-# Copyright 2015 Intel Corporation.
+# Copyright 2015-2016 Intel Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
"""Simple kernel module manager implementation.
"""
-
+import os
import subprocess
import logging
+
from tools import tasks
class ModuleManager(object):
def __init__(self):
"""Initializes data
"""
- self._modules = None
+ self._modules = []
+
+ def insert_module(self, module, auto_remove=True):
+ """Method inserts given module.
+
+ In case that module name ends with .ko suffix then insmod will
+ be used for its insertion. Otherwise modprobe will be called.
+
+ :param module: a name of kernel module
+ :param auto_remove: if True (by default), then module will be
+ automatically removed by remove_modules() method
+ """
+ module_base_name = os.path.basename(os.path.splitext(module)[0])
+
+ if self.is_module_inserted(module):
+ self._logger.info('Module already loaded \'%s\'.', module_base_name)
+ # add it to internal list, so we can try to remove it at the end
+ if auto_remove:
+ self._modules.append(module)
+ return
+
+ try:
+ if module.endswith('.ko'):
+ # load module dependecies first, but suppress automatic
+ # module removal at the end; Just for case, that module
+ # depends on generic module
+ for depmod in self.get_module_dependecies(module):
+ self.insert_module(depmod, auto_remove=False)
+
+ tasks.run_task(['sudo', 'insmod', module], self._logger,
+ 'Insmod module \'%s\'...' % module_base_name, True)
+ else:
+ tasks.run_task(['sudo', 'modprobe', module], self._logger,
+ 'Modprobe module \'%s\'...' % module_base_name, True)
+ if auto_remove:
+ self._modules.append(module)
+ except subprocess.CalledProcessError:
+ # in case of error, show full module name
+ self._logger.error('Unable to insert module \'%s\'.', module)
+ raise # fail catastrophically
def insert_modules(self, modules):
- """Method inserts list of modules. In case that module name ends
- with .ko suffix then insmod will be used for its insertion. Otherwise
- modprobe will be called.
+ """Method inserts list of modules.
- :returns: None
+ :param modules: a list of modules to be inserted
"""
- self._modules = modules
for module in modules:
- if ModuleManager.is_module_inserted(module):
- continue
+ self.insert_module(module)
- try:
- if module.endswith('.ko'):
- tasks.run_task(['sudo', 'insmod', module], self._logger,
- 'Insmod module \'%s\'...' % module, True)
- else:
- tasks.run_task(['sudo', 'modprobe', module], self._logger,
- 'Modprobe module \'%s\'...' % module, True)
+ def remove_module(self, module):
+ """Removes a single module.
- 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.
+ :param module: a name of kernel module
"""
- for module in self._modules:
- # first check if module is loaded
- if not ModuleManager.is_module_inserted(module):
- continue
+ if self.is_module_inserted(module):
+ # get module base name, i.e strip path and .ko suffix if possible
+ module_base_name = os.path.basename(os.path.splitext(module)[0])
try:
- # rmmod supports both simple module name and full module path
- # with .ko suffix
- tasks.run_task(['sudo', 'rmmod', module], self._logger,
- 'Removing module \'%s\'...' % module, True)
+ self._logger.info('Removing module \'%s\'...', module_base_name)
+ subprocess.check_call('sudo rmmod {}'.format(module_base_name),
+ shell=True, stderr=subprocess.DEVNULL)
+ # in case that module was loaded automatically by modprobe
+ # to solve dependecies, then it is not in internal list of modules
+ if module in self._modules:
+ self._modules.remove(module)
except subprocess.CalledProcessError:
- self._logger.error('Unable to remove module \'%s\'.', module)
- continue
+ # in case of error, show full module name...
+ self._logger.info('Unable to remove module \'%s\'.', module)
+ # ...and list of dependend modules, if there are any
+ module_details = self.get_module_details(module_base_name)
+ if module_details:
+ mod_dep = module_details.split(' ')[3].rstrip(',')
+ if mod_dep[0] != '-':
+ self._logger.debug('Module \'%s\' is used by module(s) \'%s\'.',
+ module_base_name, mod_dep)
- @staticmethod
- def is_module_inserted(module):
+ def remove_modules(self):
+ """Removes all modules that have been previously inserted.
+ """
+ # remove modules in reverse order to respect their dependencies
+ for module in reversed(self._modules):
+ self.remove_module(module)
+
+ def is_module_inserted(self, module):
"""Check if a module is inserted on system.
+
+ :param module: a name of kernel module
"""
- # get module base name, i.e strip path and .ko suffix if possible
- module_base_name = module.split('.')[0].split('/').pop()
+ module_base_name = os.path.basename(os.path.splitext(module)[0])
+
+ return self.get_module_details(module_base_name) != None
+
+ @staticmethod
+ def get_module_details(module):
+ """Return details about given module
+ :param module: a name of kernel module
+ :returns: In case that module is loaded in OS, then corresponding
+ line from /proc/modules will be returned. Otherwise it returns None.
+ """
# get list of modules from kernel
with open('/proc/modules') as mod_file:
loaded_mods = mod_file.readlines()
- # first check if module is loaded
+ # check if module is loaded
for line in loaded_mods:
- if line.startswith(module_base_name):
- return True
- return False
+ # underscores '_' and dashes '-' in module names are interchangeable, so we
+ # have to normalize module names before comparision
+ if line.split(' ')[0].replace('-', '_') == module.replace('-', '_'):
+ return line
+
+ return None
+
+ @staticmethod
+ def get_module_dependecies(module):
+ """Return list of modules, which must be loaded before module itself
+
+ :param module: a name of kernel module
+ :returns: In case that module has any dependencies, then list of module
+ names will be returned. Otherwise it returns empty list, i.e. [].
+ """
+ deps = ''
+ try:
+ # get list of module dependecies from kernel
+ deps = subprocess.check_output('modinfo -F depends {}'.format(module),
+ shell=True).decode().rstrip('\n')
+ except subprocess.CalledProcessError:
+ # in case of error, show full module name...
+ self._logger.info('Unable to get list of dependecies for module \'%s\'.', module)
+ # ...and try to continue, just for case that dependecies are already loaded
+
+ if len(deps):
+ return deps.split(',')
+ else:
+ return []
Code Review / vswitchperf.git / blobdiff