loadgen: Support for Stressor-VMs as a Loadgen

This patch adds support for stressor-VMs as a loadgen in VSPERF.
The changes include:
1. 07_loadgen.conf: User can specify the stressor-VM specific
configuration. It includes, image-name, path, nics, memory, etc.
2. loadgen/stressorvm/stressor_vm.py: This file implement ILoadGenerator
interface. It implements all the necessary APIs for starting and
stopping the loads.
3. Fixed Pylint Error
4. Removed the network device configuration from qemu-system-x86_64
command as stessor-vm mostly focus on CPU and memory stressing.
5. Moved the creation of loadgen after the VNFs are setup in
testcase.py.
6. Fixed copyright issues.
7. Removed python-3 checking. Improved exception handling
8. Set Default loadgen as DummyLoadGen
9. Improved OSError Printing with directory name and error
10. Update the year in license. 2017-2018.

JIRA: VSPERF-504

Change-Id: Iad6c0780c184f8e36eddcbcae2a580f41118e8dc
Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>

2 files changed, 133 insertions, 0 deletions

diff --git a/tools/load_gen/stressorvm/__init__.py b/tools/load_gen/stressorvm/__init__.py
new file mode 100644
index 00000000..6a22d81c
--- /dev/null
+++ b/tools/load_gen/stressorvm/__init__.py
@@ -0,0 +1,16 @@
+# Copyright 2017-2018 Spirent Communications
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Package with wrapper for Stressor-VMs
+"""
diff --git a/tools/load_gen/stressorvm/stressor_vm.py b/tools/load_gen/stressorvm/stressor_vm.py
new file mode 100644
index 00000000..410f10e3
--- /dev/null
+++ b/tools/load_gen/stressorvm/stressor_vm.py
@@ -0,0 +1,117 @@
+# Copyright 2017-2018 Spirent Communications.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Wrapper file to create and manage Stressor-VM as loadgen
+"""
+
+import logging
+import os
+from tools import tasks
+from tools.load_gen.load_gen import ILoadGenerator
+from conf import settings as S
+
+
+class QemuVM(tasks.Process):
+    """
+    Class for controling an instance of QEMU
+    """
+    def __init__(self, index):
+        self._running = False
+        self._logger = logging.getLogger(__name__)
+        self._number = index
+        pnumber = int(S.getValue('NN_BASE_VNC_PORT')) + self._number
+        cpumask = ",".join(S.getValue('NN_CORE_BINDING')[self._number])
+        self._monitor = '%s/vm%dmonitor' % ('/tmp', pnumber)
+        self._logfile = (os.path.join(S.getValue('LOG_DIR'),
+                                      S.getValue('NN_LOG_FILE')) +
+                         str(self._number))
+        self._log_prefix = 'vnf_%d_cmd : ' % pnumber
+        name = 'NN%d' % index
+        vnc = ':%d' % pnumber
+        self._shared_dir = '%s/qemu%d_share' % ('/tmp', pnumber)
+        if not os.path.exists(self._shared_dir):
+            try:
+                os.makedirs(self._shared_dir)
+            except OSError as exp:
+                raise OSError("Failed to create shared directory %s: %s",
+                              self._shared_dir, exp)
+
+        self.nics_nr = S.getValue('NN_NICS_NR')[self._number]
+        self.image = S.getValue('NN_IMAGE')[self._number]
+        self._cmd = ['sudo', '-E', 'taskset', '-c', cpumask,
+                     S.getValue('TOOLS')['qemu-system'],
+                     '-m', S.getValue('NN_MEMORY')[self._number],
+                     '-smp', S.getValue('NN_SMP')[self._number],
+                     '-cpu', 'host,migratable=off',
+                     '-drive', 'if={},file='.format(
+                         S.getValue('NN_BOOT_DRIVE_TYPE')[self._number]) +
+                     self.image, '-boot',
+                     'c', '--enable-kvm',
+                     '-monitor', 'unix:%s,server,nowait' % self._monitor,
+                     '-nographic', '-vnc', str(vnc), '-name', name,
+                     '-snapshot', '-net none', '-no-reboot',
+                     '-drive',
+                     'if=%s,format=raw,file=fat:rw:%s,snapshot=off' %
+                     (S.getValue('NN_SHARED_DRIVE_TYPE')[self._number],
+                      self._shared_dir)
+                    ]
+
+    def start(self):
+        """
+        Start QEMU instance
+        """
+        super(QemuVM, self).start()
+        self._running = True
+
+    def stop(self, sig, slp):
+        """
+        Stops VNF instance.
+        """
+        if self._running:
+            self._logger.info('Killing VNF...')
+            # force termination of VNF and wait to terminate; It will avoid
+            # sporadic reboot of host.
+            super(QemuVM, self).kill(signal=sig, sleep=slp)
+        # remove shared dir if it exists to avoid issues with file consistency
+        if os.path.exists(self._shared_dir):
+            tasks.run_task(['rm', '-f', '-r', self._shared_dir], self._logger,
+                           'Removing content of shared directory...', True)
+        self._running = False
+
+
+# pylint: disable=super-init-not-called
+class StressorVM(ILoadGenerator):
+    """
+    Wrapper Class for Load-Generation through stressor-vm
+    """
+    # pylint: disable=unused-argument
+    def __init__(self, config):
+        self.qvm_list = []
+        for vmindex in range(int(S.getValue('NN_COUNT'))):
+            qvm = QemuVM(vmindex)
+            self.qvm_list.append(qvm)
+
+    def start(self):
+        """Start stressor VMs
+        """
+        for nvm in self.qvm_list:
+            nvm.start()
+
+    def kill(self, signal='-9', sleep=2):
+        """
+        Stop Stressor VMs
+        """
+        for nvm in self.qvm_list:
+            nvm.stop(signal, sleep)