[PATCH mptcp-next 0/5] selftests: mptcp: get counters from nstat history

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

When debugging MPTCP Join selftest with a "debug" kernel config, I
noticed checking all the different counters was sometimes slower than
the test itself. Fetching the counters once, then reading them from the
history file that was already there seems to save more than 5 minutes
when running the whole MPTCP Join selftest.

- Patch 1: move code to mptcp_lib.sh to prepare the new features.

- Patch 2: simplify mptcp_lib_pr_err_stats helper use.

- Patch 3: remove unused last column from nstat output.

- Patch 4: improve stats dump in mptcp_join.sh.

- Patch 5: get counters from nstat history.

Based-on: <20251102-slft-join-inst-v2-0-b4f3ba15a7c4@kernel.org>

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
Matthieu Baerts (NGI0) (5):
      selftests: mptcp: lib: introduce 'nstat_{init,get}'
      selftests: mptcp: lib: remove stats files args
      selftests: mptcp: lib: stats: remove nstat rate columns
      selftests: mptcp: join: dump stats from history
      selftests: mptcp: lib: get counters from nstat history

 tools/testing/selftests/net/mptcp/mptcp_connect.sh | 100 ++++++++-------------
 tools/testing/selftests/net/mptcp/mptcp_join.sh    |  31 ++++---
 tools/testing/selftests/net/mptcp/mptcp_lib.sh     |  45 ++++++++--
 tools/testing/selftests/net/mptcp/mptcp_sockopt.sh |  15 ++--
 tools/testing/selftests/net/mptcp/simult_flows.sh  |  15 ++--
 5 files changed, 104 insertions(+), 102 deletions(-)
---
base-commit: 1b41f9e417a8db60baf3686b81346131d2d81f30
change-id: 20251101-slft-nstat-cache-db4d2962c5ce

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