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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.
"""VSPERF VSwitch implementation using DPDK and vhost ports
"""
import logging
import subprocess
import os
from src.ovs import OFBridge
from src.dpdk import dpdk
from conf import settings
from vswitches.ovs import IVSwitchOvs
class OvsDpdkVhost(IVSwitchOvs):
""" Open vSwitch with DPDK support
Generic OVS wrapper functionality in src.ovs is maximally used. This
class wraps DPDK system configuration along with DPDK specific OVS
parameters
The method docstrings document only considerations specific to this
implementation. For generic information of the nature of the methods,
see the interface.
"""
def __init__(self):
super(OvsDpdkVhost, self).__init__()
self._logger = logging.getLogger(__name__)
vswitchd_args = []
# legacy DPDK configuration through --dpdk option of vswitchd
if self.old_dpdk_config():
vswitchd_args = ['--dpdk'] + settings.getValue('VSWITCHD_DPDK_ARGS')
if self._vswitchd_args:
self._vswitchd_args = vswitchd_args + ['--'] + self._vswitchd_args
else:
self._vswitchd_args = vswitchd_args
def configure(self):
""" Configure vswitchd DPDK options through ovsdb if needed
"""
dpdk_config = settings.getValue('VSWITCHD_DPDK_CONFIG')
if dpdk_config and not self.old_dpdk_config():
# enforce calls to ovs-vsctl with --no-wait
tmp_br = OFBridge(timeout=-1)
for option in dpdk_config:
tmp_br.set_db_attribute('Open_vSwitch', '.',
'other_config:' + option, dpdk_config[option])
def start(self):
"""See IVswitch for general description
Activates DPDK kernel modules, ovsdb and vswitchd.
"""
dpdk.init()
super(OvsDpdkVhost, self).start()
# old style OVS <= 2.5.0 multi-queue enable
if settings.getValue('OVS_OLD_STYLE_MQ') and \
int(settings.getValue('VSWITCH_MULTI_QUEUES')):
tmp_br = OFBridge(timeout=-1)
tmp_br.set_db_attribute(
'Open_vSwitch', '.', 'other_config:' +
'n-dpdk-rxqs', settings.getValue('VSWITCH_MULTI_QUEUES'))
def stop(self):
"""See IVswitch for general description
Kills ovsdb and vswitchd and removes DPDK kernel modules.
"""
super(OvsDpdkVhost, self).stop()
dpdk.cleanup()
dpdk.remove_vhost_modules()
def add_switch(self, switch_name, params=None):
"""See IVswitch for general description
"""
switch_params = ['--', 'set', 'bridge', switch_name, 'datapath_type=netdev']
if params:
switch_params = switch_params + params
super(OvsDpdkVhost, self).add_switch(switch_name, switch_params)
if settings.getValue('VSWITCH_AFFINITIZATION_ON') == 1:
# Sets the PMD core mask to VSWITCH_PMD_CPU_MASK
# for CPU core affinitization
self._bridges[switch_name].set_db_attribute('Open_vSwitch', '.',
'other_config:pmd-cpu-mask',
settings.getValue('VSWITCH_PMD_CPU_MASK'))
def add_phy_port(self, switch_name):
"""See IVswitch for general description
Creates a port of type dpdk.
The new port is named dpdk<n> where n is an integer starting from 0.
"""
bridge = self._bridges[switch_name]
dpdk_count = self._get_port_count('type=dpdk')
port_name = 'dpdk' + str(dpdk_count)
params = ['--', 'set', 'Interface', port_name, 'type=dpdk']
# multi-queue enable
if int(settings.getValue('VSWITCH_MULTI_QUEUES')) and \
not settings.getValue('OVS_OLD_STYLE_MQ'):
params += ['options:n_rxq={}'.format(
settings.getValue('VSWITCH_MULTI_QUEUES'))]
of_port = bridge.add_port(port_name, params)
return (port_name, of_port)
def add_vport(self, switch_name):
"""See IVswitch for general description
Creates a port of type dpdkvhost
The new port is named dpdkvhost<n> where n is an integer starting
from 0
"""
bridge = self._bridges[switch_name]
vhost_count = self._get_port_count('type=dpdkvhostuser')
port_name = 'dpdkvhostuser' + str(vhost_count)
params = ['--', 'set', 'Interface', port_name, 'type=dpdkvhostuser']
# multi queue enable
if int(settings.getValue('VSWITCH_MULTI_QUEUES')) and \
not settings.getValue('OVS_OLD_STYLE_MQ'):
params += ['options:n_rxq={}'.format(
settings.getValue('VSWITCH_MULTI_QUEUES'))]
of_port = bridge.add_port(port_name, params)
return (port_name, of_port)
@staticmethod
def old_dpdk_config():
"""Checks if ovs-vswitchd uses legacy dpdk configuration via --dpdk option
:returns: True if legacy --dpdk option is supported, otherwise it returns False
"""
ovs_vswitchd_bin = os.path.join(settings.getValue('OVS_DIR'), 'vswitchd', 'ovs-vswitchd')
try:
subprocess.check_output(ovs_vswitchd_bin + r' --help | grep "\-\-dpdk"', shell=True)
return True
except subprocess.CalledProcessError:
return False
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