V2: make the toggle per-port
Fast leave allows bridge to immediately stops the multicast
traffic on the port receives IGMP Leave when IGMP snooping is enabled,
no timeouts are observed.
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Stephen Hemminger <shemminger@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: Cong Wang <amwang@xxxxxxxxxx>
---
net/bridge/br_multicast.c | 21 +++++++++++++++++++++
net/bridge/br_private.h | 1 +
net/bridge/br_sysfs_if.c | 20 ++++++++++++++++++++
3 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index d53e4f4..02da618 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1226,6 +1226,27 @@ static void br_multicast_leave_group(struct net_bridge *br,
if (!mp)
goto out;
+ if (port && port->multicast_fast_leave) {
+ struct net_bridge_port_group __rcu **pp;
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (p->port != port)
+ continue;
+
+ rcu_assign_pointer(*pp, p->next);
+ hlist_del_init(&p->mglist);
+ del_timer(&p->timer);
+ call_rcu_bh(&p->rcu, br_multicast_free_pg);
+
+ if (!mp->ports && !mp->mglist &&
+ netif_running(br->dev))
+ mod_timer(&mp->timer, jiffies);
+ }
+ goto out;
+ }
+
now = jiffies;
time = now + br->multicast_last_member_count *
br->multicast_last_member_interval;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 6484069..8f0e789 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -142,6 +142,7 @@ struct net_bridge_port
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
u32 multicast_startup_queries_sent;
unsigned char multicast_router;
+ unsigned char multicast_fast_leave;
struct timer_list multicast_router_timer;
struct timer_list multicast_query_timer;
struct hlist_head mglist;
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index 7ff95ba..dc484ac 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -172,6 +172,25 @@ static int store_multicast_router(struct net_bridge_port *p,
}
static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
store_multicast_router);
+
+static ssize_t show_multicast_fast_leave(struct net_bridge_port *p,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", p->multicast_fast_leave);
+}
+
+static int store_multicast_fast_leave(struct net_bridge_port *p,
+ unsigned long v)
+{
+ if (p->br->multicast_disabled)
+ return -EINVAL;
+
+ p->multicast_fast_leave = !!v;
+ return 0;
+}
+
+static BRPORT_ATTR(multicast_fast_leave, S_IRUGO | S_IWUSR,
+ show_multicast_fast_leave, store_multicast_fast_leave);
#endif
static const struct brport_attribute *brport_attrs[] = {
@@ -195,6 +214,7 @@ static const struct brport_attribute *brport_attrs[] = {
&brport_attr_root_block,
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
&brport_attr_multicast_router,
+ &brport_attr_multicast_fast_leave,
#endif
NULL
};
