Hoststack perf infrastructure refactoring

- DUT only topology (hoststack test
  apps are co-located with vpp)
- Make vpp app specific keywords generic
  where applicable
- Add IP4 Prefix to topology file
- Support running wrk in linux namespace
- Refactor namespace cleanup
- Remove redundant namespace creation code
- Refactor test/keyword dirs: tcp -> hoststack
- Add hoststack utility keywords
- Refactor wrk suite setup/teardown
- Update tests with recent perf infra changes

Change-Id: Ia1cf07978d579393eef94923819a87c8c1f36f34
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>

10 files changed, 561 insertions, 57 deletions

diff --git a/resources/libraries/python/Constants.py b/resources/libraries/python/Constants.py
index 0a8470ec65..dc9eda7505 100644
--- a/resources/libraries/python/Constants.py
+++ b/resources/libraries/python/Constants.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -224,6 +224,12 @@ class Constants:
         u"FAIL_ON_CRC_MISMATCH"
     )
 
+    # Default IP4 prefix length (if not defined in topology file)
+    DEFAULT_IP4_PREFIX_LENGTH = u"24"
+
+    # Maximum number of interfaces in a data path
+    DATAPATH_INTERFACES_MAX = 100
+
     # Mapping from NIC name to its bps limit.
     NIC_NAME_TO_BPS_LIMIT = {
         u"Cisco-VIC-1227": 10000000000,
diff --git a/resources/libraries/python/CoreDumpUtil.py b/resources/libraries/python/CoreDumpUtil.py
index 57f0c1d896..e1c7b65765 100644
--- a/resources/libraries/python/CoreDumpUtil.py
+++ b/resources/libraries/python/CoreDumpUtil.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -113,7 +113,7 @@ class CoreDumpUtil:
         :type node: dict
         """
         if node[u"type"] == NodeType.DUT and self.is_core_limit_enabled():
-            vpp_pid = DUTSetup.get_vpp_pid(node)
+            vpp_pid = DUTSetup.get_pid(node, u"vpp")
             self.enable_coredump_limit(node, vpp_pid)
 
     def enable_coredump_limit_vpp_on_all_duts(self, nodes):
diff --git a/resources/libraries/python/DUTSetup.py b/resources/libraries/python/DUTSetup.py
index d0da4645d2..431ccfb8ae 100644
--- a/resources/libraries/python/DUTSetup.py
+++ b/resources/libraries/python/DUTSetup.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -13,10 +13,11 @@
 
 """DUT setup library."""
 
+from time import sleep
 from robot.api import logger
 
 from resources.libraries.python.Constants import Constants
-from resources.libraries.python.ssh import SSH, exec_cmd_no_error
+from resources.libraries.python.ssh import SSH, exec_cmd, exec_cmd_no_error
 from resources.libraries.python.topology import NodeType, Topology
 
 
@@ -157,11 +158,62 @@ class DUTSetup:
                 DUTSetup.stop_service(node, service)
 
     @staticmethod
-    def get_vpp_pid(node):
-        """Get PID of running VPP process.
+    def kill_program(node, program, namespace=None):
+        """Kill program on the specified topology node.
+
+        :param node: Topology node.
+        :param program: Program name.
+        :param namespace: Namespace program is running in.
+        :type node: dict
+        :type program: str
+        :type namespace: str
+        """
+        host = node[u"host"]
+        cmd_timeout = 5
+        if namespace in (None, u"default"):
+            shell_cmd = u"sh -c"
+        else:
+            shell_cmd = f"ip netns exec {namespace} sh -c"
+
+        pgrep_cmd = f"{shell_cmd} \'pgrep {program}\'"
+        ret_code, _, _ = exec_cmd(node, pgrep_cmd, timeout=cmd_timeout,
+                                  sudo=True)
+        if ret_code == 0:
+            logger.trace(f"{program} is not running on {host}")
+            return
+        ret_code, _, _ = exec_cmd(node, f"{shell_cmd} \'pkill {program}\'",
+                                  timeout=cmd_timeout, sudo=True)
+        for attempt in range(5):
+            ret_code, _, _ = exec_cmd(node, pgrep_cmd, timeout=cmd_timeout,
+                                      sudo=True)
+            if ret_code != 0:
+                logger.trace(f"Attempt {attempt}: {program} is dead on {host}")
+                return
+            sleep(1)
+        logger.trace(f"SIGKILLing {program} on {host}")
+        ret_code, _, _ = exec_cmd(node, f"{shell_cmd} \'pkill -9 {program}\'",
+                                  timeout=cmd_timeout, sudo=True)
+
+    @staticmethod
+    def verify_program_installed(node, program):
+        """Verify that program is installed on the specified topology node.
+
+        :param node: Topology node.
+        :param program: Program name.
+        :type node: dict
+        :type program: str
+        """
+        cmd = f"command -v {program}"
+        exec_cmd_no_error(node, cmd, message=f"{program} is not installed")
+
+    @staticmethod
+    def get_pid(node, process):
+        """Get PID of running process.
 
         :param node: DUT node.
+        :param process: process name.
         :type node: dict
+        :type process: str
         :returns: PID
         :rtype: int
         :raises RuntimeError: If it is not possible to get the PID.
@@ -171,26 +223,24 @@ class DUTSetup:
 
         retval = None
         for i in range(3):
-            logger.trace(f"Try {i}: Get VPP PID")
-            ret_code, stdout, stderr = ssh.exec_command(u"pidof vpp")
+            logger.trace(f"Try {i}: Get {process} PID")
+            ret_code, stdout, stderr = ssh.exec_command(f"pidof {process}")
 
             if int(ret_code):
                 raise RuntimeError(
-                    f"Not possible to get PID of VPP process on node: "
+                    f"Not possible to get PID of {process} process on node: "
                     f"{node[u'host']}\n {stdout + stderr}"
                 )
 
             pid_list = stdout.split()
             if len(pid_list) == 1:
-                retval = int(stdout)
-            elif not pid_list:
-                logger.debug(f"No VPP PID found on node {node[u'host']}")
+                return [int(stdout)]
+            if not pid_list:
+                logger.debug(f"No {process} PID found on node {node[u'host']}")
                 continue
-            else:
-                logger.debug(
-                    f"More then one VPP PID found on node {node[u'host']}"
-                )
-                retval = [int(pid) for pid in pid_list]
+            logger.debug(f"More than one {process} PID found " \
+                         f"on node {node[u'host']}")
+            retval = [int(pid) for pid in pid_list]
 
         return retval
 
@@ -206,7 +256,7 @@ class DUTSetup:
         pids = dict()
         for node in nodes.values():
             if node[u"type"] == NodeType.DUT:
-                pids[node[u"host"]] = DUTSetup.get_vpp_pid(node)
+                pids[node[u"host"]] = DUTSetup.get_pid(node, u"vpp")
         return pids
 
     @staticmethod
diff --git a/resources/libraries/python/HoststackUtil.py b/resources/libraries/python/HoststackUtil.py
new file mode 100644
index 0000000000..9e6e20014c
--- /dev/null
+++ b/resources/libraries/python/HoststackUtil.py
@@ -0,0 +1,287 @@
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# 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.
+
+"""Host Stack util library."""
+from time import sleep
+from robot.api import logger
+
+from resources.libraries.python.ssh import exec_cmd, exec_cmd_no_error
+from resources.libraries.python.PapiExecutor import PapiSocketExecutor
+from resources.libraries.python.DUTSetup import DUTSetup
+
+class HoststackUtil():
+    """Utilities for Host Stack tests."""
+
+    @staticmethod
+    def get_vpp_echo_command(vpp_echo_attributes):
+        """Construct the vpp_echo command using the specified attributes.
+
+        :param vpp_echo_attributes: vpp_echo test program attributes.
+        :type vpp_echo_attributes: dict
+        :returns: Command line components of the vpp_echo command
+            'name' - program name
+            'args' - command arguments.
+        :rtype: dict
+        """
+        # TODO: Use a python class instead of dictionary for the return type
+        proto = vpp_echo_attributes[u"uri_protocol"]
+        addr = vpp_echo_attributes[u"uri_ip4_addr"]
+        port = vpp_echo_attributes[u"uri_port"]
+        vpp_echo_cmd = {}
+        vpp_echo_cmd[u"name"] = u"vpp_echo"
+        vpp_echo_cmd[u"args"] = f"{vpp_echo_attributes[u'role']} " \
+            f"socket-name {vpp_echo_attributes[u'vpp_api_socket']} " \
+            f"{vpp_echo_attributes[u'json_output']} " \
+            f"uri {proto}://{addr}/{port} " \
+            f"nclients {vpp_echo_attributes[u'nclients']} " \
+            f"quic-streams {vpp_echo_attributes[u'quic_streams']} " \
+            f"time {vpp_echo_attributes[u'time']} " \
+            f"fifo-size {vpp_echo_attributes[u'fifo_size']} " \
+            f"TX={vpp_echo_attributes[u'tx_bytes']} " \
+            f"RX={vpp_echo_attributes[u'rx_bytes']}"
+        if vpp_echo_attributes[u"rx_results_diff"]:
+            vpp_echo_cmd[u"args"] += u" rx-results-diff"
+        if vpp_echo_attributes[u"tx_results_diff"]:
+            vpp_echo_cmd[u"args"] += u" tx-results-diff"
+        return vpp_echo_cmd
+
+    @staticmethod
+    def set_hoststack_quic_fifo_size(node, fifo_size):
+        """Set the QUIC protocol fifo size.
+
+        :param node: Node to set the QUIC fifo size on.
+        :param fifo_size: fifo size, passed to the quic set fifo-size command.
+        :type node: dict
+        :type fifo_size: str
+        """
+        cmd = f"quic set fifo-size {fifo_size}"
+        PapiSocketExecutor.run_cli_cmd(node, cmd)
+
+    @staticmethod
+    def set_hoststack_quic_crypto_engine(node, quic_crypto_engine,
+                                         fail_on_error=False):
+        """Set the Hoststack QUIC crypto engine on node
+
+        :param node: Node to enable/disable HostStack.
+        :param quic_crypto_engine: type of crypto engine
+        :type node: dict
+        :type quic_crypto_engine: str
+        """
+        vpp_crypto_engines = {u"openssl", u"ia32", u"ipsecmb"}
+        if quic_crypto_engine == u"nocrypto":
+            logger.trace(u"No QUIC crypto engine.")
+            return
+
+        if quic_crypto_engine in vpp_crypto_engines:
+            cmds = [u"quic set crypto api vpp",
+                    f"set crypto handler aes-128-gcm {quic_crypto_engine}",
+                    f"set crypto handler aes-256-gcm {quic_crypto_engine}"]
+        elif quic_crypto_engine == u"picotls":
+            cmds = [u"quic set crypto api picotls"]
+        else:
+            raise ValueError(f"Unknown QUIC crypto_engine {quic_crypto_engine}")
+
+        for cmd in cmds:
+            try:
+                PapiSocketExecutor.run_cli_cmd(node, cmd)
+            except AssertionError:
+                if fail_on_error:
+                    raise
+
+    @staticmethod
+    def get_hoststack_test_program_logs(node, program):
+        """Get HostStack test program stdout log.
+
+        :param node: DUT node.
+        :param program: test program.
+        :type node: dict
+        :type program: dict
+        """
+        program_name = program[u"name"]
+        cmd = f"sh -c \'cat /tmp/{program_name}_stdout.log\'"
+        stdout_log, _ = exec_cmd_no_error(node, cmd, sudo=True, \
+            message=f"Get {program_name} stdout log failed!")
+
+        cmd = f"sh -c \'cat /tmp/{program_name}_stderr.log\'"
+        stderr_log, _ = exec_cmd_no_error(node, cmd, sudo=True, \
+            message=f"Get {program_name} stderr log failed!")
+        return stdout_log, stderr_log
+
+    @staticmethod
+    def start_hoststack_test_program(node, namespace, program):
+        """Start the specified HostStack test program.
+
+        :param node: DUT node.
+        :param namespace: Net Namespace to run program in.
+        :param program: Test program.
+        :type node: dict
+        :type namespace: str
+        :type program: dict
+        :returns: Process ID
+        :rtype: int
+        :raises RuntimeError: If node subtype is not a DUT or startup failed.
+        """
+        # TODO: Pin test program to core(s) on same numa node as VPP.
+        if node[u"type"] != u"DUT":
+            raise RuntimeError(u"Node type is not a DUT!")
+
+        program_name = program[u"name"]
+        DUTSetup.kill_program(node, program_name, namespace)
+
+        if namespace == u"default":
+            shell_cmd = u"sh -c"
+        else:
+            shell_cmd = f"ip netns exec {namespace} sh -c"
+
+        env_vars = f"{program[u'env_vars']} " if u"env_vars" in program else u""
+        args = program[u"args"]
+        cmd = f"nohup {shell_cmd} \'{env_vars}{program_name} {args} " \
+            f">/tmp/{program_name}_stdout.log " \
+            f"2>/tmp/{program_name}_stderr.log &\'"
+        try:
+            exec_cmd_no_error(node, cmd, sudo=True)
+            return DUTSetup.get_pid(node, program_name)[0]
+        except RuntimeError:
+            stdout_log, stderr_log = \
+                HoststackUtil.get_hoststack_test_program_logs(node,
+                                                              program)
+            raise RuntimeError(f"Start {program_name} failed!\nSTDERR:\n" \
+                               f"{stderr_log}\nSTDOUT:\n{stdout_log}")
+        return None
+
+    @staticmethod
+    def stop_hoststack_test_program(node, program, pid):
+        """Stop the specified Hoststack test program.
+
+        :param node: DUT node.
+        :param program: Test program.
+        :param pid: Process ID of test program.
+        :type node: dict
+        :type program: dict
+        :type pid: int
+        """
+        program_name = program[u"name"]
+        if program_name == u"nginx":
+            cmd = u"nginx -s quit"
+            errmsg = u"Quit nginx failed!"
+        else:
+            cmd = f'if [ -n "$(ps {pid} | grep {program_name})" ] ; ' \
+                f'then kill -s SIGTERM {pid}; fi'
+            errmsg = f"Kill {program_name} ({pid}) failed!"
+
+        exec_cmd_no_error(node, cmd, message=errmsg, sudo=True)
+
+    @staticmethod
+    def hoststack_test_program_finished(node, program_pid):
+        """Wait for the specified HostStack test program process to complete.
+
+        :param node: DUT node.
+        :param program_pid: test program pid.
+        :type node: dict
+        :type program_pid: str
+        :raises RuntimeError: If node subtype is not a DUT.
+        """
+        if node[u"type"] != u"DUT":
+            raise RuntimeError(u"Node type is not a DUT!")
+
+        cmd = f"sh -c 'strace -qqe trace=none -p {program_pid}'"
+        exec_cmd(node, cmd, sudo=True)
+        # Wait a bit for stdout/stderr to be flushed to log files
+        # TODO: see if sub-second sleep works e.g. sleep(0.1)
+        sleep(1)
+
+    @staticmethod
+    def analyze_hoststack_test_program_output(node, role, nsim_attr,
+                                              program):
+        """Gather HostStack test program output and check for errors.
+
+        :param node: DUT node.
+        :param role: Role (client|server) of test program.
+        :param nsim_attr: Network Simulation Attributes.
+        :param program: Test program.
+        :param program_args: List of test program args.
+        :type node: dict
+        :type role: str
+        :type nsim_attr: dict
+        :type program: dict
+        :returns: tuple of no results bool and test program results.
+        :rtype: bool, str
+        :raises RuntimeError: If node subtype is not a DUT.
+        """
+        if node[u"type"] != u"DUT":
+            raise RuntimeError(u"Node type is not a DUT!")
+
+        program_name = program[u"name"]
+        program_stdout, program_stderr = \
+            HoststackUtil.get_hoststack_test_program_logs(node, program)
+        if len(program_stdout) == 0 and len(program_stderr) == 0:
+            logger.trace(f"Retrying {program_name} log retrieval")
+            program_stdout, program_stderr = \
+               HoststackUtil.get_hoststack_test_program_logs(node, program)
+
+        no_results = False
+        env_vars = f"{program[u'env_vars']} " if u"env_vars" in program else u""
+        program_cmd = f"{env_vars}{program_name} {program[u'args']}"
+        test_results = f"Test Results of '{program_cmd}':\n"
+
+        if nsim_attr[u"output_feature_enable"] or \
+            nsim_attr[u"cross_connect_feature_enable"]:
+            if nsim_attr[u"output_feature_enable"]:
+                feature_name = u"output"
+            else:
+                feature_name = u"cross-connect"
+            test_results += \
+                f"NSIM({feature_name}): delay " \
+                f"{nsim_attr[u'delay_in_usec']} usecs, " \
+                f"avg-pkt-size {nsim_attr[u'average_packet_size']}, " \
+                f"bandwidth {nsim_attr[u'bandwidth_in_bits_per_second']} " \
+                f"bits/sec, pkt-drop-rate {nsim_attr[u'packets_per_drop']} " \
+                f"pkts/drop\n"
+
+        if u"error" in program_stderr.lower():
+            test_results += f"ERROR DETECTED:\n{program_stderr}"
+            raise RuntimeError(test_results)
+        if program_stdout:
+            bad_test_results = False
+            if program == u"vpp_echo" and u"JSON stats" not in program_stdout:
+                test_results += u"Invalid test data output!\n"
+                bad_test_results = True
+            test_results += program_stdout
+            if bad_test_results:
+                raise RuntimeError(test_results)
+        else:
+            no_results = True
+            test_results += f"\nNo {program} test data retrieved!\n"
+            cmd = u"ls -l /tmp/*.log"
+            ls_stdout, _ = exec_cmd_no_error(node, cmd, sudo=True)
+            test_results += f"{ls_stdout}\n"
+
+        # TODO: Incorporate show error stats into results analysis
+        host = node[u"host"]
+        test_results += \
+            f"\n{role} VPP 'show errors' on host {host}:\n" \
+            f"{PapiSocketExecutor.run_cli_cmd(node, u'show error')}\n"
+
+        return no_results, test_results
+
+    @staticmethod
+    def no_hoststack_test_program_results(server_no_results, client_no_results):
+        """Return True if no HostStack test program output was gathered.
+
+        :param server_no_results: server no results value.
+        :param client_no_results: client no results value.
+        :type server_no_results: bool
+        :type client_no_results: bool
+        :rtype: bool
+        """
+        return server_no_results and client_no_results
diff --git a/resources/libraries/python/IPUtil.py b/resources/libraries/python/IPUtil.py
index c3df1fe376..1e0d90f065 100644
--- a/resources/libraries/python/IPUtil.py
+++ b/resources/libraries/python/IPUtil.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -12,7 +12,6 @@
 # limitations under the License.
 
 """Common IP utilities library."""
-
 import re
 
 from enum import IntEnum
@@ -25,6 +24,7 @@ from resources.libraries.python.PapiExecutor import PapiSocketExecutor
 from resources.libraries.python.ssh import exec_cmd_no_error, exec_cmd
 from resources.libraries.python.topology import Topology
 from resources.libraries.python.VatExecutor import VatTerminal
+from resources.libraries.python.Namespaces import Namespaces
 
 
 # from vpp/src/vnet/vnet/mpls/mpls_types.h
@@ -243,31 +243,31 @@ class IPUtil:
             raise AssertionError(f"IP addresses are not equal: {ip1} != {ip2}")
 
     @staticmethod
-    def setup_network_namespace(
-            node, namespace_name, interface_name, ip_addr, prefix):
+    def setup_network_namespace(node, namespace_name, interface_name,
+                                ip_addr_list, prefix_length):
         """Setup namespace on given node and attach interface and IP to
         this namespace. Applicable also on TG node.
 
         :param node: VPP node.
         :param namespace_name: Namespace name.
         :param interface_name: Interface name.
-        :param ip_addr: IP address of namespace's interface.
-        :param prefix: IP address prefix length.
+        :param ip_addr_list: List of IP addresses of namespace's interface.
+        :param prefix_length: IP address prefix length.
         :type node: dict
         :type namespace_name: str
         :type interface_name: str
-        :type ip_addr: str
-        :type prefix: int
+        :type ip_addr_list: list
+        :type prefix_length: int
         """
-        cmd = f"ip netns add {namespace_name}"
-        exec_cmd_no_error(node, cmd, sudo=True)
+        Namespaces.create_namespace(node, namespace_name)
 
-        cmd = f"ip link set dev {interface_name} up netns {namespace_name}"
+        cmd = f"ip netns exec {namespace_name} ip link set {interface_name} up"
         exec_cmd_no_error(node, cmd, sudo=True)
 
-        cmd = f"ip netns exec {namespace_name} ip addr add {ip_addr}/{prefix}" \
-            f" dev {interface_name}"
-        exec_cmd_no_error(node, cmd, sudo=True)
+        for ip_addr in ip_addr_list:
+            cmd = f"ip netns exec {namespace_name} ip addr add " \
+                f"{ip_addr}/{prefix_length} dev {interface_name}"
+            exec_cmd_no_error(node, cmd, sudo=True)
 
     @staticmethod
     def linux_enable_forwarding(node, ip_ver=u"ipv4"):
@@ -351,6 +351,64 @@ class IPUtil:
         exec_cmd_no_error(node, cmd, timeout=5, sudo=True)
 
     @staticmethod
+    def delete_linux_interface_ip(
+            node, interface, ip_addr, prefix_length, namespace=None):
+        """Delete IP address from interface in linux.
+
+        :param node: VPP/TG node.
+        :param interface: Interface in namespace.
+        :param ip_addr: IP to be deleted from interface.
+        :param prefix_length: IP prefix length.
+        :param namespace: Execute command in namespace. Optional
+        :type node: dict
+        :type interface: str
+        :type ip_addr: str
+        :type prefix_length: int
+        :type namespace: str
+        :raises RuntimeError: IP could not be deleted.
+        """
+        # TODO: Refactor command execution in namespaces into central
+        # methods (e.g. Namespace.exec_cmd_in_namespace)
+        if namespace is not None:
+            cmd = f"ip netns exec {namespace} ip addr del " \
+                f"{ip_addr}/{prefix_length} dev {interface}"
+        else:
+            cmd = f"ip addr del {ip_addr}/{prefix_length} dev {interface}"
+
+        exec_cmd_no_error(node, cmd, timeout=5, sudo=True)
+
+    @staticmethod
+    def linux_interface_has_ip(
+            node, interface, ip_addr, prefix_length, namespace=None):
+        """Return True if interface in linux has IP address.
+
+        :param node: VPP/TG node.
+        :param interface: Interface in namespace.
+        :param ip_addr: IP to be queried on interface.
+        :param prefix_length: IP prefix length.
+        :param namespace: Execute command in namespace. Optional
+        :type node: dict
+        :type interface: str
+        :type ip_addr: str
+        :type prefix_length: int
+        :type namespace: str
+        :rtype boolean
+        :raises RuntimeError: Request fails.
+        """
+        ip_addr_with_prefix = f"{ip_addr}/{prefix_length}"
+        if namespace is not None:
+            cmd = f"ip netns exec {namespace} ip addr show dev {interface}"
+        else:
+            cmd = f"ip addr show dev {interface}"
+
+        cmd += u" | grep 'inet ' | awk -e '{print $2}'"
+        cmd += f" | grep '{ip_addr_with_prefix}'"
+        _, stdout, _ = exec_cmd(node, cmd, timeout=5, sudo=True)
+
+        has_ip = stdout.rstrip()
+        return bool(has_ip == ip_addr_with_prefix)
+
+    @staticmethod
     def add_linux_route(node, ip_addr, prefix, gateway, namespace=None):
         """Add linux route in namespace.
 
@@ -406,6 +464,24 @@ class IPUtil:
             papi_exec.add(cmd, **args).get_reply(err_msg)
 
     @staticmethod
+    def vpp_interface_set_ip_addresses(node, interface, ip_addr_list,
+                                       prefix_length=None):
+        """Set IP addresses to VPP interface.
+
+        :param node: VPP node.
+        :param interface: Interface name.
+        :param ip_addr_list: IP addresses.
+        :param prefix_length: Prefix length.
+        :type node: dict
+        :type interface: str
+        :type ip_addr_list: list
+        :type prefix_length: int
+        """
+        for ip_addr in ip_addr_list:
+            IPUtil.vpp_interface_set_ip_address(node, interface, ip_addr,
+                                                prefix_length)
+
+    @staticmethod
     def vpp_add_ip_neighbor(node, iface_key, ip_addr, mac_address):
         """Add IP neighbor on DUT node.
 
diff --git a/resources/libraries/python/Namespaces.py b/resources/libraries/python/Namespaces.py
index 2618f3d19b..2bdcbcb324 100644
--- a/resources/libraries/python/Namespaces.py
+++ b/resources/libraries/python/Namespaces.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -18,21 +18,52 @@ from resources.libraries.python.ssh import exec_cmd_no_error, exec_cmd
 
 class Namespaces:
     """Linux namespace utilities."""
-    def __init__(self):
-        self._namespaces = []
+    __namespaces = []
 
-    def create_namespace(self, node, namespace_name):
+    @staticmethod
+    def create_namespace(node, namespace, delete_before_create=True):
         """Create namespace and add the name to the list for later clean-up.
 
         :param node: Where to create namespace.
-        :param namespace_name: Name for namespace.
+        :param namespace: Name for namespace.
+        :param delete_before_create: Delete namespace prior to create
         :type node: dict
-        :type namespace_name: str
+        :type namespace: str
+        :type delete_before_create: bool
         """
-        cmd = f"ip netns add {namespace_name}"
+        if delete_before_create:
+            Namespaces.delete_namespace(node, namespace)
 
+        cmd = f"ip netns add {namespace}"
         exec_cmd_no_error(node, cmd, sudo=True)
-        self._namespaces.append(namespace_name)
+        Namespaces.__namespaces.append(namespace)
+
+    @staticmethod
+    def delete_namespace(node, namespace):
+        """Delete namespace from the node and list.
+
+        :param node: Where to delete namespace.
+        :param namespace: Name for namespace.
+        :param delete_before_create: Delete namespace prior to create
+        :type node: dict
+        :type namespace: str
+        :type delete_before_create: bool
+        """
+        cmd_timeout = 5
+        cmd = f"ip netns delete {namespace}"
+        (ret_code, _, delete_errmsg) = \
+            exec_cmd(node, cmd, timeout=cmd_timeout, sudo=True)
+        if ret_code != 0:
+            cmd = f"ip netns list {namespace}"
+            (stdout, _) = \
+                exec_cmd_no_error(node, cmd, timeout=cmd_timeout, sudo=True)
+            if stdout == namespace:
+                raise RuntimeError(f"Could not delete namespace "
+                                   f"({namespace}): {delete_errmsg}")
+        try:
+            Namespaces.__namespaces.remove(namespace)
+        except ValueError:
+            pass
 
     @staticmethod
     def attach_interface_to_namespace(node, namespace, interface):
@@ -61,6 +92,21 @@ class Namespaces:
             )
 
     @staticmethod
+    def add_default_route_to_namespace(node, namespace, default_route):
+        """Add IPv4 default route to interface in namespace.
+
+        :param node: Node where to execute command.
+        :param namespace: Namespace to execute command on.
+        :param default_route: Default route address.
+        :type node: dict
+        :type namespace: str
+        :type default_route: str
+        """
+        cmd = f"ip netns exec {namespace} ip route add default " \
+              f"via {default_route}"
+        exec_cmd_no_error(node, cmd, sudo=True)
+
+    @staticmethod
     def create_bridge_for_int_in_namespace(
             node, namespace, bridge_name, *interfaces):
         """Setup bridge domain and add interfaces to it.
@@ -85,16 +131,19 @@ class Namespaces:
         cmd = f"ip netns exec {namespace} ip link set dev {bridge_name} up"
         exec_cmd_no_error(node, cmd, sudo=True)
 
-    def clean_up_namespaces(self, node):
-        """Remove all old namespaces.
+    @staticmethod
+    def clean_up_namespaces(node, namespace=None):
+        """Delete all old namespaces.
 
         :param node: Node where to execute command.
+        :param namespace: Namespace to delete, if None delete all namespaces
         :type node: dict
+        :type namespace: str
         :raises RuntimeError: Namespaces could not be cleaned properly.
         """
-        for namespace in self._namespaces:
-            print(f"Cleaning namespace {namespace}")
-            cmd = f"ip netns delete {namespace}"
-            ret_code, _, _ = exec_cmd(node, cmd, timeout=5, sudo=True)
-            if ret_code != 0:
-                raise RuntimeError(u"Could not delete namespace")
+        if namespace is not None:
+            Namespaces.delete_namespace(node, namespace)
+            return
+
+        for namespace_name in Namespaces.__namespaces:
+            Namespaces.delete_namespace(node, namespace_name)
diff --git a/resources/libraries/python/VPPUtil.py b/resources/libraries/python/VPPUtil.py
index 865775f995..ca63fa6cea 100644
--- a/resources/libraries/python/VPPUtil.py
+++ b/resources/libraries/python/VPPUtil.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -113,8 +113,7 @@ class VPPUtil:
         :param node: Topology node.
         :type node: dict
         """
-        cmd = u"command -v vpp"
-        exec_cmd_no_error(node, cmd, message=u"VPP is not installed!")
+        DUTSetup.verify_program_installed(node, u"vpp")
 
     @staticmethod
     def adjust_privileges(node):
@@ -155,7 +154,7 @@ class VPPUtil:
         :type node: dict
         :raises RuntimeError: If VPP service fails to start.
         """
-        VPPUtil.verify_vpp_installed(node)
+        DUTSetup.verify_program_installed(node, 'vpp')
         try:
             # Verify responsiveness of vppctl.
             VPPUtil.verify_vpp_started(node)
diff --git a/resources/libraries/python/VatExecutor.py b/resources/libraries/python/VatExecutor.py
index 19b92a6a1a..1de32a2a21 100644
--- a/resources/libraries/python/VatExecutor.py
+++ b/resources/libraries/python/VatExecutor.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -62,7 +62,7 @@ def get_vpp_pid(node):
         running on the DUT node.
     :rtype: int or list
     """
-    pid = PidLib.DUTSetup.get_vpp_pid(node)
+    pid = PidLib.DUTSetup.get_pid(node, u"vpp")
     return pid
 
 
diff --git a/resources/libraries/python/VppConfigGenerator.py b/resources/libraries/python/VppConfigGenerator.py
index 02f7cf725d..cd225db896 100644
--- a/resources/libraries/python/VppConfigGenerator.py
+++ b/resources/libraries/python/VppConfigGenerator.py
@@ -202,7 +202,7 @@ class VppConfigGenerator:
 
     def add_socksvr(self, socket=Constants.SOCKSVR_PATH):
         """Add socksvr configuration."""
-        path = ['socksvr', u"socket-name"]
+        path = [u"socksvr", u"socket-name"]
         self.add_config_item(self._nodeconfig, socket, path)
 
     def add_api_segment_gid(self, value=u"vpp"):
@@ -504,6 +504,16 @@ class VppConfigGenerator:
         path = [u"tcp", u"preallocated-half-open-connections"]
         self.add_config_item(self._nodeconfig, value, path)
 
+    def add_session_enable(self):
+        """Add session enable."""
+        path = [u"session", u"enable"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_session_event_queues_memfd_segment(self):
+        """Add session event queue memfd segment."""
+        path = [u"session", u"evt_qs_memfd_seg"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
     def add_session_event_queue_length(self, value):
         """Add session event queue length.
 
@@ -513,6 +523,15 @@ class VppConfigGenerator:
         path = [u"session", u"event-queue-length"]
         self.add_config_item(self._nodeconfig, value, path)
 
+    def add_session_event_queues_segment_size(self, value):
+        """Add session event queue length.
+
+        :param value: Session event queue segment size.
+        :type value: str
+        """
+        path = [u"session", u"evt_qs_seg_size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
     def add_session_preallocated_sessions(self, value):
         """Add the number of pre-allocated sessions.
 
diff --git a/resources/libraries/python/topology.py b/resources/libraries/python/topology.py
index b2d106d3ed..7dec51619c 100644
--- a/resources/libraries/python/topology.py
+++ b/resources/libraries/python/topology.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
 # 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:
@@ -22,6 +22,8 @@ from yaml import safe_load
 from robot.api import logger
 from robot.libraries.BuiltIn import BuiltIn, RobotNotRunningError
 
+from resources.libraries.python.Constants import Constants
+
 __all__ = [
     u"DICT__nodes", u"Topology", u"NodeType", u"SocketType", u"NodeSubTypeTG"
 ]
@@ -705,6 +707,22 @@ class Topology:
             return None
 
     @staticmethod
+    def get_interface_ip4_prefix_length(node, iface_key):
+        """Get IP4 address prefix length for the interface.
+
+        :param node: Node to get prefix length on.
+        :param iface_key: Interface key from topology file.
+        :type node: dict
+        :type iface_key: str
+        :returns: Prefix length from topology file or the default
+            IP4 prefix length if not found.
+        :rtype: int
+        :raises: KeyError if iface_key is not found.
+        """
+        return node[u"interfaces"][iface_key].get(u"ip4_prefix_length", \
+            Constants.DEFAULT_IP4_PREFIX_LENGTH)
+
+    @staticmethod
     def get_adjacent_node_and_interface(nodes_info, node, iface_key):
         """Get node and interface adjacent to specified interface
         on local network.