Add NovaLibvirtMaxQueues role parameter to set [libvirt]/max_queues

Add NovaLibvirtMaxQueues role parameter to set [libvirt]/max_queues in
nova.conf of the compute. Default 0 corresponds to not set meaning the
legacy limits based on the reported kernel major version will be used.

Depends-On: Ieaa29b51257f5ea3a5e4d6c678140fd9ae052d88
Change-Id: I353e8ca2676bbdceb056f8b2b084bc5102f52c1f

deployment/nova/nova-compute-container-puppet.yaml

@@ -548,6 +548,17 @@ parameters:
     default: []
     tags:
       - role_specific
+  NovaLibvirtMaxQueues:
+    type: number
+    description: >
+      Add parameter to configure the libvirt max_queues. The maximum number
+      of virtio queue pairs that can be enabled when creating a multiqueue guest.
+      The number of virtio queues allocated will be the lesser of the CPUs
+      requested by the guest and the max value defined.
+      Default 0 corresponds to not set
+    default: 0
+    tags:
+      - role_specific
 
   # DEPRECATED: the following options are deprecated and are currently maintained
   # for backwards compatibility. They will be removed in future release.
@@ -744,6 +755,8 @@ resources:
               NovaImageTypeExcludeList: {get_param: NovaImageTypeExcludeList}
               NovaLiveMigrationPermitPostCopy: {get_param: NovaLiveMigrationPermitPostCopy}
               NovaLiveMigrationPermitAutoConverge: {get_param: NovaLiveMigrationPermitAutoConverge}
+              NovaLibvirtMaxQueues: {get_param: NovaLibvirtMaxQueues}
+
 
 conditions:
   enable_instance_ha: {equals: [{get_param: EnableInstanceHA}, true]}
@@ -804,6 +817,12 @@ conditions:
       - equals: [{get_param: [RoleParameters, NovaLiveMigrationPermitAutoConverge]}, '']
       - equals: [{get_param: NovaLiveMigrationPermitAutoConverge}, '']
 
+  nova_libvirt_max_queues_set:
+    not:
+      or:
+      -  equals: [{get_param: NovaLibvirtMaxQueues}, 0]
+      -  equals: [{get_param: [RoleParameters, NovaLibvirtMaxQueues]}, 0]
+
 outputs:
   role_data:
     description: Role data for the Nova Compute service.
@@ -921,6 +940,11 @@ outputs:
               - libvirt_file_backed_memory_enabled
               - '1.0'
               - {get_attr: [RoleParametersValue, value, 'nova::ram_allocation_ratio']}
+          -
+            if:
+            - nova_libvirt_max_queues_set
+            - nova::compute::libvirt::max_queues: {get_attr: [RoleParametersValue, value, nova_libvirt_max_queues]}
+            - {}
       service_config_settings:
         rsyslog:
           tripleo_logging_sources_nova_compute:

releasenotes/notes/nova_libvirt_max_queues-8024fc63105bd25d.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Add NovaLibvirtMaxQueues role parameter to set [libvirt]/max_queues in
+    nova.conf of the compute. Default 0 corresponds to not set meaning the
+    legacy limits based on the reported kernel major version will be used.