--- /dev/null
+/*
+ * 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>
+
+
+
+#ifndef __long_aligned
+#define __long_aligned __attribute__((aligned((sizeof(long)))))
+#endif
+static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};
+static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
+ 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
+};
+static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
+
+#pragma pack(1)
+struct learning_pkt {
+ u8 mac_dst[ETH_ALEN];
+ u8 mac_src[ETH_ALEN];
+ __be16 type;
+ u8 padding[ETH_ZLEN - ETH_HLEN];
+};
+
+struct arp_pkt {
+ __be16 hw_addr_space;
+ __be16 prot_addr_space;
+ u8 hw_addr_len;
+ u8 prot_addr_len;
+ __be16 op_code;
+ u8 mac_src[ETH_ALEN]; /* sender hardware address */
+ __be32 ip_src; /* sender IP address */
+ u8 mac_dst[ETH_ALEN]; /* target hardware address */
+ __be32 ip_dst; /* target IP address */
+};
+#pragma pack()
+
+static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
+{
+ return (struct arp_pkt *)skb_network_header(skb);
+}
+
+/* Forward declaration */
+static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
+ 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 -1;
+
+ 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 (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
+ mac_bcast)) {
+ bond_info->rx_hashtbl[index].ntt = 1;
+ bond_info->rx_ntt = 1;
+ /* A slave has been removed from the
+ * table because it is either disabled
+ * or being released. We must retry the
+ * update to avoid clients from not
+ * being updated & disconnecting when
+ * there is stress
+ */
+ bond_info->rlb_update_retry_counter =
+ RLB_UPDATE_RETRY;
+ }
+ } else { /* there is no active slave */
+ rx_hash_table[index].slave = NULL;
+ }
+ }
+ }
+
+ 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)
+ 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) &&
+ !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
+ client_info->ntt = 1;
+ ntt = 1;
+ }
+ }
+
+ /* update the team's flag only after the whole iteration */
+ if (ntt) {
+ bond_info->rx_ntt = 1;
+ /* fasten the change */
+ bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
+ }
+
+ 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) &&
+ !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
+ 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)
+{
+ struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+ struct arp_pkt *arp = arp_pkt(skb);
+ 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 (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
+ /* 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 (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
+ client_info->ntt = 1;
+ bond->alb_info.rx_ntt = 1;
+ } else {
+ client_info->ntt = 0;
+ }
+
+ if (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 arp_pkt *arp = arp_pkt(skb);
+ struct slave *tx_slave = NULL;
+
+ /* Don't modify or load balance ARPs that do not originate locally
+ * (e.g.,arrive via a bridge).
+ */
+ if (!bond_slave_has_mac_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);
+ if (tx_slave)
+ ether_addr_copy(arp->mac_src, tx_slave->dev->dev_addr);
+ 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);
+
+ /* 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;
+ 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);
+ char *data;
+
+ 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;
+
+ data = skb_put(skb, size);
+ memcpy(data, &pkt, size);
+
+ skb_reset_mac_header(skb);
+ skb->network_header = skb->mac_header + ETH_HLEN;
+ skb->protocol = pkt.type;
+ skb->priority = TC_PRIO_CONTROL;
+ skb->dev = slave->dev;
+
+ if (vid)
+ __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
+
+ dev_queue_xmit(skb);
+}
+
+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 net_device *upper;
+ struct list_head *iter;
+ struct bond_vlan_tag *tags;
+
+ /* 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_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
+ if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) {
+ if (strict_match &&
+ ether_addr_equal_64bits(mac_addr,
+ upper->dev_addr)) {
+ alb_send_lp_vid(slave, mac_addr,
+ vlan_dev_vlan_proto(upper),
+ vlan_dev_vlan_id(upper));
+ } else if (!strict_match) {
+ 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);
+ }
+ }
+ rcu_read_unlock();
+}
+
+static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
+{
+ struct net_device *dev = slave->dev;
+ struct sockaddr s_addr;
+
+ if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
+ memcpy(dev->dev_addr, addr, dev->addr_len);
+ return 0;
+ }
+
+ /* for rlb each slave must have a unique hw mac addresses so that
+ * each slave will receive packets destined to a different mac
+ */
+ memcpy(s_addr.sa_data, addr, dev->addr_len);
+ s_addr.sa_family = dev->type;
+ if (dev_set_mac_address(dev, &s_addr)) {
+ 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[ETH_ALEN];
+
+ ether_addr_copy(tmp_mac_addr, slave1->dev->dev_addr);
+ alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
+ alb_set_slave_mac_addr(slave2, tmp_mac_addr);
+
+}
+
+/* Send learning packets after MAC address swap.
+ *
+ * Called with RTNL and no other locks
+ */
+static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
+ struct slave *slave2)
+{
+ int slaves_state_differ = (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);
+ }
+
+ /* 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);
+
+ 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 sa;
+ char tmp_addr[ETH_ALEN];
+ int res;
+
+ if (bond->alb_info.rlb_enabled)
+ return 0;
+
+ bond_for_each_slave(bond, slave, iter) {
+ /* save net_device's current hw address */
+ ether_addr_copy(tmp_addr, slave->dev->dev_addr);
+
+ res = dev_set_mac_address(slave->dev, addr);
+
+ /* restore net_device's hw address */
+ ether_addr_copy(slave->dev->dev_addr, tmp_addr);
+
+ 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 */
+ bond_for_each_slave(bond, rollback_slave, iter) {
+ if (rollback_slave == slave)
+ break;
+ ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr);
+ dev_set_mac_address(rollback_slave->dev, &sa);
+ ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr);
+ }
+
+ 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 int 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;
+}
+
+int 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 ? ACCESS_ONCE(slaves->count) : 0;
+ if (likely(count))
+ tx_slave = slaves->arr[hash_index %
+ count];
+ }
+ break;
+ }
+ }
+ return bond_do_alb_xmit(skb, bond, tx_slave);
+}
+
+int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct ethhdr *eth_data;
+ struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+ struct slave *tx_slave = NULL;
+ static const __be32 ip_bcast = htonl(0xffffffff);
+ int hash_size = 0;
+ bool do_tx_balance = true;
+ u32 hash_index = 0;
+ const u8 *hash_start = NULL;
+ struct ipv6hdr *ip6hdr;
+
+ skb_reset_mac_header(skb);
+ eth_data = eth_hdr(skb);
+
+ switch (ntohs(skb->protocol)) {
+ case ETH_P_IP: {
+ const struct iphdr *iph = ip_hdr(skb);
+
+ if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
+ (iph->daddr == ip_bcast) ||
+ (iph->protocol == IPPROTO_IGMP)) {
+ do_tx_balance = false;
+ break;
+ }
+ hash_start = (char *)&(iph->daddr);
+ hash_size = sizeof(iph->daddr);
+ }
+ break;
+ case ETH_P_IPV6:
+ /* IPv6 doesn't really use broadcast mac address, but leave
+ * that here just in case.
+ */
+ if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
+ do_tx_balance = 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;
+ }
+
+ /* Additianally, DAD probes should not be tx-balanced as that
+ * will lead to false positives for duplicate addresses and
+ * prevent address configuration from working.
+ */
+ ip6hdr = ipv6_hdr(skb);
+ if (ipv6_addr_any(&ip6hdr->saddr)) {
+ do_tx_balance = false;
+ break;
+ }
+
+ hash_start = (char *)&(ipv6_hdr(skb)->daddr);
+ hash_size = sizeof(ipv6_hdr(skb)->daddr);
+ break;
+ case ETH_P_IPX:
+ if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
+ /* something is wrong with this packet */
+ do_tx_balance = false;
+ 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 = false;
+ break;
+ }
+
+ 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) {
+ hash_index = _simple_hash(hash_start, hash_size);
+ tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
+ }
+
+ return bond_do_alb_xmit(skb, bond, tx_slave);
+}
+
+void bond_alb_monitor(struct work_struct *work)
+{
+ struct bonding *bond = container_of(work, struct bonding,
+ alb_work.work);
+ struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+ struct list_head *iter;
+ struct slave *slave;
+
+ if (!bond_has_slaves(bond)) {
+ bond_info->tx_rebalance_counter = 0;
+ bond_info->lp_counter = 0;
+ goto re_arm;
+ }
+
+ rcu_read_lock();
+
+ bond_info->tx_rebalance_counter++;
+ bond_info->lp_counter++;
+
+ /* send learning packets */
+ if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
+ bool strict_match;
+
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ /* If updating current_active, use all currently
+ * user mac 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 (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
+ bond_for_each_slave_rcu(bond, slave, iter) {
+ tlb_clear_slave(bond, slave, 1);
+ if (slave == rcu_access_pointer(bond->curr_active_slave)) {
+ SLAVE_TLB_INFO(slave).load =
+ bond_info->unbalanced_load /
+ BOND_TLB_REBALANCE_INTERVAL;
+ bond_info->unbalanced_load = 0;
+ }
+ }
+ bond_info->tx_rebalance_counter = 0;
+ }
+
+ if (bond_info->rlb_enabled) {
+ if (bond_info->primary_is_promisc &&
+ (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
+
+ /* dev_set_promiscuity requires rtnl and
+ * nothing else. Avoid race with bond_close.
+ */
+ rcu_read_unlock();
+ if (!rtnl_trylock())
+ goto re_arm;
+
+ bond_info->rlb_promisc_timeout_counter = 0;
+
+ /* If the primary was set to promiscuous mode
+ * because a slave was disabled then
+ * it can now leave promiscuous mode.
+ */
+ dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
+ -1);
+ bond_info->primary_is_promisc = 0;
+
+ rtnl_unlock();
+ rcu_read_lock();
+ }
+
+ if (bond_info->rlb_rebalance) {
+ bond_info->rlb_rebalance = 0;
+ rlb_rebalance(bond);
+ }
+
+ /* check if clients need updating */
+ if (bond_info->rx_ntt) {
+ if (bond_info->rlb_update_delay_counter) {
+ --bond_info->rlb_update_delay_counter;
+ } else {
+ rlb_update_rx_clients(bond);
+ if (bond_info->rlb_update_retry_counter)
+ --bond_info->rlb_update_retry_counter;
+ else
+ bond_info->rx_ntt = 0;
+ }
+ }
+ }
+ rcu_read_unlock();
+re_arm:
+ queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
+}
+
+/* assumption: called before the slave is attached to the bond
+ * and not locked by the bond lock
+ */
+int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
+{
+ int res;
+
+ res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
+ if (res)
+ return res;
+
+ res = alb_handle_addr_collision_on_attach(bond, slave);
+ if (res)
+ return res;
+
+ tlb_init_slave(slave);
+
+ /* order a rebalance ASAP */
+ bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
+
+ if (bond->alb_info.rlb_enabled)
+ bond->alb_info.rlb_rebalance = 1;
+
+ return 0;
+}
+
+/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
+ * if necessary.
+ *
+ * Caller must hold RTNL and no other locks
+ */
+void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
+{
+ if (bond_has_slaves(bond))
+ alb_change_hw_addr_on_detach(bond, slave);
+
+ tlb_clear_slave(bond, slave, 0);
+
+ if (bond->alb_info.rlb_enabled) {
+ bond->alb_info.rx_slave = NULL;
+ rlb_clear_slave(bond, slave);
+ }
+
+}
+
+void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
+{
+ struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+
+ if (link == BOND_LINK_DOWN) {
+ tlb_clear_slave(bond, slave, 0);
+ if (bond->alb_info.rlb_enabled)
+ rlb_clear_slave(bond, slave);
+ } else if (link == BOND_LINK_UP) {
+ /* order a rebalance ASAP */
+ bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
+ if (bond->alb_info.rlb_enabled) {
+ bond->alb_info.rlb_rebalance = 1;
+ /* If the updelay module parameter is smaller than the
+ * forwarding delay of the switch the rebalance will
+ * not work because the rebalance arp replies will
+ * not be forwarded to the clients..
+ */
+ }
+ }
+
+ if (bond_is_nondyn_tlb(bond)) {
+ if (bond_update_slave_arr(bond, NULL))
+ pr_err("Failed to build slave-array for TLB mode.\n");
+ }
+}
+
+/**
+ * bond_alb_handle_active_change - assign new curr_active_slave
+ * @bond: our bonding struct
+ * @new_slave: new slave to assign
+ *
+ * Set the bond->curr_active_slave to @new_slave and handle
+ * mac address swapping and promiscuity changes as needed.
+ *
+ * Caller must hold RTNL
+ */
+void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
+{
+ struct slave *swap_slave;
+ struct slave *curr_active;
+
+ curr_active = rtnl_dereference(bond->curr_active_slave);
+ if (curr_active == new_slave)
+ return;
+
+ if (curr_active && bond->alb_info.primary_is_promisc) {
+ dev_set_promiscuity(curr_active->dev, -1);
+ bond->alb_info.primary_is_promisc = 0;
+ bond->alb_info.rlb_promisc_timeout_counter = 0;
+ }
+
+ swap_slave = curr_active;
+ rcu_assign_pointer(bond->curr_active_slave, new_slave);
+
+ if (!new_slave || !bond_has_slaves(bond))
+ return;
+
+ /* set the new curr_active_slave to the bonds mac address
+ * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
+ */
+ if (!swap_slave)
+ swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
+
+ /* Arrange for swap_slave and new_slave to temporarily be
+ * ignored so we can mess with their MAC addresses without
+ * fear of interference from transmit activity.
+ */
+ if (swap_slave)
+ tlb_clear_slave(bond, swap_slave, 1);
+ tlb_clear_slave(bond, new_slave, 1);
+
+ /* in TLB mode, the slave might flip down/up with the old dev_addr,
+ * and thus filter bond->dev_addr's packets, so force bond's mac
+ */
+ if (BOND_MODE(bond) == BOND_MODE_TLB) {
+ struct sockaddr sa;
+ u8 tmp_addr[ETH_ALEN];
+
+ ether_addr_copy(tmp_addr, new_slave->dev->dev_addr);
+
+ memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
+ sa.sa_family = bond->dev->type;
+ /* we don't care if it can't change its mac, best effort */
+ dev_set_mac_address(new_slave->dev, &sa);
+
+ ether_addr_copy(new_slave->dev->dev_addr, tmp_addr);
+ }
+
+ /* 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);
+ 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 *sa = addr;
+ struct slave *curr_active;
+ struct slave *swap_slave;
+ int res;
+
+ if (!is_valid_ether_addr(sa->sa_data))
+ return -EADDRNOTAVAIL;
+
+ res = alb_set_mac_address(bond, addr);
+ if (res)
+ return res;
+
+ memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
+
+ /* If there is no curr_active_slave there is nothing else to do.
+ * Otherwise we'll need to pass the new address to it and handle
+ * duplications.
+ */
+ 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);
+
+ 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);
+}
+
Code Review / kvmfornfv.git / blobdiff