linux-kernel - Re: [RFC PATCH net-next 6/7] net: ethtool: add a netlink command to get PHY information

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Message-ID: <20230908084606.5707e1b1@kernel.org>
Date:   Fri, 8 Sep 2023 08:46:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Nicolò Veronese <nicveronese@...il.com>,
        thomas.petazzoni@...tlin.com,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [RFC PATCH net-next 6/7] net: ethtool: add a netlink command to
 get PHY information

On Thu,  7 Sep 2023 11:24:04 +0200 Maxime Chevallier wrote:
>  	ETHTOOL_MSG_PHY_LIST_GET,
> +	ETHTOOL_MSG_PHY_GET,

The distinction between LIST_GET and GET is a bit odd for netlink.
GET has a do and a dump. The dump is effectively LIST_GET.

The dump can accept filtering arguments, like ifindex, if you want 
to narrow down the results, that's perfectly fine (you may need to
give up some of the built-in ethtool scaffolding, but it shouldn't 
be all that bad).