In Kernel 4.8 we introduced Traffic Control (TC see [1]) hardware offloads
framework for SR-IOV VFs which allows us to configure the NIC [2].
Subsequent OVS patches [3] allow us to use the TC framework
to offload OVS datapath rules. The feature is merged in ovs upstream. 

To allow the support in openstack we need the following changes:
os-vif - https://review.openstack.org/#/c/460278/
This patch adds plug/unplug when using ovs vif 'OVS_ACCELERATION'. The
plug method will lookup the VF representor and connect it to 'br-int',
while the unplug method will remove the VF representor from 'br-int'.

nova- https://review.openstack.org/#/c/398265/
This patch add support for  VIF_TYPE_OVS_ACCELERATION

neutron patches - https://review.openstack.org/#/c/275616/ & https://review.openstack.org/#/c/452530/
This patch allow OVS mech driver to bind direct (SR-IOV) port.
This will allow to offload the OVS flows using tc to the SR-IOV NIC
and gain accelerate OVS.

The current support is for ovs mechanism driver we will extend the support to other mechanism drivers such odl and ovn.


[1] https://linux.die.net/man/8/tc
[2] http://netdevconf.org/1.2/papers/efraim-gerlitz-sriov-ovs-final.pdf
[3] https://mail.openvswitch.org/pipermail/ovs-dev/2017-April/330606.html