Re: [PATCH net-next v1] net: dsa: mv88e6xxx: Trap PTP traffic

On Sat Dec 11 2021, Richard Cochran wrote:

On Fri, Dec 10, 2021 at 09:14:10PM -0800, Jakub Kicinski wrote:

quoted

On Fri, 10 Dec 2021 01:07:59 +0100 Tobias Waldekranz wrote:

quoted

Do we know how PTP is supposed to work in relation to things like STP?
I.e should you be able to run PTP over a link that is currently in
blocking?

Not sure if I'm missing the real question but IIRC the standard
calls out that PTP clock distribution tree can be different that
the STP tree, ergo PTP ignores STP forwarding state.

That is correct.  The PTP will form its own spanning tree, and that
might be different than the STP.  In fact, the Layer2 PTP messages
have special MAC addresses that are supposed to be sent
unconditionally, even over blocked ports.

Thanks for clarification. This needs fixing in hellcreek too, as
pass_blocked is currently not set for the ptp fdb entries.

Thanks,
Kurt