[PATCH can-next v2 0/9] selftests: can: add J1939 socket and transport tests

[Oleksij Rempel]

net/can/j1939 has had no in-tree selftests. This series adds a kselftest
suite for the J1939 socket layer and the TP/ETP transport, run on vcan with
a CAN_RAW socket as an independent on-the-wire peer.

The timer checks are relaxed by default, for slow CI machines;
J1939_STRICT_TIMING selects tight bounds. Not covered yet: the ETP abort
and timeout paths, and a received Connection Abort on a kernel TX
session, which the stack currently ignores.

Known issue: the stack updates a session from the loopback echo of its
own CTS, RTS and DT frames, and a CAN_RAW peer can see that echo before
the stack does. A peer frame that follows quickly can then cancel the
session and fail a multi test. I have not seen this in QEMU runs. The fix
belongs in the stack, not in these tests.

I used an LLM coding assistant to write most of the test code and to
review it. I have read, edited and run all of it myself, on vcan under
QEMU.

v1: https://lore.kernel.org/all/20261014154435.3577983-1-o.rempel@xxxxxxxxxxxxxx/

---
Oleksij Rempel (9):
      selftests: can: install net/lib.sh with the CAN tests
      selftests: can: add J1939 test helper header and library
      selftests: can: add J1939 base functional tests
      selftests: can: add J1939 socket option and metadata tests
      selftests: can: add J1939 addressing and concurrency tests
      selftests: can: add J1939 wire-format tests against CAN_RAW
      selftests: can: add J1939 TP/ETP multi-frame tests against CAN_RAW
      selftests: can: cover J1939 transport abort and timeout paths
      selftests: can: check SO_J1939_PROMISC receive effect

 tools/testing/selftests/net/can/.gitignore         |   5 +
 tools/testing/selftests/net/can/Makefile           |  18 +-
 tools/testing/selftests/net/can/config             |   2 +
 tools/testing/selftests/net/can/j1939_lib.sh       |  86 ++
 tools/testing/selftests/net/can/j1939_tests.h      | 804 +++++++++++++++++++
 tools/testing/selftests/net/can/test_j1939_addr.c  | 679 ++++++++++++++++
 tools/testing/selftests/net/can/test_j1939_addr.sh |   4 +
 tools/testing/selftests/net/can/test_j1939_base.c  | 180 +++++
 tools/testing/selftests/net/can/test_j1939_base.sh |   4 +
 tools/testing/selftests/net/can/test_j1939_multi.c | 869 +++++++++++++++++++++
 .../testing/selftests/net/can/test_j1939_multi.sh  |   4 +
 tools/testing/selftests/net/can/test_j1939_opts.c  | 326 ++++++++
 tools/testing/selftests/net/can/test_j1939_opts.sh |   4 +
 tools/testing/selftests/net/can/test_j1939_wire.c  | 186 +++++
 tools/testing/selftests/net/can/test_j1939_wire.sh |   4 +
 15 files changed, 3173 insertions(+), 2 deletions(-)
---
base-commit: 734bef548a96e8774d6eef5dfa2026c6edc4e80b
change-id: 20261104-j1939-selftests-12fc860698c0

Best regards,
-- 
Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>