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Eric Dumazet e67f88dd12 net: dont hold rtnl mutex during netlink dump callbacks 
Four years ago, Patrick made a change to hold rtnl mutex during netlink
dump callbacks.

I believe it was a wrong move. This slows down concurrent dumps, making
good old /proc/net/ files faster than rtnetlink in some situations.

This occurred to me because one "ip link show dev ..." was _very_ slow
on a workload adding/removing network devices in background.

All dump callbacks are able to use RCU locking now, so this patch does
roughly a revert of commits :

1c2d670f36 : [RTNETLINK]: Hold rtnl_mutex during netlink dump callbacks
6313c1e099 : [RTNETLINK]: Remove unnecessary locking in dump callbacks

This let writers fight for rtnl mutex and readers going full speed.

It also takes care of phonet : phonet_route_get() is now called from rcu
read section. I renamed it to phonet_route_get_rcu()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2011-05-02 15:26:28 -07:00
..
netfilter Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2011-04-19 11:24:06 -07:00
Kconfig ipv6: ip6mr: support multiple tables 2010-05-11 14:40:55 +02:00
Makefile [IPV6] MROUTE: Support multicast forwarding. 2008-04-05 22:33:38 +09:00
addrconf.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
addrconf_core.c ipv6: Remove IPV6_ADDR_RESERVED 2010-02-26 03:59:07 -08:00
addrlabel.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-09-27 01:03:03 -07:00
af_inet6.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ah6.c xfrm: Use separate low and high order bits of the sequence numbers in xfrm_skb_cb 2011-03-13 20:22:28 -07:00
anycast.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
datagram.c net: Put fl6_* macros to struct flowi6 and use them again. 2011-03-12 15:08:55 -08:00
esp6.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
exthdrs.c ipv6: Convert to use flowi6 where applicable. 2011-03-12 15:08:54 -08:00
exthdrs_core.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
fib6_rules.c ipv6: Convert to use flowi6 where applicable. 2011-03-12 15:08:54 -08:00
icmp.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
inet6_connection_sock.c Revert "tcp: disallow bind() to reuse addr/port" 2011-04-13 12:01:14 -07:00
inet6_hashtables.c Kill off warning: ‘inline’ is not at beginning of declaration 2011-01-19 15:43:08 +01:00
ip6_fib.c net: dont hold rtnl mutex during netlink dump callbacks 2011-05-02 15:26:28 -07:00
ip6_flowlabel.c ipv6: Convert to use flowi6 where applicable. 2011-03-12 15:08:54 -08:00
ip6_input.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ip6_output.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ip6_tunnel.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ip6mr.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ipcomp6.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ipv6_sockglue.c ipv6: Convert to use flowi6 where applicable. 2011-03-12 15:08:54 -08:00
mcast.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
mip6.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ndisc.c ipv4, ipv6, bonding: Restore control over number of peer notifications 2011-04-29 12:44:11 -07:00
netfilter.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
proc.c ipv6/udp: report SndbufErrors and RcvbufErrors 2010-10-30 16:17:23 -07:00
protocol.c net: add __rcu annotations to protocol 2010-10-27 11:37:31 -07:00
raw.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
reassembly.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
route.c net: Use non-zero allocations in dst_alloc(). 2011-04-28 22:26:00 -07:00
sit.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
syncookies.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
sysctl_net_ipv6.c net ipv6: Fix duplicate /proc/sys/net/ipv6/neigh directory entries. 2011-03-21 18:23:34 -07:00
tcp_ipv6.c inet: add RCU protection to inet->opt 2011-04-28 13:16:35 -07:00
tunnel6.c tunnels: add _rcu annotations 2010-10-25 13:09:45 -07:00
udp.c net:use help function of skb_checksum_start_offset to calculate offset 2011-04-28 13:28:57 -07:00
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
xfrm6_input.c netfilter: ipv6: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:49 +01:00
xfrm6_mode_beet.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
xfrm6_mode_ro.c [IPSEC]: Make x->lastused an unsigned long 2008-01-28 14:53:52 -08:00
xfrm6_mode_transport.c [IPSEC]: Use IPv6 calling convention as the convention for x->mode->output 2007-10-10 16:55:54 -07:00
xfrm6_mode_tunnel.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
xfrm6_output.c ipv6: Fragment locally generated tunnel-mode IPSec6 packets as needed. 2010-12-19 20:22:23 -08:00
xfrm6_policy.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
xfrm6_state.c net: Use flowi4 and flowi6 in xfrm layer. 2011-03-12 15:08:52 -08:00
xfrm6_tunnel.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00