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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 for launching vhost-user enabled guests.
"""
import logging
from conf import settings as S
from vnfs.qemu.qemu import IVnfQemu
class QemuDpdkVhostUser(IVnfQemu):
"""
Control an instance of QEMU with vHost user guest communication.
"""
def __init__(self):
"""
Initialisation function.
"""
super(QemuDpdkVhostUser, self).__init__()
self._logger = logging.getLogger(__name__)
# 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 = '', ''
# Guest merge buffer setting
if S.getValue('GUEST_NIC_MERGE_BUFFERS_DISABLE')[self._number]:
if S.getValue('VSWITCH_JUMBO_FRAMES_ENABLED'):
self._logger.warning(
'Mergable buffers must be enabled for jumbo frames. Overriding.')
merge_buff = ''
else:
merge_buff = 'mrg_rxbuf=off,'
else:
merge_buff = ''
# 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])
# setup requested number of interfaces
for nic in range(len(self._nics)):
index = start_index + nic
ifi = str(index)
net = 'net' + str(index + 1)
# In case of testpmd as switch, path to vhost netdev folder will be set
# to tmp location instead of default ovs_var_tmp folder.
if S.getValue('VSWITCH') == 'none':
vhost_folder = '/tmp/'
else:
vhost_folder = S.getValue('TOOLS')['ovs_var_tmp']
nic_mode = '' if S.getValue('VSWITCH_VHOSTUSER_SERVER_MODE') else ',server'
self._cmd += ['-chardev',
'socket,id=char' + ifi +
',path=' + vhost_folder +
'dpdkvhostuser' + ifi + nic_mode,
'-netdev',
'type=vhost-user,id=' + net +
',chardev=char' + ifi + ',vhostforce' + queue_str,
'-device',
'virtio-net-pci,mac=' +
self._nics[nic]['mac'] +
',netdev=' + net + ',csum=off,' + merge_buff +
'gso=off,' +
'guest_tso4=off,guest_tso6=off,guest_ecn=off' +
mq_vector_str,
]
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