linux-kernel - Re: [PATCH net-next] net: create a dummy net

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Date: Tue, 2 Apr 2024 21:01:55 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	quic_jjohnson@...cinc.com, kvalo@...nel.org,
	dennis.dalessandro@...nelisnetworks.com,
	Jiri Pirko <jiri@...nulli.us>, Simon Horman <horms@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Coco Li <lixiaoyan@...gle.com>,
	"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Dennis Dalessandro <dennis.dalessandro@...el.com>,
	RDMA mailing list <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH net-next] net: create a dummy net_device allocator

On Wed, Mar 27, 2024 at 01:08:04PM -0700, Breno Leitao wrote:
> It is impossible to use init_dummy_netdev together with alloc_netdev()
> as the 'setup' argument.

<...>

> Also, create a helper to allocate and initialize dummy net devices,
> leveraging init_dummy_netdev_core() as the setup argument. 

<...>

> Suggested-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Breno Leitao <leitao@...ian.org>

Exciting read for people who remember this conversation:
"""
> I prefer to see some new wrapper over plain alloc_netdev, which will
> create this dummy netdevice. For example, alloc_dummy_netdev(...).

Nope, no bona fide APIs for hacky uses.
"""
https://lore.kernel.org/linux-rdma/20240311112532.71f1cb35@kernel.org/

Thanks