Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | u16 type; |
| 91 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
| 92 | }; |
| 93 | |
| 94 | struct arp_pkt { |
| 95 | u16 hw_addr_space; |
| 96 | u16 prot_addr_space; |
| 97 | u8 hw_addr_len; |
| 98 | u8 prot_addr_len; |
| 99 | u16 op_code; |
| 100 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
| 101 | u32 ip_src; /* sender IP address */ |
| 102 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
| 103 | u32 ip_dst; /* target IP address */ |
| 104 | }; |
| 105 | #pragma pack() |
| 106 | |
Arnaldo Carvalho de Melo | a16aeb3 | 2007-03-10 16:07:19 -0300 | [diff] [blame] | 107 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
| 108 | { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 109 | return (struct arp_pkt *)skb_network_header(skb); |
Arnaldo Carvalho de Melo | a16aeb3 | 2007-03-10 16:07:19 -0300 | [diff] [blame] | 110 | } |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | /* Forward declaration */ |
| 113 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); |
| 114 | |
| 115 | static inline u8 _simple_hash(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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | tlb_init_slave(slave); |
Jay Vosburgh | 5af47b2 | 2006-01-09 12:14:00 -0800 | [diff] [blame] | 178 | |
| 179 | _unlock_tx_hashtbl(bond); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Mitch Williams | 0d206a3 | 2005-11-09 10:35:30 -0800 | [diff] [blame] | 187 | struct tlb_client_info *new_hashtbl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | int i; |
| 189 | |
| 190 | spin_lock_init(&(bond_info->tx_hashtbl_lock)); |
| 191 | |
Joe Jin | 243cb4e | 2007-02-06 14:16:40 -0800 | [diff] [blame] | 192 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
Mitch Williams | 0d206a3 | 2005-11-09 10:35:30 -0800 | [diff] [blame] | 193 | if (!new_hashtbl) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 195 | ": %s: Error: Failed to allocate TLB hash table\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | bond->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | return -1; |
| 198 | } |
Mitch Williams | 0d206a3 | 2005-11-09 10:35:30 -0800 | [diff] [blame] | 199 | _lock_tx_hashtbl(bond); |
| 200 | |
| 201 | bond_info->tx_hashtbl = new_hashtbl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 342 | static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 348 | if (!(bond_dev->flags & IFF_MASTER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | if (!arp) { |
| 352 | dprintk("Packet has no ARP data\n"); |
| 353 | goto out; |
| 354 | } |
| 355 | |
| 356 | if (skb->len < sizeof(struct arp_pkt)) { |
| 357 | dprintk("Packet is too small to be an ARP\n"); |
| 358 | goto out; |
| 359 | } |
| 360 | |
| 361 | if (arp->op_code == htons(ARPOP_REPLY)) { |
| 362 | /* update rx hash table for this ARP */ |
| 363 | rlb_update_entry_from_arp(bond, arp); |
| 364 | dprintk("Server received an ARP Reply from client\n"); |
| 365 | } |
| 366 | |
| 367 | res = NET_RX_SUCCESS; |
| 368 | |
| 369 | out: |
| 370 | dev_kfree_skb(skb); |
| 371 | |
| 372 | return res; |
| 373 | } |
| 374 | |
| 375 | /* Caller must hold bond lock for read */ |
| 376 | static struct slave *rlb_next_rx_slave(struct bonding *bond) |
| 377 | { |
| 378 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 379 | struct slave *rx_slave, *slave, *start_at; |
| 380 | int i = 0; |
| 381 | |
| 382 | if (bond_info->next_rx_slave) { |
| 383 | start_at = bond_info->next_rx_slave; |
| 384 | } else { |
| 385 | start_at = bond->first_slave; |
| 386 | } |
| 387 | |
| 388 | rx_slave = NULL; |
| 389 | |
| 390 | bond_for_each_slave_from(bond, slave, i, start_at) { |
| 391 | if (SLAVE_IS_OK(slave)) { |
| 392 | if (!rx_slave) { |
| 393 | rx_slave = slave; |
| 394 | } else if (slave->speed > rx_slave->speed) { |
| 395 | rx_slave = slave; |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | if (rx_slave) { |
| 401 | bond_info->next_rx_slave = rx_slave->next; |
| 402 | } |
| 403 | |
| 404 | return rx_slave; |
| 405 | } |
| 406 | |
| 407 | /* teach the switch the mac of a disabled slave |
| 408 | * on the primary for fault tolerance |
| 409 | * |
| 410 | * Caller must hold bond->curr_slave_lock for write or bond lock for write |
| 411 | */ |
| 412 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) |
| 413 | { |
| 414 | if (!bond->curr_active_slave) { |
| 415 | return; |
| 416 | } |
| 417 | |
| 418 | if (!bond->alb_info.primary_is_promisc) { |
| 419 | bond->alb_info.primary_is_promisc = 1; |
| 420 | dev_set_promiscuity(bond->curr_active_slave->dev, 1); |
| 421 | } |
| 422 | |
| 423 | bond->alb_info.rlb_promisc_timeout_counter = 0; |
| 424 | |
| 425 | alb_send_learning_packets(bond->curr_active_slave, addr); |
| 426 | } |
| 427 | |
| 428 | /* slave being removed should not be active at this point |
| 429 | * |
| 430 | * Caller must hold bond lock for read |
| 431 | */ |
| 432 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) |
| 433 | { |
| 434 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 435 | struct rlb_client_info *rx_hash_table; |
| 436 | u32 index, next_index; |
| 437 | |
| 438 | /* clear slave from rx_hashtbl */ |
| 439 | _lock_rx_hashtbl(bond); |
| 440 | |
| 441 | rx_hash_table = bond_info->rx_hashtbl; |
| 442 | index = bond_info->rx_hashtbl_head; |
| 443 | for (; index != RLB_NULL_INDEX; index = next_index) { |
| 444 | next_index = rx_hash_table[index].next; |
| 445 | if (rx_hash_table[index].slave == slave) { |
| 446 | struct slave *assigned_slave = rlb_next_rx_slave(bond); |
| 447 | |
| 448 | if (assigned_slave) { |
| 449 | rx_hash_table[index].slave = assigned_slave; |
| 450 | if (memcmp(rx_hash_table[index].mac_dst, |
| 451 | mac_bcast, ETH_ALEN)) { |
| 452 | bond_info->rx_hashtbl[index].ntt = 1; |
| 453 | bond_info->rx_ntt = 1; |
| 454 | /* A slave has been removed from the |
| 455 | * table because it is either disabled |
| 456 | * or being released. We must retry the |
| 457 | * update to avoid clients from not |
| 458 | * being updated & disconnecting when |
| 459 | * there is stress |
| 460 | */ |
| 461 | bond_info->rlb_update_retry_counter = |
| 462 | RLB_UPDATE_RETRY; |
| 463 | } |
| 464 | } else { /* there is no active slave */ |
| 465 | rx_hash_table[index].slave = NULL; |
| 466 | } |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | _unlock_rx_hashtbl(bond); |
| 471 | |
| 472 | write_lock(&bond->curr_slave_lock); |
| 473 | |
| 474 | if (slave != bond->curr_active_slave) { |
| 475 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); |
| 476 | } |
| 477 | |
| 478 | write_unlock(&bond->curr_slave_lock); |
| 479 | } |
| 480 | |
| 481 | static void rlb_update_client(struct rlb_client_info *client_info) |
| 482 | { |
| 483 | int i; |
| 484 | |
| 485 | if (!client_info->slave) { |
| 486 | return; |
| 487 | } |
| 488 | |
| 489 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { |
| 490 | struct sk_buff *skb; |
| 491 | |
| 492 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, |
| 493 | client_info->ip_dst, |
| 494 | client_info->slave->dev, |
| 495 | client_info->ip_src, |
| 496 | client_info->mac_dst, |
| 497 | client_info->slave->dev->dev_addr, |
| 498 | client_info->mac_dst); |
| 499 | if (!skb) { |
| 500 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 501 | ": %s: Error: failed to create an ARP packet\n", |
| 502 | client_info->slave->dev->master->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | continue; |
| 504 | } |
| 505 | |
| 506 | skb->dev = client_info->slave->dev; |
| 507 | |
| 508 | if (client_info->tag) { |
| 509 | skb = vlan_put_tag(skb, client_info->vlan_id); |
| 510 | if (!skb) { |
| 511 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 512 | ": %s: Error: failed to insert VLAN tag\n", |
| 513 | client_info->slave->dev->master->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | continue; |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | arp_xmit(skb); |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | /* sends ARP REPLIES that update the clients that need updating */ |
| 523 | static void rlb_update_rx_clients(struct bonding *bond) |
| 524 | { |
| 525 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 526 | struct rlb_client_info *client_info; |
| 527 | u32 hash_index; |
| 528 | |
| 529 | _lock_rx_hashtbl(bond); |
| 530 | |
| 531 | hash_index = bond_info->rx_hashtbl_head; |
| 532 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { |
| 533 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
| 534 | if (client_info->ntt) { |
| 535 | rlb_update_client(client_info); |
| 536 | if (bond_info->rlb_update_retry_counter == 0) { |
| 537 | client_info->ntt = 0; |
| 538 | } |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | /* do not update the entries again untill this counter is zero so that |
| 543 | * not to confuse the clients. |
| 544 | */ |
| 545 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; |
| 546 | |
| 547 | _unlock_rx_hashtbl(bond); |
| 548 | } |
| 549 | |
| 550 | /* The slave was assigned a new mac address - update the clients */ |
| 551 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) |
| 552 | { |
| 553 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 554 | struct rlb_client_info *client_info; |
| 555 | int ntt = 0; |
| 556 | u32 hash_index; |
| 557 | |
| 558 | _lock_rx_hashtbl(bond); |
| 559 | |
| 560 | hash_index = bond_info->rx_hashtbl_head; |
| 561 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { |
| 562 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
| 563 | |
| 564 | if ((client_info->slave == slave) && |
| 565 | memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) { |
| 566 | client_info->ntt = 1; |
| 567 | ntt = 1; |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | // update the team's flag only after the whole iteration |
| 572 | if (ntt) { |
| 573 | bond_info->rx_ntt = 1; |
| 574 | //fasten the change |
| 575 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
| 576 | } |
| 577 | |
| 578 | _unlock_rx_hashtbl(bond); |
| 579 | } |
| 580 | |
| 581 | /* mark all clients using src_ip to be updated */ |
| 582 | static void rlb_req_update_subnet_clients(struct bonding *bond, u32 src_ip) |
| 583 | { |
| 584 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 585 | struct rlb_client_info *client_info; |
| 586 | u32 hash_index; |
| 587 | |
| 588 | _lock_rx_hashtbl(bond); |
| 589 | |
| 590 | hash_index = bond_info->rx_hashtbl_head; |
| 591 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { |
| 592 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
| 593 | |
| 594 | if (!client_info->slave) { |
| 595 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 596 | ": %s: Error: found a client with no channel in " |
| 597 | "the client's hash table\n", |
| 598 | bond->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | continue; |
| 600 | } |
| 601 | /*update all clients using this src_ip, that are not assigned |
| 602 | * to the team's address (curr_active_slave) and have a known |
| 603 | * unicast mac address. |
| 604 | */ |
| 605 | if ((client_info->ip_src == src_ip) && |
| 606 | memcmp(client_info->slave->dev->dev_addr, |
| 607 | bond->dev->dev_addr, ETH_ALEN) && |
| 608 | memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) { |
| 609 | client_info->ntt = 1; |
| 610 | bond_info->rx_ntt = 1; |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | _unlock_rx_hashtbl(bond); |
| 615 | } |
| 616 | |
| 617 | /* Caller must hold both bond and ptr locks for read */ |
| 618 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) |
| 619 | { |
| 620 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
Arnaldo Carvalho de Melo | a16aeb3 | 2007-03-10 16:07:19 -0300 | [diff] [blame] | 621 | struct arp_pkt *arp = arp_pkt(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | struct slave *assigned_slave; |
| 623 | struct rlb_client_info *client_info; |
| 624 | u32 hash_index = 0; |
| 625 | |
| 626 | _lock_rx_hashtbl(bond); |
| 627 | |
| 628 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src)); |
| 629 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
| 630 | |
| 631 | if (client_info->assigned) { |
| 632 | if ((client_info->ip_src == arp->ip_src) && |
| 633 | (client_info->ip_dst == arp->ip_dst)) { |
| 634 | /* the entry is already assigned to this client */ |
| 635 | if (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) { |
| 636 | /* update mac address from arp */ |
| 637 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); |
| 638 | } |
| 639 | |
| 640 | assigned_slave = client_info->slave; |
| 641 | if (assigned_slave) { |
| 642 | _unlock_rx_hashtbl(bond); |
| 643 | return assigned_slave; |
| 644 | } |
| 645 | } else { |
| 646 | /* the entry is already assigned to some other client, |
| 647 | * move the old client to primary (curr_active_slave) so |
| 648 | * that the new client can be assigned to this entry. |
| 649 | */ |
| 650 | if (bond->curr_active_slave && |
| 651 | client_info->slave != bond->curr_active_slave) { |
| 652 | client_info->slave = bond->curr_active_slave; |
| 653 | rlb_update_client(client_info); |
| 654 | } |
| 655 | } |
| 656 | } |
| 657 | /* assign a new slave */ |
| 658 | assigned_slave = rlb_next_rx_slave(bond); |
| 659 | |
| 660 | if (assigned_slave) { |
| 661 | client_info->ip_src = arp->ip_src; |
| 662 | client_info->ip_dst = arp->ip_dst; |
| 663 | /* arp->mac_dst is broadcast for arp reqeusts. |
| 664 | * will be updated with clients actual unicast mac address |
| 665 | * upon receiving an arp reply. |
| 666 | */ |
| 667 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); |
| 668 | client_info->slave = assigned_slave; |
| 669 | |
| 670 | if (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) { |
| 671 | client_info->ntt = 1; |
| 672 | bond->alb_info.rx_ntt = 1; |
| 673 | } else { |
| 674 | client_info->ntt = 0; |
| 675 | } |
| 676 | |
| 677 | if (!list_empty(&bond->vlan_list)) { |
| 678 | unsigned short vlan_id; |
| 679 | int res = vlan_get_tag(skb, &vlan_id); |
| 680 | if (!res) { |
| 681 | client_info->tag = 1; |
| 682 | client_info->vlan_id = vlan_id; |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | if (!client_info->assigned) { |
| 687 | u32 prev_tbl_head = bond_info->rx_hashtbl_head; |
| 688 | bond_info->rx_hashtbl_head = hash_index; |
| 689 | client_info->next = prev_tbl_head; |
| 690 | if (prev_tbl_head != RLB_NULL_INDEX) { |
| 691 | bond_info->rx_hashtbl[prev_tbl_head].prev = |
| 692 | hash_index; |
| 693 | } |
| 694 | client_info->assigned = 1; |
| 695 | } |
| 696 | } |
| 697 | |
| 698 | _unlock_rx_hashtbl(bond); |
| 699 | |
| 700 | return assigned_slave; |
| 701 | } |
| 702 | |
| 703 | /* chooses (and returns) transmit channel for arp reply |
| 704 | * does not choose channel for other arp types since they are |
| 705 | * sent on the curr_active_slave |
| 706 | */ |
| 707 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) |
| 708 | { |
Arnaldo Carvalho de Melo | a16aeb3 | 2007-03-10 16:07:19 -0300 | [diff] [blame] | 709 | struct arp_pkt *arp = arp_pkt(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | struct slave *tx_slave = NULL; |
| 711 | |
| 712 | if (arp->op_code == __constant_htons(ARPOP_REPLY)) { |
| 713 | /* the arp must be sent on the selected |
| 714 | * rx channel |
| 715 | */ |
| 716 | tx_slave = rlb_choose_channel(skb, bond); |
| 717 | if (tx_slave) { |
| 718 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); |
| 719 | } |
| 720 | dprintk("Server sent ARP Reply packet\n"); |
| 721 | } else if (arp->op_code == __constant_htons(ARPOP_REQUEST)) { |
| 722 | /* Create an entry in the rx_hashtbl for this client as a |
| 723 | * place holder. |
| 724 | * When the arp reply is received the entry will be updated |
| 725 | * with the correct unicast address of the client. |
| 726 | */ |
| 727 | rlb_choose_channel(skb, bond); |
| 728 | |
| 729 | /* The ARP relpy packets must be delayed so that |
| 730 | * they can cancel out the influence of the ARP request. |
| 731 | */ |
| 732 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; |
| 733 | |
| 734 | /* arp requests are broadcast and are sent on the primary |
| 735 | * the arp request will collapse all clients on the subnet to |
| 736 | * the primary slave. We must register these clients to be |
| 737 | * updated with their assigned mac. |
| 738 | */ |
| 739 | rlb_req_update_subnet_clients(bond, arp->ip_src); |
| 740 | dprintk("Server sent ARP Request packet\n"); |
| 741 | } |
| 742 | |
| 743 | return tx_slave; |
| 744 | } |
| 745 | |
| 746 | /* Caller must hold bond lock for read */ |
| 747 | static void rlb_rebalance(struct bonding *bond) |
| 748 | { |
| 749 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 750 | struct slave *assigned_slave; |
| 751 | struct rlb_client_info *client_info; |
| 752 | int ntt; |
| 753 | u32 hash_index; |
| 754 | |
| 755 | _lock_rx_hashtbl(bond); |
| 756 | |
| 757 | ntt = 0; |
| 758 | hash_index = bond_info->rx_hashtbl_head; |
| 759 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { |
| 760 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
| 761 | assigned_slave = rlb_next_rx_slave(bond); |
| 762 | if (assigned_slave && (client_info->slave != assigned_slave)) { |
| 763 | client_info->slave = assigned_slave; |
| 764 | client_info->ntt = 1; |
| 765 | ntt = 1; |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | /* update the team's flag only after the whole iteration */ |
| 770 | if (ntt) { |
| 771 | bond_info->rx_ntt = 1; |
| 772 | } |
| 773 | _unlock_rx_hashtbl(bond); |
| 774 | } |
| 775 | |
| 776 | /* Caller must hold rx_hashtbl lock */ |
| 777 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
| 778 | { |
| 779 | memset(entry, 0, sizeof(struct rlb_client_info)); |
| 780 | entry->next = RLB_NULL_INDEX; |
| 781 | entry->prev = RLB_NULL_INDEX; |
| 782 | } |
| 783 | |
| 784 | static int rlb_initialize(struct bonding *bond) |
| 785 | { |
| 786 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 787 | struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type); |
Mitch Williams | 0d206a3 | 2005-11-09 10:35:30 -0800 | [diff] [blame] | 788 | struct rlb_client_info *new_hashtbl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
| 790 | int i; |
| 791 | |
| 792 | spin_lock_init(&(bond_info->rx_hashtbl_lock)); |
| 793 | |
Mitch Williams | 0d206a3 | 2005-11-09 10:35:30 -0800 | [diff] [blame] | 794 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
| 795 | if (!new_hashtbl) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 797 | ": %s: Error: Failed to allocate RLB hash table\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | bond->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | return -1; |
| 800 | } |
Mitch Williams | 0d206a3 | 2005-11-09 10:35:30 -0800 | [diff] [blame] | 801 | _lock_rx_hashtbl(bond); |
| 802 | |
| 803 | bond_info->rx_hashtbl = new_hashtbl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
| 805 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; |
| 806 | |
| 807 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { |
| 808 | rlb_init_table_entry(bond_info->rx_hashtbl + i); |
| 809 | } |
| 810 | |
| 811 | _unlock_rx_hashtbl(bond); |
| 812 | |
| 813 | /*initialize packet type*/ |
| 814 | pk_type->type = __constant_htons(ETH_P_ARP); |
| 815 | pk_type->dev = bond->dev; |
| 816 | pk_type->func = rlb_arp_recv; |
| 817 | |
| 818 | /* register to receive ARPs */ |
| 819 | dev_add_pack(pk_type); |
| 820 | |
| 821 | return 0; |
| 822 | } |
| 823 | |
| 824 | static void rlb_deinitialize(struct bonding *bond) |
| 825 | { |
| 826 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 827 | |
| 828 | dev_remove_pack(&(bond_info->rlb_pkt_type)); |
| 829 | |
| 830 | _lock_rx_hashtbl(bond); |
| 831 | |
| 832 | kfree(bond_info->rx_hashtbl); |
| 833 | bond_info->rx_hashtbl = NULL; |
| 834 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; |
| 835 | |
| 836 | _unlock_rx_hashtbl(bond); |
| 837 | } |
| 838 | |
| 839 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) |
| 840 | { |
| 841 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 842 | u32 curr_index; |
| 843 | |
| 844 | _lock_rx_hashtbl(bond); |
| 845 | |
| 846 | curr_index = bond_info->rx_hashtbl_head; |
| 847 | while (curr_index != RLB_NULL_INDEX) { |
| 848 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); |
| 849 | u32 next_index = bond_info->rx_hashtbl[curr_index].next; |
| 850 | u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; |
| 851 | |
| 852 | if (curr->tag && (curr->vlan_id == vlan_id)) { |
| 853 | if (curr_index == bond_info->rx_hashtbl_head) { |
| 854 | bond_info->rx_hashtbl_head = next_index; |
| 855 | } |
| 856 | if (prev_index != RLB_NULL_INDEX) { |
| 857 | bond_info->rx_hashtbl[prev_index].next = next_index; |
| 858 | } |
| 859 | if (next_index != RLB_NULL_INDEX) { |
| 860 | bond_info->rx_hashtbl[next_index].prev = prev_index; |
| 861 | } |
| 862 | |
| 863 | rlb_init_table_entry(curr); |
| 864 | } |
| 865 | |
| 866 | curr_index = next_index; |
| 867 | } |
| 868 | |
| 869 | _unlock_rx_hashtbl(bond); |
| 870 | } |
| 871 | |
| 872 | /*********************** tlb/rlb shared functions *********************/ |
| 873 | |
| 874 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) |
| 875 | { |
| 876 | struct bonding *bond = bond_get_bond_by_slave(slave); |
| 877 | struct learning_pkt pkt; |
| 878 | int size = sizeof(struct learning_pkt); |
| 879 | int i; |
| 880 | |
| 881 | memset(&pkt, 0, size); |
| 882 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); |
| 883 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); |
| 884 | pkt.type = __constant_htons(ETH_P_LOOP); |
| 885 | |
| 886 | for (i = 0; i < MAX_LP_BURST; i++) { |
| 887 | struct sk_buff *skb; |
| 888 | char *data; |
| 889 | |
| 890 | skb = dev_alloc_skb(size); |
| 891 | if (!skb) { |
| 892 | return; |
| 893 | } |
| 894 | |
| 895 | data = skb_put(skb, size); |
| 896 | memcpy(data, &pkt, size); |
| 897 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 898 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | e7dd65d | 2007-03-10 20:09:45 -0300 | [diff] [blame] | 899 | skb->nh.raw = skb->mac.raw + ETH_HLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | skb->protocol = pkt.type; |
| 901 | skb->priority = TC_PRIO_CONTROL; |
| 902 | skb->dev = slave->dev; |
| 903 | |
| 904 | if (!list_empty(&bond->vlan_list)) { |
| 905 | struct vlan_entry *vlan; |
| 906 | |
| 907 | vlan = bond_next_vlan(bond, |
| 908 | bond->alb_info.current_alb_vlan); |
| 909 | |
| 910 | bond->alb_info.current_alb_vlan = vlan; |
| 911 | if (!vlan) { |
| 912 | kfree_skb(skb); |
| 913 | continue; |
| 914 | } |
| 915 | |
| 916 | skb = vlan_put_tag(skb, vlan->vlan_id); |
| 917 | if (!skb) { |
| 918 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 919 | ": %s: Error: failed to insert VLAN tag\n", |
| 920 | bond->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | continue; |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | dev_queue_xmit(skb); |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | /* hw is a boolean parameter that determines whether we should try and |
| 930 | * set the hw address of the device as well as the hw address of the |
| 931 | * net_device |
| 932 | */ |
| 933 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw) |
| 934 | { |
| 935 | struct net_device *dev = slave->dev; |
| 936 | struct sockaddr s_addr; |
| 937 | |
| 938 | if (!hw) { |
| 939 | memcpy(dev->dev_addr, addr, dev->addr_len); |
| 940 | return 0; |
| 941 | } |
| 942 | |
| 943 | /* for rlb each slave must have a unique hw mac addresses so that */ |
| 944 | /* each slave will receive packets destined to a different mac */ |
| 945 | memcpy(s_addr.sa_data, addr, dev->addr_len); |
| 946 | s_addr.sa_family = dev->type; |
| 947 | if (dev_set_mac_address(dev, &s_addr)) { |
| 948 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 949 | ": %s: Error: dev_set_mac_address of dev %s failed! ALB " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | "mode requires that the base driver support setting " |
| 951 | "the hw address also when the network device's " |
| 952 | "interface is open\n", |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 953 | dev->master->name, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | return -EOPNOTSUPP; |
| 955 | } |
| 956 | return 0; |
| 957 | } |
| 958 | |
| 959 | /* Caller must hold bond lock for write or curr_slave_lock for write*/ |
| 960 | static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2) |
| 961 | { |
| 962 | struct slave *disabled_slave = NULL; |
| 963 | u8 tmp_mac_addr[ETH_ALEN]; |
| 964 | int slaves_state_differ; |
| 965 | |
| 966 | slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); |
| 967 | |
| 968 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); |
| 969 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled); |
| 970 | alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled); |
| 971 | |
| 972 | /* fasten the change in the switch */ |
| 973 | if (SLAVE_IS_OK(slave1)) { |
| 974 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); |
| 975 | if (bond->alb_info.rlb_enabled) { |
| 976 | /* inform the clients that the mac address |
| 977 | * has changed |
| 978 | */ |
| 979 | rlb_req_update_slave_clients(bond, slave1); |
| 980 | } |
| 981 | } else { |
| 982 | disabled_slave = slave1; |
| 983 | } |
| 984 | |
| 985 | if (SLAVE_IS_OK(slave2)) { |
| 986 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); |
| 987 | if (bond->alb_info.rlb_enabled) { |
| 988 | /* inform the clients that the mac address |
| 989 | * has changed |
| 990 | */ |
| 991 | rlb_req_update_slave_clients(bond, slave2); |
| 992 | } |
| 993 | } else { |
| 994 | disabled_slave = slave2; |
| 995 | } |
| 996 | |
| 997 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { |
| 998 | /* A disabled slave was assigned an active mac addr */ |
| 999 | rlb_teach_disabled_mac_on_primary(bond, |
| 1000 | disabled_slave->dev->dev_addr); |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | /** |
| 1005 | * alb_change_hw_addr_on_detach |
| 1006 | * @bond: bonding we're working on |
| 1007 | * @slave: the slave that was just detached |
| 1008 | * |
| 1009 | * We assume that @slave was already detached from the slave list. |
| 1010 | * |
| 1011 | * If @slave's permanent hw address is different both from its current |
| 1012 | * address and from @bond's address, then somewhere in the bond there's |
| 1013 | * a slave that has @slave's permanet address as its current address. |
| 1014 | * We'll make sure that that slave no longer uses @slave's permanent address. |
| 1015 | * |
| 1016 | * Caller must hold bond lock |
| 1017 | */ |
| 1018 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) |
| 1019 | { |
| 1020 | int perm_curr_diff; |
| 1021 | int perm_bond_diff; |
| 1022 | |
| 1023 | perm_curr_diff = memcmp(slave->perm_hwaddr, |
| 1024 | slave->dev->dev_addr, |
| 1025 | ETH_ALEN); |
| 1026 | perm_bond_diff = memcmp(slave->perm_hwaddr, |
| 1027 | bond->dev->dev_addr, |
| 1028 | ETH_ALEN); |
| 1029 | |
| 1030 | if (perm_curr_diff && perm_bond_diff) { |
| 1031 | struct slave *tmp_slave; |
| 1032 | int i, found = 0; |
| 1033 | |
| 1034 | bond_for_each_slave(bond, tmp_slave, i) { |
| 1035 | if (!memcmp(slave->perm_hwaddr, |
| 1036 | tmp_slave->dev->dev_addr, |
| 1037 | ETH_ALEN)) { |
| 1038 | found = 1; |
| 1039 | break; |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | if (found) { |
| 1044 | alb_swap_mac_addr(bond, slave, tmp_slave); |
| 1045 | } |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | /** |
| 1050 | * alb_handle_addr_collision_on_attach |
| 1051 | * @bond: bonding we're working on |
| 1052 | * @slave: the slave that was just attached |
| 1053 | * |
| 1054 | * checks uniqueness of slave's mac address and handles the case the |
| 1055 | * new slave uses the bonds mac address. |
| 1056 | * |
| 1057 | * If the permanent hw address of @slave is @bond's hw address, we need to |
| 1058 | * find a different hw address to give @slave, that isn't in use by any other |
| 1059 | * slave in the bond. This address must be, of course, one of the premanent |
| 1060 | * addresses of the other slaves. |
| 1061 | * |
| 1062 | * We go over the slave list, and for each slave there we compare its |
| 1063 | * permanent hw address with the current address of all the other slaves. |
| 1064 | * If no match was found, then we've found a slave with a permanent address |
| 1065 | * that isn't used by any other slave in the bond, so we can assign it to |
| 1066 | * @slave. |
| 1067 | * |
| 1068 | * assumption: this function is called before @slave is attached to the |
| 1069 | * bond slave list. |
| 1070 | * |
| 1071 | * caller must hold the bond lock for write since the mac addresses are compared |
| 1072 | * and may be swapped. |
| 1073 | */ |
| 1074 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) |
| 1075 | { |
| 1076 | struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; |
| 1077 | struct slave *has_bond_addr = bond->curr_active_slave; |
| 1078 | int i, j, found = 0; |
| 1079 | |
| 1080 | if (bond->slave_cnt == 0) { |
| 1081 | /* this is the first slave */ |
| 1082 | return 0; |
| 1083 | } |
| 1084 | |
| 1085 | /* if slave's mac address differs from bond's mac address |
| 1086 | * check uniqueness of slave's mac address against the other |
| 1087 | * slaves in the bond. |
| 1088 | */ |
| 1089 | if (memcmp(slave->perm_hwaddr, bond->dev->dev_addr, ETH_ALEN)) { |
| 1090 | bond_for_each_slave(bond, tmp_slave1, i) { |
| 1091 | if (!memcmp(tmp_slave1->dev->dev_addr, slave->dev->dev_addr, |
| 1092 | ETH_ALEN)) { |
| 1093 | found = 1; |
| 1094 | break; |
| 1095 | } |
| 1096 | } |
| 1097 | |
John W. Linville | 6b38aef | 2005-07-28 15:00:15 -0400 | [diff] [blame] | 1098 | if (!found) |
| 1099 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
John W. Linville | 6b38aef | 2005-07-28 15:00:15 -0400 | [diff] [blame] | 1101 | /* Try setting slave mac to bond address and fall-through |
| 1102 | to code handling that situation below... */ |
| 1103 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr, |
| 1104 | bond->alb_info.rlb_enabled); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | } |
| 1106 | |
| 1107 | /* The slave's address is equal to the address of the bond. |
| 1108 | * Search for a spare address in the bond for this slave. |
| 1109 | */ |
| 1110 | free_mac_slave = NULL; |
| 1111 | |
| 1112 | bond_for_each_slave(bond, tmp_slave1, i) { |
| 1113 | found = 0; |
| 1114 | bond_for_each_slave(bond, tmp_slave2, j) { |
| 1115 | if (!memcmp(tmp_slave1->perm_hwaddr, |
| 1116 | tmp_slave2->dev->dev_addr, |
| 1117 | ETH_ALEN)) { |
| 1118 | found = 1; |
| 1119 | break; |
| 1120 | } |
| 1121 | } |
| 1122 | |
| 1123 | if (!found) { |
| 1124 | /* no slave has tmp_slave1's perm addr |
| 1125 | * as its curr addr |
| 1126 | */ |
| 1127 | free_mac_slave = tmp_slave1; |
| 1128 | break; |
| 1129 | } |
| 1130 | |
| 1131 | if (!has_bond_addr) { |
| 1132 | if (!memcmp(tmp_slave1->dev->dev_addr, |
| 1133 | bond->dev->dev_addr, |
| 1134 | ETH_ALEN)) { |
| 1135 | |
| 1136 | has_bond_addr = tmp_slave1; |
| 1137 | } |
| 1138 | } |
| 1139 | } |
| 1140 | |
| 1141 | if (free_mac_slave) { |
| 1142 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, |
| 1143 | bond->alb_info.rlb_enabled); |
| 1144 | |
| 1145 | printk(KERN_WARNING DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 1146 | ": %s: Warning: the hw address of slave %s is in use by " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | "the bond; giving it the hw address of %s\n", |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 1148 | bond->dev->name, slave->dev->name, free_mac_slave->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | |
| 1150 | } else if (has_bond_addr) { |
| 1151 | printk(KERN_ERR DRV_NAME |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 1152 | ": %s: Error: the hw address of slave %s is in use by the " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | "bond; couldn't find a slave with a free hw address to " |
| 1154 | "give it (this should not have happened)\n", |
Mitch Williams | 4e0952c | 2005-11-09 10:34:57 -0800 | [diff] [blame] | 1155 | bond->dev->name, slave->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | return -EFAULT; |
| 1157 | } |
| 1158 | |
| 1159 | return 0; |
| 1160 | } |
| 1161 | |
| 1162 | /** |
| 1163 | * alb_set_mac_address |
| 1164 | * @bond: |
| 1165 | * @addr: |
| 1166 | * |
| 1167 | * In TLB mode all slaves are configured to the bond's hw address, but set |
| 1168 | * their dev_addr field to different addresses (based on their permanent hw |
| 1169 | * addresses). |
| 1170 | * |
| 1171 | * For each slave, this function sets the interface to the new address and then |
| 1172 | * changes its dev_addr field to its previous value. |
| 1173 | * |
| 1174 | * Unwinding assumes bond's mac address has not yet changed. |
| 1175 | */ |
| 1176 | static int alb_set_mac_address(struct bonding *bond, void *addr) |
| 1177 | { |
| 1178 | struct sockaddr sa; |
| 1179 | struct slave *slave, *stop_at; |
| 1180 | char tmp_addr[ETH_ALEN]; |
| 1181 | int res; |
| 1182 | int i; |
| 1183 | |
| 1184 | if (bond->alb_info.rlb_enabled) { |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
| 1188 | bond_for_each_slave(bond, slave, i) { |
| 1189 | if (slave->dev->set_mac_address == NULL) { |
| 1190 | res = -EOPNOTSUPP; |
| 1191 | goto unwind; |
| 1192 | } |
| 1193 | |
| 1194 | /* save net_device's current hw address */ |
| 1195 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); |
| 1196 | |
| 1197 | res = dev_set_mac_address(slave->dev, addr); |
| 1198 | |
| 1199 | /* restore net_device's hw address */ |
| 1200 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); |
| 1201 | |
| 1202 | if (res) { |
| 1203 | goto unwind; |
| 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | return 0; |
| 1208 | |
| 1209 | unwind: |
| 1210 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); |
| 1211 | sa.sa_family = bond->dev->type; |
| 1212 | |
| 1213 | /* unwind from head to the slave that failed */ |
| 1214 | stop_at = slave; |
| 1215 | bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { |
| 1216 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); |
| 1217 | dev_set_mac_address(slave->dev, &sa); |
| 1218 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); |
| 1219 | } |
| 1220 | |
| 1221 | return res; |
| 1222 | } |
| 1223 | |
| 1224 | /************************ exported alb funcions ************************/ |
| 1225 | |
| 1226 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) |
| 1227 | { |
| 1228 | int res; |
| 1229 | |
| 1230 | res = tlb_initialize(bond); |
| 1231 | if (res) { |
| 1232 | return res; |
| 1233 | } |
| 1234 | |
| 1235 | if (rlb_enabled) { |
| 1236 | bond->alb_info.rlb_enabled = 1; |
| 1237 | /* initialize rlb */ |
| 1238 | res = rlb_initialize(bond); |
| 1239 | if (res) { |
| 1240 | tlb_deinitialize(bond); |
| 1241 | return res; |
| 1242 | } |
Mitch Williams | b76850a | 2005-11-09 10:35:35 -0800 | [diff] [blame] | 1243 | } else { |
| 1244 | bond->alb_info.rlb_enabled = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | } |
| 1246 | |
| 1247 | return 0; |
| 1248 | } |
| 1249 | |
| 1250 | void bond_alb_deinitialize(struct bonding *bond) |
| 1251 | { |
| 1252 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 1253 | |
| 1254 | tlb_deinitialize(bond); |
| 1255 | |
| 1256 | if (bond_info->rlb_enabled) { |
| 1257 | rlb_deinitialize(bond); |
| 1258 | } |
| 1259 | } |
| 1260 | |
| 1261 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
| 1262 | { |
| 1263 | struct bonding *bond = bond_dev->priv; |
| 1264 | struct ethhdr *eth_data; |
| 1265 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 1266 | struct slave *tx_slave = NULL; |
Arjan van de Ven | f71e130 | 2006-03-03 21:33:57 -0500 | [diff] [blame] | 1267 | static const u32 ip_bcast = 0xffffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | int hash_size = 0; |
| 1269 | int do_tx_balance = 1; |
| 1270 | u32 hash_index = 0; |
| 1271 | u8 *hash_start = NULL; |
| 1272 | int res = 1; |
| 1273 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1274 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | eth_data = eth_hdr(skb); |
| 1276 | |
| 1277 | /* make sure that the curr_active_slave and the slaves list do |
| 1278 | * not change during tx |
| 1279 | */ |
| 1280 | read_lock(&bond->lock); |
| 1281 | read_lock(&bond->curr_slave_lock); |
| 1282 | |
| 1283 | if (!BOND_IS_OK(bond)) { |
| 1284 | goto out; |
| 1285 | } |
| 1286 | |
| 1287 | switch (ntohs(skb->protocol)) { |
| 1288 | case ETH_P_IP: |
| 1289 | if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) || |
| 1290 | (skb->nh.iph->daddr == ip_bcast) || |
| 1291 | (skb->nh.iph->protocol == IPPROTO_IGMP)) { |
| 1292 | do_tx_balance = 0; |
| 1293 | break; |
| 1294 | } |
| 1295 | hash_start = (char*)&(skb->nh.iph->daddr); |
| 1296 | hash_size = sizeof(skb->nh.iph->daddr); |
| 1297 | break; |
| 1298 | case ETH_P_IPV6: |
| 1299 | if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) { |
| 1300 | do_tx_balance = 0; |
| 1301 | break; |
| 1302 | } |
| 1303 | |
| 1304 | hash_start = (char*)&(skb->nh.ipv6h->daddr); |
| 1305 | hash_size = sizeof(skb->nh.ipv6h->daddr); |
| 1306 | break; |
| 1307 | case ETH_P_IPX: |
| 1308 | if (ipx_hdr(skb)->ipx_checksum != |
| 1309 | __constant_htons(IPX_NO_CHECKSUM)) { |
| 1310 | /* something is wrong with this packet */ |
| 1311 | do_tx_balance = 0; |
| 1312 | break; |
| 1313 | } |
| 1314 | |
| 1315 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { |
| 1316 | /* The only protocol worth balancing in |
| 1317 | * this family since it has an "ARP" like |
| 1318 | * mechanism |
| 1319 | */ |
| 1320 | do_tx_balance = 0; |
| 1321 | break; |
| 1322 | } |
| 1323 | |
| 1324 | hash_start = (char*)eth_data->h_dest; |
| 1325 | hash_size = ETH_ALEN; |
| 1326 | break; |
| 1327 | case ETH_P_ARP: |
| 1328 | do_tx_balance = 0; |
| 1329 | if (bond_info->rlb_enabled) { |
| 1330 | tx_slave = rlb_arp_xmit(skb, bond); |
| 1331 | } |
| 1332 | break; |
| 1333 | default: |
| 1334 | do_tx_balance = 0; |
| 1335 | break; |
| 1336 | } |
| 1337 | |
| 1338 | if (do_tx_balance) { |
| 1339 | hash_index = _simple_hash(hash_start, hash_size); |
| 1340 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); |
| 1341 | } |
| 1342 | |
| 1343 | if (!tx_slave) { |
| 1344 | /* unbalanced or unassigned, send through primary */ |
| 1345 | tx_slave = bond->curr_active_slave; |
| 1346 | bond_info->unbalanced_load += skb->len; |
| 1347 | } |
| 1348 | |
| 1349 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { |
| 1350 | if (tx_slave != bond->curr_active_slave) { |
| 1351 | memcpy(eth_data->h_source, |
| 1352 | tx_slave->dev->dev_addr, |
| 1353 | ETH_ALEN); |
| 1354 | } |
| 1355 | |
| 1356 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); |
| 1357 | } else { |
| 1358 | if (tx_slave) { |
| 1359 | tlb_clear_slave(bond, tx_slave, 0); |
| 1360 | } |
| 1361 | } |
| 1362 | |
| 1363 | out: |
| 1364 | if (res) { |
| 1365 | /* no suitable interface, frame not sent */ |
| 1366 | dev_kfree_skb(skb); |
| 1367 | } |
| 1368 | read_unlock(&bond->curr_slave_lock); |
| 1369 | read_unlock(&bond->lock); |
| 1370 | return 0; |
| 1371 | } |
| 1372 | |
| 1373 | void bond_alb_monitor(struct bonding *bond) |
| 1374 | { |
| 1375 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 1376 | struct slave *slave; |
| 1377 | int i; |
| 1378 | |
| 1379 | read_lock(&bond->lock); |
| 1380 | |
| 1381 | if (bond->kill_timers) { |
| 1382 | goto out; |
| 1383 | } |
| 1384 | |
| 1385 | if (bond->slave_cnt == 0) { |
| 1386 | bond_info->tx_rebalance_counter = 0; |
| 1387 | bond_info->lp_counter = 0; |
| 1388 | goto re_arm; |
| 1389 | } |
| 1390 | |
| 1391 | bond_info->tx_rebalance_counter++; |
| 1392 | bond_info->lp_counter++; |
| 1393 | |
| 1394 | /* send learning packets */ |
| 1395 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) { |
| 1396 | /* change of curr_active_slave involves swapping of mac addresses. |
| 1397 | * in order to avoid this swapping from happening while |
| 1398 | * sending the learning packets, the curr_slave_lock must be held for |
| 1399 | * read. |
| 1400 | */ |
| 1401 | read_lock(&bond->curr_slave_lock); |
| 1402 | |
| 1403 | bond_for_each_slave(bond, slave, i) { |
Mitch Williams | e944ef7 | 2005-11-09 10:36:50 -0800 | [diff] [blame] | 1404 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | |
| 1407 | read_unlock(&bond->curr_slave_lock); |
| 1408 | |
| 1409 | bond_info->lp_counter = 0; |
| 1410 | } |
| 1411 | |
| 1412 | /* rebalance tx traffic */ |
| 1413 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { |
| 1414 | |
| 1415 | read_lock(&bond->curr_slave_lock); |
| 1416 | |
| 1417 | bond_for_each_slave(bond, slave, i) { |
| 1418 | tlb_clear_slave(bond, slave, 1); |
| 1419 | if (slave == bond->curr_active_slave) { |
| 1420 | SLAVE_TLB_INFO(slave).load = |
| 1421 | bond_info->unbalanced_load / |
| 1422 | BOND_TLB_REBALANCE_INTERVAL; |
| 1423 | bond_info->unbalanced_load = 0; |
| 1424 | } |
| 1425 | } |
| 1426 | |
| 1427 | read_unlock(&bond->curr_slave_lock); |
| 1428 | |
| 1429 | bond_info->tx_rebalance_counter = 0; |
| 1430 | } |
| 1431 | |
| 1432 | /* handle rlb stuff */ |
| 1433 | if (bond_info->rlb_enabled) { |
| 1434 | /* the following code changes the promiscuity of the |
| 1435 | * the curr_active_slave. It needs to be locked with a |
| 1436 | * write lock to protect from other code that also |
| 1437 | * sets the promiscuity. |
| 1438 | */ |
Karsten Keil | 39984a9 | 2006-09-29 23:28:42 -0700 | [diff] [blame] | 1439 | write_lock_bh(&bond->curr_slave_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | if (bond_info->primary_is_promisc && |
| 1442 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { |
| 1443 | |
| 1444 | bond_info->rlb_promisc_timeout_counter = 0; |
| 1445 | |
| 1446 | /* If the primary was set to promiscuous mode |
| 1447 | * because a slave was disabled then |
| 1448 | * it can now leave promiscuous mode. |
| 1449 | */ |
| 1450 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); |
| 1451 | bond_info->primary_is_promisc = 0; |
| 1452 | } |
| 1453 | |
Karsten Keil | 39984a9 | 2006-09-29 23:28:42 -0700 | [diff] [blame] | 1454 | write_unlock_bh(&bond->curr_slave_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
| 1456 | if (bond_info->rlb_rebalance) { |
| 1457 | bond_info->rlb_rebalance = 0; |
| 1458 | rlb_rebalance(bond); |
| 1459 | } |
| 1460 | |
| 1461 | /* check if clients need updating */ |
| 1462 | if (bond_info->rx_ntt) { |
| 1463 | if (bond_info->rlb_update_delay_counter) { |
| 1464 | --bond_info->rlb_update_delay_counter; |
| 1465 | } else { |
| 1466 | rlb_update_rx_clients(bond); |
| 1467 | if (bond_info->rlb_update_retry_counter) { |
| 1468 | --bond_info->rlb_update_retry_counter; |
| 1469 | } else { |
| 1470 | bond_info->rx_ntt = 0; |
| 1471 | } |
| 1472 | } |
| 1473 | } |
| 1474 | } |
| 1475 | |
| 1476 | re_arm: |
| 1477 | mod_timer(&(bond_info->alb_timer), jiffies + alb_delta_in_ticks); |
| 1478 | out: |
| 1479 | read_unlock(&bond->lock); |
| 1480 | } |
| 1481 | |
| 1482 | /* assumption: called before the slave is attached to the bond |
| 1483 | * and not locked by the bond lock |
| 1484 | */ |
| 1485 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) |
| 1486 | { |
| 1487 | int res; |
| 1488 | |
| 1489 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, |
| 1490 | bond->alb_info.rlb_enabled); |
| 1491 | if (res) { |
| 1492 | return res; |
| 1493 | } |
| 1494 | |
| 1495 | /* caller must hold the bond lock for write since the mac addresses |
| 1496 | * are compared and may be swapped. |
| 1497 | */ |
| 1498 | write_lock_bh(&bond->lock); |
| 1499 | |
| 1500 | res = alb_handle_addr_collision_on_attach(bond, slave); |
| 1501 | |
| 1502 | write_unlock_bh(&bond->lock); |
| 1503 | |
| 1504 | if (res) { |
| 1505 | return res; |
| 1506 | } |
| 1507 | |
| 1508 | tlb_init_slave(slave); |
| 1509 | |
| 1510 | /* order a rebalance ASAP */ |
| 1511 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; |
| 1512 | |
| 1513 | if (bond->alb_info.rlb_enabled) { |
| 1514 | bond->alb_info.rlb_rebalance = 1; |
| 1515 | } |
| 1516 | |
| 1517 | return 0; |
| 1518 | } |
| 1519 | |
| 1520 | /* Caller must hold bond lock for write */ |
| 1521 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
| 1522 | { |
| 1523 | if (bond->slave_cnt > 1) { |
| 1524 | alb_change_hw_addr_on_detach(bond, slave); |
| 1525 | } |
| 1526 | |
| 1527 | tlb_clear_slave(bond, slave, 0); |
| 1528 | |
| 1529 | if (bond->alb_info.rlb_enabled) { |
| 1530 | bond->alb_info.next_rx_slave = NULL; |
| 1531 | rlb_clear_slave(bond, slave); |
| 1532 | } |
| 1533 | } |
| 1534 | |
| 1535 | /* Caller must hold bond lock for read */ |
| 1536 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) |
| 1537 | { |
| 1538 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
| 1539 | |
| 1540 | if (link == BOND_LINK_DOWN) { |
| 1541 | tlb_clear_slave(bond, slave, 0); |
| 1542 | if (bond->alb_info.rlb_enabled) { |
| 1543 | rlb_clear_slave(bond, slave); |
| 1544 | } |
| 1545 | } else if (link == BOND_LINK_UP) { |
| 1546 | /* order a rebalance ASAP */ |
| 1547 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; |
| 1548 | if (bond->alb_info.rlb_enabled) { |
| 1549 | bond->alb_info.rlb_rebalance = 1; |
| 1550 | /* If the updelay module parameter is smaller than the |
| 1551 | * forwarding delay of the switch the rebalance will |
| 1552 | * not work because the rebalance arp replies will |
| 1553 | * not be forwarded to the clients.. |
| 1554 | */ |
| 1555 | } |
| 1556 | } |
| 1557 | } |
| 1558 | |
| 1559 | /** |
| 1560 | * bond_alb_handle_active_change - assign new curr_active_slave |
| 1561 | * @bond: our bonding struct |
| 1562 | * @new_slave: new slave to assign |
| 1563 | * |
| 1564 | * Set the bond->curr_active_slave to @new_slave and handle |
| 1565 | * mac address swapping and promiscuity changes as needed. |
| 1566 | * |
| 1567 | * Caller must hold bond curr_slave_lock for write (or bond lock for write) |
| 1568 | */ |
| 1569 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) |
| 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 (!memcmp(tmp_slave->dev->dev_addr, |
| 1599 | bond->dev->dev_addr, ETH_ALEN)) { |
| 1600 | swap_slave = tmp_slave; |
| 1601 | break; |
| 1602 | } |
| 1603 | } |
| 1604 | } |
| 1605 | |
| 1606 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
| 1607 | if (swap_slave) { |
| 1608 | /* swap mac address */ |
| 1609 | alb_swap_mac_addr(bond, swap_slave, new_slave); |
| 1610 | } else { |
| 1611 | /* set the new_slave to the bond mac address */ |
| 1612 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, |
| 1613 | bond->alb_info.rlb_enabled); |
| 1614 | /* fasten bond mac on new current slave */ |
| 1615 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
| 1616 | } |
| 1617 | } |
| 1618 | |
| 1619 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
| 1620 | { |
| 1621 | struct bonding *bond = bond_dev->priv; |
| 1622 | struct sockaddr *sa = addr; |
| 1623 | struct slave *slave, *swap_slave; |
| 1624 | int res; |
| 1625 | int i; |
| 1626 | |
| 1627 | if (!is_valid_ether_addr(sa->sa_data)) { |
| 1628 | return -EADDRNOTAVAIL; |
| 1629 | } |
| 1630 | |
| 1631 | res = alb_set_mac_address(bond, addr); |
| 1632 | if (res) { |
| 1633 | return res; |
| 1634 | } |
| 1635 | |
| 1636 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); |
| 1637 | |
| 1638 | /* If there is no curr_active_slave there is nothing else to do. |
| 1639 | * Otherwise we'll need to pass the new address to it and handle |
| 1640 | * duplications. |
| 1641 | */ |
| 1642 | if (!bond->curr_active_slave) { |
| 1643 | return 0; |
| 1644 | } |
| 1645 | |
| 1646 | swap_slave = NULL; |
| 1647 | |
| 1648 | bond_for_each_slave(bond, slave, i) { |
| 1649 | if (!memcmp(slave->dev->dev_addr, bond_dev->dev_addr, ETH_ALEN)) { |
| 1650 | swap_slave = slave; |
| 1651 | break; |
| 1652 | } |
| 1653 | } |
| 1654 | |
| 1655 | if (swap_slave) { |
| 1656 | alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave); |
| 1657 | } else { |
| 1658 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr, |
| 1659 | bond->alb_info.rlb_enabled); |
| 1660 | |
| 1661 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
| 1662 | if (bond->alb_info.rlb_enabled) { |
| 1663 | /* inform clients mac address has changed */ |
| 1664 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); |
| 1665 | } |
| 1666 | } |
| 1667 | |
| 1668 | return 0; |
| 1669 | } |
| 1670 | |
| 1671 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) |
| 1672 | { |
| 1673 | if (bond->alb_info.current_alb_vlan && |
| 1674 | (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) { |
| 1675 | bond->alb_info.current_alb_vlan = NULL; |
| 1676 | } |
| 1677 | |
| 1678 | if (bond->alb_info.rlb_enabled) { |
| 1679 | rlb_clear_vlan(bond, vlan_id); |
| 1680 | } |
| 1681 | } |
| 1682 | |