Nova-neutron-sriov
Contents
Nova: support Neutron SRIOV ports
Background
This blueprint is based on the discussions as documented in this wiki [[1]]
While the blueprint [[2]] addresses the common SR-IOV support in Nova, this blueprint attempts to capture the changes in Nova in order to support the neutron SR-IOV ports.
Traditionally, a neutron port is a virtual port that is either attached to a linux bridge or an openvswitch bridge on a compute node. With the introduction of SR-IOV, the intermediate virtual bridge is no longer required. Instead, the port is associated with a virtual function (VF) that is supported by the vNIC adaptor. In addition, the port may be extended to an upstream physical switch (IEEE 802.1br), and in such case, the port's configuration takes place in that switch. In this document, we use the term neutron SR-IOV port to refer to a VF that can be configured as an Ethernet interface.
A vNIC may be configured with multiple PFs, with each of them supporting the configuration of multiple VFs. This means that neutron SR-IOV ports are limited resources on a compute node. In addition, a neutron SR-IOV port is connected to a physical network, and different SR-IOV ports may be connected to different physical networks. Therefore, a VM that requires an SR-IOV port on a particular network needs to be placed on a compute node that supports neutron SR-IOV ports on that network. In this document, we will discuss an approach to enable this.
nova boot: Specify a neutron SR-IOV port
Given the limited time we have in Icehouse, we decided not to change the syntax of the nova boot API initially. In order to specify a neutron SR-IOV port for a VM, however, the semantics of the port-id parameter in the --nic option will be extended to support SR-IOV ports. With these blueprints, each neutron port will be associated with a binding:profile dictionary, in which the port's vnic-type and pci flavor are defined.
Scope of changes
- interpret the enhanced port-id parameter. For each neutron SR-IOV port, create a PCI request
- nova.network.neutronv2: changes required to support binding:profile
- vif dictionary: add vlan id.
- vif driver: add support to generate configs and interface XML for neutron SR-IOV ports for the vif types VIF_TYPE_802_QBG & VIF_TYPE_802_QBH
