netdev - Re: [EXTERNAL] [PATCH] netpoll: support sending over raw IP interfaces

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Date: Thu, 21 Mar 2024 13:33:17 +0100
From: Mark <mark@...suba.nl>
To: Ratheesh Kannoth <rkannoth@...vell.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 Hans de Goede <hdegoede@...hat.com>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 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" <linux-kernel@...r.kernel.org>
Subject: Re: [EXTERNAL] [PATCH] netpoll: support sending over raw IP
 interfaces

Hi Ratheesh,

> Op 18 mrt 6 Reiwa, om 15:06 heeft Ratheesh Kannoth <rkannoth@...vell.com> het volgende geschreven:
> 
>> […]
> Is below network topology possible ?  
> Netpoll()- ------> netdev A ----> raw interface 
> Where netdev A's  netdev->header_ops != NULL

I believe so, this is not uncommon in tunnel devices like gretap.
However, those fully encapsulate the link layer header in the packet
to the lower interface. I am not aware of a interface driver that removes
a header upon xmit, so to speak. However, I have just posted a v2 that
instead uses the documented `dev_has_header()` API, which seems to fit the
check exactly, here:

https://lore.kernel.org/netdev/20240321122003.20089-1-mark@yotsuba.nl/T/

I hope this change manages to mitigate your concerns. :-)

> […]

Thanks and regards,
Mark