2 * Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
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33 #ifndef _UVERBS_IOCTL_
34 #define _UVERBS_IOCTL_
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>
43 * =======================================
44 * Verbs action specifications
45 * =======================================
48 enum uverbs_attr_type {
50 UVERBS_ATTR_TYPE_PTR_IN,
51 UVERBS_ATTR_TYPE_PTR_OUT,
54 UVERBS_ATTR_TYPE_ENUM_IN,
55 UVERBS_ATTR_TYPE_IDRS_ARRAY,
58 enum uverbs_obj_access {
65 /* Specification of a single attribute inside the ioctl message */
67 struct uverbs_attr_spec {
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
77 * Valid only for PTR_IN. Allocate and copy the data inside
82 /* True if this is from UVERBS_ATTR_UHW */
87 /* Current known size to kernel */
89 /* User isn't allowed to provide something < min_len */
95 * higher bits mean the namespace and lower bits mean
96 * the type id within the namespace.
107 /* This weird split lets us remove some padding */
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.
115 const struct uverbs_attr_spec *ids;
120 * higher bits mean the namespace and lower bits mean
121 * the type id within the namespace.
132 * Information about the API is loaded into a radix tree. For IOCTL we start
134 * object_id, attr_id, method_id
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.
141 * With 64 leafs per node this is a 3 level radix tree.
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.
146 * This also encodes the tables for the write() and write() extended commands
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
153 enum uapi_radix_data {
154 UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT,
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,
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),
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),
181 /* This id guaranteed to not exist in the radix tree */
182 UVERBS_API_KEY_ERR = 0xFFFFFFFF,
185 static inline __attribute_const__ u32 uapi_key_obj(u32 id)
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;
193 if (id >= UVERBS_API_OBJ_KEY_NUM_CORE)
194 return UVERBS_API_KEY_ERR;
197 return id << UVERBS_API_OBJ_KEY_SHIFT;
200 static inline __attribute_const__ bool uapi_key_is_object(u32 key)
202 return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0;
205 static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id)
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;
214 if (id >= UVERBS_API_METHOD_KEY_NUM_CORE)
215 return UVERBS_API_KEY_ERR;
218 return id << UVERBS_API_METHOD_KEY_SHIFT;
221 static inline __attribute_const__ u32 uapi_key_write_method(u32 id)
223 if (id >= UVERBS_API_WRITE_KEY_NUM)
224 return UVERBS_API_KEY_ERR;
225 return UVERBS_API_METHOD_IS_WRITE | id;
228 static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id)
230 if (id >= UVERBS_API_WRITE_KEY_NUM)
231 return UVERBS_API_KEY_ERR;
232 return UVERBS_API_METHOD_IS_WRITE_EX | id;
235 static inline __attribute_const__ u32
236 uapi_key_attr_to_ioctl_method(u32 attr_key)
239 (UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK);
242 static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key)
244 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
246 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
247 (key & UVERBS_API_ATTR_KEY_MASK) == 0;
250 static inline __attribute_const__ bool uapi_key_is_write_method(u32 key)
252 return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE;
255 static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key)
257 return (key & UVERBS_API_METHOD_KEY_MASK) ==
258 UVERBS_API_METHOD_IS_WRITE_EX;
261 static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key)
263 /* 0 is the method slot itself */
264 return ioctl_method_key + 1;
267 static inline __attribute_const__ u32 uapi_key_attr(u32 id)
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.
275 if (id & UVERBS_API_NS_FLAG) {
276 id &= ~UVERBS_API_NS_FLAG;
278 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
279 return UVERBS_API_KEY_ERR;
282 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
283 return UVERBS_API_KEY_ERR;
290 /* Only true for ioctl methods */
291 static inline __attribute_const__ bool uapi_key_is_attr(u32 key)
293 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
295 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
296 (key & UVERBS_API_ATTR_KEY_MASK) != 0;
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
305 static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
310 static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey)
312 return attr_bkey + 1;
316 * =======================================
318 * =======================================
321 struct uverbs_attr_def {
323 struct uverbs_attr_spec attr;
326 struct uverbs_method_def {
328 /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
331 const struct uverbs_attr_def * const (*attrs)[];
332 int (*handler)(struct uverbs_attr_bundle *attrs);
335 struct uverbs_object_def {
337 const struct uverbs_obj_type *type_attrs;
339 const struct uverbs_method_def * const (*methods)[];
342 enum uapi_definition_kind {
344 UAPI_DEF_OBJECT_START,
346 UAPI_DEF_CHAIN_OBJ_TREE,
348 UAPI_DEF_IS_SUPPORTED_FUNC,
349 UAPI_DEF_IS_SUPPORTED_DEV_FN,
352 enum uapi_definition_scope {
353 UAPI_SCOPE_OBJECT = 1,
354 UAPI_SCOPE_METHOD = 2,
357 struct uapi_definition {
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;
383 /* Define things connected to object_id */
384 #define DECLARE_UVERBS_OBJECT(_object_id, ...) \
386 .kind = UAPI_DEF_OBJECT_START, \
387 .object_start = { .object_id = _object_id }, \
391 /* Use in a var_args of DECLARE_UVERBS_OBJECT */
392 #define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \
394 .kind = UAPI_DEF_WRITE, \
395 .scope = UAPI_SCOPE_OBJECT, \
396 .write = { .is_ex = 0, .command_num = _command_num }, \
397 .func_write = _func, \
402 /* Use in a var_args of DECLARE_UVERBS_OBJECT */
403 #define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \
405 .kind = UAPI_DEF_WRITE, \
406 .scope = UAPI_SCOPE_OBJECT, \
407 .write = { .is_ex = 1, .command_num = _command_num }, \
408 .func_write = _func, \
414 * Object is only supported if the function pointer named ibdev_fn in struct
415 * ib_device is not NULL.
417 #define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \
419 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
420 .scope = UAPI_SCOPE_OBJECT, \
422 offsetof(struct ib_device_ops, ibdev_fn) + \
424 sizeof(((struct ib_device_ops *)0)->ibdev_fn) != \
429 * Method is only supported if the function pointer named ibdev_fn in struct
430 * ib_device is not NULL.
432 #define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn) \
434 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
435 .scope = UAPI_SCOPE_METHOD, \
437 offsetof(struct ib_device_ops, ibdev_fn) + \
439 sizeof(((struct ib_device_ops *)0)->ibdev_fn) != \
443 /* Call a function to determine if the entire object is supported or not */
444 #define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \
446 .kind = UAPI_DEF_IS_SUPPORTED_FUNC, \
447 .scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \
450 /* Include another struct uapi_definition in this one */
451 #define UAPI_DEF_CHAIN(_def_var) \
453 .kind = UAPI_DEF_CHAIN, .chain = _def_var, \
456 /* Temporary until the tree base description is replaced */
457 #define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...) \
459 .kind = UAPI_DEF_CHAIN_OBJ_TREE, \
460 .object_start = { .object_id = _object_enum }, \
461 .chain_obj_tree = _object_ptr, \
464 #define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \
465 UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum), \
469 * =======================================
470 * Attribute Specifications
471 * =======================================
474 #define UVERBS_ATTR_SIZE(_min_len, _len) \
475 .u.ptr.min_len = _min_len, .u.ptr.len = _len
477 #define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0)
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.
484 #define UVERBS_ATTR_TYPE(_type) \
485 .u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type)
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.
492 #define UVERBS_ATTR_STRUCT(_type, _last) \
493 .zero_trailing = 1, \
494 UVERBS_ATTR_SIZE(((uintptr_t)(&((_type *)0)->_last + 1)), \
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.
500 #define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX)
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
508 * min_len must be bigger than 0 and _max_len must be smaller than 4095. Only
509 * READ\WRITE accesses are supported.
511 #define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \
513 (&(const struct uverbs_attr_def){ \
515 BUILD_BUG_ON_ZERO((_min_len) == 0 || \
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, \
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.
532 #define UVERBS_IDR_ANY_OBJECT 0xFFFF
534 #define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \
535 (&(const struct uverbs_attr_def){ \
537 .attr = { .type = UVERBS_ATTR_TYPE_IDR, \
538 .u.obj.obj_type = _idr_type, \
539 .u.obj.access = _access, \
542 #define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \
543 (&(const struct uverbs_attr_def){ \
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, \
552 #define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \
553 (&(const struct uverbs_attr_def){ \
555 .attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \
559 #define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \
560 (&(const struct uverbs_attr_def){ \
562 .attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \
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){ \
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), \
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( \
581 sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \
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().
590 #define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \
591 UVERBS_ATTR_PTR_IN( \
593 UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \
594 !sizeof(_enum_type *)), \
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
603 #define UVERBS_ATTR_UHW() \
604 UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \
605 UVERBS_ATTR_MIN_SIZE(0), \
608 UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \
609 UVERBS_ATTR_MIN_SIZE(0), \
613 /* =================================================
614 * Parsing infrastructure
615 * =================================================
619 struct uverbs_ptr_attr {
621 * If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is
633 struct uverbs_obj_attr {
634 struct ib_uobject *uobject;
635 const struct uverbs_api_attr *attr_elm;
638 struct uverbs_objs_arr_attr {
639 struct ib_uobject **uobjects;
645 struct uverbs_ptr_attr ptr_attr;
646 struct uverbs_obj_attr obj_attr;
647 struct uverbs_objs_arr_attr objs_arr_attr;
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[];
660 static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
663 return test_bit(uapi_bkey_attr(uapi_key_attr(idx)),
664 attrs_bundle->attr_present);
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.
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
677 #define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
678 (udata ? container_of(container_of(udata, struct uverbs_attr_bundle, \
681 drv_dev_struct, member) : \
682 (drv_dev_struct *)NULL)
684 #define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
686 static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
689 if (!uverbs_attr_is_valid(attrs_bundle, idx))
690 return ERR_PTR(-ENOENT);
692 return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))];
695 static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle,
698 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
701 return PTR_ERR(attr);
703 return attr->ptr_attr.enum_id;
706 static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle,
709 const struct uverbs_attr *attr;
711 attr = uverbs_attr_get(attrs_bundle, idx);
713 return ERR_CAST(attr);
715 return attr->obj_attr.uobject->object;
718 static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle,
721 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
724 return ERR_CAST(attr);
726 return attr->obj_attr.uobject;
730 uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
732 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
735 return PTR_ERR(attr);
737 return attr->ptr_attr.len;
741 * uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr
743 * @attrs: The attribute bundle
744 * @idx: The ID of the attribute
745 * @elem_size: The size of the element in the array
748 uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx,
751 int size = uverbs_attr_get_len(attrs, idx);
756 if (size % elem_size)
759 return size / elem_size;
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.
768 * Return: The array length or 0 if no attribute was provided.
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)
774 const struct uverbs_attr *attr =
775 uverbs_attr_get(attrs_bundle, attr_idx);
782 *arr = attr->objs_arr_attr.uobjects;
784 return attr->objs_arr_attr.len;
787 static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
789 return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
792 static inline void *uverbs_attr_get_alloced_ptr(
793 const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
795 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
800 return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data :
804 static inline int _uverbs_copy_from(void *to,
805 const struct uverbs_attr_bundle *attrs_bundle,
809 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
812 return PTR_ERR(attr);
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.
819 if (unlikely(size < attr->ptr_attr.len))
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),
831 static inline int _uverbs_copy_from_or_zero(void *to,
832 const struct uverbs_attr_bundle *attrs_bundle,
836 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
840 return PTR_ERR(attr);
842 min_size = min_t(size_t, size, attr->ptr_attr.len);
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),
851 memset(to + min_size, 0, size - min_size);
856 #define uverbs_copy_from(to, attrs_bundle, idx) \
857 _uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to))
859 #define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \
860 _uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to))
862 static inline struct ib_ucontext *
863 ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs)
865 return ib_uverbs_get_ucontext_file(attrs->ufile);
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,
878 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
881 return _uverbs_alloc(bundle, size, GFP_KERNEL);
884 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
887 return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO);
889 int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
890 size_t idx, s64 lower_bound, u64 upper_bound,
892 int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
893 size_t idx, const void *from, size_t size);
896 uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
897 size_t idx, u64 allowed_bits)
902 uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
903 size_t idx, u64 allowed_bits)
907 static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
908 size_t idx, const void *from, size_t size)
912 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
915 return ERR_PTR(-EINVAL);
917 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
920 return ERR_PTR(-EINVAL);
923 _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
924 size_t idx, s64 lower_bound, u64 upper_bound,
930 uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
931 size_t idx, const void *from, size_t size)
937 #define uverbs_get_const(_to, _attrs_bundle, _idx) \
940 int _ret = _uverbs_get_const(&_val, _attrs_bundle, _idx, \
941 type_min(typeof(*_to)), \
942 type_max(typeof(*_to)), NULL); \
947 #define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \
950 s64 _def_val = _default; \
952 _uverbs_get_const(&_val, _attrs_bundle, _idx, \
953 type_min(typeof(*_to)), \
954 type_max(typeof(*_to)), &_def_val); \