Because of packet reordering that can occur in the network, in the
hardware, or in the networking stack, a follow up message can appear
to arrive in the application before the matching sync message. As this
is a normal occurrence, and the sequenceID message field ensures
proper matching, the ptp4l program accepts out of order packets.
This patch adds an additional check using the software time stamps
from the networking stack to verify that the sync message did arrive
first. This check is only useful if the sequence IDs generated by
the master might possibly be incorrect.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
The power profile requires using VLAN priority tagged packets. The tags
may or may not reach the application. This commit adds code to handle the
tags in the case that they do appear.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
The upper layer code will be confused by the extra fourteen byte length
of the Ethernet header.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
It was a cute idea to have the raw Ethernet layer use just one socket,
but it ended up not working on some specific PTP time stamping hardware.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Stephan Gatzka
Richard Cochran
Geoff Salmon
Eliot Blennerhassett