netdev - [PATCH net-next 0/5] tcp: add zero copy receive

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Date:   Mon, 16 Apr 2018 10:33:34 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 0/5] tcp: add zero copy receive

This patch series add mmap() support to TCP sockets for RX zero copy.

While tcp_mmap() patch itself is quite small (~100 LOC), optimal support
for asynchronous mmap() required better SO_RCVLOWAT behavior, and a
test program to demonstrate how mmap() on TCP sockets can be used.

Note that mmap() (and associated munmap()) calls are adding more
pressure on per-process VM semaphore, so might not show benefit
for processus with high number of threads.

Eric Dumazet (5):
  tcp: fix SO_RCVLOWAT and RCVBUF autotuning
  tcp: fix delayed acks behavior for SO_RCVLOWAT
  tcp: avoid extra wakeups for SO_RCVLOWAT users
  tcp: implement mmap() for zero copy receive
  selftests: net: add tcp_mmap program

 include/linux/net.h                    |   1 +
 include/net/tcp.h                      |   4 +
 net/core/sock.c                        |   5 +-
 net/ipv4/af_inet.c                     |   3 +-
 net/ipv4/tcp.c                         | 138 ++++++++
 net/ipv4/tcp_input.c                   |  22 +-
 net/ipv6/af_inet6.c                    |   3 +-
 tools/testing/selftests/net/Makefile   |   2 +
 tools/testing/selftests/net/tcp_mmap.c | 437 +++++++++++++++++++++++++
 9 files changed, 608 insertions(+), 7 deletions(-)
 create mode 100644 tools/testing/selftests/net/tcp_mmap.c

-- 
2.17.0.484.g0c8726318c-goog