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1831 lines
49 KiB
1831 lines
49 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. |
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*/ |
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|
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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 <net/bonding.h> |
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#include <net/bond_alb.h> |
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|
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static const u8 mac_v6_allmcast[ETH_ALEN + 2] __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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|
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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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|
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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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|
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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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bool strict_match); |
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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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|
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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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|
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for (i = 0; i < hash_size; i++) |
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hash ^= hash_start[i]; |
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return hash; |
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} |
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|
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/*********************** tlb specific functions ***************************/ |
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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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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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|
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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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|
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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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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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spin_lock_bh(&bond->mode_lock); |
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__tlb_clear_slave(bond, slave, save_load); |
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spin_unlock_bh(&bond->mode_lock); |
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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 -ENOMEM; |
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spin_lock_bh(&bond->mode_lock); |
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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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spin_unlock_bh(&bond->mode_lock); |
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return 0; |
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} |
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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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spin_lock_bh(&bond->mode_lock); |
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kfree(bond_info->tx_hashtbl); |
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bond_info->tx_hashtbl = NULL; |
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spin_unlock_bh(&bond->mode_lock); |
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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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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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struct list_head *iter; |
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long long max_gap; |
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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_rcu(bond, slave, iter) { |
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if (bond_slave_can_tx(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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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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return assigned_slave; |
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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 slave *tx_slave; |
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/* We don't need to disable softirq here, because |
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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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spin_lock(&bond->mode_lock); |
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tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); |
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spin_unlock(&bond->mode_lock); |
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return tx_slave; |
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} |
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/*********************** rlb specific functions ***************************/ |
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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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spin_lock_bh(&bond->mode_lock); |
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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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ether_addr_copy(client_info->mac_dst, arp->mac_src); |
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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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spin_unlock_bh(&bond->mode_lock); |
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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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slave_dbg(bond->dev, slave->dev, "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 rcu_read_lock() */ |
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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 *before = NULL, *rx_slave = NULL, *slave; |
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struct list_head *iter; |
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bool found = false; |
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bond_for_each_slave_rcu(bond, slave, iter) { |
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if (!bond_slave_can_tx(slave)) |
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continue; |
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if (!found) { |
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if (!before || before->speed < slave->speed) |
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before = slave; |
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} else { |
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if (!rx_slave || rx_slave->speed < slave->speed) |
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rx_slave = slave; |
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} |
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if (slave == bond_info->rx_slave) |
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found = true; |
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} |
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/* we didn't find anything after the current or we have something |
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* better before and up to the current slave |
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*/ |
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if (!rx_slave || (before && rx_slave->speed < before->speed)) |
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rx_slave = before; |
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if (rx_slave) |
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bond_info->rx_slave = rx_slave; |
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return rx_slave; |
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} |
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/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */ |
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static struct slave *rlb_next_rx_slave(struct bonding *bond) |
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{ |
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struct slave *rx_slave; |
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ASSERT_RTNL(); |
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rcu_read_lock(); |
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rx_slave = __rlb_next_rx_slave(bond); |
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rcu_read_unlock(); |
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return rx_slave; |
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} |
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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 RTNL |
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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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struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
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|
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if (!curr_active) |
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return; |
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if (!bond->alb_info.primary_is_promisc) { |
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if (!dev_set_promiscuity(curr_active->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(curr_active, addr, true); |
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} |
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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 rtnl. |
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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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|
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/* clear slave from rx_hashtbl */ |
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spin_lock_bh(&bond->mode_lock); |
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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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|
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if (assigned_slave) { |
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rx_hash_table[index].slave = assigned_slave; |
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if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) { |
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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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spin_unlock_bh(&bond->mode_lock); |
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|
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if (slave != rtnl_dereference(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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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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|
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if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst)) |
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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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|
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skb = arp_create(ARPOP_REPLY, ETH_P_ARP, |
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client_info->ip_dst, |
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client_info->slave->dev, |
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client_info->ip_src, |
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client_info->mac_dst, |
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client_info->slave->dev->dev_addr, |
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client_info->mac_dst); |
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if (!skb) { |
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slave_err(client_info->slave->bond->dev, |
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client_info->slave->dev, |
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"failed to create an ARP packet\n"); |
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continue; |
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} |
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|
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skb->dev = client_info->slave->dev; |
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|
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if (client_info->vlan_id) { |
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__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), |
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client_info->vlan_id); |
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} |
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|
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arp_xmit(skb); |
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} |
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} |
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|
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/* sends ARP REPLIES that update the clients that need updating */ |
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static void rlb_update_rx_clients(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 rlb_client_info *client_info; |
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u32 hash_index; |
|
|
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spin_lock_bh(&bond->mode_lock); |
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|
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hash_index = bond_info->rx_hashtbl_used_head; |
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for (; hash_index != RLB_NULL_INDEX; |
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hash_index = client_info->used_next) { |
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client_info = &(bond_info->rx_hashtbl[hash_index]); |
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if (client_info->ntt) { |
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rlb_update_client(client_info); |
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if (bond_info->rlb_update_retry_counter == 0) |
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client_info->ntt = 0; |
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} |
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} |
|
|
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/* do not update the entries again until this counter is zero so that |
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* not to confuse the clients. |
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*/ |
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bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; |
|
|
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spin_unlock_bh(&bond->mode_lock); |
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} |
|
|
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/* The slave was assigned a new mac address - update the clients */ |
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static void rlb_req_update_slave_clients(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 *client_info; |
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int ntt = 0; |
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u32 hash_index; |
|
|
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spin_lock_bh(&bond->mode_lock); |
|
|
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hash_index = bond_info->rx_hashtbl_used_head; |
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for (; hash_index != RLB_NULL_INDEX; |
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hash_index = client_info->used_next) { |
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client_info = &(bond_info->rx_hashtbl[hash_index]); |
|
|
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if ((client_info->slave == slave) && |
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is_valid_ether_addr(client_info->mac_dst)) { |
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client_info->ntt = 1; |
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ntt = 1; |
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} |
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} |
|
|
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/* update the team's flag only after the whole iteration */ |
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if (ntt) { |
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bond_info->rx_ntt = 1; |
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/* fasten the change */ |
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bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
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} |
|
|
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spin_unlock_bh(&bond->mode_lock); |
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} |
|
|
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/* mark all clients using src_ip to be updated */ |
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static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
|
{ |
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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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spin_lock(&bond->mode_lock); |
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|
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hash_index = bond_info->rx_hashtbl_used_head; |
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for (; hash_index != RLB_NULL_INDEX; |
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hash_index = client_info->used_next) { |
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client_info = &(bond_info->rx_hashtbl[hash_index]); |
|
|
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if (!client_info->slave) { |
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netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); |
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continue; |
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} |
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/* update all clients using this src_ip, that are not assigned |
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* to the team's address (curr_active_slave) and have a known |
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* unicast mac address. |
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*/ |
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if ((client_info->ip_src == src_ip) && |
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!ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
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bond->dev->dev_addr) && |
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is_valid_ether_addr(client_info->mac_dst)) { |
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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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} |
|
|
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spin_unlock(&bond->mode_lock); |
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} |
|
|
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static struct slave *rlb_choose_channel(struct sk_buff *skb, |
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struct bonding *bond, |
|
const struct arp_pkt *arp) |
|
{ |
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struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
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struct slave *assigned_slave, *curr_active_slave; |
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struct rlb_client_info *client_info; |
|
u32 hash_index = 0; |
|
|
|
spin_lock(&bond->mode_lock); |
|
|
|
curr_active_slave = rcu_dereference(bond->curr_active_slave); |
|
|
|
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 (!is_broadcast_ether_addr(arp->mac_dst)) { |
|
/* update mac address from arp */ |
|
ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
|
} |
|
ether_addr_copy(client_info->mac_src, arp->mac_src); |
|
|
|
assigned_slave = client_info->slave; |
|
if (assigned_slave) { |
|
spin_unlock(&bond->mode_lock); |
|
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 (curr_active_slave && |
|
client_info->slave != curr_active_slave) { |
|
client_info->slave = 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 requests. |
|
* will be updated with clients actual unicast mac address |
|
* upon receiving an arp reply. |
|
*/ |
|
ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
|
ether_addr_copy(client_info->mac_src, arp->mac_src); |
|
client_info->slave = assigned_slave; |
|
|
|
if (is_valid_ether_addr(client_info->mac_dst)) { |
|
client_info->ntt = 1; |
|
bond->alb_info.rx_ntt = 1; |
|
} else { |
|
client_info->ntt = 0; |
|
} |
|
|
|
if (vlan_get_tag(skb, &client_info->vlan_id)) |
|
client_info->vlan_id = 0; |
|
|
|
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; |
|
} |
|
} |
|
|
|
spin_unlock(&bond->mode_lock); |
|
|
|
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 slave *tx_slave = NULL; |
|
struct arp_pkt *arp; |
|
|
|
if (!pskb_network_may_pull(skb, sizeof(*arp))) |
|
return NULL; |
|
arp = (struct arp_pkt *)skb_network_header(skb); |
|
|
|
/* Don't modify or load balance ARPs that do not originate locally |
|
* (e.g.,arrive via a bridge). |
|
*/ |
|
if (!bond_slave_has_mac_rx(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, arp); |
|
if (tx_slave) |
|
bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr, |
|
tx_slave->dev->addr_len); |
|
netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n", |
|
tx_slave ? tx_slave->dev->name : "NULL"); |
|
} 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. |
|
*/ |
|
tx_slave = rlb_choose_channel(skb, bond, arp); |
|
|
|
/* 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); |
|
netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n", |
|
tx_slave ? tx_slave->dev->name : "NULL"); |
|
} |
|
|
|
return tx_slave; |
|
} |
|
|
|
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; |
|
|
|
spin_lock_bh(&bond->mode_lock); |
|
|
|
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; |
|
if (!is_zero_ether_addr(client_info->mac_dst)) { |
|
client_info->ntt = 1; |
|
ntt = 1; |
|
} |
|
} |
|
} |
|
|
|
/* update the team's flag only after the whole iteration */ |
|
if (ntt) |
|
bond_info->rx_ntt = 1; |
|
spin_unlock_bh(&bond->mode_lock); |
|
} |
|
|
|
/* Caller must hold mode_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->vlan_id = 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; |
|
|
|
spin_lock_bh(&bond->mode_lock); |
|
|
|
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; |
|
} |
|
spin_unlock_bh(&bond->mode_lock); |
|
} |
|
|
|
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; |
|
|
|
spin_lock_bh(&bond->mode_lock); |
|
|
|
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); |
|
|
|
spin_unlock_bh(&bond->mode_lock); |
|
|
|
/* 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)); |
|
|
|
spin_lock_bh(&bond->mode_lock); |
|
|
|
kfree(bond_info->rx_hashtbl); |
|
bond_info->rx_hashtbl = NULL; |
|
bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
|
|
|
spin_unlock_bh(&bond->mode_lock); |
|
} |
|
|
|
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; |
|
|
|
spin_lock_bh(&bond->mode_lock); |
|
|
|
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->vlan_id == vlan_id) |
|
rlb_delete_table_entry(bond, curr_index); |
|
|
|
curr_index = next_index; |
|
} |
|
|
|
spin_unlock_bh(&bond->mode_lock); |
|
} |
|
|
|
/*********************** tlb/rlb shared functions *********************/ |
|
|
|
static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
|
__be16 vlan_proto, u16 vid) |
|
{ |
|
struct learning_pkt pkt; |
|
struct sk_buff *skb; |
|
int size = sizeof(struct learning_pkt); |
|
|
|
memset(&pkt, 0, size); |
|
ether_addr_copy(pkt.mac_dst, mac_addr); |
|
ether_addr_copy(pkt.mac_src, mac_addr); |
|
pkt.type = cpu_to_be16(ETH_P_LOOPBACK); |
|
|
|
skb = dev_alloc_skb(size); |
|
if (!skb) |
|
return; |
|
|
|
skb_put_data(skb, &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; |
|
|
|
slave_dbg(slave->bond->dev, slave->dev, |
|
"Send learning packet: mac %pM vlan %d\n", mac_addr, vid); |
|
|
|
if (vid) |
|
__vlan_hwaccel_put_tag(skb, vlan_proto, vid); |
|
|
|
dev_queue_xmit(skb); |
|
} |
|
|
|
struct alb_walk_data { |
|
struct bonding *bond; |
|
struct slave *slave; |
|
u8 *mac_addr; |
|
bool strict_match; |
|
}; |
|
|
|
static int alb_upper_dev_walk(struct net_device *upper, |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct alb_walk_data *data = (struct alb_walk_data *)priv->data; |
|
bool strict_match = data->strict_match; |
|
struct bonding *bond = data->bond; |
|
struct slave *slave = data->slave; |
|
u8 *mac_addr = data->mac_addr; |
|
struct bond_vlan_tag *tags; |
|
|
|
if (is_vlan_dev(upper) && |
|
bond->dev->lower_level == upper->lower_level - 1) { |
|
if (upper->addr_assign_type == NET_ADDR_STOLEN) { |
|
alb_send_lp_vid(slave, mac_addr, |
|
vlan_dev_vlan_proto(upper), |
|
vlan_dev_vlan_id(upper)); |
|
} else { |
|
alb_send_lp_vid(slave, upper->dev_addr, |
|
vlan_dev_vlan_proto(upper), |
|
vlan_dev_vlan_id(upper)); |
|
} |
|
} |
|
|
|
/* If this is a macvlan device, then only send updates |
|
* when strict_match is turned off. |
|
*/ |
|
if (netif_is_macvlan(upper) && !strict_match) { |
|
tags = bond_verify_device_path(bond->dev, upper, 0); |
|
if (IS_ERR_OR_NULL(tags)) |
|
BUG(); |
|
alb_send_lp_vid(slave, upper->dev_addr, |
|
tags[0].vlan_proto, tags[0].vlan_id); |
|
kfree(tags); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
|
bool strict_match) |
|
{ |
|
struct bonding *bond = bond_get_bond_by_slave(slave); |
|
struct netdev_nested_priv priv; |
|
struct alb_walk_data data = { |
|
.strict_match = strict_match, |
|
.mac_addr = mac_addr, |
|
.slave = slave, |
|
.bond = bond, |
|
}; |
|
|
|
priv.data = (void *)&data; |
|
/* send untagged */ |
|
alb_send_lp_vid(slave, mac_addr, 0, 0); |
|
|
|
/* loop through all devices and see if we need to send a packet |
|
* for that device. |
|
*/ |
|
rcu_read_lock(); |
|
netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &priv); |
|
rcu_read_unlock(); |
|
} |
|
|
|
static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], |
|
unsigned int len) |
|
{ |
|
struct net_device *dev = slave->dev; |
|
struct sockaddr_storage ss; |
|
|
|
if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { |
|
memcpy(dev->dev_addr, 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(ss.__data, addr, len); |
|
ss.ss_family = dev->type; |
|
if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) { |
|
slave_err(slave->bond->dev, dev, "dev_set_mac_address on slave failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n"); |
|
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[MAX_ADDR_LEN]; |
|
|
|
bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr, |
|
slave1->dev->addr_len); |
|
alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, |
|
slave2->dev->addr_len); |
|
alb_set_slave_mac_addr(slave2, tmp_mac_addr, |
|
slave1->dev->addr_len); |
|
|
|
} |
|
|
|
/* 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 = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); |
|
struct slave *disabled_slave = NULL; |
|
|
|
ASSERT_RTNL(); |
|
|
|
/* fasten the change in the switch */ |
|
if (bond_slave_can_tx(slave1)) { |
|
alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); |
|
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 (bond_slave_can_tx(slave2)) { |
|
alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); |
|
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 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) { |
|
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 *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); |
|
struct slave *tmp_slave1, *free_mac_slave = NULL; |
|
struct list_head *iter; |
|
|
|
if (!bond_has_slaves(bond)) { |
|
/* 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, |
|
bond->dev->addr_len); |
|
} |
|
|
|
/* 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, iter) { |
|
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, |
|
free_mac_slave->dev->addr_len); |
|
|
|
slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n", |
|
free_mac_slave->dev->name); |
|
|
|
} else if (has_bond_addr) { |
|
slave_err(bond->dev, slave->dev, "the slave hw address 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"); |
|
return -EFAULT; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* alb_set_mac_address |
|
* @bond: bonding we're working on |
|
* @addr: MAC address to set |
|
* |
|
* 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 slave *slave, *rollback_slave; |
|
struct list_head *iter; |
|
struct sockaddr_storage ss; |
|
char tmp_addr[MAX_ADDR_LEN]; |
|
int res; |
|
|
|
if (bond->alb_info.rlb_enabled) |
|
return 0; |
|
|
|
bond_for_each_slave(bond, slave, iter) { |
|
/* save net_device's current hw address */ |
|
bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr, |
|
slave->dev->addr_len); |
|
|
|
res = dev_set_mac_address(slave->dev, addr, NULL); |
|
|
|
/* restore net_device's hw address */ |
|
bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr, |
|
slave->dev->addr_len); |
|
|
|
if (res) |
|
goto unwind; |
|
} |
|
|
|
return 0; |
|
|
|
unwind: |
|
memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len); |
|
ss.ss_family = bond->dev->type; |
|
|
|
/* unwind from head to the slave that failed */ |
|
bond_for_each_slave(bond, rollback_slave, iter) { |
|
if (rollback_slave == slave) |
|
break; |
|
bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr, |
|
rollback_slave->dev->addr_len); |
|
dev_set_mac_address(rollback_slave->dev, |
|
(struct sockaddr *)&ss, NULL); |
|
bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr, |
|
rollback_slave->dev->addr_len); |
|
} |
|
|
|
return res; |
|
} |
|
|
|
/************************ exported alb functions ************************/ |
|
|
|
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; |
|
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); |
|
} |
|
|
|
static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, |
|
struct slave *tx_slave) |
|
{ |
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
|
struct ethhdr *eth_data = eth_hdr(skb); |
|
|
|
if (!tx_slave) { |
|
/* unbalanced or unassigned, send through primary */ |
|
tx_slave = rcu_dereference(bond->curr_active_slave); |
|
if (bond->params.tlb_dynamic_lb) |
|
bond_info->unbalanced_load += skb->len; |
|
} |
|
|
|
if (tx_slave && bond_slave_can_tx(tx_slave)) { |
|
if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { |
|
ether_addr_copy(eth_data->h_source, |
|
tx_slave->dev->dev_addr); |
|
} |
|
|
|
return bond_dev_queue_xmit(bond, skb, tx_slave->dev); |
|
} |
|
|
|
if (tx_slave && bond->params.tlb_dynamic_lb) { |
|
spin_lock(&bond->mode_lock); |
|
__tlb_clear_slave(bond, tx_slave, 0); |
|
spin_unlock(&bond->mode_lock); |
|
} |
|
|
|
/* no suitable interface, frame not sent */ |
|
return bond_tx_drop(bond->dev, skb); |
|
} |
|
|
|
struct slave *bond_xmit_tlb_slave_get(struct bonding *bond, |
|
struct sk_buff *skb) |
|
{ |
|
struct slave *tx_slave = NULL; |
|
struct ethhdr *eth_data; |
|
u32 hash_index; |
|
|
|
skb_reset_mac_header(skb); |
|
eth_data = eth_hdr(skb); |
|
|
|
/* Do not TX balance any multicast or broadcast */ |
|
if (!is_multicast_ether_addr(eth_data->h_dest)) { |
|
switch (skb->protocol) { |
|
case htons(ETH_P_IP): |
|
case htons(ETH_P_IPX): |
|
/* In case of IPX, it will falback to L2 hash */ |
|
case htons(ETH_P_IPV6): |
|
hash_index = bond_xmit_hash(bond, skb); |
|
if (bond->params.tlb_dynamic_lb) { |
|
tx_slave = tlb_choose_channel(bond, |
|
hash_index & 0xFF, |
|
skb->len); |
|
} else { |
|
struct bond_up_slave *slaves; |
|
unsigned int count; |
|
|
|
slaves = rcu_dereference(bond->usable_slaves); |
|
count = slaves ? READ_ONCE(slaves->count) : 0; |
|
if (likely(count)) |
|
tx_slave = slaves->arr[hash_index % |
|
count]; |
|
} |
|
break; |
|
} |
|
} |
|
return tx_slave; |
|
} |
|
|
|
netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
|
{ |
|
struct bonding *bond = netdev_priv(bond_dev); |
|
struct slave *tx_slave; |
|
|
|
tx_slave = bond_xmit_tlb_slave_get(bond, skb); |
|
return bond_do_alb_xmit(skb, bond, tx_slave); |
|
} |
|
|
|
struct slave *bond_xmit_alb_slave_get(struct bonding *bond, |
|
struct sk_buff *skb) |
|
{ |
|
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
|
static const __be32 ip_bcast = htonl(0xffffffff); |
|
struct slave *tx_slave = NULL; |
|
const u8 *hash_start = NULL; |
|
bool do_tx_balance = true; |
|
struct ethhdr *eth_data; |
|
u32 hash_index = 0; |
|
int hash_size = 0; |
|
|
|
skb_reset_mac_header(skb); |
|
eth_data = eth_hdr(skb); |
|
|
|
switch (ntohs(skb->protocol)) { |
|
case ETH_P_IP: { |
|
const struct iphdr *iph; |
|
|
|
if (is_broadcast_ether_addr(eth_data->h_dest) || |
|
!pskb_network_may_pull(skb, sizeof(*iph))) { |
|
do_tx_balance = false; |
|
break; |
|
} |
|
iph = ip_hdr(skb); |
|
if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) { |
|
do_tx_balance = false; |
|
break; |
|
} |
|
hash_start = (char *)&(iph->daddr); |
|
hash_size = sizeof(iph->daddr); |
|
break; |
|
} |
|
case ETH_P_IPV6: { |
|
const struct ipv6hdr *ip6hdr; |
|
|
|
/* IPv6 doesn't really use broadcast mac address, but leave |
|
* that here just in case. |
|
*/ |
|
if (is_broadcast_ether_addr(eth_data->h_dest)) { |
|
do_tx_balance = false; |
|
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 = false; |
|
break; |
|
} |
|
|
|
if (!pskb_network_may_pull(skb, sizeof(*ip6hdr))) { |
|
do_tx_balance = false; |
|
break; |
|
} |
|
/* Additionally, 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 = false; |
|
break; |
|
} |
|
|
|
hash_start = (char *)&ip6hdr->daddr; |
|
hash_size = sizeof(ip6hdr->daddr); |
|
break; |
|
} |
|
case ETH_P_IPX: { |
|
const struct ipxhdr *ipxhdr; |
|
|
|
if (pskb_network_may_pull(skb, sizeof(*ipxhdr))) { |
|
do_tx_balance = false; |
|
break; |
|
} |
|
ipxhdr = (struct ipxhdr *)skb_network_header(skb); |
|
|
|
if (ipxhdr->ipx_checksum != IPX_NO_CHECKSUM) { |
|
/* something is wrong with this packet */ |
|
do_tx_balance = false; |
|
break; |
|
} |
|
|
|
if (ipxhdr->ipx_type != IPX_TYPE_NCP) { |
|
/* The only protocol worth balancing in |
|
* this family since it has an "ARP" like |
|
* mechanism |
|
*/ |
|
do_tx_balance = false; |
|
break; |
|
} |
|
|
|
eth_data = eth_hdr(skb); |
|
hash_start = (char *)eth_data->h_dest; |
|
hash_size = ETH_ALEN; |
|
break; |
|
} |
|
case ETH_P_ARP: |
|
do_tx_balance = false; |
|
if (bond_info->rlb_enabled) |
|
tx_slave = rlb_arp_xmit(skb, bond); |
|
break; |
|
default: |
|
do_tx_balance = false; |
|
break; |
|
} |
|
|
|
if (do_tx_balance) { |
|
if (bond->params.tlb_dynamic_lb) { |
|
hash_index = _simple_hash(hash_start, hash_size); |
|
tx_slave = tlb_choose_channel(bond, hash_index, skb->len); |
|
} else { |
|
/* |
|
* do_tx_balance means we are free to select the tx_slave |
|
* So we do exactly what tlb would do for hash selection |
|
*/ |
|
|
|
struct bond_up_slave *slaves; |
|
unsigned int count; |
|
|
|
slaves = rcu_dereference(bond->usable_slaves); |
|
count = slaves ? READ_ONCE(slaves->count) : 0; |
|
if (likely(count)) |
|
tx_slave = slaves->arr[bond_xmit_hash(bond, skb) % |
|
count]; |
|
} |
|
} |
|
return tx_slave; |
|
} |
|
|
|
netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
|
{ |
|
struct bonding *bond = netdev_priv(bond_dev); |
|
struct slave *tx_slave = NULL; |
|
|
|
tx_slave = bond_xmit_alb_slave_get(bond, skb); |
|
return bond_do_alb_xmit(skb, bond, tx_slave); |
|
} |
|
|
|
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 list_head *iter; |
|
struct slave *slave; |
|
|
|
if (!bond_has_slaves(bond)) { |
|
bond_info->tx_rebalance_counter = 0; |
|
bond_info->lp_counter = 0; |
|
goto re_arm; |
|
} |
|
|
|
rcu_read_lock(); |
|
|
|
bond_info->tx_rebalance_counter++; |
|
bond_info->lp_counter++; |
|
|
|
/* send learning packets */ |
|
if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
|
bool strict_match; |
|
|
|
bond_for_each_slave_rcu(bond, slave, iter) { |
|
/* If updating current_active, use all currently |
|
* user mac addresses (!strict_match). Otherwise, only |
|
* use mac of the slave device. |
|
* In RLB mode, we always use strict matches. |
|
*/ |
|
strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || |
|
bond_info->rlb_enabled); |
|
alb_send_learning_packets(slave, slave->dev->dev_addr, |
|
strict_match); |
|
} |
|
bond_info->lp_counter = 0; |
|
} |
|
|
|
/* rebalance tx traffic */ |
|
if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { |
|
bond_for_each_slave_rcu(bond, slave, iter) { |
|
tlb_clear_slave(bond, slave, 1); |
|
if (slave == rcu_access_pointer(bond->curr_active_slave)) { |
|
SLAVE_TLB_INFO(slave).load = |
|
bond_info->unbalanced_load / |
|
BOND_TLB_REBALANCE_INTERVAL; |
|
bond_info->unbalanced_load = 0; |
|
} |
|
} |
|
bond_info->tx_rebalance_counter = 0; |
|
} |
|
|
|
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. |
|
*/ |
|
rcu_read_unlock(); |
|
if (!rtnl_trylock()) |
|
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(rtnl_dereference(bond->curr_active_slave)->dev, |
|
-1); |
|
bond_info->primary_is_promisc = 0; |
|
|
|
rtnl_unlock(); |
|
rcu_read_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; |
|
} |
|
} |
|
} |
|
rcu_read_unlock(); |
|
re_arm: |
|
queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
|
} |
|
|
|
/* 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, |
|
slave->dev->addr_len); |
|
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_has_slaves(bond)) |
|
alb_change_hw_addr_on_detach(bond, slave); |
|
|
|
tlb_clear_slave(bond, slave, 0); |
|
|
|
if (bond->alb_info.rlb_enabled) { |
|
bond->alb_info.rx_slave = NULL; |
|
rlb_clear_slave(bond, slave); |
|
} |
|
|
|
} |
|
|
|
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.. |
|
*/ |
|
} |
|
} |
|
|
|
if (bond_is_nondyn_tlb(bond)) { |
|
if (bond_update_slave_arr(bond, NULL)) |
|
pr_err("Failed to build slave-array for TLB mode.\n"); |
|
} |
|
} |
|
|
|
/** |
|
* 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. |
|
* |
|
* Caller must hold RTNL |
|
*/ |
|
void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) |
|
{ |
|
struct slave *swap_slave; |
|
struct slave *curr_active; |
|
|
|
curr_active = rtnl_dereference(bond->curr_active_slave); |
|
if (curr_active == new_slave) |
|
return; |
|
|
|
if (curr_active && bond->alb_info.primary_is_promisc) { |
|
dev_set_promiscuity(curr_active->dev, -1); |
|
bond->alb_info.primary_is_promisc = 0; |
|
bond->alb_info.rlb_promisc_timeout_counter = 0; |
|
} |
|
|
|
swap_slave = curr_active; |
|
rcu_assign_pointer(bond->curr_active_slave, new_slave); |
|
|
|
if (!new_slave || !bond_has_slaves(bond)) |
|
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); |
|
|
|
/* in TLB mode, the slave might flip down/up with the old dev_addr, |
|
* and thus filter bond->dev_addr's packets, so force bond's mac |
|
*/ |
|
if (BOND_MODE(bond) == BOND_MODE_TLB) { |
|
struct sockaddr_storage ss; |
|
u8 tmp_addr[MAX_ADDR_LEN]; |
|
|
|
bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr, |
|
new_slave->dev->addr_len); |
|
|
|
bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, |
|
bond->dev->addr_len); |
|
ss.ss_family = bond->dev->type; |
|
/* we don't care if it can't change its mac, best effort */ |
|
dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss, |
|
NULL); |
|
|
|
bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr, |
|
new_slave->dev->addr_len); |
|
} |
|
|
|
/* 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); |
|
} else { |
|
/* set the new_slave to the bond mac address */ |
|
alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, |
|
bond->dev->addr_len); |
|
alb_send_learning_packets(new_slave, bond->dev->dev_addr, |
|
false); |
|
} |
|
} |
|
|
|
/* Called with RTNL */ |
|
int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
|
{ |
|
struct bonding *bond = netdev_priv(bond_dev); |
|
struct sockaddr_storage *ss = addr; |
|
struct slave *curr_active; |
|
struct slave *swap_slave; |
|
int res; |
|
|
|
if (!is_valid_ether_addr(ss->__data)) |
|
return -EADDRNOTAVAIL; |
|
|
|
res = alb_set_mac_address(bond, addr); |
|
if (res) |
|
return res; |
|
|
|
bond_hw_addr_copy(bond_dev->dev_addr, ss->__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. |
|
*/ |
|
curr_active = rtnl_dereference(bond->curr_active_slave); |
|
if (!curr_active) |
|
return 0; |
|
|
|
swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
|
|
|
if (swap_slave) { |
|
alb_swap_mac_addr(swap_slave, curr_active); |
|
alb_fasten_mac_swap(bond, swap_slave, curr_active); |
|
} else { |
|
alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr, |
|
bond_dev->addr_len); |
|
|
|
alb_send_learning_packets(curr_active, |
|
bond_dev->dev_addr, false); |
|
if (bond->alb_info.rlb_enabled) { |
|
/* inform clients mac address has changed */ |
|
rlb_req_update_slave_clients(bond, curr_active); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) |
|
{ |
|
if (bond->alb_info.rlb_enabled) |
|
rlb_clear_vlan(bond, vlan_id); |
|
} |
|
|
|
|