Re: [PATCH net-next v2 06/12] selftests: net: py: support ksft ready without wait

[Petr Machata <petrm@nvidia.com>]

Jakub Kicinski <kuba@kernel.org> writes:

> There's a common synchronization problem when a script (Python test)
> uses a C program to set up some state (usually start a receiving
> process for traffic). The script needs to know when the process
> has fully initialized. The inverse of the problem exists for shutting
> the process down - we need a reliable way to tell the process to exit.
>
> We added helpers to do this safely in
> commit 71477137994f ("selftests: drv-net: add a way to wait for a local process")
> unfortunately the two operations (wait for init, and shutdown) are
> controlled by a single parameter (ksft_wait). Add support for using
> ksft_ready without using the second fd for exit.
>
> This is useful for programs which wait for a specific number of packets
> to rx so exit_wait is a good match, but we still need to wait for init.
>
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Reviewed-by: Petr Machata <petrm@nvidia.com>