netdev - Re: [PATCH 3/3] sfc: selftest: fix struct packing

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Message-ID: <0f12f612-7fad-59c6-c7dd-dea49721842b@gmail.com>
Date: Fri, 23 Jun 2023 13:57:39 +0100
From: Edward Cree <ecree.xilinx@...il.com>
To: David Laight <David.Laight@...LAB.COM>, Arnd Bergmann <arnd@...nel.org>,
 Martin Habets <habetsm.xilinx@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Arnd Bergmann <arnd@...db.de>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-net-drivers@....com" <linux-net-drivers@....com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] sfc: selftest: fix struct packing

On 23/06/2023 11:52, David Laight wrote:
> Maybe you can get away with adding a 16bit pad before the ethernet
> header so that the IP header is actually aligned.

That's what I ended up doing, because my original idea was
 overcomplicated and turned out super ugly.
See https://lore.kernel.org/netdev/6f87fdf5-1844-4633-b4fe-6b247bc6ab49@app.fastmail.com/T/

> (Then fight all the stuff that stops you doing a memcpy()
> that runs into a second field of a structure.)

Yeah, I don't know how you're meant to annotate that stuff.
I guess I'll have to wait until Kees shouts at me and tells
 me what to do :S

-ed