On Wed, Feb 14, 2018 at 01:07:41AM +0100, Andrew Lunn wrote:
> Further work is requires to support bridges using Boundary Clock or
> Transparent Clock mode.

Small correction: Boundary Clock (BC) works just fine if the DSA ports
are separate (not in a bridge device).

If the DSA ports *are* connected together in a bridge device, the
multicast PTP messages are incorrectly (?) forwarded out all ports by
the kernel SW bridge code.  The work around is to add a bridge rule to
drop these frames.  With the rule in place, BC also works in this

Transparent Clock would work as far as the driver and kernel go, but
ptp4l does not yet implement it.


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