netdev - vxlan gso is broken by stackable gso

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Message-ID: <CAMEtUuxRhENE+OCFgdVASyVAaLo8AOdazUZdT+YHrcEzWA8Dow@mail.gmail.com>
Date:	Thu, 24 Oct 2013 16:37:52 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Eric Dumazet <edumazet@...gle.com>,
	Stephen Hemminger <stephen@...workplumber.org>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: vxlan gso is broken by stackable gso_segment()

Hi Eric, Stephen,

it seems commit 3347c960 "ipv4: gso: make inet_gso_segment() stackable"
broke vxlan gso

the way to reproduce:
start two lxc with veth and bridge between them
create vxlan dev in both containers
do iperf

this setup on net-next does ~80 Mbps and a lot of tcp retransmits.
reverting 3347c960 and d3e5e006 gets performance back to ~230 Mbps

I guess vxlan driver suppose to set encap_level ? Some other way?

Thanks
Alexei
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