tests: memif interface tests using libmemif

Type: test

Change-Id: I711dfe65ad542a45acd484f0b4e3e6ade9576f66
Signed-off-by: Naveen Joy <najoy@cisco.com>

5 files changed, 305 insertions, 139 deletions

diff --git a/test/asf/asfframework.py b/test/asf/asfframework.py
index 5bcbfccd269..24880044cec 100644
--- a/test/asf/asfframework.py
+++ b/test/asf/asfframework.py
@@ -583,6 +583,10 @@ class VppAsfTestCase(CPUInterface, unittest.TestCase):
         return "%s/api.sock" % cls.tempdir
 
     @classmethod
+    def get_memif_sock_path(cls):
+        return "%s/memif.sock" % cls.tempdir
+
+    @classmethod
     def get_api_segment_prefix(cls):
         return os.path.basename(cls.tempdir)  # Only used for VAPI
 
diff --git a/test/test_vm_vpp_interfaces.py b/test/test_vm_vpp_interfaces.py
index 917b95006c4..0c90325e35a 100644
--- a/test/test_vm_vpp_interfaces.py
+++ b/test/test_vm_vpp_interfaces.py
@@ -9,6 +9,7 @@ from vpp_qemu_utils import (
     set_interface_mtu,
     disable_interface_gso,
     add_namespace_route,
+    libmemif_test_app,
 )
 from vpp_iperf import start_iperf, stop_iperf
 from framework import VppTestCase
@@ -21,7 +22,7 @@ from vm_test_config import test_config
 
 #
 # Tests for:
-# - tapv2, tunv2 & af_packet_v2 & v3 interfaces.
+# - tapv2, tunv2, af_packet_v2/v3 & memif interfaces.
 # - reads test config from the file vm_test_config.py
 # - Uses iPerf to send TCP/IP streams to VPP
 #   - VPP ingress interface runs the iperf client
@@ -79,7 +80,11 @@ def create_test(test_name, test, ip_version, mtu):
             vpp_interfaces=self.vpp_interfaces,
             linux_interfaces=self.linux_interfaces,
         )
-        # Start the Iperf server in dual stack mode & run iperf client
+        if "memif" in self.if_types:
+            self.logger.debug("Starting libmemif test_app for memif test")
+            self.memif_process = libmemif_test_app(
+                memif_sock_path=self.get_memif_sock_path(), logger=self.logger
+            )
         if result is True:
             start_iperf(ip_version=6, server_only=True, logger=self.logger)
             self.assertTrue(
@@ -156,8 +161,11 @@ class TestVPPInterfacesQemu(VppTestCase):
         3. Cross-Connect interfaces in VPP using L2 or L3.
         """
         super(TestVPPInterfacesQemu, self).setUp()
-        client_if_type = test["client_if_type"]
-        server_if_type = test["server_if_type"]
+        # Need to support multiple interface types as the memif interface
+        # in VPP is connected to the iPerf client & server by x-connecting
+        # to a tap interface in their respective namespaces.
+        client_if_types = test["client_if_type"].split(",")
+        server_if_types = test["server_if_type"].split(",")
         client_if_version = test["client_if_version"]
         server_if_version = test["server_if_version"]
         x_connect_mode = test["x_connect_mode"]
@@ -188,6 +196,11 @@ class TestVPPInterfacesQemu(VppTestCase):
         )
         vpp_server_nexthop = str(ip_interface(vpp_server_prefix).ip)
         create_namespace([client_namespace, server_namespace])
+        # IPerf client & server ingress/egress interface indexes in VPP
+        self.tap_interfaces = []
+        self.memif_interfaces = []
+        self.ingress_if_idxes = []
+        self.egress_if_idxes = []
         self.vpp_interfaces = []
         self.linux_interfaces = []
         enable_client_if_gso = test.get("client_if_gso", 0)
@@ -197,155 +210,197 @@ class TestVPPInterfacesQemu(VppTestCase):
         enable_client_if_checksum_offload = test.get("client_if_checksum_offload", 0)
         enable_server_if_checksum_offload = test.get("server_if_checksum_offload", 0)
         ## Handle client interface types
-        if client_if_type == "af_packet":
-            create_host_interface(
-                af_packet_config["iprf_client_interface_on_linux"],
-                af_packet_config["iprf_client_interface_on_vpp"],
-                client_namespace,
-                layer2["client_ip4_prefix"]
-                if x_connect_mode == "L2"
-                else layer3["client_ip4_prefix"],
-                layer2["client_ip6_prefix"]
-                if x_connect_mode == "L2"
-                else layer3["client_ip6_prefix"],
-            )
-            self.ingress_if_idx = self.create_af_packet(
-                version=client_if_version,
-                host_if_name=af_packet_config["iprf_client_interface_on_vpp"],
-                enable_gso=enable_client_if_gso,
-            )
-            self.vpp_interfaces.append(self.ingress_if_idx)
-            self.linux_interfaces.append(
-                ["", af_packet_config["iprf_client_interface_on_vpp"]]
-            )
-            self.linux_interfaces.append(
-                [client_namespace, af_packet_config["iprf_client_interface_on_linux"]]
-            )
-            if enable_client_if_gso == 0:
-                disable_interface_gso(
-                    "", af_packet_config["iprf_client_interface_on_vpp"]
+        for client_if_type in client_if_types:
+            if client_if_type == "af_packet":
+                create_host_interface(
+                    af_packet_config["iprf_client_interface_on_linux"],
+                    af_packet_config["iprf_client_interface_on_vpp"],
+                    client_namespace,
+                    layer2["client_ip4_prefix"]
+                    if x_connect_mode == "L2"
+                    else layer3["client_ip4_prefix"],
+                    layer2["client_ip6_prefix"]
+                    if x_connect_mode == "L2"
+                    else layer3["client_ip6_prefix"],
                 )
-                disable_interface_gso(
-                    client_namespace, af_packet_config["iprf_client_interface_on_linux"]
+                self.ingress_if_idx = self.create_af_packet(
+                    version=client_if_version,
+                    host_if_name=af_packet_config["iprf_client_interface_on_vpp"],
+                    enable_gso=enable_client_if_gso,
                 )
-        elif client_if_type == "tap" or client_if_type == "tun":
-            self.ingress_if_idx = self.create_tap_tun(
-                id=101,
-                host_namespace=client_namespace,
-                ip_version=ip_version,
-                host_ip4_prefix=layer2["client_ip4_prefix"]
-                if x_connect_mode == "L2"
-                else layer3["client_ip4_prefix"],
-                host_ip6_prefix=layer2["client_ip6_prefix"]
-                if x_connect_mode == "L2"
-                else layer3["client_ip6_prefix"],
-                host_ip4_gw=vpp_client_nexthop
-                if x_connect_mode == "L3" and ip_version == 4
-                else None,
-                host_ip6_gw=vpp_client_nexthop
-                if x_connect_mode == "L3" and ip_version == 6
-                else None,
-                int_type=client_if_type,
-                host_if_name=f"{client_if_type}0",
-                enable_gso=enable_client_if_gso,
-                enable_gro=enable_client_if_gro,
-                enable_checksum_offload=enable_client_if_checksum_offload,
-            )
-            self.vpp_interfaces.append(self.ingress_if_idx)
-            self.linux_interfaces.append([client_namespace, f"{client_if_type}0"])
-            # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
-            disable_interface_gso(client_namespace, f"{client_if_type}0")
-        else:
-            print(
-                f"Unsupported client interface type: {client_if_type} "
-                f"for test - ID={test['id']}"
-            )
-            sys.exit(1)
-
-        if server_if_type == "af_packet":
-            create_host_interface(
-                af_packet_config["iprf_server_interface_on_linux"],
-                af_packet_config["iprf_server_interface_on_vpp"],
-                server_namespace,
-                server_ip4_prefix,
-                server_ip6_prefix,
-            )
-            self.egress_if_idx = self.create_af_packet(
-                version=server_if_version,
-                host_if_name=af_packet_config["iprf_server_interface_on_vpp"],
-                enable_gso=enable_server_if_gso,
-            )
-            self.vpp_interfaces.append(self.egress_if_idx)
-            self.linux_interfaces.append(
-                ["", af_packet_config["iprf_server_interface_on_vpp"]]
-            )
-            self.linux_interfaces.append(
-                [server_namespace, af_packet_config["iprf_server_interface_on_linux"]]
-            )
-            if enable_server_if_gso == 0:
-                disable_interface_gso(
-                    "", af_packet_config["iprf_server_interface_on_vpp"]
+                self.ingress_if_idxes.append(self.ingress_if_idx)
+                self.vpp_interfaces.append(self.ingress_if_idx)
+                self.linux_interfaces.append(
+                    ["", af_packet_config["iprf_client_interface_on_vpp"]]
                 )
-                disable_interface_gso(
-                    server_namespace, af_packet_config["iprf_server_interface_on_linux"]
+                self.linux_interfaces.append(
+                    [
+                        client_namespace,
+                        af_packet_config["iprf_client_interface_on_linux"],
+                    ]
                 )
-        elif server_if_type == "tap" or server_if_type == "tun":
-            self.egress_if_idx = self.create_tap_tun(
-                id=102,
-                host_namespace=server_namespace,
-                ip_version=ip_version,
-                host_ip4_prefix=layer2["server_ip4_prefix"]
-                if x_connect_mode == "L2"
-                else layer3["server_ip4_prefix"],
-                host_ip6_prefix=layer2["server_ip6_prefix"]
-                if x_connect_mode == "L2"
-                else layer3["server_ip6_prefix"],
-                int_type=server_if_type,
-                host_if_name=f"{server_if_type}0",
-                enable_gso=enable_server_if_gso,
-                enable_gro=enable_server_if_gro,
-                enable_checksum_offload=enable_server_if_checksum_offload,
-            )
-            self.vpp_interfaces.append(self.egress_if_idx)
-            self.linux_interfaces.append([server_namespace, f"{server_if_type}0"])
-            # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
-            disable_interface_gso(server_namespace, f"{server_if_type}0")
-        else:
-            print(
-                f"Unsupported server interface type: {server_if_type} "
-                f"for test - ID={test['id']}"
-            )
-            sys.exit(1)
-
-        if x_connect_mode == "L2":
-            self.l2_connect_interfaces(1, self.ingress_if_idx, self.egress_if_idx)
-        elif x_connect_mode == "L3":
-            # L3 connect client & server side
-            vrf_id = layer3["ip4_vrf"] if ip_version == 4 else layer3["ip6_vrf"]
-            self.l3_connect_interfaces(
-                ip_version,
-                vrf_id,
-                (self.ingress_if_idx, vpp_client_prefix),
-                (self.egress_if_idx, vpp_server_prefix),
-            )
-            # Setup namespace routing
-            if ip_version == 4:
-                add_namespace_route(client_namespace, "0.0.0.0/0", vpp_client_nexthop)
-                add_namespace_route(server_namespace, "0.0.0.0/0", vpp_server_nexthop)
+                if enable_client_if_gso == 0:
+                    disable_interface_gso(
+                        "", af_packet_config["iprf_client_interface_on_vpp"]
+                    )
+                    disable_interface_gso(
+                        client_namespace,
+                        af_packet_config["iprf_client_interface_on_linux"],
+                    )
+            elif client_if_type == "tap" or client_if_type == "tun":
+                self.ingress_if_idx = self.create_tap_tun(
+                    id=101,
+                    host_namespace=client_namespace,
+                    ip_version=ip_version,
+                    host_ip4_prefix=layer2["client_ip4_prefix"]
+                    if x_connect_mode == "L2"
+                    else layer3["client_ip4_prefix"],
+                    host_ip6_prefix=layer2["client_ip6_prefix"]
+                    if x_connect_mode == "L2"
+                    else layer3["client_ip6_prefix"],
+                    host_ip4_gw=vpp_client_nexthop
+                    if x_connect_mode == "L3" and ip_version == 4
+                    else None,
+                    host_ip6_gw=vpp_client_nexthop
+                    if x_connect_mode == "L3" and ip_version == 6
+                    else None,
+                    int_type=client_if_type,
+                    host_if_name=f"{client_if_type}0",
+                    enable_gso=enable_client_if_gso,
+                    enable_gro=enable_client_if_gro,
+                    enable_checksum_offload=enable_client_if_checksum_offload,
+                )
+                self.tap_interfaces.append(self.ingress_if_idx)
+                self.ingress_if_idxes.append(self.ingress_if_idx)
+                self.vpp_interfaces.append(self.ingress_if_idx)
+                self.linux_interfaces.append([client_namespace, f"{client_if_type}0"])
+                # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
+                disable_interface_gso(client_namespace, f"{client_if_type}0")
+            elif client_if_type == "memif":
+                self.ingress_if_idx = self.create_memif(
+                    memif_id=0, mode=0 if x_connect_mode == "L2" else 1
+                )
+                self.memif_interfaces.append(self.ingress_if_idx)
+                self.ingress_if_idxes.append(self.ingress_if_idx)
+                self.vpp_interfaces.append(self.ingress_if_idx)
+            else:
+                print(
+                    f"Unsupported client interface type: {client_if_type} "
+                    f"for test - ID={test['id']}"
+                )
+                sys.exit(1)
+        for server_if_type in server_if_types:
+            if server_if_type == "af_packet":
+                create_host_interface(
+                    af_packet_config["iprf_server_interface_on_linux"],
+                    af_packet_config["iprf_server_interface_on_vpp"],
+                    server_namespace,
+                    server_ip4_prefix,
+                    server_ip6_prefix,
+                )
+                self.egress_if_idx = self.create_af_packet(
+                    version=server_if_version,
+                    host_if_name=af_packet_config["iprf_server_interface_on_vpp"],
+                    enable_gso=enable_server_if_gso,
+                )
+                self.egress_if_idxes.append(self.egress_if_idx)
+                self.vpp_interfaces.append(self.egress_if_idx)
+                self.linux_interfaces.append(
+                    ["", af_packet_config["iprf_server_interface_on_vpp"]]
+                )
+                self.linux_interfaces.append(
+                    [
+                        server_namespace,
+                        af_packet_config["iprf_server_interface_on_linux"],
+                    ]
+                )
+                if enable_server_if_gso == 0:
+                    disable_interface_gso(
+                        "", af_packet_config["iprf_server_interface_on_vpp"]
+                    )
+                    disable_interface_gso(
+                        server_namespace,
+                        af_packet_config["iprf_server_interface_on_linux"],
+                    )
+            elif server_if_type == "tap" or server_if_type == "tun":
+                self.egress_if_idx = self.create_tap_tun(
+                    id=102,
+                    host_namespace=server_namespace,
+                    ip_version=ip_version,
+                    host_ip4_prefix=layer2["server_ip4_prefix"]
+                    if x_connect_mode == "L2"
+                    else layer3["server_ip4_prefix"],
+                    host_ip6_prefix=layer2["server_ip6_prefix"]
+                    if x_connect_mode == "L2"
+                    else layer3["server_ip6_prefix"],
+                    int_type=server_if_type,
+                    host_if_name=f"{server_if_type}0",
+                    enable_gso=enable_server_if_gso,
+                    enable_gro=enable_server_if_gro,
+                    enable_checksum_offload=enable_server_if_checksum_offload,
+                )
+                self.tap_interfaces.append(self.egress_if_idx)
+                self.egress_if_idxes.append(self.egress_if_idx)
+                self.vpp_interfaces.append(self.egress_if_idx)
+                self.linux_interfaces.append([server_namespace, f"{server_if_type}0"])
+                # Seeing TCP timeouts if tx=on & rx=on Linux tap & tun interfaces
+                disable_interface_gso(server_namespace, f"{server_if_type}0")
+            elif server_if_type == "memif":
+                self.egress_if_idx = self.create_memif(
+                    memif_id=1, mode=0 if x_connect_mode == "L2" else 1
+                )
+                self.memif_interfaces.append(self.egress_if_idx)
+                self.egress_if_idxes.append(self.egress_if_idx)
+                self.vpp_interfaces.append(self.egress_if_idx)
             else:
-                add_namespace_route(client_namespace, "::/0", vpp_client_nexthop)
-                add_namespace_route(server_namespace, "::/0", vpp_server_nexthop)
+                print(
+                    f"Unsupported server interface type: {server_if_type} "
+                    f"for test - ID={test['id']}"
+                )
+                sys.exit(1)
+        self.if_types = set(client_if_types).union(set(server_if_types))
+        # for memif testing: tapv2, memif & libmemif_app are connected
+        if "memif" not in self.if_types:
+            if x_connect_mode == "L2":
+                self.l2_connect_interfaces(1, self.ingress_if_idx, self.egress_if_idx)
+            elif x_connect_mode == "L3":
+                # L3 connect client & server side
+                vrf_id = layer3["ip4_vrf"] if ip_version == 4 else layer3["ip6_vrf"]
+                self.l3_connect_interfaces(
+                    ip_version,
+                    vrf_id,
+                    (self.ingress_if_idx, vpp_client_prefix),
+                    (self.egress_if_idx, vpp_server_prefix),
+                )
+                # Setup namespace routing
+                if ip_version == 4:
+                    add_namespace_route(
+                        client_namespace, "0.0.0.0/0", vpp_client_nexthop
+                    )
+                    add_namespace_route(
+                        server_namespace, "0.0.0.0/0", vpp_server_nexthop
+                    )
+                else:
+                    add_namespace_route(client_namespace, "::/0", vpp_client_nexthop)
+                    add_namespace_route(server_namespace, "::/0", vpp_server_nexthop)
+        else:
+            # connect: ingress tap & memif & egress tap and memif interfaces
+            if x_connect_mode == "L2":
+                self.l2_connect_interfaces(1, *self.ingress_if_idxes)
+                self.l2_connect_interfaces(2, *self.egress_if_idxes)
         # Wait for Linux IPv6 stack to become ready
         if ip_version == 6:
             time.sleep(2)
 
     def tearDown(self):
         try:
-            self.vapi.tap_delete_v2(self.ingress_if_idx)
+            for interface_if_idx in self.tap_interfaces:
+                self.vapi.tap_delete_v2(sw_if_index=interface_if_idx)
         except Exception:
             pass
         try:
-            self.vapi.tap_delete_v2(self.egress_if_idx)
+            for interface_if_idx in self.memif_interfaces:
+                self.vapi.memif_delete(sw_if_index=interface_if_idx)
         except Exception:
             pass
         try:
@@ -384,6 +439,11 @@ class TestVPPInterfacesQemu(VppTestCase):
         except Exception:
             pass
         try:
+            self.vapi.bridge_domain_add_del_v2(bd_id=1, is_add=0)
+            self.vapi.bridge_domain_add_del_v2(bd_id=2, is_add=0)
+        except Exception:
+            pass
+        try:
             delete_namespace(
                 [
                     client_namespace,
@@ -396,6 +456,12 @@ class TestVPPInterfacesQemu(VppTestCase):
             stop_iperf()
         except Exception:
             pass
+        try:
+            if self.memif_process:
+                self.memif_process.terminate()
+                self.memif_process.join()
+        except Exception:
+            pass
 
     def create_af_packet(self, version, host_if_name, enable_gso=0):
         """Create an af_packetv3 interface in VPP.
@@ -535,6 +601,21 @@ class TestVPPInterfacesQemu(VppTestCase):
         self.vapi.sw_interface_set_flags(sw_if_index=sw_if_index, flags=1)
         return sw_if_index
 
+    def create_memif(self, memif_id, mode):
+        """Create memif interface in VPP.
+
+        Parameters:
+        memif_id: A unique ID for the memif interface
+        mode: 0 = ethernet, 1 = ip, 2 = punt/inject
+        """
+        # create memif interface with role=0 (i.e. master)
+        result = self.vapi.memif_create_v2(
+            role=0, mode=mode, id=memif_id, buffer_size=9216
+        )
+        sw_if_index = result.sw_if_index
+        self.vapi.sw_interface_set_flags(sw_if_index=sw_if_index, flags=1)
+        return sw_if_index
+
     def dump_bridge_domain_details(self, bd_id):
         return self.vapi.bridge_domain_dump(bd_id=bd_id)
 
diff --git a/test/vm_test_config.py b/test/vm_test_config.py
index 7c8aa4caeef..60db4d1f18b 100644
--- a/test/vm_test_config.py
+++ b/test/vm_test_config.py
@@ -318,5 +318,15 @@ test_config = {
             "server_if_checksum_offload": 0,
             "x_connect_mode": "L3",
         },
+        {
+            "id": 27,
+            "client_if_type": "tap,memif",
+            "client_if_version": 2,
+            "client_if_checksum_offload": 0,
+            "server_if_type": "tap,memif",
+            "server_if_version": 2,
+            "server_if_checksum_offload": 0,
+            "x_connect_mode": "L2",
+        },
     ],
 }
diff --git a/test/vpp_qemu_utils.py b/test/vpp_qemu_utils.py
index 3a8fdc8daf5..03b8632b15f 100644
--- a/test/vpp_qemu_utils.py
+++ b/test/vpp_qemu_utils.py
@@ -4,6 +4,8 @@
 
 import subprocess
 import sys
+import os
+import multiprocessing as mp
 
 
 def can_create_namespaces(namespace="vpp_chk_4212"):
@@ -243,3 +245,64 @@ def list_namespace(ns):
         subprocess.run(["ip", "netns", "exec", ns, "ip", "addr"])
     except subprocess.CalledProcessError as e:
         raise Exception("Error listing namespace IP:", e.output)
+
+
+def libmemif_test_app(memif_sock_path, logger):
+    """Build & run the libmemif test_app for memif interface testing."""
+    test_dir = os.path.dirname(os.path.realpath(__file__))
+    ws_root = os.path.dirname(test_dir)
+    libmemif_app = os.path.join(
+        ws_root, "extras", "libmemif", "build", "examples", "test_app"
+    )
+
+    def build_libmemif_app():
+        if not os.path.exists(libmemif_app):
+            print(f"Building app:{libmemif_app} for memif interface testing")
+            libmemif_app_dir = os.path.join(ws_root, "extras", "libmemif", "build")
+            if not os.path.exists(libmemif_app_dir):
+                os.makedirs(libmemif_app_dir)
+            os.chdir(libmemif_app_dir)
+            try:
+                p = subprocess.run(["cmake", ".."], capture_output=True)
+                logger.debug(p.stdout)
+                if p.returncode != 0:
+                    print(f"libmemif app:{libmemif_app} cmake error:{p.stderr}")
+                    sys.exit(1)
+                p = subprocess.run(["make"], capture_output=True)
+                logger.debug(p.stdout)
+                if p.returncode != 0:
+                    print(f"Error building libmemif app:{p.stderr}")
+                    sys.exit(1)
+            except subprocess.CalledProcessError as e:
+                raise Exception("Error building libmemif_test_app:", e.output)
+
+    def start_libmemif_app():
+        """Restart once if the initial run fails."""
+        max_tries = 2
+        run = 0
+        if not os.path.exists(libmemif_app):
+            raise Exception(
+                f"Error could not locate the libmemif test app:{libmemif_app}"
+            )
+        args = [libmemif_app, "-b", "9216", "-s", memif_sock_path]
+        while run < max_tries:
+            try:
+                process = subprocess.run(args, capture_output=True)
+                logger.debug(process.stdout)
+                if process.returncode != 0:
+                    msg = f"Error starting libmemif app:{libmemif_app}"
+                    logger.error(msg)
+                    raise Exception(msg)
+            except Exception:
+                msg = f"re-starting libmemif app:{libmemif_app}"
+                logger.error(msg)
+                continue
+            else:
+                break
+            finally:
+                run += 1
+
+    build_libmemif_app()
+    process = mp.Process(target=start_libmemif_app)
+    process.start()
+    return process
diff --git a/test/vpp_running.py b/test/vpp_running.py
index f31a1327b4a..43377b65c6a 100644
--- a/test/vpp_running.py
+++ b/test/vpp_running.py
@@ -26,6 +26,7 @@ def use_running(cls):
         RunningVPP.get_set_vpp_sock_files()
         cls.get_stats_sock_path = RunningVPP.get_stats_sock_path
         cls.get_api_sock_path = RunningVPP.get_api_sock_path
+        cls.get_memif_sock_path = RunningVPP.get_memif_sock_path
         cls.run_vpp = RunningVPP.run_vpp
         cls.quit_vpp = RunningVPP.quit_vpp
         cls.vpp = RunningVPP
@@ -36,6 +37,7 @@ def use_running(cls):
 class RunningVPP:
     api_sock = ""  # api_sock file path
     stats_sock = ""  # stats sock_file path
+    memif_sock = ""  # memif sock path
     socket_dir = ""  # running VPP's socket directory
     pid = None  # running VPP's pid
     returncode = None  # indicates to the framework that VPP is running
@@ -49,6 +51,10 @@ class RunningVPP:
         return cls.api_sock
 
     @classmethod
+    def get_memif_sock_path(cls):
+        return cls.memif_sock
+
+    @classmethod
     def run_vpp(cls):
         """VPP is already running -- skip this action."""
         pass
@@ -112,6 +118,8 @@ class RunningVPP:
                     cls.api_sock = os.path.abspath(sock_file)
                 elif "stats.sock" in sock_file:
                     cls.stats_sock = os.path.abspath(sock_file)
+                elif "memif.sock" in sock_file:
+                    cls.memif_sock = os.path.abspath(sock_file)
             if not cls.api_sock:
                 print(
                     f"Error: Could not find a valid api.sock file "