3 from ipaddress import ip_address, ip_interface
4 from vpp_qemu_utils import (
8 delete_host_interfaces,
10 disable_interface_gso,
14 from vpp_iperf import start_iperf, stop_iperf
15 from framework import VppTestCase
16 from asfframework import VppTestRunner, tag_fixme_debian11, is_distro_debian11
17 from config import config
18 from vpp_papi import VppEnum
21 from vm_test_config import test_config
25 # - tapv2, tunv2, af_packet_v2/v3 & memif interfaces.
26 # - reads test config from the file vm_test_config.py
27 # - Uses iPerf to send TCP/IP streams to VPP
28 # - VPP ingress interface runs the iperf client
29 # - VPP egress interface runs the iperf server
30 # - Runs tests specified in the vm_test_config module and verifies that:
31 # - TCP over IPv4 and IPv6 is enabled correctly for Bridged and Routed topologies.
32 # sending jumbo frames (9000/9001 MTUs) with GSO/GRO is enabled correctly.
33 # sending VPP buffer-sized frames(2048 MTU) with GSO/GRO is enabled correctly.
34 # sending standard frames (1500 MTU) with GSO/GRO is enabled correctly.
35 # sending smaller frames (512 MTU) with GSO/GRO is enabled correctly for IPv4
36 # sending odd sized frames (9001, 2049 MTU) with GSO/GRO is enabled correctly.
41 """Selects specified test(s) from vm_test_config to run
43 The selected_test field specifies a comma separated or range(s) of
44 tests to run (default='' i.e all_tests) e.g. setting the selected_tests
45 attribute to "1,3-4,19-23" runs tests with ID's 1, 3, 4, 19, 20, 21,
46 22 & 23 from the spec file vm_test_config
49 def __init__(self, selected_tests="") -> None:
50 self.selected_tests = selected_tests
52 def filter_tests(self, test):
53 """Works with the filter fn. to include only selected tests."""
55 if self.selected_tests:
56 selection = self.selected_tests
58 selection = test_config["tests_to_run"]
60 if not selection or selection == " ":
64 for test_id in selection.split(","):
65 if "-" in test_id.strip():
66 start, end = map(int, test_id.split("-"))
67 test_ids_to_run.extend(list(range(start, end + 1)))
69 test_ids_to_run.append(int(test_id))
70 return test["id"] in test_ids_to_run
73 # Test Config variables
74 af_packet_config = test_config["af_packet"]
75 layer2 = test_config["L2"]
76 layer3 = test_config["L3"]
79 def create_test(test_name, test, ip_version, mtu):
80 """Create and return a unittest method for a test."""
83 is_distro_debian11, "FIXME intermittent test failures on debian11 distro"
86 config.skip_netns_tests, "netns not available or disabled from cli"
89 self.logger.debug(f"Starting unittest:{test_name}")
90 self.setUpTestToplogy(test=test, ip_version=ip_version)
91 result = self.set_interfaces_mtu(
93 ip_version=ip_version,
94 vpp_interfaces=self.vpp_interfaces,
95 linux_interfaces=self.linux_interfaces,
97 if "memif" in self.if_types:
98 self.logger.debug("Starting libmemif test_app for memif test")
99 self.memif_process = libmemif_test_app(
100 memif_sock_path=self.get_memif_sock_path(), logger=self.logger
103 # Start an instance of an iperf server using
104 # a unique port. Save the iperf cmdline for
105 # terminating the iperf_server process after the test.
106 self.iperf_cmd = start_iperf(
108 client_ns=self.client_namespace,
109 server_ns=self.server_namespace,
111 server_args=f"-p {self.iperf_port}",
114 # Send traffic between iperf client & server
117 ip_version=ip_version,
118 client_ns=self.client_namespace,
119 server_ns=self.server_namespace,
120 server_ipv4_address=self.server_ip4_address,
121 server_ipv6_address=self.server_ip6_address,
122 client_args=f"-p {self.iperf_port}",
129 return unittest.skip(
130 f"Skipping test:{test_name} as mtu:{mtu} is "
131 f"invalid for TCP/IPv{ip_version}"
134 test_func.__name__ = test_name
138 def generate_vpp_interface_tests(tests, test_class):
139 """Generate unittests for testing vpp interfaces
141 Generates unittests from test spec. and sets them as attributes
144 tests : list of test specs from vm_test_config['tests']
145 test_class : the name of the test class to which the
146 generated tests are set as attributes.
150 for ip_version in test_config["ip_versions"]:
151 for mtu in test_config["mtus"]:
153 f"test_id_{test['id']}_"
154 + f"client_{test['client_if_type']}"
155 + f"_v{test['client_if_version']}_"
156 + f"gso_{test.get('client_if_gso', 0)}_"
157 + f"gro_{test.get('client_if_gro', 0)}_"
158 + f"checksum_{test.get('client_if_checksum_offload', 0)}_"
159 + f"to_server_{test['server_if_type']}"
160 + f"_v{test['server_if_version']}_"
161 + f"gso_{test.get('server_if_gso', 0)}_"
162 + f"gro_{test.get('server_if_gro', 0)}_"
163 + f"checksum_{test.get('server_if_checksum_offload', 0)}_"
164 + f"mtu_{mtu}_mode_{test['x_connect_mode']}_"
165 + f"tcp_ipv{ip_version}"
167 test_func = create_test(
168 test_name=test_name, test=test, ip_version=ip_version, mtu=mtu
170 setattr(test_class, test_name, test_func)
174 class TestVPPInterfacesQemu:
175 """Test VPP interfaces inside a QEMU VM for IPv4/v6.
178 Linux_ns1--iperfClient--host-int1--vpp-af_packet-int1--VPP-BD
179 --vppaf_packet_int2--host-int2--iperfServer--Linux_ns2
182 def setUpTestToplogy(self, test, ip_version):
183 """Setup the test topology.
185 1. Create Linux Namespaces for iPerf Client & Server.
186 2. Create VPP iPerf client and server virtual interfaces.
187 3. Enable desired vif features such as GSO & GRO.
188 3. Cross-Connect interfaces in VPP using L2 or L3.
191 # Need to support multiple interface types as the memif interface
192 # in VPP is connected to the iPerf client & server by x-connecting
193 # to a tap interface in their respective namespaces.
194 client_if_types = test["client_if_type"].split(",")
195 server_if_types = test["server_if_type"].split(",")
196 client_if_version = test["client_if_version"]
197 server_if_version = test["server_if_version"]
198 x_connect_mode = test["x_connect_mode"]
199 # server ip4/ip6 addresses required by iperf client
200 server_ip4_prefix = (
201 layer2["server_ip4_prefix"]
202 if x_connect_mode == "L2"
203 else layer3["server_ip4_prefix"]
205 server_ip6_prefix = (
206 layer2["server_ip6_prefix"]
207 if x_connect_mode == "L2"
208 else layer3["server_ip6_prefix"]
210 self.server_ip4_address = str(ip_interface(server_ip4_prefix).ip)
211 self.server_ip6_address = str(ip_interface(server_ip6_prefix).ip)
212 # next-hop IP address on VPP for routing from client & server namespaces
213 vpp_client_prefix = (
214 layer3["vpp_client_ip4_prefix"]
216 else layer3["vpp_client_ip6_prefix"]
218 vpp_client_nexthop = str(ip_interface(vpp_client_prefix).ip)
219 vpp_server_prefix = (
220 layer3["vpp_server_ip4_prefix"]
222 else layer3["vpp_server_ip6_prefix"]
224 vpp_server_nexthop = str(ip_interface(vpp_server_prefix).ip)
225 # Create unique namespaces for iperf client & iperf server to
226 # prevent conflicts when TEST_JOBS > 1
227 self.client_namespace = test_config["client_namespace"] + str(test["id"])
228 self.server_namespace = test_config["server_namespace"] + str(test["id"])
229 create_namespace([self.client_namespace, self.server_namespace])
230 # Set a unique iPerf port for parallel server and client runs
231 self.iperf_port = 5000 + test["id"]
232 # IPerf client & server ingress/egress interface indexes in VPP
233 self.tap_interfaces = []
234 self.memif_interfaces = []
235 self.ingress_if_idxes = []
236 self.egress_if_idxes = []
237 self.vpp_interfaces = []
238 self.linux_interfaces = []
239 enable_client_if_gso = test.get("client_if_gso", 0)
240 enable_server_if_gso = test.get("server_if_gso", 0)
241 enable_client_if_gro = test.get("client_if_gro", 0)
242 enable_server_if_gro = test.get("server_if_gro", 0)
243 enable_client_if_checksum_offload = test.get("client_if_checksum_offload", 0)
244 enable_server_if_checksum_offload = test.get("server_if_checksum_offload", 0)
246 # Create unique host interfaces in Linux and VPP for connecting to iperf
247 # client & iperf server to prevent conflicts when TEST_JOBS > 1
248 self.iprf_client_host_interface_on_linux = af_packet_config[
249 "iprf_client_interface_on_linux"
251 self.iprf_client_host_interface_on_vpp = af_packet_config[
252 "iprf_client_interface_on_vpp"
254 self.iprf_server_host_interface_on_linux = af_packet_config[
255 "iprf_server_interface_on_linux"
257 self.iprf_server_host_interface_on_vpp = af_packet_config[
258 "iprf_server_interface_on_vpp"
260 # Handle client interface types
261 for client_if_type in client_if_types:
262 if client_if_type == "af_packet":
263 create_host_interface(
264 self.iprf_client_host_interface_on_linux,
265 self.iprf_client_host_interface_on_vpp,
266 self.client_namespace,
267 layer2["client_ip4_prefix"]
268 if x_connect_mode == "L2"
269 else layer3["client_ip4_prefix"],
270 layer2["client_ip6_prefix"]
271 if x_connect_mode == "L2"
272 else layer3["client_ip6_prefix"],
274 self.ingress_if_idx = self.create_af_packet(
275 version=client_if_version,
276 host_if_name=self.iprf_client_host_interface_on_vpp,
277 enable_gso=enable_client_if_gso,
279 self.ingress_if_idxes.append(self.ingress_if_idx)
280 self.vpp_interfaces.append(self.ingress_if_idx)
281 self.linux_interfaces.append(
282 ["", self.iprf_client_host_interface_on_vpp]
284 self.linux_interfaces.append(
286 self.client_namespace,
287 self.iprf_client_host_interface_on_linux,
290 if enable_client_if_gso == 0:
291 disable_interface_gso("", self.iprf_client_host_interface_on_vpp)
292 disable_interface_gso(
293 self.client_namespace,
294 self.iprf_client_host_interface_on_linux,
296 elif client_if_type == "tap" or client_if_type == "tun":
297 self.ingress_if_idx = self.create_tap_tun(
299 host_namespace=self.client_namespace,
300 ip_version=ip_version,
301 host_ip4_prefix=layer2["client_ip4_prefix"]
302 if x_connect_mode == "L2"
303 else layer3["client_ip4_prefix"],
304 host_ip6_prefix=layer2["client_ip6_prefix"]
305 if x_connect_mode == "L2"
306 else layer3["client_ip6_prefix"],
307 host_ip4_gw=vpp_client_nexthop
308 if x_connect_mode == "L3" and ip_version == 4
310 host_ip6_gw=vpp_client_nexthop
311 if x_connect_mode == "L3" and ip_version == 6
313 int_type=client_if_type,
314 host_if_name=f"{client_if_type}0",
315 enable_gso=enable_client_if_gso,
316 enable_gro=enable_client_if_gro,
317 enable_checksum_offload=enable_client_if_checksum_offload,
319 self.tap_interfaces.append(self.ingress_if_idx)
320 self.ingress_if_idxes.append(self.ingress_if_idx)
321 self.vpp_interfaces.append(self.ingress_if_idx)
322 self.linux_interfaces.append(
323 [self.client_namespace, f"{client_if_type}0"]
325 # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
326 disable_interface_gso(self.client_namespace, f"{client_if_type}0")
327 elif client_if_type == "memif":
328 self.ingress_if_idx = self.create_memif(
329 memif_id=0, mode=0 if x_connect_mode == "L2" else 1
331 self.memif_interfaces.append(self.ingress_if_idx)
332 self.ingress_if_idxes.append(self.ingress_if_idx)
333 self.vpp_interfaces.append(self.ingress_if_idx)
336 f"Unsupported client interface type: {client_if_type} "
337 f"for test - ID={test['id']}"
340 for server_if_type in server_if_types:
341 if server_if_type == "af_packet":
342 create_host_interface(
343 self.iprf_server_host_interface_on_linux,
344 self.iprf_server_host_interface_on_vpp,
345 self.server_namespace,
349 self.egress_if_idx = self.create_af_packet(
350 version=server_if_version,
351 host_if_name=self.iprf_server_host_interface_on_vpp,
352 enable_gso=enable_server_if_gso,
354 self.egress_if_idxes.append(self.egress_if_idx)
355 self.vpp_interfaces.append(self.egress_if_idx)
356 self.linux_interfaces.append(
357 ["", self.iprf_server_host_interface_on_vpp]
359 self.linux_interfaces.append(
361 self.server_namespace,
362 self.iprf_server_host_interface_on_linux,
365 if enable_server_if_gso == 0:
366 disable_interface_gso("", self.iprf_server_host_interface_on_vpp)
367 disable_interface_gso(
368 self.server_namespace,
369 self.iprf_server_host_interface_on_linux,
371 elif server_if_type == "tap" or server_if_type == "tun":
372 self.egress_if_idx = self.create_tap_tun(
374 host_namespace=self.server_namespace,
375 ip_version=ip_version,
376 host_ip4_prefix=layer2["server_ip4_prefix"]
377 if x_connect_mode == "L2"
378 else layer3["server_ip4_prefix"],
379 host_ip6_prefix=layer2["server_ip6_prefix"]
380 if x_connect_mode == "L2"
381 else layer3["server_ip6_prefix"],
382 int_type=server_if_type,
383 host_if_name=f"{server_if_type}0",
384 enable_gso=enable_server_if_gso,
385 enable_gro=enable_server_if_gro,
386 enable_checksum_offload=enable_server_if_checksum_offload,
388 self.tap_interfaces.append(self.egress_if_idx)
389 self.egress_if_idxes.append(self.egress_if_idx)
390 self.vpp_interfaces.append(self.egress_if_idx)
391 self.linux_interfaces.append(
392 [self.server_namespace, f"{server_if_type}0"]
394 # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
395 disable_interface_gso(self.server_namespace, f"{server_if_type}0")
396 elif server_if_type == "memif":
397 self.egress_if_idx = self.create_memif(
398 memif_id=1, mode=0 if x_connect_mode == "L2" else 1
400 self.memif_interfaces.append(self.egress_if_idx)
401 self.egress_if_idxes.append(self.egress_if_idx)
402 self.vpp_interfaces.append(self.egress_if_idx)
405 f"Unsupported server interface type: {server_if_type} "
406 f"for test - ID={test['id']}"
409 self.if_types = set(client_if_types).union(set(server_if_types))
410 # for memif testing: tapv2, memif & libmemif_app are connected
411 if "memif" not in self.if_types:
412 if x_connect_mode == "L2":
413 self.l2_connect_interfaces(1, self.ingress_if_idx, self.egress_if_idx)
414 elif x_connect_mode == "L3":
415 # L3 connect client & server side
416 vrf_id = layer3["ip4_vrf"] if ip_version == 4 else layer3["ip6_vrf"]
417 self.l3_connect_interfaces(
420 (self.ingress_if_idx, vpp_client_prefix),
421 (self.egress_if_idx, vpp_server_prefix),
423 # Setup namespace routing
426 self.client_namespace, "0.0.0.0/0", vpp_client_nexthop
429 self.server_namespace, "0.0.0.0/0", vpp_server_nexthop
433 self.client_namespace, "::/0", vpp_client_nexthop
436 self.server_namespace, "::/0", vpp_server_nexthop
439 # connect: ingress tap & memif & egress tap and memif interfaces
440 if x_connect_mode == "L2":
441 self.l2_connect_interfaces(1, *self.ingress_if_idxes)
442 self.l2_connect_interfaces(2, *self.egress_if_idxes)
443 # Wait for Linux IPv6 stack to become ready
449 for interface_if_idx in self.tap_interfaces:
450 self.vapi.tap_delete_v2(sw_if_index=interface_if_idx)
454 for interface_if_idx in self.memif_interfaces:
455 self.vapi.memif_delete(sw_if_index=interface_if_idx)
459 for interface in self.vapi.af_packet_dump():
460 if interface.host_if_name == self.iprf_client_host_interface_on_vpp:
461 self.vapi.af_packet_delete(self.iprf_client_host_interface_on_vpp)
462 elif interface.host_if_name == self.iprf_server_host_interface_on_vpp:
463 self.vapi.af_packet_delete(self.iprf_server_host_interface_on_vpp)
467 delete_host_interfaces(
468 self.iprf_client_host_interface_on_linux,
469 self.iprf_server_host_interface_on_linux,
470 self.iprf_client_host_interface_on_vpp,
471 self.iprf_server_host_interface_on_vpp,
476 self.vapi.ip_table_add_del(is_add=0, table={"table_id": layer3["ip4_vrf"]})
480 self.vapi.ip_table_add_del(is_add=0, table={"table_id": layer3["ip6_vrf"]})
484 self.vapi.bridge_domain_add_del_v2(bd_id=1, is_add=0)
485 self.vapi.bridge_domain_add_del_v2(bd_id=2, is_add=0)
491 self.client_namespace,
492 self.server_namespace,
498 if hasattr(self, "iperf_cmd"):
499 stop_iperf(" ".join(self.iperf_cmd))
503 if self.memif_process:
504 self.memif_process.terminate()
505 self.memif_process.join()
509 def create_af_packet(self, version, host_if_name, enable_gso=0):
510 """Create an af_packetv3 interface in VPP.
513 version -- 2 for af_packet_create_v2
514 -- 3 for af_packet_create_v3
515 host_if_name -- host interface name
516 enable_gso -- Enable GSO on the interface when True
518 af_packet_mode = VppEnum.vl_api_af_packet_mode_t
519 af_packet_interface_mode = af_packet_mode.AF_PACKET_API_MODE_ETHERNET
520 af_packet_flags = VppEnum.vl_api_af_packet_flags_t
521 af_packet_interface_flags = af_packet_flags.AF_PACKET_API_FLAG_QDISC_BYPASS
523 af_packet_interface_flags = (
524 af_packet_interface_flags | af_packet_flags.AF_PACKET_API_FLAG_CKSUM_GSO
527 af_packet_interface_flags = (
528 af_packet_interface_flags | af_packet_flags.AF_PACKET_API_FLAG_VERSION_2
531 "use_random_hw_addr": True,
532 "host_if_name": host_if_name,
533 "flags": af_packet_interface_flags,
535 api_args["mode"] = af_packet_interface_mode
536 result = self.vapi.af_packet_create_v3(**api_args)
537 sw_if_index = result.sw_if_index
538 # Enable software GSO chunking when interface doesn't support GSO offload
540 self.vapi.feature_gso_enable_disable(
541 sw_if_index=sw_if_index, enable_disable=1
544 self.vapi.feature_gso_enable_disable(
545 sw_if_index=sw_if_index, enable_disable=0
547 self.vapi.sw_interface_set_flags(sw_if_index=sw_if_index, flags=1)
555 host_ip4_prefix=None,
556 host_ip6_prefix=None,
563 enable_checksum_offload=0,
565 """Create a tapv2 or tunv2 interface in VPP and attach to host.
569 host_namespace -- host namespace to attach the tap/tun interface to
571 host_ip4_prefix -- ipv4 host interface address in CIDR notation
573 host_ip6_prefix -- ipv6 host interface address in CIDR notation
575 host_ip4_gw -- host IPv4 default gateway IP Address
576 host_ip6_gw -- host IPv6 default gateway IP address
577 int_type -- "tap" for tapv2 & "tun" for tunv2 interface
578 host_if_name -- host side interface name
579 enable_gso -- enable GSO
580 enable_gro -- enable GSO/GRO-Coalesce
581 enable_checksum_offload -- enable checksum offload without gso
583 TapFlags = VppEnum.vl_api_tap_flags_t
585 if int_type == "tun":
586 tap_flags = TapFlags.TAP_API_FLAG_TUN
588 tap_flags = tap_flags | (
589 TapFlags.TAP_API_FLAG_GSO | TapFlags.TAP_API_FLAG_GRO_COALESCE
592 tap_flags = tap_flags | TapFlags.TAP_API_FLAG_GSO
593 elif enable_checksum_offload:
594 tap_flags = tap_flags | TapFlags.TAP_API_FLAG_CSUM_OFFLOAD
595 elif int_type == "tap":
598 TapFlags.TAP_API_FLAG_GSO | TapFlags.TAP_API_FLAG_GRO_COALESCE
601 tap_flags = TapFlags.TAP_API_FLAG_GSO
602 elif enable_checksum_offload:
603 tap_flags = tap_flags | TapFlags.TAP_API_FLAG_CSUM_OFFLOAD
607 "host_namespace_set": True,
608 "host_namespace": host_namespace,
609 "host_if_name_set": False,
610 "host_bridge_set": False,
611 "host_mac_addr_set": False,
614 api_args["tap_flags"] = tap_flags
616 api_args["host_ip4_prefix"] = ip_interface(host_ip4_prefix)
617 api_args["host_ip4_prefix_set"] = True
619 api_args["host_ip4_gw"] = ip_address(host_ip4_gw)
620 api_args["host_ip4_gw_set"] = True
622 api_args["host_ip6_prefix"] = ip_interface(host_ip6_prefix)
623 api_args["host_ip6_prefix_set"] = True
625 api_args["host_ip6_gw"] = ip_address(host_ip6_gw)
626 api_args["host_ip6_gw_set"] = True
628 api_args["host_if_name"] = host_if_name
629 api_args["host_if_name_set"] = True
631 result = self.vapi.tap_create_v2(**api_args)
632 sw_if_index = result.sw_if_index
633 # Enable software GSO chunking when interface doesn't support GSO offload and
635 if enable_gso == 0 and enable_gro == 0:
636 self.vapi.feature_gso_enable_disable(
637 sw_if_index=sw_if_index, enable_disable=1
640 self.vapi.feature_gso_enable_disable(
641 sw_if_index=sw_if_index, enable_disable=0
644 self.vapi.sw_interface_set_flags(sw_if_index=sw_if_index, flags=1)
647 def create_memif(self, memif_id, mode):
648 """Create memif interface in VPP.
651 memif_id: A unique ID for the memif interface
652 mode: 0 = ethernet, 1 = ip, 2 = punt/inject
654 # create memif interface with role=0 (i.e. master)
655 result = self.vapi.memif_create_v2(
656 role=0, mode=mode, id=memif_id, buffer_size=9216
658 sw_if_index = result.sw_if_index
659 self.vapi.sw_interface_set_flags(sw_if_index=sw_if_index, flags=1)
662 def dump_bridge_domain_details(self, bd_id):
663 return self.vapi.bridge_domain_dump(bd_id=bd_id)
665 def l2_connect_interfaces(self, bridge_id, *sw_if_idxs):
666 for if_idx in sw_if_idxs:
667 self.vapi.sw_interface_set_l2_bridge(
668 rx_sw_if_index=if_idx, bd_id=bridge_id, shg=0, port_type=0, enable=True
671 def l3_connect_interfaces(self, ip_version, vrf_id, *if_idx_ip_prefixes):
672 """Setup routing for (if_idx, ip_prefix) inside VPP.
675 if_idx_ip_prefixes -- sequence of (if_idx, ip_prefix) tuples
679 is_ipv6 = 0 if ip_version == 4 else 1
680 self.vapi.ip_table_add_del(
681 is_add=1, table={"table_id": vrf_id, "is_ip6": is_ipv6}
683 for sw_if_index, ip_prefix in if_idx_ip_prefixes:
684 self.vapi.sw_interface_set_table(
685 sw_if_index=sw_if_index, is_ipv6=is_ipv6, vrf_id=vrf_id
687 self.vapi.sw_interface_add_del_address(
688 sw_if_index=sw_if_index, is_add=1, prefix=ip_interface(ip_prefix)
691 def set_interfaces_mtu(self, mtu, ip_version, **kwargs):
692 """Set MTUs on VPP and Linux interfaces.
697 kwargs['vpp_interfaces'] -- list of vpp interface if indexes
698 kwargs['linux_interfaces'] -- list of tuples (namespace, interface_names)
699 return True if mtu is set, else False
701 vpp_interfaces = kwargs.get("vpp_interfaces")
702 linux_interfaces = kwargs.get("linux_interfaces")
703 # IPv6 on Linux requires an MTU value >=1280
704 if (ip_version == 6 and mtu >= 1280) or ip_version == 4:
705 for sw_if_idx in vpp_interfaces:
706 self.vapi.sw_interface_set_mtu(
707 sw_if_index=sw_if_idx, mtu=[mtu, 0, 0, 0]
709 for namespace, interface_name in linux_interfaces:
712 interface=interface_name,
721 if __name__ == "__main__":
722 unittest.main(testRunner=VppTestRunner)