[PATCH mptcp-net 0/2] selftests: mptcp: lib: get MIB counters for the right test

In case of errors, mptcp_lib_pr_nstat is called to dump the nstat
counters, but for some tests, it was dumping the counters for all
subtests, not just the current one.

That's an issue for tests that don't recreate the netns for each
subtest, e.g. mptcp_connect.sh. In this case, 'nstat -a' will look at
the absolute counters since the creation of the netns, making
debugging harder.

Instead, it should dump the counters for the current test, by using the
history recorded in /tmp/<ns>.nstat, if available, and not using '-a'
which was dumping the absolute values instead of calculating increments.

While at it, rename the previous 'hist' variable to 'cache' as it was
used to look at the cache, not the nstat history.

Do the same in mptcp_lib_get_counter, even if it wasn't an issue for
the moment. Still, good to fix it for future usage, and to align it
with the rest.

Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>
---
Matthieu Baerts (NGI0) (2):
      selftests: mptcp: lib: dump nstat for the right test
      selftests: mptcp: lib: get counters for the right test

 tools/testing/selftests/net/mptcp/mptcp_lib.sh | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)
---
base-commit: ab76ed72e0bed8352d3b8e2b4d1be7c823e5fba3
change-id: 20260813-sft-mptcp-nstat-hist-33411708430f

Best regards,
--  
Matthieu Baerts (NGI0) <[email protected]>