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Message-ID: <20230908084108.36d0e23c@kernel.org>
Date: Fri, 8 Sep 2023 08:41:08 -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 0/7] net: phy: introduce phy numbering

On Thu,  7 Sep 2023 11:23:58 +0200 Maxime Chevallier wrote:
>  - the netlink API would need polishing, I struggle a bit with finding
>    the correct netlink design pattern to return variale-length list of u32.

Think of them as a list, not an array.

Dump them one by one, don't try to wrap them in any way:
https://docs.kernel.org/next/userspace-api/netlink/specs.html#multi-attr-arrays
People have tried other things in the past:
https://docs.kernel.org/next/userspace-api/netlink/genetlink-legacy.html#attribute-type-nests
but in the end they add constraints and pain for little benefit.

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