netdev - Re: [PATCH net-next v4 13/13] Documentation: networking: document phy_link

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Date: Mon, 18 Dec 2023 11:10:29 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: 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>,
	Russell King <linux@...linux.org.uk>,
	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>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jonathan Corbet <corbet@....net>,
	Marek Behún <kabel@...nel.org>,
	Piergiorgio Beruto <piergiorgio.beruto@...il.com>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Nicolò Veronese <nicveronese@...il.com>
Subject: Re: [PATCH net-next v4 13/13] Documentation: networking: document
 phy_link_topology

> +An Ethernet Interface from userspace's poing of view is nothing but a

point

> +:c:type:`struct net_device <net_device>`, which exposes configuration options
> +trough the legacy ioctls and the ethool netlink commands. The base assumption

through 

> +when designing these configuration channels were that the link looked
> +something like this ::
> +
> +  +-----------------------+        +----------+      +--------------+
> +  | Ethernet Controller / |        | Ethernet |      | Connector /  |
> +  |       MAC             | ------ |   PHY    | ---- |    Port      | ---... to LP
> +  +-----------------------+        +----------+      +--------------+
> +  struct net_device               struct phy_device
> +
> +Commands that needs to configure the PHY will go through the net_device.phydev
> +field to reach the PHY and perform the relevant configuration.
> +
> +This assumption falls appart in more complex topologies that can arise when,

apart.

	Andrew