From: Shawn Bohrer <sbohrer@rgmadvisors.com>
Date: Tue, 31 Dec 2013 17:39:39 +0000 (-0600)
Subject: mlx4_en: Add PTP hardware clock
X-Git-Tag: v3.14-rc1~94^2~315
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad7d4eaed995d76fb24a18e202fdf5072197ff0a;p=pandora-kernel.git

mlx4_en: Add PTP hardware clock

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@rgmadvisors.com>
Acked-By: Hadar Hen Zion <hadarh@mellanox.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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