Enable SR-IOV physical functions assignment with Neutron port

Relying on the sriov-physical-function-passthrough spec
add network awareness to the physical functions passthough
by associating it with a Neutron port.

Implements blueprint sriov-pf-passthrough-neutron-port

Change-Id: I9aebc1bce867916f5bf5b5139850b67a151da123

specs/mitaka/approved/sriov_pf_neutron_port.rst

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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
+
+=============================================================
+Enable SR-IOV physical functions assignment with Neutron port
+=============================================================
+
+https://blueprints.launchpad.net/nova/+spec/sriov-pf-passthrough-neutron-port
+
+Relying on the sriov-physical-function-passthrough spec [1], which describes
+an implementation of a SR-IOV physical functions passthough support in Nova;
+This spec will address the need for SR-IOV physical functions to be
+associated with Neutron ports.
+
+
+Problem description
+===================
+
+Current implementation of the Physical Function (PF) passthrough lacks
+any network awareness. It is exposing the physical hardware to the instances
+without an integration with Neutron, unlike the way it is implemented for the
+SR-IOV Virtual Functions (VFs).
+
+Physical Function can only be exposed as a libvirt's <hostdev>
+definition in the domain XML and not as a "<interface type='hostdev'..."
+element that can receive a MAC address and a virtual port definition.
+
+In general, it is not possible to configure a MAC address for a PF, nor to
+assign a VLAN tag via it's driver on the host. Therefore, additional steps
+will be needed to update Neutron with an actual MAC address of a seleced PF.
+
+
+Use Cases
+----------
+
+Workloads requiring to have full access to a physical function will
+also need to have the ability to manipulate the network settings, in the
+same manner and flexibility that is currently available for VFs.
+
+
+Project Priority
+-----------------
+
+None
+
+Proposed change
+===============
+
+Allow the users to specify a new vnic_type, with the neutron port creation,
+which would be used by Nova to select a Physical Function on a host and
+properly passthrough it to a guest, using a new VIF type.
+Nova will update the neutron port with a MAC address of the selected PF
+on the host.
+
+Alternatives
+------------
+None
+
+Data model impact
+-----------------
+None
+
+REST API impact
+---------------
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+None
+
+Performance Impact
+------------------
+None
+
+Other deployer impact
+---------------------
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  Vladik Romanovsky <vromanso@redhat.com>
+
+Other contributors:
+  Nikola Đipanov <ndipanov@redhat.com>
+
+Work Items
+----------
+
+* Introduce a new vnic_type to request PF selection - VNIC_DIRECT_PHYSICAL
+* Introduce a new vif type to configure the PF attachment with as a hostdev.
+* Update the Neutron port with a MAC of a selected PF.
+
+
+Dependencies
+============
+
+* Depending on a neutron support of a new VNIC type.
+  https://review.openstack.org/#/c/246923
+  https://bugs.launchpad.net/neutron/+bug/1500993
+* There is also a dependency on the actual implementation of the
+  sriov-physical-function-passthrough spec [1]
+
+Testing
+=======
+New unit and functional tests will be written to cover the changes.
+
+Documentation Impact
+====================
+
+Documentation of a new vnic_type should be documented.
+
+References
+==========
+[1] https://review.openstack.org/#/c/212472
+
+History
+=======
+
+Optional section for Mitaka intended to be used each time the spec
+is updated to describe new design, API or any database schema
+updated. Useful to let reader understand what's happened along the
+time.
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Mitaka
+     - Introduced