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a0aa309c MB |
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> | |
35410306 MB |
37 | #include <linux/uaccess.h> |
38 | #include <rdma/rdma_user_ioctl.h> | |
d70724f1 | 39 | #include <rdma/ib_user_ioctl_verbs.h> |
1f7ff9d5 | 40 | #include <rdma/ib_user_ioctl_cmds.h> |
a0aa309c MB |
41 | |
42 | /* | |
43 | * ======================================= | |
44 | * Verbs action specifications | |
45 | * ======================================= | |
46 | */ | |
47 | ||
f43dbebf MB |
48 | enum uverbs_attr_type { |
49 | UVERBS_ATTR_TYPE_NA, | |
fac9658c MB |
50 | UVERBS_ATTR_TYPE_PTR_IN, |
51 | UVERBS_ATTR_TYPE_PTR_OUT, | |
f43dbebf MB |
52 | UVERBS_ATTR_TYPE_IDR, |
53 | UVERBS_ATTR_TYPE_FD, | |
494c5580 | 54 | UVERBS_ATTR_TYPE_ENUM_IN, |
70cd20ae | 55 | UVERBS_ATTR_TYPE_IDRS_ARRAY, |
f43dbebf MB |
56 | }; |
57 | ||
a0aa309c MB |
58 | enum uverbs_obj_access { |
59 | UVERBS_ACCESS_READ, | |
60 | UVERBS_ACCESS_WRITE, | |
61 | UVERBS_ACCESS_NEW, | |
62 | UVERBS_ACCESS_DESTROY | |
63 | }; | |
64 | ||
1f07e08f | 65 | /* Specification of a single attribute inside the ioctl message */ |
83bb4442 | 66 | /* good size 16 */ |
f43dbebf | 67 | struct uverbs_attr_spec { |
d108dac0 | 68 | u8 type; |
83bb4442 JG |
69 | |
70 | /* | |
422e3d37 JG |
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. | |
83bb4442 | 74 | */ |
422e3d37 | 75 | u8 zero_trailing:1; |
83bb4442 JG |
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; | |
07f05f40 JG |
82 | /* True if this is from UVERBS_ATTR_UHW */ |
83 | u8 is_udata:1; | |
d108dac0 | 84 | |
fac9658c | 85 | union { |
1f07e08f | 86 | struct { |
c66db311 | 87 | /* Current known size to kernel */ |
d108dac0 | 88 | u16 len; |
c66db311 | 89 | /* User isn't allowed to provide something < min_len */ |
d108dac0 | 90 | u16 min_len; |
1f07e08f | 91 | } ptr; |
d108dac0 | 92 | |
1f07e08f | 93 | struct { |
fac9658c MB |
94 | /* |
95 | * higher bits mean the namespace and lower bits mean | |
96 | * the type id within the namespace. | |
97 | */ | |
d108dac0 JG |
98 | u16 obj_type; |
99 | u8 access; | |
fac9658c | 100 | } obj; |
d108dac0 JG |
101 | |
102 | struct { | |
103 | u8 num_elems; | |
104 | } enum_def; | |
105 | } u; | |
106 | ||
70cd20ae | 107 | /* This weird split lets us remove some padding */ |
d108dac0 | 108 | union { |
494c5580 | 109 | struct { |
494c5580 MB |
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 | */ | |
d108dac0 | 115 | const struct uverbs_attr_spec *ids; |
494c5580 | 116 | } enum_def; |
70cd20ae GL |
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; | |
d108dac0 | 128 | } u2; |
f43dbebf MB |
129 | }; |
130 | ||
9ed3e5f4 JG |
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. | |
6884c6c4 JG |
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. | |
9ed3e5f4 JG |
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, | |
6884c6c4 | 159 | UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS, |
9ed3e5f4 JG |
160 | |
161 | UVERBS_API_METHOD_KEY_BITS = 5, | |
162 | UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS, | |
6884c6c4 JG |
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, | |
9ed3e5f4 JG |
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 | ||
6884c6c4 JG |
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) | |
9ed3e5f4 JG |
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 | { | |
6884c6c4 JG |
244 | unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; |
245 | ||
246 | return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && | |
9ed3e5f4 JG |
247 | (key & UVERBS_API_ATTR_KEY_MASK) == 0; |
248 | } | |
249 | ||
6884c6c4 JG |
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 | ||
9ed3e5f4 JG |
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 | ||
6884c6c4 | 290 | /* Only true for ioctl methods */ |
9ed3e5f4 JG |
291 | static inline __attribute_const__ bool uapi_key_is_attr(u32 key) |
292 | { | |
6884c6c4 JG |
293 | unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; |
294 | ||
295 | return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && | |
9ed3e5f4 JG |
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 | ||
70cd20ae GL |
310 | static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey) |
311 | { | |
312 | return attr_bkey + 1; | |
313 | } | |
314 | ||
5009010f MB |
315 | /* |
316 | * ======================================= | |
317 | * Verbs definitions | |
318 | * ======================================= | |
319 | */ | |
320 | ||
09e3ebf8 MB |
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)[]; | |
15a1b4be | 332 | int (*handler)(struct uverbs_attr_bundle *attrs); |
09e3ebf8 MB |
333 | }; |
334 | ||
5009010f | 335 | struct uverbs_object_def { |
09e3ebf8 | 336 | u16 id; |
5009010f | 337 | const struct uverbs_obj_type *type_attrs; |
09e3ebf8 MB |
338 | size_t num_methods; |
339 | const struct uverbs_method_def * const (*methods)[]; | |
340 | }; | |
341 | ||
0cbf432d JG |
342 | enum uapi_definition_kind { |
343 | UAPI_DEF_END = 0, | |
6884c6c4 JG |
344 | UAPI_DEF_OBJECT_START, |
345 | UAPI_DEF_WRITE, | |
0cbf432d JG |
346 | UAPI_DEF_CHAIN_OBJ_TREE, |
347 | UAPI_DEF_CHAIN, | |
6829c1c2 JG |
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, | |
a140692a | 354 | UAPI_SCOPE_METHOD = 2, |
5009010f MB |
355 | }; |
356 | ||
0cbf432d JG |
357 | struct uapi_definition { |
358 | u8 kind; | |
6829c1c2 | 359 | u8 scope; |
0cbf432d JG |
360 | union { |
361 | struct { | |
362 | u16 object_id; | |
363 | } object_start; | |
6884c6c4 | 364 | struct { |
6884c6c4 | 365 | u16 command_num; |
669dac1e JG |
366 | u8 is_ex:1; |
367 | u8 has_udata:1; | |
368 | u8 has_resp:1; | |
369 | u8 req_size; | |
370 | u8 resp_size; | |
6884c6c4 | 371 | } write; |
0cbf432d JG |
372 | }; |
373 | ||
374 | union { | |
6829c1c2 | 375 | bool (*func_is_supported)(struct ib_device *device); |
974d6b4b | 376 | int (*func_write)(struct uverbs_attr_bundle *attrs); |
0cbf432d JG |
377 | const struct uapi_definition *chain; |
378 | const struct uverbs_object_def *chain_obj_tree; | |
6829c1c2 | 379 | size_t needs_fn_offset; |
0cbf432d JG |
380 | }; |
381 | }; | |
382 | ||
6884c6c4 JG |
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 */ | |
669dac1e | 392 | #define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \ |
6884c6c4 JG |
393 | { \ |
394 | .kind = UAPI_DEF_WRITE, \ | |
395 | .scope = UAPI_SCOPE_OBJECT, \ | |
396 | .write = { .is_ex = 0, .command_num = _command_num }, \ | |
397 | .func_write = _func, \ | |
669dac1e | 398 | _cmd_desc, \ |
6884c6c4 JG |
399 | }, \ |
400 | ##__VA_ARGS__ | |
401 | ||
402 | /* Use in a var_args of DECLARE_UVERBS_OBJECT */ | |
669dac1e | 403 | #define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \ |
6884c6c4 JG |
404 | { \ |
405 | .kind = UAPI_DEF_WRITE, \ | |
406 | .scope = UAPI_SCOPE_OBJECT, \ | |
407 | .write = { .is_ex = 1, .command_num = _command_num }, \ | |
974d6b4b | 408 | .func_write = _func, \ |
669dac1e | 409 | _cmd_desc, \ |
6884c6c4 JG |
410 | }, \ |
411 | ##__VA_ARGS__ | |
412 | ||
6829c1c2 JG |
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 = \ | |
3023a1e9 | 422 | offsetof(struct ib_device_ops, ibdev_fn) + \ |
6829c1c2 | 423 | BUILD_BUG_ON_ZERO( \ |
3023a1e9 KH |
424 | sizeof(((struct ib_device_ops *)0)->ibdev_fn) != \ |
425 | sizeof(void *)), \ | |
6829c1c2 JG |
426 | } |
427 | ||
a140692a JG |
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 = \ | |
3023a1e9 | 437 | offsetof(struct ib_device_ops, ibdev_fn) + \ |
a140692a | 438 | BUILD_BUG_ON_ZERO( \ |
3023a1e9 KH |
439 | sizeof(((struct ib_device_ops *)0)->ibdev_fn) != \ |
440 | sizeof(void *)), \ | |
a140692a JG |
441 | } |
442 | ||
6829c1c2 JG |
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 | ||
0cbf432d JG |
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 */ | |
a1462351 | 457 | #define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...) \ |
0cbf432d JG |
458 | { \ |
459 | .kind = UAPI_DEF_CHAIN_OBJ_TREE, \ | |
460 | .object_start = { .object_id = _object_enum }, \ | |
461 | .chain_obj_tree = _object_ptr, \ | |
a1462351 | 462 | }, \ |
0cbf432d | 463 | ##__VA_ARGS__ |
a1462351 LR |
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__) | |
0cbf432d | 467 | |
d108dac0 JG |
468 | /* |
469 | * ======================================= | |
470 | * Attribute Specifications | |
471 | * ======================================= | |
472 | */ | |
c66db311 | 473 | |
c66db311 | 474 | #define UVERBS_ATTR_SIZE(_min_len, _len) \ |
d108dac0 | 475 | .u.ptr.min_len = _min_len, .u.ptr.len = _len |
422e3d37 | 476 | |
fd44e385 YH |
477 | #define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0) |
478 | ||
422e3d37 JG |
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)) | |
540cd692 JG |
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) | |
c66db311 | 501 | |
d108dac0 | 502 | /* Must be used in the '...' of any UVERBS_ATTR */ |
83bb4442 JG |
503 | #define UA_ALLOC_AND_COPY .alloc_and_copy = 1 |
504 | #define UA_MANDATORY .mandatory = 1 | |
83bb4442 | 505 | #define UA_OPTIONAL .mandatory = 0 |
d108dac0 | 506 | |
70cd20ae GL |
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 | ||
4d7e8cc5 YH |
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 | ||
d108dac0 | 534 | #define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \ |
9a119cd5 | 535 | (&(const struct uverbs_attr_def){ \ |
d108dac0 JG |
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, ...) \ | |
9a119cd5 | 543 | (&(const struct uverbs_attr_def){ \ |
d108dac0 JG |
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, ...) \ | |
9a119cd5 | 553 | (&(const struct uverbs_attr_def){ \ |
d108dac0 JG |
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, ...) \ | |
9a119cd5 | 560 | (&(const struct uverbs_attr_def){ \ |
d108dac0 JG |
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, ...) \ | |
9a119cd5 | 568 | (&(const struct uverbs_attr_def){ \ |
d108dac0 JG |
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 | }) | |
35410306 | 575 | |
0953fffe MB |
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 | ||
bccd0622 JG |
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 | ||
6c61d2a5 JG |
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() \ | |
9a119cd5 | 604 | UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \ |
540cd692 | 605 | UVERBS_ATTR_MIN_SIZE(0), \ |
07f05f40 JG |
606 | UA_OPTIONAL, \ |
607 | .is_udata = 1), \ | |
9a119cd5 | 608 | UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \ |
540cd692 | 609 | UVERBS_ATTR_MIN_SIZE(0), \ |
07f05f40 JG |
610 | UA_OPTIONAL, \ |
611 | .is_udata = 1) | |
6c61d2a5 | 612 | |
fac9658c MB |
613 | /* ================================================= |
614 | * Parsing infrastructure | |
615 | * ================================================= | |
616 | */ | |
617 | ||
3a863577 | 618 | |
fac9658c | 619 | struct uverbs_ptr_attr { |
8762d149 MB |
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 | }; | |
fac9658c | 628 | u16 len; |
6a1f444f | 629 | u16 uattr_idx; |
494c5580 | 630 | u8 enum_id; |
fac9658c MB |
631 | }; |
632 | ||
f43dbebf MB |
633 | struct uverbs_obj_attr { |
634 | struct ib_uobject *uobject; | |
3a863577 | 635 | const struct uverbs_api_attr *attr_elm; |
f43dbebf MB |
636 | }; |
637 | ||
70cd20ae GL |
638 | struct uverbs_objs_arr_attr { |
639 | struct ib_uobject **uobjects; | |
640 | u16 len; | |
641 | }; | |
642 | ||
f43dbebf | 643 | struct uverbs_attr { |
fac9658c MB |
644 | union { |
645 | struct uverbs_ptr_attr ptr_attr; | |
646 | struct uverbs_obj_attr obj_attr; | |
70cd20ae | 647 | struct uverbs_objs_arr_attr objs_arr_attr; |
fac9658c | 648 | }; |
f43dbebf MB |
649 | }; |
650 | ||
f43dbebf | 651 | struct uverbs_attr_bundle { |
ef87df2c | 652 | struct ib_udata driver_udata; |
c2a939fd | 653 | struct ib_udata ucore; |
4b3dd2bb | 654 | struct ib_uverbs_file *ufile; |
3d9dfd06 | 655 | struct ib_ucontext *context; |
3a863577 JG |
656 | DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN); |
657 | struct uverbs_attr attrs[]; | |
f43dbebf MB |
658 | }; |
659 | ||
35410306 MB |
660 | static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle, |
661 | unsigned int idx) | |
662 | { | |
3a863577 JG |
663 | return test_bit(uapi_bkey_attr(uapi_key_attr(idx)), |
664 | attrs_bundle->attr_present); | |
35410306 MB |
665 | } |
666 | ||
730623f4 SR |
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 | ||
41b2a71f MB |
684 | #define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT) |
685 | ||
d70724f1 MB |
686 | static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle, |
687 | u16 idx) | |
688 | { | |
d70724f1 MB |
689 | if (!uverbs_attr_is_valid(attrs_bundle, idx)) |
690 | return ERR_PTR(-ENOENT); | |
691 | ||
3a863577 | 692 | return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))]; |
d70724f1 MB |
693 | } |
694 | ||
494c5580 MB |
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 | ||
be934cca AL |
706 | static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle, |
707 | u16 idx) | |
708 | { | |
f4602cbb | 709 | const struct uverbs_attr *attr; |
be934cca | 710 | |
f4602cbb JG |
711 | attr = uverbs_attr_get(attrs_bundle, idx); |
712 | if (IS_ERR(attr)) | |
713 | return ERR_CAST(attr); | |
be934cca | 714 | |
f4602cbb | 715 | return attr->obj_attr.uobject->object; |
be934cca AL |
716 | } |
717 | ||
3efa3812 MB |
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 | ||
8762d149 MB |
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 | ||
cbfdd442 MS |
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 | ||
70cd20ae GL |
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 | ||
89d9e8d3 MB |
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 | ||
8762d149 MB |
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 | ||
89d9e8d3 | 804 | static inline int _uverbs_copy_from(void *to, |
d70724f1 | 805 | const struct uverbs_attr_bundle *attrs_bundle, |
89d9e8d3 MB |
806 | size_t idx, |
807 | size_t size) | |
d70724f1 MB |
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 | ||
89d9e8d3 MB |
814 | /* |
815 | * Validation ensures attr->ptr_attr.len >= size. If the caller is | |
c66db311 MB |
816 | * using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call |
817 | * uverbs_copy_from_or_zero. | |
89d9e8d3 MB |
818 | */ |
819 | if (unlikely(size < attr->ptr_attr.len)) | |
820 | return -EINVAL; | |
821 | ||
822 | if (uverbs_attr_ptr_is_inline(attr)) | |
d70724f1 | 823 | memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len); |
2f36028c JG |
824 | else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data), |
825 | attr->ptr_attr.len)) | |
d70724f1 MB |
826 | return -EFAULT; |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
c66db311 MB |
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 | ||
d70724f1 | 856 | #define uverbs_copy_from(to, attrs_bundle, idx) \ |
89d9e8d3 | 857 | _uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to)) |
d70724f1 | 858 | |
c66db311 MB |
859 | #define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \ |
860 | _uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to)) | |
861 | ||
8313c10f JG |
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 | ||
bccd0622 JG |
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); | |
6a1f444f JG |
873 | int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx, |
874 | const void *from, size_t size); | |
461bb2ee JG |
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 | } | |
0953fffe MB |
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); | |
2e8039c6 MG |
892 | int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, |
893 | size_t idx, const void *from, size_t size); | |
bccd0622 JG |
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 | } | |
6a1f444f JG |
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 | } | |
461bb2ee JG |
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 | } | |
0953fffe MB |
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 | } | |
2e8039c6 MG |
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 | } | |
bccd0622 JG |
935 | #endif |
936 | ||
0953fffe MB |
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 | }) | |
118620d3 | 958 | #endif |