netdev - Re: [PATCH net-next 4/7] net/mlx4_en: Set carrier to off when a port is stopped

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Date:	Wed, 16 Jan 2013 16:00:16 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Amir Vadai <amirv@...lanox.com>
CC:	"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eugenia Emantayev <eugenia@...lanox.com>
Subject: Re: [PATCH net-next 4/7] net/mlx4_en: Set carrier to off when a
 port is stopped

On Wed, 2013-01-16 at 17:42 +0200, Amir Vadai wrote:
> From: Eugenia Emantayev <eugenia@...lanox.com>
> 
> Under heavy CPU load changing ring size/mtu/etc. could result in transmit
> timeout, since stop-start port might take more than 10 sec. Set
> netif_carrier_off to prevent tx queue transmit timeout.

A spurious link change can restart L3 auto-configuration (DHCP, SLAAC,
etc.)  netif_device_detach() also inhibits the watchdog and doesn't have
that problem.

Ben.

> Signed-off-by: Eugenia Emantayev <eugenia@...lanox.com>
> Signed-off-by: Amir Vadai <amirv@...lanox.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/en_netdev.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index 805e242..108c4cf 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -1212,6 +1212,7 @@ void mlx4_en_stop_port(struct net_device *dev)
>  
>  	/* Synchronize with tx routine */
>  	netif_tx_lock_bh(dev);
> +	netif_carrier_off(dev);
>  	netif_tx_stop_all_queues(dev);
>  	netif_tx_unlock_bh(dev);
>  

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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