On Thu, Nov 23, 2023 at 10:14 AM Juraj Linkeš <juraj.lin...@pantheon.tech>
wrote:
> Format according to the Google format and PEP257, with slight
> deviations.
>
> Signed-off-by: Juraj Linkeš <juraj.lin...@pantheon.tech>
> ---
> dts/framework/testbed_model/sut_node.py | 230 ++++++++++++++++--------
> dts/framework/testbed_model/tg_node.py | 42 +++--
> 2 files changed, 176 insertions(+), 96 deletions(-)
>
> diff --git a/dts/framework/testbed_model/sut_node.py
> b/dts/framework/testbed_model/sut_node.py
> index 5ce9446dba..c4acea38d1 100644
> --- a/dts/framework/testbed_model/sut_node.py
> +++ b/dts/framework/testbed_model/sut_node.py
> @@ -3,6 +3,14 @@
> # Copyright(c) 2023 PANTHEON.tech s.r.o.
> # Copyright(c) 2023 University of New Hampshire
>
> +"""System under test (DPDK + hardware) node.
> +
> +A system under test (SUT) is the combination of DPDK
> +and the hardware we're testing with DPDK (NICs, crypto and other devices).
> +An SUT node is where this SUT runs.
> +"""
>
I think this should just be "A SUT node"
> +
> +
> import os
> import tarfile
> import time
> @@ -26,6 +34,11 @@
>
>
> class EalParameters(object):
> + """The environment abstraction layer parameters.
> +
> + The string representation can be created by converting the instance
> to a string.
> + """
> +
> def __init__(
> self,
> lcore_list: LogicalCoreList,
> @@ -35,21 +48,23 @@ def __init__(
> vdevs: list[VirtualDevice],
> other_eal_param: str,
> ):
> - """
> - Generate eal parameters character string;
> - :param lcore_list: the list of logical cores to use.
> - :param memory_channels: the number of memory channels to use.
> - :param prefix: set file prefix string, eg:
> - prefix='vf'
> - :param no_pci: switch of disable PCI bus eg:
> - no_pci=True
> - :param vdevs: virtual device list, eg:
> - vdevs=[
> - VirtualDevice('net_ring0'),
> - VirtualDevice('net_ring1')
> - ]
> - :param other_eal_param: user defined DPDK eal parameters, eg:
> - other_eal_param='--single-file-segments'
> + """Initialize the parameters according to inputs.
> +
> + Process the parameters into the format used on the command line.
> +
> + Args:
> + lcore_list: The list of logical cores to use.
> + memory_channels: The number of memory channels to use.
> + prefix: Set the file prefix string with which to start DPDK,
> e.g.: ``prefix='vf'``.
> + no_pci: Switch to disable PCI bus e.g.: ``no_pci=True``.
> + vdevs: Virtual devices, e.g.::
> +
> + vdevs=[
> + VirtualDevice('net_ring0'),
> + VirtualDevice('net_ring1')
> + ]
> + other_eal_param: user defined DPDK EAL parameters, e.g.:
> + ``other_eal_param='--single-file-segments'``
> """
> self._lcore_list = f"-l {lcore_list}"
> self._memory_channels = f"-n {memory_channels}"
> @@ -61,6 +76,7 @@ def __init__(
> self._other_eal_param = other_eal_param
>
> def __str__(self) -> str:
> + """Create the EAL string."""
> return (
> f"{self._lcore_list} "
> f"{self._memory_channels} "
> @@ -72,11 +88,21 @@ def __str__(self) -> str:
>
>
> class SutNode(Node):
> - """
> - A class for managing connections to the System under Test, providing
> - methods that retrieve the necessary information about the node (such
> as
> - CPU, memory and NIC details) and configuration capabilities.
> - Another key capability is building DPDK according to given build
> target.
> + """The system under test node.
> +
> + The SUT node extends :class:`Node` with DPDK specific features:
> +
> + * DPDK build,
> + * Gathering of DPDK build info,
> + * The running of DPDK apps, interactively or one-time execution,
> + * DPDK apps cleanup.
> +
> + The :option:`--tarball` command line argument and the
> :envvar:`DTS_DPDK_TARBALL`
> + environment variable configure the path to the DPDK tarball
> + or the git commit ID, tag ID or tree ID to test.
> +
> + Attributes:
> + config: The SUT node configuration
> """
>
> config: SutNodeConfiguration
> @@ -94,6 +120,11 @@ class SutNode(Node):
> _path_to_devbind_script: PurePath | None
>
> def __init__(self, node_config: SutNodeConfiguration):
> + """Extend the constructor with SUT node specifics.
> +
> + Args:
> + node_config: The SUT node's test run configuration.
> + """
> super(SutNode, self).__init__(node_config)
> self._dpdk_prefix_list = []
> self._build_target_config = None
> @@ -113,6 +144,12 @@ def __init__(self, node_config: SutNodeConfiguration):
>
> @property
> def _remote_dpdk_dir(self) -> PurePath:
> + """The remote DPDK dir.
> +
> + This internal property should be set after extracting the DPDK
> tarball. If it's not set,
> + that implies the DPDK setup step has been skipped, in which case
> we can guess where
> + a previous build was located.
> + """
> if self.__remote_dpdk_dir is None:
> self.__remote_dpdk_dir = self._guess_dpdk_remote_dir()
> return self.__remote_dpdk_dir
> @@ -123,6 +160,11 @@ def _remote_dpdk_dir(self, value: PurePath) -> None:
>
> @property
> def remote_dpdk_build_dir(self) -> PurePath:
> + """The remote DPDK build directory.
> +
> + This is the directory where DPDK was built.
> + We assume it was built in a subdirectory of the extracted tarball.
> + """
> if self._build_target_config:
> return self.main_session.join_remote_path(
> self._remote_dpdk_dir, self._build_target_config.name
> @@ -132,18 +174,21 @@ def remote_dpdk_build_dir(self) -> PurePath:
>
> @property
> def dpdk_version(self) -> str:
> + """Last built DPDK version."""
> if self._dpdk_version is None:
> self._dpdk_version =
> self.main_session.get_dpdk_version(self._remote_dpdk_dir)
> return self._dpdk_version
>
> @property
> def node_info(self) -> NodeInfo:
> + """Additional node information."""
> if self._node_info is None:
> self._node_info = self.main_session.get_node_info()
> return self._node_info
>
> @property
> def compiler_version(self) -> str:
> + """The node's compiler version."""
> if self._compiler_version is None:
> if self._build_target_config is not None:
> self._compiler_version =
> self.main_session.get_compiler_version(
> @@ -158,6 +203,7 @@ def compiler_version(self) -> str:
>
> @property
> def path_to_devbind_script(self) -> PurePath:
> + """The path to the dpdk-devbind.py script on the node."""
> if self._path_to_devbind_script is None:
> self._path_to_devbind_script =
> self.main_session.join_remote_path(
> self._remote_dpdk_dir, "usertools", "dpdk-devbind.py"
> @@ -165,6 +211,11 @@ def path_to_devbind_script(self) -> PurePath:
> return self._path_to_devbind_script
>
> def get_build_target_info(self) -> BuildTargetInfo:
> + """Get additional build target information.
> +
> + Returns:
> + The build target information,
> + """
> return BuildTargetInfo(
> dpdk_version=self.dpdk_version,
> compiler_version=self.compiler_version
> )
> @@ -173,8 +224,9 @@ def _guess_dpdk_remote_dir(self) -> PurePath:
> return
> self.main_session.guess_dpdk_remote_dir(self._remote_tmp_dir)
>
> def _set_up_build_target(self, build_target_config:
> BuildTargetConfiguration) -> None:
> - """
> - Setup DPDK on the SUT node.
> + """Setup DPDK on the SUT node.
> +
> + Additional build target setup steps on top of those in
> :class:`Node`.
> """
> # we want to ensure that dpdk_version and compiler_version is
> reset for new
> # build targets
> @@ -186,16 +238,14 @@ def _set_up_build_target(self, build_target_config:
> BuildTargetConfiguration) ->
> self.bind_ports_to_driver()
>
> def _tear_down_build_target(self) -> None:
> - """
> - This method exists to be optionally overwritten by derived
> classes and
> - is not decorated so that the derived class doesn't have to use
> the decorator.
> + """Bind ports to the operating system drivers.
> +
> + Additional build target teardown steps on top of those in
> :class:`Node`.
> """
> self.bind_ports_to_driver(for_dpdk=False)
>
> def _configure_build_target(self, build_target_config:
> BuildTargetConfiguration) -> None:
> - """
> - Populate common environment variables and set build target config.
> - """
> + """Populate common environment variables and set build target
> config."""
> self._env_vars = {}
> self._build_target_config = build_target_config
>
>
> self._env_vars.update(self.main_session.get_dpdk_build_env_vars(build_target_config.arch))
> @@ -207,9 +257,7 @@ def _configure_build_target(self, build_target_config:
> BuildTargetConfiguration)
>
> @Node.skip_setup
> def _copy_dpdk_tarball(self) -> None:
> - """
> - Copy to and extract DPDK tarball on the SUT node.
> - """
> + """Copy to and extract DPDK tarball on the SUT node."""
> self._logger.info("Copying DPDK tarball to SUT.")
> self.main_session.copy_to(SETTINGS.dpdk_tarball_path,
> self._remote_tmp_dir)
>
> @@ -238,8 +286,9 @@ def _copy_dpdk_tarball(self) -> None:
>
> @Node.skip_setup
> def _build_dpdk(self) -> None:
> - """
> - Build DPDK. Uses the already configured target. Assumes that the
> tarball has
> + """Build DPDK.
> +
> + Uses the already configured target. Assumes that the tarball has
> already been copied to and extracted on the SUT node.
> """
> self.main_session.build_dpdk(
> @@ -250,15 +299,19 @@ def _build_dpdk(self) -> None:
> )
>
> def build_dpdk_app(self, app_name: str, **meson_dpdk_args: str |
> bool) -> PurePath:
> - """
> - Build one or all DPDK apps. Requires DPDK to be already built on
> the SUT node.
> - When app_name is 'all', build all example apps.
> - When app_name is any other string, tries to build that example
> app.
> - Return the directory path of the built app. If building all apps,
> return
> - the path to the examples directory (where all apps reside).
> - The meson_dpdk_args are keyword arguments
> - found in meson_option.txt in root DPDK directory. Do not use -D
> with them,
> - for example: enable_kmods=True.
> + """Build one or all DPDK apps.
> +
> + Requires DPDK to be already built on the SUT node.
> +
> + Args:
> + app_name: The name of the DPDK app to build.
> + When `app_name` is ``all``, build all example apps.
> + meson_dpdk_args: The arguments found in ``meson_options.txt``
> in root DPDK directory.
> + Do not use ``-D`` with them.
> +
> + Returns:
> + The directory path of the built app. If building all apps,
> return
> + the path to the examples directory (where all apps reside).
> """
> self.main_session.build_dpdk(
> self._env_vars,
> @@ -277,9 +330,7 @@ def build_dpdk_app(self, app_name: str,
> **meson_dpdk_args: str | bool) -> PurePa
> )
>
> def kill_cleanup_dpdk_apps(self) -> None:
> - """
> - Kill all dpdk applications on the SUT. Cleanup hugepages.
> - """
> + """Kill all dpdk applications on the SUT, then clean up
> hugepages."""
> if self._dpdk_kill_session and self._dpdk_kill_session.is_alive():
> # we can use the session if it exists and responds
>
> self._dpdk_kill_session.kill_cleanup_dpdk_apps(self._dpdk_prefix_list)
> @@ -298,33 +349,34 @@ def create_eal_parameters(
> vdevs: list[VirtualDevice] | None = None,
> other_eal_param: str = "",
> ) -> "EalParameters":
> - """
> - Generate eal parameters character string;
> - :param lcore_filter_specifier: a number of lcores/cores/sockets
> to use
> - or a list of lcore ids to use.
> - The default will select one lcore for each of two
> cores
> - on one socket, in ascending order of core ids.
> - :param ascending_cores: True, use cores with the lowest numerical
> id first
> - and continue in ascending order. If False, start
> with the
> - highest id and continue in descending order. This
> ordering
> - affects which sockets to consider first as well.
> - :param prefix: set file prefix string, eg:
> - prefix='vf'
> - :param append_prefix_timestamp: if True, will append a timestamp
> to
> - DPDK file prefix.
> - :param no_pci: switch of disable PCI bus eg:
> - no_pci=True
> - :param vdevs: virtual device list, eg:
> - vdevs=[
> - VirtualDevice('net_ring0'),
> - VirtualDevice('net_ring1')
> - ]
> - :param other_eal_param: user defined DPDK eal parameters, eg:
> - other_eal_param='--single-file-segments'
> - :return: eal param string, eg:
> - '-c 0xf -a 0000:88:00.0
> --file-prefix=dpdk_1112_20190809143420';
> - """
> + """Compose the EAL parameters.
> +
> + Process the list of cores and the DPDK prefix and pass that along
> with
> + the rest of the arguments.
>
> + Args:
> + lcore_filter_specifier: A number of lcores/cores/sockets to
> use
> + or a list of lcore ids to use.
> + The default will select one lcore for each of two cores
> + on one socket, in ascending order of core ids.
> + ascending_cores: Sort cores in ascending order (lowest to
> highest IDs).
> + If :data:`False`, sort in descending order.
> + prefix: Set the file prefix string with which to start DPDK,
> e.g.: ``prefix='vf'``.
> + append_prefix_timestamp: If :data:`True`, will append a
> timestamp to DPDK file prefix.
> + no_pci: Switch to disable PCI bus e.g.: ``no_pci=True``.
> + vdevs: Virtual devices, e.g.::
> +
> + vdevs=[
> + VirtualDevice('net_ring0'),
> + VirtualDevice('net_ring1')
> + ]
> + other_eal_param: user defined DPDK EAL parameters, e.g.:
> + ``other_eal_param='--single-file-segments'``.
> +
> + Returns:
> + An EAL param string, such as
> + ``-c 0xf -a 0000:88:00.0
> --file-prefix=dpdk_1112_20190809143420``.
> + """
> lcore_list =
> LogicalCoreList(self.filter_lcores(lcore_filter_specifier, ascending_cores))
>
> if append_prefix_timestamp:
> @@ -348,14 +400,29 @@ def create_eal_parameters(
> def run_dpdk_app(
> self, app_path: PurePath, eal_args: "EalParameters", timeout:
> float = 30
> ) -> CommandResult:
> - """
> - Run DPDK application on the remote node.
> + """Run DPDK application on the remote node.
> +
> + The application is not run interactively - the command that
> starts the application
> + is executed and then the call waits for it to finish execution.
> +
> + Args:
> + app_path: The remote path to the DPDK application.
> + eal_args: EAL parameters to run the DPDK application with.
> + timeout: Wait at most this long in seconds for `command`
> execution to complete.
> +
> + Returns:
> + The result of the DPDK app execution.
> """
> return self.main_session.send_command(
> f"{app_path} {eal_args}", timeout, privileged=True,
> verify=True
> )
>
> def configure_ipv4_forwarding(self, enable: bool) -> None:
> + """Enable/disable IPv4 forwarding on the node.
> +
> + Args:
> + enable: If :data:`True`, enable the forwarding, otherwise
> disable it.
> + """
> self.main_session.configure_ipv4_forwarding(enable)
>
> def create_interactive_shell(
> @@ -365,9 +432,13 @@ def create_interactive_shell(
> privileged: bool = False,
> eal_parameters: EalParameters | str | None = None,
> ) -> InteractiveShellType:
> - """Factory method for creating a handler for an interactive
> session.
> + """Extend the factory for interactive session handlers.
> +
> + The extensions are SUT node specific:
>
> - Instantiate shell_cls according to the remote OS specifics.
> + * The default for `eal_parameters`,
> + * The interactive shell path `shell_cls.path` is prepended
> with path to the remote
> + DPDK build directory for DPDK apps.
>
> Args:
> shell_cls: The class of the shell.
> @@ -377,9 +448,10 @@ def create_interactive_shell(
> privileged: Whether to run the shell with administrative
> privileges.
> eal_parameters: List of EAL parameters to use to launch the
> app. If this
> isn't provided or an empty string is passed, it will
> default to calling
> - create_eal_parameters().
> + :meth:`create_eal_parameters`.
> +
> Returns:
> - Instance of the desired interactive application.
> + An instance of the desired interactive application shell.
> """
> if not eal_parameters:
> eal_parameters = self.create_eal_parameters()
> @@ -396,8 +468,8 @@ def bind_ports_to_driver(self, for_dpdk: bool = True)
> -> None:
> """Bind all ports on the SUT to a driver.
>
> Args:
> - for_dpdk: Boolean that, when True, binds ports to
> os_driver_for_dpdk
> - or, when False, binds to os_driver. Defaults to True.
> + for_dpdk: If :data:`True`, binds ports to os_driver_for_dpdk.
> + If :data:`False`, binds to os_driver.
> """
> for port in self.ports:
> driver = port.os_driver_for_dpdk if for_dpdk else
> port.os_driver
> diff --git a/dts/framework/testbed_model/tg_node.py
> b/dts/framework/testbed_model/tg_node.py
> index 8a8f0019f3..f269d4c585 100644
> --- a/dts/framework/testbed_model/tg_node.py
> +++ b/dts/framework/testbed_model/tg_node.py
> @@ -5,13 +5,8 @@
>
> """Traffic generator node.
>
> -This is the node where the traffic generator resides.
> -The distinction between a node and a traffic generator is as follows:
> -A node is a host that DTS connects to. It could be a baremetal server,
> -a VM or a container.
> -A traffic generator is software running on the node.
> -A traffic generator node is a node running a traffic generator.
> -A node can be a traffic generator node as well as system under test node.
> +A traffic generator (TG) generates traffic that's sent towards the SUT
> node.
> +A TG node is where the TG runs.
> """
>
> from scapy.packet import Packet # type: ignore[import]
> @@ -24,13 +19,16 @@
>
>
> class TGNode(Node):
> - """Manage connections to a node with a traffic generator.
> + """The traffic generator node.
>
> - Apart from basic node management capabilities, the Traffic Generator
> node has
> - specialized methods for handling the traffic generator running on it.
> + The TG node extends :class:`Node` with TG specific features:
>
> - Arguments:
> - node_config: The user configuration of the traffic generator node.
> + * Traffic generator initialization,
> + * The sending of traffic and receiving packets,
> + * The sending of traffic without receiving packets.
> +
> + Not all traffic generators are capable of capturing traffic, which is
> why there
> + must be a way to send traffic without that.
>
> Attributes:
> traffic_generator: The traffic generator running on the node.
> @@ -39,6 +37,13 @@ class TGNode(Node):
> traffic_generator: CapturingTrafficGenerator
>
> def __init__(self, node_config: TGNodeConfiguration):
> + """Extend the constructor with TG node specifics.
> +
> + Initialize the traffic generator on the TG node.
> +
> + Args:
> + node_config: The TG node's test run configuration.
> + """
> super(TGNode, self).__init__(node_config)
> self.traffic_generator = create_traffic_generator(self,
> node_config.traffic_generator)
> self._logger.info(f"Created node: {self.name}")
> @@ -50,17 +55,17 @@ def send_packet_and_capture(
> receive_port: Port,
> duration: float = 1,
> ) -> list[Packet]:
> - """Send a packet, return received traffic.
> + """Send `packet`, return received traffic.
>
> - Send a packet on the send_port and then return all traffic
> captured
> - on the receive_port for the given duration. Also record the
> captured traffic
> + Send `packet` on `send_port` and then return all traffic captured
> + on `receive_port` for the given duration. Also record the
> captured traffic
> in a pcap file.
>
> Args:
> packet: The packet to send.
> send_port: The egress port on the TG node.
> receive_port: The ingress port in the TG node.
> - duration: Capture traffic for this amount of time after
> sending the packet.
> + duration: Capture traffic for this amount of time after
> sending `packet`.
>
> Returns:
> A list of received packets. May be empty if no packets are
> captured.
> @@ -70,6 +75,9 @@ def send_packet_and_capture(
> )
>
> def close(self) -> None:
> - """Free all resources used by the node"""
> + """Free all resources used by the node.
> +
> + This extends the superclass method with TG cleanup.
> + """
> self.traffic_generator.close()
> super(TGNode, self).close()
> --
> 2.34.1
>
>
