bonding: 802.3ad: make aggregator_identifier bond-private

aggregator_identifier is used to assign unique aggregator identifiers
to aggregators of a bond during device enslaving.

aggregator_identifier is currently a global variable that is zeroed in
bond_3ad_initialize().

This sequence will lead to duplicate aggregator identifiers for eth1 and eth3:

create bond0
change bond0 mode to 802.3ad
enslave eth0 to bond0 		//eth0 gets agg id 1
enslave eth1 to bond0 		//eth1 gets agg id 2
create bond1
change bond1 mode to 802.3ad
enslave eth2 to bond1		//aggregator_identifier is reset to 0
				//eth2 gets agg id 1
enslave eth3 to bond0 		//eth3 gets agg id 2

Fix this by making aggregator_identifier private to the bond.

Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Acked-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index cce1f1bf90b4..6d20fbde8d43 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1796,8 +1796,6 @@ void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
         BOND_AD_INFO(bond).agg_select_timer = timeout;
 }
 
-static u16 aggregator_identifier;
-
 /**
  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
  * @bond: bonding struct to work on
@@ -1811,7 +1809,7 @@ void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
                                 bond->dev->dev_addr)) {
 
-                aggregator_identifier = 0;
+                BOND_AD_INFO(bond).aggregator_identifier = 0;
 
                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
@@ -1880,7 +1878,7 @@ void bond_3ad_bind_slave(struct slave *slave)
                 ad_initialize_agg(aggregator);
 
                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
-                aggregator->aggregator_identifier = (++aggregator_identifier);
+                aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
                 aggregator->slave = slave;
                 aggregator->is_active = 0;
                 aggregator->num_of_ports = 0;
diff --git a/drivers/net/bonding/bond_3ad.h b/drivers/net/bonding/bond_3ad.h
index 13dc9d3c5e34..f4dd9592ac62 100644
--- a/drivers/net/bonding/bond_3ad.h
+++ b/drivers/net/bonding/bond_3ad.h
@@ -253,6 +253,7 @@ struct ad_system {
 struct ad_bond_info {
         struct ad_system system;            /* 802.3ad system structure */
         u32 agg_select_timer;       // Timer to select aggregator after all adapter's hand shakes
+        u16 aggregator_identifier;
 };
 
 struct ad_slave_info {