Configure a Citrix ADC VPX instance on KVM to use OVS DPDK-based host interfaces
September 14, 2021
Contributed by:
SC
You can configure a Citrix ADC VPX instance running on KVM (Fedora and RHOS) to use Open vSwitch (OVS) with Data Plane Development Kit (DPDK) for better network performance. This document describes how to configure the Citrix ADC VPX instance to operate on thevhost-userports exposed by OVS-DPDK on the KVM host.
OVSis a multilayer virtual switch licensed under the open-source Apache 2.0 license.DPDKis a set of libraries and drivers for fast packet processing.
The following Fedora, RHOS, OVS, and DPDK versions are qualified for configuring a Citrix ADC VPX instance:
Fedora
RHOS
Fedora 25
RHOS 7.4
OVS 2.7.0
OVS 2.6.1
DPDK 16.11.12
DPDK 16.11.12
Prerequisites
Before you install DPDK, make sure the host has 1 GB huge pages.
For more information, see thisDPDK system requirements documentation. Here is a summary of the steps required to configure a Citrix ADC VPX instance on KVM to use OVS DPDK-based host interfaces:
Install DPDK.
Build and Install OVS.
Create an OVS bridge.
Attach a physical interface to the OVS bridge.
Attachvhost-userports to the OVS data path.
Provision a KVM-VPX with OVS-DPDK basedvhost-userports.
Download OVS from the OVSdownload page. Next, build, and install OVS by using a DPDK datapath. Follow the instructions given in theInstalling Open vSwitchdocument.
ovs-vsctl add-port ovs-br0 dpdk0 -- set Interface dpdk0 type=dpdk options:dpdk-devargs=0000:03:00.0 ovs-vsctl add-port ovs-br0 dpdk1 -- set Interface dpdk1 type=dpdk options:dpdk-devargs=0000:03:00.1
Thedpdk-devargsshown as part of the options specifies the PCI BDF of the respective physical NIC.
Attachvhost-userports to the OVS data path
Type the following Fedora or RHOS commands to attachvhost-userports to the OVS data path:
Fedora command:
> $OVS_DIR/utilities/ovs-vsctl add-port ovs-br0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser -- set Interface vhost-user1 mtu_request=9000 > $OVS_DIR/utilities/ovs-vsctl add-port ovs-br0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuser -- set Interface vhost-user2 mtu_request=9000 chmod g+w /usr/local/var/run/openvswitch/vhost*
RHOS command:
ovs-vsctl add-port ovs-br0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser -- set Interface vhost-user1 mtu_request=9000 ovs-vsctl add-port ovs-br0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuser -- set Interface vhost-user2 mtu_request=9000 chmod g+w /var/run/openvswitch/vhost*
Provision a KVM-VPX with OVS-DPDK-basedvhost-userports
You can provision a VPX instance on Fedora KVM with OVS-DPDK-basedvhost-userports only from the CLI by using the following QEMU commands:Fedora command:
In the XML file, thehugepagesize must be 1 GB, as shown in the sample file.
Also, in the sample file vhost-user1 is thevhostuser port bound to ovs-br0.
To bring up the Citrix ADC VPX instance, start using thevirshcommand.
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