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authorEric Dumazet <edumazet@google.com>2013-06-07 19:48:57 +0400
committerDavid S. Miller <davem@davemloft.net>2013-06-12 11:25:23 +0400
commite9897071350bd9d94a56b5b6f79c85b1a98fc7e7 (patch)
treed01026afb4450ef685722cd7a0fe1815336170ca /include/linux/inetdevice.h
parent64153ce0a7b61b2a5cacb01805cbf670142339e9 (diff)
downloadlinux-e9897071350bd9d94a56b5b6f79c85b1a98fc7e7.tar.xz
igmp: hash a hash table to speedup ip_check_mc_rcu()
After IP route cache removal, multicast applications using a lot of multicast addresses hit a O(N) behavior in ip_check_mc_rcu() Add a per in_device hash table to get faster lookup. This hash table is created only if the number of items in mc_list is above 4. Reported-by: Shawn Bohrer <sbohrer@rgmadvisors.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Tested-by: Shawn Bohrer <sbohrer@rgmadvisors.com> Reviewed-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/inetdevice.h')
-rw-r--r--include/linux/inetdevice.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index ea1e3b863890..b99cd23f3474 100644
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -50,12 +50,17 @@ struct ipv4_devconf {
DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
};
+#define MC_HASH_SZ_LOG 9
+
struct in_device {
struct net_device *dev;
atomic_t refcnt;
int dead;
struct in_ifaddr *ifa_list; /* IP ifaddr chain */
+
struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */
+ struct ip_mc_list __rcu * __rcu *mc_hash;
+
int mc_count; /* Number of installed mcasts */
spinlock_t mc_tomb_lock;
struct ip_mc_list *mc_tomb;