tree 891303875fcca8c8110c949955b87e1447dbcdfc
parent 995a9090b2b7dc734351f3ac0ba8d913ffb87001
author Richard Cochran <richardcochran@gmail.com> 1333493957 +0000
committer David S. Miller <davem@davemloft.net> 1333531725 -0400

ethtool: Introduce a method for getting time stamping capabilities.

This commit adds a new ethtool ioctl that exposes the SO_TIMESTAMPING
capabilities of a network interface. In addition, user space programs
can use this ioctl to discover the PTP Hardware Clock (PHC) device
associated with the interface.

Since software receive time stamps are handled by the stack, the generic
ethtool code can answer the query correctly in case the MAC or PHY
drivers lack special time stamping features.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>