netdev - Re: [PATCH net-next v5 07/13] net: ethtool: Introduce a command to list PHYs on an interface

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Date: Wed, 24 Jan 2024 17:54:53 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com, 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>,
	Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net-next v5 07/13] net: ethtool: Introduce a command to
 list PHYs on an interface

> > Another option might be to add PHY support to netdevsim. Add a debugfs
> > interface to allow you to create arbitrary PHY topologies? You can
> > then even add a test script.
> 
> Sorry for the delayed answer, I just took a few hours to give it a try,
> and I was able to spin some very basic PHY support for the netdevsim,
> allowing to attach arbitrary instances of fixed_phy devices. I can
> therefore use that as a mean of testing the dump operation, I'll try to
> include that in the next iteration, that should pave the way for some
> testability of more PHY stuff hopefully.

Great that you looked at this.

FYI: Jakub would like to see changes to netdevsim accompanied with
self tests making you of the features you add. There is also now a
build bot running the self tests against net-next, so these tests
should get run quite frequently.

       Andrew