linux-kernel - Re: [PATCH] bonding: Inactive slaves should keep inactive flag's value to 1 in tlb and alb mode.

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Message-ID: <5330FB34.4090005@huawei.com>
Date:	Tue, 25 Mar 2014 11:42:44 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Zheng Li <zheng.x.li@...cle.com>, <netdev@...r.kernel.org>,
	<fubar@...ibm.com>, <andy@...yhouse.net>
CC:	<linux-kernel@...r.kernel.org>, <davem@...emloft.net>,
	<joe.jin@...cle.com>
Subject: Re: [PATCH] bonding: Inactive slaves should keep inactive flag's
 value to 1 in tlb and alb mode.

On 2014/3/25 11:00, Zheng Li wrote:
> In bond mode tlb and alb, inactive slaves should keep inactive flag to
> 1 to refuse to receive broadcast packets. Now, active slave send broadcast packets
> (for example ARP requests) which will arrive inactive slaves on same host from switch,
> but inactive slave's inactive flag is zero that cause bridge receive the broadcast
> packets to produce a wrong entry in forward table. Typical situation is domu send some
> ARP request which go out from dom0 bond's active slave, then the ARP broadcast request
> packets go back to inactive slave from switch, because the inactive slave's inactive
> flag is zero, kernel will receive the packets and pass them to bridge, that cause dom0's
> bridge map domu's MAC address to port of bond, bridge should map domu's MAC to port of vif.
> 
> Signed-off-by: Zheng Li <zheng.x.li@...cle.com>
> ---
>  drivers/net/bonding/bond_main.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index e5628fc..8761df6 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -3062,7 +3062,7 @@ static int bond_open(struct net_device *bond_dev)
>  				&& (slave != bond->curr_active_slave)) {
>  				bond_set_slave_inactive_flags(slave,
>  							      BOND_SLAVE_NOTIFY_NOW);
> -			} else {
> +			} else if (!bond_is_lb(bond)) {
>  				bond_set_slave_active_flags(slave,
>  							    BOND_SLAVE_NOTIFY_NOW);
>  			}
> 
I think you did not fix the problem completely, the state monitor will change the status for the slaves
and the inactive slave still could receive the broadcast.

Regards
Ding

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