Vanilla OVS support implementation

JIRA: VSPERF-57

This patch implements Vanilla OVS support.It contains:
* New IVswitch implementation: OvsVanilla,
* New configuration contants,
* New mandatory configuration variable: VSWITCH_VANILLA_PHY_PORT_NAMES
for Vanilla OVS has been added,
* Virtual ports are not yet implemented,
* Some kernel modules wrapping methods has been moved from dpdk.py to
tools.
* Fixed bug where ovsdb hasn't been killed at the end of test case run on
some platforms.

Change-Id: I21a0d84dbc4004aae564d5547387a2563f2d1e5b
Signed-off-by: Michal Weglicki <michalx.weglicki@intel.com>
Reviewed-by: Eugene Snider <Eugene.Snider@huawei.com>
Reviewed-by: Gurpreet Singh <gurpreet.singh@spirent.com>
Reviewed-by: Tv Rao <tv.rao@freescale.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Billy O Mahony <billy.o.mahony@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/tools/module_manager.py b/tools/module_manager.py
new file mode 100644
index 00000000..6ed80e93
--- /dev/null
+++ b/tools/module_manager.py
@@ -0,0 +1,97 @@
+# Copyright 2015 Intel Corporation.
+#
+# 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.
+
+"""Simple kernel module manager implementation.
+"""
+
+import subprocess
+import logging
+from tools import tasks
+
+class KernelModuleInsertMode(object):
+    """Module manager type of insert definition.
+    """
+    MODPROBE = 1
+    INSMOD = 2 #NOT IMPLEMENTED
+
+class ModuleManager(object):
+    """Simple module manager which acts as system wrapper for Kernel Modules.
+    """
+
+    _logger = logging.getLogger(__name__)
+
+    def __init__(self, insert_mode=KernelModuleInsertMode.MODPROBE):
+        """Initializes data and sets insert mode.
+
+        :param insert_mode: insert mode defines how modules are going to
+                            be inserted in system.
+        """
+        self._modules = None
+        self._insert_mode = insert_mode
+
+    def insert_modules(self, modules):
+        """Method inserts list of modules using defined insert mode.
+
+        :param modules: list of modules to be inserted. Each element on
+                        list should represent format which is expected
+                        by KernelModuleInsertMode (e.g. for MODPROBE it
+                        would be module name).
+
+        :returns: None
+        """
+        self._modules = modules
+        for module in modules:
+            if ModuleManager.is_module_inserted(module):
+                continue
+
+            try:
+                if self._insert_mode == KernelModuleInsertMode.MODPROBE:
+                    tasks.run_task(['sudo', 'modprobe', module], self._logger,
+                                   'Inserting module \'%s\'...' % module, True)
+                else:
+                    self._logger.error(
+                        "Kernel module insert mode NOT IMPLEMENTED.")
+                    raise
+
+            except subprocess.CalledProcessError:
+                self._logger.error('Unable to insert module \'%s\'.', module)
+                raise  # fail catastrophically
+
+    def remove_modules(self):
+        """Removes all modules that have been previously instereted.
+        """
+        for module in self._modules:
+            # first check if module is loaded
+            if not ModuleManager.is_module_inserted(module):
+                continue
+
+            try:
+                tasks.run_task(['sudo', 'rmmod', module], self._logger,
+                               'Removing module \'%s\'...' % module, True)
+            except subprocess.CalledProcessError:
+                self._logger.error('Unable to remove module \'%s\'.', module)
+                continue
+
+    @staticmethod
+    def is_module_inserted(module):
+        """Check if a module is inserted on system.
+        """
+        with open('/proc/modules') as mod_file:
+            loaded_mods = mod_file.readlines()
+
+        # first check if module is loaded
+        for line in loaded_mods:
+            if line.startswith(module):
+                return True
+        return False