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+# How to test Vhost-user net with OpenVSwitch/DPDK
+
+The purpose of this document is to illustrate how to test vhost-user-net in cloud-hypervisor with OVS/DPDK as the backend.
+
+## Framework
+
+It's a simple test to validate the communication between two virtual machine, connecting them to vhost-user ports respectively provided by `OVS/DPDK`.
+```
+             +----+----------+          +-------------+-----------+-------------+          +----------+----+  
+             |    |          |          |             |           |             |          |          |    | 
+             |    |vhost-user|----------| vhost-user  |   ovs     | vhost-user  |----------|vhost-user|    |           
+             |    |net device|          | port 1      |           | port 2      |          |net device|    |           
+             |    |          |          |             |           |             |          |          |    |           
+             |    +----------+          +-------------+-----------+-------------+          +----------+    |           
+             |               |          |                                       |          |               |           
+             |vm1            |          |                  dpdk                 |          |           vm2 |           
+             |               |          |                                       |          |               |           
+          +--+---------------------------------------------------------------------------------------------+--+        
+          |  |                                       hugepages                                             |  |        
+          |  +---------------------------------------------------------------------------------------------+  |        
+          |                                                                                                   |        
+          |                                              host                                                 |        
+          |                                                                                                   |  
+          +---------------------------------------------------------------------------------------------------+        
+```
+## Prerequisites
+
+Prior to running the test, the following steps need to be performed.
+- Enable hugepages
+- Install DPDK
+- Install OVS
+
+Here are some good references for detailing them.
+- Red Hat
+	* https://wiki.qemu.org/Documentation/vhost-user-ovs-dpdk
+- Ubuntu server
+	* https://help.ubuntu.com/lts/serverguide/DPDK.html
+	* https://software.intel.com/en-us/articles/set-up-open-vswitch-with-dpdk-on-ubuntu-server
+
+## Test
+The test runs with multiple queue (MQ) support enabled, using 2 pairs of TX/RX queues defined for both OVS and the virtual machine. Here are the details on how the test can be run.
+
+_Setup OVS_
+
+`ovs_test.sh` is created to setup and start OVS. OVS will provide the `dpdkvhostuser` backend running in server mode.
+```bash
+mkdir -p /var/run/openvswitch
+modprobe openvswitch
+killall ovsdb-server ovs-vswitchd
+rm -f /var/run/openvswitch/vhost-user*
+rm -f /etc/openvswitch/conf.db
+export DB_SOCK=/var/run/openvswitch/db.sock
+ovsdb-tool create /etc/openvswitch/conf.db /usr/share/openvswitch/vswitch.ovsschema
+ovsdb-server --remote=punix:$DB_SOCK --remote=db:Open_vSwitch,Open_vSwitch,manager_options --pidfile --detach
+ovs-vsctl --no-wait init
+ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-lcore-mask=0xf
+ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-socket-mem=1024
+ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true
+ovs-vsctl --no-wait set Open_vSwitch . other_config:pmd-cpu-mask=0xf
+ovs-vswitchd unix:$DB_SOCK --pidfile --detach --log-file=/var/log/openvswitch/ovs-vswitchd.log
+ovs-vsctl add-br ovsbr0 -- set bridge ovsbr0 datapath_type=netdev
+ovs-vsctl add-port ovsbr0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser
+ovs-vsctl add-port ovsbr0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuser
+ovs-vsctl set Interface vhost-user1 options:n_rxq=2
+ovs-vsctl set Interface vhost-user2 options:n_rxq=2
+```
+_Run ovs_test.sh_
+```bash
+./ovs_test.sh
+```
+
+_Launch the VMs_
+
+VMs run in client mode. They connect to the socket created by the `dpdkvhostuser` backend.
+```bash
+# 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.
+./cloud-hypervisor \
+        --cpus boot=2 \
+        --memory size=512M,file=/dev/hugepages   \
+        --kernel vmlinux \
+        --cmdline "reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3" \
+        --disk path=clear-kvm.img   \
+        --net "mac=52:54:00:02:d9:01,vhost_user=true,socket=/var/run/openvswitch/vhost-user1,num_queues=4"
+
+# 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.
+./cloud-hypervisor \
+        --cpus boot=2 \
+        --memory size=512M,file=/dev/hugepages   \
+        --kernel vmlinux \
+        --cmdline "reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3" \
+        --disk path=clear-kvm.img   \
+        --net "mac=52:54:20:11:C5:02,vhost_user=true,socket=/var/run/openvswitch/vhost-user2,num_queues=4"
+```
+
+_Setup VM1_
+```bash
+# From inside the guest
+sudo ip addr add 172.100.0.1/24 dev enp0s3
+```
+
+_Setup VM2_
+```bash
+# From inside the guest
+sudo ip addr add 172.100.0.2/24 dev enp0s3
+```
+
+_Ping VM1 from VM2_
+```bash
+# From inside the guest
+sudo ping 172.100.0.1
+```
+
+_Ping VM2 from VM1_
+```bash
+# From inside the guest
+sudo ping 172.100.0.2
+```
+
+__Result:__ At this point, VM1 and VM2 can ping each other successfully. We can now run `iperf3` test.
+
+_Run VM1 as server_
+```bash
+# From inside the guest
+iperf3 -s -p 4444
+```
+
+_Run VM2 as client_
+```bash
+# From inside the guest
+iperf3 -c 172.100.0.1 -t 30 -p 4444 &
+```
+