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

[Oliver Neukum]

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

> > 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