1 # Copyright 2015 Intel Corporation.
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
15 """Wrapper for an OVS bridge for convenient use of ``ovs-vsctl`` and
18 Much of this code is based on ``ovs-lib.py`` from Open Stack:
20 https://github.com/openstack/neutron/blob/6eac1dc99124ca024d6a69b3abfa3bc69c735667/neutron/agent/linux/ovs_lib.py
27 from tools import tasks
28 from conf import settings
30 _OVS_VSCTL_BIN = os.path.join(settings.getValue('OVS_DIR'), 'utilities',
32 _OVS_OFCTL_BIN = os.path.join(settings.getValue('OVS_DIR'), 'utilities',
35 _OVS_VAR_DIR = '/usr/local/var/run/openvswitch/'
37 _OVS_BRIDGE_NAME = settings.getValue('VSWITCH_BRIDGE_NAME')
40 """Add/remove/show datapaths using ``ovs-ofctl``.
42 def __init__(self, timeout=10):
45 :param timeout: Timeout to be used for each command
49 self.logger = logging.getLogger(__name__)
50 self.timeout = timeout
54 def run_vsctl(self, args, check_error=False):
55 """Run ``ovs-vsctl`` with supplied arguments.
57 :param args: Arguments to pass to ``ovs-vsctl``
58 :param check_error: Throw exception on error
62 cmd = ['sudo', _OVS_VSCTL_BIN, '--timeout', str(self.timeout)] + args
63 return tasks.run_task(
64 cmd, self.logger, 'Running ovs-vsctl...', check_error)
68 def add_br(self, br_name=_OVS_BRIDGE_NAME):
71 :param br_name: Name of bridge
73 :return: Instance of :class OFBridge:
75 self.logger.debug('add bridge')
76 self.run_vsctl(['add-br', br_name])
78 return OFBridge(br_name, self.timeout)
80 def del_br(self, br_name=_OVS_BRIDGE_NAME):
83 :param br_name: Name of bridge
87 self.logger.debug('delete bridge')
88 self.run_vsctl(['del-br', br_name])
91 class OFBridge(OFBase):
92 """Control a bridge instance using ``ovs-vsctl`` and ``ovs-ofctl``.
94 def __init__(self, br_name=_OVS_BRIDGE_NAME, timeout=10):
97 :param br_name: Bridge name
98 :param timeout: Timeout to be used for each command
102 super(OFBridge, self).__init__(timeout)
103 self.br_name = br_name
115 def __exit__(self, type_, value, traceback):
123 def run_ofctl(self, args, check_error=False):
124 """Run ``ovs-ofctl`` with supplied arguments.
126 :param args: Arguments to pass to ``ovs-ofctl``
127 :param check_error: Throw exception on error
131 cmd = ['sudo', _OVS_OFCTL_BIN, '-O', 'OpenFlow13', '--timeout',
132 str(self.timeout)] + args
133 return tasks.run_task(
134 cmd, self.logger, 'Running ovs-ofctl...', check_error)
139 self.logger.debug('create bridge')
140 self.add_br(self.br_name)
145 self.logger.debug('destroy bridge')
146 self.del_br(self.br_name)
151 self.logger.debug('reset bridge')
157 def add_port(self, port_name, params):
158 """Add port to bridge.
160 :param port_name: Name of port
161 :param params: Additional list of parameters to add-port
163 :return: OpenFlow port number for the port
165 self.logger.debug('add port')
166 self.run_vsctl(['add-port', self.br_name, port_name]+params)
168 # This is how port number allocation works currently
169 # This possibly will not work correctly if there are port deletions
171 of_port = len(self._ports) + 1
172 self._ports[port_name] = (of_port, params)
175 def del_port(self, port_name):
176 """Remove port from bridge.
178 :param port_name: Name of port
182 self.logger.debug('delete port')
183 self.run_vsctl(['del-port', self.br_name, port_name])
184 self._ports.pop(port_name)
186 def set_db_attribute(self, table_name, record, column, value):
187 """Set database attribute.
189 :param table_name: Name of table
190 :param record: Name of record
191 :param column: Name of column
192 :param value: Value to set
196 self.logger.debug('set attribute')
197 self.run_vsctl(['set', table_name, record, '%s=%s' % (column, value)])
200 """Get the ports of this bridge
202 Structure of the returned ports dictionary is
203 'portname': (openflow_port_number, extra_parameters)
208 (1, ['--', 'set', 'Interface', 'dpdkport0', 'type=dpdk']),
210 (2, ['--', 'set', 'Interface', 'dpdkvhostport0',
214 :return: Dictionary of ports
218 def clear_db_attribute(self, table_name, record, column):
219 """Clear database attribute.
221 :param table_name: Name of table
222 :param record: Name of record
223 :param column: Name of column
227 self.logger.debug('clear attribute')
228 self.run_vsctl(['clear', table_name, record, column])
232 def add_flow(self, flow):
233 """Add flow to bridge.
235 :param flow: Flow description as a dictionary
236 For flow dictionary structure, see function flow_key
240 if not flow.get('actions'):
241 self.logger.error('add flow requires actions')
244 self.logger.debug('add flow')
245 _flow_key = flow_key(flow)
246 self.logger.debug('key : %s', _flow_key)
247 self.run_ofctl(['add-flow', self.br_name, _flow_key])
249 def del_flow(self, flow):
250 """Delete flow from bridge.
252 :param flow: Flow description as a dictionary
253 For flow dictionary structure, see function flow_key
254 flow=None will delete all flows
258 self.logger.debug('delete flow')
259 _flow_key = flow_key(flow)
260 self.logger.debug('key : %s', _flow_key)
261 self.run_ofctl(['del-flows', self.br_name, _flow_key])
264 """Delete all flows from bridge.
266 self.logger.debug('delete flows')
267 self.run_ofctl(['del-flows', self.br_name])
269 def dump_flows(self):
270 """Dump all flows from bridge.
272 self.logger.debug('dump flows')
273 self.run_ofctl(['dump-flows', self.br_name])
280 """Model a flow key string for ``ovs-ofctl``.
282 Syntax taken from ``ovs-ofctl`` manpages:
283 http://openvswitch.org/cgi-bin/ovsman.cgi?page=utilities%2Fovs-ofctl.8
285 Example flow dictionary:
289 'actions': ['output:3']
292 :param flow: Flow description as a dictionary
297 _flow_add_key = string.Template('${fields},action=${actions}')
298 _flow_del_key = string.Template('${fields}')
302 user_params = (x for x in list(flow.items()) if x[0] != 'actions')
303 for (key, default) in user_params:
304 field_params.append('%(field)s=%(value)s' %
305 {'field': key, 'value': default})
307 field_params = ','.join(field_params)
310 'fields': field_params,
313 # no actions == delete key
314 if 'actions' in flow:
315 _flow_key_param['actions'] = ','.join(flow['actions'])
317 flow_str = _flow_add_key.substitute(_flow_key_param)
319 flow_str = _flow_del_key.substitute(_flow_key_param)