@pali
I think:
this kernel has patches to make to make the host mode possible. In host mode any usb device should (doesn't mean it will) work as expected if the right kernel nodules are loaded and the device doesn't need to much power.

1st find out if there aren't any modules yet, if not you can try to compile your own. they should work if the USB ethernet adapter doesn't need too much energy (if it does use an active hub)

I recommend an hub in any way because then you can connect and disconnect your device without reboot.