netdev - Re: [PATCH net-next v2 7/9] net: phy: introduce ethtool_phy

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Message-ID: <20241008191958.712a2f51@device-21.home>
Date: Tue, 8 Oct 2024 19:19:58 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, davem@...emloft.net,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 thomas.petazzoni@...tlin.com, Jakub Kicinski <kuba@...nel.org>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 linux-arm-kernel@...ts.infradead.org, Christophe Leroy
 <christophe.leroy@...roup.eu>, Herve Codina <herve.codina@...tlin.com>,
 Florian Fainelli <f.fainelli@...il.com>, Heiner Kallweit
 <hkallweit1@...il.com>, Vladimir Oltean <vladimir.oltean@....com>, Marek
 Behún <kabel@...nel.org>, Köry Maincent
 <kory.maincent@...tlin.com>, Oleksij Rempel <o.rempel@...gutronix.de>
Subject: Re: [PATCH net-next v2 7/9] net: phy: introduce ethtool_phy_ops to
 get and set phy configuration

On Tue, 8 Oct 2024 18:05:05 +0100
"Russell King (Oracle)" <linux@...linux.org.uk> wrote:

> > What I mean is the ability for users to see, from tools like ethtool,
> > that the MCBin doubleshot's eth0 and eth1 interfaces have 2 ports
> > (copper + sfp), and potentially allow picking which one to use in case
> > both ports are connected.
> > 
> > There are mutliple devices out-there with such configurations (some
> > marvell switches for example). Do you not see some value in this ?  
> 
> Many PHYs that have two media facing ports give configuration of the
> priority between the two interfaces, and yes, there would definitely be
> value in exposing that to userspace, thereby allowing userspace to
> configure the policy there.

Great !

> This would probably be more common than the two-PHY issue that we're
> starting with - as I believe the 88e151x PHYs support exactly the same
> thing when used with a RGMII host interface. The serdes port becomes
> available for "fiber" and it is only 1000base-X there.

True, I've seen several setups with this so far indeed, as well as with
PHYs from other vendors.

> I was trying to work out what the motivation was for this platform.

It also turns out that the MCBin is one of the only boards that has a
permanent spot on my desk, as it's a pretty nice platform to experiment
with various PHY aspects.

> 
> Sorry if you mentioned it at NetdevConf and I've forgotten it all,
> it was quite a while ago now!

No worries :)

> 
> Thanks!

Thanks for your feedback on that whole topic,

Maxime