RDMA/mlx5: Fail early if user tries to create flows on IB representors

IB representors don't support creation of RAW ethernet QP flows.  Disable
them by reusing existing RDMA/core support macros.  We do it for both
creation and matcher because latter is not usable if no flow creation is
available.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/flow.c

@@ -134,8 +134,6 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_CREATE_FLOW)(
 			return -EINVAL;
 		flow_act.action |= MLX5_FLOW_CONTEXT_ACTION_COUNT;
 	}
-	if (dev->rep)
-		return -ENOTSUPP;
 
 	if (dest_type == MLX5_FLOW_DESTINATION_TYPE_TIR &&
 	    fs_matcher->ns_type == MLX5_FLOW_NAMESPACE_EGRESS)
@@ -623,9 +621,19 @@ DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_FLOW_MATCHER,
 			    &UVERBS_METHOD(MLX5_IB_METHOD_FLOW_MATCHER_CREATE),
 			    &UVERBS_METHOD(MLX5_IB_METHOD_FLOW_MATCHER_DESTROY));
 
+static bool flow_is_supported(struct ib_device *device)
+{
+	return !to_mdev(device)->rep;
+}
+
 const struct uapi_definition mlx5_ib_flow_defs[] = {
-	UAPI_DEF_CHAIN_OBJ_TREE_NAMED(MLX5_IB_OBJECT_FLOW_MATCHER),
-	UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_FLOW, &mlx5_ib_fs),
+	UAPI_DEF_CHAIN_OBJ_TREE_NAMED(
+		MLX5_IB_OBJECT_FLOW_MATCHER,
+		UAPI_DEF_IS_OBJ_SUPPORTED(flow_is_supported)),
+	UAPI_DEF_CHAIN_OBJ_TREE(
+		UVERBS_OBJECT_FLOW,
+		&mlx5_ib_fs,
+		UAPI_DEF_IS_OBJ_SUPPORTED(flow_is_supported)),
 	UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_FLOW_ACTION,
 				&mlx5_ib_flow_actions),
 	{},

include/rdma/uverbs_ioctl.h

@@ -454,15 +454,16 @@ struct uapi_definition {
 	}
 
 /* Temporary until the tree base description is replaced */
-#define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr)                     \
+#define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...)                \
 	{                                                                      \
 		.kind = UAPI_DEF_CHAIN_OBJ_TREE,                               \
 		.object_start = { .object_id = _object_enum },                 \
 		.chain_obj_tree = _object_ptr,                                 \
-	}
-#define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...)                       \
-	UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum)),   \
+	},								       \
 		##__VA_ARGS__
+#define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...)                       \
+	UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum),    \
+				##__VA_ARGS__)
 
 /*
  * =======================================