mlxsw: spectrum_router: Use eXtended mezzanine to offload IPv4 router

In case the eXtended mezzanine is present on the system, use it for IPv4
router offload.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -9213,7 +9213,9 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_xm_init;
 
-	router->proto_ll_ops[MLXSW_SP_L3_PROTO_IPV4] = &mlxsw_sp_router_ll_basic_ops;
+	router->proto_ll_ops[MLXSW_SP_L3_PROTO_IPV4] = mlxsw_sp_router_xm_ipv4_is_supported(mlxsw_sp) ?
+						       &mlxsw_sp_router_ll_xm_ops :
+						       &mlxsw_sp_router_ll_basic_ops;
 	router->proto_ll_ops[MLXSW_SP_L3_PROTO_IPV6] = &mlxsw_sp_router_ll_basic_ops;
 
 	err = mlxsw_sp_router_ll_op_ctx_init(router);

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

@@ -227,5 +227,6 @@ extern const struct mlxsw_sp_router_ll_ops mlxsw_sp_router_ll_xm_ops;
 
 int mlxsw_sp_router_xm_init(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_router_xm_fini(struct mlxsw_sp *mlxsw_sp);
+bool mlxsw_sp_router_xm_ipv4_is_supported(const struct mlxsw_sp *mlxsw_sp);
 
 #endif /* _MLXSW_ROUTER_H_*/

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

@@ -803,3 +803,10 @@ void mlxsw_sp_router_xm_fini(struct mlxsw_sp *mlxsw_sp)
 	rhashtable_destroy(&router_xm->ltable_ht);
 	kfree(router_xm);
 }
+
+bool mlxsw_sp_router_xm_ipv4_is_supported(const struct mlxsw_sp *mlxsw_sp)
+{
+	struct mlxsw_sp_router_xm *router_xm = mlxsw_sp->router->xm;
+
+	return router_xm && router_xm->ipv4_supported;
+}