From 4bcb877d257c87298aedead1ffeaba0d5df1991d Mon Sep 17 00:00:00 2001
From: Tom Herbert <therbert@google.com>
Date: Tue, 4 Nov 2014 09:06:52 -0800
Subject: [PATCH] udp: Offload outer UDP tunnel csum if available

In __skb_udp_tunnel_segment if outer UDP checksums are enabled and
ip_summed is not already CHECKSUM_PARTIAL, set up checksum offload
if device features allow it.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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