From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/include/rdma/uverbs_ioctl.h | 428 ++++++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 368 insertions(+), 60 deletions(-)
diff --git a/kernel/include/rdma/uverbs_ioctl.h b/kernel/include/rdma/uverbs_ioctl.h
index 9e997c3..94fac55 100644
--- a/kernel/include/rdma/uverbs_ioctl.h
+++ b/kernel/include/rdma/uverbs_ioctl.h
@@ -1,33 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses. You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials
- * provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
*/
#ifndef _UVERBS_IOCTL_
@@ -52,6 +25,7 @@
UVERBS_ATTR_TYPE_IDR,
UVERBS_ATTR_TYPE_FD,
UVERBS_ATTR_TYPE_ENUM_IN,
+ UVERBS_ATTR_TYPE_IDRS_ARRAY,
};
enum uverbs_obj_access {
@@ -78,6 +52,8 @@
*/
u8 alloc_and_copy:1;
u8 mandatory:1;
+ /* True if this is from UVERBS_ATTR_UHW */
+ u8 is_udata:1;
union {
struct {
@@ -101,7 +77,7 @@
} enum_def;
} u;
- /* This weird split of the enum lets us remove some padding */
+ /* This weird split lets us remove some padding */
union {
struct {
/*
@@ -111,6 +87,17 @@
*/
const struct uverbs_attr_spec *ids;
} enum_def;
+
+ struct {
+ /*
+ * higher bits mean the namespace and lower bits mean
+ * the type id within the namespace.
+ */
+ u16 obj_type;
+ u16 min_len;
+ u16 max_len;
+ u8 access;
+ } objs_arr;
} u2;
};
@@ -128,6 +115,13 @@
*
* The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns
* the object slot, and OBJ_ID,METH_ID,0 and returns the method slot.
+ *
+ * This also encodes the tables for the write() and write() extended commands
+ * using the coding
+ * OBJ_ID,UVERBS_API_METHOD_IS_WRITE,command #
+ * OBJ_ID,UVERBS_API_METHOD_IS_WRITE_EX,command_ex #
+ * ie the WRITE path is treated as a special method type in the ioctl
+ * framework.
*/
enum uapi_radix_data {
UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT,
@@ -135,12 +129,16 @@
UVERBS_API_ATTR_KEY_BITS = 6,
UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0),
UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1,
+ UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS,
UVERBS_API_METHOD_KEY_BITS = 5,
UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS,
- UVERBS_API_METHOD_KEY_NUM_CORE = 24,
- UVERBS_API_METHOD_KEY_NUM_DRIVER = (1 << UVERBS_API_METHOD_KEY_BITS) -
- UVERBS_API_METHOD_KEY_NUM_CORE,
+ UVERBS_API_METHOD_KEY_NUM_CORE = 22,
+ UVERBS_API_METHOD_IS_WRITE = 30 << UVERBS_API_METHOD_KEY_SHIFT,
+ UVERBS_API_METHOD_IS_WRITE_EX = 31 << UVERBS_API_METHOD_KEY_SHIFT,
+ UVERBS_API_METHOD_KEY_NUM_DRIVER =
+ (UVERBS_API_METHOD_IS_WRITE >> UVERBS_API_METHOD_KEY_SHIFT) -
+ UVERBS_API_METHOD_KEY_NUM_CORE,
UVERBS_API_METHOD_KEY_MASK = GENMASK(
UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1,
UVERBS_API_METHOD_KEY_SHIFT),
@@ -148,7 +146,7 @@
UVERBS_API_OBJ_KEY_BITS = 5,
UVERBS_API_OBJ_KEY_SHIFT =
UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT,
- UVERBS_API_OBJ_KEY_NUM_CORE = 24,
+ UVERBS_API_OBJ_KEY_NUM_CORE = 20,
UVERBS_API_OBJ_KEY_NUM_DRIVER =
(1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE,
UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT),
@@ -193,7 +191,22 @@
return id << UVERBS_API_METHOD_KEY_SHIFT;
}
-static inline __attribute_const__ u32 uapi_key_attr_to_method(u32 attr_key)
+static inline __attribute_const__ u32 uapi_key_write_method(u32 id)
+{
+ if (id >= UVERBS_API_WRITE_KEY_NUM)
+ return UVERBS_API_KEY_ERR;
+ return UVERBS_API_METHOD_IS_WRITE | id;
+}
+
+static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id)
+{
+ if (id >= UVERBS_API_WRITE_KEY_NUM)
+ return UVERBS_API_KEY_ERR;
+ return UVERBS_API_METHOD_IS_WRITE_EX | id;
+}
+
+static inline __attribute_const__ u32
+uapi_key_attr_to_ioctl_method(u32 attr_key)
{
return attr_key &
(UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK);
@@ -201,8 +214,21 @@
static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key)
{
- return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
+ unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
+
+ return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
(key & UVERBS_API_ATTR_KEY_MASK) == 0;
+}
+
+static inline __attribute_const__ bool uapi_key_is_write_method(u32 key)
+{
+ return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE;
+}
+
+static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key)
+{
+ return (key & UVERBS_API_METHOD_KEY_MASK) ==
+ UVERBS_API_METHOD_IS_WRITE_EX;
}
static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key)
@@ -234,9 +260,12 @@
return id;
}
+/* Only true for ioctl methods */
static inline __attribute_const__ bool uapi_key_is_attr(u32 key)
{
- return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
+ unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
+
+ return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
(key & UVERBS_API_ATTR_KEY_MASK) != 0;
}
@@ -249,6 +278,11 @@
static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
{
return attr_key - 1;
+}
+
+static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey)
+{
+ return attr_bkey + 1;
}
/*
@@ -268,8 +302,7 @@
u32 flags;
size_t num_attrs;
const struct uverbs_attr_def * const (*attrs)[];
- int (*handler)(struct ib_uverbs_file *ufile,
- struct uverbs_attr_bundle *ctx);
+ int (*handler)(struct uverbs_attr_bundle *attrs);
};
struct uverbs_object_def {
@@ -279,10 +312,131 @@
const struct uverbs_method_def * const (*methods)[];
};
-struct uverbs_object_tree_def {
- size_t num_objects;
- const struct uverbs_object_def * const (*objects)[];
+enum uapi_definition_kind {
+ UAPI_DEF_END = 0,
+ UAPI_DEF_OBJECT_START,
+ UAPI_DEF_WRITE,
+ UAPI_DEF_CHAIN_OBJ_TREE,
+ UAPI_DEF_CHAIN,
+ UAPI_DEF_IS_SUPPORTED_FUNC,
+ UAPI_DEF_IS_SUPPORTED_DEV_FN,
};
+
+enum uapi_definition_scope {
+ UAPI_SCOPE_OBJECT = 1,
+ UAPI_SCOPE_METHOD = 2,
+};
+
+struct uapi_definition {
+ u8 kind;
+ u8 scope;
+ union {
+ struct {
+ u16 object_id;
+ } object_start;
+ struct {
+ u16 command_num;
+ u8 is_ex:1;
+ u8 has_udata:1;
+ u8 has_resp:1;
+ u8 req_size;
+ u8 resp_size;
+ } write;
+ };
+
+ union {
+ bool (*func_is_supported)(struct ib_device *device);
+ int (*func_write)(struct uverbs_attr_bundle *attrs);
+ const struct uapi_definition *chain;
+ const struct uverbs_object_def *chain_obj_tree;
+ size_t needs_fn_offset;
+ };
+};
+
+/* Define things connected to object_id */
+#define DECLARE_UVERBS_OBJECT(_object_id, ...) \
+ { \
+ .kind = UAPI_DEF_OBJECT_START, \
+ .object_start = { .object_id = _object_id }, \
+ }, \
+ ##__VA_ARGS__
+
+/* Use in a var_args of DECLARE_UVERBS_OBJECT */
+#define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \
+ { \
+ .kind = UAPI_DEF_WRITE, \
+ .scope = UAPI_SCOPE_OBJECT, \
+ .write = { .is_ex = 0, .command_num = _command_num }, \
+ .func_write = _func, \
+ _cmd_desc, \
+ }, \
+ ##__VA_ARGS__
+
+/* Use in a var_args of DECLARE_UVERBS_OBJECT */
+#define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \
+ { \
+ .kind = UAPI_DEF_WRITE, \
+ .scope = UAPI_SCOPE_OBJECT, \
+ .write = { .is_ex = 1, .command_num = _command_num }, \
+ .func_write = _func, \
+ _cmd_desc, \
+ }, \
+ ##__VA_ARGS__
+
+/*
+ * Object is only supported if the function pointer named ibdev_fn in struct
+ * ib_device is not NULL.
+ */
+#define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \
+ { \
+ .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
+ .scope = UAPI_SCOPE_OBJECT, \
+ .needs_fn_offset = \
+ offsetof(struct ib_device_ops, ibdev_fn) + \
+ BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \
+ ibdev_fn) != \
+ sizeof(void *)), \
+ }
+
+/*
+ * Method is only supported if the function pointer named ibdev_fn in struct
+ * ib_device is not NULL.
+ */
+#define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn) \
+ { \
+ .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
+ .scope = UAPI_SCOPE_METHOD, \
+ .needs_fn_offset = \
+ offsetof(struct ib_device_ops, ibdev_fn) + \
+ BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \
+ ibdev_fn) != \
+ sizeof(void *)), \
+ }
+
+/* Call a function to determine if the entire object is supported or not */
+#define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \
+ { \
+ .kind = UAPI_DEF_IS_SUPPORTED_FUNC, \
+ .scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \
+ }
+
+/* Include another struct uapi_definition in this one */
+#define UAPI_DEF_CHAIN(_def_var) \
+ { \
+ .kind = UAPI_DEF_CHAIN, .chain = _def_var, \
+ }
+
+/* Temporary until the tree base description is replaced */
+#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, \
+ }, \
+ ##__VA_ARGS__
+#define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \
+ UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum), \
+ ##__VA_ARGS__)
/*
* =======================================
@@ -310,8 +464,7 @@
*/
#define UVERBS_ATTR_STRUCT(_type, _last) \
.zero_trailing = 1, \
- UVERBS_ATTR_SIZE(((uintptr_t)(&((_type *)0)->_last + 1)), \
- sizeof(_type))
+ UVERBS_ATTR_SIZE(offsetofend(_type, _last), sizeof(_type))
/*
* Specifies at least min_len bytes must be passed in, but the amount can be
* larger, up to the protocol maximum size. No check for zeroing is done.
@@ -322,6 +475,33 @@
#define UA_ALLOC_AND_COPY .alloc_and_copy = 1
#define UA_MANDATORY .mandatory = 1
#define UA_OPTIONAL .mandatory = 0
+
+/*
+ * min_len must be bigger than 0 and _max_len must be smaller than 4095. Only
+ * READ\WRITE accesses are supported.
+ */
+#define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \
+ ...) \
+ (&(const struct uverbs_attr_def){ \
+ .id = (_attr_id) + \
+ BUILD_BUG_ON_ZERO((_min_len) == 0 || \
+ (_max_len) > \
+ PAGE_SIZE / sizeof(void *) || \
+ (_min_len) > (_max_len) || \
+ (_access) == UVERBS_ACCESS_NEW || \
+ (_access) == UVERBS_ACCESS_DESTROY), \
+ .attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY, \
+ .u2.objs_arr.obj_type = _idr_type, \
+ .u2.objs_arr.access = _access, \
+ .u2.objs_arr.min_len = _min_len, \
+ .u2.objs_arr.max_len = _max_len, \
+ __VA_ARGS__ } })
+
+/*
+ * Only for use with UVERBS_ATTR_IDR, allows any uobject type to be accepted,
+ * the user must validate the type of the uobject instead.
+ */
+#define UVERBS_IDR_ANY_OBJECT 0xFFFF
#define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \
(&(const struct uverbs_attr_def){ \
@@ -365,6 +545,15 @@
__VA_ARGS__ }, \
})
+/* An input value that is a member in the enum _enum_type. */
+#define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...) \
+ UVERBS_ATTR_PTR_IN( \
+ _attr_id, \
+ UVERBS_ATTR_SIZE( \
+ sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \
+ sizeof(u64)), \
+ __VA_ARGS__)
+
/*
* An input value that is a bitwise combination of values of _enum_type.
* This permits the flag value to be passed as either a u32 or u64, it must
@@ -386,25 +575,12 @@
#define UVERBS_ATTR_UHW() \
UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \
UVERBS_ATTR_MIN_SIZE(0), \
- UA_OPTIONAL), \
+ UA_OPTIONAL, \
+ .is_udata = 1), \
UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \
UVERBS_ATTR_MIN_SIZE(0), \
- UA_OPTIONAL)
-
-/*
- * =======================================
- * Declaration helpers
- * =======================================
- */
-
-#define DECLARE_UVERBS_OBJECT_TREE(_name, ...) \
- 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, \
- }
+ UA_OPTIONAL, \
+ .is_udata = 1)
/* =================================================
* Parsing infrastructure
@@ -431,15 +607,25 @@
const struct uverbs_api_attr *attr_elm;
};
+struct uverbs_objs_arr_attr {
+ struct ib_uobject **uobjects;
+ u16 len;
+};
+
struct uverbs_attr {
union {
struct uverbs_ptr_attr ptr_attr;
struct uverbs_obj_attr obj_attr;
+ struct uverbs_objs_arr_attr objs_arr_attr;
};
};
struct uverbs_attr_bundle {
+ struct ib_udata driver_udata;
+ struct ib_udata ucore;
struct ib_uverbs_file *ufile;
+ struct ib_ucontext *context;
+ struct ib_uobject *uobject;
DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
struct uverbs_attr attrs[];
};
@@ -450,6 +636,23 @@
return test_bit(uapi_bkey_attr(uapi_key_attr(idx)),
attrs_bundle->attr_present);
}
+
+/**
+ * rdma_udata_to_drv_context - Helper macro to get the driver's context out of
+ * ib_udata which is embedded in uverbs_attr_bundle.
+ *
+ * If udata is not NULL this cannot fail. Otherwise a NULL udata will result
+ * in a NULL ucontext pointer, as a safety precaution. Callers should be using
+ * 'udata' to determine if the driver call is in user or kernel mode, not
+ * 'ucontext'.
+ *
+ */
+#define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
+ (udata ? container_of(container_of(udata, struct uverbs_attr_bundle, \
+ driver_udata) \
+ ->context, \
+ drv_dev_struct, member) : \
+ (drv_dev_struct *)NULL)
#define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
@@ -505,6 +708,56 @@
return PTR_ERR(attr);
return attr->ptr_attr.len;
+}
+
+void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *attrs_bundle,
+ u16 idx);
+
+/*
+ * uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr
+ * attribute.
+ * @attrs: The attribute bundle
+ * @idx: The ID of the attribute
+ * @elem_size: The size of the element in the array
+ */
+static inline int
+uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx,
+ size_t elem_size)
+{
+ int size = uverbs_attr_get_len(attrs, idx);
+
+ if (size < 0)
+ return size;
+
+ if (size % elem_size)
+ return -EINVAL;
+
+ return size / elem_size;
+}
+
+/**
+ * uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for
+ * UVERBS_ATTR_TYPE_IDRS_ARRAY.
+ * @arr: Returned pointer to array of pointers for uobjects or NULL if
+ * the attribute isn't provided.
+ *
+ * Return: The array length or 0 if no attribute was provided.
+ */
+static inline int uverbs_attr_get_uobjs_arr(
+ const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx,
+ struct ib_uobject ***arr)
+{
+ const struct uverbs_attr *attr =
+ uverbs_attr_get(attrs_bundle, attr_idx);
+
+ if (IS_ERR(attr)) {
+ *arr = NULL;
+ return 0;
+ }
+
+ *arr = attr->objs_arr_attr.uobjects;
+
+ return attr->objs_arr_attr.len;
}
static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
@@ -582,6 +835,12 @@
#define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \
_uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to))
+static inline struct ib_ucontext *
+ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs)
+{
+ return ib_uverbs_get_ucontext_file(attrs->ufile);
+}
+
#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits);
@@ -603,6 +862,21 @@
{
return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO);
}
+
+static inline __malloc void *uverbs_kcalloc(struct uverbs_attr_bundle *bundle,
+ size_t n, size_t size)
+{
+ size_t bytes;
+
+ if (unlikely(check_mul_overflow(n, size, &bytes)))
+ return ERR_PTR(-EOVERFLOW);
+ return uverbs_zalloc(bundle, bytes);
+}
+int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
+ size_t idx, s64 lower_bound, u64 upper_bound,
+ s64 *def_val);
+int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
+ size_t idx, const void *from, size_t size);
#else
static inline int
uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
@@ -631,6 +905,40 @@
{
return ERR_PTR(-EINVAL);
}
+static inline int
+_uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
+ size_t idx, s64 lower_bound, u64 upper_bound,
+ s64 *def_val)
+{
+ return -EINVAL;
+}
+static inline int
+uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
+ size_t idx, const void *from, size_t size)
+{
+ return -EINVAL;
+}
#endif
+#define uverbs_get_const(_to, _attrs_bundle, _idx) \
+ ({ \
+ s64 _val; \
+ int _ret = _uverbs_get_const(&_val, _attrs_bundle, _idx, \
+ type_min(typeof(*_to)), \
+ type_max(typeof(*_to)), NULL); \
+ (*_to) = _val; \
+ _ret; \
+ })
+
+#define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \
+ ({ \
+ s64 _val; \
+ s64 _def_val = _default; \
+ int _ret = \
+ _uverbs_get_const(&_val, _attrs_bundle, _idx, \
+ type_min(typeof(*_to)), \
+ type_max(typeof(*_to)), &_def_val); \
+ (*_to) = _val; \
+ _ret; \
+ })
#endif
--
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