mlxsw: spectrum_router: Configure matching local routes for NVE decap

When a local route that matches the source IP of an offloaded NVE tunnel
is notified, the driver needs to program it to perform NVE decapsulation
instead of merely trapping packets to the CPU.

This patch complements "mlxsw: spectrum_router: Enable local routes
promotion to perform NVE decap" where existing local routes were
promoted to perform NVE decapsulation.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Reviewed-by: NPetr Machata <petrm@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -4247,6 +4247,7 @@ mlxsw_sp_fib4_entry_type_set(struct mlxsw_sp *mlxsw_sp,
 			     struct mlxsw_sp_fib_entry *fib_entry)
 {
 	union mlxsw_sp_l3addr dip = { .addr4 = htonl(fen_info->dst) };
+	u32 tb_id = mlxsw_sp_fix_tb_id(fen_info->tb_id);
 	struct net_device *dev = fen_info->fi->fib_dev;
 	struct mlxsw_sp_ipip_entry *ipip_entry;
 	struct fib_info *fi = fen_info->fi;
@@ -4261,6 +4262,15 @@ mlxsw_sp_fib4_entry_type_set(struct mlxsw_sp *mlxsw_sp,
 							     fib_entry,
 							     ipip_entry);
 		}
+		if (mlxsw_sp_nve_ipv4_route_is_decap(mlxsw_sp, tb_id,
+						     dip.addr4)) {
+			u32 t_index;
+
+			t_index = mlxsw_sp_nve_decap_tunnel_index_get(mlxsw_sp);
+			fib_entry->decap.tunnel_index = t_index;
+			fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_NVE_DECAP;
+			return 0;
+		}
 		/* fall through */
 	case RTN_BROADCAST:
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;