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igmp: hash a hash table to speedup ip_check_mc_rcu()

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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>
This commit is contained in:
Eric Dumazet 2013-06-07 08:48:57 -07:00 • committed by David S. Miller
parent 64153ce0a7
commit e989707135
4 changed files with 77 additions and 3 deletions
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5
include/linux/inetdevice.h
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@ -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;