[RFE] OVS DPDK port representors support

[Hamdy Khader]

DPDK representors enable configuring a phy port to a guest (VM) machine.

OVS resides in the hypervisor which has one or more physical interfaces also known as the physical functions (PFs). If a PF supports SR-IOV it can be used to enable communication with the VMs via Virtual Functions (VFs). The VFs are virtual PCIe devices created from the physical Ethernet controller.

DPDK models a physical interface as a rte device on top of which an eth device is created. DPDK (version 18.xx) introduced the representors eth devices. A representor device represents the VF eth device (VM side) on the hypervisor side and operates on top of a PF. Representors are multi devices created on top of one PF.

The goal is to enable having dpdk port attached to instance as a direct port when the hypervisor datapath type is netdev.

Changes needed:

* Neutron:
return OVS VIF type in case of a direct port and a netdev databath.

* Nova:
In case of a port's OVS VIF type and a direct VNIC type, the datapath info must be set in the VIF profile as the VIF object is instantiated from VIFHostDevice class with profile of type VIFPortProfileOVSRepresentor.

* os-vif:
Do the plugging using the DPDK Representors syntax[1] in case of VIFHostDevice and a netdev databath.

[1] http://docs.openvswitch.org/en/latest/topics/dpdk/phy/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/658784
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=47390226f5c755a083b0f181f7a81b480069c8a9
Submitter: Zuul
Branch: master

commit 47390226f5c755a083b0f181f7a81b480069c8a9
Author: Hamdy Khader <email address hidden>
Date: Mon May 13 13:39:57 2019 +0300

    OVS DPDK port representors support

    Adds support for OVS DPDK port representors[1], a direct port on
    a netdev datapath is considered a DPDK representor port.

    get_vif_type returns OVS VIF type in case of a direct port.

    [1] http://docs.openvswitch.org/en/latest/topics/dpdk/phy/#representors

    Closes-Bug: #1829734
    Change-Id: I3956eeda19ebc93fdb0b13c1cfb3dc64abffee9f

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/os-vif 1.17.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 15.0.0.0b1 development milestone.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/os-vif 2.0.0 release.