On Thu, Jun 15, 2017 at 8:48 AM, Miroslav Lichvar <mlich...@redhat.com> wrote:
> I doubt they will be added in 6, but 7.4 should have the OPT_CMSG
> option. Some minor changes in the chrony code will still be necessary
> in order to enable HW timestamping.

Yea, I wasn't expecting 6 to ever support it.

> Here is a copr repo for Fedora and CentOS 7 which has a patch to
> enable HW timestamping.
> https://copr.fedorainfracloud.org/coprs/mlichvar/chrony/
>
> It works even with <7.4 kernels if there is only one interface which
> supports HW timestamping as SOF_TIMESTAMPING_OPT_CMSG is not required
> in such case.

Oh, exciting, thanks!

Does that mean exactly one up interface that supports HWTSTAMP_FILTER_ALL?

Meaning, would I be ok if the other interfaces on the machine
supported things like HWTSTAMP_FILTER_PTP_V1_L4_SYNC,
HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ, etc, but did not support
HWTSTAMP_FILTER_ALL?

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