Merge branch 'mptcp-next'

Mat Martineau says:

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mptcp: Miscellaneous changes for 5.19

Four separate groups of patches here:

Patch 1 optimizes flag checking when releasing mptcp socket locks.

Patches 2 and 3 update the packet scheduler when subflow priorities
change.

Patch 4 adds some pernet helper functions for MPTCP.

Patches 5-8 add diag support for MPTCP listeners, including a selftest.

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Signed-off-by: David S. Miller <davem@davemloft.net>