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Merge tag 'soundwire-5.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul...
[thirdparty/linux.git] / include / rdma / uverbs_ioctl.h
1 /*
2 * 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.
31 */
32
33 #ifndef _UVERBS_IOCTL_
34 #define _UVERBS_IOCTL_
35
36 #include <rdma/uverbs_types.h>
37 #include <linux/uaccess.h>
38 #include <rdma/rdma_user_ioctl.h>
39 #include <rdma/ib_user_ioctl_verbs.h>
40 #include <rdma/ib_user_ioctl_cmds.h>
41
42 /*
43 * =======================================
44 * Verbs action specifications
45 * =======================================
46 */
47
48 enum uverbs_attr_type {
49 UVERBS_ATTR_TYPE_NA,
50 UVERBS_ATTR_TYPE_PTR_IN,
51 UVERBS_ATTR_TYPE_PTR_OUT,
52 UVERBS_ATTR_TYPE_IDR,
53 UVERBS_ATTR_TYPE_FD,
54 UVERBS_ATTR_TYPE_ENUM_IN,
55 UVERBS_ATTR_TYPE_IDRS_ARRAY,
56 };
57
58 enum uverbs_obj_access {
59 UVERBS_ACCESS_READ,
60 UVERBS_ACCESS_WRITE,
61 UVERBS_ACCESS_NEW,
62 UVERBS_ACCESS_DESTROY
63 };
64
65 /* Specification of a single attribute inside the ioctl message */
66 /* good size 16 */
67 struct uverbs_attr_spec {
68 u8 type;
69
70 /*
71 * Support extending attributes by length. Allow the user to provide
72 * more bytes than ptr.len, but check that everything after is zero'd
73 * by the user.
74 */
75 u8 zero_trailing:1;
76 /*
77 * Valid only for PTR_IN. Allocate and copy the data inside
78 * the parser
79 */
80 u8 alloc_and_copy:1;
81 u8 mandatory:1;
82 /* True if this is from UVERBS_ATTR_UHW */
83 u8 is_udata:1;
84
85 union {
86 struct {
87 /* Current known size to kernel */
88 u16 len;
89 /* User isn't allowed to provide something < min_len */
90 u16 min_len;
91 } ptr;
92
93 struct {
94 /*
95 * higher bits mean the namespace and lower bits mean
96 * the type id within the namespace.
97 */
98 u16 obj_type;
99 u8 access;
100 } obj;
101
102 struct {
103 u8 num_elems;
104 } enum_def;
105 } u;
106
107 /* This weird split lets us remove some padding */
108 union {
109 struct {
110 /*
111 * The enum attribute can select one of the attributes
112 * contained in the ids array. Currently only PTR_IN
113 * attributes are supported in the ids array.
114 */
115 const struct uverbs_attr_spec *ids;
116 } enum_def;
117
118 struct {
119 /*
120 * higher bits mean the namespace and lower bits mean
121 * the type id within the namespace.
122 */
123 u16 obj_type;
124 u16 min_len;
125 u16 max_len;
126 u8 access;
127 } objs_arr;
128 } u2;
129 };
130
131 /*
132 * Information about the API is loaded into a radix tree. For IOCTL we start
133 * with a tuple of:
134 * object_id, attr_id, method_id
135 *
136 * Which is a 48 bit value, with most of the bits guaranteed to be zero. Based
137 * on the current kernel support this is compressed into 16 bit key for the
138 * radix tree. Since this compression is entirely internal to the kernel the
139 * below limits can be revised if the kernel gains additional data.
140 *
141 * With 64 leafs per node this is a 3 level radix tree.
142 *
143 * The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns
144 * the object slot, and OBJ_ID,METH_ID,0 and returns the method slot.
145 *
146 * This also encodes the tables for the write() and write() extended commands
147 * using the coding
148 * OBJ_ID,UVERBS_API_METHOD_IS_WRITE,command #
149 * OBJ_ID,UVERBS_API_METHOD_IS_WRITE_EX,command_ex #
150 * ie the WRITE path is treated as a special method type in the ioctl
151 * framework.
152 */
153 enum uapi_radix_data {
154 UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT,
155
156 UVERBS_API_ATTR_KEY_BITS = 6,
157 UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0),
158 UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1,
159 UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS,
160
161 UVERBS_API_METHOD_KEY_BITS = 5,
162 UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS,
163 UVERBS_API_METHOD_KEY_NUM_CORE = 22,
164 UVERBS_API_METHOD_IS_WRITE = 30 << UVERBS_API_METHOD_KEY_SHIFT,
165 UVERBS_API_METHOD_IS_WRITE_EX = 31 << UVERBS_API_METHOD_KEY_SHIFT,
166 UVERBS_API_METHOD_KEY_NUM_DRIVER =
167 (UVERBS_API_METHOD_IS_WRITE >> UVERBS_API_METHOD_KEY_SHIFT) -
168 UVERBS_API_METHOD_KEY_NUM_CORE,
169 UVERBS_API_METHOD_KEY_MASK = GENMASK(
170 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1,
171 UVERBS_API_METHOD_KEY_SHIFT),
172
173 UVERBS_API_OBJ_KEY_BITS = 5,
174 UVERBS_API_OBJ_KEY_SHIFT =
175 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT,
176 UVERBS_API_OBJ_KEY_NUM_CORE = 24,
177 UVERBS_API_OBJ_KEY_NUM_DRIVER =
178 (1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE,
179 UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT),
180
181 /* This id guaranteed to not exist in the radix tree */
182 UVERBS_API_KEY_ERR = 0xFFFFFFFF,
183 };
184
185 static inline __attribute_const__ u32 uapi_key_obj(u32 id)
186 {
187 if (id & UVERBS_API_NS_FLAG) {
188 id &= ~UVERBS_API_NS_FLAG;
189 if (id >= UVERBS_API_OBJ_KEY_NUM_DRIVER)
190 return UVERBS_API_KEY_ERR;
191 id = id + UVERBS_API_OBJ_KEY_NUM_CORE;
192 } else {
193 if (id >= UVERBS_API_OBJ_KEY_NUM_CORE)
194 return UVERBS_API_KEY_ERR;
195 }
196
197 return id << UVERBS_API_OBJ_KEY_SHIFT;
198 }
199
200 static inline __attribute_const__ bool uapi_key_is_object(u32 key)
201 {
202 return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0;
203 }
204
205 static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id)
206 {
207 if (id & UVERBS_API_NS_FLAG) {
208 id &= ~UVERBS_API_NS_FLAG;
209 if (id >= UVERBS_API_METHOD_KEY_NUM_DRIVER)
210 return UVERBS_API_KEY_ERR;
211 id = id + UVERBS_API_METHOD_KEY_NUM_CORE;
212 } else {
213 id++;
214 if (id >= UVERBS_API_METHOD_KEY_NUM_CORE)
215 return UVERBS_API_KEY_ERR;
216 }
217
218 return id << UVERBS_API_METHOD_KEY_SHIFT;
219 }
220
221 static inline __attribute_const__ u32 uapi_key_write_method(u32 id)
222 {
223 if (id >= UVERBS_API_WRITE_KEY_NUM)
224 return UVERBS_API_KEY_ERR;
225 return UVERBS_API_METHOD_IS_WRITE | id;
226 }
227
228 static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id)
229 {
230 if (id >= UVERBS_API_WRITE_KEY_NUM)
231 return UVERBS_API_KEY_ERR;
232 return UVERBS_API_METHOD_IS_WRITE_EX | id;
233 }
234
235 static inline __attribute_const__ u32
236 uapi_key_attr_to_ioctl_method(u32 attr_key)
237 {
238 return attr_key &
239 (UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK);
240 }
241
242 static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key)
243 {
244 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
245
246 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
247 (key & UVERBS_API_ATTR_KEY_MASK) == 0;
248 }
249
250 static inline __attribute_const__ bool uapi_key_is_write_method(u32 key)
251 {
252 return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE;
253 }
254
255 static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key)
256 {
257 return (key & UVERBS_API_METHOD_KEY_MASK) ==
258 UVERBS_API_METHOD_IS_WRITE_EX;
259 }
260
261 static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key)
262 {
263 /* 0 is the method slot itself */
264 return ioctl_method_key + 1;
265 }
266
267 static inline __attribute_const__ u32 uapi_key_attr(u32 id)
268 {
269 /*
270 * The attr is designed to fit in the typical single radix tree node
271 * of 64 entries. Since allmost all methods have driver attributes we
272 * organize things so that the driver and core attributes interleave to
273 * reduce the length of the attributes array in typical cases.
274 */
275 if (id & UVERBS_API_NS_FLAG) {
276 id &= ~UVERBS_API_NS_FLAG;
277 id++;
278 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
279 return UVERBS_API_KEY_ERR;
280 id = (id << 1) | 0;
281 } else {
282 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
283 return UVERBS_API_KEY_ERR;
284 id = (id << 1) | 1;
285 }
286
287 return id;
288 }
289
290 /* Only true for ioctl methods */
291 static inline __attribute_const__ bool uapi_key_is_attr(u32 key)
292 {
293 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
294
295 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
296 (key & UVERBS_API_ATTR_KEY_MASK) != 0;
297 }
298
299 /*
300 * This returns a value in the range [0 to UVERBS_API_ATTR_BKEY_LEN),
301 * basically it undoes the reservation of 0 in the ID numbering. attr_key
302 * must already be masked with UVERBS_API_ATTR_KEY_MASK, or be the output of
303 * uapi_key_attr().
304 */
305 static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
306 {
307 return attr_key - 1;
308 }
309
310 static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey)
311 {
312 return attr_bkey + 1;
313 }
314
315 /*
316 * =======================================
317 * Verbs definitions
318 * =======================================
319 */
320
321 struct uverbs_attr_def {
322 u16 id;
323 struct uverbs_attr_spec attr;
324 };
325
326 struct uverbs_method_def {
327 u16 id;
328 /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
329 u32 flags;
330 size_t num_attrs;
331 const struct uverbs_attr_def * const (*attrs)[];
332 int (*handler)(struct uverbs_attr_bundle *attrs);
333 };
334
335 struct uverbs_object_def {
336 u16 id;
337 const struct uverbs_obj_type *type_attrs;
338 size_t num_methods;
339 const struct uverbs_method_def * const (*methods)[];
340 };
341
342 enum uapi_definition_kind {
343 UAPI_DEF_END = 0,
344 UAPI_DEF_OBJECT_START,
345 UAPI_DEF_WRITE,
346 UAPI_DEF_CHAIN_OBJ_TREE,
347 UAPI_DEF_CHAIN,
348 UAPI_DEF_IS_SUPPORTED_FUNC,
349 UAPI_DEF_IS_SUPPORTED_DEV_FN,
350 };
351
352 enum uapi_definition_scope {
353 UAPI_SCOPE_OBJECT = 1,
354 UAPI_SCOPE_METHOD = 2,
355 };
356
357 struct uapi_definition {
358 u8 kind;
359 u8 scope;
360 union {
361 struct {
362 u16 object_id;
363 } object_start;
364 struct {
365 u16 command_num;
366 u8 is_ex:1;
367 u8 has_udata:1;
368 u8 has_resp:1;
369 u8 req_size;
370 u8 resp_size;
371 } write;
372 };
373
374 union {
375 bool (*func_is_supported)(struct ib_device *device);
376 int (*func_write)(struct uverbs_attr_bundle *attrs);
377 const struct uapi_definition *chain;
378 const struct uverbs_object_def *chain_obj_tree;
379 size_t needs_fn_offset;
380 };
381 };
382
383 /* Define things connected to object_id */
384 #define DECLARE_UVERBS_OBJECT(_object_id, ...) \
385 { \
386 .kind = UAPI_DEF_OBJECT_START, \
387 .object_start = { .object_id = _object_id }, \
388 }, \
389 ##__VA_ARGS__
390
391 /* Use in a var_args of DECLARE_UVERBS_OBJECT */
392 #define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \
393 { \
394 .kind = UAPI_DEF_WRITE, \
395 .scope = UAPI_SCOPE_OBJECT, \
396 .write = { .is_ex = 0, .command_num = _command_num }, \
397 .func_write = _func, \
398 _cmd_desc, \
399 }, \
400 ##__VA_ARGS__
401
402 /* Use in a var_args of DECLARE_UVERBS_OBJECT */
403 #define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \
404 { \
405 .kind = UAPI_DEF_WRITE, \
406 .scope = UAPI_SCOPE_OBJECT, \
407 .write = { .is_ex = 1, .command_num = _command_num }, \
408 .func_write = _func, \
409 _cmd_desc, \
410 }, \
411 ##__VA_ARGS__
412
413 /*
414 * Object is only supported if the function pointer named ibdev_fn in struct
415 * ib_device is not NULL.
416 */
417 #define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \
418 { \
419 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
420 .scope = UAPI_SCOPE_OBJECT, \
421 .needs_fn_offset = \
422 offsetof(struct ib_device_ops, ibdev_fn) + \
423 BUILD_BUG_ON_ZERO( \
424 sizeof(((struct ib_device_ops *)0)->ibdev_fn) != \
425 sizeof(void *)), \
426 }
427
428 /*
429 * Method is only supported if the function pointer named ibdev_fn in struct
430 * ib_device is not NULL.
431 */
432 #define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn) \
433 { \
434 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
435 .scope = UAPI_SCOPE_METHOD, \
436 .needs_fn_offset = \
437 offsetof(struct ib_device_ops, ibdev_fn) + \
438 BUILD_BUG_ON_ZERO( \
439 sizeof(((struct ib_device_ops *)0)->ibdev_fn) != \
440 sizeof(void *)), \
441 }
442
443 /* Call a function to determine if the entire object is supported or not */
444 #define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \
445 { \
446 .kind = UAPI_DEF_IS_SUPPORTED_FUNC, \
447 .scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \
448 }
449
450 /* Include another struct uapi_definition in this one */
451 #define UAPI_DEF_CHAIN(_def_var) \
452 { \
453 .kind = UAPI_DEF_CHAIN, .chain = _def_var, \
454 }
455
456 /* Temporary until the tree base description is replaced */
457 #define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...) \
458 { \
459 .kind = UAPI_DEF_CHAIN_OBJ_TREE, \
460 .object_start = { .object_id = _object_enum }, \
461 .chain_obj_tree = _object_ptr, \
462 }, \
463 ##__VA_ARGS__
464 #define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \
465 UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum), \
466 ##__VA_ARGS__)
467
468 /*
469 * =======================================
470 * Attribute Specifications
471 * =======================================
472 */
473
474 #define UVERBS_ATTR_SIZE(_min_len, _len) \
475 .u.ptr.min_len = _min_len, .u.ptr.len = _len
476
477 #define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0)
478
479 /*
480 * Specifies a uapi structure that cannot be extended. The user must always
481 * supply the whole structure and nothing more. The structure must be declared
482 * in a header under include/uapi/rdma.
483 */
484 #define UVERBS_ATTR_TYPE(_type) \
485 .u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type)
486 /*
487 * Specifies a uapi structure where the user must provide at least up to
488 * member 'last'. Anything after last and up until the end of the structure
489 * can be non-zero, anything longer than the end of the structure must be
490 * zero. The structure must be declared in a header under include/uapi/rdma.
491 */
492 #define UVERBS_ATTR_STRUCT(_type, _last) \
493 .zero_trailing = 1, \
494 UVERBS_ATTR_SIZE(((uintptr_t)(&((_type *)0)->_last + 1)), \
495 sizeof(_type))
496 /*
497 * Specifies at least min_len bytes must be passed in, but the amount can be
498 * larger, up to the protocol maximum size. No check for zeroing is done.
499 */
500 #define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX)
501
502 /* Must be used in the '...' of any UVERBS_ATTR */
503 #define UA_ALLOC_AND_COPY .alloc_and_copy = 1
504 #define UA_MANDATORY .mandatory = 1
505 #define UA_OPTIONAL .mandatory = 0
506
507 /*
508 * min_len must be bigger than 0 and _max_len must be smaller than 4095. Only
509 * READ\WRITE accesses are supported.
510 */
511 #define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \
512 ...) \
513 (&(const struct uverbs_attr_def){ \
514 .id = (_attr_id) + \
515 BUILD_BUG_ON_ZERO((_min_len) == 0 || \
516 (_max_len) > \
517 PAGE_SIZE / sizeof(void *) || \
518 (_min_len) > (_max_len) || \
519 (_access) == UVERBS_ACCESS_NEW || \
520 (_access) == UVERBS_ACCESS_DESTROY), \
521 .attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY, \
522 .u2.objs_arr.obj_type = _idr_type, \
523 .u2.objs_arr.access = _access, \
524 .u2.objs_arr.min_len = _min_len, \
525 .u2.objs_arr.max_len = _max_len, \
526 __VA_ARGS__ } })
527
528 /*
529 * Only for use with UVERBS_ATTR_IDR, allows any uobject type to be accepted,
530 * the user must validate the type of the uobject instead.
531 */
532 #define UVERBS_IDR_ANY_OBJECT 0xFFFF
533
534 #define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \
535 (&(const struct uverbs_attr_def){ \
536 .id = _attr_id, \
537 .attr = { .type = UVERBS_ATTR_TYPE_IDR, \
538 .u.obj.obj_type = _idr_type, \
539 .u.obj.access = _access, \
540 __VA_ARGS__ } })
541
542 #define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \
543 (&(const struct uverbs_attr_def){ \
544 .id = (_attr_id) + \
545 BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \
546 (_access) != UVERBS_ACCESS_READ), \
547 .attr = { .type = UVERBS_ATTR_TYPE_FD, \
548 .u.obj.obj_type = _fd_type, \
549 .u.obj.access = _access, \
550 __VA_ARGS__ } })
551
552 #define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \
553 (&(const struct uverbs_attr_def){ \
554 .id = _attr_id, \
555 .attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \
556 _type, \
557 __VA_ARGS__ } })
558
559 #define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \
560 (&(const struct uverbs_attr_def){ \
561 .id = _attr_id, \
562 .attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \
563 _type, \
564 __VA_ARGS__ } })
565
566 /* _enum_arry should be a 'static const union uverbs_attr_spec[]' */
567 #define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \
568 (&(const struct uverbs_attr_def){ \
569 .id = _attr_id, \
570 .attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \
571 .u2.enum_def.ids = _enum_arr, \
572 .u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \
573 __VA_ARGS__ }, \
574 })
575
576 /* An input value that is a member in the enum _enum_type. */
577 #define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...) \
578 UVERBS_ATTR_PTR_IN( \
579 _attr_id, \
580 UVERBS_ATTR_SIZE( \
581 sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \
582 sizeof(u64)), \
583 __VA_ARGS__)
584
585 /*
586 * An input value that is a bitwise combination of values of _enum_type.
587 * This permits the flag value to be passed as either a u32 or u64, it must
588 * be retrieved via uverbs_get_flag().
589 */
590 #define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \
591 UVERBS_ATTR_PTR_IN( \
592 _attr_id, \
593 UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \
594 !sizeof(_enum_type *)), \
595 sizeof(u64)), \
596 __VA_ARGS__)
597
598 /*
599 * This spec is used in order to pass information to the hardware driver in a
600 * legacy way. Every verb that could get driver specific data should get this
601 * spec.
602 */
603 #define UVERBS_ATTR_UHW() \
604 UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \
605 UVERBS_ATTR_MIN_SIZE(0), \
606 UA_OPTIONAL, \
607 .is_udata = 1), \
608 UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \
609 UVERBS_ATTR_MIN_SIZE(0), \
610 UA_OPTIONAL, \
611 .is_udata = 1)
612
613 /* =================================================
614 * Parsing infrastructure
615 * =================================================
616 */
617
618
619 struct uverbs_ptr_attr {
620 /*
621 * If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is
622 * used.
623 */
624 union {
625 void *ptr;
626 u64 data;
627 };
628 u16 len;
629 u16 uattr_idx;
630 u8 enum_id;
631 };
632
633 struct uverbs_obj_attr {
634 struct ib_uobject *uobject;
635 const struct uverbs_api_attr *attr_elm;
636 };
637
638 struct uverbs_objs_arr_attr {
639 struct ib_uobject **uobjects;
640 u16 len;
641 };
642
643 struct uverbs_attr {
644 union {
645 struct uverbs_ptr_attr ptr_attr;
646 struct uverbs_obj_attr obj_attr;
647 struct uverbs_objs_arr_attr objs_arr_attr;
648 };
649 };
650
651 struct uverbs_attr_bundle {
652 struct ib_udata driver_udata;
653 struct ib_udata ucore;
654 struct ib_uverbs_file *ufile;
655 struct ib_ucontext *context;
656 DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
657 struct uverbs_attr attrs[];
658 };
659
660 static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
661 unsigned int idx)
662 {
663 return test_bit(uapi_bkey_attr(uapi_key_attr(idx)),
664 attrs_bundle->attr_present);
665 }
666
667 /**
668 * rdma_udata_to_drv_context - Helper macro to get the driver's context out of
669 * ib_udata which is embedded in uverbs_attr_bundle.
670 *
671 * If udata is not NULL this cannot fail. Otherwise a NULL udata will result
672 * in a NULL ucontext pointer, as a safety precaution. Callers should be using
673 * 'udata' to determine if the driver call is in user or kernel mode, not
674 * 'ucontext'.
675 *
676 */
677 #define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
678 (udata ? container_of(container_of(udata, struct uverbs_attr_bundle, \
679 driver_udata) \
680 ->context, \
681 drv_dev_struct, member) : \
682 (drv_dev_struct *)NULL)
683
684 #define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
685
686 static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
687 u16 idx)
688 {
689 if (!uverbs_attr_is_valid(attrs_bundle, idx))
690 return ERR_PTR(-ENOENT);
691
692 return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))];
693 }
694
695 static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle,
696 u16 idx)
697 {
698 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
699
700 if (IS_ERR(attr))
701 return PTR_ERR(attr);
702
703 return attr->ptr_attr.enum_id;
704 }
705
706 static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle,
707 u16 idx)
708 {
709 const struct uverbs_attr *attr;
710
711 attr = uverbs_attr_get(attrs_bundle, idx);
712 if (IS_ERR(attr))
713 return ERR_CAST(attr);
714
715 return attr->obj_attr.uobject->object;
716 }
717
718 static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle,
719 u16 idx)
720 {
721 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
722
723 if (IS_ERR(attr))
724 return ERR_CAST(attr);
725
726 return attr->obj_attr.uobject;
727 }
728
729 static inline int
730 uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
731 {
732 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
733
734 if (IS_ERR(attr))
735 return PTR_ERR(attr);
736
737 return attr->ptr_attr.len;
738 }
739
740 /*
741 * uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr
742 * attribute.
743 * @attrs: The attribute bundle
744 * @idx: The ID of the attribute
745 * @elem_size: The size of the element in the array
746 */
747 static inline int
748 uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx,
749 size_t elem_size)
750 {
751 int size = uverbs_attr_get_len(attrs, idx);
752
753 if (size < 0)
754 return size;
755
756 if (size % elem_size)
757 return -EINVAL;
758
759 return size / elem_size;
760 }
761
762 /**
763 * uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for
764 * UVERBS_ATTR_TYPE_IDRS_ARRAY.
765 * @arr: Returned pointer to array of pointers for uobjects or NULL if
766 * the attribute isn't provided.
767 *
768 * Return: The array length or 0 if no attribute was provided.
769 */
770 static inline int uverbs_attr_get_uobjs_arr(
771 const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx,
772 struct ib_uobject ***arr)
773 {
774 const struct uverbs_attr *attr =
775 uverbs_attr_get(attrs_bundle, attr_idx);
776
777 if (IS_ERR(attr)) {
778 *arr = NULL;
779 return 0;
780 }
781
782 *arr = attr->objs_arr_attr.uobjects;
783
784 return attr->objs_arr_attr.len;
785 }
786
787 static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
788 {
789 return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
790 }
791
792 static inline void *uverbs_attr_get_alloced_ptr(
793 const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
794 {
795 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
796
797 if (IS_ERR(attr))
798 return (void *)attr;
799
800 return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data :
801 attr->ptr_attr.ptr;
802 }
803
804 static inline int _uverbs_copy_from(void *to,
805 const struct uverbs_attr_bundle *attrs_bundle,
806 size_t idx,
807 size_t size)
808 {
809 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
810
811 if (IS_ERR(attr))
812 return PTR_ERR(attr);
813
814 /*
815 * Validation ensures attr->ptr_attr.len >= size. If the caller is
816 * using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call
817 * uverbs_copy_from_or_zero.
818 */
819 if (unlikely(size < attr->ptr_attr.len))
820 return -EINVAL;
821
822 if (uverbs_attr_ptr_is_inline(attr))
823 memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len);
824 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data),
825 attr->ptr_attr.len))
826 return -EFAULT;
827
828 return 0;
829 }
830
831 static inline int _uverbs_copy_from_or_zero(void *to,
832 const struct uverbs_attr_bundle *attrs_bundle,
833 size_t idx,
834 size_t size)
835 {
836 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
837 size_t min_size;
838
839 if (IS_ERR(attr))
840 return PTR_ERR(attr);
841
842 min_size = min_t(size_t, size, attr->ptr_attr.len);
843
844 if (uverbs_attr_ptr_is_inline(attr))
845 memcpy(to, &attr->ptr_attr.data, min_size);
846 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data),
847 min_size))
848 return -EFAULT;
849
850 if (size > min_size)
851 memset(to + min_size, 0, size - min_size);
852
853 return 0;
854 }
855
856 #define uverbs_copy_from(to, attrs_bundle, idx) \
857 _uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to))
858
859 #define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \
860 _uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to))
861
862 static inline struct ib_ucontext *
863 ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs)
864 {
865 return ib_uverbs_get_ucontext_file(attrs->ufile);
866 }
867
868 #if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
869 int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
870 size_t idx, u64 allowed_bits);
871 int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
872 size_t idx, u64 allowed_bits);
873 int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx,
874 const void *from, size_t size);
875 __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size,
876 gfp_t flags);
877
878 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
879 size_t size)
880 {
881 return _uverbs_alloc(bundle, size, GFP_KERNEL);
882 }
883
884 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
885 size_t size)
886 {
887 return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO);
888 }
889 int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
890 size_t idx, s64 lower_bound, u64 upper_bound,
891 s64 *def_val);
892 int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
893 size_t idx, const void *from, size_t size);
894 #else
895 static inline int
896 uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
897 size_t idx, u64 allowed_bits)
898 {
899 return -EINVAL;
900 }
901 static inline int
902 uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
903 size_t idx, u64 allowed_bits)
904 {
905 return -EINVAL;
906 }
907 static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
908 size_t idx, const void *from, size_t size)
909 {
910 return -EINVAL;
911 }
912 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
913 size_t size)
914 {
915 return ERR_PTR(-EINVAL);
916 }
917 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
918 size_t size)
919 {
920 return ERR_PTR(-EINVAL);
921 }
922 static inline int
923 _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
924 size_t idx, s64 lower_bound, u64 upper_bound,
925 s64 *def_val)
926 {
927 return -EINVAL;
928 }
929 static inline int
930 uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
931 size_t idx, const void *from, size_t size)
932 {
933 return -EINVAL;
934 }
935 #endif
936
937 #define uverbs_get_const(_to, _attrs_bundle, _idx) \
938 ({ \
939 s64 _val; \
940 int _ret = _uverbs_get_const(&_val, _attrs_bundle, _idx, \
941 type_min(typeof(*_to)), \
942 type_max(typeof(*_to)), NULL); \
943 (*_to) = _val; \
944 _ret; \
945 })
946
947 #define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \
948 ({ \
949 s64 _val; \
950 s64 _def_val = _default; \
951 int _ret = \
952 _uverbs_get_const(&_val, _attrs_bundle, _idx, \
953 type_min(typeof(*_to)), \
954 type_max(typeof(*_to)), &_def_val); \
955 (*_to) = _val; \
956 _ret; \
957 })
958 #endif
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