linux-kernel - Re: [PATCH ethtool-next v2 3/3] ethtool: Introduce a command to list PHYs

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Message-ID: <7fpbxztptolcuz4ppppkmpmblel7mv4nh4jgkjqbdedo4hrcjc@6oo6acqfejas>
Date: Mon, 2 Sep 2024 00:07:56 +0200
From: Michal Kubecek <mkubecek@...e.cz>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>, 
	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>, 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 ethtool-next v2 3/3] ethtool: Introduce a command to list
 PHYs

On Wed, Aug 28, 2024 at 05:25:10PM +0200, Maxime Chevallier wrote:
> It is now possible to list all Ethernet PHYs that are present behind a
> given interface, since the following linux commit :
> 63d5eaf35ac3 ("net: ethtool: Introduce a command to list PHYs on an interface")
> 
> This command relies on the netlink DUMP command to list them, by allowing to
> pass an interface name/id as a parameter in the DUMP request to only
> list PHYs on one interface.
> 
> Therefore, we introduce a new helper function to prepare a interface-filtered
> dump request (the filter can be empty, to perform an unfiltered dump),
> and then uses it to implement PHY enumeration through the --show-phys
> command.
> 
> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> ---
[...]
> diff --git a/netlink/extapi.h b/netlink/extapi.h
> index c882295..fd99610 100644
> --- a/netlink/extapi.h
> +++ b/netlink/extapi.h
> @@ -56,6 +56,7 @@ int nl_set_mm(struct cmd_context *ctx);
>  int nl_gpse(struct cmd_context *ctx);
>  int nl_spse(struct cmd_context *ctx);
>  int nl_flash_module_fw(struct cmd_context *ctx);
> +int nl_get_phy(struct cmd_context *ctx);
>  
>  void nl_monitor_usage(void);
>  

Please add also a fallback to !ETHTOOL_ENABLE_NETLINK branch, similar
to other netlink handlers, so that a build with --disable-netlink does
not fail.

Michal

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