netdev - Re: [PATCH RESEND] net: add config option for tunnel fallback devs

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Message-ID: <20241014172602.7c55a4d4@kernel.org>
Date: Mon, 14 Oct 2024 17:26:02 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Lorenz Brun <lorenz@...ogon.tech>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] net: add config option for tunnel fallback devs

On Wed,  9 Oct 2024 13:04:19 +0200 Lorenz Brun wrote:
> This adds a Kconfig option to set the default behavior regarding tunnel
> fallback devices.
> For setups where the initial namespace should also not have these, the
> only preexisting option is to use a kernel command line option which
> needs to be passed to every kernel invocation, which can be inconvenient
> in certain setups.
> If a kernel is built for a specific environment this knob allows
> disabling the compatibility behavior outright, without requiring any
> additional actions.

I don't hate the idea, but could you comment a bit more on practical
usability of such a change? Whatever software depends on the new
behavior will likely not work with distro kernels, right?

Did you consider kernel boot param?