6b2c15c3b8
QoS support for PTs inside PTG, as 2 new NSP param types. The new NSP param types, qos_maxrate and qos_burstrate, map to the Neutron QoS Policy resource, which then gets associated to a QoS bandwith limit rule with a certain maximum rate and/or burst rate (in Kbps) set. Change-Id: I4a15daf5e0edd76d2d436eac6fdfb6b9f64992b2
2.3 KiB
Neutron QoS Support
Quality of Service (QoS) support is available in GBP using the Neutron API (via the GBP Neutron Resource Mapping Driver).
This feature can be used by creating Network Service Policies (NSP) with the following NSP parameter types: - `qos_maxrate`: maximum bandwidth limiting rate for a Policy Target (in Kbps) - `qos_burstrate`: burst bandwidth limiting rate for a Policy Target (in Kbps)
When a NSP contains one or both of the previous parameter types, and is associated to a Policy Target Group (PTG), all Policy Targets part of that PTG will individually inherit the QoS definitions intended. In other words, each Policy Target will have their bandwidth limited by the amounts specified in qos_maxrate and qos_burstrate, independently of the network activity in other Policy Targets of the same PTG.
The QoS NSP parameter types expect a numerical value bound by Neutron's QoS.
Resource Mapping Driver
When a NSP contains one or both of the supported parameter types, and a respective numerical value, the Resource Mapping Driver will automatically be called to create one QoS Policy resource and one QoS Bandwidth Limit Rule resource, via Neutron's REST API.
The Resource Mapping Driver includes the NSP Manager as a mixin, which provides the data model and methods for creating mappings from GBP to QoS resources in Neutron, as explained in more detail below.
This driver also handles the association of each Policy Target (part of a PTG having a NSP that includes QoS parameters) to the actual QoS Policies that have been created in Neutron. The Neutron Ports already mapped to Policy Targets will be updated to include the correct Neutron QoS Policy that was previously created and mapped to GBP.
NSP Manager
A special resource exists in GBP, ServicePolicyQosPolicyMapping, which keeps track of the mapping between NSPs in GBP and QoS Policies in Neutron, and is specifically defined inside the NSP Manager file (nsp_manager.py).
Furthermore, NetworkServicePolicyMappingMixin includes the database operations for creating, deleting and reading these mappings.
DevStack Support
The GBP DevStack plugin will automatically enable QoS support.