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linux/net/ipv4
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Eric Dumazet be9f4a44e7 ipv4: tcp: remove per net tcp_sock 
tcp_v4_send_reset() and tcp_v4_send_ack() use a single socket
per network namespace.

This leads to bad behavior on multiqueue NICS, because many cpus
contend for the socket lock and once socket lock is acquired, extra
false sharing on various socket fields slow down the operations.

To better resist to attacks, we use a percpu socket. Each cpu can
run without contention, using appropriate memory (local node)

Additional features :

1) We also mirror the queue_mapping of the incoming skb, so that
answers use the same queue if possible.

2) Setting SOCK_USE_WRITE_QUEUE socket flag speedup sock_wfree()

3) We now limit the number of in-flight RST/ACK [1] packets
per cpu, instead of per namespace, and we honor the sysctl_wmem_default
limit dynamically. (Prior to this patch, sysctl_wmem_default value was
copied at boot time, so any further change would not affect tcp_sock
limit)

[1] These packets are only generated when no socket was matched for
the incoming packet.

Reported-by: Bill Sommerfeld <wsommerfeld@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-19 10:35:30 -07:00
..
netfilter Merge branch 'master' of git://1984.lsi.us.es/nf-next 2012-07-07 16:18:50 -07:00
af_inet.c ipv4: Early TCP socket demux. 2012-06-19 21:22:05 -07:00
ah4.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
arp.c Revert "ipv4: tcp: dont cache unconfirmed intput dst" 2012-06-27 17:05:06 -07:00
cipso_ipv4.c ipv4: Convert call_rcu() to kfree_rcu(), drop opt_kfree_rcu() 2012-02-21 09:03:31 -08:00
datagram.c ipv4: Lock socket and use cork flow in ip4_datagram_connect(). 2011-05-08 13:48:57 -07:00
devinet.c ipv4: Add interface option to enable routing of 127.0.0.0/8 2012-06-12 15:25:46 -07:00
esp4.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
fib_frontend.c ipv4: fix address selection in fib_compute_spec_dst 2012-07-19 08:30:49 -07:00
fib_lookup.h ipv4: Fix nexthop caching wrt. scoping. 2011-03-24 18:06:47 -07:00
fib_rules.c ipv4: Don't store a rule pointer in fib_result. 2012-07-13 08:21:29 -07:00
fib_semantics.c ipv4: fix rcu splat 2012-07-17 13:47:33 -07:00
fib_trie.c ipv4: Remove tb_peers from fib_table. 2012-07-12 09:39:28 -07:00
gre.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
icmp.c ipv4: Put proper checks into icmp_socket_deliver(). 2012-07-12 08:06:04 -07:00
igmp.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
inet_connection_sock.c ipv4: fix rcu splat 2012-07-17 13:47:33 -07:00
inet_diag.c net: make sock diag per-namespace 2012-07-16 22:31:34 -07:00
inet_fragment.c inetpeer: add parameter net for inet_getpeer_v4,v6 2012-06-08 14:27:23 -07:00
inet_hashtables.c ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
inet_lro.c net: add skb frag size accessors 2011-10-19 03:10:46 -04:00
inet_timewait_sock.c net: ipv4 and ipv6: Convert printk(KERN_DEBUG to pr_debug 2012-05-16 01:01:03 -04:00
inetpeer.c ipv4: Maintain redirect and PMTU info in struct rtable again. 2012-07-10 22:40:14 -07:00
ip_forward.c snmp: fix OutOctets counter to include forwarded datagrams 2012-06-07 14:50:56 -07:00
ip_fragment.c Revert "ipv4: tcp: dont cache unconfirmed intput dst" 2012-06-27 17:05:06 -07:00
ip_gre.c net: Pass optional SKB and SK arguments to dst_ops->{update_pmtu,redirect}() 2012-07-17 03:29:28 -07:00
ip_input.c ipv4: Kill early demux method return value. 2012-06-27 22:01:22 -07:00
ip_options.c ipv4: optimize fib_compute_spec_dst call in ip_options_echo 2012-07-19 08:30:49 -07:00
ip_output.c ipv4: tcp: remove per net tcp_sock 2012-07-19 10:35:30 -07:00
ip_sockglue.c ipv4: Create and use fib_compute_spec_dst() helper. 2012-06-28 03:59:11 -07:00
ip_vti.c net/ipv4: VTI support new module for ip_vti. 2012-07-18 09:36:12 -07:00
ipcomp.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
ipconfig.c net/ipv4/ipconfig: neaten __setup placement 2012-05-20 04:06:16 -04:00
ipip.c net: Pass optional SKB and SK arguments to dst_ops->{update_pmtu,redirect}() 2012-07-17 03:29:28 -07:00
ipmr.c net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
Kconfig net/ipv4: VTI support new module for ip_vti. 2012-07-18 09:36:12 -07:00
Makefile net/ipv4: VTI support new module for ip_vti. 2012-07-18 09:36:12 -07:00
netfilter.c net: Delete all remaining instances of ctl_path 2012-04-20 21:22:30 -04:00
ping.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
proc.c tcp: implement RFC 5961 4.2 2012-07-17 07:40:46 -07:00
protocol.c inet: Sanitize inet{,6} protocol demux. 2012-06-19 18:56:21 -07:00
raw.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
route.c ipv4: use seqlock for nh_exceptions 2012-07-19 10:30:14 -07:00
syncookies.c tcp: fix syncookie regression 2012-03-11 15:52:12 -07:00
sysctl_net_ipv4.c tcp: implement RFC 5961 3.2 2012-07-17 01:36:20 -07:00
tcp.c tcp: TCP Small Queues 2012-07-11 18:12:59 -07:00
tcp_bic.c tcp: fix undo after RTO for BIC 2012-01-20 14:17:26 -05:00
tcp_cong.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_cubic.c tcp: fix undo after RTO for CUBIC 2012-01-20 14:17:26 -05:00
tcp_diag.c inet_diag: Rename inet_diag_req into inet_diag_req_v2 2012-01-11 12:56:06 -08:00
tcp_highspeed.c tcp: mark tcp_congestion_ops read_mostly 2011-03-10 00:40:17 -08:00
tcp_htcp.c tcp: mark tcp_congestion_ops read_mostly 2011-03-10 00:40:17 -08:00
tcp_hybla.c tcp: bool conversions 2012-05-17 14:59:59 -04:00
tcp_illinois.c tcp: mark tcp_congestion_ops read_mostly 2011-03-10 00:40:17 -08:00
tcp_input.c tcp: refine SYN handling in tcp_validate_incoming 2012-07-18 09:31:25 -07:00
tcp_ipv4.c ipv4: tcp: remove per net tcp_sock 2012-07-19 10:35:30 -07:00
tcp_lp.c Fix common misspellings 2011-03-31 11:26:23 -03:00
tcp_memcontrol.c memcg: decrement static keys at real destroy time 2012-05-29 16:22:28 -07:00
tcp_metrics.c ipv6: add ipv6_addr_hash() helper 2012-07-18 11:28:46 -07:00
tcp_minisocks.c tcp: TCP Small Queues 2012-07-11 18:12:59 -07:00
tcp_output.c tcp: add LAST_ACK as a valid state for TSQ 2012-07-13 05:48:36 -07:00
tcp_probe.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
tcp_scalable.c tcp: mark tcp_congestion_ops read_mostly 2011-03-10 00:40:17 -08:00
tcp_timer.c tcp: early retransmit: delayed fast retransmit 2012-05-02 20:56:10 -04:00
tcp_vegas.c tcp: mark tcp_congestion_ops read_mostly 2011-03-10 00:40:17 -08:00
tcp_vegas.h
tcp_veno.c tcp: mark tcp_congestion_ops read_mostly 2011-03-10 00:40:17 -08:00
tcp_westwood.c tcp: mark tcp_congestion_ops read_mostly 2011-03-10 00:40:17 -08:00
tcp_yeah.c Fix common misspellings 2011-03-31 11:26:23 -03:00
tunnel4.c net: Convert printks to pr_<level> 2012-03-11 23:42:51 -07:00
udp.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
udp_diag.c net: make sock diag per-namespace 2012-07-16 22:31:34 -07:00
udp_impl.h ipv4: fix checkpatch errors 2012-04-15 12:37:19 -04:00
udplite.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
xfrm4_input.c Revert "ipv4: tcp: dont cache unconfirmed intput dst" 2012-06-27 17:05:06 -07:00
xfrm4_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c net/ipv4: VTI support rx-path hook in xfrm4_mode_tunnel. 2012-07-18 09:36:12 -07:00
xfrm4_output.c xfrm4: Don't call icmp_send on local error 2011-07-01 17:33:19 -07:00
xfrm4_policy.c net: Pass optional SKB and SK arguments to dst_ops->{update_pmtu,redirect}() 2012-07-17 03:29:28 -07:00
xfrm4_state.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
xfrm4_tunnel.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00