forked from Minki/linux
b88ec38d13
Also, cleanup bond_alb_handle_active_change() from 2 identical ifs. Signed-off-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1781 lines
46 KiB
C
1781 lines
46 KiB
C
/*
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* Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/pkt_sched.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/if_bonding.h>
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#include <linux/if_vlan.h>
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#include <linux/in.h>
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#include <net/ipx.h>
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#include <net/arp.h>
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#include <net/ipv6.h>
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#include <asm/byteorder.h>
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#include "bonding.h"
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#include "bond_alb.h"
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#ifndef __long_aligned
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#define __long_aligned __attribute__((aligned((sizeof(long)))))
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#endif
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static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
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0x33, 0x33, 0x00, 0x00, 0x00, 0x01
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};
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static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
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#pragma pack(1)
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struct learning_pkt {
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u8 mac_dst[ETH_ALEN];
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u8 mac_src[ETH_ALEN];
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__be16 type;
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u8 padding[ETH_ZLEN - ETH_HLEN];
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};
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struct arp_pkt {
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__be16 hw_addr_space;
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__be16 prot_addr_space;
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u8 hw_addr_len;
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u8 prot_addr_len;
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__be16 op_code;
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u8 mac_src[ETH_ALEN]; /* sender hardware address */
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__be32 ip_src; /* sender IP address */
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u8 mac_dst[ETH_ALEN]; /* target hardware address */
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__be32 ip_dst; /* target IP address */
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};
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#pragma pack()
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static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
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{
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return (struct arp_pkt *)skb_network_header(skb);
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}
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/* Forward declaration */
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static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
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static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
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static void rlb_src_unlink(struct bonding *bond, u32 index);
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static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
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u32 ip_dst_hash);
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static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
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{
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int i;
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u8 hash = 0;
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for (i = 0; i < hash_size; i++) {
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hash ^= hash_start[i];
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}
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return hash;
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}
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/*********************** tlb specific functions ***************************/
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static inline void _lock_tx_hashtbl_bh(struct bonding *bond)
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{
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spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
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}
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static inline void _unlock_tx_hashtbl_bh(struct bonding *bond)
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{
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spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
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}
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static inline void _lock_tx_hashtbl(struct bonding *bond)
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{
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spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
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}
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static inline void _unlock_tx_hashtbl(struct bonding *bond)
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{
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spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
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}
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/* Caller must hold tx_hashtbl lock */
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static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
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{
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if (save_load) {
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entry->load_history = 1 + entry->tx_bytes /
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BOND_TLB_REBALANCE_INTERVAL;
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entry->tx_bytes = 0;
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}
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entry->tx_slave = NULL;
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entry->next = TLB_NULL_INDEX;
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entry->prev = TLB_NULL_INDEX;
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}
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static inline void tlb_init_slave(struct slave *slave)
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{
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SLAVE_TLB_INFO(slave).load = 0;
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SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
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}
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/* Caller must hold bond lock for read, BH disabled */
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static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
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int save_load)
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{
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struct tlb_client_info *tx_hash_table;
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u32 index;
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/* clear slave from tx_hashtbl */
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tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
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/* skip this if we've already freed the tx hash table */
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if (tx_hash_table) {
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index = SLAVE_TLB_INFO(slave).head;
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while (index != TLB_NULL_INDEX) {
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u32 next_index = tx_hash_table[index].next;
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tlb_init_table_entry(&tx_hash_table[index], save_load);
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index = next_index;
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}
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}
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tlb_init_slave(slave);
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}
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/* Caller must hold bond lock for read */
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static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
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int save_load)
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{
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_lock_tx_hashtbl_bh(bond);
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__tlb_clear_slave(bond, slave, save_load);
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_unlock_tx_hashtbl_bh(bond);
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}
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/* Must be called before starting the monitor timer */
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static int tlb_initialize(struct bonding *bond)
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{
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struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
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int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
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struct tlb_client_info *new_hashtbl;
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int i;
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new_hashtbl = kzalloc(size, GFP_KERNEL);
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if (!new_hashtbl)
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return -1;
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_lock_tx_hashtbl_bh(bond);
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bond_info->tx_hashtbl = new_hashtbl;
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for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
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tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
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}
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_unlock_tx_hashtbl_bh(bond);
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return 0;
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}
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/* Must be called only after all slaves have been released */
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static void tlb_deinitialize(struct bonding *bond)
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{
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struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
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_lock_tx_hashtbl_bh(bond);
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kfree(bond_info->tx_hashtbl);
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bond_info->tx_hashtbl = NULL;
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_unlock_tx_hashtbl_bh(bond);
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}
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static long long compute_gap(struct slave *slave)
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{
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return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
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(s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
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}
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/* Caller must hold bond lock for read */
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static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
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{
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struct slave *slave, *least_loaded;
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long long max_gap;
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int i;
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least_loaded = NULL;
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max_gap = LLONG_MIN;
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/* Find the slave with the largest gap */
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bond_for_each_slave(bond, slave, i) {
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if (SLAVE_IS_OK(slave)) {
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long long gap = compute_gap(slave);
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if (max_gap < gap) {
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least_loaded = slave;
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max_gap = gap;
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}
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}
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}
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return least_loaded;
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}
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static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
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u32 skb_len)
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{
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struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
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struct tlb_client_info *hash_table;
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struct slave *assigned_slave;
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hash_table = bond_info->tx_hashtbl;
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assigned_slave = hash_table[hash_index].tx_slave;
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if (!assigned_slave) {
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assigned_slave = tlb_get_least_loaded_slave(bond);
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if (assigned_slave) {
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struct tlb_slave_info *slave_info =
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&(SLAVE_TLB_INFO(assigned_slave));
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u32 next_index = slave_info->head;
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hash_table[hash_index].tx_slave = assigned_slave;
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hash_table[hash_index].next = next_index;
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hash_table[hash_index].prev = TLB_NULL_INDEX;
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if (next_index != TLB_NULL_INDEX) {
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hash_table[next_index].prev = hash_index;
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}
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slave_info->head = hash_index;
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slave_info->load +=
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hash_table[hash_index].load_history;
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}
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}
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if (assigned_slave) {
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hash_table[hash_index].tx_bytes += skb_len;
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}
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return assigned_slave;
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}
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/* Caller must hold bond lock for read */
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static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
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u32 skb_len)
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{
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struct slave *tx_slave;
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/*
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* We don't need to disable softirq here, becase
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* tlb_choose_channel() is only called by bond_alb_xmit()
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* which already has softirq disabled.
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*/
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_lock_tx_hashtbl(bond);
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tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
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_unlock_tx_hashtbl(bond);
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return tx_slave;
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}
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/*********************** rlb specific functions ***************************/
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static inline void _lock_rx_hashtbl_bh(struct bonding *bond)
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{
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spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
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}
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static inline void _unlock_rx_hashtbl_bh(struct bonding *bond)
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{
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spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
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}
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static inline void _lock_rx_hashtbl(struct bonding *bond)
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{
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spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
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}
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static inline void _unlock_rx_hashtbl(struct bonding *bond)
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{
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spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
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}
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/* when an ARP REPLY is received from a client update its info
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* in the rx_hashtbl
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*/
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static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
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{
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struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
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struct rlb_client_info *client_info;
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u32 hash_index;
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_lock_rx_hashtbl_bh(bond);
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hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
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client_info = &(bond_info->rx_hashtbl[hash_index]);
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if ((client_info->assigned) &&
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(client_info->ip_src == arp->ip_dst) &&
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(client_info->ip_dst == arp->ip_src) &&
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(!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
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/* update the clients MAC address */
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memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
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client_info->ntt = 1;
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bond_info->rx_ntt = 1;
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}
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_unlock_rx_hashtbl_bh(bond);
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}
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static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
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struct slave *slave)
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{
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struct arp_pkt *arp, _arp;
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if (skb->protocol != cpu_to_be16(ETH_P_ARP))
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goto out;
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arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
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if (!arp)
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goto out;
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/* We received an ARP from arp->ip_src.
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* We might have used this IP address previously (on the bonding host
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* itself or on a system that is bridged together with the bond).
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* However, if arp->mac_src is different than what is stored in
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* rx_hashtbl, some other host is now using the IP and we must prevent
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* sending out client updates with this IP address and the old MAC
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* address.
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* Clean up all hash table entries that have this address as ip_src but
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* have a different mac_src.
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*/
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rlb_purge_src_ip(bond, arp);
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if (arp->op_code == htons(ARPOP_REPLY)) {
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/* update rx hash table for this ARP */
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rlb_update_entry_from_arp(bond, arp);
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pr_debug("Server received an ARP Reply from client\n");
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}
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out:
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return RX_HANDLER_ANOTHER;
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}
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/* Caller must hold bond lock for read */
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static struct slave *rlb_next_rx_slave(struct bonding *bond)
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{
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struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
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struct slave *rx_slave, *slave, *start_at;
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int i = 0;
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if (bond_info->next_rx_slave) {
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start_at = bond_info->next_rx_slave;
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} else {
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start_at = bond->first_slave;
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}
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rx_slave = NULL;
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bond_for_each_slave_from(bond, slave, i, start_at) {
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if (SLAVE_IS_OK(slave)) {
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if (!rx_slave) {
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rx_slave = slave;
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} else if (slave->speed > rx_slave->speed) {
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rx_slave = slave;
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}
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}
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}
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if (rx_slave) {
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bond_info->next_rx_slave = rx_slave->next;
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}
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return rx_slave;
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}
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/* teach the switch the mac of a disabled slave
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* on the primary for fault tolerance
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*
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* Caller must hold bond->curr_slave_lock for write or bond lock for write
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*/
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static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
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{
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if (!bond->curr_active_slave) {
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return;
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}
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if (!bond->alb_info.primary_is_promisc) {
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if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
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bond->alb_info.primary_is_promisc = 1;
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else
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bond->alb_info.primary_is_promisc = 0;
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}
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bond->alb_info.rlb_promisc_timeout_counter = 0;
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alb_send_learning_packets(bond->curr_active_slave, addr);
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}
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/* slave being removed should not be active at this point
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*
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* Caller must hold bond lock for read
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*/
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static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
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{
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struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
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struct rlb_client_info *rx_hash_table;
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u32 index, next_index;
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/* clear slave from rx_hashtbl */
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_lock_rx_hashtbl_bh(bond);
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rx_hash_table = bond_info->rx_hashtbl;
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index = bond_info->rx_hashtbl_used_head;
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for (; index != RLB_NULL_INDEX; index = next_index) {
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next_index = rx_hash_table[index].used_next;
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if (rx_hash_table[index].slave == slave) {
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struct slave *assigned_slave = rlb_next_rx_slave(bond);
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if (assigned_slave) {
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rx_hash_table[index].slave = assigned_slave;
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if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
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mac_bcast)) {
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bond_info->rx_hashtbl[index].ntt = 1;
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bond_info->rx_ntt = 1;
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/* A slave has been removed from the
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* table because it is either disabled
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* or being released. We must retry the
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* update to avoid clients from not
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* being updated & disconnecting when
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* there is stress
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*/
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bond_info->rlb_update_retry_counter =
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RLB_UPDATE_RETRY;
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}
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} else { /* there is no active slave */
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rx_hash_table[index].slave = NULL;
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}
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}
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}
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_unlock_rx_hashtbl_bh(bond);
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write_lock_bh(&bond->curr_slave_lock);
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if (slave != bond->curr_active_slave) {
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rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
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}
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write_unlock_bh(&bond->curr_slave_lock);
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}
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static void rlb_update_client(struct rlb_client_info *client_info)
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{
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int i;
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if (!client_info->slave) {
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return;
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}
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for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
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struct sk_buff *skb;
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skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
|
|
client_info->ip_dst,
|
|
client_info->slave->dev,
|
|
client_info->ip_src,
|
|
client_info->mac_dst,
|
|
client_info->slave->dev->dev_addr,
|
|
client_info->mac_dst);
|
|
if (!skb) {
|
|
pr_err("%s: Error: failed to create an ARP packet\n",
|
|
client_info->slave->bond->dev->name);
|
|
continue;
|
|
}
|
|
|
|
skb->dev = client_info->slave->dev;
|
|
|
|
if (client_info->tag) {
|
|
skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id);
|
|
if (!skb) {
|
|
pr_err("%s: Error: failed to insert VLAN tag\n",
|
|
client_info->slave->bond->dev->name);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
arp_xmit(skb);
|
|
}
|
|
}
|
|
|
|
/* sends ARP REPLIES that update the clients that need updating */
|
|
static void rlb_update_rx_clients(struct bonding *bond)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct rlb_client_info *client_info;
|
|
u32 hash_index;
|
|
|
|
_lock_rx_hashtbl_bh(bond);
|
|
|
|
hash_index = bond_info->rx_hashtbl_used_head;
|
|
for (; hash_index != RLB_NULL_INDEX;
|
|
hash_index = client_info->used_next) {
|
|
client_info = &(bond_info->rx_hashtbl[hash_index]);
|
|
if (client_info->ntt) {
|
|
rlb_update_client(client_info);
|
|
if (bond_info->rlb_update_retry_counter == 0) {
|
|
client_info->ntt = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* do not update the entries again until this counter is zero so that
|
|
* not to confuse the clients.
|
|
*/
|
|
bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
|
|
|
|
_unlock_rx_hashtbl_bh(bond);
|
|
}
|
|
|
|
/* The slave was assigned a new mac address - update the clients */
|
|
static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct rlb_client_info *client_info;
|
|
int ntt = 0;
|
|
u32 hash_index;
|
|
|
|
_lock_rx_hashtbl_bh(bond);
|
|
|
|
hash_index = bond_info->rx_hashtbl_used_head;
|
|
for (; hash_index != RLB_NULL_INDEX;
|
|
hash_index = client_info->used_next) {
|
|
client_info = &(bond_info->rx_hashtbl[hash_index]);
|
|
|
|
if ((client_info->slave == slave) &&
|
|
!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
|
|
client_info->ntt = 1;
|
|
ntt = 1;
|
|
}
|
|
}
|
|
|
|
// update the team's flag only after the whole iteration
|
|
if (ntt) {
|
|
bond_info->rx_ntt = 1;
|
|
//fasten the change
|
|
bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
|
|
}
|
|
|
|
_unlock_rx_hashtbl_bh(bond);
|
|
}
|
|
|
|
/* mark all clients using src_ip to be updated */
|
|
static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct rlb_client_info *client_info;
|
|
u32 hash_index;
|
|
|
|
_lock_rx_hashtbl(bond);
|
|
|
|
hash_index = bond_info->rx_hashtbl_used_head;
|
|
for (; hash_index != RLB_NULL_INDEX;
|
|
hash_index = client_info->used_next) {
|
|
client_info = &(bond_info->rx_hashtbl[hash_index]);
|
|
|
|
if (!client_info->slave) {
|
|
pr_err("%s: Error: found a client with no channel in the client's hash table\n",
|
|
bond->dev->name);
|
|
continue;
|
|
}
|
|
/*update all clients using this src_ip, that are not assigned
|
|
* to the team's address (curr_active_slave) and have a known
|
|
* unicast mac address.
|
|
*/
|
|
if ((client_info->ip_src == src_ip) &&
|
|
!ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
|
|
bond->dev->dev_addr) &&
|
|
!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
|
|
client_info->ntt = 1;
|
|
bond_info->rx_ntt = 1;
|
|
}
|
|
}
|
|
|
|
_unlock_rx_hashtbl(bond);
|
|
}
|
|
|
|
/* Caller must hold both bond and ptr locks for read */
|
|
static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct arp_pkt *arp = arp_pkt(skb);
|
|
struct slave *assigned_slave;
|
|
struct rlb_client_info *client_info;
|
|
u32 hash_index = 0;
|
|
|
|
_lock_rx_hashtbl(bond);
|
|
|
|
hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
|
|
client_info = &(bond_info->rx_hashtbl[hash_index]);
|
|
|
|
if (client_info->assigned) {
|
|
if ((client_info->ip_src == arp->ip_src) &&
|
|
(client_info->ip_dst == arp->ip_dst)) {
|
|
/* the entry is already assigned to this client */
|
|
if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
|
|
/* update mac address from arp */
|
|
memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
|
|
}
|
|
memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN);
|
|
|
|
assigned_slave = client_info->slave;
|
|
if (assigned_slave) {
|
|
_unlock_rx_hashtbl(bond);
|
|
return assigned_slave;
|
|
}
|
|
} else {
|
|
/* the entry is already assigned to some other client,
|
|
* move the old client to primary (curr_active_slave) so
|
|
* that the new client can be assigned to this entry.
|
|
*/
|
|
if (bond->curr_active_slave &&
|
|
client_info->slave != bond->curr_active_slave) {
|
|
client_info->slave = bond->curr_active_slave;
|
|
rlb_update_client(client_info);
|
|
}
|
|
}
|
|
}
|
|
/* assign a new slave */
|
|
assigned_slave = rlb_next_rx_slave(bond);
|
|
|
|
if (assigned_slave) {
|
|
if (!(client_info->assigned &&
|
|
client_info->ip_src == arp->ip_src)) {
|
|
/* ip_src is going to be updated,
|
|
* fix the src hash list
|
|
*/
|
|
u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
|
|
sizeof(arp->ip_src));
|
|
rlb_src_unlink(bond, hash_index);
|
|
rlb_src_link(bond, hash_src, hash_index);
|
|
}
|
|
|
|
client_info->ip_src = arp->ip_src;
|
|
client_info->ip_dst = arp->ip_dst;
|
|
/* arp->mac_dst is broadcast for arp reqeusts.
|
|
* will be updated with clients actual unicast mac address
|
|
* upon receiving an arp reply.
|
|
*/
|
|
memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
|
|
memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN);
|
|
client_info->slave = assigned_slave;
|
|
|
|
if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
|
|
client_info->ntt = 1;
|
|
bond->alb_info.rx_ntt = 1;
|
|
} else {
|
|
client_info->ntt = 0;
|
|
}
|
|
|
|
if (bond_vlan_used(bond)) {
|
|
if (!vlan_get_tag(skb, &client_info->vlan_id))
|
|
client_info->tag = 1;
|
|
}
|
|
|
|
if (!client_info->assigned) {
|
|
u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
|
|
bond_info->rx_hashtbl_used_head = hash_index;
|
|
client_info->used_next = prev_tbl_head;
|
|
if (prev_tbl_head != RLB_NULL_INDEX) {
|
|
bond_info->rx_hashtbl[prev_tbl_head].used_prev =
|
|
hash_index;
|
|
}
|
|
client_info->assigned = 1;
|
|
}
|
|
}
|
|
|
|
_unlock_rx_hashtbl(bond);
|
|
|
|
return assigned_slave;
|
|
}
|
|
|
|
/* chooses (and returns) transmit channel for arp reply
|
|
* does not choose channel for other arp types since they are
|
|
* sent on the curr_active_slave
|
|
*/
|
|
static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
|
|
{
|
|
struct arp_pkt *arp = arp_pkt(skb);
|
|
struct slave *tx_slave = NULL;
|
|
|
|
/* Don't modify or load balance ARPs that do not originate locally
|
|
* (e.g.,arrive via a bridge).
|
|
*/
|
|
if (!bond_slave_has_mac(bond, arp->mac_src))
|
|
return NULL;
|
|
|
|
if (arp->op_code == htons(ARPOP_REPLY)) {
|
|
/* the arp must be sent on the selected
|
|
* rx channel
|
|
*/
|
|
tx_slave = rlb_choose_channel(skb, bond);
|
|
if (tx_slave) {
|
|
memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
|
|
}
|
|
pr_debug("Server sent ARP Reply packet\n");
|
|
} else if (arp->op_code == htons(ARPOP_REQUEST)) {
|
|
/* Create an entry in the rx_hashtbl for this client as a
|
|
* place holder.
|
|
* When the arp reply is received the entry will be updated
|
|
* with the correct unicast address of the client.
|
|
*/
|
|
rlb_choose_channel(skb, bond);
|
|
|
|
/* The ARP reply packets must be delayed so that
|
|
* they can cancel out the influence of the ARP request.
|
|
*/
|
|
bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
|
|
|
|
/* arp requests are broadcast and are sent on the primary
|
|
* the arp request will collapse all clients on the subnet to
|
|
* the primary slave. We must register these clients to be
|
|
* updated with their assigned mac.
|
|
*/
|
|
rlb_req_update_subnet_clients(bond, arp->ip_src);
|
|
pr_debug("Server sent ARP Request packet\n");
|
|
}
|
|
|
|
return tx_slave;
|
|
}
|
|
|
|
/* Caller must hold bond lock for read */
|
|
static void rlb_rebalance(struct bonding *bond)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct slave *assigned_slave;
|
|
struct rlb_client_info *client_info;
|
|
int ntt;
|
|
u32 hash_index;
|
|
|
|
_lock_rx_hashtbl_bh(bond);
|
|
|
|
ntt = 0;
|
|
hash_index = bond_info->rx_hashtbl_used_head;
|
|
for (; hash_index != RLB_NULL_INDEX;
|
|
hash_index = client_info->used_next) {
|
|
client_info = &(bond_info->rx_hashtbl[hash_index]);
|
|
assigned_slave = rlb_next_rx_slave(bond);
|
|
if (assigned_slave && (client_info->slave != assigned_slave)) {
|
|
client_info->slave = assigned_slave;
|
|
client_info->ntt = 1;
|
|
ntt = 1;
|
|
}
|
|
}
|
|
|
|
/* update the team's flag only after the whole iteration */
|
|
if (ntt) {
|
|
bond_info->rx_ntt = 1;
|
|
}
|
|
_unlock_rx_hashtbl_bh(bond);
|
|
}
|
|
|
|
/* Caller must hold rx_hashtbl lock */
|
|
static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
|
|
{
|
|
entry->used_next = RLB_NULL_INDEX;
|
|
entry->used_prev = RLB_NULL_INDEX;
|
|
entry->assigned = 0;
|
|
entry->slave = NULL;
|
|
entry->tag = 0;
|
|
}
|
|
static void rlb_init_table_entry_src(struct rlb_client_info *entry)
|
|
{
|
|
entry->src_first = RLB_NULL_INDEX;
|
|
entry->src_prev = RLB_NULL_INDEX;
|
|
entry->src_next = RLB_NULL_INDEX;
|
|
}
|
|
|
|
static void rlb_init_table_entry(struct rlb_client_info *entry)
|
|
{
|
|
memset(entry, 0, sizeof(struct rlb_client_info));
|
|
rlb_init_table_entry_dst(entry);
|
|
rlb_init_table_entry_src(entry);
|
|
}
|
|
|
|
static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
u32 next_index = bond_info->rx_hashtbl[index].used_next;
|
|
u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
|
|
|
|
if (index == bond_info->rx_hashtbl_used_head)
|
|
bond_info->rx_hashtbl_used_head = next_index;
|
|
if (prev_index != RLB_NULL_INDEX)
|
|
bond_info->rx_hashtbl[prev_index].used_next = next_index;
|
|
if (next_index != RLB_NULL_INDEX)
|
|
bond_info->rx_hashtbl[next_index].used_prev = prev_index;
|
|
}
|
|
|
|
/* unlink a rlb hash table entry from the src list */
|
|
static void rlb_src_unlink(struct bonding *bond, u32 index)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
u32 next_index = bond_info->rx_hashtbl[index].src_next;
|
|
u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
|
|
|
|
bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
|
|
bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
|
|
|
|
if (next_index != RLB_NULL_INDEX)
|
|
bond_info->rx_hashtbl[next_index].src_prev = prev_index;
|
|
|
|
if (prev_index == RLB_NULL_INDEX)
|
|
return;
|
|
|
|
/* is prev_index pointing to the head of this list? */
|
|
if (bond_info->rx_hashtbl[prev_index].src_first == index)
|
|
bond_info->rx_hashtbl[prev_index].src_first = next_index;
|
|
else
|
|
bond_info->rx_hashtbl[prev_index].src_next = next_index;
|
|
|
|
}
|
|
|
|
static void rlb_delete_table_entry(struct bonding *bond, u32 index)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
|
|
|
|
rlb_delete_table_entry_dst(bond, index);
|
|
rlb_init_table_entry_dst(entry);
|
|
|
|
rlb_src_unlink(bond, index);
|
|
}
|
|
|
|
/* add the rx_hashtbl[ip_dst_hash] entry to the list
|
|
* of entries with identical ip_src_hash
|
|
*/
|
|
static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
u32 next;
|
|
|
|
bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
|
|
next = bond_info->rx_hashtbl[ip_src_hash].src_first;
|
|
bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
|
|
if (next != RLB_NULL_INDEX)
|
|
bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
|
|
bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
|
|
}
|
|
|
|
/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
|
|
* not match arp->mac_src */
|
|
static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
u32 ip_src_hash = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
|
|
u32 index;
|
|
|
|
_lock_rx_hashtbl_bh(bond);
|
|
|
|
index = bond_info->rx_hashtbl[ip_src_hash].src_first;
|
|
while (index != RLB_NULL_INDEX) {
|
|
struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
|
|
u32 next_index = entry->src_next;
|
|
if (entry->ip_src == arp->ip_src &&
|
|
!ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
|
|
rlb_delete_table_entry(bond, index);
|
|
index = next_index;
|
|
}
|
|
_unlock_rx_hashtbl_bh(bond);
|
|
}
|
|
|
|
static int rlb_initialize(struct bonding *bond)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct rlb_client_info *new_hashtbl;
|
|
int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
|
|
int i;
|
|
|
|
new_hashtbl = kmalloc(size, GFP_KERNEL);
|
|
if (!new_hashtbl)
|
|
return -1;
|
|
|
|
_lock_rx_hashtbl_bh(bond);
|
|
|
|
bond_info->rx_hashtbl = new_hashtbl;
|
|
|
|
bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
|
|
|
|
for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
|
|
rlb_init_table_entry(bond_info->rx_hashtbl + i);
|
|
}
|
|
|
|
_unlock_rx_hashtbl_bh(bond);
|
|
|
|
/* register to receive ARPs */
|
|
bond->recv_probe = rlb_arp_recv;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rlb_deinitialize(struct bonding *bond)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
|
|
_lock_rx_hashtbl_bh(bond);
|
|
|
|
kfree(bond_info->rx_hashtbl);
|
|
bond_info->rx_hashtbl = NULL;
|
|
bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
|
|
|
|
_unlock_rx_hashtbl_bh(bond);
|
|
}
|
|
|
|
static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
u32 curr_index;
|
|
|
|
_lock_rx_hashtbl_bh(bond);
|
|
|
|
curr_index = bond_info->rx_hashtbl_used_head;
|
|
while (curr_index != RLB_NULL_INDEX) {
|
|
struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
|
|
u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
|
|
|
|
if (curr->tag && (curr->vlan_id == vlan_id))
|
|
rlb_delete_table_entry(bond, curr_index);
|
|
|
|
curr_index = next_index;
|
|
}
|
|
|
|
_unlock_rx_hashtbl_bh(bond);
|
|
}
|
|
|
|
/*********************** tlb/rlb shared functions *********************/
|
|
|
|
static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
|
|
{
|
|
struct bonding *bond = bond_get_bond_by_slave(slave);
|
|
struct learning_pkt pkt;
|
|
int size = sizeof(struct learning_pkt);
|
|
int i;
|
|
|
|
memset(&pkt, 0, size);
|
|
memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
|
|
memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
|
|
pkt.type = cpu_to_be16(ETH_P_LOOP);
|
|
|
|
for (i = 0; i < MAX_LP_BURST; i++) {
|
|
struct sk_buff *skb;
|
|
char *data;
|
|
|
|
skb = dev_alloc_skb(size);
|
|
if (!skb) {
|
|
return;
|
|
}
|
|
|
|
data = skb_put(skb, size);
|
|
memcpy(data, &pkt, size);
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb->network_header = skb->mac_header + ETH_HLEN;
|
|
skb->protocol = pkt.type;
|
|
skb->priority = TC_PRIO_CONTROL;
|
|
skb->dev = slave->dev;
|
|
|
|
if (bond_vlan_used(bond)) {
|
|
struct vlan_entry *vlan;
|
|
|
|
vlan = bond_next_vlan(bond,
|
|
bond->alb_info.current_alb_vlan);
|
|
|
|
bond->alb_info.current_alb_vlan = vlan;
|
|
if (!vlan) {
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
|
|
skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan->vlan_id);
|
|
if (!skb) {
|
|
pr_err("%s: Error: failed to insert VLAN tag\n",
|
|
bond->dev->name);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
dev_queue_xmit(skb);
|
|
}
|
|
}
|
|
|
|
static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
|
|
{
|
|
struct net_device *dev = slave->dev;
|
|
struct sockaddr s_addr;
|
|
|
|
if (slave->bond->params.mode == BOND_MODE_TLB) {
|
|
memcpy(dev->dev_addr, addr, dev->addr_len);
|
|
return 0;
|
|
}
|
|
|
|
/* for rlb each slave must have a unique hw mac addresses so that */
|
|
/* each slave will receive packets destined to a different mac */
|
|
memcpy(s_addr.sa_data, addr, dev->addr_len);
|
|
s_addr.sa_family = dev->type;
|
|
if (dev_set_mac_address(dev, &s_addr)) {
|
|
pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
|
|
"ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
|
|
slave->bond->dev->name, dev->name);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Swap MAC addresses between two slaves.
|
|
*
|
|
* Called with RTNL held, and no other locks.
|
|
*
|
|
*/
|
|
|
|
static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
|
|
{
|
|
u8 tmp_mac_addr[ETH_ALEN];
|
|
|
|
memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
|
|
alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
|
|
alb_set_slave_mac_addr(slave2, tmp_mac_addr);
|
|
|
|
}
|
|
|
|
/*
|
|
* Send learning packets after MAC address swap.
|
|
*
|
|
* Called with RTNL and no other locks
|
|
*/
|
|
static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
|
|
struct slave *slave2)
|
|
{
|
|
int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
|
|
struct slave *disabled_slave = NULL;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* fasten the change in the switch */
|
|
if (SLAVE_IS_OK(slave1)) {
|
|
alb_send_learning_packets(slave1, slave1->dev->dev_addr);
|
|
if (bond->alb_info.rlb_enabled) {
|
|
/* inform the clients that the mac address
|
|
* has changed
|
|
*/
|
|
rlb_req_update_slave_clients(bond, slave1);
|
|
}
|
|
} else {
|
|
disabled_slave = slave1;
|
|
}
|
|
|
|
if (SLAVE_IS_OK(slave2)) {
|
|
alb_send_learning_packets(slave2, slave2->dev->dev_addr);
|
|
if (bond->alb_info.rlb_enabled) {
|
|
/* inform the clients that the mac address
|
|
* has changed
|
|
*/
|
|
rlb_req_update_slave_clients(bond, slave2);
|
|
}
|
|
} else {
|
|
disabled_slave = slave2;
|
|
}
|
|
|
|
if (bond->alb_info.rlb_enabled && slaves_state_differ) {
|
|
/* A disabled slave was assigned an active mac addr */
|
|
rlb_teach_disabled_mac_on_primary(bond,
|
|
disabled_slave->dev->dev_addr);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* alb_change_hw_addr_on_detach
|
|
* @bond: bonding we're working on
|
|
* @slave: the slave that was just detached
|
|
*
|
|
* We assume that @slave was already detached from the slave list.
|
|
*
|
|
* If @slave's permanent hw address is different both from its current
|
|
* address and from @bond's address, then somewhere in the bond there's
|
|
* a slave that has @slave's permanet address as its current address.
|
|
* We'll make sure that that slave no longer uses @slave's permanent address.
|
|
*
|
|
* Caller must hold RTNL and no other locks
|
|
*/
|
|
static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
|
|
{
|
|
int perm_curr_diff;
|
|
int perm_bond_diff;
|
|
struct slave *found_slave;
|
|
|
|
perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
|
|
slave->dev->dev_addr);
|
|
perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
|
|
bond->dev->dev_addr);
|
|
|
|
if (perm_curr_diff && perm_bond_diff) {
|
|
found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
|
|
|
|
if (found_slave) {
|
|
/* locking: needs RTNL and nothing else */
|
|
alb_swap_mac_addr(slave, found_slave);
|
|
alb_fasten_mac_swap(bond, slave, found_slave);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* alb_handle_addr_collision_on_attach
|
|
* @bond: bonding we're working on
|
|
* @slave: the slave that was just attached
|
|
*
|
|
* checks uniqueness of slave's mac address and handles the case the
|
|
* new slave uses the bonds mac address.
|
|
*
|
|
* If the permanent hw address of @slave is @bond's hw address, we need to
|
|
* find a different hw address to give @slave, that isn't in use by any other
|
|
* slave in the bond. This address must be, of course, one of the permanent
|
|
* addresses of the other slaves.
|
|
*
|
|
* We go over the slave list, and for each slave there we compare its
|
|
* permanent hw address with the current address of all the other slaves.
|
|
* If no match was found, then we've found a slave with a permanent address
|
|
* that isn't used by any other slave in the bond, so we can assign it to
|
|
* @slave.
|
|
*
|
|
* assumption: this function is called before @slave is attached to the
|
|
* bond slave list.
|
|
*/
|
|
static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
|
|
{
|
|
struct slave *tmp_slave1, *free_mac_slave = NULL;
|
|
struct slave *has_bond_addr = bond->curr_active_slave;
|
|
int i;
|
|
|
|
if (bond->slave_cnt == 0) {
|
|
/* this is the first slave */
|
|
return 0;
|
|
}
|
|
|
|
/* if slave's mac address differs from bond's mac address
|
|
* check uniqueness of slave's mac address against the other
|
|
* slaves in the bond.
|
|
*/
|
|
if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
|
|
if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
|
|
return 0;
|
|
|
|
/* Try setting slave mac to bond address and fall-through
|
|
to code handling that situation below... */
|
|
alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
|
|
}
|
|
|
|
/* The slave's address is equal to the address of the bond.
|
|
* Search for a spare address in the bond for this slave.
|
|
*/
|
|
bond_for_each_slave(bond, tmp_slave1, i) {
|
|
if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
|
|
/* no slave has tmp_slave1's perm addr
|
|
* as its curr addr
|
|
*/
|
|
free_mac_slave = tmp_slave1;
|
|
break;
|
|
}
|
|
|
|
if (!has_bond_addr) {
|
|
if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
|
|
bond->dev->dev_addr)) {
|
|
|
|
has_bond_addr = tmp_slave1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (free_mac_slave) {
|
|
alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
|
|
|
|
pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
|
|
bond->dev->name, slave->dev->name,
|
|
free_mac_slave->dev->name);
|
|
|
|
} else if (has_bond_addr) {
|
|
pr_err("%s: Error: the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n",
|
|
bond->dev->name, slave->dev->name);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* alb_set_mac_address
|
|
* @bond:
|
|
* @addr:
|
|
*
|
|
* In TLB mode all slaves are configured to the bond's hw address, but set
|
|
* their dev_addr field to different addresses (based on their permanent hw
|
|
* addresses).
|
|
*
|
|
* For each slave, this function sets the interface to the new address and then
|
|
* changes its dev_addr field to its previous value.
|
|
*
|
|
* Unwinding assumes bond's mac address has not yet changed.
|
|
*/
|
|
static int alb_set_mac_address(struct bonding *bond, void *addr)
|
|
{
|
|
struct sockaddr sa;
|
|
struct slave *slave, *stop_at;
|
|
char tmp_addr[ETH_ALEN];
|
|
int res;
|
|
int i;
|
|
|
|
if (bond->alb_info.rlb_enabled) {
|
|
return 0;
|
|
}
|
|
|
|
bond_for_each_slave(bond, slave, i) {
|
|
/* save net_device's current hw address */
|
|
memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
|
|
|
|
res = dev_set_mac_address(slave->dev, addr);
|
|
|
|
/* restore net_device's hw address */
|
|
memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
|
|
|
|
if (res)
|
|
goto unwind;
|
|
}
|
|
|
|
return 0;
|
|
|
|
unwind:
|
|
memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
|
|
sa.sa_family = bond->dev->type;
|
|
|
|
/* unwind from head to the slave that failed */
|
|
stop_at = slave;
|
|
bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
|
|
memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
|
|
dev_set_mac_address(slave->dev, &sa);
|
|
memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/************************ exported alb funcions ************************/
|
|
|
|
int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
|
|
{
|
|
int res;
|
|
|
|
res = tlb_initialize(bond);
|
|
if (res) {
|
|
return res;
|
|
}
|
|
|
|
if (rlb_enabled) {
|
|
bond->alb_info.rlb_enabled = 1;
|
|
/* initialize rlb */
|
|
res = rlb_initialize(bond);
|
|
if (res) {
|
|
tlb_deinitialize(bond);
|
|
return res;
|
|
}
|
|
} else {
|
|
bond->alb_info.rlb_enabled = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bond_alb_deinitialize(struct bonding *bond)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
|
|
tlb_deinitialize(bond);
|
|
|
|
if (bond_info->rlb_enabled) {
|
|
rlb_deinitialize(bond);
|
|
}
|
|
}
|
|
|
|
int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
|
|
{
|
|
struct bonding *bond = netdev_priv(bond_dev);
|
|
struct ethhdr *eth_data;
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct slave *tx_slave = NULL;
|
|
static const __be32 ip_bcast = htonl(0xffffffff);
|
|
int hash_size = 0;
|
|
int do_tx_balance = 1;
|
|
u32 hash_index = 0;
|
|
const u8 *hash_start = NULL;
|
|
int res = 1;
|
|
struct ipv6hdr *ip6hdr;
|
|
|
|
skb_reset_mac_header(skb);
|
|
eth_data = eth_hdr(skb);
|
|
|
|
/* make sure that the curr_active_slave do not change during tx
|
|
*/
|
|
read_lock(&bond->curr_slave_lock);
|
|
|
|
switch (ntohs(skb->protocol)) {
|
|
case ETH_P_IP: {
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
|
|
if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
|
|
(iph->daddr == ip_bcast) ||
|
|
(iph->protocol == IPPROTO_IGMP)) {
|
|
do_tx_balance = 0;
|
|
break;
|
|
}
|
|
hash_start = (char *)&(iph->daddr);
|
|
hash_size = sizeof(iph->daddr);
|
|
}
|
|
break;
|
|
case ETH_P_IPV6:
|
|
/* IPv6 doesn't really use broadcast mac address, but leave
|
|
* that here just in case.
|
|
*/
|
|
if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
|
|
do_tx_balance = 0;
|
|
break;
|
|
}
|
|
|
|
/* IPv6 uses all-nodes multicast as an equivalent to
|
|
* broadcasts in IPv4.
|
|
*/
|
|
if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
|
|
do_tx_balance = 0;
|
|
break;
|
|
}
|
|
|
|
/* Additianally, DAD probes should not be tx-balanced as that
|
|
* will lead to false positives for duplicate addresses and
|
|
* prevent address configuration from working.
|
|
*/
|
|
ip6hdr = ipv6_hdr(skb);
|
|
if (ipv6_addr_any(&ip6hdr->saddr)) {
|
|
do_tx_balance = 0;
|
|
break;
|
|
}
|
|
|
|
hash_start = (char *)&(ipv6_hdr(skb)->daddr);
|
|
hash_size = sizeof(ipv6_hdr(skb)->daddr);
|
|
break;
|
|
case ETH_P_IPX:
|
|
if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
|
|
/* something is wrong with this packet */
|
|
do_tx_balance = 0;
|
|
break;
|
|
}
|
|
|
|
if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
|
|
/* The only protocol worth balancing in
|
|
* this family since it has an "ARP" like
|
|
* mechanism
|
|
*/
|
|
do_tx_balance = 0;
|
|
break;
|
|
}
|
|
|
|
hash_start = (char*)eth_data->h_dest;
|
|
hash_size = ETH_ALEN;
|
|
break;
|
|
case ETH_P_ARP:
|
|
do_tx_balance = 0;
|
|
if (bond_info->rlb_enabled) {
|
|
tx_slave = rlb_arp_xmit(skb, bond);
|
|
}
|
|
break;
|
|
default:
|
|
do_tx_balance = 0;
|
|
break;
|
|
}
|
|
|
|
if (do_tx_balance) {
|
|
hash_index = _simple_hash(hash_start, hash_size);
|
|
tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
|
|
}
|
|
|
|
if (!tx_slave) {
|
|
/* unbalanced or unassigned, send through primary */
|
|
tx_slave = bond->curr_active_slave;
|
|
bond_info->unbalanced_load += skb->len;
|
|
}
|
|
|
|
if (tx_slave && SLAVE_IS_OK(tx_slave)) {
|
|
if (tx_slave != bond->curr_active_slave) {
|
|
memcpy(eth_data->h_source,
|
|
tx_slave->dev->dev_addr,
|
|
ETH_ALEN);
|
|
}
|
|
|
|
res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
|
|
} else {
|
|
if (tx_slave) {
|
|
_lock_tx_hashtbl(bond);
|
|
__tlb_clear_slave(bond, tx_slave, 0);
|
|
_unlock_tx_hashtbl(bond);
|
|
}
|
|
}
|
|
|
|
read_unlock(&bond->curr_slave_lock);
|
|
|
|
if (res) {
|
|
/* no suitable interface, frame not sent */
|
|
kfree_skb(skb);
|
|
}
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
void bond_alb_monitor(struct work_struct *work)
|
|
{
|
|
struct bonding *bond = container_of(work, struct bonding,
|
|
alb_work.work);
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
struct slave *slave;
|
|
int i;
|
|
|
|
read_lock(&bond->lock);
|
|
|
|
if (bond->slave_cnt == 0) {
|
|
bond_info->tx_rebalance_counter = 0;
|
|
bond_info->lp_counter = 0;
|
|
goto re_arm;
|
|
}
|
|
|
|
bond_info->tx_rebalance_counter++;
|
|
bond_info->lp_counter++;
|
|
|
|
/* send learning packets */
|
|
if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
|
|
/* change of curr_active_slave involves swapping of mac addresses.
|
|
* in order to avoid this swapping from happening while
|
|
* sending the learning packets, the curr_slave_lock must be held for
|
|
* read.
|
|
*/
|
|
read_lock(&bond->curr_slave_lock);
|
|
|
|
bond_for_each_slave(bond, slave, i) {
|
|
alb_send_learning_packets(slave, slave->dev->dev_addr);
|
|
}
|
|
|
|
read_unlock(&bond->curr_slave_lock);
|
|
|
|
bond_info->lp_counter = 0;
|
|
}
|
|
|
|
/* rebalance tx traffic */
|
|
if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
|
|
|
|
read_lock(&bond->curr_slave_lock);
|
|
|
|
bond_for_each_slave(bond, slave, i) {
|
|
tlb_clear_slave(bond, slave, 1);
|
|
if (slave == bond->curr_active_slave) {
|
|
SLAVE_TLB_INFO(slave).load =
|
|
bond_info->unbalanced_load /
|
|
BOND_TLB_REBALANCE_INTERVAL;
|
|
bond_info->unbalanced_load = 0;
|
|
}
|
|
}
|
|
|
|
read_unlock(&bond->curr_slave_lock);
|
|
|
|
bond_info->tx_rebalance_counter = 0;
|
|
}
|
|
|
|
/* handle rlb stuff */
|
|
if (bond_info->rlb_enabled) {
|
|
if (bond_info->primary_is_promisc &&
|
|
(++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
|
|
|
|
/*
|
|
* dev_set_promiscuity requires rtnl and
|
|
* nothing else. Avoid race with bond_close.
|
|
*/
|
|
read_unlock(&bond->lock);
|
|
if (!rtnl_trylock()) {
|
|
read_lock(&bond->lock);
|
|
goto re_arm;
|
|
}
|
|
|
|
bond_info->rlb_promisc_timeout_counter = 0;
|
|
|
|
/* If the primary was set to promiscuous mode
|
|
* because a slave was disabled then
|
|
* it can now leave promiscuous mode.
|
|
*/
|
|
dev_set_promiscuity(bond->curr_active_slave->dev, -1);
|
|
bond_info->primary_is_promisc = 0;
|
|
|
|
rtnl_unlock();
|
|
read_lock(&bond->lock);
|
|
}
|
|
|
|
if (bond_info->rlb_rebalance) {
|
|
bond_info->rlb_rebalance = 0;
|
|
rlb_rebalance(bond);
|
|
}
|
|
|
|
/* check if clients need updating */
|
|
if (bond_info->rx_ntt) {
|
|
if (bond_info->rlb_update_delay_counter) {
|
|
--bond_info->rlb_update_delay_counter;
|
|
} else {
|
|
rlb_update_rx_clients(bond);
|
|
if (bond_info->rlb_update_retry_counter) {
|
|
--bond_info->rlb_update_retry_counter;
|
|
} else {
|
|
bond_info->rx_ntt = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
re_arm:
|
|
queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
|
|
|
|
read_unlock(&bond->lock);
|
|
}
|
|
|
|
/* assumption: called before the slave is attached to the bond
|
|
* and not locked by the bond lock
|
|
*/
|
|
int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
|
|
{
|
|
int res;
|
|
|
|
res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
|
|
if (res) {
|
|
return res;
|
|
}
|
|
|
|
res = alb_handle_addr_collision_on_attach(bond, slave);
|
|
if (res) {
|
|
return res;
|
|
}
|
|
|
|
tlb_init_slave(slave);
|
|
|
|
/* order a rebalance ASAP */
|
|
bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
|
|
|
|
if (bond->alb_info.rlb_enabled) {
|
|
bond->alb_info.rlb_rebalance = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
|
|
* if necessary.
|
|
*
|
|
* Caller must hold RTNL and no other locks
|
|
*/
|
|
void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
|
|
{
|
|
if (bond->slave_cnt > 1) {
|
|
alb_change_hw_addr_on_detach(bond, slave);
|
|
}
|
|
|
|
tlb_clear_slave(bond, slave, 0);
|
|
|
|
if (bond->alb_info.rlb_enabled) {
|
|
bond->alb_info.next_rx_slave = NULL;
|
|
rlb_clear_slave(bond, slave);
|
|
}
|
|
}
|
|
|
|
/* Caller must hold bond lock for read */
|
|
void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
|
|
{
|
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
|
|
|
|
if (link == BOND_LINK_DOWN) {
|
|
tlb_clear_slave(bond, slave, 0);
|
|
if (bond->alb_info.rlb_enabled) {
|
|
rlb_clear_slave(bond, slave);
|
|
}
|
|
} else if (link == BOND_LINK_UP) {
|
|
/* order a rebalance ASAP */
|
|
bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
|
|
if (bond->alb_info.rlb_enabled) {
|
|
bond->alb_info.rlb_rebalance = 1;
|
|
/* If the updelay module parameter is smaller than the
|
|
* forwarding delay of the switch the rebalance will
|
|
* not work because the rebalance arp replies will
|
|
* not be forwarded to the clients..
|
|
*/
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* bond_alb_handle_active_change - assign new curr_active_slave
|
|
* @bond: our bonding struct
|
|
* @new_slave: new slave to assign
|
|
*
|
|
* Set the bond->curr_active_slave to @new_slave and handle
|
|
* mac address swapping and promiscuity changes as needed.
|
|
*
|
|
* If new_slave is NULL, caller must hold curr_slave_lock or
|
|
* bond->lock for write.
|
|
*
|
|
* If new_slave is not NULL, caller must hold RTNL, bond->lock for
|
|
* read and curr_slave_lock for write. Processing here may sleep, so
|
|
* no other locks may be held.
|
|
*/
|
|
void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
|
|
__releases(&bond->curr_slave_lock)
|
|
__releases(&bond->lock)
|
|
__acquires(&bond->lock)
|
|
__acquires(&bond->curr_slave_lock)
|
|
{
|
|
struct slave *swap_slave;
|
|
|
|
if (bond->curr_active_slave == new_slave) {
|
|
return;
|
|
}
|
|
|
|
if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
|
|
dev_set_promiscuity(bond->curr_active_slave->dev, -1);
|
|
bond->alb_info.primary_is_promisc = 0;
|
|
bond->alb_info.rlb_promisc_timeout_counter = 0;
|
|
}
|
|
|
|
swap_slave = bond->curr_active_slave;
|
|
bond->curr_active_slave = new_slave;
|
|
|
|
if (!new_slave || (bond->slave_cnt == 0)) {
|
|
return;
|
|
}
|
|
|
|
/* set the new curr_active_slave to the bonds mac address
|
|
* i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
|
|
*/
|
|
if (!swap_slave)
|
|
swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
|
|
|
|
/*
|
|
* Arrange for swap_slave and new_slave to temporarily be
|
|
* ignored so we can mess with their MAC addresses without
|
|
* fear of interference from transmit activity.
|
|
*/
|
|
if (swap_slave) {
|
|
tlb_clear_slave(bond, swap_slave, 1);
|
|
}
|
|
tlb_clear_slave(bond, new_slave, 1);
|
|
|
|
write_unlock_bh(&bond->curr_slave_lock);
|
|
read_unlock(&bond->lock);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* curr_active_slave must be set before calling alb_swap_mac_addr */
|
|
if (swap_slave) {
|
|
/* swap mac address */
|
|
alb_swap_mac_addr(swap_slave, new_slave);
|
|
alb_fasten_mac_swap(bond, swap_slave, new_slave);
|
|
read_lock(&bond->lock);
|
|
} else {
|
|
/* set the new_slave to the bond mac address */
|
|
alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
|
|
read_lock(&bond->lock);
|
|
alb_send_learning_packets(new_slave, bond->dev->dev_addr);
|
|
}
|
|
|
|
write_lock_bh(&bond->curr_slave_lock);
|
|
}
|
|
|
|
/*
|
|
* Called with RTNL
|
|
*/
|
|
int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
|
|
__acquires(&bond->lock)
|
|
__releases(&bond->lock)
|
|
{
|
|
struct bonding *bond = netdev_priv(bond_dev);
|
|
struct sockaddr *sa = addr;
|
|
struct slave *swap_slave;
|
|
int res;
|
|
|
|
if (!is_valid_ether_addr(sa->sa_data)) {
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
res = alb_set_mac_address(bond, addr);
|
|
if (res) {
|
|
return res;
|
|
}
|
|
|
|
memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
|
|
|
|
/* If there is no curr_active_slave there is nothing else to do.
|
|
* Otherwise we'll need to pass the new address to it and handle
|
|
* duplications.
|
|
*/
|
|
if (!bond->curr_active_slave) {
|
|
return 0;
|
|
}
|
|
|
|
swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
|
|
|
|
if (swap_slave) {
|
|
alb_swap_mac_addr(swap_slave, bond->curr_active_slave);
|
|
alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
|
|
} else {
|
|
alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr);
|
|
|
|
read_lock(&bond->lock);
|
|
alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
|
|
if (bond->alb_info.rlb_enabled) {
|
|
/* inform clients mac address has changed */
|
|
rlb_req_update_slave_clients(bond, bond->curr_active_slave);
|
|
}
|
|
read_unlock(&bond->lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
|
|
{
|
|
if (bond->alb_info.current_alb_vlan &&
|
|
(bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
|
|
bond->alb_info.current_alb_vlan = NULL;
|
|
}
|
|
|
|
if (bond->alb_info.rlb_enabled) {
|
|
rlb_clear_vlan(bond, vlan_id);
|
|
}
|
|
}
|
|
|