[PATCH mptcp-net v2 0/6] selftests: mptcp: join: fix flaky tests

["Matthieu Baerts (NGI0)" <matttbe@kernel.org>]

When looking at the recent CI results on NIPA and MPTCP CIs, a few MPTCP
Join tests are marked as unstable. Here are some fixes for that.

- Patch 1: a small fix for mptcp_connect.sh, printing a note as
  initially intended. For >=v5.13.

- Patch 2: avoid unexpected reset when closing subflows. For >= 5.13.

- Patches 3-4: longer transfer when not waiting for the end. For >=5.18.

- Patch 5: drop noisy plain RST packets when looking for MP_FASTCLOSE.
  For >= 5.18.

- Patch 6: read all received data when expecting a reset. For >= v6.1.

When reviewing patches 2-6, please double check that I'm not hiding real
issues by tweaking the tests suite.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
Changes in v2:
- Patch 6: also handle EPIPE properly.
- Link to v1: https://patch.msgid.link/20251101-slft-join-inst-v1-0-10572512a0b2@kernel.org

---
Matthieu Baerts (NGI0) (6):
      selftests: mptcp: connect: fix fallback note due to OoO
      selftests: mptcp: join: rm: set backup flag
      selftests: mptcp: join: endpoints: longer transfer
      selftests: mptcp: join: userspace: longer transfer
      selftests: mptcp: join: fastclose: drop plain RST
      selftests: mptcp: connect: trunc: read all recv data

 tools/testing/selftests/net/mptcp/mptcp_connect.c  | 18 ++--
 tools/testing/selftests/net/mptcp/mptcp_connect.sh |  2 +-
 tools/testing/selftests/net/mptcp/mptcp_join.sh    | 95 +++++++++++++---------
 3 files changed, 69 insertions(+), 46 deletions(-)
---
base-commit: b9e1acc39cbc985ca8df781775718e39e421409b
change-id: 20251029-slft-join-inst-e307faf42138

Best regards,
-- 
Matthieu Baerts (NGI0) <matttbe@kernel.org>