[PATCH net-next v3 0/5] selftests: net: groundwork for YNL-based tests

[Jakub Kicinski <kuba@kernel.org>]

Currently the options for writing networking tests are C, bash or
some mix of the two. YAML/Netlink gives us the ability to easily
interface with Netlink in higher level laguages. In particular,
there is a Python library already available in tree, under tools/net.
Add the scaffolding which allows writing tests using this library.

The "scaffolding" is needed because the library lives under
tools/net and uses YAML files from under Documentation/.
So we need a small amount of glue code to find those things
and add them to TEST_FILES.

This series adds both a basic SW sanity test and driver
test which can be run against netdevsim or a real device.
When I develop core code I usually test with netdevsim,
then a real device, and then a backport to Meta's kernel.
Because of the lack of integration, until now I had
to throw away the (YNL-based) test script and netdevsim code.

Running tests in tree directly:

 $ ./tools/testing/selftests/net/nl_netdev.py
 KTAP version 1
 1..2
 ok 1 nl_netdev.empty_check
 ok 2 nl_netdev.lo_check
 # Totals: pass:2 fail:0 xfail:0 xpass:0 skip:0 error:0

in tree via make:

 $ make -C tools/testing/selftests/ TARGETS=net \
	TEST_PROGS=nl_netdev.py TEST_GEN_PROGS="" run_tests
  [ ... ]

and installed externally, all seem to work:

 $ make -C tools/testing/selftests/ TARGETS=net \
	install INSTALL_PATH=/tmp/ksft-net
 $ /tmp/ksft-net/run_kselftest.sh -t net:nl_netdev.py
  [ ... ]

For driver tests I followed the lead of net/forwarding and
get the device name from env and/or a config file.

v3:
 - fix up netdevsim C
 - various small nits in other patches (see changelog in patches)
v2: https://lore.kernel.org/all/20240403023426.1762996-1-kuba@kernel.org/
 - don't add to TARGETS, create a deperate variable with deps
 - support and use with
 - support and use passing arguments to tests
v1: https://lore.kernel.org/all/20240402010520.1209517-1-kuba@kernel.org/


Jakub Kicinski (5):
  selftests: net: add scaffolding for Netlink tests in Python
  selftests: nl_netdev: add a trivial Netlink netdev test
  netdevsim: report stats by default, like a real device
  selftests: drivers: add scaffolding for Netlink tests in Python
  testing: net-drv: add a driver test for stats reporting

 drivers/net/netdevsim/ethtool.c               |  11 ++
 drivers/net/netdevsim/netdev.c                |  49 ++++++++
 tools/testing/selftests/Makefile              |  10 +-
 tools/testing/selftests/drivers/net/Makefile  |   7 ++
 .../testing/selftests/drivers/net/README.rst  |  30 +++++
 .../selftests/drivers/net/lib/py/__init__.py  |  17 +++
 .../selftests/drivers/net/lib/py/env.py       |  52 ++++++++
 tools/testing/selftests/drivers/net/stats.py  |  86 +++++++++++++
 tools/testing/selftests/net/Makefile          |   1 +
 tools/testing/selftests/net/lib/Makefile      |   8 ++
 .../testing/selftests/net/lib/py/__init__.py  |   7 ++
 tools/testing/selftests/net/lib/py/consts.py  |   9 ++
 tools/testing/selftests/net/lib/py/ksft.py    |  96 +++++++++++++++
 tools/testing/selftests/net/lib/py/nsim.py    | 115 ++++++++++++++++++
 tools/testing/selftests/net/lib/py/utils.py   |  47 +++++++
 tools/testing/selftests/net/lib/py/ynl.py     |  49 ++++++++
 tools/testing/selftests/net/nl_netdev.py      |  24 ++++
 17 files changed, 617 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/drivers/net/Makefile
 create mode 100644 tools/testing/selftests/drivers/net/README.rst
 create mode 100644 tools/testing/selftests/drivers/net/lib/py/__init__.py
 create mode 100644 tools/testing/selftests/drivers/net/lib/py/env.py
 create mode 100755 tools/testing/selftests/drivers/net/stats.py
 create mode 100644 tools/testing/selftests/net/lib/Makefile
 create mode 100644 tools/testing/selftests/net/lib/py/__init__.py
 create mode 100644 tools/testing/selftests/net/lib/py/consts.py
 create mode 100644 tools/testing/selftests/net/lib/py/ksft.py
 create mode 100644 tools/testing/selftests/net/lib/py/nsim.py
 create mode 100644 tools/testing/selftests/net/lib/py/utils.py
 create mode 100644 tools/testing/selftests/net/lib/py/ynl.py
 create mode 100755 tools/testing/selftests/net/nl_netdev.py

-- 
2.44.0