netdev - Re: [PATCH] bnx2: fixing a timout error due not refreshing TX timers correctly

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Date:	Wed, 16 Dec 2009 10:33:30 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	"leitao@...ux.vnet.ibm.com" <leitao@...ux.vnet.ibm.com>
cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] bnx2: fixing a timout error due not refreshing TX
 timers correctly


On Wed, 2009-12-16 at 04:09 -0800, leitao@...ux.vnet.ibm.com wrote:
> When running the following script on an active bnx2 interface:
> 
> while(true); do ifconfig ethX mtu 9000; ifconfig ethX mtu 1500; done
> 
> A timeout error appears and dumps the following stack:
> 
> NETDEV WATCHDOG: eth4 (bnx2): transmit queue 0 timed out
> ------------[ cut here ]------------
> Badness at net/sched/sch_generic.c:261
> <snip>
> 
> This patch just fixes the way that ->trans_start is refreshed.
> 
> Signed-off-by: Breno Leitao <leitao@...ux.vnet.ibm.com>

Thanks.  Acked-by: Michael Chan <mchan@...adcom.com>

> ---
>  drivers/net/bnx2.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
> index 4bfc808..f81f082 100644
> --- a/drivers/net/bnx2.c
> +++ b/drivers/net/bnx2.c
> @@ -655,9 +655,17 @@ bnx2_netif_stop(struct bnx2 *bp)
>  	bnx2_cnic_stop(bp);
>  	bnx2_disable_int_sync(bp);
>  	if (netif_running(bp->dev)) {
> +		int i;
> +
>  		bnx2_napi_disable(bp);
>  		netif_tx_disable(bp->dev);
> -		bp->dev->trans_start = jiffies;	/* prevent tx timeout */
> +		/* prevent tx timeout */
> +		for (i = 0; i <  bp->dev->num_tx_queues; i++) {
> +			struct netdev_queue *txq;
> +
> +			txq = netdev_get_tx_queue(bp->dev, i);
> +			txq->trans_start = jiffies;
> +		}
>  	}
>  }
>  


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