diff --git a/test_plans/vswitch_sample_cbdma_test_plan.rst b/test_plans/vswitch_sample_cbdma_test_plan.rst
new file mode 100644
index 00000000..c57c0015
--- /dev/null
+++ b/test_plans/vswitch_sample_cbdma_test_plan.rst
@@ -0,0 +1,242 @@
+=========================================
+Vswitch Vhost-user async driver test plan
+=========================================
+
+Description
+===========
+
+Vswitch sample can leverage IOAT to accelerate vhost async data-path from dpdk 20.11. This plan test
+vhost DMA operation callbacks for CBDMAV PMD and vhost async data-path in vhost sample. Also compare
+the performance between CPU copy, CBDMA copy and Sync copy. 
+CPU copy means vhost enqueue w/o cbdma channel; CBDMA copy needs vhost enqueue with cbdma channel
+using parameter '-dmas'; Sync copy needs vhost enqueue with cbdma channel, but threshold ( can be
+adjusted by change value of f.async_threshold in dpdk code) is larger than forwarding packet length.
+
+CBDMA performance indicator
+===========================
+
+(1)CPU copy vs. sync copy delta < 10% for 64B packet size
+(2)CBDMA copy vs sync copy delta > 5% for 1518 packet size
+
+Prerequisites
+=============
+
+Modify the testpmd code as following::
+
+	--- a/examples/vhost/main.c
+	+++ b/examples/vhost/main.c
+	@@ -29,7 +29,7 @@
+	 #include "main.h"
+
+	 #ifndef MAX_QUEUES
+	-#define MAX_QUEUES 128
+	+#define MAX_QUEUES 512
+	 #endif
+
+	 /* the maximum number of external ports supported */
+
+Test Case1: PVP performance check with CBDMA channel using vhost async driver
+=============================================================================
+
+1. Adjust dpdk code as below::
+
+	--- a/examples/vhost/main.c
+	+++ b/examples/vhost/main.c
+	@@ -1343,7 +1343,7 @@ new_device(int vid)
+
+        if (async_vhost_driver) {
+                	f.async_inorder = 1;
+	-               f.async_threshold = 256;
+	+               f.async_threshold = 0;
+                	return rte_vhost_async_channel_register(vid, VIRTIO_RXQ,
+                        	f.intval, &channel_ops);
+        }
+
+2. Bind physical port to vfio-pci and CBDMA channel to igb_uio.
+
+3. On host, launch dpdk-vhost by below command::
+
+	./dpdk-vhost -c 0x1c000000 -n 4 – \
+	-p 0x1 --mergeable 1 --vm2vm 1 --async_vhost_driver --stats 1 --socket-file /tmp/vhost-net -dmas [txd0@00:04.0]
+
+4. Launch virtio-user with testpmd::
+
+	./dpdk-testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+
+5. Start pkts from virtio-user side to let vswitch know the mac addr::
+
+	testpmd>set fwd mac #if use io fwd ,ixia can't receive packets
+	testpmd>start tx_first
+	testpmd>stop
+	testpmd>start #start to forward
+
+6. Inject different length pkts (packets length=64,512,1024,1518) seperately with VLAN_id=1000 and dest_mac=virtio_mac_addresss ( specific in above cmd with 00:11:22:33:44:10) to NIC using packet generator, record performance number.
+
+7. Adjust vswitch code as below, re-test step 3-6 and record perfromance of different packet length::
+
+	--- a/examples/vhost/main.c
+	+++ b/examples/vhost/main.c
+	@@ -1343,7 +1343,7 @@ new_device(int vid)
+
+        if (async_vhost_driver) {
+                	f.async_inorder = 1;
+	-               f.async_threshold = 256;
+	+               f.async_threshold = 0;
+                	return rte_vhost_async_channel_register(vid, VIRTIO_RXQ,
+                        	f.intval, &channel_ops);
+        }
+
+8. Re-test step 3-6 except to launch dpdk-vhost by below command, record perfromance of different packet length::
+
+	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --stats 1 --socket-file /tmp/vhost-net
+
+9. Compare performance, check below two performance indicator::
+
+	(1)CPU copy vs. sync copy delta < 10% for 64B packet size
+	(2)CBDMA copy vs sync copy delta > 5% for 1518 packet size
+
+Test Case2: PV test with multiple CBDMA channels using vhost async driver
+==========================================================================
+
+1. Bind two physical ports to vfio-pci and two CBDMA channels to igb_uio.
+
+2. On host, launch dpdk-vhost by below command::
+
+	./dpdk-vhost -c 0x1c000000 -n 4 – \
+	-p 0x1 --mergeable 1 --vm2vm 1 --async_vhost_driver --stats 1 --socket-file /tmp/vhost-net0 -socket-file /tmp/vhost-net1 --dmas [txd0@00:04.0,txd1@00:04.1]
+
+3. launch two virtio-user ports::
+
+	./dpdk-testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net0,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+	
+	./dpdk-testpmd -l 31-32 -n 4 --no-pci --file-prefix=testpmd1 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:11,path=/tmp/vhost-net1,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+
+4. Start pkts from two virtio-user side individually to let vswitch know the mac addr::
+
+	testpmd0>set fwd mac
+	testpmd0>start tx_first
+	testpmd0>stop
+	testpmd0>start
+
+	testpmd1>set fwd mac
+	testpmd1>start tx_first
+	testpmd1>stop
+	testpmd1>start
+
+5. Inject traffic with VLAN_id=1000 and dest_mac=virtio_mac_addresss (00:11:22:33:44:10 and 00:11:22:33:44:11) to NIC using packet generator, check two virtio-user ports can receive according packets.
+
+Test Case3: VM2VM performance test with two CBDMA channels using vhost async driver
+====================================================================================
+
+1.Bind two physical ports to vfio-pci and two CBDMA channels to igb_uio.
+
+2. On host, launch dpdk-vhost by below command::
+
+	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --async_vhost_driver \
+	--socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1 --dmas [txd0@00:04.0,txd1@00:04.1]
+
+3. Launch virtio-user::
+
+	./dpdk-testpmd -l 29-30 -n 4 --no-pci --file-prefix=testpmd0 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/vhost-net0,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+
+	./dpdk-testpmd -l 31-32 -n 4 --no-pci --file-prefix=testpmd1 \
+	--vdev=net_virtio_user0,mac=00:11:22:33:44:11,path=/tmp/vhost-net0,queues=1 – -i --rxq=1 --txq=1 --txd=1024 --rxd=1024 --nb-cores=1 --no-numa
+
+4. Start pkts from two virtio-user sides, record performance number with txpkts=256 and 2000 from testpmd1 seperately::
+
+	testpmd0>set fwd mac
+	testpmd0>start tx_first
+	testpmd0>stop
+	testpmd0>set eth-peer 0 00:11:22:33:44:11
+	testpmd0>start
+
+	testpmd1>set fwd mac
+	testpmd1>set eth-peer 0 00:11:22:33:44:10
+	testpmd1>set txpkts 2000
+	testpmd1>start tx_first
+	testpmd1>show port stats all
+	testpmd1>stop
+	testpmd1>set txpkts 256
+	testpmd1>start tx_first
+	testpmd1>show port stats all
+
+5. Re-test step 2-4 except to launch dpdk-vhost by below command, record perfromance::
+
+	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1
+
+6. Compare perfromance number, when txpkts=2000, first test has better performance; while txpkts=256, the second test has better performance.
+
+Test Case4: VM2VM test with 2 vhost device using vhost async driver
+=======================================================================
+
+1. Bind two physical ports to vfio-pci and two CBDMA channels to igb_uio.
+
+2. On host, launch dpdk-vhost by below command::
+
+	./dpdk-vhost -c 0x1c000000 -n 4 – -p 0x1 --mergeable 1 --vm2vm 1 --async_vhost_driver \
+	--socket-file /tmp/vhost-net0 --socket-file /tmp/vhost-net1 --dmas [txd0@00:04.0,txd1@00:04.1]
+
+3. Start VM0::
+
+    qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 4 -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/ubuntu20-04.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 -device e1000,netdev=nttsip1 \
+    -netdev user,id=nttsip1,hostfwd=tcp:127.0.0.1:6002-:22 \
+    -chardev socket,id=char0,path=/tmp/vhost-net0 \
+    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=true,mrg_rxbuf=off,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on -vnc :10
+
+4. Start VM1::
+   
+    qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 4 -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/ubuntu20-04-2.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 -device e1000,netdev=nttsip1 \
+    -netdev user,id=nttsip1,hostfwd=tcp:10.67.119.61:6003-:22 \
+    -chardev socket,id=char0,path=/tmp/vhost-net1 \
+    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
+    -device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=true,mrg_rxbuf=off,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on -vnc :12
+
+5. Bind virtio port to vfio-pci in both two VMs::
+
+	modprobe vfio enable_unsafe_noiommu_mode=1
+	modprobe vfio-pci
+	echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
+	./usertools/dpdk-devbind.py --bind=vfio-pci 00:05.0
+
+6. Start testpmd in VMs seperately::
+
+	./dpdk-testpmd -l 1-2 -n 4 – -i --rxq=1 --txq=1 --nb-cores=1 --txd=1024 --rxd=1024
+
+7. Start pkts from two virtio-pmd, record performance number with txpkts=256 and 2000 from testpmd1 seperately::
+
+	testpmd0>set fwd mac
+	testpmd0>start tx_first
+	testpmd0>stop
+	testpmd0>set eth-peer 0 52:54:00:00:00:02
+	testpmd0>start
+
+	testpmd1>set fwd mac
+	testpmd1>set eth-peer 0 52:54:00:00:00:01
+	testpmd1>set txpkts 2000
+	testpmd1>start tx_first
+	testpmd1>show port stats all
+	testpmd1>stop
+	testpmd1>set txpkts 256
+	testpmd1>start tx_first
+	testpmd1>show port stats all
+
+8. Inject traffic with VLAN_id=1000 and dest_mac=virtio_mac_addresss (52:54:00:00:00:02 and 52:54:00:00:00:02) to NIC using packet generator, check two virtio-pmd can receive according packets.
+
+9. Quit two testpmd in two VMs, bind virtio-pmd port to virtio-pci,then bind port back to vfio-pci, rerun 50 times.
+
+
