[Linuxptp-users] DSA bridge PTP issues

[Riccardo L. <la...@le...>]

Hi there,
I'm working on a custom NXP iMX8 SoM connected to a Marvell MV88E6390 switch on port0 (eth0 as management port).
Five switch ports are exposed to the outside and bridged together in a dsa device (br0 soft bridge).
I'm running iMX linux-5.15.71 from NXP downstream repository.

I need my device to be a ptp device (master or slave depending on the specific application).

Since I can ping other PCs on the network I think Marvell DSA drivers are working, but ptp is not working.

I found and backported this patch (https://github.com/torvalds/linux/commit/9627c981ac82209c66c1b6c0e15c6cceb8656f01)
into my codebase, but when I launch ptp4l it's not working properly. Launching ptp4l on eth0 it says eth0 is
rejecting HWTSTAMP filtering configuration. Launching ptp4l on an outside facing port (lan1:5), instead, using IPv4
or IPv6 transport, it's like my SoM can't talk to other ptp devices: if my SoM is a ptp master i see announce, sync,
and follow-up messages get sent, and I see dly_req from other slaves coming back, but there are no dly_resp at all.
When my som is slave there are no packets from it. It's like all ptp related packets get ignored.

Is it possible to run ptp on eth0 (or on br0)? I want to syncronize devices on all the front facing ports.

I've attached `ip a` output, `ethtool -T eth0` output, and `ethtool -T lan1` output.

Best Regards,
_RL_

-- 
Riccardo Laiolo
Leaff Engineering - Digital Solutions & Algorithms