On Wed, Dec 02, 2020 at 04:41:45PM -0800, Jacob Keller wrote:
> You might try poking at the clock manually (try using phc_ctl, for
> example) and make sure that it behaves in a sane way in response to
> adjustment commands first. If that's working, then you could try sending
> basic traffic and making sure the reported timestamps seem sane too.

+1

phc_ctl is your first step.

To get time stamps, either hack ptp4l or use the Linux kernel testing
program, linux/tools/testing/selftests/net/timestamping.c (but update
hwconfig.rx_filter to use PTP V2).

Thanks,
Richard


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