drivers/infiniband/ulp/ipoib/ipoib_main.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include "ipoib.h"
  36
  37 #include <linux/module.h>
  38
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/kernel.h>
  42 #include <linux/vmalloc.h>
  43
  44 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
  45
  46 #include <linux/ip.h>
  47 #include <linux/in.h>
  48
  49 #include <linux/jhash.h>
  50 #include <net/arp.h>
  51
  52 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 static void ipoib_neigh_reclaim(struct rcu_head *rp);
  89
  90 static struct ib_client ipoib_client = {
  91         .name   = "ipoib",
  92         .add    = ipoib_add_one,
  93         .remove = ipoib_remove_one
  94 };
  95
  96 int ipoib_open(struct net_device *dev)
  97 {
  98         struct ipoib_dev_priv *priv = netdev_priv(dev);
  99
 100         ipoib_dbg(priv, "bringing up interface\n");
 101
 102         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 103
 104         if (ipoib_pkey_dev_delay_open(dev))
 105                 return 0;
 106
 107         if (ipoib_ib_dev_open(dev))
 108                 goto err_disable;
 109
 110         if (ipoib_ib_dev_up(dev))
 111                 goto err_stop;
 112
 113         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 114                 struct ipoib_dev_priv *cpriv;
 115
 116                 /* Bring up any child interfaces too */
 117                 mutex_lock(&priv->vlan_mutex);
 118                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 119                         int flags;
 120
 121                         flags = cpriv->dev->flags;
 122                         if (flags & IFF_UP)
 123                                 continue;
 124
 125                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 126                 }
 127                 mutex_unlock(&priv->vlan_mutex);
 128         }
 129
 130         netif_start_queue(dev);
 131
 132         return 0;
 133
 134 err_stop:
 135         ipoib_ib_dev_stop(dev, 1);
 136
 137 err_disable:
 138         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 139
 140         return -EINVAL;
 141 }
 142
 143 static int ipoib_stop(struct net_device *dev)
 144 {
 145         struct ipoib_dev_priv *priv = netdev_priv(dev);
 146
 147         ipoib_dbg(priv, "stopping interface\n");
 148
 149         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 150
 151         netif_stop_queue(dev);
 152
 153         ipoib_ib_dev_down(dev, 0);
 154         ipoib_ib_dev_stop(dev, 0);
 155
 156         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 157                 struct ipoib_dev_priv *cpriv;
 158
 159                 /* Bring down any child interfaces too */
 160                 mutex_lock(&priv->vlan_mutex);
 161                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 162                         int flags;
 163
 164                         flags = cpriv->dev->flags;
 165                         if (!(flags & IFF_UP))
 166                                 continue;
 167
 168                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 169                 }
 170                 mutex_unlock(&priv->vlan_mutex);
 171         }
 172
 173         return 0;
 174 }
 175
 176 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 177 {
 178         struct ipoib_dev_priv *priv = netdev_priv(dev);
 179
 180         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 181                 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
 182
 183         return features;
 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 sk_buff *skb;
 270
 271         while ((skb = __skb_dequeue(&path->queue)))
 272                 dev_kfree_skb_irq(skb);
 273
 274         ipoib_dbg(netdev_priv(dev), "path_free\n");
 275
 276         /* remove all neigh connected to this path */
 277         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 278
 279         if (path->ah)
 280                 ipoib_put_ah(path->ah);
 281
 282         kfree(path);
 283 }
 284
 285 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 286
 287 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 288 {
 289         struct ipoib_path_iter *iter;
 290
 291         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 292         if (!iter)
 293                 return NULL;
 294
 295         iter->dev = dev;
 296         memset(iter->path.pathrec.dgid.raw, 0, 16);
 297
 298         if (ipoib_path_iter_next(iter)) {
 299                 kfree(iter);
 300                 return NULL;
 301         }
 302
 303         return iter;
 304 }
 305
 306 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 307 {
 308         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 309         struct rb_node *n;
 310         struct ipoib_path *path;
 311         int ret = 1;
 312
 313         spin_lock_irq(&priv->lock);
 314
 315         n = rb_first(&priv->path_tree);
 316
 317         while (n) {
 318                 path = rb_entry(n, struct ipoib_path, rb_node);
 319
 320                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 321                            sizeof (union ib_gid)) < 0) {
 322                         iter->path = *path;
 323                         ret = 0;
 324                         break;
 325                 }
 326
 327                 n = rb_next(n);
 328         }
 329
 330         spin_unlock_irq(&priv->lock);
 331
 332         return ret;
 333 }
 334
 335 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 336                           struct ipoib_path *path)
 337 {
 338         *path = iter->path;
 339 }
 340
 341 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 342
 343 void ipoib_mark_paths_invalid(struct net_device *dev)
 344 {
 345         struct ipoib_dev_priv *priv = netdev_priv(dev);
 346         struct ipoib_path *path, *tp;
 347
 348         spin_lock_irq(&priv->lock);
 349
 350         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 351                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
 352                         be16_to_cpu(path->pathrec.dlid),
 353                         path->pathrec.dgid.raw);
 354                 path->valid =  0;
 355         }
 356
 357         spin_unlock_irq(&priv->lock);
 358 }
 359
 360 void ipoib_flush_paths(struct net_device *dev)
 361 {
 362         struct ipoib_dev_priv *priv = netdev_priv(dev);
 363         struct ipoib_path *path, *tp;
 364         LIST_HEAD(remove_list);
 365         unsigned long flags;
 366
 367         netif_tx_lock_bh(dev);
 368         spin_lock_irqsave(&priv->lock, flags);
 369
 370         list_splice_init(&priv->path_list, &remove_list);
 371
 372         list_for_each_entry(path, &remove_list, list)
 373                 rb_erase(&path->rb_node, &priv->path_tree);
 374
 375         list_for_each_entry_safe(path, tp, &remove_list, list) {
 376                 if (path->query)
 377                         ib_sa_cancel_query(path->query_id, path->query);
 378                 spin_unlock_irqrestore(&priv->lock, flags);
 379                 netif_tx_unlock_bh(dev);
 380                 wait_for_completion(&path->done);
 381                 path_free(dev, path);
 382                 netif_tx_lock_bh(dev);
 383                 spin_lock_irqsave(&priv->lock, flags);
 384         }
 385
 386         spin_unlock_irqrestore(&priv->lock, flags);
 387         netif_tx_unlock_bh(dev);
 388 }
 389
 390 static void path_rec_completion(int status,
 391                                 struct ib_sa_path_rec *pathrec,
 392                                 void *path_ptr)
 393 {
 394         struct ipoib_path *path = path_ptr;
 395         struct net_device *dev = path->dev;
 396         struct ipoib_dev_priv *priv = netdev_priv(dev);
 397         struct ipoib_ah *ah = NULL;
 398         struct ipoib_ah *old_ah = NULL;
 399         struct ipoib_neigh *neigh, *tn;
 400         struct sk_buff_head skqueue;
 401         struct sk_buff *skb;
 402         unsigned long flags;
 403
 404         if (!status)
 405                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 406                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
 407         else
 408                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 409                           status, path->pathrec.dgid.raw);
 410
 411         skb_queue_head_init(&skqueue);
 412
 413         if (!status) {
 414                 struct ib_ah_attr av;
 415
 416                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 417                         ah = ipoib_create_ah(dev, priv->pd, &av);
 418         }
 419
 420         spin_lock_irqsave(&priv->lock, flags);
 421
 422         if (!IS_ERR_OR_NULL(ah)) {
 423                 path->pathrec = *pathrec;
 424
 425                 old_ah   = path->ah;
 426                 path->ah = ah;
 427
 428                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 429                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 430
 431                 while ((skb = __skb_dequeue(&path->queue)))
 432                         __skb_queue_tail(&skqueue, skb);
 433
 434                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 435                         if (neigh->ah) {
 436                                 WARN_ON(neigh->ah != old_ah);
 437                                 /*
 438                                  * Dropping the ah reference inside
 439                                  * priv->lock is safe here, because we
 440                                  * will hold one more reference from
 441                                  * the original value of path->ah (ie
 442                                  * old_ah).
 443                                  */
 444                                 ipoib_put_ah(neigh->ah);
 445                         }
 446                         kref_get(&path->ah->ref);
 447                         neigh->ah = path->ah;
 448
 449                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 450                                 if (!ipoib_cm_get(neigh))
 451                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 452                                                                                path,
 453                                                                                neigh));
 454                                 if (!ipoib_cm_get(neigh)) {
 455                                         list_del(&neigh->list);
 456                                         ipoib_neigh_free(neigh);
 457                                         continue;
 458                                 }
 459                         }
 460
 461                         while ((skb = __skb_dequeue(&neigh->queue)))
 462                                 __skb_queue_tail(&skqueue, skb);
 463                 }
 464                 path->valid = 1;
 465         }
 466
 467         path->query = NULL;
 468         complete(&path->done);
 469
 470         spin_unlock_irqrestore(&priv->lock, flags);
 471
 472         if (old_ah)
 473                 ipoib_put_ah(old_ah);
 474
 475         while ((skb = __skb_dequeue(&skqueue))) {
 476                 skb->dev = dev;
 477                 if (dev_queue_xmit(skb))
 478                         ipoib_warn(priv, "dev_queue_xmit failed "
 479                                    "to requeue packet\n");
 480         }
 481 }
 482
 483 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 484 {
 485         struct ipoib_dev_priv *priv = netdev_priv(dev);
 486         struct ipoib_path *path;
 487
 488         if (!priv->broadcast)
 489                 return NULL;
 490
 491         path = kzalloc(sizeof *path, GFP_ATOMIC);
 492         if (!path)
 493                 return NULL;
 494
 495         path->dev = dev;
 496
 497         skb_queue_head_init(&path->queue);
 498
 499         INIT_LIST_HEAD(&path->neigh_list);
 500
 501         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 502         path->pathrec.sgid          = priv->local_gid;
 503         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 504         path->pathrec.numb_path     = 1;
 505         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 506
 507         return path;
 508 }
 509
 510 static int path_rec_start(struct net_device *dev,
 511                           struct ipoib_path *path)
 512 {
 513         struct ipoib_dev_priv *priv = netdev_priv(dev);
 514
 515         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 516                   path->pathrec.dgid.raw);
 517
 518         init_completion(&path->done);
 519
 520         path->query_id =
 521                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 522                                    &path->pathrec,
 523                                    IB_SA_PATH_REC_DGID          |
 524                                    IB_SA_PATH_REC_SGID          |
 525                                    IB_SA_PATH_REC_NUMB_PATH     |
 526                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 527                                    IB_SA_PATH_REC_PKEY,
 528                                    1000, GFP_ATOMIC,
 529                                    path_rec_completion,
 530                                    path, &path->query);
 531         if (path->query_id < 0) {
 532                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 533                 path->query = NULL;
 534                 complete(&path->done);
 535                 return path->query_id;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
 542                            struct net_device *dev)
 543 {
 544         struct ipoib_dev_priv *priv = netdev_priv(dev);
 545         struct ipoib_path *path;
 546         struct ipoib_neigh *neigh;
 547         unsigned long flags;
 548
 549         spin_lock_irqsave(&priv->lock, flags);
 550         neigh = ipoib_neigh_alloc(daddr, dev);
 551         if (!neigh) {
 552                 spin_unlock_irqrestore(&priv->lock, flags);
 553                 ++dev->stats.tx_dropped;
 554                 dev_kfree_skb_any(skb);
 555                 return;
 556         }
 557
 558         path = __path_find(dev, daddr + 4);
 559         if (!path) {
 560                 path = path_rec_create(dev, daddr + 4);
 561                 if (!path)
 562                         goto err_path;
 563
 564                 __path_add(dev, path);
 565         }
 566
 567         list_add_tail(&neigh->list, &path->neigh_list);
 568
 569         if (path->ah) {
 570                 kref_get(&path->ah->ref);
 571                 neigh->ah = path->ah;
 572
 573                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 574                         if (!ipoib_cm_get(neigh))
 575                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 576                         if (!ipoib_cm_get(neigh)) {
 577                                 list_del(&neigh->list);
 578                                 ipoib_neigh_free(neigh);
 579                                 goto err_drop;
 580                         }
 581                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 582                                 __skb_queue_tail(&neigh->queue, skb);
 583                         else {
 584                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 585                                            skb_queue_len(&neigh->queue));
 586                                 goto err_drop;
 587                         }
 588                 } else {
 589                         spin_unlock_irqrestore(&priv->lock, flags);
 590                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
 591                         ipoib_neigh_put(neigh);
 592                         return;
 593                 }
 594         } else {
 595                 neigh->ah  = NULL;
 596
 597                 if (!path->query && path_rec_start(dev, path))
 598                         goto err_list;
 599
 600                 __skb_queue_tail(&neigh->queue, skb);
 601         }
 602
 603         spin_unlock_irqrestore(&priv->lock, flags);
 604         ipoib_neigh_put(neigh);
 605         return;
 606
 607 err_list:
 608         list_del(&neigh->list);
 609
 610 err_path:
 611         ipoib_neigh_free(neigh);
 612 err_drop:
 613         ++dev->stats.tx_dropped;
 614         dev_kfree_skb_any(skb);
 615
 616         spin_unlock_irqrestore(&priv->lock, flags);
 617         ipoib_neigh_put(neigh);
 618 }
 619
 620 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 621                              struct ipoib_cb *cb)
 622 {
 623         struct ipoib_dev_priv *priv = netdev_priv(dev);
 624         struct ipoib_path *path;
 625         unsigned long flags;
 626
 627         spin_lock_irqsave(&priv->lock, flags);
 628
 629         path = __path_find(dev, cb->hwaddr + 4);
 630         if (!path || !path->valid) {
 631                 int new_path = 0;
 632
 633                 if (!path) {
 634                         path = path_rec_create(dev, cb->hwaddr + 4);
 635                         new_path = 1;
 636                 }
 637                 if (path) {
 638                         __skb_queue_tail(&path->queue, skb);
 639
 640                         if (!path->query && path_rec_start(dev, path)) {
 641                                 spin_unlock_irqrestore(&priv->lock, flags);
 642                                 if (new_path)
 643                                         path_free(dev, path);
 644                                 return;
 645                         } else
 646                                 __path_add(dev, path);
 647                 } else {
 648                         ++dev->stats.tx_dropped;
 649                         dev_kfree_skb_any(skb);
 650                 }
 651
 652                 spin_unlock_irqrestore(&priv->lock, flags);
 653                 return;
 654         }
 655
 656         if (path->ah) {
 657                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 658                           be16_to_cpu(path->pathrec.dlid));
 659
 660                 spin_unlock_irqrestore(&priv->lock, flags);
 661                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
 662                 return;
 663         } else if ((path->query || !path_rec_start(dev, path)) &&
 664                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 665                 __skb_queue_tail(&path->queue, skb);
 666         } else {
 667                 ++dev->stats.tx_dropped;
 668                 dev_kfree_skb_any(skb);
 669         }
 670
 671         spin_unlock_irqrestore(&priv->lock, flags);
 672 }
 673
 674 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 675 {
 676         struct ipoib_dev_priv *priv = netdev_priv(dev);
 677         struct ipoib_neigh *neigh;
 678         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 679         struct ipoib_header *header;
 680         unsigned long flags;
 681
 682         header = (struct ipoib_header *) skb->data;
 683
 684         if (unlikely(cb->hwaddr[4] == 0xff)) {
 685                 /* multicast, arrange "if" according to probability */
 686                 if ((header->proto != htons(ETH_P_IP)) &&
 687                     (header->proto != htons(ETH_P_IPV6)) &&
 688                     (header->proto != htons(ETH_P_ARP)) &&
 689                     (header->proto != htons(ETH_P_RARP))) {
 690                         /* ethertype not supported by IPoIB */
 691                         ++dev->stats.tx_dropped;
 692                         dev_kfree_skb_any(skb);
 693                         return NETDEV_TX_OK;
 694                 }
 695                 /* Add in the P_Key for multicast*/
 696                 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
 697                 cb->hwaddr[9] = priv->pkey & 0xff;
 698
 699                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
 700                 if (likely(neigh))
 701                         goto send_using_neigh;
 702                 ipoib_mcast_send(dev, cb->hwaddr, skb);
 703                 return NETDEV_TX_OK;
 704         }
 705
 706         /* unicast, arrange "switch" according to probability */
 707         switch (header->proto) {
 708         case htons(ETH_P_IP):
 709         case htons(ETH_P_IPV6):
 710                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
 711                 if (unlikely(!neigh)) {
 712                         neigh_add_path(skb, cb->hwaddr, dev);
 713                         return NETDEV_TX_OK;
 714                 }
 715                 break;
 716         case htons(ETH_P_ARP):
 717         case htons(ETH_P_RARP):
 718                 /* for unicast ARP and RARP should always perform path find */
 719                 unicast_arp_send(skb, dev, cb);
 720                 return NETDEV_TX_OK;
 721         default:
 722                 /* ethertype not supported by IPoIB */
 723                 ++dev->stats.tx_dropped;
 724                 dev_kfree_skb_any(skb);
 725                 return NETDEV_TX_OK;
 726         }
 727
 728 send_using_neigh:
 729         /* note we now hold a ref to neigh */
 730         if (ipoib_cm_get(neigh)) {
 731                 if (ipoib_cm_up(neigh)) {
 732                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
 733                         goto unref;
 734                 }
 735         } else if (neigh->ah) {
 736                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
 737                 goto unref;
 738         }
 739
 740         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 741                 spin_lock_irqsave(&priv->lock, flags);
 742                 __skb_queue_tail(&neigh->queue, skb);
 743                 spin_unlock_irqrestore(&priv->lock, flags);
 744         } else {
 745                 ++dev->stats.tx_dropped;
 746                 dev_kfree_skb_any(skb);
 747         }
 748
 749 unref:
 750         ipoib_neigh_put(neigh);
 751
 752         return NETDEV_TX_OK;
 753 }
 754
 755 static void ipoib_timeout(struct net_device *dev)
 756 {
 757         struct ipoib_dev_priv *priv = netdev_priv(dev);
 758
 759         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
 760                    jiffies_to_msecs(jiffies - dev->trans_start));
 761         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
 762                    netif_queue_stopped(dev),
 763                    priv->tx_head, priv->tx_tail);
 764         /* XXX reset QP, etc. */
 765 }
 766
 767 static int ipoib_hard_header(struct sk_buff *skb,
 768                              struct net_device *dev,
 769                              unsigned short type,
 770                              const void *daddr, const void *saddr, unsigned len)
 771 {
 772         struct ipoib_header *header;
 773         struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
 774
 775         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
 776
 777         header->proto = htons(type);
 778         header->reserved = 0;
 779
 780         /*
 781          * we don't rely on dst_entry structure,  always stuff the
 782          * destination address into skb->cb so we can figure out where
 783          * to send the packet later.
 784          */
 785         memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
 786
 787         return 0;
 788 }
 789
 790 static void ipoib_set_mcast_list(struct net_device *dev)
 791 {
 792         struct ipoib_dev_priv *priv = netdev_priv(dev);
 793
 794         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 795                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
 796                 return;
 797         }
 798
 799         queue_work(ipoib_workqueue, &priv->restart_task);
 800 }
 801
 802 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
 803 {
 804         /*
 805          * Use only the address parts that contributes to spreading
 806          * The subnet prefix is not used as one can not connect to
 807          * same remote port (GUID) using the same remote QPN via two
 808          * different subnets.
 809          */
 810          /* qpn octets[1:4) & port GUID octets[12:20) */
 811         u32 *daddr_32 = (u32 *) daddr;
 812         u32 hv;
 813
 814         hv = jhash_3words(daddr_32[3], daddr_32[4], 0xFFFFFF & daddr_32[0], 0);
 815         return hv & htbl->mask;
 816 }
 817
 818 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
 819 {
 820         struct ipoib_dev_priv *priv = netdev_priv(dev);
 821         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 822         struct ipoib_neigh_hash *htbl;
 823         struct ipoib_neigh *neigh = NULL;
 824         u32 hash_val;
 825
 826         rcu_read_lock_bh();
 827
 828         htbl = rcu_dereference_bh(ntbl->htbl);
 829
 830         if (!htbl)
 831                 goto out_unlock;
 832
 833         hash_val = ipoib_addr_hash(htbl, daddr);
 834         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
 835              neigh != NULL;
 836              neigh = rcu_dereference_bh(neigh->hnext)) {
 837                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
 838                         /* found, take one ref on behalf of the caller */
 839                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
 840                                 /* deleted */
 841                                 neigh = NULL;
 842                                 goto out_unlock;
 843                         }
 844                         neigh->alive = jiffies;
 845                         goto out_unlock;
 846                 }
 847         }
 848
 849 out_unlock:
 850         rcu_read_unlock_bh();
 851         return neigh;
 852 }
 853
 854 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
 855 {
 856         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 857         struct ipoib_neigh_hash *htbl;
 858         unsigned long neigh_obsolete;
 859         unsigned long dt;
 860         unsigned long flags;
 861         int i;
 862
 863         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 864                 return;
 865
 866         spin_lock_irqsave(&priv->lock, flags);
 867
 868         htbl = rcu_dereference_protected(ntbl->htbl,
 869                                          lockdep_is_held(&priv->lock));
 870
 871         if (!htbl)
 872                 goto out_unlock;
 873
 874         /* neigh is obsolete if it was idle for two GC periods */
 875         dt = 2 * arp_tbl.gc_interval;
 876         neigh_obsolete = jiffies - dt;
 877         /* handle possible race condition */
 878         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 879                 goto out_unlock;
 880
 881         for (i = 0; i < htbl->size; i++) {
 882                 struct ipoib_neigh *neigh;
 883                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
 884
 885                 while ((neigh = rcu_dereference_protected(*np,
 886                                                           lockdep_is_held(&priv->lock))) != NULL) {
 887                         /* was the neigh idle for two GC periods */
 888                         if (time_after(neigh_obsolete, neigh->alive)) {
 889                                 rcu_assign_pointer(*np,
 890                                                    rcu_dereference_protected(neigh->hnext,
 891                                                                              lockdep_is_held(&priv->lock)));
 892                                 /* remove from path/mc list */
 893                                 list_del(&neigh->list);
 894                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
 895                         } else {
 896                                 np = &neigh->hnext;
 897                         }
 898
 899                 }
 900         }
 901
 902 out_unlock:
 903         spin_unlock_irqrestore(&priv->lock, flags);
 904 }
 905
 906 static void ipoib_reap_neigh(struct work_struct *work)
 907 {
 908         struct ipoib_dev_priv *priv =
 909                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
 910
 911         __ipoib_reap_neigh(priv);
 912
 913         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
 914                 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
 915                                    arp_tbl.gc_interval);
 916 }
 917
 918
 919 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
 920                                       struct net_device *dev)
 921 {
 922         struct ipoib_neigh *neigh;
 923
 924         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
 925         if (!neigh)
 926                 return NULL;
 927
 928         neigh->dev = dev;
 929         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
 930         skb_queue_head_init(&neigh->queue);
 931         INIT_LIST_HEAD(&neigh->list);
 932         ipoib_cm_set(neigh, NULL);
 933         /* one ref on behalf of the caller */
 934         atomic_set(&neigh->refcnt, 1);
 935
 936         return neigh;
 937 }
 938
 939 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
 940                                       struct net_device *dev)
 941 {
 942         struct ipoib_dev_priv *priv = netdev_priv(dev);
 943         struct ipoib_neigh_table *ntbl = &priv->ntbl;
 944         struct ipoib_neigh_hash *htbl;
 945         struct ipoib_neigh *neigh;
 946         u32 hash_val;
 947
 948         htbl = rcu_dereference_protected(ntbl->htbl,
 949                                          lockdep_is_held(&priv->lock));
 950         if (!htbl) {
 951                 neigh = NULL;
 952                 goto out_unlock;
 953         }
 954
 955         /* need to add a new neigh, but maybe some other thread succeeded?
 956          * recalc hash, maybe hash resize took place so we do a search
 957          */
 958         hash_val = ipoib_addr_hash(htbl, daddr);
 959         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
 960                                                lockdep_is_held(&priv->lock));
 961              neigh != NULL;
 962              neigh = rcu_dereference_protected(neigh->hnext,
 963                                                lockdep_is_held(&priv->lock))) {
 964                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
 965                         /* found, take one ref on behalf of the caller */
 966                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
 967                                 /* deleted */
 968                                 neigh = NULL;
 969                                 break;
 970                         }
 971                         neigh->alive = jiffies;
 972                         goto out_unlock;
 973                 }
 974         }
 975
 976         neigh = ipoib_neigh_ctor(daddr, dev);
 977         if (!neigh)
 978                 goto out_unlock;
 979
 980         /* one ref on behalf of the hash table */
 981         atomic_inc(&neigh->refcnt);
 982         neigh->alive = jiffies;
 983         /* put in hash */
 984         rcu_assign_pointer(neigh->hnext,
 985                            rcu_dereference_protected(htbl->buckets[hash_val],
 986                                                      lockdep_is_held(&priv->lock)));
 987         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
 988         atomic_inc(&ntbl->entries);
 989
 990 out_unlock:
 991
 992         return neigh;
 993 }
 994
 995 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
 996 {
 997         /* neigh reference count was dropprd to zero */
 998         struct net_device *dev = neigh->dev;
 999         struct ipoib_dev_priv *priv = netdev_priv(dev);
1000         struct sk_buff *skb;
1001         if (neigh->ah)
1002                 ipoib_put_ah(neigh->ah);
1003         while ((skb = __skb_dequeue(&neigh->queue))) {
1004                 ++dev->stats.tx_dropped;
1005                 dev_kfree_skb_any(skb);
1006         }
1007         if (ipoib_cm_get(neigh))
1008                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1009         ipoib_dbg(netdev_priv(dev),
1010                   "neigh free for %06x %pI6\n",
1011                   IPOIB_QPN(neigh->daddr),
1012                   neigh->daddr + 4);
1013         kfree(neigh);
1014         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1015                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1016                         complete(&priv->ntbl.flushed);
1017         }
1018 }
1019
1020 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1021 {
1022         /* Called as a result of removal from hash table */
1023         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1024         /* note TX context may hold another ref */
1025         ipoib_neigh_put(neigh);
1026 }
1027
1028 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1029 {
1030         struct net_device *dev = neigh->dev;
1031         struct ipoib_dev_priv *priv = netdev_priv(dev);
1032         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1033         struct ipoib_neigh_hash *htbl;
1034         struct ipoib_neigh __rcu **np;
1035         struct ipoib_neigh *n;
1036         u32 hash_val;
1037
1038         htbl = rcu_dereference_protected(ntbl->htbl,
1039                                         lockdep_is_held(&priv->lock));
1040         if (!htbl)
1041                 return;
1042
1043         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1044         np = &htbl->buckets[hash_val];
1045         for (n = rcu_dereference_protected(*np,
1046                                             lockdep_is_held(&priv->lock));
1047              n != NULL;
1048              n = rcu_dereference_protected(*np,
1049                                         lockdep_is_held(&priv->lock))) {
1050                 if (n == neigh) {
1051                         /* found */
1052                         rcu_assign_pointer(*np,
1053                                            rcu_dereference_protected(neigh->hnext,
1054                                                                      lockdep_is_held(&priv->lock)));
1055                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1056                         return;
1057                 } else {
1058                         np = &n->hnext;
1059                 }
1060         }
1061 }
1062
1063 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1064 {
1065         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1066         struct ipoib_neigh_hash *htbl;
1067         struct ipoib_neigh **buckets;
1068         u32 size;
1069
1070         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1071         ntbl->htbl = NULL;
1072         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1073         if (!htbl)
1074                 return -ENOMEM;
1075         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1076         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1077         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1078         if (!buckets) {
1079                 kfree(htbl);
1080                 return -ENOMEM;
1081         }
1082         htbl->size = size;
1083         htbl->mask = (size - 1);
1084         htbl->buckets = buckets;
1085         ntbl->htbl = htbl;
1086         htbl->ntbl = ntbl;
1087         atomic_set(&ntbl->entries, 0);
1088
1089         /* start garbage collection */
1090         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1091         queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1092                            arp_tbl.gc_interval);
1093
1094         return 0;
1095 }
1096
1097 static void neigh_hash_free_rcu(struct rcu_head *head)
1098 {
1099         struct ipoib_neigh_hash *htbl = container_of(head,
1100                                                     struct ipoib_neigh_hash,
1101                                                     rcu);
1102         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1103         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1104
1105         kfree(buckets);
1106         kfree(htbl);
1107         complete(&ntbl->deleted);
1108 }
1109
1110 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1111 {
1112         struct ipoib_dev_priv *priv = netdev_priv(dev);
1113         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1114         struct ipoib_neigh_hash *htbl;
1115         unsigned long flags;
1116         int i;
1117
1118         /* remove all neigh connected to a given path or mcast */
1119         spin_lock_irqsave(&priv->lock, flags);
1120
1121         htbl = rcu_dereference_protected(ntbl->htbl,
1122                                          lockdep_is_held(&priv->lock));
1123
1124         if (!htbl)
1125                 goto out_unlock;
1126
1127         for (i = 0; i < htbl->size; i++) {
1128                 struct ipoib_neigh *neigh;
1129                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1130
1131                 while ((neigh = rcu_dereference_protected(*np,
1132                                                           lockdep_is_held(&priv->lock))) != NULL) {
1133                         /* delete neighs belong to this parent */
1134                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1135                                 rcu_assign_pointer(*np,
1136                                                    rcu_dereference_protected(neigh->hnext,
1137                                                                              lockdep_is_held(&priv->lock)));
1138                                 /* remove from parent list */
1139                                 list_del(&neigh->list);
1140                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1141                         } else {
1142                                 np = &neigh->hnext;
1143                         }
1144
1145                 }
1146         }
1147 out_unlock:
1148         spin_unlock_irqrestore(&priv->lock, flags);
1149 }
1150
1151 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1152 {
1153         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1154         struct ipoib_neigh_hash *htbl;
1155         unsigned long flags;
1156         int i, wait_flushed = 0;
1157
1158         init_completion(&priv->ntbl.flushed);
1159
1160         spin_lock_irqsave(&priv->lock, flags);
1161
1162         htbl = rcu_dereference_protected(ntbl->htbl,
1163                                         lockdep_is_held(&priv->lock));
1164         if (!htbl)
1165                 goto out_unlock;
1166
1167         wait_flushed = atomic_read(&priv->ntbl.entries);
1168         if (!wait_flushed)
1169                 goto free_htbl;
1170
1171         for (i = 0; i < htbl->size; i++) {
1172                 struct ipoib_neigh *neigh;
1173                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1174
1175                 while ((neigh = rcu_dereference_protected(*np,
1176                                        lockdep_is_held(&priv->lock))) != NULL) {
1177                         rcu_assign_pointer(*np,
1178                                            rcu_dereference_protected(neigh->hnext,
1179                                                                      lockdep_is_held(&priv->lock)));
1180                         /* remove from path/mc list */
1181                         list_del(&neigh->list);
1182                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1183                 }
1184         }
1185
1186 free_htbl:
1187         rcu_assign_pointer(ntbl->htbl, NULL);
1188         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1189
1190 out_unlock:
1191         spin_unlock_irqrestore(&priv->lock, flags);
1192         if (wait_flushed)
1193                 wait_for_completion(&priv->ntbl.flushed);
1194 }
1195
1196 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1197 {
1198         struct ipoib_dev_priv *priv = netdev_priv(dev);
1199         int stopped;
1200
1201         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1202         init_completion(&priv->ntbl.deleted);
1203         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1204
1205         /* Stop GC if called at init fail need to cancel work */
1206         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1207         if (!stopped)
1208                 cancel_delayed_work(&priv->neigh_reap_task);
1209
1210         ipoib_flush_neighs(priv);
1211
1212         wait_for_completion(&priv->ntbl.deleted);
1213 }
1214
1215
1216 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1217 {
1218         struct ipoib_dev_priv *priv = netdev_priv(dev);
1219
1220         if (ipoib_neigh_hash_init(priv) < 0)
1221                 goto out;
1222         /* Allocate RX/TX "rings" to hold queued skbs */
1223         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1224                                 GFP_KERNEL);
1225         if (!priv->rx_ring) {
1226                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1227                        ca->name, ipoib_recvq_size);
1228                 goto out_neigh_hash_cleanup;
1229         }
1230
1231         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1232         if (!priv->tx_ring) {
1233                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1234                        ca->name, ipoib_sendq_size);
1235                 goto out_rx_ring_cleanup;
1236         }
1237
1238         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1239
1240         if (ipoib_ib_dev_init(dev, ca, port))
1241                 goto out_tx_ring_cleanup;
1242
1243         return 0;
1244
1245 out_tx_ring_cleanup:
1246         vfree(priv->tx_ring);
1247
1248 out_rx_ring_cleanup:
1249         kfree(priv->rx_ring);
1250
1251 out_neigh_hash_cleanup:
1252         ipoib_neigh_hash_uninit(dev);
1253 out:
1254         return -ENOMEM;
1255 }
1256
1257 void ipoib_dev_cleanup(struct net_device *dev)
1258 {
1259         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1260
1261         ipoib_delete_debug_files(dev);
1262
1263         /* Delete any child interfaces first */
1264         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1265                 /* Stop GC on child */
1266                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1267                 cancel_delayed_work(&cpriv->neigh_reap_task);
1268                 unregister_netdev(cpriv->dev);
1269                 ipoib_dev_cleanup(cpriv->dev);
1270                 free_netdev(cpriv->dev);
1271         }
1272
1273         ipoib_ib_dev_cleanup(dev);
1274
1275         kfree(priv->rx_ring);
1276         vfree(priv->tx_ring);
1277
1278         priv->rx_ring = NULL;
1279         priv->tx_ring = NULL;
1280
1281         ipoib_neigh_hash_uninit(dev);
1282 }
1283
1284 static const struct header_ops ipoib_header_ops = {
1285         .create = ipoib_hard_header,
1286 };
1287
1288 static const struct net_device_ops ipoib_netdev_ops = {
1289         .ndo_open                = ipoib_open,
1290         .ndo_stop                = ipoib_stop,
1291         .ndo_change_mtu          = ipoib_change_mtu,
1292         .ndo_fix_features        = ipoib_fix_features,
1293         .ndo_start_xmit          = ipoib_start_xmit,
1294         .ndo_tx_timeout          = ipoib_timeout,
1295         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1296 };
1297
1298 static void ipoib_setup(struct net_device *dev)
1299 {
1300         struct ipoib_dev_priv *priv = netdev_priv(dev);
1301
1302         dev->netdev_ops          = &ipoib_netdev_ops;
1303         dev->header_ops          = &ipoib_header_ops;
1304
1305         ipoib_set_ethtool_ops(dev);
1306
1307         netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1308
1309         dev->watchdog_timeo      = HZ;
1310
1311         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1312
1313         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1314         dev->addr_len            = INFINIBAND_ALEN;
1315         dev->type                = ARPHRD_INFINIBAND;
1316         dev->tx_queue_len        = ipoib_sendq_size * 2;
1317         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1318                                     NETIF_F_HIGHDMA);
1319         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
1320
1321         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1322
1323         netif_carrier_off(dev);
1324
1325         priv->dev = dev;
1326
1327         spin_lock_init(&priv->lock);
1328
1329         mutex_init(&priv->vlan_mutex);
1330
1331         INIT_LIST_HEAD(&priv->path_list);
1332         INIT_LIST_HEAD(&priv->child_intfs);
1333         INIT_LIST_HEAD(&priv->dead_ahs);
1334         INIT_LIST_HEAD(&priv->multicast_list);
1335
1336         INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1337         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1338         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1339         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1340         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1341         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1342         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1343         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1344         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1345 }
1346
1347 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1348 {
1349         struct net_device *dev;
1350
1351         dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1352                            ipoib_setup);
1353         if (!dev)
1354                 return NULL;
1355
1356         return netdev_priv(dev);
1357 }
1358
1359 static ssize_t show_pkey(struct device *dev,
1360                          struct device_attribute *attr, char *buf)
1361 {
1362         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1363
1364         return sprintf(buf, "0x%04x\n", priv->pkey);
1365 }
1366 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1367
1368 static ssize_t show_umcast(struct device *dev,
1369                            struct device_attribute *attr, char *buf)
1370 {
1371         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1372
1373         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1374 }
1375
1376 static ssize_t set_umcast(struct device *dev,
1377                           struct device_attribute *attr,
1378                           const char *buf, size_t count)
1379 {
1380         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1381         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1382
1383         if (umcast_val > 0) {
1384                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1385                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1386                                 "by userspace\n");
1387         } else
1388                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1389
1390         return count;
1391 }
1392 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1393
1394 int ipoib_add_umcast_attr(struct net_device *dev)
1395 {
1396         return device_create_file(&dev->dev, &dev_attr_umcast);
1397 }
1398
1399 static ssize_t create_child(struct device *dev,
1400                             struct device_attribute *attr,
1401                             const char *buf, size_t count)
1402 {
1403         int pkey;
1404         int ret;
1405
1406         if (sscanf(buf, "%i", &pkey) != 1)
1407                 return -EINVAL;
1408
1409         if (pkey < 0 || pkey > 0xffff)
1410                 return -EINVAL;
1411
1412         /*
1413          * Set the full membership bit, so that we join the right
1414          * broadcast group, etc.
1415          */
1416         pkey |= 0x8000;
1417
1418         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1419
1420         return ret ? ret : count;
1421 }
1422 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1423
1424 static ssize_t delete_child(struct device *dev,
1425                             struct device_attribute *attr,
1426                             const char *buf, size_t count)
1427 {
1428         int pkey;
1429         int ret;
1430
1431         if (sscanf(buf, "%i", &pkey) != 1)
1432                 return -EINVAL;
1433
1434         if (pkey < 0 || pkey > 0xffff)
1435                 return -EINVAL;
1436
1437         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1438
1439         return ret ? ret : count;
1440
1441 }
1442 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1443
1444 int ipoib_add_pkey_attr(struct net_device *dev)
1445 {
1446         return device_create_file(&dev->dev, &dev_attr_pkey);
1447 }
1448
1449 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1450 {
1451         struct ib_device_attr *device_attr;
1452         int result = -ENOMEM;
1453
1454         device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1455         if (!device_attr) {
1456                 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1457                        hca->name, sizeof *device_attr);
1458                 return result;
1459         }
1460
1461         result = ib_query_device(hca, device_attr);
1462         if (result) {
1463                 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1464                        hca->name, result);
1465                 kfree(device_attr);
1466                 return result;
1467         }
1468         priv->hca_caps = device_attr->device_cap_flags;
1469
1470         kfree(device_attr);
1471
1472         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1473                 priv->dev->hw_features = NETIF_F_SG |
1474                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1475
1476                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1477                         priv->dev->hw_features |= NETIF_F_TSO;
1478
1479                 priv->dev->features |= priv->dev->hw_features;
1480         }
1481
1482         return 0;
1483 }
1484
1485 static struct net_device *ipoib_add_port(const char *format,
1486                                          struct ib_device *hca, u8 port)
1487 {
1488         struct ipoib_dev_priv *priv;
1489         struct ib_port_attr attr;
1490         int result = -ENOMEM;
1491
1492         priv = ipoib_intf_alloc(format);
1493         if (!priv)
1494                 goto alloc_mem_failed;
1495
1496         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1497         priv->dev->dev_id = port - 1;
1498
1499         if (!ib_query_port(hca, port, &attr))
1500                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1501         else {
1502                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1503                        hca->name, port);
1504                 goto device_init_failed;
1505         }
1506
1507         /* MTU will be reset when mcast join happens */
1508         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
1509         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
1510
1511         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1512
1513         result = ib_query_pkey(hca, port, 0, &priv->pkey);
1514         if (result) {
1515                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1516                        hca->name, port, result);
1517                 goto device_init_failed;
1518         }
1519
1520         if (ipoib_set_dev_features(priv, hca))
1521                 goto device_init_failed;
1522
1523         /*
1524          * Set the full membership bit, so that we join the right
1525          * broadcast group, etc.
1526          */
1527         priv->pkey |= 0x8000;
1528
1529         priv->dev->broadcast[8] = priv->pkey >> 8;
1530         priv->dev->broadcast[9] = priv->pkey & 0xff;
1531
1532         result = ib_query_gid(hca, port, 0, &priv->local_gid);
1533         if (result) {
1534                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1535                        hca->name, port, result);
1536                 goto device_init_failed;
1537         } else
1538                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1539
1540         result = ipoib_dev_init(priv->dev, hca, port);
1541         if (result < 0) {
1542                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1543                        hca->name, port, result);
1544                 goto device_init_failed;
1545         }
1546
1547         INIT_IB_EVENT_HANDLER(&priv->event_handler,
1548                               priv->ca, ipoib_event);
1549         result = ib_register_event_handler(&priv->event_handler);
1550         if (result < 0) {
1551                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1552                        "port %d (ret = %d)\n",
1553                        hca->name, port, result);
1554                 goto event_failed;
1555         }
1556
1557         result = register_netdev(priv->dev);
1558         if (result) {
1559                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1560                        hca->name, port, result);
1561                 goto register_failed;
1562         }
1563
1564         ipoib_create_debug_files(priv->dev);
1565
1566         if (ipoib_cm_add_mode_attr(priv->dev))
1567                 goto sysfs_failed;
1568         if (ipoib_add_pkey_attr(priv->dev))
1569                 goto sysfs_failed;
1570         if (ipoib_add_umcast_attr(priv->dev))
1571                 goto sysfs_failed;
1572         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1573                 goto sysfs_failed;
1574         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1575                 goto sysfs_failed;
1576
1577         return priv->dev;
1578
1579 sysfs_failed:
1580         ipoib_delete_debug_files(priv->dev);
1581         unregister_netdev(priv->dev);
1582
1583 register_failed:
1584         ib_unregister_event_handler(&priv->event_handler);
1585         /* Stop GC if started before flush */
1586         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1587         cancel_delayed_work(&priv->neigh_reap_task);
1588         flush_workqueue(ipoib_workqueue);
1589
1590 event_failed:
1591         ipoib_dev_cleanup(priv->dev);
1592
1593 device_init_failed:
1594         free_netdev(priv->dev);
1595
1596 alloc_mem_failed:
1597         return ERR_PTR(result);
1598 }
1599
1600 static void ipoib_add_one(struct ib_device *device)
1601 {
1602         struct list_head *dev_list;
1603         struct net_device *dev;
1604         struct ipoib_dev_priv *priv;
1605         int s, e, p;
1606
1607         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1608                 return;
1609
1610         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1611         if (!dev_list)
1612                 return;
1613
1614         INIT_LIST_HEAD(dev_list);
1615
1616         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1617                 s = 0;
1618                 e = 0;
1619         } else {
1620                 s = 1;
1621                 e = device->phys_port_cnt;
1622         }
1623
1624         for (p = s; p <= e; ++p) {
1625                 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1626                         continue;
1627                 dev = ipoib_add_port("ib%d", device, p);
1628                 if (!IS_ERR(dev)) {
1629                         priv = netdev_priv(dev);
1630                         list_add_tail(&priv->list, dev_list);
1631                 }
1632         }
1633
1634         ib_set_client_data(device, &ipoib_client, dev_list);
1635 }
1636
1637 static void ipoib_remove_one(struct ib_device *device)
1638 {
1639         struct ipoib_dev_priv *priv, *tmp;
1640         struct list_head *dev_list;
1641
1642         if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1643                 return;
1644
1645         dev_list = ib_get_client_data(device, &ipoib_client);
1646
1647         list_for_each_entry_safe(priv, tmp, dev_list, list) {
1648                 ib_unregister_event_handler(&priv->event_handler);
1649
1650                 rtnl_lock();
1651                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1652                 rtnl_unlock();
1653
1654                 /* Stop GC */
1655                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1656                 cancel_delayed_work(&priv->neigh_reap_task);
1657                 flush_workqueue(ipoib_workqueue);
1658
1659                 unregister_netdev(priv->dev);
1660                 ipoib_dev_cleanup(priv->dev);
1661                 free_netdev(priv->dev);
1662         }
1663
1664         kfree(dev_list);
1665 }
1666
1667 static int __init ipoib_init_module(void)
1668 {
1669         int ret;
1670
1671         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1672         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1673         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1674
1675         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1676         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1677         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1678 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1679         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1680 #endif
1681
1682         /*
1683          * When copying small received packets, we only copy from the
1684          * linear data part of the SKB, so we rely on this condition.
1685          */
1686         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1687
1688         ret = ipoib_register_debugfs();
1689         if (ret)
1690                 return ret;
1691
1692         /*
1693          * We create our own workqueue mainly because we want to be
1694          * able to flush it when devices are being removed.  We can't
1695          * use schedule_work()/flush_scheduled_work() because both
1696          * unregister_netdev() and linkwatch_event take the rtnl lock,
1697          * so flush_scheduled_work() can deadlock during device
1698          * removal.
1699          */
1700         ipoib_workqueue = create_singlethread_workqueue("ipoib");
1701         if (!ipoib_workqueue) {
1702                 ret = -ENOMEM;
1703                 goto err_fs;
1704         }
1705
1706         ib_sa_register_client(&ipoib_sa_client);
1707
1708         ret = ib_register_client(&ipoib_client);
1709         if (ret)
1710                 goto err_sa;
1711
1712         return 0;
1713
1714 err_sa:
1715         ib_sa_unregister_client(&ipoib_sa_client);
1716         destroy_workqueue(ipoib_workqueue);
1717
1718 err_fs:
1719         ipoib_unregister_debugfs();
1720
1721         return ret;
1722 }
1723
1724 static void __exit ipoib_cleanup_module(void)
1725 {
1726         ib_unregister_client(&ipoib_client);
1727         ib_sa_unregister_client(&ipoib_sa_client);
1728         ipoib_unregister_debugfs();
1729         destroy_workqueue(ipoib_workqueue);
1730 }
1731
1732 module_init(ipoib_init_module);
1733 module_exit(ipoib_cleanup_module);