switchdev: bridge: Offload mc router ports

Offload the mc router ports list, whenever it is being changed.
It is done because in some cases mc packets needs to be flooded to all
the ports in this list.

Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/switchdev.h

@@ -46,6 +46,7 @@ enum switchdev_attr_id {
 	SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 	SWITCHDEV_ATTR_ID_PORT_STP_STATE,
 	SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
+	SWITCHDEV_ATTR_ID_PORT_MROUTER,
 	SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
 	SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 	SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
@@ -61,6 +62,7 @@ struct switchdev_attr {
 		struct netdev_phys_item_id ppid;	/* PORT_PARENT_ID */
 		u8 stp_state;				/* PORT_STP_STATE */
 		unsigned long brport_flags;		/* PORT_BRIDGE_FLAGS */
+		bool mrouter;				/* PORT_MROUTER */
 		clock_t ageing_time;			/* BRIDGE_AGEING_TIME */
 		bool vlan_filtering;			/* BRIDGE_VLAN_FILTERING */
 		bool mc_disabled;			/* MC_DISABLED */

net/bridge/br_multicast.c

@@ -1317,6 +1317,19 @@ br_multicast_update_query_timer(struct net_bridge *br,
 	mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
 }
 
+static void br_port_mc_router_state_change(struct net_bridge_port *p,
+					   bool is_mc_router)
+{
+	struct switchdev_attr attr = {
+		.orig_dev = p->dev,
+		.id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
+		.flags = SWITCHDEV_F_DEFER,
+		.u.mrouter = is_mc_router,
+	};
+
+	switchdev_port_attr_set(p->dev, &attr);
+}
+
 /*
  * Add port to router_list
  *  list is maintained ordered by pointer value
@@ -1342,6 +1355,7 @@ static void br_multicast_add_router(struct net_bridge *br,
 	else
 		hlist_add_head_rcu(&port->rlist, &br->router_list);
 	br_rtr_notify(br->dev, port, RTM_NEWMDB);
+	br_port_mc_router_state_change(port, true);
 }
 
 static void br_multicast_mark_router(struct net_bridge *br,
@@ -2049,6 +2063,7 @@ static void __del_port_router(struct net_bridge_port *p)
 		return;
 	hlist_del_init_rcu(&p->rlist);
 	br_rtr_notify(p->br->dev, p, RTM_DELMDB);
+	br_port_mc_router_state_change(p, false);
 
 	/* don't allow timer refresh */
 	if (p->multicast_router == MDB_RTR_TYPE_TEMP)