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All new inbound code contributions to the Project must be made
using the Apache License, Version 2.0
(available here: https://www.apache.org/licenses/LICENSE-2.0)
(the “Project License”).

All new inbound code contributions must also be accompanied
by a Developer Certificate of Origin (http://developercertificate.org)
sign-off in the source code system that is submitted through
a TSC-approved contribution process which will bind the authorized contributor
and, if not self-employed, their employer to the applicable license;

All outbound code will be made available under the Project License.

Documentation will be received and made available by the Project
under the Creative Commons Attribution 4.0 International License
(available at http://creativecommons.org/licenses/by/4.0/).

The Project may seek to integrate and contribute back to other
open source projects (“Upstream Projects”). In such cases,
the Project will conform to all license requirements of the Upstream Projects,
including dependencies, leveraged by the Project. Upstream Project
code contributions not stored within the Project’s main code repository
will comply with the contribution process and license terms
for the applicable Upstream Project.
# Copyright (c) 2023 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.

"""VPP Configuration File Generator library."""

import re

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

__all__ = ["VppConfigGenerator", "VppInitConfig"]


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


class VppConfigGenerator:
    """VPP Configuration File Generator."""

    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 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 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:
            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="/var/log/vpp/vpp.log"):
        """Add UNIX log configuration.

        :param value: Log file.
        :type value: str
        """
        path = [u"unix", u"log"]
        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_ipsec_spd_flow_cache_ipv4_inbound(self, value):
        """Add IPsec spd flow cache for IP4 inbound.

        :param value: "on" to enable spd flow cache.
        :type value: str
        """
        path = [u"ipsec", u"ipv4-inbound-spd-flow-cache"]
        self.add_config_item(self._nodeconfig, value, path)

    def add_ipsec_spd_flow_cache_ipv4_outbound(self, value):
        """Add IPsec spd flow cache for IP4 outbound.

        :param value: "on" to enable spd flow cache.
        :type value: str
        """
        path = [u"ipsec", u"ipv4-outbound-spd-flow-cache"]
        self.add_config_item(self._nodeconfig, value, path)

    def add_ipsec_spd_fast_path_ipv4_inbound(self, value):
        """Add IPsec spd fast path for IP4 inbound.

        :param value: "on" to enable spd fast path.
        :type value: str
        """
        path = [u"ipsec", u"ipv4-inbound-spd-fast-path"]
        self.add_config_item(self._nodeconfig, value, path)

    def add_ipsec_spd_fast_path_ipv4_outbound(self, value):
        """Add IPsec spd fast path for IP4 outbound.

        :param value: "on" to enable spd fast path.
        :type value: str
        """
        path = [u"ipsec", u"ipv4-outbound-spd-fast-path"]
        self.add_config_item(self._nodeconfig, value, path)

    def add_ipsec_spd_fast_path_num_buckets(self, value):
        """Add num buckets for IPsec spd fast path.

        :param value: Number of buckets.
        :type value: int
        """
        path = [u"ipsec", u"spd-fast-path-num-buckets"]
        self.add_config_item(self._nodeconfig, value, 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_app_socket_api(self):
        """Use session app socket api."""
        path = [u"session", u"use-app-socket-api"]
        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 topology node.

        :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)


class VppInitConfig:
    """VPP Initial Configuration."""
    @staticmethod
    def init_vpp_startup_configuration_on_all_duts(nodes):
        """Apply initial VPP startup configuration on all DUTs.

        :param nodes: Nodes in the topology.
        :type nodes: dict
        """
        huge_size = Constants.DEFAULT_HUGEPAGE_SIZE
        for node in nodes.values():
            if node[u"type"] == NodeType.DUT:
                vpp_config = VppConfigGenerator()
                vpp_config.set_node(node)
                vpp_config.add_unix_log()
                vpp_config.add_unix_cli_listen()
                vpp_config.add_unix_cli_no_pager()
                vpp_config.add_unix_gid()
                vpp_config.add_unix_coredump()
                vpp_config.add_socksvr(socket=Constants.SOCKSVR_PATH)
                vpp_config.add_main_heap_size("2G")
                vpp_config.add_main_heap_page_size(huge_size)
                vpp_config.add_default_hugepage_size(huge_size)
                vpp_config.add_statseg_size("2G")
                vpp_config.add_statseg_page_size(huge_size)
                vpp_config.add_statseg_per_node_counters("on")
                vpp_config.add_plugin("disable", "default")
                vpp_config.add_plugin("enable", "dpdk_plugin.so")
                vpp_config.add_dpdk_dev(
                    *[node["interfaces"][interface].get("pci_address") \
                        for interface in node[u"interfaces"]]
                )
                vpp_config.add_ip6_hash_buckets(2000000)
                vpp_config.add_ip6_heap_size("4G")
                vpp_config.apply_config()