From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH v2 iproute2 4/5] ip link: Add support for remote
 checksum offload
Date: Thu, 6 Nov 2014 16:14:45 -0800
Message-ID: <20141106161445.78bdd512@urahara>
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Cc: davem@davemloft.net, netdev@vger.kernel.org
To: Tom Herbert <therbert@google.com>
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On Wed,  5 Nov 2014 10:06:27 -0800
Tom Herbert <therbert@google.com> wrote:

> This patch adds support to remote checksum checksum offload
> confinguration for IPIP, SIT, and GRE tunnels. This patch
> adds a [no]encap-remcsum to ip link command which applicable
> when configured tunnels that use GUE.
> 
> http://tools.ietf.org/html/draft-herbert-remotecsumoffload-00
> 
> Example:
> 
> ip link add name tun1 type gre remote 192.168.1.1 local 192.168.1.2 \
>    ttl 225 encap fou encap-sport auto encap-dport 7777 encap-csum \
>    encap-remcsum
> 
> This would create an GRE tunnel in GUE encapsulation where the source
> port is automatically selected (based on hash of inner packet),
> checksums in the encapsulating UDP header are enabled (needed.for
> remote checksum offload), and remote checksum is configured to
> be used on the tunnel (affects TX side).
> 
> Signed-off-by: Tom Herbert <therbert@google.com>
> ---
>  include/linux/if_tunnel.h |  1 +

This patch is for net-next not current release
Remote checksum offload flag does not exist in upstream tree (net or linus).

Please don't mix patches for current and future releases together.