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Date:	Fri, 13 Jun 2014 18:59:06 -0700
From:	Tom Herbert <>
To:	Joseph Gasparakis <>
Cc:	Linux Netdev List <>,
	"Brandeburg, Jesse" <>
Subject: Re: No GSOs to i40e with VXLAN

On Fri, Jun 13, 2014 at 5:15 PM, Joseph Gasparakis
<> wrote:
> Hi all,
> I quickly tested VXLAN on i40e with net-next with commit id
> f9da455b93f6ba076935b4ef4589f61e529ae046 and the i40e driver has stopped
> receiving GSOs even when advertising tx-udp_tnl-segmentation which means
> our VXLAN segmentation offload. I am guessing this has something to do
> with Tom's recent UDP work but this is just a guess as unfortunatly I
> do not have the time to debug this, but I am signing up to review and test
> patches fixing this issue.
I verified tunnel offload works properly with bnx2x (I'm using simple
vxlan interfaces not OVS).

One possibility I can think of is that UDP checksums are somehow
enabled. If you're using IPv6 this probably the case (but I assume
you're seeing this with IPv4). If checksums are inadvertently enabled
somehow in IPv4 this should should up in tcpdump on the Ethernet


> The driver still gets GSOs with non VXLAN traffic (tested with TCP).
> Thanks
> Joseph
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