Merge branch 'mptcp-fixes'

Matthieu Baerts says:

====================
mptcp: misc. fixes for v6.8

This series includes 4 types of fixes:

Patches 1 and 2 force the path-managers not to allocate a new address
entry when dealing with the "special" ID 0, reserved to the address of
the initial subflow. These patches can be backported up to v5.19 and
v5.12 respectively.

Patch 3 to 6 fix the in-kernel path-manager not to create duplicated
subflows. Patch 6 is the main fix, but patches 3 to 5 are some kind of
pre-requisities: they fix some data races that could also lead to the
creation of unexpected subflows. These patches can be backported up to
v5.7, v5.10, v6.0, and v5.15 respectively.

Note that patch 3 modifies the existing ULP API. No better solutions
have been found for -net, and there is some similar prior art, see
commit 0df48c26d841 ("tcp: add tcpi_bytes_acked to tcp_info"). Please
also note that TLS ULP Diag has likely the same issue.

Patches 7 to 9 fix issues in the selftests, when executing them on older
kernels, e.g. when testing the last version of these kselftests on the
v5.15.148 kernel as it is done by LKFT when validating stable kernels.
These patches only avoid printing expected errors the console and
marking some tests as "OK" while they have been skipped. Patches 7 and 8
can be backported up to v6.6.

Patches 10 to 13 make sure all MPTCP selftests subtests have a unique
name. It is important to have a unique (sub)test name in TAP, because
that's the test identifier. Some CI environments might drop tests with
duplicated names. Patches 10 to 12 can be backported up to v6.6.
====================

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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