[PATCH net-next] net: dsa: add support for BRIDGE_MROUTER attribute

[Vivien Didelot <vivien.didelot@gmail.com>]

This patch adds support for enabling or disabling the flooding of
unknown multicast traffic on the CPU ports, depending on the value
of the switchdev SWITCHDEV_ATTR_ID_BRIDGE_MROUTER attribute.

The current behavior is kept unchanged but a user can now prevent
the CPU conduit to be flooded with a lot of unregistered traffic that
the network stack needs to filter in software with e.g.:

    echo 0 > /sys/class/net/br0/multicast_router

Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
---
 net/dsa/dsa_priv.h |  2 ++
 net/dsa/port.c     | 12 ++++++++++++
 net/dsa/slave.c    |  3 +++
 3 files changed, 17 insertions(+)

diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index a4853c22c2ff..d240c191392f 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -163,6 +163,8 @@ int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
 			      struct switchdev_trans *trans);
 int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
 			  struct switchdev_trans *trans);
+int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
+		     struct switchdev_trans *trans);
 int dsa_port_vlan_add(struct dsa_port *dp,
 		      const struct switchdev_obj_port_vlan *vlan,
 		      struct switchdev_trans *trans);
diff --git a/net/dsa/port.c b/net/dsa/port.c
index d2b65e8dc60c..f071acf2842b 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -261,6 +261,18 @@ int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
 	return err;
 }
 
+int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
+		     struct switchdev_trans *trans)
+{
+	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_egress_floods(ds, port, true, mrouter);
+}
+
 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 		     u16 vid)
 {
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index db58e748557d..247f3deed593 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -302,6 +302,9 @@ static int dsa_slave_port_attr_set(struct net_device *dev,
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 		ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 		break;
+	case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
+		ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
+		break;
 	default:
 		ret = -EOPNOTSUPP;
 		break;
-- 
2.22.0