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Eric Dumazet b6c6712a42 net: sk_dst_cache RCUification 
With latest CONFIG_PROVE_RCU stuff, I felt more comfortable to make this
work.

sk->sk_dst_cache is currently protected by a rwlock (sk_dst_lock)

This rwlock is readlocked for a very small amount of time, and dst
entries are already freed after RCU grace period. This calls for RCU
again :)

This patch converts sk_dst_lock to a spinlock, and use RCU for readers.

__sk_dst_get() is supposed to be called with rcu_read_lock() or if
socket locked by user, so use appropriate rcu_dereference_check()
condition (rcu_read_lock_held() || sock_owned_by_user(sk))

This patch avoids two atomic ops per tx packet on UDP connected sockets,
for example, and permits sk_dst_lock to be much less dirtied.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2010-04-13 01:41:33 -07:00
..
9p 9p: Make sure we are able to clunk the cached fid on umount 2010-04-05 10:37:36 -05:00
bluetooth Bluetooth: Convert debug files to actually use debugfs instead of sysfs 2010-03-21 05:49:35 +01:00
caif net-caif: add CAIF Link layer device header files 2010-03-30 19:08:45 -07:00
irda tree-wide: fix typos "ass?o[sc]iac?te" -> "associate" in comments 2010-02-15 15:38:10 +01:00
iucv 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
netfilter 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
netns packet: convert socket list to RCU (v3) 2010-02-22 15:45:56 -08:00
phonet Phonet: zero-copy GPRS TX 2010-01-07 00:24:55 -08:00
sctp net: snmp mib cleanup 2010-03-21 18:34:16 -07:00
tc_act pkt_sched: skbedit add support for setting mark 2009-10-22 21:56:42 -07:00
tipc tipc: Remove unneeded parameter to tipc_createport_raw() 2008-07-14 22:42:19 -07:00
act_api.h net: restore gnet_stats_basic to previous definition 2009-08-17 21:33:49 -07:00
addrconf.h net: Add checking to rcu_dereference() primitives 2010-02-25 09:41:03 +01:00
af_ieee802154.h af_ieee802154: add support for WANT_ACK socket option 2009-08-12 21:54:50 -07:00
af_rxrpc.h
…
af_unix.h net: Fix soft lockups/OOM issues w/ unix garbage collector 2008-11-26 15:32:27 -08:00
ah.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
arp.h net: make neigh_ops constant 2009-09-01 17:40:57 -07:00
atmclip.h clip: convert to internal network_device_stats 2009-01-21 14:01:59 -08:00
ax25.h 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
ax88796.h ax88796: Add method to take MAC from platform data 2009-03-24 23:32:03 -07:00
cfg80211.h cfg80211: Add connection quality monitoring support to nl80211 2010-03-24 16:02:37 -04:00
checksum.h include/net net/ - csum_partial - remove unnecessary casts 2008-11-19 15:44:53 -08:00
cipso_ipv4.h netlabel: Label incoming TCP connections correctly in SELinux 2009-03-28 15:01:36 +11:00
compat.h net: fix compat_sys_recvmmsg parameter type 2009-12-11 15:07:56 -08:00
datalink.h
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dcbnl.h dcbnl: Add support for setapp/getapp to netdev dcbnl_rtnl_ops 2009-09-01 01:24:30 -07:00
dn.h decnet: compile fix for removal of byteorder wrapper 2008-11-27 23:04:13 -08:00
dn_dev.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2009-12-08 07:55:01 -08:00
dn_fib.h decnet: Remove unused FIB metric macros. 2010-03-27 19:23:46 -07:00
dn_neigh.h
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dn_nsp.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
dn_route.h
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dsa.h dsa: add switch chip cascading support 2009-03-21 19:06:54 -07:00
dsfield.h
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dst.h net: sk_dst_cache RCUification 2010-04-13 01:41:33 -07:00
dst_ops.h netns: embed ip6_dst_ops directly 2009-09-01 17:40:31 -07:00
esp.h
…
ethoc.h net: Add support for the OpenCores 10/100 Mbps Ethernet MAC. 2009-03-27 00:16:21 -07:00
fib_rules.h 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
flow.h flow: virtualize flow cache entry methods 2010-04-07 03:43:18 -07:00
garp.h vlan: Add GVRP support 2008-07-05 21:26:57 -07:00
gen_stats.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
genetlink.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
icmp.h icmp: move icmp_err_convert[] to .rodata 2010-01-23 01:21:28 -08:00
ieee80211_radiotap.h wireless: update radiotap parser 2010-02-08 16:50:53 -05:00
ieee802154.h ieee802154: move headers out of extra directory 2009-07-23 17:08:51 +04:00
ieee802154_netdev.h ieee802154: add an mlme_ops call to retrieve PHY object 2009-11-06 14:32:18 +03:00
if_inet6.h ipv6: convert idev_list to list macros 2010-03-20 15:45:09 -07:00
inet6_connection_sock.h
…
inet6_hashtables.h tcp: Fix a connect() race with timewait sockets 2009-12-08 20:17:51 -08:00
inet_common.h
…
inet_connection_sock.h inet: Remove unused send_check length argument 2010-04-11 15:29:09 -07:00
inet_ecn.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
inet_frag.h inet fragments: fix sparse warning: context imbalance 2009-02-26 23:13:35 -08:00
inet_hashtables.h tcp: Fix a connect() race with timewait sockets 2009-12-08 20:17:51 -08:00
inet_sock.h tcp: Generalized TTL Security Mechanism 2010-01-11 16:28:01 -08:00
inet_timewait_sock.h tcp: Fix a connect() race with timewait sockets 2009-12-08 20:17:51 -08:00
inetpeer.h inetpeer: Optimize inet_getid() 2009-11-13 20:46:58 -08:00
ip.h percpu: add __percpu sparse annotations to net 2010-02-16 23:05:38 -08:00
ip6_checksum.h
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ip6_fib.h ipv6 fib: Make rt6_info{} more cache-line aware. 2010-04-01 18:41:41 -07:00
ip6_route.h net: sk_dst_cache RCUification 2010-04-13 01:41:33 -07:00
ip6_tunnel.h ipv6 ip6_tunnel: eliminate unused recursion field from ip6_tnl{}. 2010-03-10 07:32:29 -08:00
ip_fib.h Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-11-06 00:55:55 -08:00
ip_vs.h ipvs: SCTP Trasport Loadbalancing Support 2010-02-18 12:31:05 +01:00
ipcomp.h percpu: add __percpu sparse annotations to net 2010-02-16 23:05:38 -08:00
ipconfig.h
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ipip.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
ipv6.h ipv6: Use __fls() instead of fls() in __ipv6_addr_diff(). 2010-03-30 23:28:46 -07:00
ipx.h 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
iw_handler.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
lapb.h
…
lib80211.h wireless: missing include in lib80211.h 2008-11-21 11:42:55 -05:00
llc.h llc: convert llc_sap_list to RCU 2009-12-26 20:46:28 -08:00
llc_c_ac.h
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llc_c_ev.h
…
llc_c_st.h
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llc_conn.h llc: use a device based hash table to speed up multicast delivery 2009-12-26 20:43:57 -08:00
llc_if.h
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llc_pdu.h
…
llc_s_ac.h
…
llc_s_ev.h
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llc_s_st.h
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llc_sap.h
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mac80211.h net: convert multicast list to list_head 2010-04-03 14:22:15 -07:00
mip6.h
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ndisc.h sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
neighbour.h percpu: add __percpu sparse annotations to net 2010-02-16 23:05:38 -08:00
net_namespace.h nsproxy: remove INIT_NSPROXY() 2010-03-12 15:52:40 -08:00
netdma.h net_dma: convert to dma_find_channel 2009-01-06 11:38:15 -07:00
netevent.h
…
netlabel.h 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
netlink.h netlink: fix unaligned access in nla_get_be64() 2010-03-19 22:47:23 -07:00
netrom.h 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
nexthop.h
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nl802154.h ieee802154: add support for channel pages from IEEE 802.15.4-2006 2009-08-19 23:08:22 +04:00
p8022.h
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pkt_cls.h net: rename skb->iif to skb->skb_iif 2009-11-20 15:35:04 -08:00
pkt_sched.h gen_estimator: deadlock fix 2010-04-01 18:38:48 -07:00
protocol.h net: drop capability from protocol definitions 2009-11-05 21:40:17 -08:00
psnap.h snap: use const for descriptor 2009-03-21 19:06:50 -07:00
raw.h
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rawv6.h ipv6: Use correct data types for ICMPv6 type and code 2009-06-23 04:31:07 -07:00
red.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
regulatory.h cfg80211: add regulatory hint disconnect support 2010-02-01 15:40:06 -05:00
request_sock.h tcp: account SYN-ACK timeouts & retransmissions 2010-01-17 19:09:39 -08:00
rose.h NET: ROSE: Don't use static buffer. 2009-07-26 19:11:14 -07:00
route.h percpu: add __percpu sparse annotations to net 2010-02-16 23:05:38 -08:00
rtnetlink.h rtnetlink: support specifying device flags on device creation 2010-02-27 02:43:40 -08:00
sch_generic.h gen_estimator: deadlock fix 2010-04-01 18:38:48 -07:00
scm.h net: cleanup include/net 2009-11-04 05:06:25 -08:00
slhc_vj.h
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snmp.h net: snmp mib cleanup 2010-03-21 18:34:16 -07:00
sock.h net: sk_dst_cache RCUification 2010-04-13 01:41:33 -07:00
stp.h net: Add STP demux layer 2008-07-05 21:25:39 -07:00
tcp.h inet: Remove unused send_check length argument 2010-04-11 15:29:09 -07:00
tcp_states.h
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timewait_sock.h net: Fix memory leak in the proto_register function 2008-11-21 16:45:22 -08:00
transp_v6.h inet: inet_connection_sock_af_ops const 2009-09-02 01:03:49 -07:00
udp.h udp: bind() optimisation 2009-11-10 20:54:38 -08:00
udplite.h udp: introduce struct udp_table and multiple spinlocks 2008-10-29 01:41:45 -07:00
wext.h wext: refactor 2009-10-07 16:39:43 -04:00
wimax.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
wpan-phy.h ieee802154: add support for creation/removal of logic interfaces 2009-11-06 14:32:24 +03:00
x25.h Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2010-04-11 02:44:30 -07:00
x25device.h
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xfrm.h Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00