[PATCH mptcp-next 0/2] Add MPTCP support for NBD

[Geliang Tang <geliang@kernel.org>]

From: Geliang Tang <tanggeliang@kylinos.cn>

This series adds MPTCP (Multipath TCP) support to NBD (Network Block
Device) and includes comprehensive tests.

MPTCP can aggregate bandwidth from multiple network interfaces, providing
significant performance improvements in multi-NIC scenarios. Our tests
with 4 virtual NICs (each limited to 1000 Mbit/s / 125 MB/s) show ~4x
bandwidth improvement: TCP achieves ~110 MiB/s while MPTCP achieves
~400 MiB/s for both read and write operations.

The first patch adds MPTCP socket support to the kernel NBD driver by
allowing MPTCP sockets in nbd_get_socket().

The second patch adds a comprehensive test script (mptcp_nbd.sh) that
validates NBD over both TCP and MPTCP.

Geliang Tang (2):
  nbd: allow MPTCP sockets
  selftests: mptcp: add mptcp nbd tests

 drivers/block/nbd.c                           |   4 +-
 tools/testing/selftests/net/mptcp/Makefile    |   1 +
 tools/testing/selftests/net/mptcp/config      |   1 +
 .../testing/selftests/net/mptcp/mptcp_lib.sh  |  13 +
 .../testing/selftests/net/mptcp/mptcp_nbd.sh  | 309 ++++++++++++++++++
 5 files changed, 327 insertions(+), 1 deletion(-)
 create mode 100755 tools/testing/selftests/net/mptcp/mptcp_nbd.sh

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2.55.0