diff options
Diffstat (limited to 'net/bridge/br_multicast.c')
| -rw-r--r-- | net/bridge/br_multicast.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index c7a1095ed84..2559fb53983 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -15,6 +15,7 @@ #include <linux/igmp.h> #include <linux/jhash.h> #include <linux/kernel.h> +#include <linux/log2.h> #include <linux/netdevice.h> #include <linux/netfilter_bridge.h> #include <linux/random.h> @@ -1261,3 +1262,43 @@ unlock: return err; } + +int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) +{ + int err = -ENOENT; + u32 old; + + spin_lock(&br->multicast_lock); + if (!netif_running(br->dev)) + goto unlock; + + err = -EINVAL; + if (!is_power_of_2(val)) + goto unlock; + if (br->mdb && val < br->mdb->size) + goto unlock; + + err = 0; + + old = br->hash_max; + br->hash_max = val; + + if (br->mdb) { + if (br->mdb->old) { + err = -EEXIST; +rollback: + br->hash_max = old; + goto unlock; + } + + err = br_mdb_rehash(&br->mdb, br->hash_max, + br->hash_elasticity); + if (err) + goto rollback; + } + +unlock: + spin_unlock(&br->multicast_lock); + + return err; +} |