test/test_vm_vpp_interfaces.py

   1 #!/usr/bin/env python3
   2 import unittest
   3 from ipaddress import ip_address, ip_interface
   4 from vpp_qemu_utils import (
   5     create_namespace,
   6     delete_namespace,
   7     create_host_interface,
   8     delete_host_interfaces,
   9     set_interface_mtu,
  10     disable_interface_gso,
  11     add_namespace_route,
  12 )
  13 from vpp_iperf import start_iperf, stop_iperf
  14 from framework import VppTestCase, VppTestRunner
  15 from config import config
  16 from vpp_papi import VppEnum
  17 import time
  18 import sys
  19 from vm_test_config import test_config
  20
  21 #
  22 # Tests for:
  23 # - tapv2, tunv2 & af_packet_v2 & v3 interfaces.
  24 # - reads test config from the file vm_test_config.py
  25 # - Uses iPerf to send TCP/IP streams to VPP
  26 #   - VPP ingress interface runs the iperf client
  27 #   - VPP egress interface runs the iperf server
  28 # - Runs tests specified in the vm_test_config module and verifies that:
  29 #   - TCP over IPv4 and IPv6 is enabled correctly for Bridged and Routed topologies.
  30 #     sending jumbo frames (9000/9001 MTUs) with GSO/GRO is enabled correctly.
  31 #     sending VPP buffer-sized frames(2048 MTU) with GSO/GRO is enabled correctly.
  32 #     sending standard frames (1500 MTU) with GSO/GRO is enabled correctly.
  33 #     sending smaller frames (512 MTU) with GSO/GRO is enabled correctly for IPv4
  34 #     sending odd sized frames (9001, 2049 MTU) with GSO/GRO is enabled correctly.
  35 #
  36
  37
  38 def filter_tests(test):
  39     """Filter test IDs to include only those selected to run."""
  40     selection = test_config["tests_to_run"]
  41     if not selection or selection == " ":
  42         return True
  43     else:
  44         test_ids_to_run = []
  45         for test_id in selection.split(","):
  46             if "-" in test_id.strip():
  47                 start, end = map(int, test_id.split("-"))
  48                 test_ids_to_run.extend(list(range(start, end + 1)))
  49             elif test_id.strip():
  50                 test_ids_to_run.append(int(test_id))
  51         return test["id"] in test_ids_to_run
  52
  53
  54 # Test Config variables
  55 client_namespace = test_config["client_namespace"]
  56 server_namespace = test_config["server_namespace"]
  57 tests = filter(filter_tests, test_config["tests"])
  58 af_packet_config = test_config["af_packet"]
  59 layer2 = test_config["L2"]
  60 layer3 = test_config["L3"]
  61
  62
  63 def create_test(test_name, test, ip_version, mtu):
  64     """Create and return a unittest method for a test."""
  65
  66     @unittest.skipIf(
  67         config.skip_netns_tests, "netns not available or disabled from cli"
  68     )
  69     def test_func(self):
  70         self.logger.debug(f"Starting unittest:{test_name}")
  71         self.setUpTestToplogy(test=test, ip_version=ip_version)
  72         result = self.set_interfaces_mtu(
  73             mtu=mtu,
  74             ip_version=ip_version,
  75             vpp_interfaces=self.vpp_interfaces,
  76             linux_interfaces=self.linux_interfaces,
  77         )
  78         # Start the Iperf server in dual stack mode & run iperf client
  79         if result is True:
  80             start_iperf(ip_version=6, server_only=True, logger=self.logger)
  81             self.assertTrue(
  82                 start_iperf(
  83                     ip_version=ip_version,
  84                     server_ipv4_address=self.server_ip4_address,
  85                     server_ipv6_address=self.server_ip6_address,
  86                     client_only=True,
  87                     duration=2,
  88                     logger=self.logger,
  89                 )
  90             )
  91         else:
  92             print(
  93                 f"Skipping test:{test_name} as mtu:{mtu} is "
  94                 f"invalid for TCP/IPv{ip_version}"
  95             )
  96
  97     test_func.__name__ = test_name
  98     return test_func
  99
 100
 101 def generate_vpp_interface_tests():
 102     """Generate unittests for testing vpp interfaces."""
 103     if config.skip_netns_tests:
 104         print("Skipping netns tests")
 105     for test in tests:
 106         for ip_version in test_config["ip_versions"]:
 107             for mtu in test_config["mtus"]:
 108                 test_name = (
 109                     f"test_id_{test['id']}_"
 110                     + f"client_{test['client_if_type']}"
 111                     + f"_v{test['client_if_version']}_"
 112                     + f"gso_{test.get('client_if_gso', 0)}_"
 113                     + f"gro_{test.get('client_if_gro', 0)}_"
 114                     + f"to_server_{test['server_if_type']}"
 115                     + f"_v{test['server_if_version']}_"
 116                     + f"gso_{test.get('server_if_gso', 0)}_"
 117                     + f"gro_{test.get('server_if_gro', 0)}_"
 118                     + f"mtu_{mtu}_mode_{test['x_connect_mode']}_"
 119                     + f"tcp_ipv{ip_version}"
 120                 )
 121                 test_func = create_test(
 122                     test_name=test_name, test=test, ip_version=ip_version, mtu=mtu
 123                 )
 124                 setattr(TestVPPInterfacesQemu, test_name, test_func)
 125
 126
 127 class TestVPPInterfacesQemu(VppTestCase):
 128     """Test VPP interfaces inside a QEMU VM for IPv4/v6.
 129
 130     Test Setup:
 131     Linux_ns1--iperfClient--host-int1--vpp-af_packet-int1--VPP-BD
 132              --vppaf_packet_int2--host-int2--iperfServer--Linux_ns2
 133     """
 134
 135     @classmethod
 136     def setUpClass(cls):
 137         super(TestVPPInterfacesQemu, cls).setUpClass()
 138
 139     @classmethod
 140     def tearDownClass(cls):
 141         super(TestVPPInterfacesQemu, cls).tearDownClass()
 142
 143     def setUpTestToplogy(self, test, ip_version):
 144         """Setup the test topology.
 145
 146         1. Create Linux Namespaces for iPerf Client & Server.
 147         2. Create VPP iPerf client and server virtual interfaces.
 148         3. Enable desired vif features such as GSO & GRO.
 149         3. Cross-Connect interfaces in VPP using L2 or L3.
 150         """
 151         super(TestVPPInterfacesQemu, self).setUp()
 152         client_if_type = test["client_if_type"]
 153         server_if_type = test["server_if_type"]
 154         client_if_version = test["client_if_version"]
 155         server_if_version = test["server_if_version"]
 156         x_connect_mode = test["x_connect_mode"]
 157         # server ip4/ip6 addresses required by iperf client
 158         server_ip4_prefix = (
 159             layer2["server_ip4_prefix"]
 160             if x_connect_mode == "L2"
 161             else layer3["server_ip4_prefix"]
 162         )
 163         server_ip6_prefix = (
 164             layer2["server_ip6_prefix"]
 165             if x_connect_mode == "L2"
 166             else layer3["server_ip6_prefix"]
 167         )
 168         self.server_ip4_address = str(ip_interface(server_ip4_prefix).ip)
 169         self.server_ip6_address = str(ip_interface(server_ip6_prefix).ip)
 170         # next-hop IP address on VPP for routing from client & server namespaces
 171         vpp_client_prefix = (
 172             layer3["vpp_client_ip4_prefix"]
 173             if ip_version == 4
 174             else layer3["vpp_client_ip6_prefix"]
 175         )
 176         vpp_client_nexthop = str(ip_interface(vpp_client_prefix).ip)
 177         vpp_server_prefix = (
 178             layer3["vpp_server_ip4_prefix"]
 179             if ip_version == 4
 180             else layer3["vpp_server_ip6_prefix"]
 181         )
 182         vpp_server_nexthop = str(ip_interface(vpp_server_prefix).ip)
 183         create_namespace([client_namespace, server_namespace])
 184         self.vpp_interfaces = []
 185         self.linux_interfaces = []
 186         enable_client_if_gso = test.get("client_if_gso", 0)
 187         enable_server_if_gso = test.get("server_if_gso", 0)
 188         enable_client_if_gro = test.get("client_if_gro", 0)
 189         enable_server_if_gro = test.get("server_if_gro", 0)
 190         ## Handle client interface types
 191         if client_if_type == "af_packet":
 192             create_host_interface(
 193                 af_packet_config["iprf_client_interface_on_linux"],
 194                 af_packet_config["iprf_client_interface_on_vpp"],
 195                 client_namespace,
 196                 layer2["client_ip4_prefix"]
 197                 if x_connect_mode == "L2"
 198                 else layer3["client_ip4_prefix"],
 199                 layer2["client_ip6_prefix"]
 200                 if x_connect_mode == "L2"
 201                 else layer3["client_ip6_prefix"],
 202             )
 203             self.ingress_if_idx = self.create_af_packet(
 204                 version=client_if_version,
 205                 host_if_name=af_packet_config["iprf_client_interface_on_vpp"],
 206                 enable_gso=enable_client_if_gso,
 207             )
 208             self.vpp_interfaces.append(self.ingress_if_idx)
 209             self.linux_interfaces.append(
 210                 ["", af_packet_config["iprf_client_interface_on_vpp"]]
 211             )
 212             self.linux_interfaces.append(
 213                 [client_namespace, af_packet_config["iprf_client_interface_on_linux"]]
 214             )
 215             if enable_client_if_gso == 0:
 216                 disable_interface_gso(
 217                     "", af_packet_config["iprf_client_interface_on_vpp"]
 218                 )
 219                 disable_interface_gso(
 220                     client_namespace, af_packet_config["iprf_client_interface_on_linux"]
 221                 )
 222         elif client_if_type == "tap" or client_if_type == "tun":
 223             self.ingress_if_idx = self.create_tap_tun(
 224                 id=101,
 225                 host_namespace=client_namespace,
 226                 ip_version=ip_version,
 227                 host_ip4_prefix=layer2["client_ip4_prefix"]
 228                 if x_connect_mode == "L2"
 229                 else layer3["client_ip4_prefix"],
 230                 host_ip6_prefix=layer2["client_ip6_prefix"]
 231                 if x_connect_mode == "L2"
 232                 else layer3["client_ip6_prefix"],
 233                 host_ip4_gw=vpp_client_nexthop
 234                 if x_connect_mode == "L3" and ip_version == 4
 235                 else None,
 236                 host_ip6_gw=vpp_client_nexthop
 237                 if x_connect_mode == "L3" and ip_version == 6
 238                 else None,
 239                 int_type=client_if_type,
 240                 host_if_name=f"{client_if_type}0",
 241                 enable_gso=enable_client_if_gso,
 242                 enable_gro=enable_client_if_gro,
 243             )
 244             self.vpp_interfaces.append(self.ingress_if_idx)
 245             self.linux_interfaces.append([client_namespace, f"{client_if_type}0"])
 246             # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
 247             disable_interface_gso(client_namespace, f"{client_if_type}0")
 248         else:
 249             print(
 250                 f"Unsupported client interface type: {client_if_type} "
 251                 f"for test - ID={test['id']}"
 252             )
 253             sys.exit(1)
 254
 255         if server_if_type == "af_packet":
 256             create_host_interface(
 257                 af_packet_config["iprf_server_interface_on_linux"],
 258                 af_packet_config["iprf_server_interface_on_vpp"],
 259                 server_namespace,
 260                 server_ip4_prefix,
 261                 server_ip6_prefix,
 262             )
 263             self.egress_if_idx = self.create_af_packet(
 264                 version=server_if_version,
 265                 host_if_name=af_packet_config["iprf_server_interface_on_vpp"],
 266                 enable_gso=enable_server_if_gso,
 267             )
 268             self.vpp_interfaces.append(self.egress_if_idx)
 269             self.linux_interfaces.append(
 270                 ["", af_packet_config["iprf_server_interface_on_vpp"]]
 271             )
 272             self.linux_interfaces.append(
 273                 [server_namespace, af_packet_config["iprf_server_interface_on_linux"]]
 274             )
 275             if enable_server_if_gso == 0:
 276                 disable_interface_gso(
 277                     "", af_packet_config["iprf_server_interface_on_vpp"]
 278                 )
 279                 disable_interface_gso(
 280                     server_namespace, af_packet_config["iprf_server_interface_on_linux"]
 281                 )
 282         elif server_if_type == "tap" or server_if_type == "tun":
 283             self.egress_if_idx = self.create_tap_tun(
 284                 id=102,
 285                 host_namespace=server_namespace,
 286                 ip_version=ip_version,
 287                 host_ip4_prefix=layer2["server_ip4_prefix"]
 288                 if x_connect_mode == "L2"
 289                 else layer3["server_ip4_prefix"],
 290                 host_ip6_prefix=layer2["server_ip6_prefix"]
 291                 if x_connect_mode == "L2"
 292                 else layer3["server_ip6_prefix"],
 293                 int_type=server_if_type,
 294                 host_if_name=f"{server_if_type}0",
 295                 enable_gso=enable_server_if_gso,
 296                 enable_gro=enable_server_if_gro,
 297             )
 298             self.vpp_interfaces.append(self.egress_if_idx)
 299             self.linux_interfaces.append([server_namespace, f"{server_if_type}0"])
 300             # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
 301             disable_interface_gso(server_namespace, f"{server_if_type}0")
 302         else:
 303             print(
 304                 f"Unsupported server interface type: {server_if_type} "
 305                 f"for test - ID={test['id']}"
 306             )
 307             sys.exit(1)
 308
 309         if x_connect_mode == "L2":
 310             self.l2_connect_interfaces(1, self.ingress_if_idx, self.egress_if_idx)
 311         elif x_connect_mode == "L3":
 312             # L3 connect client & server side
 313             vrf_id = layer3["ip4_vrf"] if ip_version == 4 else layer3["ip6_vrf"]
 314             self.l3_connect_interfaces(
 315                 ip_version,
 316                 vrf_id,
 317                 (self.ingress_if_idx, vpp_client_prefix),
 318                 (self.egress_if_idx, vpp_server_prefix),
 319             )
 320             # Setup namespace routing
 321             if ip_version == 4:
 322                 add_namespace_route(client_namespace, "0.0.0.0/0", vpp_client_nexthop)
 323                 add_namespace_route(server_namespace, "0.0.0.0/0", vpp_server_nexthop)
 324             else:
 325                 add_namespace_route(client_namespace, "::/0", vpp_client_nexthop)
 326                 add_namespace_route(server_namespace, "::/0", vpp_server_nexthop)
 327         # Wait for Linux IPv6 stack to become ready
 328         if ip_version == 6:
 329             time.sleep(2)
 330
 331     def tearDown(self):
 332         try:
 333             self.vapi.tap_delete_v2(self.ingress_if_idx)
 334         except Exception:
 335             pass
 336         try:
 337             self.vapi.tap_delete_v2(self.egress_if_idx)
 338         except Exception:
 339             pass
 340         try:
 341             for interface in self.vapi.af_packet_dump():
 342                 if (
 343                     interface.host_if_name
 344                     == af_packet_config["iprf_client_interface_on_vpp"]
 345                 ):
 346                     self.vapi.af_packet_delete(
 347                         af_packet_config["iprf_client_interface_on_vpp"]
 348                     )
 349                 elif (
 350                     interface.host_if_name
 351                     == af_packet_config["iprf_server_interface_on_vpp"]
 352                 ):
 353                     self.vapi.af_packet_delete(
 354                         af_packet_config["iprf_server_interface_on_vpp"]
 355                     )
 356         except Exception:
 357             pass
 358         try:
 359             delete_host_interfaces(
 360                 af_packet_config["iprf_client_interface_on_linux"],
 361                 af_packet_config["iprf_server_interface_on_linux"],
 362                 af_packet_config["iprf_client_interface_on_vpp"],
 363                 af_packet_config["iprf_server_interface_on_vpp"],
 364             )
 365         except Exception:
 366             pass
 367         try:
 368             self.vapi.ip_table_add_del(is_add=0, table={"table_id": layer3["ip4_vrf"]})
 369         except Exception:
 370             pass
 371         try:
 372             self.vapi.ip_table_add_del(is_add=0, table={"table_id": layer3["ip6_vrf"]})
 373         except Exception:
 374             pass
 375         try:
 376             delete_namespace(
 377                 [
 378                     client_namespace,
 379                     server_namespace,
 380                 ]
 381             )
 382         except Exception:
 383             pass
 384         try:
 385             stop_iperf()
 386         except Exception:
 387             pass
 388
 389     def create_af_packet(self, version, host_if_name, enable_gso=0):
 390         """Create an af_packetv3 interface in VPP.
 391
 392         Parameters:
 393         version -- 2 for af_packet_create_v2
 394                 -- 3 for af_packet_create_v3
 395         host_if_name -- host interface name
 396         enable_gso -- Enable GSO on the interface when True
 397         """
 398         af_packet_mode = VppEnum.vl_api_af_packet_mode_t
 399         af_packet_interface_mode = af_packet_mode.AF_PACKET_API_MODE_ETHERNET
 400         af_packet_flags = VppEnum.vl_api_af_packet_flags_t
 401         af_packet_interface_flags = af_packet_flags.AF_PACKET_API_FLAG_QDISC_BYPASS
 402         if enable_gso:
 403             af_packet_interface_flags = (
 404                 af_packet_interface_flags | af_packet_flags.AF_PACKET_API_FLAG_CKSUM_GSO
 405             )
 406         if version == 2:
 407             af_packet_interface_flags = (
 408                 af_packet_interface_flags | af_packet_flags.AF_PACKET_API_FLAG_VERSION_2
 409             )
 410         api_args = {
 411             "use_random_hw_addr": True,
 412             "host_if_name": host_if_name,
 413             "flags": af_packet_interface_flags,
 414         }
 415         api_args["mode"] = af_packet_interface_mode
 416         result = self.vapi.af_packet_create_v3(**api_args)
 417         sw_if_index = result.sw_if_index
 418         # Enable software GSO chunking when interface doesn't support GSO offload
 419         if enable_gso == 0:
 420             self.vapi.feature_gso_enable_disable(
 421                 sw_if_index=sw_if_index, enable_disable=1
 422             )
 423         else:
 424             self.vapi.feature_gso_enable_disable(
 425                 sw_if_index=sw_if_index, enable_disable=0
 426             )
 427         self.vapi.sw_interface_set_flags(sw_if_index=sw_if_index, flags=1)
 428         return sw_if_index
 429
 430     def create_tap_tun(
 431         self,
 432         id,
 433         host_namespace,
 434         ip_version,
 435         host_ip4_prefix=None,
 436         host_ip6_prefix=None,
 437         host_ip4_gw=None,
 438         host_ip6_gw=None,
 439         int_type="tap",
 440         host_if_name=None,
 441         enable_gso=0,
 442         enable_gro=0,
 443     ):
 444         """Create a tapv2 or tunv2 interface in VPP and attach to host.
 445
 446         Parameters:
 447         id -- interface ID
 448         host_namespace -- host namespace to attach the tap/tun interface to
 449         ip_version -- 4 or 6
 450         host_ip4_prefix -- ipv4 host interface address in CIDR notation
 451                            if ip_version=4
 452         host_ip6_prefix -- ipv6 host interface address in CIDR notation
 453                            if ip_version=6
 454         host_ip4_gw -- host IPv4 default gateway IP Address
 455         host_ip6_gw -- host IPv6 default gateway IP address
 456         int_type -- "tap" for tapv2  &  "tun" for tunv2 interface
 457         host_if_name -- host side interface name
 458         enable_gso -- enable GSO
 459         enable_gro -- enable GSO/GRO-Coalesce
 460         """
 461         TapFlags = VppEnum.vl_api_tap_flags_t
 462         tap_flags = 0
 463         if int_type == "tun":
 464             tap_flags = TapFlags.TAP_API_FLAG_TUN
 465             if enable_gro:
 466                 tap_flags = tap_flags | (
 467                     TapFlags.TAP_API_FLAG_GSO | TapFlags.TAP_API_FLAG_GRO_COALESCE
 468                 )
 469             elif enable_gso:
 470                 tap_flags = tap_flags | TapFlags.TAP_API_FLAG_GSO
 471         elif int_type == "tap":
 472             if enable_gro:
 473                 tap_flags = (
 474                     TapFlags.TAP_API_FLAG_GSO | TapFlags.TAP_API_FLAG_GRO_COALESCE
 475                 )
 476             elif enable_gso:
 477                 tap_flags = TapFlags.TAP_API_FLAG_GSO
 478
 479         api_args = {
 480             "id": id,
 481             "host_namespace_set": True,
 482             "host_namespace": host_namespace,
 483             "host_if_name_set": False,
 484             "host_bridge_set": False,
 485             "host_mac_addr_set": False,
 486         }
 487         if tap_flags != 0:
 488             api_args["tap_flags"] = tap_flags
 489         if ip_version == 4:
 490             api_args["host_ip4_prefix"] = ip_interface(host_ip4_prefix)
 491             api_args["host_ip4_prefix_set"] = True
 492             if host_ip4_gw:
 493                 api_args["host_ip4_gw"] = ip_address(host_ip4_gw)
 494                 api_args["host_ip4_gw_set"] = True
 495         if ip_version == 6:
 496             api_args["host_ip6_prefix"] = ip_interface(host_ip6_prefix)
 497             api_args["host_ip6_prefix_set"] = True
 498             if host_ip6_gw:
 499                 api_args["host_ip6_gw"] = ip_address(host_ip6_gw)
 500                 api_args["host_ip6_gw_set"] = True
 501         if host_if_name:
 502             api_args["host_if_name"] = host_if_name
 503             api_args["host_if_name_set"] = True
 504
 505         result = self.vapi.tap_create_v2(**api_args)
 506         sw_if_index = result.sw_if_index
 507         # Enable software GSO chunking when interface doesn't support GSO offload and
 508         # GRO coalesce
 509         if enable_gso == 0 and enable_gro == 0:
 510             self.vapi.feature_gso_enable_disable(
 511                 sw_if_index=sw_if_index, enable_disable=1
 512             )
 513         else:
 514             self.vapi.feature_gso_enable_disable(
 515                 sw_if_index=sw_if_index, enable_disable=0
 516             )
 517         # Admin up
 518         self.vapi.sw_interface_set_flags(sw_if_index=sw_if_index, flags=1)
 519         return sw_if_index
 520
 521     def dump_bridge_domain_details(self, bd_id):
 522         return self.vapi.bridge_domain_dump(bd_id=bd_id)
 523
 524     def l2_connect_interfaces(self, bridge_id, *sw_if_idxs):
 525         for if_idx in sw_if_idxs:
 526             self.vapi.sw_interface_set_l2_bridge(
 527                 rx_sw_if_index=if_idx, bd_id=bridge_id, shg=0, port_type=0, enable=True
 528             )
 529
 530     def l3_connect_interfaces(self, ip_version, vrf_id, *if_idx_ip_prefixes):
 531         """Setup routing for (if_idx, ip_prefix) inside VPP.
 532
 533         arguments:
 534         if_idx_ip_prefixes -- sequence of (if_idx, ip_prefix) tuples
 535         ip_version -- 4 or 6
 536         vrf_id -- vrf_id
 537         """
 538         is_ipv6 = 0 if ip_version == 4 else 1
 539         self.vapi.ip_table_add_del(
 540             is_add=1, table={"table_id": vrf_id, "is_ip6": is_ipv6}
 541         )
 542         for sw_if_index, ip_prefix in if_idx_ip_prefixes:
 543             self.vapi.sw_interface_set_table(
 544                 sw_if_index=sw_if_index, is_ipv6=is_ipv6, vrf_id=vrf_id
 545             )
 546             self.vapi.sw_interface_add_del_address(
 547                 sw_if_index=sw_if_index, is_add=1, prefix=ip_interface(ip_prefix)
 548             )
 549
 550     def set_interfaces_mtu(self, mtu, ip_version, **kwargs):
 551         """Set MTUs on VPP and Linux interfaces.
 552
 553         arguments --
 554         mtu -- mtu value
 555         ip_version - 4 or 6
 556         kwargs['vpp_interfaces'] -- list of vpp interface if indexes
 557         kwargs['linux_interfaces'] -- list of tuples (namespace, interface_names)
 558         return True if mtu is set, else False
 559         """
 560         vpp_interfaces = kwargs.get("vpp_interfaces")
 561         linux_interfaces = kwargs.get("linux_interfaces")
 562         # IPv6 on Linux requires an MTU value >=1280
 563         if (ip_version == 6 and mtu >= 1280) or ip_version == 4:
 564             for sw_if_idx in vpp_interfaces:
 565                 self.vapi.sw_interface_set_mtu(
 566                     sw_if_index=sw_if_idx, mtu=[mtu, 0, 0, 0]
 567                 )
 568             for namespace, interface_name in linux_interfaces:
 569                 set_interface_mtu(
 570                     namespace=namespace,
 571                     interface=interface_name,
 572                     mtu=mtu,
 573                     logger=self.logger,
 574                 )
 575             return True
 576         else:
 577             return False
 578
 579
 580 generate_vpp_interface_tests()
 581
 582 if __name__ == "__main__":
 583     unittest.main(testRunner=VppTestRunner)