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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/include/rdma/uverbs_ioctl.h
....@@ -1,33 +1,6 @@
1
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
12 /*
23  * Copyright (c) 2017, Mellanox Technologies inc.  All rights reserved.
3
- *
4
- * This software is available to you under a choice of one of two
5
- * licenses.  You may choose to be licensed under the terms of the GNU
6
- * General Public License (GPL) Version 2, available from the file
7
- * COPYING in the main directory of this source tree, or the
8
- * OpenIB.org BSD license below:
9
- *
10
- *     Redistribution and use in source and binary forms, with or
11
- *     without modification, are permitted provided that the following
12
- *     conditions are met:
13
- *
14
- *      - Redistributions of source code must retain the above
15
- *        copyright notice, this list of conditions and the following
16
- *        disclaimer.
17
- *
18
- *      - Redistributions in binary form must reproduce the above
19
- *        copyright notice, this list of conditions and the following
20
- *        disclaimer in the documentation and/or other materials
21
- *        provided with the distribution.
22
- *
23
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30
- * SOFTWARE.
314  */
325 
336 #ifndef _UVERBS_IOCTL_
....@@ -52,6 +25,7 @@
5225 	UVERBS_ATTR_TYPE_IDR,
5326 	UVERBS_ATTR_TYPE_FD,
5427 	UVERBS_ATTR_TYPE_ENUM_IN,
28
+	UVERBS_ATTR_TYPE_IDRS_ARRAY,
5529 };
5630 
5731 enum uverbs_obj_access {
....@@ -78,6 +52,8 @@
7852 	 */
7953 	u8 alloc_and_copy:1;
8054 	u8 mandatory:1;
55
+	/* True if this is from UVERBS_ATTR_UHW */
56
+	u8 is_udata:1;
8157 
8258 	union {
8359 		struct {
....@@ -101,7 +77,7 @@
10177 		} enum_def;
10278 	} u;
10379 
104
-	/* This weird split of the enum lets us remove some padding */
80
+	/* This weird split lets us remove some padding */
10581 	union {
10682 		struct {
10783 			/*
....@@ -111,6 +87,17 @@
11187 			 */
11288 			const struct uverbs_attr_spec *ids;
11389 		} enum_def;
90
+
91
+		struct {
92
+			/*
93
+			 * higher bits mean the namespace and lower bits mean
94
+			 * the type id within the namespace.
95
+			 */
96
+			u16				obj_type;
97
+			u16				min_len;
98
+			u16				max_len;
99
+			u8				access;
100
+		} objs_arr;
114101 	} u2;
115102 };
116103 
....@@ -128,6 +115,13 @@
128115  *
129116  * The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns
130117  * the object slot, and OBJ_ID,METH_ID,0 and returns the method slot.
118
+ *
119
+ * This also encodes the tables for the write() and write() extended commands
120
+ * using the coding
121
+ *   OBJ_ID,UVERBS_API_METHOD_IS_WRITE,command #
122
+ *   OBJ_ID,UVERBS_API_METHOD_IS_WRITE_EX,command_ex #
123
+ * ie the WRITE path is treated as a special method type in the ioctl
124
+ * framework.
131125  */
132126 enum uapi_radix_data {
133127 	UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT,
....@@ -135,12 +129,16 @@
135129 	UVERBS_API_ATTR_KEY_BITS = 6,
136130 	UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0),
137131 	UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1,
132
+	UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS,
138133 
139134 	UVERBS_API_METHOD_KEY_BITS = 5,
140135 	UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS,
141
-	UVERBS_API_METHOD_KEY_NUM_CORE = 24,
142
-	UVERBS_API_METHOD_KEY_NUM_DRIVER = (1 << UVERBS_API_METHOD_KEY_BITS) -
143
-					   UVERBS_API_METHOD_KEY_NUM_CORE,
136
+	UVERBS_API_METHOD_KEY_NUM_CORE = 22,
137
+	UVERBS_API_METHOD_IS_WRITE = 30 << UVERBS_API_METHOD_KEY_SHIFT,
138
+	UVERBS_API_METHOD_IS_WRITE_EX = 31 << UVERBS_API_METHOD_KEY_SHIFT,
139
+	UVERBS_API_METHOD_KEY_NUM_DRIVER =
140
+		(UVERBS_API_METHOD_IS_WRITE >> UVERBS_API_METHOD_KEY_SHIFT) -
141
+		UVERBS_API_METHOD_KEY_NUM_CORE,
144142 	UVERBS_API_METHOD_KEY_MASK = GENMASK(
145143 		UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1,
146144 		UVERBS_API_METHOD_KEY_SHIFT),
....@@ -148,7 +146,7 @@
148146 	UVERBS_API_OBJ_KEY_BITS = 5,
149147 	UVERBS_API_OBJ_KEY_SHIFT =
150148 		UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT,
151
-	UVERBS_API_OBJ_KEY_NUM_CORE = 24,
149
+	UVERBS_API_OBJ_KEY_NUM_CORE = 20,
152150 	UVERBS_API_OBJ_KEY_NUM_DRIVER =
153151 		(1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE,
154152 	UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT),
....@@ -193,7 +191,22 @@
193191 	return id << UVERBS_API_METHOD_KEY_SHIFT;
194192 }
195193 
196
-static inline __attribute_const__ u32 uapi_key_attr_to_method(u32 attr_key)
194
+static inline __attribute_const__ u32 uapi_key_write_method(u32 id)
195
+{
196
+	if (id >= UVERBS_API_WRITE_KEY_NUM)
197
+		return UVERBS_API_KEY_ERR;
198
+	return UVERBS_API_METHOD_IS_WRITE | id;
199
+}
200
+
201
+static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id)
202
+{
203
+	if (id >= UVERBS_API_WRITE_KEY_NUM)
204
+		return UVERBS_API_KEY_ERR;
205
+	return UVERBS_API_METHOD_IS_WRITE_EX | id;
206
+}
207
+
208
+static inline __attribute_const__ u32
209
+uapi_key_attr_to_ioctl_method(u32 attr_key)
197210 {
198211 	return attr_key &
199212 	       (UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK);
....@@ -201,8 +214,21 @@
201214 
202215 static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key)
203216 {
204
-	return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
217
+	unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
218
+
219
+	return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
205220 	       (key & UVERBS_API_ATTR_KEY_MASK) == 0;
221
+}
222
+
223
+static inline __attribute_const__ bool uapi_key_is_write_method(u32 key)
224
+{
225
+	return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE;
226
+}
227
+
228
+static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key)
229
+{
230
+	return (key & UVERBS_API_METHOD_KEY_MASK) ==
231
+	       UVERBS_API_METHOD_IS_WRITE_EX;
206232 }
207233 
208234 static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key)
....@@ -234,9 +260,12 @@
234260 	return id;
235261 }
236262 
263
+/* Only true for ioctl methods */
237264 static inline __attribute_const__ bool uapi_key_is_attr(u32 key)
238265 {
239
-	return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
266
+	unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
267
+
268
+	return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
240269 	       (key & UVERBS_API_ATTR_KEY_MASK) != 0;
241270 }
242271 
....@@ -249,6 +278,11 @@
249278 static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
250279 {
251280 	return attr_key - 1;
281
+}
282
+
283
+static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey)
284
+{
285
+	return attr_bkey + 1;
252286 }
253287 
254288 /*
....@@ -268,8 +302,7 @@
268302 	u32				     flags;
269303 	size_t				     num_attrs;
270304 	const struct uverbs_attr_def * const (*attrs)[];
271
-	int (*handler)(struct ib_uverbs_file *ufile,
272
-		       struct uverbs_attr_bundle *ctx);
305
+	int (*handler)(struct uverbs_attr_bundle *attrs);
273306 };
274307 
275308 struct uverbs_object_def {
....@@ -279,10 +312,131 @@
279312 	const struct uverbs_method_def * const (*methods)[];
280313 };
281314 
282
-struct uverbs_object_tree_def {
283
-	size_t					 num_objects;
284
-	const struct uverbs_object_def * const (*objects)[];
315
+enum uapi_definition_kind {
316
+	UAPI_DEF_END = 0,
317
+	UAPI_DEF_OBJECT_START,
318
+	UAPI_DEF_WRITE,
319
+	UAPI_DEF_CHAIN_OBJ_TREE,
320
+	UAPI_DEF_CHAIN,
321
+	UAPI_DEF_IS_SUPPORTED_FUNC,
322
+	UAPI_DEF_IS_SUPPORTED_DEV_FN,
285323 };
324
+
325
+enum uapi_definition_scope {
326
+	UAPI_SCOPE_OBJECT = 1,
327
+	UAPI_SCOPE_METHOD = 2,
328
+};
329
+
330
+struct uapi_definition {
331
+	u8 kind;
332
+	u8 scope;
333
+	union {
334
+		struct {
335
+			u16 object_id;
336
+		} object_start;
337
+		struct {
338
+			u16 command_num;
339
+			u8 is_ex:1;
340
+			u8 has_udata:1;
341
+			u8 has_resp:1;
342
+			u8 req_size;
343
+			u8 resp_size;
344
+		} write;
345
+	};
346
+
347
+	union {
348
+		bool (*func_is_supported)(struct ib_device *device);
349
+		int (*func_write)(struct uverbs_attr_bundle *attrs);
350
+		const struct uapi_definition *chain;
351
+		const struct uverbs_object_def *chain_obj_tree;
352
+		size_t needs_fn_offset;
353
+	};
354
+};
355
+
356
+/* Define things connected to object_id */
357
+#define DECLARE_UVERBS_OBJECT(_object_id, ...)                                 \
358
+	{                                                                      \
359
+		.kind = UAPI_DEF_OBJECT_START,                                 \
360
+		.object_start = { .object_id = _object_id },                   \
361
+	},                                                                     \
362
+		##__VA_ARGS__
363
+
364
+/* Use in a var_args of DECLARE_UVERBS_OBJECT */
365
+#define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...)              \
366
+	{                                                                      \
367
+		.kind = UAPI_DEF_WRITE,                                        \
368
+		.scope = UAPI_SCOPE_OBJECT,                                    \
369
+		.write = { .is_ex = 0, .command_num = _command_num },          \
370
+		.func_write = _func,                                           \
371
+		_cmd_desc,                                                     \
372
+	},                                                                     \
373
+		##__VA_ARGS__
374
+
375
+/* Use in a var_args of DECLARE_UVERBS_OBJECT */
376
+#define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...)           \
377
+	{                                                                      \
378
+		.kind = UAPI_DEF_WRITE,                                        \
379
+		.scope = UAPI_SCOPE_OBJECT,                                    \
380
+		.write = { .is_ex = 1, .command_num = _command_num },          \
381
+		.func_write = _func,                                           \
382
+		_cmd_desc,                                                     \
383
+	},                                                                     \
384
+		##__VA_ARGS__
385
+
386
+/*
387
+ * Object is only supported if the function pointer named ibdev_fn in struct
388
+ * ib_device is not NULL.
389
+ */
390
+#define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn)                                        \
391
+	{                                                                      \
392
+		.kind = UAPI_DEF_IS_SUPPORTED_DEV_FN,                          \
393
+		.scope = UAPI_SCOPE_OBJECT,                                    \
394
+		.needs_fn_offset =                                             \
395
+			offsetof(struct ib_device_ops, ibdev_fn) +             \
396
+			BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops,   \
397
+						       ibdev_fn) !=            \
398
+					  sizeof(void *)),                     \
399
+	}
400
+
401
+/*
402
+ * Method is only supported if the function pointer named ibdev_fn in struct
403
+ * ib_device is not NULL.
404
+ */
405
+#define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn)                                     \
406
+	{                                                                      \
407
+		.kind = UAPI_DEF_IS_SUPPORTED_DEV_FN,                          \
408
+		.scope = UAPI_SCOPE_METHOD,                                    \
409
+		.needs_fn_offset =                                             \
410
+			offsetof(struct ib_device_ops, ibdev_fn) +             \
411
+			BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops,   \
412
+						       ibdev_fn) !=            \
413
+					  sizeof(void *)),                     \
414
+	}
415
+
416
+/* Call a function to determine if the entire object is supported or not */
417
+#define UAPI_DEF_IS_OBJ_SUPPORTED(_func)                                       \
418
+	{                                                                      \
419
+		.kind = UAPI_DEF_IS_SUPPORTED_FUNC,                            \
420
+		.scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func,        \
421
+	}
422
+
423
+/* Include another struct uapi_definition in this one */
424
+#define UAPI_DEF_CHAIN(_def_var)                                               \
425
+	{                                                                      \
426
+		.kind = UAPI_DEF_CHAIN, .chain = _def_var,                     \
427
+	}
428
+
429
+/* Temporary until the tree base description is replaced */
430
+#define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...)                \
431
+	{                                                                      \
432
+		.kind = UAPI_DEF_CHAIN_OBJ_TREE,                               \
433
+		.object_start = { .object_id = _object_enum },                 \
434
+		.chain_obj_tree = _object_ptr,                                 \
435
+	},								       \
436
+		##__VA_ARGS__
437
+#define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...)                       \
438
+	UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum),    \
439
+				##__VA_ARGS__)
286440 
287441 /*
288442  * =======================================
....@@ -310,8 +464,7 @@
310464  */
311465 #define UVERBS_ATTR_STRUCT(_type, _last)                                       \
312466 	.zero_trailing = 1,                                                    \
313
-	UVERBS_ATTR_SIZE(((uintptr_t)(&((_type *)0)->_last + 1)),              \
314
-			 sizeof(_type))
467
+	UVERBS_ATTR_SIZE(offsetofend(_type, _last), sizeof(_type))
315468 /*
316469  * Specifies at least min_len bytes must be passed in, but the amount can be
317470  * larger, up to the protocol maximum size. No check for zeroing is done.
....@@ -322,6 +475,33 @@
322475 #define UA_ALLOC_AND_COPY .alloc_and_copy = 1
323476 #define UA_MANDATORY .mandatory = 1
324477 #define UA_OPTIONAL .mandatory = 0
478
+
479
+/*
480
+ * min_len must be bigger than 0 and _max_len must be smaller than 4095.  Only
481
+ * READ\WRITE accesses are supported.
482
+ */
483
+#define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \
484
+			     ...)                                              \
485
+	(&(const struct uverbs_attr_def){                                      \
486
+		.id = (_attr_id) +                                             \
487
+		      BUILD_BUG_ON_ZERO((_min_len) == 0 ||                     \
488
+					(_max_len) >                           \
489
+						PAGE_SIZE / sizeof(void *) ||  \
490
+					(_min_len) > (_max_len) ||             \
491
+					(_access) == UVERBS_ACCESS_NEW ||      \
492
+					(_access) == UVERBS_ACCESS_DESTROY),   \
493
+		.attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY,                 \
494
+			  .u2.objs_arr.obj_type = _idr_type,                   \
495
+			  .u2.objs_arr.access = _access,                       \
496
+			  .u2.objs_arr.min_len = _min_len,                     \
497
+			  .u2.objs_arr.max_len = _max_len,                     \
498
+			  __VA_ARGS__ } })
499
+
500
+/*
501
+ * Only for use with UVERBS_ATTR_IDR, allows any uobject type to be accepted,
502
+ * the user must validate the type of the uobject instead.
503
+ */
504
+#define UVERBS_IDR_ANY_OBJECT 0xFFFF
325505 
326506 #define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...)                     \
327507 	(&(const struct uverbs_attr_def){                                      \
....@@ -365,6 +545,15 @@
365545 			  __VA_ARGS__ },                                       \
366546 	})
367547 
548
+/* An input value that is a member in the enum _enum_type. */
549
+#define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...)                        \
550
+	UVERBS_ATTR_PTR_IN(                                                    \
551
+		_attr_id,                                                      \
552
+		UVERBS_ATTR_SIZE(                                              \
553
+			sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)),  \
554
+			sizeof(u64)),                                          \
555
+		__VA_ARGS__)
556
+
368557 /*
369558  * An input value that is a bitwise combination of values of _enum_type.
370559  * This permits the flag value to be passed as either a u32 or u64, it must
....@@ -386,25 +575,12 @@
386575 #define UVERBS_ATTR_UHW()                                                      \
387576 	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN,                                 \
388577 			   UVERBS_ATTR_MIN_SIZE(0),			       \
389
-			   UA_OPTIONAL),				       \
578
+			   UA_OPTIONAL,                                        \
579
+			   .is_udata = 1),				       \
390580 	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT,                               \
391581 			    UVERBS_ATTR_MIN_SIZE(0),			       \
392
-			    UA_OPTIONAL)
393
-
394
-/*
395
- * =======================================
396
- *	Declaration helpers
397
- * =======================================
398
- */
399
-
400
-#define DECLARE_UVERBS_OBJECT_TREE(_name, ...)                                 \
401
-	static const struct uverbs_object_def *const _name##_ptr[] = {         \
402
-		__VA_ARGS__,                                                   \
403
-	};                                                                     \
404
-	static const struct uverbs_object_tree_def _name = {                   \
405
-		.num_objects = ARRAY_SIZE(_name##_ptr),                        \
406
-		.objects = &_name##_ptr,                                       \
407
-	}
582
+			    UA_OPTIONAL,                                       \
583
+			    .is_udata = 1)
408584 
409585 /* =================================================
410586  *              Parsing infrastructure
....@@ -431,15 +607,25 @@
431607 	const struct uverbs_api_attr	*attr_elm;
432608 };
433609 
610
+struct uverbs_objs_arr_attr {
611
+	struct ib_uobject **uobjects;
612
+	u16 len;
613
+};
614
+
434615 struct uverbs_attr {
435616 	union {
436617 		struct uverbs_ptr_attr	ptr_attr;
437618 		struct uverbs_obj_attr	obj_attr;
619
+		struct uverbs_objs_arr_attr objs_arr_attr;
438620 	};
439621 };
440622 
441623 struct uverbs_attr_bundle {
624
+	struct ib_udata driver_udata;
625
+	struct ib_udata ucore;
442626 	struct ib_uverbs_file *ufile;
627
+	struct ib_ucontext *context;
628
+	struct ib_uobject *uobject;
443629 	DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
444630 	struct uverbs_attr attrs[];
445631 };
....@@ -450,6 +636,23 @@
450636 	return test_bit(uapi_bkey_attr(uapi_key_attr(idx)),
451637 			attrs_bundle->attr_present);
452638 }
639
+
640
+/**
641
+ * rdma_udata_to_drv_context - Helper macro to get the driver's context out of
642
+ *                             ib_udata which is embedded in uverbs_attr_bundle.
643
+ *
644
+ * If udata is not NULL this cannot fail. Otherwise a NULL udata will result
645
+ * in a NULL ucontext pointer, as a safety precaution. Callers should be using
646
+ * 'udata' to determine if the driver call is in user or kernel mode, not
647
+ * 'ucontext'.
648
+ *
649
+ */
650
+#define rdma_udata_to_drv_context(udata, drv_dev_struct, member)               \
651
+	(udata ? container_of(container_of(udata, struct uverbs_attr_bundle,   \
652
+					   driver_udata)                       \
653
+				      ->context,                               \
654
+			      drv_dev_struct, member) :                        \
655
+		 (drv_dev_struct *)NULL)
453656 
454657 #define IS_UVERBS_COPY_ERR(_ret)		((_ret) && (_ret) != -ENOENT)
455658 
....@@ -505,6 +708,56 @@
505708 		return PTR_ERR(attr);
506709 
507710 	return attr->ptr_attr.len;
711
+}
712
+
713
+void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *attrs_bundle,
714
+				 u16 idx);
715
+
716
+/*
717
+ * uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr
718
+ * attribute.
719
+ * @attrs: The attribute bundle
720
+ * @idx: The ID of the attribute
721
+ * @elem_size: The size of the element in the array
722
+ */
723
+static inline int
724
+uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx,
725
+			       size_t elem_size)
726
+{
727
+	int size = uverbs_attr_get_len(attrs, idx);
728
+
729
+	if (size < 0)
730
+		return size;
731
+
732
+	if (size % elem_size)
733
+		return -EINVAL;
734
+
735
+	return size / elem_size;
736
+}
737
+
738
+/**
739
+ * uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for
740
+ * UVERBS_ATTR_TYPE_IDRS_ARRAY.
741
+ * @arr: Returned pointer to array of pointers for uobjects or NULL if
742
+ *       the attribute isn't provided.
743
+ *
744
+ * Return: The array length or 0 if no attribute was provided.
745
+ */
746
+static inline int uverbs_attr_get_uobjs_arr(
747
+	const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx,
748
+	struct ib_uobject ***arr)
749
+{
750
+	const struct uverbs_attr *attr =
751
+			uverbs_attr_get(attrs_bundle, attr_idx);
752
+
753
+	if (IS_ERR(attr)) {
754
+		*arr = NULL;
755
+		return 0;
756
+	}
757
+
758
+	*arr = attr->objs_arr_attr.uobjects;
759
+
760
+	return attr->objs_arr_attr.len;
508761 }
509762 
510763 static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
....@@ -582,6 +835,12 @@
582835 #define uverbs_copy_from_or_zero(to, attrs_bundle, idx)			      \
583836 	_uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to))
584837 
838
+static inline struct ib_ucontext *
839
+ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs)
840
+{
841
+	return ib_uverbs_get_ucontext_file(attrs->ufile);
842
+}
843
+
585844 #if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
586845 int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
587846 		       size_t idx, u64 allowed_bits);
....@@ -603,6 +862,21 @@
603862 {
604863 	return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO);
605864 }
865
+
866
+static inline __malloc void *uverbs_kcalloc(struct uverbs_attr_bundle *bundle,
867
+					    size_t n, size_t size)
868
+{
869
+	size_t bytes;
870
+
871
+	if (unlikely(check_mul_overflow(n, size, &bytes)))
872
+		return ERR_PTR(-EOVERFLOW);
873
+	return uverbs_zalloc(bundle, bytes);
874
+}
875
+int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
876
+		      size_t idx, s64 lower_bound, u64 upper_bound,
877
+		      s64 *def_val);
878
+int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
879
+				  size_t idx, const void *from, size_t size);
606880 #else
607881 static inline int
608882 uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
....@@ -631,6 +905,40 @@
631905 {
632906 	return ERR_PTR(-EINVAL);
633907 }
908
+static inline int
909
+_uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
910
+		  size_t idx, s64 lower_bound, u64 upper_bound,
911
+		  s64 *def_val)
912
+{
913
+	return -EINVAL;
914
+}
915
+static inline int
916
+uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
917
+			      size_t idx, const void *from, size_t size)
918
+{
919
+	return -EINVAL;
920
+}
634921 #endif
635922 
923
+#define uverbs_get_const(_to, _attrs_bundle, _idx)                             \
924
+	({                                                                     \
925
+		s64 _val;                                                      \
926
+		int _ret = _uverbs_get_const(&_val, _attrs_bundle, _idx,       \
927
+					     type_min(typeof(*_to)),           \
928
+					     type_max(typeof(*_to)), NULL);    \
929
+		(*_to) = _val;                                                 \
930
+		_ret;                                                          \
931
+	})
932
+
933
+#define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default)           \
934
+	({                                                                     \
935
+		s64 _val;                                                      \
936
+		s64 _def_val = _default;                                       \
937
+		int _ret =                                                     \
938
+			_uverbs_get_const(&_val, _attrs_bundle, _idx,          \
939
+					  type_min(typeof(*_to)),              \
940
+					  type_max(typeof(*_to)), &_def_val);  \
941
+		(*_to) = _val;                                                 \
942
+		_ret;                                                          \
943
+	})
636944 #endif