Re: [Linuxptp-users] Hardware PTP clock synchronization

[Гаврилов А. <le...@im...>]

Hello!.

Intel® 82576 Gigabit Ethernet Controller Datasheet:
"On both transmit and receive sides the timestamp values are locked in registers until values are read by
software. As a result if a new PTP packet that requires time stamp arrives before software access it is 
not time stamped. In some cases in the receive path a packet that was timestamped might be lost and 
not reach the host. To avoid a deadlock condition on the time stamp registers the software should keep 
a watch dog timer to clear locking of the time stamp register. The interval counted by such a timer 
should be at least higher then the expected interval between two Sync or Delay_Req packets depends 
on the node state (Master or Slave)."

How  should  I  modify the source code of igb driver (or ptp4l) to use
the timer?

Sincerely, Alexander.