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                 return -1;
 185
 186         _lock_tx_hashtbl_bh(bond);
 187
 188         bond_info->tx_hashtbl = new_hashtbl;
 189
 190         for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
 191                 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
 192         }
 193
 194         _unlock_tx_hashtbl_bh(bond);
 195
 196         return 0;
 197 }
 198
 199 /* Must be called only after all slaves have been released */
 200 static void tlb_deinitialize(struct bonding *bond)
 201 {
 202         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 203
 204         _lock_tx_hashtbl_bh(bond);
 205
 206         kfree(bond_info->tx_hashtbl);
 207         bond_info->tx_hashtbl = NULL;
 208
 209         _unlock_tx_hashtbl_bh(bond);
 210 }
 211
 212 static long long compute_gap(struct slave *slave)
 213 {
 214         return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
 215                (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
 216 }
 217
 218 /* Caller must hold bond lock for read */
 219 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
 220 {
 221         struct slave *slave, *least_loaded;
 222         long long max_gap;
 223         int i;
 224
 225         least_loaded = NULL;
 226         max_gap = LLONG_MIN;
 227
 228         /* Find the slave with the largest gap */
 229         bond_for_each_slave(bond, slave, i) {
 230                 if (SLAVE_IS_OK(slave)) {
 231                         long long gap = compute_gap(slave);
 232
 233                         if (max_gap < gap) {
 234                                 least_loaded = slave;
 235                                 max_gap = gap;
 236                         }
 237                 }
 238         }
 239
 240         return least_loaded;
 241 }
 242
 243 static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
 244                                                 u32 skb_len)
 245 {
 246         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 247         struct tlb_client_info *hash_table;
 248         struct slave *assigned_slave;
 249
 250         hash_table = bond_info->tx_hashtbl;
 251         assigned_slave = hash_table[hash_index].tx_slave;
 252         if (!assigned_slave) {
 253                 assigned_slave = tlb_get_least_loaded_slave(bond);
 254
 255                 if (assigned_slave) {
 256                         struct tlb_slave_info *slave_info =
 257                                 &(SLAVE_TLB_INFO(assigned_slave));
 258                         u32 next_index = slave_info->head;
 259
 260                         hash_table[hash_index].tx_slave = assigned_slave;
 261                         hash_table[hash_index].next = next_index;
 262                         hash_table[hash_index].prev = TLB_NULL_INDEX;
 263
 264                         if (next_index != TLB_NULL_INDEX) {
 265                                 hash_table[next_index].prev = hash_index;
 266                         }
 267
 268                         slave_info->head = hash_index;
 269                         slave_info->load +=
 270                                 hash_table[hash_index].load_history;
 271                 }
 272         }
 273
 274         if (assigned_slave) {
 275                 hash_table[hash_index].tx_bytes += skb_len;
 276         }
 277
 278         return assigned_slave;
 279 }
 280
 281 /* Caller must hold bond lock for read */
 282 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
 283                                         u32 skb_len)
 284 {
 285         struct slave *tx_slave;
 286         /*
 287          * We don't need to disable softirq here, becase
 288          * tlb_choose_channel() is only called by bond_alb_xmit()
 289          * which already has softirq disabled.
 290          */
 291         _lock_tx_hashtbl(bond);
 292         tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
 293         _unlock_tx_hashtbl(bond);
 294         return tx_slave;
 295 }
 296
 297 /*********************** rlb specific functions ***************************/
 298 static inline void _lock_rx_hashtbl_bh(struct bonding *bond)
 299 {
 300         spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 301 }
 302
 303 static inline void _unlock_rx_hashtbl_bh(struct bonding *bond)
 304 {
 305         spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 306 }
 307
 308 static inline void _lock_rx_hashtbl(struct bonding *bond)
 309 {
 310         spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 311 }
 312
 313 static inline void _unlock_rx_hashtbl(struct bonding *bond)
 314 {
 315         spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 316 }
 317
 318 /* when an ARP REPLY is received from a client update its info
 319  * in the rx_hashtbl
 320  */
 321 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
 322 {
 323         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 324         struct rlb_client_info *client_info;
 325         u32 hash_index;
 326
 327         _lock_rx_hashtbl_bh(bond);
 328
 329         hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
 330         client_info = &(bond_info->rx_hashtbl[hash_index]);
 331
 332         if ((client_info->assigned) &&
 333             (client_info->ip_src == arp->ip_dst) &&
 334             (client_info->ip_dst == arp->ip_src) &&
 335             (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
 336                 /* update the clients MAC address */
 337                 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
 338                 client_info->ntt = 1;
 339                 bond_info->rx_ntt = 1;
 340         }
 341
 342         _unlock_rx_hashtbl_bh(bond);
 343 }
 344
 345 static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
 346                         struct slave *slave)
 347 {
 348         struct arp_pkt *arp, _arp;
 349
 350         if (skb->protocol != cpu_to_be16(ETH_P_ARP))
 351                 goto out;
 352
 353         arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
 354         if (!arp)
 355                 goto out;
 356
 357         if (arp->op_code == htons(ARPOP_REPLY)) {
 358                 /* update rx hash table for this ARP */
 359                 rlb_update_entry_from_arp(bond, arp);
 360                 pr_debug("Server received an ARP Reply from client\n");
 361         }
 362 out:
 363         return RX_HANDLER_ANOTHER;
 364 }
 365
 366 /* Caller must hold bond lock for read */
 367 static struct slave *rlb_next_rx_slave(struct bonding *bond)
 368 {
 369         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 370         struct slave *rx_slave, *slave, *start_at;
 371         int i = 0;
 372
 373         if (bond_info->next_rx_slave) {
 374                 start_at = bond_info->next_rx_slave;
 375         } else {
 376                 start_at = bond->first_slave;
 377         }
 378
 379         rx_slave = NULL;
 380
 381         bond_for_each_slave_from(bond, slave, i, start_at) {
 382                 if (SLAVE_IS_OK(slave)) {
 383                         if (!rx_slave) {
 384                                 rx_slave = slave;
 385                         } else if (slave->speed > rx_slave->speed) {
 386                                 rx_slave = slave;
 387                         }
 388                 }
 389         }
 390
 391         if (rx_slave) {
 392                 bond_info->next_rx_slave = rx_slave->next;
 393         }
 394
 395         return rx_slave;
 396 }
 397
 398 /* teach the switch the mac of a disabled slave
 399  * on the primary for fault tolerance
 400  *
 401  * Caller must hold bond->curr_slave_lock for write or bond lock for write
 402  */
 403 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
 404 {
 405         if (!bond->curr_active_slave) {
 406                 return;
 407         }
 408
 409         if (!bond->alb_info.primary_is_promisc) {
 410                 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
 411                         bond->alb_info.primary_is_promisc = 1;
 412                 else
 413                         bond->alb_info.primary_is_promisc = 0;
 414         }
 415
 416         bond->alb_info.rlb_promisc_timeout_counter = 0;
 417
 418         alb_send_learning_packets(bond->curr_active_slave, addr);
 419 }
 420
 421 /* slave being removed should not be active at this point
 422  *
 423  * Caller must hold bond lock for read
 424  */
 425 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
 426 {
 427         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 428         struct rlb_client_info *rx_hash_table;
 429         u32 index, next_index;
 430
 431         /* clear slave from rx_hashtbl */
 432         _lock_rx_hashtbl_bh(bond);
 433
 434         rx_hash_table = bond_info->rx_hashtbl;
 435         index = bond_info->rx_hashtbl_head;
 436         for (; index != RLB_NULL_INDEX; index = next_index) {
 437                 next_index = rx_hash_table[index].next;
 438                 if (rx_hash_table[index].slave == slave) {
 439                         struct slave *assigned_slave = rlb_next_rx_slave(bond);
 440
 441                         if (assigned_slave) {
 442                                 rx_hash_table[index].slave = assigned_slave;
 443                                 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
 444                                                              mac_bcast)) {
 445                                         bond_info->rx_hashtbl[index].ntt = 1;
 446                                         bond_info->rx_ntt = 1;
 447                                         /* A slave has been removed from the
 448                                          * table because it is either disabled
 449                                          * or being released. We must retry the
 450                                          * update to avoid clients from not
 451                                          * being updated & disconnecting when
 452                                          * there is stress
 453                                          */
 454                                         bond_info->rlb_update_retry_counter =
 455                                                 RLB_UPDATE_RETRY;
 456                                 }
 457                         } else {  /* there is no active slave */
 458                                 rx_hash_table[index].slave = NULL;
 459                         }
 460                 }
 461         }
 462
 463         _unlock_rx_hashtbl_bh(bond);
 464
 465         write_lock_bh(&bond->curr_slave_lock);
 466
 467         if (slave != bond->curr_active_slave) {
 468                 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
 469         }
 470
 471         write_unlock_bh(&bond->curr_slave_lock);
 472 }
 473
 474 static void rlb_update_client(struct rlb_client_info *client_info)
 475 {
 476         int i;
 477
 478         if (!client_info->slave) {
 479                 return;
 480         }
 481
 482         for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
 483                 struct sk_buff *skb;
 484
 485                 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
 486                                  client_info->ip_dst,
 487                                  client_info->slave->dev,
 488                                  client_info->ip_src,
 489                                  client_info->mac_dst,
 490                                  client_info->slave->dev->dev_addr,
 491                                  client_info->mac_dst);
 492                 if (!skb) {
 493                         pr_err("%s: Error: failed to create an ARP packet\n",
 494                                client_info->slave->dev->master->name);
 495                         continue;
 496                 }
 497
 498                 skb->dev = client_info->slave->dev;
 499
 500                 if (client_info->tag) {
 501                         skb = vlan_put_tag(skb, client_info->vlan_id);
 502                         if (!skb) {
 503                                 pr_err("%s: Error: failed to insert VLAN tag\n",
 504                                        client_info->slave->dev->master->name);
 505                                 continue;
 506                         }
 507                 }
 508
 509                 arp_xmit(skb);
 510         }
 511 }
 512
 513 /* sends ARP REPLIES that update the clients that need updating */
 514 static void rlb_update_rx_clients(struct bonding *bond)
 515 {
 516         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 517         struct rlb_client_info *client_info;
 518         u32 hash_index;
 519
 520         _lock_rx_hashtbl_bh(bond);
 521
 522         hash_index = bond_info->rx_hashtbl_head;
 523         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 524                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 525                 if (client_info->ntt) {
 526                         rlb_update_client(client_info);
 527                         if (bond_info->rlb_update_retry_counter == 0) {
 528                                 client_info->ntt = 0;
 529                         }
 530                 }
 531         }
 532
 533         /* do not update the entries again until this counter is zero so that
 534          * not to confuse the clients.
 535          */
 536         bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
 537
 538         _unlock_rx_hashtbl_bh(bond);
 539 }
 540
 541 /* The slave was assigned a new mac address - update the clients */
 542 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
 543 {
 544         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 545         struct rlb_client_info *client_info;
 546         int ntt = 0;
 547         u32 hash_index;
 548
 549         _lock_rx_hashtbl_bh(bond);
 550
 551         hash_index = bond_info->rx_hashtbl_head;
 552         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 553                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 554
 555                 if ((client_info->slave == slave) &&
 556                     !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
 557                         client_info->ntt = 1;
 558                         ntt = 1;
 559                 }
 560         }
 561
 562         // update the team's flag only after the whole iteration
 563         if (ntt) {
 564                 bond_info->rx_ntt = 1;
 565                 //fasten the change
 566                 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
 567         }
 568
 569         _unlock_rx_hashtbl_bh(bond);
 570 }
 571
 572 /* mark all clients using src_ip to be updated */
 573 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
 574 {
 575         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 576         struct rlb_client_info *client_info;
 577         u32 hash_index;
 578
 579         _lock_rx_hashtbl(bond);
 580
 581         hash_index = bond_info->rx_hashtbl_head;
 582         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 583                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 584
 585                 if (!client_info->slave) {
 586                         pr_err("%s: Error: found a client with no channel in the client's hash table\n",
 587                                bond->dev->name);
 588                         continue;
 589                 }
 590                 /*update all clients using this src_ip, that are not assigned
 591                  * to the team's address (curr_active_slave) and have a known
 592                  * unicast mac address.
 593                  */
 594                 if ((client_info->ip_src == src_ip) &&
 595                     !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
 596                                              bond->dev->dev_addr) &&
 597                     !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
 598                         client_info->ntt = 1;
 599                         bond_info->rx_ntt = 1;
 600                 }
 601         }
 602
 603         _unlock_rx_hashtbl(bond);
 604 }
 605
 606 /* Caller must hold both bond and ptr locks for read */
 607 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
 608 {
 609         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 610         struct arp_pkt *arp = arp_pkt(skb);
 611         struct slave *assigned_slave;
 612         struct rlb_client_info *client_info;
 613         u32 hash_index = 0;
 614
 615         _lock_rx_hashtbl(bond);
 616
 617         hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
 618         client_info = &(bond_info->rx_hashtbl[hash_index]);
 619
 620         if (client_info->assigned) {
 621                 if ((client_info->ip_src == arp->ip_src) &&
 622                     (client_info->ip_dst == arp->ip_dst)) {
 623                         /* the entry is already assigned to this client */
 624                         if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
 625                                 /* update mac address from arp */
 626                                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
 627                         }
 628
 629                         assigned_slave = client_info->slave;
 630                         if (assigned_slave) {
 631                                 _unlock_rx_hashtbl(bond);
 632                                 return assigned_slave;
 633                         }
 634                 } else {
 635                         /* the entry is already assigned to some other client,
 636                          * move the old client to primary (curr_active_slave) so
 637                          * that the new client can be assigned to this entry.
 638                          */
 639                         if (bond->curr_active_slave &&
 640                             client_info->slave != bond->curr_active_slave) {
 641                                 client_info->slave = bond->curr_active_slave;
 642                                 rlb_update_client(client_info);
 643                         }
 644                 }
 645         }
 646         /* assign a new slave */
 647         assigned_slave = rlb_next_rx_slave(bond);
 648
 649         if (assigned_slave) {
 650                 client_info->ip_src = arp->ip_src;
 651                 client_info->ip_dst = arp->ip_dst;
 652                 /* arp->mac_dst is broadcast for arp reqeusts.
 653                  * will be updated with clients actual unicast mac address
 654                  * upon receiving an arp reply.
 655                  */
 656                 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
 657                 client_info->slave = assigned_slave;
 658
 659                 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
 660                         client_info->ntt = 1;
 661                         bond->alb_info.rx_ntt = 1;
 662                 } else {
 663                         client_info->ntt = 0;
 664                 }
 665
 666                 if (bond_vlan_used(bond)) {
 667                         if (!vlan_get_tag(skb, &client_info->vlan_id))
 668                                 client_info->tag = 1;
 669                 }
 670
 671                 if (!client_info->assigned) {
 672                         u32 prev_tbl_head = bond_info->rx_hashtbl_head;
 673                         bond_info->rx_hashtbl_head = hash_index;
 674                         client_info->next = prev_tbl_head;
 675                         if (prev_tbl_head != RLB_NULL_INDEX) {
 676                                 bond_info->rx_hashtbl[prev_tbl_head].prev =
 677                                         hash_index;
 678                         }
 679                         client_info->assigned = 1;
 680                 }
 681         }
 682
 683         _unlock_rx_hashtbl(bond);
 684
 685         return assigned_slave;
 686 }
 687
 688 /* chooses (and returns) transmit channel for arp reply
 689  * does not choose channel for other arp types since they are
 690  * sent on the curr_active_slave
 691  */
 692 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
 693 {
 694         struct arp_pkt *arp = arp_pkt(skb);
 695         struct slave *tx_slave = NULL;
 696
 697         if (arp->op_code == htons(ARPOP_REPLY)) {
 698                 /* the arp must be sent on the selected
 699                 * rx channel
 700                 */
 701                 tx_slave = rlb_choose_channel(skb, bond);
 702                 if (tx_slave) {
 703                         memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
 704                 }
 705                 pr_debug("Server sent ARP Reply packet\n");
 706         } else if (arp->op_code == htons(ARPOP_REQUEST)) {
 707                 /* Create an entry in the rx_hashtbl for this client as a
 708                  * place holder.
 709                  * When the arp reply is received the entry will be updated
 710                  * with the correct unicast address of the client.
 711                  */
 712                 rlb_choose_channel(skb, bond);
 713
 714                 /* The ARP reply packets must be delayed so that
 715                  * they can cancel out the influence of the ARP request.
 716                  */
 717                 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
 718
 719                 /* arp requests are broadcast and are sent on the primary
 720                  * the arp request will collapse all clients on the subnet to
 721                  * the primary slave. We must register these clients to be
 722                  * updated with their assigned mac.
 723                  */
 724                 rlb_req_update_subnet_clients(bond, arp->ip_src);
 725                 pr_debug("Server sent ARP Request packet\n");
 726         }
 727
 728         return tx_slave;
 729 }
 730
 731 /* Caller must hold bond lock for read */
 732 static void rlb_rebalance(struct bonding *bond)
 733 {
 734         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 735         struct slave *assigned_slave;
 736         struct rlb_client_info *client_info;
 737         int ntt;
 738         u32 hash_index;
 739
 740         _lock_rx_hashtbl_bh(bond);
 741
 742         ntt = 0;
 743         hash_index = bond_info->rx_hashtbl_head;
 744         for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
 745                 client_info = &(bond_info->rx_hashtbl[hash_index]);
 746                 assigned_slave = rlb_next_rx_slave(bond);
 747                 if (assigned_slave && (client_info->slave != assigned_slave)) {
 748                         client_info->slave = assigned_slave;
 749                         client_info->ntt = 1;
 750                         ntt = 1;
 751                 }
 752         }
 753
 754         /* update the team's flag only after the whole iteration */
 755         if (ntt) {
 756                 bond_info->rx_ntt = 1;
 757         }
 758         _unlock_rx_hashtbl_bh(bond);
 759 }
 760
 761 /* Caller must hold rx_hashtbl lock */
 762 static void rlb_init_table_entry(struct rlb_client_info *entry)
 763 {
 764         memset(entry, 0, sizeof(struct rlb_client_info));
 765         entry->next = RLB_NULL_INDEX;
 766         entry->prev = RLB_NULL_INDEX;
 767 }
 768
 769 static int rlb_initialize(struct bonding *bond)
 770 {
 771         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 772         struct rlb_client_info  *new_hashtbl;
 773         int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
 774         int i;
 775
 776         new_hashtbl = kmalloc(size, GFP_KERNEL);
 777         if (!new_hashtbl)
 778                 return -1;
 779
 780         _lock_rx_hashtbl_bh(bond);
 781
 782         bond_info->rx_hashtbl = new_hashtbl;
 783
 784         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
 785
 786         for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
 787                 rlb_init_table_entry(bond_info->rx_hashtbl + i);
 788         }
 789
 790         _unlock_rx_hashtbl_bh(bond);
 791
 792         /* register to receive ARPs */
 793         bond->recv_probe = rlb_arp_recv;
 794
 795         return 0;
 796 }
 797
 798 static void rlb_deinitialize(struct bonding *bond)
 799 {
 800         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 801
 802         _lock_rx_hashtbl_bh(bond);
 803
 804         kfree(bond_info->rx_hashtbl);
 805         bond_info->rx_hashtbl = NULL;
 806         bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
 807
 808         _unlock_rx_hashtbl_bh(bond);
 809 }
 810
 811 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
 812 {
 813         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 814         u32 curr_index;
 815
 816         _lock_rx_hashtbl_bh(bond);
 817
 818         curr_index = bond_info->rx_hashtbl_head;
 819         while (curr_index != RLB_NULL_INDEX) {
 820                 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
 821                 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
 822                 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
 823
 824                 if (curr->tag && (curr->vlan_id == vlan_id)) {
 825                         if (curr_index == bond_info->rx_hashtbl_head) {
 826                                 bond_info->rx_hashtbl_head = next_index;
 827                         }
 828                         if (prev_index != RLB_NULL_INDEX) {
 829                                 bond_info->rx_hashtbl[prev_index].next = next_index;
 830                         }
 831                         if (next_index != RLB_NULL_INDEX) {
 832                                 bond_info->rx_hashtbl[next_index].prev = prev_index;
 833                         }
 834
 835                         rlb_init_table_entry(curr);
 836                 }
 837
 838                 curr_index = next_index;
 839         }
 840
 841         _unlock_rx_hashtbl_bh(bond);
 842 }
 843
 844 /*********************** tlb/rlb shared functions *********************/
 845
 846 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
 847 {
 848         struct bonding *bond = bond_get_bond_by_slave(slave);
 849         struct learning_pkt pkt;
 850         int size = sizeof(struct learning_pkt);
 851         int i;
 852
 853         memset(&pkt, 0, size);
 854         memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
 855         memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
 856         pkt.type = cpu_to_be16(ETH_P_LOOP);
 857
 858         for (i = 0; i < MAX_LP_BURST; i++) {
 859                 struct sk_buff *skb;
 860                 char *data;
 861
 862                 skb = dev_alloc_skb(size);
 863                 if (!skb) {
 864                         return;
 865                 }
 866
 867                 data = skb_put(skb, size);
 868                 memcpy(data, &pkt, size);
 869
 870                 skb_reset_mac_header(skb);
 871                 skb->network_header = skb->mac_header + ETH_HLEN;
 872                 skb->protocol = pkt.type;
 873                 skb->priority = TC_PRIO_CONTROL;
 874                 skb->dev = slave->dev;
 875
 876                 if (bond_vlan_used(bond)) {
 877                         struct vlan_entry *vlan;
 878
 879                         vlan = bond_next_vlan(bond,
 880                                               bond->alb_info.current_alb_vlan);
 881
 882                         bond->alb_info.current_alb_vlan = vlan;
 883                         if (!vlan) {
 884                                 kfree_skb(skb);
 885                                 continue;
 886                         }
 887
 888                         skb = vlan_put_tag(skb, vlan->vlan_id);
 889                         if (!skb) {
 890                                 pr_err("%s: Error: failed to insert VLAN tag\n",
 891                                        bond->dev->name);
 892                                 continue;
 893                         }
 894                 }
 895
 896                 dev_queue_xmit(skb);
 897         }
 898 }
 899
 900 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
 901 {
 902         struct net_device *dev = slave->dev;
 903         struct sockaddr s_addr;
 904
 905         if (slave->bond->params.mode == BOND_MODE_TLB) {
 906                 memcpy(dev->dev_addr, addr, dev->addr_len);
 907                 return 0;
 908         }
 909
 910         /* for rlb each slave must have a unique hw mac addresses so that */
 911         /* each slave will receive packets destined to a different mac */
 912         memcpy(s_addr.sa_data, addr, dev->addr_len);
 913         s_addr.sa_family = dev->type;
 914         if (dev_set_mac_address(dev, &s_addr)) {
 915                 pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
 916                        "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
 917                        dev->master->name, dev->name);
 918                 return -EOPNOTSUPP;
 919         }
 920         return 0;
 921 }
 922
 923 /*
 924  * Swap MAC addresses between two slaves.
 925  *
 926  * Called with RTNL held, and no other locks.
 927  *
 928  */
 929
 930 static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
 931 {
 932         u8 tmp_mac_addr[ETH_ALEN];
 933
 934         memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
 935         alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
 936         alb_set_slave_mac_addr(slave2, tmp_mac_addr);
 937
 938 }
 939
 940 /*
 941  * Send learning packets after MAC address swap.
 942  *
 943  * Called with RTNL and no other locks
 944  */
 945 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
 946                                 struct slave *slave2)
 947 {
 948         int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
 949         struct slave *disabled_slave = NULL;
 950
 951         ASSERT_RTNL();
 952
 953         /* fasten the change in the switch */
 954         if (SLAVE_IS_OK(slave1)) {
 955                 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
 956                 if (bond->alb_info.rlb_enabled) {
 957                         /* inform the clients that the mac address
 958                          * has changed
 959                          */
 960                         rlb_req_update_slave_clients(bond, slave1);
 961                 }
 962         } else {
 963                 disabled_slave = slave1;
 964         }
 965
 966         if (SLAVE_IS_OK(slave2)) {
 967                 alb_send_learning_packets(slave2, slave2->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, slave2);
 973                 }
 974         } else {
 975                 disabled_slave = slave2;
 976         }
 977
 978         if (bond->alb_info.rlb_enabled && slaves_state_differ) {
 979                 /* A disabled slave was assigned an active mac addr */
 980                 rlb_teach_disabled_mac_on_primary(bond,
 981                                                   disabled_slave->dev->dev_addr);
 982         }
 983 }
 984
 985 /**
 986  * alb_change_hw_addr_on_detach
 987  * @bond: bonding we're working on
 988  * @slave: the slave that was just detached
 989  *
 990  * We assume that @slave was already detached from the slave list.
 991  *
 992  * If @slave's permanent hw address is different both from its current
 993  * address and from @bond's address, then somewhere in the bond there's
 994  * a slave that has @slave's permanet address as its current address.
 995  * We'll make sure that that slave no longer uses @slave's permanent address.
 996  *
 997  * Caller must hold RTNL and no other locks
 998  */
 999 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1000 {
1001         int perm_curr_diff;
1002         int perm_bond_diff;
1003
1004         perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1005                                                   slave->dev->dev_addr);
1006         perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1007                                                   bond->dev->dev_addr);
1008
1009         if (perm_curr_diff && perm_bond_diff) {
1010                 struct slave *tmp_slave;
1011                 int i, found = 0;
1012
1013                 bond_for_each_slave(bond, tmp_slave, i) {
1014                         if (ether_addr_equal_64bits(slave->perm_hwaddr,
1015                                                     tmp_slave->dev->dev_addr)) {
1016                                 found = 1;
1017                                 break;
1018                         }
1019                 }
1020
1021                 if (found) {
1022                         /* locking: needs RTNL and nothing else */
1023                         alb_swap_mac_addr(bond, slave, tmp_slave);
1024                         alb_fasten_mac_swap(bond, slave, tmp_slave);
1025                 }
1026         }
1027 }
1028
1029 /**
1030  * alb_handle_addr_collision_on_attach
1031  * @bond: bonding we're working on
1032  * @slave: the slave that was just attached
1033  *
1034  * checks uniqueness of slave's mac address and handles the case the
1035  * new slave uses the bonds mac address.
1036  *
1037  * If the permanent hw address of @slave is @bond's hw address, we need to
1038  * find a different hw address to give @slave, that isn't in use by any other
1039  * slave in the bond. This address must be, of course, one of the permanent
1040  * addresses of the other slaves.
1041  *
1042  * We go over the slave list, and for each slave there we compare its
1043  * permanent hw address with the current address of all the other slaves.
1044  * If no match was found, then we've found a slave with a permanent address
1045  * that isn't used by any other slave in the bond, so we can assign it to
1046  * @slave.
1047  *
1048  * assumption: this function is called before @slave is attached to the
1049  *             bond slave list.
1050  *
1051  * caller must hold the bond lock for write since the mac addresses are compared
1052  * and may be swapped.
1053  */
1054 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1055 {
1056         struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1057         struct slave *has_bond_addr = bond->curr_active_slave;
1058         int i, j, found = 0;
1059
1060         if (bond->slave_cnt == 0) {
1061                 /* this is the first slave */
1062                 return 0;
1063         }
1064
1065         /* if slave's mac address differs from bond's mac address
1066          * check uniqueness of slave's mac address against the other
1067          * slaves in the bond.
1068          */
1069         if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1070                 bond_for_each_slave(bond, tmp_slave1, i) {
1071                         if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1072                                                     slave->dev->dev_addr)) {
1073                                 found = 1;
1074                                 break;
1075                         }
1076                 }
1077
1078                 if (!found)
1079                         return 0;
1080
1081                 /* Try setting slave mac to bond address and fall-through
1082                    to code handling that situation below... */
1083                 alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
1084         }
1085
1086         /* The slave's address is equal to the address of the bond.
1087          * Search for a spare address in the bond for this slave.
1088          */
1089         free_mac_slave = NULL;
1090
1091         bond_for_each_slave(bond, tmp_slave1, i) {
1092                 found = 0;
1093                 bond_for_each_slave(bond, tmp_slave2, j) {
1094                         if (ether_addr_equal_64bits(tmp_slave1->perm_hwaddr,
1095                                                     tmp_slave2->dev->dev_addr)) {
1096                                 found = 1;
1097                                 break;
1098                         }
1099                 }
1100
1101                 if (!found) {
1102                         /* no slave has tmp_slave1's perm addr
1103                          * as its curr addr
1104                          */
1105                         free_mac_slave = tmp_slave1;
1106                         break;
1107                 }
1108
1109                 if (!has_bond_addr) {
1110                         if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1111                                                     bond->dev->dev_addr)) {
1112
1113                                 has_bond_addr = tmp_slave1;
1114                         }
1115                 }
1116         }
1117
1118         if (free_mac_slave) {
1119                 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
1120
1121                 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1122                            bond->dev->name, slave->dev->name,
1123                            free_mac_slave->dev->name);
1124
1125         } else if (has_bond_addr) {
1126                 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",
1127                        bond->dev->name, slave->dev->name);
1128                 return -EFAULT;
1129         }
1130
1131         return 0;
1132 }
1133
1134 /**
1135  * alb_set_mac_address
1136  * @bond:
1137  * @addr:
1138  *
1139  * In TLB mode all slaves are configured to the bond's hw address, but set
1140  * their dev_addr field to different addresses (based on their permanent hw
1141  * addresses).
1142  *
1143  * For each slave, this function sets the interface to the new address and then
1144  * changes its dev_addr field to its previous value.
1145  *
1146  * Unwinding assumes bond's mac address has not yet changed.
1147  */
1148 static int alb_set_mac_address(struct bonding *bond, void *addr)
1149 {
1150         struct sockaddr sa;
1151         struct slave *slave, *stop_at;
1152         char tmp_addr[ETH_ALEN];
1153         int res;
1154         int i;
1155
1156         if (bond->alb_info.rlb_enabled) {
1157                 return 0;
1158         }
1159
1160         bond_for_each_slave(bond, slave, i) {
1161                 /* save net_device's current hw address */
1162                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1163
1164                 res = dev_set_mac_address(slave->dev, addr);
1165
1166                 /* restore net_device's hw address */
1167                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1168
1169                 if (res)
1170                         goto unwind;
1171         }
1172
1173         return 0;
1174
1175 unwind:
1176         memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1177         sa.sa_family = bond->dev->type;
1178
1179         /* unwind from head to the slave that failed */
1180         stop_at = slave;
1181         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1182                 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1183                 dev_set_mac_address(slave->dev, &sa);
1184                 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1185         }
1186
1187         return res;
1188 }
1189
1190 /************************ exported alb funcions ************************/
1191
1192 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1193 {
1194         int res;
1195
1196         res = tlb_initialize(bond);
1197         if (res) {
1198                 return res;
1199         }
1200
1201         if (rlb_enabled) {
1202                 bond->alb_info.rlb_enabled = 1;
1203                 /* initialize rlb */
1204                 res = rlb_initialize(bond);
1205                 if (res) {
1206                         tlb_deinitialize(bond);
1207                         return res;
1208                 }
1209         } else {
1210                 bond->alb_info.rlb_enabled = 0;
1211         }
1212
1213         return 0;
1214 }
1215
1216 void bond_alb_deinitialize(struct bonding *bond)
1217 {
1218         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1219
1220         tlb_deinitialize(bond);
1221
1222         if (bond_info->rlb_enabled) {
1223                 rlb_deinitialize(bond);
1224         }
1225 }
1226
1227 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1228 {
1229         struct bonding *bond = netdev_priv(bond_dev);
1230         struct ethhdr *eth_data;
1231         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1232         struct slave *tx_slave = NULL;
1233         static const __be32 ip_bcast = htonl(0xffffffff);
1234         int hash_size = 0;
1235         int do_tx_balance = 1;
1236         u32 hash_index = 0;
1237         const u8 *hash_start = NULL;
1238         int res = 1;
1239         struct ipv6hdr *ip6hdr;
1240
1241         skb_reset_mac_header(skb);
1242         eth_data = eth_hdr(skb);
1243
1244         /* make sure that the curr_active_slave do not change during tx
1245          */
1246         read_lock(&bond->curr_slave_lock);
1247
1248         switch (ntohs(skb->protocol)) {
1249         case ETH_P_IP: {
1250                 const struct iphdr *iph = ip_hdr(skb);
1251
1252                 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1253                     (iph->daddr == ip_bcast) ||
1254                     (iph->protocol == IPPROTO_IGMP)) {
1255                         do_tx_balance = 0;
1256                         break;
1257                 }
1258                 hash_start = (char *)&(iph->daddr);
1259                 hash_size = sizeof(iph->daddr);
1260         }
1261                 break;
1262         case ETH_P_IPV6:
1263                 /* IPv6 doesn't really use broadcast mac address, but leave
1264                  * that here just in case.
1265                  */
1266                 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1267                         do_tx_balance = 0;
1268                         break;
1269                 }
1270
1271                 /* IPv6 uses all-nodes multicast as an equivalent to
1272                  * broadcasts in IPv4.
1273                  */
1274                 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1275                         do_tx_balance = 0;
1276                         break;
1277                 }
1278
1279                 /* Additianally, DAD probes should not be tx-balanced as that
1280                  * will lead to false positives for duplicate addresses and
1281                  * prevent address configuration from working.
1282                  */
1283                 ip6hdr = ipv6_hdr(skb);
1284                 if (ipv6_addr_any(&ip6hdr->saddr)) {
1285                         do_tx_balance = 0;
1286                         break;
1287                 }
1288
1289                 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1290                 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1291                 break;
1292         case ETH_P_IPX:
1293                 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1294                         /* something is wrong with this packet */
1295                         do_tx_balance = 0;
1296                         break;
1297                 }
1298
1299                 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1300                         /* The only protocol worth balancing in
1301                          * this family since it has an "ARP" like
1302                          * mechanism
1303                          */
1304                         do_tx_balance = 0;
1305                         break;
1306                 }
1307
1308                 hash_start = (char*)eth_data->h_dest;
1309                 hash_size = ETH_ALEN;
1310                 break;
1311         case ETH_P_ARP:
1312                 do_tx_balance = 0;
1313                 if (bond_info->rlb_enabled) {
1314                         tx_slave = rlb_arp_xmit(skb, bond);
1315                 }
1316                 break;
1317         default:
1318                 do_tx_balance = 0;
1319                 break;
1320         }
1321
1322         if (do_tx_balance) {
1323                 hash_index = _simple_hash(hash_start, hash_size);
1324                 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1325         }
1326
1327         if (!tx_slave) {
1328                 /* unbalanced or unassigned, send through primary */
1329                 tx_slave = bond->curr_active_slave;
1330                 bond_info->unbalanced_load += skb->len;
1331         }
1332
1333         if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1334                 if (tx_slave != bond->curr_active_slave) {
1335                         memcpy(eth_data->h_source,
1336                                tx_slave->dev->dev_addr,
1337                                ETH_ALEN);
1338                 }
1339
1340                 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1341         } else {
1342                 if (tx_slave) {
1343                         _lock_tx_hashtbl(bond);
1344                         __tlb_clear_slave(bond, tx_slave, 0);
1345                         _unlock_tx_hashtbl(bond);
1346                 }
1347         }
1348
1349         read_unlock(&bond->curr_slave_lock);
1350
1351         if (res) {
1352                 /* no suitable interface, frame not sent */
1353                 kfree_skb(skb);
1354         }
1355         return NETDEV_TX_OK;
1356 }
1357
1358 void bond_alb_monitor(struct work_struct *work)
1359 {
1360         struct bonding *bond = container_of(work, struct bonding,
1361                                             alb_work.work);
1362         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1363         struct slave *slave;
1364         int i;
1365
1366         read_lock(&bond->lock);
1367
1368         if (bond->slave_cnt == 0) {
1369                 bond_info->tx_rebalance_counter = 0;
1370                 bond_info->lp_counter = 0;
1371                 goto re_arm;
1372         }
1373
1374         bond_info->tx_rebalance_counter++;
1375         bond_info->lp_counter++;
1376
1377         /* send learning packets */
1378         if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1379                 /* change of curr_active_slave involves swapping of mac addresses.
1380                  * in order to avoid this swapping from happening while
1381                  * sending the learning packets, the curr_slave_lock must be held for
1382                  * read.
1383                  */
1384                 read_lock(&bond->curr_slave_lock);
1385
1386                 bond_for_each_slave(bond, slave, i) {
1387                         alb_send_learning_packets(slave, slave->dev->dev_addr);
1388                 }
1389
1390                 read_unlock(&bond->curr_slave_lock);
1391
1392                 bond_info->lp_counter = 0;
1393         }
1394
1395         /* rebalance tx traffic */
1396         if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1397
1398                 read_lock(&bond->curr_slave_lock);
1399
1400                 bond_for_each_slave(bond, slave, i) {
1401                         tlb_clear_slave(bond, slave, 1);
1402                         if (slave == bond->curr_active_slave) {
1403                                 SLAVE_TLB_INFO(slave).load =
1404                                         bond_info->unbalanced_load /
1405                                                 BOND_TLB_REBALANCE_INTERVAL;
1406                                 bond_info->unbalanced_load = 0;
1407                         }
1408                 }
1409
1410                 read_unlock(&bond->curr_slave_lock);
1411
1412                 bond_info->tx_rebalance_counter = 0;
1413         }
1414
1415         /* handle rlb stuff */
1416         if (bond_info->rlb_enabled) {
1417                 if (bond_info->primary_is_promisc &&
1418                     (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1419
1420                         /*
1421                          * dev_set_promiscuity requires rtnl and
1422                          * nothing else.  Avoid race with bond_close.
1423                          */
1424                         read_unlock(&bond->lock);
1425                         if (!rtnl_trylock()) {
1426                                 read_lock(&bond->lock);
1427                                 goto re_arm;
1428                         }
1429
1430                         bond_info->rlb_promisc_timeout_counter = 0;
1431
1432                         /* If the primary was set to promiscuous mode
1433                          * because a slave was disabled then
1434                          * it can now leave promiscuous mode.
1435                          */
1436                         dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1437                         bond_info->primary_is_promisc = 0;
1438
1439                         rtnl_unlock();
1440                         read_lock(&bond->lock);
1441                 }
1442
1443                 if (bond_info->rlb_rebalance) {
1444                         bond_info->rlb_rebalance = 0;
1445                         rlb_rebalance(bond);
1446                 }
1447
1448                 /* check if clients need updating */
1449                 if (bond_info->rx_ntt) {
1450                         if (bond_info->rlb_update_delay_counter) {
1451                                 --bond_info->rlb_update_delay_counter;
1452                         } else {
1453                                 rlb_update_rx_clients(bond);
1454                                 if (bond_info->rlb_update_retry_counter) {
1455                                         --bond_info->rlb_update_retry_counter;
1456                                 } else {
1457                                         bond_info->rx_ntt = 0;
1458                                 }
1459                         }
1460                 }
1461         }
1462
1463 re_arm:
1464         queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1465
1466         read_unlock(&bond->lock);
1467 }
1468
1469 /* assumption: called before the slave is attached to the bond
1470  * and not locked by the bond lock
1471  */
1472 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1473 {
1474         int res;
1475
1476         res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
1477         if (res) {
1478                 return res;
1479         }
1480
1481         /* caller must hold the bond lock for write since the mac addresses
1482          * are compared and may be swapped.
1483          */
1484         read_lock(&bond->lock);
1485
1486         res = alb_handle_addr_collision_on_attach(bond, slave);
1487
1488         read_unlock(&bond->lock);
1489
1490         if (res) {
1491                 return res;
1492         }
1493
1494         tlb_init_slave(slave);
1495
1496         /* order a rebalance ASAP */
1497         bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1498
1499         if (bond->alb_info.rlb_enabled) {
1500                 bond->alb_info.rlb_rebalance = 1;
1501         }
1502
1503         return 0;
1504 }
1505
1506 /*
1507  * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1508  * if necessary.
1509  *
1510  * Caller must hold RTNL and no other locks
1511  */
1512 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1513 {
1514         if (bond->slave_cnt > 1) {
1515                 alb_change_hw_addr_on_detach(bond, slave);
1516         }
1517
1518         tlb_clear_slave(bond, slave, 0);
1519
1520         if (bond->alb_info.rlb_enabled) {
1521                 bond->alb_info.next_rx_slave = NULL;
1522                 rlb_clear_slave(bond, slave);
1523         }
1524 }
1525
1526 /* Caller must hold bond lock for read */
1527 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1528 {
1529         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1530
1531         if (link == BOND_LINK_DOWN) {
1532                 tlb_clear_slave(bond, slave, 0);
1533                 if (bond->alb_info.rlb_enabled) {
1534                         rlb_clear_slave(bond, slave);
1535                 }
1536         } else if (link == BOND_LINK_UP) {
1537                 /* order a rebalance ASAP */
1538                 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1539                 if (bond->alb_info.rlb_enabled) {
1540                         bond->alb_info.rlb_rebalance = 1;
1541                         /* If the updelay module parameter is smaller than the
1542                          * forwarding delay of the switch the rebalance will
1543                          * not work because the rebalance arp replies will
1544                          * not be forwarded to the clients..
1545                          */
1546                 }
1547         }
1548 }
1549
1550 /**
1551  * bond_alb_handle_active_change - assign new curr_active_slave
1552  * @bond: our bonding struct
1553  * @new_slave: new slave to assign
1554  *
1555  * Set the bond->curr_active_slave to @new_slave and handle
1556  * mac address swapping and promiscuity changes as needed.
1557  *
1558  * If new_slave is NULL, caller must hold curr_slave_lock or
1559  * bond->lock for write.
1560  *
1561  * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1562  * read and curr_slave_lock for write.  Processing here may sleep, so
1563  * no other locks may be held.
1564  */
1565 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1566         __releases(&bond->curr_slave_lock)
1567         __releases(&bond->lock)
1568         __acquires(&bond->lock)
1569         __acquires(&bond->curr_slave_lock)
1570 {
1571         struct slave *swap_slave;
1572         int i;
1573
1574         if (bond->curr_active_slave == new_slave) {
1575                 return;
1576         }
1577
1578         if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1579                 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1580                 bond->alb_info.primary_is_promisc = 0;
1581                 bond->alb_info.rlb_promisc_timeout_counter = 0;
1582         }
1583
1584         swap_slave = bond->curr_active_slave;
1585         bond->curr_active_slave = new_slave;
1586
1587         if (!new_slave || (bond->slave_cnt == 0)) {
1588                 return;
1589         }
1590
1591         /* set the new curr_active_slave to the bonds mac address
1592          * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1593          */
1594         if (!swap_slave) {
1595                 struct slave *tmp_slave;
1596                 /* find slave that is holding the bond's mac address */
1597                 bond_for_each_slave(bond, tmp_slave, i) {
1598                         if (ether_addr_equal_64bits(tmp_slave->dev->dev_addr,
1599                                                     bond->dev->dev_addr)) {
1600                                 swap_slave = tmp_slave;
1601                                 break;
1602                         }
1603                 }
1604         }
1605
1606         /*
1607          * Arrange for swap_slave and new_slave to temporarily be
1608          * ignored so we can mess with their MAC addresses without
1609          * fear of interference from transmit activity.
1610          */
1611         if (swap_slave) {
1612                 tlb_clear_slave(bond, swap_slave, 1);
1613         }
1614         tlb_clear_slave(bond, new_slave, 1);
1615
1616         write_unlock_bh(&bond->curr_slave_lock);
1617         read_unlock(&bond->lock);
1618
1619         ASSERT_RTNL();
1620
1621         /* curr_active_slave must be set before calling alb_swap_mac_addr */
1622         if (swap_slave) {
1623                 /* swap mac address */
1624                 alb_swap_mac_addr(bond, swap_slave, new_slave);
1625         } else {
1626                 /* set the new_slave to the bond mac address */
1627                 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
1628         }
1629
1630         if (swap_slave) {
1631                 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1632                 read_lock(&bond->lock);
1633         } else {
1634                 read_lock(&bond->lock);
1635                 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1636         }
1637
1638         write_lock_bh(&bond->curr_slave_lock);
1639 }
1640
1641 /*
1642  * Called with RTNL
1643  */
1644 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1645         __acquires(&bond->lock)
1646         __releases(&bond->lock)
1647 {
1648         struct bonding *bond = netdev_priv(bond_dev);
1649         struct sockaddr *sa = addr;
1650         struct slave *slave, *swap_slave;
1651         int res;
1652         int i;
1653
1654         if (!is_valid_ether_addr(sa->sa_data)) {
1655                 return -EADDRNOTAVAIL;
1656         }
1657
1658         res = alb_set_mac_address(bond, addr);
1659         if (res) {
1660                 return res;
1661         }
1662
1663         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1664
1665         /* If there is no curr_active_slave there is nothing else to do.
1666          * Otherwise we'll need to pass the new address to it and handle
1667          * duplications.
1668          */
1669         if (!bond->curr_active_slave) {
1670                 return 0;
1671         }
1672
1673         swap_slave = NULL;
1674
1675         bond_for_each_slave(bond, slave, i) {
1676                 if (ether_addr_equal_64bits(slave->dev->dev_addr,
1677                                             bond_dev->dev_addr)) {
1678                         swap_slave = slave;
1679                         break;
1680                 }
1681         }
1682
1683         if (swap_slave) {
1684                 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
1685                 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1686         } else {
1687                 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr);
1688
1689                 read_lock(&bond->lock);
1690                 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1691                 if (bond->alb_info.rlb_enabled) {
1692                         /* inform clients mac address has changed */
1693                         rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1694                 }
1695                 read_unlock(&bond->lock);
1696         }
1697
1698         return 0;
1699 }
1700
1701 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1702 {
1703         if (bond->alb_info.current_alb_vlan &&
1704             (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1705                 bond->alb_info.current_alb_vlan = NULL;
1706         }
1707
1708         if (bond->alb_info.rlb_enabled) {
1709                 rlb_clear_vlan(bond, vlan_id);
1710         }
1711 }
1712