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