[ovs-discuss] ovs not triggering vxlan offload

[Jesse Gross]

On Thu, Sep 10, 2015 at 7:36 PM, Xu (Simon) Chen <xchenum at gmail.com> wrote:
> Hello,
>
> I am testing OVS 2.4.0 on Linux 3.18 kernel.
>
> Not sure when it got changed, but VXLAN offload is no longer on by
> default in 3.18 - it used to be the case in 3.14. So, normally I have:
> ethtool -k eth4 | grep tnl
> tx-udp_tnl-segmentation: off [fixed]
>
> Configuring a VXLAN interface manually would trigger that option to
> turn on. Something like:
> ip link add vxlan0 type vxlan id 11 group 239.1.1.1 dev eth4
> ip addr add 1.2.4.5/24 dev vxlan0
> ip link set up vxlan0
>
> Then we have:
> ethtool -k eth4 | grep tnl
> tx-udp_tnl-segmentation: on [requested off]
>
> I imagined that when OVS created the VXLAN tunneled ports, it should
> turn on VXLAN offload as well, but it's not happening.

This was reported just yesterday:
http://openvswitch.org/pipermail/discuss/2015-September/018714.html

I'm assuming that this is with the out of tree OVS kernel module. In
that case, the change is in OVS 2.4 and shouldn't be a difference
between Linux 3.14 and 3.18.