Some problems about VPP config for Vhost-user CNI plugin

[TrevorTaoARM]

@rkamudhan @john
I am using your vhost-user-net-plugin for vpp-17.10, but met some problems when I use it to config the Vhost-user for K8s Pod, which leads the 2 container can not ping each other successfully:

1. For the vpp-config.py, the function
   def configVhostPortRoute(port, containerIP, containerMAC):
   1.1 For the command:
   cmd = 'vppctl set int unnum {} use loop0'.format(port), I don't find a command to create the loop0 interface, is the loop0 should be created beforehand and what are the related configurations about it?
   1.2 For the command:
   cmd = 'vppctl show tap', it shows:
   unknown input `vppctl show tap', so what are the commands about the "tap", so that the subsequent "ip link set " command can be executed?

2. For the created vpp container by this vhost-user-net-plugin, I see in the README.md:
   "Run the VPP in a container A as follows"
   " # vpp unix {log /tmp/vpp.log cli-listen 0.0.0.0:5002} api-trace { on }
   dpdk {coremask 0x2 no-multi-seg no-pci singlefile 512 extra --vdev=virtio_user0,path=/vhost-user-net-plugin/4d578250ad8d760c0722be78badb4b4b6d57fed8f95dea23aaa0065aa8657b29/4d578250ad8d-net1,mac=e2:52:b5:7b:58:ad } cpu {skip-cores 1}"
   " # vppctl set int state virtio_user0 up"
   " # vppctl set int ip table virtio_user0 0"
   Run the VPP in another container B and ping the Container A
   " # vppctl ping 10.56.217.132"

And I do see a VirtioUser0/0/0 interface in the container's vpp, but I don't see how the IP address(10.56.217.131,10.56.217.132) are configured in the vpp, could you give a more detailed information about the configuration in the vpp container?

I tried to set the IP address on this VirtioUser0/0/0 interface, but it does not work. Could you give some introduction about your configuration here.

[rkamudhan]

@TrevorTaoARM I will look into this issue

[TrevorTaoARM]

@rkamudhan
Thank you very much for your help.
One more question here:
I see in the vpp-config.py, there is a command:

cmd = 'vppctl set int unnum {} use loop0'.format(port)

But I don't see any configuration about the 'loop0', did you enable it beforehand, how about the configurations if possible?