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

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

quoted

At the moment the mv88e6xxx driver for mv88e6341 doesn't trap these messages
which leads to confusion when multiple end devices are connected to the
switch. Therefore, setup PTP traps. Leverage the already implemented policy
mechanism based on destination addresses. Configure the traps only if
timestamping is enabled so that non time aware use case is still functioning.  

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.