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 #include <net/addrconf.h>
  52 #include <linux/inetdevice.h>
  53 #include <rdma/ib_cache.h>
  54 #include <linux/pci.h>
  55
  56 #define DRV_VERSION "1.0.0"
  57
  58 const char ipoib_driver_version[] = DRV_VERSION;
  59
  60 MODULE_AUTHOR("Roland Dreier");
  61 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
  62 MODULE_LICENSE("Dual BSD/GPL");
  63 MODULE_VERSION(DRV_VERSION);
  64
  65 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
  66 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
  67
  68 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
  69 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
  70 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
  71 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
  72
  73 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  74 int ipoib_debug_level;
  75
  76 module_param_named(debug_level, ipoib_debug_level, int, 0644);
  77 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
  78 #endif
  79
  80 struct ipoib_path_iter {
  81         struct net_device *dev;
  82         struct ipoib_path  path;
  83 };
  84
  85 static const u8 ipv4_bcast_addr[] = {
  86         0x00, 0xff, 0xff, 0xff,
  87         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
  88         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
  89 };
  90
  91 struct workqueue_struct *ipoib_workqueue;
  92
  93 struct ib_sa_client ipoib_sa_client;
  94
  95 static void ipoib_add_one(struct ib_device *device);
  96 static void ipoib_remove_one(struct ib_device *device, void *client_data);
  97 static void ipoib_neigh_reclaim(struct rcu_head *rp);
  98 static struct net_device *ipoib_get_net_dev_by_params(
  99                 struct ib_device *dev, u8 port, u16 pkey,
 100                 const union ib_gid *gid, const struct sockaddr *addr,
 101                 void *client_data);
 102 static int ipoib_set_mac(struct net_device *dev, void *addr);
 103
 104 static struct ib_client ipoib_client = {
 105         .name   = "ipoib",
 106         .add    = ipoib_add_one,
 107         .remove = ipoib_remove_one,
 108         .get_net_dev_by_params = ipoib_get_net_dev_by_params,
 109 };
 110
 111 int ipoib_open(struct net_device *dev)
 112 {
 113         struct ipoib_dev_priv *priv = netdev_priv(dev);
 114
 115         ipoib_dbg(priv, "bringing up interface\n");
 116
 117         netif_carrier_off(dev);
 118
 119         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 120
 121         priv->sm_fullmember_sendonly_support = false;
 122
 123         if (ipoib_ib_dev_open(dev)) {
 124                 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 125                         return 0;
 126                 goto err_disable;
 127         }
 128
 129         if (ipoib_ib_dev_up(dev))
 130                 goto err_stop;
 131
 132         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 133                 struct ipoib_dev_priv *cpriv;
 134
 135                 /* Bring up any child interfaces too */
 136                 down_read(&priv->vlan_rwsem);
 137                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 138                         int flags;
 139
 140                         flags = cpriv->dev->flags;
 141                         if (flags & IFF_UP)
 142                                 continue;
 143
 144                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 145                 }
 146                 up_read(&priv->vlan_rwsem);
 147         }
 148
 149         netif_start_queue(dev);
 150
 151         return 0;
 152
 153 err_stop:
 154         ipoib_ib_dev_stop(dev);
 155
 156 err_disable:
 157         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 158
 159         return -EINVAL;
 160 }
 161
 162 static int ipoib_stop(struct net_device *dev)
 163 {
 164         struct ipoib_dev_priv *priv = netdev_priv(dev);
 165
 166         ipoib_dbg(priv, "stopping interface\n");
 167
 168         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 169
 170         netif_stop_queue(dev);
 171
 172         ipoib_ib_dev_down(dev);
 173         ipoib_ib_dev_stop(dev);
 174
 175         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 176                 struct ipoib_dev_priv *cpriv;
 177
 178                 /* Bring down any child interfaces too */
 179                 down_read(&priv->vlan_rwsem);
 180                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 181                         int flags;
 182
 183                         flags = cpriv->dev->flags;
 184                         if (!(flags & IFF_UP))
 185                                 continue;
 186
 187                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 188                 }
 189                 up_read(&priv->vlan_rwsem);
 190         }
 191
 192         return 0;
 193 }
 194
 195 static void ipoib_uninit(struct net_device *dev)
 196 {
 197         ipoib_dev_cleanup(dev);
 198 }
 199
 200 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 201 {
 202         struct ipoib_dev_priv *priv = netdev_priv(dev);
 203
 204         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 205                 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 206
 207         return features;
 208 }
 209
 210 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 211 {
 212         struct ipoib_dev_priv *priv = netdev_priv(dev);
 213
 214         /* dev->mtu > 2K ==> connected mode */
 215         if (ipoib_cm_admin_enabled(dev)) {
 216                 if (new_mtu > ipoib_cm_max_mtu(dev))
 217                         return -EINVAL;
 218
 219                 if (new_mtu > priv->mcast_mtu)
 220                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 221                                    priv->mcast_mtu);
 222
 223                 dev->mtu = new_mtu;
 224                 return 0;
 225         }
 226
 227         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 228                 return -EINVAL;
 229
 230         priv->admin_mtu = new_mtu;
 231
 232         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 233
 234         return 0;
 235 }
 236
 237 /* Called with an RCU read lock taken */
 238 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
 239                                         struct net_device *dev)
 240 {
 241         struct net *net = dev_net(dev);
 242         struct in_device *in_dev;
 243         struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
 244         struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
 245         __be32 ret_addr;
 246
 247         switch (addr->sa_family) {
 248         case AF_INET:
 249                 in_dev = in_dev_get(dev);
 250                 if (!in_dev)
 251                         return false;
 252
 253                 ret_addr = inet_confirm_addr(net, in_dev, 0,
 254                                              addr_in->sin_addr.s_addr,
 255                                              RT_SCOPE_HOST);
 256                 in_dev_put(in_dev);
 257                 if (ret_addr)
 258                         return true;
 259
 260                 break;
 261         case AF_INET6:
 262                 if (IS_ENABLED(CONFIG_IPV6) &&
 263                     ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
 264                         return true;
 265
 266                 break;
 267         }
 268         return false;
 269 }
 270
 271 /**
 272  * Find the master net_device on top of the given net_device.
 273  * @dev: base IPoIB net_device
 274  *
 275  * Returns the master net_device with a reference held, or the same net_device
 276  * if no master exists.
 277  */
 278 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
 279 {
 280         struct net_device *master;
 281
 282         rcu_read_lock();
 283         master = netdev_master_upper_dev_get_rcu(dev);
 284         if (master)
 285                 dev_hold(master);
 286         rcu_read_unlock();
 287
 288         if (master)
 289                 return master;
 290
 291         dev_hold(dev);
 292         return dev;
 293 }
 294
 295 /**
 296  * Find a net_device matching the given address, which is an upper device of
 297  * the given net_device.
 298  * @addr: IP address to look for.
 299  * @dev: base IPoIB net_device
 300  *
 301  * If found, returns the net_device with a reference held. Otherwise return
 302  * NULL.
 303  */
 304 static struct net_device *ipoib_get_net_dev_match_addr(
 305                 const struct sockaddr *addr, struct net_device *dev)
 306 {
 307         struct net_device *upper,
 308                           *result = NULL;
 309         struct list_head *iter;
 310
 311         rcu_read_lock();
 312         if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
 313                 dev_hold(dev);
 314                 result = dev;
 315                 goto out;
 316         }
 317
 318         netdev_for_each_all_upper_dev_rcu(dev, upper, iter) {
 319                 if (ipoib_is_dev_match_addr_rcu(addr, upper)) {
 320                         dev_hold(upper);
 321                         result = upper;
 322                         break;
 323                 }
 324         }
 325 out:
 326         rcu_read_unlock();
 327         return result;
 328 }
 329
 330 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
 331  * pkey_index and address, if one exists.
 332  *
 333  * @found_net_dev: contains a matching net_device if the return value >= 1,
 334  * with a reference held. */
 335 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
 336                                      const union ib_gid *gid,
 337                                      u16 pkey_index,
 338                                      const struct sockaddr *addr,
 339                                      int nesting,
 340                                      struct net_device **found_net_dev)
 341 {
 342         struct ipoib_dev_priv *child_priv;
 343         struct net_device *net_dev = NULL;
 344         int matches = 0;
 345
 346         if (priv->pkey_index == pkey_index &&
 347             (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
 348                 if (!addr) {
 349                         net_dev = ipoib_get_master_net_dev(priv->dev);
 350                 } else {
 351                         /* Verify the net_device matches the IP address, as
 352                          * IPoIB child devices currently share a GID. */
 353                         net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
 354                 }
 355                 if (net_dev) {
 356                         if (!*found_net_dev)
 357                                 *found_net_dev = net_dev;
 358                         else
 359                                 dev_put(net_dev);
 360                         ++matches;
 361                 }
 362         }
 363
 364         /* Check child interfaces */
 365         down_read_nested(&priv->vlan_rwsem, nesting);
 366         list_for_each_entry(child_priv, &priv->child_intfs, list) {
 367                 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
 368                                                     pkey_index, addr,
 369                                                     nesting + 1,
 370                                                     found_net_dev);
 371                 if (matches > 1)
 372                         break;
 373         }
 374         up_read(&priv->vlan_rwsem);
 375
 376         return matches;
 377 }
 378
 379 /* Returns the number of matching net_devs found (between 0 and 2). Also
 380  * return the matching net_device in the @net_dev parameter, holding a
 381  * reference to the net_device, if the number of matches >= 1 */
 382 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
 383                                          u16 pkey_index,
 384                                          const union ib_gid *gid,
 385                                          const struct sockaddr *addr,
 386                                          struct net_device **net_dev)
 387 {
 388         struct ipoib_dev_priv *priv;
 389         int matches = 0;
 390
 391         *net_dev = NULL;
 392
 393         list_for_each_entry(priv, dev_list, list) {
 394                 if (priv->port != port)
 395                         continue;
 396
 397                 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
 398                                                      addr, 0, net_dev);
 399                 if (matches > 1)
 400                         break;
 401         }
 402
 403         return matches;
 404 }
 405
 406 static struct net_device *ipoib_get_net_dev_by_params(
 407                 struct ib_device *dev, u8 port, u16 pkey,
 408                 const union ib_gid *gid, const struct sockaddr *addr,
 409                 void *client_data)
 410 {
 411         struct net_device *net_dev;
 412         struct list_head *dev_list = client_data;
 413         u16 pkey_index;
 414         int matches;
 415         int ret;
 416
 417         if (!rdma_protocol_ib(dev, port))
 418                 return NULL;
 419
 420         ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
 421         if (ret)
 422                 return NULL;
 423
 424         if (!dev_list)
 425                 return NULL;
 426
 427         /* See if we can find a unique device matching the L2 parameters */
 428         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 429                                                 gid, NULL, &net_dev);
 430
 431         switch (matches) {
 432         case 0:
 433                 return NULL;
 434         case 1:
 435                 return net_dev;
 436         }
 437
 438         dev_put(net_dev);
 439
 440         /* Couldn't find a unique device with L2 parameters only. Use L3
 441          * address to uniquely match the net device */
 442         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 443                                                 gid, addr, &net_dev);
 444         switch (matches) {
 445         case 0:
 446                 return NULL;
 447         default:
 448                 dev_warn_ratelimited(&dev->dev,
 449                                      "duplicate IP address detected\n");
 450                 /* Fall through */
 451         case 1:
 452                 return net_dev;
 453         }
 454 }
 455
 456 int ipoib_set_mode(struct net_device *dev, const char *buf)
 457 {
 458         struct ipoib_dev_priv *priv = netdev_priv(dev);
 459
 460         /* flush paths if we switch modes so that connections are restarted */
 461         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
 462                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 463                 ipoib_warn(priv, "enabling connected mode "
 464                            "will cause multicast packet drops\n");
 465                 netdev_update_features(dev);
 466                 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
 467                 rtnl_unlock();
 468                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 469
 470                 ipoib_flush_paths(dev);
 471                 rtnl_lock();
 472                 return 0;
 473         }
 474
 475         if (!strcmp(buf, "datagram\n")) {
 476                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 477                 netdev_update_features(dev);
 478                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 479                 rtnl_unlock();
 480                 ipoib_flush_paths(dev);
 481                 rtnl_lock();
 482                 return 0;
 483         }
 484
 485         return -EINVAL;
 486 }
 487
 488 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 489 {
 490         struct ipoib_dev_priv *priv = netdev_priv(dev);
 491         struct rb_node *n = priv->path_tree.rb_node;
 492         struct ipoib_path *path;
 493         int ret;
 494
 495         while (n) {
 496                 path = rb_entry(n, struct ipoib_path, rb_node);
 497
 498                 ret = memcmp(gid, path->pathrec.dgid.raw,
 499                              sizeof (union ib_gid));
 500
 501                 if (ret < 0)
 502                         n = n->rb_left;
 503                 else if (ret > 0)
 504                         n = n->rb_right;
 505                 else
 506                         return path;
 507         }
 508
 509         return NULL;
 510 }
 511
 512 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 513 {
 514         struct ipoib_dev_priv *priv = netdev_priv(dev);
 515         struct rb_node **n = &priv->path_tree.rb_node;
 516         struct rb_node *pn = NULL;
 517         struct ipoib_path *tpath;
 518         int ret;
 519
 520         while (*n) {
 521                 pn = *n;
 522                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 523
 524                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 525                              sizeof (union ib_gid));
 526                 if (ret < 0)
 527                         n = &pn->rb_left;
 528                 else if (ret > 0)
 529                         n = &pn->rb_right;
 530                 else
 531                         return -EEXIST;
 532         }
 533
 534         rb_link_node(&path->rb_node, pn, n);
 535         rb_insert_color(&path->rb_node, &priv->path_tree);
 536
 537         list_add_tail(&path->list, &priv->path_list);
 538
 539         return 0;
 540 }
 541
 542 static void path_free(struct net_device *dev, struct ipoib_path *path)
 543 {
 544         struct sk_buff *skb;
 545
 546         while ((skb = __skb_dequeue(&path->queue)))
 547                 dev_kfree_skb_irq(skb);
 548
 549         ipoib_dbg(netdev_priv(dev), "path_free\n");
 550
 551         /* remove all neigh connected to this path */
 552         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 553
 554         if (path->ah)
 555                 ipoib_put_ah(path->ah);
 556
 557         kfree(path);
 558 }
 559
 560 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 561
 562 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 563 {
 564         struct ipoib_path_iter *iter;
 565
 566         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 567         if (!iter)
 568                 return NULL;
 569
 570         iter->dev = dev;
 571         memset(iter->path.pathrec.dgid.raw, 0, 16);
 572
 573         if (ipoib_path_iter_next(iter)) {
 574                 kfree(iter);
 575                 return NULL;
 576         }
 577
 578         return iter;
 579 }
 580
 581 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 582 {
 583         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 584         struct rb_node *n;
 585         struct ipoib_path *path;
 586         int ret = 1;
 587
 588         spin_lock_irq(&priv->lock);
 589
 590         n = rb_first(&priv->path_tree);
 591
 592         while (n) {
 593                 path = rb_entry(n, struct ipoib_path, rb_node);
 594
 595                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 596                            sizeof (union ib_gid)) < 0) {
 597                         iter->path = *path;
 598                         ret = 0;
 599                         break;
 600                 }
 601
 602                 n = rb_next(n);
 603         }
 604
 605         spin_unlock_irq(&priv->lock);
 606
 607         return ret;
 608 }
 609
 610 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 611                           struct ipoib_path *path)
 612 {
 613         *path = iter->path;
 614 }
 615
 616 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 617
 618 void ipoib_mark_paths_invalid(struct net_device *dev)
 619 {
 620         struct ipoib_dev_priv *priv = netdev_priv(dev);
 621         struct ipoib_path *path, *tp;
 622
 623         spin_lock_irq(&priv->lock);
 624
 625         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 626                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
 627                         be16_to_cpu(path->pathrec.dlid),
 628                         path->pathrec.dgid.raw);
 629                 path->valid =  0;
 630         }
 631
 632         spin_unlock_irq(&priv->lock);
 633 }
 634
 635 struct classport_info_context {
 636         struct ipoib_dev_priv   *priv;
 637         struct completion       done;
 638         struct ib_sa_query      *sa_query;
 639 };
 640
 641 static void classport_info_query_cb(int status, struct ib_class_port_info *rec,
 642                                     void *context)
 643 {
 644         struct classport_info_context *cb_ctx = context;
 645         struct ipoib_dev_priv *priv;
 646
 647         WARN_ON(!context);
 648
 649         priv = cb_ctx->priv;
 650
 651         if (status || !rec) {
 652                 pr_debug("device: %s failed query classport_info status: %d\n",
 653                          priv->dev->name, status);
 654                 /* keeps the default, will try next mcast_restart */
 655                 priv->sm_fullmember_sendonly_support = false;
 656                 goto out;
 657         }
 658
 659         if (ib_get_cpi_capmask2(rec) &
 660             IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT) {
 661                 pr_debug("device: %s enabled fullmember-sendonly for sendonly MCG\n",
 662                          priv->dev->name);
 663                 priv->sm_fullmember_sendonly_support = true;
 664         } else {
 665                 pr_debug("device: %s disabled fullmember-sendonly for sendonly MCG\n",
 666                          priv->dev->name);
 667                 priv->sm_fullmember_sendonly_support = false;
 668         }
 669
 670 out:
 671         complete(&cb_ctx->done);
 672 }
 673
 674 int ipoib_check_sm_sendonly_fullmember_support(struct ipoib_dev_priv *priv)
 675 {
 676         struct classport_info_context *callback_context;
 677         int ret;
 678
 679         callback_context = kmalloc(sizeof(*callback_context), GFP_KERNEL);
 680         if (!callback_context)
 681                 return -ENOMEM;
 682
 683         callback_context->priv = priv;
 684         init_completion(&callback_context->done);
 685
 686         ret = ib_sa_classport_info_rec_query(&ipoib_sa_client,
 687                                              priv->ca, priv->port, 3000,
 688                                              GFP_KERNEL,
 689                                              classport_info_query_cb,
 690                                              callback_context,
 691                                              &callback_context->sa_query);
 692         if (ret < 0) {
 693                 pr_info("%s failed to send ib_sa_classport_info query, ret: %d\n",
 694                         priv->dev->name, ret);
 695                 kfree(callback_context);
 696                 return ret;
 697         }
 698
 699         /* waiting for the callback to finish before returnning */
 700         wait_for_completion(&callback_context->done);
 701         kfree(callback_context);
 702
 703         return ret;
 704 }
 705
 706 void ipoib_flush_paths(struct net_device *dev)
 707 {
 708         struct ipoib_dev_priv *priv = netdev_priv(dev);
 709         struct ipoib_path *path, *tp;
 710         LIST_HEAD(remove_list);
 711         unsigned long flags;
 712
 713         netif_tx_lock_bh(dev);
 714         spin_lock_irqsave(&priv->lock, flags);
 715
 716         list_splice_init(&priv->path_list, &remove_list);
 717
 718         list_for_each_entry(path, &remove_list, list)
 719                 rb_erase(&path->rb_node, &priv->path_tree);
 720
 721         list_for_each_entry_safe(path, tp, &remove_list, list) {
 722                 if (path->query)
 723                         ib_sa_cancel_query(path->query_id, path->query);
 724                 spin_unlock_irqrestore(&priv->lock, flags);
 725                 netif_tx_unlock_bh(dev);
 726                 wait_for_completion(&path->done);
 727                 path_free(dev, path);
 728                 netif_tx_lock_bh(dev);
 729                 spin_lock_irqsave(&priv->lock, flags);
 730         }
 731
 732         spin_unlock_irqrestore(&priv->lock, flags);
 733         netif_tx_unlock_bh(dev);
 734 }
 735
 736 static void path_rec_completion(int status,
 737                                 struct ib_sa_path_rec *pathrec,
 738                                 void *path_ptr)
 739 {
 740         struct ipoib_path *path = path_ptr;
 741         struct net_device *dev = path->dev;
 742         struct ipoib_dev_priv *priv = netdev_priv(dev);
 743         struct ipoib_ah *ah = NULL;
 744         struct ipoib_ah *old_ah = NULL;
 745         struct ipoib_neigh *neigh, *tn;
 746         struct sk_buff_head skqueue;
 747         struct sk_buff *skb;
 748         unsigned long flags;
 749
 750         if (!status)
 751                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 752                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
 753         else
 754                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 755                           status, path->pathrec.dgid.raw);
 756
 757         skb_queue_head_init(&skqueue);
 758
 759         if (!status) {
 760                 struct ib_ah_attr av;
 761
 762                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 763                         ah = ipoib_create_ah(dev, priv->pd, &av);
 764         }
 765
 766         spin_lock_irqsave(&priv->lock, flags);
 767
 768         if (!IS_ERR_OR_NULL(ah)) {
 769                 path->pathrec = *pathrec;
 770
 771                 old_ah   = path->ah;
 772                 path->ah = ah;
 773
 774                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 775                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 776
 777                 while ((skb = __skb_dequeue(&path->queue)))
 778                         __skb_queue_tail(&skqueue, skb);
 779
 780                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 781                         if (neigh->ah) {
 782                                 WARN_ON(neigh->ah != old_ah);
 783                                 /*
 784                                  * Dropping the ah reference inside
 785                                  * priv->lock is safe here, because we
 786                                  * will hold one more reference from
 787                                  * the original value of path->ah (ie
 788                                  * old_ah).
 789                                  */
 790                                 ipoib_put_ah(neigh->ah);
 791                         }
 792                         kref_get(&path->ah->ref);
 793                         neigh->ah = path->ah;
 794
 795                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 796                                 if (!ipoib_cm_get(neigh))
 797                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 798                                                                                path,
 799                                                                                neigh));
 800                                 if (!ipoib_cm_get(neigh)) {
 801                                         ipoib_neigh_free(neigh);
 802                                         continue;
 803                                 }
 804                         }
 805
 806                         while ((skb = __skb_dequeue(&neigh->queue)))
 807                                 __skb_queue_tail(&skqueue, skb);
 808                 }
 809                 path->valid = 1;
 810         }
 811
 812         path->query = NULL;
 813         complete(&path->done);
 814
 815         spin_unlock_irqrestore(&priv->lock, flags);
 816
 817         if (IS_ERR_OR_NULL(ah))
 818                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 819
 820         if (old_ah)
 821                 ipoib_put_ah(old_ah);
 822
 823         while ((skb = __skb_dequeue(&skqueue))) {
 824                 skb->dev = dev;
 825                 if (dev_queue_xmit(skb))
 826                         ipoib_warn(priv, "dev_queue_xmit failed "
 827                                    "to requeue packet\n");
 828         }
 829 }
 830
 831 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 832 {
 833         struct ipoib_dev_priv *priv = netdev_priv(dev);
 834         struct ipoib_path *path;
 835
 836         if (!priv->broadcast)
 837                 return NULL;
 838
 839         path = kzalloc(sizeof *path, GFP_ATOMIC);
 840         if (!path)
 841                 return NULL;
 842
 843         path->dev = dev;
 844
 845         skb_queue_head_init(&path->queue);
 846
 847         INIT_LIST_HEAD(&path->neigh_list);
 848
 849         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 850         path->pathrec.sgid          = priv->local_gid;
 851         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 852         path->pathrec.numb_path     = 1;
 853         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 854
 855         return path;
 856 }
 857
 858 static int path_rec_start(struct net_device *dev,
 859                           struct ipoib_path *path)
 860 {
 861         struct ipoib_dev_priv *priv = netdev_priv(dev);
 862
 863         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 864                   path->pathrec.dgid.raw);
 865
 866         init_completion(&path->done);
 867
 868         path->query_id =
 869                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 870                                    &path->pathrec,
 871                                    IB_SA_PATH_REC_DGID          |
 872                                    IB_SA_PATH_REC_SGID          |
 873                                    IB_SA_PATH_REC_NUMB_PATH     |
 874                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 875                                    IB_SA_PATH_REC_PKEY,
 876                                    1000, GFP_ATOMIC,
 877                                    path_rec_completion,
 878                                    path, &path->query);
 879         if (path->query_id < 0) {
 880                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 881                 path->query = NULL;
 882                 complete(&path->done);
 883                 return path->query_id;
 884         }
 885
 886         return 0;
 887 }
 888
 889 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
 890                            struct net_device *dev)
 891 {
 892         struct ipoib_dev_priv *priv = netdev_priv(dev);
 893         struct ipoib_path *path;
 894         struct ipoib_neigh *neigh;
 895         unsigned long flags;
 896
 897         spin_lock_irqsave(&priv->lock, flags);
 898         neigh = ipoib_neigh_alloc(daddr, dev);
 899         if (!neigh) {
 900                 spin_unlock_irqrestore(&priv->lock, flags);
 901                 ++dev->stats.tx_dropped;
 902                 dev_kfree_skb_any(skb);
 903                 return;
 904         }
 905
 906         path = __path_find(dev, daddr + 4);
 907         if (!path) {
 908                 path = path_rec_create(dev, daddr + 4);
 909                 if (!path)
 910                         goto err_path;
 911
 912                 __path_add(dev, path);
 913         }
 914
 915         list_add_tail(&neigh->list, &path->neigh_list);
 916
 917         if (path->ah) {
 918                 kref_get(&path->ah->ref);
 919                 neigh->ah = path->ah;
 920
 921                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 922                         if (!ipoib_cm_get(neigh))
 923                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 924                         if (!ipoib_cm_get(neigh)) {
 925                                 ipoib_neigh_free(neigh);
 926                                 goto err_drop;
 927                         }
 928                         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 929                                 __skb_queue_tail(&neigh->queue, skb);
 930                         else {
 931                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 932                                            skb_queue_len(&neigh->queue));
 933                                 goto err_drop;
 934                         }
 935                 } else {
 936                         spin_unlock_irqrestore(&priv->lock, flags);
 937                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
 938                         ipoib_neigh_put(neigh);
 939                         return;
 940                 }
 941         } else {
 942                 neigh->ah  = NULL;
 943
 944                 if (!path->query && path_rec_start(dev, path))
 945                         goto err_path;
 946                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
 947                         __skb_queue_tail(&neigh->queue, skb);
 948                 else
 949                         goto err_drop;
 950         }
 951
 952         spin_unlock_irqrestore(&priv->lock, flags);
 953         ipoib_neigh_put(neigh);
 954         return;
 955
 956 err_path:
 957         ipoib_neigh_free(neigh);
 958 err_drop:
 959         ++dev->stats.tx_dropped;
 960         dev_kfree_skb_any(skb);
 961
 962         spin_unlock_irqrestore(&priv->lock, flags);
 963         ipoib_neigh_put(neigh);
 964 }
 965
 966 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 967                              struct ipoib_cb *cb)
 968 {
 969         struct ipoib_dev_priv *priv = netdev_priv(dev);
 970         struct ipoib_path *path;
 971         unsigned long flags;
 972
 973         spin_lock_irqsave(&priv->lock, flags);
 974
 975         path = __path_find(dev, cb->hwaddr + 4);
 976         if (!path || !path->valid) {
 977                 int new_path = 0;
 978
 979                 if (!path) {
 980                         path = path_rec_create(dev, cb->hwaddr + 4);
 981                         new_path = 1;
 982                 }
 983                 if (path) {
 984                         if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 985                                 __skb_queue_tail(&path->queue, skb);
 986                         } else {
 987                                 ++dev->stats.tx_dropped;
 988                                 dev_kfree_skb_any(skb);
 989                         }
 990
 991                         if (!path->query && path_rec_start(dev, path)) {
 992                                 spin_unlock_irqrestore(&priv->lock, flags);
 993                                 if (new_path)
 994                                         path_free(dev, path);
 995                                 return;
 996                         } else
 997                                 __path_add(dev, path);
 998                 } else {
 999                         ++dev->stats.tx_dropped;
1000                         dev_kfree_skb_any(skb);
1001                 }
1002
1003                 spin_unlock_irqrestore(&priv->lock, flags);
1004                 return;
1005         }
1006
1007         if (path->ah) {
1008                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
1009                           be16_to_cpu(path->pathrec.dlid));
1010
1011                 spin_unlock_irqrestore(&priv->lock, flags);
1012                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
1013                 return;
1014         } else if ((path->query || !path_rec_start(dev, path)) &&
1015                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1016                 __skb_queue_tail(&path->queue, skb);
1017         } else {
1018                 ++dev->stats.tx_dropped;
1019                 dev_kfree_skb_any(skb);
1020         }
1021
1022         spin_unlock_irqrestore(&priv->lock, flags);
1023 }
1024
1025 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1026 {
1027         struct ipoib_dev_priv *priv = netdev_priv(dev);
1028         struct ipoib_neigh *neigh;
1029         struct ipoib_cb *cb = ipoib_skb_cb(skb);
1030         struct ipoib_header *header;
1031         unsigned long flags;
1032
1033         header = (struct ipoib_header *) skb->data;
1034
1035         if (unlikely(cb->hwaddr[4] == 0xff)) {
1036                 /* multicast, arrange "if" according to probability */
1037                 if ((header->proto != htons(ETH_P_IP)) &&
1038                     (header->proto != htons(ETH_P_IPV6)) &&
1039                     (header->proto != htons(ETH_P_ARP)) &&
1040                     (header->proto != htons(ETH_P_RARP)) &&
1041                     (header->proto != htons(ETH_P_TIPC))) {
1042                         /* ethertype not supported by IPoIB */
1043                         ++dev->stats.tx_dropped;
1044                         dev_kfree_skb_any(skb);
1045                         return NETDEV_TX_OK;
1046                 }
1047                 /* Add in the P_Key for multicast*/
1048                 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1049                 cb->hwaddr[9] = priv->pkey & 0xff;
1050
1051                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
1052                 if (likely(neigh))
1053                         goto send_using_neigh;
1054                 ipoib_mcast_send(dev, cb->hwaddr, skb);
1055                 return NETDEV_TX_OK;
1056         }
1057
1058         /* unicast, arrange "switch" according to probability */
1059         switch (header->proto) {
1060         case htons(ETH_P_IP):
1061         case htons(ETH_P_IPV6):
1062         case htons(ETH_P_TIPC):
1063                 neigh = ipoib_neigh_get(dev, cb->hwaddr);
1064                 if (unlikely(!neigh)) {
1065                         neigh_add_path(skb, cb->hwaddr, dev);
1066                         return NETDEV_TX_OK;
1067                 }
1068                 break;
1069         case htons(ETH_P_ARP):
1070         case htons(ETH_P_RARP):
1071                 /* for unicast ARP and RARP should always perform path find */
1072                 unicast_arp_send(skb, dev, cb);
1073                 return NETDEV_TX_OK;
1074         default:
1075                 /* ethertype not supported by IPoIB */
1076                 ++dev->stats.tx_dropped;
1077                 dev_kfree_skb_any(skb);
1078                 return NETDEV_TX_OK;
1079         }
1080
1081 send_using_neigh:
1082         /* note we now hold a ref to neigh */
1083         if (ipoib_cm_get(neigh)) {
1084                 if (ipoib_cm_up(neigh)) {
1085                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1086                         goto unref;
1087                 }
1088         } else if (neigh->ah) {
1089                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
1090                 goto unref;
1091         }
1092
1093         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1094                 spin_lock_irqsave(&priv->lock, flags);
1095                 __skb_queue_tail(&neigh->queue, skb);
1096                 spin_unlock_irqrestore(&priv->lock, flags);
1097         } else {
1098                 ++dev->stats.tx_dropped;
1099                 dev_kfree_skb_any(skb);
1100         }
1101
1102 unref:
1103         ipoib_neigh_put(neigh);
1104
1105         return NETDEV_TX_OK;
1106 }
1107
1108 static void ipoib_timeout(struct net_device *dev)
1109 {
1110         struct ipoib_dev_priv *priv = netdev_priv(dev);
1111
1112         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1113                    jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1114         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1115                    netif_queue_stopped(dev),
1116                    priv->tx_head, priv->tx_tail);
1117         /* XXX reset QP, etc. */
1118 }
1119
1120 static int ipoib_hard_header(struct sk_buff *skb,
1121                              struct net_device *dev,
1122                              unsigned short type,
1123                              const void *daddr, const void *saddr, unsigned len)
1124 {
1125         struct ipoib_header *header;
1126         struct ipoib_cb *cb = ipoib_skb_cb(skb);
1127
1128         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
1129
1130         header->proto = htons(type);
1131         header->reserved = 0;
1132
1133         /*
1134          * we don't rely on dst_entry structure,  always stuff the
1135          * destination address into skb->cb so we can figure out where
1136          * to send the packet later.
1137          */
1138         memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
1139
1140         return sizeof *header;
1141 }
1142
1143 static void ipoib_set_mcast_list(struct net_device *dev)
1144 {
1145         struct ipoib_dev_priv *priv = netdev_priv(dev);
1146
1147         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1148                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1149                 return;
1150         }
1151
1152         queue_work(priv->wq, &priv->restart_task);
1153 }
1154
1155 static int ipoib_get_iflink(const struct net_device *dev)
1156 {
1157         struct ipoib_dev_priv *priv = netdev_priv(dev);
1158
1159         /* parent interface */
1160         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1161                 return dev->ifindex;
1162
1163         /* child/vlan interface */
1164         return priv->parent->ifindex;
1165 }
1166
1167 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1168 {
1169         /*
1170          * Use only the address parts that contributes to spreading
1171          * The subnet prefix is not used as one can not connect to
1172          * same remote port (GUID) using the same remote QPN via two
1173          * different subnets.
1174          */
1175          /* qpn octets[1:4) & port GUID octets[12:20) */
1176         u32 *d32 = (u32 *) daddr;
1177         u32 hv;
1178
1179         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1180         return hv & htbl->mask;
1181 }
1182
1183 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1184 {
1185         struct ipoib_dev_priv *priv = netdev_priv(dev);
1186         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1187         struct ipoib_neigh_hash *htbl;
1188         struct ipoib_neigh *neigh = NULL;
1189         u32 hash_val;
1190
1191         rcu_read_lock_bh();
1192
1193         htbl = rcu_dereference_bh(ntbl->htbl);
1194
1195         if (!htbl)
1196                 goto out_unlock;
1197
1198         hash_val = ipoib_addr_hash(htbl, daddr);
1199         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1200              neigh != NULL;
1201              neigh = rcu_dereference_bh(neigh->hnext)) {
1202                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1203                         /* found, take one ref on behalf of the caller */
1204                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1205                                 /* deleted */
1206                                 neigh = NULL;
1207                                 goto out_unlock;
1208                         }
1209                         neigh->alive = jiffies;
1210                         goto out_unlock;
1211                 }
1212         }
1213
1214 out_unlock:
1215         rcu_read_unlock_bh();
1216         return neigh;
1217 }
1218
1219 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1220 {
1221         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1222         struct ipoib_neigh_hash *htbl;
1223         unsigned long neigh_obsolete;
1224         unsigned long dt;
1225         unsigned long flags;
1226         int i;
1227         LIST_HEAD(remove_list);
1228
1229         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1230                 return;
1231
1232         spin_lock_irqsave(&priv->lock, flags);
1233
1234         htbl = rcu_dereference_protected(ntbl->htbl,
1235                                          lockdep_is_held(&priv->lock));
1236
1237         if (!htbl)
1238                 goto out_unlock;
1239
1240         /* neigh is obsolete if it was idle for two GC periods */
1241         dt = 2 * arp_tbl.gc_interval;
1242         neigh_obsolete = jiffies - dt;
1243         /* handle possible race condition */
1244         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1245                 goto out_unlock;
1246
1247         for (i = 0; i < htbl->size; i++) {
1248                 struct ipoib_neigh *neigh;
1249                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1250
1251                 while ((neigh = rcu_dereference_protected(*np,
1252                                                           lockdep_is_held(&priv->lock))) != NULL) {
1253                         /* was the neigh idle for two GC periods */
1254                         if (time_after(neigh_obsolete, neigh->alive)) {
1255
1256                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1257
1258                                 rcu_assign_pointer(*np,
1259                                                    rcu_dereference_protected(neigh->hnext,
1260                                                                              lockdep_is_held(&priv->lock)));
1261                                 /* remove from path/mc list */
1262                                 list_del(&neigh->list);
1263                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1264                         } else {
1265                                 np = &neigh->hnext;
1266                         }
1267
1268                 }
1269         }
1270
1271 out_unlock:
1272         spin_unlock_irqrestore(&priv->lock, flags);
1273         ipoib_mcast_remove_list(&remove_list);
1274 }
1275
1276 static void ipoib_reap_neigh(struct work_struct *work)
1277 {
1278         struct ipoib_dev_priv *priv =
1279                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1280
1281         __ipoib_reap_neigh(priv);
1282
1283         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1284                 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1285                                    arp_tbl.gc_interval);
1286 }
1287
1288
1289 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1290                                       struct net_device *dev)
1291 {
1292         struct ipoib_neigh *neigh;
1293
1294         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1295         if (!neigh)
1296                 return NULL;
1297
1298         neigh->dev = dev;
1299         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1300         skb_queue_head_init(&neigh->queue);
1301         INIT_LIST_HEAD(&neigh->list);
1302         ipoib_cm_set(neigh, NULL);
1303         /* one ref on behalf of the caller */
1304         atomic_set(&neigh->refcnt, 1);
1305
1306         return neigh;
1307 }
1308
1309 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1310                                       struct net_device *dev)
1311 {
1312         struct ipoib_dev_priv *priv = netdev_priv(dev);
1313         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1314         struct ipoib_neigh_hash *htbl;
1315         struct ipoib_neigh *neigh;
1316         u32 hash_val;
1317
1318         htbl = rcu_dereference_protected(ntbl->htbl,
1319                                          lockdep_is_held(&priv->lock));
1320         if (!htbl) {
1321                 neigh = NULL;
1322                 goto out_unlock;
1323         }
1324
1325         /* need to add a new neigh, but maybe some other thread succeeded?
1326          * recalc hash, maybe hash resize took place so we do a search
1327          */
1328         hash_val = ipoib_addr_hash(htbl, daddr);
1329         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1330                                                lockdep_is_held(&priv->lock));
1331              neigh != NULL;
1332              neigh = rcu_dereference_protected(neigh->hnext,
1333                                                lockdep_is_held(&priv->lock))) {
1334                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1335                         /* found, take one ref on behalf of the caller */
1336                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1337                                 /* deleted */
1338                                 neigh = NULL;
1339                                 break;
1340                         }
1341                         neigh->alive = jiffies;
1342                         goto out_unlock;
1343                 }
1344         }
1345
1346         neigh = ipoib_neigh_ctor(daddr, dev);
1347         if (!neigh)
1348                 goto out_unlock;
1349
1350         /* one ref on behalf of the hash table */
1351         atomic_inc(&neigh->refcnt);
1352         neigh->alive = jiffies;
1353         /* put in hash */
1354         rcu_assign_pointer(neigh->hnext,
1355                            rcu_dereference_protected(htbl->buckets[hash_val],
1356                                                      lockdep_is_held(&priv->lock)));
1357         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1358         atomic_inc(&ntbl->entries);
1359
1360 out_unlock:
1361
1362         return neigh;
1363 }
1364
1365 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1366 {
1367         /* neigh reference count was dropprd to zero */
1368         struct net_device *dev = neigh->dev;
1369         struct ipoib_dev_priv *priv = netdev_priv(dev);
1370         struct sk_buff *skb;
1371         if (neigh->ah)
1372                 ipoib_put_ah(neigh->ah);
1373         while ((skb = __skb_dequeue(&neigh->queue))) {
1374                 ++dev->stats.tx_dropped;
1375                 dev_kfree_skb_any(skb);
1376         }
1377         if (ipoib_cm_get(neigh))
1378                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1379         ipoib_dbg(netdev_priv(dev),
1380                   "neigh free for %06x %pI6\n",
1381                   IPOIB_QPN(neigh->daddr),
1382                   neigh->daddr + 4);
1383         kfree(neigh);
1384         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1385                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1386                         complete(&priv->ntbl.flushed);
1387         }
1388 }
1389
1390 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1391 {
1392         /* Called as a result of removal from hash table */
1393         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1394         /* note TX context may hold another ref */
1395         ipoib_neigh_put(neigh);
1396 }
1397
1398 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1399 {
1400         struct net_device *dev = neigh->dev;
1401         struct ipoib_dev_priv *priv = netdev_priv(dev);
1402         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1403         struct ipoib_neigh_hash *htbl;
1404         struct ipoib_neigh __rcu **np;
1405         struct ipoib_neigh *n;
1406         u32 hash_val;
1407
1408         htbl = rcu_dereference_protected(ntbl->htbl,
1409                                         lockdep_is_held(&priv->lock));
1410         if (!htbl)
1411                 return;
1412
1413         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1414         np = &htbl->buckets[hash_val];
1415         for (n = rcu_dereference_protected(*np,
1416                                             lockdep_is_held(&priv->lock));
1417              n != NULL;
1418              n = rcu_dereference_protected(*np,
1419                                         lockdep_is_held(&priv->lock))) {
1420                 if (n == neigh) {
1421                         /* found */
1422                         rcu_assign_pointer(*np,
1423                                            rcu_dereference_protected(neigh->hnext,
1424                                                                      lockdep_is_held(&priv->lock)));
1425                         /* remove from parent list */
1426                         list_del(&neigh->list);
1427                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1428                         return;
1429                 } else {
1430                         np = &n->hnext;
1431                 }
1432         }
1433 }
1434
1435 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1436 {
1437         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1438         struct ipoib_neigh_hash *htbl;
1439         struct ipoib_neigh __rcu **buckets;
1440         u32 size;
1441
1442         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1443         ntbl->htbl = NULL;
1444         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1445         if (!htbl)
1446                 return -ENOMEM;
1447         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1448         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1449         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1450         if (!buckets) {
1451                 kfree(htbl);
1452                 return -ENOMEM;
1453         }
1454         htbl->size = size;
1455         htbl->mask = (size - 1);
1456         htbl->buckets = buckets;
1457         RCU_INIT_POINTER(ntbl->htbl, htbl);
1458         htbl->ntbl = ntbl;
1459         atomic_set(&ntbl->entries, 0);
1460
1461         /* start garbage collection */
1462         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1463         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1464                            arp_tbl.gc_interval);
1465
1466         return 0;
1467 }
1468
1469 static void neigh_hash_free_rcu(struct rcu_head *head)
1470 {
1471         struct ipoib_neigh_hash *htbl = container_of(head,
1472                                                     struct ipoib_neigh_hash,
1473                                                     rcu);
1474         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1475         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1476
1477         kfree(buckets);
1478         kfree(htbl);
1479         complete(&ntbl->deleted);
1480 }
1481
1482 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1483 {
1484         struct ipoib_dev_priv *priv = netdev_priv(dev);
1485         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1486         struct ipoib_neigh_hash *htbl;
1487         unsigned long flags;
1488         int i;
1489
1490         /* remove all neigh connected to a given path or mcast */
1491         spin_lock_irqsave(&priv->lock, flags);
1492
1493         htbl = rcu_dereference_protected(ntbl->htbl,
1494                                          lockdep_is_held(&priv->lock));
1495
1496         if (!htbl)
1497                 goto out_unlock;
1498
1499         for (i = 0; i < htbl->size; i++) {
1500                 struct ipoib_neigh *neigh;
1501                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1502
1503                 while ((neigh = rcu_dereference_protected(*np,
1504                                                           lockdep_is_held(&priv->lock))) != NULL) {
1505                         /* delete neighs belong to this parent */
1506                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1507                                 rcu_assign_pointer(*np,
1508                                                    rcu_dereference_protected(neigh->hnext,
1509                                                                              lockdep_is_held(&priv->lock)));
1510                                 /* remove from parent list */
1511                                 list_del(&neigh->list);
1512                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1513                         } else {
1514                                 np = &neigh->hnext;
1515                         }
1516
1517                 }
1518         }
1519 out_unlock:
1520         spin_unlock_irqrestore(&priv->lock, flags);
1521 }
1522
1523 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1524 {
1525         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1526         struct ipoib_neigh_hash *htbl;
1527         unsigned long flags;
1528         int i, wait_flushed = 0;
1529
1530         init_completion(&priv->ntbl.flushed);
1531
1532         spin_lock_irqsave(&priv->lock, flags);
1533
1534         htbl = rcu_dereference_protected(ntbl->htbl,
1535                                         lockdep_is_held(&priv->lock));
1536         if (!htbl)
1537                 goto out_unlock;
1538
1539         wait_flushed = atomic_read(&priv->ntbl.entries);
1540         if (!wait_flushed)
1541                 goto free_htbl;
1542
1543         for (i = 0; i < htbl->size; i++) {
1544                 struct ipoib_neigh *neigh;
1545                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1546
1547                 while ((neigh = rcu_dereference_protected(*np,
1548                                        lockdep_is_held(&priv->lock))) != NULL) {
1549                         rcu_assign_pointer(*np,
1550                                            rcu_dereference_protected(neigh->hnext,
1551                                                                      lockdep_is_held(&priv->lock)));
1552                         /* remove from path/mc list */
1553                         list_del(&neigh->list);
1554                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1555                 }
1556         }
1557
1558 free_htbl:
1559         rcu_assign_pointer(ntbl->htbl, NULL);
1560         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1561
1562 out_unlock:
1563         spin_unlock_irqrestore(&priv->lock, flags);
1564         if (wait_flushed)
1565                 wait_for_completion(&priv->ntbl.flushed);
1566 }
1567
1568 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1569 {
1570         struct ipoib_dev_priv *priv = netdev_priv(dev);
1571         int stopped;
1572
1573         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1574         init_completion(&priv->ntbl.deleted);
1575         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1576
1577         /* Stop GC if called at init fail need to cancel work */
1578         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1579         if (!stopped)
1580                 cancel_delayed_work(&priv->neigh_reap_task);
1581
1582         ipoib_flush_neighs(priv);
1583
1584         wait_for_completion(&priv->ntbl.deleted);
1585 }
1586
1587
1588 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1589 {
1590         struct ipoib_dev_priv *priv = netdev_priv(dev);
1591
1592         /* Allocate RX/TX "rings" to hold queued skbs */
1593         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1594                                 GFP_KERNEL);
1595         if (!priv->rx_ring) {
1596                 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1597                        ca->name, ipoib_recvq_size);
1598                 goto out;
1599         }
1600
1601         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1602         if (!priv->tx_ring) {
1603                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1604                        ca->name, ipoib_sendq_size);
1605                 goto out_rx_ring_cleanup;
1606         }
1607
1608         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1609
1610         if (ipoib_ib_dev_init(dev, ca, port))
1611                 goto out_tx_ring_cleanup;
1612
1613         /*
1614          * Must be after ipoib_ib_dev_init so we can allocate a per
1615          * device wq there and use it here
1616          */
1617         if (ipoib_neigh_hash_init(priv) < 0)
1618                 goto out_dev_uninit;
1619
1620         return 0;
1621
1622 out_dev_uninit:
1623         ipoib_ib_dev_cleanup(dev);
1624
1625 out_tx_ring_cleanup:
1626         vfree(priv->tx_ring);
1627
1628 out_rx_ring_cleanup:
1629         kfree(priv->rx_ring);
1630
1631 out:
1632         return -ENOMEM;
1633 }
1634
1635 void ipoib_dev_cleanup(struct net_device *dev)
1636 {
1637         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1638         LIST_HEAD(head);
1639
1640         ASSERT_RTNL();
1641
1642         ipoib_delete_debug_files(dev);
1643
1644         /* Delete any child interfaces first */
1645         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1646                 /* Stop GC on child */
1647                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1648                 cancel_delayed_work(&cpriv->neigh_reap_task);
1649                 unregister_netdevice_queue(cpriv->dev, &head);
1650         }
1651         unregister_netdevice_many(&head);
1652
1653         /*
1654          * Must be before ipoib_ib_dev_cleanup or we delete an in use
1655          * work queue
1656          */
1657         ipoib_neigh_hash_uninit(dev);
1658
1659         ipoib_ib_dev_cleanup(dev);
1660
1661         kfree(priv->rx_ring);
1662         vfree(priv->tx_ring);
1663
1664         priv->rx_ring = NULL;
1665         priv->tx_ring = NULL;
1666 }
1667
1668 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1669 {
1670         struct ipoib_dev_priv *priv = netdev_priv(dev);
1671
1672         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1673 }
1674
1675 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1676                                struct ifla_vf_info *ivf)
1677 {
1678         struct ipoib_dev_priv *priv = netdev_priv(dev);
1679         int err;
1680
1681         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
1682         if (err)
1683                 return err;
1684
1685         ivf->vf = vf;
1686
1687         return 0;
1688 }
1689
1690 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
1691 {
1692         struct ipoib_dev_priv *priv = netdev_priv(dev);
1693
1694         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
1695                 return -EINVAL;
1696
1697         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
1698 }
1699
1700 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
1701                               struct ifla_vf_stats *vf_stats)
1702 {
1703         struct ipoib_dev_priv *priv = netdev_priv(dev);
1704
1705         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
1706 }
1707
1708 static const struct header_ops ipoib_header_ops = {
1709         .create = ipoib_hard_header,
1710 };
1711
1712 static const struct net_device_ops ipoib_netdev_ops_pf = {
1713         .ndo_uninit              = ipoib_uninit,
1714         .ndo_open                = ipoib_open,
1715         .ndo_stop                = ipoib_stop,
1716         .ndo_change_mtu          = ipoib_change_mtu,
1717         .ndo_fix_features        = ipoib_fix_features,
1718         .ndo_start_xmit          = ipoib_start_xmit,
1719         .ndo_tx_timeout          = ipoib_timeout,
1720         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1721         .ndo_get_iflink          = ipoib_get_iflink,
1722         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
1723         .ndo_get_vf_config       = ipoib_get_vf_config,
1724         .ndo_get_vf_stats        = ipoib_get_vf_stats,
1725         .ndo_set_vf_guid         = ipoib_set_vf_guid,
1726         .ndo_set_mac_address     = ipoib_set_mac,
1727 };
1728
1729 static const struct net_device_ops ipoib_netdev_ops_vf = {
1730         .ndo_uninit              = ipoib_uninit,
1731         .ndo_open                = ipoib_open,
1732         .ndo_stop                = ipoib_stop,
1733         .ndo_change_mtu          = ipoib_change_mtu,
1734         .ndo_fix_features        = ipoib_fix_features,
1735         .ndo_start_xmit          = ipoib_start_xmit,
1736         .ndo_tx_timeout          = ipoib_timeout,
1737         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1738         .ndo_get_iflink          = ipoib_get_iflink,
1739 };
1740
1741 void ipoib_setup(struct net_device *dev)
1742 {
1743         struct ipoib_dev_priv *priv = netdev_priv(dev);
1744
1745         if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
1746                 dev->netdev_ops = &ipoib_netdev_ops_vf;
1747         else
1748                 dev->netdev_ops = &ipoib_netdev_ops_pf;
1749
1750         dev->header_ops          = &ipoib_header_ops;
1751
1752         ipoib_set_ethtool_ops(dev);
1753
1754         netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1755
1756         dev->watchdog_timeo      = HZ;
1757
1758         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1759
1760         dev->hard_header_len     = IPOIB_ENCAP_LEN;
1761         dev->addr_len            = INFINIBAND_ALEN;
1762         dev->type                = ARPHRD_INFINIBAND;
1763         dev->tx_queue_len        = ipoib_sendq_size * 2;
1764         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1765                                     NETIF_F_HIGHDMA);
1766         netif_keep_dst(dev);
1767
1768         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1769
1770         priv->dev = dev;
1771
1772         spin_lock_init(&priv->lock);
1773
1774         init_rwsem(&priv->vlan_rwsem);
1775
1776         INIT_LIST_HEAD(&priv->path_list);
1777         INIT_LIST_HEAD(&priv->child_intfs);
1778         INIT_LIST_HEAD(&priv->dead_ahs);
1779         INIT_LIST_HEAD(&priv->multicast_list);
1780
1781         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1782         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1783         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1784         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1785         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1786         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1787         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1788         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1789 }
1790
1791 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1792 {
1793         struct net_device *dev;
1794
1795         dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1796                            NET_NAME_UNKNOWN, ipoib_setup);
1797         if (!dev)
1798                 return NULL;
1799
1800         return netdev_priv(dev);
1801 }
1802
1803 static ssize_t show_pkey(struct device *dev,
1804                          struct device_attribute *attr, char *buf)
1805 {
1806         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1807
1808         return sprintf(buf, "0x%04x\n", priv->pkey);
1809 }
1810 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1811
1812 static ssize_t show_umcast(struct device *dev,
1813                            struct device_attribute *attr, char *buf)
1814 {
1815         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1816
1817         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1818 }
1819
1820 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1821 {
1822         struct ipoib_dev_priv *priv = netdev_priv(ndev);
1823
1824         if (umcast_val > 0) {
1825                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1826                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1827                                 "by userspace\n");
1828         } else
1829                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1830 }
1831
1832 static ssize_t set_umcast(struct device *dev,
1833                           struct device_attribute *attr,
1834                           const char *buf, size_t count)
1835 {
1836         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1837
1838         ipoib_set_umcast(to_net_dev(dev), umcast_val);
1839
1840         return count;
1841 }
1842 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1843
1844 int ipoib_add_umcast_attr(struct net_device *dev)
1845 {
1846         return device_create_file(&dev->dev, &dev_attr_umcast);
1847 }
1848
1849 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
1850 {
1851         struct ipoib_dev_priv *child_priv;
1852         struct net_device *netdev = priv->dev;
1853
1854         netif_addr_lock(netdev);
1855
1856         memcpy(&priv->local_gid.global.interface_id,
1857                &gid->global.interface_id,
1858                sizeof(gid->global.interface_id));
1859         memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
1860         clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1861
1862         netif_addr_unlock(netdev);
1863
1864         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1865                 down_read(&priv->vlan_rwsem);
1866                 list_for_each_entry(child_priv, &priv->child_intfs, list)
1867                         set_base_guid(child_priv, gid);
1868                 up_read(&priv->vlan_rwsem);
1869         }
1870 }
1871
1872 static int ipoib_check_lladdr(struct net_device *dev,
1873                               struct sockaddr_storage *ss)
1874 {
1875         union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
1876         int ret = 0;
1877
1878         netif_addr_lock(dev);
1879
1880         /* Make sure the QPN, reserved and subnet prefix match the current
1881          * lladdr, it also makes sure the lladdr is unicast.
1882          */
1883         if (memcmp(dev->dev_addr, ss->__data,
1884                    4 + sizeof(gid->global.subnet_prefix)) ||
1885             gid->global.interface_id == 0)
1886                 ret = -EINVAL;
1887
1888         netif_addr_unlock(dev);
1889
1890         return ret;
1891 }
1892
1893 static int ipoib_set_mac(struct net_device *dev, void *addr)
1894 {
1895         struct ipoib_dev_priv *priv = netdev_priv(dev);
1896         struct sockaddr_storage *ss = addr;
1897         int ret;
1898
1899         if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
1900                 return -EBUSY;
1901
1902         ret = ipoib_check_lladdr(dev, ss);
1903         if (ret)
1904                 return ret;
1905
1906         set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
1907
1908         queue_work(ipoib_workqueue, &priv->flush_light);
1909
1910         return 0;
1911 }
1912
1913 static ssize_t create_child(struct device *dev,
1914                             struct device_attribute *attr,
1915                             const char *buf, size_t count)
1916 {
1917         int pkey;
1918         int ret;
1919
1920         if (sscanf(buf, "%i", &pkey) != 1)
1921                 return -EINVAL;
1922
1923         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1924                 return -EINVAL;
1925
1926         /*
1927          * Set the full membership bit, so that we join the right
1928          * broadcast group, etc.
1929          */
1930         pkey |= 0x8000;
1931
1932         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1933
1934         return ret ? ret : count;
1935 }
1936 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1937
1938 static ssize_t delete_child(struct device *dev,
1939                             struct device_attribute *attr,
1940                             const char *buf, size_t count)
1941 {
1942         int pkey;
1943         int ret;
1944
1945         if (sscanf(buf, "%i", &pkey) != 1)
1946                 return -EINVAL;
1947
1948         if (pkey < 0 || pkey > 0xffff)
1949                 return -EINVAL;
1950
1951         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1952
1953         return ret ? ret : count;
1954
1955 }
1956 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1957
1958 int ipoib_add_pkey_attr(struct net_device *dev)
1959 {
1960         return device_create_file(&dev->dev, &dev_attr_pkey);
1961 }
1962
1963 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1964 {
1965         priv->hca_caps = hca->attrs.device_cap_flags;
1966
1967         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1968                 priv->dev->hw_features = NETIF_F_SG |
1969                         NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1970
1971                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1972                         priv->dev->hw_features |= NETIF_F_TSO;
1973
1974                 priv->dev->features |= priv->dev->hw_features;
1975         }
1976
1977         return 0;
1978 }
1979
1980 static struct net_device *ipoib_add_port(const char *format,
1981                                          struct ib_device *hca, u8 port)
1982 {
1983         struct ipoib_dev_priv *priv;
1984         struct ib_port_attr attr;
1985         int result = -ENOMEM;
1986
1987         priv = ipoib_intf_alloc(format);
1988         if (!priv)
1989                 goto alloc_mem_failed;
1990
1991         SET_NETDEV_DEV(priv->dev, hca->dma_device);
1992         priv->dev->dev_id = port - 1;
1993
1994         result = ib_query_port(hca, port, &attr);
1995         if (!result)
1996                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1997         else {
1998                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1999                        hca->name, port);
2000                 goto device_init_failed;
2001         }
2002
2003         /* MTU will be reset when mcast join happens */
2004         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
2005         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
2006
2007         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
2008
2009         result = ib_query_pkey(hca, port, 0, &priv->pkey);
2010         if (result) {
2011                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
2012                        hca->name, port, result);
2013                 goto device_init_failed;
2014         }
2015
2016         result = ipoib_set_dev_features(priv, hca);
2017         if (result)
2018                 goto device_init_failed;
2019
2020         /*
2021          * Set the full membership bit, so that we join the right
2022          * broadcast group, etc.
2023          */
2024         priv->pkey |= 0x8000;
2025
2026         priv->dev->broadcast[8] = priv->pkey >> 8;
2027         priv->dev->broadcast[9] = priv->pkey & 0xff;
2028
2029         result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
2030         if (result) {
2031                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
2032                        hca->name, port, result);
2033                 goto device_init_failed;
2034         } else
2035                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
2036         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2037
2038         result = ipoib_dev_init(priv->dev, hca, port);
2039         if (result < 0) {
2040                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
2041                        hca->name, port, result);
2042                 goto device_init_failed;
2043         }
2044
2045         INIT_IB_EVENT_HANDLER(&priv->event_handler,
2046                               priv->ca, ipoib_event);
2047         result = ib_register_event_handler(&priv->event_handler);
2048         if (result < 0) {
2049                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
2050                        "port %d (ret = %d)\n",
2051                        hca->name, port, result);
2052                 goto event_failed;
2053         }
2054
2055         result = register_netdev(priv->dev);
2056         if (result) {
2057                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
2058                        hca->name, port, result);
2059                 goto register_failed;
2060         }
2061
2062         ipoib_create_debug_files(priv->dev);
2063
2064         if (ipoib_cm_add_mode_attr(priv->dev))
2065                 goto sysfs_failed;
2066         if (ipoib_add_pkey_attr(priv->dev))
2067                 goto sysfs_failed;
2068         if (ipoib_add_umcast_attr(priv->dev))
2069                 goto sysfs_failed;
2070         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
2071                 goto sysfs_failed;
2072         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
2073                 goto sysfs_failed;
2074
2075         return priv->dev;
2076
2077 sysfs_failed:
2078         ipoib_delete_debug_files(priv->dev);
2079         unregister_netdev(priv->dev);
2080
2081 register_failed:
2082         ib_unregister_event_handler(&priv->event_handler);
2083         flush_workqueue(ipoib_workqueue);
2084         /* Stop GC if started before flush */
2085         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2086         cancel_delayed_work(&priv->neigh_reap_task);
2087         flush_workqueue(priv->wq);
2088
2089 event_failed:
2090         ipoib_dev_cleanup(priv->dev);
2091
2092 device_init_failed:
2093         free_netdev(priv->dev);
2094
2095 alloc_mem_failed:
2096         return ERR_PTR(result);
2097 }
2098
2099 static void ipoib_add_one(struct ib_device *device)
2100 {
2101         struct list_head *dev_list;
2102         struct net_device *dev;
2103         struct ipoib_dev_priv *priv;
2104         int p;
2105         int count = 0;
2106
2107         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
2108         if (!dev_list)
2109                 return;
2110
2111         INIT_LIST_HEAD(dev_list);
2112
2113         for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
2114                 if (!rdma_protocol_ib(device, p))
2115                         continue;
2116                 dev = ipoib_add_port("ib%d", device, p);
2117                 if (!IS_ERR(dev)) {
2118                         priv = netdev_priv(dev);
2119                         list_add_tail(&priv->list, dev_list);
2120                         count++;
2121                 }
2122         }
2123
2124         if (!count) {
2125                 kfree(dev_list);
2126                 return;
2127         }
2128
2129         ib_set_client_data(device, &ipoib_client, dev_list);
2130 }
2131
2132 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2133 {
2134         struct ipoib_dev_priv *priv, *tmp;
2135         struct list_head *dev_list = client_data;
2136
2137         if (!dev_list)
2138                 return;
2139
2140         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2141                 ib_unregister_event_handler(&priv->event_handler);
2142                 flush_workqueue(ipoib_workqueue);
2143
2144                 /* mark interface in the middle of destruction */
2145                 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags);
2146
2147                 rtnl_lock();
2148                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
2149                 rtnl_unlock();
2150
2151                 /* Stop GC */
2152                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2153                 cancel_delayed_work(&priv->neigh_reap_task);
2154                 flush_workqueue(priv->wq);
2155
2156                 unregister_netdev(priv->dev);
2157                 free_netdev(priv->dev);
2158         }
2159
2160         kfree(dev_list);
2161 }
2162
2163 static int __init ipoib_init_module(void)
2164 {
2165         int ret;
2166
2167         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2168         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2169         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2170
2171         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2172         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2173         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2174 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2175         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2176 #endif
2177
2178         /*
2179          * When copying small received packets, we only copy from the
2180          * linear data part of the SKB, so we rely on this condition.
2181          */
2182         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2183
2184         ret = ipoib_register_debugfs();
2185         if (ret)
2186                 return ret;
2187
2188         /*
2189          * We create a global workqueue here that is used for all flush
2190          * operations.  However, if you attempt to flush a workqueue
2191          * from a task on that same workqueue, it deadlocks the system.
2192          * We want to be able to flush the tasks associated with a
2193          * specific net device, so we also create a workqueue for each
2194          * netdevice.  We queue up the tasks for that device only on
2195          * its private workqueue, and we only queue up flush events
2196          * on our global flush workqueue.  This avoids the deadlocks.
2197          */
2198         ipoib_workqueue = create_singlethread_workqueue("ipoib_flush");
2199         if (!ipoib_workqueue) {
2200                 ret = -ENOMEM;
2201                 goto err_fs;
2202         }
2203
2204         ib_sa_register_client(&ipoib_sa_client);
2205
2206         ret = ib_register_client(&ipoib_client);
2207         if (ret)
2208                 goto err_sa;
2209
2210         ret = ipoib_netlink_init();
2211         if (ret)
2212                 goto err_client;
2213
2214         return 0;
2215
2216 err_client:
2217         ib_unregister_client(&ipoib_client);
2218
2219 err_sa:
2220         ib_sa_unregister_client(&ipoib_sa_client);
2221         destroy_workqueue(ipoib_workqueue);
2222
2223 err_fs:
2224         ipoib_unregister_debugfs();
2225
2226         return ret;
2227 }
2228
2229 static void __exit ipoib_cleanup_module(void)
2230 {
2231         ipoib_netlink_fini();
2232         ib_unregister_client(&ipoib_client);
2233         ib_sa_unregister_client(&ipoib_sa_client);
2234         ipoib_unregister_debugfs();
2235         destroy_workqueue(ipoib_workqueue);
2236 }
2237
2238 module_init(ipoib_init_module);
2239 module_exit(ipoib_cleanup_module);