linux-kernel - [PATCH net-next 0/8] mptcp: receive path improvement

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Message-Id: <20250927-net-next-mptcp-rcv-path-imp-v1-0-5da266aa9c1a@kernel.org>
Date: Sat, 27 Sep 2025 11:40:36 +0200
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Neal Cardwell <ncardwell@...gle.com>, 
 Kuniyuki Iwashima <kuniyu@...gle.com>, David Ahern <dsahern@...nel.org>, 
 Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Subject: [PATCH net-next 0/8] mptcp: receive path improvement

This series includes several changes to the MPTCP RX path. The main
goals are improving the RX performances, and increase the long term
maintainability.

Some changes reflects recent(ish) improvements introduced in the TCP
stack: patch 1, 2 and 3 are the MPTCP counter part of SKB deferral free
and auto-tuning improvements. Note that patch 3 could possibly fix
additional issues, and overall such patch should protect from similar
issues to arise in the future.

Patches 4-7 are aimed at introducing the socket backlog usage which will
be done in a later series to process the packets received by the
different subflows while the msk socket is owned.

Patch 8 is not related to the RX path, but it contains additional tests
for new features recently introduced in net-next.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
Notes:
 - Sorry for sending this series that late, we had quite a few patches
   to upstream during this cycle. This is the last batch, and it has
   been heavily tested the last 2 weeks.
 - If there are some issues with some patches, but not with 1-3, it
   would be nice, if possible, if these 3 first patches can be accepted,
   to reduce the recently introduced gap with TCP.
 - Patches can be grouped like this if needed: 1-3, 4-5, 6-7, 8. 6-7 are
   preparing the ground for future on-going work, they can be dropped if
   there are issues with them.

---
Matthieu Baerts (NGI0) (1):
      selftests: mptcp: join: validate new laminar endp

Paolo Abeni (7):
      mptcp: leverage skb deferral free
      tcp: make tcp_rcvbuf_grow() accessible to mptcp code
      mptcp: rcvbuf auto-tuning improvement
      mptcp: introduce the mptcp_init_skb helper
      mptcp: remove unneeded mptcp_move_skb()
      mptcp: factor out a basic skb coalesce helper
      mptcp: minor move_skbs_to_msk() cleanup

 include/net/tcp.h                               |   1 +
 net/ipv4/tcp_input.c                            |   2 +-
 net/mptcp/protocol.c                            | 187 ++++++++++++------------
 net/mptcp/protocol.h                            |   4 +-
 tools/testing/selftests/net/mptcp/mptcp_join.sh |  69 +++++++++
 tools/testing/selftests/net/mptcp/pm_nl_ctl.c   |   9 ++
 6 files changed, 177 insertions(+), 95 deletions(-)
---
base-commit: 1493c18fe8696bfc758a97130a485fc4e08387f5
change-id: 20250927-net-next-mptcp-rcv-path-imp-192d8c24c9c7

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