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         ipoib_ib_dev_up(dev);
 130
 131         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 132                 struct ipoib_dev_priv *cpriv;
 133
 134                 /* Bring up any child interfaces too */
 135                 down_read(&priv->vlan_rwsem);
 136                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 137                         int flags;
 138
 139                         flags = cpriv->dev->flags;
 140                         if (flags & IFF_UP)
 141                                 continue;
 142
 143                         dev_change_flags(cpriv->dev, flags | IFF_UP);
 144                 }
 145                 up_read(&priv->vlan_rwsem);
 146         }
 147
 148         netif_start_queue(dev);
 149
 150         return 0;
 151
 152 err_disable:
 153         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 154
 155         return -EINVAL;
 156 }
 157
 158 static int ipoib_stop(struct net_device *dev)
 159 {
 160         struct ipoib_dev_priv *priv = netdev_priv(dev);
 161
 162         ipoib_dbg(priv, "stopping interface\n");
 163
 164         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 165
 166         netif_stop_queue(dev);
 167
 168         ipoib_ib_dev_down(dev);
 169         ipoib_ib_dev_stop(dev);
 170
 171         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 172                 struct ipoib_dev_priv *cpriv;
 173
 174                 /* Bring down any child interfaces too */
 175                 down_read(&priv->vlan_rwsem);
 176                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
 177                         int flags;
 178
 179                         flags = cpriv->dev->flags;
 180                         if (!(flags & IFF_UP))
 181                                 continue;
 182
 183                         dev_change_flags(cpriv->dev, flags & ~IFF_UP);
 184                 }
 185                 up_read(&priv->vlan_rwsem);
 186         }
 187
 188         return 0;
 189 }
 190
 191 static void ipoib_uninit(struct net_device *dev)
 192 {
 193         ipoib_dev_cleanup(dev);
 194 }
 195
 196 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
 197 {
 198         struct ipoib_dev_priv *priv = netdev_priv(dev);
 199
 200         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
 201                 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 202
 203         return features;
 204 }
 205
 206 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 207 {
 208         struct ipoib_dev_priv *priv = netdev_priv(dev);
 209
 210         /* dev->mtu > 2K ==> connected mode */
 211         if (ipoib_cm_admin_enabled(dev)) {
 212                 if (new_mtu > ipoib_cm_max_mtu(dev))
 213                         return -EINVAL;
 214
 215                 if (new_mtu > priv->mcast_mtu)
 216                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
 217                                    priv->mcast_mtu);
 218
 219                 dev->mtu = new_mtu;
 220                 return 0;
 221         }
 222
 223         if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
 224                 return -EINVAL;
 225
 226         priv->admin_mtu = new_mtu;
 227
 228         if (priv->mcast_mtu < priv->admin_mtu)
 229                 ipoib_dbg(priv, "MTU must be smaller than the underlying "
 230                                 "link layer MTU - 4 (%u)\n", priv->mcast_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 struct ipoib_walk_data {
 296         const struct sockaddr *addr;
 297         struct net_device *result;
 298 };
 299
 300 static int ipoib_upper_walk(struct net_device *upper, void *_data)
 301 {
 302         struct ipoib_walk_data *data = _data;
 303         int ret = 0;
 304
 305         if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
 306                 dev_hold(upper);
 307                 data->result = upper;
 308                 ret = 1;
 309         }
 310
 311         return ret;
 312 }
 313
 314 /**
 315  * Find a net_device matching the given address, which is an upper device of
 316  * the given net_device.
 317  * @addr: IP address to look for.
 318  * @dev: base IPoIB net_device
 319  *
 320  * If found, returns the net_device with a reference held. Otherwise return
 321  * NULL.
 322  */
 323 static struct net_device *ipoib_get_net_dev_match_addr(
 324                 const struct sockaddr *addr, struct net_device *dev)
 325 {
 326         struct ipoib_walk_data data = {
 327                 .addr = addr,
 328         };
 329
 330         rcu_read_lock();
 331         if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
 332                 dev_hold(dev);
 333                 data.result = dev;
 334                 goto out;
 335         }
 336
 337         netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
 338 out:
 339         rcu_read_unlock();
 340         return data.result;
 341 }
 342
 343 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
 344  * pkey_index and address, if one exists.
 345  *
 346  * @found_net_dev: contains a matching net_device if the return value >= 1,
 347  * with a reference held. */
 348 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
 349                                      const union ib_gid *gid,
 350                                      u16 pkey_index,
 351                                      const struct sockaddr *addr,
 352                                      int nesting,
 353                                      struct net_device **found_net_dev)
 354 {
 355         struct ipoib_dev_priv *child_priv;
 356         struct net_device *net_dev = NULL;
 357         int matches = 0;
 358
 359         if (priv->pkey_index == pkey_index &&
 360             (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
 361                 if (!addr) {
 362                         net_dev = ipoib_get_master_net_dev(priv->dev);
 363                 } else {
 364                         /* Verify the net_device matches the IP address, as
 365                          * IPoIB child devices currently share a GID. */
 366                         net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
 367                 }
 368                 if (net_dev) {
 369                         if (!*found_net_dev)
 370                                 *found_net_dev = net_dev;
 371                         else
 372                                 dev_put(net_dev);
 373                         ++matches;
 374                 }
 375         }
 376
 377         /* Check child interfaces */
 378         down_read_nested(&priv->vlan_rwsem, nesting);
 379         list_for_each_entry(child_priv, &priv->child_intfs, list) {
 380                 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
 381                                                     pkey_index, addr,
 382                                                     nesting + 1,
 383                                                     found_net_dev);
 384                 if (matches > 1)
 385                         break;
 386         }
 387         up_read(&priv->vlan_rwsem);
 388
 389         return matches;
 390 }
 391
 392 /* Returns the number of matching net_devs found (between 0 and 2). Also
 393  * return the matching net_device in the @net_dev parameter, holding a
 394  * reference to the net_device, if the number of matches >= 1 */
 395 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
 396                                          u16 pkey_index,
 397                                          const union ib_gid *gid,
 398                                          const struct sockaddr *addr,
 399                                          struct net_device **net_dev)
 400 {
 401         struct ipoib_dev_priv *priv;
 402         int matches = 0;
 403
 404         *net_dev = NULL;
 405
 406         list_for_each_entry(priv, dev_list, list) {
 407                 if (priv->port != port)
 408                         continue;
 409
 410                 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
 411                                                      addr, 0, net_dev);
 412                 if (matches > 1)
 413                         break;
 414         }
 415
 416         return matches;
 417 }
 418
 419 static struct net_device *ipoib_get_net_dev_by_params(
 420                 struct ib_device *dev, u8 port, u16 pkey,
 421                 const union ib_gid *gid, const struct sockaddr *addr,
 422                 void *client_data)
 423 {
 424         struct net_device *net_dev;
 425         struct list_head *dev_list = client_data;
 426         u16 pkey_index;
 427         int matches;
 428         int ret;
 429
 430         if (!rdma_protocol_ib(dev, port))
 431                 return NULL;
 432
 433         ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
 434         if (ret)
 435                 return NULL;
 436
 437         if (!dev_list)
 438                 return NULL;
 439
 440         /* See if we can find a unique device matching the L2 parameters */
 441         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 442                                                 gid, NULL, &net_dev);
 443
 444         switch (matches) {
 445         case 0:
 446                 return NULL;
 447         case 1:
 448                 return net_dev;
 449         }
 450
 451         dev_put(net_dev);
 452
 453         /* Couldn't find a unique device with L2 parameters only. Use L3
 454          * address to uniquely match the net device */
 455         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
 456                                                 gid, addr, &net_dev);
 457         switch (matches) {
 458         case 0:
 459                 return NULL;
 460         default:
 461                 dev_warn_ratelimited(&dev->dev,
 462                                      "duplicate IP address detected\n");
 463                 /* Fall through */
 464         case 1:
 465                 return net_dev;
 466         }
 467 }
 468
 469 int ipoib_set_mode(struct net_device *dev, const char *buf)
 470 {
 471         struct ipoib_dev_priv *priv = netdev_priv(dev);
 472
 473         if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
 474              !strcmp(buf, "connected\n")) ||
 475              (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
 476              !strcmp(buf, "datagram\n"))) {
 477                 return 0;
 478         }
 479
 480         /* flush paths if we switch modes so that connections are restarted */
 481         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
 482                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 483                 ipoib_warn(priv, "enabling connected mode "
 484                            "will cause multicast packet drops\n");
 485                 netdev_update_features(dev);
 486                 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
 487                 rtnl_unlock();
 488                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 489
 490                 ipoib_flush_paths(dev);
 491                 return (!rtnl_trylock()) ? -EBUSY : 0;
 492         }
 493
 494         if (!strcmp(buf, "datagram\n")) {
 495                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 496                 netdev_update_features(dev);
 497                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 498                 rtnl_unlock();
 499                 ipoib_flush_paths(dev);
 500                 return (!rtnl_trylock()) ? -EBUSY : 0;
 501         }
 502
 503         return -EINVAL;
 504 }
 505
 506 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
 507 {
 508         struct ipoib_dev_priv *priv = netdev_priv(dev);
 509         struct rb_node *n = priv->path_tree.rb_node;
 510         struct ipoib_path *path;
 511         int ret;
 512
 513         while (n) {
 514                 path = rb_entry(n, struct ipoib_path, rb_node);
 515
 516                 ret = memcmp(gid, path->pathrec.dgid.raw,
 517                              sizeof (union ib_gid));
 518
 519                 if (ret < 0)
 520                         n = n->rb_left;
 521                 else if (ret > 0)
 522                         n = n->rb_right;
 523                 else
 524                         return path;
 525         }
 526
 527         return NULL;
 528 }
 529
 530 static int __path_add(struct net_device *dev, struct ipoib_path *path)
 531 {
 532         struct ipoib_dev_priv *priv = netdev_priv(dev);
 533         struct rb_node **n = &priv->path_tree.rb_node;
 534         struct rb_node *pn = NULL;
 535         struct ipoib_path *tpath;
 536         int ret;
 537
 538         while (*n) {
 539                 pn = *n;
 540                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
 541
 542                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
 543                              sizeof (union ib_gid));
 544                 if (ret < 0)
 545                         n = &pn->rb_left;
 546                 else if (ret > 0)
 547                         n = &pn->rb_right;
 548                 else
 549                         return -EEXIST;
 550         }
 551
 552         rb_link_node(&path->rb_node, pn, n);
 553         rb_insert_color(&path->rb_node, &priv->path_tree);
 554
 555         list_add_tail(&path->list, &priv->path_list);
 556
 557         return 0;
 558 }
 559
 560 static void path_free(struct net_device *dev, struct ipoib_path *path)
 561 {
 562         struct sk_buff *skb;
 563
 564         while ((skb = __skb_dequeue(&path->queue)))
 565                 dev_kfree_skb_irq(skb);
 566
 567         ipoib_dbg(netdev_priv(dev), "path_free\n");
 568
 569         /* remove all neigh connected to this path */
 570         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 571
 572         if (path->ah)
 573                 ipoib_put_ah(path->ah);
 574
 575         kfree(path);
 576 }
 577
 578 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 579
 580 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
 581 {
 582         struct ipoib_path_iter *iter;
 583
 584         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 585         if (!iter)
 586                 return NULL;
 587
 588         iter->dev = dev;
 589         memset(iter->path.pathrec.dgid.raw, 0, 16);
 590
 591         if (ipoib_path_iter_next(iter)) {
 592                 kfree(iter);
 593                 return NULL;
 594         }
 595
 596         return iter;
 597 }
 598
 599 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
 600 {
 601         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 602         struct rb_node *n;
 603         struct ipoib_path *path;
 604         int ret = 1;
 605
 606         spin_lock_irq(&priv->lock);
 607
 608         n = rb_first(&priv->path_tree);
 609
 610         while (n) {
 611                 path = rb_entry(n, struct ipoib_path, rb_node);
 612
 613                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
 614                            sizeof (union ib_gid)) < 0) {
 615                         iter->path = *path;
 616                         ret = 0;
 617                         break;
 618                 }
 619
 620                 n = rb_next(n);
 621         }
 622
 623         spin_unlock_irq(&priv->lock);
 624
 625         return ret;
 626 }
 627
 628 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 629                           struct ipoib_path *path)
 630 {
 631         *path = iter->path;
 632 }
 633
 634 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
 635
 636 void ipoib_mark_paths_invalid(struct net_device *dev)
 637 {
 638         struct ipoib_dev_priv *priv = netdev_priv(dev);
 639         struct ipoib_path *path, *tp;
 640
 641         spin_lock_irq(&priv->lock);
 642
 643         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
 644                 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
 645                         be16_to_cpu(path->pathrec.dlid),
 646                         path->pathrec.dgid.raw);
 647                 path->valid =  0;
 648         }
 649
 650         spin_unlock_irq(&priv->lock);
 651 }
 652
 653 struct classport_info_context {
 654         struct ipoib_dev_priv   *priv;
 655         struct completion       done;
 656         struct ib_sa_query      *sa_query;
 657 };
 658
 659 static void classport_info_query_cb(int status, struct ib_class_port_info *rec,
 660                                     void *context)
 661 {
 662         struct classport_info_context *cb_ctx = context;
 663         struct ipoib_dev_priv *priv;
 664
 665         WARN_ON(!context);
 666
 667         priv = cb_ctx->priv;
 668
 669         if (status || !rec) {
 670                 pr_debug("device: %s failed query classport_info status: %d\n",
 671                          priv->dev->name, status);
 672                 /* keeps the default, will try next mcast_restart */
 673                 priv->sm_fullmember_sendonly_support = false;
 674                 goto out;
 675         }
 676
 677         if (ib_get_cpi_capmask2(rec) &
 678             IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT) {
 679                 pr_debug("device: %s enabled fullmember-sendonly for sendonly MCG\n",
 680                          priv->dev->name);
 681                 priv->sm_fullmember_sendonly_support = true;
 682         } else {
 683                 pr_debug("device: %s disabled fullmember-sendonly for sendonly MCG\n",
 684                          priv->dev->name);
 685                 priv->sm_fullmember_sendonly_support = false;
 686         }
 687
 688 out:
 689         complete(&cb_ctx->done);
 690 }
 691
 692 int ipoib_check_sm_sendonly_fullmember_support(struct ipoib_dev_priv *priv)
 693 {
 694         struct classport_info_context *callback_context;
 695         int ret;
 696
 697         callback_context = kmalloc(sizeof(*callback_context), GFP_KERNEL);
 698         if (!callback_context)
 699                 return -ENOMEM;
 700
 701         callback_context->priv = priv;
 702         init_completion(&callback_context->done);
 703
 704         ret = ib_sa_classport_info_rec_query(&ipoib_sa_client,
 705                                              priv->ca, priv->port, 3000,
 706                                              GFP_KERNEL,
 707                                              classport_info_query_cb,
 708                                              callback_context,
 709                                              &callback_context->sa_query);
 710         if (ret < 0) {
 711                 pr_info("%s failed to send ib_sa_classport_info query, ret: %d\n",
 712                         priv->dev->name, ret);
 713                 kfree(callback_context);
 714                 return ret;
 715         }
 716
 717         /* waiting for the callback to finish before returnning */
 718         wait_for_completion(&callback_context->done);
 719         kfree(callback_context);
 720
 721         return ret;
 722 }
 723
 724 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
 725 {
 726         struct ipoib_pseudo_header *phdr;
 727
 728         phdr = (struct ipoib_pseudo_header *)skb_push(skb, sizeof(*phdr));
 729         memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
 730 }
 731
 732 void ipoib_flush_paths(struct net_device *dev)
 733 {
 734         struct ipoib_dev_priv *priv = netdev_priv(dev);
 735         struct ipoib_path *path, *tp;
 736         LIST_HEAD(remove_list);
 737         unsigned long flags;
 738
 739         netif_tx_lock_bh(dev);
 740         spin_lock_irqsave(&priv->lock, flags);
 741
 742         list_splice_init(&priv->path_list, &remove_list);
 743
 744         list_for_each_entry(path, &remove_list, list)
 745                 rb_erase(&path->rb_node, &priv->path_tree);
 746
 747         list_for_each_entry_safe(path, tp, &remove_list, list) {
 748                 if (path->query)
 749                         ib_sa_cancel_query(path->query_id, path->query);
 750                 spin_unlock_irqrestore(&priv->lock, flags);
 751                 netif_tx_unlock_bh(dev);
 752                 wait_for_completion(&path->done);
 753                 path_free(dev, path);
 754                 netif_tx_lock_bh(dev);
 755                 spin_lock_irqsave(&priv->lock, flags);
 756         }
 757
 758         spin_unlock_irqrestore(&priv->lock, flags);
 759         netif_tx_unlock_bh(dev);
 760 }
 761
 762 static void path_rec_completion(int status,
 763                                 struct ib_sa_path_rec *pathrec,
 764                                 void *path_ptr)
 765 {
 766         struct ipoib_path *path = path_ptr;
 767         struct net_device *dev = path->dev;
 768         struct ipoib_dev_priv *priv = netdev_priv(dev);
 769         struct ipoib_ah *ah = NULL;
 770         struct ipoib_ah *old_ah = NULL;
 771         struct ipoib_neigh *neigh, *tn;
 772         struct sk_buff_head skqueue;
 773         struct sk_buff *skb;
 774         unsigned long flags;
 775
 776         if (!status)
 777                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
 778                           be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
 779         else
 780                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
 781                           status, path->pathrec.dgid.raw);
 782
 783         skb_queue_head_init(&skqueue);
 784
 785         if (!status) {
 786                 struct ib_ah_attr av;
 787
 788                 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
 789                         ah = ipoib_create_ah(dev, priv->pd, &av);
 790         }
 791
 792         spin_lock_irqsave(&priv->lock, flags);
 793
 794         if (!IS_ERR_OR_NULL(ah)) {
 795                 path->pathrec = *pathrec;
 796
 797                 old_ah   = path->ah;
 798                 path->ah = ah;
 799
 800                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
 801                           ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
 802
 803                 while ((skb = __skb_dequeue(&path->queue)))
 804                         __skb_queue_tail(&skqueue, skb);
 805
 806                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
 807                         if (neigh->ah) {
 808                                 WARN_ON(neigh->ah != old_ah);
 809                                 /*
 810                                  * Dropping the ah reference inside
 811                                  * priv->lock is safe here, because we
 812                                  * will hold one more reference from
 813                                  * the original value of path->ah (ie
 814                                  * old_ah).
 815                                  */
 816                                 ipoib_put_ah(neigh->ah);
 817                         }
 818                         kref_get(&path->ah->ref);
 819                         neigh->ah = path->ah;
 820
 821                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
 822                                 if (!ipoib_cm_get(neigh))
 823                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
 824                                                                                path,
 825                                                                                neigh));
 826                                 if (!ipoib_cm_get(neigh)) {
 827                                         ipoib_neigh_free(neigh);
 828                                         continue;
 829                                 }
 830                         }
 831
 832                         while ((skb = __skb_dequeue(&neigh->queue)))
 833                                 __skb_queue_tail(&skqueue, skb);
 834                 }
 835                 path->valid = 1;
 836         }
 837
 838         path->query = NULL;
 839         complete(&path->done);
 840
 841         spin_unlock_irqrestore(&priv->lock, flags);
 842
 843         if (IS_ERR_OR_NULL(ah))
 844                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
 845
 846         if (old_ah)
 847                 ipoib_put_ah(old_ah);
 848
 849         while ((skb = __skb_dequeue(&skqueue))) {
 850                 int ret;
 851                 skb->dev = dev;
 852                 ret = dev_queue_xmit(skb);
 853                 if (ret)
 854                         ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
 855                                    __func__, ret);
 856         }
 857 }
 858
 859 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 860 {
 861         struct ipoib_dev_priv *priv = netdev_priv(dev);
 862         struct ipoib_path *path;
 863
 864         if (!priv->broadcast)
 865                 return NULL;
 866
 867         path = kzalloc(sizeof *path, GFP_ATOMIC);
 868         if (!path)
 869                 return NULL;
 870
 871         path->dev = dev;
 872
 873         skb_queue_head_init(&path->queue);
 874
 875         INIT_LIST_HEAD(&path->neigh_list);
 876
 877         memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
 878         path->pathrec.sgid          = priv->local_gid;
 879         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
 880         path->pathrec.numb_path     = 1;
 881         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
 882
 883         return path;
 884 }
 885
 886 static int path_rec_start(struct net_device *dev,
 887                           struct ipoib_path *path)
 888 {
 889         struct ipoib_dev_priv *priv = netdev_priv(dev);
 890
 891         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
 892                   path->pathrec.dgid.raw);
 893
 894         init_completion(&path->done);
 895
 896         path->query_id =
 897                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
 898                                    &path->pathrec,
 899                                    IB_SA_PATH_REC_DGID          |
 900                                    IB_SA_PATH_REC_SGID          |
 901                                    IB_SA_PATH_REC_NUMB_PATH     |
 902                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
 903                                    IB_SA_PATH_REC_PKEY,
 904                                    1000, GFP_ATOMIC,
 905                                    path_rec_completion,
 906                                    path, &path->query);
 907         if (path->query_id < 0) {
 908                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
 909                 path->query = NULL;
 910                 complete(&path->done);
 911                 return path->query_id;
 912         }
 913
 914         return 0;
 915 }
 916
 917 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
 918                            struct net_device *dev)
 919 {
 920         struct ipoib_dev_priv *priv = netdev_priv(dev);
 921         struct ipoib_path *path;
 922         struct ipoib_neigh *neigh;
 923         unsigned long flags;
 924
 925         spin_lock_irqsave(&priv->lock, flags);
 926         neigh = ipoib_neigh_alloc(daddr, dev);
 927         if (!neigh) {
 928                 spin_unlock_irqrestore(&priv->lock, flags);
 929                 ++dev->stats.tx_dropped;
 930                 dev_kfree_skb_any(skb);
 931                 return;
 932         }
 933
 934         path = __path_find(dev, daddr + 4);
 935         if (!path) {
 936                 path = path_rec_create(dev, daddr + 4);
 937                 if (!path)
 938                         goto err_path;
 939
 940                 __path_add(dev, path);
 941         }
 942
 943         list_add_tail(&neigh->list, &path->neigh_list);
 944
 945         if (path->ah) {
 946                 kref_get(&path->ah->ref);
 947                 neigh->ah = path->ah;
 948
 949                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
 950                         if (!ipoib_cm_get(neigh))
 951                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
 952                         if (!ipoib_cm_get(neigh)) {
 953                                 ipoib_neigh_free(neigh);
 954                                 goto err_drop;
 955                         }
 956                         if (skb_queue_len(&neigh->queue) <
 957                             IPOIB_MAX_PATH_REC_QUEUE) {
 958                                 push_pseudo_header(skb, neigh->daddr);
 959                                 __skb_queue_tail(&neigh->queue, skb);
 960                         } else {
 961                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
 962                                            skb_queue_len(&neigh->queue));
 963                                 goto err_drop;
 964                         }
 965                 } else {
 966                         spin_unlock_irqrestore(&priv->lock, flags);
 967                         ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
 968                         ipoib_neigh_put(neigh);
 969                         return;
 970                 }
 971         } else {
 972                 neigh->ah  = NULL;
 973
 974                 if (!path->query && path_rec_start(dev, path))
 975                         goto err_path;
 976                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
 977                         push_pseudo_header(skb, neigh->daddr);
 978                         __skb_queue_tail(&neigh->queue, skb);
 979                 } else {
 980                         goto err_drop;
 981                 }
 982         }
 983
 984         spin_unlock_irqrestore(&priv->lock, flags);
 985         ipoib_neigh_put(neigh);
 986         return;
 987
 988 err_path:
 989         ipoib_neigh_free(neigh);
 990 err_drop:
 991         ++dev->stats.tx_dropped;
 992         dev_kfree_skb_any(skb);
 993
 994         spin_unlock_irqrestore(&priv->lock, flags);
 995         ipoib_neigh_put(neigh);
 996 }
 997
 998 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
 999                              struct ipoib_pseudo_header *phdr)
1000 {
1001         struct ipoib_dev_priv *priv = netdev_priv(dev);
1002         struct ipoib_path *path;
1003         unsigned long flags;
1004
1005         spin_lock_irqsave(&priv->lock, flags);
1006
1007         path = __path_find(dev, phdr->hwaddr + 4);
1008         if (!path || !path->valid) {
1009                 int new_path = 0;
1010
1011                 if (!path) {
1012                         path = path_rec_create(dev, phdr->hwaddr + 4);
1013                         new_path = 1;
1014                 }
1015                 if (path) {
1016                         if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1017                                 push_pseudo_header(skb, phdr->hwaddr);
1018                                 __skb_queue_tail(&path->queue, skb);
1019                         } else {
1020                                 ++dev->stats.tx_dropped;
1021                                 dev_kfree_skb_any(skb);
1022                         }
1023
1024                         if (!path->query && path_rec_start(dev, path)) {
1025                                 spin_unlock_irqrestore(&priv->lock, flags);
1026                                 if (new_path)
1027                                         path_free(dev, path);
1028                                 return;
1029                         } else
1030                                 __path_add(dev, path);
1031                 } else {
1032                         ++dev->stats.tx_dropped;
1033                         dev_kfree_skb_any(skb);
1034                 }
1035
1036                 spin_unlock_irqrestore(&priv->lock, flags);
1037                 return;
1038         }
1039
1040         if (path->ah) {
1041                 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
1042                           be16_to_cpu(path->pathrec.dlid));
1043
1044                 spin_unlock_irqrestore(&priv->lock, flags);
1045                 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
1046                 return;
1047         } else if ((path->query || !path_rec_start(dev, path)) &&
1048                    skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1049                 push_pseudo_header(skb, phdr->hwaddr);
1050                 __skb_queue_tail(&path->queue, skb);
1051         } else {
1052                 ++dev->stats.tx_dropped;
1053                 dev_kfree_skb_any(skb);
1054         }
1055
1056         spin_unlock_irqrestore(&priv->lock, flags);
1057 }
1058
1059 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1060 {
1061         struct ipoib_dev_priv *priv = netdev_priv(dev);
1062         struct ipoib_neigh *neigh;
1063         struct ipoib_pseudo_header *phdr;
1064         struct ipoib_header *header;
1065         unsigned long flags;
1066
1067         phdr = (struct ipoib_pseudo_header *) skb->data;
1068         skb_pull(skb, sizeof(*phdr));
1069         header = (struct ipoib_header *) skb->data;
1070
1071         if (unlikely(phdr->hwaddr[4] == 0xff)) {
1072                 /* multicast, arrange "if" according to probability */
1073                 if ((header->proto != htons(ETH_P_IP)) &&
1074                     (header->proto != htons(ETH_P_IPV6)) &&
1075                     (header->proto != htons(ETH_P_ARP)) &&
1076                     (header->proto != htons(ETH_P_RARP)) &&
1077                     (header->proto != htons(ETH_P_TIPC))) {
1078                         /* ethertype not supported by IPoIB */
1079                         ++dev->stats.tx_dropped;
1080                         dev_kfree_skb_any(skb);
1081                         return NETDEV_TX_OK;
1082                 }
1083                 /* Add in the P_Key for multicast*/
1084                 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1085                 phdr->hwaddr[9] = priv->pkey & 0xff;
1086
1087                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1088                 if (likely(neigh))
1089                         goto send_using_neigh;
1090                 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1091                 return NETDEV_TX_OK;
1092         }
1093
1094         /* unicast, arrange "switch" according to probability */
1095         switch (header->proto) {
1096         case htons(ETH_P_IP):
1097         case htons(ETH_P_IPV6):
1098         case htons(ETH_P_TIPC):
1099                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1100                 if (unlikely(!neigh)) {
1101                         neigh_add_path(skb, phdr->hwaddr, dev);
1102                         return NETDEV_TX_OK;
1103                 }
1104                 break;
1105         case htons(ETH_P_ARP):
1106         case htons(ETH_P_RARP):
1107                 /* for unicast ARP and RARP should always perform path find */
1108                 unicast_arp_send(skb, dev, phdr);
1109                 return NETDEV_TX_OK;
1110         default:
1111                 /* ethertype not supported by IPoIB */
1112                 ++dev->stats.tx_dropped;
1113                 dev_kfree_skb_any(skb);
1114                 return NETDEV_TX_OK;
1115         }
1116
1117 send_using_neigh:
1118         /* note we now hold a ref to neigh */
1119         if (ipoib_cm_get(neigh)) {
1120                 if (ipoib_cm_up(neigh)) {
1121                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1122                         goto unref;
1123                 }
1124         } else if (neigh->ah) {
1125                 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(phdr->hwaddr));
1126                 goto unref;
1127         }
1128
1129         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1130                 push_pseudo_header(skb, phdr->hwaddr);
1131                 spin_lock_irqsave(&priv->lock, flags);
1132                 __skb_queue_tail(&neigh->queue, skb);
1133                 spin_unlock_irqrestore(&priv->lock, flags);
1134         } else {
1135                 ++dev->stats.tx_dropped;
1136                 dev_kfree_skb_any(skb);
1137         }
1138
1139 unref:
1140         ipoib_neigh_put(neigh);
1141
1142         return NETDEV_TX_OK;
1143 }
1144
1145 static void ipoib_timeout(struct net_device *dev)
1146 {
1147         struct ipoib_dev_priv *priv = netdev_priv(dev);
1148
1149         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1150                    jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1151         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1152                    netif_queue_stopped(dev),
1153                    priv->tx_head, priv->tx_tail);
1154         /* XXX reset QP, etc. */
1155 }
1156
1157 static int ipoib_hard_header(struct sk_buff *skb,
1158                              struct net_device *dev,
1159                              unsigned short type,
1160                              const void *daddr, const void *saddr, unsigned len)
1161 {
1162         struct ipoib_header *header;
1163
1164         header = (struct ipoib_header *) skb_push(skb, sizeof *header);
1165
1166         header->proto = htons(type);
1167         header->reserved = 0;
1168
1169         /*
1170          * we don't rely on dst_entry structure,  always stuff the
1171          * destination address into skb hard header so we can figure out where
1172          * to send the packet later.
1173          */
1174         push_pseudo_header(skb, daddr);
1175
1176         return IPOIB_HARD_LEN;
1177 }
1178
1179 static void ipoib_set_mcast_list(struct net_device *dev)
1180 {
1181         struct ipoib_dev_priv *priv = netdev_priv(dev);
1182
1183         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1184                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1185                 return;
1186         }
1187
1188         queue_work(priv->wq, &priv->restart_task);
1189 }
1190
1191 static int ipoib_get_iflink(const struct net_device *dev)
1192 {
1193         struct ipoib_dev_priv *priv = netdev_priv(dev);
1194
1195         /* parent interface */
1196         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1197                 return dev->ifindex;
1198
1199         /* child/vlan interface */
1200         return priv->parent->ifindex;
1201 }
1202
1203 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1204 {
1205         /*
1206          * Use only the address parts that contributes to spreading
1207          * The subnet prefix is not used as one can not connect to
1208          * same remote port (GUID) using the same remote QPN via two
1209          * different subnets.
1210          */
1211          /* qpn octets[1:4) & port GUID octets[12:20) */
1212         u32 *d32 = (u32 *) daddr;
1213         u32 hv;
1214
1215         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1216         return hv & htbl->mask;
1217 }
1218
1219 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1220 {
1221         struct ipoib_dev_priv *priv = netdev_priv(dev);
1222         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1223         struct ipoib_neigh_hash *htbl;
1224         struct ipoib_neigh *neigh = NULL;
1225         u32 hash_val;
1226
1227         rcu_read_lock_bh();
1228
1229         htbl = rcu_dereference_bh(ntbl->htbl);
1230
1231         if (!htbl)
1232                 goto out_unlock;
1233
1234         hash_val = ipoib_addr_hash(htbl, daddr);
1235         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1236              neigh != NULL;
1237              neigh = rcu_dereference_bh(neigh->hnext)) {
1238                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1239                         /* found, take one ref on behalf of the caller */
1240                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1241                                 /* deleted */
1242                                 neigh = NULL;
1243                                 goto out_unlock;
1244                         }
1245
1246                         if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1247                                 neigh->alive = jiffies;
1248                         goto out_unlock;
1249                 }
1250         }
1251
1252 out_unlock:
1253         rcu_read_unlock_bh();
1254         return neigh;
1255 }
1256
1257 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1258 {
1259         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1260         struct ipoib_neigh_hash *htbl;
1261         unsigned long neigh_obsolete;
1262         unsigned long dt;
1263         unsigned long flags;
1264         int i;
1265         LIST_HEAD(remove_list);
1266
1267         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1268                 return;
1269
1270         spin_lock_irqsave(&priv->lock, flags);
1271
1272         htbl = rcu_dereference_protected(ntbl->htbl,
1273                                          lockdep_is_held(&priv->lock));
1274
1275         if (!htbl)
1276                 goto out_unlock;
1277
1278         /* neigh is obsolete if it was idle for two GC periods */
1279         dt = 2 * arp_tbl.gc_interval;
1280         neigh_obsolete = jiffies - dt;
1281         /* handle possible race condition */
1282         if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1283                 goto out_unlock;
1284
1285         for (i = 0; i < htbl->size; i++) {
1286                 struct ipoib_neigh *neigh;
1287                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1288
1289                 while ((neigh = rcu_dereference_protected(*np,
1290                                                           lockdep_is_held(&priv->lock))) != NULL) {
1291                         /* was the neigh idle for two GC periods */
1292                         if (time_after(neigh_obsolete, neigh->alive)) {
1293
1294                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1295
1296                                 rcu_assign_pointer(*np,
1297                                                    rcu_dereference_protected(neigh->hnext,
1298                                                                              lockdep_is_held(&priv->lock)));
1299                                 /* remove from path/mc list */
1300                                 list_del_init(&neigh->list);
1301                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1302                         } else {
1303                                 np = &neigh->hnext;
1304                         }
1305
1306                 }
1307         }
1308
1309 out_unlock:
1310         spin_unlock_irqrestore(&priv->lock, flags);
1311         ipoib_mcast_remove_list(&remove_list);
1312 }
1313
1314 static void ipoib_reap_neigh(struct work_struct *work)
1315 {
1316         struct ipoib_dev_priv *priv =
1317                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1318
1319         __ipoib_reap_neigh(priv);
1320
1321         if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1322                 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1323                                    arp_tbl.gc_interval);
1324 }
1325
1326
1327 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1328                                       struct net_device *dev)
1329 {
1330         struct ipoib_neigh *neigh;
1331
1332         neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1333         if (!neigh)
1334                 return NULL;
1335
1336         neigh->dev = dev;
1337         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1338         skb_queue_head_init(&neigh->queue);
1339         INIT_LIST_HEAD(&neigh->list);
1340         ipoib_cm_set(neigh, NULL);
1341         /* one ref on behalf of the caller */
1342         atomic_set(&neigh->refcnt, 1);
1343
1344         return neigh;
1345 }
1346
1347 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1348                                       struct net_device *dev)
1349 {
1350         struct ipoib_dev_priv *priv = netdev_priv(dev);
1351         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1352         struct ipoib_neigh_hash *htbl;
1353         struct ipoib_neigh *neigh;
1354         u32 hash_val;
1355
1356         htbl = rcu_dereference_protected(ntbl->htbl,
1357                                          lockdep_is_held(&priv->lock));
1358         if (!htbl) {
1359                 neigh = NULL;
1360                 goto out_unlock;
1361         }
1362
1363         /* need to add a new neigh, but maybe some other thread succeeded?
1364          * recalc hash, maybe hash resize took place so we do a search
1365          */
1366         hash_val = ipoib_addr_hash(htbl, daddr);
1367         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1368                                                lockdep_is_held(&priv->lock));
1369              neigh != NULL;
1370              neigh = rcu_dereference_protected(neigh->hnext,
1371                                                lockdep_is_held(&priv->lock))) {
1372                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1373                         /* found, take one ref on behalf of the caller */
1374                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1375                                 /* deleted */
1376                                 neigh = NULL;
1377                                 break;
1378                         }
1379                         neigh->alive = jiffies;
1380                         goto out_unlock;
1381                 }
1382         }
1383
1384         neigh = ipoib_neigh_ctor(daddr, dev);
1385         if (!neigh)
1386                 goto out_unlock;
1387
1388         /* one ref on behalf of the hash table */
1389         atomic_inc(&neigh->refcnt);
1390         neigh->alive = jiffies;
1391         /* put in hash */
1392         rcu_assign_pointer(neigh->hnext,
1393                            rcu_dereference_protected(htbl->buckets[hash_val],
1394                                                      lockdep_is_held(&priv->lock)));
1395         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1396         atomic_inc(&ntbl->entries);
1397
1398 out_unlock:
1399
1400         return neigh;
1401 }
1402
1403 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1404 {
1405         /* neigh reference count was dropprd to zero */
1406         struct net_device *dev = neigh->dev;
1407         struct ipoib_dev_priv *priv = netdev_priv(dev);
1408         struct sk_buff *skb;
1409         if (neigh->ah)
1410                 ipoib_put_ah(neigh->ah);
1411         while ((skb = __skb_dequeue(&neigh->queue))) {
1412                 ++dev->stats.tx_dropped;
1413                 dev_kfree_skb_any(skb);
1414         }
1415         if (ipoib_cm_get(neigh))
1416                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1417         ipoib_dbg(netdev_priv(dev),
1418                   "neigh free for %06x %pI6\n",
1419                   IPOIB_QPN(neigh->daddr),
1420                   neigh->daddr + 4);
1421         kfree(neigh);
1422         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1423                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1424                         complete(&priv->ntbl.flushed);
1425         }
1426 }
1427
1428 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1429 {
1430         /* Called as a result of removal from hash table */
1431         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1432         /* note TX context may hold another ref */
1433         ipoib_neigh_put(neigh);
1434 }
1435
1436 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1437 {
1438         struct net_device *dev = neigh->dev;
1439         struct ipoib_dev_priv *priv = netdev_priv(dev);
1440         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1441         struct ipoib_neigh_hash *htbl;
1442         struct ipoib_neigh __rcu **np;
1443         struct ipoib_neigh *n;
1444         u32 hash_val;
1445
1446         htbl = rcu_dereference_protected(ntbl->htbl,
1447                                         lockdep_is_held(&priv->lock));
1448         if (!htbl)
1449                 return;
1450
1451         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1452         np = &htbl->buckets[hash_val];
1453         for (n = rcu_dereference_protected(*np,
1454                                             lockdep_is_held(&priv->lock));
1455              n != NULL;
1456              n = rcu_dereference_protected(*np,
1457                                         lockdep_is_held(&priv->lock))) {
1458                 if (n == neigh) {
1459                         /* found */
1460                         rcu_assign_pointer(*np,
1461                                            rcu_dereference_protected(neigh->hnext,
1462                                                                      lockdep_is_held(&priv->lock)));
1463                         /* remove from parent list */
1464                         list_del_init(&neigh->list);
1465                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1466                         return;
1467                 } else {
1468                         np = &n->hnext;
1469                 }
1470         }
1471 }
1472
1473 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1474 {
1475         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1476         struct ipoib_neigh_hash *htbl;
1477         struct ipoib_neigh __rcu **buckets;
1478         u32 size;
1479
1480         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1481         ntbl->htbl = NULL;
1482         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1483         if (!htbl)
1484                 return -ENOMEM;
1485         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1486         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1487         buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1488         if (!buckets) {
1489                 kfree(htbl);
1490                 return -ENOMEM;
1491         }
1492         htbl->size = size;
1493         htbl->mask = (size - 1);
1494         htbl->buckets = buckets;
1495         RCU_INIT_POINTER(ntbl->htbl, htbl);
1496         htbl->ntbl = ntbl;
1497         atomic_set(&ntbl->entries, 0);
1498
1499         /* start garbage collection */
1500         clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1501         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1502                            arp_tbl.gc_interval);
1503
1504         return 0;
1505 }
1506
1507 static void neigh_hash_free_rcu(struct rcu_head *head)
1508 {
1509         struct ipoib_neigh_hash *htbl = container_of(head,
1510                                                     struct ipoib_neigh_hash,
1511                                                     rcu);
1512         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1513         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1514
1515         kfree(buckets);
1516         kfree(htbl);
1517         complete(&ntbl->deleted);
1518 }
1519
1520 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1521 {
1522         struct ipoib_dev_priv *priv = netdev_priv(dev);
1523         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1524         struct ipoib_neigh_hash *htbl;
1525         unsigned long flags;
1526         int i;
1527
1528         /* remove all neigh connected to a given path or mcast */
1529         spin_lock_irqsave(&priv->lock, flags);
1530
1531         htbl = rcu_dereference_protected(ntbl->htbl,
1532                                          lockdep_is_held(&priv->lock));
1533
1534         if (!htbl)
1535                 goto out_unlock;
1536
1537         for (i = 0; i < htbl->size; i++) {
1538                 struct ipoib_neigh *neigh;
1539                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1540
1541                 while ((neigh = rcu_dereference_protected(*np,
1542                                                           lockdep_is_held(&priv->lock))) != NULL) {
1543                         /* delete neighs belong to this parent */
1544                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1545                                 rcu_assign_pointer(*np,
1546                                                    rcu_dereference_protected(neigh->hnext,
1547                                                                              lockdep_is_held(&priv->lock)));
1548                                 /* remove from parent list */
1549                                 list_del_init(&neigh->list);
1550                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1551                         } else {
1552                                 np = &neigh->hnext;
1553                         }
1554
1555                 }
1556         }
1557 out_unlock:
1558         spin_unlock_irqrestore(&priv->lock, flags);
1559 }
1560
1561 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1562 {
1563         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1564         struct ipoib_neigh_hash *htbl;
1565         unsigned long flags;
1566         int i, wait_flushed = 0;
1567
1568         init_completion(&priv->ntbl.flushed);
1569
1570         spin_lock_irqsave(&priv->lock, flags);
1571
1572         htbl = rcu_dereference_protected(ntbl->htbl,
1573                                         lockdep_is_held(&priv->lock));
1574         if (!htbl)
1575                 goto out_unlock;
1576
1577         wait_flushed = atomic_read(&priv->ntbl.entries);
1578         if (!wait_flushed)
1579                 goto free_htbl;
1580
1581         for (i = 0; i < htbl->size; i++) {
1582                 struct ipoib_neigh *neigh;
1583                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1584
1585                 while ((neigh = rcu_dereference_protected(*np,
1586                                        lockdep_is_held(&priv->lock))) != NULL) {
1587                         rcu_assign_pointer(*np,
1588                                            rcu_dereference_protected(neigh->hnext,
1589                                                                      lockdep_is_held(&priv->lock)));
1590                         /* remove from path/mc list */
1591                         list_del_init(&neigh->list);
1592                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1593                 }
1594         }
1595
1596 free_htbl:
1597         rcu_assign_pointer(ntbl->htbl, NULL);
1598         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1599
1600 out_unlock:
1601         spin_unlock_irqrestore(&priv->lock, flags);
1602         if (wait_flushed)
1603                 wait_for_completion(&priv->ntbl.flushed);
1604 }
1605
1606 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1607 {
1608         struct ipoib_dev_priv *priv = netdev_priv(dev);
1609         int stopped;
1610
1611         ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1612         init_completion(&priv->ntbl.deleted);
1613         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1614
1615         /* Stop GC if called at init fail need to cancel work */
1616         stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1617         if (!stopped)
1618                 cancel_delayed_work(&priv->neigh_reap_task);
1619
1620         ipoib_flush_neighs(priv);
1621
1622         wait_for_completion(&priv->ntbl.deleted);
1623 }
1624
1625
1626 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1627 {
1628         struct ipoib_dev_priv *priv = netdev_priv(dev);
1629
1630         /* Allocate RX/TX "rings" to hold queued skbs */
1631         priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1632                                 GFP_KERNEL);
1633         if (!priv->rx_ring)
1634                 goto out;
1635
1636         priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1637         if (!priv->tx_ring) {
1638                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1639                        ca->name, ipoib_sendq_size);
1640                 goto out_rx_ring_cleanup;
1641         }
1642
1643         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1644
1645         if (ipoib_ib_dev_init(dev, ca, port))
1646                 goto out_tx_ring_cleanup;
1647
1648         /*
1649          * Must be after ipoib_ib_dev_init so we can allocate a per
1650          * device wq there and use it here
1651          */
1652         if (ipoib_neigh_hash_init(priv) < 0)
1653                 goto out_dev_uninit;
1654
1655         return 0;
1656
1657 out_dev_uninit:
1658         ipoib_ib_dev_cleanup(dev);
1659
1660 out_tx_ring_cleanup:
1661         vfree(priv->tx_ring);
1662
1663 out_rx_ring_cleanup:
1664         kfree(priv->rx_ring);
1665
1666 out:
1667         return -ENOMEM;
1668 }
1669
1670 void ipoib_dev_cleanup(struct net_device *dev)
1671 {
1672         struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1673         LIST_HEAD(head);
1674
1675         ASSERT_RTNL();
1676
1677         ipoib_delete_debug_files(dev);
1678
1679         /* Delete any child interfaces first */
1680         list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1681                 /* Stop GC on child */
1682                 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1683                 cancel_delayed_work(&cpriv->neigh_reap_task);
1684                 unregister_netdevice_queue(cpriv->dev, &head);
1685         }
1686         unregister_netdevice_many(&head);
1687
1688         /*
1689          * Must be before ipoib_ib_dev_cleanup or we delete an in use
1690          * work queue
1691          */
1692         ipoib_neigh_hash_uninit(dev);
1693
1694         ipoib_ib_dev_cleanup(dev);
1695
1696         kfree(priv->rx_ring);
1697         vfree(priv->tx_ring);
1698
1699         priv->rx_ring = NULL;
1700         priv->tx_ring = NULL;
1701 }
1702
1703 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1704 {
1705         struct ipoib_dev_priv *priv = netdev_priv(dev);
1706
1707         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1708 }
1709
1710 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1711                                struct ifla_vf_info *ivf)
1712 {
1713         struct ipoib_dev_priv *priv = netdev_priv(dev);
1714         int err;
1715
1716         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
1717         if (err)
1718                 return err;
1719
1720         ivf->vf = vf;
1721
1722         return 0;
1723 }
1724
1725 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
1726 {
1727         struct ipoib_dev_priv *priv = netdev_priv(dev);
1728
1729         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
1730                 return -EINVAL;
1731
1732         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
1733 }
1734
1735 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
1736                               struct ifla_vf_stats *vf_stats)
1737 {
1738         struct ipoib_dev_priv *priv = netdev_priv(dev);
1739
1740         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
1741 }
1742
1743 static const struct header_ops ipoib_header_ops = {
1744         .create = ipoib_hard_header,
1745 };
1746
1747 static const struct net_device_ops ipoib_netdev_ops_pf = {
1748         .ndo_uninit              = ipoib_uninit,
1749         .ndo_open                = ipoib_open,
1750         .ndo_stop                = ipoib_stop,
1751         .ndo_change_mtu          = ipoib_change_mtu,
1752         .ndo_fix_features        = ipoib_fix_features,
1753         .ndo_start_xmit          = ipoib_start_xmit,
1754         .ndo_tx_timeout          = ipoib_timeout,
1755         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1756         .ndo_get_iflink          = ipoib_get_iflink,
1757         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
1758         .ndo_get_vf_config       = ipoib_get_vf_config,
1759         .ndo_get_vf_stats        = ipoib_get_vf_stats,
1760         .ndo_set_vf_guid         = ipoib_set_vf_guid,
1761         .ndo_set_mac_address     = ipoib_set_mac,
1762 };
1763
1764 static const struct net_device_ops ipoib_netdev_ops_vf = {
1765         .ndo_uninit              = ipoib_uninit,
1766         .ndo_open                = ipoib_open,
1767         .ndo_stop                = ipoib_stop,
1768         .ndo_change_mtu          = ipoib_change_mtu,
1769         .ndo_fix_features        = ipoib_fix_features,
1770         .ndo_start_xmit          = ipoib_start_xmit,
1771         .ndo_tx_timeout          = ipoib_timeout,
1772         .ndo_set_rx_mode         = ipoib_set_mcast_list,
1773         .ndo_get_iflink          = ipoib_get_iflink,
1774 };
1775
1776 void ipoib_setup(struct net_device *dev)
1777 {
1778         struct ipoib_dev_priv *priv = netdev_priv(dev);
1779
1780         if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
1781                 dev->netdev_ops = &ipoib_netdev_ops_vf;
1782         else
1783                 dev->netdev_ops = &ipoib_netdev_ops_pf;
1784
1785         dev->header_ops          = &ipoib_header_ops;
1786
1787         ipoib_set_ethtool_ops(dev);
1788
1789         netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1790
1791         dev->watchdog_timeo      = HZ;
1792
1793         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
1794
1795         dev->hard_header_len     = IPOIB_HARD_LEN;
1796         dev->addr_len            = INFINIBAND_ALEN;
1797         dev->type                = ARPHRD_INFINIBAND;
1798         dev->tx_queue_len        = ipoib_sendq_size * 2;
1799         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
1800                                     NETIF_F_HIGHDMA);
1801         netif_keep_dst(dev);
1802
1803         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1804
1805         priv->dev = dev;
1806
1807         spin_lock_init(&priv->lock);
1808
1809         init_rwsem(&priv->vlan_rwsem);
1810
1811         INIT_LIST_HEAD(&priv->path_list);
1812         INIT_LIST_HEAD(&priv->child_intfs);
1813         INIT_LIST_HEAD(&priv->dead_ahs);
1814         INIT_LIST_HEAD(&priv->multicast_list);
1815
1816         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
1817         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1818         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
1819         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
1820         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
1821         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1822         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1823         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1824 }
1825
1826 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1827 {
1828         struct net_device *dev;
1829
1830         dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1831                            NET_NAME_UNKNOWN, ipoib_setup);
1832         if (!dev)
1833                 return NULL;
1834
1835         return netdev_priv(dev);
1836 }
1837
1838 static ssize_t show_pkey(struct device *dev,
1839                          struct device_attribute *attr, char *buf)
1840 {
1841         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1842
1843         return sprintf(buf, "0x%04x\n", priv->pkey);
1844 }
1845 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1846
1847 static ssize_t show_umcast(struct device *dev,
1848                            struct device_attribute *attr, char *buf)
1849 {
1850         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1851
1852         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1853 }
1854
1855 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1856 {
1857         struct ipoib_dev_priv *priv = netdev_priv(ndev);
1858
1859         if (umcast_val > 0) {
1860                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1861                 ipoib_warn(priv, "ignoring multicast groups joined directly "
1862                                 "by userspace\n");
1863         } else
1864                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1865 }
1866
1867 static ssize_t set_umcast(struct device *dev,
1868                           struct device_attribute *attr,
1869                           const char *buf, size_t count)
1870 {
1871         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1872
1873         ipoib_set_umcast(to_net_dev(dev), umcast_val);
1874
1875         return count;
1876 }
1877 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1878
1879 int ipoib_add_umcast_attr(struct net_device *dev)
1880 {
1881         return device_create_file(&dev->dev, &dev_attr_umcast);
1882 }
1883
1884 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
1885 {
1886         struct ipoib_dev_priv *child_priv;
1887         struct net_device *netdev = priv->dev;
1888
1889         netif_addr_lock_bh(netdev);
1890
1891         memcpy(&priv->local_gid.global.interface_id,
1892                &gid->global.interface_id,
1893                sizeof(gid->global.interface_id));
1894         memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
1895         clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1896
1897         netif_addr_unlock_bh(netdev);
1898
1899         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1900                 down_read(&priv->vlan_rwsem);
1901                 list_for_each_entry(child_priv, &priv->child_intfs, list)
1902                         set_base_guid(child_priv, gid);
1903                 up_read(&priv->vlan_rwsem);
1904         }
1905 }
1906
1907 static int ipoib_check_lladdr(struct net_device *dev,
1908                               struct sockaddr_storage *ss)
1909 {
1910         union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
1911         int ret = 0;
1912
1913         netif_addr_lock_bh(dev);
1914
1915         /* Make sure the QPN, reserved and subnet prefix match the current
1916          * lladdr, it also makes sure the lladdr is unicast.
1917          */
1918         if (memcmp(dev->dev_addr, ss->__data,
1919                    4 + sizeof(gid->global.subnet_prefix)) ||
1920             gid->global.interface_id == 0)
1921                 ret = -EINVAL;
1922
1923         netif_addr_unlock_bh(dev);
1924
1925         return ret;
1926 }
1927
1928 static int ipoib_set_mac(struct net_device *dev, void *addr)
1929 {
1930         struct ipoib_dev_priv *priv = netdev_priv(dev);
1931         struct sockaddr_storage *ss = addr;
1932         int ret;
1933
1934         if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
1935                 return -EBUSY;
1936
1937         ret = ipoib_check_lladdr(dev, ss);
1938         if (ret)
1939                 return ret;
1940
1941         set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
1942
1943         queue_work(ipoib_workqueue, &priv->flush_light);
1944
1945         return 0;
1946 }
1947
1948 static ssize_t create_child(struct device *dev,
1949                             struct device_attribute *attr,
1950                             const char *buf, size_t count)
1951 {
1952         int pkey;
1953         int ret;
1954
1955         if (sscanf(buf, "%i", &pkey) != 1)
1956                 return -EINVAL;
1957
1958         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1959                 return -EINVAL;
1960
1961         /*
1962          * Set the full membership bit, so that we join the right
1963          * broadcast group, etc.
1964          */
1965         pkey |= 0x8000;
1966
1967         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1968
1969         return ret ? ret : count;
1970 }
1971 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1972
1973 static ssize_t delete_child(struct device *dev,
1974                             struct device_attribute *attr,
1975                             const char *buf, size_t count)
1976 {
1977         int pkey;
1978         int ret;
1979
1980         if (sscanf(buf, "%i", &pkey) != 1)
1981                 return -EINVAL;
1982
1983         if (pkey < 0 || pkey > 0xffff)
1984                 return -EINVAL;
1985
1986         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1987
1988         return ret ? ret : count;
1989
1990 }
1991 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1992
1993 int ipoib_add_pkey_attr(struct net_device *dev)
1994 {
1995         return device_create_file(&dev->dev, &dev_attr_pkey);
1996 }
1997
1998 void ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1999 {
2000         priv->hca_caps = hca->attrs.device_cap_flags;
2001
2002         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
2003                 priv->dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
2004
2005                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
2006                         priv->dev->hw_features |= NETIF_F_TSO;
2007
2008                 priv->dev->features |= priv->dev->hw_features;
2009         }
2010 }
2011
2012 static struct net_device *ipoib_add_port(const char *format,
2013                                          struct ib_device *hca, u8 port)
2014 {
2015         struct ipoib_dev_priv *priv;
2016         struct ib_port_attr attr;
2017         int result = -ENOMEM;
2018
2019         priv = ipoib_intf_alloc(format);
2020         if (!priv)
2021                 goto alloc_mem_failed;
2022
2023         SET_NETDEV_DEV(priv->dev, hca->dev.parent);
2024         priv->dev->dev_id = port - 1;
2025
2026         result = ib_query_port(hca, port, &attr);
2027         if (!result)
2028                 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
2029         else {
2030                 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
2031                        hca->name, port);
2032                 goto device_init_failed;
2033         }
2034
2035         /* MTU will be reset when mcast join happens */
2036         priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
2037         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
2038         priv->dev->max_mtu = IPOIB_CM_MTU;
2039
2040         priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
2041
2042         result = ib_query_pkey(hca, port, 0, &priv->pkey);
2043         if (result) {
2044                 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
2045                        hca->name, port, result);
2046                 goto device_init_failed;
2047         }
2048
2049         ipoib_set_dev_features(priv, hca);
2050
2051         /*
2052          * Set the full membership bit, so that we join the right
2053          * broadcast group, etc.
2054          */
2055         priv->pkey |= 0x8000;
2056
2057         priv->dev->broadcast[8] = priv->pkey >> 8;
2058         priv->dev->broadcast[9] = priv->pkey & 0xff;
2059
2060         result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
2061         if (result) {
2062                 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
2063                        hca->name, port, result);
2064                 goto device_init_failed;
2065         } else
2066                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
2067         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2068
2069         result = ipoib_dev_init(priv->dev, hca, port);
2070         if (result < 0) {
2071                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
2072                        hca->name, port, result);
2073                 goto device_init_failed;
2074         }
2075
2076         INIT_IB_EVENT_HANDLER(&priv->event_handler,
2077                               priv->ca, ipoib_event);
2078         result = ib_register_event_handler(&priv->event_handler);
2079         if (result < 0) {
2080                 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
2081                        "port %d (ret = %d)\n",
2082                        hca->name, port, result);
2083                 goto event_failed;
2084         }
2085
2086         result = register_netdev(priv->dev);
2087         if (result) {
2088                 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
2089                        hca->name, port, result);
2090                 goto register_failed;
2091         }
2092
2093         ipoib_create_debug_files(priv->dev);
2094
2095         if (ipoib_cm_add_mode_attr(priv->dev))
2096                 goto sysfs_failed;
2097         if (ipoib_add_pkey_attr(priv->dev))
2098                 goto sysfs_failed;
2099         if (ipoib_add_umcast_attr(priv->dev))
2100                 goto sysfs_failed;
2101         if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
2102                 goto sysfs_failed;
2103         if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
2104                 goto sysfs_failed;
2105
2106         return priv->dev;
2107
2108 sysfs_failed:
2109         ipoib_delete_debug_files(priv->dev);
2110         unregister_netdev(priv->dev);
2111
2112 register_failed:
2113         ib_unregister_event_handler(&priv->event_handler);
2114         flush_workqueue(ipoib_workqueue);
2115         /* Stop GC if started before flush */
2116         set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2117         cancel_delayed_work(&priv->neigh_reap_task);
2118         flush_workqueue(priv->wq);
2119
2120 event_failed:
2121         ipoib_dev_cleanup(priv->dev);
2122
2123 device_init_failed:
2124         free_netdev(priv->dev);
2125
2126 alloc_mem_failed:
2127         return ERR_PTR(result);
2128 }
2129
2130 static void ipoib_add_one(struct ib_device *device)
2131 {
2132         struct list_head *dev_list;
2133         struct net_device *dev;
2134         struct ipoib_dev_priv *priv;
2135         int p;
2136         int count = 0;
2137
2138         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
2139         if (!dev_list)
2140                 return;
2141
2142         INIT_LIST_HEAD(dev_list);
2143
2144         for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
2145                 if (!rdma_protocol_ib(device, p))
2146                         continue;
2147                 dev = ipoib_add_port("ib%d", device, p);
2148                 if (!IS_ERR(dev)) {
2149                         priv = netdev_priv(dev);
2150                         list_add_tail(&priv->list, dev_list);
2151                         count++;
2152                 }
2153         }
2154
2155         if (!count) {
2156                 kfree(dev_list);
2157                 return;
2158         }
2159
2160         ib_set_client_data(device, &ipoib_client, dev_list);
2161 }
2162
2163 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2164 {
2165         struct ipoib_dev_priv *priv, *tmp;
2166         struct list_head *dev_list = client_data;
2167
2168         if (!dev_list)
2169                 return;
2170
2171         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2172                 ib_unregister_event_handler(&priv->event_handler);
2173                 flush_workqueue(ipoib_workqueue);
2174
2175                 /* mark interface in the middle of destruction */
2176                 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags);
2177
2178                 rtnl_lock();
2179                 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
2180                 rtnl_unlock();
2181
2182                 /* Stop GC */
2183                 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2184                 cancel_delayed_work(&priv->neigh_reap_task);
2185                 flush_workqueue(priv->wq);
2186
2187                 unregister_netdev(priv->dev);
2188                 free_netdev(priv->dev);
2189         }
2190
2191         kfree(dev_list);
2192 }
2193
2194 static int __init ipoib_init_module(void)
2195 {
2196         int ret;
2197
2198         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2199         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2200         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2201
2202         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2203         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2204         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2205 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2206         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2207 #endif
2208
2209         /*
2210          * When copying small received packets, we only copy from the
2211          * linear data part of the SKB, so we rely on this condition.
2212          */
2213         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2214
2215         ret = ipoib_register_debugfs();
2216         if (ret)
2217                 return ret;
2218
2219         /*
2220          * We create a global workqueue here that is used for all flush
2221          * operations.  However, if you attempt to flush a workqueue
2222          * from a task on that same workqueue, it deadlocks the system.
2223          * We want to be able to flush the tasks associated with a
2224          * specific net device, so we also create a workqueue for each
2225          * netdevice.  We queue up the tasks for that device only on
2226          * its private workqueue, and we only queue up flush events
2227          * on our global flush workqueue.  This avoids the deadlocks.
2228          */
2229         ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush",
2230                                                   WQ_MEM_RECLAIM);
2231         if (!ipoib_workqueue) {
2232                 ret = -ENOMEM;
2233                 goto err_fs;
2234         }
2235
2236         ib_sa_register_client(&ipoib_sa_client);
2237
2238         ret = ib_register_client(&ipoib_client);
2239         if (ret)
2240                 goto err_sa;
2241
2242         ret = ipoib_netlink_init();
2243         if (ret)
2244                 goto err_client;
2245
2246         return 0;
2247
2248 err_client:
2249         ib_unregister_client(&ipoib_client);
2250
2251 err_sa:
2252         ib_sa_unregister_client(&ipoib_sa_client);
2253         destroy_workqueue(ipoib_workqueue);
2254
2255 err_fs:
2256         ipoib_unregister_debugfs();
2257
2258         return ret;
2259 }
2260
2261 static void __exit ipoib_cleanup_module(void)
2262 {
2263         ipoib_netlink_fini();
2264         ib_unregister_client(&ipoib_client);
2265         ib_sa_unregister_client(&ipoib_sa_client);
2266         ipoib_unregister_debugfs();
2267         destroy_workqueue(ipoib_workqueue);
2268 }
2269
2270 module_init(ipoib_init_module);
2271 module_exit(ipoib_cleanup_module);