[ovs-discuss] How to bind VM's NIC to OVS

[Vivek Gupta]

Thanks Christian

https://help.ubuntu.com/16.04/serverguide/DPDK.html#dpdk-openvswitch-guest is out of order.  Can you please suggest any other link.


From: Christian Ehrhardt [mailto:christian.ehrhardt at canonical.com]
Sent: Wednesday, April 27, 2016 7:38 PM
To: Vivek Gupta <vivek-g at hcl.com>
Cc: discuss at openvswitch.org
Subject: Re: [ovs-discuss] How to bind VM's NIC to OVS

Hi Vivek,
you are right the dpdk4/5 would be adding more Host interfaces to the bridge.
IMHO your steps 3&4 make wrong assumptions how this should work.

You want to create virtual interfaces on the Host that can be consumed by your guest.
These days you use vhost_user sockets for that.

Create one in the Host with e.g. with:
ovs-vsctl add-port ovsdpdkbr0 vhost-user-1 -- set Interface vhost-user-1 type=dpdkvhostuser

You then need to configure your guest in a way to configure its vnic to attach to that socket.
That can be done with qemu commandline or some assist by recent libvirt.

You might take a look at the examples here:
https://help.ubuntu.com/16.04/serverguide/DPDK.html#dpdk-openvswitch-guest
or more complete, but then also more complex
https://github.com/openvswitch/ovs/blob/master/INSTALL.DPDK.md#dpdk-vhost-user-vm-configuration



Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd

On Wed, Apr 27, 2016 at 3:53 PM, Vivek Gupta <vivek-g at hcl.com<mailto:vivek-g at hcl.com>> wrote:
Hi All

I am testing a scenario where I will receive the traffic on DPDK binded port on host machine and will forward that traffic to DPDK binded port of VM machine. For this I have done the followings-

  1.  Binded eth0 and eth1 of host machine to DPDK
  2.  Created the OVS bridge in host machine as below
$OVS_DIR/utilities/ovs-vsctl  add-br ovsbr0 -- set Bridge ovsbr0 datapath_type=netdev
$OVS_DIR/utilities/ovs-vsctl  add-port ovsbr0 dpdk0 -- set Interface dpdk0   type=dpdk
$OVS_DIR/utilities/ovs-vsctl  add-port ovsbr0 dpdk1 -- set Interface dpdk1   type=dpdk

3. Installed the VM and created virtual NIC(eth4, eth5)
4. Binded VM machine NIC to VM's DPDK

Now I am not able to understand how to attach VM's NIC to OVS?

To solve this I tried below command on HOST MACHINE
$OVS_DIR/utilities/ovs-vsctl  add-port ovsbr0 dpdk4 -- set Interface dpdk4   type=dpdk
$OVS_DIR/utilities/ovs-vsctl  add-port ovsbr0 dpdk5 -- set Interface dpdk5   type=dpdk

but got error "Cannot get interface dpdk4". I believe this is due to OVS is looking in host machine for interface "dpdk4 & dpdk5" although these interface are available in VM machine.

Do I need QEMU, if yes then how it will help.

Please suggest.

Thanks & Regards
Vivek Gupta
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