drivers/net/bonding/bond_alb.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/skbuff.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/pkt_sched.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/slab.h>
  31 #include <linux/timer.h>
  32 #include <linux/ip.h>
  33 #include <linux/ipv6.h>
  34 #include <linux/if_arp.h>
  35 #include <linux/if_ether.h>
  36 #include <linux/if_bonding.h>
  37 #include <linux/if_vlan.h>
  38 #include <linux/in.h>
  39 #include <net/ipx.h>
  40 #include <net/arp.h>
  41 #include <net/ipv6.h>
  42 #include <asm/byteorder.h>
  43 #include "bonding.h"
  44 #include "bond_alb.h"
  45
  46
  47
  48 #ifndef __long_aligned
  49 #define __long_aligned __attribute__((aligned((sizeof(long)))))
  50 #endif
  51 static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
  52         0xff, 0xff, 0xff, 0xff, 0xff, 0xff
  53 };
  54 static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
  55         0x33, 0x33, 0x00, 0x00, 0x00, 0x01
  56 };
  57 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
  58
  59 #pragma pack(1)
  60 struct learning_pkt {
  61         u8 mac_dst[ETH_ALEN];
  62         u8 mac_src[ETH_ALEN];
  63         __be16 type;
  64         u8 padding[ETH_ZLEN - ETH_HLEN];
  65 };
  66
  67 struct arp_pkt {
  68         __be16  hw_addr_space;
  69         __be16  prot_addr_space;
  70         u8      hw_addr_len;
  71         u8      prot_addr_len;
  72         __be16  op_code;
  73         u8      mac_src[ETH_ALEN];      /* sender hardware address */
  74         __be32  ip_src;                 /* sender IP address */
  75         u8      mac_dst[ETH_ALEN];      /* target hardware address */
  76         __be32  ip_dst;                 /* target IP address */
  77 };
  78 #pragma pack()
  79
  80 static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
  81 {
  82         return (struct arp_pkt *)skb_network_header(skb);
  83 }
  84
  85 /* Forward declaration */
  86 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
  87
  88 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
  89 {
  90         int i;
  91         u8 hash = 0;
  92
  93         for (i = 0; i < hash_size; i++) {
  94                 hash ^= hash_start[i];
  95         }
  96
  97         return hash;
  98 }
  99
 100 /*********************** tlb specific functions ***************************/
 101
 102 static inline void _lock_tx_hashtbl(struct bonding *bond)
 103 {
 104         spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
 105 }
 106
 107 static inline void _unlock_tx_hashtbl(struct bonding *bond)
 108 {
 109         spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
 110 }
 111
 112 /* Caller must hold tx_hashtbl lock */
 113 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
 114 {
 115         if (save_load) {
 116                 entry->load_history = 1 + entry->tx_bytes /
 117                                       BOND_TLB_REBALANCE_INTERVAL;
 118                 entry->tx_bytes = 0;
 119         }
 120
 121         entry->tx_slave = NULL;
 122         entry->next = TLB_NULL_INDEX;
 123         entry->prev = TLB_NULL_INDEX;
 124 }
 125
 126 static inline void tlb_init_slave(struct slave *slave)
 127 {
 128         SLAVE_TLB_INFO(slave).load = 0;
 129         SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
 130 }
 131
 132 /* Caller must hold bond lock for read */
 133 static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
 134 {
 135         struct tlb_client_info *tx_hash_table;
 136         u32 index;
 137
 138         _lock_tx_hashtbl(bond);
 139
 140         /* clear slave from tx_hashtbl */
 141         tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
 142
 143         /* skip this if we've already freed the tx hash table */
 144         if (tx_hash_table) {
 145                 index = SLAVE_TLB_INFO(slave).head;
 146                 while (index != TLB_NULL_INDEX) {
 147                         u32 next_index = tx_hash_table[index].next;
 148                         tlb_init_table_entry(&tx_hash_table[index], save_load);
 149                         index = next_index;
 150                 }
 151         }
 152
 153         tlb_init_slave(slave);
 154
 155         _unlock_tx_hashtbl(bond);
 156 }
 157
 158 /* Must be called before starting the monitor timer */
 159 static int tlb_initialize(struct bonding *bond)
 160 {
 161         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 162         int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
 163         struct tlb_client_info *new_hashtbl;
 164         int i;
 165
 166         spin_lock_init(&(bond_info->tx_hashtbl_lock));
 167
 168         new_hashtbl = kzalloc(size, GFP_KERNEL);
 169         if (!new_hashtbl) {
 170                 pr_err("%s: Error: Failed to allocate TLB hash table\n",
 171                        bond->dev->name);
 172                 return -1;
 173         }
 174         _lock_tx_hashtbl(bond);
 175
 176         bond_info->tx_hashtbl = new_hashtbl;
 177
 178         for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
 179                 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
 180         }
 181
 182         _unlock_tx_hashtbl(bond);
 183
 184         return 0;
 185 }
 186
 187 /* Must be called only after all slaves have been released */
 188 static void tlb_deinitialize(struct bonding *bond)
 189 {
 190         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 191
 192         _lock_tx_hashtbl(bond);
 193
 194         kfree(bond_info->tx_hashtbl);
 195         bond_info->tx_hashtbl = NULL;
 196
 197         _unlock_tx_hashtbl(bond);
 198 }
 199
 200 static long long compute_gap(struct slave *slave)
 201 {
 202         return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
 203                (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
 204 }
 205
 206 /* Caller must hold bond lock for read */
 207 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
 208 {
 209         struct slave *slave, *least_loaded;
 210         long long max_gap;
 211         int i;
 212
 213         least_loaded = NULL;
 214         max_gap = LLONG_MIN;
 215
 216         /* Find the slave with the largest gap */
 217         bond_for_each_slave(bond, slave, i) {
 218                 if (SLAVE_IS_OK(slave)) {
 219                         long long gap = compute_gap(slave);
 220
 221                         if (max_gap < gap) {
 222                                 least_loaded = slave;
 223                                 max_gap = gap;
 224                         }
 225                 }
 226         }
 227
 228         return least_loaded;
 229 }
 230
 231 /* Caller must hold bond lock for read */
 232 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
 233 {
 234         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 235         struct tlb_client_info *hash_table;
 236         struct slave *assigned_slave;
 237
 238         _lock_tx_hashtbl(bond);
 239
 240         hash_table = bond_info->tx_hashtbl;
 241         assigned_slave = hash_table[hash_index].tx_slave;
 242         if (!assigned_slave) {
 243                 assigned_slave = tlb_get_least_loaded_slave(bond);
 244
 245                 if (assigned_slave) {
 246                         struct tlb_slave_info *slave_info =
 247                                 &(SLAVE_TLB_INFO(assigned_slave));
 248                         u32 next_index = slave_info->head;
 249
 250                         hash_table[hash_index].tx_slave = assigned_slave;
 251                         hash_table[hash_index].next = next_index;
 252                         hash_table[hash_index].prev = TLB_NULL_INDEX;
 253
 254                         if (next_index != TLB_NULL_INDEX) {
 255                                 hash_table[next_index].prev = hash_index;
 256                         }
 257
 258                         slave_info->head = hash_index;
 259                         slave_info->load +=
 260                                 hash_table[hash_index].load_history;
 261                 }
 262         }
 263
 264         if (assigned_slave) {
 265                 hash_table[hash_index].tx_bytes += skb_len;
 266         }
 267
 268         _unlock_tx_hashtbl(bond);
 269
 270         return assigned_slave;
 271 }
 272
 273 /*********************** rlb specific functions ***************************/
 274 static inline void _lock_rx_hashtbl(struct bonding *bond)
 275 {
 276         spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 277 }
 278
 279 static inline void _unlock_rx_hashtbl(struct bonding *bond)
 280 {
 281         spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 282 }
 283
 284 /* when an ARP REPLY is received from a client update its info
 285  * in the rx_hashtbl
 286  */
 287 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
 288 {
 289         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 290         struct rlb_client_info *client_info;
 291         u32 hash_index;
 292
 293         _lock_rx_hashtbl(bond);
 294
 295         hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
 296         client_info = &(bond_info->rx_hashtbl[hash_index]);
 297
 298         if ((client_info->assigned) &&
 299             (client_info->ip_src == arp->ip_dst) &&
 300             (client_info->ip_dst == arp->ip_src) &&
 301             (compare_ether_addr_64bits(client_info->mac_dst, arp->mac_src))) {
 302                 /* update the clients MAC address */
 303                 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
 304                 client_info->ntt = 1;
 305                 bond_info->rx_ntt = 1;
 306         }
 307
 308         _unlock_rx_hashtbl(bond);
 309 }
 310
 311 static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev)
 312 {
 313         struct bonding *bond;
 314         struct arp_pkt *arp = (struct arp_pkt *)skb->data;
 315         int res = NET_RX_DROP;
 316
 317         while (bond_dev->priv_flags & IFF_802_1Q_VLAN)
 318                 bond_dev = vlan_dev_real_dev(bond_dev);
 319
 320         if (!(bond_dev->priv_flags & IFF_BONDING) ||
 321             !(bond_dev->flags & IFF_MASTER))
 322                 goto out;
 323
 324         if (!arp) {
 325                 pr_debug("Packet has no ARP data\n");
 326                 goto out;
 327         }
 328
 329         if (!pskb_may_pull(skb, arp_hdr_len(bond_dev)))
 330                 goto out;
 331
 332         if (skb->len < sizeof(struct arp_pkt)) {
 333                 pr_debug("Packet is too small to be an ARP\n");
 334                 goto out;
 335         }
 336
 337         if (arp->op_code == htons(ARPOP_REPLY)) {
 338                 /* update rx hash table for this ARP */
 339                 bond = netdev_priv(bond_dev);
 340                 rlb_update_entry_from_arp(bond, arp);
 341                 pr_debug("Server received an ARP Reply from client\n");
 342         }
 343
 344         res = NET_RX_SUCCESS;
 345
 346 out:
 347         dev_kfree_skb(skb);
 348
 349         return res;
 350 }
 351
 352 /* Caller must hold bond lock for read */
 353 static struct slave *rlb_next_rx_slave(struct bonding *bond)
 354 {
 355         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 356         struct slave *rx_slave, *slave, *start_at;
 357         int i = 0;
 358
 359         if (bond_info->next_rx_slave) {
 360                 start_at = bond_info->next_rx_slave;
 361         } else {
 362                 start_at = bond->first_slave;
 363         }
 364
 365         rx_slave = NULL;
 366
 367         bond_for_each_slave_from(bond, slave, i, start_at) {
 368                 if (SLAVE_IS_OK(slave)) {
 369                         if (!rx_slave) {
 370                                 rx_slave = slave;
 371                         } else if (slave->speed > rx_slave->speed) {
 372                                 rx_slave = slave;
 373                         }
 374                 }
 375         }
 376
 377         if (rx_slave) {
 378                 bond_info->next_rx_slave = rx_slave->next;
 379         }
 380
 381         return rx_slave;
 382 }
 383
 384 /* teach the switch the mac of a disabled slave
 385  * on the primary for fault tolerance
 386  *
 387  * Caller must hold bond->curr_slave_lock for write or bond lock for write
 388  */
 389 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
 390 {
 391         if (!bond->curr_active_slave) {
 392                 return;
 393         }
 394
 395         if (!bond->alb_info.primary_is_promisc) {
 396                 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
 397                         bond->alb_info.primary_is_promisc = 1;
 398                 else
 399                         bond->alb_info.primary_is_promisc = 0;
 400         }
 401
 402         bond->alb_info.rlb_promisc_timeout_counter = 0;
 403
 404         alb_send_learning_packets(bond->curr_active_slave, addr);
 405 }
 406
 407 /* slave being removed should not be active at this point
 408  *
 409  * Caller must hold bond lock for read
 410  */
 411 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
 412 {
 413         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 414         struct rlb_client_info *rx_hash_table;
 415         u32 index, next_index;
 416
 417         /* clear slave from rx_hashtbl */
 418         _lock_rx_hashtbl(bond);
 419
 420         rx_hash_table = bond_info->rx_hashtbl;
 421         index = bond_info->rx_hashtbl_head;
 422         for (; index != RLB_NULL_INDEX; index = next_index) {
 423                 next_index = rx_hash_table[index].next;
 424                 if (rx_hash_table[index].slave == slave) {
 425                         struct slave *assigned_slave = rlb_next_rx_slave(bond);
 426
 427                         if (assigned_slave) {
 428                                 rx_hash_table[index].slave = assigned_slave;
 429                                 if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst,
 430                                                               mac_bcast)) {
 431                                         bond_info->rx_hashtbl[index].ntt = 1;
 432                                         bond_info->rx_ntt = 1;
 433                                         /* A slave has been removed from the
 434                                          * table because it is either disabled
 435                                          * or being released. We must retry the
 436                                          * update to avoid clients from not
 437                                          * being updated & disconnecting when
 438                                          * there is stress
 439                                          */
 440                                         bond_info->rlb_update_retry_counter =
 441                                                 RLB_UPDATE_RETRY;
 442                                 }
 443                         } else {  /* there is no active slave */
 444                                 rx_hash_table[index].slave = NULL;
 445                         }
 446                 }
 447         }
 448
 449         _unlock_rx_hashtbl(bond);
 450
 451         write_lock_bh(&bond->curr_slave_lock);
 452
 453         if (slave != bond->curr_active_slave) {
 454                 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
 455         }
 456
 457         write_unlock_bh(&bond->curr_slave_lock);
 458 }
 459
 460 static void rlb_update_client(struct rlb_client_info *client_info)
 461 {
 462         int i;
 463
 464         if (!client_info->slave) {
 465                 return;
 466         }
 467
 468         for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
 469                 struct sk_buff *skb;
 470
 471                 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
 472                                  client_info->ip_dst,
 473                                  client_info->slave->dev,
 474                                  client_info->ip_src,
 475                                  client_info->mac_dst,
 476                                  client_info->slave->dev->dev_addr,
 477                                  client_info->mac_dst);
 478                 if (!skb) {
 479                         pr_err("%s: Error: failed to create an ARP packet\n",
 480                                client_info->slave->dev->master->name);
 481                         continue;
 482                 }
 483
 484                 skb->dev = client_info->slave->dev;
 485
 486                 if (client_info->tag) {
 487                         skb = vlan_put_tag(skb, client_info->vlan_id);
 488                         if (!skb) {
 489                                 pr_err("%s: Error: failed to insert VLAN tag\n",
 490                                        client_info->slave->dev->master->name);
 491                                 continue;
 492                         }
 493                 }
 494
 495                 arp_xmit(skb);
 496         }
 497 }
 498
 499 /* sends ARP REPLIES that update the clients that need updating */
 500 static void rlb_update_rx_clients(struct bonding *bond)
 501 {
 502         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 503         struct rlb_client_info *client_info;
 504         u32 hash_index;
 505
 506         _lock_rx_hashtbl(bond);
 507
 508         hash_index = bond_info->rx_hashtbl_head;
 509         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 510                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 511                 if (client_info->ntt) {
 512                         rlb_update_client(client_info);
 513                         if (bond_info->rlb_update_retry_counter == 0) {
 514                                 client_info->ntt = 0;
 515                         }
 516                 }
 517         }
 518
 519         /* do not update the entries again until this counter is zero so that
 520          * not to confuse the clients.
 521          */
 522         bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
 523
 524         _unlock_rx_hashtbl(bond);
 525 }
 526
 527 /* The slave was assigned a new mac address - update the clients */
 528 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
 529 {
 530         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 531         struct rlb_client_info *client_info;
 532         int ntt = 0;
 533         u32 hash_index;
 534
 535         _lock_rx_hashtbl(bond);
 536
 537         hash_index = bond_info->rx_hashtbl_head;
 538         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 539                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 540
 541                 if ((client_info->slave == slave) &&
 542                     compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
 543                         client_info->ntt = 1;
 544                         ntt = 1;
 545                 }
 546         }
 547
 548         // update the team's flag only after the whole iteration
 549         if (ntt) {
 550                 bond_info->rx_ntt = 1;
 551                 //fasten the change
 552                 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
 553         }
 554
 555         _unlock_rx_hashtbl(bond);
 556 }
 557
 558 /* mark all clients using src_ip to be updated */
 559 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
 560 {
 561         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 562         struct rlb_client_info *client_info;
 563         u32 hash_index;
 564
 565         _lock_rx_hashtbl(bond);
 566
 567         hash_index = bond_info->rx_hashtbl_head;
 568         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 569                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 570
 571                 if (!client_info->slave) {
 572                         pr_err("%s: Error: found a client with no channel in the client's hash table\n",
 573                                bond->dev->name);
 574                         continue;
 575                 }
 576                 /*update all clients using this src_ip, that are not assigned
 577                  * to the team's address (curr_active_slave) and have a known
 578                  * unicast mac address.
 579                  */
 580                 if ((client_info->ip_src == src_ip) &&
 581                     compare_ether_addr_64bits(client_info->slave->dev->dev_addr,
 582                            bond->dev->dev_addr) &&
 583                     compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
 584                         client_info->ntt = 1;
 585                         bond_info->rx_ntt = 1;
 586                 }
 587         }
 588
 589         _unlock_rx_hashtbl(bond);
 590 }
 591
 592 /* Caller must hold both bond and ptr locks for read */
 593 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
 594 {
 595         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 596         struct arp_pkt *arp = arp_pkt(skb);
 597         struct slave *assigned_slave;
 598         struct rlb_client_info *client_info;
 599         u32 hash_index = 0;
 600
 601         _lock_rx_hashtbl(bond);
 602
 603         hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src));
 604         client_info = &(bond_info->rx_hashtbl[hash_index]);
 605
 606         if (client_info->assigned) {
 607                 if ((client_info->ip_src == arp->ip_src) &&
 608                     (client_info->ip_dst == arp->ip_dst)) {
 609                         /* the entry is already assigned to this client */
 610                         if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) {
 611                                 /* update mac address from arp */
 612                                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
 613                         }
 614
 615                         assigned_slave = client_info->slave;
 616                         if (assigned_slave) {
 617                                 _unlock_rx_hashtbl(bond);
 618                                 return assigned_slave;
 619                         }
 620                 } else {
 621                         /* the entry is already assigned to some other client,
 622                          * move the old client to primary (curr_active_slave) so
 623                          * that the new client can be assigned to this entry.
 624                          */
 625                         if (bond->curr_active_slave &&
 626                             client_info->slave != bond->curr_active_slave) {
 627                                 client_info->slave = bond->curr_active_slave;
 628                                 rlb_update_client(client_info);
 629                         }
 630                 }
 631         }
 632         /* assign a new slave */
 633         assigned_slave = rlb_next_rx_slave(bond);
 634
 635         if (assigned_slave) {
 636                 client_info->ip_src = arp->ip_src;
 637                 client_info->ip_dst = arp->ip_dst;
 638                 /* arp->mac_dst is broadcast for arp reqeusts.
 639                  * will be updated with clients actual unicast mac address
 640                  * upon receiving an arp reply.
 641                  */
 642                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
 643                 client_info->slave = assigned_slave;
 644
 645                 if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
 646                         client_info->ntt = 1;
 647                         bond->alb_info.rx_ntt = 1;
 648                 } else {
 649                         client_info->ntt = 0;
 650                 }
 651
 652                 if (bond->vlgrp) {
 653                         if (!vlan_get_tag(skb, &client_info->vlan_id))
 654                                 client_info->tag = 1;
 655                 }
 656
 657                 if (!client_info->assigned) {
 658                         u32 prev_tbl_head = bond_info->rx_hashtbl_head;
 659                         bond_info->rx_hashtbl_head = hash_index;
 660                         client_info->next = prev_tbl_head;
 661                         if (prev_tbl_head != RLB_NULL_INDEX) {
 662                                 bond_info->rx_hashtbl[prev_tbl_head].prev =
 663                                         hash_index;
 664                         }
 665                         client_info->assigned = 1;
 666                 }
 667         }
 668
 669         _unlock_rx_hashtbl(bond);
 670
 671         return assigned_slave;
 672 }
 673
 674 /* chooses (and returns) transmit channel for arp reply
 675  * does not choose channel for other arp types since they are
 676  * sent on the curr_active_slave
 677  */
 678 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
 679 {
 680         struct arp_pkt *arp = arp_pkt(skb);
 681         struct slave *tx_slave = NULL;
 682
 683         if (arp->op_code == htons(ARPOP_REPLY)) {
 684                 /* the arp must be sent on the selected
 685                 * rx channel
 686                 */
 687                 tx_slave = rlb_choose_channel(skb, bond);
 688                 if (tx_slave) {
 689                         memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
 690                 }
 691                 pr_debug("Server sent ARP Reply packet\n");
 692         } else if (arp->op_code == htons(ARPOP_REQUEST)) {
 693                 /* Create an entry in the rx_hashtbl for this client as a
 694                  * place holder.
 695                  * When the arp reply is received the entry will be updated
 696                  * with the correct unicast address of the client.
 697                  */
 698                 rlb_choose_channel(skb, bond);
 699
 700                 /* The ARP relpy packets must be delayed so that
 701                  * they can cancel out the influence of the ARP request.
 702                  */
 703                 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
 704
 705                 /* arp requests are broadcast and are sent on the primary
 706                  * the arp request will collapse all clients on the subnet to
 707                  * the primary slave. We must register these clients to be
 708                  * updated with their assigned mac.
 709                  */
 710                 rlb_req_update_subnet_clients(bond, arp->ip_src);
 711                 pr_debug("Server sent ARP Request packet\n");
 712         }
 713
 714         return tx_slave;
 715 }
 716
 717 /* Caller must hold bond lock for read */
 718 static void rlb_rebalance(struct bonding *bond)
 719 {
 720         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 721         struct slave *assigned_slave;
 722         struct rlb_client_info *client_info;
 723         int ntt;
 724         u32 hash_index;
 725
 726         _lock_rx_hashtbl(bond);
 727
 728         ntt = 0;
 729         hash_index = bond_info->rx_hashtbl_head;
 730         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 731                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 732                 assigned_slave = rlb_next_rx_slave(bond);
 733                 if (assigned_slave && (client_info->slave != assigned_slave)) {
 734                         client_info->slave = assigned_slave;
 735                         client_info->ntt = 1;
 736                         ntt = 1;
 737                 }
 738         }
 739
 740         /* update the team's flag only after the whole iteration */
 741         if (ntt) {
 742                 bond_info->rx_ntt = 1;
 743         }
 744         _unlock_rx_hashtbl(bond);
 745 }
 746
 747 /* Caller must hold rx_hashtbl lock */
 748 static void rlb_init_table_entry(struct rlb_client_info *entry)
 749 {
 750         memset(entry, 0, sizeof(struct rlb_client_info));
 751         entry->next = RLB_NULL_INDEX;
 752         entry->prev = RLB_NULL_INDEX;
 753 }
 754
 755 static int rlb_initialize(struct bonding *bond)
 756 {
 757         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 758         struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type);
 759         struct rlb_client_info  *new_hashtbl;
 760         int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
 761         int i;
 762
 763         spin_lock_init(&(bond_info->rx_hashtbl_lock));
 764
 765         new_hashtbl = kmalloc(size, GFP_KERNEL);
 766         if (!new_hashtbl) {
 767                 pr_err("%s: Error: Failed to allocate RLB hash table\n",
 768                        bond->dev->name);
 769                 return -1;
 770         }
 771         _lock_rx_hashtbl(bond);
 772
 773         bond_info->rx_hashtbl = new_hashtbl;
 774
 775         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
 776
 777         for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
 778                 rlb_init_table_entry(bond_info->rx_hashtbl + i);
 779         }
 780
 781         _unlock_rx_hashtbl(bond);
 782
 783         /*initialize packet type*/
 784         pk_type->type = cpu_to_be16(ETH_P_ARP);
 785         pk_type->dev = bond->dev;
 786         pk_type->func = rlb_arp_recv;
 787
 788         /* register to receive ARPs */
 789         dev_add_pack(pk_type);
 790
 791         return 0;
 792 }
 793
 794 static void rlb_deinitialize(struct bonding *bond)
 795 {
 796         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 797
 798         dev_remove_pack(&(bond_info->rlb_pkt_type));
 799
 800         _lock_rx_hashtbl(bond);
 801
 802         kfree(bond_info->rx_hashtbl);
 803         bond_info->rx_hashtbl = NULL;
 804         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
 805
 806         _unlock_rx_hashtbl(bond);
 807 }
 808
 809 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
 810 {
 811         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 812         u32 curr_index;
 813
 814         _lock_rx_hashtbl(bond);
 815
 816         curr_index = bond_info->rx_hashtbl_head;
 817         while (curr_index != RLB_NULL_INDEX) {
 818                 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
 819                 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
 820                 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
 821
 822                 if (curr->tag && (curr->vlan_id == vlan_id)) {
 823                         if (curr_index == bond_info->rx_hashtbl_head) {
 824                                 bond_info->rx_hashtbl_head = next_index;
 825                         }
 826                         if (prev_index != RLB_NULL_INDEX) {
 827                                 bond_info->rx_hashtbl[prev_index].next = next_index;
 828                         }
 829                         if (next_index != RLB_NULL_INDEX) {
 830                                 bond_info->rx_hashtbl[next_index].prev = prev_index;
 831                         }
 832
 833                         rlb_init_table_entry(curr);
 834                 }
 835
 836                 curr_index = next_index;
 837         }
 838
 839         _unlock_rx_hashtbl(bond);
 840 }
 841
 842 /*********************** tlb/rlb shared functions *********************/
 843
 844 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
 845 {
 846         struct bonding *bond = bond_get_bond_by_slave(slave);
 847         struct learning_pkt pkt;
 848         int size = sizeof(struct learning_pkt);
 849         int i;
 850
 851         memset(&pkt, 0, size);
 852         memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
 853         memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
 854         pkt.type = cpu_to_be16(ETH_P_LOOP);
 855
 856         for (i = 0; i < MAX_LP_BURST; i++) {
 857                 struct sk_buff *skb;
 858                 char *data;
 859
 860                 skb = dev_alloc_skb(size);
 861                 if (!skb) {
 862                         return;
 863                 }
 864
 865                 data = skb_put(skb, size);
 866                 memcpy(data, &pkt, size);
 867
 868                 skb_reset_mac_header(skb);
 869                 skb->network_header = skb->mac_header + ETH_HLEN;
 870                 skb->protocol = pkt.type;
 871                 skb->priority = TC_PRIO_CONTROL;
 872                 skb->dev = slave->dev;
 873
 874                 if (bond->vlgrp) {
 875                         struct vlan_entry *vlan;
 876
 877                         vlan = bond_next_vlan(bond,
 878                                               bond->alb_info.current_alb_vlan);
 879
 880                         bond->alb_info.current_alb_vlan = vlan;
 881                         if (!vlan) {
 882                                 kfree_skb(skb);
 883                                 continue;
 884                         }
 885
 886                         skb = vlan_put_tag(skb, vlan->vlan_id);
 887                         if (!skb) {
 888                                 pr_err("%s: Error: failed to insert VLAN tag\n",
 889                                        bond->dev->name);
 890                                 continue;
 891                         }
 892                 }
 893
 894                 dev_queue_xmit(skb);
 895         }
 896 }
 897
 898 /* hw is a boolean parameter that determines whether we should try and
 899  * set the hw address of the device as well as the hw address of the
 900  * net_device
 901  */
 902 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
 903 {
 904         struct net_device *dev = slave->dev;
 905         struct sockaddr s_addr;
 906
 907         if (!hw) {
 908                 memcpy(dev->dev_addr, addr, dev->addr_len);
 909                 return 0;
 910         }
 911
 912         /* for rlb each slave must have a unique hw mac addresses so that */
 913         /* each slave will receive packets destined to a different mac */
 914         memcpy(s_addr.sa_data, addr, dev->addr_len);
 915         s_addr.sa_family = dev->type;
 916         if (dev_set_mac_address(dev, &s_addr)) {
 917                 pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
 918                        "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
 919                        dev->master->name, dev->name);
 920                 return -EOPNOTSUPP;
 921         }
 922         return 0;
 923 }
 924
 925 /*
 926  * Swap MAC addresses between two slaves.
 927  *
 928  * Called with RTNL held, and no other locks.
 929  *
 930  */
 931
 932 static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
 933 {
 934         u8 tmp_mac_addr[ETH_ALEN];
 935
 936         memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
 937         alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
 938         alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
 939
 940 }
 941
 942 /*
 943  * Send learning packets after MAC address swap.
 944  *
 945  * Called with RTNL and no other locks
 946  */
 947 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
 948                                 struct slave *slave2)
 949 {
 950         int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
 951         struct slave *disabled_slave = NULL;
 952
 953         ASSERT_RTNL();
 954
 955         /* fasten the change in the switch */
 956         if (SLAVE_IS_OK(slave1)) {
 957                 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
 958                 if (bond->alb_info.rlb_enabled) {
 959                         /* inform the clients that the mac address
 960                          * has changed
 961                          */
 962                         rlb_req_update_slave_clients(bond, slave1);
 963                 }
 964         } else {
 965                 disabled_slave = slave1;
 966         }
 967
 968         if (SLAVE_IS_OK(slave2)) {
 969                 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
 970                 if (bond->alb_info.rlb_enabled) {
 971                         /* inform the clients that the mac address
 972                          * has changed
 973                          */
 974                         rlb_req_update_slave_clients(bond, slave2);
 975                 }
 976         } else {
 977                 disabled_slave = slave2;
 978         }
 979
 980         if (bond->alb_info.rlb_enabled && slaves_state_differ) {
 981                 /* A disabled slave was assigned an active mac addr */
 982                 rlb_teach_disabled_mac_on_primary(bond,
 983                                                   disabled_slave->dev->dev_addr);
 984         }
 985 }
 986
 987 /**
 988  * alb_change_hw_addr_on_detach
 989  * @bond: bonding we're working on
 990  * @slave: the slave that was just detached
 991  *
 992  * We assume that @slave was already detached from the slave list.
 993  *
 994  * If @slave's permanent hw address is different both from its current
 995  * address and from @bond's address, then somewhere in the bond there's
 996  * a slave that has @slave's permanet address as its current address.
 997  * We'll make sure that that slave no longer uses @slave's permanent address.
 998  *
 999  * Caller must hold RTNL and no other locks
1000  */
1001 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1002 {
1003         int perm_curr_diff;
1004         int perm_bond_diff;
1005
1006         perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
1007                                                    slave->dev->dev_addr);
1008         perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
1009                                                    bond->dev->dev_addr);
1010
1011         if (perm_curr_diff && perm_bond_diff) {
1012                 struct slave *tmp_slave;
1013                 int i, found = 0;
1014
1015                 bond_for_each_slave(bond, tmp_slave, i) {
1016                         if (!compare_ether_addr_64bits(slave->perm_hwaddr,
1017                                                        tmp_slave->dev->dev_addr)) {
1018                                 found = 1;
1019                                 break;
1020                         }
1021                 }
1022
1023                 if (found) {
1024                         /* locking: needs RTNL and nothing else */
1025                         alb_swap_mac_addr(bond, slave, tmp_slave);
1026                         alb_fasten_mac_swap(bond, slave, tmp_slave);
1027                 }
1028         }
1029 }
1030
1031 /**
1032  * alb_handle_addr_collision_on_attach
1033  * @bond: bonding we're working on
1034  * @slave: the slave that was just attached
1035  *
1036  * checks uniqueness of slave's mac address and handles the case the
1037  * new slave uses the bonds mac address.
1038  *
1039  * If the permanent hw address of @slave is @bond's hw address, we need to
1040  * find a different hw address to give @slave, that isn't in use by any other
1041  * slave in the bond. This address must be, of course, one of the premanent
1042  * addresses of the other slaves.
1043  *
1044  * We go over the slave list, and for each slave there we compare its
1045  * permanent hw address with the current address of all the other slaves.
1046  * If no match was found, then we've found a slave with a permanent address
1047  * that isn't used by any other slave in the bond, so we can assign it to
1048  * @slave.
1049  *
1050  * assumption: this function is called before @slave is attached to the
1051  *             bond slave list.
1052  *
1053  * caller must hold the bond lock for write since the mac addresses are compared
1054  * and may be swapped.
1055  */
1056 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1057 {
1058         struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1059         struct slave *has_bond_addr = bond->curr_active_slave;
1060         int i, j, found = 0;
1061
1062         if (bond->slave_cnt == 0) {
1063                 /* this is the first slave */
1064                 return 0;
1065         }
1066
1067         /* if slave's mac address differs from bond's mac address
1068          * check uniqueness of slave's mac address against the other
1069          * slaves in the bond.
1070          */
1071         if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1072                 bond_for_each_slave(bond, tmp_slave1, i) {
1073                         if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1074                                                        slave->dev->dev_addr)) {
1075                                 found = 1;
1076                                 break;
1077                         }
1078                 }
1079
1080                 if (!found)
1081                         return 0;
1082
1083                 /* Try setting slave mac to bond address and fall-through
1084                    to code handling that situation below... */
1085                 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1086                                        bond->alb_info.rlb_enabled);
1087         }
1088
1089         /* The slave's address is equal to the address of the bond.
1090          * Search for a spare address in the bond for this slave.
1091          */
1092         free_mac_slave = NULL;
1093
1094         bond_for_each_slave(bond, tmp_slave1, i) {
1095                 found = 0;
1096                 bond_for_each_slave(bond, tmp_slave2, j) {
1097                         if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr,
1098                                                        tmp_slave2->dev->dev_addr)) {
1099                                 found = 1;
1100                                 break;
1101                         }
1102                 }
1103
1104                 if (!found) {
1105                         /* no slave has tmp_slave1's perm addr
1106                          * as its curr addr
1107                          */
1108                         free_mac_slave = tmp_slave1;
1109                         break;
1110                 }
1111
1112                 if (!has_bond_addr) {
1113                         if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
1114                                                        bond->dev->dev_addr)) {
1115
1116                                 has_bond_addr = tmp_slave1;
1117                         }
1118                 }
1119         }
1120
1121         if (free_mac_slave) {
1122                 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1123                                        bond->alb_info.rlb_enabled);
1124
1125                 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1126                            bond->dev->name, slave->dev->name,
1127                            free_mac_slave->dev->name);
1128
1129         } else if (has_bond_addr) {
1130                 pr_err("%s: Error: the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n",
1131                        bond->dev->name, slave->dev->name);
1132                 return -EFAULT;
1133         }
1134
1135         return 0;
1136 }
1137
1138 /**
1139  * alb_set_mac_address
1140  * @bond:
1141  * @addr:
1142  *
1143  * In TLB mode all slaves are configured to the bond's hw address, but set
1144  * their dev_addr field to different addresses (based on their permanent hw
1145  * addresses).
1146  *
1147  * For each slave, this function sets the interface to the new address and then
1148  * changes its dev_addr field to its previous value.
1149  *
1150  * Unwinding assumes bond's mac address has not yet changed.
1151  */
1152 static int alb_set_mac_address(struct bonding *bond, void *addr)
1153 {
1154         struct sockaddr sa;
1155         struct slave *slave, *stop_at;
1156         char tmp_addr[ETH_ALEN];
1157         int res;
1158         int i;
1159
1160         if (bond->alb_info.rlb_enabled) {
1161                 return 0;
1162         }
1163
1164         bond_for_each_slave(bond, slave, i) {
1165                 /* save net_device's current hw address */
1166                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1167
1168                 res = dev_set_mac_address(slave->dev, addr);
1169
1170                 /* restore net_device's hw address */
1171                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1172
1173                 if (res)
1174                         goto unwind;
1175         }
1176
1177         return 0;
1178
1179 unwind:
1180         memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1181         sa.sa_family = bond->dev->type;
1182
1183         /* unwind from head to the slave that failed */
1184         stop_at = slave;
1185         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1186                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1187                 dev_set_mac_address(slave->dev, &sa);
1188                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1189         }
1190
1191         return res;
1192 }
1193
1194 /************************ exported alb funcions ************************/
1195
1196 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1197 {
1198         int res;
1199
1200         res = tlb_initialize(bond);
1201         if (res) {
1202                 return res;
1203         }
1204
1205         if (rlb_enabled) {
1206                 bond->alb_info.rlb_enabled = 1;
1207                 /* initialize rlb */
1208                 res = rlb_initialize(bond);
1209                 if (res) {
1210                         tlb_deinitialize(bond);
1211                         return res;
1212                 }
1213         } else {
1214                 bond->alb_info.rlb_enabled = 0;
1215         }
1216
1217         return 0;
1218 }
1219
1220 void bond_alb_deinitialize(struct bonding *bond)
1221 {
1222         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1223
1224         tlb_deinitialize(bond);
1225
1226         if (bond_info->rlb_enabled) {
1227                 rlb_deinitialize(bond);
1228         }
1229 }
1230
1231 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1232 {
1233         struct bonding *bond = netdev_priv(bond_dev);
1234         struct ethhdr *eth_data;
1235         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1236         struct slave *tx_slave = NULL;
1237         static const __be32 ip_bcast = htonl(0xffffffff);
1238         int hash_size = 0;
1239         int do_tx_balance = 1;
1240         u32 hash_index = 0;
1241         const u8 *hash_start = NULL;
1242         int res = 1;
1243         struct ipv6hdr *ip6hdr;
1244
1245         skb_reset_mac_header(skb);
1246         eth_data = eth_hdr(skb);
1247
1248         /* make sure that the curr_active_slave and the slaves list do
1249          * not change during tx
1250          */
1251         read_lock(&bond->lock);
1252         read_lock(&bond->curr_slave_lock);
1253
1254         if (!BOND_IS_OK(bond)) {
1255                 goto out;
1256         }
1257
1258         switch (ntohs(skb->protocol)) {
1259         case ETH_P_IP: {
1260                 const struct iphdr *iph = ip_hdr(skb);
1261
1262                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) ||
1263                     (iph->daddr == ip_bcast) ||
1264                     (iph->protocol == IPPROTO_IGMP)) {
1265                         do_tx_balance = 0;
1266                         break;
1267                 }
1268                 hash_start = (char *)&(iph->daddr);
1269                 hash_size = sizeof(iph->daddr);
1270         }
1271                 break;
1272         case ETH_P_IPV6:
1273                 /* IPv6 doesn't really use broadcast mac address, but leave
1274                  * that here just in case.
1275                  */
1276                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) {
1277                         do_tx_balance = 0;
1278                         break;
1279                 }
1280
1281                 /* IPv6 uses all-nodes multicast as an equivalent to
1282                  * broadcasts in IPv4.
1283                  */
1284                 if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1285                         do_tx_balance = 0;
1286                         break;
1287                 }
1288
1289                 /* Additianally, DAD probes should not be tx-balanced as that
1290                  * will lead to false positives for duplicate addresses and
1291                  * prevent address configuration from working.
1292                  */
1293                 ip6hdr = ipv6_hdr(skb);
1294                 if (ipv6_addr_any(&ip6hdr->saddr)) {
1295                         do_tx_balance = 0;
1296                         break;
1297                 }
1298
1299                 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1300                 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1301                 break;
1302         case ETH_P_IPX:
1303                 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1304                         /* something is wrong with this packet */
1305                         do_tx_balance = 0;
1306                         break;
1307                 }
1308
1309                 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1310                         /* The only protocol worth balancing in
1311                          * this family since it has an "ARP" like
1312                          * mechanism
1313                          */
1314                         do_tx_balance = 0;
1315                         break;
1316                 }
1317
1318                 hash_start = (char*)eth_data->h_dest;
1319                 hash_size = ETH_ALEN;
1320                 break;
1321         case ETH_P_ARP:
1322                 do_tx_balance = 0;
1323                 if (bond_info->rlb_enabled) {
1324                         tx_slave = rlb_arp_xmit(skb, bond);
1325                 }
1326                 break;
1327         default:
1328                 do_tx_balance = 0;
1329                 break;
1330         }
1331
1332         if (do_tx_balance) {
1333                 hash_index = _simple_hash(hash_start, hash_size);
1334                 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1335         }
1336
1337         if (!tx_slave) {
1338                 /* unbalanced or unassigned, send through primary */
1339                 tx_slave = bond->curr_active_slave;
1340                 bond_info->unbalanced_load += skb->len;
1341         }
1342
1343         if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1344                 if (tx_slave != bond->curr_active_slave) {
1345                         memcpy(eth_data->h_source,
1346                                tx_slave->dev->dev_addr,
1347                                ETH_ALEN);
1348                 }
1349
1350                 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1351         } else {
1352                 if (tx_slave) {
1353                         tlb_clear_slave(bond, tx_slave, 0);
1354                 }
1355         }
1356
1357 out:
1358         if (res) {
1359                 /* no suitable interface, frame not sent */
1360                 dev_kfree_skb(skb);
1361         }
1362         read_unlock(&bond->curr_slave_lock);
1363         read_unlock(&bond->lock);
1364         return NETDEV_TX_OK;
1365 }
1366
1367 void bond_alb_monitor(struct work_struct *work)
1368 {
1369         struct bonding *bond = container_of(work, struct bonding,
1370                                             alb_work.work);
1371         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1372         struct slave *slave;
1373         int i;
1374
1375         read_lock(&bond->lock);
1376
1377         if (bond->kill_timers) {
1378                 goto out;
1379         }
1380
1381         if (bond->slave_cnt == 0) {
1382                 bond_info->tx_rebalance_counter = 0;
1383                 bond_info->lp_counter = 0;
1384                 goto re_arm;
1385         }
1386
1387         bond_info->tx_rebalance_counter++;
1388         bond_info->lp_counter++;
1389
1390         /* send learning packets */
1391         if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1392                 /* change of curr_active_slave involves swapping of mac addresses.
1393                  * in order to avoid this swapping from happening while
1394                  * sending the learning packets, the curr_slave_lock must be held for
1395                  * read.
1396                  */
1397                 read_lock(&bond->curr_slave_lock);
1398
1399                 bond_for_each_slave(bond, slave, i) {
1400                         alb_send_learning_packets(slave, slave->dev->dev_addr);
1401                 }
1402
1403                 read_unlock(&bond->curr_slave_lock);
1404
1405                 bond_info->lp_counter = 0;
1406         }
1407
1408         /* rebalance tx traffic */
1409         if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1410
1411                 read_lock(&bond->curr_slave_lock);
1412
1413                 bond_for_each_slave(bond, slave, i) {
1414                         tlb_clear_slave(bond, slave, 1);
1415                         if (slave == bond->curr_active_slave) {
1416                                 SLAVE_TLB_INFO(slave).load =
1417                                         bond_info->unbalanced_load /
1418                                                 BOND_TLB_REBALANCE_INTERVAL;
1419                                 bond_info->unbalanced_load = 0;
1420                         }
1421                 }
1422
1423                 read_unlock(&bond->curr_slave_lock);
1424
1425                 bond_info->tx_rebalance_counter = 0;
1426         }
1427
1428         /* handle rlb stuff */
1429         if (bond_info->rlb_enabled) {
1430                 if (bond_info->primary_is_promisc &&
1431                     (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1432
1433                         /*
1434                          * dev_set_promiscuity requires rtnl and
1435                          * nothing else.
1436                          */
1437                         read_unlock(&bond->lock);
1438                         rtnl_lock();
1439
1440                         bond_info->rlb_promisc_timeout_counter = 0;
1441
1442                         /* If the primary was set to promiscuous mode
1443                          * because a slave was disabled then
1444                          * it can now leave promiscuous mode.
1445                          */
1446                         dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1447                         bond_info->primary_is_promisc = 0;
1448
1449                         rtnl_unlock();
1450                         read_lock(&bond->lock);
1451                 }
1452
1453                 if (bond_info->rlb_rebalance) {
1454                         bond_info->rlb_rebalance = 0;
1455                         rlb_rebalance(bond);
1456                 }
1457
1458                 /* check if clients need updating */
1459                 if (bond_info->rx_ntt) {
1460                         if (bond_info->rlb_update_delay_counter) {
1461                                 --bond_info->rlb_update_delay_counter;
1462                         } else {
1463                                 rlb_update_rx_clients(bond);
1464                                 if (bond_info->rlb_update_retry_counter) {
1465                                         --bond_info->rlb_update_retry_counter;
1466                                 } else {
1467                                         bond_info->rx_ntt = 0;
1468                                 }
1469                         }
1470                 }
1471         }
1472
1473 re_arm:
1474         queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1475 out:
1476         read_unlock(&bond->lock);
1477 }
1478
1479 /* assumption: called before the slave is attached to the bond
1480  * and not locked by the bond lock
1481  */
1482 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1483 {
1484         int res;
1485
1486         res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1487                                      bond->alb_info.rlb_enabled);
1488         if (res) {
1489                 return res;
1490         }
1491
1492         /* caller must hold the bond lock for write since the mac addresses
1493          * are compared and may be swapped.
1494          */
1495         read_lock(&bond->lock);
1496
1497         res = alb_handle_addr_collision_on_attach(bond, slave);
1498
1499         read_unlock(&bond->lock);
1500
1501         if (res) {
1502                 return res;
1503         }
1504
1505         tlb_init_slave(slave);
1506
1507         /* order a rebalance ASAP */
1508         bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1509
1510         if (bond->alb_info.rlb_enabled) {
1511                 bond->alb_info.rlb_rebalance = 1;
1512         }
1513
1514         return 0;
1515 }
1516
1517 /*
1518  * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1519  * if necessary.
1520  *
1521  * Caller must hold RTNL and no other locks
1522  */
1523 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1524 {
1525         if (bond->slave_cnt > 1) {
1526                 alb_change_hw_addr_on_detach(bond, slave);
1527         }
1528
1529         tlb_clear_slave(bond, slave, 0);
1530
1531         if (bond->alb_info.rlb_enabled) {
1532                 bond->alb_info.next_rx_slave = NULL;
1533                 rlb_clear_slave(bond, slave);
1534         }
1535 }
1536
1537 /* Caller must hold bond lock for read */
1538 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1539 {
1540         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1541
1542         if (link == BOND_LINK_DOWN) {
1543                 tlb_clear_slave(bond, slave, 0);
1544                 if (bond->alb_info.rlb_enabled) {
1545                         rlb_clear_slave(bond, slave);
1546                 }
1547         } else if (link == BOND_LINK_UP) {
1548                 /* order a rebalance ASAP */
1549                 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1550                 if (bond->alb_info.rlb_enabled) {
1551                         bond->alb_info.rlb_rebalance = 1;
1552                         /* If the updelay module parameter is smaller than the
1553                          * forwarding delay of the switch the rebalance will
1554                          * not work because the rebalance arp replies will
1555                          * not be forwarded to the clients..
1556                          */
1557                 }
1558         }
1559 }
1560
1561 /**
1562  * bond_alb_handle_active_change - assign new curr_active_slave
1563  * @bond: our bonding struct
1564  * @new_slave: new slave to assign
1565  *
1566  * Set the bond->curr_active_slave to @new_slave and handle
1567  * mac address swapping and promiscuity changes as needed.
1568  *
1569  * If new_slave is NULL, caller must hold curr_slave_lock or
1570  * bond->lock for write.
1571  *
1572  * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1573  * read and curr_slave_lock for write.  Processing here may sleep, so
1574  * no other locks may be held.
1575  */
1576 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1577         __releases(&bond->curr_slave_lock)
1578         __releases(&bond->lock)
1579         __acquires(&bond->lock)
1580         __acquires(&bond->curr_slave_lock)
1581 {
1582         struct slave *swap_slave;
1583         int i;
1584
1585         if (bond->curr_active_slave == new_slave) {
1586                 return;
1587         }
1588
1589         if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1590                 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1591                 bond->alb_info.primary_is_promisc = 0;
1592                 bond->alb_info.rlb_promisc_timeout_counter = 0;
1593         }
1594
1595         swap_slave = bond->curr_active_slave;
1596         bond->curr_active_slave = new_slave;
1597
1598         if (!new_slave || (bond->slave_cnt == 0)) {
1599                 return;
1600         }
1601
1602         /* set the new curr_active_slave to the bonds mac address
1603          * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1604          */
1605         if (!swap_slave) {
1606                 struct slave *tmp_slave;
1607                 /* find slave that is holding the bond's mac address */
1608                 bond_for_each_slave(bond, tmp_slave, i) {
1609                         if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr,
1610                                                        bond->dev->dev_addr)) {
1611                                 swap_slave = tmp_slave;
1612                                 break;
1613                         }
1614                 }
1615         }
1616
1617         /*
1618          * Arrange for swap_slave and new_slave to temporarily be
1619          * ignored so we can mess with their MAC addresses without
1620          * fear of interference from transmit activity.
1621          */
1622         if (swap_slave) {
1623                 tlb_clear_slave(bond, swap_slave, 1);
1624         }
1625         tlb_clear_slave(bond, new_slave, 1);
1626
1627         write_unlock_bh(&bond->curr_slave_lock);
1628         read_unlock(&bond->lock);
1629
1630         ASSERT_RTNL();
1631
1632         /* curr_active_slave must be set before calling alb_swap_mac_addr */
1633         if (swap_slave) {
1634                 /* swap mac address */
1635                 alb_swap_mac_addr(bond, swap_slave, new_slave);
1636         } else {
1637                 /* set the new_slave to the bond mac address */
1638                 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1639                                        bond->alb_info.rlb_enabled);
1640         }
1641
1642         if (swap_slave) {
1643                 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1644                 read_lock(&bond->lock);
1645         } else {
1646                 read_lock(&bond->lock);
1647                 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1648         }
1649
1650         write_lock_bh(&bond->curr_slave_lock);
1651 }
1652
1653 /*
1654  * Called with RTNL
1655  */
1656 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1657         __acquires(&bond->lock)
1658         __releases(&bond->lock)
1659 {
1660         struct bonding *bond = netdev_priv(bond_dev);
1661         struct sockaddr *sa = addr;
1662         struct slave *slave, *swap_slave;
1663         int res;
1664         int i;
1665
1666         if (!is_valid_ether_addr(sa->sa_data)) {
1667                 return -EADDRNOTAVAIL;
1668         }
1669
1670         res = alb_set_mac_address(bond, addr);
1671         if (res) {
1672                 return res;
1673         }
1674
1675         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1676
1677         /* If there is no curr_active_slave there is nothing else to do.
1678          * Otherwise we'll need to pass the new address to it and handle
1679          * duplications.
1680          */
1681         if (!bond->curr_active_slave) {
1682                 return 0;
1683         }
1684
1685         swap_slave = NULL;
1686
1687         bond_for_each_slave(bond, slave, i) {
1688                 if (!compare_ether_addr_64bits(slave->dev->dev_addr,
1689                                                bond_dev->dev_addr)) {
1690                         swap_slave = slave;
1691                         break;
1692                 }
1693         }
1694
1695         if (swap_slave) {
1696                 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
1697                 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1698         } else {
1699                 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
1700                                        bond->alb_info.rlb_enabled);
1701
1702                 read_lock(&bond->lock);
1703                 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1704                 if (bond->alb_info.rlb_enabled) {
1705                         /* inform clients mac address has changed */
1706                         rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1707                 }
1708                 read_unlock(&bond->lock);
1709         }
1710
1711         return 0;
1712 }
1713
1714 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1715 {
1716         if (bond->alb_info.current_alb_vlan &&
1717             (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1718                 bond->alb_info.current_alb_vlan = NULL;
1719         }
1720
1721         if (bond->alb_info.rlb_enabled) {
1722                 rlb_clear_vlan(bond, vlan_id);
1723         }
1724 }
1725