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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+==========================================
+Adding OVS Hardware Offload to TripleO
+==========================================
+
+https://blueprints.launchpad.net/tripleo/+spec/tripleo-ovs-hw-offload
+
+OVS Hardware Offload leverages SR-IOV technology to control the SR-IOV
+VF using VF representor port. OVS 2.8.0 supports the hw-offload option which
+allows to offload OVS datapath rule to hardware using linux traffic control
+tool and the VF representor port. This feature accelerates the OVS
+with a SR-IOV NIC which support switchdev mode.
+
+Problem Description
+===================
+
+Today the installation and configuration of OVS hardware offload feature is
+done manually after overcloud deployment. It shall be automated via tripleo.
+
+Proposed Change
+===============
+
+Overview
+--------
+
+* Configure the SR-IOV NIC to be in switchdev mode using the following
+  syntax <physical_interface>:<numvfs>:<mode> for NeutronSriovNumVFs.
+  mode can be legacy or switchdev
+* Configure the OVS with other_config:hw-offload. The options can
+  be added for the cluster without side effects, because if then NIC doesn't
+  support OVS will fall-back to kernel datapath.
+
+* Nova scheduler should be configured to use the PciPassthroughFilter
+  (same SR-IOV)
+* Nova compute should be configured with passthrough_whitelist (same SR-IOV)
+
+Alternatives
+------------
+
+None
+
+Security Impact
+---------------
+
+None
+
+Other End User Impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+* OVS Hardware Offload leverage the SR-IOV technology to provides near
+  native I/O performance for each virtual machine that managed by OpenVswitch.
+
+Other Deployer Impact
+---------------------
+
+* The operator shall ensure that the BIOS supports VT-d/IOMMU virtualization
+  technology on the compute nodes.
+
+* IOMMU needs to be enabled in the Compute+SR-IOV nodes. Boot parameters
+  (intel_iommu=on or  amd_iommu=pt) shall be added in the grub.conf, using the
+  PreNetworkConfig.
+
+* Post deployment, operator shall
+
+  * Create neutron ports prior to creating VM’s (nova boot)
+    openstack port create --vnic-type direct --binding-profile '{"capabilities": ["switchdev"]}' port1
+
+  * Create the VM with the required flavor and SR-IOV port id
+    openstack server create --image cirros-mellanox_sriov --port=port1 --flavor m1.tiny vm_a1
+
+Developer Impact
+----------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  waleedm (waleedm@mellanox.com
+
+Other contributors:
+  moshele (moshele@mellanox.com)
+
+Work Items
+----------
+
+* Update tripleo::host::sriov::numvfs_persistence to allow configure SR-IOV
+  in switchdev mode. extending the vf_defs to
+  <physical_interface>:<numvfs>:<mode>. Mode can be legacy which is default
+  SR-IOV or switchdev which is used for ovs hardware offload.
+* Add a template parameter called NeutronOVSHwOffload to enable.
+* provide environment YAML for OVS hardware offload in tripleo-heat-templates.
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+* Since SR-IOV needs specific hardware support, this feature can be tested
+  under third party CI. We hope to provide Mellanox CI to SR-IOV and this
+  feature.
+
+Documentation Impact
+====================
+
+None
+
+References
+==========
+
+* Introduction to SR-IOV
+  http://goo.gl/m7jP3
+
+* SR-IOV OVS hardware offload netdevconf
+  http://netdevconf.org/1.2/papers/efraim-gerlitz-sriov-ovs-final.pdf
+
+* OVS hardware offload in OpenVswitch
+  https://mail.openvswitch.org/pipermail/ovs-dev/2017-April/330606.html
+
+* OpenStack OVS mechanism driver support in neutron/nova/os-vif
+  https://review.openstack.org/#/c/398265/
+  https://review.openstack.org/#/c/275616/
+  https://review.openstack.org/#/c/460278/