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