linux-kernel - Re: [PATCH net-next 01/13] net: phy: Extract the speed/duplex to linkmode conversion from phylink

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Message-ID: <Z7x7p3W0ZpkFu44m@shell.armlinux.org.uk>
Date: Mon, 24 Feb 2025 14:01:11 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.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>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Simon Horman <horms@...nel.org>,
	Romain Gantois <romain.gantois@...tlin.com>
Subject: Re: [PATCH net-next 01/13] net: phy: Extract the speed/duplex to
 linkmode conversion from phylink

On Sat, Feb 22, 2025 at 03:27:13PM +0100, Maxime Chevallier wrote:
> Phylink uses MAC capabilities to represent the Pause, AsymPause, Speed
> and Duplex capabilities of a given MAC device. These capabilities are
> used internally by phylink for link validation and get a coherent set of
> linkmodes that we can effectively use on a given interface.
> 
> The conversion from MAC capabilities to linkmodes is done in a dedicated
> function, that associates speed/duplex to linkmodes.
> 
> As preparation work for phy_port, extract this logic away from phylink
> and have it in a dedicated file that will deal with all the conversions
> between capabilities, linkmodes and interfaces.

Fundamental question: why do you want to extract MAC capabilities from
phylink?

At the moment, only phylink uses the MAC capabilities (they're a phylink
thing.) Why should they be made generic, and what use will they be
applied to as something generic?

If there's no answer for that, then I worry that they'll get abused.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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