Merge branch 'so_incoming_cpu'

Eric Dumazet says:

====================
net: SO_INCOMING_CPU support

SO_INCOMING_CPU socket option (read by getsockopt()) provides
an alternative to RPS/RFS for high performance servers using
multi queues NIC.

TCP should use sk_mark_napi_id() for established sockets only.
====================

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