[PATCH net-next 0/4] mptcp: pm: in-kernel: fullmesh endp nb + bind cases

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

Here is a small optimisation for the in-kernel PM, joined by a small
behavioural change to avoid confusions, and followed by a few more
tests.

- Patch 1: record fullmesh endpoints numbers, not to iterate over all
  endpoints to check if one is marked as fullmesh.

- Patch 2: when at least one endpoint is marked as fullmesh, only use
  these endpoints when reacting to an ADD_ADDR, even if there are no
  endpoints for this IP family: this is less confusing.

- Patch 3: reduce duplicated code to prepare the next patch.

- Patch 4: extra "bind" cases: the listen socket restrict the bind to
  one IP address, not allowing MP_JOIN to extra IP addresses, except if
  another listening socket accepts them.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
Matthieu Baerts (NGI0) (4):
      mptcp: pm: in-kernel: record fullmesh endp nb
      mptcp: pm: in kernel: only use fullmesh endp if any
      selftests: mptcp: join: do_transfer: reduce code dup
      selftests: mptcp: join: validate extra bind cases

 include/uapi/linux/mptcp.h                        |   3 +-
 net/mptcp/pm_kernel.c                             |  36 ++++-
 net/mptcp/protocol.h                              |   1 +
 net/mptcp/sockopt.c                               |   2 +
 tools/testing/selftests/net/mptcp/mptcp_connect.c |  10 +-
 tools/testing/selftests/net/mptcp/mptcp_join.sh   | 187 +++++++++++++++++++---
 6 files changed, 213 insertions(+), 26 deletions(-)
---
base-commit: 01cc760632b875c4ad0d8fec0b0c01896b8a36d4
change-id: 20251101-net-next-mptcp-fm-endp-nb-bind-cf7ab688d9f1

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