netdev - Re: [PATCH net-next] rtnetlink: Allow setting IFLA_PERM

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Message-ID: <20250213074039.23200080@kernel.org>
Date: Thu, 13 Feb 2025 07:40:39 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Toke Høiland-Jørgensen <toke@...hat.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] rtnetlink: Allow setting IFLA_PERM_ADDRESS at
 device creation time

On Thu, 13 Feb 2025 14:45:22 +0100 Toke Høiland-Jørgensen wrote:
> Eric suggested[0] allowing user-settable values for dev->perm_addr at
> device creation time, instead of mucking about with netdevsim to get a
> virtual device with a permanent address set.

I vote no. Complicating the core so that its easier for someone 
to write a unit test is the wrong engineering trade off.
Use a VM or netdevsim, that's what they are for.