Merge branch 'selftests-drv-net-convert-gro-and-toeplitz-tests-to-work-for-drivers-in-nipa'

Jakub Kicinski says:

====================
selftests: drv-net: convert GRO and Toeplitz tests to work for drivers in NIPA

Main objective of this series is to convert the gro.sh and toeplitz.sh
tests to be "NIPA-compatible" - meaning make use of the Python env,
which lets us run the tests against either netdevsim or a real device.

The tests seem to have been written with a different flow in mind.
Namely they source different bash "setup" scripts depending on arguments
passed to the test. While I have nothing against the use of bash and
the overall architecture - the existing code needs quite a bit of work
(don't assume MAC/IP addresses, support remote endpoint over SSH).
If I'm the one fixing it, I'd rather convert them to our "simplistic"
Python.

This series rewrites the tests in Python while addressing their
shortcomings. The functionality of running the test over loopback
on a real device is retained but with a different method of invocation
(see the last patch).

Once again we are dealing with a script which run over a variety of
protocols (combination of [ipv4, ipv6, ipip] x [tcp, udp]). The first
4 patches add support for test variants to our scripts. We use the
term "variant" in the same sense as the C kselftest_harness.h -
variant is just a set of static input arguments.

Note that neither GRO nor the Toeplitz test fully passes for me on
any HW I have access to. But this is unrelated to the conversion.
This series is not making any real functional changes to the tests,
it is limited to improving the "test harness" scripts.
====================

Link: https://patch.msgid.link/20251120021024.2944527-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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