netdev - Re: GSO with udp_tunnel_xmit

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Date:	Fri, 6 Nov 2015 12:48:15 +0100
From:	"Jason A. Donenfeld" <Jason@...c4.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	Jiri Benc <jbenc@...hat.com>, Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: GSO with udp_tunnel_xmit_skb

Hi Tom,

On Fri, Nov 6, 2015 at 8:19 AM, Tom Herbert <tom@...bertland.com> wrote:
> Is this about UFO or GSO (in email subject)? UFO should operate
> independently encapsulation or inner packet setting.

I suppose this is about UFO.

Specifically -- let's say I have a list of 500 skbs, which have their
data in place but don't yet have an IP or UDP header etc. I want to
send out these out using udp_tunnel_xmit_skb. Right now, if I just
send them all out, one after another, they don't seem to be getting
assembled into a super packet suitable for UFO. Instead, they're just
sent one at a time, and I get the vast majority of `perf top` CPU
usage in my ethernet card's driver and along the path to it -- the
problem that UFO is supposed to solve.

So my question is -- how can I make UFO happen with udp_tunnel_xmit_skb?

Thanks,
Jason
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