diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/net/bonding/bond_alb.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/net/bonding/bond_alb.c | 1722 |
1 files changed, 1722 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/drivers/net/bonding/bond_alb.c b/ANDROID_3.4.5/drivers/net/bonding/bond_alb.c new file mode 100644 index 00000000..2e1f8066 --- /dev/null +++ b/ANDROID_3.4.5/drivers/net/bonding/bond_alb.c @@ -0,0 +1,1722 @@ +/* + * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called LICENSE. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/skbuff.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/pkt_sched.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/timer.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/if_bonding.h> +#include <linux/if_vlan.h> +#include <linux/in.h> +#include <net/ipx.h> +#include <net/arp.h> +#include <net/ipv6.h> +#include <asm/byteorder.h> +#include "bonding.h" +#include "bond_alb.h" + + + +#ifndef __long_aligned +#define __long_aligned __attribute__((aligned((sizeof(long))))) +#endif +static const u8 mac_bcast[ETH_ALEN] __long_aligned = { + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff +}; +static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { + 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 +}; +static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; + +#pragma pack(1) +struct learning_pkt { + u8 mac_dst[ETH_ALEN]; + u8 mac_src[ETH_ALEN]; + __be16 type; + u8 padding[ETH_ZLEN - ETH_HLEN]; +}; + +struct arp_pkt { + __be16 hw_addr_space; + __be16 prot_addr_space; + u8 hw_addr_len; + u8 prot_addr_len; + __be16 op_code; + u8 mac_src[ETH_ALEN]; /* sender hardware address */ + __be32 ip_src; /* sender IP address */ + u8 mac_dst[ETH_ALEN]; /* target hardware address */ + __be32 ip_dst; /* target IP address */ +}; +#pragma pack() + +static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) +{ + return (struct arp_pkt *)skb_network_header(skb); +} + +/* Forward declaration */ +static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); + +static inline u8 _simple_hash(const u8 *hash_start, int hash_size) +{ + int i; + u8 hash = 0; + + for (i = 0; i < hash_size; i++) { + hash ^= hash_start[i]; + } + + return hash; +} + +/*********************** tlb specific functions ***************************/ + +static inline void _lock_tx_hashtbl_bh(struct bonding *bond) +{ + spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); +} + +static inline void _unlock_tx_hashtbl_bh(struct bonding *bond) +{ + spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); +} + +static inline void _lock_tx_hashtbl(struct bonding *bond) +{ + spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); +} + +static inline void _unlock_tx_hashtbl(struct bonding *bond) +{ + spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); +} + +/* Caller must hold tx_hashtbl lock */ +static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) +{ + if (save_load) { + entry->load_history = 1 + entry->tx_bytes / + BOND_TLB_REBALANCE_INTERVAL; + entry->tx_bytes = 0; + } + + entry->tx_slave = NULL; + entry->next = TLB_NULL_INDEX; + entry->prev = TLB_NULL_INDEX; +} + +static inline void tlb_init_slave(struct slave *slave) +{ + SLAVE_TLB_INFO(slave).load = 0; + SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; +} + +/* Caller must hold bond lock for read, BH disabled */ +static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, + int save_load) +{ + struct tlb_client_info *tx_hash_table; + u32 index; + + /* clear slave from tx_hashtbl */ + tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; + + /* skip this if we've already freed the tx hash table */ + if (tx_hash_table) { + index = SLAVE_TLB_INFO(slave).head; + while (index != TLB_NULL_INDEX) { + u32 next_index = tx_hash_table[index].next; + tlb_init_table_entry(&tx_hash_table[index], save_load); + index = next_index; + } + } + + tlb_init_slave(slave); +} + +/* Caller must hold bond lock for read */ +static void tlb_clear_slave(struct bonding *bond, struct slave *slave, + int save_load) +{ + _lock_tx_hashtbl_bh(bond); + __tlb_clear_slave(bond, slave, save_load); + _unlock_tx_hashtbl_bh(bond); +} + +/* Must be called before starting the monitor timer */ +static int tlb_initialize(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); + struct tlb_client_info *new_hashtbl; + int i; + + new_hashtbl = kzalloc(size, GFP_KERNEL); + if (!new_hashtbl) + return -1; + + _lock_tx_hashtbl_bh(bond); + + bond_info->tx_hashtbl = new_hashtbl; + + for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { + tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); + } + + _unlock_tx_hashtbl_bh(bond); + + return 0; +} + +/* Must be called only after all slaves have been released */ +static void tlb_deinitialize(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + + _lock_tx_hashtbl_bh(bond); + + kfree(bond_info->tx_hashtbl); + bond_info->tx_hashtbl = NULL; + + _unlock_tx_hashtbl_bh(bond); +} + +static long long compute_gap(struct slave *slave) +{ + return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ + (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ +} + +/* Caller must hold bond lock for read */ +static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) +{ + struct slave *slave, *least_loaded; + long long max_gap; + int i; + + least_loaded = NULL; + max_gap = LLONG_MIN; + + /* Find the slave with the largest gap */ + bond_for_each_slave(bond, slave, i) { + if (SLAVE_IS_OK(slave)) { + long long gap = compute_gap(slave); + + if (max_gap < gap) { + least_loaded = slave; + max_gap = gap; + } + } + } + + return least_loaded; +} + +static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, + u32 skb_len) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct tlb_client_info *hash_table; + struct slave *assigned_slave; + + hash_table = bond_info->tx_hashtbl; + assigned_slave = hash_table[hash_index].tx_slave; + if (!assigned_slave) { + assigned_slave = tlb_get_least_loaded_slave(bond); + + if (assigned_slave) { + struct tlb_slave_info *slave_info = + &(SLAVE_TLB_INFO(assigned_slave)); + u32 next_index = slave_info->head; + + hash_table[hash_index].tx_slave = assigned_slave; + hash_table[hash_index].next = next_index; + hash_table[hash_index].prev = TLB_NULL_INDEX; + + if (next_index != TLB_NULL_INDEX) { + hash_table[next_index].prev = hash_index; + } + + slave_info->head = hash_index; + slave_info->load += + hash_table[hash_index].load_history; + } + } + + if (assigned_slave) { + hash_table[hash_index].tx_bytes += skb_len; + } + + return assigned_slave; +} + +/* Caller must hold bond lock for read */ +static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, + u32 skb_len) +{ + struct slave *tx_slave; + /* + * We don't need to disable softirq here, becase + * tlb_choose_channel() is only called by bond_alb_xmit() + * which already has softirq disabled. + */ + _lock_tx_hashtbl(bond); + tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); + _unlock_tx_hashtbl(bond); + return tx_slave; +} + +/*********************** rlb specific functions ***************************/ +static inline void _lock_rx_hashtbl_bh(struct bonding *bond) +{ + spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); +} + +static inline void _unlock_rx_hashtbl_bh(struct bonding *bond) +{ + spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); +} + +static inline void _lock_rx_hashtbl(struct bonding *bond) +{ + spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); +} + +static inline void _unlock_rx_hashtbl(struct bonding *bond) +{ + spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); +} + +/* when an ARP REPLY is received from a client update its info + * in the rx_hashtbl + */ +static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) +{ + 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 = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); + client_info = &(bond_info->rx_hashtbl[hash_index]); + + if ((client_info->assigned) && + (client_info->ip_src == arp->ip_dst) && + (client_info->ip_dst == arp->ip_src) && + (compare_ether_addr_64bits(client_info->mac_dst, arp->mac_src))) { + /* update the clients MAC address */ + memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); + client_info->ntt = 1; + bond_info->rx_ntt = 1; + } + + _unlock_rx_hashtbl_bh(bond); +} + +static int rlb_arp_recv(struct sk_buff *skb, struct bonding *bond, + struct slave *slave) +{ + struct arp_pkt *arp; + + if (skb->protocol != cpu_to_be16(ETH_P_ARP)) + goto out; + + arp = (struct arp_pkt *) skb->data; + if (!arp) { + pr_debug("Packet has no ARP data\n"); + goto out; + } + + if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) + goto out; + + if (skb->len < sizeof(struct arp_pkt)) { + pr_debug("Packet is too small to be an ARP\n"); + goto out; + } + + if (arp->op_code == htons(ARPOP_REPLY)) { + /* update rx hash table for this ARP */ + rlb_update_entry_from_arp(bond, arp); + pr_debug("Server received an ARP Reply from client\n"); + } +out: + return RX_HANDLER_ANOTHER; +} + +/* Caller must hold bond lock for read */ +static struct slave *rlb_next_rx_slave(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct slave *rx_slave, *slave, *start_at; + int i = 0; + + if (bond_info->next_rx_slave) { + start_at = bond_info->next_rx_slave; + } else { + start_at = bond->first_slave; + } + + rx_slave = NULL; + + bond_for_each_slave_from(bond, slave, i, start_at) { + if (SLAVE_IS_OK(slave)) { + if (!rx_slave) { + rx_slave = slave; + } else if (slave->speed > rx_slave->speed) { + rx_slave = slave; + } + } + } + + if (rx_slave) { + bond_info->next_rx_slave = rx_slave->next; + } + + return rx_slave; +} + +/* teach the switch the mac of a disabled slave + * on the primary for fault tolerance + * + * Caller must hold bond->curr_slave_lock for write or bond lock for write + */ +static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) +{ + if (!bond->curr_active_slave) { + return; + } + + if (!bond->alb_info.primary_is_promisc) { + if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) + bond->alb_info.primary_is_promisc = 1; + else + bond->alb_info.primary_is_promisc = 0; + } + + bond->alb_info.rlb_promisc_timeout_counter = 0; + + alb_send_learning_packets(bond->curr_active_slave, addr); +} + +/* slave being removed should not be active at this point + * + * Caller must hold bond lock for read + */ +static void rlb_clear_slave(struct bonding *bond, struct slave *slave) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *rx_hash_table; + u32 index, next_index; + + /* clear slave from rx_hashtbl */ + _lock_rx_hashtbl_bh(bond); + + rx_hash_table = bond_info->rx_hashtbl; + index = bond_info->rx_hashtbl_head; + for (; index != RLB_NULL_INDEX; index = next_index) { + next_index = rx_hash_table[index].next; + if (rx_hash_table[index].slave == slave) { + struct slave *assigned_slave = rlb_next_rx_slave(bond); + + if (assigned_slave) { + rx_hash_table[index].slave = assigned_slave; + if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst, + mac_bcast)) { + bond_info->rx_hashtbl[index].ntt = 1; + bond_info->rx_ntt = 1; + /* A slave has been removed from the + * table because it is either disabled + * or being released. We must retry the + * update to avoid clients from not + * being updated & disconnecting when + * there is stress + */ + bond_info->rlb_update_retry_counter = + RLB_UPDATE_RETRY; + } + } else { /* there is no active slave */ + rx_hash_table[index].slave = NULL; + } + } + } + + _unlock_rx_hashtbl_bh(bond); + + write_lock_bh(&bond->curr_slave_lock); + + if (slave != bond->curr_active_slave) { + rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); + } + + write_unlock_bh(&bond->curr_slave_lock); +} + +static void rlb_update_client(struct rlb_client_info *client_info) +{ + int i; + + if (!client_info->slave) { + return; + } + + for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { + struct sk_buff *skb; + + 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->dev->master->name); + continue; + } + + skb->dev = client_info->slave->dev; + + if (client_info->tag) { + skb = vlan_put_tag(skb, client_info->vlan_id); + if (!skb) { + pr_err("%s: Error: failed to insert VLAN tag\n", + client_info->slave->dev->master->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_head; + for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->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_head; + for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { + client_info = &(bond_info->rx_hashtbl[hash_index]); + + if ((client_info->slave == slave) && + compare_ether_addr_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_head; + for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->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) && + compare_ether_addr_64bits(client_info->slave->dev->dev_addr, + bond->dev->dev_addr) && + compare_ether_addr_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 (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) { + /* update mac address from arp */ + memcpy(client_info->mac_dst, arp->mac_dst, 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) { + 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); + client_info->slave = assigned_slave; + + if (compare_ether_addr_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_head; + bond_info->rx_hashtbl_head = hash_index; + client_info->next = prev_tbl_head; + if (prev_tbl_head != RLB_NULL_INDEX) { + bond_info->rx_hashtbl[prev_tbl_head].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; + + 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_head; + for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->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(struct rlb_client_info *entry) +{ + memset(entry, 0, sizeof(struct rlb_client_info)); + entry->next = RLB_NULL_INDEX; + entry->prev = RLB_NULL_INDEX; +} + +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_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_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_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].next; + u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; + + if (curr->tag && (curr->vlan_id == vlan_id)) { + if (curr_index == bond_info->rx_hashtbl_head) { + bond_info->rx_hashtbl_head = next_index; + } + if (prev_index != RLB_NULL_INDEX) { + bond_info->rx_hashtbl[prev_index].next = next_index; + } + if (next_index != RLB_NULL_INDEX) { + bond_info->rx_hashtbl[next_index].prev = prev_index; + } + + rlb_init_table_entry(curr); + } + + 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, 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", + dev->master->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 bonding *bond, 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; + + perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr, + slave->dev->dev_addr); + perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr, + bond->dev->dev_addr); + + if (perm_curr_diff && perm_bond_diff) { + struct slave *tmp_slave; + int i, found = 0; + + bond_for_each_slave(bond, tmp_slave, i) { + if (!compare_ether_addr_64bits(slave->perm_hwaddr, + tmp_slave->dev->dev_addr)) { + found = 1; + break; + } + } + + if (found) { + /* locking: needs RTNL and nothing else */ + alb_swap_mac_addr(bond, slave, tmp_slave); + alb_fasten_mac_swap(bond, slave, tmp_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. + * + * caller must hold the bond lock for write since the mac addresses are compared + * and may be swapped. + */ +static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) +{ + struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; + struct slave *has_bond_addr = bond->curr_active_slave; + int i, j, found = 0; + + 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 (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { + bond_for_each_slave(bond, tmp_slave1, i) { + if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr, + slave->dev->dev_addr)) { + found = 1; + break; + } + } + + if (!found) + 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. + */ + free_mac_slave = NULL; + + bond_for_each_slave(bond, tmp_slave1, i) { + found = 0; + bond_for_each_slave(bond, tmp_slave2, j) { + if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr, + tmp_slave2->dev->dev_addr)) { + found = 1; + break; + } + } + + if (!found) { + /* no slave has tmp_slave1's perm addr + * as its curr addr + */ + free_mac_slave = tmp_slave1; + break; + } + + if (!has_bond_addr) { + if (!compare_ether_addr_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 (!compare_ether_addr_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 (!compare_ether_addr_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 (!compare_ether_addr_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); + } + } + + if (res) { + /* no suitable interface, frame not sent */ + dev_kfree_skb(skb); + } + read_unlock(&bond->curr_slave_lock); + + 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; + } + + /* caller must hold the bond lock for write since the mac addresses + * are compared and may be swapped. + */ + read_lock(&bond->lock); + + res = alb_handle_addr_collision_on_attach(bond, slave); + + read_unlock(&bond->lock); + + 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; + int i; + + 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) { + struct slave *tmp_slave; + /* find slave that is holding the bond's mac address */ + bond_for_each_slave(bond, tmp_slave, i) { + if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr, + bond->dev->dev_addr)) { + swap_slave = tmp_slave; + break; + } + } + } + + /* + * 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(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); + } + + if (swap_slave) { + alb_fasten_mac_swap(bond, swap_slave, new_slave); + read_lock(&bond->lock); + } else { + 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 *slave, *swap_slave; + int res; + int i; + + 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 = NULL; + + bond_for_each_slave(bond, slave, i) { + if (!compare_ether_addr_64bits(slave->dev->dev_addr, + bond_dev->dev_addr)) { + swap_slave = slave; + break; + } + } + + if (swap_slave) { + alb_swap_mac_addr(bond, 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); + } +} + |