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
85 /* Current known size to kernel */
87 /* User isn't allowed to provide something < min_len */
93 * higher bits mean the namespace and lower bits mean
94 * the type id within the namespace.
105 /* This weird split lets us remove some padding */
109 * The enum attribute can select one of the attributes
110 * contained in the ids array. Currently only PTR_IN
111 * attributes are supported in the ids array.
113 const struct uverbs_attr_spec *ids;
118 * higher bits mean the namespace and lower bits mean
119 * the type id within the namespace.
130 * Information about the API is loaded into a radix tree. For IOCTL we start
132 * object_id, attr_id, method_id
134 * Which is a 48 bit value, with most of the bits guaranteed to be zero. Based
135 * on the current kernel support this is compressed into 16 bit key for the
136 * radix tree. Since this compression is entirely internal to the kernel the
137 * below limits can be revised if the kernel gains additional data.
139 * With 64 leafs per node this is a 3 level radix tree.
141 * The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns
142 * the object slot, and OBJ_ID,METH_ID,0 and returns the method slot.
144 enum uapi_radix_data {
145 UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT,
147 UVERBS_API_ATTR_KEY_BITS = 6,
148 UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0),
149 UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1,
151 UVERBS_API_METHOD_KEY_BITS = 5,
152 UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS,
153 UVERBS_API_METHOD_KEY_NUM_CORE = 24,
154 UVERBS_API_METHOD_KEY_NUM_DRIVER = (1 << UVERBS_API_METHOD_KEY_BITS) -
155 UVERBS_API_METHOD_KEY_NUM_CORE,
156 UVERBS_API_METHOD_KEY_MASK = GENMASK(
157 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1,
158 UVERBS_API_METHOD_KEY_SHIFT),
160 UVERBS_API_OBJ_KEY_BITS = 5,
161 UVERBS_API_OBJ_KEY_SHIFT =
162 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT,
163 UVERBS_API_OBJ_KEY_NUM_CORE = 24,
164 UVERBS_API_OBJ_KEY_NUM_DRIVER =
165 (1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE,
166 UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT),
168 /* This id guaranteed to not exist in the radix tree */
169 UVERBS_API_KEY_ERR = 0xFFFFFFFF,
172 static inline __attribute_const__ u32 uapi_key_obj(u32 id)
174 if (id & UVERBS_API_NS_FLAG) {
175 id &= ~UVERBS_API_NS_FLAG;
176 if (id >= UVERBS_API_OBJ_KEY_NUM_DRIVER)
177 return UVERBS_API_KEY_ERR;
178 id = id + UVERBS_API_OBJ_KEY_NUM_CORE;
180 if (id >= UVERBS_API_OBJ_KEY_NUM_CORE)
181 return UVERBS_API_KEY_ERR;
184 return id << UVERBS_API_OBJ_KEY_SHIFT;
187 static inline __attribute_const__ bool uapi_key_is_object(u32 key)
189 return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0;
192 static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id)
194 if (id & UVERBS_API_NS_FLAG) {
195 id &= ~UVERBS_API_NS_FLAG;
196 if (id >= UVERBS_API_METHOD_KEY_NUM_DRIVER)
197 return UVERBS_API_KEY_ERR;
198 id = id + UVERBS_API_METHOD_KEY_NUM_CORE;
201 if (id >= UVERBS_API_METHOD_KEY_NUM_CORE)
202 return UVERBS_API_KEY_ERR;
205 return id << UVERBS_API_METHOD_KEY_SHIFT;
208 static inline __attribute_const__ u32 uapi_key_attr_to_method(u32 attr_key)
211 (UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK);
214 static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key)
216 return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
217 (key & UVERBS_API_ATTR_KEY_MASK) == 0;
220 static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key)
222 /* 0 is the method slot itself */
223 return ioctl_method_key + 1;
226 static inline __attribute_const__ u32 uapi_key_attr(u32 id)
229 * The attr is designed to fit in the typical single radix tree node
230 * of 64 entries. Since allmost all methods have driver attributes we
231 * organize things so that the driver and core attributes interleave to
232 * reduce the length of the attributes array in typical cases.
234 if (id & UVERBS_API_NS_FLAG) {
235 id &= ~UVERBS_API_NS_FLAG;
237 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
238 return UVERBS_API_KEY_ERR;
241 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
242 return UVERBS_API_KEY_ERR;
249 static inline __attribute_const__ bool uapi_key_is_attr(u32 key)
251 return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
252 (key & UVERBS_API_ATTR_KEY_MASK) != 0;
256 * This returns a value in the range [0 to UVERBS_API_ATTR_BKEY_LEN),
257 * basically it undoes the reservation of 0 in the ID numbering. attr_key
258 * must already be masked with UVERBS_API_ATTR_KEY_MASK, or be the output of
261 static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
266 static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey)
268 return attr_bkey + 1;
272 * =======================================
274 * =======================================
277 struct uverbs_attr_def {
279 struct uverbs_attr_spec attr;
282 struct uverbs_method_def {
284 /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
287 const struct uverbs_attr_def * const (*attrs)[];
288 int (*handler)(struct ib_uverbs_file *ufile,
289 struct uverbs_attr_bundle *ctx);
292 struct uverbs_object_def {
294 const struct uverbs_obj_type *type_attrs;
296 const struct uverbs_method_def * const (*methods)[];
299 enum uapi_definition_kind {
301 UAPI_DEF_CHAIN_OBJ_TREE,
305 struct uapi_definition {
314 const struct uapi_definition *chain;
315 const struct uverbs_object_def *chain_obj_tree;
319 /* Include another struct uapi_definition in this one */
320 #define UAPI_DEF_CHAIN(_def_var) \
322 .kind = UAPI_DEF_CHAIN, .chain = _def_var, \
325 /* Temporary until the tree base description is replaced */
326 #define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr) \
328 .kind = UAPI_DEF_CHAIN_OBJ_TREE, \
329 .object_start = { .object_id = _object_enum }, \
330 .chain_obj_tree = _object_ptr, \
332 #define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \
333 UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum)), \
337 * =======================================
338 * Attribute Specifications
339 * =======================================
342 #define UVERBS_ATTR_SIZE(_min_len, _len) \
343 .u.ptr.min_len = _min_len, .u.ptr.len = _len
345 #define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0)
348 * Specifies a uapi structure that cannot be extended. The user must always
349 * supply the whole structure and nothing more. The structure must be declared
350 * in a header under include/uapi/rdma.
352 #define UVERBS_ATTR_TYPE(_type) \
353 .u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type)
355 * Specifies a uapi structure where the user must provide at least up to
356 * member 'last'. Anything after last and up until the end of the structure
357 * can be non-zero, anything longer than the end of the structure must be
358 * zero. The structure must be declared in a header under include/uapi/rdma.
360 #define UVERBS_ATTR_STRUCT(_type, _last) \
361 .zero_trailing = 1, \
362 UVERBS_ATTR_SIZE(((uintptr_t)(&((_type *)0)->_last + 1)), \
365 * Specifies at least min_len bytes must be passed in, but the amount can be
366 * larger, up to the protocol maximum size. No check for zeroing is done.
368 #define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX)
370 /* Must be used in the '...' of any UVERBS_ATTR */
371 #define UA_ALLOC_AND_COPY .alloc_and_copy = 1
372 #define UA_MANDATORY .mandatory = 1
373 #define UA_OPTIONAL .mandatory = 0
376 * min_len must be bigger than 0 and _max_len must be smaller than 4095. Only
377 * READ\WRITE accesses are supported.
379 #define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \
381 (&(const struct uverbs_attr_def){ \
383 BUILD_BUG_ON_ZERO((_min_len) == 0 || \
385 PAGE_SIZE / sizeof(void *) || \
386 (_min_len) > (_max_len) || \
387 (_access) == UVERBS_ACCESS_NEW || \
388 (_access) == UVERBS_ACCESS_DESTROY), \
389 .attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY, \
390 .u2.objs_arr.obj_type = _idr_type, \
391 .u2.objs_arr.access = _access, \
392 .u2.objs_arr.min_len = _min_len, \
393 .u2.objs_arr.max_len = _max_len, \
396 #define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \
397 (&(const struct uverbs_attr_def){ \
399 .attr = { .type = UVERBS_ATTR_TYPE_IDR, \
400 .u.obj.obj_type = _idr_type, \
401 .u.obj.access = _access, \
404 #define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \
405 (&(const struct uverbs_attr_def){ \
407 BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \
408 (_access) != UVERBS_ACCESS_READ), \
409 .attr = { .type = UVERBS_ATTR_TYPE_FD, \
410 .u.obj.obj_type = _fd_type, \
411 .u.obj.access = _access, \
414 #define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \
415 (&(const struct uverbs_attr_def){ \
417 .attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \
421 #define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \
422 (&(const struct uverbs_attr_def){ \
424 .attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \
428 /* _enum_arry should be a 'static const union uverbs_attr_spec[]' */
429 #define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \
430 (&(const struct uverbs_attr_def){ \
432 .attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \
433 .u2.enum_def.ids = _enum_arr, \
434 .u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \
438 /* An input value that is a member in the enum _enum_type. */
439 #define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...) \
440 UVERBS_ATTR_PTR_IN( \
443 sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \
448 * An input value that is a bitwise combination of values of _enum_type.
449 * This permits the flag value to be passed as either a u32 or u64, it must
450 * be retrieved via uverbs_get_flag().
452 #define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \
453 UVERBS_ATTR_PTR_IN( \
455 UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \
456 !sizeof(_enum_type *)), \
461 * This spec is used in order to pass information to the hardware driver in a
462 * legacy way. Every verb that could get driver specific data should get this
465 #define UVERBS_ATTR_UHW() \
466 UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \
467 UVERBS_ATTR_MIN_SIZE(0), \
469 UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \
470 UVERBS_ATTR_MIN_SIZE(0), \
473 /* =================================================
474 * Parsing infrastructure
475 * =================================================
479 struct uverbs_ptr_attr {
481 * If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is
493 struct uverbs_obj_attr {
494 struct ib_uobject *uobject;
495 const struct uverbs_api_attr *attr_elm;
498 struct uverbs_objs_arr_attr {
499 struct ib_uobject **uobjects;
505 struct uverbs_ptr_attr ptr_attr;
506 struct uverbs_obj_attr obj_attr;
507 struct uverbs_objs_arr_attr objs_arr_attr;
511 struct uverbs_attr_bundle {
512 struct ib_uverbs_file *ufile;
513 DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
514 struct uverbs_attr attrs[];
517 static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
520 return test_bit(uapi_bkey_attr(uapi_key_attr(idx)),
521 attrs_bundle->attr_present);
524 #define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
526 static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
529 if (!uverbs_attr_is_valid(attrs_bundle, idx))
530 return ERR_PTR(-ENOENT);
532 return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))];
535 static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle,
538 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
541 return PTR_ERR(attr);
543 return attr->ptr_attr.enum_id;
546 static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle,
549 const struct uverbs_attr *attr;
551 attr = uverbs_attr_get(attrs_bundle, idx);
553 return ERR_CAST(attr);
555 return attr->obj_attr.uobject->object;
558 static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle,
561 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
564 return ERR_CAST(attr);
566 return attr->obj_attr.uobject;
570 uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
572 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
575 return PTR_ERR(attr);
577 return attr->ptr_attr.len;
581 * uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for
582 * UVERBS_ATTR_TYPE_IDRS_ARRAY.
583 * @arr: Returned pointer to array of pointers for uobjects or NULL if
584 * the attribute isn't provided.
586 * Return: The array length or 0 if no attribute was provided.
588 static inline int uverbs_attr_get_uobjs_arr(
589 const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx,
590 struct ib_uobject ***arr)
592 const struct uverbs_attr *attr =
593 uverbs_attr_get(attrs_bundle, attr_idx);
600 *arr = attr->objs_arr_attr.uobjects;
602 return attr->objs_arr_attr.len;
605 static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
607 return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
610 static inline void *uverbs_attr_get_alloced_ptr(
611 const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
613 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
618 return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data :
622 static inline int _uverbs_copy_from(void *to,
623 const struct uverbs_attr_bundle *attrs_bundle,
627 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
630 return PTR_ERR(attr);
633 * Validation ensures attr->ptr_attr.len >= size. If the caller is
634 * using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call
635 * uverbs_copy_from_or_zero.
637 if (unlikely(size < attr->ptr_attr.len))
640 if (uverbs_attr_ptr_is_inline(attr))
641 memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len);
642 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data),
649 static inline int _uverbs_copy_from_or_zero(void *to,
650 const struct uverbs_attr_bundle *attrs_bundle,
654 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
658 return PTR_ERR(attr);
660 min_size = min_t(size_t, size, attr->ptr_attr.len);
662 if (uverbs_attr_ptr_is_inline(attr))
663 memcpy(to, &attr->ptr_attr.data, min_size);
664 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data),
669 memset(to + min_size, 0, size - min_size);
674 #define uverbs_copy_from(to, attrs_bundle, idx) \
675 _uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to))
677 #define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \
678 _uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to))
680 #if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
681 int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
682 size_t idx, u64 allowed_bits);
683 int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
684 size_t idx, u64 allowed_bits);
685 int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx,
686 const void *from, size_t size);
687 __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size,
690 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
693 return _uverbs_alloc(bundle, size, GFP_KERNEL);
696 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
699 return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO);
701 int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
702 size_t idx, s64 lower_bound, u64 upper_bound,
706 uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
707 size_t idx, u64 allowed_bits)
712 uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
713 size_t idx, u64 allowed_bits)
717 static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
718 size_t idx, const void *from, size_t size)
722 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
725 return ERR_PTR(-EINVAL);
727 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
730 return ERR_PTR(-EINVAL);
733 _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
734 size_t idx, s64 lower_bound, u64 upper_bound,
741 #define uverbs_get_const(_to, _attrs_bundle, _idx) \
744 int _ret = _uverbs_get_const(&_val, _attrs_bundle, _idx, \
745 type_min(typeof(*_to)), \
746 type_max(typeof(*_to)), NULL); \
751 #define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \
754 s64 _def_val = _default; \
756 _uverbs_get_const(&_val, _attrs_bundle, _idx, \
757 type_min(typeof(*_to)), \
758 type_max(typeof(*_to)), &_def_val); \