tree f56d49b32b2183e076741b590bb7ebd797d53c99
parent c6cb090ba7cd88aec03718dab76e4dad56862cae
author Patrick Ohly <patrick.ohly@intel.com> 1234415023 +0000
committer David S. Miller <davem@davemloft.net> 1234768407 -0800

igb: use timecompare to implement hardware time stamping

Both TX and RX hardware time stamping are implemented.  Due to
hardware limitations it is not possible to verify reliably which
packet was time stamped when multiple were pending for sending; this
could be solved by only allowing one packet marked for hardware time
stamping into the queue (not implemented yet).

RX time stamping relies on the flag in the packet descriptor which
marks packets that were time stamped. In "all packet" mode this flag
is not set. TODO: also support that mode (even though it'll suffer
from race conditions).

Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>