netdev - Re: [PATCH net-next v4 1/2] mlx4

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Date:	Wed, 1 Jan 2014 10:46:45 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Shawn Bohrer <shawn.bohrer@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>, netdev@...r.kernel.org,
	tomk@...advisors.com, Hadar Hen Zion <hadarh@...lanox.com>,
	Shawn Bohrer <sbohrer@...advisors.com>
Subject: Re: [PATCH net-next v4 1/2] mlx4_en: Add PTP hardware clock

On Tue, Dec 31, 2013 at 11:39:39AM -0600, Shawn Bohrer wrote:
> From: Shawn Bohrer <sbohrer@...advisors.com>
> 
> This adds a PHC to the mlx4_en driver. We use reader/writer spinlocks to
> protect the timecounter since every packet received needs to call
> timecounter_cycle2time() when timestamping is enabled.  This can become
> a performance bottleneck with RSS and multiple receive queues if normal
> spinlocks are used.
> 
> This driver has been tested with both Documentation/ptp/testptp and the
> linuxptp project (http://linuxptp.sourceforge.net/) on a Mellanox
> ConnectX-3 card.
> 
> Signed-off-by: Shawn Bohrer <sbohrer@...advisors.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/en_clock.c   |  194 ++++++++++++++++++++++-
>  drivers/net/ethernet/mellanox/mlx4/en_ethtool.c |    3 +
>  drivers/net/ethernet/mellanox/mlx4/en_main.c    |    3 +
>  drivers/net/ethernet/mellanox/mlx4/mlx4_en.h    |    6 +
>  4 files changed, 198 insertions(+), 8 deletions(-)

Acked-by: Richard Cochran <richardcochran@...il.com>
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