Support interface attach with QoS ports

womax/nova

The following logic is added to the ComputeManager attach_interface
flow:

* gather the resource request of the port from neutron
* query allocation candidates restricted to the current compute node
  from placement
* extend the existing allocation of the instance with one of the
  allocation candidates in placement
* update the InstancePCIRequest (if any) to ensure that the PCI claim
  only allocates VF from the PF the placement resources are allocated from
* ensure that during port binding neutron gets the RP UUID, the resources
  are allocated from, in the allocation key of the binding profile

This patch bumps the compute service version to indicate that QoS
interface attach is supported. Also the check that was so far rejected
such attach is now updated to only reject it if the compute service
version is too old.

The "scheduling" during interface attach for PCI backed ports has the
same limitation as normal scheduling for such ports. It always selects
the first allocation candidate returned by placement even if later in
the process it turns out that such allocation candidate points to a PCI
PF that has no free VFs left.

Blueprint: support-interface-attach-with-qos-ports

Change-Id: Id4684093e8bdf3b61667490443e3d2f6ed65f4b3

This commit is contained in:

Balazs Gibizer

2020-10-09 15:56:56 +02:00

parent c3804efd42

commit 5af28c4de5

13 changed files with 944 additions and 28 deletions

									
										api-guide/source/port_with_resource_request.rst
									
		+3
		
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				@@ -36,5 +36,8 @@ same-cell resize if the server has such ports.

				As of 21.0.0 (Ussuri), nova supports evacuating, live migrating and unshelving

				servers with neutron ports having resource requests.

				As of 23.0.0 (Wallaby), nova supports attaching neutron ports having QoS

				minimum bandwidth rules.

				See :nova-doc:`the admin guide <admin/port_with_resource_request.html>` for

				administrative details.