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ac2469077f
Updated the obsoleted instructions and scripts, based on Open vSwitch v2.13.1, DPDK stable v19.11.3, and Cloud Hypervisor v15.0 (on Ubuntu 20.04.1). Signed-off-by: Bo Chen <chen.bo@intel.com>
147 lines
5.8 KiB
Markdown
147 lines
5.8 KiB
Markdown
# How to test Vhost-user net with OpenVSwitch/DPDK
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The purpose of this document is to illustrate how to test vhost-user-net
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in cloud-hypervisor with OVS/DPDK as the backend. This document was
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tested with Open vSwitch v2.13.1, DPDK v19.11.3, and Cloud Hypervisor
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v15.0 on Ubuntu 20.04.1 (host kernel v5.4.0).
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## Framework
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It's a simple test to validate the communication between two virtual machine, connecting them to vhost-user ports respectively provided by `OVS/DPDK`.
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```
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+----+----------+ +-------------+-----------+-------------+ +----------+----+
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| | | | | | | | | |
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| |vhost-user|----------| vhost-user | ovs | vhost-user |----------|vhost-user| |
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| |net device| | port 1 | | port 2 | |net device| |
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| | | | | | | | | |
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| +----------+ +-------------+-----------+-------------+ +----------+ |
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| | | | | |
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|vm1 | | dpdk | | vm2 |
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| | | | | |
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+--+---------------------------------------------------------------------------------------------+--+
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| | hugepages | |
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| +---------------------------------------------------------------------------------------------+ |
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| host |
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+---------------------------------------------------------------------------------------------------+
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```
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## Prerequisites
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Prior to running the test, the following steps need to be performed.
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- Enable hugepages
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- Install DPDK
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- Install OVS
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Here is a good reference for setting up OVS with DPDK from scratch:
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https://docs.openvswitch.org/en/latest/intro/install/dpdk/.
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On Ubuntu systems (18.04 or newer), the OpenVswitch-DPDK package can be
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easily installed with:
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```bash
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sudo apt-get update
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sudo apt-get install openvswitch-switch-dpdk
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sudo update-alternatives --set ovs-vswitchd /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk
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```
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## Test
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The test runs with multiple queue (MQ) support enabled, using 2 pairs of
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TX/RX queues defined for both OVS and the virtual machine. Here are the
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detailed instructions.
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_Setup OVS_
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Here is an example how to configure a basic OpenVswitch using DPDK:
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```bash
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# load the ovs kernel module
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modprobe openvswitch
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sudo service openvswitch-switch start
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ovs-vsctl init
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ovs-vsctl set Open_vSwitch . other_config:dpdk-init=true
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# run on core 0-3 only
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ovs-vsctl set Open_vSwitch . other_config:dpdk-lcore-mask=0xf
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# allocate 2G huge pages (to NUMA 0 only)
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ovs-vsctl set Open_vSwitch . other_config:dpdk-socket-mem=1024
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# run PMD (Pull Mode Driver) threads on core 0-3 only
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ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0xf
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sudo service openvswitch-switch restart
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# double check the configurations
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ovs-vsctl list Open_vSwitch
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```
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Here is an example how to create a bridge and add two DPDK ports to it
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(for later use via Cloud Hypervisor):
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```bash
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# create a bridge
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ovs-vsctl add-br ovsbr0 -- set bridge ovsbr0 datapath_type=netdev
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# create two DPDK ports and add them to the bridge
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ovs-vsctl add-port ovsbr0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser
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ovs-vsctl add-port ovsbr0 vhost-user2 -- set Interface vhost-user2
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type=dpdkvhostuser
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# set the number of rx queues
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ovs-vsctl set Interface vhost-user1 options:n_rxq=2
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ovs-vsctl set Interface vhost-user2 options:n_rxq=2
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```
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_Launch the VMs_
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VMs run in client mode. They connect to the socket created by the `dpdkvhostuser` backend.
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```bash
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# From one terminal. We need to give the cloud-hypervisor binary the NET_ADMIN capabilities for it to set TAP interfaces up on the host.
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./cloud-hypervisor \
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--cpus boot=2 \
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--memory size=512M,hugepages=on,shared=true \
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--kernel vmlinux \
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--cmdline "console=ttyS0 console=hvc0 root=/dev/vda1 rw" \
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--disk path=focal-server-cloudimg-amd64.raw \
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--net mac=52:54:00:02:d9:01,vhost_user=true,socket=/var/run/openvswitch/vhost-user1,num_queues=4
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# From another terminal. We need to give the cloud-hypervisor binary the NET_ADMIN capabilities for it to set TAP interfaces up on the host.
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./cloud-hypervisor \
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--cpus boot=2 \
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--memory size=512M,hugepages=on,shared=true \
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--kernel vmlinux \
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--cmdline "console=ttyS0 console=hvc0 root=/dev/vda1 rw" \
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--disk path=focal-server-cloudimg-amd64.raw \
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--net mac=52:54:20:11:C5:02,vhost_user=true,socket=/var/run/openvswitch/vhost-user2,num_queues=4
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```
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_Setup VM1_
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```bash
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# From inside the guest
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sudo ip addr add 172.100.0.1/24 dev ens2
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sudo ip link set up dev ens2
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```
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_Setup VM2_
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```bash
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# From inside the guest
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sudo ip addr add 172.100.0.2/24 dev ens2
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sudo ip link set up dev ens2
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```
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_Ping VM1 from VM2_
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```bash
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# From inside the guest
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sudo ping 172.100.0.1
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```
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_Ping VM2 from VM1_
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```bash
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# From inside the guest
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sudo ping 172.100.0.2
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```
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__Result:__ At this point, VM1 and VM2 can ping each other successfully. We can now run `iperf3` test.
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_Run VM1 as server_
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```bash
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# From inside the guest
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iperf3 -s -p 4444
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```
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_Run VM2 as client_
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```bash
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# From inside the guest
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iperf3 -c 172.100.0.1 -t 30 -p 4444 &
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```
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