linux-kernel - Re: [PATCH] netpoll: support sending over raw IP interfaces

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Date: Thu, 14 Mar 2024 11:34:55 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Mark Cilissen <mark@...suba.nl>
Cc: netdev@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>, Eric
 Dumazet <edumazet@...gle.com>, Breno Leitao <leitao@...ian.org>, Ingo
 Molnar <mingo@...hat.com>, "David S. Miller" <davem@...emloft.net>, Paolo
 Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netpoll: support sending over raw IP interfaces

On Wed, 13 Mar 2024 13:46:13 +0100 Mark Cilissen wrote:
> Currently, netpoll only supports interfaces with an ethernet-compatible
> link layer. Certain interfaces like SLIP do not have a link layer
> on the network interface level at all and expect raw IP packets,
> and could benefit from being supported by netpoll.
> 
> This commit adds support for such interfaces by using the network device's
> `hard_header_len` field as an indication that no link layer is present.
> If that is the case we simply skip adding the ethernet header, causing
> a raw IP packet to be sent over the interface. This has been confirmed
> to add netconsole support to at least SLIP and WireGuard interfaces.

Would be great if this could come with a simple selftest under
tools/testing/selftests/net. Preferably using some simple tunnel
device, rather than wg to limit tooling dependencies ;)