This series is a preparation work for future in-kernel MPTCP sockets
usage. Here, two interfaces are implemented: read_sock and splice_read.
As a result of this series, splice() with MPTCP sockets -- which was
already supported -- is now improved.

- Patches 1-2: .read_sock implementation

- Patches 3-4: .splice_read implementation

- Patches 5-6: validate splice() support with MPTCP sockets.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
Geliang Tang (6):
      mptcp: add eat_recv_skb helper
      mptcp: implement .read_sock
      tcp: export tcp_splice_state
      mptcp: implement .splice_read
      selftests: mptcp: add splice io mode
      selftests: mptcp: connect: cover splice mode

 include/net/tcp.h                                  |  11 ++
 net/ipv4/tcp.c                                     |  13 +-
 net/mptcp/protocol.c                               | 215 ++++++++++++++++++++-
 tools/testing/selftests/net/mptcp/Makefile         |   1 +
 tools/testing/selftests/net/mptcp/mptcp_connect.c  |  63 +++++-
 .../selftests/net/mptcp/mptcp_connect_splice.sh    |   5 +
 6 files changed, 289 insertions(+), 19 deletions(-)
---
base-commit: e75e408dc524ba32b3bd66e89d2ba1e337877bfa
change-id: 20260129-net-next-mptcp-splice-62db4a1a9c52

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