Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
new file mode 100644
index 0000000..5ce606d
--- /dev/null
+++ b/drivers/net/bonding/bond_alb.c
@@ -0,0 +1,1696 @@
+/*
+ * 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.
+ *
+ *
+ * Changes:
+ *
+ * 2003/06/25 - Shmulik Hen <shmulik.hen at intel dot com>
+ * - Fixed signed/unsigned calculation errors that caused load sharing
+ * to collapse to one slave under very heavy UDP Tx stress.
+ *
+ * 2003/08/06 - Amir Noam <amir.noam at intel dot com>
+ * - Add support for setting bond's MAC address with special
+ * handling required for ALB/TLB.
+ *
+ * 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
+ * - Code cleanup and style changes
+ *
+ * 2003/12/30 - Amir Noam <amir.noam at intel dot com>
+ * - Fixed: Cannot remove and re-enslave the original active slave.
+ *
+ * 2004/01/14 - Shmulik Hen <shmulik.hen at intel dot com>
+ * - Add capability to tag self generated packets in ALB/TLB modes.
+ */
+
+//#define BONDING_DEBUG 1
+
+#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 <asm/byteorder.h>
+#include "bonding.h"
+#include "bond_alb.h"
+
+
+#define ALB_TIMER_TICKS_PER_SEC 10 /* should be a divisor of HZ */
+#define BOND_TLB_REBALANCE_INTERVAL 10 /* In seconds, periodic re-balancing.
+ * Used for division - never set
+ * to zero !!!
+ */
+#define BOND_ALB_LP_INTERVAL 1 /* In seconds, periodic send of
+ * learning packets to the switch
+ */
+
+#define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \
+ * ALB_TIMER_TICKS_PER_SEC)
+
+#define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \
+ * ALB_TIMER_TICKS_PER_SEC)
+
+#define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table.
+ * Note that this value MUST NOT be smaller
+ * because the key hash table is BYTE wide !
+ */
+
+
+#define TLB_NULL_INDEX 0xffffffff
+#define MAX_LP_BURST 3
+
+/* rlb defs */
+#define RLB_HASH_TABLE_SIZE 256
+#define RLB_NULL_INDEX 0xffffffff
+#define RLB_UPDATE_DELAY 2*ALB_TIMER_TICKS_PER_SEC /* 2 seconds */
+#define RLB_ARP_BURST_SIZE 2
+#define RLB_UPDATE_RETRY 3 /* 3-ticks - must be smaller than the rlb
+ * rebalance interval (5 min).
+ */
+/* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is
+ * promiscuous after failover
+ */
+#define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC
+
+static const u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
+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];
+ u16 type;
+ u8 padding[ETH_ZLEN - ETH_HLEN];
+};
+
+struct arp_pkt {
+ u16 hw_addr_space;
+ u16 prot_addr_space;
+ u8 hw_addr_len;
+ u8 prot_addr_len;
+ u16 op_code;
+ u8 mac_src[ETH_ALEN]; /* sender hardware address */
+ u32 ip_src; /* sender IP address */
+ u8 mac_dst[ETH_ALEN]; /* target hardware address */
+ u32 ip_dst; /* target IP address */
+};
+#pragma pack()
+
+/* Forward declaration */
+static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
+
+static inline u8 _simple_hash(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(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 */
+static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
+{
+ struct tlb_client_info *tx_hash_table;
+ u32 index;
+
+ _lock_tx_hashtbl(bond);
+
+ /* clear slave from tx_hashtbl */
+ tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
+
+ 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;
+ }
+
+ _unlock_tx_hashtbl(bond);
+
+ tlb_init_slave(slave);
+}
+
+/* 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);
+ int i;
+
+ spin_lock_init(&(bond_info->tx_hashtbl_lock));
+
+ _lock_tx_hashtbl(bond);
+
+ bond_info->tx_hashtbl = kmalloc(size, GFP_KERNEL);
+ if (!bond_info->tx_hashtbl) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: %s: Failed to allocate TLB hash table\n",
+ bond->dev->name);
+ _unlock_tx_hashtbl(bond);
+ return -1;
+ }
+
+ memset(bond_info->tx_hashtbl, 0, size);
+
+ for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
+ tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1);
+ }
+
+ _unlock_tx_hashtbl(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(bond);
+
+ kfree(bond_info->tx_hashtbl);
+ bond_info->tx_hashtbl = NULL;
+
+ _unlock_tx_hashtbl(bond);
+}
+
+/* Caller must hold bond lock for read */
+static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
+{
+ struct slave *slave, *least_loaded;
+ s64 max_gap;
+ int i, found = 0;
+
+ /* Find the first enabled slave */
+ bond_for_each_slave(bond, slave, i) {
+ if (SLAVE_IS_OK(slave)) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ return NULL;
+ }
+
+ least_loaded = slave;
+ max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */
+ (s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
+
+ /* Find the slave with the largest gap */
+ bond_for_each_slave_from(bond, slave, i, least_loaded) {
+ if (SLAVE_IS_OK(slave)) {
+ s64 gap = (s64)(slave->speed << 20) -
+ (s64)(SLAVE_TLB_INFO(slave).load << 3);
+ if (max_gap < gap) {
+ least_loaded = slave;
+ max_gap = gap;
+ }
+ }
+ }
+
+ return least_loaded;
+}
+
+/* Caller must hold bond lock for read */
+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;
+
+ _lock_tx_hashtbl(bond);
+
+ 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;
+ }
+
+ _unlock_tx_hashtbl(bond);
+
+ return assigned_slave;
+}
+
+/*********************** rlb specific functions ***************************/
+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(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)) {
+ /* 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(bond);
+}
+
+static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype)
+{
+ struct bonding *bond = bond_dev->priv;
+ struct arp_pkt *arp = (struct arp_pkt *)skb->data;
+ int res = NET_RX_DROP;
+
+ if (!(bond_dev->flags & IFF_MASTER)) {
+ goto out;
+ }
+
+ if (!arp) {
+ dprintk("Packet has no ARP data\n");
+ goto out;
+ }
+
+ if (skb->len < sizeof(struct arp_pkt)) {
+ dprintk("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);
+ dprintk("Server received an ARP Reply from client\n");
+ }
+
+ res = NET_RX_SUCCESS;
+
+out:
+ dev_kfree_skb(skb);
+
+ return res;
+}
+
+/* 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) {
+ bond->alb_info.primary_is_promisc = 1;
+ dev_set_promiscuity(bond->curr_active_slave->dev, 1);
+ }
+
+ 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(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 (memcmp(rx_hash_table[index].mac_dst,
+ mac_bcast, ETH_ALEN)) {
+ 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(bond);
+
+ write_lock(&bond->curr_slave_lock);
+
+ if (slave != bond->curr_active_slave) {
+ rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
+ }
+
+ write_unlock(&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) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: failed to create an ARP packet\n");
+ continue;
+ }
+
+ skb->dev = client_info->slave->dev;
+
+ if (client_info->tag) {
+ skb = vlan_put_tag(skb, client_info->vlan_id);
+ if (!skb) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: failed to insert VLAN tag\n");
+ 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(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 untill this counter is zero so that
+ * not to confuse the clients.
+ */
+ bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
+
+ _unlock_rx_hashtbl(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(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) &&
+ memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
+ 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(bond);
+}
+
+/* mark all clients using src_ip to be updated */
+static void rlb_req_update_subnet_clients(struct bonding *bond, u32 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) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: found a client with no channel in "
+ "the client's hash table\n");
+ 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) &&
+ memcmp(client_info->slave->dev->dev_addr,
+ bond->dev->dev_addr, ETH_ALEN) &&
+ memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
+ 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 = (struct arp_pkt *)skb->nh.raw;
+ 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_src));
+ 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 (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) {
+ /* 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 (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
+ client_info->ntt = 1;
+ bond->alb_info.rx_ntt = 1;
+ } else {
+ client_info->ntt = 0;
+ }
+
+ if (!list_empty(&bond->vlan_list)) {
+ unsigned short vlan_id;
+ int res = vlan_get_tag(skb, &vlan_id);
+ if (!res) {
+ client_info->tag = 1;
+ client_info->vlan_id = vlan_id;
+ }
+ }
+
+ 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 = (struct arp_pkt *)skb->nh.raw;
+ struct slave *tx_slave = NULL;
+
+ if (arp->op_code == __constant_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);
+ }
+ dprintk("Server sent ARP Reply packet\n");
+ } else if (arp->op_code == __constant_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 relpy 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);
+ dprintk("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(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(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 packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type);
+ int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
+ int i;
+
+ spin_lock_init(&(bond_info->rx_hashtbl_lock));
+
+ _lock_rx_hashtbl(bond);
+
+ bond_info->rx_hashtbl = kmalloc(size, GFP_KERNEL);
+ if (!bond_info->rx_hashtbl) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: %s: Failed to allocate RLB hash table\n",
+ bond->dev->name);
+ _unlock_rx_hashtbl(bond);
+ return -1;
+ }
+
+ 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(bond);
+
+ /*initialize packet type*/
+ pk_type->type = __constant_htons(ETH_P_ARP);
+ pk_type->dev = bond->dev;
+ pk_type->func = rlb_arp_recv;
+
+ /* register to receive ARPs */
+ dev_add_pack(pk_type);
+
+ return 0;
+}
+
+static void rlb_deinitialize(struct bonding *bond)
+{
+ struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+
+ dev_remove_pack(&(bond_info->rlb_pkt_type));
+
+ _lock_rx_hashtbl(bond);
+
+ kfree(bond_info->rx_hashtbl);
+ bond_info->rx_hashtbl = NULL;
+ bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
+
+ _unlock_rx_hashtbl(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(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(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 = __constant_htons(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->mac.raw = data;
+ skb->nh.raw = data + ETH_HLEN;
+ skb->protocol = pkt.type;
+ skb->priority = TC_PRIO_CONTROL;
+ skb->dev = slave->dev;
+
+ if (!list_empty(&bond->vlan_list)) {
+ 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) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: failed to insert VLAN tag\n");
+ continue;
+ }
+ }
+
+ dev_queue_xmit(skb);
+ }
+}
+
+/* hw is a boolean parameter that determines whether we should try and
+ * set the hw address of the device as well as the hw address of the
+ * net_device
+ */
+static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
+{
+ struct net_device *dev = slave->dev;
+ struct sockaddr s_addr;
+
+ if (!hw) {
+ 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)) {
+ printk(KERN_ERR DRV_NAME
+ ": Error: dev_set_mac_address of dev %s failed! ALB "
+ "mode requires that the base driver support setting "
+ "the hw address also when the network device's "
+ "interface is open\n",
+ dev->name);
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+/* Caller must hold bond lock for write or curr_slave_lock for write*/
+static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
+{
+ struct slave *disabled_slave = NULL;
+ u8 tmp_mac_addr[ETH_ALEN];
+ int slaves_state_differ;
+
+ slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
+
+ memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
+ alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
+ alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
+
+ /* 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 bond lock
+ */
+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 = memcmp(slave->perm_hwaddr,
+ slave->dev->dev_addr,
+ ETH_ALEN);
+ perm_bond_diff = memcmp(slave->perm_hwaddr,
+ bond->dev->dev_addr,
+ ETH_ALEN);
+
+ if (perm_curr_diff && perm_bond_diff) {
+ struct slave *tmp_slave;
+ int i, found = 0;
+
+ bond_for_each_slave(bond, tmp_slave, i) {
+ if (!memcmp(slave->perm_hwaddr,
+ tmp_slave->dev->dev_addr,
+ ETH_ALEN)) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (found) {
+ alb_swap_mac_addr(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 premanent
+ * 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 (memcmp(slave->perm_hwaddr, bond->dev->dev_addr, ETH_ALEN)) {
+ bond_for_each_slave(bond, tmp_slave1, i) {
+ if (!memcmp(tmp_slave1->dev->dev_addr, slave->dev->dev_addr,
+ ETH_ALEN)) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (found) {
+ /* a slave was found that is using the mac address
+ * of the new slave
+ */
+ printk(KERN_ERR DRV_NAME
+ ": Error: the hw address of slave %s is not "
+ "unique - cannot enslave it!",
+ slave->dev->name);
+ return -EINVAL;
+ }
+
+ return 0;
+ }
+
+ /* 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 (!memcmp(tmp_slave1->perm_hwaddr,
+ tmp_slave2->dev->dev_addr,
+ ETH_ALEN)) {
+ 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 (!memcmp(tmp_slave1->dev->dev_addr,
+ bond->dev->dev_addr,
+ ETH_ALEN)) {
+
+ has_bond_addr = tmp_slave1;
+ }
+ }
+ }
+
+ if (free_mac_slave) {
+ alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
+ bond->alb_info.rlb_enabled);
+
+ printk(KERN_WARNING DRV_NAME
+ ": Warning: the hw address of slave %s is in use by "
+ "the bond; giving it the hw address of %s\n",
+ slave->dev->name, free_mac_slave->dev->name);
+
+ } else if (has_bond_addr) {
+ printk(KERN_ERR DRV_NAME
+ ": 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",
+ 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) {
+ if (slave->dev->set_mac_address == NULL) {
+ res = -EOPNOTSUPP;
+ goto unwind;
+ }
+
+ /* 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;
+ }
+ }
+
+ 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 = bond_dev->priv;
+ struct ethhdr *eth_data;
+ struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+ struct slave *tx_slave = NULL;
+ static u32 ip_bcast = 0xffffffff;
+ int hash_size = 0;
+ int do_tx_balance = 1;
+ u32 hash_index = 0;
+ u8 *hash_start = NULL;
+ int res = 1;
+
+ skb->mac.raw = (unsigned char *)skb->data;
+ eth_data = eth_hdr(skb);
+
+ /* make sure that the curr_active_slave and the slaves list do
+ * not change during tx
+ */
+ read_lock(&bond->lock);
+ read_lock(&bond->curr_slave_lock);
+
+ if (!BOND_IS_OK(bond)) {
+ goto out;
+ }
+
+ switch (ntohs(skb->protocol)) {
+ case ETH_P_IP:
+ if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) ||
+ (skb->nh.iph->daddr == ip_bcast) ||
+ (skb->nh.iph->protocol == IPPROTO_IGMP)) {
+ do_tx_balance = 0;
+ break;
+ }
+ hash_start = (char*)&(skb->nh.iph->daddr);
+ hash_size = sizeof(skb->nh.iph->daddr);
+ break;
+ case ETH_P_IPV6:
+ if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {
+ do_tx_balance = 0;
+ break;
+ }
+
+ hash_start = (char*)&(skb->nh.ipv6h->daddr);
+ hash_size = sizeof(skb->nh.ipv6h->daddr);
+ break;
+ case ETH_P_IPX:
+ if (ipx_hdr(skb)->ipx_checksum !=
+ __constant_htons(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) {
+ tlb_clear_slave(bond, tx_slave, 0);
+ }
+ }
+
+out:
+ if (res) {
+ /* no suitable interface, frame not sent */
+ dev_kfree_skb(skb);
+ }
+ read_unlock(&bond->curr_slave_lock);
+ read_unlock(&bond->lock);
+ return 0;
+}
+
+void bond_alb_monitor(struct bonding *bond)
+{
+ struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+ struct slave *slave;
+ int i;
+
+ read_lock(&bond->lock);
+
+ if (bond->kill_timers) {
+ goto out;
+ }
+
+ 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) {
+ /* the following code changes the promiscuity of the
+ * the curr_active_slave. It needs to be locked with a
+ * write lock to protect from other code that also
+ * sets the promiscuity.
+ */
+ write_lock(&bond->curr_slave_lock);
+
+ if (bond_info->primary_is_promisc &&
+ (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
+
+ 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;
+ }
+
+ write_unlock(&bond->curr_slave_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:
+ mod_timer(&(bond_info->alb_timer), jiffies + alb_delta_in_ticks);
+out:
+ 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,
+ bond->alb_info.rlb_enabled);
+ if (res) {
+ return res;
+ }
+
+ /* caller must hold the bond lock for write since the mac addresses
+ * are compared and may be swapped.
+ */
+ write_lock_bh(&bond->lock);
+
+ res = alb_handle_addr_collision_on_attach(bond, slave);
+
+ write_unlock_bh(&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;
+}
+
+/* Caller must hold bond lock for write */
+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.
+ *
+ * Caller must hold bond curr_slave_lock for write (or bond lock for write)
+ */
+void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
+{
+ 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 (!memcmp(tmp_slave->dev->dev_addr,
+ bond->dev->dev_addr, ETH_ALEN)) {
+ swap_slave = tmp_slave;
+ break;
+ }
+ }
+ }
+
+ /* 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,
+ bond->alb_info.rlb_enabled);
+ /* fasten bond mac on new current slave */
+ alb_send_learning_packets(new_slave, bond->dev->dev_addr);
+ }
+}
+
+int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
+{
+ struct bonding *bond = bond_dev->priv;
+ 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 (!memcmp(slave->dev->dev_addr, bond_dev->dev_addr, ETH_ALEN)) {
+ swap_slave = slave;
+ break;
+ }
+ }
+
+ if (swap_slave) {
+ alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
+ } else {
+ alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
+ bond->alb_info.rlb_enabled);
+
+ 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);
+ }
+ }
+
+ 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);
+ }
+}
+
