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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <e3cc8ecb4ce8c61b9eb79a2238b2b3570334ce5a.camel@suse.com>
Date:   Wed, 07 Apr 2021 13:36:43 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Grant Grundler <grundler@...omium.org>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Roland Dreier <roland@...nel.org>,
        nic_swsd <nic_swsd@...ltek.com>, netdev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>
Subject: 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:

> > 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