netdev - Re: [net] i40e: fix offload of GRE tunnels

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Date:	Mon, 05 Oct 2015 04:32:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	jesse.brandeburg@...el.com, netdev@...r.kernel.org,
	nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com
Subject: Re: [net] i40e: fix offload of GRE tunnels

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Thu,  1 Oct 2015 18:25:42 -0700

> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> 
> The driver still was not offloading TSO on GRE tunnels because
> it forgot to set the GSO_GRE flag, causing lots of retransmits.
> 
> This fixes generic GRE traffic (like a tunnel added like below)
> whereas before it would get 1Gb/s or less, now on a 10G adapter
> it gets 8.7Gb/s.
> 
> ip ad ad 11.1.0.2/24 dev ens2f0
> ip l set ens2f0 up
> ip link add gre2 type gretap remote 11.1.0.1 local 11.1.0.2 dev ens2f0
> ip l set gre2 up
> ip ad ad 192.168.124.2/24 dev gre2
> ping 192.168.124.1
> netperf -H 192.168.124.1
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied, thanks.
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