netdev - Re: [PATCH net-next v4 05/15] net: phy: Create a phy

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Message-ID: <5d618829-a9bc-4dd4-8a2e-6ce3a4acd51e@lunn.ch>
Date: Mon, 17 Feb 2025 14:43:00 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...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>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Marek Behún <kabel@...nel.org>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Nicolò Veronese <nicveronese@...il.com>,
	Simon Horman <horms@...nel.org>, mwojtas@...omium.org,
	Antoine Tenart <atenart@...nel.org>, devicetree@...r.kernel.org,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Romain Gantois <romain.gantois@...tlin.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Dimitri Fedrau <dimitri.fedrau@...bherr.com>,
	Sean Anderson <seanga2@...il.com>
Subject: Re: [PATCH net-next v4 05/15] net: phy: Create a phy_port for
 PHY-driven SFPs

> One way to avoid that would be to extract out of phylink/phylib all the
> functions for linkmode handling that aren't tied to phylink/phylib
> directly, but are about managing the capabilities of each interface,
> linkmode, speed, duplex, etc. For phylink, that would be :
> 
> phylink_merge_link_mode
> phylink_get_capabilities
> phylink_cap_from_speed_duplex
> phylink_limit_mac_speed
> phylink_caps_to_linkmodes
> phylink_interface_max_speed
> phylink_interface_signal_rate
> phylink_is_empty_linkmode
> phylink_an_mode_str
> phylink_set_port_modes

...

> These would go into linkmode.c/h for example, and we'd have a shared set
> of helpers that we can use in phylink, phylib and phy_port.

Please be careful with the scope of these. Heiner is going through
phylib and trying to reduce the scope of some of the functions we
exporting in include/linux/phy.h to just being available in
drivers/net/phy. That will help stop MAC drivers abuse them. We should
do the same here, limit what can actually use these helpers to stop
abuse.

	Andrew