netdev - [PATCH net-next 0/5] tcp: lockless listener fixes and improvement

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Date:	Sun,  4 Oct 2015 21:08:06 -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>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 0/5] tcp: lockless listener fixes and improvement

This fixes issues with TCP FastOpen vs lockless listeners,
and SYNACK being attached to request sockets.

Then, last patch brings performance improvement for
syncookies generation and validation.

Tested under a 4.3 Mpps SYNFLOOD attack, new perf profile looks
like :
    12.11%  [kernel]  [k] sha_transform
     5.83%  [kernel]  [k] tcp_conn_request
     4.59%  [kernel]  [k] __inet_lookup_listener
     4.11%  [kernel]  [k] ipt_do_table
     3.91%  [kernel]  [k] tcp_make_synack
     3.05%  [kernel]  [k] fib_table_lookup
     2.74%  [kernel]  [k] sock_wfree
     2.66%  [kernel]  [k] memcpy_erms
     2.12%  [kernel]  [k] tcp_v4_rcv

Eric Dumazet (5):
  tcp: fix fastopen races vs lockless listener
  inet: ip_skb_dst_mtu() should use sk_fullsock()
  ipv6: inet6_sk() should use sk_fullsock()
  net: use sk_fullsock() in __netdev_pick_tx()
  tcp: avoid two atomic ops for syncookies

 include/linux/ipv6.h       |  4 ++--
 include/net/inet_sock.h    |  3 ++-
 include/net/ip.h           |  9 ++++++---
 include/net/request_sock.h | 12 +++++++++---
 net/core/dev.c             |  1 +
 net/dccp/ipv4.c            |  2 +-
 net/dccp/ipv6.c            |  2 +-
 net/ipv4/syncookies.c      |  2 +-
 net/ipv4/tcp_fastopen.c    | 26 +++++++-------------------
 net/ipv4/tcp_input.c       | 14 ++++++++++----
 net/ipv6/syncookies.c      |  2 +-
 11 files changed, 41 insertions(+), 36 deletions(-)

-- 
2.6.0.rc2.230.g3dd15c0

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