bridge: implement multicast fast leave

V3: make it a flag
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@gondor.apana.org.au>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>

5 files changed, 7 insertions, 21 deletions

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index bb58aeb7f34d..60f3b6b90602 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -218,6 +218,7 @@ enum {
         IFLA_BRPORT_MODE,       /* mode (hairpin)          */
         IFLA_BRPORT_GUARD,      /* bpdu guard              */
         IFLA_BRPORT_PROTECT,    /* root port protection    */
+        IFLA_BRPORT_FAST_LEAVE, /* multicast fast leave    */
         __IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 2391bae4f733..a2a7a1a79081 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1225,7 +1225,7 @@ static void br_multicast_leave_group(struct net_bridge *br,
         if (!mp)
                 goto out;
 
-        if (port && port->multicast_fast_leave) {
+        if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
                 struct net_bridge_port_group __rcu **pp;
 
                 for (pp = &mp->ports;
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 65429b99a2a3..850b7d1f3a41 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -53,7 +53,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
             nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
             nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
             nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
-            nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)))
+            nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
+            nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)))
                 return -EMSGSIZE;
 
         return 0;
@@ -210,6 +211,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 
         br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
         br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
+        br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
 
         if (tb[IFLA_BRPORT_COST]) {
                 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index cdbf9047a659..cd86222cf5e3 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -137,11 +137,11 @@ struct net_bridge_port
 #define BR_HAIRPIN_MODE         0x00000001
 #define BR_BPDU_GUARD           0x00000002
 #define BR_ROOT_BLOCK           0x00000004
+#define BR_MULTICAST_FAST_LEAVE 0x00000008
 
 #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 dc484ace0be3..a1ef1b6e14dc 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -173,24 +173,7 @@ 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);
+BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
 #endif
 
 static const struct brport_attribute *brport_attrs[] = {