realtek: Backport bridge configuration for DSA

Adds the DSA API for bridge configuration (flooding, L2 learning,
and aging) offload as found in Linux 5.12 so that we can implement
it in our drivver.

Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Signed-off-by: Birger Koblitz <git@birger-koblitz.de>

target/linux/realtek/patches-5.10/708-brflood-api.patch

+--- a/include/net/dsa.h
++++ b/include/net/dsa.h
+@@ -552,8 +552,14 @@ struct dsa_switch_ops {
+ 	void	(*port_stp_state_set)(struct dsa_switch *ds, int port,
+ 				      u8 state);
+ 	void	(*port_fast_age)(struct dsa_switch *ds, int port);
+-	int	(*port_egress_floods)(struct dsa_switch *ds, int port,
+-				      bool unicast, bool multicast);
++	int	(*port_pre_bridge_flags)(struct dsa_switch *ds, int port,
++					 unsigned long flags,
++					 struct netlink_ext_ack *extack);
++	int	(*port_bridge_flags)(struct dsa_switch *ds, int port,
++				     unsigned long flags,
++				     struct netlink_ext_ack *extack);
++	int	(*port_set_mrouter)(struct dsa_switch *ds, int port, bool mrouter,
++				    struct netlink_ext_ack *extack);
+ 
+ 	/*
+ 	 * VLAN support
+--- a/net/dsa/dsa_priv.h
++++ b/net/dsa/dsa_priv.h
+@@ -167,11 +167,11 @@ int dsa_port_mdb_add(const struct dsa_po
+ int dsa_port_mdb_del(const struct dsa_port *dp,
+ 		     const struct switchdev_obj_port_mdb *mdb);
+ int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+-			      struct switchdev_trans *trans);
++			      struct switchdev_trans *trans, struct netlink_ext_ack *extack);
+ int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+-			  struct switchdev_trans *trans);
++			  struct switchdev_trans *trans, struct netlink_ext_ack *extack);
+ int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
+-		     struct switchdev_trans *trans);
++		     struct switchdev_trans *trans, struct netlink_ext_ack *extack);
+ int dsa_port_vlan_add(struct dsa_port *dp,
+ 		      const struct switchdev_obj_port_vlan *vlan,
+ 		      struct switchdev_trans *trans);
+--- a/net/dsa/port.c
++++ b/net/dsa/port.c
+@@ -145,7 +145,7 @@ int dsa_port_bridge_join(struct dsa_port
+ 	int err;
+ 
+ 	/* Set the flooding mode before joining the port in the switch */
+-	err = dsa_port_bridge_flags(dp, BR_FLOOD | BR_MCAST_FLOOD, NULL);
++	err = dsa_port_bridge_flags(dp, BR_FLOOD | BR_MCAST_FLOOD, NULL, NULL);
+ 	if (err)
+ 		return err;
+ 
+@@ -158,7 +158,7 @@ int dsa_port_bridge_join(struct dsa_port
+ 
+ 	/* The bridging is rolled back on error */
+ 	if (err) {
+-		dsa_port_bridge_flags(dp, 0, NULL);
++		dsa_port_bridge_flags(dp, 0, NULL, NULL);
+ 		dp->bridge_dev = NULL;
+ 	}
+ 
+@@ -185,7 +185,7 @@ void dsa_port_bridge_leave(struct dsa_po
+ 		pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
+ 
+ 	/* Port is leaving the bridge, disable flooding */
+-	dsa_port_bridge_flags(dp, 0, NULL);
++	dsa_port_bridge_flags(dp, 0, NULL, NULL);
+ 
+ 	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
+ 	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
+@@ -333,44 +333,44 @@ int dsa_port_ageing_time(struct dsa_port
+ }
+ 
+ int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+-			      struct switchdev_trans *trans)
++			      struct switchdev_trans *trans, struct netlink_ext_ack *extack)
+ {
+ 	struct dsa_switch *ds = dp->ds;
+ 
+-	if (!ds->ops->port_egress_floods ||
+-	    (flags & ~(BR_FLOOD | BR_MCAST_FLOOD)))
++	if (!ds->ops->port_pre_bridge_flags)
+ 		return -EINVAL;
+ 
+-	return 0;
++	return ds->ops->port_pre_bridge_flags(ds, dp->index, flags, extack);
+ }
+ 
+ int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+-			  struct switchdev_trans *trans)
++			  struct switchdev_trans *trans, struct netlink_ext_ack *extack)
+ {
+ 	struct dsa_switch *ds = dp->ds;
+-	int port = dp->index;
+-	int err = 0;
+ 
+ 	if (switchdev_trans_ph_prepare(trans))
+ 		return 0;
+ 
+-	if (ds->ops->port_egress_floods)
+-		err = ds->ops->port_egress_floods(ds, port, flags & BR_FLOOD,
+-						  flags & BR_MCAST_FLOOD);
++	if (!ds->ops->port_bridge_flags)
++		return -EINVAL;
++ 
++	return ds->ops->port_bridge_flags(ds, dp->index, flags, extack);
+ 
+-	return err;
+ }
+ 
+ int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
+-		     struct switchdev_trans *trans)
++		     struct switchdev_trans *trans,
++		     struct netlink_ext_ack *extack)
+ {
+ 	struct dsa_switch *ds = dp->ds;
+-	int port = dp->index;
+ 
+ 	if (switchdev_trans_ph_prepare(trans))
+-		return ds->ops->port_egress_floods ? 0 : -EOPNOTSUPP;
++		return ds->ops->port_set_mrouter ? 0 : -EOPNOTSUPP;
++
++	if (!ds->ops->port_set_mrouter)
++ 		return -EOPNOTSUPP;
+ 
+-	return ds->ops->port_egress_floods(ds, port, true, mrouter);
++	return ds->ops->port_set_mrouter(ds, dp->index, mrouter, extack);
+ }
+ 
+ int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
+--- a/net/dsa/slave.c
++++ b/net/dsa/slave.c
+@@ -290,13 +290,13 @@ static int dsa_slave_port_attr_set(struc
+ 		break;
+ 	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
+ 		ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
+-						trans);
++						trans, NULL);
+ 		break;
+ 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
+-		ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
++		ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans, NULL);
+ 		break;
+ 	case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
+-		ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
++		ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans, NULL);
+ 		break;
+ 	default:
+ 		ret = -EOPNOTSUPP;