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# 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.
"""Automation of QEMU hypervisor with direct access to host NICs via
PCI passthrough.
"""
import logging
import subprocess
import os
from conf import settings as S
from vnfs.qemu.qemu import IVnfQemu
from tools import tasks
from tools.module_manager import ModuleManager
_MODULE_MANAGER = ModuleManager()
_RTE_PCI_TOOL = os.path.join(S.getValue('RTE_SDK'), 'tools', 'dpdk_nic_bind.py')
class QemuPciPassthrough(IVnfQemu):
"""
Control an instance of QEMU with direct access to the host network devices
"""
def __init__(self):
"""
Initialization function.
"""
super(QemuPciPassthrough, self).__init__()
self._logger = logging.getLogger(__name__)
self._nics = S.getValue('NICS')
# in case of SRIOV and PCI passthrough we must ensure, that MAC addresses are swapped
if S.getValue('SRIOV_ENABLED') and not self._testpmd_fwd_mode.startswith('mac'):
self._logger.info("SRIOV detected, forwarding mode of testpmd was changed from '%s' to '%s'",
self._testpmd_fwd_mode, 'mac_retry')
self._testpmd_fwd_mode = 'mac_retry'
for nic in self._nics:
self._cmd += ['-device', 'vfio-pci,host=' + nic['pci']]
def start(self):
"""
Start QEMU instance, bind host NICs to vfio-pci driver
"""
# load vfio-pci
_MODULE_MANAGER.insert_modules(['vfio-pci'])
# bind every interface to vfio-pci driver
try:
nics_list = list(tmp_nic['pci'] for tmp_nic in self._nics)
tasks.run_task(['sudo', _RTE_PCI_TOOL, '--bind=vfio-pci'] + nics_list,
self._logger, 'Binding NICs %s...' % nics_list, True)
except subprocess.CalledProcessError:
self._logger.error('Unable to bind NICs %s', self._nics)
super(QemuPciPassthrough, self).start()
def stop(self):
"""
Stop QEMU instance, bind host NICs to the original driver
"""
super(QemuPciPassthrough, self).stop()
# bind original driver to every interface
for nic in self._nics:
if nic['driver']:
try:
tasks.run_task(['sudo', _RTE_PCI_TOOL, '--bind=' + nic['driver'], nic['pci']],
self._logger, 'Binding NIC %s...' % nic['pci'], True)
except subprocess.CalledProcessError:
self._logger.error('Unable to bind NIC %s to driver %s', nic['pci'], nic['driver'])
# unload vfio-pci driver
_MODULE_MANAGER.remove_modules()
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