[PATCH net-next 0/2] net: Add incoming CPU mask to sockets

[Tom Herbert <tom@herbertland.com>]

Added matching of CPU to a socket CPU mask. This is useful for TCP
listeners and unconnected UDP. This works with SO_REUSPORT to steer
packets to listener sockets based on CPU affinity. These patches
allow steering packets to listeners based on numa locality. This is
only useful for passive connections.

Tested: 200 TCP_RR with --r 512,512 streams ran against an echo server
with that sets both SO_REUSEPORT and SO_INCOMING_CPU_MASK. In the
test case used taskset to pin an instance to a set of CPUs corresponding
to a numa node and set SO_INCOMING_CPU_MASK to the same set of CPUS.

CPU utilization is reported from the echo server side.

IPv4
  No INCOMING_CPU_MASK
    83.48% CPU utilization
    1627173 tps
    106/185/382 50/90/99% latencies
  With INCOMING_CPU_MASK
    77.61% CPU utilization
    1669853 tps
    103/181/378 50/90/99% latencies
IPv6
  No INCOMING_CPU_MASK
    84.82% CPU utilization
    1551730 tps
    111/195/392 50/90/99% latencies
  With INCOMING_CPU_MASK
    79.25% CPU utilization
    1571911 tps
    110/191/381 50/90/99% latencies

Tom Herbert (2):
  kernel: Make compat bitmap functions externally visible
  net: Add incoming CPU mask to sockets

 arch/alpha/include/uapi/asm/socket.h   |  2 +
 arch/avr32/include/uapi/asm/socket.h   |  2 +
 arch/cris/include/uapi/asm/socket.h    |  2 +
 arch/frv/include/uapi/asm/socket.h     |  2 +
 arch/ia64/include/uapi/asm/socket.h    |  2 +
 arch/m32r/include/uapi/asm/socket.h    |  2 +
 arch/mips/include/uapi/asm/socket.h    |  2 +
 arch/mn10300/include/uapi/asm/socket.h |  2 +
 arch/parisc/include/uapi/asm/socket.h  |  2 +
 arch/powerpc/include/uapi/asm/socket.h |  2 +
 arch/s390/include/uapi/asm/socket.h    |  2 +
 arch/sparc/include/uapi/asm/socket.h   |  2 +
 arch/xtensa/include/uapi/asm/socket.h  |  2 +
 include/linux/compat.h                 |  2 +
 include/net/sock.h                     | 27 ++++++++++++
 include/uapi/asm-generic/socket.h      |  2 +
 kernel/compat.c                        |  7 ++-
 net/compat.c                           | 56 ++++++++++++++++++++++++
 net/core/sock.c                        | 80 ++++++++++++++++++++++++++++++++++
 net/ipv4/inet_hashtables.c             |  3 ++
 net/ipv4/udp.c                         |  6 +++
 net/ipv6/inet6_hashtables.c            |  3 ++
 net/ipv6/udp.c                         |  3 ++
 23 files changed, 213 insertions(+), 2 deletions(-)

-- 
1.8.1