netdev - Re: [PATCH net-next] bnx2x: avoid TX timeout when stopping device

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Date:	Wed, 12 May 2010 11:27:38 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	netdev@...r.kernel.org, Eilon Greenstein <eilong@...adcom.com>,
	Vladislav Zolotarov <vladz@...adcom.com>,
	Dmitry Kravkov <dmitry@...adcom.com>,
	Michael Chan <mchan@...adcom.com>,
	Breno Leitao <leitao@...ux.vnet.ibm.com>
Subject: Re: [PATCH net-next] bnx2x: avoid TX timeout when stopping device

Le mercredi 12 mai 2010 à 11:09 +0200, Stanislaw Gruszka a écrit :
> When stop device call netif_carrier_off() just after disabling TX queue to
> avoid possibility of netdev watchdog warning and ->ndo_tx_timeout() invocation.
> 
> Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
> ---

This reminds me I saw some strange things in bnx2.c for a similar
symptom.

Commit e6bf95ffa8d6f8f4b7ee33ea01490d95b0bbeb6e

Would you take a look at this too ?

Or if this kind of trans_start refresh on all queues is really needed,
it should be a core network provided function, not implemented on every
driver...

Thanks :)

>  drivers/net/bnx2x_main.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
> index 2bc35c7..57ff5b3 100644
> --- a/drivers/net/bnx2x_main.c
> +++ b/drivers/net/bnx2x_main.c
> @@ -8499,6 +8499,7 @@ static int bnx2x_nic_unload(struct bnx2x *bp, int unload_mode)
>  
>  	/* Disable HW interrupts, NAPI and Tx */
>  	bnx2x_netif_stop(bp, 1);
> +	netif_carrier_off(bp->dev);
>  
>  	del_timer_sync(&bp->timer);
>  	SHMEM_WR(bp, func_mb[BP_FUNC(bp)].drv_pulse_mb,
> @@ -8524,8 +8525,6 @@ static int bnx2x_nic_unload(struct bnx2x *bp, int unload_mode)
>  
>  	bp->state = BNX2X_STATE_CLOSED;
>  
> -	netif_carrier_off(bp->dev);
> -
>  	/* The last driver must disable a "close the gate" if there is no
>  	 * parity attention or "process kill" pending.
>  	 */
> @@ -13431,6 +13430,7 @@ static int bnx2x_eeh_nic_unload(struct bnx2x *bp)
>  	bp->rx_mode = BNX2X_RX_MODE_NONE;
>  
>  	bnx2x_netif_stop(bp, 0);
> +	netif_carrier_off(bp->dev);
>  
>  	del_timer_sync(&bp->timer);
>  	bp->stats_state = STATS_STATE_DISABLED;
> @@ -13457,8 +13457,6 @@ static int bnx2x_eeh_nic_unload(struct bnx2x *bp)
>  
>  	bp->state = BNX2X_STATE_CLOSED;
>  
> -	netif_carrier_off(bp->dev);
> -
>  	return 0;
>  }
>  


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