[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, 162 insertions, 0 deletions

diff --git a/yardstick/benchmark/scenarios/networking/pktgen_dpdk.py b/yardstick/benchmark/scenarios/networking/pktgen_dpdk.py
new file mode 100644
index 000000000..86585eca3
--- /dev/null
+++ b/yardstick/benchmark/scenarios/networking/pktgen_dpdk.py
@@ -0,0 +1,162 @@
+##############################################################################
+# Copyright (c) 2016 ZTE corporation 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
+##############################################################################
+import pkg_resources
+import logging
+import time
+
+import yardstick.ssh as ssh
+from yardstick.benchmark.scenarios import base
+
+LOG = logging.getLogger(__name__)
+
+
+class PktgenDPDKLatency(base.Scenario):
+    """Execute pktgen-dpdk on one vm and execute testpmd on the other vm
+
+  Parameters
+    packetsize - packet size in bytes without the CRC
+        type:    int
+        unit:    bytes
+        default: 64
+    """
+    __scenario_type__ = "PktgenDPDKLatency"
+
+    PKTGEN_DPDK_SCRIPT = 'pktgen_dpdk_latency_benchmark.bash'
+    TESTPMD_SCRIPT = 'testpmd_fwd.bash'
+
+    def __init__(self, scenario_cfg, context_cfg):
+        self.scenario_cfg = scenario_cfg
+        self.context_cfg = context_cfg
+        self.setup_done = False
+
+    def setup(self):
+        '''scenario setup'''
+        self.pktgen_dpdk_script = pkg_resources.resource_filename(
+            'yardstick.benchmark.scenarios.networking',
+            PktgenDPDKLatency.PKTGEN_DPDK_SCRIPT)
+        self.testpmd_script = pkg_resources.resource_filename(
+            'yardstick.benchmark.scenarios.networking',
+            PktgenDPDKLatency.TESTPMD_SCRIPT)
+        host = self.context_cfg['host']
+        host_user = host.get('user', 'ubuntu')
+        host_ip = host.get('ip', None)
+        host_key_filename = host.get('key_filename', '~/.ssh/id_rsa')
+        target = self.context_cfg['target']
+        target_user = target.get('user', 'ubuntu')
+        target_ip = target.get('ip', None)
+        target_key_filename = target.get('key_filename', '~/.ssh/id_rsa')
+        LOG.info("user:%s, target:%s", target_user, target_ip)
+        self.server = ssh.SSH(target_user, target_ip,
+                              key_filename=target_key_filename)
+        self.server.wait(timeout=600)
+
+        # copy script to host
+        self.server.run("cat > ~/testpmd_fwd.sh",
+                        stdin=open(self.testpmd_script, "rb"))
+
+        LOG.info("user:%s, host:%s", host_user, host_ip)
+        self.client = ssh.SSH(host_user, host_ip,
+                              key_filename=host_key_filename)
+        self.client.wait(timeout=600)
+
+        # copy script to host
+        self.client.run("cat > ~/pktgen_dpdk.sh",
+                        stdin=open(self.pktgen_dpdk_script, "rb"))
+
+        self.setup_done = True
+        self.testpmd_args = ''
+        self.pktgen_args = []
+
+    @staticmethod
+    def get_port_mac(sshclient, port):
+        cmd = "ifconfig |grep HWaddr |grep %s |awk '{print $5}' " % port
+        LOG.debug("Executing command: %s", cmd)
+        status, stdout, stderr = sshclient.execute(cmd)
+
+        if status:
+            raise RuntimeError(stderr)
+        else:
+            return stdout.rstrip()
+
+    @staticmethod
+    def get_port_ip(sshclient, port):
+        cmd = "ifconfig %s |grep 'inet addr' |awk '{print $2}' \
+            |cut -d ':' -f2 " % port
+        LOG.debug("Executing command: %s", cmd)
+        status, stdout, stderr = sshclient.execute(cmd)
+
+        if status:
+            raise RuntimeError(stderr)
+        else:
+            return stdout.rstrip()
+
+    def run(self, result):
+        """execute the benchmark"""
+
+        if not self.setup_done:
+            self.setup()
+
+        if not self.testpmd_args:
+            self.testpmd_args = self.get_port_mac(self.client, 'eth2')
+
+        if not self.pktgen_args:
+            server_rev_mac = self.get_port_mac(self.server, 'eth1')
+            server_send_mac = self.get_port_mac(self.server, 'eth2')
+            client_src_ip = self.get_port_ip(self.client, 'eth1')
+            client_dst_ip = self.get_port_ip(self.client, 'eth2')
+
+            self.pktgen_args = [client_src_ip, client_dst_ip,
+                                server_rev_mac, server_send_mac]
+
+        options = self.scenario_cfg['options']
+        packetsize = options.get("packetsize", 64)
+        rate = options.get("rate", 100)
+
+        cmd = "screen sudo -E bash ~/testpmd_fwd.sh %s " % (self.testpmd_args)
+        LOG.debug("Executing command: %s", cmd)
+        self.server.send_command(cmd)
+
+        time.sleep(1)
+
+        cmd = "screen sudo -E bash ~/pktgen_dpdk.sh %s %s %s %s %s %s" % \
+            (self.pktgen_args[0], self.pktgen_args[1], self.pktgen_args[2],
+             self.pktgen_args[3], rate, packetsize)
+        LOG.debug("Executing command: %s", cmd)
+        self.client.send_command(cmd)
+
+        # wait for finishing test
+        time.sleep(1)
+
+        cmd = "cat ~/result.log -vT \
+               |awk '{match($0,/\[8;40H +[0-9]+/)} \
+               {print substr($0,RSTART,RLENGTH)}' \
+               |grep -v ^$ |awk '{if ($2 != 0) print $2}'"
+        client_status, client_stdout, client_stderr = self.client.execute(cmd)
+
+        if client_status:
+            raise RuntimeError(client_stderr)
+
+        avg_latency = 0
+        if client_stdout:
+            latency_list = client_stdout.split('\n')[0:-2]
+            LOG.info("10 samples of latency: %s", latency_list)
+            latency_sum = 0
+            for i in latency_list:
+                latency_sum += int(i)
+            avg_latency = latency_sum/len(latency_list)
+
+        result.update({"avg_latency": avg_latency})
+
+        if avg_latency and "sla" in self.scenario_cfg:
+            sla_max_latency = int(self.scenario_cfg["sla"]["max_latency"])
+            LOG.info("avg_latency : %d ", avg_latency)
+            LOG.info("sla_max_latency: %d", sla_max_latency)
+            debug_info = "avg_latency %d > sla_max_latency %d" \
+                % (avg_latency, sla_max_latency)
+            assert avg_latency <= sla_max_latency, debug_info