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-rw-r--r--yardstick/network_services/vnf_generic/vnf/base.py2
-rw-r--r--yardstick/network_services/vnf_generic/vnf/ipsec_vnf.py219
-rw-r--r--yardstick/network_services/vnf_generic/vnf/prox_helpers.py2
-rw-r--r--yardstick/network_services/vnf_generic/vnf/tg_trex_vpp.py178
-rw-r--r--yardstick/network_services/vnf_generic/vnf/vims_vnf.py105
-rw-r--r--yardstick/network_services/vnf_generic/vnf/vpp_helpers.py76
6 files changed, 580 insertions, 2 deletions
diff --git a/yardstick/network_services/vnf_generic/vnf/base.py b/yardstick/network_services/vnf_generic/vnf/base.py
index 8064ae927..8ef96b744 100644
--- a/yardstick/network_services/vnf_generic/vnf/base.py
+++ b/yardstick/network_services/vnf_generic/vnf/base.py
@@ -94,7 +94,7 @@ class VnfdHelper(dict):
for interface in self.interfaces:
virtual_intf = interface["virtual-interface"]
if virtual_intf[key] == value:
- return interface
+ return virtual_intf
raise KeyError()
def find_interface(self, **kwargs):
diff --git a/yardstick/network_services/vnf_generic/vnf/ipsec_vnf.py b/yardstick/network_services/vnf_generic/vnf/ipsec_vnf.py
new file mode 100644
index 000000000..75a8cce06
--- /dev/null
+++ b/yardstick/network_services/vnf_generic/vnf/ipsec_vnf.py
@@ -0,0 +1,219 @@
+# Copyright (c) 2019 Viosoft 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.
+
+import logging
+import re
+import time
+
+from yardstick.benchmark.contexts.base import Context
+from yardstick.common.process import check_if_process_failed
+from yardstick.network_services import constants
+from yardstick.network_services.helpers.cpu import CpuSysCores
+from yardstick.network_services.vnf_generic.vnf.sample_vnf import SampleVNF
+from yardstick.network_services.vnf_generic.vnf.vpp_helpers import \
+ VppSetupEnvHelper
+
+LOG = logging.getLogger(__name__)
+
+
+class VipsecApproxSetupEnvHelper(VppSetupEnvHelper):
+ DEFAULT_IPSEC_VNF_CFG = {
+ 'crypto_type': 'SW_cryptodev',
+ 'rxq': 1,
+ 'worker_config': '1C/1T',
+ 'worker_threads': 1,
+ }
+
+ def __init__(self, vnfd_helper, ssh_helper, scenario_helper):
+ super(VipsecApproxSetupEnvHelper, self).__init__(
+ vnfd_helper, ssh_helper, scenario_helper)
+
+ def _get_crypto_type(self):
+ vnf_cfg = self.scenario_helper.options.get('vnf_config',
+ self.DEFAULT_IPSEC_VNF_CFG)
+ return vnf_cfg.get('crypto_type', 'SW_cryptodev')
+
+ def _get_crypto_algorithms(self):
+ vpp_cfg = self.scenario_helper.all_options.get('vpp_config', {})
+ return vpp_cfg.get('crypto_algorithms', 'aes-gcm')
+
+ def _get_n_tunnels(self):
+ vpp_cfg = self.scenario_helper.all_options.get('vpp_config', {})
+ return vpp_cfg.get('tunnels', 1)
+
+ def _get_n_connections(self):
+ try:
+ flow_cfg = self.scenario_helper.all_options['flow']
+ return flow_cfg['count']
+ except KeyError:
+ raise KeyError("Missing flow definition in scenario section" +
+ " of the task definition file")
+
+ def _get_flow_src_start_ip(self):
+ node_name = self.find_encrypted_data_interface()["node_name"]
+ try:
+ flow_cfg = self.scenario_helper.all_options['flow']
+ src_ips = flow_cfg['src_ip']
+ dst_ips = flow_cfg['dst_ip']
+ except KeyError:
+ raise KeyError("Missing flow definition in scenario section" +
+ " of the task definition file")
+
+ for src, dst in zip(src_ips, dst_ips):
+ flow_src_start_ip, _ = src.split('-')
+ flow_dst_start_ip, _ = dst.split('-')
+
+ if node_name == "vnf__0":
+ return flow_src_start_ip
+ elif node_name == "vnf__1":
+ return flow_dst_start_ip
+
+ def _get_flow_dst_start_ip(self):
+ node_name = self.find_encrypted_data_interface()["node_name"]
+ try:
+ flow_cfg = self.scenario_helper.all_options['flow']
+ src_ips = flow_cfg['src_ip']
+ dst_ips = flow_cfg['dst_ip']
+ except KeyError:
+ raise KeyError("Missing flow definition in scenario section" +
+ " of the task definition file")
+
+ for src, dst in zip(src_ips, dst_ips):
+ flow_src_start_ip, _ = src.split('-')
+ flow_dst_start_ip, _ = dst.split('-')
+
+ if node_name == "vnf__0":
+ return flow_dst_start_ip
+ elif node_name == "vnf__1":
+ return flow_src_start_ip
+
+ def build_config(self):
+ # TODO Implement later
+ pass
+
+ def setup_vnf_environment(self):
+ resource = super(VipsecApproxSetupEnvHelper,
+ self).setup_vnf_environment()
+
+ self.start_vpp_service()
+
+ sys_cores = CpuSysCores(self.ssh_helper)
+ self._update_vnfd_helper(sys_cores.get_cpu_layout())
+
+ return resource
+
+ @staticmethod
+ def calculate_frame_size(frame_cfg):
+ if not frame_cfg:
+ return 64
+
+ imix_count = {size.upper().replace('B', ''): int(weight)
+ for size, weight in frame_cfg.items()}
+ imix_sum = sum(imix_count.values())
+ if imix_sum <= 0:
+ return 64
+ packets_total = sum([int(size) * weight
+ for size, weight in imix_count.items()])
+ return packets_total / imix_sum
+
+ def check_status(self):
+ ipsec_created = False
+ cmd = "vppctl show int"
+ _, stdout, _ = self.ssh_helper.execute(cmd)
+ entries = re.split(r"\n+", stdout)
+ tmp = [re.split(r"\s\s+", entry, 5) for entry in entries]
+
+ for item in tmp:
+ if isinstance(item, list):
+ if item[0] and item[0] != 'local0':
+ if "ipsec" in item[0] and not ipsec_created:
+ ipsec_created = True
+ if len(item) > 2 and item[2] == 'down':
+ return False
+ return ipsec_created
+
+ def get_vpp_statistics(self):
+ # TODO Implement later
+ return None
+
+ def create_ipsec_tunnels(self):
+ # TODO Implement later
+ pass
+
+ def find_raw_data_interface(self):
+ try:
+ return self.vnfd_helper.find_virtual_interface(vld_id="uplink_0")
+ except KeyError:
+ return self.vnfd_helper.find_virtual_interface(vld_id="downlink_0")
+
+ def find_encrypted_data_interface(self):
+ return self.vnfd_helper.find_virtual_interface(vld_id="ciphertext")
+
+
+class VipsecApproxVnf(SampleVNF):
+ """ This class handles vIPSEC VNF model-driver definitions """
+
+ APP_NAME = 'vIPSEC'
+ APP_WORD = 'vipsec'
+ WAIT_TIME = 20
+
+ def __init__(self, name, vnfd, setup_env_helper_type=None,
+ resource_helper_type=None):
+ if setup_env_helper_type is None:
+ setup_env_helper_type = VipsecApproxSetupEnvHelper
+ super(VipsecApproxVnf, self).__init__(
+ name, vnfd, setup_env_helper_type,
+ resource_helper_type)
+
+ def _run(self):
+ # we can't share ssh paramiko objects to force new connection
+ self.ssh_helper.drop_connection()
+ # kill before starting
+ self.setup_helper.kill_vnf()
+ self._build_config()
+ self.setup_helper.create_ipsec_tunnels()
+
+ def wait_for_instantiate(self):
+ time.sleep(self.WAIT_TIME)
+ while True:
+ status = self.setup_helper.check_status()
+ if not self._vnf_process.is_alive() and not status:
+ raise RuntimeError("%s VNF process died." % self.APP_NAME)
+ LOG.info("Waiting for %s VNF to start.. ", self.APP_NAME)
+ time.sleep(self.WAIT_TIME_FOR_SCRIPT)
+ status = self.setup_helper.check_status()
+ if status:
+ LOG.info("%s VNF is up and running.", self.APP_NAME)
+ self._vnf_up_post()
+ return self._vnf_process.exitcode
+
+ def terminate(self):
+ self.setup_helper.kill_vnf()
+ self._tear_down()
+ self.resource_helper.stop_collect()
+ if self._vnf_process is not None:
+ # be proper and join first before we kill
+ LOG.debug("joining before terminate %s", self._vnf_process.name)
+ self._vnf_process.join(constants.PROCESS_JOIN_TIMEOUT)
+ self._vnf_process.terminate()
+
+ def collect_kpi(self):
+ # we can't get KPIs if the VNF is down
+ check_if_process_failed(self._vnf_process, 0.01)
+ physical_node = Context.get_physical_node_from_server(
+ self.scenario_helper.nodes[self.name])
+ result = {"physical_node": physical_node}
+ result["collect_stats"] = self.setup_helper.get_vpp_statistics()
+ LOG.debug("%s collect KPIs %s", self.APP_NAME, result)
+ return result
diff --git a/yardstick/network_services/vnf_generic/vnf/prox_helpers.py b/yardstick/network_services/vnf_generic/vnf/prox_helpers.py
index a3d0c19cd..3507315f2 100644
--- a/yardstick/network_services/vnf_generic/vnf/prox_helpers.py
+++ b/yardstick/network_services/vnf_generic/vnf/prox_helpers.py
@@ -347,7 +347,7 @@ class ProxSocketHelper(object):
LOG.debug("Received data from socket: [%s]", ret_str)
return status, ret_str
- def get_data(self, pkt_dump_only=False, timeout=0.01):
+ def get_data(self, pkt_dump_only=False, timeout=10.0):
""" read data from the socket """
# This method behaves slightly differently depending on whether it is
diff --git a/yardstick/network_services/vnf_generic/vnf/tg_trex_vpp.py b/yardstick/network_services/vnf_generic/vnf/tg_trex_vpp.py
new file mode 100644
index 000000000..846304880
--- /dev/null
+++ b/yardstick/network_services/vnf_generic/vnf/tg_trex_vpp.py
@@ -0,0 +1,178 @@
+# Copyright (c) 2019 Viosoft 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.
+
+import logging
+
+from trex_stl_lib.trex_stl_exceptions import STLError
+
+from yardstick.common.utils import safe_cast
+from yardstick.network_services.vnf_generic.vnf.sample_vnf import \
+ Rfc2544ResourceHelper
+from yardstick.network_services.vnf_generic.vnf.sample_vnf import \
+ SampleVNFTrafficGen
+from yardstick.network_services.vnf_generic.vnf.tg_trex import \
+ TrexDpdkVnfSetupEnvHelper
+from yardstick.network_services.vnf_generic.vnf.tg_trex import \
+ TrexResourceHelper
+
+LOGGING = logging.getLogger(__name__)
+
+
+class TrexVppResourceHelper(TrexResourceHelper):
+
+ def __init__(self, setup_helper, rfc_helper_type=None):
+ super(TrexVppResourceHelper, self).__init__(setup_helper)
+
+ if rfc_helper_type is None:
+ rfc_helper_type = Rfc2544ResourceHelper
+
+ self.rfc2544_helper = rfc_helper_type(self.scenario_helper)
+
+ self.loss = None
+ self.sent = None
+ self.latency = None
+
+ def generate_samples(self, stats=None, ports=None, port_pg_id=None,
+ latency=False):
+ samples = {}
+ if stats is None:
+ stats = self.get_stats(ports)
+ for pname in (intf['name'] for intf in self.vnfd_helper.interfaces):
+ port_num = self.vnfd_helper.port_num(pname)
+ port_stats = stats.get(port_num, {})
+ samples[pname] = {
+ 'rx_throughput_fps': float(port_stats.get('rx_pps', 0.0)),
+ 'tx_throughput_fps': float(port_stats.get('tx_pps', 0.0)),
+ 'rx_throughput_bps': float(port_stats.get('rx_bps', 0.0)),
+ 'tx_throughput_bps': float(port_stats.get('tx_bps', 0.0)),
+ 'in_packets': int(port_stats.get('ipackets', 0)),
+ 'out_packets': int(port_stats.get('opackets', 0)),
+ }
+
+ if latency:
+ pg_id_list = port_pg_id.get_pg_ids(port_num)
+ samples[pname]['latency'] = {}
+ for pg_id in pg_id_list:
+ latency_global = stats.get('latency', {})
+ pg_latency = latency_global.get(pg_id, {}).get('latency')
+
+ t_min = safe_cast(pg_latency.get("total_min", 0.0), float,
+ -1.0)
+ t_avg = safe_cast(pg_latency.get("average", 0.0), float,
+ -1.0)
+ t_max = safe_cast(pg_latency.get("total_max", 0.0), float,
+ -1.0)
+
+ latency = {
+ "min_latency": t_min,
+ "max_latency": t_max,
+ "avg_latency": t_avg,
+ }
+ samples[pname]['latency'][pg_id] = latency
+
+ return samples
+
+ def _run_traffic_once(self, traffic_profile):
+ self.client_started.value = 1
+ traffic_profile.execute_traffic(self)
+ return True
+
+ def run_traffic(self, traffic_profile):
+ self._queue.cancel_join_thread()
+ traffic_profile.init_queue(self._queue)
+ super(TrexVppResourceHelper, self).run_traffic(traffic_profile)
+
+ @staticmethod
+ def fmt_latency(lat_min, lat_avg, lat_max):
+ t_min = int(round(safe_cast(lat_min, float, -1.0)))
+ t_avg = int(round(safe_cast(lat_avg, float, -1.0)))
+ t_max = int(round(safe_cast(lat_max, float, -1.0)))
+
+ return "/".join(str(tmp) for tmp in (t_min, t_avg, t_max))
+
+ def send_traffic_on_tg(self, ports, port_pg_id, duration, rate,
+ latency=False):
+ try:
+ # Choose rate and start traffic:
+ self.client.start(ports=ports, mult=rate, duration=duration)
+ # Block until done:
+ try:
+ self.client.wait_on_traffic(ports=ports, timeout=duration + 20)
+ except STLError as err:
+ self.client.stop(ports)
+ LOGGING.error("TRex stateless timeout error: %s", err)
+
+ if self.client.get_warnings():
+ for warning in self.client.get_warnings():
+ LOGGING.warning(warning)
+
+ # Read the stats after the test
+ stats = self.client.get_stats()
+
+ packets_in = []
+ packets_out = []
+ for port in ports:
+ packets_in.append(stats[port]["ipackets"])
+ packets_out.append(stats[port]["opackets"])
+
+ if latency:
+ self.latency = []
+ pg_id_list = port_pg_id.get_pg_ids(port)
+ for pg_id in pg_id_list:
+ latency_global = stats.get('latency', {})
+ pg_latency = latency_global.get(pg_id, {}).get(
+ 'latency')
+ lat = self.fmt_latency(
+ str(pg_latency.get("total_min")),
+ str(pg_latency.get("average")),
+ str(pg_latency.get("total_max")))
+ LOGGING.info(
+ "latencyStream%s(usec)=%s", pg_id, lat)
+ self.latency.append(lat)
+
+ self.sent = sum(packets_out)
+ total_rcvd = sum(packets_in)
+ self.loss = self.sent - total_rcvd
+ LOGGING.info("rate=%s, totalReceived=%s, totalSent=%s,"
+ " frameLoss=%s", rate, total_rcvd, self.sent,
+ self.loss)
+ return stats
+ except STLError as err:
+ LOGGING.error("TRex stateless runtime error: %s", err)
+ raise RuntimeError('TRex stateless runtime error')
+
+
+class TrexTrafficGenVpp(SampleVNFTrafficGen):
+ APP_NAME = 'TRex'
+ WAIT_TIME = 20
+
+ def __init__(self, name, vnfd, setup_env_helper_type=None,
+ resource_helper_type=None):
+ if setup_env_helper_type is None:
+ setup_env_helper_type = TrexDpdkVnfSetupEnvHelper
+ if resource_helper_type is None:
+ resource_helper_type = TrexVppResourceHelper
+
+ super(TrexTrafficGenVpp, self).__init__(
+ name, vnfd, setup_env_helper_type, resource_helper_type)
+
+ def _check_status(self):
+ return self.resource_helper.check_status()
+
+ def _start_server(self):
+ super(TrexTrafficGenVpp, self)._start_server()
+ self.resource_helper.start()
+
+ def wait_for_instantiate(self):
+ return self._wait_for_process()
diff --git a/yardstick/network_services/vnf_generic/vnf/vims_vnf.py b/yardstick/network_services/vnf_generic/vnf/vims_vnf.py
new file mode 100644
index 000000000..0e339b171
--- /dev/null
+++ b/yardstick/network_services/vnf_generic/vnf/vims_vnf.py
@@ -0,0 +1,105 @@
+# Copyright (c) 2019 Viosoft 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.
+
+import logging
+import time
+
+from yardstick.network_services.vnf_generic.vnf import sample_vnf
+
+LOG = logging.getLogger(__name__)
+
+
+class VimsSetupEnvHelper(sample_vnf.SetupEnvHelper):
+
+ def setup_vnf_environment(self):
+ LOG.debug('VimsSetupEnvHelper:\n')
+
+
+class VimsResourceHelper(sample_vnf.ClientResourceHelper):
+ pass
+
+
+class VimsPcscfVnf(sample_vnf.SampleVNF):
+
+ APP_NAME = "VimsPcscf"
+ APP_WORD = "VimsPcscf"
+
+ def __init__(self, name, vnfd, setup_env_helper_type=None,
+ resource_helper_type=None):
+ if resource_helper_type is None:
+ resource_helper_type = VimsResourceHelper
+ if setup_env_helper_type is None:
+ setup_env_helper_type = VimsSetupEnvHelper
+ super(VimsPcscfVnf, self).__init__(name, vnfd, setup_env_helper_type,
+ resource_helper_type)
+
+ def wait_for_instantiate(self):
+ pass
+
+ def _run(self):
+ pass
+
+ def start_collect(self):
+ # TODO
+ pass
+
+ def collect_kpi(self):
+ # TODO
+ pass
+
+
+class VimsHssVnf(sample_vnf.SampleVNF):
+
+ APP_NAME = "VimsHss"
+ APP_WORD = "VimsHss"
+ CMD = "sudo /media/generate_user.sh {} {} >> /dev/null 2>&1"
+
+ def __init__(self, name, vnfd, setup_env_helper_type=None,
+ resource_helper_type=None):
+ if resource_helper_type is None:
+ resource_helper_type = VimsResourceHelper
+ if setup_env_helper_type is None:
+ setup_env_helper_type = VimsSetupEnvHelper
+ super(VimsHssVnf, self).__init__(name, vnfd, setup_env_helper_type,
+ resource_helper_type)
+ self.start_user = 1
+ self.end_user = 10000
+ self.WAIT_TIME = 600
+
+ def instantiate(self, scenario_cfg, context_cfg):
+ LOG.debug("scenario_cfg=%s\n", scenario_cfg)
+ self.start_user = scenario_cfg.get("options", {}).get("start_user", self.start_user)
+ self.end_user = scenario_cfg.get("options", {}).get("end_user", self.end_user)
+ # TODO
+ # Need to check HSS services are ready before generating user accounts
+ # Now, adding time sleep that manually configured by user
+ # to wait for HSS services.
+ # Note: for heat, waiting time is too long (~ 600s)
+ self.WAIT_TIME = scenario_cfg.get("options", {}).get("wait_time", self.WAIT_TIME)
+ time.sleep(self.WAIT_TIME)
+ LOG.debug("Generate user accounts from %d to %d\n",
+ self.start_user, self.end_user)
+ cmd = self.CMD.format(self.start_user, self.end_user)
+ self.ssh_helper.execute(cmd, None, 3600, False)
+
+ def wait_for_instantiate(self):
+ pass
+
+ def start_collect(self):
+ # TODO
+ pass
+
+ def collect_kpi(self):
+ # TODO
+ pass
diff --git a/yardstick/network_services/vnf_generic/vnf/vpp_helpers.py b/yardstick/network_services/vnf_generic/vnf/vpp_helpers.py
new file mode 100644
index 000000000..86c42ecfd
--- /dev/null
+++ b/yardstick/network_services/vnf_generic/vnf/vpp_helpers.py
@@ -0,0 +1,76 @@
+# Copyright (c) 2019 Viosoft 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.
+
+import logging
+
+from yardstick.network_services.vnf_generic.vnf.sample_vnf import \
+ DpdkVnfSetupEnvHelper
+
+LOG = logging.getLogger(__name__)
+
+
+class VppSetupEnvHelper(DpdkVnfSetupEnvHelper):
+ APP_NAME = "vpp"
+ CFG_CONFIG = "/etc/vpp/startup.conf"
+ CFG_SCRIPT = ""
+ PIPELINE_COMMAND = ""
+ VNF_TYPE = "IPSEC"
+ VAT_BIN_NAME = 'vpp_api_test'
+
+ def __init__(self, vnfd_helper, ssh_helper, scenario_helper):
+ super(VppSetupEnvHelper, self).__init__(vnfd_helper, ssh_helper,
+ scenario_helper)
+
+ def kill_vnf(self):
+ ret_code, _, _ = \
+ self.ssh_helper.execute(
+ 'service {name} stop'.format(name=self.APP_NAME))
+ if int(ret_code):
+ raise RuntimeError(
+ 'Failed to stop service {name}'.format(name=self.APP_NAME))
+
+ def tear_down(self):
+ pass
+
+ def start_vpp_service(self):
+ ret_code, _, _ = \
+ self.ssh_helper.execute(
+ 'service {name} restart'.format(name=self.APP_NAME))
+ if int(ret_code):
+ raise RuntimeError(
+ 'Failed to start service {name}'.format(name=self.APP_NAME))
+
+ def _update_vnfd_helper(self, additional_data, iface_key=None):
+ for k, v in additional_data.items():
+ if iface_key is None:
+ if isinstance(v, dict) and k in self.vnfd_helper:
+ self.vnfd_helper[k].update(v)
+ else:
+ self.vnfd_helper[k] = v
+ else:
+ if isinstance(v,
+ dict) and k in self.vnfd_helper.find_virtual_interface(
+ ifname=iface_key):
+ self.vnfd_helper.find_virtual_interface(ifname=iface_key)[
+ k].update(v)
+ else:
+ self.vnfd_helper.find_virtual_interface(ifname=iface_key)[
+ k] = v
+
+ def get_value_by_interface_key(self, interface, key):
+ try:
+ return self.vnfd_helper.find_virtual_interface(
+ ifname=interface).get(key)
+ except (KeyError, ValueError):
+ return None