2 # Copyright (C) 2013 Nicira, Inc. All Rights Reserved.
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at:
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
17 # - Doesn't support multicast other than "unknown-dst"
29 import ovs.unixctl.server
31 from six.moves import range
39 __pychecker__ = 'no-reuseattr' # Remove in pychecker >= 0.8.19.
40 vlog = ovs.vlog.Vlog("ovs-vtep")
50 bfd_bridge = "vtep_bfd"
54 def call_prog(prog, args_list):
55 cmd = [prog, "-vconsole:off"] + args_list
56 output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
57 if len(output) == 0 or output[0] is None:
60 output = output[0].decode().strip()
65 return call_prog("ovs-vsctl", shlex.split(args))
69 return call_prog("ovs-ofctl", shlex.split(args))
73 return call_prog("vtep-ctl", shlex.split(args))
76 def unixctl_exit(conn, unused_argv, unused_aux):
82 class Logical_Switch(object):
83 def __init__(self, ls_name, ps_name):
87 self.short_name = ps_name + "_vtep_ls" + str(ls_count)
88 vlog.info("creating lswitch %s (%s)" % (self.name, self.short_name))
91 self.local_macs = set()
93 self.unknown_dsts = set()
95 self.replication_mode = "service_node"
98 vlog.info("destroying lswitch %s" % self.name)
103 ovs_vsctl("--may-exist add-br %s -- set Bridge %s datapath_type=%s"
104 % (self.short_name, self.short_name, ps_type))
106 ovs_vsctl("--may-exist add-br %s" % self.short_name)
108 ovs_vsctl("br-set-external-id %s vtep_logical_switch true"
110 ovs_vsctl("br-set-external-id %s logical_switch_name %s"
111 % (self.short_name, self.name))
113 vtep_ctl("clear-local-macs %s" % self.name)
114 vtep_ctl("add-mcast-local %s unknown-dst %s" % (self.name, Tunnel_Ip))
116 ovs_ofctl("del-flows %s" % self.short_name)
117 ovs_ofctl("add-flow %s priority=0,action=drop" % self.short_name)
119 def cleanup_ls(self):
120 for port_no, tun_name, remote_ip in six.itervalues(self.tunnels):
123 def update_flood(self):
124 flood_ports = list(self.ports.values())
126 # Traffic flowing from one 'unknown-dst' should not be flooded to
127 # port belonging to another 'unknown-dst'.
128 for tunnel in self.unknown_dsts:
129 port_no = self.tunnels[tunnel][0]
130 ovs_ofctl("add-flow %s table=1,priority=1,in_port=%s,action=%s"
131 % (self.short_name, port_no, ",".join(flood_ports)))
133 # Traffic coming from a VTEP physical port should always be flooded to
134 # all the other physical ports that belong to that VTEP device and
135 # this logical switch. If the replication mode is service node then
136 # send to one unknown_dst node (the first one here); else we assume the
137 # replication mode is source node and we send the packet to all
139 for tunnel in self.unknown_dsts:
140 port_no = self.tunnels[tunnel][0]
141 flood_ports.append(port_no)
142 if self.replication_mode == "service_node":
145 ovs_ofctl("add-flow %s table=1,priority=0,action=%s"
146 % (self.short_name, ",".join(flood_ports)))
148 def add_lbinding(self, lbinding):
149 vlog.info("adding %s binding to %s" % (lbinding, self.name))
150 port_no = ovs_vsctl("get Interface %s ofport" % lbinding)
151 self.ports[lbinding] = port_no
152 ovs_ofctl("add-flow %s in_port=%s,action=learn(table=1,"
153 "priority=1000,idle_timeout=15,cookie=0x5000,"
154 "NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[],"
155 "output:NXM_OF_IN_PORT[]),resubmit(,1)"
156 % (self.short_name, port_no))
160 def del_lbinding(self, lbinding):
161 vlog.info("removing %s binding from %s" % (lbinding, self.name))
162 port_no = self.ports[lbinding]
163 ovs_ofctl("del-flows %s in_port=%s" % (self.short_name, port_no))
164 del self.ports[lbinding]
167 def add_tunnel(self, tunnel, tunnel_key):
169 vlog.info("adding tunnel %s" % tunnel)
170 encap, ip = tunnel.split("/")
172 if encap != "vxlan_over_ipv4":
173 vlog.warn("unsupported tunnel format %s" % encap)
177 tun_name = "vx" + str(tun_id)
179 ovs_vsctl("add-port %s %s -- set Interface %s type=vxlan "
180 "options:key=%s options:remote_ip=%s"
181 % (self.short_name, tun_name, tun_name, tunnel_key, ip))
184 port_no = ovs_vsctl("get Interface %s ofport" % tun_name)
188 vlog.warn("couldn't create tunnel %s" % tunnel)
189 ovs_vsctl("del-port %s %s" % (self.short_name, tun_name))
192 # Give the system a moment to allocate the port number
195 self.tunnels[tunnel] = (port_no, tun_name, ip)
199 ovs_ofctl("add-flow %s table=0,priority=1000,in_port=%s,"
200 "actions=resubmit(,1)"
201 % (self.short_name, port_no))
203 def del_tunnel(self, tunnel):
204 vlog.info("removing tunnel %s" % tunnel)
206 port_no, tun_name, remote_ip = self.tunnels[tunnel]
207 ovs_ofctl("del-flows %s table=0,in_port=%s"
208 % (self.short_name, port_no))
209 ovs_vsctl("del-port %s %s" % (self.short_name, tun_name))
213 del self.tunnels[tunnel]
215 def update_local_macs(self):
216 flows = ovs_ofctl("dump-flows %s cookie=0x5000/-1,table=1"
217 % self.short_name).splitlines()
220 mac = re.split(r'.*dl_dst=(.*) .*', f)
224 for mac in macs.difference(self.local_macs):
225 vlog.info("adding local ucast %s to %s" % (mac, self.name))
226 vtep_ctl("add-ucast-local %s %s %s" % (self.name, mac, Tunnel_Ip))
228 for mac in self.local_macs.difference(macs):
229 vlog.info("removing local ucast %s from %s" % (mac, self.name))
230 vtep_ctl("del-ucast-local %s %s" % (self.name, mac))
232 self.local_macs = macs
234 def add_remote_mac(self, mac, tunnel):
235 port_no = self.tunnels.get(tunnel, (0, ""))[0]
239 ovs_ofctl("add-flow %s table=1,priority=1000,dl_dst=%s,action=%s"
240 % (self.short_name, mac, port_no))
242 def del_remote_mac(self, mac):
243 ovs_ofctl("del-flows %s table=1,dl_dst=%s" % (self.short_name, mac))
245 def update_remote_macs(self):
251 column = vtep_ctl("--columns=tunnel_key find logical_switch "
252 "name=%s" % self.name)
253 tunnel_key = column.partition(":")[2].strip()
254 if tunnel_key and isinstance(eval(tunnel_key), six.integer_types):
255 vlog.info("update_remote_macs: using tunnel key %s in %s"
256 % (tunnel_key, self.name))
258 vlog.info("Invalid tunnel key %s in %s post VTEP DB requery"
259 % (tunnel_key, self.name))
262 mac_list = vtep_ctl("list-remote-macs %s" % self.name).splitlines()
263 for line in mac_list:
264 if (line.find("mcast-mac-remote") != -1):
268 entry = re.split(r' (.*) -> (.*)', line)
273 remote_macs[entry[1]] = entry[2]
275 if entry[1] != "unknown-dst":
278 unknown_dsts.add(entry[2])
280 tunnels.add(entry[2])
282 old_tunnels = set(self.tunnels.keys())
284 for tunnel in tunnels.difference(old_tunnels):
285 self.add_tunnel(tunnel, tunnel_key)
287 for tunnel in old_tunnels.difference(tunnels):
288 self.del_tunnel(tunnel)
290 for mac in six.iterkeys(remote_macs):
291 if (self.remote_macs.get(mac) != remote_macs[mac]):
292 self.add_remote_mac(mac, remote_macs[mac])
294 for mac in six.iterkeys(self.remote_macs):
295 if mac not in remote_macs:
296 self.del_remote_mac(mac)
298 self.remote_macs = remote_macs
300 replication_mode = vtep_ctl("get logical_switch %s replication_mode"
303 # Replication mode is an optional column and if it is not set,
304 # replication mode defaults to service_node.
305 if replication_mode == "[]":
306 replication_mode = "service_node"
308 # If the logical switch level replication mode has changed then
309 # update to that value.
310 update_flood_set = False
311 if replication_mode != self.replication_mode:
312 self.replication_mode = replication_mode
313 vlog.info("%s replication mode changed to %s" %
314 (self.name, self.replication_mode))
315 update_flood_set = True
317 if (self.unknown_dsts != unknown_dsts):
318 self.unknown_dsts = unknown_dsts
319 update_flood_set = True
321 # If either the replication mode has changed or the unknown
322 # destinations set has changed, update the flooding decision.
323 if update_flood_set is True:
326 def update_stats(self):
327 # Map Open_vSwitch's "interface:statistics" to columns of
328 # vtep's logical_binding_stats. Since we are using the 'interface' from
329 # the logical switch to collect stats, packets transmitted from it
330 # is received in the physical switch and vice versa.
331 stats_map = {'tx_packets': 'packets_to_local',
332 'tx_bytes': 'bytes_to_local',
333 'rx_packets': 'packets_from_local',
334 'rx_bytes': 'bytes_from_local'}
336 # Go through all the logical switch's interfaces that end with "-l"
337 # and copy the statistics to logical_binding_stats.
338 for interface in six.iterkeys(self.ports):
339 if not interface.endswith("-l"):
341 # Physical ports can have a '-' as part of its name.
342 vlan, remainder = interface.split("-", 1)
343 pp_name, logical = remainder.rsplit("-", 1)
344 uuid = vtep_ctl("get physical_port %s vlan_stats:%s"
349 for mapfrom, mapto in six.iteritems(stats_map):
350 value = ovs_vsctl("get interface %s statistics:%s"
351 % (interface, mapfrom)).strip('"')
352 vtep_ctl("set logical_binding_stats %s %s=%s"
353 % (uuid, mapto, value))
356 self.update_local_macs()
357 self.update_remote_macs()
361 def get_vtep_tunnel(remote_ip):
362 # Get the physical_locator record for the local tunnel end point.
363 column = vtep_ctl("--columns=_uuid find physical_locator "
364 "dst_ip=%s" % Tunnel_Ip)
365 local = column.partition(":")[2].strip()
367 return (None, None, None)
369 # Get the physical_locator record for the remote tunnel end point.
370 column = vtep_ctl("--columns=_uuid find physical_locator "
371 "dst_ip=%s" % remote_ip)
372 remote = column.partition(":")[2].strip()
374 return (None, None, None)
376 column = vtep_ctl("--columns=_uuid find tunnel "
377 "local=%s remote=%s" % (local, remote))
378 tunnel = column.partition(":")[2].strip()
380 return (local, remote, tunnel)
383 def create_vtep_tunnel(remote_ip):
384 local, remote, tunnel = get_vtep_tunnel(remote_ip)
385 if not local or not remote:
389 vlog.info("creating tunnel record in vtep for remote_ip:%s"
391 tunnel = vtep_ctl("add physical_switch %s tunnels @tun -- "
392 "--id=@tun create Tunnel local=%s remote=%s"
393 % (ps_name, local, remote))
397 def destroy_vtep_tunnel(remote_ip):
398 local, remote, tunnel = get_vtep_tunnel(remote_ip)
400 vlog.info("destroying tunnel record in vtep for remote_ip:%s"
402 vtep_ctl("remove physical_switch %s tunnels %s "
403 "-- --if-exists destroy tunnel %s"
404 % (ps_name, tunnel, tunnel))
407 def add_bfd(remote_ip):
408 # The VTEP emulator creates one OVS bridge for every logical switch.
409 # Multiple logical switches can have multiple OVS tunnels to the
410 # same machine (with different tunnel ids). But VTEP schema expects
411 # a single BFD session between two physical locators. Therefore
412 # create a separate bridge ('bfd_bridge') and create a single OVS tunnel
413 # between two phsyical locators (using reference counter).
414 if remote_ip in bfd_ref:
415 bfd_ref[remote_ip] += 1
418 vlog.info("adding bfd tunnel for remote_ip:%s" % remote_ip)
420 port_name = "bfd" + remote_ip
421 # Don't enable BFD yet. Enabling or disabling BFD is based on
422 # the controller setting a value in VTEP DB's tunnel record.
423 ovs_vsctl("--may-exist add-port %s %s "
424 " -- set Interface %s type=vxlan options:remote_ip=%s"
425 % (bfd_bridge, port_name, port_name, remote_ip))
426 bfd_ref[remote_ip] = 1
428 # Ideally, we should create a 'tunnel' record in the VTEP DB here.
429 # To create a 'tunnel' record, we need 2 entries in 'physical_locator'
430 # table (one for local and one for remote). But, 'physical_locator'
431 # can be created/destroyed asynchronously when the remote controller
432 # adds/removes entries in Ucast_Macs_Remote table. To prevent race
433 # conditions, pass the responsibility of creating a 'tunnel' record
434 # to run_bfd() which runs more often.
437 def del_bfd(remote_ip):
438 if remote_ip in bfd_ref:
439 if bfd_ref[remote_ip] == 1:
440 port_name = "bfd" + remote_ip
441 vlog.info("deleting bfd tunnel for remote_ip:%s" % remote_ip)
442 ovs_vsctl("--if-exists del-port %s" % port_name)
443 destroy_vtep_tunnel(remote_ip)
444 del bfd_ref[remote_ip]
446 bfd_ref[remote_ip] -= 1
450 bfd_ports = ovs_vsctl("list-ports %s" % bfd_bridge).split()
451 for port in bfd_ports:
452 remote_ip = ovs_vsctl("get interface %s options:remote_ip" % port)
453 tunnel = create_vtep_tunnel(remote_ip)
457 bfd_params_default = {'bfd_params:enable': 'false',
458 'bfd_params:min_rx': 1000,
459 'bfd_params:min_tx': 100,
460 'bfd_params:decay_min_rx': 0,
461 'bfd_params:cpath_down': 'false',
462 'bfd_params:check_tnl_key': 'false'}
463 bfd_params_values = {}
465 for key, default in six.iteritems(bfd_params_default):
466 column = vtep_ctl("--if-exists get tunnel %s %s"
469 bfd_params_values[key] = default
471 bfd_params_values[key] = column
473 for key, value in six.iteritems(bfd_params_values):
474 new_key = key.replace('_params', '')
475 ovs_vsctl("set interface %s %s=%s" % (port, new_key, value))
477 bfd_status = ['bfd_status:state', 'bfd_status:forwarding',
478 'bfd_status:diagnostic', 'bfd_status:remote_state',
479 'bfd_status:remote_diagnostic']
480 for key in bfd_status:
481 value = ovs_vsctl("--if-exists get interface %s %s" % (port, key))
483 vtep_ctl("set tunnel %s %s=%s" % (tunnel, key, value))
485 new_key = key.replace('bfd_status:', '')
486 vtep_ctl("remove tunnel %s bfd_status %s" % (tunnel, new_key))
488 vtep_ctl("set tunnel %s bfd_status:enabled=%s"
489 % (tunnel, bfd_params_values['bfd_params:enable']))
491 # Add the defaults as described in VTEP schema to make it explicit.
492 bfd_lconf_default = {'bfd_config_local:bfd_dst_ip': '169.254.1.0',
493 'bfd_config_local:bfd_dst_mac':
495 for key, value in six.iteritems(bfd_lconf_default):
496 vtep_ctl("set tunnel %s %s=%s" % (tunnel, key, value))
498 # bfd_config_remote options from VTEP DB should be populated to
499 # corresponding OVS DB values.
500 bfd_dst_ip = vtep_ctl("--if-exists get tunnel %s "
501 "bfd_config_remote:bfd_dst_ip" % (tunnel))
503 bfd_dst_ip = "169.254.1.1"
505 bfd_dst_mac = vtep_ctl("--if-exists get tunnel %s "
506 "bfd_config_remote:bfd_dst_mac" % (tunnel))
508 bfd_dst_mac = "00:23:20:00:00:01"
510 ovs_vsctl("set interface %s bfd:bfd_dst_ip=%s "
511 "bfd:bfd_remote_dst_mac=%s bfd:bfd_local_dst_mac=%s"
513 bfd_lconf_default['bfd_config_local:bfd_dst_mac'],
517 def add_binding(binding, ls):
518 vlog.info("adding binding %s" % binding)
520 vlan, pp_name = binding.split("-", 1)
521 pbinding = binding + "-p"
522 lbinding = binding + "-l"
524 # Create a patch port that connects the VLAN+port to the lswitch.
525 # Do them as two separate calls so if one side already exists, the
526 # other side is created.
527 ovs_vsctl("add-port %s %s "
528 " -- set Interface %s type=patch options:peer=%s"
529 % (ps_name, pbinding, pbinding, lbinding))
530 ovs_vsctl("add-port %s %s "
531 " -- set Interface %s type=patch options:peer=%s"
532 % (ls.short_name, lbinding, lbinding, pbinding))
534 port_no = ovs_vsctl("get Interface %s ofport" % pp_name)
535 patch_no = ovs_vsctl("get Interface %s ofport" % pbinding)
536 vlan_ = vlan.lstrip('0')
538 ovs_ofctl("add-flow %s in_port=%s,dl_vlan=%s,action=strip_vlan,%s"
539 % (ps_name, port_no, vlan_, patch_no))
540 ovs_ofctl("add-flow %s in_port=%s,action=mod_vlan_vid:%s,%s"
541 % (ps_name, patch_no, vlan_, port_no))
543 ovs_ofctl("add-flow %s in_port=%s,action=%s"
544 % (ps_name, port_no, patch_no))
545 ovs_ofctl("add-flow %s in_port=%s,action=%s"
546 % (ps_name, patch_no, port_no))
548 # Create a logical_bindings_stats record.
551 vtep_ctl("set physical_port %s vlan_stats:%s=@stats -- "
552 "--id=@stats create logical_binding_stats packets_from_local=0"
555 ls.add_lbinding(lbinding)
556 Bindings[binding] = ls.name
559 def del_binding(binding, ls):
560 vlog.info("removing binding %s" % binding)
562 vlan, pp_name = binding.split("-", 1)
563 pbinding = binding + "-p"
564 lbinding = binding + "-l"
566 port_no = ovs_vsctl("get Interface %s ofport" % pp_name)
567 patch_no = ovs_vsctl("get Interface %s ofport" % pbinding)
568 vlan_ = vlan.lstrip('0')
570 ovs_ofctl("del-flows %s in_port=%s,dl_vlan=%s"
571 % (ps_name, port_no, vlan_))
572 ovs_ofctl("del-flows %s in_port=%s" % (ps_name, patch_no))
574 ovs_ofctl("--strict del-flows %s in_port=%s" % (ps_name, port_no))
575 ovs_ofctl("--strict del-flows %s in_port=%s" % (ps_name, patch_no))
577 ls.del_lbinding(lbinding)
579 # Destroy the patch port that connects the VLAN+port to the lswitch
580 ovs_vsctl("del-port %s %s -- del-port %s %s"
581 % (ps_name, pbinding, ls.short_name, lbinding))
583 # Remove the record that links vlan with stats in logical_binding_stats.
584 vtep_ctl("remove physical_port %s vlan_stats %s" % (pp_name, vlan))
586 del Bindings[binding]
589 def handle_physical():
590 # Gather physical ports except the patch ports we created
591 ovs_ports = ovs_vsctl("list-ports %s" % ps_name).split()
592 ovs_port_set = set([port for port in ovs_ports if port[-2:] != "-p"])
594 vtep_pp_set = set(vtep_ctl("list-ports %s" % ps_name).split())
596 for pp_name in ovs_port_set.difference(vtep_pp_set):
597 vlog.info("adding %s to %s" % (pp_name, ps_name))
598 vtep_ctl("add-port %s %s" % (ps_name, pp_name))
600 for pp_name in vtep_pp_set.difference(ovs_port_set):
601 vlog.info("deleting %s from %s" % (pp_name, ps_name))
602 vtep_ctl("del-port %s %s" % (ps_name, pp_name))
605 for pp_name in vtep_pp_set:
606 binding_set = set(vtep_ctl("list-bindings %s %s"
607 % (ps_name, pp_name)).splitlines())
609 for b in binding_set:
610 vlan, ls_name = b.split()
611 if ls_name not in Lswitches:
612 Lswitches[ls_name] = Logical_Switch(ls_name, ps_name)
614 binding = "%s-%s" % (vlan, pp_name)
615 ls = Lswitches[ls_name]
616 new_bindings.add(binding)
618 if binding in Bindings:
619 if Bindings[binding] == ls_name:
622 del_binding(binding, Lswitches[Bindings[binding]])
624 add_binding(binding, ls)
626 dead_bindings = set(Bindings.keys()).difference(new_bindings)
627 for binding in dead_bindings:
628 ls_name = Bindings[binding]
629 ls = Lswitches[ls_name]
631 del_binding(binding, ls)
633 if not len(ls.ports):
635 ovs_vsctl("del-br %s" % Lswitches[ls_name].short_name)
636 vtep_ctl("clear-local-macs %s" % Lswitches[ls_name].name)
637 del Lswitches[ls_name]
641 br_list = ovs_vsctl("list-br").split()
642 if (ps_name not in br_list):
643 ovs.util.ovs_fatal(0, "couldn't find OVS bridge %s" % ps_name, vlog)
646 ps_type = ovs_vsctl("get Bridge %s datapath_type" % ps_name).strip('"')
648 call_prog("vtep-ctl", ["set", "physical_switch", ps_name,
649 'description="OVS VTEP Emulator"'])
651 tunnel_ips = vtep_ctl("get physical_switch %s tunnel_ips"
652 % ps_name).strip('[]"').split(", ")
653 if len(tunnel_ips) != 1 or not tunnel_ips[0]:
654 ovs.util.ovs_fatal(0, "exactly one 'tunnel_ips' should be set", vlog)
657 Tunnel_Ip = tunnel_ips[0]
659 ovs_ofctl("del-flows %s" % ps_name)
661 # Remove any logical bridges from the previous run
663 if ovs_vsctl("br-get-external-id %s vtep_logical_switch"
665 # Remove the remote side of any logical switch
666 ovs_ports = ovs_vsctl("list-ports %s" % br).split()
667 for port in ovs_ports:
668 port_type = ovs_vsctl("get Interface %s type"
670 if port_type != "patch":
673 peer = ovs_vsctl("get Interface %s options:peer"
676 ovs_vsctl("del-port %s" % peer)
678 ovs_vsctl("del-br %s" % br)
681 bfd_ports = ovs_vsctl("list-ports %s" % bfd_bridge).split()
682 for port in bfd_ports:
683 remote_ip = ovs_vsctl("get interface %s options:remote_ip"
685 destroy_vtep_tunnel(remote_ip)
687 ovs_vsctl("del-br %s" % br)
690 ovs_vsctl("add-br %s -- set Bridge %s datapath_type=%s"
691 % (bfd_bridge, bfd_bridge, ps_type))
693 ovs_vsctl("add-br %s" % bfd_bridge)
695 # Remove local-mac entries from the previous run. Otherwise, if a vlan
696 # binding is removed while the emulator is *not* running, the corresponding
697 # local-mac entries are never cleaned up.
698 vtep_ls = set(vtep_ctl("list-ls").split())
699 for ls_name in vtep_ls:
700 vtep_ctl("clear-local-macs %s" % ls_name)
704 parser = argparse.ArgumentParser()
705 parser.add_argument("ps_name", metavar="PS-NAME",
706 help="Name of physical switch.")
707 parser.add_argument("--root-prefix", metavar="DIR",
708 help="Use DIR as alternate root directory"
710 parser.add_argument("--version", action="version",
711 version="%s %s" % (ovs.util.PROGRAM_NAME, VERSION))
713 ovs.vlog.add_args(parser)
714 ovs.daemon.add_args(parser)
715 args = parser.parse_args()
716 ovs.vlog.handle_args(args)
717 ovs.daemon.handle_args(args)
721 root_prefix = args.root_prefix
724 ps_name = args.ps_name
726 ovs.daemon.daemonize()
728 ovs.unixctl.command_register("exit", "", 0, 0, unixctl_exit, None)
729 error, unixctl = ovs.unixctl.server.UnixctlServer.create(None,
732 ovs.util.ovs_fatal(error, "could not create unixctl server", vlog)
743 for ls_name, ls in six.iteritems(Lswitches):
748 poller = ovs.poller.Poller()
750 poller.timer_wait(1000)
755 if __name__ == '__main__':
759 # Let system.exit() calls complete normally
762 vlog.exception("traceback")
763 sys.exit(ovs.daemon.RESTART_EXIT_CODE)