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Eric Dumazet e994b2f0fb tcp: do not lock listener to process SYN packets 
Everything should now be ready to finally allow SYN
packets processing without holding listener lock.

Tested:

3.5 Mpps SYNFLOOD. Plenty of cpu cycles available.

Next bottleneck is the refcount taken on listener,
that could be avoided if we remove SLAB_DESTROY_BY_RCU
strict semantic for listeners, and use regular RCU.

    13.18%  [kernel]  [k] __inet_lookup_listener
     9.61%  [kernel]  [k] tcp_conn_request
     8.16%  [kernel]  [k] sha_transform
     5.30%  [kernel]  [k] inet_reqsk_alloc
     4.22%  [kernel]  [k] sock_put
     3.74%  [kernel]  [k] tcp_make_synack
     2.88%  [kernel]  [k] ipt_do_table
     2.56%  [kernel]  [k] memcpy_erms
     2.53%  [kernel]  [k] sock_wfree
     2.40%  [kernel]  [k] tcp_v4_rcv
     2.08%  [kernel]  [k] fib_table_lookup
     1.84%  [kernel]  [k] tcp_openreq_init_rwin

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-10-03 04:32:46 -07:00
..
netfilter
ipv4: Pass struct net into ip_route_me_harder
2015-09-29 20:21:32 +02:00
af_inet.c
net: Replace vrf_dev_table and friends
2015-09-29 20:40:33 -07:00
ah4.c
ah4: Fix error return in ah_input().
2015-08-25 13:38:50 -07:00
arp.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-09-26 16:08:27 -07:00
cipso_ipv4.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
datagram.c
net: Set sk_txhash from a random number
2015-07-29 22:44:04 -07:00
devinet.c
rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats
2015-09-15 15:25:02 -07:00
esp4.c
esp4: Switch to new AEAD interface
2015-05-28 11:23:20 +08:00
fib_frontend.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-10-02 07:21:25 -07:00
fib_lookup.h
ipv4: consider TOS in fib_select_default
2015-07-24 22:46:11 -07:00
fib_rules.c
net: ipv6: use common fib_default_rule_pref
2015-09-09 14:19:50 -07:00
fib_semantics.c
net: Make table id type u32
2015-09-01 14:32:44 -07:00
fib_trie.c
net: Fix vti use case with oif in dst lookups
2015-09-17 16:36:34 -07:00
fou.c
fou: reject IPv6 config
2015-08-29 13:07:54 -07:00
gre_demux.c
gre: Remove support for sharing GRE protocol hook.
2015-08-10 14:03:54 -07:00
gre_offload.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
icmp.c
net: Replace vrf_master_ifindex{, _rcu} with l3mdev equivalents
2015-09-29 20:40:33 -07:00
igmp.c
net/ipv4: Pass proto as u8 instead of u16 in ip_check_mc_rcu
2015-09-29 16:27:47 -07:00
inet_connection_sock.c
tcp/dccp: add a reschedule point in inet_csk_listen_stop()
2015-10-03 04:32:45 -07:00
inet_diag.c
tcp/dccp: install syn_recv requests into ehash table
2015-10-03 04:32:41 -07:00
inet_fragment.c
inet: frags: remove INET_FRAG_EVICTED and use list_evictor for the test
2015-07-26 21:00:15 -07:00
inet_hashtables.c
tcp/dccp: install syn_recv requests into ehash table
2015-10-03 04:32:41 -07:00
inet_lro.c
lro: remove dead code
2013-12-29 16:34:25 -05:00
inet_timewait_sock.c
tcp/dccp: fix timewait races in timer handling
2015-09-21 16:32:29 -07:00
inetpeer.c
net: Add helper function to compare inetpeer addresses
2015-08-28 13:32:36 -07:00
ip_forward.c
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
ip_fragment.c
net: Replace vrf_master_ifindex{, _rcu} with l3mdev equivalents
2015-09-29 20:40:33 -07:00
ip_gre.c
ip_tunnels: record IP version in tunnel info
2015-08-29 13:07:54 -07:00
ip_input.c
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
ip_options.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
ip_output.c
net: Rename IFF_VRF_MASTER to IFF_L3MDEV_MASTER
2015-09-29 20:40:32 -07:00
ip_sockglue.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-06-24 02:58:51 -07:00
ip_tunnel_core.c
lwtunnel: remove source and destination UDP port config option
2015-09-24 14:31:37 -07:00
ip_tunnel.c
ip_gre: Add support to collect tunnel metadata.
2015-08-10 14:03:54 -07:00
ip_vti.c
net: Merge dst_output and dst_output_sk
2015-09-17 17:18:32 -07:00
ipcomp.c
ipv4: coding style: comparison for equality with NULL
2015-04-03 12:11:15 -04:00
ipconfig.c
net: ipv4: increase dhcp inter device timeout
2015-08-12 16:40:22 -07:00
ipip.c
ip_gre: Add support to collect tunnel metadata.
2015-08-10 14:03:54 -07:00
ipmr.c
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
Kconfig
geneve: Consolidate Geneve functionality in single module.
2015-08-27 15:42:48 -07:00
Makefile
geneve: Consolidate Geneve functionality in single module.
2015-08-27 15:42:48 -07:00
netfilter.c
ipv4: Pass struct net into ip_route_me_harder
2015-09-29 20:21:32 +02:00
ping.c
ipv6: Nonlocal bind
2015-07-09 21:09:10 -07:00
proc.c
net: track success and failure of TCP PMTU probing
2015-07-21 22:36:33 -07:00
protocol.c
net: Export inet_offloads and inet6_offloads
2014-09-19 17:15:31 -04:00
raw.c
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
route.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-10-02 07:21:25 -07:00
syncookies.c
tcp/dccp: install syn_recv requests into ehash table
2015-10-03 04:32:41 -07:00
sysctl_net_ipv4.c
IGMP: Inhibit reports for local multicast groups
2015-08-28 13:28:47 -07:00
tcp_bic.c
tcp: add tcp_in_slow_start helper
2015-07-09 14:22:52 -07:00
tcp_cdg.c
tcp: do not slow start when cwnd equals ssthresh
2015-07-09 14:22:52 -07:00
tcp_cong.c
tcp: remove tcp_ecn_make_synack() socket argument
2015-09-25 13:00:38 -07:00
tcp_cubic.c
tcp_cubic: do not set epoch_start in the future
2015-09-17 22:35:07 -07:00
tcp_dctcp.c
net: tcp: dctcp_update_alpha() fixes.
2015-06-10 23:28:33 -07:00
tcp_diag.c
sock_diag: implement a get_info handler for inet
2015-06-15 19:49:22 -07:00
tcp_fastopen.c
tcp: attach SYNACK messages to request sockets instead of listener
2015-10-03 04:32:43 -07:00
tcp_highspeed.c
tcp: add tcp_in_slow_start helper
2015-07-09 14:22:52 -07:00
tcp_htcp.c
tcp: add tcp_in_slow_start helper
2015-07-09 14:22:52 -07:00
tcp_hybla.c
tcp: do not slow start when cwnd equals ssthresh
2015-07-09 14:22:52 -07:00
tcp_illinois.c
tcp: add tcp_in_slow_start helper
2015-07-09 14:22:52 -07:00
tcp_input.c
tcp: attach SYNACK messages to request sockets instead of listener
2015-10-03 04:32:43 -07:00
tcp_ipv4.c
tcp: do not lock listener to process SYN packets
2015-10-03 04:32:46 -07:00
tcp_lp.c
tcp: remove in_flight parameter from cong_avoid() methods
2014-05-03 19:23:07 -04:00
tcp_memcontrol.c
memcg: cleanup static keys decrement
2015-02-12 18:54:10 -08:00
tcp_metrics.c
net: Add helper function to compare inetpeer addresses
2015-08-28 13:32:36 -07:00
tcp_minisocks.c
tcp: remove BUG_ON() in tcp_check_req()
2015-10-03 04:32:39 -07:00
tcp_offload.c
tcp: reserve tcp_skb_mss() to tcp stack
2015-06-11 16:33:10 -07:00
tcp_output.c
tcp: attach SYNACK messages to request sockets instead of listener
2015-10-03 04:32:43 -07:00
tcp_probe.c
tcp: whitespace fixes
2014-09-01 18:12:45 -07:00
tcp_scalable.c
tcp: add tcp_in_slow_start helper
2015-07-09 14:22:52 -07:00
tcp_timer.c
tcp: do not export tcp_init_xmit_timers()
2015-07-09 21:44:38 -07:00
tcp_vegas.c
tcp: add tcp_in_slow_start helper
2015-07-09 14:22:52 -07:00
tcp_vegas.h
tcp: prepare CC get_info() access from getsockopt()
2015-04-29 17:10:38 -04:00
tcp_veno.c
tcp: add tcp_in_slow_start helper
2015-07-09 14:22:52 -07:00
tcp_westwood.c
tcp_westwood: fix tcp_westwood_info()
2015-05-05 19:50:09 -04:00
tcp_yeah.c
tcp: stretch ACK fixes prep
2015-01-28 22:18:37 -08:00
tcp.c
tcp: prepare fastopen code for upcoming listener changes
2015-09-29 16:53:10 -07:00
tunnel4.c
net: Convert printks to pr_<level>
2012-03-11 23:42:51 -07:00
udp_diag.c
sock_diag: specify info_size per inet protocol
2015-06-15 19:49:22 -07:00
udp_impl.h
net: Remove iocb argument from sendmsg and recvmsg
2015-03-02 13:06:31 -05:00
udp_offload.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
udp_tunnel.c
tunnel: introduce udp_tun_rx_dst()
2015-08-27 15:42:47 -07:00
udp.c
net: Rename IFF_VRF_MASTER to IFF_L3MDEV_MASTER
2015-09-29 20:40:32 -07:00
udplite.c
net: Eliminate no_check from protosw
2014-05-23 16:28:53 -04:00
xfrm4_input.c
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
xfrm4_mode_beet.c
ipv4: ERROR: code indent should use tabs where possible
2013-12-26 13:43:21 -05:00
xfrm4_mode_transport.c
…
xfrm4_mode_tunnel.c
ipv4: hash net ptr into fragmentation bucket selection
2015-03-25 14:07:04 -04:00
xfrm4_output.c
netfilter: Add blank lines in callers of netfilter hooks
2015-09-17 17:18:37 -07:00
xfrm4_policy.c
net: Replace vrf_master_ifindex{, _rcu} with l3mdev equivalents
2015-09-29 20:40:33 -07:00
xfrm4_protocol.c
xfrm4: Remove duplicate semicolon
2014-06-30 07:49:47 +02:00
xfrm4_state.c
inet: make no_pmtu_disc per namespace and kill ipv4_config
2013-12-18 16:58:20 -05:00
xfrm4_tunnel.c
sit: add IPv4 over IPv4 support
2013-05-31 17:19:05 -07:00