X-Git-Url: https://gerrit.fd.io/r/gitweb?p=csit.git;a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FVppConfigGenerator.py;h=e1830147d8662e60c7d1ee05842befeada58a8f4;hp=6085882e8e01cf2611b2536377a38d31a6861bc8;hb=b6606e7625e308a66bdfb9d5a9c065b58e429a99;hpb=c1bdb7115f12e7d4ec586ec0673fd19dce3a2414

diff --git a/resources/libraries/python/VppConfigGenerator.py b/resources/libraries/python/VppConfigGenerator.py
index 6085882e8e..e1830147d8 100644
--- a/resources/libraries/python/VppConfigGenerator.py
+++ b/resources/libraries/python/VppConfigGenerator.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2016 Cisco and/or its affiliates.
+# Copyright (c) 2022 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:
@@ -11,362 +11,655 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""VPP Configuration File Generator library"""
+"""VPP Configuration File Generator library."""
 
-from robot.api import logger
+import re
 
-from resources.libraries.python.ssh import SSH
+from resources.libraries.python.Constants import Constants
+from resources.libraries.python.ssh import exec_cmd_no_error
 from resources.libraries.python.topology import NodeType
 from resources.libraries.python.topology import Topology
+from resources.libraries.python.VPPUtil import VPPUtil
 
-import re
-import time
+__all__ = [u"VppConfigGenerator"]
 
-__all__ = ['VppConfigGenerator']
 
-#
-# VPP configuration template.
-# TODO: Do we need a better place for this? Somewhere in an external
-# (template) file?
-# Note: We're going to pass this through Python string Formatter, so
-# any literal curly braces need to be escaped.
-#
-VPP_SERVICE_NAME = "vpp"
-VPP_CONFIG_FILENAME = "/etc/vpp/startup.conf"
-DEFAULT_SOCKETMEM_CONFIG = "1024,1024"
-VPP_CONFIG_TEMPLATE = """
-unix {{
-  nodaemon
-  log /tmp/vpe.log
-  cli-listen localhost:5002
-  full-coredump
-}}
-
-api-trace {{
-  on
-}}
-{heapsizeconfig}
-cpu {{
-{cpuconfig}
-}}
-
-dpdk {{
-  socket-mem {socketmemconfig}
-{pciconfig}
-{rssconfig}
-}}
-"""
-# End VPP configuration template.
-
-
-class VppConfigGenerator(object):
-    """VPP Configuration File Generator"""
+def pci_dev_check(pci_dev):
+    """Check if provided PCI address is in correct format.
+
+    :param pci_dev: PCI address (expected format: xxxx:xx:xx.x).
+    :type pci_dev: str
+    :returns: True if PCI address is in correct format.
+    :rtype: bool
+    :raises ValueError: If PCI address is in incorrect format.
+    """
+    pattern = re.compile(
+        r"^[0-9A-Fa-f]{4}:[0-9A-Fa-f]{2}:[0-9A-Fa-f]{2}\.[0-9A-Fa-f]$"
+    )
+    if not re.match(pattern, pci_dev):
+        raise ValueError(
+            f"PCI address {pci_dev} is not in valid format xxxx:xx:xx.x"
+        )
+    return True
 
-    def __init__(self):
-        self._nodeconfig = {}
 
-    def add_pci_device(self, node, pci_device=None):
-        """Add PCI device configuration for node.
+class VppConfigGenerator:
+    """VPP Configuration File Generator."""
 
-        :param node: DUT node
-        :param pci_device: PCI device (format 0000:00:00.0 or 00:00.0).
-        If none given, all PCI devices for this node as per topology will be
-        added.
+    def __init__(self):
+        """Initialize library."""
+        # VPP Node to apply configuration on
+        self._node = u""
+        # Topology node key
+        self._node_key = u""
+        # VPP Configuration
+        self._nodeconfig = dict()
+        # Serialized VPP Configuration
+        self._vpp_config = u""
+        # VPP Service name
+        self._vpp_service_name = u"vpp"
+        # VPP Logfile location
+        self._vpp_logfile = u"/tmp/vpe.log"
+        # VPP Startup config location
+        self._vpp_startup_conf = u"/etc/vpp/startup.conf"
+
+    def set_node(self, node, node_key=None):
+        """Set DUT node.
+
+        :param node: Node to store configuration on.
+        :param node_key: Topology node key.
         :type node: dict
-        :type pci_device: string
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-
-        if pci_device is None:
-            # No PCI device was given. Add all device from topology.
-            for port in node['interfaces'].values():
-                port_name = port.get('name')
-                pci_addr = Topology.get_interface_pci_addr(node, port_name)
-                if pci_addr:
-                    self.add_pci_device(node, pci_addr)
+        :type node_key: str
+        :raises RuntimeError: If Node type is not DUT.
+        """
+        if node[u"type"] != NodeType.DUT:
+            raise RuntimeError(
+                u"Startup config can only be applied to DUTnode."
+            )
+        self._node = node
+        self._node_key = node_key
+
+    def get_config_str(self):
+        """Get dumped startup configuration in VPP config format.
+
+        :returns: Startup configuration in VPP config format.
+        :rtype: str
+        """
+        self.dump_config(self._nodeconfig)
+        return self._vpp_config
+
+    def add_config_item(self, config, value, path):
+        """Add startup configuration item.
+
+        :param config: Startup configuration of node.
+        :param value: Value to insert.
+        :param path: Path where to insert item.
+        :type config: dict
+        :type value: str
+        :type path: list
+        """
+        if len(path) == 1:
+            config[path[0]] = value
+            return
+        if path[0] not in config:
+            config[path[0]] = dict()
+        elif isinstance(config[path[0]], str):
+            config[path[0]] = dict() if config[path[0]] == u"" \
+                else {config[path[0]]: u""}
+        self.add_config_item(config[path[0]], value, path[1:])
+
+    def dump_config(self, obj, level=-1):
+        """Dump the startup configuration in VPP config format.
+
+        :param obj: Python Object to print.
+        :param level: Nested level for indentation.
+        :type obj: Obj
+        :type level: int
+        :returns: nothing
+        """
+        indent = u"  "
+        if level >= 0:
+            self._vpp_config += f"{level * indent}{{\n"
+        if isinstance(obj, dict):
+            for key, val in obj.items():
+                if hasattr(val, u"__iter__") and not isinstance(val, str):
+                    self._vpp_config += f"{(level + 1) * indent}{key}\n"
+                    self.dump_config(val, level + 1)
+                else:
+                    self._vpp_config += f"{(level + 1) * indent}{key} {val}\n"
         else:
-            # Specific device was given.
-            hostname = Topology.get_node_hostname(node)
-
-            pattern = re.compile("^[0-9A-Fa-f]{4}:[0-9A-Fa-f]{2}:"\
-                "[0-9A-Fa-f]{2}\\.[0-9A-Fa-f]$")
-            if not pattern.match(pci_device):
-                raise ValueError('PCI address {} to be added to host {} '\
-                    'is not in valid format xxxx:xx:xx.x'.\
-                    format(pci_device, hostname))
-
-            if not hostname in self._nodeconfig:
-                self._nodeconfig[hostname] = {}
-            if not 'pci_addrs' in self._nodeconfig[hostname]:
-                self._nodeconfig[hostname]['pci_addrs'] = []
-            self._nodeconfig[hostname]['pci_addrs'].append(pci_device)
-            logger.debug('Adding PCI device {1} to {0}'.format(hostname,\
-               pci_device))
-
-    def add_cpu_config(self, node, cpu_config):
-        """Add CPU configuration for node.
-
-        :param node: DUT node
-        :param cpu_config: CPU configuration option, as a string
-        :type node: dict
-        :type cpu_config: string
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if not hostname in self._nodeconfig:
-            self._nodeconfig[hostname] = {}
-        if not 'cpu_config' in self._nodeconfig[hostname]:
-            self._nodeconfig[hostname]['cpu_config'] = []
-        self._nodeconfig[hostname]['cpu_config'].append(cpu_config)
-        logger.debug('Adding {} to hostname {} CPU config'.format(hostname, \
-            cpu_config))
-
-    def add_socketmem_config(self, node, socketmem_config):
-        """Add Socket Memory configuration for node.
-
-        :param node: DUT node
-        :param socketmem_config: Socket Memory configuration option, as a string
-        :type node: dict
-        :type cpu_config: string
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if not hostname in self._nodeconfig:
-            self._nodeconfig[hostname] = {}
-        self._nodeconfig[hostname]['socketmem_config'] = socketmem_config
-        logger.debug('Setting hostname {} Socket Memory config to {}'.\
-            format(hostname, socketmem_config))
-
-    def add_heapsize_config(self, node, heapsize_config):
-        """Add Heap Size configuration for node.
-
-        :param node: DUT node
-        :param heapsize_config: Heap Size configuration, as a string
-        :type node: dict
-        :type cpu_config: string
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if not hostname in self._nodeconfig:
-            self._nodeconfig[hostname] = {}
-        self._nodeconfig[hostname]['heapsize_config'] = heapsize_config
-        logger.debug('Setting hostname {} Heap Size config to {}'.\
-            format(hostname, heapsize_config))
-
-    def add_rss_config(self, node, rss_config):
-        """Add RSS configuration for node.
-
-        :param node: DUT node
-        :param rss_config: RSS configuration, as a string
-        :type node: dict
-        :type rss_config: string
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if not hostname in self._nodeconfig:
-            self._nodeconfig[hostname] = {}
-        if not 'rss_config' in self._nodeconfig[hostname]:
-            self._nodeconfig[hostname]['rss_config'] = []
-        self._nodeconfig[hostname]['rss_config'].append(rss_config)
-        logger.debug('Setting hostname {} RSS config to {}'.\
-            format(hostname, rss_config))
-
-    def remove_all_pci_devices(self, node):
-        """Remove PCI device configuration from node.
-
-        :param node: DUT node
-        :type: node: dict
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if hostname in self._nodeconfig:
-            self._nodeconfig[hostname]['pci_addrs'] = []
-        logger.debug('Clearing all PCI devices for hostname {}.'.\
-            format(hostname))
-
-    def remove_all_cpu_config(self, node):
-        """Remove CPU configuration from node.
-
-        :param node: DUT node
-        :type: node: dict
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if hostname in self._nodeconfig:
-            self._nodeconfig[hostname]['cpu_config'] = []
-        logger.debug('Clearing all CPU config for hostname {}.'.\
-            format(hostname))
-
-    def remove_socketmem_config(self, node):
-        """Remove Socket Memory configuration from node.
-
-        :param node: DUT node
-        :type: node: dict
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if hostname in self._nodeconfig:
-            self._nodeconfig[hostname].pop('socketmem_config', None)
-        logger.debug('Clearing Socket Memory config for hostname {}.'.\
-            format(hostname))
-
-    def remove_heapsize_config(self, node):
-        """Remove Heap Size configuration from node.
-
-        :param node: DUT node
-        :type: node: dict
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if hostname in self._nodeconfig:
-            self._nodeconfig[hostname].pop('heapsize_config', None)
-        logger.debug('Clearing Heap Size config for hostname {}.'.\
-            format(hostname))
-
-    def remove_rss_config(self, node):
-        """Remove RSS configuration from node.
-
-        :param node: DUT node
-        :type: node: dict
-        :return: nothing
-        """
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-        if hostname in self._nodeconfig:
-            self._nodeconfig[hostname]['rss_config'] = []
-        logger.debug('Clearing RSS config for hostname {}.'.\
-            format(hostname))
-
-    def apply_config(self, node, waittime=5, retries=12):
-        """Generate and apply VPP configuration for node.
+            for val in obj:
+                self._vpp_config += f"{(level + 1) * indent}{val}\n"
+        if level >= 0:
+            self._vpp_config += f"{level * indent}}}\n"
+
+    def add_unix_log(self, value=None):
+        """Add UNIX log configuration.
+
+        :param value: Log file.
+        :type value: str
+        """
+        path = [u"unix", u"log"]
+        if value is None:
+            value = self._vpp_logfile
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_unix_cli_listen(self, value=u"/run/vpp/cli.sock"):
+        """Add UNIX cli-listen configuration.
+
+        :param value: CLI listen address and port or path to CLI socket.
+        :type value: str
+        """
+        path = [u"unix", u"cli-listen"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_unix_cli_no_pager(self):
+        """Add UNIX cli-no-pager configuration."""
+        path = [u"unix", u"cli-no-pager"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_unix_gid(self, value=u"vpp"):
+        """Add UNIX gid configuration.
+
+        :param value: Gid.
+        :type value: str
+        """
+        path = [u"unix", u"gid"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_unix_nodaemon(self):
+        """Add UNIX nodaemon configuration."""
+        path = [u"unix", u"nodaemon"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_unix_coredump(self):
+        """Add UNIX full-coredump configuration."""
+        path = [u"unix", u"full-coredump"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_unix_exec(self, value):
+        """Add UNIX exec configuration."""
+        path = [u"unix", u"exec"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_socksvr(self, socket=Constants.SOCKSVR_PATH):
+        """Add socksvr configuration."""
+        path = [u"socksvr", u"socket-name"]
+        self.add_config_item(self._nodeconfig, socket, path)
+
+    def add_graph_node_variant(self, variant=Constants.GRAPH_NODE_VARIANT):
+        """Add default graph node variant.
+
+        :param value: Graph node variant default value.
+        :type value: str
+        """
+        if variant == u"":
+            return
+        variant_list = [u"hsw", u"skx", u"icl"]
+        if variant not in variant_list:
+            raise ValueError("Invalid graph node variant value")
+        path = [u"node", u"default", u"variant"]
+        self.add_config_item(self._nodeconfig, variant, path)
+
+    def add_api_segment_gid(self, value=u"vpp"):
+        """Add API-SEGMENT gid configuration.
+
+        :param value: Gid.
+        :type value: str
+        """
+        path = [u"api-segment", u"gid"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_api_segment_global_size(self, value):
+        """Add API-SEGMENT global-size configuration.
+
+        :param value: Global size.
+        :type value: str
+        """
+        path = [u"api-segment", u"global-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_api_segment_api_size(self, value):
+        """Add API-SEGMENT api-size configuration.
+
+        :param value: API size.
+        :type value: str
+        """
+        path = [u"api-segment", u"api-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_buffers_per_numa(self, value):
+        """Increase number of buffers allocated.
+
+        :param value: Number of buffers allocated.
+        :type value: int
+        """
+        path = [u"buffers", u"buffers-per-numa"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_buffers_default_data_size(self, value):
+        """Increase buffers data-size allocated.
+
+        :param value: Buffers data-size allocated.
+        :type value: int
+        """
+        path = [u"buffers", u"default data-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_dpdk_dev(self, *devices):
+        """Add DPDK PCI device configuration.
+
+        :param devices: PCI device(s) (format xxxx:xx:xx.x)
+        :type devices: tuple
+        """
+        for device in devices:
+            if pci_dev_check(device):
+                path = [u"dpdk", f"dev {device}"]
+                self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_dpdk_cryptodev(self, count):
+        """Add DPDK Crypto PCI device configuration.
+
+        :param count: Number of HW crypto devices to add.
+        :type count: int
+        """
+        cryptodev = Topology.get_cryptodev(self._node)
+        for i in range(count):
+            cryptodev_config = re.sub(r"\d.\d$", f"1.{str(i)}", cryptodev)
+            path = [u"dpdk", f"dev {cryptodev_config}"]
+            self.add_config_item(self._nodeconfig, u"", path)
+        self.add_dpdk_uio_driver(u"vfio-pci")
+
+    def add_dpdk_sw_cryptodev(self, sw_pmd_type, socket_id, count):
+        """Add DPDK SW Crypto device configuration.
+
+        :param sw_pmd_type: Type of SW crypto device PMD to add.
+        :param socket_id: Socket ID.
+        :param count: Number of SW crypto devices to add.
+        :type sw_pmd_type: str
+        :type socket_id: int
+        :type count: int
+        """
+        for _ in range(count):
+            cryptodev_config = f"vdev cryptodev_{sw_pmd_type}_pmd," \
+                f"socket_id={str(socket_id)}"
+            path = [u"dpdk", cryptodev_config]
+            self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_dpdk_dev_default_rxq(self, value):
+        """Add DPDK dev default rxq configuration.
+
+        :param value: Default number of rxqs.
+        :type value: str
+        """
+        path = [u"dpdk", u"dev default", u"num-rx-queues"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_dpdk_dev_default_txq(self, value):
+        """Add DPDK dev default txq configuration.
+
+        :param value: Default number of txqs.
+        :type value: str
+        """
+        path = [u"dpdk", u"dev default", u"num-tx-queues"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_dpdk_dev_default_rxd(self, value):
+        """Add DPDK dev default rxd configuration.
+
+        :param value: Default number of rxds.
+        :type value: str
+        """
+        path = [u"dpdk", u"dev default", u"num-rx-desc"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_dpdk_dev_default_txd(self, value):
+        """Add DPDK dev default txd configuration.
+
+        :param value: Default number of txds.
+        :type value: str
+        """
+        path = [u"dpdk", u"dev default", u"num-tx-desc"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_dpdk_log_level(self, value):
+        """Add DPDK log-level configuration.
+
+        :param value: Log level.
+        :type value: str
+        """
+        path = [u"dpdk", u"log-level"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_dpdk_no_pci(self):
+        """Add DPDK no-pci."""
+        path = [u"dpdk", u"no-pci"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_dpdk_uio_driver(self, value=None):
+        """Add DPDK uio-driver configuration.
+
+        :param value: DPDK uio-driver configuration. By default, driver will be
+            loaded automatically from Topology file, still leaving option
+            to manually override by parameter.
+        :type value: str
+        """
+        if value is None:
+            value = Topology.get_uio_driver(self._node)
+        path = [u"dpdk", u"uio-driver"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_dpdk_max_simd_bitwidth(self, variant=Constants.GRAPH_NODE_VARIANT):
+        """Add DPDK max-simd-bitwidth configuration.
+
+        :param value: Graph node variant default value.
+        :type value: str
+        """
+        if variant == u"icl":
+            value = 512
+        elif variant in [u"skx", u"hsw"]:
+            value = 256
+        else:
+            return
+
+        path = [u"dpdk", u"max-simd-bitwidth"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_cpu_main_core(self, value):
+        """Add CPU main core configuration.
+
+        :param value: Main core option.
+        :type value: str
+        """
+        path = [u"cpu", u"main-core"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_cpu_corelist_workers(self, value):
+        """Add CPU corelist-workers configuration.
+
+        :param value: Corelist-workers option.
+        :type value: str
+        """
+        path = [u"cpu", u"corelist-workers"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_main_heap_size(self, value):
+        """Add Main Heap Size configuration.
+
+        :param value: Amount of heap.
+        :type value: str
+        """
+        path = [u"memory", u"main-heap-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_main_heap_page_size(self, value):
+        """Add Main Heap Page Size configuration.
+
+        :param value: Heap page size.
+        :type value: str
+        """
+        path = [u"memory", u"main-heap-page-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_default_hugepage_size(self, value=Constants.DEFAULT_HUGEPAGE_SIZE):
+        """Add Default Hugepage Size configuration.
+
+        :param value: Hugepage size.
+        :type value: str
+        """
+        path = [u"memory", u"default-hugepage-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_api_trace(self):
+        """Add API trace configuration."""
+        path = [u"api-trace", u"on"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_ip6_hash_buckets(self, value):
+        """Add IP6 hash buckets configuration.
+
+        :param value: Number of IP6 hash buckets.
+        :type value: str
+        """
+        path = [u"ip6", u"hash-buckets"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_ip6_heap_size(self, value):
+        """Add IP6 heap-size configuration.
+
+        :param value: IP6 Heapsize amount.
+        :type value: str
+        """
+        path = [u"ip6", u"heap-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_spd_flow_cache_ipv4_outbound(self):
+        """Add SPD flow cache for IP4 outbound traffic"""
+        path = [u"ipsec", u"ipv4-outbound-spd-flow-cache"]
+        self.add_config_item(self._nodeconfig, "on", path)
+
+    def add_statseg_size(self, value):
+        """Add Stats Heap Size configuration.
+
+        :param value: Stats heapsize amount.
+        :type value: str
+        """
+        path = [u"statseg", u"size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_statseg_page_size(self, value):
+        """Add Stats Heap Page Size configuration.
+
+        :param value: Stats heapsize amount.
+        :type value: str
+        """
+        path = [u"statseg", u"page-size"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_statseg_per_node_counters(self, value):
+        """Add stats per-node-counters configuration.
+
+        :param value: "on" to switch the counters on.
+        :type value: str
+        """
+        path = [u"statseg", u"per-node-counters"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_plugin(self, state, *plugins):
+        """Add plugin section for specific plugin(s).
+
+        :param state: State of plugin [enable|disable].
+        :param plugins: Plugin(s) to disable.
+        :type state: str
+        :type plugins: list
+        """
+        for plugin in plugins:
+            path = [u"plugins", f"plugin {plugin}", state]
+            self.add_config_item(self._nodeconfig, u" ", path)
+
+    def add_dpdk_no_multi_seg(self):
+        """Add DPDK no-multi-seg configuration."""
+        path = [u"dpdk", u"no-multi-seg"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_dpdk_no_tx_checksum_offload(self):
+        """Add DPDK no-tx-checksum-offload configuration."""
+        path = [u"dpdk", u"no-tx-checksum-offload"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_nat(self, value=u"deterministic"):
+        """Add NAT mode configuration.
+
+        :param value: NAT mode.
+        :type value: str
+        """
+        path = [u"nat", value]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_nat_max_translations_per_thread(self, value):
+        """Add NAT max. translations per thread number configuration.
+
+        :param value: NAT mode.
+        :type value: str
+        """
+        path = [u"nat", u"max translations per thread"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_nsim_poll_main_thread(self):
+        """Add NSIM poll-main-thread configuration."""
+        path = [u"nsim", u"poll-main-thread"]
+        self.add_config_item(self._nodeconfig, u"", path)
+
+    def add_tcp_congestion_control_algorithm(self, value=u"cubic"):
+        """Add TCP congestion control algorithm.
+
+        :param value: The congestion control algorithm to use. Example: cubic
+        :type value: str
+        """
+        path = [u"tcp", u"cc-algo"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_tcp_preallocated_connections(self, value):
+        """Add TCP pre-allocated connections.
+
+        :param value: The number of pre-allocated connections.
+        :type value: int
+        """
+        path = [u"tcp", u"preallocated-connections"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_tcp_preallocated_half_open_connections(self, value):
+        """Add TCP pre-allocated half open connections.
+
+        :param value: The number of pre-allocated half open connections.
+        :type value: int
+        """
+        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.
+
+        :param value: Session event queue length.
+        :type value: int
+        """
+        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.
+
+        :param value: Number of pre-allocated sessions.
+        :type value: int
+        """
+        path = [u"session", u"preallocated-sessions"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_session_v4_session_table_buckets(self, value):
+        """Add number of v4 session table buckets to the config.
+
+        :param value: Number of v4 session table buckets.
+        :type value: int
+        """
+        path = [u"session", u"v4-session-table-buckets"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_session_v4_session_table_memory(self, value):
+        """Add the size of v4 session table memory.
+
+        :param value: Size of v4 session table memory.
+        :type value: str
+        """
+        path = [u"session", u"v4-session-table-memory"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_session_v4_halfopen_table_buckets(self, value):
+        """Add the number of v4 halfopen table buckets.
+
+        :param value: Number of v4 halfopen table buckets.
+        :type value: int
+        """
+        path = [u"session", u"v4-halfopen-table-buckets"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_session_v4_halfopen_table_memory(self, value):
+        """Add the size of v4 halfopen table memory.
+
+        :param value: Size of v4 halfopen table memory.
+        :type value: str
+        """
+        path = [u"session", u"v4-halfopen-table-memory"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_session_local_endpoints_table_buckets(self, value):
+        """Add the number of local endpoints table buckets.
+
+        :param value: Number of local endpoints table buckets.
+        :type value: int
+        """
+        path = [u"session", u"local-endpoints-table-buckets"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def add_session_local_endpoints_table_memory(self, value):
+        """Add the size of local endpoints table memory.
+
+        :param value: Size of local endpoints table memory.
+        :type value: str
+        """
+        path = [u"session", u"local-endpoints-table-memory"]
+        self.add_config_item(self._nodeconfig, value, path)
+
+    def write_config(self, filename=None):
+        """Generate and write VPP startup configuration to file.
 
         Use data from calls to this class to form a startup.conf file and
-        replace /etc/vpp/startup.conf with it on node.
+        replace /etc/vpp/startup.conf with it on topology node.
 
-        :param node: DUT node
-        :param waittime: time to wait for VPP to restart (default 5 seconds)
-        :param retries: number of times (default 12) to re-try waiting
-        :type node: dict
-        :type waittime: int
-        :type retries: int
-        """
-
-        if node['type'] != NodeType.DUT:
-            raise ValueError('Node type is not a DUT')
-        hostname = Topology.get_node_hostname(node)
-
-        cpuconfig = ""
-        pciconfig = ""
-        socketmemconfig = DEFAULT_SOCKETMEM_CONFIG
-        heapsizeconfig = ""
-        rssconfig = ""
-
-        if hostname in self._nodeconfig:
-            cfg = self._nodeconfig[hostname]
-            if 'cpu_config' in cfg:
-                cpuconfig = "  " + "\n  ".join(cfg['cpu_config'])
-
-            if 'pci_addrs' in cfg:
-                pciconfig = "  dev " + "\n  dev ".join(cfg['pci_addrs'])
-
-            if 'socketmem_config' in cfg:
-                socketmemconfig = cfg['socketmem_config']
-
-            if 'heapsize_config' in cfg:
-                heapsizeconfig = "\nheapsize {}\n".\
-                    format(cfg['heapsize_config'])
-
-            if 'rss_config' in cfg:
-                rssconfig = "  " + "\n  ".join(cfg['rss_config'])
-
-        vppconfig = VPP_CONFIG_TEMPLATE.format(cpuconfig=cpuconfig,
-                                               pciconfig=pciconfig,
-                                               socketmemconfig=socketmemconfig,
-                                               heapsizeconfig=heapsizeconfig,
-                                               rssconfig=rssconfig)
-
-        logger.debug('Writing VPP config to host {}: "{}"'.format(hostname,\
-               vppconfig))
-
-        ssh = SSH()
-        ssh.connect(node)
-
-        # We're using this "| sudo tee" construct because redirecting
-        # a sudo'd outut ("sudo echo xxx > /path/to/file") does not
-        # work on most platforms...
-        (ret, stdout, stderr) = \
-            ssh.exec_command('echo "{0}" | sudo tee {1}'.\
-            format(vppconfig, VPP_CONFIG_FILENAME))
-
-        if ret != 0:
-            logger.debug('Writing config file failed to node {}'.\
-                format(hostname))
-            logger.debug('stdout: {}'.format(stdout))
-            logger.debug('stderr: {}'.format(stderr))
-            raise RuntimeError('Writing config file failed to node {}'.\
-                format(hostname))
-
-        # Instead of restarting, we'll do separate start and stop
-        # actions. This way we don't care whether VPP was running
-        # to begin with.
-        ssh.exec_command('sudo initctl stop {}'.format(VPP_SERVICE_NAME))
-        (ret, stdout, stderr) = \
-            ssh.exec_command('sudo initctl start {}'.format(VPP_SERVICE_NAME))
-        if ret != 0:
-            logger.debug('Restarting VPP failed on node {}'.\
-                format(hostname))
-            logger.debug('stdout: {}'.format(stdout))
-            logger.debug('stderr: {}'.format(stderr))
-            raise RuntimeError('Restarting VPP failed on node {}'.\
-                format(hostname))
-
-        # Sleep <waittime> seconds, up to <retry> times,
-        # and verify if VPP is running.
-        vpp_is_running = False
-        retries_left = retries
-        while (not vpp_is_running) and (retries_left > 0):
-            time.sleep(waittime)
-            retries_left -= 1
-
-            # FIXME: Need to find a good way to check if VPP is operational.
-            #
-            # If VatTerminal/VatExecutor is anything like vppctl or
-            # vpp_api_test, then in case VPP is NOT running it will block for
-            # 30 seconds or so and not even return if VPP becomes alive during
-            # that time. This makes it unsuitable in this case. We either need
-            # a call that returns immediately, indicating whether VPP is
-            # healthy or not, or a call that waits (up to a defined length
-            # of time) and returns immediately if VPP is or becomes healthy.
-            (ret, stdout, stderr) = \
-                ssh.exec_command('echo show hardware-interfaces | '\
-                    'nc 0 5002')
-
-            if ret == 0:
-                vpp_is_running = True
-            else:
-                logger.debug('VPP not yet running, {} retries left'.\
-                    format(retries_left))
-        if retries_left == 0:
-            raise RuntimeError('VPP failed to restart on node {}'.\
-                format(hostname))
-        logger.debug('VPP interfaces found on node {}'.\
-           format(stdout))
+        :param filename: Startup configuration file name.
+        :type filename: str
+        """
+        self.dump_config(self._nodeconfig)
+
+        if filename is None:
+            filename = self._vpp_startup_conf
+
+        cmd = f"echo \"{self._vpp_config}\" | sudo tee {filename}"
+        exec_cmd_no_error(
+            self._node, cmd, message=u"Writing config file failed!"
+        )
+
+    def apply_config(self, filename=None, verify_vpp=True):
+        """Generate and write VPP startup configuration to file and restart VPP.
+
+        Use data from calls to this class to form a startup.conf file and
+        replace /etc/vpp/startup.conf with it on topology node.
+
+        :param filename: Startup configuration file name.
+        :param verify_vpp: Verify VPP is running after restart.
+        :type filename: str
+        :type verify_vpp: bool
+        """
+        self.write_config(filename=filename)
+
+        VPPUtil.restart_vpp_service(self._node, self._node_key)
+        if verify_vpp:
+            VPPUtil.verify_vpp(self._node)