On Tue, Dec 31, 2013 at 11:39:39AM -0600, Shawn Bohrer wrote:

From: Shawn Bohrer <redacted>

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 <redacted>
---
 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@gmail.com>