netdev - Re: net: phy: Dealing with 88e1543 dual-port mode

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Message-ID: <875z609yt0.fsf@waldekranz.com>
Date:   Fri, 20 Nov 2020 10:12:43 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Antoine Tenart <atenart@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: net: phy: Dealing with 88e1543 dual-port mode

On Fri, Nov 20, 2020 at 00:40, Russell King - ARM Linux admin <linux@...linux.org.uk> wrote:
> I think you're advocating calling the fiber interface "SGMII", which
> would be totally wrong.
>
> SGMII is a Cisco modification of 802.3 1000base-X to allow 10M and 100M
> speeds to be used over a single serdes lane in each direction.
>
> 1000base-X is what you run over a fiber link. This is not SGMII. Using
> "SGMII" for 1000base-X is incorrect, but a common abuse of the term in
> industry. Abusing a term does not make it correct, especially when it
> comes to defining further standards.
>
> (This is one of my pet peaves, sorry.)

Nomenclature is very important, no excuse necessary.

You are right that SGMII is not the term I am looking for, but I am not
sure 1000base-X is either. I am looking for a word that describes the
serial interface that can run in either 1000base-X or 100base-FX mode
(and possibly other ancient/proprietary modes). Maybe just "serdes"?