 732
 733                         ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
 734                 } else {
 735                         /* unicast GID -- should be ARP or RARP reply */
 736
 737                         if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
 738                             (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
 739                                 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
 740                                            IPOIB_GID_FMT "\n",
 741                                            skb->dst ? "neigh" : "dst",
 742                                            be16_to_cpup((__be16 *) skb->data),
 743                                            IPOIB_QPN(phdr->hwaddr),
 744                                            IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
 745                                 dev_kfree_skb_any(skb);
 746                                 ++priv->stats.tx_dropped;
 747                                 goto out;
 748                         }
 749
 750                         unicast_arp_send(skb, dev, phdr);
 751                 }
 752         }
 753
 754 out:
 755         spin_unlock_irqrestore(&priv->tx_lock, flags);
 756
 757         return NETDEV_TX_OK;
 758 }
 759
 760 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
 761 {
 762         struct ipoib_dev_priv *priv = netdev_priv(dev);
 763
 764         return &priv->stats;
 765 }
 766
 767 static void ipoib_timeout(struct net_device *dev)
 768 {
 769         struct ipoib_dev_priv *priv = netdev_priv(dev);
 770
 771         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 772                    jiffies_to_msecs(jiffies - dev->trans_start));
 773         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 774                    netif_queue_stopped(dev),
 775                    priv->tx_head, priv->tx_tail);
 776         /* XXX reset QP, etc. */
 777 }
 778
 779 static int ipoib_hard_header(struct sk_buff *skb,
 780                              struct net_device *dev,
 781                              unsigned short type,
 782                              void *daddr, void *saddr, unsigned len)
 783 {
 784         struct ipoib_header *header;
 785
 786         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 787
 788         header->proto = htons(type);
 789         header->reserved = 0;
 790
 791         /*
 792          * If we don't have a neighbour structure, stuff the
 793          * destination address onto the front of the skb so we can
 794          * figure out where to send the packet later.
 795          */
 796         if ((!skb->dst || !skb->dst->neighbour) && daddr) {
 797                 struct ipoib_pseudoheader *phdr =
 798                         (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
 799                 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 800         }
 801
 802         return 0;
 803 }
 804
 805 static void ipoib_set_mcast_list(struct net_device *dev)
 806 {
 807         struct ipoib_dev_priv *priv = netdev_priv(dev);
 808
 809         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 810                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 811                 return;
 812         }
 813
 814         queue_work(ipoib_workqueue, &priv->restart_task);
 815 }
 816
 817 static void ipoib_neigh_destructor(struct neighbour *n)
 818 {
 819         struct ipoib_neigh *neigh;
 820         struct ipoib_dev_priv *priv = netdev_priv(n->dev);
 821         unsigned long flags;
 822         struct ipoib_ah *ah = NULL;
 823
 824         ipoib_dbg(priv,
 825                   "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
 826                   IPOIB_QPN(n->ha),
 827                   IPOIB_GID_RAW_ARG(n->ha + 4));
 828
 829         spin_lock_irqsave(&priv->lock, flags);
 830
 831         neigh = *to_ipoib_neigh(n);
 832         if (neigh) {
 833                 if (neigh->ah)
 834                         ah = neigh->ah;
 835                 list_del(&neigh->list);
 836                 ipoib_neigh_free(n->dev, neigh);
 837         }
 838
 839         spin_unlock_irqrestore(&priv->lock, flags);
 840
 841         if (ah)
 842                 ipoib_put_ah(ah);
 843 }
 844
 845 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
 846 {
 847         struct ipoib_neigh *neigh;
 848
 849         neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 850         if (!neigh)
 851                 return NULL;
 852
 853         neigh->neighbour = neighbour;
 854         *to_ipoib_neigh(neighbour) = neigh;
 855         skb_queue_head_init(&neigh->queue);
 856         ipoib_cm_set(neigh, NULL);
 857
 858         return neigh;
 859 }
 860
 861 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
 862 {
 863         struct ipoib_dev_priv *priv = netdev_priv(dev);
 864         struct sk_buff *skb;
 865         *to_ipoib_neigh(neigh->neighbour) = NULL;
 866         while ((skb = __skb_dequeue(&neigh->queue))) {
 867                 ++priv->stats.tx_dropped;
 868                 dev_kfree_skb_any(skb);
 869         }
 870         if (ipoib_cm_get(neigh))
 871                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
 872         kfree(neigh);
 873 }
 874
 875 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 876 {
 877         parms->neigh_destructor = ipoib_neigh_destructor;
 878
 879         return 0;
 880 }
 881
 882 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 883 {
 884         struct ipoib_dev_priv *priv = netdev_priv(dev);
 885
 886         /* Allocate RX/TX "rings" to hold queued skbs */
 887         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
 888                                 GFP_KERNEL);
 889         if (!priv->rx_ring) {
 890                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
 891                        ca->name, ipoib_recvq_size);
 892                 goto out;
 893         }
 894
 895         priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
 896                                 GFP_KERNEL);
 897         if (!priv->tx_ring) {
 898                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
 899                        ca->name, ipoib_sendq_size);
 900                 goto out_rx_ring_cleanup;
 901         }
 902
 903         /* priv->tx_head & tx_tail are already 0 */
 904
 905         if (ipoib_ib_dev_init(dev, ca, port))
 906                 goto out_tx_ring_cleanup;
 907
 908         return 0;
 909
 910 out_tx_ring_cleanup:
 911         kfree(priv->tx_ring);
 912
 913 out_rx_ring_cleanup:
 914         kfree(priv->rx_ring);
 915
 916 out:
 917         return -ENOMEM;
 918 }
 919
 920 void ipoib_dev_cleanup(struct net_device *dev)
 921 {
 922         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
 923
 924         ipoib_delete_debug_files(dev);
 925
 926         /* Delete any child interfaces first */
 927         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
 928                 unregister_netdev(cpriv->dev);
 929                 ipoib_dev_cleanup(cpriv->dev);
 930                 free_netdev(cpriv->dev);
 931         }
 932
 933         ipoib_ib_dev_cleanup(dev);
 934
 935         kfree(priv->rx_ring);
 936         kfree(priv->tx_ring);
 937
 938         priv->rx_ring = NULL;
 939         priv->tx_ring = NULL;
 940 }
 941
 942 static void ipoib_setup(struct net_device *dev)
 943 {
 944         struct ipoib_dev_priv *priv = netdev_priv(dev);
 945
 946         dev->open                = ipoib_open;
 947         dev->stop                = ipoib_stop;
 948         dev->change_mtu          = ipoib_change_mtu;
 949         dev->hard_start_xmit     = ipoib_start_xmit;
 950         dev->get_stats           = ipoib_get_stats;
 951         dev->tx_timeout          = ipoib_timeout;
 952         dev->hard_header         = ipoib_hard_header;
 953         dev->set_multicast_list  = ipoib_set_mcast_list;
 954         dev->neigh_setup         = ipoib_neigh_setup_dev;
 955
 956         dev->watchdog_timeo      = HZ;
 957
 958         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
 959
 960         /*
 961          * We add in INFINIBAND_ALEN to allow for the destination
 962          * address "pseudoheader" for skbs without neighbour struct.
 963          */
 964         dev->hard_header_len     = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
 965         dev->addr_len            = INFINIBAND_ALEN;
 966         dev->type                = ARPHRD_INFINIBAND;
 967         dev->tx_queue_len        = ipoib_sendq_size * 2;
 968         dev->features            = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
 969
 970         /* MTU will be reset when mcast join happens */
 971         dev->mtu                 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
 972         priv->mcast_mtu          = priv->admin_mtu = dev->mtu;
 973
 974         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
 975
 976         netif_carrier_off(dev);
 977
 978         SET_MODULE_OWNER(dev);
 979
 980         priv->dev = dev;
 981
 982         spin_lock_init(&priv->lock);
 983         spin_lock_init(&priv->tx_lock);
 984
 985         mutex_init(&priv->mcast_mutex);
 986         mutex_init(&priv->vlan_mutex);
 987
 988         INIT_LIST_HEAD(&priv->path_list);
 989         INIT_LIST_HEAD(&priv->child_intfs);
 990         INIT_LIST_HEAD(&priv->dead_ahs);
 991         INIT_LIST_HEAD(&priv->multicast_list);
 992
 993         INIT_DELAYED_WORK(&priv->pkey_task,    ipoib_pkey_poll);
 994         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 995         INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
 996         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
 997         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
 998 }
 999
1000 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1001 {
1002         struct net_device *dev;
1003
1004         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1005                            ipoib_setup);
1006         if (!dev)
1007                 return NULL;
1008
1009         return netdev_priv(dev);
1010 }
1011
1012 static ssize_t show_pkey(struct device *dev,
1013                          struct device_attribute *attr, char *buf)
1014 {
1015         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1016
1017         return sprintf(buf, "0x%04x\n", priv->pkey);
1018 }
1019 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1020
1021 static ssize_t create_child(struct device *dev,
1022                             struct device_attribute *attr,
1023                             const char *buf, size_t count)
1024 {
1025         int pkey;
1026         int ret;
1027
1028         if (sscanf(buf, "%i", &pkey) != 1)
1029                 return -EINVAL;
1030
1031         if (pkey < 0 || pkey > 0xffff)
1032                 return -EINVAL;
1033
1034         /*
1035          * Set the full membership bit, so that we join the right
1036          * broadcast group, etc.
1037          */
1038         pkey |= 0x8000;
1039
1040         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1041
1042         return ret ? ret : count;
1043 }
1044 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1045
1046 static ssize_t delete_child(struct device *dev,
1047                             struct device_attribute *attr,
1048                             const char *buf, size_t count)
1049 {
1050         int pkey;
1051         int ret;
1052
1053         if (sscanf(buf, "%i", &pkey) != 1)
1054                 return -EINVAL;
1055
1056         if (pkey < 0 || pkey > 0xffff)
1057                 return -EINVAL;
1058
1059         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1060
1061         return ret ? ret : count;
1062
1063 }
1064 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1065
1066 int ipoib_add_pkey_attr(struct net_device *dev)
1067 {
1068         return device_create_file(&dev->dev, &dev_attr_pkey);
1069 }
1070
1071 static struct net_device *ipoib_add_port(const char *format,
1072                                          struct ib_device *hca, u8 port)
1073 {
1074         struct ipoib_dev_priv *priv;
1075         int result = -ENOMEM;
1076
1077         priv = ipoib_intf_alloc(format);
1078         if (!priv)
1079                 goto alloc_mem_failed;
1080
1081         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1082
1083         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1084         if (result) {
1085                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1086                        hca->name, port, result);
1087                 goto alloc_mem_failed;
1088         }
1089
1090         /*
1091          * Set the full membership bit, so that we join the right
1092          * broadcast group, etc.
1093          */
1094         priv->pkey |= 0x8000;
1095
1096         priv->dev->broadcast[8] = priv->pkey >> 8;
1097         priv->dev->broadcast[9] = priv->pkey & 0xff;
1098
1099         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1100         if (result) {
1101                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1102                        hca->name, port, result);
1103                 goto alloc_mem_failed;
1104         } else
1105                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1106
1107
1108         result = ipoib_dev_init(priv->dev, hca, port);
1109         if (result < 0) {
1110                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1111                        hca->name, port, result);
1112                 goto device_init_failed;
1113         }
1114
1115         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1116                               priv->ca, ipoib_event);
1117         result = ib_register_event_handler(&priv->event_handler);
1118         if (result < 0) {
1119                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1120                        "port %d (ret = %d)\n",
1121                        hca->name, port, result);
1122                 goto event_failed;
1123         }
1124
1125         result = register_netdev(priv->dev);
1126         if (result) {
1127                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1128                        hca->name, port, result);
1129                 goto register_failed;
1130         }
1131
1132         ipoib_create_debug_files(priv->dev);
1133
1134         if (ipoib_cm_add_mode_attr(priv->dev))
1135                 goto sysfs_failed;
1136         if (ipoib_add_pkey_attr(priv->dev))
1137                 goto sysfs_failed;
1138         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1139                 goto sysfs_failed;
1140         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1141                 goto sysfs_failed;
1142
1143         return priv->dev;
1144
1145 sysfs_failed:
1146         ipoib_delete_debug_files(priv->dev);
1147         unregister_netdev(priv->dev);
1148
1149 register_failed:
1150         ib_unregister_event_handler(&priv->event_handler);
1151         flush_scheduled_work();
1152
1153 event_failed:
1154         ipoib_dev_cleanup(priv->dev);
1155
1156 device_init_failed:
1157         free_netdev(priv->dev);
1158
1159 alloc_mem_failed:
1160         return ERR_PTR(result);
1161 }
1162
1163 static void ipoib_add_one(struct ib_device *device)
1164 {
1165         struct list_head *dev_list;
1166         struct net_device *dev;
1167         struct ipoib_dev_priv *priv;
1168         int s, e, p;
1169
1170         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1171                 return;
1172
1173         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1174         if (!dev_list)
1175                 return;
1176
1177         INIT_LIST_HEAD(dev_list);
1178
1179         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1180                 s = 0;
1181                 e = 0;
1182         } else {
1183                 s = 1;
1184                 e = device->phys_port_cnt;
1185         }
1186
1187         for (p = s; p <= e; ++p) {
1188                 dev = ipoib_add_port("ib%d", device, p);
1189                 if (!IS_ERR(dev)) {
1190                         priv = netdev_priv(dev);
1191                         list_add_tail(&priv->list, dev_list);
1192                 }
1193         }
1194
1195         ib_set_client_data(device, &ipoib_client, dev_list);
1196 }
1197
1198 static void ipoib_remove_one(struct ib_device *device)
1199 {
1200         struct ipoib_dev_priv *priv, *tmp;
1201         struct list_head *dev_list;
1202
1203         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1204                 return;
1205
1206         dev_list = ib_get_client_data(device, &ipoib_client);
1207
1208         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1209                 ib_unregister_event_handler(&priv->event_handler);
1210                 flush_scheduled_work();
1211
1212                 unregister_netdev(priv->dev);
1213                 ipoib_dev_cleanup(priv->dev);
1214                 free_netdev(priv->dev);
1215         }
1216
1217         kfree(dev_list);
1218 }
1219
1220 static int __init ipoib_init_module(void)
1221 {
1222         int ret;
1223
1224         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1225         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1226         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1227
1228         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1229         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1230         ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1231
1232         ret = ipoib_register_debugfs();
1233         if (ret)
1234                 return ret;
1235
1236         /*
1237          * We create our own workqueue mainly because we want to be
1238          * able to flush it when devices are being removed.  We can't
1239          * use schedule_work()/flush_scheduled_work() because both
1240          * unregister_netdev() and linkwatch_event take the rtnl lock,
1241          * so flush_scheduled_work() can deadlock during device
1242          * removal.
1243          */
1244         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1245         if (!ipoib_workqueue) {
1246                 ret = -ENOMEM;
1247                 goto err_fs;
1248         }
1249
1250         ib_sa_register_client(&ipoib_sa_client);
1251
1252         ret = ib_register_client(&ipoib_client);
1253         if (ret)
1254                 goto err_sa;
1255
1256         return 0;
1257
1258 err_sa:
1259         ib_sa_unregister_client(&ipoib_sa_client);
1260         destroy_workqueue(ipoib_workqueue);
1261
1262 err_fs:
1263         ipoib_unregister_debugfs();
1264
1265         return ret;
1266 }
1267
1268 static void __exit ipoib_cleanup_module(void)
1269 {
1270         ib_unregister_client(&ipoib_client);
1271         ib_sa_unregister_client(&ipoib_sa_client);
1272         ipoib_unregister_debugfs();
1273         destroy_workqueue(ipoib_workqueue);
1274 }
1275
1276 module_init(ipoib_init_module);
1277 module_exit(ipoib_cleanup_module);