linux/net/core
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
..
datagram.c net: skb_free_datagram_locked() fix 2010-05-03 23:18:14 -07:00
dev_addr_lists.c
dev.c net: add a noref bit on skb dst 2010-05-17 17:18:50 -07:00
drop_monitor.c
dst.c dst: don't inline dst_ifdown 2010-04-13 03:32:44 -07:00
ethtool.c
fib_rules.c net: fib_rules: mark arguments to fib_rules_register const and __net_initdata 2010-04-26 16:02:04 +02:00
filter.c net: Socket filter ancilliary data access for skb->dev->type 2010-04-22 16:05:44 -07:00
flow.c
gen_estimator.c
gen_stats.c
iovec.c
kmap_skb.h
link_watch.c
Makefile
neighbour.c
net_namespace.c net: disallow to use net_assign_generic externally 2010-04-27 15:49:02 -07:00
net-sysfs.c rps: static functions 2010-04-19 14:40:57 -07:00
net-sysfs.h
net-traces.c
netevent.c
netpoll.c netpoll: add generic support for bridge and bonding devices 2010-05-06 00:47:21 -07:00
pktgen.c
request_sock.c
rtnetlink.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
scm.c
skbuff.c net: add a noref bit on skb dst 2010-05-17 17:18:50 -07:00
sock.c net: add a noref bit on skb dst 2010-05-17 17:18:50 -07:00
stream.c net: sock_def_readable() and friends RCU conversion 2010-05-01 15:00:15 -07:00
sysctl_net_core.c net: Consistent skb timestamping 2010-05-15 23:57:10 -07:00
user_dma.c
utils.c