Hi,
eth1 is actually what in your predefined ubuntu would be eth0. I tried in the ubuntu distribution and we have the same problem, the filter HWTSTAMP_FILTER_ALL is not provided by the driver for eth0.
On my case I am building a specific yocto distribution, but i am using anyway the nvethernet driver.
Is there any version where that filter is enabled? Or a patch?
I found this topic (Nvidia Orin linuxptp (ptp4l) hardware timestamping[Uploading: ptp4l.conf...]() - #6 by sebastian-uav2022) interesting on that regard, but they just fix ptp sources and the actually work over layer 2.
Regards,
Alvaro.