mlxsw: spectrum_router: Flood unregistered multicast packets to router

Up until now we only flooded broadcast packets to the router when an L3
interface was configured on top of a bridge. However, IPv6 Neighbour
Discovery packets are trapped to the CPU inside the router and these can
be sent with a multicast address.

Flood unregistered multicast packets to the router port, so that
relevant packets could be trapped there.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -3558,6 +3558,11 @@ static int mlxsw_sp_rif_vlan_configure(struct mlxsw_sp_rif *rif)
 	if (err)
 		return err;
 
+	err = mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
+				     mlxsw_sp_router_port(mlxsw_sp), true);
+	if (err)
+		goto err_fid_mc_flood_set;
+
 	err = mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 				     mlxsw_sp_router_port(mlxsw_sp), true);
 	if (err)
@@ -3566,6 +3571,9 @@ static int mlxsw_sp_rif_vlan_configure(struct mlxsw_sp_rif *rif)
 	return 0;
 
 err_fid_bc_flood_set:
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
+err_fid_mc_flood_set:
 	mlxsw_sp_rif_vlan_fid_op(rif, MLXSW_REG_RITR_VLAN_IF, vid, false);
 	return err;
 }
@@ -3577,6 +3585,8 @@ static void mlxsw_sp_rif_vlan_deconfigure(struct mlxsw_sp_rif *rif)
 
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
 	mlxsw_sp_rif_vlan_fid_op(rif, MLXSW_REG_RITR_VLAN_IF, vid, false);
 }
 
@@ -3607,6 +3617,11 @@ static int mlxsw_sp_rif_fid_configure(struct mlxsw_sp_rif *rif)
 	if (err)
 		return err;
 
+	err = mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
+				     mlxsw_sp_router_port(mlxsw_sp), true);
+	if (err)
+		goto err_fid_mc_flood_set;
+
 	err = mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 				     mlxsw_sp_router_port(mlxsw_sp), true);
 	if (err)
@@ -3615,6 +3630,9 @@ static int mlxsw_sp_rif_fid_configure(struct mlxsw_sp_rif *rif)
 	return 0;
 
 err_fid_bc_flood_set:
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
+err_fid_mc_flood_set:
 	mlxsw_sp_rif_vlan_fid_op(rif, MLXSW_REG_RITR_FID_IF, fid_index, false);
 	return err;
 }
@@ -3626,6 +3644,8 @@ static void mlxsw_sp_rif_fid_deconfigure(struct mlxsw_sp_rif *rif)
 
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
 	mlxsw_sp_rif_vlan_fid_op(rif, MLXSW_REG_RITR_FID_IF, fid_index, false);
 }