[Yardstick-233]latency measurment by using pktgen-dpdk

VM A runs pktgen-dpdk as a traffic generator and is connected
back-to-back with VM B running testpmd for forwarding packets.

1. use linux expect to fetch the latency statics data.
2. fetch 10 samples of latency and calculate avg_latency.
3. use screen to keep test scripts running in the background.
4. add a function send_command() for screen in ssh.py

JIRA:YARDSTICK-233

Change-Id: I90ae64b3d198c79f159275ae35715eb284f05080
Signed-off-by: wu.zhihui <wu.zhihui1@zte.com.cn>

1 files changed, 173 insertions, 0 deletions

diff --git a/tests/unit/benchmark/scenarios/networking/test_pktgen_dpdk.py b/tests/unit/benchmark/scenarios/networking/test_pktgen_dpdk.py
new file mode 100644
index 000000000..afc87abfb
--- /dev/null
+++ b/tests/unit/benchmark/scenarios/networking/test_pktgen_dpdk.py
@@ -0,0 +1,173 @@
+#!/usr/bin/env python
+
+##############################################################################
+# Copyright (c) 2015 ZTE and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+
+# Unittest for yardstick.benchmark.scenarios.networking.pktgen.Pktgen
+
+import mock
+import unittest
+import json
+
+from yardstick.benchmark.scenarios.networking import pktgen_dpdk
+
+@mock.patch('yardstick.benchmark.scenarios.networking.pktgen_dpdk.ssh')
+class PktgenDPDKLatencyTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.ctx = {
+            'host': {
+                'ip': '172.16.0.137',
+                'user': 'root',
+                'key_filename': 'mykey.key'
+            },
+            'target': {
+                'ip': '172.16.0.138',
+                'user': 'root',
+                'key_filename': 'mykey.key',
+                'ipaddr': '172.16.0.138'
+            }
+        }
+
+    def test_pktgen_dpdk_successful_setup(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+        }
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+        p.setup()
+
+        mock_ssh.SSH().execute.return_value = (0, '', '')
+        self.assertIsNotNone(p.server)
+        self.assertIsNotNone(p.client)
+        self.assertEqual(p.setup_done, True)
+
+    def test_pktgen_dpdk_successful_get_port_ip(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+        }
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+        p.server = mock_ssh.SSH()
+
+        mock_ssh.SSH().execute.return_value = (0, '', '')
+
+        p.get_port_ip(p.server, "eth1")
+
+        mock_ssh.SSH().execute.assert_called_with(
+            "ifconfig eth1 |grep 'inet addr' |awk '{print $2}' \
+            |cut -d ':' -f2 ")
+
+    def test_pktgen_dpdk_unsuccessful_get_port_ip(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+        }
+
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+        p.server = mock_ssh.SSH()
+
+        mock_ssh.SSH().execute.return_value = (1, '', 'FOOBAR')
+        self.assertRaises(RuntimeError, p.get_port_ip, p.server, "eth1")
+
+    def test_pktgen_dpdk_successful_get_port_mac(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+        }
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+        p.server = mock_ssh.SSH()
+
+        mock_ssh.SSH().execute.return_value = (0, '', '')
+
+        p.get_port_mac(p.server, "eth1")
+
+        mock_ssh.SSH().execute.assert_called_with(
+            "ifconfig |grep HWaddr |grep eth1 |awk '{print $5}' ")
+
+    def test_pktgen_dpdk_unsuccessful_get_port_mac(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+        }
+
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+        p.server = mock_ssh.SSH()
+
+        mock_ssh.SSH().execute.return_value = (1, '', 'FOOBAR')
+        self.assertRaises(RuntimeError, p.get_port_mac, p.server, "eth1")
+
+    def test_pktgen_dpdk_successful_no_sla(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+        }
+
+        result = {}
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+
+        sample_output = '100\n110\n112\n130\n149\n150\n90\n150\n200\n162\n'
+        mock_ssh.SSH().execute.return_value = (0, sample_output, '')
+
+        p.run(result)
+        self.assertEqual(result, {"avg_latency": 132})
+
+    def test_pktgen_dpdk_successful_sla(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+            'sla': {'max_latency': 100}
+        }
+        result = {}
+
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+
+        sample_output = '100\n100\n100\n100\n100\n100\n100\n100\n100\n100\n'
+        mock_ssh.SSH().execute.return_value = (0, sample_output, '')
+
+        p.run(result)
+
+        self.assertEqual(result, {"avg_latency": 100})
+
+    def test_pktgen_dpdk_unsuccessful_sla(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+            'sla': {'max_latency': 100}
+        }
+        result = {}
+
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+
+        p.server = mock_ssh.SSH()
+        p.client = mock_ssh.SSH()
+
+        sample_output = '100\n110\n112\n130\n149\n150\n90\n150\n200\n162\n'
+        mock_ssh.SSH().execute.return_value = (0, sample_output, '')
+        self.assertRaises(AssertionError, p.run, result)
+
+    def test_pktgen_dpdk_unsuccessful_script_error(self, mock_ssh):
+
+        args = {
+            'options': {'packetsize': 60},
+            'sla': {'max_latency': 100}
+        }
+        result = {}
+
+        p = pktgen_dpdk.PktgenDPDKLatency(args, self.ctx)
+
+        mock_ssh.SSH().execute.return_value = (1, '', 'FOOBAR')
+        self.assertRaises(RuntimeError, p.run, result)
+
+
+def main():
+    unittest.main()
+
+if __name__ == '__main__':
+    main()