netdev - Re: [PATCH net-next V3 4/4] net/mlx5e: Add PTP Hardware Clock (PHC) support

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Message-ID: <20160105124939.GB5433@localhost.localdomain>
Date:	Tue, 5 Jan 2016 13:49:39 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Saeed Mahameed <saeedm@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eran Ben Elisha <eranbe@...lanox.com>,
	Tal Alon <talal@...lanox.com>,
	Majd Dibbiny <majd@...lanox.com>,
	Achiad Shochat <achiad@...lanox.com>, saeedm@....mellanox.co.il
Subject: Re: [PATCH net-next V3 4/4] net/mlx5e: Add PTP Hardware Clock (PHC)
 support

On Tue, Dec 29, 2015 at 02:58:32PM +0200, Saeed Mahameed wrote:
> From: Eran Ben Elisha <eranbe@...lanox.com>
> 
> Add a PHC support to the mlx5_en driver. 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.
> 
> The driver has been tested with both Documentation/ptp/testptp and the
> linuxptp project (http://linuxptp.sourceforge.net/) on a Mellanox
> ConnectX-4 card.
> 
> Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
> Cc: Richard Cochran <richardcochran@...il.com>
> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>

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