Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1828 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
new file mode 100644
index 000000000..61ae62212
--- /dev/null
+++ b/drivers/net/bonding/bond_alb.c
@@ -0,0 +1,1828 @@
+/*
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ */
+
+#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 <net/bonding.h>
+#include <net/bond_alb.h>
+
+static const u8 mac_v6_allmcast[ETH_ALEN + 2] __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()
+
+/* Forward declaration */
+static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
+				      bool strict_match);
+static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
+static void rlb_src_unlink(struct bonding *bond, u32 index);
+static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
+			 u32 ip_dst_hash);
+
+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 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;
+}
+
+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);
+}
+
+static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
+			 int save_load)
+{
+	spin_lock_bh(&bond->mode_lock);
+	__tlb_clear_slave(bond, slave, save_load);
+	spin_unlock_bh(&bond->mode_lock);
+}
+
+/* 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 -ENOMEM;
+
+	spin_lock_bh(&bond->mode_lock);
+
+	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);
+
+	spin_unlock_bh(&bond->mode_lock);
+
+	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));
+
+	spin_lock_bh(&bond->mode_lock);
+
+	kfree(bond_info->tx_hashtbl);
+	bond_info->tx_hashtbl = NULL;
+
+	spin_unlock_bh(&bond->mode_lock);
+}
+
+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 */
+}
+
+static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
+{
+	struct slave *slave, *least_loaded;
+	struct list_head *iter;
+	long long max_gap;
+
+	least_loaded = NULL;
+	max_gap = LLONG_MIN;
+
+	/* Find the slave with the largest gap */
+	bond_for_each_slave_rcu(bond, slave, iter) {
+		if (bond_slave_can_tx(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;
+}
+
+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.
+	 */
+	spin_lock(&bond->mode_lock);
+	tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
+	spin_unlock(&bond->mode_lock);
+
+	return tx_slave;
+}
+
+/*********************** rlb specific functions ***************************/
+
+/* 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;
+
+	spin_lock_bh(&bond->mode_lock);
+
+	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) &&
+	    (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
+		/* update the clients MAC address */
+		ether_addr_copy(client_info->mac_dst, arp->mac_src);
+		client_info->ntt = 1;
+		bond_info->rx_ntt = 1;
+	}
+
+	spin_unlock_bh(&bond->mode_lock);
+}
+
+static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
+			struct slave *slave)
+{
+	struct arp_pkt *arp, _arp;
+
+	if (skb->protocol != cpu_to_be16(ETH_P_ARP))
+		goto out;
+
+	arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
+	if (!arp)
+		goto out;
+
+	/* We received an ARP from arp->ip_src.
+	 * We might have used this IP address previously (on the bonding host
+	 * itself or on a system that is bridged together with the bond).
+	 * However, if arp->mac_src is different than what is stored in
+	 * rx_hashtbl, some other host is now using the IP and we must prevent
+	 * sending out client updates with this IP address and the old MAC
+	 * address.
+	 * Clean up all hash table entries that have this address as ip_src but
+	 * have a different mac_src.
+	 */
+	rlb_purge_src_ip(bond, arp);
+
+	if (arp->op_code == htons(ARPOP_REPLY)) {
+		/* update rx hash table for this ARP */
+		rlb_update_entry_from_arp(bond, arp);
+		netdev_dbg(bond->dev, "Server received an ARP Reply from client\n");
+	}
+out:
+	return RX_HANDLER_ANOTHER;
+}
+
+/* Caller must hold rcu_read_lock() */
+static struct slave *__rlb_next_rx_slave(struct bonding *bond)
+{
+	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+	struct slave *before = NULL, *rx_slave = NULL, *slave;
+	struct list_head *iter;
+	bool found = false;
+
+	bond_for_each_slave_rcu(bond, slave, iter) {
+		if (!bond_slave_can_tx(slave))
+			continue;
+		if (!found) {
+			if (!before || before->speed < slave->speed)
+				before = slave;
+		} else {
+			if (!rx_slave || rx_slave->speed < slave->speed)
+				rx_slave = slave;
+		}
+		if (slave == bond_info->rx_slave)
+			found = true;
+	}
+	/* we didn't find anything after the current or we have something
+	 * better before and up to the current slave
+	 */
+	if (!rx_slave || (before && rx_slave->speed < before->speed))
+		rx_slave = before;
+
+	if (rx_slave)
+		bond_info->rx_slave = rx_slave;
+
+	return rx_slave;
+}
+
+/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
+static struct slave *rlb_next_rx_slave(struct bonding *bond)
+{
+	struct slave *rx_slave;
+
+	ASSERT_RTNL();
+
+	rcu_read_lock();
+	rx_slave = __rlb_next_rx_slave(bond);
+	rcu_read_unlock();
+
+	return rx_slave;
+}
+
+/* teach the switch the mac of a disabled slave
+ * on the primary for fault tolerance
+ *
+ * Caller must hold RTNL
+ */
+static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
+{
+	struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
+
+	if (!curr_active)
+		return;
+
+	if (!bond->alb_info.primary_is_promisc) {
+		if (!dev_set_promiscuity(curr_active->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(curr_active, addr, true);
+}
+
+/* slave being removed should not be active at this point
+ *
+ * Caller must hold rtnl.
+ */
+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 */
+	spin_lock_bh(&bond->mode_lock);
+
+	rx_hash_table = bond_info->rx_hashtbl;
+	index = bond_info->rx_hashtbl_used_head;
+	for (; index != RLB_NULL_INDEX; index = next_index) {
+		next_index = rx_hash_table[index].used_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 (is_valid_ether_addr(rx_hash_table[index].mac_dst)) {
+					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;
+			}
+		}
+	}
+
+	spin_unlock_bh(&bond->mode_lock);
+
+	if (slave != rtnl_dereference(bond->curr_active_slave))
+		rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
+}
+
+static void rlb_update_client(struct rlb_client_info *client_info)
+{
+	int i;
+
+	if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
+		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) {
+			netdev_err(client_info->slave->bond->dev,
+				   "failed to create an ARP packet\n");
+			continue;
+		}
+
+		skb->dev = client_info->slave->dev;
+
+		if (client_info->vlan_id) {
+			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+					       client_info->vlan_id);
+		}
+
+		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;
+
+	spin_lock_bh(&bond->mode_lock);
+
+	hash_index = bond_info->rx_hashtbl_used_head;
+	for (; hash_index != RLB_NULL_INDEX;
+	     hash_index = client_info->used_next) {
+		client_info = &(bond_info->rx_hashtbl[hash_index]);
+		if (client_info->ntt) {
+			rlb_update_client(client_info);
+			if (bond_info->rlb_update_retry_counter == 0)
+				client_info->ntt = 0;
+		}
+	}
+
+	/* do not update the entries again until this counter is zero so that
+	 * not to confuse the clients.
+	 */
+	bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
+
+	spin_unlock_bh(&bond->mode_lock);
+}
+
+/* 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;
+
+	spin_lock_bh(&bond->mode_lock);
+
+	hash_index = bond_info->rx_hashtbl_used_head;
+	for (; hash_index != RLB_NULL_INDEX;
+	     hash_index = client_info->used_next) {
+		client_info = &(bond_info->rx_hashtbl[hash_index]);
+
+		if ((client_info->slave == slave) &&
+		    is_valid_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;
+		/* fasten the change */
+		bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
+	}
+
+	spin_unlock_bh(&bond->mode_lock);
+}
+
+/* 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;
+
+	spin_lock(&bond->mode_lock);
+
+	hash_index = bond_info->rx_hashtbl_used_head;
+	for (; hash_index != RLB_NULL_INDEX;
+	     hash_index = client_info->used_next) {
+		client_info = &(bond_info->rx_hashtbl[hash_index]);
+
+		if (!client_info->slave) {
+			netdev_err(bond->dev, "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) &&
+		    !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
+					     bond->dev->dev_addr) &&
+		    is_valid_ether_addr(client_info->mac_dst)) {
+			client_info->ntt = 1;
+			bond_info->rx_ntt = 1;
+		}
+	}
+
+	spin_unlock(&bond->mode_lock);
+}
+
+static struct slave *rlb_choose_channel(struct sk_buff *skb,
+					struct bonding *bond,
+					const struct arp_pkt *arp)
+{
+	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+	struct slave *assigned_slave, *curr_active_slave;
+	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 reqeusts.
+		 * 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, "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, 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, "Server sent ARP Request packet\n");
+	}
+
+	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;
+
+	netdev_dbg(slave->bond->dev,
+		   "Send learning packet: dev %s mac %pM vlan %d\n",
+		   slave->dev->name, 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, void *_data)
+{
+	struct alb_walk_data *data = _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->nest_level == vlan_get_encap_level(upper) - 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 alb_walk_data data = {
+		.strict_match = strict_match,
+		.mac_addr = mac_addr,
+		.slave = slave,
+		.bond = bond,
+	};
+
+	/* 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, &data);
+	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)) {
+		netdev_err(slave->bond->dev, "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;
+}
+
+/* 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 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);
+
+		netdev_warn(bond->dev, "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) {
+		netdev_err(bond->dev, "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 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);
+
+		/* 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);
+		bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr,
+				  rollback_slave->dev->addr_len);
+	}
+
+	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;
+		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);
+		}
+
+		bond_dev_queue_xmit(bond, skb, tx_slave->dev);
+		goto out;
+	}
+
+	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 */
+	bond_tx_drop(bond->dev, skb);
+out:
+	return NETDEV_TX_OK;
+}
+
+netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
+{
+	struct bonding *bond = netdev_priv(bond_dev);
+	struct ethhdr *eth_data;
+	struct slave *tx_slave = NULL;
+	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->slave_arr);
+				count = slaves ? READ_ONCE(slaves->count) : 0;
+				if (likely(count))
+					tx_slave = slaves->arr[hash_index %
+							       count];
+			}
+			break;
+		}
+	}
+	return bond_do_alb_xmit(skb, bond, 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 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;
+	bool do_tx_balance = true;
+	u32 hash_index = 0;
+	const u8 *hash_start = NULL;
+
+	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->slave_arr);
+			count = slaves ? READ_ONCE(slaves->count) : 0;
+			if (likely(count))
+				tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
+						       count];
+		}
+	}
+
+	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)) {
+		atomic_set(&bond_info->tx_rebalance_counter, 0);
+		bond_info->lp_counter = 0;
+		goto re_arm;
+	}
+
+	rcu_read_lock();
+
+	atomic_inc(&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 addreses (!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 (atomic_read(&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;
+			}
+		}
+		atomic_set(&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 */
+	atomic_set(&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 */
+		atomic_set(&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);
+
+		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);
+}
+