Re: [PATCH net-next 0/4] Fix broken PTP over IP on Ocelot switches

On Fri, Nov 26, 2021 at 01:21:14AM +0200, Vladimir Oltean wrote:

Po Liu reported recently that timestamping PTP over IPv4 is broken using
the felix driver on NXP LS1028A. This has been known for a while, of
course, since it has always been broken. The reason is because IP PTP
packets are currently treated as unknown IP multicast, which is not
flooded to the CPU port in the ocelot driver design, so packets don't
reach the ptp4l program.

The series solves the problem by installing packet traps per port when
the timestamping ioctl is called, depending on the RX filter selected
(L2, L4 or both).

Vladimir Oltean (4):
  net: mscc: ocelot: don't downgrade timestamping RX filters in
    SIOCSHWTSTAMP
  net: mscc: ocelot: create a function that replaces an existing VCAP
    filter
  net: ptp: add a definition for the UDP port for IEEE 1588 general
    messages
  net: mscc: ocelot: set up traps for PTP packets

For the series:

Acked-by: Richard Cochran <richardcochran@gmail.com>