Merge branch 'soreuseport-fix-broken-so_incoming_cpu'

Merge branch 'soreuseport-fix-broken-so_incoming_cpu'

Kuniyuki Iwashima says:

====================
soreuseport: Fix broken SO_INCOMING_CPU.

setsockopt(SO_INCOMING_CPU) for UDP/TCP is broken since 4.5/4.6 due to
these commits:

  * e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")
  * c125e80b8868 ("soreuseport: fast reuseport TCP socket selection")

These commits introduced the O(1) socket selection algorithm and removed
O(n) iteration over the list, but it ignores the score calculated by
compute_score().  As a result, it caused two misbehaviours:

  * Unconnected sockets receive packets sent to connected sockets
  * SO_INCOMING_CPU does not work

The former is fixed by commit acdcecc61285 ("udp: correct reuseport
selection with connected sockets").  This series fixes the latter and
adds some tests for SO_INCOMING_CPU.
====================

Link: https://lore.kernel.org/r/20221021204435.4259-1-kuniyu@amazon.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>