On Wed, Nov 22, 2023 at 2:13 PM Yoan Picchi <yoan.pic...@foss.arm.com> wrote:
>
> On 11/15/23 13:09, Juraj Linkeš 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 | 224 ++++++++++++++++--------
> > dts/framework/testbed_model/tg_node.py | 42 +++--
> > 2 files changed, 173 insertions(+), 93 deletions(-)
> >
> > diff --git a/dts/framework/testbed_model/sut_node.py
> > b/dts/framework/testbed_model/sut_node.py
> > index 17deea06e2..123b16fee0 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.
> > +"""
> > +
> > +
> > 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.
>
> I just want to make sure. We use the --tarball option also to set a git
> commit id instead of a tarball as the source?
>
Yes. The purpose of the option is to specify the DPDK to test and
there are different accepted formats for the option (a tarball or a
git commit id). There are actually three aliases for the option:
--tarball, --snapshot, --git-ref, but none of the aliases capture the
dichotomous nature of the option.
> > +
> > + 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
> > @@ -132,6 +174,7 @@ 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
> > @@ -140,12 +183,14 @@ def dpdk_version(self) -> str:
> >
> > @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(
> > @@ -161,6 +206,7 @@ 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"
> > @@ -168,6 +214,11 @@ 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
> > )
> > @@ -178,8 +229,9 @@ def _guess_dpdk_remote_dir(self) -> PurePath:
> > 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
> > @@ -200,9 +252,7 @@ def _tear_down_build_target(self) -> None:
> > 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(
> > @@ -217,9 +267,7 @@ def _configure_build_target(
> >
> > @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)
> >
> > @@ -250,8 +298,9 @@ 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(
> > @@ -262,15 +311,19 @@ 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,
> > @@ -291,9 +344,7 @@ 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)
> > @@ -312,33 +363,34 @@ 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)
> > )
> > @@ -364,14 +416,29 @@ 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 to execute the
> > command.
>
> confusing timeout
>
Ack.
> > +
> > + 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(
> > @@ -381,9 +448,13 @@ 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.
> > @@ -393,9 +464,10 @@ 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()
> > @@ -414,8 +486,8 @@ 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 166eb8430e..69eb33ccb1 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
> > @@ -52,17 +57,17 @@ 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.
> > @@ -72,6 +77,9 @@ 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()
>
