framework/remote_session/testpmd_shell.py

# SPDX-License-Identifier: BSD-3-Clause
# Copyright(c) 2023 University of New Hampshire
# Copyright(c) 2023 PANTHEON.tech s.r.o.
# Copyright(c) 2024 Arm Limited

"""Testpmd interactive shell.

Typical usage example in a TestSuite::

    testpmd_shell = self.sut_node.create_interactive_shell(
            TestPmdShell, privileged=True
        )
    devices = testpmd_shell.get_devices()
    for device in devices:
        print(device)
    testpmd_shell.close()
"""

import re
import time
from dataclasses import dataclass, field
from enum import Flag, auto
from pathlib import PurePath
from typing import Callable, ClassVar

from typing_extensions import Self

from framework.exception import InteractiveCommandExecutionError
from framework.parser import ParserFn, TextParser
from framework.settings import SETTINGS
from framework.utils import StrEnum

from .interactive_shell import InteractiveShell


class TestPmdDevice:
    """The data of a device that testpmd can recognize.

    Attributes:
        pci_address: The PCI address of the device.
    """

    pci_address: str

    def __init__(self, pci_address_line: str):
        """Initialize the device from the testpmd output line string.

        Args:
            pci_address_line: A line of testpmd output that contains a device.
        """
        self.pci_address = pci_address_line.strip().split(": ")[1].strip()

    def __str__(self) -> str:
        """The PCI address captures what the device is."""
        return self.pci_address


class TestPmdForwardingModes(StrEnum):
    r"""The supported packet forwarding modes for :class:`~TestPmdShell`\s."""

    #:
    io = auto()
    #:
    mac = auto()
    #:
    macswap = auto()
    #:
    flowgen = auto()
    #:
    rxonly = auto()
    #:
    txonly = auto()
    #:
    csum = auto()
    #:
    icmpecho = auto()
    #:
    ieee1588 = auto()
    #:
    noisy = auto()
    #:
    fivetswap = "5tswap"
    #:
    shared_rxq = "shared-rxq"
    #:
    recycle_mbufs = auto()


class VLANOffloadFlag(Flag):
    """Flag representing the VLAN offload settings of a NIC port."""

    #:
    STRIP = auto()
    #:
    FILTER = auto()
    #:
    EXTEND = auto()
    #:
    QINQ_STRIP = auto()

    @classmethod
    def from_str_dict(cls, d):
        """Makes an instance from a dict containing the flag member names with an "on" value.

        Args:
            d: A dictionary containing the flag members as keys and any string value.

        Returns:
            A new instance of the flag.
        """
        flag = cls(0)
        for name in cls.__members__:
            if d.get(name) == "on":
                flag |= cls[name]
        return flag

    @classmethod
    def make_parser(cls) -> ParserFn:
        """Makes a parser function.

        Returns:
            ParserFn: A dictionary for the `dataclasses.field` metadata argument containing a
                parser function that makes an instance of this flag from text.
        """
        return TextParser.wrap(
            TextParser.find(
                r"VLAN offload:\s+"
                r"strip (?P<STRIP>on|off), "
                r"filter (?P<FILTER>on|off), "
                r"extend (?P<EXTEND>on|off), "
                r"qinq strip (?P<QINQ_STRIP>on|off)$",
                re.MULTILINE,
                named=True,
            ),
            cls.from_str_dict,
        )


class RSSOffloadTypesFlag(Flag):
    """Flag representing the RSS offload flow types supported by the NIC port."""

    #:
    ipv4 = auto()
    #:
    ipv4_frag = auto()
    #:
    ipv4_tcp = auto()
    #:
    ipv4_udp = auto()
    #:
    ipv4_sctp = auto()
    #:
    ipv4_other = auto()
    #:
    ipv6 = auto()
    #:
    ipv6_frag = auto()
    #:
    ipv6_tcp = auto()
    #:
    ipv6_udp = auto()
    #:
    ipv6_sctp = auto()
    #:
    ipv6_other = auto()
    #:
    l2_payload = auto()
    #:
    ipv6_ex = auto()
    #:
    ipv6_tcp_ex = auto()
    #:
    ipv6_udp_ex = auto()
    #:
    port = auto()
    #:
    vxlan = auto()
    #:
    geneve = auto()
    #:
    nvgre = auto()
    #:
    user_defined_22 = auto()
    #:
    gtpu = auto()
    #:
    eth = auto()
    #:
    s_vlan = auto()
    #:
    c_vlan = auto()
    #:
    esp = auto()
    #:
    ah = auto()
    #:
    l2tpv3 = auto()
    #:
    pfcp = auto()
    #:
    pppoe = auto()
    #:
    ecpri = auto()
    #:
    mpls = auto()
    #:
    ipv4_chksum = auto()
    #:
    l4_chksum = auto()
    #:
    l2tpv2 = auto()
    #:
    ipv6_flow_label = auto()
    #:
    user_defined_38 = auto()
    #:
    user_defined_39 = auto()
    #:
    user_defined_40 = auto()
    #:
    user_defined_41 = auto()
    #:
    user_defined_42 = auto()
    #:
    user_defined_43 = auto()
    #:
    user_defined_44 = auto()
    #:
    user_defined_45 = auto()
    #:
    user_defined_46 = auto()
    #:
    user_defined_47 = auto()
    #:
    user_defined_48 = auto()
    #:
    user_defined_49 = auto()
    #:
    user_defined_50 = auto()
    #:
    user_defined_51 = auto()
    #:
    l3_pre96 = auto()
    #:
    l3_pre64 = auto()
    #:
    l3_pre56 = auto()
    #:
    l3_pre48 = auto()
    #:
    l3_pre40 = auto()
    #:
    l3_pre32 = auto()
    #:
    l2_dst_only = auto()
    #:
    l2_src_only = auto()
    #:
    l4_dst_only = auto()
    #:
    l4_src_only = auto()
    #:
    l3_dst_only = auto()
    #:
    l3_src_only = auto()

    #:
    ip = ipv4 | ipv4_frag | ipv4_other | ipv6 | ipv6_frag | ipv6_other | ipv6_ex
    #:
    udp = ipv4_udp | ipv6_udp | ipv6_udp_ex
    #:
    tcp = ipv4_tcp | ipv6_tcp | ipv6_tcp_ex
    #:
    sctp = ipv4_sctp | ipv6_sctp
    #:
    tunnel = vxlan | geneve | nvgre
    #:
    vlan = s_vlan | c_vlan
    #:
    all = (
        eth
        | vlan
        | ip
        | tcp
        | udp
        | sctp
        | l2_payload
        | l2tpv3
        | esp
        | ah
        | pfcp
        | gtpu
        | ecpri
        | mpls
        | l2tpv2
    )

    @classmethod
    def from_list_string(cls, names: str) -> Self:
        """Makes a flag from a whitespace-separated list of names.

        Args:
            names: a whitespace-separated list containing the members of this flag.

        Returns:
            An instance of this flag.
        """
        flag = cls(0)
        for name in names.split():
            flag |= cls.from_str(name)
        return flag

    @classmethod
    def from_str(cls, name: str) -> Self:
        """Makes a flag matching the supplied name.

        Args:
            name: a valid member of this flag in text
        Returns:
            An instance of this flag.
        """
        member_name = name.strip().replace("-", "_")
        return cls[member_name]

    @classmethod
    def make_parser(cls) -> ParserFn:
        """Makes a parser function.

        Returns:
            ParserFn: A dictionary for the `dataclasses.field` metadata argument containing a
                parser function that makes an instance of this flag from text.
        """
        return TextParser.wrap(
            TextParser.find(r"Supported RSS offload flow types:((?:\r?\n?  \S+)+)", re.MULTILINE),
            RSSOffloadTypesFlag.from_list_string,
        )


class DeviceCapabilitiesFlag(Flag):
    """Flag representing the device capabilities."""

    #: Device supports Rx queue setup after device started.
    RUNTIME_RX_QUEUE_SETUP = auto()
    #: Device supports Tx queue setup after device started.
    RUNTIME_TX_QUEUE_SETUP = auto()
    #: Device supports shared Rx queue among ports within Rx domain and switch domain.
    RXQ_SHARE = auto()
    #: Device supports keeping flow rules across restart.
    FLOW_RULE_KEEP = auto()
    #: Device supports keeping shared flow objects across restart.
    FLOW_SHARED_OBJECT_KEEP = auto()

    @classmethod
    def make_parser(cls) -> ParserFn:
        """Makes a parser function.

        Returns:
            ParserFn: A dictionary for the `dataclasses.field` metadata argument containing a
                parser function that makes an instance of this flag from text.
        """
        return TextParser.wrap(
            TextParser.find_int(r"Device capabilities: (0x[A-Fa-f\d]+)"),
            cls,
        )


class DeviceErrorHandlingMode(StrEnum):
    """Enum representing the device error handling mode."""

    #:
    none = auto()
    #:
    passive = auto()
    #:
    proactive = auto()
    #:
    unknown = auto()

    @classmethod
    def make_parser(cls) -> ParserFn:
        """Makes a parser function.

        Returns:
            ParserFn: A dictionary for the `dataclasses.field` metadata argument containing a
                parser function that makes an instance of this enum from text.
        """
        return TextParser.wrap(TextParser.find(r"Device error handling mode: (\w+)"), cls)


def make_device_private_info_parser() -> ParserFn:
    """Device private information parser.

    Ensures that we are not parsing invalid device private info output.

    Returns:
        ParserFn: A dictionary for the `dataclasses.field` metadata argument containing a parser
            function that parses the device private info from the TestPmd port info output.
    """

    def _validate(info: str):
        info = info.strip()
        if info == "none" or info.startswith("Invalid file") or info.startswith("Failed to dump"):
            return None
        return info

    return TextParser.wrap(TextParser.find(r"Device private info:\s+([\s\S]+)"), _validate)


@dataclass
class TestPmdPort(TextParser):
    """Dataclass representing the result of testpmd's ``show port info`` command."""

    #:
    id: int = field(metadata=TextParser.find_int(r"Infos for port (\d+)\b"))
    #:
    device_name: str = field(metadata=TextParser.find(r"Device name: ([^\r\n]+)"))
    #:
    driver_name: str = field(metadata=TextParser.find(r"Driver name: ([^\r\n]+)"))
    #:
    socket_id: int = field(metadata=TextParser.find_int(r"Connect to socket: (\d+)"))
    #:
    is_link_up: bool = field(metadata=TextParser.find("Link status: up"))
    #:
    link_speed: str = field(metadata=TextParser.find(r"Link speed: ([^\r\n]+)"))
    #:
    is_link_full_duplex: bool = field(metadata=TextParser.find("Link duplex: full-duplex"))
    #:
    is_link_autonegotiated: bool = field(metadata=TextParser.find("Autoneg status: On"))
    #:
    is_promiscuous_mode_enabled: bool = field(metadata=TextParser.find("Promiscuous mode: enabled"))
    #:
    is_allmulticast_mode_enabled: bool = field(
        metadata=TextParser.find("Allmulticast mode: enabled")
    )
    #: Maximum number of MAC addresses
    max_mac_addresses_num: int = field(
        metadata=TextParser.find_int(r"Maximum number of MAC addresses: (\d+)")
    )
    #: Maximum configurable length of RX packet
    max_hash_mac_addresses_num: int = field(
        metadata=TextParser.find_int(r"Maximum number of MAC addresses of hash filtering: (\d+)")
    )
    #: Minimum size of RX buffer
    min_rx_bufsize: int = field(metadata=TextParser.find_int(r"Minimum size of RX buffer: (\d+)"))
    #: Maximum configurable length of RX packet
    max_rx_packet_length: int = field(
        metadata=TextParser.find_int(r"Maximum configurable length of RX packet: (\d+)")
    )
    #: Maximum configurable size of LRO aggregated packet
    max_lro_packet_size: int = field(
        metadata=TextParser.find_int(r"Maximum configurable size of LRO aggregated packet: (\d+)")
    )

    #: Current number of RX queues
    rx_queues_num: int = field(metadata=TextParser.find_int(r"Current number of RX queues: (\d+)"))
    #: Max possible RX queues
    max_rx_queues_num: int = field(metadata=TextParser.find_int(r"Max possible RX queues: (\d+)"))
    #: Max possible number of RXDs per queue
    max_queue_rxd_num: int = field(
        metadata=TextParser.find_int(r"Max possible number of RXDs per queue: (\d+)")
    )
    #: Min possible number of RXDs per queue
    min_queue_rxd_num: int = field(
        metadata=TextParser.find_int(r"Min possible number of RXDs per queue: (\d+)")
    )
    #: RXDs number alignment
    rxd_alignment_num: int = field(metadata=TextParser.find_int(r"RXDs number alignment: (\d+)"))

    #: Current number of TX queues
    tx_queues_num: int = field(metadata=TextParser.find_int(r"Current number of TX queues: (\d+)"))
    #: Max possible TX queues
    max_tx_queues_num: int = field(metadata=TextParser.find_int(r"Max possible TX queues: (\d+)"))
    #: Max possible number of TXDs per queue
    max_queue_txd_num: int = field(
        metadata=TextParser.find_int(r"Max possible number of TXDs per queue: (\d+)")
    )
    #: Min possible number of TXDs per queue
    min_queue_txd_num: int = field(
        metadata=TextParser.find_int(r"Min possible number of TXDs per queue: (\d+)")
    )
    #: TXDs number alignment
    txd_alignment_num: int = field(metadata=TextParser.find_int(r"TXDs number alignment: (\d+)"))
    #: Max segment number per packet
    max_packet_segment_num: int = field(
        metadata=TextParser.find_int(r"Max segment number per packet: (\d+)")
    )
    #: Max segment number per MTU/TSO
    max_mtu_segment_num: int = field(
        metadata=TextParser.find_int(r"Max segment number per MTU\/TSO: (\d+)")
    )

    #:
    device_capabilities: DeviceCapabilitiesFlag = field(
        metadata=DeviceCapabilitiesFlag.make_parser(),
    )
    #:
    device_error_handling_mode: DeviceErrorHandlingMode = field(
        metadata=DeviceErrorHandlingMode.make_parser()
    )
    #:
    device_private_info: str | None = field(
        default=None,
        metadata=make_device_private_info_parser(),
    )

    #:
    hash_key_size: int | None = field(
        default=None, metadata=TextParser.find_int(r"Hash key size in bytes: (\d+)")
    )
    #:
    redirection_table_size: int | None = field(
        default=None, metadata=TextParser.find_int(r"Redirection table size: (\d+)")
    )
    #:
    supported_rss_offload_flow_types: RSSOffloadTypesFlag = field(
        default=RSSOffloadTypesFlag(0), metadata=RSSOffloadTypesFlag.make_parser()
    )

    #:
    mac_address: str | None = field(
        default=None, metadata=TextParser.find(r"MAC address: ([A-Fa-f0-9:]+)")
    )
    #:
    fw_version: str | None = field(
        default=None, metadata=TextParser.find(r"Firmware-version: ([^\r\n]+)")
    )
    #:
    dev_args: str | None = field(default=None, metadata=TextParser.find(r"Devargs: ([^\r\n]+)"))
    #: Socket id of the memory allocation
    mem_alloc_socket_id: int | None = field(
        default=None,
        metadata=TextParser.find_int(r"memory allocation on the socket: (\d+)"),
    )
    #:
    mtu: int | None = field(default=None, metadata=TextParser.find_int(r"MTU: (\d+)"))

    #:
    vlan_offload: VLANOffloadFlag | None = field(
        default=None,
        metadata=VLANOffloadFlag.make_parser(),
    )

    #: Maximum size of RX buffer
    max_rx_bufsize: int | None = field(
        default=None, metadata=TextParser.find_int(r"Maximum size of RX buffer: (\d+)")
    )
    #: Maximum number of VFs
    max_vfs_num: int | None = field(
        default=None, metadata=TextParser.find_int(r"Maximum number of VFs: (\d+)")
    )
    #: Maximum number of VMDq pools
    max_vmdq_pools_num: int | None = field(
        default=None, metadata=TextParser.find_int(r"Maximum number of VMDq pools: (\d+)")
    )

    #:
    switch_name: str | None = field(
        default=None, metadata=TextParser.find(r"Switch name: ([\r\n]+)")
    )
    #:
    switch_domain_id: int | None = field(
        default=None, metadata=TextParser.find_int(r"Switch domain Id: (\d+)")
    )
    #:
    switch_port_id: int | None = field(
        default=None, metadata=TextParser.find_int(r"Switch Port Id: (\d+)")
    )
    #:
    switch_rx_domain: int | None = field(
        default=None, metadata=TextParser.find_int(r"Switch Rx domain: (\d+)")
    )


@dataclass
class TestPmdPortStats(TextParser):
    """Port statistics."""

    #:
    port_id: int = field(metadata=TextParser.find_int(r"NIC statistics for port (\d+)"))

    #:
    rx_packets: int = field(metadata=TextParser.find_int(r"RX-packets:\s+(\d+)"))
    #:
    rx_missed: int = field(metadata=TextParser.find_int(r"RX-missed:\s+(\d+)"))
    #:
    rx_bytes: int = field(metadata=TextParser.find_int(r"RX-bytes:\s+(\d+)"))
    #:
    rx_errors: int = field(metadata=TextParser.find_int(r"RX-errors:\s+(\d+)"))
    #:
    rx_nombuf: int = field(metadata=TextParser.find_int(r"RX-nombuf:\s+(\d+)"))

    #:
    tx_packets: int = field(metadata=TextParser.find_int(r"TX-packets:\s+(\d+)"))
    #:
    tx_errors: int = field(metadata=TextParser.find_int(r"TX-errors:\s+(\d+)"))
    #:
    tx_bytes: int = field(metadata=TextParser.find_int(r"TX-bytes:\s+(\d+)"))

    #:
    rx_pps: int = field(metadata=TextParser.find_int(r"Rx-pps:\s+(\d+)"))
    #:
    rx_bps: int = field(metadata=TextParser.find_int(r"Rx-bps:\s+(\d+)"))

    #:
    tx_pps: int = field(metadata=TextParser.find_int(r"Tx-pps:\s+(\d+)"))
    #:
    tx_bps: int = field(metadata=TextParser.find_int(r"Tx-bps:\s+(\d+)"))


class TestPmdShell(InteractiveShell):
    """Testpmd interactive shell.

    The testpmd shell users should never use
    the :meth:`~.interactive_shell.InteractiveShell.send_command` method directly, but rather
    call specialized methods. If there isn't one that satisfies a need, it should be added.

    Attributes:
        number_of_ports: The number of ports which were allowed on the command-line when testpmd
            was started.
    """

    number_of_ports: int

    #: The path to the testpmd executable.
    path: ClassVar[PurePath] = PurePath("app", "dpdk-testpmd")

    #: Flag this as a DPDK app so that it's clear this is not a system app and
    #: needs to be looked in a specific path.
    dpdk_app: ClassVar[bool] = True

    #: The testpmd's prompt.
    _default_prompt: ClassVar[str] = "testpmd>"

    #: This forces the prompt to appear after sending a command.
    _command_extra_chars: ClassVar[str] = "\n"

    def _start_application(self, get_privileged_command: Callable[[str], str] | None) -> None:
        """Overrides :meth:`~.interactive_shell._start_application`.

        Add flags for starting testpmd in interactive mode and disabling messages for link state
        change events before starting the application. Link state is verified before starting
        packet forwarding and the messages create unexpected newlines in the terminal which
        complicates output collection.

        Also find the number of pci addresses which were allowed on the command line when the app
        was started.
        """
        self._app_args += " -i --mask-event intr_lsc"
        self.number_of_ports = self._app_args.count("-a ")
        super()._start_application(get_privileged_command)

    def start(self, verify: bool = True) -> None:
        """Start packet forwarding with the current configuration.

        Args:
            verify: If :data:`True` , a second start command will be sent in an attempt to verify
                packet forwarding started as expected.

        Raises:
            InteractiveCommandExecutionError: If `verify` is :data:`True` and forwarding fails to
                start or ports fail to come up.
        """
        self.send_command("start")
        if verify:
            # If forwarding was already started, sending "start" again should tell us
            start_cmd_output = self.send_command("start")
            if "Packet forwarding already started" not in start_cmd_output:
                self._logger.debug(f"Failed to start packet forwarding: \n{start_cmd_output}")
                raise InteractiveCommandExecutionError("Testpmd failed to start packet forwarding.")

            for port_id in range(self.number_of_ports):
                if not self.wait_link_status_up(port_id):
                    raise InteractiveCommandExecutionError(
                        "Not all ports came up after starting packet forwarding in testpmd."
                    )

    def stop(self, verify: bool = True) -> None:
        """Stop packet forwarding.

        Args:
            verify: If :data:`True` , the output of the stop command is scanned to verify that
                forwarding was stopped successfully or not started. If neither is found, it is
                considered an error.

        Raises:
            InteractiveCommandExecutionError: If `verify` is :data:`True` and the command to stop
                forwarding results in an error.
        """
        stop_cmd_output = self.send_command("stop")
        if verify:
            if (
                "Done." not in stop_cmd_output
                and "Packet forwarding not started" not in stop_cmd_output
            ):
                self._logger.debug(f"Failed to stop packet forwarding: \n{stop_cmd_output}")
                raise InteractiveCommandExecutionError("Testpmd failed to stop packet forwarding.")

    def get_devices(self) -> list[TestPmdDevice]:
        """Get a list of device names that are known to testpmd.

        Uses the device info listed in testpmd and then parses the output.

        Returns:
            A list of devices.
        """
        dev_info: str = self.send_command("show device info all")
        dev_list: list[TestPmdDevice] = []
        for line in dev_info.split("\n"):
            if "device name:" in line.lower():
                dev_list.append(TestPmdDevice(line))
        return dev_list

    def wait_link_status_up(self, port_id: int, timeout=SETTINGS.timeout) -> bool:
        """Wait until the link status on the given port is "up".

        Arguments:
            port_id: Port to check the link status on.
            timeout: Time to wait for the link to come up. The default value for this
                argument may be modified using the :option:`--timeout` command-line argument
                or the :envvar:`DTS_TIMEOUT` environment variable.

        Returns:
            Whether the link came up in time or not.
        """
        time_to_stop = time.time() + timeout
        port_info: str = ""
        while time.time() < time_to_stop:
            port_info = self.send_command(f"show port info {port_id}")
            if "Link status: up" in port_info:
                break
            time.sleep(0.5)
        else:
            self._logger.error(f"The link for port {port_id} did not come up in the given timeout.")
        return "Link status: up" in port_info

    def set_forward_mode(self, mode: TestPmdForwardingModes, verify: bool = True):
        """Set packet forwarding mode.

        Args:
            mode: The forwarding mode to use.
            verify: If :data:`True` the output of the command will be scanned in an attempt to
                verify that the forwarding mode was set to `mode` properly.

        Raises:
            InteractiveCommandExecutionError: If `verify` is :data:`True` and the forwarding mode
                fails to update.
        """
        set_fwd_output = self.send_command(f"set fwd {mode.value}")
        if f"Set {mode.value} packet forwarding mode" not in set_fwd_output:
            self._logger.debug(f"Failed to set fwd mode to {mode.value}:\n{set_fwd_output}")
            raise InteractiveCommandExecutionError(
                f"Test pmd failed to set fwd mode to {mode.value}"
            )

    def show_port_info_all(self) -> list[TestPmdPort]:
        """Returns the information of all the ports.

        Returns:
            list[TestPmdPort]: A list containing all the ports information as `TestPmdPort`.
        """
        output = self.send_command("show port info all")

        # Sample output of the "all" command looks like:
        #
        # <start>
        #
        #   ********************* Infos for port 0 *********************
        #   Key: value
        #
        #   ********************* Infos for port 1 *********************
        #   Key: value
        # <end>
        #
        # Takes advantage of the double new line in between ports as end delimiter. But we need to
        # artificially add a new line at the end to pick up the last port. Because commands are
        # executed on a pseudo-terminal created by paramiko on the remote node, lines end with CRLF.
        # Therefore we also need to take the carriage return into account.
        iter = re.finditer(r"\*{21}.*?[\r\n]{4}", output + "\r\n", re.S)
        return [TestPmdPort.parse(block.group(0)) for block in iter]

    def show_port_info(self, port_id: int) -> TestPmdPort:
        """Returns the given port information.

        Args:
            port_id: The port ID to gather information for.

        Raises:
            InteractiveCommandExecutionError: If `port_id` is invalid.

        Returns:
            TestPmdPort: An instance of `TestPmdPort` containing the given port's information.
        """
        output = self.send_command(f"show port info {port_id}", skip_first_line=True)
        if output.startswith("Invalid port"):
            raise InteractiveCommandExecutionError("invalid port given")

        return TestPmdPort.parse(output)

    def show_port_stats_all(self) -> list[TestPmdPortStats]:
        """Returns the statistics of all the ports.

        Returns:
            list[TestPmdPortStats]: A list containing all the ports stats as `TestPmdPortStats`.
        """
        output = self.send_command("show port stats all")

        # Sample output of the "all" command looks like:
        #
        #   ########### NIC statistics for port 0 ###########
        #   values...
        #   #################################################
        #
        #   ########### NIC statistics for port 1 ###########
        #   values...
        #   #################################################
        #
        iter = re.finditer(r"(^  #*.+#*$[^#]+)^  #*\r$", output, re.MULTILINE)
        return [TestPmdPortStats.parse(block.group(1)) for block in iter]

    def show_port_stats(self, port_id: int) -> TestPmdPortStats:
        """Returns the given port statistics.

        Args:
            port_id: The port ID to gather information for.

        Raises:
            InteractiveCommandExecutionError: If `port_id` is invalid.

        Returns:
            TestPmdPortStats: An instance of `TestPmdPortStats` containing the given port's stats.
        """
        output = self.send_command(f"show port stats {port_id}", skip_first_line=True)
        if output.startswith("Invalid port"):
            raise InteractiveCommandExecutionError("invalid port given")

        return TestPmdPortStats.parse(output)

    def close(self) -> None:
        """Overrides :meth:`~.interactive_shell.close`."""
        self.send_command("quit", "")
        return super().close()