pci function level reset

[Norbert Koch]

Hello.

I am running 12.1 on an embedded board which is equipped with an
intel gbit ethernet controller (Intel PRO/1000, em driver).

Either the ethernet controller or the bios has a bug, which
the board manufacturer confirmed.

After soft reboot gbit ethernet sometimes stops working
while 100/10mbit are ok.
Only after power down gbit works again (mostly).

As they only support windows and linux, their "fix" is writing
a '1' to /sys/bus/pci/devices/$dev/reset.
They say this is a "function level reset", whatever this means.

Is there any way (e.g. using pciconf) to do this under FreeBSD?

Thank you.


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