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linux/net/ipv4
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Herbert Xu 903ab86d19 udp: Add lockless transmit path 
The UDP transmit path has been running under the socket lock
for a long time because of the corking feature.  This means that
transmitting to the same socket in multiple threads does not
scale at all.

However, as most users don't actually use corking, the locking
can be removed in the common case.

This patch creates a lockless fast path where corking is not used.

Please note that this does create a slight inaccuracy in the
enforcement of socket send buffer limits.  In particular, we
may exceed the socket limit by up to (number of CPUs) * (packet
size) because of the way the limit is computed.

As the primary purpose of socket buffers is to indicate congestion,
this should not be a great problem for now.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-01 12:35:42 -08:00
..
netfilter Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-02-04 14:28:58 -08:00
af_inet.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-31 13:13:24 -08:00
ah4.c ipsec: allow to align IPv4 AH on 32 bits 2011-02-08 14:00:40 -08:00
arp.c net: arp_ioctl() must hold RTNL 2011-01-24 13:16:16 -08:00
cipso_ipv4.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
datagram.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
devinet.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-02-19 19:17:35 -08:00
esp4.c xfrm: Traffic Flow Confidentiality for IPv4 ESP 2010-12-10 14:43:59 -08:00
fib_frontend.c ipv4: Implement __ip_dev_find using new interface address hash. 2011-02-18 12:43:09 -08:00
fib_lookup.h ipv4: Remember FIB alias list head and table in lookup results. 2011-01-31 16:10:03 -08:00
fib_rules.c ipv4: Use const'ify fib_result deep in the route call chains. 2011-02-17 15:54:42 -08:00
fib_semantics.c ipv4: fix rcu lock imbalance in fib_select_default() 2011-02-14 11:23:04 -08:00
fib_trie.c ipv4: Avoid use of signed integers in fib_trie code. 2011-02-17 15:49:26 -08:00
gre.c tunnels: add _rcu annotations 2010-10-25 13:09:45 -07:00
icmp.c inetpeer: Move ICMP rate limiting state into inet_peer entries. 2011-02-04 15:59:53 -08:00
igmp.c igmp: refine skb allocations 2010-11-18 11:02:23 -08:00
inet_connection_sock.c tcp: disallow bind() to reuse addr/port 2011-01-11 14:03:07 -08:00
inet_diag.c Revert "netlink: test for all flags of the NLM_F_DUMP composite" 2011-01-19 13:34:20 -08:00
inet_fragment.c net/ipv4: EXPORT_SYMBOL cleanups 2010-07-12 12:57:54 -07:00
inet_hashtables.c inet: Fix __inet_inherit_port() to correctly increment bsockets and num_owners 2010-11-28 18:18:44 -08:00
inet_lro.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
inet_timewait_sock.c tcp: fix inet_twsk_deschedule() 2011-02-19 18:59:04 -08:00
inetpeer.c inetpeer: Add redirect and PMTU discovery cached info. 2011-02-10 13:29:30 -08:00
ip_forward.c net-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
ip_fragment.c ipv4: IP defragmentation must be ECN aware 2011-01-06 11:21:30 -08:00
ip_gre.c ip_gre: Add IPPROTO_GRE to flowi in ipgre_tunnel_xmit 2011-02-11 11:23:12 -08:00
ip_input.c netfilter: fix Kconfig dependencies 2011-01-14 13:36:42 +01:00
ip_options.c bridge : Sanitize skb before it enters the IP stack 2010-09-19 12:42:34 -07:00
ip_output.c inet: Add ip_make_skb and ip_finish_skb 2011-03-01 12:35:03 -08:00
ip_sockglue.c ipv4: add __rcu annotations to ip_ra_chain 2010-10-25 14:18:28 -07:00
ipcomp.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
ipconfig.c net: add some KERN_CONT markers to continuation lines 2010-11-28 10:47:17 -08:00
ipip.c ipip: add module alias for tunl0 tunnel device 2010-12-01 12:53:23 -08:00
ipmr.c net: Support compat SIOCGETVIFCNT ioctl in ipv4. 2011-02-03 17:24:28 -08:00
Kconfig ipv4: Remove fib_hash. 2011-02-01 15:35:25 -08:00
Makefile ipv4: Remove fib_hash. 2011-02-01 15:35:25 -08:00
netfilter.c net: use the macros defined for the members of flowi 2010-11-17 12:27:45 -08:00
proc.c tcp: Replace time wait bucket msg by counter 2010-12-08 12:16:33 -08:00
protocol.c net: add __rcu annotations to protocol 2010-10-27 11:37:31 -07:00
raw.c net: Add compat ioctl support for the ipv4 multicast ioctl SIOCGETSGCNT 2011-01-30 01:14:38 -08:00
route.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-02-19 19:17:35 -08:00
syncookies.c net: use the macros defined for the members of flowi 2010-11-17 12:27:45 -08:00
sysctl_net_ipv4.c net: add limits to ip_default_ttl 2010-12-13 12:16:14 -08:00
tcp.c tcp: Remove debug macro of TCP_CHECK_TIMER 2011-02-20 11:10:14 -08:00
tcp_bic.c tcp: add helper for AI algorithm 2009-03-02 03:00:15 -08:00
tcp_cong.c net/ipv4: Eliminate kstrdup memory leak 2010-08-27 19:31:56 -07:00
tcp_cubic.c tcp: add helper for AI algorithm 2009-03-02 03:00:15 -08:00
tcp_diag.c tcp: diag: Dont report negative values for rx queue 2009-12-03 16:06:13 -08:00
tcp_highspeed.c
tcp_htcp.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
tcp_hybla.c TCP: tcp_hybla: Fix integer overflow in slow start increment 2010-06-02 07:15:48 -07:00
tcp_illinois.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
tcp_input.c tcp: Increase the initial congestion window to 10. 2011-02-02 20:48:47 -08:00
tcp_ipv4.c ipv4: Rearrange how ip_route_newports() gets port keys. 2011-02-24 13:38:12 -08:00
tcp_lp.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
tcp_minisocks.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-12-08 13:47:38 -08:00
tcp_output.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
tcp_probe.c net: ipv4: tcp_probe: cleanup snprintf() use 2010-11-17 12:27:46 -08:00
tcp_scalable.c tcp: add helper for AI algorithm 2009-03-02 03:00:15 -08:00
tcp_timer.c tcp: Remove debug macro of TCP_CHECK_TIMER 2011-02-20 11:10:14 -08:00
tcp_vegas.c tcp: tcp_vegas ssthresh bugfix 2009-05-25 22:44:59 -07:00
tcp_vegas.h
tcp_veno.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
tcp_westwood.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
tcp_yeah.c net/ipv4: Move && and || to end of previous line 2009-11-23 10:41:23 -08:00
tunnel4.c tunnels: add __rcu annotations 2010-10-27 11:37:32 -07:00
udp.c udp: Add lockless transmit path 2011-03-01 12:35:42 -08:00
udp_impl.h net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
udplite.c net: fix nulls list corruptions in sk_prot_alloc 2010-12-16 14:26:56 -08:00
xfrm4_input.c net/ipv4: EXPORT_SYMBOL cleanups 2010-07-12 12:57:54 -07:00
xfrm4_mode_beet.c ipsec: Interfamily IPSec BEET 2008-08-06 02:39:30 -07:00
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c ipv4: Don't pre-seed hoplimit metric. 2010-12-12 22:08:17 -08:00
xfrm4_output.c netfilter: ipv4: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:30 +01:00
xfrm4_policy.c xfrm: Const'ify address arguments to ->dst_lookup() 2011-02-23 23:07:38 -08:00
xfrm4_state.c xfrm: Const'ify tmpl and address arguments to ->init_temprop() 2011-02-23 23:07:37 -08:00
xfrm4_tunnel.c net: struct xfrm_tunnel in read_mostly section 2010-08-30 13:50:45 -07:00