Merge branch 'vsock-so_inq-for-stream-sockets'

David Carlier says:

====================
vsock: SO_INQ for stream sockets

This is the follow-up announced in the receive queue hint series [1]:
SO_INQ and SCM_INQ for AF_VSOCK stream sockets, as AF_UNIX has.

Patch 1 moves the SOL_SOCKET option handling to a helper without
functional change, patch 2 adds SO_INQ and patch 3 covers it in
vsock_test.

The value is the one SIOCINQ returns, so on Hyper-V it covers the
current packet only. Accepted sockets inherit the flag from the
listener, and the sockmap receive path does not report it.

Tested over loopback with vsock_test and vsock_uring_test.

v2: https://lore.kernel.org/netdev/20261015154334.3217358-1-devnexen@gmail.com/
v1: https://lore.kernel.org/netdev/20261012235524.41468-1-devnexen@gmail.com/

[1] https://lore.kernel.org/netdev/20260923184008.153541-1-devnexen@gmail.com/
====================

Link: https://patch.msgid.link/20261016132716.272018-1-devnexen@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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