starting point for SOF_TIMESTAMPING_TX_SOFTWARE in bridges

Paul D newtwen at
Thu Aug 26 05:54:41 PDT 2021

Someone more experienced than I am might have a good answer.

How trivial is it to patch openwrt 21 and/or master in one place, such
that my brX/br-lan has the flag SOF_TIMESTAMPING_TX_SOFTWARE if the
underlying hardware/eth driver also has it?

I would like to run ptp4l on my bridge (swconfig, ath, DSA not in yet) 
and ptp4l mandates at least SOF_TIMESTAMPING_TX_SOFTWARE. But weirdness 
ensues and the source IP chosen is the WAN and packets just disappear 
when using L3.

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