Re: [PATCH v3 4/7] dts: allow passing parameters into interactive apps

[Jeremy Spewock <jspewock@iol.unh.edu>]

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On Thu, Nov 16, 2023 at 1:53 PM Juraj Linkeš <juraj.linkes@pantheon.tech>
wrote:

> On Mon, Nov 13, 2023 at 9:28 PM <jspewock@iol.unh.edu> wrote:
> >
> > From: Jeremy Spewock <jspewock@iol.unh.edu>
> >
> > Modified interactive applications to allow for the ability to pass
> > parameters into the app on start up. Also modified the way EAL
> > parameters are handled so that the trailing "--" separator is added be
> > default after all EAL parameters.
> >
> > Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>
> > ---
> >  dts/framework/remote_session/remote/testpmd_shell.py |  2 +-
> >  dts/framework/testbed_model/sut_node.py              | 11 +++++++----
> >  2 files changed, 8 insertions(+), 5 deletions(-)
> >
> > diff --git a/dts/framework/remote_session/remote/testpmd_shell.py
> b/dts/framework/remote_session/remote/testpmd_shell.py
> > index 3ea16c7ab3..3f6a86aa35 100644
> > --- a/dts/framework/remote_session/remote/testpmd_shell.py
> > +++ b/dts/framework/remote_session/remote/testpmd_shell.py
> > @@ -32,7 +32,7 @@ def _start_application(
> >          self, get_privileged_command: Callable[[str], str] | None
> >      ) -> None:
> >          """See "_start_application" in InteractiveShell."""
> > -        self._app_args += " -- -i"
> > +        self._app_args += " -i"
> >          super()._start_application(get_privileged_command)
> >
> >      def get_devices(self) -> list[TestPmdDevice]:
> > diff --git a/dts/framework/testbed_model/sut_node.py
> b/dts/framework/testbed_model/sut_node.py
> > index 4161d3a4d5..bcac939e72 100644
> > --- a/dts/framework/testbed_model/sut_node.py
> > +++ b/dts/framework/testbed_model/sut_node.py
> > @@ -377,7 +377,8 @@ def create_interactive_shell(
> >          shell_cls: Type[InteractiveShellType],
> >          timeout: float = SETTINGS.timeout,
> >          privileged: bool = False,
> > -        eal_parameters: EalParameters | str | None = None,
> > +        eal_parameters: EalParameters | str = "",
>
> I think it makes more sense if the type is EalParameters | None. With
> this change, the str type of eal_parameters moved to app_parameters.
>
> > +        app_parameters: str = "",
> >      ) -> InteractiveShellType:
> >          """Factory method for creating a handler for an interactive
> session.
> >
> > @@ -392,12 +393,14 @@ def create_interactive_shell(
> >              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().
> > +            app_parameters: Additional arguments to pass into the
> application on the
> > +                command-line.
> >          Returns:
> >              Instance of the desired interactive application.
> >          """
> > -        if not eal_parameters:
> > +        if not eal_parameters and shell_cls.dpdk_app:
> >              eal_parameters = self.create_eal_parameters()
> > -
> > +            eal_parameters = f"{eal_parameters} --"
>
> I think this change is more complicated than it seems at first glance.
>
> Before we either passed EalParameters (meant for DPDK apps) or a
> string (meant for other apps). There was no additional check for these
> assumptions.
> Now that we've split it, I see some cases which seem to be not covered.
>
> 1. The app is a DPDK app and we pass EalParameters. The two hyphens
> are not added.
> 2. The app is not a DPDK app and we pass EalParameters. Similarly to
> current behavior (without the patch), we kinda assume that the caller
> won't do this, but now that we're modifying the behavior, let's add a
> check that won't allow EalParameters with non-DPDK apps.
>
>
That is a good point that not all DPDk apps need the two hyphens, I can
make that just specific to testpmd and change it instead so that we don't
pass EalParameters into DPDK applications and I think that should cover
these cases.



> >          # We need to append the build directory for DPDK apps
> >          if shell_cls.dpdk_app:
> >              shell_cls.path = self.main_session.join_remote_path(
> > @@ -405,7 +408,7 @@ def create_interactive_shell(
> >              )
> >
> >          return super().create_interactive_shell(
> > -            shell_cls, timeout, privileged, str(eal_parameters)
> > +            shell_cls, timeout, privileged, f"{eal_parameters}
> {app_parameters}"
> >          )
> >
> >      def bind_ports_to_driver(self, for_dpdk: bool = True) -> None:
> > --
> > 2.42.0
> >
>

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