Re: [PATCH net-next v4 0/4] usbnet: speed reporting for devices without MDIO

Am Dienstag, den 06.04.2021, 18:01 +0000 schrieb Grant Grundler:

quoted

Ethernet does not support
different rates in each direction. So if RX and TX are different, i
would actually say something is broken.

Agreed. The question is: Is there data or some heuristics we can use
to determine if the physical layer/link is ethernet?
I'm pessimistic we will be able to since this is at odds with the
intent of the CDC spec.

Yes, CDC intends to hide that. We can conclude that an asymmetric link
rules out ethernet, but anything else is difficult.

	Regards
		Oliver