netdev - Re: [PATCH net] bonding: Avoid possible de-sync with arp

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Date:	Fri, 06 Sep 2013 19:49:38 +0200
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	Marcelo Ricardo Leitner <mleitner@...hat.com>
CC:	netdev@...r.kernel.org, naleksan@...hat.com, fubar@...ibm.com,
	andy@...yhouse.net
Subject: Re: [PATCH net] bonding: Avoid possible de-sync with arp_validate

On 09/06/2013 07:41 PM, Marcelo Ricardo Leitner wrote:
> Hi Dave,
> 
> Please queue this one for -stable trees too.
> 
> Thanks.
> 
> ---8<---
> 
> As bond_store_arp_validation and bond_store_arp_interval doesn't
> deal with each other, we can't chain both at bond_open, otherwise
> we are open to this de-sync state, steps in sequence:
> - bond is down
> - arp_interval = 0
> - arp_validate = 1 or 2
> - bond is up
> - arp_interval = 1
> 
> This would lead to bond issuing ARP requests but never listening
> to the replies, because the tap wasn't attached. After reaching
> this state, while bond is up, setting arp_validate won't help
> as it only acts if needed.
> ---
>  drivers/net/bonding/bond_main.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 39e5b1c..805d098 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -3180,11 +3180,10 @@ static int bond_open(struct net_device *bond_dev)
>  	if (bond->params.miimon)  /* link check interval, in milliseconds. */
>  		queue_delayed_work(bond->wq, &bond->mii_work, 0);
>  
> -	if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
> +	if (bond->params.arp_interval)    /* arp interval, in milliseconds. */
>  		queue_delayed_work(bond->wq, &bond->arp_work, 0);
> -		if (bond->params.arp_validate)
> -			bond->recv_probe = bond_arp_rcv;
> -	}
> +	if (bond->params.arp_validate)
> +		bond->recv_probe = bond_arp_rcv;
>  
>  	if (bond->params.mode == BOND_MODE_8023AD) {
>  		queue_delayed_work(bond->wq, &bond->ad_work, 0);
> 
Thanks for fixing this.

Acked-by: Nikolay Aleksandrov <nikolay@...hat.com>

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