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Date: Wed, 18 Mar 2026 15:27:44 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Christoph =?UTF-8?B?QsO2aG13YWxkZXI=?=
 <christoph.boehmwalder@linbit.com>
Cc: Philipp Reisner <philipp.reisner@linbit.com>, "David S. Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Paolo Abeni
 <pabeni@redhat.com>, Simon Horman <horms@kernel.org>, Alok Tiwari
 <alok.a.tiwari@oracle.com>, Kees Cook <kees@kernel.org>,
 netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] genetlink: add multi-version family support for
 protocol negotiation
Message-ID: <20260318152744.4f6d8c83@kernel.org>
In-Reply-To: <b17134a2-c95e-4019-800e-ab6ec6982ea3@linbit.com>
References: <20260316151507.3958299-2-christoph.boehmwalder@linbit.com>
	<20260316113736.1085a124@kernel.org>
	<085c9532-5440-4879-bcde-4d70c980c839@linbit.com>
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	<b17134a2-c95e-4019-800e-ab6ec6982ea3@linbit.com>
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On Wed, 18 Mar 2026 15:54:04 +0100 Christoph B=C3=B6hmwalder wrote:
> > I still feel a little bit in the dark as to what you're doing but the
> > normal path for Netlink is to add new attributes and commands in a
> > backward-compat manner. In case of DRBD given how "special" the
> > existing code is we could probably start a new family using modern
> > constructs. =20
>=20
> The new family indeed sounds like a way out. So we would register two
> families: the old "drbd" for the compat case, and a new "drbd2" with the
> new command set. Would that be more in line with the "standard approach"?

If we really can't keep backward compatibility then new family sounds
like the next best thing.