[dts] [PATCH v1] test_plans/pvp_qemu_multi_paths_port_restart:add test plan for pvp qemu multi-paths and port restart test

[David Christensen]

> +Test flow
> +=========
> +
> +TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
> +
> +Test Case 1: pvp test with virtio 0.95 mergeable path
> +=====================================================
> +
> +1. Bind one port to igb_uio, then launch testpmd by below command::
> +
> +    rm -rf vhost-net*
> +    ./testpmd -c 0xe -n 4 --socket-mem 1024,1024 \
> +    --vdev 'eth_vhost0,iface=vhost-net,queues=1' -- \
> +    -i --nb-cores=1 --txd=1024 --rxd=1024
> +    testpmd>set fwd mac
> +    testpmd>start
> +
> +2. Launch VM with mrg_rxbuf feature on::
> +
> +    qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 2 -m 4096 \
> +    -object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
> +    -numa node,memdev=mem -mem-prealloc -drive file=/home/osimg/ubuntu16.img  \
> +    -chardev socket,path=/tmp/vm2_qga0.sock,server,nowait,id=vm2_qga0 -device virtio-serial \
> +    -device virtserialport,chardev=vm2_qga0,name=org.qemu.guest_agent.2 -daemonize \
> +    -monitor unix:/tmp/vm2_monitor.sock,server,nowait -net nic,vlan=2,macaddr=00:00:00:08:e8:aa,addr=1f \
> +    -net user,vlan=2,hostfwd=tcp:127.0.0.1:6002-:22 \
> +    -chardev socket,id=char0,path=./vhost-net \
> +    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
> +    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,mrg_rxbuf=on,rx_queue_size=1024,tx_queue_size=1024 \
> +    -vnc :10
> +
> +3. On VM, bind virtio net to igb_uio and run testpmd::
> +
> +    ./testpmd -c 0x3 -n 3 -- -i \
> +    --nb-cores=1 --txd=1024 --rxd=1024
> +    testpmd>set fwd mac
> +    testpmd>start

I'm a little confused about your test descriptions in the PVP cases. 
You seem to document the "Vhost --> Virtio--> Vhost" part of the flow 
only, I don't see how traffic enters of leaves the system without the 
physical NICs.  Could you add some more context on the whole system setup?

Dave