netdev - Not BUG, feature :) af_packet fails to TX TSO frames

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Message-ID: <1b445a1b-12bc-5e36-50ba-3a683b7096e2@cambridgegreys.com>
Date:   Fri, 13 Oct 2017 08:25:29 +0100
From:   Anton Ivanov <anton.ivanov@...bridgegreys.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>
Subject: Not BUG, feature :) af_packet fails to TX TSO frames

Let's reset this one.

I cannot say I am happy with the current number of caveats on using 
this. We should at least throw a small page similar to the one dedicated 
to tpacket_v2 into the kernel docs (or amend the offload docs). As I do 
not know all the corner cases well enough I find it difficult to 
volunteer on this one, it should be someone more familiar with the code. 
If they are documented, we can say that this is not a bug, it is a 
feature :)

What I can volunteer on is contributing some code to the actual 
af_packet.c. When I did the digging in the source, I noticed that tap 
has an unfair advantage over raw by allowing the user to specify buffers 
from userspace. I am happy to port that, test it and contribute it.

-- 
Anton R. Ivanov

Cambridge Greys Limited, England and Wales company No 10273661
http://www.cambridgegreys.com/