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remarkable-linux/net/ipv4
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Eric Dumazet 7fee226ad2 net: add a noref bit on skb dst 
Use low order bit of skb->_skb_dst to tell dst is not refcounted.

Change _skb_dst to _skb_refdst to make sure all uses are catched.

skb_dst() returns the dst, regardless of noref bit set or not, but
with a lockdep check to make sure a noref dst is not given if current
user is not rcu protected.

New skb_dst_set_noref() helper to set an notrefcounted dst on a skb.
(with lockdep check)

skb_dst_drop() drops a reference only if skb dst was refcounted.

skb_dst_force() helper is used to force a refcount on dst, when skb
is queued and not anymore RCU protected.

Use skb_dst_force() in __sk_add_backlog(), __dev_xmit_skb() if
!IFF_XMIT_DST_RELEASE or skb enqueued on qdisc queue, in
sock_queue_rcv_skb(), in __nf_queue().

Use skb_dst_force() in dev_requeue_skb().

Note: dst_use_noref() still dirties dst, we might transform it
later to do one dirtying per jiffies.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17 17:18:50 -07:00
..
netfilter netfilter: remove unnecessary returns from void function()s 2010-05-13 15:16:27 +02:00
af_inet.c net: reserve ports for applications using fixed port numbers 2010-05-15 23:28:40 -07:00
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: Fix FDDI and TR config checks in ipv4 arp and LLC. 2010-05-10 04:59:07 -07:00
cipso_ipv4.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
datagram.c
devinet.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00
esp4.c
fib_frontend.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
fib_hash.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
fib_lookup.h
fib_rules.c net: rtnetlink: decouple rtnetlink address families from real address families 2010-04-26 16:13:54 +02:00
fib_semantics.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
fib_trie.c fib: suppress lockdep-RCU false positive in FIB trie. 2010-04-14 16:13:29 -07:00
icmp.c net: add a noref bit on skb dst 2010-05-17 17:18:50 -07:00
igmp.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00
inet_connection_sock.c net: reserve ports for applications using fixed port numbers 2010-05-15 23:28:40 -07:00
inet_diag.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
inet_fragment.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
inet_hashtables.c net: reserve ports for applications using fixed port numbers 2010-05-15 23:28:40 -07:00
inet_lro.c
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
ip_forward.c Merge branch 'master' of /repos/git/net-next-2.6 2010-04-20 16:02:01 +02:00
ip_fragment.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
ip_gre.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
ip_input.c Merge branch 'master' of /repos/git/net-next-2.6 2010-04-20 16:02:01 +02:00
ip_options.c net: add a noref bit on skb dst 2010-05-17 17:18:50 -07:00
ip_output.c Merge branch 'master' of /repos/git/net-next-2.6 2010-05-10 18:39:28 +02:00
ip_sockglue.c net: ip_queue_rcv_skb() helper 2010-04-28 15:31:51 -07:00
ipcomp.c
ipconfig.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00
ipip.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
ipmr.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-05-12 00:05:35 -07:00
Kconfig ipv4: ipmr: fix IP_MROUTE_MULTIPLE_TABLES Kconfig dependencies 2010-04-15 13:31:29 +02:00
Makefile
netfilter.c net: add a noref bit on skb dst 2010-05-17 17:18:50 -07:00
proc.c tcp: Add SNMP counter for DEFER_ACCEPT 2010-03-21 18:31:35 -07:00
protocol.c
raw.c Merge branch 'master' of /repos/git/net-next-2.6 2010-05-10 18:39:28 +02:00
route.c net: add a noref bit on skb dst 2010-05-17 17:18:50 -07:00
syncookies.c
sysctl_net_ipv4.c net: reserve ports for applications using fixed port numbers 2010-05-15 23:28:40 -07:00
tcp.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-05-16 22:26:58 -07:00
tcp_bic.c
tcp_cong.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
tcp_cubic.c
tcp_diag.c
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c net: ip_queue_rcv_skb() helper 2010-04-28 15:31:51 -07:00
tcp_ipv4.c net: Introduce sk_route_nocaps 2010-05-16 00:36:33 -07:00
tcp_lp.c
tcp_minisocks.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00
tcp_output.c net: Introduce sk_route_nocaps 2010-05-16 00:36:33 -07:00
tcp_probe.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
tcp_scalable.c
tcp_timer.c TCP: avoid to send keepalive probes if receiving data 2010-04-27 12:53:25 -07:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tunnel4.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
udp.c net: reserve ports for applications using fixed port numbers 2010-05-15 23:28:40 -07:00
udp_impl.h
udplite.c
xfrm4_input.c Merge branch 'master' of /repos/git/net-next-2.6 2010-04-20 16:02:01 +02:00
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.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
xfrm4_output.c netfilter: ipv4: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:30 +01:00
xfrm4_policy.c xfrm: cache bundles instead of policies for outgoing flows 2010-04-07 03:43:19 -07:00
xfrm4_state.c
xfrm4_tunnel.c