linux.git/include/net/udp.h, branch v2.6.29

udp: Use hlist_nulls in UDP RCU code

2008-11-17T03:39:21+00:00

This is a straightforward patch, using hlist_nulls infrastructure.

RCUification already done on UDP two weeks ago.

Using hlist_nulls permits us to avoid some memory barriers, both
at lookup time and delete time.

Patch is large because it adds new macros to include/net/sock.h.
These macros will be used by TCP & DCCP in next patch.

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

udp: introduce struct udp_table and multiple spinlocks

2008-10-29T08:41:45+00:00

UDP sockets are hashed in a 128 slots hash table.

This hash table is protected by *one* rwlock.

This rwlock is readlocked each time an incoming UDP message is handled.

This rwlock is writelocked each time a socket must be inserted in
hash table (bind time), or deleted from this table (close time)

This is not scalable on SMP machines :

1) Even in read mode, lock() and unlock() are atomic operations and
 must dirty a contended cache line, shared by all cpus.

2) A writer might be starved if many readers are 'in flight'. This can
 happen on a machine with some NIC receiving many UDP messages. User
 process can be delayed a long time at socket creation/dismantle time.

This patch prepares RCU migration, by introducing 'struct udp_table
and struct udp_hslot', and using one spinlock per chain, to reduce
contention on central rwlock.

Introducing one spinlock per chain reduces latencies, for port
randomization on heavily loaded UDP servers. This also speedup
bindings to specific ports.

udp_lib_unhash() was uninlined, becoming to big.

Some cleanups were done to ease review of following patch
(RCUification of UDP Unicast lookups)

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

netns: make uplitev6 mib per/namespace

2008-10-07T21:50:06+00:00

Signed-off-by: Denis V. Lunev 
Signed-off-by: David S. Miller

netns: make udpv6 mib per/namespace

2008-10-07T21:49:36+00:00

Signed-off-by: Denis V. Lunev 
Signed-off-by: David S. Miller

udp: Export UDP socket lookup function

2008-10-01T14:48:10+00:00

The iptables tproxy code has to be able to do UDP socket hash lookups,
so we have to provide an exported lookup function for this purpose.

Signed-off-by: KOVACS Krisztian 
Signed-off-by: David S. Miller

mib: put udplite statistics on struct net

2008-07-18T11:03:45+00:00

Signed-off-by: Pavel Emelyanov 
Signed-off-by: David S. Miller

mib: put udp statistics on struct net

2008-07-18T11:03:27+00:00

Similar to... ouch, I repeat myself.

Signed-off-by: Pavel Emelyanov 
Signed-off-by: David S. Miller

MIB: add struct net to UDP6_INC_STATS_BH

2008-07-06T04:19:40+00:00

Signed-off-by: Pavel Emelyanov 
Acked-by: Denis V. Lunev 
Signed-off-by: David S. Miller

MIB: add struct net to UDP6_INC_STATS_USER

2008-07-06T04:19:20+00:00

As simple as the patch #1 in this set.

Signed-off-by: Pavel Emelyanov 
Acked-by: Denis V. Lunev 
Signed-off-by: David S. Miller

MIB: add struct net to UDP_INC_STATS_BH

2008-07-06T04:18:48+00:00

Two special cases here - one is rxrpc - I put init_net there
explicitly, since we haven't touched this part yet. The second
place is in __udp4_lib_rcv - we already have a struct net there,
but I have to move its initialization above to make it ready
at the "drop" label.

Signed-off-by: Pavel Emelyanov 
Acked-by: Denis V. Lunev 
Signed-off-by: David S. Miller