netdev - Re: [PATCH] bonding: 802.3ad: make aggregator

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Date:	Fri, 14 Feb 2014 18:18:42 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	Jiri Bohac <jiri@...a.cz>
Cc:	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] bonding: 802.3ad: make aggregator_identifier bond-private

On Fri, Feb 14, 2014 at 06:13:50PM +0100, Jiri Bohac wrote:
>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@...e.cz>

Acked-by: Veaceslav Falico <vfalico@...hat.com>

>---
> drivers/net/bonding/bond_3ad.c | 6 ++----
> drivers/net/bonding/bond_3ad.h | 1 +
> 2 files changed, 3 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
>index 4ced594..dcf2ee8 100644
>--- a/drivers/net/bonding/bond_3ad.c
>+++ b/drivers/net/bonding/bond_3ad.c
>@@ -1806,8 +1806,6 @@ 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
>@@ -1821,7 +1819,7 @@ void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
> 	if (MAC_ADDRESS_COMPARE(&(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);
>@@ -1892,7 +1890,7 @@ int 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 5d91ad0..1f081c8 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 {
>
>-- 
>Jiri Bohac
>e-mail/jabber: jiri@...a.cz
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