netdev - Re: mlx4_en: Only cycle port if HW timestamp config changes

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Date:	Wed, 1 Jan 2014 10:52:21 +0200
From:	Hadar Hen-Zion <hadarh@....mellanox.co.il>
To:	Shawn Bohrer <shawn.bohrer@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>,
	Richard Cochran <richardcochran@...il.com>,
	netdev@...r.kernel.org, tomk@...advisors.com,
	Shawn Bohrer <sbohrer@...advisors.com>
Subject: Re: mlx4_en: Only cycle port if HW timestamp config changes

On 31/12/13 11:39 -0600, Shawn Bohrer wrote:
> From: Shawn Bohrer <sbohrer@...advisors.com>
> 
> If the hwtstamp_config matches what is currently set for the device then
> simply return.  Without this change any program that tries to enable
> hardware timestamps will cause the link to cycle even if hardware
> timstamps were already enabled.
> 
> Signed-off-by: Shawn Bohrer <sbohrer@...advisors.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/en_clock.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
> index 30712b3..abaf6bb 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
> @@ -42,6 +42,10 @@ int mlx4_en_timestamp_config(struct net_device *dev, int tx_type, int rx_filter)
>  	int port_up = 0;
>  	int err = 0;
>  
> +	if (priv->hwtstamp_config.tx_type == tx_type &&
> +	    priv->hwtstamp_config.rx_filter == rx_filter)
> +		return 0;
> +
>  	mutex_lock(&mdev->state_lock);
>  	if (priv->port_up) {
>  		port_up = 1;
> -- 
> 1.7.7.6
> 
> --
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Acked-By: Hadar Hen Zion <hadarh@...lanox.com>
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