[PATCH net-next v2 0/5] mptcp: out-of-order queue pruning

[Matthieu Baerts (NGI0)]

Under memory pressure, a pruning of the MPTCP-level OoO queue might be
required as last resort, to avoid too long recoveries, or even stalls.
Geliang and Gang managed to reproduce this behaviour, and Paolo
improved the situation thanks to the following patches:

- Patches 1-2: improve the MPTCP-level retransmission schema to make
  recoveries from memory pressure/after MPTCP-level drop significantly
  faster.

- Patches 3-4: make the admission check way stricter for incoming
  packets exceeding the memory limits, with some exceptions for fallback
  sockets.

- Patch 5: implement OoO queue pruning for MPTCP.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@xxxxxxxxxx>
---
Changes in v2:
- Address comments from Clashiko.
- Patch 3: typo, comment, bump TCP MIB counter.
- Patch 5: uniform MIB counter name.
- Rebased.
- Link to v1: https://patch.msgid.link/20260724-net-next-mptcp-oooq-pruning-v1-0-5dd4dec63a54@xxxxxxxxxx

---
Paolo Abeni (5):
      mptcp: move the retrans loop to a separate helper
      mptcp: let the retrans scheduler do its job
      mptcp: explicitly drop over memory limits
      mptcp: enforce hard limit on backlog flushing
      mptcp: implemented OoO queue pruning

 net/mptcp/mib.c      |   3 +
 net/mptcp/mib.h      |   3 +
 net/mptcp/options.c  |  32 ++++++-
 net/mptcp/protocol.c | 251 +++++++++++++++++++++++++++++++++++++--------------
 4 files changed, 219 insertions(+), 70 deletions(-)
---
base-commit: 2fbade66245059c78daeaccfce13ecf499fffb51
change-id: 20260724-net-next-mptcp-oooq-pruning-48566d10dbd0

Best regards,
--  
Matthieu Baerts (NGI0) <matttbe@xxxxxxxxxx>