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linux/net/ipv4
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Eric Dumazet 83723d6071 netfilter: x_tables: dont block BH while reading counters 
Using "iptables -L" with a lot of rules have a too big BH latency.
Jesper mentioned ~6 ms and worried of frame drops.

Switch to a per_cpu seqlock scheme, so that taking a snapshot of
counters doesnt need to block BH (for this cpu, but also other cpus).

This adds two increments on seqlock sequence per ipt_do_table() call,
its a reasonable cost for allowing "iptables -L" not block BH
processing.

Reported-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-01-10 20:11:38 +01:00
..
netfilter
netfilter: x_tables: dont block BH while reading counters
2011-01-10 20:11:38 +01:00
af_inet.c
net: use the macros defined for the members of flowi
2010-11-17 12:27:45 -08:00
ah4.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
arp.c
net: RCU conversion of dev_getbyhwaddr() and arp_ioctl()
2010-12-08 10:07:24 -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
ipv4: Don't pre-seed hoplimit metric.
2010-12-12 22:08:17 -08:00
esp4.c
xfrm: Traffic Flow Confidentiality for IPv4 ESP
2010-12-10 14:43:59 -08:00
fib_frontend.c
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-12-26 22:37:05 -08:00
fib_hash.c
fib: Fix fib zone and its hash leak on namespace stop
2010-10-28 10:27:03 -07:00
fib_lookup.h
fib: fib_result_assign() should not change fib refcounts
2010-11-04 12:05:32 -07:00
fib_rules.c
fib: RCU conversion of fib_lookup()
2010-10-05 20:39:38 -07:00
fib_semantics.c
net: use the macros defined for the members of flowi
2010-11-17 12:27:45 -08:00
fib_trie.c
net: allow GFP_HIGHMEM in __vmalloc()
2010-11-21 10:04:04 -08:00
gre.c
tunnels: add _rcu annotations
2010-10-25 13:09:45 -07:00
icmp.c
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-11-19 13:13:47 -08:00
igmp.c
igmp: refine skb allocations
2010-11-18 11:02:23 -08:00
inet_connection_sock.c
net: optimize INET input path further
2010-12-09 20:05:58 -08:00
inet_diag.c
netlink: test for all flags of the NLM_F_DUMP composite
2011-01-09 16:25:03 -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
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
inetpeer.c
inetpeer: Kill use of inet_peer_address_t typedef.
2010-12-01 17:28:18 -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
ipv4: Don't pre-seed hoplimit metric.
2010-12-12 22:08:17 -08:00
ip_input.c
net: use this_cpu_ptr()
2010-06-28 23:24:29 -07:00
ip_options.c
bridge : Sanitize skb before it enters the IP stack
2010-09-19 12:42:34 -07:00
ip_output.c
ipv4: Don't pre-seed hoplimit metric.
2010-12-12 22:08:17 -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: use the macros defined for the members of flowi
2010-11-17 12:27:45 -08:00
Kconfig
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2010-10-24 13:41:39 -07:00
Makefile
PPTP: PPP over IPv4 (Point-to-Point Tunneling Protocol)
2010-08-21 23:05:39 -07:00
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: use the macros defined for the members of flowi
2010-11-17 12:27:45 -08:00
route.c
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-01-04 11:57:25 -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_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]: Cong.ctrl modules: remove unused good_ack from cong_avoid
2008-01-28 14:55:41 -08:00
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: cleanup of cwnd initialization in tcp_init_metrics()
2010-12-23 09:54:26 -08:00
tcp_ipv4.c
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-12-26 22:37:05 -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
TCP: increase default initial receive window.
2010-12-20 21:33:00 -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: use correct counters in CA_CWR state too
2010-10-17 13:46:33 -07:00
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
tcp.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
tunnel4.c
tunnels: add __rcu annotations
2010-10-27 11:37:32 -07:00
udp_impl.h
net: Make setsockopt() optlen be unsigned.
2009-09-30 16:12:20 -07:00
udp.c
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-12-17 12:27:22 -08:00
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
net: use the macros defined for the members of flowi
2010-11-17 12:27:45 -08:00
xfrm4_state.c
xfrm: Allow different selector family in temporary state
2010-09-20 11:11:38 -07:00
xfrm4_tunnel.c
net: struct xfrm_tunnel in read_mostly section
2010-08-30 13:50:45 -07:00