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# Copyright 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 QEMU hypervisor for launching virtio-net enabled guests.
"""
import logging
from vnfs.qemu.qemu import IVnfQemu
from conf import settings as S
from tools import tasks
class QemuVirtioNet(IVnfQemu):
"""
Control an instance of QEMU with virtio-net guest communication.
"""
def __init__(self):
"""
Initialisation function.
"""
super(QemuVirtioNet, self).__init__()
self._logger = logging.getLogger(__name__)
# insert vanilla ovs specific modules
tasks.run_task(['sudo', 'modprobe', 'vhost_net'], self._logger,
'Loading vhost_net module...', True)
# calculate index of first interface, i.e. check how many
# interfaces has been created for previous VMs, where 1st NIC
# of 1st VM has index 0
start_index = sum(S.getValue('GUEST_NICS_NR')[:self._number])
# multi-queue values
if int(S.getValue('GUEST_NIC_QUEUES')[self._number]):
queue_str = ',queues={}'.format(
S.getValue('GUEST_NIC_QUEUES')[self._number])
mq_vector_str = ',mq=on,vectors={}'.format(
int(S.getValue('GUEST_NIC_QUEUES')[self._number]) * 2 + 2)
else:
queue_str, mq_vector_str = '', ''
# setup requested number of interfaces
for nic in range(len(self._nics)):
index = start_index + nic
ifi = str(index)
self._cmd += ['-netdev', 'type=tap,id=' +
self._nics[nic]['device'] + queue_str +
',script=no,downscript=no,' +
'ifname=tap' + ifi + ',vhost=on',
'-device',
'virtio-net-pci,mac=' +
self._nics[nic]['mac'] + ',netdev=' +
self._nics[nic]['device'] +
',csum=off,gso=off,' +
'guest_tso4=off,guest_tso6=off,guest_ecn=off' +
mq_vector_str,
]
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