[Linuxptp-users] Intel X722 maybe incompatible with IEEE1588 2.1

[Cliff S. <csp...@go...>]

I'm looking into it further, but it looks like the X722 (which uses
the i40e driver) does not record RX timestamps on layer 2 1588 event
packets where the version is set to 2.1 rather than 2.

I found this issue previously reported last year
(https://www.mail-archive.com/lin...@li.../msg02414.html).
I believe this is the root cause. An easy workaround is to manually
patch linuxptp to set version 2.0.

-cliff