mlx4_en: Add PTP hardware clock

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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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This commit is contained in:

Shawn Bohrer 2013-12-31 11:39:39 -06:00 • committed by David S. Miller

parent dd9b45598a

commit ad7d4eaed9

4 changed files with 198 additions and 8 deletions

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194

drivers/net/ethernet/mellanox/mlx4/en_clock.c

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3

drivers/net/ethernet/mellanox/mlx4/en_ethtool.c

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3

drivers/net/ethernet/mellanox/mlx4/en_main.c

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6

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

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