RDMA/uverbs: Simplify UVERBS_OBJECT and _TREE family of macros

Instead of the large set of indirecting macros, define the few needed
macros to directly instantiate the struct uverbs_oject_tree_def and
associated objects list.

This is small amount of code duplication but the readability is far
better.
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>

drivers/infiniband/core/uverbs.h

@@ -238,8 +238,6 @@ void ib_uverbs_detach_umcast(struct ib_qp *qp,
 			     struct ib_uqp_object *uobj);
 
 void create_udata(struct uverbs_attr_bundle *ctx, struct ib_udata *udata);
-extern const struct uverbs_attr_def uverbs_uhw_compat_in;
-extern const struct uverbs_attr_def uverbs_uhw_compat_out;
 long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 int uverbs_destroy_def_handler(struct ib_device *ib_dev,
 			       struct ib_uverbs_file *file,

drivers/infiniband/core/uverbs_std_types.c

@@ -216,18 +216,6 @@ int uverbs_destroy_def_handler(struct ib_device *ib_dev,
 	return 0;
 }
 
-/*
- * This spec is used in order to pass information to the hardware driver in a
- * legacy way. Every verb that could get driver specific data should get this
- * spec.
- */
-const struct uverbs_attr_def uverbs_uhw_compat_in =
-	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, UVERBS_ATTR_MIN_SIZE(0),
-			   UA_FLAGS(UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO));
-const struct uverbs_attr_def uverbs_uhw_compat_out =
-	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, UVERBS_ATTR_MIN_SIZE(0),
-			    UA_FLAGS(UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO));
-
 void create_udata(struct uverbs_attr_bundle *ctx, struct ib_udata *udata)
 {
 	/*
@@ -300,7 +288,7 @@ DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_PD,
 
 DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_DEVICE, NULL);
 
-static DECLARE_UVERBS_OBJECT_TREE(uverbs_default_objects,
+DECLARE_UVERBS_OBJECT_TREE(uverbs_default_objects,
 			   &UVERBS_OBJECT(UVERBS_OBJECT_DEVICE),
 			   &UVERBS_OBJECT(UVERBS_OBJECT_PD),
 			   &UVERBS_OBJECT(UVERBS_OBJECT_MR),

drivers/infiniband/core/uverbs_std_types_cq.c

@@ -165,7 +165,7 @@ DECLARE_UVERBS_NAMED_METHOD(UVERBS_METHOD_CQ_CREATE,
 	&UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_FLAGS, UVERBS_ATTR_TYPE(u32)),
 	&UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_CREATE_CQ_RESP_CQE, UVERBS_ATTR_TYPE(u32),
 			     UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
-	&uverbs_uhw_compat_in, &uverbs_uhw_compat_out);
+	UVERBS_ATTR_UHW());
 
 static int UVERBS_HANDLER(UVERBS_METHOD_CQ_DESTROY)(struct ib_device *ib_dev,
 						    struct ib_uverbs_file *file,

drivers/infiniband/hw/mlx5/devx.c

@@ -1079,24 +1079,24 @@ DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_OBJ_QUERY,
 			     UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY |
 				      UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO)));
 
-static DECLARE_UVERBS_GLOBAL_METHODS(MLX5_IB_OBJECT_DEVX,
+DECLARE_UVERBS_GLOBAL_METHODS(MLX5_IB_OBJECT_DEVX,
 	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OTHER),
 	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_QUERY_UAR),
 	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_QUERY_EQN));
 
-static DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ,
+DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ,
 	&UVERBS_TYPE_ALLOC_IDR(devx_obj_cleanup),
 		&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_CREATE),
 		&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_DESTROY),
 		&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_MODIFY),
 		&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_QUERY));
 
-static DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_UMEM,
+DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_UMEM,
 	&UVERBS_TYPE_ALLOC_IDR(devx_umem_cleanup),
 	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_UMEM_REG),
 	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_UMEM_DEREG));
 
-static DECLARE_UVERBS_OBJECT_TREE(devx_objects,
+DECLARE_UVERBS_OBJECT_TREE(devx_objects,
 	&UVERBS_OBJECT(MLX5_IB_OBJECT_DEVX),
 	&UVERBS_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ),
 	&UVERBS_OBJECT(MLX5_IB_OBJECT_DEVX_UMEM));

include/rdma/uverbs_ioctl.h

@@ -253,33 +253,33 @@ struct uverbs_object_tree_def {
 			  __VA_ARGS__ },                                       \
 	})
 
+/*
+ * This spec is used in order to pass information to the hardware driver in a
+ * legacy way. Every verb that could get driver specific data should get this
+ * spec.
+ */
+#define UVERBS_ATTR_UHW()                                                      \
+	&UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN,                                \
+			    UVERBS_ATTR_SIZE(0, USHRT_MAX),		       \
+			    UA_FLAGS(UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO)),      \
+	&UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT,                              \
+			     UVERBS_ATTR_SIZE(0, USHRT_MAX),		       \
+			     UA_FLAGS(UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO))
+
 /*
  * =======================================
  *	Declaration helpers
  * =======================================
  */
-#define _UVERBS_OBJECT_METHODS_SZ(...)					\
-	(sizeof((const struct uverbs_method_def * const []){__VA_ARGS__}) / \
-	 sizeof(const struct uverbs_method_def *))
-#define _UVERBS_OBJECT(_id, _type_attrs, ...)				\
-	((const struct uverbs_object_def) {				\
-	 .id = _id,							\
-	 .type_attrs = _type_attrs,					\
-	 .num_methods = _UVERBS_OBJECT_METHODS_SZ(__VA_ARGS__),		\
-	 .methods = &(const struct uverbs_method_def * const []){__VA_ARGS__} })
-#define DECLARE_UVERBS_OBJECT(_name, _id, _type_attrs, ...)		\
-	const struct uverbs_object_def _name =				\
-		_UVERBS_OBJECT(_id, _type_attrs, ##__VA_ARGS__)
-#define _UVERBS_TREE_OBJECTS_SZ(...)					\
-	(sizeof((const struct uverbs_object_def * const []){__VA_ARGS__}) / \
-	 sizeof(const struct uverbs_object_def *))
-#define _UVERBS_OBJECT_TREE(...)					\
-	((const struct uverbs_object_tree_def) {			\
-	 .num_objects = _UVERBS_TREE_OBJECTS_SZ(__VA_ARGS__),		\
-	 .objects = &(const struct uverbs_object_def * const []){__VA_ARGS__} })
+
 #define DECLARE_UVERBS_OBJECT_TREE(_name, ...)                                 \
-	const struct uverbs_object_tree_def _name =			\
-		_UVERBS_OBJECT_TREE(__VA_ARGS__)
+	static const struct uverbs_object_def *const _name##_ptr[] = {         \
+		__VA_ARGS__,                                                   \
+	};                                                                     \
+	static const struct uverbs_object_tree_def _name = {                   \
+		.num_objects = ARRAY_SIZE(_name##_ptr),                        \
+		.objects = &_name##_ptr,                                       \
+	}
 
 /* =================================================
  *              Parsing infrastructure

include/rdma/uverbs_named_ioctl.h

@@ -45,8 +45,9 @@
 #define UVERBS_HANDLER(id)	_UVERBS_NAME(UVERBS_MODULE_NAME, _handler_##id)
 #define UVERBS_OBJECT(id)	_UVERBS_NAME(UVERBS_MOUDLE_NAME, _object_##id)
 
-#define UVERBS_METHOD_ATTRS(id)                                                \
-	_UVERBS_NAME(UVERBS_MODULE_NAME, _method_attrs_##id)
+/* These are static so they do not need to be qualified */
+#define UVERBS_METHOD_ATTRS(method_id) _method_attrs_##method_id
+#define UVERBS_OBJECT_METHODS(object_id) _object_methods_##object_id
 
 #define DECLARE_UVERBS_NAMED_METHOD(_method_id, ...)                           \
 	static const struct uverbs_attr_def *const UVERBS_METHOD_ATTRS(        \
@@ -72,14 +73,19 @@
 		.attrs = &UVERBS_METHOD_ATTRS(_method_id),                     \
 	}
 
-#define DECLARE_UVERBS_NAMED_OBJECT(id, ...)	\
-	DECLARE_UVERBS_OBJECT(UVERBS_OBJECT(id), id, ##__VA_ARGS__)
+#define DECLARE_UVERBS_NAMED_OBJECT(_object_id, _type_attrs, ...)              \
+	static const struct uverbs_method_def *const UVERBS_OBJECT_METHODS(    \
+		_object_id)[] = { __VA_ARGS__ };                               \
+	const struct uverbs_object_def UVERBS_OBJECT(_object_id) = {           \
+		.id = _object_id,                                              \
+		.type_attrs = _type_attrs,                                     \
+		.num_methods = ARRAY_SIZE(UVERBS_OBJECT_METHODS(_object_id)),  \
+		.methods = &UVERBS_OBJECT_METHODS(_object_id)                  \
+	}
 
 #define DECLARE_UVERBS_GLOBAL_METHODS(_name, ...)	\
 	DECLARE_UVERBS_NAMED_OBJECT(_name, NULL, ##__VA_ARGS__)
 
-#define _UVERBS_COMP_NAME(x, y, z) _UVERBS_NAME(_UVERBS_NAME(x, y), z)
-
 /* Used by drivers to declare a complete parsing tree for a single method that
  * differs only in having additional driver specific attributes.
  */
@@ -91,11 +97,19 @@
 		.num_attrs = ARRAY_SIZE(UVERBS_METHOD_ATTRS(_method_id)),      \
 		.attrs = &UVERBS_METHOD_ATTRS(_method_id),                     \
 	};                                                                     \
-	static DECLARE_UVERBS_OBJECT(                                          \
-		_UVERBS_COMP_NAME(UVERBS_MODULE_NAME, _object_id, _name),      \
-		_object_id, NULL, &UVERBS_METHOD(_method_id));                 \
-	static DECLARE_UVERBS_OBJECT_TREE(                                     \
-		_name,                                                         \
-		&_UVERBS_COMP_NAME(UVERBS_MODULE_NAME, _object_id, _name))
+	static const struct uverbs_method_def *const UVERBS_OBJECT_METHODS(    \
+		_object_id)[] = { &UVERBS_METHOD(_method_id) };                \
+	static const struct uverbs_object_def _name##_struct = {               \
+		.id = _object_id,                                              \
+		.num_methods = 1,                                              \
+		.methods = &UVERBS_OBJECT_METHODS(_object_id)                  \
+	};                                                                     \
+	static const struct uverbs_object_def *const _name##_ptrs[] = {        \
+		&_name##_struct,                                               \
+	};                                                                     \
+	static const struct uverbs_object_tree_def _name = {                   \
+		.num_objects = 1,                                              \
+		.objects = &_name##_ptrs,                                      \
+	}
 
 #endif