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# 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.
# 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.
"""Automation of system configuration for DPDK use.
Parts of this based on ``tools/dpdk_nic_bind.py`` script from Intel(R)
DPDK.
"""
from sys import platform as _platform
import os
import subprocess
import logging
from tools import tasks
from conf import settings
from tools.module_manager import ModuleManager
_LOGGER = logging.getLogger(__name__)
RTE_PCI_TOOL = os.path.join(
settings.getValue('RTE_SDK'), 'tools', 'dpdk_nic_bind.py')
_DPDK_MODULE_MANAGER = ModuleManager()
# declare global NIC variables only as their content might not be known yet
_NICS = []
_NICS_PCI = []
#
# system management
#
def init():
"""Setup system for DPDK.
"""
global _NICS
global _NICS_PCI
_NICS = settings.getValue('NICS')
_NICS_PCI = list(nic['pci'] for nic in _NICS)
if not _is_linux():
_LOGGER.error('Not running on a compatible Linux version. Exiting...')
return
_insert_modules()
_remove_vhost_net()
_bind_nics()
def cleanup():
"""Setup system for DPDK.
"""
if not _is_linux():
_LOGGER.error('Not running on a compatible Linux version. Exiting...')
return
_unbind_nics()
_remove_modules()
_vhost_user_cleanup()
#
# basic compatibility test
#
def _is_linux():
"""Check if running on Linux.
Many of the functions in this file rely on features commonly found
only on Linux (i.e. ``/proc`` is not present on FreeBSD). Hence, this
check is important to ensure someone doesn't run this on an incompatible
OS or distro.
"""
return _platform.startswith('linux') and os.path.isdir('/proc')
#
# module management
#
def _insert_modules():
"""Ensure required modules are inserted on system.
"""
_DPDK_MODULE_MANAGER.insert_modules(settings.getValue('SYS_MODULES'))
mod_path_prefix = settings.getValue('OVS_DIR')
_DPDK_MODULE_MANAGER.insert_module_group(settings.getValue('OVS_MODULES'),
mod_path_prefix)
if 'vfio-pci' not in settings.getValue('DPDK_MODULES'):
mod_path_prefix = os.path.join(settings.getValue('RTE_SDK'),
settings.getValue('RTE_TARGET'))
_DPDK_MODULE_MANAGER.insert_module_group(settings.getValue('DPDK_MODULES'),
mod_path_prefix)
else:
_DPDK_MODULE_MANAGER.insert_modules(settings.getValue('DPDK_MODULES'))
def _remove_modules():
"""Ensure required modules are removed from system.
"""
_DPDK_MODULE_MANAGER.remove_modules()
#
# vhost specific modules management
#
def insert_vhost_modules():
"""Inserts VHOST related kernel modules
"""
mod_path_prefix = os.path.join(settings.getValue('RTE_SDK'),
'lib',
'librte_vhost')
_DPDK_MODULE_MANAGER.insert_module_group(settings.getValue('VHOST_MODULE'), mod_path_prefix)
def remove_vhost_modules():
"""Removes all VHOST related kernel modules
"""
# all modules are removed automatically by _remove_modules() method
pass
#
# 'vhost-net' module cleanup
#
def _remove_vhost_net():
"""Remove vhost-net driver and file.
"""
_DPDK_MODULE_MANAGER.remove_module('vhost-net')
try:
tasks.run_task(['sudo', 'rm', '-f', '/dev/vhost-net'], _LOGGER,
'Removing \'/dev/vhost-net\' directory...', True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to remove directory \'/dev/vhost-net\'.')
#
# Vhost-user cleanup
#
def _vhost_user_cleanup():
"""Remove files created by vhost-user tests.
"""
for sock in settings.getValue('VHOST_USER_SOCKS'):
if os.path.exists(sock):
try:
tasks.run_task(['sudo', 'rm', sock],
_LOGGER,
'Deleting vhost-user socket \'%s\'...' %
sock,
True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to delete vhost-user socket \'%s\'.',
sock)
continue
#
# NIC management
#
def _bind_nics():
"""Bind NICs using the Intel DPDK ``dpdk_nic_bind.py`` tool.
"""
try:
_driver = 'igb_uio'
if 'vfio-pci' in settings.getValue('DPDK_MODULES'):
_driver = 'vfio-pci'
tasks.run_task(['sudo', 'chmod', 'a+x', '/dev/vfio'],
_LOGGER, 'Setting VFIO permissions .. a+x',
True)
tasks.run_task(['sudo', 'chmod', '-R', '666', '/dev/vfio/'],
_LOGGER, 'Setting VFIO permissions .. 0666',
True)
tasks.run_task(['sudo', RTE_PCI_TOOL, '--bind=' + _driver] +
_NICS_PCI, _LOGGER,
'Binding NICs %s...' % _NICS_PCI,
True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to bind NICs %s', str(_NICS_PCI))
def _unbind_nics():
"""Unbind NICs using the Intel DPDK ``dpdk_nic_bind.py`` tool.
"""
try:
tasks.run_task(['sudo', RTE_PCI_TOOL, '--unbind'] +
_NICS_PCI, _LOGGER,
'Unbinding NICs %s...' % str(_NICS_PCI),
True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to unbind NICs %s', str(_NICS_PCI))
# Rebind NICs to their original drivers
# using the Intel DPDK ``dpdk_nic_bind.py`` tool.
for nic in _NICS:
try:
if nic['driver']:
tasks.run_task(['sudo', RTE_PCI_TOOL, '--bind',
nic['driver'], nic['pci']],
_LOGGER, 'Binding NIC %s to %s...' %
(nic['pci'], nic['driver']),
True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to bind NIC %s to driver %s',
nic['pci'], nic['driver'])
class Dpdk(object):
"""A context manager for the system init/cleanup.
"""
def __enter__(self):
_LOGGER.info('Setting up DPDK')
init()
return self
def __exit__(self, type_, value, traceback):
_LOGGER.info('Cleaning up DPDK')
cleanup()
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