diff --git a/test_plans/vm2vm_virtio_net_perf_cbdma_test_plan.rst b/test_plans/vm2vm_virtio_net_perf_cbdma_test_plan.rst
index 60036743..284c22f6 100644
--- a/test_plans/vm2vm_virtio_net_perf_cbdma_test_plan.rst
+++ b/test_plans/vm2vm_virtio_net_perf_cbdma_test_plan.rst
@@ -8,17 +8,32 @@ VM2VM vhost-user/virtio-net with CBDMA test plan
 Description
 ===========
 
-Vhost asynchronous data path leverages DMA devices to offload memory copies from the CPU and it is implemented in an asynchronous way.
-In addition, vhost supports M:N mapping between vrings and DMA virtual channels. Specifically, one vring can use multiple different DMA
-channels and one DMA channel can be shared by multiple vrings at the same time.From DPDK22.07, Vhost enqueue and dequeue operation with
-CBDMA channels is supported in both split and packed ring.
+CBDMA is a kind of DMA engine, Vhost asynchronous data path leverages DMA devices
+to offload memory copies from the CPU and it is implemented in an asynchronous way.
+As a result, large packet copy can be accelerated by the DMA engine, and vhost can
+free CPU cycles for higher level functions.
+
+Asynchronous data path is enabled per tx/rx queue, and users need
+to specify the DMA device used by the tx/rx queue. Each tx/rx queue
+only supports to use one DMA device, but one DMA device can be shared
+among multiple tx/rx queues of different vhostpmd ports.
+
+Two PMD parameters are added:
+- dmas:	specify the used DMA device for a tx/rx queue
+(Default: no queues enable asynchronous data path)
+- dma-ring-size: DMA ring size.
+(Default: 4096).
+
+Here is an example:
+--vdev 'eth_vhost0,iface=./s0,dmas=[txq0@0000:00.01.0;rxq0@0000:00.01.1],dma-ring-size=4096'
+
 This document provides the test plan for testing the following features when Vhost-user using asynchronous data path with
 CBDMA in VM2VM virtio-net topology.
-1. Check Vhost tx offload（TSO） function by verifing the TSO/cksum in the TCP/IP stack with vm2vm split ring and packed ring
+1.Check Vhost tx offload（TSO） function by verifing the TSO/cksum in the TCP/IP stack with vm2vm split ring and packed ring
 vhost-user/virtio-net mergeable path.
 2.Check the payload of large packet (larger than 1MB) is valid after forwarding packets with vm2vm split ring
 and packed ring vhost-user/virtio-net mergeable and non-mergeable path.
-3. Multi-queues number dynamic change in vm2vm vhost-user/virtio-net with split ring and packed ring.
+3.Multi-queues number dynamic change in vm2vm vhost-user/virtio-net with split ring and packed ring.
 
 Note:
 1.For packed virtqueue virtio-net test, need qemu version > 4.2.0 and VM kernel version > 5.1, and packed ring multi-queues not support reconnect in qemu yet.
@@ -41,7 +56,7 @@ Topology
 Software
 --------
     iperf
-    qemu: https://download.qemu.org/qemu-7.0.0.tar.xz
+    qemu: https://download.qemu.org/qemu-7.1.0.tar.xz
 
 General set up
 --------------
@@ -88,16 +103,16 @@ by verifing the TSO/cksum in the TCP/IP stack when vhost uses the asynchronous o
 2. Launch vhost by below command::
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 2-4 -n 4 --file-prefix=vhost \
-	-a 0000:00:04.0 -a 0000:00:04.1 \
-	--vdev 'net_vhost0,iface=vhost-net0,queues=1,tso=1,dmas=[txq0;rxq0]' \
-	--vdev 'net_vhost1,iface=vhost-net1,queues=1,tso=1,dmas=[txq0;rxq0]' \
-	--iova=va -- -i --nb-cores=2 --txd=1024 --rxd=1024 --txq=1 --rxq=1 --lcore-dma=[lcore3@0000:00:04.0,lcore4@0000:00:04.1]
+	-a 0000:00:01.0 -a 0000:00:01.1 \
+	--vdev 'net_vhost0,iface=vhost-net0,queues=1,tso=1,dmas=[txq0@0000:00:01.0;rxq0@0000:00:01.0]' \
+	--vdev 'net_vhost1,iface=vhost-net1,queues=1,tso=1,dmas=[txq0@0000:00:01.1;rxq0@0000:00:01.1]' \
+	--iova=va -- -i --nb-cores=2 --txd=1024 --rxd=1024 --txq=1 --rxq=1
 	testpmd>start
 
 3. Launch VM1 and VM2::
 
 	taskset -c 32 qemu-system-x86_64 -name vm1 -enable-kvm -cpu host -smp 1 -m 4096 \
-	-object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge1G0,share=on \
+	-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/vm1_qga0.sock,server,nowait,id=vm1_qga0 -device virtio-serial \
 	-device virtserialport,chardev=vm1_qga0,name=org.qemu.guest_agent.2 -daemonize \
@@ -109,7 +124,7 @@ by verifing the TSO/cksum in the TCP/IP stack when vhost uses the asynchronous o
 	csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on -vnc :10
 
 	taskset -c 33 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 1 -m 4096 \
-	-object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge1G1,share=on \
+	-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 \
@@ -150,13 +165,11 @@ The dynamic change of multi-queues number and iova as VA and PA mode also test.
 2. Launch vhost by below command::
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
-	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
-	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore2@0000:00:04.4,lcore2@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
-	testpmd>start
+	-a 0000:00:01.0 -a 0000:00:01.1 -a 0000:00:01.2 -a 0000:00:01.3 -a 0000:00:01.4 -a 0000:00:01.5 -a 0000:00:01.6 -a 0000:00:01.7 \
+	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0@0000:00:01.0;txq1@0000:00:01.0;txq2@0000:00:01.1;txq3@0000:00:01.1;txq4@0000:00:01.2;txq5@0000:00:01.2;txq6@0000:00:01.3;txq7@0000:00:01.3;rxq0@0000:00:01.4;rxq1@0000:00:01.4;rxq2@0000:00:01.5;rxq3@0000:00:01.5;rxq4@0000:00:01.6;rxq5@0000:00:01.6;rxq6@0000:00:01.7;rxq7@0000:00:01.7]' \
+	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[txq0@0000:00:01.0;txq1@0000:00:01.0;txq2@0000:00:01.1;txq3@0000:00:01.1;txq4@0000:00:01.2;txq5@0000:00:01.2;txq6@0000:00:01.3;txq7@0000:00:01.3;rxq0@0000:00:01.4;rxq1@0000:00:01.4;rxq2@0000:00:01.5;rxq3@0000:00:01.5;rxq4@0000:00:01.6;rxq5@0000:00:01.6;rxq6@0000:00:01.7;rxq7@0000:00:01.7]' \
+	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+    testpmd>start
 
 3. Launch VM1 and VM2 using qemu::
 
@@ -205,15 +218,13 @@ The dynamic change of multi-queues number and iova as VA and PA mode also test.
 	Under VM1, run: `iperf -s -i 1`
 	Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
-8. Quit and relaunch vhost w/ diff CBDMA channels::
+8. Quit and relaunch vhost w/ diff CBDMA channels and legacy mode::
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
-	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
-	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6]' \
-	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[txq1;txq2;txq3;txq4;txq5;txq6;txq7]' \
-	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.0,lcore3@0000:00:04.2,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:00:04.1,lcore4@0000:00:04.3,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
+	-a 0000:00:01.0 -a 0000:00:01.1 \
+	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,legacy-ol-flags=1,queues=8,dmas=[txq0@0000:00:01.0;txq1@0000:00:01.0;txq2@0000:00:01.0;txq3@0000:00:01.0;txq4@0000:00:01.0;txq5@0000:00:01.0;txq6@0000:00:01.0]' \
+	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,legacy-ol-flags=1,queues=8,dmas=[txq1@0000:00:01.1;txq2@0000:00:01.1;txq3@0000:00:01.1;txq4@0000:00:01.1;txq5@0000:00:01.1;txq6@0000:00:01.1;txq7@0000:00:01.1]' \
+	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
 	testpmd>start
 
 9. Rerun step 6-7.
@@ -221,12 +232,10 @@ The dynamic change of multi-queues number and iova as VA and PA mode also test.
 10. Quit and relaunch vhost w/ iova=pa::
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
-	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
-	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6]' \
-	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6]' \
-	--iova=pa -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.0,lcore3@0000:00:04.2,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:00:04.1,lcore4@0000:00:04.3,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
+	-a 0000:00:01.0 -a 0000:00:01.1 -a 0000:00:01.2 -a 0000:00:01.3 -a 0000:00:01.4 -a 0000:00:01.5 -a 0000:00:01.6 -a 0000:00:01.7 \
+	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0@0000:00:01.0;txq1@0000:00:01.1;txq2@0000:00:01.0;txq3@0000:00:01.1;txq4@0000:00:01.0;txq5@0000:00:01.1;txq6@0000:00:01.2]' \
+	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[rxq0@0000:00:01.2;rxq1@0000:00:01.3;rxq2@0000:00:01.2;rxq3@0000:00:01.3;rxq4@0000:00:01.2;rxq5@0000:00:01.3;rxq6@0000:00:01.4]' \
+	--iova=pa -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
 	testpmd>start
 
 11. Rerun step 6-7.
@@ -259,8 +268,8 @@ The dynamic change of multi-queues number and iova as VA and PA mode also test.
 17. Quit and relaunch vhost with 1 queues::
 
      <dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
-     --vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=4' \
-	 --vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=4' \
+     --vdev 'net_vhost0,iface=vhost-net0,client=1,queues=4' \
+     --vdev 'net_vhost1,iface=vhost-net1,client=1,queues=4' \
      -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=1 --rxq=1
      testpmd>start
 
@@ -294,10 +303,9 @@ The dynamic change of multi-queues number and the reconnection also test.
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
 	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore2@0000:00:04.4,lcore2@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
+	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.1;txq2@0000:00:04.2;txq3@0000:00:04.3;txq4@0000:00:04.4;txq5@0000:00:04.5;txq6@0000:00:04.6;txq7@0000:00:04.7;rxq0@0000:00:04.0;rxq1@0000:00:04.1;rxq2@0000:00:04.2;rxq3@0000:00:04.3;rxq4@0000:00:04.4;rxq5@0000:00:04.5;rxq6@0000:00:04.6;rxq7@0000:00:04.7],dma-ring-size=32' \
+	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[txq0@0000:80:04.0;txq1@0000:80:04.1;txq2@0000:80:04.2;txq3@0000:80:04.3;txq4@0000:80:04.4;txq5@0000:80:04.5;txq6@0000:80:04.6;txq7@0000:80:04.7;rxq0@0000:80:04.0;rxq1@0000:80:04.1;rxq2@0000:80:04.2;rxq3@0000:80:04.3;rxq4@0000:80:04.4;rxq5@0000:80:04.5;rxq6@0000:80:04.6;rxq7@0000:80:04.7],dma-ring-size=32' \
+	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
 	testpmd>start
 
 3. Launch VM1 and VM2::
@@ -351,14 +359,12 @@ The dynamic change of multi-queues number and the reconnection also test.
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
-	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6]' \
-	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[txq1;txq2;txq3;txq4;txq5;txq6]' \
-	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.0,lcore3@0000:00:04.2,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:00:04.1,lcore4@0000:00:04.3,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
+	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=8,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.1;txq2@0000:00:04.2;txq3@0000:00:04.3;txq4@0000:00:04.4;txq5@0000:00:04.5],dma-ring-size=32' \
+	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=8,dmas=[rxq2@0000:00:04.2;rxq30000:00:04.3;rxq4@0000:00:04.4;rxq5@0000:00:04.5;rxq6@0000:00:04.6;rxq7@0000:00:04.7],dma-ring-size=32' \
+	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
 	testpmd>start
 
-9. Rerun step 6-7.
+9. Rerun step 6-7 three times.
 
 10. Quit and relaunch vhost ports w/o CBDMA channels::
 
@@ -400,10 +406,11 @@ The dynamic change of multi-queues number and the reconnection also test.
 	Under VM1, run: `iperf -s -i 1`
 	Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
-Test Case 4: VM2VM virtio-net split ring mergeable 16 queues CBDMA enable test with large packet payload valid check
---------------------------------------------------------------------------------------------------------------------
+Test Case 4: VM2VM virtio-net split ring mergeable 16 queues CBDMA enable test with Rx/Tx csum in SW
+----------------------------------------------------------------------------------------------------
 This case uses iperf and scp to test the payload of large packet (larger than 1MB) is valid after packets forwarding in
-vm2vm vhost-user/virtio-net split ring mergeable path and 16 queues when vhost uses the asynchronous operations with CBDMA channels.
+vm2vm vhost-user/virtio-net split ring mergeable path and 16 queues when vhost uses the asynchronous operations with CBDMA channels
+and perform SW checksum in Rx/Tx path.
 
 1. Bind 16 CBDMA channels to vfio-pci, as common step 1.
 
@@ -412,10 +419,16 @@ vm2vm vhost-user/virtio-net split ring mergeable path and 16 queues when vhost u
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-9 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
 	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=16,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;txq8;txq9;txq10;txq11;txq12;txq13;txq14;txq15;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7;rxq8;rxq9;rxq10;rxq11;rxq12;rxq13;rxq14;rxq15]' \
-	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=16,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;txq8;txq9;txq10;txq11;txq12;txq13;txq14;txq15;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7;rxq8;rxq9;rxq10;rxq11;rxq12;rxq13;rxq14;rxq15]' \
+	--vdev 'net_vhost0,iface=vhost-net0,client=1,tso=1,queues=16,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.0;txq2@0000:00:04.1;txq3@0000:00:04.1;txq4@0000:00:04.2;txq5@0000:00:04.2;txq6@0000:00:04.3;txq7@0000:00:04.3;txq8@0000:00:04.4;txq9@0000:00:04.4;txq10@0000:00:04.5;txq11@0000:00:04.5;txq12@0000:00:04.6;txq13@0000:00:04.6;txq14@0000:00:04.7;txq15@0000:00:04.7;rxq0@0000:80:04.0;rxq1@0000:80:04.0;rxq2@0000:80:04.1;rxq3@0000:80:04.1;rxq4@0000:80:04.2;rxq5@0000:80:04.2;rxq6@0000:80:04.3;rxq7@0000:80:04.3;rxq8@0000:80:04.4;rxq9@0000:80:04.4;rxq10@0000:80:04.5;rxq11@0000:80:04.5;rxq12@0000:80:04.6;rxq13@0000:80:04.6;rxq14@0000:80:04.7;rxq15@0000:80:04.7]' \
+	--vdev 'net_vhost1,iface=vhost-net1,client=1,tso=1,queues=16,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.1;txq2@0000:00:04.2;txq3@0000:00:04.3;txq4@0000:00:04.4;txq5@0000:00:04.5;txq6@0000:00:04.6;txq7@0000:00:04.7;txq8@0000:80:04.0;txq9@0000:80:04.1;txq10@0000:80:04.2;txq11@0000:80:04.3;txq12@0000:80:04.4;txq13@0000:80:04.5;txq14@0000:80:04.6;txq15@0000:80:04.7;rxq0@0000:00:04.0;rxq1@0000:00:04.1;rxq2@0000:00:04.2;rxq3@0000:00:04.3;rxq4@0000:00:04.4;rxq5@0000:00:04.5;rxq6@0000:00:04.6;rxq7@0000:00:04.7;rxq8@0000:80:04.0;rxq9@0000:80:04.1;rxq10@0000:80:04.2;rxq11@0000:80:04.3;rxq12@0000:80:04.4;rxq13@0000:80:04.5;rxq14@0000:80:04.6;rxq15@0000:80:04.7]' \
 	--iova=va -- -i --nb-cores=8 --txd=1024 --rxd=1024 --txq=16 --rxq=16 \
 	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore3@0000:00:04.2,lcore3@0000:00:04.3,lcore4@0000:00:04.4,lcore4@0000:00:04.5,lcore5@0000:00:04.6,lcore5@0000:00:04.7,lcore6@0000:80:04.0,lcore6@0000:80:04.1,lcore7@0000:80:04.2,lcore7@0000:80:04.3,lcore8@0000:80:04.4,lcore8@0000:80:04.5,lcore9@0000:80:04.6,lcore9@0000:80:04.7]
+	testpmd>set fwd csum
+	testpmd>stop
+	testpmd>port stop all
+	testpmd>port config 0 tx_offload tcp_cksum on
+	testpmd>port config 1 tx_offload tcp_cksum on
+	testpmd>port start all
 	testpmd>start
 
 3. Launch VM1 and VM2 using qemu::
@@ -430,7 +443,7 @@ vm2vm vhost-user/virtio-net split ring mergeable path and 16 queues when vhost u
 	-chardev socket,id=char0,path=./vhost-net0,server \
 	-netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=16 \
 	-device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,\
-	mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :10
+	mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=off,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :10
 
 	taskset -c 40 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 8 -m 4096 \
 	-object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge,share=on \
@@ -442,7 +455,7 @@ vm2vm vhost-user/virtio-net split ring mergeable path and 16 queues when vhost u
 	-chardev socket,id=char0,path=./vhost-net1,server \
 	-netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=16 \
 	-device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,\
-	mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :12
+	mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=off,guest_ecn=on,guest_ufo=on,host_ufo=on -vnc :12
 
 4. On VM1, set virtio device IP and run arp protocal::
 
@@ -476,9 +489,9 @@ by verifing the TSO/cksum in the TCP/IP stack when vhost uses the asynchronous o
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 2-4 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 \
-	--vdev 'net_vhost0,iface=vhost-net0,queues=1,tso=1,dmas=[txq0;rxq0]' \
-	--vdev 'net_vhost1,iface=vhost-net1,queues=1,tso=1,dmas=[txq0;rxq0]' \
-	--iova=va -- -i --nb-cores=2 --txd=1024 --rxd=1024 --txq=1 --rxq=1 --lcore-dma=[lcore3@0000:00:04.0,lcore4@0000:00:04.1]
+	--vdev 'net_vhost0,iface=vhost-net0,queues=1,tso=1,dmas=[txq0@0000:00:04.0;rxq0@0000:00:04.0]' \
+	--vdev 'net_vhost1,iface=vhost-net1,queues=1,tso=1,dmas=[txq0@0000:00:04.1;rxq0@0000:00:04.1]' \
+	--iova=va -- -i --nb-cores=2 --txd=1024 --rxd=1024 --txq=1 --rxq=1
 	testpmd>start
 
 3. Launch VM1 and VM2 on socket 1 with qemu::
@@ -538,10 +551,9 @@ vm2vm vhost-user/virtio-net packed ring mergeable path and 8 queues when vhost u
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
 	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,queues=8,tso=1,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--vdev 'net_vhost1,iface=vhost-net1,queues=8,tso=1,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore3@0000:00:04.0,lcore3@0000:00:04.2,lcore3@0000:00:04.4,lcore3@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:00:04.1,lcore4@0000:00:04.3,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
+	--vdev 'net_vhost0,iface=vhost-net0,queues=8,tso=1,dmas=dmas=[txq0@0000:00:04.0;txq1@0000:00:04.0;txq2@0000:00:04.1;txq3@0000:00:04.1;txq4@0000:00:04.2;txq5@0000:00:04.2;txq6@0000:00:04.3;txq7@0000:00:04.3;rxq0@0000:00:04.4;rxq1@0000:00:04.4;rxq2@0000:00:04.5;rxq3@0000:00:04.5;rxq4@0000:00:04.6;rxq5@0000:00:04.6;rxq6@0000:00:04.7;rxq7@0000:00:04.7]' \
+	--vdev 'net_vhost1,iface=vhost-net1,queues=8,tso=1,dmas=dmas=[txq0@0000:00:04.0;txq1@0000:00:04.0;txq2@0000:00:04.1;txq3@0000:00:04.1;txq4@0000:00:04.2;txq5@0000:00:04.2;txq6@0000:00:04.3;txq7@0000:00:04.3;rxq0@0000:00:04.4;rxq1@0000:00:04.4;rxq2@0000:00:04.5;rxq3@0000:00:04.5;rxq4@0000:00:04.6;rxq5@0000:00:04.6;rxq6@0000:00:04.7;rxq7@0000:00:04.7]' \
+	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
 	testpmd>start
 
 3. Launch VM1 and VM2 with qemu::
@@ -605,11 +617,10 @@ vm2vm vhost-user/virtio-net packed ring non-mergeable path and 8 queues when vho
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
 	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,queues=8,tso=1,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--vdev 'net_vhost1,iface=vhost-net1,queues=8,tso=1,dmas=[txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5]' \
-	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore2@0000:00:04.4,lcore2@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
-	testpmd>start
+	--vdev 'net_vhost0,iface=vhost-net0,queues=8,tso=1,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.0;txq2@0000:00:04.1;txq3@0000:00:04.1;txq4@0000:00:04.2;txq5@0000:00:04.2;rxq2@0000:00:04.3;rxq3@0000:00:04.3;rxq4@0000:00:04.4;rxq5@0000:00:04.4;rxq6@0000:00:04.5;rxq7@0000:00:04.5],dma-ring-size=32' \
+	--vdev 'net_vhost1,iface=vhost-net1,queues=8,tso=1,dmas=[txq2@0000:80:04.0;txq3@0000:80:04.0;txq4@0000:80:04.1;txq5@0000:80:04.1;txq6@0000:80:04.2;txq7@0000:80:04.2;rxq0@0000:80:04.3;rxq1@0000:80:04.3;rxq2@0000:80:04.4;rxq3@0000:80:04.4;rxq4@0000:80:04.5;rxq5@0000:80:04.5],dma-ring-size=32' \
+	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
+    testpmd>start
 
 3. Launch VM1 and VM2::
 
@@ -660,10 +671,11 @@ vm2vm vhost-user/virtio-net packed ring non-mergeable path and 8 queues when vho
 
 8. Rerun step 6-7 five times.
 
-Test Case 8: VM2VM virtio-net packed ring mergeable 16 queues CBDMA enabled test with large packet payload valid check
-----------------------------------------------------------------------------------------------------------------------
+Test Case 8: VM2VM virtio-net packed ring mergeable 16 queues CBDMA enabled test with Rx/Tx csum in SW
+------------------------------------------------------------------------------------------------------
 This case uses iperf and scp to test the payload of large packet (larger than 1MB) is valid after packets forwarding in
-vm2vm vhost-user/virtio-net packed ring mergeable path and 16 queues when vhost uses the asynchronous operations with CBDMA channels.
+vm2vm vhost-user/virtio-net packed ring mergeable path and 16 queues when vhost uses the asynchronous operations with CBDMA channels
+and perform SW checksum in Rx/Tx path.
 
 1. Bind 16 CBDMA channels to vfio-pci, as common step 1.
 
@@ -672,10 +684,15 @@ vm2vm vhost-user/virtio-net packed ring mergeable path and 16 queues when vhost
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-9 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
 	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,queues=16,tso=1,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;txq8;txq9;txq10;txq11,txq12,txq13;txq14;txq15;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7;rxq8;rxq9;rxq10;rxq11;rxq12;rxq13;rxq14;rxq15]' \
-	--vdev 'net_vhost1,iface=vhost-net1,queues=16,tso=1,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;txq6;txq7;txq8;txq9;txq10;txq11,txq12,txq13;txq14;txq15;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7;rxq8;rxq9;rxq10;rxq11;rxq12;rxq13;rxq14;rxq15]' \
-	--iova=pa -- -i --nb-cores=8 --txd=1024 --rxd=1024 --txq=16 --rxq=16 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore3@0000:00:04.2,lcore3@0000:00:04.3,lcore4@0000:00:04.4,lcore4@0000:00:04.5,lcore5@0000:00:04.6,lcore5@0000:00:04.7,lcore6@0000:80:04.0,lcore6@0000:80:04.1,lcore7@0000:80:04.2,lcore7@0000:80:04.3,lcore8@0000:80:04.4,lcore8@0000:80:04.5,lcore9@0000:80:04.6,lcore9@0000:80:04.7]
+	--vdev 'net_vhost0,iface=vhost-net0,queues=16,tso=1,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.0;txq2@0000:00:04.1;txq3@0000:00:04.1;txq4@0000:00:04.2;txq5@0000:00:04.2;txq6@0000:00:04.3;txq7@0000:00:04.3;txq8@0000:00:04.4;txq9@0000:00:04.4;txq10@0000:00:04.5;txq11@0000:00:04.5;txq12@0000:00:04.6;txq13@0000:00:04.6;txq14@0000:00:04.7;txq15@0000:00:04.7;rxq0@0000:80:04.0;rxq1@0000:80:04.0;rxq2@0000:80:04.1;rxq3@0000:80:04.1;rxq4@0000:80:04.2;rxq5@0000:80:04.2;rxq6@0000:80:04.3;rxq7@0000:80:04.3;rxq8@0000:80:04.4;rxq9@0000:80:04.4;rxq10@0000:80:04.5;rxq11@0000:80:04.5;rxq12@0000:80:04.6;rxq13@0000:80:04.6;rxq14@0000:80:04.7;rxq15@0000:80:04.7]' \
+	--vdev 'net_vhost1,iface=vhost-net1,queues=16,tso=1,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.1;txq2@0000:00:04.2;txq3@0000:00:04.3;txq4@0000:00:04.4;txq5@0000:00:04.5;txq6@0000:00:04.6;txq7@0000:00:04.7;txq8@0000:80:04.0;txq9@0000:80:04.1;txq10@0000:80:04.2;txq11@0000:80:04.3;txq12@0000:80:04.4;txq13@0000:80:04.5;txq14@0000:80:04.6;txq15@0000:80:04.7;rxq0@0000:00:04.0;rxq1@0000:00:04.1;rxq2@0000:00:04.2;rxq3@0000:00:04.3;rxq4@0000:00:04.4;rxq5@0000:00:04.5;rxq6@0000:00:04.6;rxq7@0000:00:04.7;rxq8@0000:80:04.0;rxq9@0000:80:04.1;rxq10@0000:80:04.2;rxq11@0000:80:04.3;rxq12@0000:80:04.4;rxq13@0000:80:04.5;rxq14@0000:80:04.6;rxq15@0000:80:04.7]' \
+	--iova=va -- -i --nb-cores=8 --txd=1024 --rxd=1024 --txq=16 --rxq=16
+	testpmd>set fwd csum
+	testpmd>stop
+	testpmd>port stop all
+	testpmd>port config 0 tx_offload tcp_cksum on
+	testpmd>port config 1 tx_offload tcp_cksum on
+	testpmd>port start all
 	testpmd>start
 
 3. Launch VM1 and VM2 with qemu::
@@ -690,7 +707,7 @@ vm2vm vhost-user/virtio-net packed ring mergeable path and 16 queues when vhost
 	-chardev socket,id=char0,path=./vhost-net0 \
 	-netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=16 \
 	-device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,\
-	mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :10
+	mq=on,vectors=40,csum=on,guest_csum=off,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :10
 
 	taskset -c 40 qemu-system-x86_64 -name vm2 -enable-kvm -cpu host -smp 8 -m 4096 \
 	-object memory-backend-file,id=mem,size=4096M,mem-path=/mnt/huge1G1,share=on \
@@ -702,7 +719,7 @@ vm2vm vhost-user/virtio-net packed ring mergeable path and 16 queues when vhost
 	-chardev socket,id=char0,path=./vhost-net1 \
 	-netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce,queues=16 \
 	-device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:02,disable-modern=false,mrg_rxbuf=on,\
-	mq=on,vectors=40,csum=on,guest_csum=on,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :12
+	mq=on,vectors=40,csum=on,guest_csum=off,host_tso4=on,guest_tso4=on,guest_ecn=on,guest_ufo=on,host_ufo=on,packed=on -vnc :12
 
 4. On VM1, set virtio device IP and run arp protocal::
 
@@ -727,11 +744,11 @@ vm2vm vhost-user/virtio-net packed ring mergeable path and 16 queues when vhost
 
 8. Rerun step 6-7 five times.
 
-Test Case 9: VM2VM virtio-net packed ring CBDMA enable test with tcp traffic when set iova=pa
----------------------------------------------------------------------------------------------
+Test Case 9: VM2VM virtio-net packed ring CBDMA enable test dma-ring-size with tcp traffic
+------------------------------------------------------------------------------------------
 This case test the function of Vhost tx offload in the topology of vhost-user/virtio-net packed ring mergeable path
 by verifing the TSO/cksum in the TCP/IP stack when vhost uses the asynchronous enqueue operations with CBDMA channels
-and iova as PA mode.
+and the dma ring size is small.
 
 1. Bind 2 CBDMA channels to vfio-pci, as common step 1.
 
@@ -739,9 +756,9 @@ and iova as PA mode.
 
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 2-4 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 \
-	--vdev 'net_vhost0,iface=vhost-net0,queues=1,tso=1,dmas=[txq0;rxq0]' \
-	--vdev 'net_vhost1,iface=vhost-net1,queues=1,tso=1,dmas=[txq0;rxq0]' \
-	--iova=pa -- -i --nb-cores=2 --txd=1024 --rxd=1024 --txq=1 --rxq=1 --lcore-dma=[lcore3@0000:00:04.0,lcore4@0000:00:04.1]
+	--vdev 'net_vhost0,iface=vhost-net0,queues=1,tso=1,dmas=[txq0@0000:00:04.0;rxq0@0000:00:04.0],dma-ring-size=32' \
+	--vdev 'net_vhost1,iface=vhost-net1,queues=1,tso=1,dmas=[txq0@0000:00:04.1;rxq0@0000:00:04.1],dma-ring-size=32' \
+	--iova=va -- -i --nb-cores=2 --txd=1024 --rxd=1024 --txq=1 --rxq=1
 	testpmd>start
 
 3. Launch VM1 and VM2 on socket 1 with qemu::
@@ -789,15 +806,12 @@ and iova as PA mode.
 	Under VM1, run: `iperf -s -i 1`
 	Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
-8. Check 2VMs can receive and send big packets to each other through vhost log. Port 0 should have tx packets above 1522, Port 1 should have rx packets above 1522::
+8. Rerun step 6-7 three times.
 
-	testpmd>show port xstats all
-
-Test Case 10: VM2VM virtio-net packed ring mergeable 8 queues CBDMA enable and PA mode test with large packet payload valid check
----------------------------------------------------------------------------------------------------------------------------------
+Test Case 10: VM2VM virtio-net packed ring 8 queues CBDMA enable test with legacy mode
+--------------------------------------------------------------------------------------
 This case uses iperf and scp to test the payload of large packet (larger than 1MB) is valid after packets forwarding in
-vm2vm vhost-user/virtio-net packed ring mergeable path and 8 queues when vhost uses the asynchronous operations with CBDMA channels
-and iova as PA mode.
+vm2vm vhost-user/virtio-net packed ring mergeable path and 8 queues  with legacy mode when vhost uses the asynchronous operations with CBDMA channels.
 
 1. Bind 16 CBDMA channels to vfio-pci, as common step 1.
 
@@ -806,10 +820,9 @@ and iova as PA mode.
 	<dpdk dir># ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 --file-prefix=vhost \
 	-a 0000:00:04.0 -a 0000:00:04.1 -a 0000:00:04.2 -a 0000:00:04.3 -a 0000:00:04.4 -a 0000:00:04.5 -a 0000:00:04.6 -a 0000:00:04.7 \
 	-a 0000:80:04.0 -a 0000:80:04.1 -a 0000:80:04.2 -a 0000:80:04.3 -a 0000:80:04.4 -a 0000:80:04.5 -a 0000:80:04.6 -a 0000:80:04.7 \
-	--vdev 'net_vhost0,iface=vhost-net0,queues=8,tso=1,dmas=[txq0;txq1;txq2;txq3;txq4;txq5;rxq2;rxq3;rxq4;rxq5;rxq6;rxq7]' \
-	--vdev 'net_vhost1,iface=vhost-net1,queues=8,tso=1,dmas=[txq2;txq3;txq4;txq5;txq6;txq7;rxq0;rxq1;rxq2;rxq3;rxq4;rxq5]' \
-	--iova=pa -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8 \
-	--lcore-dma=[lcore2@0000:00:04.0,lcore2@0000:00:04.1,lcore2@0000:00:04.2,lcore2@0000:00:04.3,lcore2@0000:00:04.4,lcore2@0000:00:04.5,lcore3@0000:00:04.6,lcore3@0000:00:04.7,lcore4@0000:80:04.0,lcore4@0000:80:04.1,lcore4@0000:80:04.2,lcore4@0000:80:04.3,lcore4@0000:80:04.4,lcore4@0000:80:04.5,lcore4@0000:80:04.6,lcore5@0000:80:04.7]
+	--vdev 'net_vhost0,iface=vhost-net0,queues=8,tso=1,legacy-ol-flags=1,dmas=[txq0@0000:00:04.0;txq1@0000:00:04.0;txq2@0000:00:04.1;txq3@0000:00:04.1;txq4@0000:00:04.2;txq5@0000:00:04.2;rxq2@0000:00:04.3;rxq3@0000:00:04.3;rxq4@0000:00:04.4;rxq5@0000:00:04.4;rxq6@0000:00:04.5;rxq7@0000:00:04.5]' \
+	--vdev 'net_vhost1,iface=vhost-net1,queues=8,tso=1,legacy-ol-flags=1,dmas=[txq2@0000:80:04.0;txq3@0000:80:04.0;txq4@0000:80:04.1;txq5@0000:80:04.1;txq6@0000:80:04.2;txq7@0000:80:04.2;rxq0@0000:80:04.3;rxq1@0000:80:04.3;rxq2@0000:80:04.4;rxq3@0000:80:04.4;rxq4@0000:80:04.5;rxq5@0000:80:04.5]' \
+	--iova=va -- -i --nb-cores=4 --txd=1024 --rxd=1024 --txq=8 --rxq=8
 	testpmd>start
 
 3. Launch VM1 and VM2 with qemu::
@@ -859,4 +872,4 @@ and iova as PA mode.
 	Under VM1, run: `iperf -s -i 1`
 	Under VM2, run: `iperf -c 1.1.1.2 -i 1 -t 60`
 
-8. Rerun step 6-7 five times.
+8. Rerun step 6-7 three times.
