netdev - Re: [PATCH 1/1] bridge: fix message_age

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Date:	Tue, 10 Sep 2013 11:41:52 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Chris Healy <cphealy@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
	buytenh@...tstofly.org
Subject: Re: [PATCH 1/1] bridge: fix message_age_timer calculation

On Mon,  9 Sep 2013 09:56:08 -0700
Chris Healy <cphealy@...il.com> wrote:

> This changes the message_age_timer calculation to use the BPDU's max age as opposed to the local bridge's max age.  This is in accordance with section 8.6.2.3.2 Step 2 of the 802.1D-1998 sprecification.
> 
> With the current implementation, when running with very large bridge diameters, convergance will not always occur even if a root bridge is configured to have a longer max age.
> 
> Tested successfully on bridge diameters of ~200.
> 
> Signed-off-by: Chris Healy <cphealy@...il.com>
> ---
>  net/bridge/br_stp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
> index 1c0a50f..f1887ba 100644
> --- a/net/bridge/br_stp.c
> +++ b/net/bridge/br_stp.c
> @@ -209,7 +209,7 @@ static void br_record_config_information(struct net_bridge_port *p,
>  	p->designated_age = jiffies - bpdu->message_age;
>  
>  	mod_timer(&p->message_age_timer, jiffies
> -		  + (p->br->max_age - bpdu->message_age));
> +		  + (bpdu->max_age - bpdu->message_age));
>  }
>  
>  /* called under bridge lock */

This makes sense.

Acked-by: Stephen Hemminger <stephen@...workplumber.org>
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