[dts] [PATCH V1] Add test plan about vhost qemu mtu

[lihong]

Signed-off-by: lihong <lihongx.ma at intel.com>
---
 test_plans/vhost_qemu_mtu_test_plan.rst | 146 ++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 test_plans/vhost_qemu_mtu_test_plan.rst

diff --git a/test_plans/vhost_qemu_mtu_test_plan.rst b/test_plans/vhost_qemu_mtu_test_plan.rst
new file mode 100644
index 0000000..0f0dab8
--- /dev/null
+++ b/test_plans/vhost_qemu_mtu_test_plan.rst
@@ -0,0 +1,146 @@
+.. Copyright (c) <2018>, Intel Corporation
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
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+     notice, this list of conditions and the following disclaimer.
+
+   - Redistributions in binary form must reproduce the above copyright
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+     the documentation and/or other materials provided with the
+     distribution.
+
+   - Neither the name of Intel Corporation nor the names of its
+     contributors may be used to endorse or promote products derived
+     from this software without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+   COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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+   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+   OF THE POSSIBILITY OF SUCH DAMAGE.
+
+===================
+Vhost MTU Test Plan
+===================
+
+The feature test the setting of MTU value of virtio-net and kernel driver.
+
+Prerequisites:
+==============
+
+The guests kernel should grand than 4.10
+The qemu version should greater or equal to 2.9
+
+The MTU length is the length of Ether content, so the packet length is
+MTU + length of Ether(not include CRC).
+Test the MTU function, we send the packet size with:
+packet length < MTU + len(Ether)
+packek length = MTU + len(Ether)
+packet length > MTU + len(Ether)
+When the packet length less or equal to the MTU value + length of Ether,
+the testpmd can received the packet.
+And when the packet length greater than the MTU value + length of Ether,
+the testpmd can not recevied the packet.
+
+Test Case: Test the MTU in virtio-net
+=====================================
+1. Launch the testpmd by below commands on host, and config mtu::
+
+    ./testpmd -c 0xc -n 4 --socket-mem 2048,2048 \
+    --vdev 'net_vhost0,iface=vhost-net,queues=1' \
+    -- -i --txd=512 --rxd=128 --nb-cores=1 --port-topology=chained
+    testpmd> port config mtu 0 2000
+    testpmd> set fwd mac
+    testpmd> start
+
+2. Launch VM::
+
+    Use the qemu_2.9 or qemu 2.10 to start the VM and the VM kernel should
+    grand than 4.10, set the mtu value to 2000
+
+    qemu-system-x86_64 \
+    -chardev socket,id=char0,path=./vhost-net \
+    -netdev type=vhost-user,id=netdev0,chardev=char0,vhostforce \
+    -device virtio-net-pci,netdev=netdev0,mrg_rxbuf=on,host_mtu=2000
+
+3. Check the MTU value in VM::
+
+    Use the ifconfig command to check the MTU value of
+    virtio kernel driver is 2000 in VM.
+
+4. Use scapy to listen on virtio driver::
+    >>> sniff(iface="ens4", count=1)
+
+5. Send a packet with size 1014, smaller than MTU + len(Ether)::
+    
+    The vm can receive the packet.
+
+6. Send a packet with size 2014, equal to MTU + len(Ether)::
+    
+    The vm can receive the packet.
+
+7. Send a packet with size 2015, greater than MTU + len(Ether)::
+
+    The vm can not receive the packet.
+
+8. Exit the scapy.
+
+Test Case: Test the MTU in pmd
+==============================
+1. Continue use the VM in Test Case1, bind the kernel driver to igb_uio::
+
+2. Launch testpmd in VM::
+
+    ./testpmd -c 0x03 -n 3 \
+    -- -i --txd=512 --rxd=128 --tx-offloads=0x0 --enable-hw-vlan-strip
+    testpmd> set fwd mac
+    testpmd> start
+
+3. Run `show port info 0` in VM, and check the MTU value is equal to 2000.
+
+4. Send a packet with size 1014, smaller than MTU + len(Ether)::
+    testpmd> clear port stats all
+    testpmd> show port stats 0
+
+    ######################## NIC statistics for port 0  #######################
+      RX-packets: 1          RX-missed: 0          RX-bytes:  1014
+      RX-errors: 0
+      RX-nombuf:  0
+      TX-packets: 1          TX-errors: 0          TX-bytes:  1014
+
+      Throughput (since last show)
+      Rx-pps:            0
+      Tx-pps:            0
+    ###########################################################################
+
+5. Send a packet with size 2014, equal to MTU + len(Ether)::
+    testpmd> clear port stats all
+    testpmd> show port stats 0
+
+    ######################## NIC statistics for port 0  #######################
+      RX-packets: 1          RX-missed: 0          RX-bytes:  2014
+      RX-errors: 0
+      RX-nombuf:  0
+      RX-packets: 1          TX-errors: 0          TX-bytes:  2014
+
+      Throughput (since last show)
+      Rx-pps:            0
+      Tx-pps:            0
+    ###########################################################################
+
+6. Send a packet with size 2015, greater than MTU + len(Ether)::
+    testpmd> clear port stats all
+    testpmd> show port stats 0
+
+    The testpmd can not received the packet.
-- 
2.7.4